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daemonize.c
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daemonize.c
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/*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of opensips, a free SIP server.
*
* opensips 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
*
* opensips 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
*
* History:
* --------
* 2004-02-20 removed from ser main.c into its own file (andrei)
* 2004-03-04 moved setuid/setgid in do_suid() (andrei)
* 2004-03-25 added increase_open_fds & set_core_dump (andrei)
* 2004-05-03 applied pgid patch from janakj
*/
/*!
* \file
* \brief Setup the OpenSIPS daemon prozess
*/
#include <sys/types.h>
#define _XOPEN_SOURCE /* needed on linux for the getpgid prototype, but
openbsd 3.2 won't include common types (uint a.s.o)
if defined before including sys/types.h */
#define _XOPEN_SOURCE_EXTENDED /* same as above */
#define __USE_XOPEN_EXTENDED /* same as above, overrides features.h */
#define __EXTENSIONS__ /* needed on solaris: if XOPEN_SOURCE is defined
struct timeval definition from <sys/time.h> won't
be included => workarround define _EXTENSIONS_ */
#include <signal.h>
#include <syslog.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/resource.h> /* setrlimit */
#include <unistd.h>
#ifdef __OS_linux
#include <sys/prctl.h>
#endif
#include "mem/shm_mem.h"
#include "daemonize.h"
#include "sr_module.h"
#include "globals.h"
#include "dprint.h"
#include "pt.h"
static int status_pipe[2];
static int *init_timer_no;
static enum opensips_states *osips_state = NULL;
/* creates the status pipe which will be used for
* proper status code returning
*
* must be called before any forking */
int create_status_pipe( int no_timers )
{
int rc;
status_pipe[0] = -1;
status_pipe[1] = -1;
retry:
rc = pipe(status_pipe);
if (rc < 0 && errno == EINTR)
goto retry;
LM_DBG("pipe created ? rc = %d, errno = %s\n",rc,strerror(errno));
if (no_timers)
return rc;
/* also create SHM var which the attendent will use
* to notify us about the overall number of timers
* that need init
*
* at this point we do not know how many timers we will need */
init_timer_no = shm_malloc(sizeof(int));
if (!init_timer_no) {
LM_ERR("no more shm\n");
return -1;
}
*init_timer_no = 0;
return rc;
}
void inc_init_timer(void)
{
LM_DBG("incrementing init timer no\n");
(*init_timer_no)++;
}
/* attempts to send the val
* status code to the waiting end */
int send_status_code(char val)
{
int rc;
retry:
rc = write(status_pipe[1], &val, 1);
if (rc < 0 && errno == EINTR)
goto retry;
LM_DBG("send %d ? rc = %d , errno=%s\n",val,rc,strerror(errno));
if (rc == 1)
return 0;
return -1;
}
/* blockingly waits on the pipe
* until a child sends a status code */
static int wait_status_code(char *code)
{
int rc;
if (status_pipe[0] == -1) {
LM_DBG("invalid read pipe\n");
goto error;
}
retry:
rc = read(status_pipe[0], code, 1);
if (rc < 0 && errno == EINTR)
goto retry;
LM_DBG("read code %d ? rc = %d, errno=%s\n",*code,rc,strerror(errno));
if (rc == 1)
return 0;
error:
*code = -1;
return -1;
}
int wait_for_one_child(void)
{
char rc;
if (wait_status_code(&rc)<0 || rc < 0)
return -1;
return 0;
}
int wait_for_all_children(void)
{
int procs_no,i,ret;
char rc;
clean_write_pipeend();
procs_no = count_init_child_processes();
for (i=0;i<procs_no;i++) {
ret = wait_status_code(&rc);
if (ret < 0 || rc < 0)
return -1;
}
/* we got this far, means everything went ok with
* SIP listeners and module procs
*
* still need to see if
* timers initialized ok */
for (i=0;i<*init_timer_no;i++) {
LM_DBG("waiting for timer\n");
ret = wait_status_code(&rc);
if (ret < 0 || rc < 0 )
return -1;
}
return 0;
}
/* cleans read pipe end
* for processes done reading */
void clean_read_pipeend(void)
{
if (status_pipe[0] != -1) {
close(status_pipe[0]);
status_pipe[0] = -1;
}
}
/* cleans write pipe end
* for processes done writing the status code
* MUST be called to ensure that the original
* parent process does not keep waiting forever */
void clean_write_pipeend(void)
{
if (status_pipe[1] != -1) {
close(status_pipe[1]);
status_pipe[1] = -1;
}
}
/*!
