[Asterisk-code-review] res_pjsip_header_funcs: Add functions PJSIP_RESPONSE_HEADER and PJSIP... (asterisk[16])
José Lopes
asteriskteam at digium.com
Mon Jul 4 02:16:37 CDT 2022
José Lopes has uploaded this change for review. ( https://gerrit.asterisk.org/c/asterisk/+/18736 )
Change subject: res_pjsip_header_funcs: Add functions PJSIP_RESPONSE_HEADER and PJSIP_RESPONSE_HEADERS
......................................................................
res_pjsip_header_funcs: Add functions PJSIP_RESPONSE_HEADER and PJSIP_RESPONSE_HEADERS
These new functions allow retrieving information from headers on 200 OK
INVITE response.
ASTERISK-29999
Change-Id: I264a610a9333359297a0825feb29a1bb4f4ad144
---
A doc/CHANGES-staging/res_pjsip_header_funcs.txt
M res/res_pjsip_header_funcs.c
2 files changed, 247 insertions(+), 12 deletions(-)
git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/36/18736/1
diff --git a/doc/CHANGES-staging/res_pjsip_header_funcs.txt b/doc/CHANGES-staging/res_pjsip_header_funcs.txt
new file mode 100644
index 0000000..88946e4
--- /dev/null
+++ b/doc/CHANGES-staging/res_pjsip_header_funcs.txt
@@ -0,0 +1,5 @@
+Subject: res_pjsip_header_funcs
+
+Add function PJSIP_RESPONSE_HEADERS() to get list of header names from 200 response, in the same way as PJSIP_HEADERS() from the request.
+
+Add function PJSIP_RESPONSE_HEADER() to read header from 200 response, in the same way as PJSIP_HEADER() from the request.
diff --git a/res/res_pjsip_header_funcs.c b/res/res_pjsip_header_funcs.c
index fa6db34..cca2b78 100644
--- a/res/res_pjsip_header_funcs.c
+++ b/res/res_pjsip_header_funcs.c
@@ -4,6 +4,7 @@
* Copyright (C) 2013, Fairview 5 Engineering, LLC
*
* George Joseph <george.joseph at fairview5.com>
+ * José Lopes <jose.lopes at nfon.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
@@ -166,6 +167,89 @@
<ref type="function">PJSIP_HEADER</ref>
</see-also>
</function>
+ <function name="PJSIP_RESPONSE_HEADER" language="en_US">
+ <synopsis>
+ Gets headers of 200 response from an outbound PJSIP channel.
+ </synopsis>
+ <syntax>
+ <parameter name="action" required="true">
+ <enumlist>
+ <enum name="read">
+ <para>Returns instance <replaceable>number</replaceable>
+ of response header <replaceable>name</replaceable>.</para>
+ </enum>
+ </enumlist>
+ </parameter>
+
+ <parameter name="name" required="true">
+ <para>The <replaceable>name</replaceable> of the response header.
+ A <literal>*</literal> can be appended to the <replaceable>name</replaceable>
+ to iterate over all response headers <emphasis>beginning with</emphasis>
+ <replaceable>name</replaceable>.</para>
+ </parameter>
+
+ <parameter name="number" required="false">
+ <para>If there's more than 1 header with the same name, this specifies which header
+ to read. If not specified, defaults to <literal>1</literal> meaning
+ the first matching header.
+ </para>
+ </parameter>
+
+ </syntax>
+ <description>
+ <para>PJSIP_RESPONSE_HEADER allows you to read specific SIP headers of 200 response
+ from the outbound PJSIP channel.</para>
+ <para>Examples:</para>
+ <example title="Set 'somevar' to the value of the 'From' header">
+ exten => 1,1,Set(somevar=${PJSIP_RESPONSE_HEADER(read,From)})
+ </example>
+ <example title="Set 'via2' to the value of the 2nd 'Via' header">
+ exten => 1,1,Set(via2=${PJSIP_RESPONSE_HEADER(read,Via,2)})
+ </example>
+ <example title="Set 'xhdr' to the value of the 1sx X-header">
+ exten => 1,1,Set(xhdr=${PJSIP_RESPONSE_HEADER(read,X-*,1)})
+ </example>
+
+ <note><para>If you call PJSIP_RESPONSE_HEADER in a normal dialplan context you'll be
+ operating on the <emphasis>caller's (incoming)</emphasis> channel which
+ may not be what you want. To operate on the <emphasis>callee's (outgoing)</emphasis>
+ channel call PJSIP_RESPONSE_HEADER in a pre-connect handler.</para>
+ </note>
+ <example title="Usage on pre-connect handler">
+ [handler]
+ exten => readheader,1,NoOp(PJSIP_RESPONSE_HEADER(read,X-MyHeader))
+ [somecontext]
+ exten => 1,1,Dial(PJSIP/${EXTEN},,U(handler^readheader^1))
+ </example>
+ </description>
+ <see-also>
+ <ref type="function">PJSIP_RESPONSE_HEADERS</ref>
+ <ref type="function">PJSIP_HEADER</ref>
+ </see-also>
+ </function>
+ <function name="PJSIP_RESPONSE_HEADERS" language="en_US">
+ <synopsis>
+ Gets the list of SIP header names from the 200 response of INVITE message.
