Merged revisions 215681 via svnmerge from

https://origsvn.digium.com/svn/asterisk/trunk

........
  r215681 | dvossel | 2009-09-02 16:39:31 -0500 (Wed, 02 Sep 2009) | 10 lines
  
  port string to int conversion using sscanf
  
  There are several instances where a port is parsed
  from a uri or some other source and converted to
  an int value using atoi(), if for some reason the
  port string is empty, then a standard port is used.
  This logic is used over and over, so I created a function
  to handle it in a safer way using sscanf().
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.0@215687 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -2451,6 +2451,20 @@ static int proxy_update(struct sip_proxy *proxy)
 	return TRUE;
 }
 
+/*! \brief converts ascii port to int representation. If no
+ *  pt buffer is provided or the pt has errors when being converted
+ *  to an int value, the port provided as the standard is used.
+ */
+static int port_str2int(const char *pt, unsigned int standard)
+{
+	int port = standard;
+	if (ast_strlen_zero(pt) || (sscanf(pt, "%30d", &port) != 1) || (port < 0)) {
+		port = standard;
+	}
+
+	return port;
+}
+
 /*! \brief Allocate and initialize sip proxy */
 static struct sip_proxy *proxy_allocate(char *name, char *port, int force)
 {
@@ -2465,7 +2479,7 @@ static struct sip_proxy *proxy_allocate(char *name, char *port, int force)
 		return NULL;
 	proxy->force = force;
 	ast_copy_string(proxy->name, name, sizeof(proxy->name));
-	proxy->ip.sin_port = htons((!ast_strlen_zero(port) ? atoi(port) : STANDARD_SIP_PORT));
+	proxy->ip.sin_port = htons(port_str2int(port, STANDARD_SIP_PORT));
 	proxy_update(proxy);
 	return proxy;
 }
@@ -4366,7 +4380,7 @@ static int create_addr(struct sip_pvt *dialog, const char *opeer, int newdialog)
 		}
 	}
 	if (!portno)
-		portno = port ? atoi(port) : (dialog->socket.type & SIP_TRANSPORT_TLS) ? STANDARD_TLS_PORT : STANDARD_SIP_PORT;
+		portno = port_str2int(port, (dialog->socket.type == SIP_TRANSPORT_TLS) ? STANDARD_TLS_PORT : STANDARD_SIP_PORT);
 	hp = ast_gethostbyname(hostn, &ahp);
 	if (!hp) {
 		ast_log(LOG_WARNING, "No such host: %s\n", peername);
@@ -10348,17 +10362,17 @@ static int __set_address_from_contact(const char *fullcontact, struct sockaddr_i
 	 * We still need to be able to send to the remote agent through the proxy.
 	*/
 
-	if (!parse_uri(contact, "sip,sips", &contact, NULL, &host, &pt, NULL, &transport)) {
-		if (((get_transport_str2enum(transport) == SIP_TRANSPORT_TLS)) ||
-			!(strncasecmp(fullcontact, "sips", 4))) {
-			port = !ast_strlen_zero(pt) ? atoi(pt) : STANDARD_TLS_PORT;
-		} else {
-			port = !ast_strlen_zero(pt) ? atoi(pt) : STANDARD_SIP_PORT;
-		}
-	} else {
+	if (parse_uri(contact, "sip,sips", &contact, NULL, &host, &pt, NULL, &transport)) {
 		ast_log(LOG_WARNING, "Invalid contact uri %s (missing sip: or sips:), attempting to use anyway\n", fullcontact);
 	}
 
+	/* set port */
+	if (((get_transport_str2enum(transport) == SIP_TRANSPORT_TLS)) || !(strncasecmp(fullcontact, "sips", 4))) {
+		port = port_str2int(pt, STANDARD_TLS_PORT);
+	} else {
+		port = port_str2int(pt, STANDARD_SIP_PORT);
+	}
+
 	/* XXX This could block for a long time XXX */
 	/* We should only do this if it's a name, not an IP */
 	hp = ast_gethostbyname(host, &ahp);
@@ -10469,13 +10483,10 @@ static enum parse_register_result parse_register_contact(struct sip_pvt *pvt, st
 		/* if the port is not specified but the transport is, make sure to set the
 		 * default port to match the specified transport.  This may or may not be the
 		 * same transport used by the pvt struct for the Register dialog. */
-		if (ast_strlen_zero(pt)) {
-			port = (transport_type == SIP_TRANSPORT_TLS) ? STANDARD_TLS_PORT : STANDARD_SIP_PORT;
-		} else {
-			port = atoi(pt);
-		}
+		
+		port = port_str2int(pt, (transport_type == SIP_TRANSPORT_TLS) ? STANDARD_TLS_PORT : STANDARD_SIP_PORT);
 	} else {
-		port = !ast_strlen_zero(pt) ? atoi(pt) : STANDARD_SIP_PORT;
+		port = port_str2int(pt, STANDARD_SIP_PORT);
 		transport_type = pvt->socket.type;
 	}
 
@@ -11885,7 +11896,7 @@ static void check_via(struct sip_pvt *p, struct sip_request *req)
 		memset(&p->sa, 0, sizeof(p->sa));
 		p->sa.sin_family = AF_INET;
 		memcpy(&p->sa.sin_addr, hp->h_addr, sizeof(p->sa.sin_addr));
-		p->sa.sin_port = htons(pt ? atoi(pt) : STANDARD_SIP_PORT);
+		p->sa.sin_port = htons(port_str2int(pt, STANDARD_SIP_PORT));
 
 		if (sip_debug_test_pvt(p)) {
 			const struct sockaddr_in *dst = sip_real_dst(p);