* \brief daemon init
* \param name daemon name
* \param own_pgid daemon process group
* \return return 0 on success, -1 on error
*/
int daemonize(char* name, int * own_pgid)
{
FILE *pid_stream = NULL;
pid_t pid;
int r, p,rc;
int pid_items;
p=-1;
/* flush std file descriptors to avoid flushes after fork
* (same message appearing multiple times)
* and switch to unbuffered
*/
setbuf(stdout, 0);
setbuf(stderr, 0);
if (chroot_dir&&(chroot(chroot_dir)<0)){
LM_CRIT("Cannot chroot to %s: %s\n", chroot_dir, strerror(errno));
goto error;
}
if (chdir(working_dir)<0){
LM_CRIT("Cannot chdir to %s: %s\n", working_dir, strerror(errno));
goto error;
}
if (!no_daemon_mode) {
/* fork to become!= group leader*/
if ((pid=fork())<0){
LM_CRIT("Cannot fork:%s\n", strerror(errno));
goto error;
}else if (pid!=0){
/* parent process => wait for status codes from children*/
clean_write_pipeend();
LM_DBG("waiting for status code from children\n");
rc = wait_for_all_children();
LM_INFO("pre-daemon process exiting with %d\n",rc);
exit(rc);
}
/* cleanup read end - nobody should
* need to read from status pipe from this point on */
clean_read_pipeend();
/* become session leader to drop the ctrl. terminal */
if (setsid()<0){
LM_WARN("setsid failed: %s\n",strerror(errno));
}else{
*own_pgid=1;/* we have our own process group */
}
/* fork again to drop group leadership */
if ((pid=fork())<0){
LM_CRIT("Cannot fork: %s\n", strerror(errno));
goto error;
}else if (pid!=0){
/*parent process => exit */
exit(0);
}
}
#ifdef __OS_linux
/* setsid may disables core dumping on linux, reenable it */
if ( !disable_core_dump && prctl(PR_SET_DUMPABLE, 1)) {
LM_ERR("Cannot enable core dumping after setuid\n");
}
#endif
/* added by noh: create a pid file for the main process */
if (pid_file!=0){
if ((pid_stream=fopen(pid_file, "r"))!=NULL){
pid_items=fscanf(pid_stream, "%d", &p);
fclose(pid_stream);
if (p==-1 || pid_items <= 0){
LM_WARN("pid file %s exists, but doesn't contain a valid"
" pid number, replacing...\n", pid_file);
} else
if (kill((pid_t)p, 0)==0 || errno==EPERM){
LM_CRIT("running process found in the pid file %s\n",
pid_file);
goto error;
}else{
LM_WARN("pid file contains old pid, replacing pid\n");
}
}
pid=getpid();
if ((pid_stream=fopen(pid_file, "w"))==NULL){
LM_ERR("unable to create pid file %s: %s\n",
pid_file, strerror(errno));
goto error;
}else{
r = fprintf(pid_stream, "%i\n", (int)pid);
fclose(pid_stream);
if (r<=0) {
LM_ERR("unable to write pid to file %s: %s\n",
pid_file, strerror(errno));
goto error;
}
}
}
if (pgid_file!=0){
if ((pid_stream=fopen(pgid_file, "r"))!=NULL){
pid_items=fscanf(pid_stream, "%d", &p);
fclose(pid_stream);
if (p==-1 || pid_items <= 0){
LM_WARN("pgid file %s exists, but doesn't contain a valid"
" pgid number, replacing...\n", pgid_file);
