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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2013, Digium, Inc.
*
* 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.
*/
/*!
* \file
* \brief sip_route functions
*/
/*** MODULEINFO
<support_level>extended</support_level>
***/
#include "asterisk.h"
#include "asterisk/utils.h"
#include "include/route.h"
#include "include/reqresp_parser.h"
/*!
* \brief Traverse route hops
*/
#define sip_route_traverse(route,elem) AST_LIST_TRAVERSE(&(route)->list, elem, list)
#define sip_route_first(route) AST_LIST_FIRST(&(route)->list)
/*!
* \brief Structure to save a route hop
*/
struct sip_route_hop {
AST_LIST_ENTRY(sip_route_hop) list;
char uri[0];
};
const char *sip_route_add(struct sip_route *route, const char *uri, size_t len, int inserthead)
{
struct sip_route_hop *hop;
if (!uri || len < 1 || uri[0] == '\0') {
return NULL;
}
/* Expand len to include null terminator */
len++;
/* ast_calloc is not needed because all fields are initialized in this block */
hop = ast_malloc(sizeof(struct sip_route_hop) + len);
if (!hop) {
return NULL;
}
ast_copy_string(hop->uri, uri, len);
if (inserthead) {
AST_LIST_INSERT_HEAD(&route->list, hop, list);
route->type = route_invalidated;
} else {
if (sip_route_empty(route)) {
route->type = route_invalidated;
}
AST_LIST_INSERT_TAIL(&route->list, hop, list);
hop->list.next = NULL;
}
return hop->uri;
}
void sip_route_process_header(struct sip_route *route, const char *header, int inserthead)
{
const char *hop;
int len = 0;
const char *uri;
if (!route) {
ast_log(LOG_ERROR, "sip_route_process_header requires non-null route");
ast_do_crash();
return;
}
while (!get_in_brackets_const(header, &uri, &len)) {
header = strchr(header, ',');
if (header >= uri && header <= (uri + len)) {
/* comma inside brackets */
const char *next_br = strchr(header, '<');
if (next_br && next_br <= (uri + len)) {
header++;
continue;
}
continue;
}
if ((hop = sip_route_add(route, uri, len, inserthead))) {
ast_debug(2, "sip_route_process_header: <%s>\n", hop);
}
header = strchr(uri + len + 1, ',');
if (header == NULL) {
/* No more field-values, we're done with this header */
break;
}
/* Advance past comma */
header++;
}
}
void sip_route_copy(struct sip_route *dst, const struct sip_route *src)
{
struct sip_route_hop *hop;
/* make sure dst is empty */
sip_route_clear(dst);
sip_route_traverse(src, hop) {
const char *uri = sip_route_add(dst, hop->uri, strlen(hop->uri), 0);
if (uri) {
ast_debug(2, "sip_route_copy: copied hop: <%s>\n", uri);
}
}
dst->type = src->type;
}
void sip_route_clear(struct sip_route *route)
{
struct sip_route_hop *hop;
while ((hop = AST_LIST_REMOVE_HEAD(&route->list, list))) {
ast_free(hop);
}
route->type = route_loose;
}
void sip_route_dump(const struct sip_route *route)
{
if (sip_route_empty(route)) {
ast_verbose("sip_route_dump: no route/path\n");
} else {
struct sip_route_hop *hop;
sip_route_traverse(route, hop) {
ast_verbose("sip_route_dump: route/path hop: <%s>\n", hop->uri);
}
}
}
struct ast_str *sip_route_list(const struct sip_route *route, int formatcli, int skip)
{
struct sip_route_hop *hop;
const char *comma;
struct ast_str *buf;
int i = 0 - skip;
buf = ast_str_create(64);
if (!buf) {
return NULL;
}
comma = formatcli ? ", " : ",";
sip_route_traverse(route, hop) {
if (i >= 0) {
ast_str_append(&buf, 0, "%s<%s>", i ? comma : "", hop->uri);
}
i++;
}
if (formatcli && i <= 0) {
ast_str_append(&buf, 0, "N/A");
}
return buf;
}
int sip_route_is_strict(struct sip_route *route)
{
if (!route) {
return 0;
}
if (route->type == route_invalidated) {
struct sip_route_hop *hop = sip_route_first(route);
int ret = hop && (strstr(hop->uri, ";lr") == NULL);
route->type = ret ? route_strict : route_loose;
return ret;
}
return (route->type == route_strict) ? 1 : 0;
}
const char *sip_route_first_uri(const struct sip_route *route)
{
struct sip_route_hop *hop = sip_route_first(route);
return hop ? hop->uri : NULL;
}
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