2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
23 * @brief helper library for handling HELLOs
24 * @author Christian Grothoff
27 #include "gnunet_hello_lib.h"
28 #include "gnunet_protocols.h"
29 #include "gnunet_util_lib.h"
30 #include "gnunet_transport_plugin.h"
32 GNUNET_NETWORK_STRUCT_BEGIN
35 * A HELLO message is used to exchange information about
36 * transports with other peers. This struct is always
37 * followed by the actual network addresses which have
40 * 1) transport-name (0-terminated)
41 * 2) address-length (uint16_t, network byte order; possibly
43 * 3) address expiration (GNUNET_TIME_AbsoluteNBO); possibly
45 * 4) address (address-length bytes; possibly unaligned!)
47 struct GNUNET_HELLO_Message
50 * Type will be GNUNET_MESSAGE_TYPE_HELLO.
52 struct GNUNET_MessageHeader header;
55 * Always zero (for alignment).
57 uint32_t reserved GNUNET_PACKED;
60 * The public key of the peer.
62 struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded publicKey;
65 GNUNET_NETWORK_STRUCT_END
69 * Context used for building our own URI.
71 struct GNUNET_HELLO_ComposeUriContext
79 * Function for finding transport plugins by name.
81 GNUNET_HELLO_TransportPluginsFind plugins_find;
86 * Context for 'add_address_to_hello'.
88 struct GNUNET_HELLO_ParseUriContext
91 * Position in the URI with the next address to parse.
96 * Set to GNUNET_SYSERR to indicate parse errors.
101 * Function for finding transport plugins by name.
103 GNUNET_HELLO_TransportPluginsFind plugins_find;
110 * @param h HELLO Message to test
111 * @return GNUNET_MESSAGE_TYPE_HELLO or GNUNET_MESSAGE_TYPE_FRIEND_HELLO or 0 on error
114 GNUNET_HELLO_get_type (const struct GNUNET_HELLO_Message *h)
116 if (GNUNET_MESSAGE_TYPE_HELLO == ntohs(h->header.type))
117 return GNUNET_MESSAGE_TYPE_HELLO;
118 if (GNUNET_MESSAGE_TYPE_FRIEND_HELLO == ntohs(h->header.type))
119 return GNUNET_MESSAGE_TYPE_FRIEND_HELLO;
125 * Copy the given address information into
126 * the given buffer using the format of HELLOs.
128 * @param address the address
129 * @param expiration expiration for the address
130 * @param target where to copy the address
131 * @param max maximum number of bytes to copy to target
132 * @return number of bytes copied, 0 if
133 * the target buffer was not big enough.
136 GNUNET_HELLO_add_address (const struct GNUNET_HELLO_Address *address,
137 struct GNUNET_TIME_Absolute expiration, char *target,
142 struct GNUNET_TIME_AbsoluteNBO exp;
144 slen = strlen (address->transport_name) + 1;
145 if (slen + sizeof (uint16_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) +
146 address->address_length > max)
148 exp = GNUNET_TIME_absolute_hton (expiration);
149 alen = htons ((uint16_t) address->address_length);
150 memcpy (target, address->transport_name, slen);
151 memcpy (&target[slen], &alen, sizeof (uint16_t));
152 slen += sizeof (uint16_t);
153 memcpy (&target[slen], &exp, sizeof (struct GNUNET_TIME_AbsoluteNBO));
154 slen += sizeof (struct GNUNET_TIME_AbsoluteNBO);
155 memcpy (&target[slen], address->address, address->address_length);
156 slen += address->address_length;
162 * Get the size of an address entry in a HELLO message.
164 * @param buf pointer to the start of the address entry
165 * @param max maximum size of the entry (end of buf)
166 * @param ralen set to the address length
167 * @return size of the entry, or 0 if max is not large enough
170 get_hello_address_size (const char *buf, size_t max, uint16_t * ralen)
180 while ((left > 0) && ('\0' != *pos))
188 /* 0-termination not found */
193 if (left < sizeof (uint16_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO))
195 /* not enough space for addrlen */
199 memcpy (&alen, pos, sizeof (uint16_t));
202 slen += alen + sizeof (uint16_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO);
205 /* not enough space for addr */
214 * Construct a HELLO message given the public key,
215 * expiration time and an iterator that spews the
216 * transport addresses.
