2 * Routines for building lists of packets that are part of a "conversation"
6 * Wireshark - Network traffic analyzer
7 * By Gerald Combs <gerald@wireshark.org>
8 * Copyright 1998 Gerald Combs
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
35 #include "conversation.h"
38 * Hash table for conversations with no wildcards.
40 static GHashTable *conversation_hashtable_exact = NULL;
43 * Hash table for conversations with one wildcard address.
45 static GHashTable *conversation_hashtable_no_addr2 = NULL;
48 * Hash table for conversations with one wildcard port.
50 static GHashTable *conversation_hashtable_no_port2 = NULL;
53 * Hash table for conversations with one wildcard address and port.
55 static GHashTable *conversation_hashtable_no_addr2_or_port2 = NULL;
59 typedef struct conversation_key {
60 struct conversation_key *next;
69 * Linked list of conversation keys, so we can, before freeing them all,
70 * free the address data allocations associated with them.
72 static conversation_key *conversation_keys;
74 static guint32 new_index;
77 * Protocol-specific data attached to a conversation_t structure - protocol
78 * index and opaque pointer.
80 typedef struct _conv_proto_data {
86 * Creates a new conversation with known endpoints based on a conversation
87 * created with the CONVERSATION_TEMPLATE option while keeping the
88 * conversation created with the CONVERSATION_TEMPLATE option so it can still
89 * match future connections.
91 * Passing a pointer to a conversation whose options mask does not include
92 * CONVERSATION_TEMPLATE or where the conversation's protocol type (ptype)
93 * indicates a non-connnection oriented protocol will return the conversation
96 * addr2 and port2 are used in the function if their respective conversation
97 * options bits are set (NO_ADDR2 and NO_PORT2).
99 static conversation_t *
100 conversation_create_from_template(conversation_t *conversation, address *addr2, guint32 port2)
103 * Add a new conversation and keep the conversation template only if the
104 * CONVERSATION_TEMPLATE bit is set for a connection oriented protocol.
106 if(conversation->options & CONVERSATION_TEMPLATE &&
107 conversation->key_ptr->ptype != PT_UDP)
110 * Set up a new options mask where the conversation template bit and the
111 * bits for absence of a second address and port pair have been removed.
113 conversation_t *new_conversation_from_template;
114 guint options = conversation->options & ~(CONVERSATION_TEMPLATE | NO_ADDR2 | NO_PORT2);
117 * Are both the NO_ADDR2 and NO_PORT2 wildcards set in the options mask?
119 if(conversation->options & NO_ADDR2 &&
120 conversation->options & NO_PORT2)
123 * The conversation template was created without knowledge of both
124 * the second address as well as the second port. Create a new
125 * conversation with new 2nd address and 2nd port.
127 new_conversation_from_template =
128 conversation_new(conversation->setup_frame,
129 &conversation->key_ptr->addr1, addr2,
130 conversation->key_ptr->ptype, conversation->key_ptr->port1,
133 else if(conversation->options & NO_PORT2)
136 * The conversation template was created without knowledge of port 2
137 * only. Create a new conversation with new 2nd port.
139 new_conversation_from_template =
140 conversation_new(conversation->setup_frame,
141 &conversation->key_ptr->addr1, &conversation->key_ptr->addr2,
142 conversation->key_ptr->ptype, conversation->key_ptr->port1,
145 else if(conversation->options & NO_ADDR2)
148 * The conversation template was created without knowledge of address
149 * 2. Create a new conversation with new 2nd address.
151 new_conversation_from_template =
152 conversation_new(conversation->setup_frame,
153 &conversation->key_ptr->addr1, addr2,
154 conversation->key_ptr->ptype, conversation->key_ptr->port1,
155 conversation->key_ptr->port2, options);
160 * The CONVERSATION_TEMPLATE bit was set, but no other bit that the
161 * CONVERSATION_TEMPLATE bit controls is active. Just return the old
168 * Set the protocol dissector used for the template conversation as
169 * the handler of the new conversation as well.
171 new_conversation_from_template->dissector_handle = conversation->dissector_handle;
173 return new_conversation_from_template;
182 * Compute the hash value for two given address/port pairs if the match
186 conversation_hash_exact(gconstpointer v)
188 const conversation_key *key = (const conversation_key *)v;
192 ADD_ADDRESS_TO_HASH(hash_val, &key->addr1);
193 hash_val += key->port1;
194 ADD_ADDRESS_TO_HASH(hash_val, &key->addr2);
195 hash_val += key->port2;
201 * Compare two conversation keys for an exact match.
