cosmetics and some better error handling w/ strings and data structures

(NULL ptrs)

src/accessctl.c

@@ -102,7 +102,7 @@ int accesslist_check (struct sockaddr_in from) {
 
 
 /*
- * checks for a match of the 'from' address with the supplies
+ * checks for a match of the 'from' address with the supplied
  * access list.
  *
  * RETURNS

src/auth.c

@@ -80,7 +80,7 @@ int authenticate_proxy(sip_t *request) {
    }
 
    /* authentication failed */
-   DEBUGC(DBCLASS_AUTH,"proxy-auth failed");
+   WARN("authenticate_proxy failed");
    return STS_FAILURE;
 }
 

src/proxy.c

@@ -185,23 +185,24 @@ int proxy_request (sip_t *request) {
       /* add my Via header line (outbound interface)*/
       sts = proxy_add_myvia(request, 0);
       if (sts == STS_FAILURE) {
-         WARN("adding my outbound via failed!");
+         ERROR("adding my outbound via failed!");
       }
 
       /* if this is CANCEL/BYE request, stop RTP proxying */
       if (MSG_IS_BYE(request) || MSG_IS_CANCEL(request)) {
-         /* stop the RTP proxying stream */
          rtp_stop_fwd(msg_getcall_id(request));
       }
 
       break;
    
    default:
-      DEBUGC(DBCLASS_PROXY,"request: refuse to proxy - UA not registered?");
+      DEBUGC(DBCLASS_PROXY,"proxy_request: refused to proxy");
       WARN("request from/to unregistered UA (%s@%s)",
 	        request->from->url->username,
 		request->from->url->host);
-/* some clients seem to run amok when passing back a negative response */
+/* some clients seem to run amok when passing back a negative response
+ * so we simply drop the request silently
+ */
 //      proxy_gen_response(request, 403 /*forbidden*/);
       return STS_FAILURE;
    }
@@ -377,7 +378,10 @@ int proxy_response (sip_t *response) {
       break;
    
    default:
-      DEBUGC(DBCLASS_PROXY,"response: refuse to proxy - UA not registered?");
+      DEBUGC(DBCLASS_PROXY,"proxy_response: refused to proxy");
+      WARN("response from/to unregistered UA (%s@%s)",
+	        request->from->url->username,
+		request->from->url->host);
 /* some clients seem to run amok when passing back a negative response */
 //      proxy_gen_response(request, 403 /*forbidden*/);
       return STS_FAILURE;
@@ -494,8 +498,10 @@ int proxy_add_myvia (sip_t *request, int interface) {
 
    sts = via_init(&via);
    if (sts!=0) return STS_FAILURE; /* allocation failed */
+
    sts = via_parse(via, tmp);
    if (sts!=0) return STS_FAILURE;
+
    list_add(request->vias,via,0);
 
    return STS_SUCCESS;
@@ -694,9 +700,6 @@ int proxy_rewrite_invitation_body(sip_t *mymsg){
       memcpy (ptr, data2_c, strlen(data2_c));
    }
 
-
-
-
 }
 
    /* remove old body */

src/register.c

@@ -143,7 +143,7 @@ int register_client(sip_t *my_msg) {
    }
 
    if (i >= URLMAP_SIZE) {
-      /* entry no existing, create new one */
+      /* entry not existing, create new one */
       i=j;
       DEBUGC(DBCLASS_REG,"create new entry for %s@%s at slot=%i",
              url1_contact->username, url1_contact->host, i);

src/utils.c

@@ -63,6 +63,14 @@ sip_t *msg_make_template_reply (sip_t * request, int code) {
    msg_setstatuscode (response, tmp);
    msg_setreasonphrase (response, msg_getreason (code));
 
+   if (request->to==NULL) {
+      ERROR("msg_make_template_reply: empty To in request header");
+   }
+
+   if (request->from==NULL) {
+      ERROR("msg_make_template_reply: empty From in request header");
+   }
+
    to_clone (request->to, &response->to);
    from_clone (request->from, &response->from);
 
@@ -102,7 +110,7 @@ int check_vialoop (sip_t *my_msg) {
 
    found_own_via=0;
    pos = 1;	/* for detecting a loop, don't check the first entry 
-   		   as this is my VIA! */
+   		   as this is my own VIA! */
    while (!list_eol (my_msg->vias, pos)) {
       via_t *via;
       via = (via_t *) list_get (my_msg->vias, pos);
@@ -179,7 +187,15 @@ int get_ip_by_host(char *hostname, struct in_addr *addr) {
    } dns_cache[DNS_CACHE_SIZE];
    static int cache_initialized=0;
 
-   if (hostname == NULL) return STS_FAILURE;
+   if (hostname == NULL) {
+      ERROR("get_ip_by_host: NULL hostname requested");
+      return STS_FAILURE;
+   }
+
+   if (addr == NULL) {
+      ERROR("get_ip_by_host: NULL in_addr passed");
+      return STS_FAILURE;
+   }
 
    /* first time: initialize DNS cache */
    if (cache_initialized == 0) {
@@ -260,7 +276,20 @@ int get_ip_by_host(char *hostname, struct in_addr *addr) {
 int compare_url(url_t *url1, url_t *url2) {
    int sts;
 
-   if ((url1 == NULL) || (url2 == NULL)) return STS_FAILURE;
+   if ((url1 == NULL) || (url2 == NULL)) {
+      ERROR("compare_url: NULL ptr: url1=0x%p, url2=0x%p",url1, url2);
+      return STS_FAILURE;
+   }
+   if ((url1->username == NULL) || (url2->username == NULL)) {
+      ERROR("compare_url: NULL ptr: url1->username=0x%p, url2->username=0x%p",
+            url1->username, url2->username);
+      return STS_FAILURE;
+   }
+   if ((url1->host == NULL) || (url2->host == NULL)) {
+      ERROR("compare_url: NULL ptr: url1->host=0x%p, url2->host=0x%p",
+            url1->host, url2->host);
+      return STS_FAILURE;
+   }
 
    /* comparison of hosts should be based on IP addresses, no? */
    DEBUGC(DBCLASS_BABBLE, "comparing urls: %s@%s -> %s@%s",