gnunet-gns-proxy.c File Reference

#include "platform.h"
#include <microhttpd.h>
#include "gnunet_curl_lib.h"
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include <gnutls/abstract.h>
#include <gnutls/crypto.h>
#include <regex.h>
#include "gnunet_util_lib.h"
#include "gnunet_gns_service.h"
#include "gnunet_identity_service.h"
#include "gns.h"
#include "gnunet_mhd_compat.h"

Include dependency graph for gnunet-gns-proxy.c:

Go to the source code of this file.

Data Structures
struct	Socks5ClientHelloMessage
	Client hello in Socks5 protocol. More...
struct	Socks5ServerHelloMessage
	Server hello in Socks5 protocol. More...
struct	Socks5ClientRequestMessage
	Client socks request in Socks5 protocol. More...
struct	Socks5ServerResponseMessage
	Server response to client requests in Socks5 protocol. More...
struct	ProxyCA
	A structure for CA cert/key. More...
struct	ProxyGNSCertificate
	Structure for GNS certificates. More...
struct	MhdHttpList
	A structure for all running Httpds. More...
struct	HttpResponseHeader
	A header list. More...
struct	Socks5Request
	A structure for socks requests. More...

Macros
#define	GNUNET_GNS_PROXY_PORT   7777
	Default Socks5 listen port. More...
#define	MAX_HTTP_URI_LENGTH   2048
	Maximum supported length for a URI. More...
#define	MAX_DANES   32
	Maximum number of DANE records we support per domain name (and port and protocol). More...
#define	IO_BUFFERSIZE   CURL_MAX_WRITE_SIZE
	Size of the buffer for the data upload / download. More...
#define	SOCKS_BUFFERSIZE   (256 + 32)
	Size of the read/write buffers for Socks. More...
#define	HTTP_PORT   80
	Port for plaintext HTTP. More...
#define	HTTPS_PORT   443
	Port for HTTPS. More...
#define	MAX_PEM_SIZE   (10 * 1024)
	Largest allowed size for a PEM certificate. More...
#define	MHD_CACHE_TIMEOUT
	After how long do we clean up unused MHD TLS instances? More...
#define	HTTP_HANDSHAKE_TIMEOUT
	After how long do we clean up Socks5 handles that failed to show any activity with their respective MHD instance? More...
#define	LOG_CURL_EASY(level, fun, rc)
	Log curl error. More...
#define	SOCKS_VERSION_5   0x05
	Which SOCKS version do we speak? More...
#define	SOCKS_AUTH_NONE   0
	Flag to set for 'no authentication'. More...

Enumerations
enum	Socks5Commands { SOCKS5_CMD_TCP_STREAM = 1 , SOCKS5_CMD_TCP_PORT = 2 , SOCKS5_CMD_UDP_PORT = 3 }
	Commands in Socks5. More...
enum	Socks5AddressType { SOCKS5_AT_IPV4 = 1 , SOCKS5_AT_DOMAINNAME = 3 , SOCKS5_AT_IPV6 = 4 }
	Address types in Socks5. More...
enum	Socks5StatusCode {   SOCKS5_STATUS_REQUEST_GRANTED = 0 , SOCKS5_STATUS_GENERAL_FAILURE = 1 , SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE = 2 , SOCKS5_STATUS_NETWORK_UNREACHABLE = 3 ,   SOCKS5_STATUS_HOST_UNREACHABLE = 4 , SOCKS5_STATUS_CONNECTION_REFUSED_BY_HOST = 5 , SOCKS5_STATUS_TTL_EXPIRED = 6 , SOCKS5_STATUS_COMMAND_NOT_SUPPORTED = 7 ,   SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED = 8 }
	Status codes in Socks5 response. More...
enum	SocksPhase {   SOCKS5_INIT , SOCKS5_REQUEST , SOCKS5_RESOLVING , SOCKS5_DATA_TRANSFER ,   SOCKS5_WRITE_THEN_CLEANUP , SOCKS5_SOCKET_WITH_MHD , SOCKS5_SOCKET_UPLOAD_STARTED , SOCKS5_SOCKET_UPLOAD_DONE ,   SOCKS5_SOCKET_DOWNLOAD_STARTED , SOCKS5_SOCKET_DOWNLOAD_DONE }
	The socks phases. More...

Functions
static void	run_mhd_now (struct MhdHttpList *hd)
	Run MHD now, we have extra data ready for the callback. More...
static void	cleanup_s5r (struct Socks5Request *s5r)
	Clean up s5r handles. More...
static void	curl_download_prepare ()
	Ask cURL for the select() sets and schedule cURL operations. More...
static ssize_t	mhd_content_cb (void *cls, uint64_t pos, char *buf, size_t max)
	Callback for MHD response generation. More...
static int	check_ssl_certificate (struct Socks5Request *s5r)
	Check that the website has presented us with a valid X.509 certificate. More...
static size_t	curl_check_hdr (void *buffer, size_t size, size_t nmemb, void *cls)
	We're getting an HTTP response header from cURL. More...
static int	create_mhd_response_from_s5r (struct Socks5Request *s5r)
	Create an MHD response object in s5r matching the information we got from curl. More...
static size_t	curl_download_cb (void *ptr, size_t size, size_t nmemb, void *ctx)
	Handle response payload data from cURL. More...
static size_t	curl_upload_cb (void *buf, size_t size, size_t nmemb, void *cls)
	cURL callback for uploaded (PUT/POST) data. More...
static void	curl_task_download (void *cls)
	Task that is run when we are ready to receive more data from curl. More...
static int	con_val_iter (void *cls, enum MHD_ValueKind kind, const char *key, const char *value)
	Read HTTP request header field from the request. More...
static MHD_RESULT	create_response (void *cls, struct MHD_Connection *con, const char *url, const char *meth, const char *ver, const char *upload_data, size_t *upload_data_size, void **con_cls)
	Main MHD callback for handling requests. More...
static void	mhd_completed_cb (void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe)
	Function called when MHD decides that we are done with a request. More...
static void	mhd_connection_cb (void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_ConnectionNotificationCode cnc)
	Function called when MHD connection is opened or closed. More...
static void *	mhd_log_callback (void *cls, const char *url, struct MHD_Connection *connection)
	Function called when MHD first processes an incoming connection. More...
static void	kill_httpd (struct MhdHttpList *hd)
	Kill the given MHD daemon. More...
static void	kill_httpd_task (void *cls)
	Task run whenever HTTP server is idle for too long. More...
static void	do_httpd (void *cls)
	Task run whenever HTTP server operations are pending. More...
static void	schedule_httpd (struct MhdHttpList *hd)
	Schedule MHD. More...
static void *	load_file (const char *filename, unsigned int *size)
	Read file in filename. More...
static int	load_key_from_file (gnutls_x509_privkey_t key, const char *keyfile)
	Load PEM key from file. More...
static int	load_cert_from_file (gnutls_x509_crt_t crt, const char *certfile)
	Load cert from file. More...
static struct ProxyGNSCertificate *	generate_gns_certificate (const char *name)
	Generate new certificate for specific name. More...
static void	mhd_error_log_callback (void *cls, const char *fm, va_list ap)
	Function called by MHD with errors, suppresses them all. More...
static struct MhdHttpList *	lookup_ssl_httpd (const char *domain)
	Lookup (or create) an TLS MHD instance for a particular domain. More...
static void	timeout_s5r_handshake (void *cls)
	Task run when a Socks5Request somehow fails to be associated with an MHD connection (e.g. More...
static void	setup_data_transfer (struct Socks5Request *s5r)
	We're done with the Socks5 protocol, now we need to pass the connection data through to the final destination, either direct (if the protocol might not be HTTP), or via MHD (if the port looks like it should be HTTP). More...
static void	do_write (void *cls)
	Write data from buffer to socks5 client, then continue with state machine. More...
static void	signal_socks_failure (struct Socks5Request *s5r, enum Socks5StatusCode sc)
	Return a server response message indicating a failure to the client. More...
static void	signal_socks_success (struct Socks5Request *s5r)
	Return a server response message indicating success. More...
static void	handle_gns_result (void *cls, int tld, uint32_t rd_count, const struct GNUNET_GNSRECORD_Data *rd)
	Process GNS results for target domain. More...
static void	clear_from_s5r_rbuf (struct Socks5Request *s5r, size_t len)
	Remove the first len bytes from the beginning of the read buffer. More...
static void	do_s5r_read (void *cls)
	Read data from incoming Socks5 connection. More...
static void	do_accept (void *cls)
	Accept new incoming connections. More...
static void	do_shutdown (void *cls)
	Task run on shutdown. More...
static struct GNUNET_NETWORK_Handle *	bind_v4 ()
	Create an IPv4 listen socket bound to our port. More...
static struct GNUNET_NETWORK_Handle *	bind_v6 ()
	Create an IPv6 listen socket bound to our port. More...
static void	run (void *cls, char *const *args, const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *c)
	Main function that will be run. More...
int	main (int argc, char *const *argv)
	The main function for gnunet-gns-proxy. More...

Variables
static in_addr_t	address
	The address to bind to. More...
static struct in6_addr	address6
	The IPv6 address to bind to. More...
static uint16_t	port = 7777
	The port the proxy is running on (default 7777) More...
static char *	cafile_opt
	The CA file (pem) to use for the proxy CA. More...
static struct GNUNET_NETWORK_Handle *	lsock4
	The listen socket of the proxy for IPv4. More...
static struct GNUNET_NETWORK_Handle *	lsock6
	The listen socket of the proxy for IPv6. More...
static struct GNUNET_SCHEDULER_Task *	ltask4
	The listen task ID for IPv4. More...
static struct GNUNET_SCHEDULER_Task *	ltask6
	The listen task ID for IPv6. More...
static struct GNUNET_SCHEDULER_Task *	curl_download_task
	The cURL download task (curl multi API). More...
static CURLM *	curl_multi
	The cURL multi handle. More...
static struct GNUNET_GNS_Handle *	gns_handle
	Handle to the GNS service. More...
static int	disable_v6
	Disable IPv6. More...
static struct MhdHttpList *	mhd_httpd_head
	DLL for http/https daemons. More...
static struct MhdHttpList *	mhd_httpd_tail
	DLL for http/https daemons. More...
static struct MhdHttpList *	httpd
	Daemon for HTTP (we have one per X.509 certificate, and then one for all HTTP connections; this is the one for HTTP, not HTTPS). More...
static struct Socks5Request *	s5r_head
	DLL of active socks requests. More...
static struct Socks5Request *	s5r_tail
	DLL of active socks requests. More...
static struct ProxyCA	proxy_ca
	The CA for X.509 certificate generation. More...
static struct MHD_Response *	curl_failure_response
	Response we return on cURL failures. More...
static const struct GNUNET_CONFIGURATION_Handle *	cfg
	Our configuration. More...

Macro Definition Documentation

GNUNET_GNS_PROXY_PORT

#define GNUNET_GNS_PROXY_PORT   7777

Default Socks5 listen port.

Definition at line 51 of file gnunet-gns-proxy.c.

MAX_HTTP_URI_LENGTH

#define MAX_HTTP_URI_LENGTH   2048

Maximum supported length for a URI.

Should die.

Deprecated:

Definition at line 57 of file gnunet-gns-proxy.c.

MAX_DANES

#define MAX_DANES   32

Maximum number of DANE records we support per domain name (and port and protocol).

Definition at line 63 of file gnunet-gns-proxy.c.

IO_BUFFERSIZE

#define IO_BUFFERSIZE   CURL_MAX_WRITE_SIZE

Size of the buffer for the data upload / download.

Must be enough for curl, thus CURL_MAX_WRITE_SIZE is needed here (16k).

Definition at line 69 of file gnunet-gns-proxy.c.

SOCKS_BUFFERSIZE

#define SOCKS_BUFFERSIZE   (256 + 32)

Size of the read/write buffers for Socks.

Uses 256 bytes for the hostname (at most), plus a few bytes overhead for the messages.

Definition at line 76 of file gnunet-gns-proxy.c.

HTTP_PORT

#define HTTP_PORT   80

Port for plaintext HTTP.

Definition at line 81 of file gnunet-gns-proxy.c.

HTTPS_PORT

#define HTTPS_PORT   443

Port for HTTPS.

Definition at line 86 of file gnunet-gns-proxy.c.

MAX_PEM_SIZE

#define MAX_PEM_SIZE   (10 * 1024)

Largest allowed size for a PEM certificate.

Definition at line 91 of file gnunet-gns-proxy.c.

MHD_CACHE_TIMEOUT

#define MHD_CACHE_TIMEOUT

Value:

    GNUNET_TIME_relative_multiply ( \
    GNUNET_TIME_UNIT_MINUTES, 5)

After how long do we clean up unused MHD TLS instances?

Definition at line 96 of file gnunet-gns-proxy.c.

HTTP_HANDSHAKE_TIMEOUT

#define HTTP_HANDSHAKE_TIMEOUT

Value:

    GNUNET_TIME_relative_multiply ( \
    GNUNET_TIME_UNIT_SECONDS, 15)

After how long do we clean up Socks5 handles that failed to show any activity with their respective MHD instance?

Definition at line 103 of file gnunet-gns-proxy.c.

LOG_CURL_EASY

#define LOG_CURL_EASY	(		level,
			fun,
			rc
	)

Value:

  GNUNET_log (level, \
              _ ("%s failed at %s:%d: `%s'\n"), \
              fun, \
              __FILE__, \
              __LINE__, \
              curl_easy_strerror (rc))

Log curl error.

Parameters

level	log level
fun	name of curl_easy-function that gave the error
rc	return code from curl

Definition at line 114 of file gnunet-gns-proxy.c.

SOCKS_VERSION_5

#define SOCKS_VERSION_5   0x05

Which SOCKS version do we speak?

Definition at line 128 of file gnunet-gns-proxy.c.

SOCKS_AUTH_NONE

#define SOCKS_AUTH_NONE   0

Flag to set for 'no authentication'.

Definition at line 133 of file gnunet-gns-proxy.c.

Enumeration Type Documentation

Socks5Commands

enum Socks5Commands

Commands in Socks5.

Enumerator
SOCKS5_CMD_TCP_STREAM	Establish TCP/IP stream.
SOCKS5_CMD_TCP_PORT	Establish TCP port binding.
SOCKS5_CMD_UDP_PORT	Establish UDP port binding.

Definition at line 139 of file gnunet-gns-proxy.c.

{
  SOCKS5_CMD_TCP_STREAM = 1,
 
  SOCKS5_CMD_TCP_PORT = 2,
 
  SOCKS5_CMD_UDP_PORT = 3
};

Socks5AddressType

enum Socks5AddressType

Address types in Socks5.

Enumerator
SOCKS5_AT_IPV4	IPv4 address.
SOCKS5_AT_DOMAINNAME	IPv4 address.
SOCKS5_AT_IPV6	IPv6 address.

Definition at line 161 of file gnunet-gns-proxy.c.

{
  SOCKS5_AT_IPV4 = 1,
 
  SOCKS5_AT_DOMAINNAME = 3,
 
  SOCKS5_AT_IPV6 = 4
};

Socks5StatusCode

enum Socks5StatusCode

Status codes in Socks5 response.

Enumerator
SOCKS5_STATUS_REQUEST_GRANTED
SOCKS5_STATUS_GENERAL_FAILURE
SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE
SOCKS5_STATUS_NETWORK_UNREACHABLE
SOCKS5_STATUS_HOST_UNREACHABLE
SOCKS5_STATUS_CONNECTION_REFUSED_BY_HOST
SOCKS5_STATUS_TTL_EXPIRED
SOCKS5_STATUS_COMMAND_NOT_SUPPORTED
SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED

Definition at line 183 of file gnunet-gns-proxy.c.

{
  SOCKS5_STATUS_REQUEST_GRANTED = 0,
  SOCKS5_STATUS_GENERAL_FAILURE = 1,
  SOCKS5_STATUS_CONNECTION_NOT_ALLOWED_BY_RULE = 2,
  SOCKS5_STATUS_NETWORK_UNREACHABLE = 3,
  SOCKS5_STATUS_HOST_UNREACHABLE = 4,
  SOCKS5_STATUS_CONNECTION_REFUSED_BY_HOST = 5,
  SOCKS5_STATUS_TTL_EXPIRED = 6,
  SOCKS5_STATUS_COMMAND_NOT_SUPPORTED = 7,
  SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED = 8
};

SocksPhase

enum SocksPhase

The socks phases.

