+++ /dev/null
-/*
- process.c -- process management functions
- Copyright (C) 1999-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2000-2002 Guus Sliepen <guus@sliepen.warande.net>
-
- This program 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.
-
- This program 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., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id: process.c,v 1.1 2002/04/28 12:46:26 zarq Exp $
-*/
-
-#include "config.h"
-
-#include <errno.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <stdio.h>
-#include <string.h>
-#include <syslog.h>
-#include <sys/ioctl.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <termios.h>
-
-#include <pidfile.h>
-#include <utils.h>
-#include <xalloc.h>
-
-#include "conf.h"
-#include "interface.h"
-#include "process.h"
-#include "subnet.h"
-#include "connection.h"
-#include "logging.h"
-
-#include "system.h"
-
-/* If zero, don't detach from the terminal. */
-int do_detach = 1;
-
-extern char *identname;
-extern char *pidfilename;
-extern char **g_argv;
-
-sigset_t emptysigset;
-
-static int saved_debug_lvl = 0;
-
-extern int sighup;
-extern int sigalrm;
-extern int do_purge;
-
-void memory_full(int size)
-{
- log(0, TLOG_ERROR,
- _("Memory exhausted (couldn't allocate %d bytes), exitting."),
- size);
- cp_trace();
- exit(1);
-}
-
-/* Some functions the less gifted operating systems might lack... */
-
-#ifndef HAVE_FCLOSEALL
-int fcloseall(void)
-{
- fflush(stdin);
- fflush(stdout);
- fflush(stderr);
- fclose(stdin);
- fclose(stdout);
- fclose(stderr);
- return 0;
-}
-#endif
-
-/*
- Close network connections, and terminate neatly
-*/
-void cleanup_and_exit(int c)
-{
-cp
- close_network_connections();
-
- syslog(LOG_NOTICE, _("Terminating"));
-
- closelog();
- exit(c);
-}
-
-/*
- check for an existing tinc for this net, and write pid to pidfile
-*/
-int write_pidfile(void)
-{
- int pid;
-cp
- if((pid = check_pid(pidfilename)))
- {
- if(netname)
- fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
- netname, pid);
- else
- fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
- return 1;
- }
-
- /* if it's locked, write-protected, or whatever */
- if(!write_pid(pidfilename))
- return 1;
-cp
- return 0;
-}
-
-/*
- kill older tincd for this net
-*/
-int kill_other(int signal)
-{
- int pid;
-cp
- if(!(pid = read_pid(pidfilename)))
- {
- if(netname)
- fprintf(stderr, _("No other tincd is running for net `%s'.\n"), netname);
- else
- fprintf(stderr, _("No other tincd is running.\n"));
- return 1;
- }
-
- errno = 0; /* No error, sometimes errno is only changed on error */
- /* ESRCH is returned when no process with that pid is found */
- if(kill(pid, signal) && errno == ESRCH)
- {
- if(netname)
- fprintf(stderr, _("The tincd for net `%s' is no longer running. "), netname);
- else
- fprintf(stderr, _("The tincd is no longer running. "));
-
- fprintf(stderr, _("Removing stale lock file.\n"));
- remove_pid(pidfilename);
- }
-cp
- return 0;
-}
-
-/*
- Detach from current terminal, write pidfile, kill parent
-*/
-int detach(void)
-{
-cp
- setup_signals();
-
- /* First check if we can open a fresh new pidfile */
-
- if(write_pidfile())
- return -1;
-
- /* If we succeeded in doing that, detach */
-
- closelog();
-
- if(do_detach)
- {
- if(daemon(0, 0) < 0)
- {
- fprintf(stderr, _("Couldn't detach from terminal: %s"), strerror(errno));
- return -1;
- }
-
- /* Now UPDATE the pid in the pidfile, because we changed it... */
-
- if(!write_pid(pidfilename))
- return -1;
- }
-
- openlog(identname, LOG_CONS | LOG_PID, LOG_DAEMON);
-
- if(debug_lvl > DEBUG_NOTHING)
- log(0, TLOG_NOTICE,
- _("tincd %s (%s %s) starting, debug level %d"),
- VERSION, __DATE__, __TIME__, debug_lvl);
- else
- log(DEBUG_NOTHING, TLOG_NOTICE,
- _("tincd %s starting"),
- VERSION);
-
- xalloc_fail_func = memory_full;
-cp
- return 0;
-}
-
-/*
- Execute the program name, with sane environment. All output will be
- redirected to syslog.
-*/
-void _execute_script(const char *name) __attribute__ ((noreturn));
-void _execute_script(const char *name)
-{
- char *scriptname;
- char *s;
-cp
-#ifdef HAVE_UNSETENV
- unsetenv("NETNAME");
- unsetenv("INTERFACE");
-#endif
-
- if(netname)
- {
- asprintf(&s, "NETNAME=%s", netname);
- putenv(s); /* Don't free s! see man 3 putenv */
- }
-
- chdir("/");
-
- asprintf(&scriptname, "%s/%s", confbase, name);
-
- /* Close all file descriptors */
- closelog(); /* <- this means we cannot use syslog() here anymore! */
- fcloseall();
-
- execl(scriptname, NULL);
- /* No return on success */
-
- if(errno != ENOENT) /* Ignore if the file does not exist */
- exit(1); /* Some error while trying execl(). */
- else
- exit(0);
-}
-
-/*
- Fork and execute the program pointed to by name.
