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exec.c
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exec.c
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/*
* Copyright (C) 2001-2003 FhG Fokus
*
* 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
*
*/
/*!
* \file
* \brief Exec module:: Module interface
* \ingroup exec
* Module: \ref exec
*/
/**
* @defgroup exec Execute external applications
* @brief Kamailio exec module
*
* The exec module allows external commands to be executed from a Kamailio script.
* The commands may be any valid shell commands--the command string is passed to the
* shell using “popen” command. Kamailio passes additional information about the request
* in environment variables.
*
*/
#include <stdio.h>
#include <strings.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
/*
#include <sys/resource.h>
*/
#include <sys/wait.h>
#include "../../mem/mem.h"
#include "../../error.h"
#include "../../config.h"
#include "../../parser/msg_parser.h"
#include "../../dprint.h"
#include "../../dset.h"
#include "../../action.h"
#include "../../usr_avp.h"
#include "exec.h"
int exec_msg(struct sip_msg *msg, char *cmd )
{
FILE *pipe;
int exit_status;
int ret;
ret=-1; /* pessimist: assume error */
pipe=popen( cmd, "w" );
if (pipe==NULL) {
LM_ERR("cannot open pipe: %s\n", cmd);
ser_error=E_EXEC;
return -1;
}
if (fwrite(msg->buf, 1, msg->len, pipe)!=msg->len) {
LM_ERR("failed to write to pipe\n");
ser_error=E_EXEC;
goto error01;
}
/* success */
ret=1;
error01:
if (ferror(pipe)) {
LM_ERR("pipe: %s\n", strerror(errno));
ser_error=E_EXEC;
ret=-1;
}
exit_status=pclose(pipe);
if (WIFEXITED(exit_status)) { /* exited properly .... */
/* return false if script exited with non-zero status */
if (WEXITSTATUS(exit_status)!=0) ret=-1;
} else { /* exited erroneously */
LM_ERR("cmd %s failed. exit_status=%d, errno=%d: %s\n",
cmd, exit_status, errno, strerror(errno) );
ret=-1;
}
return ret;
}
int exec_str(struct sip_msg *msg, char *cmd, char *param, int param_len) {
struct action act;
struct run_act_ctx ra_ctx;
int cmd_len;
FILE *pipe;
char *cmd_line;
int ret;
int l1;
static char uri_line[MAX_URI_SIZE+1];
int uri_cnt;
str uri;
int exit_status;
/* pessimist: assume error by default */
ret=-1;
l1=strlen(cmd);
if(param_len>0)
cmd_len=l1+param_len+4;
else
cmd_len=l1+1;
cmd_line=pkg_malloc(cmd_len);
if (cmd_line==0) {
ret=ser_error=E_OUT_OF_MEM;
LM_ERR("no pkg mem for command\n");
goto error00;
}
/* 'command parameter \0' */
memcpy(cmd_line, cmd, l1);
if(param_len>0)
{
cmd_line[l1]=' ';
cmd_line[l1+1]='\'';
memcpy(cmd_line+l1+2, param, param_len);
cmd_line[l1+param_len+2]='\'';
cmd_line[l1+param_len+3]=0;
} else {
cmd_line[l1] = 0;
}
pipe=popen( cmd_line, "r" );
if (pipe==NULL) {
LM_ERR("cannot open pipe: %s\n", cmd_line);
ser_error=E_EXEC;
goto error01;
}
/* read now line by line */
uri_cnt=0;
while( fgets(uri_line, MAX_URI_SIZE, pipe)!=NULL){
uri.s = uri_line;
