GNUnet  0.10.x
Data Structures | Macros | Functions
plugin_transport_udp_broadcasting.c File Reference

Neighbour discovery with UDP. More...

#include "platform.h"
#include "plugin_transport_udp.h"
#include "gnunet_hello_lib.h"
#include "gnunet_util_lib.h"
#include "gnunet_fragmentation_lib.h"
#include "gnunet_protocols.h"
#include "gnunet_resolver_service.h"
#include "gnunet_signatures.h"
#include "gnunet_constants.h"
#include "gnunet_statistics_service.h"
#include "gnunet_transport_service.h"
#include "gnunet_transport_plugin.h"
#include "transport.h"
Include dependency graph for plugin_transport_udp_broadcasting.c:

Go to the source code of this file.

Data Structures

struct  UDP_Beacon_Message
 
struct  BroadcastAddress
 
struct  MstContext
 Client-specific context for broadcast_mst_cb(). More...
 

Macros

#define LOG(kind, ...)   GNUNET_log_from(kind, "transport-udp", __VA_ARGS__)
 

Functions

static int broadcast_mst_cb (void *cls, const struct GNUNET_MessageHeader *message)
 Parse broadcast message received. More...
 
void udp_broadcast_receive (struct Plugin *plugin, const char *buf, ssize_t size, const union UdpAddress *udp_addr, size_t udp_addr_len, enum GNUNET_NetworkType network_type)
 We received a broadcast message. More...
 
static unsigned int prepare_beacon (struct Plugin *plugin, struct UDP_Beacon_Message *msg)
 
static void udp_ipv4_broadcast_send (void *cls)
 
static void udp_ipv6_broadcast_send (void *cls)
 
static int iface_proc (void *cls, const char *name, int isDefault, const struct sockaddr *addr, const struct sockaddr *broadcast_addr, const struct sockaddr *netmask, socklen_t addrlen)
 Callback function invoked for each interface found. More...
 
void setup_broadcast (struct Plugin *plugin, struct sockaddr_in6 *server_addrv6, struct sockaddr_in *server_addrv4)
 Setup broadcasting subsystem. More...
 
void stop_broadcast (struct Plugin *plugin)
 Stop broadcasting subsystem. More...
 

Detailed Description

Neighbour discovery with UDP.

Author
Christian Grothoff
Matthias Wachs

Definition in file plugin_transport_udp_broadcasting.c.

Macro Definition Documentation

◆ LOG

#define LOG (   kind,
  ... 
)    GNUNET_log_from(kind, "transport-udp", __VA_ARGS__)

Function Documentation

◆ broadcast_mst_cb()

static int broadcast_mst_cb ( void *  cls,
const struct GNUNET_MessageHeader message 
)
static

Parse broadcast message received.

Parameters
clsthe struct Plugin
clientthe struct MstContext with sender address
messagethe message we received
Returns
GNUNET_OK (always)

Definition at line 132 of file plugin_transport_udp_broadcasting.c.

References _, address, GNUNET_DATACACHE_PluginEnvironment::cls, Plugin::env, GNUNET_ERROR_TYPE_DEBUG, GNUNET_HELLO_address_allocate(), GNUNET_HELLO_address_free, GNUNET_HELLO_ADDRESS_INFO_NONE, GNUNET_i2s(), GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON, GNUNET_NO, GNUNET_OK, GNUNET_STATISTICS_update(), UDP_Beacon_Message::header, LOG, mc, msg, MstContext::plugin, plugin, PLUGIN_NAME, UDP_Beacon_Message::sender, GNUNET_MessageHeader::size, GNUNET_MessageHeader::type, MstContext::udp_addr, MstContext::udp_addr_len, and udp_address_to_string().

Referenced by udp_broadcast_receive().