+ </synopsis>
+ <syntax>
+ <parameter name="prefix">
+ <para>If specified, only the headers matching the given prefix are returned.</para>
+ </parameter>
+ </syntax>
+ <description>
+ <para>Returns a comma-separated list of header names (without values) from the 200
+ response of INVITE message. Multiple headers with the same name are included in the
+ list only once.</para>
+ <para>For example, <literal>${PJSIP_RESPONSE_HEADERS(Co)}</literal> might return
+ <literal>Contact,Content-Length,Content-Type</literal>. As a practical example,
+ you may use <literal>${PJSIP_RESPONSE_HEADERS(X-)}</literal> to enumerate optional
+ extended headers.</para>
+ </description>
+ <see-also>
+ <ref type="function">PJSIP_RESPONSE_HEADER</ref>
+ <ref type="function">PJSIP_HEADERS</ref>
+ </see-also>
+ </function>
***/
@@ -180,6 +264,10 @@
static const struct ast_datastore_info header_datastore = {
.type = "header_datastore",
};
+/*! \brief Datastore for saving response headers */
+static const struct ast_datastore_info response_header_datastore = {
+ .type = "response_header_datastore",
+};
/*! \brief Data structure used for ast_sip_push_task_wait_serializer */
struct header_data {
@@ -189,6 +277,7 @@
char *buf;
int header_number;
size_t len;
+ const struct ast_datastore_info *header_datastore;
};
/*!
@@ -245,6 +334,42 @@
/*!
* \internal
+ * \brief Session supplement callback on an incoming INVITE response
+ *
+ * Retrieve the response_header_datastore from the session or create one if it doesn't exist.
+ * Create and initialize the list if needed.
+ * Insert the headers.
+ */
+static void incoming_response(struct ast_sip_session *session, pjsip_rx_data * rdata)
+{
+ pj_pool_t *pool = session->inv_session->dlg->pool;
+ RAII_VAR(struct ast_datastore *, datastore,
+ ast_sip_session_get_datastore(session, response_header_datastore.type), ao2_cleanup);
+ pjsip_status_line status = rdata->msg_info.msg->line.status;
+
+ /* Skip responses different of 200 OK, when 2xx is received. */
+ if (session->inv_session->state != PJSIP_INV_STATE_CONNECTING || status.code!=200) {
+ return;
+ }
+
+ if (!datastore) {
+ if (!(datastore =
+ ast_sip_session_alloc_datastore(&response_header_datastore, response_header_datastore.type))
+ ||
+ !(datastore->data = pj_pool_alloc(pool, sizeof(struct hdr_list))) ||
+ ast_sip_session_add_datastore(session, datastore)) {
+ ast_log(AST_LOG_ERROR, "Unable to create datastore for header functions.\n");
+ return;
+ }
+ AST_LIST_HEAD_INIT_NOLOCK((struct hdr_list *) datastore->data);
+ }
+ insert_headers(pool, (struct hdr_list *) datastore->data, rdata->msg_info.msg);
+
+ return;
+}
+
+/*!
+ * \internal
* \brief Search list for nth occurrence of specific header.
*/
static pjsip_hdr *find_header(struct hdr_list *list, const char *header_name,
@@ -270,7 +395,7 @@
/*!
* \internal
- * \brief Implements PJSIP_HEADERS by searching for the requested header prefix.
+ * \brief Implements PJSIP_HEADERS/PJSIP_RESPONSE_HEADERS by searching for the requested header prefix.
*
* Retrieve the header_datastore.
* Search for the all matching headers.
@@ -292,7 +417,7 @@
struct hdr_list *list;
RAII_VAR(struct ast_datastore *, datastore,
- ast_sip_session_get_datastore(data->channel->session, header_datastore.type),
+ ast_sip_session_get_datastore(data->channel->session, data->header_datastore->type),
ao2_cleanup);
if (!datastore || !datastore->data) {
@@ -354,10 +479,9 @@
return 0;
}
-
/*!