204 conversation_match_exact(gconstpointer v, gconstpointer w)
206 const conversation_key *v1 = (const conversation_key *)v;
207 const conversation_key *v2 = (const conversation_key *)w;
209 if (v1->ptype != v2->ptype)
210 return 0; /* different types of port */
213 * Are the first and second port 1 values the same, the first and
214 * second port 2 values the same, the first and second address
215 * 1 values the same, and the first and second address 2 values
218 if (v1->port1 == v2->port1 &&
219 v1->port2 == v2->port2 &&
220 ADDRESSES_EQUAL(&v1->addr1, &v2->addr1) &&
221 ADDRESSES_EQUAL(&v1->addr2, &v2->addr2)) {
223 * Yes. It's the same conversation, and the two
224 * address/port pairs are going in the same direction.
230 * Is the first port 2 the same as the second port 1, the first
231 * port 1 the same as the second port 2, the first address 2
232 * the same as the second address 1, and the first address 1
233 * the same as the second address 2?
235 if (v1->port2 == v2->port1 &&
236 v1->port1 == v2->port2 &&
237 ADDRESSES_EQUAL(&v1->addr2, &v2->addr1) &&
238 ADDRESSES_EQUAL(&v1->addr1, &v2->addr2)) {
240 * Yes. It's the same conversation, and the two
241 * address/port pairs are going in opposite directions.
247 * The addresses or the ports don't match.
253 * Compute the hash value for two given address/port pairs if the match
254 * has a wildcard address 2.
257 conversation_hash_no_addr2(gconstpointer v)
259 const conversation_key *key = (const conversation_key *)v;
263 ADD_ADDRESS_TO_HASH(hash_val, &key->addr1);
264 hash_val += key->port1;
265 hash_val += key->port2;
271 * Compare two conversation keys, except for the address 2 value.
272 * We don't check both directions of the conversation - the routine
273 * doing the hash lookup has to do two searches, as the hash key
274 * will be different for the two directions.
277 conversation_match_no_addr2(gconstpointer v, gconstpointer w)
279 const conversation_key *v1 = (const conversation_key *)v;
280 const conversation_key *v2 = (const conversation_key *)w;
282 if (v1->ptype != v2->ptype)
283 return 0; /* different types of port */
286 * Are the first and second port 1 values the same, the first and
287 * second port 2 valuess the same, and the first and second
288 * address 1 values the same?
290 if (v1->port1 == v2->port1 &&
291 v1->port2 == v2->port2 &&
292 ADDRESSES_EQUAL(&v1->addr1, &v2->addr1)) {
294 * Yes. It's the same conversation, and the two
295 * address/port pairs are going in the same direction.
301 * The addresses or the ports don't match.
307 * Compute the hash value for two given address/port pairs if the match
308 * has a wildcard port 2.
311 conversation_hash_no_port2(gconstpointer v)
313 const conversation_key *key = (const conversation_key *)v;
317 ADD_ADDRESS_TO_HASH(hash_val, &key->addr1);
318 hash_val += key->port1;
319 ADD_ADDRESS_TO_HASH(hash_val, &key->addr2);
325 * Compare two conversation keys, except for the port 2 value.
326 * We don't check both directions of the conversation - the routine
327 * doing the hash lookup has to do two searches, as the hash key
328 * will be different for the two directions.
331 conversation_match_no_port2(gconstpointer v, gconstpointer w)
333 const conversation_key *v1 = (const conversation_key *)v;
334 const conversation_key *v2 = (const conversation_key *)w;
336 if (v1->ptype != v2->ptype)
337 return 0; /* different types of port */
340 * Are the first and second port 1 values the same, the first and
341 * second address 1 values the same, and the first and second
342 * address 2 values the same?
344 if (v1->port1 == v2->port1 &&
345 ADDRESSES_EQUAL(&v1->addr1, &v2->addr1) &&
346 ADDRESSES_EQUAL(&v1->addr2, &v2->addr2)) {
348 * Yes. It's the same conversation, and the two
349 * address/port pairs are going in the same direction.
355 * The addresses or the ports don't match.
