X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=src%2Fhello%2Fhello.c;h=e964ec1a3312d67f80e8c46ffc614570dbdcb7e8;hb=0778d7e951b20f42af01597ae41ba8d2d26857d0;hp=79d0edf8dac6049265d8fab6d9c7315fbd97a39f;hpb=120afa6058ba579887a9b417ec86cf06926d765e;p=oweals%2Fgnunet.git diff --git a/src/hello/hello.c b/src/hello/hello.c index 79d0edf8d..e964ec1a3 100644 --- a/src/hello/hello.c +++ b/src/hello/hello.c @@ -4,7 +4,7 @@ GNUnet is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published - by the Free Software Foundation; either version 2, or (at your + by the Free Software Foundation; either version 3, or (at your option) any later version. GNUnet is distributed in the hope that it will be useful, but @@ -26,7 +26,10 @@ #include "platform.h" #include "gnunet_hello_lib.h" #include "gnunet_protocols.h" -#include "gnunet_server_lib.h" +#include "gnunet_util_lib.h" +#include "gnunet_transport_plugin.h" + +GNUNET_NETWORK_STRUCT_BEGIN /** * A HELLO message is used to exchange information about @@ -35,68 +38,120 @@ * the format: * * 1) transport-name (0-terminated) - * 2) address-length (uint32_t, network byte order; possibly + * 2) address-length (uint16_t, network byte order; possibly * unaligned!) - * 3) address expiration (GNUNET_TIME_AbsoluteNBO); possibly + * 3) address expiration (`struct GNUNET_TIME_AbsoluteNBO`); possibly * unaligned!) * 4) address (address-length bytes; possibly unaligned!) */ struct GNUNET_HELLO_Message { /** - * Type will be GNUNET_MESSAGE_TYPE_HELLO. + * Type will be #GNUNET_MESSAGE_TYPE_HELLO. */ struct GNUNET_MessageHeader header; /** - * Always zero (for alignment). + * Use in F2F mode: Do not gossip this HELLO message */ - uint32_t reserved GNUNET_PACKED; + uint32_t friend_only GNUNET_PACKED; /** * The public key of the peer. */ - struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey; + struct GNUNET_CRYPTO_EddsaPublicKey publicKey; + +}; +GNUNET_NETWORK_STRUCT_END + + +/** + * Context used for building our own URI. + */ +struct GNUNET_HELLO_ComposeUriContext +{ + /** + * Final URI. + */ + char *uri; + + /** + * Function for finding transport plugins by name. + */ + GNUNET_HELLO_TransportPluginsFind plugins_find; +}; + + +/** + * Context for 'add_address_to_hello'. + */ +struct GNUNET_HELLO_ParseUriContext +{ + /** + * Position in the URI with the next address to parse. + */ + const char *pos; + /** + * Set to #GNUNET_SYSERR to indicate parse errors. + */ + int ret; + + /** + * Function for finding transport plugins by name. + */ + GNUNET_HELLO_TransportPluginsFind plugins_find; }; +/** Return HELLO type + * + * @param h HELLO Message to test + * @return #GNUNET_YES or #GNUNET_NO + */ +int +GNUNET_HELLO_is_friend_only (const struct GNUNET_HELLO_Message *h) +{ + if (GNUNET_YES == ntohl(h->friend_only)) + return GNUNET_YES; + return GNUNET_NO; +} + + + /** * Copy the given address information into * the given buffer using the format of HELLOs. * - * @param tname name of the transport plugin - * @param expiration expiration for the address - * @param addr the address - * @param addr_len length of the address in bytes - * @param target where to copy the address + * @param address the address + * @param expiration expiration for the @a address + * @param target where to copy the @a address * @param max maximum number of bytes to copy to target * @return number of bytes copied, 0 if * the target buffer was not big enough. */ size_t -GNUNET_HELLO_add_address (const char *tname, - struct GNUNET_TIME_Absolute expiration, - const void *addr, - size_t addr_len, char *target, size_t max) +GNUNET_HELLO_add_address (const struct GNUNET_HELLO_Address *address, + struct GNUNET_TIME_Absolute expiration, char *target, + size_t max) { - uint32_t alen; + uint16_t alen; size_t slen; struct GNUNET_TIME_AbsoluteNBO exp; - slen = strlen (tname) + 1; - if (slen + sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) + - addr_len > max) + slen = strlen (address->transport_name) + 1; + if (slen + sizeof (uint16_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) + + address->address_length > max) return 0; exp = GNUNET_TIME_absolute_hton (expiration); - alen = htonl ((uint32_t) addr_len); - memcpy (target, tname, slen); - memcpy (&target[slen], &alen, sizeof (uint32_t)); - slen += sizeof (uint32_t); + alen = htons ((uint16_t) address->address_length); + memcpy (target, address->transport_name, slen); + memcpy (&target[slen], &alen, sizeof (uint16_t)); + slen += sizeof (uint16_t); memcpy (&target[slen], &exp, sizeof (struct GNUNET_TIME_AbsoluteNBO)); slen += sizeof (struct GNUNET_TIME_AbsoluteNBO); - memcpy (&target[slen], addr, addr_len); - slen += addr_len; + memcpy (&target[slen], address->address, address->address_length); + slen += address->address_length; return slen; } @@ -110,10 +165,12 @@ GNUNET_HELLO_add_address (const char *tname, * @return size of the entry, or 0 if max is not large enough */ static size_t -get_hello_address_size (const char *buf, size_t max, uint32_t * ralen) +get_hello_address_size (const char *buf, + size_t max, + uint16_t *ralen) { const char *pos; - uint32_t alen; + uint16_t alen; size_t left; size_t slen; @@ -121,35 +178,34 @@ get_hello_address_size (const char *buf, size_t max, uint32_t * ralen) pos = buf; slen = 1; while ((left > 0) && ('\0' != *pos)) - { - left--; - pos++; - slen++; - } - if ('\0' != *pos) - { - /* 0-termination not found */ - GNUNET_break_op (0); - abort (); - return 0; - } + { + left--; + pos++; + slen++; + } + if (0 == left) + { + /* 0-termination not found */ + GNUNET_break_op (0); + return 0; + } pos++; - if (left < sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO)) - { - /* not enough space for addrlen */ - GNUNET_break_op (0); - return 0; - } - memcpy (&alen, pos, sizeof (uint32_t)); - alen = ntohl (alen); + if (left < sizeof (uint16_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO)) + { + /* not enough space for addrlen */ + GNUNET_break_op (0); + return 0; + } + memcpy (&alen, pos, sizeof (uint16_t)); + alen = ntohs (alen); *ralen = alen; - slen += alen + sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO); + slen += alen + sizeof (uint16_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO); if (max < slen) - { - /* not enough space for addr */ - GNUNET_break_op (0); - return 0; - } + { + /* not enough space for addr */ + GNUNET_break_op (0); + return 0; + } return slen; } @@ -162,30 +218,38 @@ get_hello_address_size (const char *buf, size_t max, uint32_t * ralen) * @return the hello message */ struct GNUNET_HELLO_Message * -GNUNET_HELLO_create (const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded - *publicKey, +GNUNET_HELLO_create (const struct GNUNET_CRYPTO_EddsaPublicKey *publicKey, GNUNET_HELLO_GenerateAddressListCallback addrgen, - void *addrgen_cls) + void *addrgen_cls, + int friend_only) { - char buffer[GNUNET_SERVER_MAX_MESSAGE_SIZE - 256 - + char buffer[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1 - 256 - sizeof (struct GNUNET_HELLO_Message)]; size_t max; size_t used; size_t ret; struct GNUNET_HELLO_Message *hello; + GNUNET_assert (NULL != publicKey); + GNUNET_assert ((GNUNET_YES == friend_only) || (GNUNET_NO == friend_only)); + max = sizeof (buffer); used = 0; - while (0 != (ret = addrgen (addrgen_cls, max, &buffer[used]))) + if (addrgen != NULL) + { + while (0 != (ret = addrgen (addrgen_cls, max, &buffer[used]))) { max -= ret; used += ret; } + } hello = GNUNET_malloc (sizeof (struct GNUNET_HELLO_Message) + used); hello->header.type = htons (GNUNET_MESSAGE_TYPE_HELLO); hello->header.size = htons (sizeof (struct GNUNET_HELLO_Message) + used); + hello->friend_only = htonl (friend_only); + memcpy (&hello->publicKey, publicKey, - sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded)); + sizeof (struct GNUNET_CRYPTO_EddsaPublicKey)); memcpy (&hello[1], buffer, used); return hello; } @@ -198,13 +262,15 @@ GNUNET_HELLO_create (const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded * @param return_modified if a modified copy should be