X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprocess.c;h=a70d8d28e00d8f77195103e296d5db9ba8a537ee;hp=1319c0c0b90881f0aa6188f64705efaa58f4667e;hb=161f917dd03c174742fb8c6722f430a93b506cb1;hpb=cf49b2c0647554613874cce495e4a7937a9f7863 diff --git a/src/process.c b/src/process.c index 1319c0c0..a70d8d28 100644 --- a/src/process.c +++ b/src/process.c @@ -1,7 +1,7 @@ /* process.c -- process management functions - Copyright (C) 1999,2000 Ivo Timmermans , - 2000 Guus Sliepen + Copyright (C) 1999-2002 Ivo Timmermans , + 2000-2002 Guus Sliepen 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 @@ -17,7 +17,7 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: process.c,v 1.1.2.14 2000/11/24 23:13:05 guus Exp $ + $Id: process.c,v 1.1.2.48 2002/09/10 09:40:25 guus Exp $ */ #include "config.h" @@ -30,12 +30,12 @@ #include #include #include +#include #include #include #include #include -#include #include #include #include @@ -43,7 +43,9 @@ #include "conf.h" #include "process.h" #include "subnet.h" +#include "device.h" #include "connection.h" +#include "device.h" #include "system.h" @@ -54,11 +56,19 @@ 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) { - 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... */ @@ -66,12 +76,13 @@ void memory_full(int size) #ifndef HAVE_FCLOSEALL int fcloseall(void) { - fflush(stdin); - fflush(stdout); - fflush(stderr); - fclose(stdin); - fclose(stdout); - fclose(stderr); + fflush(stdin); + fflush(stdout); + fflush(stderr); + fclose(stdin); + fclose(stdout); + fclose(stderr); + return 0; } #endif @@ -80,17 +91,17 @@ int fcloseall(void) */ void cleanup_and_exit(int c) { -cp - close_network_connections(); + cp(); - 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); + close_network_connections(); - syslog(LOG_NOTICE, _("Terminating")); + if(debug_lvl > DEBUG_NOTHING) + dump_device_stats(); - closelog(); - exit(c); + syslog(LOG_NOTICE, _("Terminating")); + + closelog(); + exit(c); } /* @@ -98,48 +109,63 @@ cp */ 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; + 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; -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, SIGTERM) && errno == ESRCH) - fprintf(stderr, _("Removing stale lock file.\n")); - remove_pid(pidfilename); -cp - 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; } /* @@ -147,233 +173,306 @@ cp */ int detach(void) { -cp - setup_signals(); + cp(); + + setup_signals(); + + /* First check if we can open a fresh new pidfile */ + + if(write_pidfile()) + return -1; - if(write_pidfile()) - return -1; + /* If we succeeded in doing that, detach */ - if(do_detach) - if(daemon(0, 0) < 0) - return -1; + closelog(); - openlog(identname, LOG_CONS | LOG_PID, LOG_DAEMON); + if(do_detach) { + if(daemon(0, 0) < 0) { + fprintf(stderr, _("Couldn't detach from terminal: %s"), + strerror(errno)); + return -1; + } - 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); + /* Now UPDATE the pid in the pidfile, because we changed it... */ - xalloc_fail_func = memory_full; -cp - return 0; + 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; - int fd; - -cp - 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(); - 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); + 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; - int status; -cp - if((pid = fork()) < 0) - { - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "fork"); - return -1; - } - - if(pid) - { - if(debug_lvl >= DEBUG_STATUS) - syslog(LOG_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 abnormaly"), pid, name); - return -1; - } - } - else - { - syslog(LOG_ERR, _("System call `%s' failed: %m"), "waitpid"); - return -1; - } - } -cp - /* Child here */ - - _execute_script(name); + pid_t pid; + int status; + struct stat s; + char *scriptname; + + 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(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; + } + } + + /* Child here */ + + _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) +{ + if(debug_lvl > DEBUG_NOTHING) + syslog(LOG_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) +{ + 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 -sigquit_handler(int a) +RETSIGTYPE sighup_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 HUP signal")); + sighup = 1; } -RETSIGTYPE -sigsegv_square(int a) +RETSIGTYPE sigint_handler(int a) { - syslog(LOG_ERR, _("Got another SEGV signal: not restarting")); - cp_trace(); - exit(0); + 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 -sigsegv_handler(int a) +RETSIGTYPE sigalrm_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); - } + if(debug_lvl > DEBUG_NOTHING) + syslog(LOG_NOTICE, _("Got ALRM signal")); + sigalrm = 1; } -RETSIGTYPE -sighup_handler(int a) +RETSIGTYPE sigusr1_handler(int a) { - if(debug_lvl > DEBUG_NOTHING) - syslog(LOG_NOTICE, _("Got HUP signal")); - sighup = 1; + dump_connections(); } -RETSIGTYPE -sigint_handler(int a) +RETSIGTYPE sigusr2_handler(int a) { - if(debug_lvl > DEBUG_NOTHING) - syslog(LOG_NOTICE, _("Got INT signal, exiting")); - cleanup_and_exit(0); + dump_device_stats(); + dump_nodes(); + dump_edges(); + dump_subnets(); } -RETSIGTYPE -sigusr1_handler(int a) +RETSIGTYPE sigwinch_handler(int a) { - dump_connection_list(); + extern int do_purge; + do_purge = 1; } -RETSIGTYPE -sigusr2_handler(int a) +RETSIGTYPE unexpected_signal_handler(int a) { - dump_subnet_list(); + syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a)); + cp_trace(); } -RETSIGTYPE -sighuh(int a) +RETSIGTYPE ignore_signal_handler(int a) { - syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a)); - cp_trace(); + if(debug_lvl >= DEBUG_SCARY_THINGS) { + syslog(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a)); + cp_trace(); + } } -void -setup_signals(void) +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; - - 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); + 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)); + } }