Enumerator
SOCKS5_INIT	We're waiting to get the client hello.
SOCKS5_REQUEST	We're waiting to get the initial request.
SOCKS5_RESOLVING	We are currently resolving the destination.
SOCKS5_DATA_TRANSFER	We're in transfer mode.
SOCKS5_WRITE_THEN_CLEANUP	Finish writing the write buffer, then clean up.
SOCKS5_SOCKET_WITH_MHD	Socket has been passed to MHD, do not close it anymore.
SOCKS5_SOCKET_UPLOAD_STARTED	We've started receiving upload data from MHD.
SOCKS5_SOCKET_UPLOAD_DONE	We've finished receiving upload data from MHD.
SOCKS5_SOCKET_DOWNLOAD_STARTED	We've finished uploading data via CURL and can now download.
SOCKS5_SOCKET_DOWNLOAD_DONE	We've finished receiving download data from cURL.

Definition at line 384 of file gnunet-gns-proxy.c.

{
  SOCKS5_INIT,
 
  SOCKS5_REQUEST,
 
  SOCKS5_RESOLVING,
 
  SOCKS5_DATA_TRANSFER,
 
  SOCKS5_WRITE_THEN_CLEANUP,
 
  SOCKS5_SOCKET_WITH_MHD,
 
  SOCKS5_SOCKET_UPLOAD_STARTED,
 
  SOCKS5_SOCKET_UPLOAD_DONE,
 
  SOCKS5_SOCKET_DOWNLOAD_STARTED,
 
  SOCKS5_SOCKET_DOWNLOAD_DONE
};

Function Documentation

run_mhd_now()

static void run_mhd_now ( struct MhdHttpList *  hd )

static

Run MHD now, we have extra data ready for the callback.

Parameters

hd	the daemon to run now.

Definition at line 2586 of file gnunet-gns-proxy.c.

{
  if (NULL != hd->httpd_task)
    GNUNET_SCHEDULER_cancel (hd->httpd_task);
  hd->httpd_task = GNUNET_SCHEDULER_add_now (&do_httpd,
                                             hd);
}

References do_httpd(), GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), and MhdHttpList::httpd_task.

Referenced by create_response(), curl_download_cb(), curl_task_download(), and curl_upload_cb().

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cleanup_s5r()

static void cleanup_s5r ( struct Socks5Request *  s5r )

static

Clean up s5r handles.

Parameters

s5r	the handle to destroy

Definition at line 774 of file gnunet-gns-proxy.c.

{
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Cleaning up socks request\n");
  if (NULL != s5r->curl)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Cleaning up cURL handle\n");
    curl_multi_remove_handle (curl_multi,
                              s5r->curl);
    curl_easy_cleanup (s5r->curl);
    s5r->curl = NULL;
  }
  if (s5r->suspended)
  {
    s5r->suspended = GNUNET_NO;
    MHD_resume_connection (s5r->con);
  }
  curl_slist_free_all (s5r->headers);
  if (NULL != s5r->hosts)
  {
    curl_slist_free_all (s5r->hosts);
  }
  if ((NULL != s5r->response) &&
      (curl_failure_response != s5r->response))
  {
    MHD_destroy_response (s5r->response);
    s5r->response = NULL;
  }
  if (NULL != s5r->rtask)
  {
    GNUNET_SCHEDULER_cancel (s5r->rtask);
    s5r->rtask = NULL;
  }
  if (NULL != s5r->timeout_task)
  {
    GNUNET_SCHEDULER_cancel (s5r->timeout_task);
    s5r->timeout_task = NULL;
  }
  if (NULL != s5r->wtask)
  {
    GNUNET_SCHEDULER_cancel (s5r->wtask);
    s5r->wtask = NULL;
  }
  if (NULL != s5r->gns_lookup)
  {
    GNUNET_GNS_lookup_with_tld_cancel (s5r->gns_lookup);
    s5r->gns_lookup = NULL;
  }
  if (NULL != s5r->sock)
  {
    if (SOCKS5_SOCKET_WITH_MHD <= s5r->state)
      GNUNET_NETWORK_socket_free_memory_only_ (s5r->sock);
    else
      GNUNET_NETWORK_socket_close (s5r->sock);
    s5r->sock = NULL;
  }
  GNUNET_CONTAINER_DLL_remove (s5r_head,
                               s5r_tail,
                               s5r);
  GNUNET_free (s5r->domain);
  GNUNET_free (s5r->leho);
  GNUNET_free (s5r->url);
  for (unsigned int i = 0; i < s5r->num_danes; i++)
    GNUNET_free (s5r->dane_data[i]);
  GNUNET_free (s5r);
}

References Socks5Request::con, Socks5Request::curl, curl_failure_response, curl_multi, Socks5Request::dane_data, Socks5Request::domain, Socks5Request::gns_lookup, GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_GNS_lookup_with_tld_cancel(), GNUNET_log, GNUNET_NETWORK_socket_close(), GNUNET_NETWORK_socket_free_memory_only_(), GNUNET_NO, GNUNET_SCHEDULER_cancel(), Socks5Request::headers, Socks5Request::hosts, Socks5Request::leho, Socks5Request::num_danes, Socks5Request::response, Socks5Request::rtask, s5r_head, s5r_tail, Socks5Request::sock, state, Socks5Request::suspended, Socks5Request::timeout_task, Socks5Request::url, and Socks5Request::wtask.

Referenced by do_s5r_read(), do_shutdown(), do_write(), mhd_connection_cb(), setup_data_transfer(), and timeout_s5r_handshake().

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curl_download_prepare()

static void curl_download_prepare ( )

static

Ask cURL for the select() sets and schedule cURL operations.

Definition at line 1571 of file gnunet-gns-proxy.c.

{
  CURLMcode mret;
  fd_set rs;
  fd_set ws;
  fd_set es;
  int max;
  struct GNUNET_NETWORK_FDSet *grs;
  struct GNUNET_NETWORK_FDSet *gws;
  long to;
  struct GNUNET_TIME_Relative rtime;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Scheduling CURL interaction\n");
  if (NULL != curl_download_task)
  {
    GNUNET_SCHEDULER_cancel (curl_download_task);
    curl_download_task = NULL;
  }
  max = -1;
  FD_ZERO (&rs);
  FD_ZERO (&ws);
  FD_ZERO (&es);
  if (CURLM_OK != (mret = curl_multi_fdset (curl_multi,
                                            &rs,
                                            &ws,
                                            &es,
                                            &max)))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "%s failed at %s:%d: `%s'\n",
                "curl_multi_fdset", __FILE__, __LINE__,
                curl_multi_strerror (mret));
    return;
  }
  to = -1;
  GNUNET_break (CURLM_OK ==
                curl_multi_timeout (curl_multi,
                                    &to));
  if (-1 == to)
    rtime = GNUNET_TIME_UNIT_FOREVER_REL;
  else
    rtime = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
                                           to);
  if (-1 != max)
  {
    grs = GNUNET_NETWORK_fdset_create ();
    gws = GNUNET_NETWORK_fdset_create ();
    GNUNET_NETWORK_fdset_copy_native (grs,
                                      &rs,
                                      max + 1);
    GNUNET_NETWORK_fdset_copy_native (gws,
                                      &ws,
                                      max + 1);
    curl_download_task = GNUNET_SCHEDULER_add_select (
      GNUNET_SCHEDULER_PRIORITY_DEFAULT,
      rtime,
      grs,
      gws,
      &curl_task_download,
      curl_multi);
    GNUNET_NETWORK_fdset_destroy (gws);
    GNUNET_NETWORK_fdset_destroy (grs);
  }
  else
  {
    curl_download_task = GNUNET_SCHEDULER_add_delayed (rtime,
                                                       &curl_task_download,
                                                       curl_multi);
  }
}

References curl_download_task, curl_multi, curl_task_download(), GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_NETWORK_fdset_copy_native(), GNUNET_NETWORK_fdset_create(), GNUNET_NETWORK_fdset_destroy(), GNUNET_SCHEDULER_add_delayed(), GNUNET_SCHEDULER_add_select(), GNUNET_SCHEDULER_cancel(), GNUNET_SCHEDULER_PRIORITY_DEFAULT, GNUNET_TIME_relative_multiply(), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_TIME_UNIT_MILLISECONDS, and max.

Referenced by create_response(), curl_task_download(), mhd_completed_cb(), mhd_connection_cb(), and mhd_content_cb().

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mhd_content_cb()

static ssize_t mhd_content_cb ( void *  cls, uint64_t  pos, char *  buf, size_t  max  )

static

Callback for MHD response generation.

This function is called from MHD whenever MHD expects to get data back. Copies data from the io_buf, if available.

Parameters

cls	closure with our struct Socks5Request
pos	in buffer
buf	where to copy data
max	available space in buf

Returns

number of bytes written to buf

Definition at line 861 of file gnunet-gns-proxy.c.

{
  struct Socks5Request *s5r = cls;
  size_t bytes_to_copy;
 
  if ((SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
      (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state))
  {
    /* we're still not done with the upload, do not yet
       start the download, the IO buffer is still full
       with upload data. */
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Pausing MHD download %s%s, not yet ready for download\n",
                s5r->domain,
                s5r->url);
    return 0;   /* not yet ready for data download */
  }
  bytes_to_copy = GNUNET_MIN (max,
                              s5r->io_len);
  if ((0 == bytes_to_copy) &&
      (SOCKS5_SOCKET_DOWNLOAD_DONE != s5r->state))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Pausing MHD download %s%s, no data available\n",
                s5r->domain,
                s5r->url);
    if (NULL != s5r->curl)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Continuing CURL interaction for %s%s\n",
                  s5r->domain,
                  s5r->url);
      if (GNUNET_YES == s5r->curl_paused)
      {
        s5r->curl_paused = GNUNET_NO;
        curl_easy_pause (s5r->curl,
                         CURLPAUSE_CONT);
      }
      curl_download_prepare ();
    }
    if (GNUNET_NO == s5r->suspended)
    {
      MHD_suspend_connection (s5r->con);
      s5r->suspended = GNUNET_YES;
    }
    return 0;   /* more data later */
  }
  if ((0 == bytes_to_copy) &&
      (SOCKS5_SOCKET_DOWNLOAD_DONE == s5r->state))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Completed MHD download %s%s\n",
                s5r->domain,
                s5r->url);
    return MHD_CONTENT_READER_END_OF_STREAM;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Writing %llu/%llu bytes to %s%s\n",
              (unsigned long long) bytes_to_copy,
              (unsigned long long) s5r->io_len,
              s5r->domain,
              s5r->url);
  GNUNET_memcpy (buf,
                 s5r->io_buf,
                 bytes_to_copy);
  memmove (s5r->io_buf,
           &s5r->io_buf[bytes_to_copy],
           s5r->io_len - bytes_to_copy);
  s5r->io_len -= bytes_to_copy;
  if ((NULL != s5r->curl) &&
      (GNUNET_YES == s5r->curl_paused))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Continuing CURL interaction for %s%s\n",
                s5r->domain,
                s5r->url);
    s5r->curl_paused = GNUNET_NO;
    curl_easy_pause (s5r->curl,
                     CURLPAUSE_CONT);
  }
  return bytes_to_copy;
}

References Socks5Request::con, Socks5Request::curl, curl_download_prepare(), Socks5Request::curl_paused, Socks5Request::domain, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_memcpy, GNUNET_MIN, GNUNET_NO, GNUNET_YES, Socks5Request::io_buf, Socks5Request::io_len, max, SOCKS5_SOCKET_DOWNLOAD_DONE, SOCKS5_SOCKET_UPLOAD_DONE, SOCKS5_SOCKET_UPLOAD_STARTED, Socks5Request::state, Socks5Request::suspended, and Socks5Request::url.

Referenced by create_mhd_response_from_s5r().

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check_ssl_certificate()

static int check_ssl_certificate ( struct Socks5Request *  s5r )

static

Check that the website has presented us with a valid X.509 certificate.

The certificate must either match the domain name or the LEHO name (or, if available, the TLSA record).

Parameters

s5r	request to check for.

Returns

GNUNET_OK if the certificate is valid

Definition at line 957 of file gnunet-gns-proxy.c.

{
  unsigned int cert_list_size;
  const gnutls_datum_t *chainp;
  const struct curl_tlssessioninfo *tlsinfo;
  char certdn[GNUNET_DNSPARSER_MAX_NAME_LENGTH + 3];
  size_t size;
  gnutls_x509_crt_t x509_cert;
  int rc;
  const char *name;
 
  s5r->ssl_checked = GNUNET_YES;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Checking X.509 certificate\n");
  if (CURLE_OK !=
      curl_easy_getinfo (s5r->curl,
                         CURLINFO_TLS_SSL_PTR,
                         &tlsinfo))
    return GNUNET_SYSERR;
  if (CURLSSLBACKEND_GNUTLS != tlsinfo->backend)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _ ("Unsupported CURL TLS backend %d\n"),
                tlsinfo->backend);
    return GNUNET_SYSERR;
  }
  chainp = gnutls_certificate_get_peers (tlsinfo->internals,
                                         &cert_list_size);
  if ((! chainp) ||
      (0 == cert_list_size))
    return GNUNET_SYSERR;
 
  size = sizeof(certdn);
  /* initialize an X.509 certificate structure. */
  gnutls_x509_crt_init (&x509_cert);
  gnutls_x509_crt_import (x509_cert,
                          chainp,
                          GNUTLS_X509_FMT_DER);
 
  if (0 != (rc = gnutls_x509_crt_get_dn_by_oid (x509_cert,
                                                GNUTLS_OID_X520_COMMON_NAME,
                                                0, /* the first and only one */
                                                0 /* no DER encoding */,
                                                certdn,
                                                &size)))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                _ ("Failed to fetch CN from cert: %s\n"),
                gnutls_strerror (rc));
    gnutls_x509_crt_deinit (x509_cert);
    return GNUNET_SYSERR;
  }
  /* check for TLSA/DANE records */
#if HAVE_GNUTLS_DANE
  if (0 != s5r->num_danes)
  {
    dane_state_t dane_state;
    dane_query_t dane_query;
    unsigned int verify;
 
    /* FIXME: add flags to gnutls to NOT read UNBOUND_ROOT_KEY_FILE here! */
    if (0 != (rc = dane_state_init (&dane_state,
#ifdef DANE_F_IGNORE_DNSSEC
                                    DANE_F_IGNORE_DNSSEC |
#endif
                                    DANE_F_IGNORE_LOCAL_RESOLVER)))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                  _ ("Failed to initialize DANE: %s\n"),
                  dane_strerror (rc));
      gnutls_x509_crt_deinit (x509_cert);
      return GNUNET_SYSERR;
    }
    s5r->dane_data[s5r->num_danes] = NULL;
    s5r->dane_data_len[s5r->num_danes] = 0;
    if (0 != (rc = dane_raw_tlsa (dane_state,
                                  &dane_query,
                                  s5r->dane_data,
                                  s5r->dane_data_len,
                                  GNUNET_YES,
                                  GNUNET_NO)))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                  _ ("Failed to parse DANE record: %s\n"),
                  dane_strerror (rc));
      dane_state_deinit (dane_state);
      gnutls_x509_crt_deinit (x509_cert);
      return GNUNET_SYSERR;
    }
    if (0 != (rc = dane_verify_crt_raw (dane_state,
                                        chainp,
                                        cert_list_size,
                                        gnutls_certificate_type_get (
                                          tlsinfo->internals),
                                        dane_query,
                                        0, 0,
                                        &verify)))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                  _ ("Failed to verify TLS connection using DANE: %s\n"),
                  dane_strerror (rc));
      dane_query_deinit (dane_query);
      dane_state_deinit (dane_state);
      gnutls_x509_crt_deinit (x509_cert);
      return GNUNET_SYSERR;
    }
    if (0 != verify)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                  _ (
                    "Failed DANE verification failed with GnuTLS verify status code: %u\n"),
                  verify);
      dane_query_deinit (dane_query);
      dane_state_deinit (dane_state);
      gnutls_x509_crt_deinit (x509_cert);
      return GNUNET_SYSERR;
    }
    dane_query_deinit (dane_query);
    dane_state_deinit (dane_state);
    /* success! */
  }
  else
#endif
  {
    /* try LEHO or ordinary domain name X509 verification */
    name = s5r->domain;
    if (NULL != s5r->leho)
      name = s5r->leho;
    if (NULL != name)
    {
      if (0 == (rc = gnutls_x509_crt_check_hostname (x509_cert,
                                                     name)))
      {
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    _ (
                      "TLS certificate subject name (%s) does not match `%s': %d\n"),
                    certdn,
                    name,
                    rc);
        gnutls_x509_crt_deinit (x509_cert);
        return GNUNET_SYSERR;
      }
    }
    else
    {
      /* we did not even have the domain name!? */
      GNUNET_break (0);
      return GNUNET_SYSERR;
    }
  }
  gnutls_x509_crt_deinit (x509_cert);
  return GNUNET_OK;
}

References _, Socks5Request::curl, Socks5Request::dane_data, Socks5Request::dane_data_len, Socks5Request::domain, GNUNET_break, GNUNET_DNSPARSER_MAX_NAME_LENGTH, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_NO, GNUNET_OK, GNUNET_SYSERR, GNUNET_YES, Socks5Request::leho, name, Socks5Request::num_danes, size, Socks5Request::ssl_checked, and verify.