361 * Compute the hash value for two given address/port pairs if the match
362 * has a wildcard address 2 and port 2.
365 conversation_hash_no_addr2_or_port2(gconstpointer v)
367 const conversation_key *key = (const conversation_key *)v;
371 ADD_ADDRESS_TO_HASH(hash_val, &key->addr1);
372 hash_val += key->port1;
378 * Compare the address 1 and port 1 in the two conversation keys.
379 * We don't check both directions of the conversation - the routine
380 * doing the hash lookup has to do two searches, as the hash key
381 * will be different for the two directions.
384 conversation_match_no_addr2_or_port2(gconstpointer v, gconstpointer w)
386 const conversation_key *v1 = (const conversation_key *)v;
387 const conversation_key *v2 = (const conversation_key *)w;
389 if (v1->ptype != v2->ptype)
390 return 0; /* different types of port */
393 * Are the first and second port 1 values the same and the first
394 * and second address 1 values the same?
396 if (v1->port1 == v2->port1 &&
397 ADDRESSES_EQUAL(&v1->addr1, &v2->addr1)) {
399 * Yes. It's the same conversation, and the two
400 * address/port pairs are going in the same direction.
406 * The addresses or the ports don't match.
412 * Initialize some variables every time a file is loaded or re-loaded.
413 * Destroy all existing conversations, and create a new hash table
414 * for the conversations in the new file.
417 conversation_init(void)
419 conversation_key *key;
422 * Free the addresses associated with the conversation keys.
424 for (key = conversation_keys; key != NULL; key = key->next) {
426 * Grr. I guess the theory here is that freeing
427 * something sure as heck modifies it, so you
428 * want to ban attempts to free it, but, alas,
429 * if we make the "data" field of an "address"
430 * structure not a "const", the compiler whines if
431 * we try to make it point into the data for a packet,
432 * as that's a "const" array (and should be, as dissectors
433 * shouldn't trash it).
435 * So we cast the complaint into oblivion, and rely on
436 * the fact that these addresses are known to have had
437 * their data mallocated, i.e. they don't point into,
438 * say, the middle of the data for a packet.
440 g_free((gpointer)key->addr1.data);
441 g_free((gpointer)key->addr2.data);
443 conversation_keys = NULL;
444 if (conversation_hashtable_exact != NULL)
445 g_hash_table_destroy(conversation_hashtable_exact);
446 if (conversation_hashtable_no_addr2 != NULL)
447 g_hash_table_destroy(conversation_hashtable_no_addr2);
448 if (conversation_hashtable_no_port2 != NULL)
449 g_hash_table_destroy(conversation_hashtable_no_port2);
450 if (conversation_hashtable_no_addr2_or_port2 != NULL)
451 g_hash_table_destroy(conversation_hashtable_no_addr2_or_port2);
454 * Free up any space allocated for conversation protocol data
457 * We can free the space, as the structures it contains are
458 * pointed to by conversation data structures that were freed
461 conversation_hashtable_exact =
462 g_hash_table_new(conversation_hash_exact,
463 conversation_match_exact);
464 conversation_hashtable_no_addr2 =
465 g_hash_table_new(conversation_hash_no_addr2,
466 conversation_match_no_addr2);
467 conversation_hashtable_no_port2 =
468 g_hash_table_new(conversation_hash_no_port2,
469 conversation_match_no_port2);
470 conversation_hashtable_no_addr2_or_port2 =
471 g_hash_table_new(conversation_hash_no_addr2_or_port2,
472 conversation_match_no_addr2_or_port2);
475 * Start the conversation indices over at 0.
481 * Given two address/port pairs for a packet, create a new conversation
482 * to contain packets between those address/port pairs.
484 * The options field is used to specify whether the address 2 value
485 * and/or port 2 value are not given and any value is acceptable
486 * when searching for this conversation.