* \internal
- * \brief Implements PJSIP_HEADER 'read' by searching the for the requested header.
+ * \brief Implements PJSIP_HEADER/PJSIP_RESPONSE_HEADER 'read' by searching the for the requested header.
*
* Retrieve the header_datastore.
* Search for the nth matching header.
@@ -378,7 +502,7 @@
struct hdr_list *list;
int i = 1;
RAII_VAR(struct ast_datastore *, datastore,
- ast_sip_session_get_datastore(data->channel->session, header_datastore.type),
+ ast_sip_session_get_datastore(data->channel->session, data->header_datastore->type),
ao2_cleanup);
if (!datastore || !datastore->data) {
@@ -459,11 +583,11 @@
struct hdr_list *list;
RAII_VAR(struct ast_datastore *, datastore,
- ast_sip_session_get_datastore(session, header_datastore.type), ao2_cleanup);
+ ast_sip_session_get_datastore(session, data->header_datastore->type), ao2_cleanup);
if (!datastore) {
- if (!(datastore = ast_sip_session_alloc_datastore(&header_datastore,
- header_datastore.type))
+ if (!(datastore = ast_sip_session_alloc_datastore(data->header_datastore,
+ data->header_datastore->type))
|| !(datastore->data = pj_pool_alloc(pool, sizeof(struct hdr_list)))
|| ast_sip_session_add_datastore(session, datastore)) {
ast_log(AST_LOG_ERROR, "Unable to create datastore for header functions.\n");
@@ -502,7 +626,7 @@
struct header_data *data = obj;
pjsip_hdr *hdr = NULL;
RAII_VAR(struct ast_datastore *, datastore,
- ast_sip_session_get_datastore(data->channel->session, header_datastore.type),
+ ast_sip_session_get_datastore(data->channel->session, data->header_datastore->type),
ao2_cleanup);
if (!datastore || !datastore->data) {
@@ -539,7 +663,7 @@
struct hdr_list_entry *le;
int removed_count = 0;
RAII_VAR(struct ast_datastore *, datastore,
- ast_sip_session_get_datastore(data->channel->session, header_datastore.type),
+ ast_sip_session_get_datastore(data->channel->session, data->header_datastore->type),
ao2_cleanup);
if (!datastore || !datastore->data) {
@@ -597,13 +721,47 @@
header_data.header_value = NULL;
header_data.buf = buf;
header_data.len = len;
+ header_data.header_datastore = &header_datastore;
return ast_sip_push_task_wait_serializer(channel->session->serializer, read_headers, &header_data);
}
/*!
- * \brief Implements function 'read' callback.
+ * \brief Read list of unique SIP response headers
+ */
+static int func_response_read_headers(struct ast_channel *chan, const char *function, char *data, char *buf, size_t len)
+{
+ struct ast_sip_channel_pvt *channel = chan ? ast_channel_tech_pvt(chan) : NULL;
+ struct header_data header_data;
+ AST_DECLARE_APP_ARGS(args,
+ AST_APP_ARG(header_pattern);
+ );
+ AST_STANDARD_APP_ARGS(args, data);
+
+ if (!chan || strncmp(ast_channel_name(chan), "PJSIP/", 6)) {
+ ast_log(LOG_ERROR, "This function requires a PJSIP channel.\n");
+ return -1;
+ }
+
+ if (ast_strlen_zero(args.header_pattern)) {
+ ast_log(AST_LOG_ERROR, "This function requires a pattern.\n");
+ return -1;
+ }
+
+ header_data.channel = channel;
+ header_data.header_name = args.header_pattern;
+ header_data.header_value = NULL;
+ header_data.buf = buf;
+ header_data.len = len;
+ header_data.header_datastore = &response_header_datastore;
+
+ return ast_sip_push_task_wait_serializer(channel->session->serializer, read_headers, &header_data);
+
+}
+
+/*!
+ * \brief Implements PJSIP_HEADER function 'read' callback.
*
* Valid actions are 'read' and 'remove'.
*/
@@ -645,6 +803,7 @@
header_data.header_value = NULL;
header_data.buf = buf;
header_data.len = len;
+ header_data.header_datastore = &header_datastore;
if (!strcasecmp(args.action, "read")) {
return ast_sip_push_task_wait_serializer(channel->session->serializer, read_header, &header_data);
@@ -660,7 +819,62 @@
}
/*!