Referenced by curl_check_hdr().

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curl_check_hdr()

static size_t curl_check_hdr ( void *  buffer, size_t  size, size_t  nmemb, void *  cls  )

static

We're getting an HTTP response header from cURL.

Convert it to the MHD response headers. Mostly copies the headers, but makes special adjustments to "Set-Cookie" and "Location" headers as those may need to be changed from the LEHO to the domain the browser expects.

Parameters

buffer	curl buffer with a single line of header data; not 0-terminated!
size	curl blocksize
nmemb	curl blocknumber
cls	our struct Socks5Request *

Returns

size of processed bytes

Definition at line 1125 of file gnunet-gns-proxy.c.

{
  struct Socks5Request *s5r = cls;
  struct HttpResponseHeader *header;
  size_t bytes = size * nmemb;
  char *ndup;
  const char *hdr_type;
  const char *cookie_domain;
  char *hdr_val;
  char *new_cookie_hdr;
  char *new_location;
  size_t offset;
  size_t delta_cdomain;
  int domain_matched;
  char *tok;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Receiving HTTP response header from CURL\n");
  /* first, check TLS certificate */
  if ((GNUNET_YES != s5r->ssl_checked) &&
      (GNUNET_YES == s5r->is_tls))
  // (HTTPS_PORT == s5r->port))
  {
    if (GNUNET_OK != check_ssl_certificate (s5r))
      return 0;
  }
  ndup = GNUNET_strndup (buffer,
                         bytes);
  hdr_type = strtok (ndup,
                     ":");
  if (NULL == hdr_type)
  {
    GNUNET_free (ndup);
    return bytes;
  }
  hdr_val = strtok (NULL,
                    "");
  if (NULL == hdr_val)
  {
    GNUNET_free (ndup);
    return bytes;
  }
  if (' ' == *hdr_val)
    hdr_val++;
 
  /* custom logic for certain header types */
  new_cookie_hdr = NULL;
  if ((NULL != s5r->leho) &&
      (0 == strcasecmp (hdr_type,
                        MHD_HTTP_HEADER_SET_COOKIE)))
 
  {
    new_cookie_hdr = GNUNET_malloc (strlen (hdr_val)
                                    + strlen (s5r->domain) + 1);
    offset = 0;
    domain_matched = GNUNET_NO;   /* make sure we match domain at most once */
    for (tok = strtok (hdr_val, ";"); NULL != tok; tok = strtok (NULL, ";"))
    {
      if ((0 == strncasecmp (tok,
                             " domain",
                             strlen (" domain"))) &&
          (GNUNET_NO == domain_matched))
      {
        domain_matched = GNUNET_YES;
        cookie_domain = tok + strlen (" domain") + 1;
        if (strlen (cookie_domain) < strlen (s5r->leho))
        {
          delta_cdomain = strlen (s5r->leho) - strlen (cookie_domain);
          if (0 == strcasecmp (cookie_domain,
                               s5r->leho + delta_cdomain))
          {
            offset += sprintf (new_cookie_hdr + offset,
                               " domain=%s;",
                               s5r->domain);
            continue;
          }
        }
        else if (0 == strcmp (cookie_domain,
                              s5r->leho))
        {
          offset += sprintf (new_cookie_hdr + offset,
                             " domain=%s;",
                             s5r->domain);
          continue;
        }
        else if (('.' == cookie_domain[0]) &&
                 (0 == strcmp (&cookie_domain[1],
                               s5r->leho)))
        {
          offset += sprintf (new_cookie_hdr + offset,
                             " domain=.%s;",
                             s5r->domain);
          continue;
        }
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    _ ("Cookie domain `%s' supplied by server is invalid\n"),
                    tok);
      }
      GNUNET_memcpy (new_cookie_hdr + offset,
                     tok,
                     strlen (tok));
      offset += strlen (tok);
      new_cookie_hdr[offset++] = ';';
    }
    hdr_val = new_cookie_hdr;
    hdr_val[offset] = '\0';
  }
 
  new_location = NULL;
  if (0 == strcasecmp (MHD_HTTP_HEADER_TRANSFER_ENCODING,
                       hdr_type))
  {
    /* Ignore transfer encoding, set automatically by MHD if required */
    goto cleanup;
  }
  if ((0 == strcasecmp (MHD_HTTP_HEADER_LOCATION,
                        hdr_type)))
  {
    char *leho_host;
 
    GNUNET_asprintf (&leho_host,
                     (GNUNET_YES != s5r->is_tls)  // (HTTPS_PORT != s5r->port)
                     ? "http://%s"
                     : "https://%s",
                     s5r->leho);
    if (0 == strncmp (leho_host,
                      hdr_val,
                      strlen (leho_host)))
    {
      GNUNET_asprintf (&new_location,
                       "%s%s%s",
                       (GNUNET_YES != s5r->is_tls)    // (HTTPS_PORT != s5r->port)
                       ? "http://"
                       : "https://",
                       s5r->domain,
                       hdr_val + strlen (leho_host));
      hdr_val = new_location;
    }
    GNUNET_free (leho_host);
  }
  else if (0 == strcasecmp (MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN,
                            hdr_type))
  {
    char *leho_host;
 
    GNUNET_asprintf (&leho_host,
                     (GNUNET_YES != s5r->is_tls)  // (HTTPS_PORT != s5r->port)
                     ? "http://%s"
                     : "https://%s",
                     s5r->leho);
    if (0 == strncmp (leho_host,
                      hdr_val,
                      strlen (leho_host)))
    {
      GNUNET_asprintf (&new_location,
                       "%s%s",
                       (GNUNET_YES != s5r->is_tls)    // (HTTPS_PORT != s5r->port)
                       ? "http://"
                       : "https://",
                       s5r->domain);
      hdr_val = new_location;
    }
    GNUNET_free (leho_host);
  }
 
  /* MHD does not allow certain characters in values, remove those */
  if (NULL != (tok = strchr (hdr_val, '\n')))
    *tok = '\0';
  if (NULL != (tok = strchr (hdr_val, '\r')))
    *tok = '\0';
  if (NULL != (tok = strchr (hdr_val, '\t')))
    *tok = '\0';
  if (0 != strlen (hdr_val))  /* Rely in MHD to set those */
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Adding header %s: %s to MHD response\n",
                hdr_type,
                hdr_val);
    header = GNUNET_new (struct HttpResponseHeader);
    header->type = GNUNET_strdup (hdr_type);
    header->value = GNUNET_strdup (hdr_val);
    GNUNET_CONTAINER_DLL_insert (s5r->header_head,
                                 s5r->header_tail,
                                 header);
  }
  cleanup:
  GNUNET_free (ndup);
  GNUNET_free (new_cookie_hdr);
  GNUNET_free (new_location);
  return bytes;
}

References _, check_ssl_certificate(), cleanup(), Socks5Request::domain, GNUNET_asprintf(), GNUNET_CONTAINER_DLL_insert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_memcpy, GNUNET_new, GNUNET_NO, GNUNET_OK, GNUNET_strdup, GNUNET_strndup, GNUNET_YES, Socks5Request::header_head, Socks5Request::header_tail, Socks5Request::is_tls, Socks5Request::leho, size, Socks5Request::ssl_checked, HttpResponseHeader::type, and HttpResponseHeader::value.

Referenced by create_response().

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create_mhd_response_from_s5r()

static int create_mhd_response_from_s5r ( struct Socks5Request *  s5r )

static

Create an MHD response object in s5r matching the information we got from curl.

Parameters

s5r	the request for which we convert the response

Returns

GNUNET_OK on success, GNUNET_SYSERR if response was already initialized before

Definition at line 1330 of file gnunet-gns-proxy.c.

{
  long resp_code;
  double content_length;
 
  if (NULL != s5r->response)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Response already set!\n");
    return GNUNET_SYSERR;
  }
 
  GNUNET_break (CURLE_OK ==
                curl_easy_getinfo (s5r->curl,
                                   CURLINFO_RESPONSE_CODE,
                                   &resp_code));
  GNUNET_break (CURLE_OK ==
                curl_easy_getinfo (s5r->curl,
                                   CURLINFO_CONTENT_LENGTH_DOWNLOAD_T,
                                   &content_length));
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Creating MHD response with code %d and size %d for %s%s\n",
              (int) resp_code,
              (int) content_length,
              s5r->domain,
              s5r->url);
  s5r->response_code = resp_code;
  s5r->response = MHD_create_response_from_callback ((-1 == content_length)
                                                     ? MHD_SIZE_UNKNOWN
                                                     : content_length,
                                                     IO_BUFFERSIZE,
                                                     &mhd_content_cb,
                                                     s5r,
                                                     NULL);
  for (struct HttpResponseHeader *header = s5r->header_head;
       NULL != header;
       header = header->next)
  {
    if (0 == strcasecmp (header->type,
                         MHD_HTTP_HEADER_CONTENT_LENGTH))
      continue;   /* MHD won't let us mess with those, for good reason */
    if ((0 == strcasecmp (header->type,
                          MHD_HTTP_HEADER_TRANSFER_ENCODING)) &&
        ((0 == strcasecmp (header->value,
                           "identity")) ||
         (0 == strcasecmp (header->value,
                           "chunked"))))
      continue;   /* MHD won't let us mess with those, for good reason */
    if (MHD_YES !=
        MHD_add_response_header (s5r->response,
                                 header->type,
                                 header->value))
    {
      GNUNET_break (0);
      GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                  "Failed to add header `%s:%s'\n",
                  header->type,
                  header->value);
    }
  }
  /* force connection to be closed after each request, as we
     do not support HTTP pipelining (yet, FIXME!) */
  /*GNUNET_break (MHD_YES ==
     MHD_add_response_header (s5r->response,
     MHD_HTTP_HEADER_CONNECTION,
     "close"));*/
  MHD_resume_connection (s5r->con);
  s5r->suspended = GNUNET_NO;
  return GNUNET_OK;
}

References Socks5Request::con, Socks5Request::curl, Socks5Request::domain, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_INFO, GNUNET_log, GNUNET_NO, GNUNET_OK, GNUNET_SYSERR, Socks5Request::header_head, IO_BUFFERSIZE, mhd_content_cb(), HttpResponseHeader::next, Socks5Request::response, Socks5Request::response_code, Socks5Request::suspended, and Socks5Request::url.

Referenced by curl_download_cb(), and curl_task_download().

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curl_download_cb()

static size_t curl_download_cb ( void *  ptr, size_t  size, size_t  nmemb, void *  ctx  )

static

Handle response payload data from cURL.

Copies it into our io_buf to make it available to MHD.

Parameters

ptr	pointer to the data
size	number of blocks of data
nmemb	blocksize
ctx	our struct Socks5Request *

Returns

number of bytes handled

Definition at line 1413 of file gnunet-gns-proxy.c.

{
  struct Socks5Request *s5r = ctx;
  size_t total = size * nmemb;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Receiving %ux%u bytes for `%s%s' from cURL to download\n",
              (unsigned int) size,
              (unsigned int) nmemb,
              s5r->domain,
              s5r->url);
  if (NULL == s5r->response)
    GNUNET_assert (GNUNET_OK ==
                   create_mhd_response_from_s5r (s5r));
  if ((SOCKS5_SOCKET_UPLOAD_DONE == s5r->state) &&
      (0 == s5r->io_len))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Previous upload finished... starting DOWNLOAD.\n");
    s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
  }
  if ((SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state) ||
      (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state))
  {
    /* we're still not done with the upload, do not yet
       start the download, the IO buffer is still full
       with upload data. */
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Pausing CURL download `%s%s', waiting for UPLOAD to finish\n",
                s5r->domain,
                s5r->url);
    s5r->curl_paused = GNUNET_YES;
    return CURL_WRITEFUNC_PAUSE;   /* not yet ready for data download */
  }
  if (sizeof(s5r->io_buf) - s5r->io_len < total)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Pausing CURL `%s%s' download, not enough space %llu %llu %llu\n",
                s5r->domain,
                s5r->url,
                (unsigned long long) sizeof(s5r->io_buf),
                (unsigned long long) s5r->io_len,
                (unsigned long long) total);
    s5r->curl_paused = GNUNET_YES;
    return CURL_WRITEFUNC_PAUSE;   /* not enough space */
  }
  GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
                 ptr,
                 total);
  s5r->io_len += total;
  if (GNUNET_YES == s5r->suspended)
  {
    MHD_resume_connection (s5r->con);
    s5r->suspended = GNUNET_NO;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received %llu bytes of payload via cURL from %s\n",
              (unsigned long long) total,
              s5r->domain);
  if (s5r->io_len == total)
    run_mhd_now (s5r->hd);
  return total;
}

References Socks5Request::con, create_mhd_response_from_s5r(), ctx, Socks5Request::curl_paused, Socks5Request::domain, GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_memcpy, GNUNET_NO, GNUNET_OK, GNUNET_YES, Socks5Request::hd, Socks5Request::io_buf, Socks5Request::io_len, Socks5Request::response, run_mhd_now(), size, SOCKS5_SOCKET_DOWNLOAD_STARTED, SOCKS5_SOCKET_UPLOAD_DONE, SOCKS5_SOCKET_UPLOAD_STARTED, Socks5Request::state, Socks5Request::suspended, and Socks5Request::url.

Referenced by create_response().

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curl_upload_cb()

static size_t curl_upload_cb ( void *  buf, size_t  size, size_t  nmemb, void *  cls  )

static

cURL callback for uploaded (PUT/POST) data.

Copies it into our io_buf to make it available to MHD.

Parameters

buf	where to write the data
size	number of bytes per member
nmemb	number of members available in buf
cls	our struct Socks5Request that generated the data

Returns

number of bytes copied to buf

Definition at line 1492 of file gnunet-gns-proxy.c.

{
  struct Socks5Request *s5r = cls;
  size_t len = size * nmemb;
  size_t to_copy;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Receiving %ux%u bytes for `%s%s' from cURL to upload\n",
              (unsigned int) size,
              (unsigned int) nmemb,
              s5r->domain,
              s5r->url);
 
  if ((0 == s5r->io_len) &&
      (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Pausing CURL UPLOAD %s%s, need more data\n",
                s5r->domain,
                s5r->url);
    return CURL_READFUNC_PAUSE;
  }
  if ((0 == s5r->io_len) &&
      (SOCKS5_SOCKET_UPLOAD_DONE == s5r->state))
  {
    s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
    if (GNUNET_YES == s5r->curl_paused)
    {
      s5r->curl_paused = GNUNET_NO;
      curl_easy_pause (s5r->curl,
                       CURLPAUSE_CONT);
    }
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Completed CURL UPLOAD %s%s\n",
                s5r->domain,
                s5r->url);
    return 0;   /* upload finished, can now download */
  }
  if ((SOCKS5_SOCKET_UPLOAD_STARTED != s5r->state) &&
      (SOCKS5_SOCKET_UPLOAD_DONE != s5r->state))
  {
    GNUNET_break (0);
    return CURL_READFUNC_ABORT;
  }
  to_copy = GNUNET_MIN (s5r->io_len,
                        len);
  GNUNET_memcpy (buf,
                 s5r->io_buf,
                 to_copy);
  memmove (s5r->io_buf,
           &s5r->io_buf[to_copy],
           s5r->io_len - to_copy);
  s5r->io_len -= to_copy;
  if (s5r->io_len + to_copy == sizeof(s5r->io_buf))
    run_mhd_now (s5r->hd); /* got more space for upload now */
  return to_copy;
}

References Socks5Request::curl, Socks5Request::curl_paused, Socks5Request::domain, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_memcpy, GNUNET_MIN, GNUNET_NO, GNUNET_YES, Socks5Request::hd, Socks5Request::io_buf, Socks5Request::io_len, run_mhd_now(), size, SOCKS5_SOCKET_DOWNLOAD_STARTED, SOCKS5_SOCKET_UPLOAD_DONE, SOCKS5_SOCKET_UPLOAD_STARTED, Socks5Request::state, and Socks5Request::url.

Referenced by create_response().

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curl_task_download()

static void curl_task_download ( void *  cls )

static

Task that is run when we are ready to receive more data from curl.

Parameters

cls	closure
cls	closure, NULL

Definition at line 1650 of file gnunet-gns-proxy.c.