returned, * otherwise NULL will be returned * @param it iterator to call on each address - * @param it_cls closure for it + * @param it_cls closure for @a it + * @return modified HELLO message */ struct GNUNET_HELLO_Message * GNUNET_HELLO_iterate_addresses (const struct GNUNET_HELLO_Message *msg, int return_modified, GNUNET_HELLO_AddressIterator it, void *it_cls) { + struct GNUNET_HELLO_Address address; uint16_t msize; struct GNUNET_HELLO_Message *ret; const char *inptr; @@ -212,7 +278,7 @@ GNUNET_HELLO_iterate_addresses (const struct GNUNET_HELLO_Message *msg, size_t esize; size_t wpos; char *woff; - uint32_t alen; + uint16_t alen; struct GNUNET_TIME_AbsoluteNBO expire; int iret; @@ -222,46 +288,47 @@ GNUNET_HELLO_iterate_addresses (const struct GNUNET_HELLO_Message *msg, return NULL; ret = NULL; if (return_modified) - { - ret = GNUNET_malloc (msize); - memcpy (ret, msg, msize); - } + { + ret = GNUNET_malloc (msize); + memcpy (ret, msg, msize); + } inptr = (const char *) &msg[1]; insize = msize - sizeof (struct GNUNET_HELLO_Message); wpos = 0; woff = (ret != NULL) ? (char *) &ret[1] : NULL; + address.peer.public_key = msg->publicKey; while (insize > 0) + { + esize = get_hello_address_size (inptr, insize, &alen); + if (0 == esize) + { + GNUNET_break (0); + GNUNET_free_non_null (ret); + return NULL; + } + memcpy (&expire, + &inptr[esize - alen - sizeof (struct GNUNET_TIME_AbsoluteNBO)], + sizeof (struct GNUNET_TIME_AbsoluteNBO)); + address.address = &inptr[esize - alen]; + address.address_length = alen; + address.transport_name = inptr; + address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE; + iret = it (it_cls, &address, GNUNET_TIME_absolute_ntoh (expire)); + if (iret == GNUNET_SYSERR) { - esize = get_hello_address_size (inptr, insize, &alen); - if (esize == 0) - { - GNUNET_break (0); - GNUNET_free_non_null (ret); - return NULL; - } - memcpy (&expire, - &inptr[esize - alen - sizeof (struct GNUNET_TIME_AbsoluteNBO)], - sizeof (struct GNUNET_TIME_AbsoluteNBO)); - iret = it (it_cls, - inptr, - GNUNET_TIME_absolute_ntoh (expire), - &inptr[esize - alen], alen); - if (iret == GNUNET_SYSERR) - { - if (ret != NULL) - ret->header.size = - ntohs (sizeof (struct GNUNET_HELLO_Message) + wpos); - return ret; - } - if ((iret == GNUNET_OK) && (ret != NULL)) - { - memcpy (woff, inptr, esize); - woff += esize; - wpos += esize; - } - insize -= esize; - inptr += esize; + if (ret != NULL) + ret->header.size = ntohs (sizeof (struct GNUNET_HELLO_Message) + wpos); + return ret; } + if ((iret == GNUNET_OK) && (ret != NULL)) + { + memcpy (woff, inptr, esize); + woff += esize; + wpos += esize; + } + insize -= esize; + inptr += esize; + } if (ret != NULL) ret->header.size = ntohs (sizeof (struct GNUNET_HELLO_Message) + wpos); return ret; @@ -270,27 +337,24 @@ GNUNET_HELLO_iterate_addresses (const struct GNUNET_HELLO_Message *msg, struct ExpireContext { - const void *addr; - size_t addrlen; + const struct GNUNET_HELLO_Address *address; int found; struct GNUNET_TIME_Absolute expiration; }; static int -get_match_exp (void *cls, - const char *tname, - struct GNUNET_TIME_Absolute expiration, - const void *addr, size_t addrlen) +get_match_exp (void *cls, const struct GNUNET_HELLO_Address *address, + struct GNUNET_TIME_Absolute expiration) { struct ExpireContext *ec = cls; - if ((addrlen == ec->addrlen) && (0 == memcmp (addr, ec->addr, addrlen))) - { - ec->found = GNUNET_YES; - ec->expiration = expiration; - return GNUNET_SYSERR; /* done here */ - } + if (0 == GNUNET_HELLO_address_cmp (address, ec->address)) + { + ec->found = GNUNET_YES; + ec->expiration = expiration; + return GNUNET_SYSERR; /* done here */ + } return GNUNET_OK; } @@ -309,28 +373,24 @@ struct MergeContext static int -copy_latest (void *cls, - const char *tname, - struct GNUNET_TIME_Absolute expiration, - const void *addr, size_t addrlen) +copy_latest (void *cls, const struct GNUNET_HELLO_Address *address, + struct GNUNET_TIME_Absolute expiration) { struct MergeContext *mc = cls; struct ExpireContext