218 * @return the hello message
220 struct GNUNET_HELLO_Message *
221 GNUNET_HELLO_create (const struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded
223 GNUNET_HELLO_GenerateAddressListCallback addrgen,
227 char buffer[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1 - 256 -
228 sizeof (struct GNUNET_HELLO_Message)];
232 struct GNUNET_HELLO_Message *hello;
234 max = sizeof (buffer);
238 while (0 != (ret = addrgen (addrgen_cls, max, &buffer[used])))
244 hello = GNUNET_malloc (sizeof (struct GNUNET_HELLO_Message) + used);
245 if (GNUNET_NO == friend_only)
246 hello->header.type = htons (GNUNET_MESSAGE_TYPE_HELLO);
248 hello->header.type = htons (GNUNET_MESSAGE_TYPE_FRIEND_HELLO);
249 hello->header.size = htons (sizeof (struct GNUNET_HELLO_Message) + used);
250 memcpy (&hello->publicKey, publicKey,
251 sizeof (struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded));
252 memcpy (&hello[1], buffer, used);
258 * Iterate over all of the addresses in the HELLO.
260 * @param msg HELLO to iterate over
261 * @param return_modified if a modified copy should be returned,
262 * otherwise NULL will be returned
263 * @param it iterator to call on each address
264 * @param it_cls closure for it
266 struct GNUNET_HELLO_Message *
267 GNUNET_HELLO_iterate_addresses (const struct GNUNET_HELLO_Message *msg,
269 GNUNET_HELLO_AddressIterator it, void *it_cls)
271 struct GNUNET_HELLO_Address address;
273 struct GNUNET_HELLO_Message *ret;
280 struct GNUNET_TIME_AbsoluteNBO expire;
283 msize = GNUNET_HELLO_size (msg);
284 if ((msize < sizeof (struct GNUNET_HELLO_Message)) ||
285 ((ntohs (msg->header.type) != GNUNET_MESSAGE_TYPE_HELLO) &&
286 (ntohs (msg->header.type) != GNUNET_MESSAGE_TYPE_FRIEND_HELLO)))
291 ret = GNUNET_malloc (msize);
292 memcpy (ret, msg, msize);
294 inptr = (const char *) &msg[1];
295 insize = msize - sizeof (struct GNUNET_HELLO_Message);
297 woff = (ret != NULL) ? (char *) &ret[1] : NULL;
298 GNUNET_CRYPTO_hash (&msg->publicKey,
299 sizeof (struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded),
300 &address.peer.hashPubKey);
303 esize = get_hello_address_size (inptr, insize, &alen);
307 GNUNET_free_non_null (ret);
311 &inptr[esize - alen - sizeof (struct GNUNET_TIME_AbsoluteNBO)],
312 sizeof (struct GNUNET_TIME_AbsoluteNBO));
313 address.address = &inptr[esize - alen];
314 address.address_length = alen;
315 address.transport_name = inptr;
316 iret = it (it_cls, &address, GNUNET_TIME_absolute_ntoh (expire));
317 if (iret == GNUNET_SYSERR)
320 ret->header.size = ntohs (sizeof (struct GNUNET_HELLO_Message) + wpos);
323 if ((iret == GNUNET_OK) && (ret != NULL))
325 memcpy (woff, inptr, esize);
333 ret->header.size = ntohs (sizeof (struct GNUNET_HELLO_Message) + wpos);
340 const struct GNUNET_HELLO_Address *address;
342 struct GNUNET_TIME_Absolute expiration;
347 get_match_exp (void *cls, const struct GNUNET_HELLO_Address *address,
348 struct GNUNET_TIME_Absolute expiration)
350 struct ExpireContext *ec = cls;
352 if (0 == GNUNET_HELLO_address_cmp (address, ec->address))
354 ec->found = GNUNET_YES;
355 ec->expiration = expiration;
356 return GNUNET_SYSERR; /* done here */
364 const struct GNUNET_HELLO_Message *h1;
365 const struct GNUNET_HELLO_Message *h2;
366 const struct GNUNET_HELLO_Message *other;
376 copy_latest (void *cls, const struct GNUNET_HELLO_Address *address,
377 struct GNUNET_TIME_Absolute expiration)
379 struct MergeContext *mc = cls;
380 struct ExpireContext ec;
382 ec.address = address;
383 ec.found = GNUNET_NO;
384 GNUNET_HELLO_iterate_addresses (mc->other, GNUNET_NO, &get_match_exp, &ec);
385 if ((ec.found == GNUNET_NO) ||
386 (ec.expiration.abs_value < expiration.abs_value) ||
387 ((ec.expiration.abs_value == expiration.abs_value) &&
388 (mc->take_equal == GNUNET_YES)))
391 GNUNET_HELLO_add_address (address, expiration, &mc->buf[mc->ret],
399 merge_addr (void *cls, size_t max, void *buf)
401 struct MergeContext *mc = cls;
408 mc->take_equal = GNUNET_NO;
410 GNUNET_HELLO_iterate_addresses (mc->h1, GNUNET_NO, ©_latest, mc);
411 mc->take_equal = GNUNET_YES;
413 GNUNET_HELLO_iterate_addresses (mc->h2, GNUNET_NO, ©_latest, mc);
420 * Construct a HELLO message by merging the
421 * addresses in two existing HELLOs (which
422 * must be for the same peer).