{
  int running;
  int msgnum;
  struct CURLMsg *msg;
  CURLMcode mret;
  struct Socks5Request *s5r;
 
  curl_download_task = NULL;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Running CURL interaction\n");
  do
  {
    running = 0;
    mret = curl_multi_perform (curl_multi,
                               &running);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Checking CURL multi status: %d\n",
                mret);
    while (NULL != (msg = curl_multi_info_read (curl_multi,
                                                &msgnum)))
    {
      GNUNET_break (CURLE_OK ==
                    curl_easy_getinfo (msg->easy_handle,
                                       CURLINFO_PRIVATE,
                                       (char **) &s5r));
      if (NULL == s5r)
      {
        GNUNET_break (0);
        continue;
      }
      switch (msg->msg)
      {
      case CURLMSG_NONE:
        /* documentation says this is not used */
        GNUNET_break (0);
        break;
 
      case CURLMSG_DONE:
        switch (msg->data.result)
        {
        case CURLE_OK:
        case CURLE_GOT_NOTHING:
          GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                      "CURL download %s%s completed.\n",
                      s5r->domain,
                      s5r->url);
          if (NULL == s5r->response)
          {
            GNUNET_assert (GNUNET_OK ==
                           create_mhd_response_from_s5r (s5r));
          }
          s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
          if (GNUNET_YES == s5r->suspended)
          {
            MHD_resume_connection (s5r->con);
            s5r->suspended = GNUNET_NO;
          }
          run_mhd_now (s5r->hd);
          break;
 
        default:
          GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                      "Download curl %s%s failed: %s\n",
                      s5r->domain,
                      s5r->url,
                      curl_easy_strerror (msg->data.result));
          /* FIXME: indicate error somehow? close MHD connection badly as well? */
          s5r->state = SOCKS5_SOCKET_DOWNLOAD_DONE;
          if (GNUNET_YES == s5r->suspended)
          {
            MHD_resume_connection (s5r->con);
            s5r->suspended = GNUNET_NO;
          }
          run_mhd_now (s5r->hd);
          break;
        }
        if (NULL == s5r->response)
          s5r->response = curl_failure_response;
        break;
 
      case CURLMSG_LAST:
        /* documentation says this is not used */
        GNUNET_break (0);
        break;
 
      default:
        /* unexpected status code */
        GNUNET_break (0);
        break;
      }
    }
    ;
  }
  while (mret == CURLM_CALL_MULTI_PERFORM);
  if (CURLM_OK != mret)
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "%s failed at %s:%d: `%s'\n",
                "curl_multi_perform", __FILE__, __LINE__,
                curl_multi_strerror (mret));
  if (0 == running)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Suspending cURL multi loop, no more events pending\n");
    if (NULL != curl_download_task)
    {
      GNUNET_SCHEDULER_cancel (curl_download_task);
      curl_download_task = NULL;
    }
    return;   /* nothing more in progress */
  }
  curl_download_prepare ();
}

References create_mhd_response_from_s5r(), curl_download_prepare(), curl_download_task, curl_failure_response, curl_multi, GNUNET_assert, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_NO, GNUNET_OK, GNUNET_SCHEDULER_cancel(), GNUNET_YES, msg, run_mhd_now(), and SOCKS5_SOCKET_DOWNLOAD_DONE.

Referenced by curl_download_prepare().

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con_val_iter()

static int con_val_iter ( void *  cls, enum MHD_ValueKind  kind, const char *  key, const char *  value  )

static

Read HTTP request header field from the request.

Copies the fields over to the 'headers' that will be given to curl. However, 'Host' is substituted with the LEHO if present. We also change the 'Connection' header value to "close" as the proxy does not support pipelining.

Parameters

cls	our struct Socks5Request
kind	value kind
key	field key
value	field value

Returns

#MHD_YES to continue to iterate

Definition at line 1782 of file gnunet-gns-proxy.c.

{
  struct Socks5Request *s5r = cls;
  char *hdr;
 
  if ((0 == strcasecmp (MHD_HTTP_HEADER_HOST,
                        key)) &&
      (NULL != s5r->leho))
    value = s5r->leho;
  GNUNET_asprintf (&hdr,
                   "%s: %s",
                   key,
                   value);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Adding HEADER `%s' to HTTP request\n",
              hdr);
  s5r->headers = curl_slist_append (s5r->headers,
                                    hdr);
  GNUNET_free (hdr);
  return MHD_YES;
}

References GNUNET_asprintf(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, Socks5Request::headers, key, Socks5Request::leho, and value.

Referenced by create_response().

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create_response()

static MHD_RESULT create_response ( void *  cls, struct MHD_Connection *  con, const char *  url, const char *  meth, const char *  ver, const char *  upload_data, size_t *  upload_data_size, void **  con_cls  )

static

Main MHD callback for handling requests.

Parameters

cls	unused
con	MHD connection handle
url	the url in the request
meth	the HTTP method used ("GET", "PUT", etc.)
ver	the HTTP version string ("HTTP/1.1" for version 1.1, etc.)
upload_data	the data being uploaded (excluding HEADERS, for a POST that fits into memory and that is encoded with a supported encoding, the POST data will NOT be given in upload_data and is instead available as part of MHD_get_connection_values; very large POST data will be made available incrementally in upload_data)
upload_data_size	set initially to the size of the upload_data provided; the method must update this value to the number of bytes NOT processed;
con_cls	pointer to location where we store the struct Request

Returns

#MHD_YES if the connection was handled successfully, #MHD_NO if the socket must be closed due to a serious error while handling the request

Pre-populate cache to resolve Hostname. This is necessary as the DNS name in the CURLOPT_URL is used for SNI http://de.wikipedia.org/wiki/Server_Name_Indication

Definition at line 1832 of file gnunet-gns-proxy.c.

{
  struct Socks5Request *s5r = *con_cls;
  char *curlurl;
  char ipstring[INET6_ADDRSTRLEN];
  char ipaddr[INET6_ADDRSTRLEN + 2];
  char *curl_hosts;
  const struct sockaddr *sa;
  const struct sockaddr_in *s4;
  const struct sockaddr_in6 *s6;
  uint16_t port;
  size_t left;
 
  if (NULL == s5r)
  {
    GNUNET_break (0);
    return MHD_NO;
  }
  s5r->con = con;
  /* Fresh connection. */
  if (SOCKS5_SOCKET_WITH_MHD == s5r->state)
  {
    /* first time here, initialize curl handle */
    if (s5r->is_gns)
    {
      sa = (const struct sockaddr *) &s5r->destination_address;
      switch (sa->sa_family)
      {
      case AF_INET:
        s4 = (const struct sockaddr_in *) &s5r->destination_address;
        if (NULL == inet_ntop (AF_INET,
                               &s4->sin_addr,
                               ipstring,
                               sizeof(ipstring)))
        {
          GNUNET_break (0);
          return MHD_NO;
        }
        GNUNET_snprintf (ipaddr,
                         sizeof(ipaddr),
                         "%s",
                         ipstring);
        port = ntohs (s4->sin_port);
        break;
 
      case AF_INET6:
        s6 = (const struct sockaddr_in6 *) &s5r->destination_address;
        if (NULL == inet_ntop (AF_INET6,
                               &s6->sin6_addr,
                               ipstring,
                               sizeof(ipstring)))
        {
          GNUNET_break (0);
          return MHD_NO;
        }
        GNUNET_snprintf (ipaddr,
                         sizeof(ipaddr),
                         "%s",
                         ipstring);
        port = ntohs (s6->sin6_port);
        break;
 
      default:
        GNUNET_break (0);
        return MHD_NO;
      }
      GNUNET_asprintf (&curl_hosts,
                       "%s:%d:%s",
                       s5r->leho,
                       port,
                       ipaddr);
      s5r->hosts = curl_slist_append (NULL,
                                      curl_hosts);
      GNUNET_free (curl_hosts);
    }
    else
    {
      port = s5r->port;
    }
    if (NULL == s5r->curl)
      s5r->curl = curl_easy_init ();
    if (NULL == s5r->curl)
      return MHD_queue_response (con,
                                 MHD_HTTP_INTERNAL_SERVER_ERROR,
                                 curl_failure_response);
    curl_easy_setopt (s5r->curl,
                      CURLOPT_HEADERFUNCTION,
                      &curl_check_hdr);
    curl_easy_setopt (s5r->curl,
                      CURLOPT_HEADERDATA,
                      s5r);
    curl_easy_setopt (s5r->curl,
                      CURLOPT_FOLLOWLOCATION,
                      0);
    if (s5r->is_gns)
      curl_easy_setopt (s5r->curl,
                        CURLOPT_IPRESOLVE,
                        CURL_IPRESOLVE_V4);
    curl_easy_setopt (s5r->curl,
                      CURLOPT_CONNECTTIMEOUT,
                      600L);
    curl_easy_setopt (s5r->curl,
                      CURLOPT_TIMEOUT,
                      600L);
    curl_easy_setopt (s5r->curl,
                      CURLOPT_NOSIGNAL,
                      1L);
    curl_easy_setopt (s5r->curl,
                      CURLOPT_HTTP_CONTENT_DECODING,
                      0);
    curl_easy_setopt (s5r->curl,
                      CURLOPT_NOSIGNAL,
                      1L);
    curl_easy_setopt (s5r->curl,
                      CURLOPT_PRIVATE,
                      s5r);
    curl_easy_setopt (s5r->curl,
                      CURLOPT_VERBOSE,
                      0L);
    if ((NULL != s5r->leho) &&
        (NULL != s5r->hosts))
    {
      curl_easy_setopt (s5r->curl,
                        CURLOPT_RESOLVE,
                        s5r->hosts);
    }
    if (s5r->is_gns)
    {
      GNUNET_asprintf (&curlurl,
                       (GNUNET_YES != s5r->is_tls)    // (HTTPS_PORT != s5r->port)
                       ? "http://%s:%d%s"
                       : "https://%s:%d%s",
                       (NULL != s5r->leho)
                       ? s5r->leho
                       : ipaddr,
                       port,
                       s5r->url);
    }
    else
    {
      GNUNET_asprintf (&curlurl,
                       (GNUNET_YES != s5r->is_tls)    // (HTTPS_PORT != s5r->port)
                       ? "http://%s:%d%s"
                       : "https://%s:%d%s",
                       s5r->domain,
                       port,
                       s5r->url);
    }
    curl_easy_setopt (s5r->curl,
                      CURLOPT_URL,
                      curlurl);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Launching %s CURL interaction, fetching `%s'\n",
                (s5r->is_gns) ? "GNS" : "DNS",
                curlurl);
    GNUNET_free (curlurl);
    if (0 == strcasecmp (meth,
                         MHD_HTTP_METHOD_PUT))
    {
      s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
      curl_easy_setopt (s5r->curl,
                        CURLOPT_UPLOAD,
                        1L);
      curl_easy_setopt (s5r->curl,
                        CURLOPT_WRITEFUNCTION,
                        &curl_download_cb);
      curl_easy_setopt (s5r->curl,
                        CURLOPT_WRITEDATA,
                        s5r);
      GNUNET_assert (CURLE_OK ==
                     curl_easy_setopt (s5r->curl,
                                       CURLOPT_READFUNCTION,
                                       &curl_upload_cb));
      curl_easy_setopt (s5r->curl,
                        CURLOPT_READDATA,
                        s5r);
      {
        const char *us;
        long upload_size = 0;
 
        us = MHD_lookup_connection_value (con,
                                          MHD_HEADER_KIND,
                                          MHD_HTTP_HEADER_CONTENT_LENGTH);
        if ((1 == sscanf (us,
                          "%ld",
                          &upload_size)) &&
            (upload_size >= 0))
        {
          curl_easy_setopt (s5r->curl,
                            CURLOPT_INFILESIZE,
                            upload_size);
        }
      }
    }
    else if (0 == strcasecmp (meth, MHD_HTTP_METHOD_POST))
    {
      s5r->state = SOCKS5_SOCKET_UPLOAD_STARTED;
      curl_easy_setopt (s5r->curl,
                        CURLOPT_POST,
                        1L);
      curl_easy_setopt (s5r->curl,
                        CURLOPT_WRITEFUNCTION,
                        &curl_download_cb);
      curl_easy_setopt (s5r->curl,
                        CURLOPT_WRITEDATA,
                        s5r);
      curl_easy_setopt (s5r->curl,
                        CURLOPT_READFUNCTION,
                        &curl_upload_cb);
      curl_easy_setopt (s5r->curl,
                        CURLOPT_READDATA,
                        s5r);
      {
        const char *us;
        long upload_size;
 
        upload_size = 0;
        us = MHD_lookup_connection_value (con,
                                          MHD_HEADER_KIND,
                                          MHD_HTTP_HEADER_CONTENT_LENGTH);
        if ((NULL != us) &&
            (1 == sscanf (us,
                          "%ld",
                          &upload_size)) &&
            (upload_size >= 0))
        {
          curl_easy_setopt (s5r->curl,
                            CURLOPT_INFILESIZE,
                            upload_size);
        }
        else
        {
          curl_easy_setopt (s5r->curl,
                            CURLOPT_INFILESIZE,
                            upload_size);
        }
      }
    }
    else if (0 == strcasecmp (meth,
                              MHD_HTTP_METHOD_HEAD))
    {
      s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
      curl_easy_setopt (s5r->curl,
                        CURLOPT_NOBODY,
                        1L);
    }
    else if (0 == strcasecmp (meth,
                              MHD_HTTP_METHOD_OPTIONS))
    {
      s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
      curl_easy_setopt (s5r->curl,
                        CURLOPT_CUSTOMREQUEST,
                        "OPTIONS");
      curl_easy_setopt (s5r->curl,
                        CURLOPT_WRITEFUNCTION,
                        &curl_download_cb);
      curl_easy_setopt (s5r->curl,
                        CURLOPT_WRITEDATA,
                        s5r);
    }
    else if (0 == strcasecmp (meth,
                              MHD_HTTP_METHOD_GET))
    {
      s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
      curl_easy_setopt (s5r->curl,
                        CURLOPT_HTTPGET,
                        1L);
      curl_easy_setopt (s5r->curl,
                        CURLOPT_WRITEFUNCTION,
                        &curl_download_cb);
      curl_easy_setopt (s5r->curl,
                        CURLOPT_WRITEDATA,
                        s5r);
    }
    else if (0 == strcasecmp (meth,
                              MHD_HTTP_METHOD_DELETE))
    {
      s5r->state = SOCKS5_SOCKET_DOWNLOAD_STARTED;
      curl_easy_setopt (s5r->curl,
                        CURLOPT_CUSTOMREQUEST,
                        "DELETE");
      curl_easy_setopt (s5r->curl,
                        CURLOPT_WRITEFUNCTION,
                        &curl_download_cb);
      curl_easy_setopt (s5r->curl,
                        CURLOPT_WRITEDATA,
                        s5r);
    }
    else
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                  _ ("Unsupported HTTP method `%s'\n"),
                  meth);
      curl_easy_cleanup (s5r->curl);
      s5r->curl = NULL;
      return MHD_NO;
    }
 
    if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_0))
    {
      curl_easy_setopt (s5r->curl,
                        CURLOPT_HTTP_VERSION,
                        CURL_HTTP_VERSION_1_0);
    }
    else if (0 == strcasecmp (ver, MHD_HTTP_VERSION_1_1))
    {
      curl_easy_setopt (s5r->curl,
                        CURLOPT_HTTP_VERSION,
                        CURL_HTTP_VERSION_1_1);
    }
    else
    {
      curl_easy_setopt (s5r->curl,
                        CURLOPT_HTTP_VERSION,
                        CURL_HTTP_VERSION_NONE);
    }
 
    if (GNUNET_YES == s5r->is_tls)   // (HTTPS_PORT == s5r->port)
    {
      curl_easy_setopt (s5r->curl,
                        CURLOPT_USE_SSL,
                        CURLUSESSL_ALL);
      if (0 < s5r->num_danes)
        curl_easy_setopt (s5r->curl,
                          CURLOPT_SSL_VERIFYPEER,
                          0L);
      else
        curl_easy_setopt (s5r->curl,
                          CURLOPT_SSL_VERIFYPEER,
                          1L);
      /* Disable cURL checking the hostname, as we will check ourselves
         as only we have the domain name or the LEHO or the DANE record */
      curl_easy_setopt (s5r->curl,
                        CURLOPT_SSL_VERIFYHOST,
                        0L);
    }
    else
    {
      curl_easy_setopt (s5r->curl,
                        CURLOPT_USE_SSL,
                        CURLUSESSL_NONE);
    }
 
    if (CURLM_OK !=
        curl_multi_add_handle (curl_multi,
                               s5r->curl))
    {
      GNUNET_break (0);
      curl_easy_cleanup (s5r->curl);
      s5r->curl = NULL;
      return MHD_NO;
    }
    MHD_get_connection_values (con,
                               MHD_HEADER_KIND,
                               (MHD_KeyValueIterator) & con_val_iter,
                               s5r);
    curl_easy_setopt (s5r->curl,
                      CURLOPT_HTTPHEADER,
                      s5r->headers);
    curl_download_prepare ();
    return MHD_YES;
  }
 
  /* continuing to process request */
  if (0 != *upload_data_size)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Processing %u bytes UPLOAD\n",
                (unsigned int) *upload_data_size);
 
    /* FIXME: This must be set or a header with Transfer-Encoding: chunked. Else
     * upload callback is not called!
     */
    curl_easy_setopt (s5r->curl,
                      CURLOPT_POSTFIELDSIZE,
                      *upload_data_size);
 
    left = GNUNET_MIN (*upload_data_size,
                       sizeof(s5r->io_buf) - s5r->io_len);
    GNUNET_memcpy (&s5r->io_buf[s5r->io_len],
                   upload_data,
                   left);
    s5r->io_len += left;
    *upload_data_size -= left;
    GNUNET_assert (NULL != s5r->curl);
    if (GNUNET_YES == s5r->curl_paused)
    {
      s5r->curl_paused = GNUNET_NO;
      curl_easy_pause (s5r->curl,
                       CURLPAUSE_CONT);
    }
    return MHD_YES;
  }
  if (SOCKS5_SOCKET_UPLOAD_STARTED == s5r->state)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Finished processing UPLOAD\n");
    s5r->state = SOCKS5_SOCKET_UPLOAD_DONE;
  }
  if (NULL == s5r->response)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Waiting for HTTP response for %s%s...\n",
                s5r->domain,
                s5r->url);
    MHD_suspend_connection (con);
    s5r->suspended = GNUNET_YES;
    return MHD_YES;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Queueing response for %s%s with MHD\n",
              s5r->domain,
              s5r->url);
  run_mhd_now (s5r->hd);
  return MHD_queue_response (con,
                             s5r->response_code,
                             s5r->response);
}

References _, Socks5Request::con, con_val_iter(), Socks5Request::curl, curl_check_hdr(), curl_download_cb(), curl_download_prepare(), curl_failure_response, curl_multi, Socks5Request::curl_paused, curl_upload_cb(), Socks5Request::destination_address, Socks5Request::domain, GNUNET_asprintf(), GNUNET_assert, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_memcpy, GNUNET_MIN, GNUNET_NO, GNUNET_snprintf(), GNUNET_YES, Socks5Request::hd, Socks5Request::headers, Socks5Request::hosts, Socks5Request::io_buf, Socks5Request::io_len, Socks5Request::is_gns, Socks5Request::is_tls, Socks5Request::leho, MHD_HTTP_INTERNAL_SERVER_ERROR, Socks5Request::num_danes, Socks5Request::port, port, Socks5Request::response, Socks5Request::response_code, run_mhd_now(), SOCKS5_SOCKET_DOWNLOAD_STARTED, SOCKS5_SOCKET_UPLOAD_DONE, SOCKS5_SOCKET_UPLOAD_STARTED, SOCKS5_SOCKET_WITH_MHD, Socks5Request::state, Socks5Request::suspended, and Socks5Request::url.