134 {
135  struct MstContext *mc = cls;
136  struct Plugin *plugin = mc->plugin;
138  const struct GNUNET_MessageHeader *hello;
139  const struct UDP_Beacon_Message *msg;
140 
141  msg = (const struct UDP_Beacon_Message *)message;
142 
144  ntohs(msg->header.type))
145  return GNUNET_OK;
147  "Received beacon with %u bytes from peer `%s' via address `%s'\n",
148  ntohs(msg->header.size),
149  GNUNET_i2s(&msg->sender),
151  mc->udp_addr,
152  mc->udp_addr_len));
153  hello = (struct GNUNET_MessageHeader *)&msg[1];
154  address = GNUNET_HELLO_address_allocate(&msg->sender,
155  PLUGIN_NAME,
156  mc->udp_addr,
157  mc->udp_addr_len,
159  plugin->env->receive(plugin->env->cls,
160  address,
161  NULL,
162  hello);
163  GNUNET_HELLO_address_free(address);
164  GNUNET_STATISTICS_update(plugin->env->stats,
165  _("# Multicast HELLO beacons received via UDP"),
166  1, GNUNET_NO);
167  return GNUNET_OK;
168 }
struct GNUNET_MessageHeader * msg
Definition: 005.c:2
struct GNUNET_HELLO_Address * GNUNET_HELLO_address_allocate(const struct GNUNET_PeerIdentity *peer, const char *transport_name, const void *address, size_t address_length, enum GNUNET_HELLO_AddressInfo local_info)
Allocate an address struct.
Definition: address.c:73
#define GNUNET_NO
Definition: gnunet_common.h:78
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
struct GNUNET_PeerIdentity sender
What is the identity of the sender.
Client-specific context for broadcast_mst_cb().
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
#define _(String)
GNU gettext support macro.
Definition: platform.h:181
static struct GNUNET_ATS_SolverFunctions * plugin
Our solver.
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
#define LOG(kind,...)
struct GNUNET_DATACACHE_PluginEnvironment * env
Our execution environment.
static struct GNUNET_TESTBED_Controller * mc
Handle to the master controller.
struct GNUNET_MessageHeader header
Message header.
No additional information.
Handle for a plugin.
Definition: block.c:37
#define PLUGIN_NAME
An address for communicating with a peer.
const char * udp_address_to_string(void *cls, const void *addr, size_t addrlen)
Function called for a quick conversion of the binary address to a numeric address.
void * cls
Closure to use for callbacks.
Header for all communications.
#define GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON
Message send by a peer to notify the other to keep the session alive.
static char * address
GNS address for this phone.
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
#define GNUNET_HELLO_address_free(addr)
Free an address.
const union UdpAddress * udp_addr
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◆ udp_broadcast_receive()

void udp_broadcast_receive ( struct Plugin plugin,
const char *  buf,
ssize_t  size,
const union UdpAddress udp_addr,
size_t  udp_addr_len,
enum GNUNET_NetworkType  network_type 
)

We received a broadcast message.

Process it and all subsequent messages in the same packet.

Parameters
pluginthe UDP plugin
bufthe buffer with the message(s)
sizenumber of bytes in buf
udp_addraddress of the sender
udp_addr_lennumber of bytes in udp_addr
network_typenetwork type of the sender's address

Definition at line 183 of file plugin_transport_udp_broadcasting.c.

References MstContext::ats_address_network_type, broadcast_mst_cb(), GNUNET_MST_create(), GNUNET_MST_destroy(), GNUNET_MST_from_buffer(), GNUNET_NO, MstContext::plugin, plugin, MstContext::udp_addr, and MstContext::udp_addr_len.

Referenced by udp_select_read().

189 {
190  struct GNUNET_MessageStreamTokenizer *broadcast_mst;
191  struct MstContext mc;
192 
193  broadcast_mst = GNUNET_MST_create(&broadcast_mst_cb,
194  &mc);
195  mc.plugin = plugin;
196  mc.udp_addr = udp_addr;
197  mc.udp_addr_len = udp_addr_len;
198  mc.ats_address_network_type = network_type;
199  GNUNET_MST_from_buffer(broadcast_mst,
200  buf, size,
201  GNUNET_NO,
202  GNUNET_NO);
203  GNUNET_MST_destroy(broadcast_mst);
204 }
#define GNUNET_NO
Definition: gnunet_common.h:78
Client-specific context for broadcast_mst_cb().
static struct GNUNET_ATS_SolverFunctions * plugin
Our solver.
void GNUNET_MST_destroy(struct GNUNET_MessageStreamTokenizer *mst)
Destroys a tokenizer.
Definition: mst.c:410
Handle to a message stream tokenizer.
Definition: mst.c:43
static char buf[2048]
struct GNUNET_MessageStreamTokenizer * GNUNET_MST_create(GNUNET_MessageTokenizerCallback cb, void *cb_cls)
Create a message stream tokenizer.
Definition: mst.c:84
static int broadcast_mst_cb(void *cls, const struct GNUNET_MessageHeader *message)
Parse broadcast message received.
int GNUNET_MST_from_buffer(struct GNUNET_MessageStreamTokenizer *mst, const char *buf, size_t size, int purge, int one_shot)
Add incoming data to the receive buffer and call the callback for all complete messages.
Definition: mst.c:113
static struct GNUNET_TESTBED_Controller * mc
Handle to the master controller.
static unsigned int size
Size of the "table".
Definition: peer.c:66
const union UdpAddress * udp_addr
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◆ prepare_beacon()

static unsigned int prepare_beacon ( struct Plugin plugin,
struct UDP_Beacon_Message msg 
)
static

Definition at line 208 of file plugin_transport_udp_broadcasting.c.