424 * @param h1 first HELLO message
425 * @param h2 the second HELLO message
426 * @return the combined hello message
428 struct GNUNET_HELLO_Message *
429 GNUNET_HELLO_merge (const struct GNUNET_HELLO_Message *h1,
430 const struct GNUNET_HELLO_Message *h2)
432 struct MergeContext mc = { h1, h2, NULL, NULL, 0, 0, 0 };
434 if (h1->header.type != h2->header.type)
436 /* Trying to merge different HELLO types */
440 if (GNUNET_MESSAGE_TYPE_HELLO == (ntohs(h1->header.type)))
441 friend_only = GNUNET_NO;
442 else if (GNUNET_MESSAGE_TYPE_FRIEND_HELLO == (ntohs(h1->header.type)))
443 friend_only = GNUNET_YES;
450 return GNUNET_HELLO_create (&h1->publicKey, &merge_addr, &mc, friend_only);
456 struct GNUNET_TIME_Absolute expiration_limit;
458 GNUNET_HELLO_AddressIterator it;
462 const struct GNUNET_HELLO_Message *old_hello;
467 delta_match (void *cls, const struct GNUNET_HELLO_Address *address,
468 struct GNUNET_TIME_Absolute expiration)
470 struct DeltaContext *dc = cls;
472 struct ExpireContext ec;
474 ec.address = address;
475 ec.found = GNUNET_NO;
476 GNUNET_HELLO_iterate_addresses (dc->old_hello, GNUNET_NO, &get_match_exp,
478 if ((ec.found == GNUNET_YES) &&
479 ((ec.expiration.abs_value > expiration.abs_value) ||
480 (ec.expiration.abs_value >= dc->expiration_limit.abs_value)))
481 return GNUNET_YES; /* skip */
482 ret = dc->it (dc->it_cls, address, expiration);
488 * Iterate over addresses in "new_hello" that
489 * are NOT already present in "old_hello".
491 * @param new_hello a HELLO message
492 * @param old_hello a HELLO message
493 * @param expiration_limit ignore addresses in old_hello
494 * that expired before the given time stamp
495 * @param it iterator to call on each address
496 * @param it_cls closure for it
499 GNUNET_HELLO_iterate_new_addresses (const struct GNUNET_HELLO_Message
501 const struct GNUNET_HELLO_Message
503 struct GNUNET_TIME_Absolute
505 GNUNET_HELLO_AddressIterator it,
508 struct DeltaContext dc;
510 dc.expiration_limit = expiration_limit;
513 dc.old_hello = old_hello;
514 GNUNET_HELLO_iterate_addresses (new_hello, GNUNET_NO, &delta_match, &dc);
519 * Return the size of the given HELLO message.
520 * @param hello to inspect
521 * @return the size, 0 if HELLO is invalid
524 GNUNET_HELLO_size (const struct GNUNET_HELLO_Message *hello)
526 uint16_t ret = ntohs (hello->header.size);
528 if ((ret < sizeof (struct GNUNET_HELLO_Message)) ||
529 ((ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_HELLO) &&
530 (ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_FRIEND_HELLO)))
537 * Get the public key from a HELLO message.