Referenced by lookup_ssl_httpd(), and run().

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mhd_completed_cb()

static void mhd_completed_cb ( void *  cls, struct MHD_Connection *  connection, void **  con_cls, enum MHD_RequestTerminationCode  toe  )

static

Function called when MHD decides that we are done with a request.

Parameters

cls	NULL
connection	connection handle
con_cls	value as set by the last call to the MHD_AccessHandlerCallback, should be our struct Socks5Request *
toe	reason for request termination (ignored)

Definition at line 2277 of file gnunet-gns-proxy.c.

{
  struct Socks5Request *s5r = *con_cls;
 
  if (NULL == s5r)
    return;
  if (MHD_REQUEST_TERMINATED_COMPLETED_OK != toe)
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "MHD encountered error handling request: %d\n",
                toe);
  if (NULL != s5r->curl)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Removing cURL handle (MHD interaction complete)\n");
    curl_multi_remove_handle (curl_multi,
                              s5r->curl);
    curl_slist_free_all (s5r->headers);
    s5r->headers = NULL;
    curl_easy_reset (s5r->curl);
    s5r->rbuf_len = 0;
    s5r->wbuf_len = 0;
    s5r->io_len = 0;
    curl_download_prepare ();
  }
  if ((NULL != s5r->response) &&
      (curl_failure_response != s5r->response))
    MHD_destroy_response (s5r->response);
  for (struct HttpResponseHeader *header = s5r->header_head;
       NULL != header;
       header = s5r->header_head)
  {
    GNUNET_CONTAINER_DLL_remove (s5r->header_head,
                                 s5r->header_tail,
                                 header);
    GNUNET_free (header->type);
    GNUNET_free (header->value);
    GNUNET_free (header);
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Finished request for %s\n",
              s5r->url);
  GNUNET_free (s5r->url);
  s5r->state = SOCKS5_SOCKET_WITH_MHD;
  s5r->url = NULL;
  s5r->response = NULL;
  *con_cls = NULL;
}

References Socks5Request::curl, curl_download_prepare(), curl_failure_response, curl_multi, GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_free, GNUNET_log, Socks5Request::header_head, Socks5Request::header_tail, Socks5Request::headers, Socks5Request::io_len, Socks5Request::rbuf_len, Socks5Request::response, SOCKS5_SOCKET_WITH_MHD, Socks5Request::state, Socks5Request::url, and Socks5Request::wbuf_len.

Referenced by lookup_ssl_httpd(), and run().

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mhd_connection_cb()

static void mhd_connection_cb ( void *  cls, struct MHD_Connection *  connection, void **  con_cls, enum MHD_ConnectionNotificationCode  cnc  )

static

Function called when MHD connection is opened or closed.

Parameters

cls	NULL
connection	connection handle
con_cls	value as set by the last call to the MHD_AccessHandlerCallback, should be our struct Socks5Request *
toe	connection notification type

Definition at line 2339 of file gnunet-gns-proxy.c.

{
  struct Socks5Request *s5r;
  const union MHD_ConnectionInfo *ci;
  int sock;
 
  switch (cnc)
  {
  case MHD_CONNECTION_NOTIFY_STARTED:
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connection started...\n");
    ci = MHD_get_connection_info (connection,
                                  MHD_CONNECTION_INFO_CONNECTION_FD);
    if (NULL == ci)
    {
      GNUNET_break (0);
      return;
    }
    sock = ci->connect_fd;
    for (s5r = s5r_head; NULL != s5r; s5r = s5r->next)
    {
      if (GNUNET_NETWORK_get_fd (s5r->sock) == sock)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                    "Context set...\n");
        s5r->ssl_checked = GNUNET_NO;
        *con_cls = s5r;
        break;
      }
    }
    break;
 
  case MHD_CONNECTION_NOTIFY_CLOSED:
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Connection closed... cleaning up\n");
    s5r = *con_cls;
    if (NULL == s5r)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Connection stale!\n");
      return;
    }
    cleanup_s5r (s5r);
    curl_download_prepare ();
    *con_cls = NULL;
    break;
 
  default:
    GNUNET_break (0);
  }
}

References cleanup_s5r(), curl_download_prepare(), GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_NETWORK_get_fd(), GNUNET_NO, Socks5Request::next, s5r_head, Socks5Request::sock, and Socks5Request::ssl_checked.

Referenced by lookup_ssl_httpd(), and run().

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mhd_log_callback()

static void * mhd_log_callback ( void *  cls, const char *  url, struct MHD_Connection *  connection  )

static

Function called when MHD first processes an incoming connection.

Gives us the respective URI information.

We use this to associate the struct MHD_Connection with our internal struct Socks5Request data structure (by checking for matching sockets).

Parameters

cls	the HTTP server handle (a struct MhdHttpList)
url	the URL that is being requested
connection	MHD connection object for the request

Returns

the struct Socks5Request that this connection is for

Definition at line 2408 of file gnunet-gns-proxy.c.

{
  struct Socks5Request *s5r;
  const union MHD_ConnectionInfo *ci;
 
  ci = MHD_get_connection_info (connection,
                                MHD_CONNECTION_INFO_SOCKET_CONTEXT);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Processing %s\n", url);
  if (NULL == ci)
  {
    GNUNET_break (0);
    return NULL;
  }
  s5r = ci->socket_context;
  if (NULL != s5r->url)
  {
    GNUNET_break (0);
    return NULL;
  }
  s5r->url = GNUNET_strdup (url);
  if (NULL != s5r->timeout_task)
  {
    GNUNET_SCHEDULER_cancel (s5r->timeout_task);
    s5r->timeout_task = NULL;
  }
  GNUNET_assert (s5r->state == SOCKS5_SOCKET_WITH_MHD);
  return s5r;
}

References GNUNET_assert, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_SCHEDULER_cancel(), GNUNET_strdup, SOCKS5_SOCKET_WITH_MHD, Socks5Request::state, Socks5Request::timeout_task, and Socks5Request::url.

Referenced by lookup_ssl_httpd(), and run().

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kill_httpd()

static void kill_httpd ( struct MhdHttpList *  hd )

static

Kill the given MHD daemon.

Parameters

hd	daemon to stop

Definition at line 2446 of file gnunet-gns-proxy.c.

{
  GNUNET_CONTAINER_DLL_remove (mhd_httpd_head,
                               mhd_httpd_tail,
                               hd);
  GNUNET_free (hd->domain);
  MHD_stop_daemon (hd->daemon);
  if (NULL != hd->httpd_task)
  {
    GNUNET_SCHEDULER_cancel (hd->httpd_task);
    hd->httpd_task = NULL;
  }
  GNUNET_free (hd->proxy_cert);
  if (hd == httpd)
    httpd = NULL;
  GNUNET_free (hd);
}

References MhdHttpList::daemon, MhdHttpList::domain, GNUNET_CONTAINER_DLL_remove, GNUNET_free, GNUNET_SCHEDULER_cancel(), httpd, MhdHttpList::httpd_task, mhd_httpd_head, mhd_httpd_tail, and MhdHttpList::proxy_cert.

Referenced by do_shutdown(), kill_httpd_task(), and schedule_httpd().

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kill_httpd_task()

static void kill_httpd_task ( void *  cls )

static

Task run whenever HTTP server is idle for too long.

Kill it.

Parameters

cls	the struct MhdHttpList *

Definition at line 2471 of file gnunet-gns-proxy.c.

{
  struct MhdHttpList *hd = cls;
 
  hd->httpd_task = NULL;
  kill_httpd (hd);
}

References MhdHttpList::httpd_task, and kill_httpd().

Referenced by schedule_httpd().

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do_httpd()

static void do_httpd ( void *  cls )

static

Task run whenever HTTP server operations are pending.

Parameters

cls	the struct MhdHttpList * of the daemon that is being run

Definition at line 2570 of file gnunet-gns-proxy.c.

{
  struct MhdHttpList *hd = cls;
 
  hd->httpd_task = NULL;
  MHD_run (hd->daemon);
  schedule_httpd (hd);
}

References MhdHttpList::daemon, MhdHttpList::httpd_task, and schedule_httpd().

Referenced by run_mhd_now(), and schedule_httpd().

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schedule_httpd()

static void schedule_httpd ( struct MhdHttpList *  hd )

static

Schedule MHD.

This function should be called initially when an MHD is first getting its client socket, and will then automatically always be called later whenever there is work to be done.

Parameters

hd	the daemon to schedule

Definition at line 2497 of file gnunet-gns-proxy.c.

{
  fd_set rs;
  fd_set ws;
  fd_set es;
  struct GNUNET_NETWORK_FDSet *wrs;
  struct GNUNET_NETWORK_FDSet *wws;
  int max;
  int haveto;
  MHD_UNSIGNED_LONG_LONG timeout;
  struct GNUNET_TIME_Relative tv;
 
  FD_ZERO (&rs);
  FD_ZERO (&ws);
  FD_ZERO (&es);
  max = -1;
  if (MHD_YES !=
      MHD_get_fdset (hd->daemon,
                     &rs,
                     &ws,
                     &es,
                     &max))
  {
    kill_httpd (hd);
    return;
  }
  haveto = MHD_get_timeout (hd->daemon,
                            &timeout);
  if (MHD_YES == haveto)
    tv.rel_value_us = (uint64_t) timeout * 1000LL;
  else
    tv = GNUNET_TIME_UNIT_FOREVER_REL;
  if (-1 != max)
  {
    wrs = GNUNET_NETWORK_fdset_create ();
    wws = GNUNET_NETWORK_fdset_create ();
    GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
    GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
  }
  else
  {
    wrs = NULL;
    wws = NULL;
  }
  if (NULL != hd->httpd_task)
  {
    GNUNET_SCHEDULER_cancel (hd->httpd_task);
    hd->httpd_task = NULL;
  }
  if ((MHD_YES != haveto) &&
      (-1 == max) &&
      (hd != httpd))
  {
    /* daemon is idle, kill after timeout */
    hd->httpd_task = GNUNET_SCHEDULER_add_delayed (MHD_CACHE_TIMEOUT,
                                                   &kill_httpd_task,
                                                   hd);
  }
  else
  {
    hd->httpd_task =
      GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
                                   tv, wrs, wws,
                                   &do_httpd, hd);
  }
  if (NULL != wrs)
    GNUNET_NETWORK_fdset_destroy (wrs);
  if (NULL != wws)
    GNUNET_NETWORK_fdset_destroy (wws);
}

References MhdHttpList::daemon, do_httpd(), GNUNET_NETWORK_fdset_copy_native(), GNUNET_NETWORK_fdset_create(), GNUNET_NETWORK_fdset_destroy(), GNUNET_SCHEDULER_add_delayed(), GNUNET_SCHEDULER_add_select(), GNUNET_SCHEDULER_cancel(), GNUNET_SCHEDULER_PRIORITY_DEFAULT, GNUNET_TIME_UNIT_FOREVER_REL, httpd, MhdHttpList::httpd_task, kill_httpd(), kill_httpd_task(), max, MHD_CACHE_TIMEOUT, GNUNET_TIME_Relative::rel_value_us, and timeout.

Referenced by do_httpd(), and setup_data_transfer().

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load_file()

static void * load_file ( const char *  filename, unsigned int *  size  )

static

Read file in filename.

Parameters

filename	file to read
size	pointer where filesize is stored

Returns

NULL on error

Definition at line 2603 of file gnunet-gns-proxy.c.

{
  void *buffer;
  uint64_t fsize;
 
  if (GNUNET_OK !=
      GNUNET_DISK_file_size (filename,
                             &fsize,
                             GNUNET_YES,
                             GNUNET_YES))
    return NULL;
  if (fsize > MAX_PEM_SIZE)
    return NULL;
  *size = (unsigned int) fsize;
  buffer = GNUNET_malloc (*size);
  if (fsize !=
      GNUNET_DISK_fn_read (filename,
                           buffer,
                           (size_t) fsize))
  {
    GNUNET_free (buffer);
    return NULL;
  }
  return buffer;
}

References filename, GNUNET_DISK_file_size(), GNUNET_DISK_fn_read(), GNUNET_free, GNUNET_malloc, GNUNET_OK, GNUNET_YES, consensus-simulation::int, MAX_PEM_SIZE, and size.

Referenced by load_cert_from_file(), and load_key_from_file().

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load_key_from_file()

static int load_key_from_file ( gnutls_x509_privkey_t  key, const char *  keyfile  )

static

Load PEM key from file.

Parameters

key	where to store the data
keyfile	path to the PEM file

Returns

GNUNET_OK on success

Definition at line 2639 of file gnunet-gns-proxy.c.

{
  gnutls_datum_t key_data;
  int ret;
 
  key_data.data = load_file (keyfile,
                             &key_data.size);
  if (NULL == key_data.data)
    return GNUNET_SYSERR;
  ret = gnutls_x509_privkey_import (key, &key_data,
                                    GNUTLS_X509_FMT_PEM);
  if (GNUTLS_E_SUCCESS != ret)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _ ("Unable to import private key from file `%s'\n"),
                keyfile);
  }
  GNUNET_free (key_data.data);
  return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
}

References _, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_OK, GNUNET_SYSERR, key, load_file(), and ret.

Referenced by run().

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load_cert_from_file()

static int load_cert_from_file ( gnutls_x509_crt_t  crt, const char *  certfile  )

static

Load cert from file.

Parameters

crt	struct to store data in
certfile	path to pem file

Returns

GNUNET_OK on success

Definition at line 2670 of file gnunet-gns-proxy.c.

{
  gnutls_datum_t cert_data;
  int ret;
 
  cert_data.data = load_file (certfile,
                              &cert_data.size);
  if (NULL == cert_data.data)
    return GNUNET_SYSERR;
  ret = gnutls_x509_crt_import (crt,
                                &cert_data,
                                GNUTLS_X509_FMT_PEM);
  if (GNUTLS_E_SUCCESS != ret)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _ ("Unable to import certificate from `%s'\n"),
                certfile);
  }
  GNUNET_free (cert_data.data);
  return (GNUTLS_E_SUCCESS != ret) ? GNUNET_SYSERR : GNUNET_OK;
}

References _, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_OK, GNUNET_SYSERR, load_file(), and ret.

Referenced by run().

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generate_gns_certificate()

static struct ProxyGNSCertificate * generate_gns_certificate ( const char *  name )

static

Generate new certificate for specific name.

