/**
* Main loop, forks the children, bind to addresses,
* handle signals.
* \return don't return on sucess, -1 on error
*/
static int main_loop(void)
{
static int chd_rank;
int i,rc;
pid_t pid;
struct socket_info* si;
int* startup_done = NULL;
stat_var *load_p = NULL;
chd_rank=0;
if (dont_fork) {
if (create_status_pipe() < 0) {
LM_ERR("failed to create status pipe");
goto error;
}
if (udp_listen==0) {
LM_ERR("no fork mode requires at least one"
" udp listen address, exiting...\n");
goto error;
}
/* only one address, we ignore all the others */
if (udp_init(udp_listen)==-1) goto error;
bind_address=udp_listen;
sendipv4=bind_address;
sendipv6=bind_address; /*FIXME*/
if (udp_listen->next) {
LM_WARN("using only the first listen address (no fork)\n");
}
/* try to drop privileges */
if (do_suid(uid, gid)==-1)
goto error;
if (start_module_procs()!=0) {
LM_ERR("failed to fork module processes\n");
goto error;
}
/* we need another process to act as the timer*/
if (start_timer_processes()!=0) {
LM_CRIT("cannot start timer process(es)\n");
goto error;
}
/* main process, receive loop */
set_proc_attrs("stand-alone SIP receiver %.*s",
bind_address->sock_str.len, bind_address->sock_str.s );
/* We will call child_init even if we
* do not fork - and it will be called with rank 1 because
* in fact we behave like a child, not like main process */
if (init_child(1) < 0) {
LM_ERR("init_child failed in don't fork\n");
goto error;
}
if (startup_rlist.a)
run_startup_route();
is_main=1;
if (register_udp_load_stat(&udp_listen->sock_str,
&pt[process_no].load)!=0) {
LM_ERR("failed to init udp load statistics\n");
goto error;
}
clean_write_pipeend();
LM_DBG("waiting for status code from children\n");
rc = wait_for_all_children();
if (rc < 0) {
LM_ERR("failed to succesfully init children\n");
return rc;
}
return udp_rcv_loop();
} else { /* don't fork */
for(si=udp_listen; si; si=si->next) {
/* create the listening socket (for each address)*/
/* udp */
if (udp_init(si)==-1) goto error;
/* get first ipv4/ipv6 socket*/
if ((si->address.af==AF_INET)&&
((sendipv4==0)||(sendipv4->flags&SI_IS_LO)))
sendipv4=si;
#ifdef USE_IPV6
if((sendipv6==0)&&(si->address.af==AF_INET6))
sendipv6=si;
#endif
}
#ifdef USE_TCP
if (!tcp_disable) {
for(si=tcp_listen; si; si=si->next) {
/* same thing for tcp */
if (tcp_init(si)==-1) goto error;
/* get first ipv4/ipv6 socket*/
if ((si->address.af==AF_INET)&
((sendipv4_tcp==0)||(sendipv4_tcp->flags&SI_IS_LO)))
sendipv4_tcp=si;
#ifdef USE_IPV6
if((sendipv6_tcp==0)&&(si->address.af==AF_INET6))
sendipv6_tcp=si;
#endif
}
}
#ifdef USE_TLS
if (!tls_disable) {
for(si=tls_listen; si; si=si->next) {
/* same as for tcp*/
if (tls_init(si)==-1) goto error;
/* get first ipv4/ipv6 socket*/
if ((si->address.af==AF_INET)&&
((sendipv4_tls==0)||(sendipv4_tls->flags&SI_IS_LO)))
sendipv4_tls=si;
#ifdef USE_IPV6
if((sendipv6_tls==0)&&(si->address.af==AF_INET6))
sendipv6_tls=si;
#endif
}
}
#endif /* USE_TLS */
#endif /* USE_TCP */
#ifdef USE_SCTP
if (!sctp_disable) {
for(si=sctp_listen; si; si=si->next) {
/* same thing for sctp */
if (sctp_server_init(si)==-1) goto error;
/* get first ipv4/ipv6 socket*/
if ((si->address.af==AF_INET)&&
((sendipv4_sctp==0)||(sendipv4_sctp->flags&SI_IS_LO)))
sendipv4_sctp=si;
#ifdef USE_IPV6
if((sendipv6_sctp==0)&&(si->address.af==AF_INET6))
sendipv6_sctp=si;
#endif
}
}
#endif /* USE_SCTP */
/* all processes should have access to all the sockets (for sending)
* so we open all first*/
if (do_suid(uid, gid)==-1) goto error; /* try to drop privileges */
if (start_module_procs()!=0) {
LM_ERR("failed to fork module processes\n");
goto error;
}
if(startup_rlist.a) {/* if a startup route was defined */
startup_done = (int*)shm_malloc(sizeof(int));
if(startup_done == NULL)
{
LM_ERR("No more shared memory\n");
goto error;
}
*startup_done = 0;
}
/* udp processes */
for(si=udp_listen; si; si=si->next) {
if (register_udp_load_stat(&si->sock_str, &load_p)!=0) {
LM_ERR("failed to init load statistics\n");
goto error;
