diff options
author | Matthew Jordan <mjordan@digium.com> | 2015-02-12 20:34:37 +0000 |
---|---|---|
committer | Matthew Jordan <mjordan@digium.com> | 2015-02-12 20:34:37 +0000 |
commit | 29f66b0429f4314e082bebcf0630b016b317cba3 (patch) | |
tree | ef1ca239afe19ed5ac43cee1bd46c4678393dd21 /res | |
parent | 9d081ed06cc32380d541ce4cb317bc23c32dee56 (diff) |
ARI/PJSIP: Add the ability to redirect (transfer) a channel in a Stasis app
This patch adds a new feature to ARI to redirect a channel to another server,
and fixes a few bugs in PJSIP's handling of the Transfer dialplan
application/ARI redirect capability.
*New Feature*
A new operation has been added to the ARI channels resource, redirect. With
this, a channel in a Stasis application can be redirected to another endpoint
of the same underlying channel technology.
*Bug fixes*
In the process of writing this new feature, two bugs were fixed in the PJSIP
stack:
(1) The existing .transfer channel callback had the limitation that it could
only transfer channels to a SIP URI, i.e., you had to pass
'PJSIP/sip:foo@my_provider.com' to the dialplan application. While this is
still supported, it is somewhat unintuitive - particularly in a world full
of endpoints. As such, we now also support specifying the PJSIP endpoint to
transfer to.
(2) res_pjsip_multihomed was, unfortunately, trying to 'help' a 302 redirect by
updating its Contact header. Alas, that resulted in the forwarding
destination set by the dialplan application/ARI resource/whatever being
rewritten with very incorrect information. Hence, we now don't bother
updating an outgoing response if it is a 302. Since this took a looong time
to find, some additional debug statements have been added to those modules
that update the Contact headers.
Review: https://reviewboard.asterisk.org/r/4316/
ASTERISK-24015 #close
Reported by: Private Name
ASTERISK-24703 #close
Reported by: Matt Jordan
........
Merged revisions 431717 from http://svn.asterisk.org/svn/asterisk/branches/13
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@431718 65c4cc65-6c06-0410-ace0-fbb531ad65f3
Diffstat (limited to 'res')
-rw-r--r-- | res/ari/resource_channels.c | 58 | ||||
-rw-r--r-- | res/ari/resource_channels.h | 26 | ||||
-rw-r--r-- | res/res_ari_channels.c | 113 | ||||
-rw-r--r-- | res/res_pjsip_multihomed.c | 5 | ||||
-rw-r--r-- | res/res_pjsip_nat.c | 3 | ||||
-rw-r--r-- | res/res_pjsip_transport_websocket.c | 2 | ||||
-rw-r--r-- | res/stasis/control.c | 32 |
7 files changed, 236 insertions, 3 deletions
diff --git a/res/ari/resource_channels.c b/res/ari/resource_channels.c index 24aabe588..67498af9f 100644 --- a/res/ari/resource_channels.c +++ b/res/ari/resource_channels.c @@ -156,6 +156,64 @@ void ast_ari_channels_continue_in_dialplan( ast_ari_response_no_content(response); } +void ast_ari_channels_redirect(struct ast_variable *headers, + struct ast_ari_channels_redirect_args *args, + struct ast_ari_response *response) +{ + RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup); + RAII_VAR(struct ast_channel_snapshot *, chan_snapshot, NULL, ao2_cleanup); + char *tech; + char *resource; + int tech_len; + + control = find_control(response, args->channel_id); + if (!control) { + return; + } + + if (ast_strlen_zero(args->endpoint)) { + ast_ari_response_error(response, 400, "Not Found", + "Required parameter 'endpoint' not provided."); + return; + } + + tech = ast_strdupa(args->endpoint); + if (!(resource = strchr(tech, '/')) || !