Parameters

name	the subject name to generate a cert for

Returns

a struct holding the PEM data, NULL on error

Definition at line 2701 of file gnunet-gns-proxy.c.

{
  unsigned int serial;
  size_t key_buf_size;
  size_t cert_buf_size;
  gnutls_x509_crt_t request;
  time_t etime;
  struct tm *tm_data;
  struct ProxyGNSCertificate *pgc;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Generating x.509 certificate for `%s'\n",
              name);
  GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_init (&request));
  GNUNET_break (GNUTLS_E_SUCCESS == gnutls_x509_crt_set_key (request,
                                                             proxy_ca.key));
  pgc = GNUNET_new (struct ProxyGNSCertificate);
  gnutls_x509_crt_set_dn_by_oid (request,
                                 GNUTLS_OID_X520_COUNTRY_NAME,
                                 0,
                                 "ZZ",
                                 strlen ("ZZ"));
  gnutls_x509_crt_set_dn_by_oid (request,
                                 GNUTLS_OID_X520_ORGANIZATION_NAME,
                                 0,
                                 "GNU Name System",
                                 strlen ("GNU Name System"));
  gnutls_x509_crt_set_dn_by_oid (request,
                                 GNUTLS_OID_X520_COMMON_NAME,
                                 0,
                                 name,
                                 strlen (name));
  gnutls_x509_crt_set_subject_alternative_name (request,
                                                GNUTLS_SAN_DNSNAME,
                                                name);
  GNUNET_break (GNUTLS_E_SUCCESS ==
                gnutls_x509_crt_set_version (request,
                                             3));
  gnutls_rnd (GNUTLS_RND_NONCE,
              &serial,
              sizeof(serial));
  gnutls_x509_crt_set_serial (request,
                              &serial,
                              sizeof(serial));
  etime = time (NULL);
  tm_data = localtime (&etime);
  tm_data->tm_hour--;
  etime = mktime (tm_data);
  gnutls_x509_crt_set_activation_time (request,
                                       etime);
  tm_data->tm_year++;
  etime = mktime (tm_data);
  gnutls_x509_crt_set_expiration_time (request,
                                       etime);
  gnutls_x509_crt_sign2 (request,
                         proxy_ca.cert,
                         proxy_ca.key,
                         GNUTLS_DIG_SHA512,
                         0);
  key_buf_size = sizeof(pgc->key);
  cert_buf_size = sizeof(pgc->cert);
  gnutls_x509_crt_export (request,
                          GNUTLS_X509_FMT_PEM,
                          pgc->cert,
                          &cert_buf_size);
  gnutls_x509_privkey_export (proxy_ca.key,
                              GNUTLS_X509_FMT_PEM,
                              pgc->key,
                              &key_buf_size);
  gnutls_x509_crt_deinit (request);
  return pgc;
}

References ProxyCA::cert, ProxyGNSCertificate::cert, etime, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_new, ProxyCA::key, ProxyGNSCertificate::key, name, proxy_ca, and request.

Referenced by lookup_ssl_httpd().

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mhd_error_log_callback()

static void mhd_error_log_callback ( void *  cls, const char *  fm, va_list  ap  )

static

Function called by MHD with errors, suppresses them all.

Parameters

cls	closure
fm	format string (printf()-style)
ap	arguments to fm

Definition at line 2783 of file gnunet-gns-proxy.c.

{
  /* do nothing */
}

Referenced by lookup_ssl_httpd().

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lookup_ssl_httpd()

static struct MhdHttpList * lookup_ssl_httpd ( const char *  domain )

static

Lookup (or create) an TLS MHD instance for a particular domain.

Parameters

domain

the domain the TLS daemon has to serve

Returns

NULL on error

Definition at line 2798 of file gnunet-gns-proxy.c.

{
  struct MhdHttpList *hd;
  struct ProxyGNSCertificate *pgc;
 
  if (NULL == domain)
  {
    GNUNET_break (0);
    return NULL;
  }
  for (hd = mhd_httpd_head; NULL != hd; hd = hd->next)
    if ((NULL != hd->domain) &&
        (0 == strcmp (hd->domain, domain)))
      return hd;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Starting fresh MHD HTTPS instance for domain `%s'\n",
              domain);
  pgc = generate_gns_certificate (domain);
  hd = GNUNET_new (struct MhdHttpList);
  hd->is_ssl = GNUNET_YES;
  hd->domain = GNUNET_strdup (domain);
  hd->proxy_cert = pgc;
  hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_SSL
                                 | MHD_USE_NO_LISTEN_SOCKET
                                 | MHD_ALLOW_SUSPEND_RESUME,
                                 0,
                                 NULL, NULL,
                                 &create_response, hd,
                                 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned
                                                                 int) 16,
                                 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb,
                                 NULL,
                                 MHD_OPTION_NOTIFY_CONNECTION,
                                 &mhd_connection_cb, NULL,
                                 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback,
                                 NULL,
                                 MHD_OPTION_EXTERNAL_LOGGER,
                                 &mhd_error_log_callback, NULL,
                                 MHD_OPTION_HTTPS_MEM_KEY, pgc->key,
                                 MHD_OPTION_HTTPS_MEM_CERT, pgc->cert,
                                 MHD_OPTION_END);
  if (NULL == hd->daemon)
  {
    GNUNET_free (pgc);
    GNUNET_free (hd);
    return NULL;
  }
  GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
                               mhd_httpd_tail,
                               hd);
  return hd;
}

References ProxyGNSCertificate::cert, create_response(), MhdHttpList::daemon, MhdHttpList::domain, generate_gns_certificate(), GNUNET_break, GNUNET_CONTAINER_DLL_insert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_new, GNUNET_strdup, GNUNET_YES, MhdHttpList::is_ssl, ProxyGNSCertificate::key, mhd_completed_cb(), mhd_connection_cb(), mhd_error_log_callback(), mhd_httpd_head, mhd_httpd_tail, mhd_log_callback(), MhdHttpList::next, and MhdHttpList::proxy_cert.

Referenced by setup_data_transfer().

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timeout_s5r_handshake()

static void timeout_s5r_handshake ( void *  cls )

static

Task run when a Socks5Request somehow fails to be associated with an MHD connection (e.g.

because the client never speaks HTTP after the SOCKS5 handshake). Clean up.

Parameters

cls	the struct Socks5Request *

Definition at line 2860 of file gnunet-gns-proxy.c.

{
  struct Socks5Request *s5r = cls;
 
  s5r->timeout_task = NULL;
  cleanup_s5r (s5r);
}

References cleanup_s5r(), and Socks5Request::timeout_task.

Referenced by setup_data_transfer().

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setup_data_transfer()

static void setup_data_transfer ( struct Socks5Request *  s5r )

static

We're done with the Socks5 protocol, now we need to pass the connection data through to the final destination, either direct (if the protocol might not be HTTP), or via MHD (if the port looks like it should be HTTP).

Parameters

s5r	socks request that has reached the final stage

Definition at line 2878 of file gnunet-gns-proxy.c.

{
  struct MhdHttpList *hd;
  int fd;
  const struct sockaddr *addr;
  socklen_t len;
  char *domain;
 
  if (GNUNET_YES == s5r->is_tls)
  {
    GNUNET_asprintf (&domain,
                     "%s",
                     s5r->domain);
    hd = lookup_ssl_httpd (domain);
    if (NULL == hd)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  _ ("Failed to start HTTPS server for `%s'\n"),
                  s5r->domain);
      cleanup_s5r (s5r);
      GNUNET_free (domain);
      return;
    }
  }
  else
  {
    domain = NULL;
    GNUNET_assert (NULL != httpd);
    hd = httpd;
  }
  fd = GNUNET_NETWORK_get_fd (s5r->sock);
  addr = GNUNET_NETWORK_get_addr (s5r->sock);
  len = GNUNET_NETWORK_get_addrlen (s5r->sock);
  s5r->state = SOCKS5_SOCKET_WITH_MHD;
  if (MHD_YES !=
      MHD_add_connection (hd->daemon,
                          fd,
                          addr,
                          len))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                _ ("Failed to pass client to MHD\n"));
    cleanup_s5r (s5r);
    GNUNET_free (domain);
    return;
  }
  s5r->hd = hd;
  schedule_httpd (hd);
  s5r->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_HANDSHAKE_TIMEOUT,
                                                    &timeout_s5r_handshake,
                                                    s5r);
  GNUNET_free (domain);
}

References _, cleanup_s5r(), MhdHttpList::daemon, Socks5Request::domain, GNUNET_asprintf(), GNUNET_assert, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_NETWORK_get_addr(), GNUNET_NETWORK_get_addrlen(), GNUNET_NETWORK_get_fd(), GNUNET_SCHEDULER_add_delayed(), GNUNET_YES, Socks5Request::hd, HTTP_HANDSHAKE_TIMEOUT, httpd, Socks5Request::is_tls, lookup_ssl_httpd(), schedule_httpd(), Socks5Request::sock, SOCKS5_SOCKET_WITH_MHD, Socks5Request::state, timeout_s5r_handshake(), and Socks5Request::timeout_task.

Referenced by do_write().

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do_write()

static void do_write ( void *  cls )

static

Write data from buffer to socks5 client, then continue with state machine.

Parameters

cls	the closure with the struct Socks5Request

Definition at line 2942 of file gnunet-gns-proxy.c.

{
  struct Socks5Request *s5r = cls;
  ssize_t len;
 
  s5r->wtask = NULL;
  len = GNUNET_NETWORK_socket_send (s5r->sock,
                                    s5r->wbuf,
                                    s5r->wbuf_len);
  if (len <= 0)
  {
    /* write error: connection closed, shutdown, etc.; just clean up */
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Write Error\n");
    cleanup_s5r (s5r);
    return;
  }
  memmove (s5r->wbuf,
           &s5r->wbuf[len],
           s5r->wbuf_len - len);
  s5r->wbuf_len -= len;
  if (s5r->wbuf_len > 0)
  {
    /* not done writing */
    s5r->wtask =
      GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                      s5r->sock,
                                      &do_write, s5r);
    return;
  }
 
  /* we're done writing, continue with state machine! */
 
  switch (s5r->state)
  {
  case SOCKS5_INIT:
    GNUNET_assert (0);
    break;
 
  case SOCKS5_REQUEST:
    GNUNET_assert (NULL != s5r->rtask);
    break;
 
  case SOCKS5_DATA_TRANSFER:
    setup_data_transfer (s5r);
    return;
 
  case SOCKS5_WRITE_THEN_CLEANUP:
    cleanup_s5r (s5r);
    return;
 
  default:
    GNUNET_break (0);
    break;
  }
}

References cleanup_s5r(), do_write(), GNUNET_assert, GNUNET_break, GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_NETWORK_socket_send(), GNUNET_SCHEDULER_add_write_net(), GNUNET_TIME_UNIT_FOREVER_REL, Socks5Request::rtask, setup_data_transfer(), Socks5Request::sock, SOCKS5_DATA_TRANSFER, SOCKS5_INIT, SOCKS5_REQUEST, SOCKS5_WRITE_THEN_CLEANUP, Socks5Request::state, Socks5Request::wbuf, Socks5Request::wbuf_len, and Socks5Request::wtask.

Referenced by do_s5r_read(), do_write(), signal_socks_failure(), and signal_socks_success().

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signal_socks_failure()

static void signal_socks_failure ( struct Socks5Request *  s5r, enum Socks5StatusCode  sc  )

static

Return a server response message indicating a failure to the client.

Parameters

s5r	request to return failure code for
sc	status code to return

Definition at line 3007 of file gnunet-gns-proxy.c.

{
  struct Socks5ServerResponseMessage *s_resp;
 
  GNUNET_break (0 == s5r->wbuf_len); /* Should happen first in any transmission, right? */
  GNUNET_assert (SOCKS_BUFFERSIZE - s5r->wbuf_len >=
                 sizeof(struct Socks5ServerResponseMessage));
  s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
  memset (s_resp, 0, sizeof(struct Socks5ServerResponseMessage));
  s_resp->version = SOCKS_VERSION_5;
  s_resp->reply = sc;
  s5r->state = SOCKS5_WRITE_THEN_CLEANUP;
  if (NULL != s5r->wtask)
    s5r->wtask =
      GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                      s5r->sock,
                                      &do_write, s5r);
}

References do_write(), GNUNET_assert, GNUNET_break, GNUNET_SCHEDULER_add_write_net(), GNUNET_TIME_UNIT_FOREVER_REL, Socks5ServerResponseMessage::reply, sc, Socks5Request::sock, SOCKS5_WRITE_THEN_CLEANUP, SOCKS_BUFFERSIZE, SOCKS_VERSION_5, Socks5Request::state, Socks5ServerResponseMessage::version, Socks5Request::wbuf, Socks5Request::wbuf_len, and Socks5Request::wtask.

Referenced by do_s5r_read(), and handle_gns_result().

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signal_socks_success()

static void signal_socks_success ( struct Socks5Request *  s5r )

static

Return a server response message indicating success.

Parameters

s5r	request to return success status message for

Definition at line 3034 of file gnunet-gns-proxy.c.

{
  struct Socks5ServerResponseMessage *s_resp;
 
  s_resp = (struct Socks5ServerResponseMessage *) &s5r->wbuf[s5r->wbuf_len];
  s_resp->version = SOCKS_VERSION_5;
  s_resp->reply = SOCKS5_STATUS_REQUEST_GRANTED;
  s_resp->reserved = 0;
  s_resp->addr_type = SOCKS5_AT_IPV4;
  /* zero out IPv4 address and port */
  memset (&s_resp[1],
          0,
          sizeof(struct in_addr) + sizeof(uint16_t));
  s5r->wbuf_len += sizeof(struct Socks5ServerResponseMessage)
                   + sizeof(struct in_addr) + sizeof(uint16_t);
  if (NULL == s5r->wtask)
    s5r->wtask =
      GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                      s5r->sock,
                                      &do_write, s5r);
}

References Socks5ServerResponseMessage::addr_type, do_write(), GNUNET_SCHEDULER_add_write_net(), GNUNET_TIME_UNIT_FOREVER_REL, Socks5ServerResponseMessage::reply, Socks5ServerResponseMessage::reserved, Socks5Request::sock, SOCKS5_AT_IPV4, SOCKS5_STATUS_REQUEST_GRANTED, SOCKS_VERSION_5, Socks5ServerResponseMessage::version, Socks5Request::wbuf, Socks5Request::wbuf_len, and Socks5Request::wtask.

Referenced by do_s5r_read(), and handle_gns_result().

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handle_gns_result()

static void handle_gns_result ( void *  cls, int  tld, uint32_t  rd_count, const struct GNUNET_GNSRECORD_Data *  rd  )

static

Process GNS results for target domain.

Parameters

cls	the struct Socks5Request *
tld	GNUNET_YES if this was a GNS TLD.
rd_count	number of records returned
rd	record data

Definition at line 3066 of file gnunet-gns-proxy.c.