}
}
if (own_pgid){
pid=getpgid(0);
if ((pid_stream=fopen(pgid_file, "w"))==NULL){
LM_ERR("unable to create pgid file %s: %s\n",
pgid_file, strerror(errno));
goto error;
}else{
r = fprintf(pid_stream, "%i\n", (int)pid);
fclose(pid_stream);
if (r<=0) {
LM_ERR("unable to write pgid to file %s: %s\n",
pid_file, strerror(errno));
goto error;
}
}
}else{
LM_WARN("we don't have our own process so we won't save"
" our pgid\n");
unlink(pgid_file); /* just to be sure nobody will miss-use the old
value*/
}
}
/* try to replace stdin, stdout & stderr with /dev/null */
if (freopen("/dev/null", "r", stdin)==0){
LM_WARN("unable to replace stdin with /dev/null: %s\n",
strerror(errno));
/* continue, leave it open */
};
if (freopen("/dev/null", "w", stdout)==0){
LM_WARN("unable to replace stdout with /dev/null: %s\n",
strerror(errno));
/* continue, leave it open */
};
/* close stderr only if not to be used */
if ( (!log_stderr) && (freopen("/dev/null", "w", stderr)==0)){
LM_WARN("unable to replace stderr with /dev/null: %s\n",
strerror(errno));
/* continue, leave it open */
};
/* close any open file descriptors */
closelog();
/* 32 is the maximum number of inherited open file descriptors */
for (r=3; r < 32; r++){
/* future children must still inherit
* and write to this pipe end */
if (r != status_pipe[1])
close(r);
}
if (!log_stderr)
openlog(name, LOG_PID|LOG_CONS, log_facility);
/* LOG_CONS, LOG_PERRROR ? */
return 0;
error:
return -1;
}
/*!
* \brief set daemon user and group id
* \param uid user id
* \param gid group id
* \return return 0 on success, -1 on error
*/
int do_suid(const int uid, const int gid)
{
/* if running in debug mode, do not do anything about the PID file
* as they are not created (daemonize() is not used in debug mode) */
if (!debug_mode) {
if (pid_file) {
/* pid file should be already created by deamonize function
-> change the owner and group also
*/
if (chown( pid_file , uid?uid:-1, gid?gid:-1)!=0) {
LM_ERR("failed to change owner of pid file %s: %s(%d)\n",
pid_file, strerror(errno), errno);
goto error;
}
}
if (pgid_file) {
/* pgid file should be already created by deamonize function
-> change the owner and group also
*/
if (chown( pgid_file , uid?uid:-1, gid?gid:-1)!=0) {
LM_ERR("failed to change owner of pid file %s: %s(%d)\n",
pgid_file, strerror(errno), errno);
goto error;
}
}
}
if (gid){
if(setgid(gid)<0){
LM_CRIT("cannot change gid to %d: %s\n", gid, strerror(errno));
goto error;
}
}
if(uid){
if(setuid(uid)<0){
LM_CRIT("cannot change uid to %d: %s\n", uid, strerror(errno));
goto error;
}
}
#ifdef __OS_linux
/* setuid disables core dumping on linux, reenable it */
if ( !disable_core_dump && prctl(PR_SET_DUMPABLE, 1)) {
LM_ERR("Cannot enable core dumping after setuid\n");
}
#endif
return 0;
error:
return -1;
}
/*!
