helper library for handling URI-based HELLOs More...

#include "platform.h"
#include "gnunet_signatures.h"
#include "gnunet_hello_uri_lib.h"
#include "gnunet_protocols.h"
#include "gnunet_util_lib.h"

Include dependency graph for hello-uri.c:

Data Structures
struct	HelloSignaturePurpose
	Message signed as part of a HELLO block/URL. More...

struct	HelloUriMessage
	Message used when gossiping HELLOs between peers. More...

struct	BlockHeader
	Start of a 'block'. More...

struct	DhtHelloMessage
	Message used when a DHT provides its HELLO to direct neighbours. More...

struct	Address
	Address of a peer. More...

struct	GNUNET_HELLO_Builder
	Context for building (or parsing) HELLO URIs. More...

Functions
static void	hash_addresses (const struct GNUNET_HELLO_Builder builder, struct GNUNET_HashCode hash)
	Compute hash over addresses in builder. More...

static void	sign_hello (const struct GNUNET_HELLO_Builder builder, struct GNUNET_TIME_Timestamp et, const struct GNUNET_CRYPTO_EddsaPrivateKey priv, struct GNUNET_CRYPTO_EddsaSignature *sig)
	Create HELLO signature. More...

static enum GNUNET_GenericReturnValue	verify_hello (const struct GNUNET_HELLO_Builder builder, struct GNUNET_TIME_Absolute et, const struct GNUNET_CRYPTO_EddsaSignature sig)
	Verify HELLO signature. More...

struct GNUNET_HELLO_Builder *	GNUNET_HELLO_builder_new (const struct GNUNET_PeerIdentity *pid)
	Allocate builder. More...

void	GNUNET_HELLO_builder_free (struct GNUNET_HELLO_Builder *builder)
	Release resources of a builder. More...

struct GNUNET_HELLO_Builder *	GNUNET_HELLO_builder_from_msg (const struct GNUNET_MessageHeader *msg)
	Parse msg into builder. More...

struct GNUNET_HELLO_Builder *	GNUNET_HELLO_builder_from_block (const void *block, size_t block_size)
	Parse block into builder. More...

struct GNUNET_HELLO_Builder *	GNUNET_HELLO_builder_from_url (const char *url)
	Parse GNUnet HELLO url into builder. More...

struct GNUNET_MQ_Envelope *	GNUNET_HELLO_builder_to_env (const struct GNUNET_HELLO_Builder builder, const struct GNUNET_CRYPTO_EddsaPrivateKey priv)
	Generate envelope with GNUnet HELLO message (including peer ID) from a builder. More...

struct GNUNET_MessageHeader *	GNUNET_HELLO_builder_to_dht_hello_msg (const struct GNUNET_HELLO_Builder builder, const struct GNUNET_CRYPTO_EddsaPrivateKey priv)
	Generate DHT HELLO message (without peer ID) from a builder. More...

char *	GNUNET_HELLO_builder_to_url (const struct GNUNET_HELLO_Builder builder, const struct GNUNET_CRYPTO_EddsaPrivateKey priv)
	Generate GNUnet HELLO URI from a builder. More...

enum GNUNET_GenericReturnValue	GNUNET_HELLO_builder_to_block (const struct GNUNET_HELLO_Builder builder, const struct GNUNET_CRYPTO_EddsaPrivateKey priv, void block, size_t block_size)
	Generate DHT block from a builder. More...

enum GNUNET_GenericReturnValue	GNUNET_HELLO_builder_add_address (struct GNUNET_HELLO_Builder builder, const char address)
	Add individual address to the builder. More...

enum GNUNET_GenericReturnValue	GNUNET_HELLO_builder_del_address (struct GNUNET_HELLO_Builder builder, const char address)
	Remove individual address from the builder. More...

void	GNUNET_HELLO_builder_iterate (const struct GNUNET_HELLO_Builder builder, struct GNUNET_PeerIdentity pid, GNUNET_HELLO_UriCallback uc, void *uc_cls)
	Iterate over URIs in a builder. More...

enum GNUNET_GenericReturnValue	GNUNET_HELLO_dht_msg_to_block (const struct GNUNET_MessageHeader hello, const struct GNUNET_PeerIdentity pid, void *block, size_t block_size, struct GNUNET_TIME_Absolute *block_expiration)
	Convert a DHT hello message to a HELLO block. More...