{
  struct Socks5Request *s5r = cls;
  const struct GNUNET_GNSRECORD_Data *r;
  int got_ip;
 
  s5r->gns_lookup = NULL;
  s5r->is_gns = tld;
  got_ip = GNUNET_NO;
  for (uint32_t i = 0; i < rd_count; i++)
  {
    r = &rd[i];
    switch (r->record_type)
    {
    case GNUNET_DNSPARSER_TYPE_A:
      {
        struct sockaddr_in *in;
 
        if (sizeof(struct in_addr) != r->data_size)
        {
          GNUNET_break_op (0);
          break;
        }
        if (GNUNET_YES == got_ip)
          break;
        if (GNUNET_OK !=
            GNUNET_NETWORK_test_pf (PF_INET))
          break;
        got_ip = GNUNET_YES;
        in = (struct sockaddr_in *) &s5r->destination_address;
        in->sin_family = AF_INET;
        GNUNET_memcpy (&in->sin_addr,
                       r->data,
                       r->data_size);
        in->sin_port = htons (s5r->port);
#if HAVE_SOCKADDR_IN_SIN_LEN
        in->sin_len = sizeof(*in);
#endif
      }
      break;
 
    case GNUNET_DNSPARSER_TYPE_AAAA:
      {
        struct sockaddr_in6 *in;
 
        if (sizeof(struct in6_addr) != r->data_size)
        {
          GNUNET_break_op (0);
          break;
        }
        if (GNUNET_YES == got_ip)
          break;
        if (GNUNET_YES == disable_v6)
          break;
        if (GNUNET_OK !=
            GNUNET_NETWORK_test_pf (PF_INET6))
          break;
        /* FIXME: allow user to disable IPv6 per configuration option... */
        got_ip = GNUNET_YES;
        in = (struct sockaddr_in6 *) &s5r->destination_address;
        in->sin6_family = AF_INET6;
        GNUNET_memcpy (&in->sin6_addr,
                       r->data,
                       r->data_size);
        in->sin6_port = htons (s5r->port);
#if HAVE_SOCKADDR_IN_SIN_LEN
        in->sin6_len = sizeof(*in);
#endif
      }
      break;
 
    case GNUNET_GNSRECORD_TYPE_VPN:
      GNUNET_break (0);    /* should have been translated within GNS */
      break;
 
    case GNUNET_GNSRECORD_TYPE_LEHO:
      GNUNET_free (s5r->leho);
      s5r->leho = GNUNET_strndup (r->data,
                                  r->data_size);
      break;
 
    case GNUNET_GNSRECORD_TYPE_BOX:
      {
        const struct GNUNET_GNSRECORD_BoxRecord *box;
 
        if (r->data_size < sizeof(struct GNUNET_GNSRECORD_BoxRecord))
        {
          GNUNET_break_op (0);
          break;
        }
        box = r->data;
        if ((ntohl (box->record_type) != GNUNET_DNSPARSER_TYPE_TLSA) ||
            (ntohs (box->protocol) != IPPROTO_TCP) ||
            (ntohs (box->service) != s5r->port))
          break;   /* BOX record does not apply */
        if (s5r->num_danes >= MAX_DANES)
        {
          GNUNET_break (0);     /* MAX_DANES too small */
          break;
        }
        s5r->is_tls = GNUNET_YES;   /* This should be TLS */
        s5r->dane_data_len[s5r->num_danes]
          = r->data_size - sizeof(struct GNUNET_GNSRECORD_BoxRecord);
        s5r->dane_data[s5r->num_danes]
          = GNUNET_memdup (&box[1],
                           s5r->dane_data_len[s5r->num_danes]);
        s5r->num_danes++;
        break;
      }
 
    default:
      /* don't care */
      break;
    }
  }
  if ((GNUNET_YES != got_ip) &&
      (GNUNET_YES == tld))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Name resolution failed to yield useful IP address.\n");
    signal_socks_failure (s5r,
                          SOCKS5_STATUS_GENERAL_FAILURE);
    return;
  }
  s5r->state = SOCKS5_DATA_TRANSFER;
  signal_socks_success (s5r);
}

References Socks5Request::dane_data, Socks5Request::dane_data_len, GNUNET_GNSRECORD_Data::data, GNUNET_GNSRECORD_Data::data_size, Socks5Request::destination_address, disable_v6, Socks5Request::gns_lookup, GNUNET_break, GNUNET_break_op, GNUNET_DNSPARSER_TYPE_A, GNUNET_DNSPARSER_TYPE_AAAA, GNUNET_DNSPARSER_TYPE_TLSA, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_GNSRECORD_TYPE_BOX, GNUNET_GNSRECORD_TYPE_LEHO, GNUNET_GNSRECORD_TYPE_VPN, GNUNET_log, GNUNET_memcpy, GNUNET_memdup, GNUNET_NETWORK_test_pf(), GNUNET_NO, GNUNET_OK, GNUNET_strndup, GNUNET_YES, Socks5Request::is_gns, Socks5Request::is_tls, Socks5Request::leho, MAX_DANES, Socks5Request::num_danes, Socks5Request::port, GNUNET_GNSRECORD_BoxRecord::protocol, rd, rd_count, GNUNET_GNSRECORD_Data::record_type, GNUNET_GNSRECORD_BoxRecord::record_type, GNUNET_GNSRECORD_BoxRecord::service, signal_socks_failure(), signal_socks_success(), SOCKS5_DATA_TRANSFER, SOCKS5_STATUS_GENERAL_FAILURE, and Socks5Request::state.

Referenced by do_s5r_read().

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clear_from_s5r_rbuf()

static void clear_from_s5r_rbuf ( struct Socks5Request *  s5r, size_t  len  )

static

Remove the first len bytes from the beginning of the read buffer.

Parameters

s5r	the handle clear the read buffer for
len	number of bytes in read buffer to advance

Definition at line 3205 of file gnunet-gns-proxy.c.

{
  GNUNET_assert (len <= s5r->rbuf_len);
  memmove (s5r->rbuf,
           &s5r->rbuf[len],
           s5r->rbuf_len - len);
  s5r->rbuf_len -= len;
}

References GNUNET_assert, Socks5Request::rbuf, and Socks5Request::rbuf_len.

Referenced by do_s5r_read().

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do_s5r_read()

static void do_s5r_read ( void *  cls )

static

Read data from incoming Socks5 connection.

Parameters

cls	the closure with the struct Socks5Request

Definition at line 3222 of file gnunet-gns-proxy.c.

{
  struct Socks5Request *s5r = cls;
  const struct Socks5ClientHelloMessage *c_hello;
  struct Socks5ServerHelloMessage *s_hello;
  const struct Socks5ClientRequestMessage *c_req;
  ssize_t rlen;
  size_t alen;
  const struct GNUNET_SCHEDULER_TaskContext *tc;
 
  s5r->rtask = NULL;
  tc = GNUNET_SCHEDULER_get_task_context ();
  if ((NULL != tc->read_ready) &&
      (GNUNET_NETWORK_fdset_isset (tc->read_ready,
                                   s5r->sock)))
  {
    rlen = GNUNET_NETWORK_socket_recv (s5r->sock,
                                       &s5r->rbuf[s5r->rbuf_len],
                                       sizeof(s5r->rbuf) - s5r->rbuf_len);
    if (rlen <= 0)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "socks5 client disconnected.\n");
      cleanup_s5r (s5r);
      return;
    }
    s5r->rbuf_len += rlen;
  }
  s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                              s5r->sock,
                                              &do_s5r_read, s5r);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Processing %zu bytes of socks data in state %d\n",
              s5r->rbuf_len,
              s5r->state);
  switch (s5r->state)
  {
  case SOCKS5_INIT:
    c_hello = (const struct Socks5ClientHelloMessage*) &s5r->rbuf;
    if ((s5r->rbuf_len < sizeof(struct Socks5ClientHelloMessage)) ||
        (s5r->rbuf_len < sizeof(struct Socks5ClientHelloMessage)
         + c_hello->num_auth_methods))
      return;   /* need more data */
    if (SOCKS_VERSION_5 != c_hello->version)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  _ ("Unsupported socks version %d\n"),
                  (int) c_hello->version);
      cleanup_s5r (s5r);
      return;
    }
    clear_from_s5r_rbuf (s5r,
                         sizeof(struct Socks5ClientHelloMessage)
                         + c_hello->num_auth_methods);
    GNUNET_assert (0 == s5r->wbuf_len);
    s_hello = (struct Socks5ServerHelloMessage *) &s5r->wbuf;
    s5r->wbuf_len = sizeof(struct Socks5ServerHelloMessage);
    s_hello->version = SOCKS_VERSION_5;
    s_hello->auth_method = SOCKS_AUTH_NONE;
    GNUNET_assert (NULL == s5r->wtask);
    s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                                 s5r->sock,
                                                 &do_write, s5r);
    s5r->state = SOCKS5_REQUEST;
    return;
 
  case SOCKS5_REQUEST:
    c_req = (const struct Socks5ClientRequestMessage *) &s5r->rbuf;
    if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage))
      return;
    switch (c_req->command)
    {
    case SOCKS5_CMD_TCP_STREAM:
      /* handled below */
      break;
 
    default:
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  _ ("Unsupported socks command %d\n"),
                  (int) c_req->command);
      signal_socks_failure (s5r,
                            SOCKS5_STATUS_COMMAND_NOT_SUPPORTED);
      return;
    }
    switch (c_req->addr_type)
    {
    case SOCKS5_AT_IPV4:
      {
        const struct in_addr *v4 = (const struct in_addr *) &c_req[1];
        const uint16_t *port = (const uint16_t *) &v4[1];
        struct sockaddr_in *in;
 
        s5r->port = ntohs (*port);
        alen = sizeof(struct in_addr);
        if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage)
            + alen + sizeof(uint16_t))
          return;     /* need more data */
        in = (struct sockaddr_in *) &s5r->destination_address;
        in->sin_family = AF_INET;
        in->sin_addr = *v4;
        in->sin_port = *port;
#if HAVE_SOCKADDR_IN_SIN_LEN
        in->sin_len = sizeof(*in);
#endif
        s5r->state = SOCKS5_DATA_TRANSFER;
      }
      break;
 
    case SOCKS5_AT_IPV6:
      {
        const struct in6_addr *v6 = (const struct in6_addr *) &c_req[1];
        const uint16_t *port = (const uint16_t *) &v6[1];
        struct sockaddr_in6 *in;
 
        s5r->port = ntohs (*port);
        alen = sizeof(struct in6_addr);
        if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage)
            + alen + sizeof(uint16_t))
          return;     /* need more data */
        in = (struct sockaddr_in6 *) &s5r->destination_address;
        in->sin6_family = AF_INET6;
        in->sin6_addr = *v6;
        in->sin6_port = *port;
#if HAVE_SOCKADDR_IN_SIN_LEN
        in->sin6_len = sizeof(*in);
#endif
        s5r->state = SOCKS5_DATA_TRANSFER;
      }
      break;
 
    case SOCKS5_AT_DOMAINNAME:
      {
        const uint8_t *dom_len;
        const char *dom_name;
        const uint16_t *port;
 
        dom_len = (const uint8_t *) &c_req[1];
        alen = *dom_len + 1;
        if (s5r->rbuf_len < sizeof(struct Socks5ClientRequestMessage)
            + alen + sizeof(uint16_t))
          return;     /* need more data */
        dom_name = (const char *) &dom_len[1];
        port = (const uint16_t *) &dom_name[*dom_len];
        s5r->domain = GNUNET_strndup (dom_name,
                                      *dom_len);
        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                    "Requested connection is to %s:%d\n",
                    // (HTTPS_PORT == s5r->port) ? "s" : "",
                    s5r->domain,
                    ntohs (*port));
        s5r->state = SOCKS5_RESOLVING;
        s5r->port = ntohs (*port);
        s5r->is_tls = (HTTPS_PORT == s5r->port) ? GNUNET_YES : GNUNET_NO;
        s5r->gns_lookup = GNUNET_GNS_lookup_with_tld (gns_handle,
                                                      s5r->domain,
                                                      GNUNET_DNSPARSER_TYPE_A,
                                                      GNUNET_GNS_LO_LOCAL_MASTER /* only cached */,
                                                      &handle_gns_result,
                                                      s5r);
        break;
      }
 
    default:
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  _ ("Unsupported socks address type %d\n"),
                  (int) c_req->addr_type);
      signal_socks_failure (s5r,
                            SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED);
      return;
    }
    clear_from_s5r_rbuf (s5r,
                         sizeof(struct Socks5ClientRequestMessage)
                         + alen + sizeof(uint16_t));
    if (0 != s5r->rbuf_len)
    {
      /* read more bytes than healthy, why did the client send more!? */
      GNUNET_break_op (0);
      signal_socks_failure (s5r,
                            SOCKS5_STATUS_GENERAL_FAILURE);
      return;
    }
    if (SOCKS5_DATA_TRANSFER == s5r->state)
    {
      /* if we are not waiting for GNS resolution, signal success */
      signal_socks_success (s5r);
    }
    /* We are done reading right now */
    GNUNET_SCHEDULER_cancel (s5r->rtask);
    s5r->rtask = NULL;
    return;
 
  case SOCKS5_RESOLVING:
    GNUNET_assert (0);
    return;
 
  case SOCKS5_DATA_TRANSFER:
    GNUNET_assert (0);
    return;
 
  default:
    GNUNET_assert (0);
    return;
  }
}

References _, Socks5ClientRequestMessage::addr_type, Socks5ServerHelloMessage::auth_method, cleanup_s5r(), clear_from_s5r_rbuf(), Socks5ClientRequestMessage::command, Socks5Request::destination_address, do_s5r_read(), do_write(), Socks5Request::domain, gns_handle, Socks5Request::gns_lookup, GNUNET_assert, GNUNET_break_op, GNUNET_DNSPARSER_TYPE_A, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_GNS_LO_LOCAL_MASTER, GNUNET_GNS_lookup_with_tld(), GNUNET_log, GNUNET_NETWORK_fdset_isset(), GNUNET_NETWORK_socket_recv(), GNUNET_NO, GNUNET_SCHEDULER_add_read_net(), GNUNET_SCHEDULER_add_write_net(), GNUNET_SCHEDULER_cancel(), GNUNET_SCHEDULER_get_task_context(), GNUNET_strndup, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, handle_gns_result(), HTTPS_PORT, Socks5Request::is_tls, Socks5ClientHelloMessage::num_auth_methods, Socks5Request::port, port, Socks5Request::rbuf, Socks5Request::rbuf_len, GNUNET_SCHEDULER_TaskContext::read_ready, Socks5Request::rtask, signal_socks_failure(), signal_socks_success(), Socks5Request::sock, SOCKS5_AT_DOMAINNAME, SOCKS5_AT_IPV4, SOCKS5_AT_IPV6, SOCKS5_CMD_TCP_STREAM, SOCKS5_DATA_TRANSFER, SOCKS5_INIT, SOCKS5_REQUEST, SOCKS5_RESOLVING, SOCKS5_STATUS_ADDRESS_TYPE_NOT_SUPPORTED, SOCKS5_STATUS_COMMAND_NOT_SUPPORTED, SOCKS5_STATUS_GENERAL_FAILURE, SOCKS_AUTH_NONE, SOCKS_VERSION_5, Socks5Request::state, tc, Socks5ClientHelloMessage::version, Socks5ServerHelloMessage::version, Socks5Request::wbuf, Socks5Request::wbuf_len, and Socks5Request::wtask.

Referenced by do_accept(), and do_s5r_read().

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do_accept()

static void do_accept ( void *  cls )

static

Accept new incoming connections.

Parameters

cls	the closure with the lsock4 or lsock6

Definition at line 3434 of file gnunet-gns-proxy.c.

{
  struct GNUNET_NETWORK_Handle *lsock = cls;
  struct GNUNET_NETWORK_Handle *s;
  struct Socks5Request *s5r;
 
  GNUNET_assert (NULL != lsock);
  if (lsock == lsock4)
    ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                            lsock,
                                            &do_accept,
                                            lsock);
  else if (lsock == lsock6)
    ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                            lsock,
                                            &do_accept,
                                            lsock);
  else
    GNUNET_assert (0);
  s = GNUNET_NETWORK_socket_accept (lsock,
                                    NULL,
                                    NULL);
  if (NULL == s)
  {
    GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
                         "accept");
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Got an inbound connection, waiting for data\n");
  s5r = GNUNET_new (struct Socks5Request);
  GNUNET_CONTAINER_DLL_insert (s5r_head,
                               s5r_tail,
                               s5r);
  s5r->sock = s;
  s5r->state = SOCKS5_INIT;
  s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                              s5r->sock,
                                              &do_s5r_read,
                                              s5r);
}

References do_accept(), do_s5r_read(), GNUNET_assert, GNUNET_CONTAINER_DLL_insert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_log_strerror, GNUNET_NETWORK_socket_accept(), GNUNET_new, GNUNET_SCHEDULER_add_read_net(), GNUNET_TIME_UNIT_FOREVER_REL, lsock4, lsock6, ltask4, ltask6, Socks5Request::rtask, s5r_head, s5r_tail, Socks5Request::sock, SOCKS5_INIT, and Socks5Request::state.

Referenced by do_accept(), and run().

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do_shutdown()

static void do_shutdown ( void *  cls )

static

Task run on shutdown.

Parameters

cls

closure

Definition at line 3486 of file gnunet-gns-proxy.c.

{
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Shutting down...\n");
  /* MHD requires resuming before destroying the daemons */
  for (struct Socks5Request *s5r = s5r_head;
       NULL != s5r;
       s5r = s5r->next)
  {
    if (s5r->suspended)
    {
      s5r->suspended = GNUNET_NO;
      MHD_resume_connection (s5r->con);
    }
  }
  while (NULL != mhd_httpd_head)
    kill_httpd (mhd_httpd_head);
  while (NULL != s5r_head)
    cleanup_s5r (s5r_head);
  if (NULL != lsock4)
  {
    GNUNET_NETWORK_socket_close (lsock4);
    lsock4 = NULL;
  }
  if (NULL != lsock6)
  {
    GNUNET_NETWORK_socket_close (lsock6);
    lsock6 = NULL;
  }
  if (NULL != curl_multi)
  {
    curl_multi_cleanup (curl_multi);
    curl_multi = NULL;
  }
  if (NULL != gns_handle)
  {
    GNUNET_GNS_disconnect (gns_handle);
    gns_handle = NULL;
  }
  if (NULL != curl_download_task)
  {
    GNUNET_SCHEDULER_cancel (curl_download_task);
    curl_download_task = NULL;
  }
  if (NULL != ltask4)
  {
    GNUNET_SCHEDULER_cancel (ltask4);
    ltask4 = NULL;
  }
  if (NULL != ltask6)
  {
    GNUNET_SCHEDULER_cancel (ltask6);
    ltask6 = NULL;
  }
  gnutls_x509_crt_deinit (proxy_ca.cert);
  gnutls_x509_privkey_deinit (proxy_ca.key);
  gnutls_global_deinit ();
}

References ProxyCA::cert, cleanup_s5r(), curl_download_task, curl_multi, gns_handle, GNUNET_ERROR_TYPE_INFO, GNUNET_GNS_disconnect(), GNUNET_log, GNUNET_NETWORK_socket_close(), GNUNET_NO, GNUNET_SCHEDULER_cancel(), ProxyCA::key, kill_httpd(), lsock4, lsock6, ltask4, ltask6, mhd_httpd_head, Socks5Request::next, proxy_ca, and s5r_head.