References Plugin::env, GNUNET_HELLO_size(), GNUNET_memcpy, GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON, UDP_Beacon_Message::header, UDP_Beacon_Message::sender, GNUNET_MessageHeader::size, GNUNET_MessageHeader::type, and UDP_MTU.

Referenced by udp_ipv4_broadcast_send(), and udp_ipv6_broadcast_send().

210 {
211  uint16_t hello_size;
212  uint16_t msg_size;
213 
214  const struct GNUNET_MessageHeader *hello;
215 
216  hello = plugin->env->get_our_hello();
217  if (NULL == hello)
218  return 0;
219  hello_size = GNUNET_HELLO_size((struct GNUNET_HELLO_Message *)hello);
220  msg_size = hello_size + sizeof(struct UDP_Beacon_Message);
221 
222  if (hello_size < (sizeof(struct GNUNET_MessageHeader)) ||
223  (msg_size > (UDP_MTU)))
224  return 0;
225 
226  msg->sender = *(plugin->env->my_identity);
227  msg->header.size = htons(msg_size);
229  GNUNET_memcpy(&msg[1], hello, hello_size);
230  return msg_size;
231 }
A HELLO message is used to exchange information about transports with other peers.
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
struct GNUNET_PeerIdentity sender
What is the identity of the sender.
#define UDP_MTU
MTU for fragmentation subsystem.
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
struct GNUNET_DATACACHE_PluginEnvironment * env
Our execution environment.
struct GNUNET_MessageHeader header
Message header.
uint16_t GNUNET_HELLO_size(const struct GNUNET_HELLO_Message *hello)
Return the size of the given HELLO message.
Definition: hello.c:643
Header for all communications.
#define GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON
Message send by a peer to notify the other to keep the session alive.
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◆ udp_ipv4_broadcast_send()

static void udp_ipv4_broadcast_send ( void *  cls)
static

Definition at line 235 of file plugin_transport_udp_broadcasting.c.

References BroadcastAddress::addr, BroadcastAddress::addrlen, Plugin::broadcast_interval, BroadcastAddress::broadcast_task, buf, GNUNET_a2s(), GNUNET_ALIGN, GNUNET_ERROR_TYPE_BULK, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_log_strerror, GNUNET_NETWORK_socket_sendto(), GNUNET_SCHEDULER_add_delayed(), GNUNET_SCHEDULER_add_write_file(), GNUNET_SYSERR, GNUNET_TIME_UNIT_FOREVER_REL, LOG, BroadcastAddress::plugin, plugin, Plugin::port, prepare_beacon(), GNUNET_TIME_Relative::rel_value_us, and Plugin::sockv4.

Referenced by iface_proc().

236 {
237  struct BroadcastAddress *baddr = cls;
238  struct Plugin *plugin = baddr->plugin;
239  int sent;
240  uint16_t msg_size;
241  char buf[65536] GNUNET_ALIGN;
242 
243  baddr->broadcast_task = NULL;
244 
245  msg_size = prepare_beacon(plugin, (struct UDP_Beacon_Message *)&buf);
246  if (0 != msg_size)
247  {
248  struct sockaddr_in *addr = (struct sockaddr_in *)baddr->addr;
249 
250  addr->sin_port = htons(plugin->port);
251  sent = GNUNET_NETWORK_socket_sendto(plugin->sockv4, &buf, msg_size,
252  (const struct sockaddr *)addr,
253  baddr->addrlen);
254  if (sent == GNUNET_SYSERR)
255  {
256  if ((ENETUNREACH == errno) || (ENETDOWN == errno))
257  {
258  /* "Network unreachable" or "Network down"
259  *
260  * This indicates that we just do not have network connectivity
261  */
263  "Network connectivity is down, cannot send beacon!\n");
264  }
265  else
267  }
268  else
269  {
271  "Sent HELLO beacon broadcast with %i bytes to address %s\n", sent,
272  GNUNET_a2s(baddr->addr, baddr->addrlen));
273  }
274  }
275 
276 #if LINUX
277  /*
278  * Cryogenic
279  */
280  if (NULL != baddr->cryogenic_fd)
281  {
282  baddr->cryogenic_times.delay_msecs = (plugin->broadcast_interval.rel_value_us / 1000.0) * 0.5;
283  baddr->cryogenic_times.timeout_msecs = (plugin->broadcast_interval.rel_value_us / 1000.0) * 1.5;
284 
285  if (ioctl(baddr->cryogenic_fd->fd,
286  PM_SET_DELAY_AND_TIMEOUT,
287  &baddr->cryogenic_times) < 0)
288  {
290  baddr->broadcast_task =
292  &udp_ipv4_broadcast_send, baddr);
293  }
294  else
296  baddr->cryogenic_fd,
298  baddr);
299  }
300  else
301 #endif
302  baddr->broadcast_task =
304  &udp_ipv4_broadcast_send, baddr);
305 }
uint64_t rel_value_us
The actual value.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_write_file(struct GNUNET_TIME_Relative delay, const struct GNUNET_DISK_FileHandle *wfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay or when the specified file descriptor is ready f...
Definition: scheduler.c:1647
struct GNUNET_NETWORK_Handle * sockv4
The read socket for IPv4.
static struct GNUNET_ATS_SolverFunctions * plugin
Our solver.
#define GNUNET_log_strerror(level, cmd)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed(struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1237
#define LOG(kind,...)
ssize_t GNUNET_NETWORK_socket_sendto(const struct GNUNET_NETWORK_Handle *desc, const void *message, size_t length, const struct sockaddr *dest_addr, socklen_t dest_len)
Send data to a particular destination (always non-blocking).
Definition: network.c:838
static char buf[2048]
static unsigned int prepare_beacon(struct Plugin *plugin, struct UDP_Beacon_Message *msg)
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
const char * GNUNET_a2s(const struct sockaddr *addr, socklen_t addrlen)
Convert a "struct sockaddr*" (IPv4 or IPv6 address) to a string (for printing debug messages)...
static void udp_ipv4_broadcast_send(void *cls)
struct GNUNET_SCHEDULER_Task * broadcast_task
ID of select broadcast task.
struct GNUNET_TIME_Relative broadcast_interval
Broadcast interval.
#define GNUNET_SYSERR
Definition: gnunet_common.h:76
#define GNUNET_ALIGN
gcc-ism to force alignment; we use this to align char-arrays that may then be cast to &#39;struct&#39;s...
Handle for a plugin.
Definition: block.c:37
#define GNUNET_log(kind,...)
uint16_t port
Port used.
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◆ udp_ipv6_broadcast_send()

