Make the sip_standard_port function more granular by allowing separate

type and port arguments. This is necessary because when building our From
and Contact headers, we need to be absolutely sure that we are placing our
source port there and not the peer's source port.

(closes issue #12761)
Reported by: asbestoshead
Patches:
      patch-chan-sip-contact-port.txt uploaded by asbestoshead (license 455)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@151464 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 21 insertions, 12 deletions

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 33f5dad15..613977726 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -1952,7 +1952,7 @@ static int sip_queryoption(struct ast_channel *chan, int option, void *data, int
 static const char *sip_get_callid(struct ast_channel *chan);
 
 static int handle_request_do(struct sip_request *req, struct sockaddr_in *sin);
-static int sip_standard_port(struct sip_socket s);
+static int sip_standard_port(enum sip_transport type, int port);
 static int sip_prepare_socket(struct sip_pvt *p);
 static int sip_parse_host(char *line, int lineno, char **hostname, int *portnum, enum sip_transport *transport);
 
@@ -9211,15 +9211,17 @@ static void extract_uri(struct sip_pvt *p, struct sip_request *req)
 /*! \brief Build contact header - the contact header we send out */
 static void build_contact(struct sip_pvt *p)
 {
-	/* Construct Contact: header */
+
+	int ourport = ntohs(p->ourip.sin_port);
+
 	if (p->socket.type & SIP_TRANSPORT_UDP) {
-		if (!sip_standard_port(p->socket))
-			ast_string_field_build(p, our_contact, "<sip:%s%s%s:%d>", p->exten, ast_strlen_zero(p->exten) ? "" : "@", ast_inet_ntoa(p->ourip.sin_addr), ntohs(p->socket.port));
+		if (!sip_standard_port(p->socket.type, ourport))
+			ast_string_field_build(p, our_contact, "<sip:%s%s%s:%d>", p->exten, ast_strlen_zero(p->exten) ? "" : "@", ast_inet_ntoa(p->ourip.sin_addr), ourport);
 		else
 			ast_string_field_build(p, our_contact, "<sip:%s%s%s>", p->exten, ast_strlen_zero(p->exten) ? "" : "@", ast_inet_ntoa(p->ourip.sin_addr));
 	} else  {
 		/*! \todo We should not always add port here. Port is only added if it's non-standard (see code above) */
-		ast_string_field_build(p, our_contact, "<sip:%s%s%s:%d;transport=%s>", p->exten, ast_strlen_zero(p->exten) ? "" : "@", ast_inet_ntoa(p->ourip.sin_addr), ntohs(p->socket.port), get_transport_pvt(p));
+		ast_string_field_build(p, our_contact, "<sip:%s%s%s:%d;transport=%s>", p->exten, ast_strlen_zero(p->exten) ? "" : "@", ast_inet_ntoa(p->ourip.sin_addr), ourport, get_transport(p->socket.type));
 	}
 }
 
@@ -9313,6 +9315,7 @@ static void initreqprep(struct sip_request *req, struct sip_pvt *p, int sipmetho
 	const char *l = NULL;	/* XXX what is this, exactly ? */
 	const char *n = NULL;	/* XXX what is this, exactly ? */
 	const char *urioptions = "";
+	int ourport;
 
 	if (ast_test_flag(&p->flags[0], SIP_USEREQPHONE)) {
 	 	const char *s = p->username;	/* being a string field, cannot be NULL */
@@ -9369,8 +9372,9 @@ static void initreqprep(struct sip_request *req, struct sip_pvt *p, int sipmetho
 		l = tmp_l;
 	}
 
-	if (!sip_standard_port(p->socket) && ast_strlen_zero(p->fromdomain))
-		snprintf(from, sizeof(from), "\"%s\" <sip:%s@%s:%d>;tag=%s", n, l, S_OR(p->fromdomain, ast_inet_ntoa(p->ourip.sin_addr)), ntohs(p->socket.port), p->tag);
+	ourport = ntohs(p->ourip.sin_port);
+	if (!sip_standard_port(p->socket.type, ourport) && ast_strlen_zero(p->fromdomain))
+		snprintf(from, sizeof(from), "\"%s\" <sip:%s@%s:%d>;tag=%s", n, l, ast_inet_ntoa(p->ourip.sin_addr), ourport, p->tag);
 	else
 		snprintf(from, sizeof(from), "\"%s\" <sip:%s@%s>;tag=%s", n, l, S_OR(p->fromdomain, ast_inet_ntoa(p->ourip.sin_addr)), p->tag);
 
@@ -20044,13 +20048,18 @@ static int handle_request_do(struct sip_request *req, struct sockaddr_in *sin)
 	return 1;
 }
 
-/*! \brief Returns the port to use for this socket */
-static int sip_standard_port(struct sip_socket s) 
+/*! \brief Returns the port to use for this socket
+ *
+ * \param type The type of transport used
+ * \param port Port we are checking to see if it's the standard port.
+ * \note port is expected in host byte order
+ */
+static int sip_standard_port(enum sip_transport type, int port)
 {
-	if (s.type & SIP_TRANSPORT_TLS)
-		return s.port == htons(STANDARD_TLS_PORT);
+	if (type & SIP_TRANSPORT_TLS)
+		return port == STANDARD_TLS_PORT;
 	else
-		return s.port == htons(STANDARD_SIP_PORT);
+		return port == STANDARD_SIP_PORT;
 }
 
 /*! \todo Find thread for TCP/TLS session (based on IP/Port */