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xhttp_mod.c
521 lines (463 loc) · 11.2 KB
/
xhttp_mod.c
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/*
* Copyright (C) 2010 Daniel-Constantin Mierla (asipto.com)
*
* This file is part of Kamailio, a free SIP server.
*
* Kamailio 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
*
* Kamailio 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "../../core/sr_module.h"
#include "../../core/error.h"
#include "../../core/mem/mem.h"
#include "../../core/ut.h"
#include "../../core/dset.h"
#include "../../core/dprint.h"
#include "../../core/data_lump.h"
#include "../../core/data_lump_rpl.h"
#include "../../core/receive.h"
#include "../../core/msg_translator.h"
#include "../../modules/sl/sl.h"
#include "../../core/nonsip_hooks.h"
#include "../../core/action.h"
#include "../../core/script_cb.h"
#include "../../core/route.h"
#include "../../core/sip_msg_clone.h"
#include "../../core/mod_fix.h"
#include "../../core/pvar.h"
#include "api.h"
#include "xhttp_trans.h"
MODULE_VERSION
static int xhttp_handler(sip_msg_t* msg);
static int w_xhttp_send_reply(sip_msg_t* msg, char* pcode, char* preason,
char *pctype, char* pbody);
static int mod_init(void);
static int fixup_xhttp_reply(void** param, int param_no);
static int pv_get_huri(struct sip_msg *msg, pv_param_t *param,
pv_value_t *res);
static int xhttp_route_no=DEFAULT_RT;
static char* xhttp_url_match = NULL;
static regex_t xhttp_url_match_regexp;
static char* xhttp_url_skip = NULL;
static regex_t xhttp_url_skip_regexp;
/** SL API structure */
sl_api_t slb;
static cmd_export_t cmds[] = {
{"xhttp_reply", (cmd_function)w_xhttp_send_reply,
4, fixup_xhttp_reply, 0, REQUEST_ROUTE},
{"bind_xhttp", (cmd_function)bind_xhttp,
0, 0, 0, ANY_ROUTE},
{0, 0, 0, 0, 0}
};
static pv_export_t mod_pvs[] = {
{{"hu", (sizeof("hu")-1)}, /* */
PVT_OTHER, pv_get_huri, 0,
0, 0, 0, 0},
{ {0, 0}, 0, 0, 0, 0, 0, 0, 0 }
};
static param_export_t params[] = {
{"url_match", PARAM_STRING, &xhttp_url_match},
{"url_skip", PARAM_STRING, &xhttp_url_skip},
{0, 0, 0}
};
/** module exports */
struct module_exports exports= {
"xhttp",
DEFAULT_DLFLAGS, /* dlopen flags */
cmds,
params,
0, /* exported statistics */
0 , /* exported MI functions */
mod_pvs, /* exported pseudo-variables */
0, /* extra processes */
mod_init, /* module initialization function */
0,
0,
0 /* per-child init function */
};
static tr_export_t mod_trans[] = {
{ {"url", sizeof("url")-1},
xhttp_tr_parse_url },
{ { 0, 0 }, 0 }
};
/**
*
*/
static int mod_init(void)
{
struct nonsip_hook nsh;
int route_no;
route_no=route_get(&event_rt, "xhttp:request");
if (route_no==-1)
{
LM_ERR("failed to find event_route[xhttp:request]\n");
return -1;
}
if (event_rt.rlist[route_no]==0)
{
LM_WARN("event_route[xhttp:request] is empty\n");
}
xhttp_route_no=route_no;
/* bind the SL API */
if (sl_load_api(&slb)!=0) {
LM_ERR("cannot bind to SL API\n");
return -1;
}
/* register non-sip hooks */
memset(&nsh, 0, sizeof(nsh));
nsh.name = "xhttp";
nsh.destroy = 0;
nsh.on_nonsip_req = xhttp_handler;
if (register_nonsip_msg_hook(&nsh)<0)
{
LM_ERR("Failed to register non sip msg hooks\n");
return -1;
}
if(xhttp_url_match!=NULL)
{
memset(&xhttp_url_match_regexp, 0, sizeof(regex_t));
if (regcomp(&xhttp_url_match_regexp, xhttp_url_match, REG_EXTENDED)!=0) {
LM_ERR("bad match re %s\n", xhttp_url_match);
return E_BAD_RE;
}
}
if(xhttp_url_skip!=NULL)
{