539 * @param hello the hello message
540 * @param publicKey where to copy the public key information, can be NULL
541 * @return GNUNET_SYSERR if the HELLO was malformed
544 GNUNET_HELLO_get_key (const struct GNUNET_HELLO_Message *hello,
545 struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded *publicKey)
547 uint16_t ret = ntohs (hello->header.size);
549 if ((ret < sizeof (struct GNUNET_HELLO_Message)) ||
550 ((ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_HELLO) &&
551 (ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_FRIEND_HELLO)))
552 return GNUNET_SYSERR;
553 *publicKey = hello->publicKey;
559 * Get the peer identity from a HELLO message.
561 * @param hello the hello message
562 * @param peer where to store the peer's identity
563 * @return GNUNET_SYSERR if the HELLO was malformed
566 GNUNET_HELLO_get_id (const struct GNUNET_HELLO_Message *hello,
567 struct GNUNET_PeerIdentity *peer)
569 uint16_t ret = ntohs (hello->header.size);
571 if ((ret < sizeof (struct GNUNET_HELLO_Message)) ||
572 ((ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_HELLO) &&
573 (ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_FRIEND_HELLO)))
574 return GNUNET_SYSERR;
575 GNUNET_CRYPTO_hash (&hello->publicKey,
576 sizeof (struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded),
583 * Get the header from a HELLO message, used so other code
584 * can correctly send HELLO messages.
586 * @param hello the hello message
588 * @return header or NULL if the HELLO was malformed
590 struct GNUNET_MessageHeader *
591 GNUNET_HELLO_get_header (struct GNUNET_HELLO_Message *hello)
593 uint16_t ret = ntohs (hello->header.size);
595 if ((ret < sizeof (struct GNUNET_HELLO_Message)) ||
596 ((ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_HELLO) &&
597 (ntohs (hello->header.type) != GNUNET_MESSAGE_TYPE_FRIEND_HELLO)))
600 return &hello->header;
606 struct GNUNET_TIME_Absolute expiration_limit;
608 struct GNUNET_TIME_Absolute result;
610 const struct GNUNET_HELLO_Message *h2;
612 const struct GNUNET_HELLO_Address *address;
614 struct GNUNET_TIME_Absolute expiration;
622 find_other_matching (void *cls, const struct GNUNET_HELLO_Address *address,
623 struct GNUNET_TIME_Absolute expiration)
625 struct EqualsContext *ec = cls;
627 if (expiration.abs_value < ec->expiration_limit.abs_value)
629 if (0 == GNUNET_HELLO_address_cmp (address, ec->address))
631 ec->found = GNUNET_YES;
632 if (expiration.abs_value < ec->expiration.abs_value)
633 ec->result = GNUNET_TIME_absolute_min (expiration, ec->result);
634 return GNUNET_SYSERR;
641 find_matching (void *cls, const struct GNUNET_HELLO_Address *address,
642 struct GNUNET_TIME_Absolute expiration)
644 struct EqualsContext *ec = cls;
646 if (expiration.abs_value < ec->expiration_limit.abs_value)
648 ec->address = address;
649 ec->expiration = expiration;
650 ec->found = GNUNET_NO;
651 GNUNET_HELLO_iterate_addresses (ec->h2, GNUNET_NO, &find_other_matching, ec);
652 if (ec->found == GNUNET_NO)
654 ec->result = GNUNET_TIME_UNIT_ZERO_ABS;
655 return GNUNET_SYSERR;
662 * Test if two HELLO messages contain the same addresses.
663 * If they only differ in expiration time, the lowest
664 * expiration time larger than 'now' where they differ
667 * @param h1 first HELLO message
668 * @param h2 the second HELLO message
669 * @param now time to use for deciding which addresses have
670 * expired and should not be considered at all
671 * @return absolute time forever if the two HELLOs are
672 * totally identical; smallest timestamp >= now if
673 * they only differ in timestamps;
674 * zero if the some addresses with expirations >= now
675 * do not match at all
677 struct GNUNET_TIME_Absolute
678 GNUNET_HELLO_equals (const struct GNUNET_HELLO_Message *h1,
679 const struct GNUNET_HELLO_Message *h2,
680 struct GNUNET_TIME_Absolute now)
682 struct EqualsContext ec;
684 if (h1->header.type != h2->header.type)
685 return GNUNET_TIME_UNIT_ZERO_ABS;
688 memcmp (&h1->publicKey, &h2->publicKey,
689 sizeof (struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded)))
690 return GNUNET_TIME_UNIT_ZERO_ABS;
691 ec.expiration_limit = now;
692 ec.result = GNUNET_TIME_UNIT_FOREVER_ABS;
694 GNUNET_HELLO_iterate_addresses (h1, GNUNET_NO, &find_matching, &ec);
695 if (ec.result.abs_value == GNUNET_TIME_UNIT_ZERO.rel_value)
698 GNUNET_HELLO_iterate_addresses (h2, GNUNET_NO, &find_matching, &ec);
704 find_min_expire (void *cls, const struct GNUNET_HELLO_Address *address,
705 struct GNUNET_TIME_Absolute expiration)
707 struct GNUNET_TIME_Absolute *min = cls;
709 *min = GNUNET_TIME_absolute_min (*min, expiration);
715 * When does the last address in the given HELLO expire?
