Fix a few fax gateway failures

Fax gateway requires knowledge of a channel's peer in a bridge. This patch
now uses the supported mechanisms to get this information.

This is acceptable for a few reasons:
* Fax gateway can only ever work in a 2-party bridge
* Fax gateway cannot work when not in a bridge
* Fax gateway cannot work without knowledge of the capabilities of both
  channels in the fax operation (it is, after all, a gateway)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@389799 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/res/res_fax.c b/res/res_fax.c
index 4b942e5..1886a32 100644 (file)
--- a/res/res_fax.c
+++ b/res/res_fax.c
@@ -1804,8 +1804,8 @@ static int receivefax_exec(struct ast_channel *chan, const char *data)
 {
        char *parse, modems[128] = "";
        int channel_alive;
-       RAII_VAR(struct ast_fax_session_details *, details, NULL, ao2_cleanup);
        RAII_VAR(struct ast_fax_session *, s, NULL, ao2_cleanup);
+       RAII_VAR(struct ast_fax_session_details *, details, NULL, ao2_cleanup);
        struct ast_fax_tech_token *token = NULL;
        struct ast_fax_document *doc;
        AST_DECLARE_APP_ARGS(args,
@@ -2285,8 +2285,8 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
 {
        char *parse, *filenames, *c, modems[128] = "";
        int channel_alive, file_count;
-       RAII_VAR(struct ast_fax_session_details *, details, NULL, ao2_cleanup);
-       RAII_VAR(struct ast_fax_session *, s, NULL, ao2_cleanup);
+       struct ast_fax_session_details *details;
+       struct ast_fax_session *s;
        struct ast_fax_tech_token *token = NULL;
        struct ast_fax_document *doc;
        AST_DECLARE_APP_ARGS(args,
@@ -2321,6 +2321,7 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
                ast_string_field_set(details, resultstr, "can't send a fax on a channel with a T.38 gateway");
                set_channel_variables(chan, details);
                ast_log(LOG_ERROR, "executing SendFAX on a channel with a T.38 Gateway is not supported\n");
+               ao2_ref(details, -1);
                return -1;
        }
 
@@ -2329,6 +2330,7 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
                ast_string_field_set(details, resultstr, "maxrate is less than minrate");
                set_channel_variables(chan, details);
                ast_log(LOG_ERROR, "maxrate %d is less than minrate %d\n", details->maxrate, details->minrate);
+               ao2_ref(details, -1);
                return -1;
        }
 
@@ -2338,6 +2340,7 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
                ast_string_field_set(details, error, "INVALID_ARGUMENTS");
                ast_string_field_set(details, resultstr, "incompatible 'modems' and 'minrate' settings");
                set_channel_variables(chan, details);
+               ao2_ref(details, -1);
                return -1;
        }
 
@@ -2347,6 +2350,7 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
                ast_string_field_set(details, error, "INVALID_ARGUMENTS");
                ast_string_field_set(details, resultstr, "incompatible 'modems' and 'maxrate' settings");
                set_channel_variables(chan, details);
+               ao2_ref(details, -1);
                return -1;
        }
 
@@ -2355,6 +2359,7 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
                ast_string_field_set(details, resultstr, "invalid arguments");
                set_channel_variables(chan, details);
                ast_log(LOG_WARNING, "%s requires an argument (filename[&filename[&filename]][,options])\n", app_sendfax);
+               ao2_ref(details, -1);
                return -1;
        }
        parse = ast_strdupa(data);
@@ -2366,6 +2371,7 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
                ast_string_field_set(details, error, "INVALID_ARGUMENTS");
                ast_string_field_set(details, resultstr, "invalid arguments");
                set_channel_variables(chan, details);
+               ao2_ref(details, -1);
                return -1;
        }
        if (ast_strlen_zero(args.filenames)) {
@@ -2373,6 +2379,7 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
                ast_string_field_set(details, resultstr, "invalid arguments");
                set_channel_variables(chan, details);
                ast_log(LOG_WARNING, "%s requires an argument (filename[&filename[&filename]],options])\n", app_sendfax);
+               ao2_ref(details, -1);
                return -1;
        }
 
@@ -2382,6 +2389,7 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
                ast_string_field_set(details, resultstr, "invalid arguments");
                set_channel_variables(chan, details);
                ast_log(LOG_WARNING, "%s does not support polling\n", app_sendfax);
+               ao2_ref(details, -1);
                return -1;
        }
 