ec; - ec.addr = addr; - ec.addrlen = addrlen; + ec.address = address; ec.found = GNUNET_NO; GNUNET_HELLO_iterate_addresses (mc->other, GNUNET_NO, &get_match_exp, &ec); if ((ec.found == GNUNET_NO) || - ((ec.expiration.value < expiration.value) || - ((ec.expiration.value == expiration.value) && - (mc->take_equal == GNUNET_YES)))) - mc->ret += GNUNET_HELLO_add_address (tname, - expiration, - addr, - addrlen, - &mc->buf[mc->ret], - mc->max - mc->ret); + (ec.expiration.abs_value_us < expiration.abs_value_us) || + ((ec.expiration.abs_value_us == expiration.abs_value_us) && + (mc->take_equal == GNUNET_YES))) + { + mc->ret += + GNUNET_HELLO_add_address (address, expiration, &mc->buf[mc->ret], + mc->max - mc->ret); + } return GNUNET_OK; } @@ -370,8 +430,14 @@ GNUNET_HELLO_merge (const struct GNUNET_HELLO_Message *h1, const struct GNUNET_HELLO_Message *h2) { struct MergeContext mc = { h1, h2, NULL, NULL, 0, 0, 0 }; + int friend_only; + + if (h1->friend_only != h2->friend_only) + friend_only = GNUNET_YES; /* One of the HELLOs is friend only */ + else + friend_only = ntohl (h1->friend_only); /* Both HELLO's have the same type */ - return GNUNET_HELLO_create (&h1->publicKey, &merge_addr, &mc); + return GNUNET_HELLO_create (&h1->publicKey, &merge_addr, &mc, friend_only); } @@ -388,25 +454,22 @@ struct DeltaContext static int -delta_match (void *cls, - const char *tname, - struct GNUNET_TIME_Absolute expiration, - const void *addr, size_t addrlen) +delta_match (void *cls, const struct GNUNET_HELLO_Address *address, + struct GNUNET_TIME_Absolute expiration) { struct DeltaContext *dc = cls; int ret; struct ExpireContext ec; - ec.addr = addr; - ec.addrlen = addrlen; + ec.address = address; ec.found = GNUNET_NO; - GNUNET_HELLO_iterate_addresses (dc->old_hello, - GNUNET_NO, &get_match_exp, &ec); + GNUNET_HELLO_iterate_addresses (dc->old_hello, GNUNET_NO, &get_match_exp, + &ec); if ((ec.found == GNUNET_YES) && - ((ec.expiration.value > expiration.value) || - (ec.expiration.value >= dc->expiration_limit.value))) + ((ec.expiration.abs_value_us > expiration.abs_value_us) || + (ec.expiration.abs_value_us >= dc->expiration_limit.abs_value_us))) return GNUNET_YES; /* skip */ - ret = dc->it (dc->it_cls, tname, expiration, addr, addrlen); + ret = dc->it (dc->it_cls, address, expiration); return ret; } @@ -451,6 +514,7 @@ uint16_t GNUNET_HELLO_size (const struct GNUNET_HELLO_Message *hello) { uint16_t ret = ntohs (hello->header.size); + if ((ret < sizeof (struct GNUNET_HELLO_Message)) || (ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_HELLO)) return 0; @@ -467,10 +531,10 @@ GNUNET_HELLO_size (const struct GNUNET_HELLO_Message *hello) */ int GNUNET_HELLO_get_key (const struct GNUNET_HELLO_Message *hello, - struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded - *publicKey) + struct GNUNET_CRYPTO_EddsaPublicKey *publicKey) { uint16_t ret = ntohs (hello->header.size); + if ((ret < sizeof (struct GNUNET_HELLO_Message)) || (ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_HELLO)) return GNUNET_SYSERR; @@ -479,5 +543,549 @@ GNUNET_HELLO_get_key (const struct GNUNET_HELLO_Message *hello, } +/** + * Get the peer identity from a HELLO message. + * + * @param hello the hello message + * @param peer where to store the peer's identity + * @return #GNUNET_SYSERR if the HELLO was malformed + */ +int +GNUNET_HELLO_get_id (const struct GNUNET_HELLO_Message *hello, + struct GNUNET_PeerIdentity *peer) +{ + uint16_t ret = ntohs (hello->header.size); + + if ((ret < sizeof (struct GNUNET_HELLO_Message)) || + (ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_HELLO)) + return GNUNET_SYSERR; + peer->public_key = hello->publicKey; + return GNUNET_OK; +} + + +/** + * Get the header from a HELLO message, used so other code + * can correctly send HELLO messages. + * + * @param hello the hello message + * + * @return header or NULL if the HELLO was malformed + */ +struct GNUNET_MessageHeader * +GNUNET_HELLO_get_header (struct GNUNET_HELLO_Message *hello) +{ + uint16_t