* \brief try to increase the open file limit to the value given by the global
* option "open_files_limit" ; the value is updated back in case of a
* partial increase of the limit
* \return return 0 on success, -1 on error
*/
int set_open_fds_limit(void)
{
struct rlimit lim, orig;
if (getrlimit(RLIMIT_NOFILE, &lim)<0){
LM_CRIT("cannot get the maximum number of file descriptors: %s\n",
strerror(errno));
goto error;
}
orig=lim;
LM_DBG("current open file limits: %lu/%lu\n",
(unsigned long)lim.rlim_cur, (unsigned long)lim.rlim_max);
if ((lim.rlim_cur==RLIM_INFINITY) || (open_files_limit<=lim.rlim_cur))
/* nothing to do (we do no reduce the limit) */
goto done;
if ((lim.rlim_max==RLIM_INFINITY) || (open_files_limit<=lim.rlim_max)) {
lim.rlim_cur=open_files_limit; /* increase soft limit to target */
} else {
/* more than the hard limit */
LM_INFO("trying to increase the open file limit"
" past the hard limit (%ld -> %d)\n",
(unsigned long)lim.rlim_max, open_files_limit);
lim.rlim_max=open_files_limit;
lim.rlim_cur=open_files_limit;
}
LM_DBG("increasing open file limits to: %lu/%lu\n",
(unsigned long)lim.rlim_cur, (unsigned long)lim.rlim_max);
if (setrlimit(RLIMIT_NOFILE, &lim)<0){
LM_CRIT("cannot increase the open file limit to"
" %lu/%lu: %s\n",
(unsigned long)lim.rlim_cur, (unsigned long)lim.rlim_max,
strerror(errno));
if (orig.rlim_max>orig.rlim_cur){
/* try to increase to previous maximum, better than not increasing
* at all */
lim.rlim_max=orig.rlim_max;
lim.rlim_cur=orig.rlim_max;
if (setrlimit(RLIMIT_NOFILE, &lim)==0){
LM_CRIT("maximum number of file descriptors increased to"
" %u\n",(unsigned)orig.rlim_max);
open_files_limit = orig.rlim_max;
goto done;
}
}
goto error;
}
done:
LM_DBG("open files limit set to %d\n",open_files_limit);
return 0;
error:
return -1;
}
/*!
* \brief enable or disable core dumps
* \param enable set to 1 to enable, to 0 to disable
* \param size core dump size
* \return return 0 on success, -1 on error
*/
int set_core_dump(int enable, unsigned int size)
{
struct rlimit lim, newlim;
if (enable){
if (getrlimit(RLIMIT_CORE, &lim)<0){
LM_CRIT("cannot get the maximum core size: %s\n",
strerror(errno));
goto error;
}
if (lim.rlim_cur<size){
/* first try max limits */
newlim.rlim_max=RLIM_INFINITY;
newlim.rlim_cur=newlim.rlim_max;
if (setrlimit(RLIMIT_CORE, &newlim)==0) goto done;
/* now try with size */
if (lim.rlim_max<size){
newlim.rlim_max=size;
}
newlim.rlim_cur=newlim.rlim_max;
if (setrlimit(RLIMIT_CORE, &newlim)==0) goto done;
/* if this failed too, try rlim_max, better than nothing */
newlim.rlim_max=lim.rlim_max;
newlim.rlim_cur=newlim.rlim_max;
if (setrlimit(RLIMIT_CORE, &newlim)<0){
LM_CRIT("could increase core limits at all: %s\n",
strerror (errno));
}else{
LM_CRIT("core limits increased only to %lu\n",
(unsigned long)lim.rlim_max);
}
goto error; /* it's an error we haven't got the size we wanted*/
} else {
/* using the same limit as before - disable uninitialized warning */
newlim.rlim_cur = lim.rlim_cur;
}
goto done; /*nothing to do */
}else{
/* disable */
newlim.rlim_cur=0;
newlim.rlim_max=0;
if (setrlimit(RLIMIT_CORE, &newlim)<0){
LM_CRIT("failed to disable core dumps: %s\n",
strerror(errno));
goto error;
}
}
done:
LM_DBG("core dump limits set to %lu\n", (unsigned long)newlim.rlim_cur);
return 0;
error:
return -1;
}
/* first setting must be done before any forking, so all processes will
* inherite the same pointer to the global state variable */
void set_osips_state(enum opensips_states state)
{
if (osips_state==NULL) {
osips_state = shm_malloc( sizeof(enum opensips_states) );
if (osips_state==NULL) {
LM_ERR("failed to allocate opensips state variable in shm\n");
return;
}
}
*osips_state = state;
}
enum opensips_states get_osips_state(void)
{
return osips_state ? *osips_state : STATE_NONE;
}