@@ -2395,6 +2403,7 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
                        ast_string_field_set(details, resultstr, "error reading file");
                        set_channel_variables(chan, details);
                        ast_log(LOG_ERROR, "access failure.  Verify '%s' exists and check permissions.\n", args.filenames);
+                       ao2_ref(details, -1);
                        return -1;
                }
 
@@ -2403,6 +2412,7 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
                        ast_string_field_set(details, resultstr, "error allocating memory");
                        set_channel_variables(chan, details);
                        ast_log(LOG_ERROR, "System cannot provide memory for session requirements.\n");
+                       ao2_ref(details, -1);
                        return -1;
                }
 
@@ -2447,6 +2457,7 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
                ast_string_field_set(details, resultstr, "error reserving fax session");
                set_channel_variables(chan, details);
                ast_log(LOG_ERROR, "Unable to reserve FAX session.\n");
+               ao2_ref(details, -1);
                return -1;
        }
 
@@ -2457,6 +2468,8 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
                        set_channel_variables(chan, details);
                        ast_log(LOG_WARNING, "Channel '%s' failed answer attempt.\n", ast_channel_name(chan));
                        fax_session_release(s, token);
+                       ao2_ref(s, -1);
+                       ao2_ref(details, -1);
                        return -1;
                }
        }
@@ -2467,6 +2480,8 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
                        ast_string_field_set(details, resultstr, "error negotiating T.38");
                        set_channel_variables(chan, details);
                        fax_session_release(s, token);
+                       ao2_ref(s, -1);
+                       ao2_ref(details, -1);
                        return -1;
                }
        } else {
@@ -2479,6 +2494,8 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
                        ast_string_field_set(details, resultstr, "error negotiating T.38");
                        set_channel_variables(chan, details);
                        fax_session_release(s, token);
+                       ao2_ref(s, -1);
+                       ao2_ref(details, -1);
                        ast_log(LOG_ERROR, "error initializing channel '%s' in T.38 mode\n", ast_channel_name(chan));
                        return -1;
                }
@@ -2506,6 +2523,9 @@ static int sendfax_exec(struct ast_channel *chan, const char *data)
                ast_log(AST_LOG_ERROR, "Error publishing SendFAX status message\n");
        }
 
+       ao2_ref(s, -1);
+       ao2_ref(details, -1);
+
        /* If the channel hungup return -1; otherwise, return 0 to continue in the dialplan */
        return (!channel_alive) ? -1 : 0;
 }
@@ -2977,8 +2997,9 @@ static void fax_gateway_framehook_destroy(void *data) {
  */
 static struct ast_frame *fax_gateway_framehook(struct ast_channel *chan, struct ast_frame *f, enum ast_framehook_event event, void *data) {
        struct fax_gateway *gateway = data;
-       struct ast_channel *peer, *active;
-       struct ast_fax_session_details *details;
+       struct ast_channel *active;
+       RAII_VAR(struct ast_fax_session_details *, details, NULL, ao2_cleanup);
+       RAII_VAR(struct ast_channel *, peer, NULL, ao2_cleanup);
 
        if (gateway->s) {
                details = gateway->s->details;
@@ -2999,31 +3020,26 @@ static struct ast_frame *fax_gateway_framehook(struct ast_channel *chan, struct
                        ast_set_read_format(chan, &gateway->chan_read_format);
                        ast_set_read_format(chan, &gateway->chan_write_format);
 
-                       if ((peer = ast_bridged_channel(chan))) {
+                       if ((peer = ast_channel_bridge_peer(chan))) {
                                ast_set_read_format(peer, &gateway->peer_read_format);
                                ast_set_read_format(peer, &gateway->peer_write_format);
                                ast_channel_make_compatible(chan, peer);
                        }
                }
-
-               ao2_ref(details, -1);
                return NULL;
        }
 
        if (!f || (event == AST_FRAMEHOOK_EVENT_ATTACHED)) {
-               ao2_ref(details, -1);
                return NULL;
        };
 
        /* this frame was generated by the fax gateway, pass it on */
        if (ast_test_flag(f, AST_FAX_FRFLAG_GATEWAY)) {
-               ao2_ref(details, -1);
                return f;
        }
 
-       if (!(peer = ast_bridged_channel(chan))) {
-               /* not bridged, don't do anything */
-               ao2_ref(details, -1);
+       /* If we aren't bridged or we don't have a peer, don't do anything */
+       if (!(peer = ast_channel_bridge_peer(chan))) {
                return f;
        }
 
@@ -3038,7 +3054,6 @@ static struct ast_frame *fax_gateway_framehook(struct ast_channel *chan, struct
                        ast_string_field_set(details, resultstr, "neither channel supports T.38");
                        ast_string_field_set(details, error, "T38_NEG_ERROR");
                        set_channel_variables(chan, details);
-                       ao2_ref(details, -1);
                        return f;
                }
 