ret = ntohs (hello->header.size); + + if ((ret < sizeof (struct GNUNET_HELLO_Message)) || + (ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_HELLO)) + return NULL; + + return &hello->header; +} + + +struct EqualsContext +{ + struct GNUNET_TIME_Absolute expiration_limit; + + struct GNUNET_TIME_Absolute result; + + const struct GNUNET_HELLO_Message *h2; + + const struct GNUNET_HELLO_Address *address; + + struct GNUNET_TIME_Absolute expiration; + + int found; + +}; + + +static int +find_other_matching (void *cls, const struct GNUNET_HELLO_Address *address, + struct GNUNET_TIME_Absolute expiration) +{ + struct EqualsContext *ec = cls; + + if (expiration.abs_value_us < ec->expiration_limit.abs_value_us) + return GNUNET_YES; + if (0 == GNUNET_HELLO_address_cmp (address, ec->address)) + { + ec->found = GNUNET_YES; + if (expiration.abs_value_us < ec->expiration.abs_value_us) + ec->result = GNUNET_TIME_absolute_min (expiration, ec->result); + return GNUNET_SYSERR; + } + return GNUNET_YES; +} + + +static int +find_matching (void *cls, const struct GNUNET_HELLO_Address *address, + struct GNUNET_TIME_Absolute expiration) +{ + struct EqualsContext *ec = cls; + + if (expiration.abs_value_us < ec->expiration_limit.abs_value_us) + return GNUNET_YES; + ec->address = address; + ec->expiration = expiration; + ec->found = GNUNET_NO; + GNUNET_HELLO_iterate_addresses (ec->h2, GNUNET_NO, &find_other_matching, ec); + if (ec->found == GNUNET_NO) + { + ec->result = GNUNET_TIME_UNIT_ZERO_ABS; + return GNUNET_SYSERR; + } + return GNUNET_OK; +} + + +/** + * Test if two HELLO messages contain the same addresses. + * If they only differ in expiration time, the lowest + * expiration time larger than 'now' where they differ + * is returned. + * + * @param h1 first HELLO message + * @param h2 the second HELLO message + * @param now time to use for deciding which addresses have + * expired and should not be considered at all + * @return absolute time forever if the two HELLOs are + * totally identical; smallest timestamp >= now if + * they only differ in timestamps; + * zero if the some addresses with expirations >= now + * do not match at all + */ +struct GNUNET_TIME_Absolute +GNUNET_HELLO_equals (const struct GNUNET_HELLO_Message *h1, + const struct GNUNET_HELLO_Message *h2, + struct GNUNET_TIME_Absolute now) +{ + struct EqualsContext ec; + + if (h1->header.type != h2->header.type) + return GNUNET_TIME_UNIT_ZERO_ABS; + + if (0 != + memcmp (&h1->publicKey, &h2->publicKey, + sizeof (struct GNUNET_CRYPTO_EddsaPublicKey))) + return GNUNET_TIME_UNIT_ZERO_ABS; + ec.expiration_limit = now; + ec.result = GNUNET_TIME_UNIT_FOREVER_ABS; + ec.h2 = h2; + GNUNET_HELLO_iterate_addresses (h1, GNUNET_NO, &find_matching, &ec); + if (ec.result.abs_value_us == GNUNET_TIME_UNIT_ZERO.rel_value_us) + return ec.result; + ec.h2 = h1; + GNUNET_HELLO_iterate_addresses (h2, GNUNET_NO, &find_matching, &ec); + return ec.result; +} + + +static int +find_max_expire (void *cls, const struct GNUNET_HELLO_Address *address, + struct GNUNET_TIME_Absolute expiration) +{ + struct GNUNET_TIME_Absolute *max = cls; + + *max = GNUNET_TIME_absolute_max (*max, expiration); + return GNUNET_OK; +} + + +/** + * When does the last address in the given HELLO expire? + * + * @param msg HELLO to inspect + * @return time the last address expires, 0 if there are no addresses in the HELLO + */ +struct GNUNET_TIME_Absolute +GNUNET_HELLO_get_last_expiration (const struct GNUNET_HELLO_Message *msg) +{ + struct GNUNET_TIME_Absolute ret; + + ret.abs_value_us = 0; + GNUNET_HELLO_iterate_addresses (msg, GNUNET_NO, &find_max_expire, &ret); + return ret; +} + +/** + * GNUnet URIs are of the general form "gnunet://MODULE/IDENTIFIER". + * The specific structure of "IDENTIFIER" depends on the module and + * maybe differenciated into additional subcategories if applicable. + * This module only deals with hello identifiers (MODULE = "hello"). + *
+ *
+ * The concrete URI format is:
+ *
+ * "gnunet://hello/PEER[!YYYYMMDDHHMMSS!