717 * @param msg HELLO to inspect
718 * @return time the last address expires, 0 if there are no addresses in the HELLO
720 struct GNUNET_TIME_Absolute
721 GNUNET_HELLO_get_last_expiration (const struct GNUNET_HELLO_Message *msg)
723 struct GNUNET_TIME_Absolute ret;
726 GNUNET_HELLO_iterate_addresses (msg, GNUNET_NO, &find_min_expire, &ret);
731 * GNUnet URIs are of the general form "gnunet://MODULE/IDENTIFIER".
732 * The specific structure of "IDENTIFIER" depends on the module and
733 * maybe differenciated into additional subcategories if applicable.
734 * This module only deals with hello identifiers (MODULE = "hello").
737 * The concrete URI format is:
739 * "gnunet://hello/PEER[!YYYYMMDDHHMMSS!<TYPE>!<ADDRESS>]...".
740 * These URIs can be used to add a peer record to peerinfo service.
741 * PEER is the string representation of peer's public key.
742 * YYYYMMDDHHMMSS is the expiration date.
743 * TYPE is a transport type.
744 * ADDRESS is the address, its format depends upon the transport type.
745 * The concrete transport types and corresponding address formats are:
749 * <TCP|UDP>!IPADDRESS
750 * IPVDDRESS is either IPV4 .-delimited address in form of XXX.XXX.XXX.XXX:PPPPP
751 * or IPV6 :-delimited address, but with '(' and ')' instead of '[' and ']' (RFC2396 advises against using square brackets in URIs):
752 * (XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX):PPPPP
753 * PPPPP is the port number. May be 0.
757 * [add SMTP, HTTP and other addresses here]
761 * The encoding for hexadecimal values is defined in the crypto_hash.c
762 * module in the gnunetutil library and discussed there.
766 * gnunet://hello/0430205UC7D56PTQK8NV05776671CNN44FK4TL6D0GQ35OMF8MEN4RNMKA5UF6AL3DQO8B1SC5AQF50SQ2MABIRU4HC8H2HAJKJ59JL1JVRJAK308F9GASRFLMGUBB5TQ5AKR94AS5T3MDG8B9O1EMPRKB0HVCG7T6QPP4CDJ913LAEHVJ2DI1TOBB15Q1JIT5ARBOD12U4SIGRFDV3Q7T66G4TBVSJJ90UQF1BG29TGJJKLGEIMSPHHKO544D6EALQ4F2K0416311JC22GVAD48R616I7VK03K7MP7N0RS2MBV1TE9JV8CK1LSQMR7KCDRTLDA6917UGA67DHTGHERIACCGQ54TGSR48RMSGS9BA5HLMOKASFC1I6V4TT09TUGCU8GNDHQF0JF3H7LPV59UL5I38QID040G000!20120302010059!TCP!192.168.0.1:2086!TCP!64.23.8.174:0
767 * gnunet://hello/0430205UC7D56PTQK8NV05776671CNN44FK4TL6D0GQ35OMF8MEN4RNMKA5UF6AL3DQO8B1SC5AQF50SQ2MABIRU4HC8H2HAJKJ59JL1JVRJAK308F9GASRFLMGUBB5TQ5AKR94AS5T3MDG8B9O1EMPRKB0HVCG7T6QPP4CDJ913LAEHVJ2DI1TOBB15Q1JIT5ARBOD12U4SIGRFDV3Q7T66G4TBVSJJ90UQF1BG29TGJJKLGEIMSPHHKO544D6EALQ4F2K0416311JC22GVAD48R616I7VK03K7MP7N0RS2MBV1TE9JV8CK1LSQMR7KCDRTLDA6917UGA67DHTGHERIACCGQ54TGSR48RMSGS9BA5HLMOKASFC1I6V4TT09TUGCU8GNDHQF0JF3H7LPV59UL5I38QID040G000!20120302010059!TCP!(2001:db8:85a3:8d3:1319:8a2e:370:7348):2086
773 /* ************************* Compose HELLO URI ************************** */
777 * Replace all characters in the input 'in' according
778 * to the mapping. The mapping says to map each character
779 * in 'oldchars' to the corresponding character (by offset)
782 * @param in input string to remap
783 * @param oldchars characters to replace
784 * @param newchars replacement characters, must have same length as 'oldchars'
785 * @return copy of string with replacement applied.