static void udp_ipv6_broadcast_send ( void *  cls)
static

Definition at line 309 of file plugin_transport_udp_broadcasting.c.

References BroadcastAddress::addr, Plugin::broadcast_interval, BroadcastAddress::broadcast_task, buf, GNUNET_a2s(), GNUNET_ALIGN, GNUNET_ERROR_TYPE_BULK, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_log_strerror, GNUNET_NETWORK_socket_sendto(), GNUNET_SCHEDULER_add_delayed(), GNUNET_SCHEDULER_add_write_file(), GNUNET_SYSERR, GNUNET_TIME_UNIT_FOREVER_REL, Plugin::ipv6_multicast_address, LOG, BroadcastAddress::plugin, plugin, prepare_beacon(), GNUNET_TIME_Relative::rel_value_us, and Plugin::sockv6.

Referenced by iface_proc().

310 {
311  struct BroadcastAddress *baddr = cls;
312  struct Plugin *plugin = baddr->plugin;
313  ssize_t sent;
314  uint16_t msg_size;
315  char buf[65536] GNUNET_ALIGN;
316  const struct sockaddr_in6 *s6 = (const struct sockaddr_in6 *)baddr->addr;
317 
318  baddr->broadcast_task = NULL;
319 
320  msg_size = prepare_beacon(plugin, (struct UDP_Beacon_Message *)&buf);
321  /* Note: unclear if this actually works to limit the multicast to
322  the specified interface as we're not (necessarily) using a
323  link-local multicast group and the kernel suggests that the
324  scope ID is only respected for link-local addresses; however,
325  if the scope ID is ignored, the kernel should just multicast
326  on ALL interfaces, which is merely slightly less efficient;
327  in that case, we might want to revert to only doing this
328  once, and not per interface (hard to test...) */
329  plugin->ipv6_multicast_address.sin6_scope_id = s6->sin6_scope_id;
330  sent = GNUNET_NETWORK_socket_sendto(plugin->sockv6, &buf, msg_size,
331  (const struct sockaddr *)
332  &plugin->ipv6_multicast_address,
333  sizeof(struct sockaddr_in6));
334  plugin->ipv6_multicast_address.sin6_scope_id = 0;
335  if (sent == GNUNET_SYSERR)
336  {
337  if ((ENETUNREACH == errno) || (ENETDOWN == errno))
338  {
339  /* "Network unreachable" or "Network down"
340  *
341  * This indicates that this system is IPv6 enabled, but does not
342  * have a valid global IPv6 address assigned
343  */
345  "Network connectivity is down, cannot send beacon!\n");
346  }
347  else
349  }
350  else
351  {
353  "Sending IPv6 HELLO beacon broadcast with %d bytes to address %s\n",
354  (int)sent,
355  GNUNET_a2s((const struct sockaddr *)&plugin->ipv6_multicast_address,
356  sizeof(struct sockaddr_in6)));
357  }
358 #if LINUX
359  /*
360  * Cryogenic
361  */
362  if (NULL != baddr->cryogenic_fd)
363  {
364  baddr->cryogenic_times.delay_msecs = (plugin->broadcast_interval.rel_value_us / 1000.0) * 0.5;
365  baddr->cryogenic_times.timeout_msecs = (plugin->broadcast_interval.rel_value_us / 1000.0) * 1.5;
366 
367  if (ioctl(baddr->cryogenic_fd->fd,
368  PM_SET_DELAY_AND_TIMEOUT,
369  &baddr->cryogenic_times) < 0)
370  {
372  baddr->broadcast_task =
374  &udp_ipv6_broadcast_send, baddr);
375  }
376  else
378  baddr->cryogenic_fd,
380  baddr);
381  }
382  else
383 #endif
384  baddr->broadcast_task =
386  &udp_ipv6_broadcast_send, baddr);
387 }
uint64_t rel_value_us