+ */
+
+
+/* ************************* Compose HELLO URI ************************** */
+
+
+/**
+ * Replace all characters in the input 'in' according
+ * to the mapping. The mapping says to map each character
+ * in 'oldchars' to the corresponding character (by offset)
+ * in 'newchars'.
+ *
+ * @param in input string to remap
+ * @param oldchars characters to replace
+ * @param newchars replacement characters, must have same length as 'oldchars'
+ * @return copy of string with replacement applied.
+ */
+static char *
+map_characters (const char *in,
+ const char *oldchars,
+ const char *newchars)
+{
+ char *ret;
+ const char *off;
+ size_t i;
+
+ GNUNET_assert (strlen (oldchars) == strlen (newchars));
+ ret = GNUNET_strdup (in);
+ i = 0;
+ while (ret[i] != '\0')
+ {
+ off = strchr (oldchars, ret[i]);
+ if (NULL != off)
+ ret[i] = newchars[off - oldchars];
+ i++;
+ }
+ return ret;
+}
+
+
+/**
+ * Function that is called on each address of this peer.
+ * Expands the corresponding URI string.
+ *
+ * @param cls the 'GNUNET_HELLO_GetUriContext'
+ * @param address address to add
+ * @param expiration expiration time for the address
+ * @return GNUNET_OK (continue iteration).
+ */
+static int
+add_address_to_uri (void *cls, const struct GNUNET_HELLO_Address *address,
+ struct GNUNET_TIME_Absolute expiration)
+{
+ struct GNUNET_HELLO_ComposeUriContext *ctx = cls;
+ struct GNUNET_TRANSPORT_PluginFunctions *papi;
+ const char *addr;
+ char *uri_addr;
+ char *ret;
+ char *addr_dup;
+ char *pos;
+ char tbuf[16] = "";
+ char *client_str = "_client";
+ struct tm *t;
+ time_t seconds;
+
+ papi = ctx->plugins_find (address->transport_name);
+ if (papi == NULL)
+ {
+ /* Not an error - we might just not have the right plugin. */
+ return GNUNET_OK;
+ }
+ if (NULL == papi->address_to_string)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "URI conversion not implemented for plugin `%s'\n",
+ address->transport_name);
+ return GNUNET_OK;
+ }
+ addr = papi->address_to_string (papi->cls, address->address, address->address_length);
+
+ if ( (addr == NULL) || (strlen(addr) == 0) )
+ return GNUNET_OK;
+
+ addr_dup = GNUNET_strdup (addr);
+ if (NULL != (pos = strstr (addr_dup, "_server")))
+ memcpy (pos, client_str, strlen(client_str)); /* Replace all server addresses with client addresses */
+
+ /* For URIs we use '(' and ')' instead of '[' and ']' as brackets are reserved
+ characters in URIs */
+ uri_addr = map_characters (addr_dup, "[]", "()");
+ GNUNET_free (addr_dup);
+ seconds = expiration.abs_value_us / 1000LL / 1000LL;
+ t = gmtime (&seconds);
+
+ GNUNET_asprintf (&ret,
+ "%s!%s!%s!%s",
+ ctx->uri,
+ strftime (tbuf, sizeof (tbuf), "%Y%m%d%H%M%S", t) ? tbuf : "0",
+ address->transport_name,
+ uri_addr);
+ GNUNET_free (uri_addr);
+ GNUNET_free (ctx->uri);
+ ctx->uri = ret;
+ return GNUNET_OK;
+}
+
+
+/**
+ * Compose a hello URI string from a hello message.
+ *
+ * @param hello Hello message
+ * @param plugins_find Function to find transport plugins by name
+ * @return Hello URI string
+ */
+char *
+GNUNET_HELLO_compose_uri (const struct GNUNET_HELLO_Message *hello,
+ GNUNET_HELLO_TransportPluginsFind plugins_find)
+{
+ struct GNUNET_HELLO_ComposeUriContext ctx;
+ ctx.plugins_find = plugins_find;
+
+ char *pkey = GNUNET_CRYPTO_eddsa_public_key_to_string (&(hello->publicKey));
+
+ GNUNET_asprintf (&(ctx.uri),
+ "%s%s",
+ (GNUNET_YES == GNUNET_HELLO_is_friend_only (hello)) ? GNUNET_FRIEND_HELLO_URI_PREFIX : GNUNET_HELLO_URI_PREFIX,
+ pkey);
+ GNUNET_free (pkey);
+
+ GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO, &add_address_to_uri, &ctx);
+ return ctx.uri;
+}
+
+
+/* ************************* Parse HELLO URI ********************* */
+
+
+/**
+ * We're building a HELLO. Parse the next address from the
+ * parsing context and append it.