788 map_characters (const char *in,
789 const char *oldchars,
790 const char *newchars)
796 GNUNET_assert (strlen (oldchars) == strlen (newchars));
797 ret = GNUNET_strdup (in);
799 while (ret[i] != '\0')
801 off = strchr (oldchars, ret[i]);
803 ret[i] = newchars[off - oldchars];
811 * Function that is called on each address of this peer.
812 * Expands the corresponding URI string.
814 * @param cls the 'GNUNET_HELLO_GetUriContext'
815 * @param address address to add
816 * @param expiration expiration time for the address
817 * @return GNUNET_OK (continue iteration).
820 add_address_to_uri (void *cls, const struct GNUNET_HELLO_Address *address,
821 struct GNUNET_TIME_Absolute expiration)
823 struct GNUNET_HELLO_ComposeUriContext *ctx = cls;
824 struct GNUNET_TRANSPORT_PluginFunctions *papi;
832 papi = ctx->plugins_find (address->transport_name);
835 /* Not an error - we might just not have the right plugin. */
838 if (NULL == papi->address_to_string)
840 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
841 "URI conversion not implemented for plugin `%s'\n",
842 address->transport_name);
845 addr = papi->address_to_string (papi->cls, address->address, address->address_length);
846 if ( (addr == NULL) || (strlen(addr) == 0) )
848 /* For URIs we use '(' and ')' instead of '[' and ']' as brackets are reserved
849 characters in URIs */
850 uri_addr = map_characters (addr, "[]", "()");
851 seconds = expiration.abs_value / 1000;
852 t = gmtime (&seconds);
854 GNUNET_asprintf (&ret,
857 strftime (tbuf, sizeof (tbuf), "%Y%m%d%H%M%S", t) ? tbuf : "0",
858 address->transport_name,
860 GNUNET_free (uri_addr);
861 GNUNET_free (ctx->uri);
868 * Compose a hello URI string from a hello message.
870 * @param hello Hello message
871 * @param plugins_find Function to find transport plugins by name
872 * @return Hello URI string
875 GNUNET_HELLO_compose_uri (const struct GNUNET_HELLO_Message *hello,
876 GNUNET_HELLO_TransportPluginsFind plugins_find)
878 struct GNUNET_HELLO_ComposeUriContext ctx;
879 ctx.plugins_find = plugins_find;
881 char *pkey = GNUNET_CRYPTO_ecc_public_key_to_string (&(hello->publicKey));
882 GNUNET_asprintf (&(ctx.uri),
884 GNUNET_HELLO_URI_PREFIX,
888 GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO, &add_address_to_uri, &ctx);
893 /* ************************* Parse HELLO URI ********************* */
897 * We're building a HELLO. Parse the next address from the
898 * parsing context and append it.