}
for(i=0; i<children_no; i++) {
chd_rank++;
if ( (pid=internal_fork( "UDP receiver"))<0 ) {
LM_CRIT("cannot fork UDP process\n");
goto error;
} else {
if (pid==0) {
/* new UDP process */
/* set a more detailed description */
set_proc_attrs("SIP receiver %.*s ",
si->sock_str.len, si->sock_str.s);
bind_address=si; /* shortcut */
if (init_child(chd_rank) < 0) {
LM_ERR("init_child failed for UDP listener\n");
if (send_status_code(-1) < 0)
LM_ERR("failed to send status code\n");
clean_write_pipeend();
exit(-1);
}
if (send_status_code(0) < 0)
LM_ERR("failed to send status code\n");
clean_write_pipeend();
if(chd_rank == 1 && startup_rlist.a) {
if(run_startup_route()< 0) {
LM_ERR("Startup route processing failed\n");
exit(-1);
}
*startup_done = 1;
}
/* all UDP listeners on same interface
* have same SHM load pointer */
pt[process_no].load = load_p;
udp_rcv_loop();
exit(-1);
}
else {
/* if the first process that runs startup_route*/
if(chd_rank == 1 && startup_rlist.a) {
while(!startup_done) {
usleep(5);
}
shm_free(startup_done);
}
}
}
}
/*parent*/
/*close(udp_sock)*/; /*if it's closed=>sendto invalid fd errors?*/
}
}
#ifdef USE_SCTP
if(!sctp_disable) {
for(si=sctp_listen; si; si=si->next) {
for(i=0; i<children_no; i++) {
chd_rank++;
if ( (pid=internal_fork( "SCTP receiver"))<0 ) {
LM_CRIT("cannot fork SCTP process\n");
goto error;
} else if (pid==0) {
/* new SCTP process */
/* set a more detailed description */
set_proc_attrs("SIP receiver %.*s ",
si->sock_str.len, si->sock_str.s);
bind_address=si; /* shortcut */
if (init_child(chd_rank) < 0) {
LM_ERR("init_child failed\n");
if (send_status_code(-1) < 0)
LM_ERR("failed to send status code\n");
clean_write_pipeend();
exit(-1);
}
if (send_status_code(0) < 0)
LM_ERR("failed to send status code\n");
clean_write_pipeend();
sctp_server_rcv_loop();
exit(-1);
}
}
}
}
#endif /* USE_SCTP */
/* this is the main process -> it shouldn't send anything */
bind_address=0;
/* fork for the timer process*/
if (start_timer_processes()!=0) {
LM_CRIT("cannot start timer process(es)\n");
goto error;
}
#ifdef USE_TCP
if (!tcp_disable) {
/* start tcp & tls receivers */
if (tcp_init_children(&chd_rank)<0) goto error;
/* start tcp+tls master proc */
if ( (pid=internal_fork( "TCP main"))<0 ) {
LM_CRIT("cannot fork tcp main process\n");
goto error;
} else if (pid==0) {
/* child */
/* close the TCP inter-process sockets */
close(unix_tcp_sock);
unix_tcp_sock = -1;
close(pt[process_no].unix_sock);
pt[process_no].unix_sock = -1;
/* init modules */
if (init_child(PROC_TCP_MAIN) < 0) {
LM_ERR("error in init_child for tcp main\n");
if (send_status_code(-1) < 0)
LM_ERR("failed to send status code\n");
clean_write_pipeend();
exit(-1);
}
if (send_status_code(0) < 0)
LM_ERR("failed to send status code\n");
clean_write_pipeend();
tcp_main_loop();
exit(-1);
}
}
#endif
/* main process left */
is_main=1;
set_proc_attrs("attendant");
if (init_child(PROC_MAIN) < 0) {
LM_ERR("error in init_child for PROC_MAIN\n");
goto error;
}
if (send_status_code(0) < 0)
LM_ERR("failed to send status code\n");
clean_write_pipeend();
for(;;) {
handle_sigs();
pause();
}
/*return 0; */
error:
is_main=1; /* if we are here, we are the "main process",
any forked children should exit with exit(-1) and not
ever use return */
if (!dont_fork && send_status_code(-1) < 0)
LM_ERR("failed to send status code\n");
clean_write_pipeend();
return -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;
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 (create_status_pipe() < 0) {
LM_ERR("failed to create status pipe");
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);
if (r<=0) {
LM_ERR("unable to write pid to file %s: %s\n",
pid_file, strerror(errno));
goto error;
}
fclose(pid_stream);
}
}
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);
if (r<=0) {
LM_ERR("unable to write pgid to file %s: %s\n",
pid_file, strerror(errno));
goto error;
}
fclose(pid_stream);
}
}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;
}