Changeset 721 for pjproject/trunk/pjlib/src/pj/addr_resolv_sock.c

Timestamp:

Sep 14, 2006 6:51:01 PM (18 years ago)

Author:

bennylp

Message:

Fix the local IP address resolution issue in PJSIP, PJMEDIA, and PJSUA, by adding a new API pj_gethostip() to resolve the default local IP address of local host. This new function will work even when local hostname resolution is not set correctly, by detecting the default IP interface in the system.

Also fix compile warnings in iLBC.

File:

• pjproject/trunk/pjlib/src/pj/addr_resolv_sock.c (modified) (2 diffs)

pjproject/trunk/pjlib/src/pj/addr_resolv_sock.c

@@ -20 +20 @@
 #include <pj/assert.h>
 #include <pj/string.h>
+#include <pj/errno.h>
 #include <pj/compat/socket.h>
-#include <pj/errno.h>
 
 
@@ -50 +50 @@
 }
 
+/* Resolve the IP address of local machine */
+pj_status_t pj_gethostip(pj_in_addr *addr)
+{
+    const pj_str_t *hostname = pj_gethostname();
+    struct pj_hostent he;
+    pj_str_t cp;
+    pj_in_addr loopip;
+    pj_status_t status;
+
+    cp = pj_str("127.0.0.1");
+    loopip = pj_inet_addr(&cp);
+
+    /* Try with resolving local hostname first */
+    status = pj_gethostbyname(hostname, &he);
+    if (status == PJ_SUCCESS) {
+        *addr = *(pj_in_addr*)he.h_addr;
+    }
+
+
+    /* If we end up with 127.0.0.1, resolve the IP by getting the default
+     * interface to connect to some public host.
+     */
+    if (status != PJ_SUCCESS || addr->s_addr == loopip.s_addr) {
+        pj_sock_t fd;
+        pj_sockaddr_in a;
+        int len;
+
+        status = pj_sock_socket(PJ_AF_INET, PJ_SOCK_DGRAM, 0, &fd);
+        if (status != PJ_SUCCESS) {
+            return status;
+        }
+
+        cp = pj_str("1.1.1.1");
+        pj_sockaddr_in_init(&a, &cp, 53);
+
+        status = pj_sock_connect(fd, &a, sizeof(a));
+        if (status != PJ_SUCCESS) {
+            pj_sock_close(fd);
+            return status;
+        }
+
+        len = sizeof(a);
+        status = pj_sock_getsockname(fd, &a, &len);
+        if (status != PJ_SUCCESS) {
+            pj_sock_close(fd);
+            return status;
+        }
+
+        pj_sock_close(fd);
+
+        *addr = a.sin_addr;
+    }
+
+    return status;
+}
+
+