489 conversation_new(guint32 setup_frame, address *addr1, address *addr2, port_type ptype,
490 guint32 port1, guint32 port2, guint options)
493 DISSECTOR_ASSERT(!(options | CONVERSATION_TEMPLATE) || ((options | (NO_ADDR2 | NO_PORT2 | NO_PORT2_FORCE))) &&
494 "A conversation template may not be constructed without wildcard options");
496 GHashTable* hashtable;
497 conversation_t *conversation;
499 conversation_key existing_key;
500 conversation_key *new_key;
502 if (options & NO_ADDR2) {
503 if (options & (NO_PORT2|NO_PORT2_FORCE)) {
504 hashtable = conversation_hashtable_no_addr2_or_port2;
506 hashtable = conversation_hashtable_no_addr2;
509 if (options & (NO_PORT2|NO_PORT2_FORCE)) {
510 hashtable = conversation_hashtable_no_port2;
512 hashtable = conversation_hashtable_exact;
516 existing_key.addr1 = *addr1;
517 existing_key.addr2 = *addr2;
518 existing_key.ptype = ptype;
519 existing_key.port1 = port1;
520 existing_key.port2 = port2;
522 conversation = g_hash_table_lookup(hashtable, &existing_key);
523 tc = conversation; /* Remember if lookup was successful */
525 new_key = se_alloc(sizeof(struct conversation_key));
526 new_key->next = conversation_keys;
527 conversation_keys = new_key;
528 COPY_ADDRESS(&new_key->addr1, addr1);
529 COPY_ADDRESS(&new_key->addr2, addr2);
530 new_key->ptype = ptype;
531 new_key->port1 = port1;
532 new_key->port2 = port2;
535 for (; conversation->next; conversation = conversation->next)
537 conversation->next = se_alloc(sizeof(conversation_t));
538 conversation = conversation->next;
540 conversation = se_alloc(sizeof(conversation_t));
543 conversation->next = NULL;
544 conversation->index = new_index;
545 conversation->setup_frame = setup_frame;
546 conversation->data_list = NULL;
548 /* clear dissector handle */
549 conversation->dissector_handle = NULL;
551 /* set the options and key pointer */
552 conversation->options = options;
553 conversation->key_ptr = new_key;
557 /* only insert a hash table entry if this
558 * is the first conversation with this key */
560 g_hash_table_insert(hashtable, new_key, conversation);
566 * Set the port 2 value in a key. Remove the original from table,
567 * update the options and port values, insert the updated key.
570 conversation_set_port2(conversation_t *conv, guint32 port)
572 DISSECTOR_ASSERT(!(conv->options & CONVERSATION_TEMPLATE) &&
573 "Use the conversation_create_from_template function when the CONVERSATION_TEMPLATE bit is set in the options mask");
576 * If the port 2 value is not wildcarded, don't set it.
578 if ((!(conv->options & NO_PORT2)) || (conv->options & NO_PORT2_FORCE))
581 if (conv->options & NO_ADDR2) {
582 g_hash_table_remove(conversation_hashtable_no_addr2_or_port2,
585 g_hash_table_remove(conversation_hashtable_no_port2,
588 conv->options &= ~NO_PORT2;
589 conv->key_ptr->port2 = port;
590 if (conv->options & NO_ADDR2) {
591 g_hash_table_insert(conversation_hashtable_no_addr2,
592 conv->key_ptr, conv);
594 g_hash_table_insert(conversation_hashtable_exact,
595 conv->key_ptr, conv);
600 * Set the address 2 value in a key. Remove the original from
601 * table, update the options and port values, insert the updated key.
604 conversation_set_addr2(conversation_t *conv, address *addr)
606 DISSECTOR_ASSERT(!(conv->options & CONVERSATION_TEMPLATE) &&
607 "Use the conversation_create_from_template function when the CONVERSATION_TEMPLATE bit is set in the options mask");
610 * If the address 2 value is not wildcarded, don't set it.
612 if (!(conv->options & NO_ADDR2))
615 if (conv->options & NO_PORT2) {
616 g_hash_table_remove(conversation_hashtable_no_addr2_or_port2,
619 g_hash_table_remove(conversation_hashtable_no_addr2,
622 conv->options &= ~NO_ADDR2;
623 COPY_ADDRESS(&conv->key_ptr->addr2, addr);
624 if (conv->options & NO_PORT2) {
625 g_hash_table_insert(conversation_hashtable_no_port2,
626 conv->key_ptr, conv);
628 g_hash_table_insert(conversation_hashtable_exact,
629 conv->key_ptr, conv);
634 * Search a particular hash table for a conversaton with the specified
635 * addr1, port1, addr2, and port2.
637 static conversation_t *
638 conversation_lookup_hashtable(GHashTable *hashtable, guint32 frame_num, address *addr1, address *addr2,
639 port_type ptype, guint32 port1, guint32 port2)
641 conversation_t* conversation;
642 conversation_t* match;
643 conversation_key key;
646 * We don't make a copy of the address data, we just copy the
647 * pointer to it, as "key" disappears when we return.
