/*
process.c -- process management functions
- Copyright (C) 1999,2000 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2000 Guus Sliepen <guus@sliepen.warande.net>
+ Copyright (C) 1999-2002 Ivo Timmermans <ivo@o2w.nl>,
+ 2000-2002 Guus Sliepen <guus@sliepen.eu.org>
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
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: process.c,v 1.1.2.4 2000/11/17 10:03:02 guus Exp $
+ $Id: process.c,v 1.1.2.50 2002/09/30 19:04:37 zarq Exp $
*/
#include "config.h"
#include <syslog.h>
#include <sys/ioctl.h>
#include <sys/types.h>
+#include <sys/stat.h>
#include <sys/wait.h>
+#include <stdlib.h>
#include <unistd.h>
+#include <termios.h>
-#include <list.h>
#include <pidfile.h>
#include <utils.h>
#include <xalloc.h>
#include "conf.h"
#include "process.h"
+#include "subnet.h"
+#include "device.h"
+#include "connection.h"
+#include "device.h"
#include "system.h"
-/* A list containing all our children */
-list_t *child_pids;
-
/* If zero, don't detach from the terminal. */
int do_detach = 1;
-static pid_t ppid;
-
extern char *identname;
extern char *pidfilename;
extern char **g_argv;
+sigset_t emptysigset;
+
+static int saved_debug_lvl = -1;
+
+extern int sighup;
+extern int sigalrm;
+extern int do_purge;
+
void memory_full(int size)
{
- syslog(LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exiting."), size);
- cp_trace();
- exit(1);
+ syslog(LOG_ERR, _("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)
{
- close_network_connections();
+ cp();
+
+ close_network_connections();
+
+ if(debug_lvl > DEBUG_NOTHING)
+ dump_device_stats();
- if(debug_lvl > DEBUG_NOTHING)
- syslog(LOG_INFO, _("Total bytes written: tap %d, socket %d; bytes read: tap %d, socket %d"),
- total_tap_out, total_socket_out, total_tap_in, total_socket_in);
+ syslog(LOG_NOTICE, _("Terminating"));
- closelog();
- kill(ppid, SIGTERM);
- exit(c);
+ closelog();
+ exit(c);
}
/*
*/
int write_pidfile(void)
{
- int pid;
-
- 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;
-
- return 0;
+ int pid;
+
+ cp();
+
+ pid = check_pid(pidfilename);
+
+ if(pid) {
+ 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;
+
+ return 0;
}
/*
kill older tincd for this net
*/
-int kill_other(void)
+int kill_other(int signal)
{
- int pid;
-
- 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, SIGTERM) && errno == ESRCH)
- fprintf(stderr, _("Removing stale lock file.\n"));
- remove_pid(pidfilename);
-
- return 0;
+ int pid;
+
+ cp();
+
+ pid = read_pid(pidfilename);
+
+ if(!pid) {
+ 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);
+ }
+
+ return 0;
}
/*
*/
int detach(void)
{
- int fd;
- pid_t pid;
+ cp();
- setup_signals();
+ setup_signals();
- if(write_pidfile())
- return -1;
+ /* First check if we can open a fresh new pidfile */
- if(do_detach)
- daemon(0, 0);
+ if(write_pidfile())
+ return -1;
- openlog(identname, LOG_CONS | LOG_PID, LOG_DAEMON);
+ /* If we succeeded in doing that, detach */
- if(debug_lvl > DEBUG_NOTHING)
- syslog(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
- VERSION, __DATE__, __TIME__, debug_lvl);
- else
- syslog(LOG_NOTICE, _("tincd %s starting"), VERSION);
+ closelog();
- xalloc_fail_func = memory_full;
+ if(do_detach) {
+ if(daemon(0, 0) < 0) {
+ fprintf(stderr, _("Couldn't detach from terminal: %s"),
+ strerror(errno));
+ return -1;
+ }
- return 0;
+ /* 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)
+ syslog(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
+ VERSION, __DATE__, __TIME__, debug_lvl);
+ else
+ syslog(LOG_NOTICE, _("tincd %s starting"), VERSION);
+
+ xalloc_fail_func = memory_full;
+
+ 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)
+void _execute_script(const char *scriptname, char **envp)
+ __attribute__ ((noreturn));
