ice: Increase foundation buffer size

Per RFC 5245, the foundation specified with an ICE candidate can be up
to 32 characters but we are only allowing for 31.

ASTERISK-27498 #close
Reported by: Michele Prà

Change-Id: I05ce7a5952721a76a2b4c90366168022558dc7cf

channels/chan_sip.c

@@ -11343,7 +11343,7 @@ static int process_sdp_a_ice(const char *a, struct sip_pvt *p, struct ast_rtp_in
 {
 	struct ast_rtp_engine_ice *ice;
 	int found = FALSE;
-	char ufrag[256], pwd[256], foundation[32], transport[4], address[46], cand_type[6], relay_address[46] = "";
+	char ufrag[256], pwd[256], foundation[33], transport[4], address[46], cand_type[6], relay_address[46] = "";
 	struct ast_rtp_engine_ice_candidate candidate = { 0, };
 	unsigned int port, relay_port = 0;
 
@@ -11357,7 +11357,7 @@ static int process_sdp_a_ice(const char *a, struct sip_pvt *p, struct ast_rtp_in
 	} else if (sscanf(a, "ice-pwd: %255s", pwd) == 1) {
 		ice->set_authentication(instance, NULL, pwd);
 		found = TRUE;
-	} else if (sscanf(a, "candidate: %31s %30u %3s %30u %23s %30u typ %5s %*s %23s %*s %30u", foundation, &candidate.id, transport, (unsigned *)&candidate.priority,
+	} else if (sscanf(a, "candidate: %32s %30u %3s %30u %23s %30u typ %5s %*s %23s %*s %30u", foundation, &candidate.id, transport, (unsigned *)&candidate.priority,
 			  address, &port, cand_type, relay_address, &relay_port) >= 7) {
 
 		if (rtcp_mux_offered && ast_test_flag(&p->flags[2], SIP_PAGE3_RTCP_MUX) && candidate.id > 1) {

main/sdp_state.c

@@ -2171,7 +2171,7 @@ static void update_ice(const struct ast_sdp_state *state, struct ast_rtp_instanc
 
 	/* Find all of the candidates */
 	for (attr_i = 0; attr_i < ast_sdp_m_get_a_count(remote_m_line); ++attr_i) {
-		char foundation[32];
+		char foundation[33];
 		char transport[32];
 		char address[INET6_ADDRSTRLEN + 1];
 		char cand_type[6];
@@ -2187,7 +2187,7 @@ static void update_ice(const struct ast_sdp_state *state, struct ast_rtp_instanc
 			continue;
 		}
 
-		if (sscanf(attr->value, "%31s %30u %31s %30u %46s %30u typ %5s %*s %23s %*s %30u",
+		if (sscanf(attr->value, "%32s %30u %31s %30u %46s %30u typ %5s %*s %23s %*s %30u",
 			foundation, &candidate.id, transport, (unsigned *)&candidate.priority, address,
 			&port, cand_type, relay_address, &relay_port) < 7) {
 			/* Candidate did not parse properly */

res/res_pjsip_sdp_rtp.c

@@ -627,7 +627,7 @@ static void process_ice_attributes(struct ast_sip_session *session, struct ast_s
 
 	/* Find all of the candidates */
 	for (attr_i = 0; attr_i < remote_stream->attr_count; ++attr_i) {
-		char foundation[32], transport[32], address[PJ_INET6_ADDRSTRLEN + 1], cand_type[6], relay_address[PJ_INET6_ADDRSTRLEN + 1] = "";
+		char foundation[33], transport[32], address[PJ_INET6_ADDRSTRLEN + 1], cand_type[6], relay_address[PJ_INET6_ADDRSTRLEN + 1] = "";
 		unsigned int port, relay_port = 0;
 		struct ast_rtp_engine_ice_candidate candidate = { 0, };
 
@@ -640,7 +640,7 @@ static void process_ice_attributes(struct ast_sip_session *session, struct ast_s
 
 		ast_copy_pj_str(attr_value, (pj_str_t*)&attr->value, sizeof(attr_value));
 
-		if (sscanf(attr_value, "%31s %30u %31s %30u %46s %30u typ %5s %*s %23s %*s %30u", foundation, &candidate.id, transport,
+		if (sscanf(attr_value, "%32s %30u %31s %30u %46s %30u typ %5s %*s %23s %*s %30u", foundation, &candidate.id, transport,
 			(unsigned *)&candidate.priority, address, &port, cand_type, relay_address, &relay_port) < 7) {
 			/* Candidate did not parse properly */
 			continue;