655 match = g_hash_table_lookup(hashtable, &key);
658 for (conversation = match->next; conversation; conversation = conversation->next) {
659 if ((conversation->setup_frame <= frame_num)
660 && (conversation->setup_frame > match->setup_frame))
661 match = conversation;
670 * Given two address/port pairs for a packet, search for a conversation
671 * containing packets between those address/port pairs. Returns NULL if
674 * We try to find the most exact match that we can, and then proceed to
675 * try wildcard matches on the "addr_b" and/or "port_b" argument if a more
676 * exact match failed.
678 * Either or both of the "addr_b" and "port_b" arguments may be specified as
679 * a wildcard by setting the NO_ADDR_B or NO_PORT_B flags in the "options"
680 * argument. We do only wildcard matches on addresses and ports specified
685 * if neither "addr_b" nor "port_b" were specified as wildcards, we
686 * do an exact match (addr_a/port_a and addr_b/port_b) and, if that
687 * succeeds, we return a pointer to the matched conversation;
689 * otherwise, if "port_b" wasn't specified as a wildcard, we try to
690 * match any address 2 with the specified port 2 (addr_a/port_a and
691 * {any}/addr_b) and, if that succeeds, we return a pointer to the
692 * matched conversation;
694 * otherwise, if "addr_b" wasn't specified as a wildcard, we try to
695 * match any port 2 with the specified address 2 (addr_a/port_a and
696 * addr_b/{any}) and, if that succeeds, we return a pointer to the
697 * matched conversation;
699 * otherwise, we try to match any address 2 and any port 2
700 * (addr_a/port_a and {any}/{any}) and, if that succeeds, we return
701 * a pointer to the matched conversation;
703 * otherwise, we found no matching conversation, and return NULL.
706 find_conversation(guint32 frame_num, address *addr_a, address *addr_b, port_type ptype,
707 guint32 port_a, guint32 port_b, guint options)
709 conversation_t *conversation;
712 * First try an exact match, if we have two addresses and ports.
714 if (!(options & (NO_ADDR_B|NO_PORT_B))) {
716 * Neither search address B nor search port B are wildcarded,
717 * start out with an exact match.
718 * Exact matches check both directions.
721 conversation_lookup_hashtable(conversation_hashtable_exact,
722 frame_num, addr_a, addr_b, ptype,
724 if ((conversation == NULL) && (addr_a->type == AT_FC)) {
725 /* In Fibre channel, OXID & RXID are never swapped as
726 * TCP/UDP ports are in TCP/IP.
729 conversation_lookup_hashtable(conversation_hashtable_exact,
730 frame_num, addr_b, addr_a, ptype,
733 if (conversation != NULL)
738 * Well, that didn't find anything. Try matches that wildcard
739 * one of the addresses, if we have two ports.
741 if (!(options & NO_PORT_B)) {
743 * Search port B isn't wildcarded.
745 * First try looking for a conversation with the specified
746 * address A and port A as the first address and port, and
747 * with any address and the specified port B as the second
749 * ("addr_b" doesn't take part in this lookup.)
752 conversation_lookup_hashtable(conversation_hashtable_no_addr2,
753 frame_num, addr_a, addr_b, ptype, port_a, port_b);
754 if ((conversation == NULL) && (addr_a->type == AT_FC)) {
755 /* In Fibre channel, OXID & RXID are never swapped as
756 * TCP/UDP ports are in TCP/IP.
759 conversation_lookup_hashtable(conversation_hashtable_no_addr2,
760 frame_num, addr_b, addr_a, ptype,
763 if (conversation != NULL) {
765 * If search address B isn't wildcarded, and this is for a
766 * connection-oriented protocol, set the second address for this
767 * conversation to address B, as that's the address that matched the
768 * wildcarded second address for this conversation.
770 * (This assumes that, for all connection oriented protocols, the
771 * endpoints of a connection have only one address each, i.e. you
772 * don't get packets in a given direction coming from more than one
773 * address, unless the CONVERSATION_TEMPLATE option is set.)