+void _execute_script(const char *scriptname, char **envp)
{
- int error = 0;
- char *scriptname;
- char *s;
-
- if(netname)
- {
- asprintf(&s, "NETNAME=%s", netname);
- putenv(s); /* Don't free s! see man 3 putenv */
- }
-#ifdef HAVE_UNSETENV
- else
- {
- unsetenv("NETNAME");
- }
-#endif
+ cp();
- if(chdir(confbase) < 0)
- /* This cannot fail since we already read config files from this
- directory. - Guus */
- /* Yes this can fail, somebody could have removed this directory
- when we didn't pay attention. - Ivo */
- {
- if(chdir("/") < 0)
- /* Now if THIS fails, something wicked is going on. - Ivo */
- syslog(LOG_ERR, _("Couldn't chdir to `/': %m"));
-
- /* Continue anyway. */
- }
-
- asprintf(&scriptname, "%s/%s", confbase, name);
-
- /* Close all file descriptors */
- closelog();
- fcloseall();
-
- /* Open standard input */
- if(open("/dev/null", O_RDONLY) < 0)
- {
- syslog(LOG_ERR, _("Opening `/dev/null' failed: %m"));
- error = 1;
- }
-
- if(!error)
- {
- /* Standard output directly goes to syslog */
- openlog(name, LOG_CONS | LOG_PID, LOG_DAEMON);
- /* Standard error as well */
- if(dup2(1, 2) < 0)
- {
- syslog(LOG_ERR, _("System call `%s' failed: %m"),
- "dup2");
- error = 1;
- }
- }
-
- if(error && debug_lvl > 1)
- syslog(LOG_INFO, _("This means that any output the script generates will not be shown in syslog."));
-
- execl(scriptname, NULL);
- /* No return on success */
-
- if(errno != ENOENT) /* Ignore if the file does not exist */
- syslog(LOG_WARNING, _("Error executing `%s': %m"), scriptname);
-
- /* No need to free things */
- exit(0);
+ while(*envp)
+ putenv(*envp++);
+
+ chdir("/");
+
+ /* Close all file descriptors */
+ closelog(); /* <- this means we cannot use syslog() here anymore! */
+ fcloseall();
+
+ execl(scriptname, NULL);
+ /* No return on success */
+
+ openlog("tinc", LOG_CONS | LOG_PID, LOG_DAEMON);
+ syslog(LOG_ERR, _("Could not execute `%s': %s"), scriptname,
+ strerror(errno));
+ exit(errno);
}
/*
Fork and execute the program pointed to by name.
*/
-int execute_script(const char *name)
+int execute_script(const char *name, char **envp)
{
- pid_t pid;
-
- if((pid = fork()) < 0)
- {
- syslog(LOG_ERR, _("System call `%s' failed: %m"),
- "fork");
- return -1;
- }
-
- if(pid)
- {
- list_append(child_pids, (void*)(int)pid);
- return 0;
- }
-
- /* Child here */
- _execute_script(name);
-}
+ pid_t pid;
+ int status;
+ struct stat s;
+ char *scriptname;
-/*
- Check a child (the pointer data is actually an integer, the PID of
- that child. A non-zero return value means that the child has exited
- and can be removed from our list.
-*/
-int check_child(void *data)
-{
- pid_t pid;
- int status;
-
- pid = (pid_t) data;
- pid = waitpid(pid, &status, WNOHANG);
- if(WIFEXITED(status))
- {
- if(WIFSIGNALED(status)) /* Child was killed by a signal */
- {
- syslog(LOG_ERR, _("Child with PID %d was killed by signal %d (%s)"),
- pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
- return -1;
+ cp();
+
+ asprintf(&scriptname, "%s/%s", confbase, name);
+
+ /* First check if there is a script */
+
+ if(stat(scriptname, &s))
+ return 0;
+
+ pid = fork();
+
+ if(pid < 0) {
+ syslog(LOG_ERR, _("System call `%s' failed: %s"), "fork",
+ strerror(errno));
+ return -1;
}
- if(WEXITSTATUS(status) != 0)
- {
- syslog(LOG_INFO, _("Child with PID %d exited with code %d"),
- WEXITSTATUS(status));
+
+ if(pid) {
+ if(debug_lvl >= DEBUG_STATUS)
+ syslog(LOG_INFO, _("Executing script %s"), name);
+
+ free(scriptname);
+
+ 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;
+ }
}
- return -1;
- }
- /* Child is still running */
- return 0;
-}
+ /* Child here */
-/*
- Check the status of all our children.
-*/
-void check_children(void)
-{
- list_forall_nodes(child_pids, check_child);
+ _execute_script(scriptname, envp);
}
Signal handlers.
