Merged revisions 90735 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
r90735 | mmichelson | 2007-12-03 17:12:17 -0600 (Mon, 03 Dec 2007) | 22 lines

A big one...

This is the merge of the forward-loop branch. The main change here is that call-forwards can no longer loop.
This is accomplished by creating a datastore on the calling channel which has a linked list of all devices
dialed. If a forward happens, then the local channel which is created inherits the datastore. If, through this
progression of forwards and datastore inheritance, a device is attempted to be dialed a second time, it will simply
be skipped and a warning message will be printed to the CLI. After the dialing has been completed, the datastore
is detached from the channel and destroyed.

This change also introduces some side effects to the code which I shall enumerate here:

1. Datastore inheritance has been backported from trunk into 1.4
2. A large chunk of code has been removed from app_dial. This chunk is the section of code
   which handles the call forward case after the channel has been requested but before it has
   been called. This was removed because call-forwarding still works fine without it, it makes the
   code less error-prone should it need changing, and it made this set of changes much less painful
   to just have the forwarding handled in one place in each module.
3. Two new files, global_datastores.h and .c have been added. These are necessary since the datastore
   which is attached to the channel may be created and attached in either app_dial or app_queue, so they
   need a common place to find the datastore info. This approach was taken in case similar datastores are
   needed in the future, there will be a common place to add them.

........


git-svn-id: http://svn.digium.com/svn/asterisk/trunk@90873 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 75 insertions, 69 deletions

diff --git a/apps/app_dial.c b/apps/app_dial.c
index a071f5e0f..20ea83e57 100644
--- a/apps/app_dial.c
+++ b/apps/app_dial.c
@@ -54,6 +54,7 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 #include "asterisk/manager.h"
 #include "asterisk/privacy.h"
 #include "asterisk/stringfields.h"
+#include "asterisk/global_datastores.h"
 
 static char *app = "Dial";
 
@@ -326,7 +327,6 @@ struct chanlist {
 	struct chanlist *next;
 	struct ast_channel *chan;
 	uint64_t flags;
-	int forwards;
 };
 
 
@@ -347,8 +347,6 @@ static void hanguptree(struct chanlist *outgoing, struct ast_channel *exception,
 	}
 }
 
-#define AST_MAX_FORWARDS   8
-
 #define AST_MAX_WATCHERS 256
 
 /*
@@ -480,28 +478,22 @@ static void do_forward(struct chanlist *o,
 		tech = "Local";
 	}
 	/* Before processing channel, go ahead and check for forwarding */
-	o->forwards++;
-	if (o->forwards < AST_MAX_FORWARDS) {
-		ast_verb(3, "Now forwarding %s to '%s/%s' (thanks to %s)\n", in->name, tech, stuff, c->name);
-		/* If we have been told to ignore forwards, just set this channel to null and continue processing extensions normally */
-		if (ast_test_flag64(peerflags, OPT_IGNORE_FORWARDING)) {
-			ast_verb(3, "Forwarding %s to '%s/%s' prevented.\n", in->name, tech, stuff);
-			c = o->chan = NULL;
-			cause = AST_CAUSE_BUSY;
-		} else {
-			/* Setup parameters */
-			c = o->chan = ast_request(tech, in->nativeformats, stuff, &cause);
-			if (c) {
-				if (single)
-					ast_channel_make_compatible(o->chan, in);
-				ast_channel_inherit_variables(in, o->chan);
-			} else
-				ast_log(LOG_NOTICE, "Unable to create local channel for call forward to '%s/%s' (cause = %d)\n", tech, stuff, cause);
-		}
-	} else {
-		ast_verb(3, "Too many forwards from %s\n", c->name);
-		cause = AST_CAUSE_CONGESTION;
+	ast_verb(3, "Now forwarding %s to '%s/%s' (thanks to %s)\n", in->name, tech, stuff, c->name);
+	/* If we have been told to ignore forwards, just set this channel to null and continue processing extensions normally */
+	if (ast_test_flag64(peerflags, OPT_IGNORE_FORWARDING)) {
+		ast_verb(3, "Forwarding %s to '%s/%s' prevented.\n", in->name, tech, stuff);
 		c = o->chan = NULL;
+		cause = AST_CAUSE_BUSY;
+	} else {
+		/* Setup parameters */
+		c = o->chan = ast_request(tech, in->nativeformats, stuff, &cause);
+		if (c) {
+			if (single)
+				ast_channel_make_compatible(o->chan, in);
+			ast_channel_inherit_variables(in, o->chan);
+			ast_channel_datastore_inherit(in, o->chan);
+		} else
+			ast_log(LOG_NOTICE, "Unable to create local channel for call forward to '%s/%s' (cause = %d)\n", tech, stuff, cause);
 	}
 	if (!c) {
 		ast_clear_flag64(o, DIAL_STILLGOING);	
@@ -1252,6 +1244,8 @@ static int dial_exec_full(struct ast_channel *chan, void *data, struct ast_flags
 	);
 	struct ast_flags64 opts = { 0, };
 	char *opt_args[OPT_ARG_ARRAY_SIZE];
+	struct ast_datastore *datastore;
+	int fulldial = 0, num_dialed = 0;
 