+ *
+ * @param cls the 'struct GNUNET_HELLO_AddressParsingContext'
+ * @param max number of bytes available for HELLO construction
+ * @param buffer where to copy the next address (in binary format)
+ * @return number of bytes added to buffer
+ */
+static size_t
+add_address_to_hello (void *cls, size_t max, void *buffer)
+{
+ struct GNUNET_HELLO_ParseUriContext *ctx = cls;
+ const char *tname;
+ const char *address;
+ char *uri_address;
+ char *plugin_address;
+ const char *end;
+ char *plugin_name;
+ struct tm expiration_time;
+ time_t expiration_seconds;
+ struct GNUNET_TIME_Absolute expire;
+ struct GNUNET_TRANSPORT_PluginFunctions *papi;
+ void *addr;
+ size_t addr_len;
+ struct GNUNET_HELLO_Address haddr;
+ size_t ret;
+
+ if (NULL == ctx->pos)
+ return 0;
+ if ('!' != ctx->pos[0])
+ {
+ ctx->ret = GNUNET_SYSERR;
+ GNUNET_break (0);
+ return 0;
+ }
+ ctx->pos++;
+
+ if ('0' == ctx->pos[0] && '!' == ctx->pos[1])
+ {
+ expire = GNUNET_TIME_UNIT_FOREVER_ABS;
+ tname = ctx->pos + 1;
+ }
+ else
+ {
+ memset (&expiration_time, 0, sizeof (expiration_time));
+ tname = strptime (ctx->pos,
+ "%Y%m%d%H%M%S",
+ &expiration_time);
+ if (NULL == tname)
+ {
+ ctx->ret = GNUNET_SYSERR;
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to parse HELLO message: missing expiration time\n"));
+ GNUNET_break (0);
+ return 0;
+ }
+
+ expiration_seconds = mktime (&expiration_time);
+ if (expiration_seconds == (time_t) -1)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to parse HELLO message: invalid expiration time\n"));
+ ctx->ret = GNUNET_SYSERR;
+ GNUNET_break (0);
+ return 0;
+ }
+ expire.abs_value_us = expiration_seconds * 1000LL * 1000LL;
+ }
+ if ('!' != tname[0])
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to parse HELLO message: malformed\n"));
+ ctx->ret = GNUNET_SYSERR;
+ GNUNET_break (0);
+ return 0;
+ }
+ tname++;
+ address = strchr (tname, (int) '!');
+ if (NULL == address)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to parse HELLO message: missing transport plugin\n"));
+ ctx->ret = GNUNET_SYSERR;
+ GNUNET_break (0);
+ return 0;
+ }
+ address++;
+ end = strchr (address, (int) '!');
+ ctx->pos = end;
+ plugin_name = GNUNET_strndup (tname, address - (tname+1));
+ papi = ctx->plugins_find (plugin_name);
+ if (NULL == papi)
+ {
+ /* Not an error - we might just not have the right plugin.
+ * Skip this part, advance to the next one and recurse.
+ * But only if this is not the end of string.
+ */
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Plugin `%s' not found\n"),
+ plugin_name);
+ GNUNET_free (plugin_name);
+ GNUNET_break (0);
+ return 0;
+ }
+ if (NULL == papi->string_to_address)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Plugin `%s' does not support URIs yet\n"),
+ plugin_name);
+ GNUNET_free (plugin_name);
+ GNUNET_break (0);
+ return 0;
+ }
+ uri_address = GNUNET_strndup (address, end - address);
+ /* For URIs we use '(' and ')' instead of '[' and ']' as brackets are reserved
+ characters in URIs; need to convert back to '[]' for the plugin */
+ plugin_address = map_characters (uri_address, "()", "[]");
+ GNUNET_free (uri_address);
+ if (GNUNET_OK !=
+ papi->string_to_address (papi->cls,
+ plugin_address,
+ strlen (plugin_address) + 1,
+ &addr,
+ &addr_len))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to parse `%s' as an address for plugin `%s'\n"),
+ plugin_address,
+ plugin_name);
+ GNUNET_free (plugin_name);
+ GNUNET_free (plugin_address);
+ return 0;
+ }
+ GNUNET_free (plugin_address);
+ /* address.peer is unset - not used by add_address() */
+ haddr.address_length = addr_len;
+ haddr.address = addr;
+ haddr.transport_name = plugin_name;
+ ret = GNUNET_HELLO_add_address (&haddr, expire, buffer, max);
+ GNUNET_free (addr);
+ GNUNET_free (plugin_name);
+ return ret;
+}
+
+
+/**
+ * Parse a hello URI string to a hello message.
