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/*
* $Id: diversion.c,v 1.5 2006/01/24 20:56:24 bogdan_iancu Exp $
*
* Diversion Header Field Support
*
* Copyright (C) 2004 FhG Fokus
*
* This file is part of openser, a free SIP server.
*
* openser is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* openser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdio.h>
#include <string.h>
#include "../../sr_module.h"
#include "../../error.h"
#include "../../dprint.h"
#include "../../mem/mem.h"
#include "../../data_lump.h"
MODULE_VERSION
#define DIVERSION_HF "Diversion"
#define DIVERSION_HF_LEN (sizeof(DIVERSION_HF) - 1)
#define DIVERSION_PREFIX DIVERSION_HF ": <"
#define DIVERSION_PREFIX_LEN (sizeof(DIVERSION_PREFIX) - 1)
#define DIVERSION_SUFFIX ">;reason="
#define DIVERSION_SUFFIX_LEN (sizeof(DIVERSION_SUFFIX) - 1)
str suffix = {"", 0};
int add_diversion(struct sip_msg* msg, char* r, char* s);
static int str_fixup(void** param, int param_no);
/*
* Module initialization function prototype
*/
static int mod_init(void);
/*
* Exported functions
*/
static cmd_export_t cmds[] = {
{"add_diversion", add_diversion, 1, str_fixup, REQUEST_ROUTE | FAILURE_ROUTE},
{0, 0, 0, 0, 0}
};
/*
* Exported parameters
*/
static param_export_t params[] = {
{"suffix", STR_PARAM, &suffix.s},
{0, 0, 0}
};
/*
* Module interface
*/
struct module_exports exports = {
"diversion",
cmds, /* Exported functions */
params, /* Exported parameters */
0, /* exported statistics */
mod_init, /* module initialization function */
0, /* response function */
0, /* destroy function */
0 /* child initialization function */
};
static int mod_init(void)
{
suffix.len = strlen(suffix.s);
return 0;
}
/*
* Convert char* parameter to str* parameter
*/
static int str_fixup(void** param, int param_no)
{
str* s;
if (param_no == 1 || param_no == 2) {
s = (str*)pkg_malloc(sizeof(str));
if (!s) {
LOG(L_ERR, "str_fixup: No memory left\n");
return E_UNSPEC;
}
s->s = (char*)*param;
s->len = strlen(s->s);
*param = (void*)s;
}
return 0;
}
static inline int add_diversion_helper(struct sip_msg* msg, str* s)
{
char *ptr;
static struct lump* anchor = 0;
static int msg_id = 0;
if (msg_id != msg->id) {
msg_id = msg->id;
anchor = 0;
}
if (!msg->diversion && parse_headers(msg, HDR_DIVERSION_F, 0) == -1) {
LOG(L_ERR, "add_diversion_helper: Header parsing failed\n");
return -1;
}
if (msg->diversion) {
/* Insert just before the topmost Diversion header */
ptr = msg->diversion->name.s;
} else {
/* Insert at the end */
ptr = msg->unparsed;
}
if (!anchor) {
anchor = anchor_lump(msg, ptr - msg->buf, 0, 0);
if (!anchor) {
LOG(L_ERR, "add_diversion_helper: Can't get anchor\n");
return -2;
}
}
if (!insert_new_lump_before(anchor, s->s, s->len, 0)) {
LOG(L_ERR, "add_diversion_helper: Can't insert lump\n");
return -3;
}
return 0;
}
int add_diversion(struct sip_msg* msg, char* r, char* s)
{
str div_hf;
char *at;
str* uri;
str* reason;
reason = (str*)r;
uri = &msg->first_line.u.request.uri;
div_hf.len = DIVERSION_PREFIX_LEN + uri->len + DIVERSION_SUFFIX_LEN + reason->len + CRLF_LEN;
div_hf.s = pkg_malloc(div_hf.len);
if (!div_hf.s) {
LOG(L_ERR, "add_diversion: No memory left\n");
return -1;
}
at = div_hf.s;
memcpy(at, DIVERSION_PREFIX, DIVERSION_PREFIX_LEN);
at += DIVERSION_PREFIX_LEN;
memcpy(at, uri->s, uri->len);
at += uri->len;
memcpy(at, DIVERSION_SUFFIX, DIVERSION_SUFFIX_LEN);
at += DIVERSION_SUFFIX_LEN;
memcpy(at, reason->s, reason->len);
at += reason->len;
memcpy(at, CRLF, CRLF_LEN);
if (add_diversion_helper(msg, &div_hf) < 0) {
pkg_free(div_hf.s);
return -1;
}
return 1;
}
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