900 * @param cls the 'struct GNUNET_HELLO_AddressParsingContext'
901 * @param max number of bytes available for HELLO construction
902 * @param buffer where to copy the next address (in binary format)
903 * @return number of bytes added to buffer
906 add_address_to_hello (void *cls, size_t max, void *buffer)
908 struct GNUNET_HELLO_ParseUriContext *ctx = cls;
912 char *plugin_address;
915 struct tm expiration_time;
916 time_t expiration_seconds;
917 struct GNUNET_TIME_Absolute expire;
918 struct GNUNET_TRANSPORT_PluginFunctions *papi;
921 struct GNUNET_HELLO_Address haddr;
924 if (NULL == ctx->pos)
926 if ('!' != ctx->pos[0])
928 ctx->ret = GNUNET_SYSERR;
934 if ('0' == ctx->pos[0] && '!' == ctx->pos[1])
936 expire = GNUNET_TIME_UNIT_FOREVER_ABS;
937 tname = ctx->pos + 1;
941 memset (&expiration_time, 0, sizeof (expiration_time));
942 tname = strptime (ctx->pos,
947 ctx->ret = GNUNET_SYSERR;
948 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
949 _("Failed to parse HELLO message: missing expiration time\n"));
954 expiration_seconds = mktime (&expiration_time);
955 if (expiration_seconds == (time_t) -1)
957 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
958 _("Failed to parse HELLO message: invalid expiration time\n"));
959 ctx->ret = GNUNET_SYSERR;
963 expire.abs_value = expiration_seconds * 1000;
967 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
968 _("Failed to parse HELLO message: malformed\n"));
969 ctx->ret = GNUNET_SYSERR;
974 address = strchr (tname, (int) '!');
977 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
978 _("Failed to parse HELLO message: missing transport plugin\n"));
979 ctx->ret = GNUNET_SYSERR;
984 end = strchr (address, (int) '!');
986 plugin_name = GNUNET_strndup (tname, address - (tname+1));
987 papi = ctx->plugins_find (plugin_name);
990 /* Not an error - we might just not have the right plugin.
991 * Skip this part, advance to the next one and recurse.
992 * But only if this is not the end of string.
994 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
995 _("Plugin `%s' not found\n"),
997 GNUNET_free (plugin_name);
1001 if (NULL == papi->string_to_address)
1003 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1004 _("Plugin `%s' does not support URIs yet\n"),
1006 GNUNET_free (plugin_name);
1010 uri_address = GNUNET_strndup (address, end - address);
1011 /* For URIs we use '(' and ')' instead of '[' and ']' as brackets are reserved
1012 characters in URIs; need to convert back to '[]' for the plugin */
1013 plugin_address = map_characters (uri_address, "()", "[]");
1014 GNUNET_free (uri_address);
1016 papi->string_to_address (papi->cls,
1018 strlen (plugin_address) + 1,
1022 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1023 _("Failed to parse `%s' as an address for plugin `%s'\n"),
1026 GNUNET_free (plugin_name);
1027 GNUNET_free (plugin_address);
1030 GNUNET_free (plugin_address);
1031 /* address.peer is unset - not used by add_address() */
1032 haddr.address_length = addr_len;
1033 haddr.address = addr;
1034 haddr.transport_name = plugin_name;
1035 ret = GNUNET_HELLO_add_address (&haddr, expire, buffer, max);
1037 GNUNET_free (plugin_name);
1043 * Parse a hello URI string to a hello message.
1045 * @param uri URI string to parse
1046 * @param pubkey Pointer to struct where public key is parsed
1047 * @param hello Pointer to struct where hello message is parsed
1048 * @param plugins_find Function to find transport plugins by name
1049 * @return GNUNET_OK on success, GNUNET_SYSERR if the URI was invalid, GNUNET_NO on other errors
1052 GNUNET_HELLO_parse_uri (const char *uri,
1053 struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded *pubkey,
1054 struct GNUNET_HELLO_Message **hello,
1055 GNUNET_HELLO_TransportPluginsFind plugins_find)
1060 struct GNUNET_HELLO_ParseUriContext ctx;
1062 if (0 == strncmp (uri,
1063 GNUNET_HELLO_URI_PREFIX,
1064 strlen (GNUNET_HELLO_URI_PREFIX)))
1066 pks = &uri[strlen (GNUNET_HELLO_URI_PREFIX)];
1067 friend_only = GNUNET_NO;
1069 else if (0 == strncmp (uri,
1070 GNUNET_FRIEND_HELLO_URI_PREFIX,
1071 strlen (GNUNET_FRIEND_HELLO_URI_PREFIX)))
1073 pks = &uri[strlen (GNUNET_FRIEND_HELLO_URI_PREFIX)];
1074 friend_only = GNUNET_YES;
1077 return GNUNET_SYSERR;
1078 exc = strstr (pks, "!");
1081 GNUNET_STRINGS_string_to_data (pks,
1082 (NULL == exc) ? strlen (pks) : (exc - pks),
1083 (unsigned char *) pubkey,
1085 return GNUNET_SYSERR;
1088 ctx.ret = GNUNET_OK;
1089 ctx.plugins_find = plugins_find;
1090 *hello = GNUNET_HELLO_create (pubkey, &add_address_to_hello, &ctx, friend_only);
1096 /* end of hello.c */