(tech_len = resource - tech)) { + ast_ari_response_error(response, 422, "Unprocessable Entity", + "Endpoint parameter '%s' does not contain tech/resource", args->endpoint); + return; + } + + *resource++ = '\0'; + if (ast_strlen_zero(resource)) { + ast_ari_response_error(response, 422, "Unprocessable Entity", + "No resource provided in endpoint parameter '%s'", args->endpoint); + return; + } + + chan_snapshot = ast_channel_snapshot_get_latest(args->channel_id); + if (!chan_snapshot) { + ast_ari_response_error(response, 500, "Internal Server Error", + "Unable to find channel snapshot for '%s'", args->channel_id); + return; + } + + if (strncasecmp(chan_snapshot->type, tech, tech_len)) { + ast_ari_response_error(response, 422, "Unprocessable Entity", + "Endpoint technology '%s' does not match channel technology '%s'", + tech, chan_snapshot->type); + return; + } + + if (stasis_app_control_redirect(control, resource)) { + ast_ari_response_error(response, 500, "Internal Server Error", + "Failed to redirect channel"); + return; + } + + ast_ari_response_no_content(response); +} + void ast_ari_channels_answer(struct ast_variable *headers, struct ast_ari_channels_answer_args *args, struct ast_ari_response *response) diff --git a/res/ari/resource_channels.h b/res/ari/resource_channels.h index bd3b6205c..4d3ad5f8b 100644 --- a/res/ari/resource_channels.h +++ b/res/ari/resource_channels.h @@ -221,6 +221,32 @@ int ast_ari_channels_continue_in_dialplan_parse_body( * \param[out] response HTTP response */ void ast_ari_channels_continue_in_dialplan(struct ast_variable *headers, struct ast_ari_channels_continue_in_dialplan_args *args, struct ast_ari_response *response); +/*! Argument struct for ast_ari_channels_redirect() */ +struct ast_ari_channels_redirect_args { + /*! Channel's id */ + const char *channel_id; + /*! The endpoint to redirect the channel to */ + const char *endpoint; +}; +/*! + * \brief Body parsing function for /channels/{channelId}/redirect. + * \param body The JSON body from which to parse parameters. + * \param[out] args The args structure to parse into. + * \retval zero on success + * \retval non-zero on failure + */ +int ast_ari_channels_redirect_parse_body( + struct ast_json *body, + struct ast_ari_channels_redirect_args *args); + +/*! + * \brief Redirect the channel to a different location. + * + * \param headers HTTP headers + * \param args Swagger parameters + * \param[out] response HTTP response + */ +void ast_ari_channels_redirect(struct ast_variable *headers, struct ast_ari_channels_redirect_args *args, struct ast_ari_response *response); /*! Argument struct for ast_ari_channels_answer() */ struct ast_ari_channels_answer_args { /*! Channel's id */ diff --git a/res/res_ari_channels.c b/res/res_ari_channels.c index 20128ae02..a088705ad 100644 --- a/res/res_ari_channels.c +++ b/res/res_ari_channels.c @@ -707,6 +707,106 @@ static void ast_ari_channels_continue_in_dialplan_cb( fin: __attribute__((unused)) return; } +int ast_ari_channels_redirect_parse_body( + struct ast_json *body, + struct ast_ari_channels_redirect_args *args) +{ + struct ast_json *field; + /* Parse query parameters out of it */ + field = ast_json_object_get(body, "endpoint"); + if (field) { + args->endpoint = ast_json_string_get(field); + } + return 0; +} + +/*! + * \brief Parameter parsing callback for /channels/{channelId}/redirect. + * \param get_params GET parameters in the HTTP request. + * \param path_vars Path variables extracted from the request. + * \param headers HTTP headers. + * \param[out] response Response to the HTTP request. + */ +static void ast_ari_channels_redirect_cb( + struct ast_tcptls_session_instance *ser, + struct ast_variable *get_params, struct ast_variable *path_vars, + struct ast_variable *headers, struct ast_ari_response *response) +{ + struct ast_ari_channels_redirect_args args = {}; + struct ast_variable *i; + RAII_VAR(struct ast_json *, body, NULL, ast_json_unref); +#if defined(AST_DEVMODE) + int is_valid; + int code; +#endif /* AST_DEVMODE */ + + for (i = get_params; i; i = i->next) { + if (strcmp(i->name, "endpoint") == 0) { + args.endpoint = (i->value); + } else + {} + } + for (i = path_vars; i; i = i->next) { + if (strcmp(i->name, "channelId") == 0) { + args.channel_id = (i->value); + } else + {} + } + /* Look for a JSON request entity */ + body = ast_http_get_json(ser, headers); + if (!body) { + switch (errno) { + case EFBIG: + ast_ari_response_error(response, 413, "Request Entity Too Large", "Request body too large"); + goto fin; + case ENOMEM: + ast_ari_response_error(response, 500, "Internal Server Error", "Error processing request"); + goto fin; + case EIO: + ast_ari_response_error(response, 400, "Bad Request", "Error parsing request body"); + goto fin; + } + } + if (ast_ari_channels_redirect_parse_body(body, &args)) { + ast_ari_response_alloc_failed(response); + goto fin; + } + ast_ari_channels_redirect(headers, &args, response); +#if defined(AST_DEVMODE) + code = response->response_code; + + switch (code) { + case 0: /* Implementation is still a stub, or the code wasn't set */ + is_valid = response->message == NULL; + break; + case 500: /* Internal Server Error */ + case 501: /* Not Implemented */ + case 400: /* Endpoint parameter not provided */ + case 404: /* Channel or endpoint not found */ + case 409: /* Channel not in a Stasis application */ + case 422: /* Endpoint is not the same type as the channel */ + is_valid = 1; + break; + default: + if (200 <= code && code <= 299) { + is_valid = ast_ari_validate_void( + response->message); + } else { + ast_log(LOG_ERROR, "Invalid error response %d for /channels/{channelId}/redirect\n", code); + is_valid = 0; + } + } + + if (!is_valid) { + ast_log(LOG_ERROR, "Response validation failed for /channels/{channelId}/redirect\n"); + ast_ari_response_error(response, 500, + "Internal Server Error", "Response validation failed"); + } +#endif /* AST_DEVMODE */ + +fin: __attribute__((unused)) + return; +} /*! * \brief Parameter parsing callback for /channels/{channelId}/answer. * \param get_params GET parameters in the HTTP request. @@ -2462,6 +2562,15 @@ static struct stasis_rest_handlers channels_channelId_continue = { .children = { } }; /*! \brief REST handler for /api-docs/channels.{format} */ +static struct stasis_rest_handlers channels_channelId_redirect = { + .path_segment = "redirect", + .callbacks = { + [AST_HTTP_POST] = ast_ari_channels_redirect_cb, + }, + .num_children = 0, + .children = { } +}; +/*! \brief REST handler for /api-docs/channels.{format} */ static struct stasis_rest_handlers channels_channelId_answer = { .path_segment = "answer", .callbacks = { @@ -2595,8 +2704,8 @@ static struct stasis_rest_handlers channels_channelId = { [AST_HTTP_POST] = ast_ari_channels_originate_with_id_cb, [AST_HTTP_DELETE] = ast_ari_channels_hangup_cb, }, - .num_children = 12, - .children = { &channels_channelId_continue,&channels_channelId_answer,&channels_channelId_ring,&channels_channelId_dtmf,&channels_channelId_mute,&channels_channelId_hold,&channels_channelId_moh,&channels_channelId_silence,&channels_channelId_play,&channels_channelId_record,&channels_channelId_variable,&channels_channelId_snoop, } + .num_children = 13, + .children = { &channels_channelId_continue,&channels_channelId_redirect,&channels_channelId_answer,&channels_channelId_ring,&channels_channelId_dtmf,&channels_channelId_mute,&channels_channelId_hold,&channels_channelId_moh,&channels_channelId_silence,&channels_channelId_play,&channels_channelId_record,&channels_channelId_variable,&channels_channelId_snoop, } }; /*! \brief REST handler for /api-docs/channels.