-*/
-int execute_script(const char *name)
-{
- pid_t pid;
- int status;
-cp
- if((pid = fork()) < 0)
- {
- syslog(LOG_ERR, _("System call `%s' failed: %s"), "fork", strerror(errno));
- return -1;
- }
-
- if(pid)
- {
- log(DEBUG_STATUS, TLOG_INFO,
- _("Executing script %s"),
- name);
-
- if(waitpid(pid, &status, 0) == pid)
- {
- if(WIFEXITED(status)) /* Child exited by itself */
- {
- if(WEXITSTATUS(status))
- {
- syslog(LOG_ERR, _("Process %d (%s) exited with non-zero status %d"), pid, name, WEXITSTATUS(status));
- return -1;
- }
- else
- return 0;
- }
- else if(WIFSIGNALED(status)) /* Child was killed by a signal */
- {
- syslog(LOG_ERR, _("Process %d (%s) was killed by signal %d (%s)"),
- pid, name, WTERMSIG(status), strsignal(WTERMSIG(status)));
- return -1;
- }
- else /* Something strange happened */
- {
- syslog(LOG_ERR, _("Process %d (%s) terminated abnormally"), pid, name);
- return -1;
- }
- }
- else
- {
- syslog(LOG_ERR, _("System call `%s' failed: %s"), "waitpid", strerror(errno));
- return -1;
- }
- }
-cp
- /* Child here */
-
- _execute_script(name);
-}
-
-
-/*
- Signal handlers.
-*/
-
-RETSIGTYPE
-sigterm_handler(int a)
-{
- log(DEBUG_NOTHING, TLOG_NOTICE,
- _("Got TERM signal"));
-
- cleanup_and_exit(0);
-}
-
-RETSIGTYPE
-sigquit_handler(int a)
-{
- log(DEBUG_NOTHING, TLOG_NOTICE,
- _("Got QUIT signal"));
- cleanup_and_exit(0);
-}
-
-RETSIGTYPE
-fatal_signal_square(int a)
-{
- syslog(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a, strsignal(a));
- cp_trace();
- exit(1);
-}
-
-RETSIGTYPE
-fatal_signal_handler(int a)
-{
- syslog(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
- cp_trace();
-
- syslog(LOG_NOTICE, _("Not restarting."));
- exit(1);
-}
-
-RETSIGTYPE
-sighup_handler(int a)
-{
- if(debug_lvl > DEBUG_NOTHING)
- syslog(LOG_NOTICE, _("Got HUP signal"));
- sighup = 1;
-}
-
-RETSIGTYPE
-sigint_handler(int a)
-{
- if(saved_debug_lvl)
- {
- syslog(LOG_NOTICE, _("Reverting to old debug level (%d)"),
- saved_debug_lvl);
- debug_lvl = saved_debug_lvl;
- saved_debug_lvl = 0;
- }
- else
- {
- syslog(LOG_NOTICE, _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."),
- debug_lvl);
- saved_debug_lvl = debug_lvl;
- debug_lvl = 5;
- }
-}
-
-RETSIGTYPE
-sigalrm_handler(int a)
-{
- if(debug_lvl > DEBUG_NOTHING)
- syslog(LOG_NOTICE, _("Got ALRM signal"));
- sigalrm = 1;
-}
-
-RETSIGTYPE
-sigusr1_handler(int a)
-{
- dump_connections();
-}
-
-RETSIGTYPE
-sigusr2_handler(int a)
-{
- dump_nodes();
- dump_edges();
- dump_subnets();
-}
-
-RETSIGTYPE
-sigwinch_handler(int a)
-{
- extern int do_purge;
- do_purge = 1;
-}
-
-RETSIGTYPE
-unexpected_signal_handler(int a)
-{
- syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
- cp_trace();
-}
-
-RETSIGTYPE
-ignore_signal_handler(int a)
-{
- if(debug_lvl >= DEBUG_SCARY_THINGS)
- {
- syslog(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
- cp_trace();
- }
-}
-
-struct {
- int signal;
- void (*handler)(int);
-} sighandlers[] = {
- { SIGHUP, sighup_handler },
- { SIGTERM, sigterm_handler },
- { SIGQUIT, sigquit_handler },
- { SIGSEGV, fatal_signal_handler },
- { SIGBUS, fatal_signal_handler },
- { SIGILL, fatal_signal_handler },
- { SIGPIPE, ignore_signal_handler },
- { SIGINT, sigint_handler },
- { SIGUSR1, sigusr1_handler },
- { SIGUSR2, sigusr2_handler },
- { SIGCHLD, ignore_signal_handler },
- { SIGALRM, sigalrm_handler },
- { SIGWINCH, sigwinch_handler },
- { 0, NULL }
-};
-
-void
-setup_signals(void)
-{
- int i;
- struct sigaction act;
-
- sigemptyset(&emptysigset);
- act.sa_handler = NULL;
- act.sa_mask = emptysigset;
- act.sa_flags = 0;
-
- /* Set a default signal handler for every signal, errors will be
- ignored. */
- for(i = 0; i < NSIG; i++)
- {
- if(!do_detach)
- act.sa_handler = SIG_DFL;
- else
- act.sa_handler = unexpected_signal_handler;
- sigaction(i, &act, NULL);
- }
-
- /* If we didn't detach, allow coredumps */
- if(!do_detach)
- sighandlers[3].handler = SIG_DFL;
-
- /* Then, for each known signal that we want to catch, assign a
- handler to the signal, with error checking this time. */
- for(i = 0; sighandlers[i].signal; i++)
- {
- act.sa_handler = sighandlers[i].handler;
- if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
- fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
- sighandlers[i].signal, strsignal(sighandlers[i].signal), strerror(errno));
- }
-}
projects / tinc / blobdiff