+ *
+ * @param uri URI string to parse
+ * @param pubkey Pointer to struct where public key is parsed
+ * @param hello Pointer to struct where hello message is parsed
+ * @param plugins_find Function to find transport plugins by name
+ * @return GNUNET_OK on success, GNUNET_SYSERR if the URI was invalid, GNUNET_NO on other errors
+ */
+int
+GNUNET_HELLO_parse_uri (const char *uri,
+ struct GNUNET_CRYPTO_EddsaPublicKey *pubkey,
+ struct GNUNET_HELLO_Message **hello,
+ GNUNET_HELLO_TransportPluginsFind plugins_find)
+{
+ const char *pks;
+ const char *exc;
+ int friend_only;
+ struct GNUNET_HELLO_ParseUriContext ctx;
+
+ if (0 == strncmp (uri,
+ GNUNET_HELLO_URI_PREFIX,
+ strlen (GNUNET_HELLO_URI_PREFIX)))
+ {
+ pks = &uri[strlen (GNUNET_HELLO_URI_PREFIX)];
+ friend_only = GNUNET_NO;
+ }
+ else if (0 == strncmp (uri,
+ GNUNET_FRIEND_HELLO_URI_PREFIX,
+ strlen (GNUNET_FRIEND_HELLO_URI_PREFIX)))
+ {
+ pks = &uri[strlen (GNUNET_FRIEND_HELLO_URI_PREFIX)];
+ friend_only = GNUNET_YES;
+ }
+ else
+ return GNUNET_SYSERR;
+ exc = strstr (pks, "!");
+
+ if (GNUNET_OK !=
+ GNUNET_STRINGS_string_to_data (pks,
+ (NULL == exc) ? strlen (pks) : (exc - pks),
+ (unsigned char *) pubkey,
+ sizeof (*pubkey)))
+ return GNUNET_SYSERR;
+
+ ctx.pos = exc;
+ ctx.ret = GNUNET_OK;
+ ctx.plugins_find = plugins_find;
+ *hello = GNUNET_HELLO_create (pubkey, &add_address_to_hello, &ctx, friend_only);
+
+ return ctx.ret;
+}
+
/* end of hello.c */
+ *
+ * The encoding for hexadecimal values is defined in the crypto_hash.c
+ * module in the gnunetutil library and discussed there.
+ *
+ * Examples:
+ *
+ * gnunet://hello/0430205UC7D56PTQK8NV05776671CNN44FK4TL6D0GQ35OMF8MEN4RNMKA5UF6AL3DQO8B1SC5AQF50SQ2MABIRU4HC8H2HAJKJ59JL1JVRJAK308F9GASRFLMGUBB5TQ5AKR94AS5T3MDG8B9O1EMPRKB0HVCG7T6QPP4CDJ913LAEHVJ2DI1TOBB15Q1JIT5ARBOD12U4SIGRFDV3Q7T66G4TBVSJJ90UQF1BG29TGJJKLGEIMSPHHKO544D6EALQ4F2K0416311JC22GVAD48R616I7VK03K7MP7N0RS2MBV1TE9JV8CK1LSQMR7KCDRTLDA6917UGA67DHTGHERIACCGQ54TGSR48RMSGS9BA5HLMOKASFC1I6V4TT09TUGCU8GNDHQF0JF3H7LPV59UL5I38QID040G000!20120302010059!TCP!192.168.0.1:2086!TCP!64.23.8.174:0
+ * gnunet://hello/0430205UC7D56PTQK8NV05776671CNN44FK4TL6D0GQ35OMF8MEN4RNMKA5UF6AL3DQO8B1SC5AQF50SQ2MABIRU4HC8H2HAJKJ59JL1JVRJAK308F9GASRFLMGUBB5TQ5AKR94AS5T3MDG8B9O1EMPRKB0HVCG7T6QPP4CDJ913LAEHVJ2DI1TOBB15Q1JIT5ARBOD12U4SIGRFDV3Q7T66G4TBVSJJ90UQF1BG29TGJJKLGEIMSPHHKO544D6EALQ4F2K0416311JC22GVAD48R616I7VK03K7MP7N0RS2MBV1TE9JV8CK1LSQMR7KCDRTLDA6917UGA67DHTGHERIACCGQ54TGSR48RMSGS9BA5HLMOKASFC1I6V4TT09TUGCU8GNDHQF0JF3H7LPV59UL5I38QID040G000!20120302010059!TCP!(2001:db8:85a3:8d3:1319:8a2e:370:7348):2086
+ *
+ *