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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2013, Digium, Inc.
*
* Mark Michelson <mmichelson@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
#include "asterisk.h"
#include <pjsip.h>
#include <pjlib.h>
#include "asterisk/res_pjsip.h"
#include "asterisk/linkedlists.h"
#include "include/res_pjsip_private.h"
static pj_status_t add_request_headers(pjsip_tx_data *tdata);
static pj_status_t add_response_headers(pjsip_tx_data *tdata);
/*!
* \brief Indicator we've already handled a specific request/response
*
* PJSIP tends to reuse requests and responses. If we already have added
* headers to a request or response, we mark the message with this value
* so that we know not to re-add the headers again.
*/
static unsigned int handled_id = 0xCA115785;
static pjsip_module global_header_mod = {
.name = {"Global headers", 13},
.priority = PJSIP_MOD_PRIORITY_APPLICATION,
.on_tx_request = add_request_headers,
.on_tx_response = add_response_headers,
};
struct header {
AST_DECLARE_STRING_FIELDS(
AST_STRING_FIELD(name);
AST_STRING_FIELD(value);
);
AST_LIST_ENTRY(header) next;
};
static struct header *alloc_header(const char *name, const char *value)
{
struct header *alloc;
alloc = ast_calloc_with_stringfields(1, struct header, 32);
if (!alloc) {
return NULL;
}
ast_string_field_set(alloc, name, name);
ast_string_field_set(alloc, value, value);
return alloc;
}
static void destroy_header(struct header *to_destroy)
{
ast_string_field_free_memory(to_destroy);
ast_free(to_destroy);
}
AST_RWLIST_HEAD(header_list, header);
static struct header_list request_headers;
static struct header_list response_headers;
static void add_headers_to_message(struct header_list *headers, pjsip_tx_data *tdata)
{
struct header *iter;
SCOPED_LOCK(lock, headers, AST_RWLIST_RDLOCK, AST_RWLIST_UNLOCK);
if (tdata->mod_data[global_header_mod.id] == &handled_id) {
return;
}
AST_LIST_TRAVERSE(headers, iter, next) {
pj_str_t name;
pjsip_generic_string_hdr *hdr;
hdr = pjsip_msg_find_hdr_by_name(tdata->msg, pj_cstr(&name, iter->name), NULL);
if (hdr) {
continue;
}
ast_sip_add_header(tdata, iter->name, iter->value);
};
tdata->mod_data[global_header_mod.id] = &handled_id;
}
static pj_status_t add_request_headers(pjsip_tx_data *tdata)
{
add_headers_to_message(&request_headers, tdata);
return PJ_SUCCESS;
}
static pj_status_t add_response_headers(pjsip_tx_data *tdata)
{
add_headers_to_message(&response_headers, tdata);
return PJ_SUCCESS;
}
static void remove_header(struct header_list *headers, const char *to_remove)
{
struct header *iter;
AST_LIST_TRAVERSE_SAFE_BEGIN(headers, iter, next) {
if (!strcasecmp(iter->name, to_remove)) {
AST_LIST_REMOVE_CURRENT(next);
destroy_header(iter);
break;
}
}
AST_LIST_TRAVERSE_SAFE_END;
}
static int add_header(struct header_list *headers, const char *name, const char *value, int replace)
{
struct header *to_add = NULL;
if (!ast_strlen_zero(value)) {
to_add = alloc_header(name, value);
if (!to_add) {
return -1;
}
}
AST_RWLIST_WRLOCK(headers);
if (replace) {
remove_header(headers, name);
}
if (to_add) {
AST_LIST_INSERT_TAIL(headers, to_add, next);
}
AST_RWLIST_UNLOCK(headers);
return 0;
}
int ast_sip_add_global_request_header(const char *name, const char *value, int replace)
{
return add_header(&request_headers, name, value, replace);
}
int ast_sip_add_global_response_header(const char *name, const char *value, int replace)
{
return add_header(&response_headers, name, value, replace);
}
void ast_sip_initialize_global_headers(void)
{
AST_RWLIST_HEAD_INIT(&request_headers);
AST_RWLIST_HEAD_INIT(&response_headers);
internal_sip_register_service(&global_header_mod);
}
static void destroy_headers(struct header_list *headers)
{
struct header *iter;
while ((iter = AST_RWLIST_REMOVE_HEAD(headers, next))) {
destroy_header(iter);
}
AST_RWLIST_HEAD_DESTROY(headers);
}
void ast_sip_destroy_global_headers(void)
{
destroy_headers(&request_headers);
destroy_headers(&response_headers);
internal_sip_unregister_service(&global_header_mod);
}
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