{format} */ static struct stasis_rest_handlers channels = { diff --git a/res/res_pjsip_multihomed.c b/res/res_pjsip_multihomed.c index ca56b7c47..e1abff34f 100644 --- a/res/res_pjsip_multihomed.c +++ b/res/res_pjsip_multihomed.c @@ -146,12 +146,15 @@ static pj_status_t multihomed_on_tx_message(pjsip_tx_data *tdata) if (tdata->msg->type == PJSIP_REQUEST_MSG || !(cseq = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_CSEQ, NULL)) || pj_strcmp2(&cseq->method.name, "REGISTER")) { pjsip_contact_hdr *contact = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_CONTACT, NULL); - if (contact && (PJSIP_URI_SCHEME_IS_SIP(contact->uri) || PJSIP_URI_SCHEME_IS_SIPS(contact->uri))) { + if (contact && (PJSIP_URI_SCHEME_IS_SIP(contact->uri) || PJSIP_URI_SCHEME_IS_SIPS(contact->uri)) + && !(tdata->msg->type == PJSIP_RESPONSE_MSG && tdata->msg->line.status.code / 100 == 3)) { pjsip_sip_uri *uri = pjsip_uri_get_uri(contact->uri); /* prm.ret_addr is allocated from the tdata pool OR the transport so it is perfectly fine to just do an assignment like this */ pj_strassign(&uri->host, &prm.ret_addr); uri->port = prm.ret_port; + ast_debug(4, "Re-wrote Contact URI host/port to %.*s:%d\n", + (int)pj_strlen(&uri->host), pj_strbuf(&uri->host), uri->port); pjsip_tx_data_invalidate_msg(tdata); } diff --git a/res/res_pjsip_nat.c b/res/res_pjsip_nat.c index 588734352..b71a84bbd 100644 --- a/res/res_pjsip_nat.c +++ b/res/res_pjsip_nat.c @@ -52,6 +52,8 @@ static pj_bool_t handle_rx_message(struct ast_sip_endpoint *endpoint, pjsip_rx_d uri->transport_param.slen = 0; } uri->port = rdata->pkt_info.src_port; + ast_debug(4, "Re-wrote Contact URI host/port to %.*s:%d\n", + (int)pj_strlen(&uri->host), pj_strbuf(&uri->host), uri->port); /* rewrite the session target since it may have already been pulled from the contact header */ if (dlg && (!dlg->remote.contact @@ -205,6 +207,7 @@ static pj_status_t nat_on_tx_message(pjsip_tx_data *tdata) pj_strdup2(tdata->pool, &uri->host, ast_sockaddr_stringify_host(&transport->external_address)); if (transport->external_signaling_port) { uri->port = transport->external_signaling_port; + ast_debug(4, "Re-wrote Contact URI port to %d\n", uri->port); } } diff --git a/res/res_pjsip_transport_websocket.c b/res/res_pjsip_transport_websocket.c index 5616715e0..94902d65b 100644 --- a/res/res_pjsip_transport_websocket.c +++ b/res/res_pjsip_transport_websocket.c @@ -329,6 +329,8 @@ static pj_bool_t websocket_on_rx_msg(pjsip_rx_data *rdata) pj_cstr(&uri->host, rdata->pkt_info.src_name); uri->port = rdata->pkt_info.src_port; + ast_debug(4, "Re-wrote Contact URI host/port to %.*s:%d\n", + (int)pj_strlen(&uri->host), pj_strbuf(&uri->host), uri->port); pj_strdup(rdata->tp_info.pool, &uri->transport_param, (type == (long)transport_type_ws) ? &STR_WS : &STR_WSS); } diff --git a/res/stasis/control.c b/res/stasis/control.c index 7dc1220cf..e239de29b 100644 --- a/res/stasis/control.c +++ b/res/stasis/control.c @@ -428,6 +428,38 @@ int stasis_app_control_continue(struct stasis_app_control *control, const char * return 0; } +static int app_control_redirect(struct stasis_app_control *control, + struct ast_channel *chan, void *data) +{ + char *endpoint = data; + int res; + + ast_assert(control->channel != NULL); + ast_assert(endpoint != NULL); + + res = ast_transfer(control->channel, endpoint); + if (!res) { + ast_log(LOG_NOTICE, "Unsupported transfer requested on channel '%s'\n", + ast_channel_name(control->channel)); + return 0; + } + + return 0; +} + +int stasis_app_control_redirect(struct stasis_app_control *control, const char *endpoint) +{ + char *endpoint_data = ast_strdup(endpoint); + + if (!endpoint_data) { + return -1; + } + + stasis_app_send_command_async(control, app_control_redirect, endpoint_data, ast_free_ptr); + + return 0; +} + struct stasis_app_control_dtmf_data { int before; int between; |