Referenced by run().

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bind_v4()

static struct GNUNET_NETWORK_Handle * bind_v4 ( )

static

Create an IPv4 listen socket bound to our port.

Returns

NULL on error

Definition at line 3552 of file gnunet-gns-proxy.c.

{
  struct GNUNET_NETWORK_Handle *ls;
  struct sockaddr_in sa4;
  int eno;
 
  memset (&sa4, 0, sizeof(sa4));
  sa4.sin_family = AF_INET;
  sa4.sin_port = htons (port);
  sa4.sin_addr.s_addr = address;
#if HAVE_SOCKADDR_IN_SIN_LEN
  sa4.sin_len = sizeof(sa4);
#endif
  ls = GNUNET_NETWORK_socket_create (AF_INET,
                                     SOCK_STREAM,
                                     0);
  if (NULL == ls)
    return NULL;
  if (GNUNET_OK !=
      GNUNET_NETWORK_socket_bind (ls,
                                  (const struct sockaddr *) &sa4,
                                  sizeof(sa4)))
  {
    eno = errno;
    GNUNET_NETWORK_socket_close (ls);
    errno = eno;
    return NULL;
  }
  return ls;
}

References address, GNUNET_NETWORK_socket_bind(), GNUNET_NETWORK_socket_close(), GNUNET_NETWORK_socket_create(), GNUNET_OK, ls, and port.

Referenced by run().

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bind_v6()

static struct GNUNET_NETWORK_Handle * bind_v6 ( )

static

Create an IPv6 listen socket bound to our port.

Returns

NULL on error

Definition at line 3590 of file gnunet-gns-proxy.c.

{
  struct GNUNET_NETWORK_Handle *ls;
  struct sockaddr_in6 sa6;
  int eno;
 
  memset (&sa6, 0, sizeof(sa6));
  sa6.sin6_family = AF_INET6;
  sa6.sin6_port = htons (port);
  sa6.sin6_addr = address6;
#if HAVE_SOCKADDR_IN_SIN_LEN
  sa6.sin6_len = sizeof(sa6);
#endif
  ls = GNUNET_NETWORK_socket_create (AF_INET6,
                                     SOCK_STREAM,
                                     0);
  if (NULL == ls)
    return NULL;
  if (GNUNET_OK !=
      GNUNET_NETWORK_socket_bind (ls,
                                  (const struct sockaddr *) &sa6,
                                  sizeof(sa6)))
  {
    eno = errno;
    GNUNET_NETWORK_socket_close (ls);
    errno = eno;
    return NULL;
  }
  return ls;
}

References address6, GNUNET_NETWORK_socket_bind(), GNUNET_NETWORK_socket_close(), GNUNET_NETWORK_socket_create(), GNUNET_OK, ls, and port.

Referenced by run().

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run()

static void run ( void *  cls, char *const *  args, const char *  cfgfile, const struct GNUNET_CONFIGURATION_Handle *  c  )

static

Main function that will be run.

Parameters

cls	closure
args	remaining command-line arguments
cfgfile	name of the configuration file used (for saving, can be NULL!)
c	configuration

Definition at line 3631 of file gnunet-gns-proxy.c.

{
  char*cafile_cfg = NULL;
  char*cafile;
  char*addr_str;
  struct MhdHttpList *hd;
 
  cfg = c;
 
  /* Get address to bind to */
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg, "gns-proxy",
                                                          "BIND_TO",
                                                          &addr_str))
  {
    // No address specified
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Don't know what to bind to...\n");
    GNUNET_free (addr_str);
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  if (1 != inet_pton (AF_INET, addr_str, &address))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unable to parse address %s\n",
                addr_str);
    GNUNET_free (addr_str);
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  GNUNET_free (addr_str);
  /* Get address to bind to */
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg, "gns-proxy",
                                                          "BIND_TO6",
                                                          &addr_str))
  {
    // No address specified
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Don't know what to bind6 to...\n");
    GNUNET_free (addr_str);
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  if (1 != inet_pton (AF_INET6, addr_str, &address6))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unable to parse IPv6 address %s\n",
                addr_str);
    GNUNET_free (addr_str);
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  GNUNET_free (addr_str);
 
  if (NULL == (curl_multi = curl_multi_init ()))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to create cURL multi handle!\n");
    return;
  }
  cafile = cafile_opt;
  if (NULL == cafile)
  {
    if (GNUNET_OK !=
        GNUNET_CONFIGURATION_get_value_filename (cfg,
                                                 "gns-proxy",
                                                 "PROXY_CACERT",
                                                 &cafile_cfg))
    {
      GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
                                 "gns-proxy",
                                 "PROXY_CACERT");
      return;
    }
    cafile = cafile_cfg;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Using `%s' as CA\n",
              cafile);
 
  gnutls_global_init ();
  gnutls_x509_crt_init (&proxy_ca.cert);
  gnutls_x509_privkey_init (&proxy_ca.key);
 
  if ((GNUNET_OK !=
       load_cert_from_file (proxy_ca.cert,
                            cafile)) ||
      (GNUNET_OK !=
       load_key_from_file (proxy_ca.key,
                           cafile)))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _ ("Failed to load X.509 key and certificate from `%s'\n"),
                cafile);
    gnutls_x509_crt_deinit (proxy_ca.cert);
    gnutls_x509_privkey_deinit (proxy_ca.key);
    gnutls_global_deinit ();
    GNUNET_free (cafile_cfg);
    return;
  }
  GNUNET_free (cafile_cfg);
  if (NULL == (gns_handle = GNUNET_GNS_connect (cfg)))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unable to connect to GNS!\n");
    gnutls_x509_crt_deinit (proxy_ca.cert);
    gnutls_x509_privkey_deinit (proxy_ca.key);
    gnutls_global_deinit ();
    return;
  }
  GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
                                 NULL);
 
  /* Open listen socket for socks proxy */
  lsock6 = bind_v6 ();
  if (NULL == lsock6)
  {
    GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
                         "bind");
  }
  else
  {
    if (GNUNET_OK !=
        GNUNET_NETWORK_socket_listen (lsock6,
                                      5))
    {
      GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
                           "listen");
      GNUNET_NETWORK_socket_close (lsock6);
      lsock6 = NULL;
    }
    else
    {
      ltask6 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                              lsock6,
                                              &do_accept,
                                              lsock6);
    }
  }
  lsock4 = bind_v4 ();
  if (NULL == lsock4)
  {
    GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
                         "bind");
  }
  else
  {
    if (GNUNET_OK !=
        GNUNET_NETWORK_socket_listen (lsock4,
                                      5))
    {
      GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
                           "listen");
      GNUNET_NETWORK_socket_close (lsock4);
      lsock4 = NULL;
    }
    else
    {
      ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                              lsock4,
                                              &do_accept,
                                              lsock4);
    }
  }
  if ((NULL == lsock4) &&
      (NULL == lsock6))
  {
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  if (CURLSSLSET_OK != curl_global_sslset (CURLSSLBACKEND_GNUTLS,
                                           NULL,
                                           NULL))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "cURL does not support the GnuTLS backend\n");
 
  }
  if (0 != curl_global_init (CURL_GLOBAL_WIN32))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "cURL global init failed!\n");
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Proxy listens on port %u\n",
              (unsigned int) port);
 
  /* start MHD daemon for HTTP */
  hd = GNUNET_new (struct MhdHttpList);
  hd->daemon = MHD_start_daemon (MHD_USE_DEBUG | MHD_USE_NO_LISTEN_SOCKET
                                 | MHD_ALLOW_SUSPEND_RESUME,
                                 0,
                                 NULL, NULL,
                                 &create_response, hd,
                                 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned
                                                                 int) 16,
                                 MHD_OPTION_NOTIFY_COMPLETED, &mhd_completed_cb,
                                 NULL,
                                 MHD_OPTION_NOTIFY_CONNECTION,
                                 &mhd_connection_cb, NULL,
                                 MHD_OPTION_URI_LOG_CALLBACK, &mhd_log_callback,
                                 NULL,
                                 MHD_OPTION_END);
  if (NULL == hd->daemon)
  {
    GNUNET_free (hd);
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  httpd = hd;
  GNUNET_CONTAINER_DLL_insert (mhd_httpd_head,
                               mhd_httpd_tail,
                               hd);
}

References _, address, address6, bind_v4(), bind_v6(), cafile_opt, ProxyCA::cert, cfg, create_response(), curl_multi, MhdHttpList::daemon, do_accept(), do_shutdown(), gns_handle, GNUNET_CONFIGURATION_get_value_filename(), GNUNET_CONFIGURATION_get_value_string(), GNUNET_CONTAINER_DLL_insert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_GNS_connect(), GNUNET_log, GNUNET_log_config_missing(), GNUNET_log_strerror, GNUNET_NETWORK_socket_close(), GNUNET_NETWORK_socket_listen(), GNUNET_new, GNUNET_OK, GNUNET_SCHEDULER_add_read_net(), GNUNET_SCHEDULER_add_shutdown(), GNUNET_SCHEDULER_shutdown(), GNUNET_TIME_UNIT_FOREVER_REL, httpd, ProxyCA::key, load_cert_from_file(), load_key_from_file(), lsock4, lsock6, ltask4, ltask6, mhd_completed_cb(), mhd_connection_cb(), mhd_httpd_head, mhd_httpd_tail, mhd_log_callback(), port, and proxy_ca.

Referenced by main().

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main()

int main	(	int	argc,
		char *const *	argv
	)

The main function for gnunet-gns-proxy.

Parameters

argc	number of arguments from the command line
argv	command line arguments

Returns

0 ok, 1 on error

Definition at line 3860 of file gnunet-gns-proxy.c.

{
  struct GNUNET_GETOPT_CommandLineOption options[] = {
    GNUNET_GETOPT_option_uint16 ('p',
                                 "port",
                                 NULL,
                                 gettext_noop (
                                   "listen on specified port (default: 7777)"),
                                 &port),
    GNUNET_GETOPT_option_string ('a',
                                 "authority",
                                 NULL,
                                 gettext_noop ("pem file to use as CA"),
                                 &cafile_opt),
    GNUNET_GETOPT_option_flag ('6',
                               "disable-ivp6",
                               gettext_noop ("disable use of IPv6"),
                               &disable_v6),
 
    GNUNET_GETOPT_OPTION_END
  };
  static const char*page =
    "<html><head><title>gnunet-gns-proxy</title>"
    "</head><body>cURL fail</body></html>";
  int ret;
 
  if (GNUNET_OK !=
      GNUNET_STRINGS_get_utf8_args (argc, argv,
                                    &argc, &argv))
    return 2;
  GNUNET_log_setup ("gnunet-gns-proxy",
                    "WARNING",
                    NULL);
  curl_failure_response
    = MHD_create_response_from_buffer (strlen (page),
                                       (void *) page,
                                       MHD_RESPMEM_PERSISTENT);
 
  ret =
    (GNUNET_OK ==
     GNUNET_PROGRAM_run (argc, argv,
                         "gnunet-gns-proxy",
                         _ ("GNUnet GNS proxy"),
                         options,
                         &run, NULL)) ? 0 : 1;
  MHD_destroy_response (curl_failure_response);
  GNUNET_free_nz ((char *) argv);
  return ret;
}

References _, cafile_opt, curl_failure_response, disable_v6, gettext_noop, GNUNET_free_nz, GNUNET_GETOPT_OPTION_END, GNUNET_GETOPT_option_flag(), GNUNET_GETOPT_option_string(), GNUNET_GETOPT_option_uint16(), GNUNET_log_setup(), GNUNET_OK, GNUNET_PROGRAM_run(), GNUNET_STRINGS_get_utf8_args(), options, port, ret, and run().

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Variable Documentation

address

in_addr_t address

static

The address to bind to.

Definition at line 657 of file gnunet-gns-proxy.c.

Referenced by bind_v4(), and run().

address6

struct in6_addr address6

static

The IPv6 address to bind to.

Definition at line 662 of file gnunet-gns-proxy.c.

Referenced by bind_v6(), and run().

port

uint16_t port = 7777

static

The port the proxy is running on (default 7777)

Definition at line 667 of file gnunet-gns-proxy.c.

Referenced by bind_v4(), bind_v6(), create_response(), do_s5r_read(), main(), and run().

cafile_opt

char* cafile_opt

static

The CA file (pem) to use for the proxy CA.

Definition at line 672 of file gnunet-gns-proxy.c.

Referenced by main(), and run().

lsock4

struct GNUNET_NETWORK_Handle* lsock4

static

The listen socket of the proxy for IPv4.

Definition at line 677 of file gnunet-gns-proxy.c.

Referenced by do_accept(), do_shutdown(), and run().

lsock6

struct GNUNET_NETWORK_Handle* lsock6

static

The listen socket of the proxy for IPv6.

Definition at line 682 of file gnunet-gns-proxy.c.

Referenced by do_accept(), do_shutdown(), and run().

ltask4

struct GNUNET_SCHEDULER_Task* ltask4

static

The listen task ID for IPv4.

Definition at line 687 of file gnunet-gns-proxy.c.

Referenced by do_accept(), do_shutdown(), and run().

ltask6

struct GNUNET_SCHEDULER_Task* ltask6

static

The listen task ID for IPv6.

Definition at line 692 of file gnunet-gns-proxy.c.

Referenced by do_accept(), do_shutdown(), and run().

curl_download_task

struct GNUNET_SCHEDULER_Task* curl_download_task

static

The cURL download task (curl multi API).

Definition at line 697 of file gnunet-gns-proxy.c.

Referenced by curl_download_prepare(), curl_task_download(), and do_shutdown().

curl_multi

CURLM* curl_multi

static

The cURL multi handle.

Definition at line 702 of file gnunet-gns-proxy.c.

Referenced by cleanup_s5r(), create_response(), curl_download_prepare(), curl_task_download(), do_shutdown(), mhd_completed_cb(), and run().

gns_handle

struct GNUNET_GNS_Handle* gns_handle

static

Handle to the GNS service.

Definition at line 707 of file gnunet-gns-proxy.c.

Referenced by do_s5r_read(), do_shutdown(), and run().

disable_v6

int disable_v6

static

Disable IPv6.

Definition at line 712 of file gnunet-gns-proxy.c.

Referenced by handle_gns_result(), and main().

mhd_httpd_head

struct MhdHttpList* mhd_httpd_head

static

DLL for http/https daemons.

Definition at line 717 of file gnunet-gns-proxy.c.

Referenced by do_shutdown(), kill_httpd(), lookup_ssl_httpd(), and run().

mhd_httpd_tail

struct MhdHttpList* mhd_httpd_tail

static

DLL for http/https daemons.

Definition at line 722 of file gnunet-gns-proxy.c.

Referenced by kill_httpd(), lookup_ssl_httpd(), and run().

httpd

struct MhdHttpList* httpd

static

Daemon for HTTP (we have one per X.509 certificate, and then one for all HTTP connections; this is the one for HTTP, not HTTPS).

Definition at line 728 of file gnunet-gns-proxy.c.

Referenced by kill_httpd(), run(), schedule_httpd(), and setup_data_transfer().

s5r_head

struct Socks5Request* s5r_head

static

DLL of active socks requests.

Definition at line 733 of file gnunet-gns-proxy.c.

Referenced by cleanup_s5r(), do_accept(), do_shutdown(), and mhd_connection_cb().

s5r_tail

struct Socks5Request* s5r_tail

static

DLL of active socks requests.

Definition at line 738 of file gnunet-gns-proxy.c.

Referenced by cleanup_s5r(), and do_accept().

proxy_ca

struct ProxyCA proxy_ca

static

The CA for X.509 certificate generation.

Definition at line 743 of file gnunet-gns-proxy.c.

Referenced by do_shutdown(), generate_gns_certificate(), and run().

curl_failure_response

struct MHD_Response* curl_failure_response

static

Response we return on cURL failures.

Definition at line 748 of file gnunet-gns-proxy.c.

Referenced by cleanup_s5r(), create_response(), curl_task_download(), main(), and mhd_completed_cb().

cfg

const struct GNUNET_CONFIGURATION_Handle* cfg

static

Our configuration.

Definition at line 753 of file gnunet-gns-proxy.c.

Referenced by run().