Detailed Description

helper library for handling URI-based HELLOs

Author: Christian Grothoff

Note:

Current API does not support deserializing HELLO of another peer and then serializing it into another format (we always require the private key). Not sure if we need this, but if we do, we need to extend the builder and the API.
Current API does not allow overriding the default HELLO expiration time. We may want to add a function that does this to create bootstrap HELLOs shipped with the TGZ.

Definition in file hello-uri.c.

Function Documentation

◆ hash_addresses()

static void hash_addresses	(	const struct GNUNET_HELLO_Builder *	builder,
		struct GNUNET_HashCode *	hash
	)

static

Compute hash over addresses in builder.

Parameters

	builder	the builder to hash addresses of
[out]	hash	where to write the hash

Definition at line 215 of file hello-uri.c.

 {
   struct GNUNET_HashContext *hc;
  
   hc = GNUNET_CRYPTO_hash_context_start ();
   for (struct Address *a = builder->a_head;
        NULL != a;
        a = a->next)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Hashing over %.*s\n",
                 (int) a->uri_len,
                 a->uri);
     GNUNET_CRYPTO_hash_context_read (hc,
                                      a->uri,
                                      a->uri_len);
   }
   GNUNET_CRYPTO_hash_context_finish (hc,
                                      hash);
  
 }

References builder, GNUNET_CRYPTO_hash_context_finish(), GNUNET_CRYPTO_hash_context_read(), GNUNET_CRYPTO_hash_context_start(), GNUNET_ERROR_TYPE_DEBUG, and GNUNET_log.

Referenced by sign_hello().

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◆ sign_hello()

static void sign_hello	(	const struct GNUNET_HELLO_Builder *	builder,
		struct GNUNET_TIME_Timestamp	et,
		const struct GNUNET_CRYPTO_EddsaPrivateKey *	priv,
		struct GNUNET_CRYPTO_EddsaSignature *	sig
	)

static

Create HELLO signature.

Parameters

	builder	the builder to use
	et	expiration time to sign
	priv	key to sign with
[out]	sig	where to write the signature

Definition at line 248 of file hello-uri.c.

 {
   struct HelloSignaturePurpose hsp = {
     .purpose.size = htonl (sizeof (hsp)),
     .purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_HELLO),
     .expiration_time = GNUNET_TIME_absolute_hton (et.abs_time)
   };
  
   hash_addresses (builder,
                   &hsp.h_addrs);
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Address hash is %s\n",
               GNUNET_h2s_full (&hsp.h_addrs));
   GNUNET_CRYPTO_eddsa_sign (priv,
                             &hsp,
                             sig);
 }

References GNUNET_TIME_Timestamp::abs_time, builder, GNUNET_CRYPTO_eddsa_sign, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s_full(), GNUNET_log, GNUNET_SIGNATURE_PURPOSE_HELLO, GNUNET_TIME_absolute_hton(), HelloSignaturePurpose::h_addrs, hash_addresses(), HelloSignaturePurpose::purpose, and GNUNET_CRYPTO_EccSignaturePurpose::size.

Referenced by GNUNET_HELLO_builder_add_address().

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◆ verify_hello()

static enum GNUNET_GenericReturnValue verify_hello	(	const struct GNUNET_HELLO_Builder *	builder,
		struct GNUNET_TIME_Absolute	et,
		const struct GNUNET_CRYPTO_EddsaSignature *	sig
	)

static

Verify HELLO signature.

Parameters

builder	the builder to use
et	expiration time to verify
sig	signature to verify

Returns: GNUNET_OK if everything is ok, GNUNET_NO if the HELLO expired, GNUNET_SYSERR if the signature is wrong

Definition at line 248 of file hello-uri.c.

 {
   struct HelloSignaturePurpose hsp = {
     .purpose.size = htonl (sizeof (hsp)),
     .purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_HELLO),
     .expiration_time = GNUNET_TIME_absolute_hton (et)
   };
  
   hash_addresses (builder,
                   &hsp.h_addrs);
   if (GNUNET_OK !=
       GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_HELLO,
                                   &hsp,
                                   sig,
                                   &builder->pid.public_key))
   {
     GNUNET_break_op (0);
     return GNUNET_SYSERR;
   }
   if (GNUNET_TIME_absolute_is_past (et))
     return GNUNET_NO;
   return GNUNET_OK;
 }

Referenced by GNUNET_HELLO_builder_from_block(), and GNUNET_HELLO_builder_from_url().

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Data Structures

Functions

Detailed Description

Function Documentation

◆ hash_addresses()

◆ sign_hello()

◆ verify_hello()