uri.len=strlen(uri.s);
/* trim from right */
while(uri.len && (uri.s[uri.len-1]=='\r'
|| uri.s[uri.len-1]=='\n'
|| uri.s[uri.len-1]=='\t'
|| uri.s[uri.len-1]==' ' )) {
LM_DBG("rtrim\n");
uri.len--;
}
/* skip empty line */
if (uri.len==0) continue;
/* ZT */
uri.s[uri.len]=0;
if (uri_cnt==0) {
memset(&act, 0, sizeof(act));
act.type = SET_URI_T;
act.val[0].type = STRING_ST;
act.val[0].u.string = uri.s;
init_run_actions_ctx(&ra_ctx);
if (do_action(&ra_ctx, &act, msg)<0) {
LM_ERR("the action for has failed\n");
ser_error=E_OUT_OF_MEM;
goto error02;
}
} else {
if (append_branch(msg, &uri, 0, 0, Q_UNSPECIFIED, 0, 0,
0, 0, 0, 0) == -1) {
LM_ERR("append_branch failed; too many or too long URIs?\n");
goto error02;
}
}
uri_cnt++;
}
if (uri_cnt==0) {
LM_ERR("no uri from %s\n", cmd_line );
goto error02;
}
/* success */
ret=1;
error02:
if (ferror(pipe)) {
LM_ERR("in pipe: %s\n", strerror(errno));
ser_error=E_EXEC;
ret=-1;
}
exit_status=pclose(pipe);
if (WIFEXITED(exit_status)) { /* exited properly .... */
/* return false if script exited with non-zero status */
if (WEXITSTATUS(exit_status)!=0) ret=-1;
} else { /* exited erroneously */
LM_ERR("cmd %s failed. exit_status=%d, errno=%d: %s\n",
cmd, exit_status, errno, strerror(errno) );
ret=-1;
}
error01:
pkg_free(cmd_line);
error00:
return ret;
}
int exec_avp(struct sip_msg *msg, char *cmd, pvname_list_p avpl)
{
int_str avp_val;
int_str avp_name;
unsigned short avp_type;
FILE *pipe;
int ret;
char res_line[MAX_URI_SIZE+1];
str res;
int exit_status;
int i;
pvname_list_t* crt;
/* pessimist: assume error by default */
ret=-1;
pipe=popen( cmd, "r" );
if (pipe==NULL) {
LM_ERR("cannot open pipe: %s\n", cmd);
ser_error=E_EXEC;
return ret;
}
/* read now line by line */
i=0;
crt = avpl;
while( fgets(res_line, MAX_URI_SIZE, pipe)!=NULL){
res.s = res_line;
res.len=strlen(res.s);
/* trim from right */
while(res.len && (res.s[res.len-1]=='\r'
|| res.s[res.len-1]=='\n'
|| res.s[res.len-1]=='\t'
|| res.s[res.len-1]==' ' )) {
res.len--;
}
/* skip empty line */
if (res.len==0) continue;
/* ZT */
res.s[res.len]=0;
avp_type = 0;
if(crt==NULL)
{
avp_name.n = i+1;
} else {
if(pv_get_avp_name(msg, &(crt->sname.pvp), &avp_name, &avp_type)!=0)
{
LM_ERR("can't get item name [%d]\n",i);
goto error;
}
}
avp_type |= AVP_VAL_STR;
avp_val.s = res;
if(add_avp(avp_type, avp_name, avp_val)!=0)
{
LM_ERR("unable to add avp\n");
goto error;
}
if(crt)
crt = crt->next;
i++;
}
if (i==0)
LM_DBG("no result from %s\n", cmd);
/* success */
ret=1;
error:
if (ferror(pipe)) {
LM_ERR("pipe: %d/%s\n", errno, strerror(errno));
ser_error=E_EXEC;
ret=-1;
}
exit_status=pclose(pipe);
if (WIFEXITED(exit_status)) { /* exited properly .... */
/* return false if script exited with non-zero status */
if (WEXITSTATUS(exit_status)!=0) ret=-1;
} else { /* exited erroneously */
LM_ERR("cmd %s failed. exit_status=%d, errno=%d: %s\n",
cmd, exit_status, errno, strerror(errno) );
ret=-1;
}
return ret;
}