*/
-RETSIGTYPE
-sigterm_handler(int a)
+RETSIGTYPE sigterm_handler(int a)
{
- if(debug_lvl > DEBUG_NOTHING)
- syslog(LOG_NOTICE, _("Got TERM signal"));
+ if(debug_lvl > DEBUG_NOTHING)
+ syslog(LOG_NOTICE, _("Got TERM signal"));
- cleanup_and_exit(0);
+ cleanup_and_exit(0);
}
-RETSIGTYPE
-sigquit_handler(int a)
+RETSIGTYPE sigquit_handler(int a)
{
- if(debug_lvl > DEBUG_NOTHING)
- syslog(LOG_NOTICE, _("Got QUIT signal"));
- cleanup_and_exit(0);
+ if(debug_lvl > DEBUG_NOTHING)
+ syslog(LOG_NOTICE, _("Got QUIT signal"));
+ cleanup_and_exit(0);
}
-RETSIGTYPE
-sigsegv_square(int a)
+RETSIGTYPE fatal_signal_square(int a)
{
- syslog(LOG_ERR, _("Got another SEGV signal: not restarting"));
- exit(0);
+ syslog(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a,
+ strsignal(a));
+ cp_trace();
+ exit(1);
}
-RETSIGTYPE
-sigsegv_handler(int a)
+RETSIGTYPE fatal_signal_handler(int a)
{
- syslog(LOG_ERR, _("Got SEGV signal"));
- cp_trace();
-
- if(do_detach)
- {
- syslog(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
- signal(SIGSEGV, sigsegv_square);
- close_network_connections();
- sleep(5);
- remove_pid(pidfilename);
- execvp(g_argv[0], g_argv);
- }
- else
- {
- syslog(LOG_NOTICE, _("Not restarting."));
- exit(0);
- }
+ struct sigaction act;
+ syslog(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
+ cp_trace();
+
+ if(do_detach) {
+ syslog(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
+
+ act.sa_handler = fatal_signal_square;
+ act.sa_mask = emptysigset;
+ act.sa_flags = 0;
+ sigaction(SIGSEGV, &act, NULL);
+
+ close_network_connections();
+ sleep(5);
+ remove_pid(pidfilename);
+ execvp(g_argv[0], g_argv);
+ } else {
+ syslog(LOG_NOTICE, _("Not restarting."));
+ exit(1);
+ }
}
-RETSIGTYPE
-sighup_handler(int a)
+RETSIGTYPE sighup_handler(int a)
{
- if(debug_lvl > DEBUG_NOTHING)
- syslog(LOG_NOTICE, _("Got HUP signal"));
- sighup = 1;
+ if(debug_lvl > DEBUG_NOTHING)
+ syslog(LOG_NOTICE, _("Got HUP signal"));
+ sighup = 1;
+}
+
+RETSIGTYPE sigint_handler(int a)
+{
+ if(saved_debug_lvl != -1) {
+ syslog(LOG_NOTICE, _("Reverting to old debug level (%d)"),
+ saved_debug_lvl);
+ debug_lvl = saved_debug_lvl;
+ saved_debug_lvl = -1;
+ } 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
-sigint_handler(int a)
+RETSIGTYPE sigalrm_handler(int a)
{
- if(debug_lvl > DEBUG_NOTHING)
- syslog(LOG_NOTICE, _("Got INT signal, exiting"));
- cleanup_and_exit(0);
+ if(debug_lvl > DEBUG_NOTHING)
+ syslog(LOG_NOTICE, _("Got ALRM signal"));
+ sigalrm = 1;
}
-RETSIGTYPE
-sigusr1_handler(int a)
+RETSIGTYPE sigusr1_handler(int a)
{
- dump_conn_list();
+ dump_connections();
}
-RETSIGTYPE
-sigusr2_handler(int a)
+RETSIGTYPE sigusr2_handler(int a)
{
- dump_subnet_list();
+ dump_device_stats();
+ dump_nodes();
+ dump_edges();
+ dump_subnets();
}
-RETSIGTYPE
-sighuh(int a)
+RETSIGTYPE sigwinch_handler(int a)
{
- syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
- cp_trace();
+ extern int do_purge;
+ do_purge = 1;
}
-void
-setup_signals(void)
+RETSIGTYPE unexpected_signal_handler(int a)
{
- int i;
-
- for(i=0;i<32;i++)
- signal(i,sighuh);
-
- if(signal(SIGTERM, SIG_IGN) != SIG_ERR)
- signal(SIGTERM, sigterm_handler);
- if(signal(SIGQUIT, SIG_IGN) != SIG_ERR)
- signal(SIGQUIT, sigquit_handler);
- if(signal(SIGSEGV, SIG_IGN) != SIG_ERR)
- signal(SIGSEGV, sigsegv_handler);
- if(signal(SIGHUP, SIG_IGN) != SIG_ERR)
- signal(SIGHUP, sighup_handler);
- signal(SIGPIPE, SIG_IGN);
- if(signal(SIGINT, SIG_IGN) != SIG_ERR)
- signal(SIGINT, sigint_handler);
- signal(SIGUSR1, sigusr1_handler);
- signal(SIGUSR2, sigusr2_handler);
- signal(SIGCHLD, SIG_IGN);
+ syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
+ cp_trace();
}
-RETSIGTYPE parent_exit(int a)
+RETSIGTYPE ignore_signal_handler(int a)
{
- exit(0);
+ 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