The actual value.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_write_file(struct GNUNET_TIME_Relative delay, const struct GNUNET_DISK_FileHandle *wfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay or when the specified file descriptor is ready f...
Definition: scheduler.c:1647
static struct GNUNET_ATS_SolverFunctions * plugin
Our solver.
#define GNUNET_log_strerror(level, cmd)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed(struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1237
#define LOG(kind,...)
ssize_t GNUNET_NETWORK_socket_sendto(const struct GNUNET_NETWORK_Handle *desc, const void *message, size_t length, const struct sockaddr *dest_addr, socklen_t dest_len)
Send data to a particular destination (always non-blocking).
Definition: network.c:838
static char buf[2048]
static unsigned int prepare_beacon(struct Plugin *plugin, struct UDP_Beacon_Message *msg)
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
const char * GNUNET_a2s(const struct sockaddr *addr, socklen_t addrlen)
Convert a "struct sockaddr*" (IPv4 or IPv6 address) to a string (for printing debug messages)...
struct GNUNET_SCHEDULER_Task * broadcast_task
ID of select broadcast task.
struct GNUNET_TIME_Relative broadcast_interval
Broadcast interval.
#define GNUNET_SYSERR
Definition: gnunet_common.h:76
#define GNUNET_ALIGN
gcc-ism to force alignment; we use this to align char-arrays that may then be cast to &#39;struct&#39;s...
Handle for a plugin.
Definition: block.c:37
#define GNUNET_log(kind,...)
struct GNUNET_NETWORK_Handle * sockv6
The read socket for IPv6.
static void udp_ipv6_broadcast_send(void *cls)
struct sockaddr_in6 ipv6_multicast_address
IPv6 multicast address.
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◆ iface_proc()

static int iface_proc ( void *  cls,
const char *  name,
int  isDefault,
const struct sockaddr *  addr,
const struct sockaddr *  broadcast_addr,
const struct sockaddr *  netmask,
socklen_t  addrlen 
)
static

Callback function invoked for each interface found.

Parameters
clsclosure with the struct Plugin
namename of the interface (can be NULL for unknown)
isDefaultis this presumably the default interface
addraddress of this interface (can be NULL for unknown or unassigned)
broadcast_addrthe broadcast address (can be NULL for unknown or unassigned)
netmaskthe network mask (can be NULL for unknown or unassigned)
addrlenlength of the address
Returns
GNUNET_OK to continue iteration, GNUNET_SYSERR to abort

Definition at line 403 of file plugin_transport_udp_broadcasting.c.

References BroadcastAddress::addr, BroadcastAddress::addrlen, Plugin::broadcast_head, Plugin::broadcast_tail, BroadcastAddress::broadcast_task, GNUNET_DATACACHE_PluginEnvironment::cls, Plugin::enable_ipv4, Plugin::enable_ipv6, Plugin::env, filename, GNUNET_a2s(), GNUNET_asprintf(), GNUNET_CONTAINER_DLL_insert, GNUNET_DISK_file_open(), GNUNET_DISK_OPEN_WRITE, GNUNET_DISK_PERM_NONE, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_memcpy, GNUNET_NETWORK_socket_setsockopt(), GNUNET_new, GNUNET_NT_LOOPBACK, GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_YES, Plugin::ipv6_multicast_address, LOG, BroadcastAddress::plugin, plugin, Plugin::sockv4, Plugin::sockv6, udp_ipv4_broadcast_send(), and udp_ipv6_broadcast_send().

Referenced by setup_broadcast().