memset(&xhttp_url_skip_regexp, 0, sizeof(regex_t));
if (regcomp(&xhttp_url_skip_regexp, xhttp_url_skip, REG_EXTENDED)!=0) {
LM_ERR("bad skip re %s\n", xhttp_url_skip);
return E_BAD_RE;
}
}
return 0;
}
int mod_register(char *path, int *dlflags, void *p1, void *p2)
{
return register_trans_mod(path, mod_trans);
}
/**
*
*/
static int pv_get_huri(struct sip_msg *msg, pv_param_t *param,
pv_value_t *res)
{
if(msg==NULL || res==NULL)
return -1;
return pv_get_strval(msg, param, res, &msg->first_line.u.request.uri);
}
/**
*
*/
static char* xhttp_to_sip(sip_msg_t* msg, int* new_msg_len)
{
unsigned int len, via_len;
char* via, *new_msg, *p;
str ip, port;
struct hostport hp;
struct dest_info dst;
ip.s = ip_addr2strz(&msg->rcv.src_ip);
ip.len = strlen(ip.s);
port.s = int2str(msg->rcv.src_port, &port.len);
hp.host = &ip;
hp.port = &port;
init_dst_from_rcv(&dst, &msg->rcv);
via = via_builder(&via_len, &dst, 0, 0, &hp);
if (via == 0)
{
LM_DBG("failed to build via\n");
return 0;
}
len = via_len + msg->len;
p = new_msg = pkg_malloc(len + 1);
if (new_msg == 0)
{
LM_DBG("memory allocation failure (%d bytes)\n", len);
pkg_free(via);
return 0;
}
/* new message:
* <orig first line>
* Via: <faked via>
* <orig http message w/o the first line>
*/
memcpy(p, msg->first_line.u.request.method.s,
msg->first_line.len);
p += msg->first_line.len;
memcpy(p, via, via_len);
p += via_len;
memcpy(p, SIP_MSG_START(msg) + msg->first_line.len,
msg->len - msg->first_line.len);
new_msg[len] = 0;
pkg_free(via);
*new_msg_len = len;
return new_msg;
}
/**
*
*/
static int xhttp_process_request(sip_msg_t* orig_msg,
char* new_buf, unsigned int new_len)
{
int ret;
sip_msg_t tmp_msg, *msg;
struct run_act_ctx ra_ctx;
ret=0;
if (new_buf && new_len)
{
memset(&tmp_msg, 0, sizeof(sip_msg_t));
tmp_msg.buf = new_buf;
tmp_msg.len = new_len;
tmp_msg.rcv = orig_msg->rcv;
tmp_msg.id = orig_msg->id;
tmp_msg.set_global_address = orig_msg->set_global_address;
tmp_msg.set_global_port = orig_msg->set_global_port;
if (parse_msg(new_buf, new_len, &tmp_msg) != 0)
{
LM_ERR("parse_msg failed\n");
goto error;
}
msg = &tmp_msg;
} else {
msg = orig_msg;
}
if ((msg->first_line.type != SIP_REQUEST) || (msg->via1 == 0) ||
(msg->via1->error != PARSE_OK))
{
LM_CRIT("strange message: %.*s\n", msg->len, msg->buf);
goto error;
}
if (exec_pre_script_cb(msg, REQUEST_CB_TYPE) == 0)
{
goto done;
}
init_run_actions_ctx(&ra_ctx);
if (run_actions(&ra_ctx, event_rt.rlist[xhttp_route_no], msg) < 0)
{
ret=-1;
LM_DBG("error while trying script\n");
goto done;
}
done:
exec_post_script_cb(msg, REQUEST_CB_TYPE);
if (msg != orig_msg)
{
free_sip_msg(msg);
}
return ret;
error:
return -1;
}
/**
*
*/
static int xhttp_handler(sip_msg_t* msg)
{
int ret;
char* fake_msg;
int fake_msg_len;
regmatch_t pmatch;
char c;
ret=NONSIP_MSG_DROP;
if(!IS_HTTP(msg))
{
/* oly http msg type */
return NONSIP_MSG_PASS;
}
if(xhttp_url_skip!=NULL || xhttp_url_match!=NULL)
{
c = msg->first_line.u.request.uri.s[msg->first_line.u.request.uri.len];
msg->first_line.u.request.uri.s[msg->first_line.u.request.uri.len]
= '\0';
if (xhttp_url_skip!=NULL &&
regexec(&xhttp_url_skip_regexp, msg->first_line.u.request.uri.s,
1, &pmatch, 0)==0)
{
LM_DBG("URL matched skip re\n");
msg->first_line.u.request.uri.s[msg->first_line.u.request.uri.len]
= c;
return NONSIP_MSG_PASS;
}
if (xhttp_url_match!=NULL &&
regexec(&xhttp_url_match_regexp, msg->first_line.u.request.uri.s,
1, &pmatch, 0)!=0)
{
LM_DBG("URL not matched\n");
