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-rw-r--r--channels/chan_sip.c124
1 files changed, 106 insertions, 18 deletions
diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index a94bdf9a8..a816b57a1 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -1447,7 +1447,7 @@ static int copy_via_headers(struct sip_pvt *p, struct sip_request *req, const st
static void set_destination(struct sip_pvt *p, const char *uri);
static void add_date(struct sip_request *req);
static void add_expires(struct sip_request *req, int expires);
-static void build_contact(struct sip_pvt *p);
+static void build_contact(struct sip_pvt *p, struct sip_request *req, int incoming);
/*------Request handling functions */
static int handle_incoming(struct sip_pvt *p, struct sip_request *req, struct ast_sockaddr *addr, int *recount, int *nounlock);
@@ -13847,22 +13847,110 @@ static void extract_uri(struct sip_pvt *p, struct sip_request *req)
if (!ast_strlen_zero(c)) {
ast_string_field_set(p, uri, c);
}
+}
+
+/*!
+ * \brief Determine if, as a UAS, we need to use a SIPS Contact.
+ *
+ * This uses the rules defined in RFC 3261 section 12.1.1 to
+ * determine if a SIPS URI should be used as the Contact header
+ * when responding to incoming SIP requests.
+ *
+ * \param req The incoming SIP request
+ * \retval 0 SIPS is not required
+ * \retval 1 SIPS is required
+ */
+static int uas_sips_contact(struct sip_request *req)
+{
+ const char *record_route = sip_get_header(req, "Record-Route");
+
+ if (!strncmp(REQ_OFFSET_TO_STR(req, rlpart2), "sips:", 5)) {
+ return 1;
+ }
+
+ if (record_route) {
+ char *record_route_uri = get_in_brackets(ast_strdupa(record_route));
+
+ if (!strncmp(record_route_uri, "sips:", 5)) {
+ return 1;
+ }
+ } else {
+ const char *contact = sip_get_header(req, "Contact");
+ char *contact_uri = get_in_brackets(ast_strdupa(contact));
+
+ if (!strncmp(contact_uri, "sips:", 5)) {
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+/*!
+ * \brief Determine if, as a UAC, we need to use a SIPS Contact.
+ *
+ * This uses the rules defined in RFC 3621 section 8.1.1.8 to
+ * determine if a SIPS URI should be used as the Contact header
+ * on our outgoing request.
+ *
+ * \param req The outgoing SIP request
+ * \retval 0 SIPS is not required
+ * \retval 1 SIPS is required
+ */
+static int uac_sips_contact(struct sip_request *req)
+{
+ const char *route = sip_get_header(req, "Route");
+
+ if (!strncmp(REQ_OFFSET_TO_STR(req, rlpart2), "sips:", 5)) {
+ return 1;
+ }
+
+ if (route) {
+ char *route_uri = get_in_brackets(ast_strdupa(route));
+ if (!strncmp(route_uri, "sips:", 5)) {
+ return 1;
+ }
+ }
+
+ return 0;
}
-/*! \brief Build contact header - the contact header we send out */
-static void build_contact(struct sip_pvt *p)
+/*!
+ * \brief Build contact header
+ *
+ * This is the Contact header that we send out in SIP requests and responses
+ * involving this sip_pvt.
+ *
+ * The incoming parameter is used to tell if we are building the request parameter
+ * is an incoming SIP request that we are building the Contact header in response to,
+ * or if the req parameter is an outbound SIP request that we will later be adding
+ * the Contact header to.
+ *
+ * \param p The sip_pvt where the built Contact will be saved.
+ * \param req The request that triggered the creation of a Contact header.