409 {
410  struct Plugin *plugin = cls;
411  struct BroadcastAddress *ba;
412  enum GNUNET_NetworkType network;
413 
414  if (NULL == addr)
415  return GNUNET_OK;
417  "address %s for interface %s %p\n ",
419  if (NULL == broadcast_addr)
420  return GNUNET_OK;
422  "broadcast address %s for interface %s %p\n ",
423  GNUNET_a2s(broadcast_addr, addrlen), name, broadcast_addr);
424  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "netmask %s for interface %s %p\n ",
425  GNUNET_a2s(netmask, addrlen), name, netmask);
426 
427  network = plugin->env->get_address_type(plugin->env->cls, broadcast_addr, addrlen);
428  if (GNUNET_NT_LOOPBACK == network)
429  {
430  /* Broadcasting on loopback does not make sense */
431  return GNUNET_YES;
432  }
433 
434  ba = GNUNET_new(struct BroadcastAddress);
435  ba->plugin = plugin;
436  ba->addr = GNUNET_malloc(addrlen);
437  GNUNET_memcpy(ba->addr, broadcast_addr, addrlen);
438  ba->addrlen = addrlen;
439 
440  if ((GNUNET_YES == plugin->enable_ipv4) &&
441  (NULL != plugin->sockv4) &&
442  (addrlen == sizeof(struct sockaddr_in)))
443  {
444 #if LINUX
445  /*
446  * setup Cryogenic FD for ipv4 broadcasting
447  */
448  char *filename;
449 
450  GNUNET_asprintf(&filename,
451  "/dev/cryogenic/%s",
452  name);
453  if (0 == access(name, R_OK))
454  {
455  ba->cryogenic_fd =
456  GNUNET_DISK_file_open(filename,
459  }
460  GNUNET_free(filename);
461 #endif
462  ba->broadcast_task =
464  }
465  if ((GNUNET_YES == plugin->enable_ipv6) &&
466  (NULL != plugin->sockv6) &&
467  (addrlen == sizeof(struct sockaddr_in6)))
468  {
469  /* Create IPv6 multicast request */
470  struct ipv6_mreq multicastRequest;
471  const struct sockaddr_in6 *s6 = (const struct sockaddr_in6 *)broadcast_addr;
472 
473  multicastRequest.ipv6mr_multiaddr =
474  plugin->ipv6_multicast_address.sin6_addr;
475  /* http://tools.ietf.org/html/rfc2553#section-5.2:
476  *
477  * IPV6_JOIN_GROUP
478  *
479  * Join a multicast group on a specified local interface. If the
480  * interface index is specified as 0, the kernel chooses the local
481  * interface. For example, some kernels look up the multicast
482  * group in the normal IPv6 routing table and using the resulting
483  * interface; we do this for each interface, so no need to use
484  * zero (anymore...).
485  */
486  multicastRequest.ipv6mr_interface = s6->sin6_scope_id;
487 
488  /* Join the multicast group */
489  if (GNUNET_OK !=
491  (plugin->sockv6, IPPROTO_IPV6, IPV6_JOIN_GROUP,
492  &multicastRequest, sizeof(multicastRequest)))
493  {
495  "Failed to join IPv6 multicast group: IPv6 broadcasting not running\n");
496  }
497  else
498  {
499 #if LINUX
500  /*
501  * setup Cryogenic FD for ipv6 broadcasting
502  */
503  char *filename;
504 
505  GNUNET_asprintf(&filename,
506  "/dev/cryogenic/%s",
507  name);
508  if (0 == access(name, R_OK))
509  {
510  ba->cryogenic_fd =
511  GNUNET_DISK_file_open(filename,
514  }
515  GNUNET_free(filename);
516 #endif
517  ba->broadcast_task =
519  }
520  }
522  plugin->broadcast_tail, ba);
523  return GNUNET_OK;
524 }
int GNUNET_NETWORK_socket_setsockopt(struct GNUNET_NETWORK_Handle *fd, int level, int option_name, const void *option_value, socklen_t option_len)
Set socket option.
Definition: network.c:871
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
int enable_ipv4
Is IPv4 enabled: GNUNET_YES or GNUNET_NO.
Nobody is allowed to do anything to the file.
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
#define GNUNET_new(type)
Allocate a struct or union of the given type.
struct GNUNET_NETWORK_Handle * sockv4
The read socket for IPv4.
GNUNET_NetworkType
Types of networks (with separate quotas) we support.
Definition: gnunet_nt_lib.h:35
static struct GNUNET_ATS_SolverFunctions * plugin
Our solver.
int GNUNET_asprintf(char **buf, const char *format,...)
Like asprintf, just portable.
#define LOG(kind,...)
struct GNUNET_DATACACHE_PluginEnvironment * env
Our execution environment.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1264
static char * filename
const char * GNUNET_a2s(const struct sockaddr *addr, socklen_t addrlen)
Convert a "struct sockaddr*" (IPv4 or IPv6 address) to a string (for printing debug messages)...
static void udp_ipv4_broadcast_send(void *cls)
struct GNUNET_SCHEDULER_Task * broadcast_task
ID of select broadcast task.
struct BroadcastAddress * broadcast_head
Tail of DLL of broadcast addresses.
Open the file for writing.
const char * name
Loopback (same host).
Definition: gnunet_nt_lib.h:44
Handle for a plugin.
Definition: block.c:37
#define GNUNET_log(kind,...)
struct GNUNET_NETWORK_Handle * sockv6
The read socket for IPv6.
void * cls
Closure to use for callbacks.
#define GNUNET_YES
Definition: gnunet_common.h:77
static void udp_ipv6_broadcast_send(void *cls)
struct BroadcastAddress * broadcast_tail
Head of DLL of broadcast addresses.
struct GNUNET_DISK_FileHandle * GNUNET_DISK_file_open(const char *fn, enum GNUNET_DISK_OpenFlags flags, enum GNUNET_DISK_AccessPermissions perm)
Open a file.
Definition: disk.c:1262
struct sockaddr_in6 ipv6_multicast_address
IPv6 multicast address.
#define GNUNET_malloc(size)
Wrapper around malloc.
int enable_ipv6
Is IPv6 enabled: GNUNET_YES or GNUNET_NO.
#define GNUNET_free(ptr)
Wrapper around free.
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◆ setup_broadcast()