775 if (!(conversation->options & NO_ADDR_B) && ptype != PT_UDP)
777 if(!(conversation->options & CONVERSATION_TEMPLATE))
779 conversation_set_addr2(conversation, addr_b);
784 conversation_create_from_template(conversation, addr_b, 0);
791 * Well, that didn't find anything.
792 * If search address B was specified, try looking for a
793 * conversation with the specified address B and port B as
794 * the first address and port, and with any address and the
795 * specified port A as the second address and port (this
796 * packet may be going in the opposite direction from the
797 * first packet in the conversation).
798 * ("addr_a" doesn't take part in this lookup.)
800 if (!(options & NO_ADDR_B)) {
802 conversation_lookup_hashtable(conversation_hashtable_no_addr2,
803 frame_num, addr_b, addr_a, ptype, port_b, port_a);
804 if (conversation != NULL) {
806 * If this is for a connection-oriented
807 * protocol, set the second address for
808 * this conversation to address A, as
809 * that's the address that matched the
810 * wildcarded second address for this
813 if (ptype != PT_UDP) {
814 if(!(conversation->options & CONVERSATION_TEMPLATE))
816 conversation_set_addr2(conversation, addr_a);
821 conversation_create_from_template(conversation, addr_a, 0);
830 * Well, that didn't find anything. Try matches that wildcard
831 * one of the ports, if we have two addresses.
833 if (!(options & NO_ADDR_B)) {
835 * Search address B isn't wildcarded.
837 * First try looking for a conversation with the specified
838 * address A and port A as the first address and port, and
839 * with the specified address B and any port as the second
841 * ("port_b" doesn't take part in this lookup.)
844 conversation_lookup_hashtable(conversation_hashtable_no_port2,
845 frame_num, addr_a, addr_b, ptype, port_a, port_b);
846 if ((conversation == NULL) && (addr_a->type == AT_FC)) {
847 /* In Fibre channel, OXID & RXID are never swapped as
848 * TCP/UDP ports are in TCP/IP
851 conversation_lookup_hashtable(conversation_hashtable_no_port2,
852 frame_num, addr_b, addr_a, ptype, port_a, port_b);
854 if (conversation != NULL) {
856 * If search port B isn't wildcarded, and this is for a connection-
857 * oriented protocol, set the second port for this conversation to
858 * port B, as that's the port that matched the wildcarded second port
859 * for this conversation.
861 * (This assumes that, for all connection oriented protocols, the
862 * endpoints of a connection have only one port each, i.e. you don't
863 * get packets in a given direction coming from more than one port,
864 * unless the CONVERSATION_TEMPLATE option is set.)
866 if (!(conversation->options & NO_PORT_B) && ptype != PT_UDP)
868 if(!(conversation->options & CONVERSATION_TEMPLATE))
870 conversation_set_port2(conversation, port_b);
875 conversation_create_from_template(conversation, 0, port_b);
882 * Well, that didn't find anything.
883 * If search port B was specified, try looking for a
884 * conversation with the specified address B and port B
885 * as the first address and port, and with the specified
886 * address A and any port as the second address and port
887 * (this packet may be going in the opposite direction
888 * from the first packet in the conversation).
889 * ("port_a" doesn't take part in this lookup.)
891 if (!(options & NO_PORT_B)) {
893 conversation_lookup_hashtable(conversation_hashtable_no_port2,
894 frame_num, addr_b, addr_a, ptype, port_b, port_a);
895 if (conversation != NULL) {
897 * If this is for a connection-oriented
898 * protocol, set the second port for
899 * this conversation to port A, as
900 * that's the address that matched the
901 * wildcarded second address for this
906 if(!(conversation->options & CONVERSATION_TEMPLATE))
908 conversation_set_port2(conversation, port_a);
913 conversation_create_from_template(conversation, 0, port_a);
922 * Well, that didn't find anything. Try matches that wildcard
923 * one address/port pair.
925 * First try looking for a conversation with the specified address A
926 * and port A as the first address and port.
927 * (Neither "addr_b" nor "port_b" take part in this lookup.)
930 conversation_lookup_hashtable(conversation_hashtable_no_addr2_or_port2,
931 frame_num, addr_a, addr_b, ptype, port_a, port_b);
932 if (conversation != NULL) {
934 * If this is for a connection-oriented protocol:
936 * if search address B isn't wildcarded, set the
937 * second address for this conversation to address
938 * B, as that's the address that matched the
939 * wildcarded second address for this conversation;
941 * if search port B isn't wildcarded, set the
942 * second port for this conversation to port B,
943 * as that's the port that matched the wildcarded
944 * second port for this conversation.