msg->first_line.u.request.uri.s[msg->first_line.u.request.uri.len]
= c;
return NONSIP_MSG_PASS;
}
msg->first_line.u.request.uri.s[msg->first_line.u.request.uri.len] = c;
}
if (msg->via1 == 0)
{
fake_msg = xhttp_to_sip(msg, &fake_msg_len);
if (fake_msg == 0)
{
LM_ERR("out of memory\n");
ret=NONSIP_MSG_ERROR;
} else {
DBG("new fake msg created (%d bytes):\n<%.*s>\n",
fake_msg_len, fake_msg_len, fake_msg);
if (xhttp_process_request(msg, fake_msg, fake_msg_len)<0) {
ret=NONSIP_MSG_ERROR;
}
pkg_free(fake_msg);
}
return ret;
} else {
LM_DBG("http msg unchanged (%d bytes):\n<%.*s>\n",
msg->len, msg->len, msg->buf);
if (xhttp_process_request(msg, 0, 0)<0)
ret=NONSIP_MSG_ERROR;
return ret;
}
}
/**
*
*/
static int xhttp_send_reply(sip_msg_t *msg, int code, str *reason,
str *ctype, str *body)
{
str tbuf;
if(ctype!=NULL && ctype->len>0)
{
/* add content-type */
tbuf.len=sizeof("Content-Type: ") - 1 + ctype->len + CRLF_LEN;
tbuf.s=pkg_malloc(sizeof(char)*(tbuf.len));
if (tbuf.s==0)
{
LM_ERR("out of pkg memory\n");
return -1;
}
memcpy(tbuf.s, "Content-Type: ", sizeof("Content-Type: ") - 1);
memcpy(tbuf.s+sizeof("Content-Type: ") - 1, ctype->s, ctype->len);
memcpy(tbuf.s+sizeof("Content-Type: ") - 1 + ctype->len,
CRLF, CRLF_LEN);
if (add_lump_rpl(msg, tbuf.s, tbuf.len, LUMP_RPL_HDR) == 0)
{
LM_ERR("failed to insert content-type lump\n");
pkg_free(tbuf.s);
return -1;
}
pkg_free(tbuf.s);
LM_DBG("response with content-type: %.*s\n", ctype->len, ctype->s);
}
if(body!=NULL && body->len>0)
{
if (add_lump_rpl(msg, body->s, body->len, LUMP_RPL_BODY) == 0)
{
LM_ERR("Error while adding reply lump\n");
return -1;
}
LM_DBG("response with body: %.*s\n", body->len, body->s);
}
LM_DBG("sending out response: %d %.*s\n", code, reason->len, reason->s);
if (slb.sreply(msg, code, reason) < 0)
{
LM_ERR("Error while sending reply\n");
return -1;
}
return 0;
}
/**
*
*/
static int w_xhttp_send_reply(sip_msg_t* msg, char* pcode, char* preason,
char *pctype, char* pbody)
{
str body = {0, 0};
str reason = {"OK", 2};
str ctype = {"text/plain", 10};
int code = 200;
if(pcode==0 || preason==0 || pctype==0 || pbody==0)
{
LM_ERR("invalid parameters\n");
return -1;
}
if(fixup_get_ivalue(msg, (gparam_p)pcode, &code)!=0)
{
LM_ERR("no reply code value\n");
return -1;
}
if(code<100 || code>700)
{
LM_ERR("invalid code parameter\n");
return -1;
}
if(fixup_get_svalue(msg, (gparam_p)preason, &reason)!=0)
{
LM_ERR("unable to get reason\n");
return -1;
}
if(reason.s==NULL || reason.len == 0)
{
LM_ERR("invalid reason parameter\n");
return -1;
}
if(fixup_get_svalue(msg, (gparam_p)pctype, &ctype)!=0)
{
LM_ERR("unable to get content type\n");
return -1;
}
if(ctype.s==NULL)
{
LM_ERR("invalid content-type parameter\n");
return -1;
}
if(fixup_get_svalue(msg, (gparam_p)pbody, &body)!=0)
{
LM_ERR("unable to get body\n");
return -1;
}
if(body.s==NULL)
{
LM_ERR("invalid body parameter\n");
return -1;
}
if(xhttp_send_reply(msg, code, &reason, &ctype, &body)<0)
return -1;
return 1;
}
/**
*
*/
static int fixup_xhttp_reply(void** param, int param_no)
{
if (param_no == 1) {
return fixup_igp_null(param, 1);
} else if (param_no == 2) {
return fixup_spve_null(param, 1);
} else if (param_no == 3) {
return fixup_spve_null(param, 1);
} else if (param_no == 4) {
return fixup_spve_null(param, 1);
}
return 0;
}
/**
*
*/
int bind_xhttp(xhttp_api_t* api)
{
if (!api) {
ERR("Invalid parameter value\n");
return -1;
}
api->reply = xhttp_send_reply;
return 0;
}
/** @} */