void setup_broadcast ( struct Plugin plugin,
struct sockaddr_in6 *  server_addrv6,
struct sockaddr_in *  server_addrv4 
)

Setup broadcasting subsystem.

Parameters
plugin
server_addrv6
server_addrv4

Definition at line 535 of file plugin_transport_udp_broadcasting.c.

References _, GNUNET_DATACACHE_PluginEnvironment::cfg, Plugin::enable_broadcasting, Plugin::enable_ipv4, Plugin::enable_ipv6, Plugin::env, GNUNET_assert, GNUNET_CONFIGURATION_get_value_yesno(), GNUNET_ERROR_TYPE_WARNING, GNUNET_NETWORK_socket_setsockopt(), GNUNET_OK, GNUNET_OS_network_interfaces_list(), GNUNET_YES, iface_proc(), Plugin::ipv6_multicast_address, LOG, Plugin::port, Plugin::sockv4, and Plugin::sockv6.

Referenced by libgnunet_plugin_transport_udp_init().

538 {
539  if (GNUNET_YES ==
541  "topology",
542  "FRIENDS-ONLY"))
543  {
545  _("Disabling HELLO broadcasting due to friend-to-friend only configuration!\n"));
546  return;
547  }
548 
549  if (GNUNET_YES != plugin->enable_broadcasting)
550  return; /* We do not send, just receive */
551 
552  /* create IPv4 broadcast socket */
553  if ((GNUNET_YES == plugin->enable_ipv4) && (NULL != plugin->sockv4))
554  {
555  static int yes = 1;
556 
558  (plugin->sockv4, SOL_SOCKET, SO_BROADCAST, &yes,
559  sizeof(int)) != GNUNET_OK)
560  {
562  _("Failed to set IPv4 broadcast option for broadcast socket on port %d\n"),
563  ntohs(server_addrv4->sin_port));
564  }
565  }
566  /* create IPv6 multicast socket */
567  if ((GNUNET_YES == plugin->enable_ipv6) && (plugin->sockv6 != NULL))
568  {
569  memset(&plugin->ipv6_multicast_address, 0, sizeof(struct sockaddr_in6));
570  GNUNET_assert(1 ==
571  inet_pton(AF_INET6, "FF05::13B",
572  &plugin->ipv6_multicast_address.sin6_addr));
573  plugin->ipv6_multicast_address.sin6_family = AF_INET6;
574  plugin->ipv6_multicast_address.sin6_port = htons(plugin->port);
575  }
577 }
int GNUNET_NETWORK_socket_setsockopt(struct GNUNET_NETWORK_Handle *fd, int level, int option_name, const void *option_value, socklen_t option_len)
Set socket option.
Definition: network.c:871
int enable_broadcasting
Is broadcasting enabled: GNUNET_YES or GNUNET_NO.
const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration to use.
int enable_ipv4
Is IPv4 enabled: GNUNET_YES or GNUNET_NO.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
void GNUNET_OS_network_interfaces_list(GNUNET_OS_NetworkInterfaceProcessor proc, void *proc_cls)
Enumerate all network interfaces.
Definition: os_network.c:388
struct GNUNET_NETWORK_Handle * sockv4
The read socket for IPv4.
#define _(String)
GNU gettext support macro.
Definition: platform.h:181
#define LOG(kind,...)
struct GNUNET_DATACACHE_PluginEnvironment * env
Our execution environment.
struct GNUNET_NETWORK_Handle * sockv6
The read socket for IPv6.
uint16_t port
Port used.
static int iface_proc(void *cls, const char *name, int isDefault, const struct sockaddr *addr, const struct sockaddr *broadcast_addr, const struct sockaddr *netmask, socklen_t addrlen)
Callback function invoked for each interface found.
#define GNUNET_YES
Definition: gnunet_common.h:77
int GNUNET_CONFIGURATION_get_value_yesno(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option)
Get a configuration value that should be in a set of "YES" or "NO".
struct sockaddr_in6 ipv6_multicast_address
IPv6 multicast address.
int enable_ipv6
Is IPv6 enabled: GNUNET_YES or GNUNET_NO.
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◆ stop_broadcast()