@@ -3074,7 +3089,6 @@ static struct ast_frame *fax_gateway_framehook(struct ast_channel *chan, struct
                        ast_string_field_build(details, resultstr, "no fax activity after %d ms", details->gateway_timeout);
                        ast_string_field_set(details, error, "TIMEOUT");
                        set_channel_variables(chan, details);
-                       ao2_ref(details, -1);
                        return f;
                }
        }
@@ -3088,7 +3102,6 @@ static struct ast_frame *fax_gateway_framehook(struct ast_channel *chan, struct
                case AST_FORMAT_ULAW:
                        break;
                default:
-                       ao2_ref(details, -1);
                        return f;
                }
                break;
@@ -3096,16 +3109,13 @@ static struct ast_frame *fax_gateway_framehook(struct ast_channel *chan, struct
                if (f->subclass.integer == AST_MODEM_T38) {
                        break;
                }
-               ao2_ref(details, -1);
                return f;
        case AST_FRAME_CONTROL:
                if (f->subclass.integer == AST_CONTROL_T38_PARAMETERS) {
                        break;
                }
-               ao2_ref(details, -1);
                return f;
        default:
-               ao2_ref(details, -1);
                return f;
        }
 
@@ -3119,20 +3129,17 @@ static struct ast_frame *fax_gateway_framehook(struct ast_channel *chan, struct
                break;
        default:
                ast_log(LOG_WARNING, "unhandled framehook event %i\n", event);
-               ao2_ref(details, -1);
                return f;
        }
 
        /* handle control frames */
        if (f->frametype == AST_FRAME_CONTROL && f->subclass.integer == AST_CONTROL_T38_PARAMETERS) {
-               ao2_ref(details, -1);
                return fax_gateway_detect_t38(gateway, chan, peer, active, f);
        }
 
        if (!gateway->detected_v21 && gateway->t38_state == T38_STATE_UNAVAILABLE && f->frametype == AST_FRAME_VOICE) {
                /* not in gateway mode and have not detected v21 yet, listen
                 * for v21 */
-               ao2_ref(details, -1);
                return fax_gateway_detect_v21(gateway, chan, peer, active, f);
        }
 
@@ -3143,7 +3150,6 @@ static struct ast_frame *fax_gateway_framehook(struct ast_channel *chan, struct
                if ((f->frametype == AST_FRAME_VOICE) && (f->subclass.format.id != AST_FORMAT_SLINEAR)) {
                        if (ast_channel_readtrans(active) && (f = ast_translate(ast_channel_readtrans(active), f, 1)) == NULL) {
                                f = &ast_null_frame;
-                               ao2_ref(details, -1);
                                return f;
                        }
                }
@@ -3159,7 +3165,6 @@ static struct ast_frame *fax_gateway_framehook(struct ast_channel *chan, struct
                        ast_frfree(f);
                }
                f = &ast_null_frame;
-               ao2_ref(details, -1);
                return f;
        }
 
@@ -3175,16 +3180,12 @@ static struct ast_frame *fax_gateway_framehook(struct ast_channel *chan, struct
                        };
                        ast_format_set(&silence_frame.subclass.format, AST_FORMAT_SLINEAR, 0);
                        memset(silence_buf, 0, sizeof(silence_buf));
-
-                       ao2_ref(details, -1);
                        return ast_frisolate(&silence_frame);
                } else {
-                       ao2_ref(details, -1);
                        return &ast_null_frame;
                }
        }
 
-       ao2_ref(details, -1);
        return f;
 }
 
@@ -3308,7 +3309,7 @@ static struct ast_frame *fax_detect_framehook(struct ast_channel *chan, struct a
        struct fax_detect *faxdetect = data;
        struct ast_fax_session_details *details;
        struct ast_control_t38_parameters *control_params;
-       struct ast_channel *peer;
+       RAII_VAR(struct ast_channel *, peer, NULL, ao2_cleanup);
        int result = 0;
 
        details = faxdetect->details;
@@ -3333,7 +3334,7 @@ static struct ast_frame *fax_detect_framehook(struct ast_channel *chan, struct a
        case AST_FRAMEHOOK_EVENT_DETACHED:
                /* restore audio formats when we are detached */
                ast_set_read_format(chan, &faxdetect->orig_format);
-               if ((peer = ast_bridged_channel(chan))) {
+               if ((peer = ast_channel_bridge_peer(chan))) {
                        ast_channel_make_compatible(chan, peer);
                }
                return NULL;