- * \brief Implements function 'write' callback.
+ * \brief Implements PJSIP_RESPONSE_HEADER function 'read' callback.
+ *
+ * Valid actions are 'read'
+ */
+static int func_response_read_header(struct ast_channel *chan, const char *function, char *data, char *buf, size_t len)
+{
+ struct ast_sip_channel_pvt *channel = chan ? ast_channel_tech_pvt(chan) : NULL;
+ struct header_data header_data;
+ int number;
+ AST_DECLARE_APP_ARGS(args,
+ AST_APP_ARG(action);
+ AST_APP_ARG(header_name); AST_APP_ARG(header_number););
+ AST_STANDARD_APP_ARGS(args, data);
+
+ if (!channel || strncmp(ast_channel_name(chan), "PJSIP/", 6)) {
+ ast_log(LOG_ERROR, "This function requires a PJSIP channel.\n");
+ return -1;
+ }
+
+ if (ast_strlen_zero(args.action)) {
+ ast_log(AST_LOG_ERROR, "This function requires an action.\n");
+ return -1;
+ }
+ if (ast_strlen_zero(args.header_name)) {
+ ast_log(AST_LOG_ERROR, "This function requires a header name.\n");
+ return -1;
+ }
+ if (!args.header_number) {
+ number = 1;
+ } else {
+ sscanf(args.header_number, "%30d", &number);
+ if (number < 1) {
+ number = 1;
+ }
+ }
+
+ header_data.channel = channel;
+ header_data.header_name = args.header_name;
+ header_data.header_number = number;
+ header_data.header_value = NULL;
+ header_data.buf = buf;
+ header_data.len = len;
+ header_data.header_datastore = &response_header_datastore;
+
+ if (!strcasecmp(args.action, "read")) {
+ return ast_sip_push_task_wait_serializer(channel->session->serializer, read_header, &header_data);
+ } else {
+ ast_log(AST_LOG_ERROR,
+ "Unknown action '%s' is not valid, must be 'read'.\n",
+ args.action);
+ return -1;
+ }
+}
+
+/*!
+ * \brief Implements PJSIP_HEADER function 'write' callback.
*
* Valid actions are 'add', 'update' and 'remove'.
*/
@@ -703,6 +917,7 @@
header_data.header_value = value;
header_data.buf = NULL;
header_data.len = 0;
+ header_data.header_datastore = &header_datastore;
if (!strcasecmp(args.action, "add")) {
return ast_sip_push_task_wait_serializer(channel->session->serializer,
@@ -732,6 +947,16 @@
.read = func_read_headers
};
+static struct ast_custom_function pjsip_response_header_function = {
+ .name = "PJSIP_RESPONSE_HEADER",
+ .read = func_response_read_header
+};
+
+static struct ast_custom_function pjsip_response_headers_function = {
+ .name = "PJSIP_RESPONSE_HEADERS",
+ .read = func_response_read_headers
+};
+
/*!
* \internal
* \brief Session supplement callback for outgoing INVITE requests
@@ -768,6 +993,7 @@
.priority = AST_SIP_SUPPLEMENT_PRIORITY_CHANNEL - 1000,
.incoming_request = incoming_request,
.outgoing_request = outgoing_request,
+ .incoming_response = incoming_response,
};
static int load_module(void)
@@ -775,6 +1001,8 @@
ast_sip_session_register_supplement(&header_funcs_supplement);
ast_custom_function_register(&pjsip_header_function);
ast_custom_function_register(&pjsip_headers_function);
+ ast_custom_function_register(&pjsip_response_header_function);
+ ast_custom_function_register(&pjsip_response_headers_function);
return AST_MODULE_LOAD_SUCCESS;
}
@@ -783,6 +1011,8 @@
{
ast_custom_function_unregister(&pjsip_header_function);
ast_custom_function_unregister(&pjsip_headers_function);
+ ast_custom_function_unregister(&pjsip_response_header_function);
+ ast_custom_function_unregister(&pjsip_response_headers_function);
ast_sip_session_unregister_supplement(&header_funcs_supplement);
return 0;
}
--
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Gerrit-Project: asterisk
Gerrit-Branch: 16
Gerrit-Change-Id: I264a610a9333359297a0825feb29a1bb4f4ad144
Gerrit-Change-Number: 18736
Gerrit-PatchSet: 1
Gerrit-Owner: José Lopes <jose.lopes at nfon.com>
Gerrit-MessageType: newchange
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