void stop_broadcast ( struct Plugin plugin)

Stop broadcasting subsystem.

Parameters
plugin

Definition at line 586 of file plugin_transport_udp_broadcasting.c.

References BroadcastAddress::addr, BroadcastAddress::addrlen, Plugin::broadcast_head, Plugin::broadcast_tail, BroadcastAddress::broadcast_task, Plugin::enable_broadcasting, Plugin::enable_ipv6, GNUNET_CONTAINER_DLL_remove, GNUNET_DISK_file_close(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log_strerror, GNUNET_NETWORK_socket_setsockopt(), GNUNET_OK, GNUNET_SCHEDULER_cancel(), GNUNET_YES, Plugin::ipv6_multicast_address, LOG, p, and Plugin::sockv6.

Referenced by libgnunet_plugin_transport_udp_done().

587 {
588  if (GNUNET_YES == plugin->enable_broadcasting)
589  {
590  /* Disable broadcasting */
591  while (plugin->broadcast_head != NULL)
592  {
593  struct BroadcastAddress *p = plugin->broadcast_head;
594 
595  if (p->broadcast_task != NULL)
596  {
598  p->broadcast_task = NULL;
599  }
600  if ((GNUNET_YES == plugin->enable_ipv6) &&
601  (NULL != plugin->sockv6) &&
602  (p->addrlen == sizeof(struct sockaddr_in6)))
603  {
604  /* Create IPv6 multicast request */
605  struct ipv6_mreq multicastRequest;
606  const struct sockaddr_in6 *s6 = (const struct sockaddr_in6 *)p->addr;
607 
608  multicastRequest.ipv6mr_multiaddr =
609  plugin->ipv6_multicast_address.sin6_addr;
610  multicastRequest.ipv6mr_interface = s6->sin6_scope_id;
611 
612  /* Leave the multicast group */
613  if (GNUNET_OK ==
615  (plugin->sockv6, IPPROTO_IPV6, IPV6_LEAVE_GROUP,
616  &multicastRequest, sizeof(multicastRequest)))
617  {
619  }
620  else
621  {
622  LOG(GNUNET_ERROR_TYPE_DEBUG, "IPv6 multicasting stopped\n");
623  }
624  }
625 
626 #if LINUX
627  GNUNET_DISK_file_close(p->cryogenic_fd);
628 #endif
630  plugin->broadcast_tail, p);
631  GNUNET_free(p->addr);
632  GNUNET_free(p);
633  }
634  }
635 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
int GNUNET_NETWORK_socket_setsockopt(struct GNUNET_NETWORK_Handle *fd, int level, int option_name, const void *option_value, socklen_t option_len)
Set socket option.
Definition: network.c:871
int enable_broadcasting
Is broadcasting enabled: GNUNET_YES or GNUNET_NO.
int GNUNET_DISK_file_close(struct GNUNET_DISK_FileHandle *h)
Close an open file.
Definition: disk.c:1339
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
#define GNUNET_log_strerror(level, cmd)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
#define LOG(kind,...)
static struct GNUNET_OS_Process * p
Helper process we started.
Definition: gnunet-qr.c:59
struct GNUNET_SCHEDULER_Task * broadcast_task
ID of select broadcast task.
struct BroadcastAddress * broadcast_head
Tail of DLL of broadcast addresses.
struct GNUNET_NETWORK_Handle * sockv6
The read socket for IPv6.
#define GNUNET_YES
Definition: gnunet_common.h:77
struct BroadcastAddress * broadcast_tail
Head of DLL of broadcast addresses.
struct sockaddr_in6 ipv6_multicast_address
IPv6 multicast address.
int enable_ipv6
Is IPv6 enabled: GNUNET_YES or GNUNET_NO.
#define GNUNET_free(ptr)
Wrapper around free.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:956
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