948 if(!(conversation->options & CONVERSATION_TEMPLATE))
950 if (!(conversation->options & NO_ADDR_B))
951 conversation_set_addr2(conversation, addr_b);
952 if (!(conversation->options & NO_PORT_B))
953 conversation_set_port2(conversation, port_b);
958 conversation_create_from_template(conversation, addr_b, port_b);
965 * Well, that didn't find anything.
966 * If search address and port B were specified, try looking for a
967 * conversation with the specified address B and port B as the
968 * first address and port, and with any second address and port
969 * (this packet may be going in the opposite direction from the
970 * first packet in the conversation).
971 * (Neither "addr_a" nor "port_a" take part in this lookup.)
973 if (addr_a->type == AT_FC)
975 conversation_lookup_hashtable(conversation_hashtable_no_addr2_or_port2,
976 frame_num, addr_b, addr_a, ptype, port_a, port_b);
979 conversation_lookup_hashtable(conversation_hashtable_no_addr2_or_port2,
980 frame_num, addr_b, addr_a, ptype, port_b, port_a);
981 if (conversation != NULL) {
983 * If this is for a connection-oriented protocol, set the
984 * second address for this conversation to address A, as
985 * that's the address that matched the wildcarded second
986 * address for this conversation, and set the second port
987 * for this conversation to port A, as that's the port
988 * that matched the wildcarded second port for this
993 if(!(conversation->options & CONVERSATION_TEMPLATE))
995 conversation_set_addr2(conversation, addr_a);
996 conversation_set_port2(conversation, port_a);
1000 conversation = conversation_create_from_template(conversation, addr_a, port_a);
1003 return conversation;
1007 * We found no conversation.
1013 p_compare(gconstpointer a, gconstpointer b)
1015 const conv_proto_data *ap = (const conv_proto_data *)a;
1016 const conv_proto_data *bp = (const conv_proto_data *)b;
1018 if (ap->proto > bp->proto)
1020 else if (ap->proto == bp->proto)
1027 conversation_add_proto_data(conversation_t *conv, int proto, void *proto_data)
1029 conv_proto_data *p1 = se_alloc(sizeof(conv_proto_data));
1032 p1->proto_data = proto_data;
1034 /* Add it to the list of items for this conversation. */
1036 conv->data_list = g_slist_insert_sorted(conv->data_list, (gpointer *)p1,
1041 conversation_get_proto_data(conversation_t *conv, int proto)
1043 conv_proto_data temp, *p1;
1047 temp.proto_data = NULL;
1049 item = g_slist_find_custom(conv->data_list, (gpointer *)&temp,
1053 p1 = (conv_proto_data *)item->data;
1054 return p1->proto_data;
1061 conversation_delete_proto_data(conversation_t *conv, int proto)
1063 conv_proto_data temp;
1067 temp.proto_data = NULL;
1069 item = g_slist_find_custom(conv->data_list, (gpointer *)&temp,
1073 conv->data_list = g_slist_remove(conv->data_list, item->data);
1079 conversation_set_dissector(conversation_t *conversation, dissector_handle_t handle)
1081 conversation->dissector_handle = handle;
1085 * Given two address/port pairs for a packet, search for a matching
1086 * conversation and, if found and it has a conversation dissector,
1087 * call that dissector and return TRUE, otherwise return FALSE.
1089 * This helper uses call_dissector_only which will NOT call the default
1090 * "data" dissector if the packet was rejected.
1091 * Our caller is responsible to call the data dissector explicitely in case
1092 * this function returns FALSE.
1095 try_conversation_dissector(address *addr_a, address *addr_b, port_type ptype,
1096 guint32 port_a, guint32 port_b, tvbuff_t *tvb, packet_info *pinfo,
1099 conversation_t *conversation;
1101 conversation = find_conversation(pinfo->fd->num, addr_a, addr_b, ptype, port_a,
1104 if (conversation != NULL) {
1106 if (conversation->dissector_handle == NULL)
1108 ret=call_dissector_only(conversation->dissector_handle, tvb, pinfo,
1111 /* this packet was rejected by the dissector
1112 * so return FALSE in case our caller wants
1113 * to do some cleaning up.