+ * \param incoming Indicates if the Contact header is being created for a response to an incoming request
+ */
+static void build_contact(struct sip_pvt *p, struct sip_request *req, int incoming)
{
char tmp[SIPBUFSIZE];
char *user = ast_uri_encode(p->exten, tmp, sizeof(tmp), ast_uri_sip_user);
+ int use_sips;
+
+ if (incoming) {
+ use_sips = uas_sips_contact(req);
+ } else {
+ use_sips = uac_sips_contact(req);
+ }
if (p->socket.type == AST_TRANSPORT_UDP) {
- ast_string_field_build(p, our_contact, "<sip:%s%s%s>", user,
- ast_strlen_zero(user) ? "" : "@", ast_sockaddr_stringify_remote(&p->ourip));
+ ast_string_field_build(p, our_contact, "<%s:%s%s%s>", use_sips ? "sips" : "sip",
+ user, ast_strlen_zero(user) ? "" : "@",
+ ast_sockaddr_stringify_remote(&p->ourip));
} else {
- ast_string_field_build(p, our_contact, "<sip:%s%s%s;transport=%s>", user,
- ast_strlen_zero(user) ? "" : "@", ast_sockaddr_stringify_remote(&p->ourip),
- sip_get_transport(p->socket.type));
+ ast_string_field_build(p, our_contact, "<%s:%s%s%s;transport=%s>",
+ use_sips ? "sips" : "sip", user, ast_strlen_zero(user) ? "" : "@",
+ ast_sockaddr_stringify_remote(&p->ourip), sip_get_transport(p->socket.type));
}
}
@@ -14058,7 +14146,7 @@ static void initreqprep(struct sip_request *req, struct sip_pvt *p, int sipmetho
add_header(req, "From", from);
add_header(req, "To", to);
ast_string_field_set(p, exten, l);
- build_contact(p);
+ build_contact(p, req, 0);
add_header(req, "Contact", p->our_contact);
add_header(req, "Call-ID", p->callid);
add_header(req, "CSeq", tmp_n);
@@ -14487,7 +14575,6 @@ static int __sip_subscribe_mwi_do(struct sip_subscription_mwi *mwi)
set_socket_transport(&mwi->call->socket, mwi->transport);
mwi->call->socket.port = htons(mwi->portno);
ast_sip_ouraddrfor(&mwi->call->sa, &mwi->call->ourip, mwi->call);
- build_contact(mwi->call);
build_via(mwi->call);
/* Change the dialog callid. */
@@ -15455,7 +15542,6 @@ static int transmit_register(struct sip_registry *r, int sipmethod, const char *
internal network so we can register through nat
*/
ast_sip_ouraddrfor(&p->sa, &p->ourip, p);
- build_contact(p);
}
/* set up a timeout */
@@ -15535,6 +15621,7 @@ static int transmit_register(struct sip_registry *r, int sipmethod, const char *
}
add_expires(&req, r->expiry);
+ build_contact(p, &req, 0);
add_header(&req, "Contact", p->our_contact);
initialize_initreq(p, &req);
@@ -17064,7 +17151,7 @@ static enum check_auth_result register_verify(struct sip_pvt *p, struct ast_sock
}
ast_string_field_set(p, exten, name);
- build_contact(p);
+ build_contact(p, req, 1);
if (req->ignore) {
/* Expires is a special case, where we only want to load the peer if this isn't a deregistration attempt */
const char *expires = sip_get_header(req, "Expires");
@@ -18610,8 +18697,9 @@ static enum check_auth_result check_user_full(struct sip_pvt *p, struct sip_requ
if (t)
*t = '\0';
- if (ast_strlen_zero(p->our_contact))
- build_contact(p);
+ if (ast_strlen_zero(p->our_contact)) {
+ build_contact(p, req, 1);
+ }
}
of = get_in_brackets(of);
@@ -24760,7 +24848,7 @@ static int handle_request_options(struct sip_pvt *p, struct sip_request *req, st
/* must go through authentication before getting here */
gotdest = get_destination(p, req, NULL);
- build_contact(p);
+ build_contact(p, req, 1);
if (ast_strlen_zero(p->context))
ast_string_field_set(p, context, sip_cfg.default_context);
@@ -25526,8 +25614,8 @@ static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, str
goto request_invite_cleanup;
}
gotdest = get_destination(p, NULL, &cc_recall_core_id); /* Get destination right away */
- extract_uri(p, req); /* Get the Contact URI */
- build_contact(p); /* Build our contact header */
+ extract_uri(p, req); /* Get the Contact URI */
+ build_contact(p, req, 1); /* Build our contact header */
if (p->rtp) {
ast_rtp_instance_set_prop(p->rtp, AST_RTP_PROPERTY_DTMF, ast_test_flag(&p->flags[0], SIP_DTMF) == SIP_DTMF_RFC2833);
@@ -27435,7 +27523,7 @@ static int handle_request_subscribe(struct sip_pvt *p, struct sip_request *req,
/* Get full contact header - this needs to be used as a request URI in NOTIFY's */
parse_ok_contact(p, req);
- build_contact(p);
+ build_contact(p, req, 1);
/* Initialize tag for new subscriptions */
if (ast_strlen_zero(p->tag)) {
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-01 16:51:17 +0000