kamailio/modules/textopsx/textopsx.c

/**
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of ser, a free SIP server.
 *
 * ser 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
 *
 * For a license to use the ser software under conditions
 * other than those described here, or to purchase support for this
 * software, please contact iptel.org by e-mail at the following addresses:
 *    info@iptel.org
 *
 * ser 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 <stdlib.h>
#include <string.h>

#include "../../sr_module.h"
#include "../../dprint.h"
#include "../../data_lump.h"
#include "../../msg_translator.h"


MODULE_VERSION

static int msg_apply_changes_f(sip_msg_t *msg, char *str1, char *str2);

static int change_reply_status_f(struct sip_msg*, char*, char *);
static int change_reply_status_fixup(void** param, int param_no);

/* cfg functions */
static cmd_export_t cmds[] = {
	{"msg_apply_changes",    (cmd_function)msg_apply_changes_f,     0,
		0, REQUEST_ROUTE },
	{"change_reply_status",	 change_reply_status_f,	                2,
		change_reply_status_fixup, ONREPLY_ROUTE },

	{0,0,0,0,0}
};

/* module exports structure */
struct module_exports exports= {
	"textopsx",
	cmds, /* cfg functions */
	0, /* RPC methods */
	0, /* cfg parameters */
	0, /* initialization function */
	0, /* response function */
	0, /* destroy function */
	0, /* on_cancel function */
	0  /* per-child init function */
};


/**
 *
 */
static int msg_apply_changes_f(sip_msg_t *msg, char *str1, char *str2)
{
	struct dest_info dst;
	str obuf;
	sip_msg_t tmp;

	if(get_route_type()!=REQUEST_ROUTE)
	{
		LM_ERR("invalid usage - not in request route\n");
		return -1;
	}

	init_dest_info(&dst);
	dst.proto = PROTO_UDP;
	obuf.s = build_req_buf_from_sip_req(msg,
			(unsigned int*)&obuf.len, &dst,
			BUILD_NO_LOCAL_VIA|BUILD_NO_VIA1_UPDATE);
	if(obuf.s == NULL)
	{
		LM_ERR("couldn't update msg buffer content\n");
		return -1;
	}
	if(obuf.len>=BUF_SIZE)
	{
		LM_ERR("new buffer overflow (%d)\n", obuf.len);
		pkg_free(obuf.s);
		return -1;
	}
	/* temporary copy */
	memcpy(&tmp, msg, sizeof(sip_msg_t));

	/* reset dst uri and path vector to avoid freeing - restored later */
	if(msg->dst_uri.s!=NULL)
	{
		msg->dst_uri.s = NULL;
		msg->dst_uri.len = 0;
	}
	if(msg->path_vec.s!=NULL)
	{
		msg->path_vec.s = NULL;
		msg->path_vec.len = 0;
	}

	/* free old msg structure */
	free_sip_msg(msg);
	memset(msg, 0, sizeof(sip_msg_t));

	/* restore msg fields */
	msg->buf                = tmp.buf;
	msg->id                 = tmp.id;
	msg->rcv                = tmp.rcv;
	msg->set_global_address = tmp.set_global_address;
	msg->set_global_port    = tmp.set_global_port;
	msg->flags              = tmp.flags;
	msg->msg_flags          = tmp.msg_flags;
	msg->force_send_socket  = tmp.force_send_socket;
	msg->fwd_send_flags     = tmp.fwd_send_flags;
	msg->rpl_send_flags     = tmp.rpl_send_flags;
	msg->dst_uri            = tmp.dst_uri;
	msg->path_vec           = tmp.path_vec;

	memcpy(msg->buf, obuf.s, obuf.len);
	msg->len = obuf.len;
	msg->buf[msg->len] = '\0';

	/* free new buffer - copied in the static buffer from old sip_msg_t */
	pkg_free(obuf.s);

	/* reparse the message */
	LM_DBG("SIP Request content updated - reparsing\n");
	if (parse_msg(msg->buf, msg->len, msg)!=0){
		LM_ERR("parse_msg failed\n");
		return -1;
	}

	return 1;
}


/**
 *
 */
static int change_reply_status_fixup(void** param, int param_no)
{
	if (param_no == 1) {
		return fixup_var_int_12(param, param_no);
	} else if (param_no == 2)
		return fixup_var_pve_str_12(param, param_no);
	else
		return 0;
}

/**
 *
 */
static int change_reply_status_f(struct sip_msg* msg, char* _code, char* _reason)
{
	int	code;
	str	reason;
	struct lump	*l;
	char	*ch;

	if (get_int_fparam(&code, msg, (fparam_t*)_code)
		|| get_str_fparam(&reason, msg, (fparam_t*)_reason)
		|| (reason.len == 0)
	) {
		LOG(L_ERR, "ERROR: textops: cannot get parameter\n");
		return -1;
	}

	if ((code < 100) || (code > 699)) {
		LOG(L_ERR, "ERROR: textops: wrong status code: %d\n",
				code);
		return -1;
	}

	if (((code < 300) || (msg->REPLY_STATUS < 300))
		&& (code/100 != msg->REPLY_STATUS/100)
	) {
		LOG(L_ERR, "ERROR: textops: the class of provisional or "
			"positive final replies cannot be changed\n");
		return -1;
	}

	/* rewrite the status code directly in the message buffer */
	msg->first_line.u.reply.statuscode = code;
	msg->first_line.u.reply.status.s[2] = code % 10 + '0'; code /= 10;
	msg->first_line.u.reply.status.s[1] = code % 10 + '0'; code /= 10;
	msg->first_line.u.reply.status.s[0] = code + '0';

	l = del_lump(msg,
		msg->first_line.u.reply.reason.s - msg->buf,
		msg->first_line.u.reply.reason.len,
		0);
	if (!l) {
		LOG(L_ERR, "ERROR: textops(): Failed to add del lump\n");
		return -1;
	}
	/* clone the reason phrase, the lumps need to be pkg allocated */
	ch = (char *)pkg_malloc(reason.len);
	if (!ch) {
		LOG(L_ERR, "ERROR: textops: Not enough memory\n");
		return -1;
	}
	memcpy(ch, reason.s, reason.len);
	if (insert_new_lump_after(l, ch, reason.len, 0)==0){
		LOG(L_ERR, "ERROR: textops: failed to add new lump: %.*s\n",
			reason.len, ch);
		pkg_free(ch);
		return -1;
	}

	return 1;
}