 	if (ast_strlen_zero(data)) {
 		ast_log(LOG_WARNING, "Dial requires an argument (technology/number)\n");
@@ -1333,7 +1327,13 @@ static int dial_exec_full(struct ast_channel *chan, void *data, struct ast_flags
 		struct ast_channel *tc;	/* channel for this destination */
 		/* Get a technology/[device:]number pair */
 		char *number = cur;
+		char *interface = ast_strdupa(number);
 		char *tech = strsep(&number, "/");
+		/* find if we already dialed this interface */
+		int dialed = 0;
+		struct ast_dialed_interface *di;
+		AST_LIST_HEAD(, ast_dialed_interface) *dialed_interfaces;
+		num_dialed++;
 		if (!number) {
 			ast_log(LOG_WARNING, "Dial argument takes format (technology/[device:]number1)\n");
 			goto out;
@@ -1353,6 +1353,50 @@ static int dial_exec_full(struct ast_channel *chan, void *data, struct ast_flags
 		}
 		ast_copy_string(numsubst, number, sizeof(numsubst));
 		/* Request the peer */
+		if (!(datastore = ast_channel_datastore_find(chan, &dialed_interface_info, NULL))) {
+			if(!(datastore = ast_channel_datastore_alloc(&dialed_interface_info, NULL))) {
+				ast_log(LOG_WARNING, "Unable to create channel datastore for dialed interfaces. Aborting!\n"); 
+				free(tmp);
+				goto out;
+			}
+			else {
+				datastore->inheritance = DATASTORE_INHERIT_FOREVER;
+				if((dialed_interfaces = ast_calloc(1, sizeof(*dialed_interfaces)))) {
+					datastore->data = dialed_interfaces;
+					AST_LIST_HEAD_INIT(dialed_interfaces);
+					ast_channel_datastore_add(chan, datastore);
+				} else {
+					free(tmp);
+					goto out;
+				}
+			}
+		} else 
+			dialed_interfaces = datastore->data;
+		AST_LIST_LOCK(dialed_interfaces);
+		AST_LIST_TRAVERSE(dialed_interfaces, di, list) {
+			/* XXX case sensitive??? */
+			if(!strcasecmp(di->interface, interface)) {
+				dialed = 1;
+				break;
+			}
+		}
+		if(!dialed && strcasecmp(tech, "Local")) {
+			if(!(di = ast_calloc(1, sizeof(*di) + strlen(interface)))) {
+				AST_LIST_UNLOCK(dialed_interfaces);
+				free(tmp);
+				goto out;
+			}
+			strcpy(di->interface, interface);
+			AST_LIST_INSERT_TAIL(dialed_interfaces, di, list);
+		} else {
+			AST_LIST_UNLOCK(dialed_interfaces);
+			ast_log(LOG_WARNING, "Skipping dialing interface '%s' again since it has already been dialed\n", di->interface);
+			fulldial++;
+			free(tmp);
+			continue;
+		}
+		AST_LIST_UNLOCK(dialed_interfaces);
+
 		tc = ast_request(tech, chan->nativeformats, numsubst, &cause);
 		if (!tc) {
 			/* If we can't, just go on to the next call */
@@ -1365,50 +1409,6 @@ static int dial_exec_full(struct ast_channel *chan, void *data, struct ast_flags
 			continue;
 		}
 		pbx_builtin_setvar_helper(tc, "DIALEDPEERNUMBER", numsubst);
-		if (!ast_strlen_zero(tc->call_forward)) {
-			char tmpchan[256];
-			char *stuff;
-			char *tech;
-			ast_copy_string(tmpchan, tc->call_forward, sizeof(tmpchan));
-			if ((stuff = strchr(tmpchan, '/'))) {
-				*stuff++ = '\0';
-				tech = tmpchan;
-			} else {
-				snprintf(tmpchan, sizeof(tmpchan), "%s@%s", tc->call_forward, tc->context);
-				stuff = tmpchan;
-				tech = "Local";
-			}
-			tmp->forwards++;
-			if (tmp->forwards < AST_MAX_FORWARDS) {
-				ast_verb(3, "Now forwarding %s to '%s/%s' (thanks to %s)\n",
-					chan->name, tech, stuff, tc->name);
-				ast_hangup(tc);
-				/* If we have been told to ignore forwards, just set this channel to null
-				 * and continue processing extensions normally */
-				if (ast_test_flag64(&opts, OPT_IGNORE_FORWARDING)) {
-					tc = NULL;
-					cause = AST_CAUSE_BUSY;
-					ast_verb(3, "Forwarding %s to '%s/%s' prevented.\n",
-							chan->name, tech, stuff);
-				} else {
-					tc = ast_request(tech, chan->nativeformats, stuff, &cause);
-				}
-				if (!tc)
-					ast_log(LOG_NOTICE, "Unable to create local channel for call forward to '%s/%s' (cause = %d)\n", tech, stuff, cause);
-				else
-					ast_channel_inherit_variables(chan, tc);
-			} else {
-				ast_verb(3, "Too many forwards from %s\n", tc->name);
-				ast_hangup(tc);
-				tc = NULL;
-				cause = AST_CAUSE_CONGESTION;
-			}
-			if (!tc) {
-				handle_cause(cause, &num);
-				ast_free(tmp);
-				continue;
-			}
-		}
 
 		/* Setup outgoing SDP to match incoming one */
 		ast_rtp_make_compatible(tc, chan, !outgoing && !rest);
@@ -1498,6 +1498,10 @@ static int dial_exec_full(struct ast_channel *chan, void *data, struct ast_flags
 
 	if (!outgoing) {
 		strcpy(pa.status, "CHANUNAVAIL");
+		if(fulldial == num_dialed) {
+			res = -1;
+			goto out;
+		}
 	} else {
 		/* Our status will at least be NOANSWER */
 		strcpy(pa.status, "NOANSWER");
@@ -1520,7 +1524,9 @@ static int dial_exec_full(struct ast_channel *chan, void *data, struct ast_flags
 
 	time(&start_time);
 	peer = wait_for_answer(chan, outgoing, &to, peerflags, &pa, &num, &result);
-	
+
+	ast_channel_datastore_remove(chan, datastore);
+	ast_channel_datastore_free(datastore);
 	if (!peer) {
 		if (result) {
 			res = result;