X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprocess.c;h=d971a0f23b2eb9d6f2798f2c5e7f6e369f2c7f4e;hp=29e49fa4f0ea5102d66539e45d54e73d7229d896;hb=ac066bb057dcb187bf91670793ba5e6ca456e052;hpb=394ed3fb174bb629bfb4b441fe58842562f955de diff --git a/src/process.c b/src/process.c index 29e49fa4..d971a0f2 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) 1999-2001 Ivo Timmermans , + 2000,2001 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 1.1.2.10 2000/11/22 19:14:08 guus Exp $ + $Id: process.c,v 1.1.2.27 2001/10/27 13:13:35 guus Exp $ */ #include "config.h" @@ -31,36 +31,32 @@ #include #include #include +#include #include +#include -#include #include #include #include #include "conf.h" #include "process.h" +#include "subnet.h" +#include "device.h" +#include "connection.h" #include "system.h" -/* A list containing all our children */ -list_t *child_pids = NULL; - /* 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; -void init_processes(void) -{ -cp - child_pids = list_new(); -cp -} +sigset_t emptysigset; + +static int saved_debug_lvl = 0; void memory_full(int size) { @@ -69,6 +65,20 @@ void memory_full(int size) 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); +} +#endif + /* Close network connections, and terminate neatly */ @@ -78,11 +88,11 @@ cp close_network_connections(); 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); + dump_device_stats(); + + syslog(LOG_NOTICE, _("Terminating")); closelog(); - kill(ppid, SIGTERM); exit(c); } @@ -113,7 +123,7 @@ cp /* kill older tincd for this net */ -int kill_other(void) +int kill_other(int signal) { int pid; cp @@ -128,7 +138,7 @@ cp 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) + if(kill(pid, signal) && errno == ESRCH) fprintf(stderr, _("Removing stale lock file.\n")); remove_pid(pidfilename); cp @@ -140,17 +150,32 @@ cp */ int detach(void) { - int fd; - pid_t pid; cp setup_signals(); - if(do_detach) - daemon(0, 0); - + /* 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) @@ -171,11 +196,8 @@ cp void _execute_script(const char *name) __attribute__ ((noreturn)); void _execute_script(const char *name) { - int error = 0; char *scriptname; char *s; - int fd; - cp if(netname) { @@ -189,62 +211,21 @@ cp } #endif - 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. */ - } + chdir("/"); asprintf(&scriptname, "%s/%s", confbase, name); /* Close all file descriptors */ - closelog(); + closelog(); /* <- this means we cannot use syslog() here anymore! */ fcloseall(); - /* Open standard input */ - if((fd = open("/dev/null", O_RDONLY)) < 0) - { - syslog(LOG_ERR, _("Opening `/dev/null' failed: %m")); - error = 1; - } - if(dup2(fd, 0) != 0) - { - syslog(LOG_ERR, _("Couldn't assign /dev/null to standard input: %m")); - error = 1; - } - - if(!error) - { - close(1); /* fd #1 should be the first available filedescriptor now. */ - /* 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); + if(errno != ENOENT) /* Ignore if the file does not exist */ + exit(1); /* Some error while trying execl(). */ + else + exit(0); } /* @@ -253,6 +234,7 @@ cp int execute_script(const char *name) { pid_t pid; + int status; cp if((pid = fork()) < 0) { @@ -263,52 +245,43 @@ cp if(pid) { - list_append(child_pids, &pid); - return 0; + 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 abnormally"), pid, name); + return -1; + } + } + else + { + syslog(LOG_ERR, _("System call `%s' failed: %m"), "waitpid"); + return -1; + } } cp /* Child here */ - _execute_script(name); -} - -/* - 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; -cp - 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; - } - if(WEXITSTATUS(status) != 0) - { - syslog(LOG_INFO, _("Child with PID %d exited with code %d"), - WEXITSTATUS(status)); - } - return -1; - } -cp - /* Child is still running */ - return 0; -} -/* - Check the status of all our children. -*/ -void check_children(void) -{ - list_forall_nodes(child_pids, check_child); + _execute_script(name); } @@ -317,7 +290,7 @@ void check_children(void) */ RETSIGTYPE -sigterm_handler(int a) +sigterm_handler(int a, siginfo_t *info, void *b) { if(debug_lvl > DEBUG_NOTHING) syslog(LOG_NOTICE, _("Got TERM signal")); @@ -326,7 +299,7 @@ sigterm_handler(int a) } RETSIGTYPE -sigquit_handler(int a) +sigquit_handler(int a, siginfo_t *info, void *b) { if(debug_lvl > DEBUG_NOTHING) syslog(LOG_NOTICE, _("Got QUIT signal")); @@ -334,22 +307,29 @@ sigquit_handler(int a) } RETSIGTYPE -sigsegv_square(int a) +sigsegv_square(int a, siginfo_t *info, void *b) { syslog(LOG_ERR, _("Got another SEGV signal: not restarting")); - exit(0); + cp_trace(); + exit(1); } RETSIGTYPE -sigsegv_handler(int a) +sigsegv_handler(int a, siginfo_t *info, void *b) { + struct sigaction act; 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); + + act.sa_handler = NULL; + act.sa_mask = emptysigset; + act.sa_flags = SA_SIGINFO; + act.sa_sigaction = sigsegv_square; + close_network_connections(); sleep(5); remove_pid(pidfilename); @@ -363,7 +343,7 @@ sigsegv_handler(int a) } RETSIGTYPE -sighup_handler(int a) +sighup_handler(int a, siginfo_t *info, void *b) { if(debug_lvl > DEBUG_NOTHING) syslog(LOG_NOTICE, _("Got HUP signal")); @@ -371,57 +351,99 @@ sighup_handler(int a) } RETSIGTYPE -sigint_handler(int a) +sigint_handler(int a, siginfo_t *info, void *b) { - if(debug_lvl > DEBUG_NOTHING) - syslog(LOG_NOTICE, _("Got INT signal, exiting")); - cleanup_and_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 -sigusr1_handler(int a) +sigusr1_handler(int a, siginfo_t *info, void *b) { - dump_connection_list(); + dump_connections(); } RETSIGTYPE -sigusr2_handler(int a) +sigusr2_handler(int a, siginfo_t *info, void *b) { - dump_subnet_list(); + dump_device_stats(); + dump_nodes(); + dump_vertices(); + dump_subnets(); } RETSIGTYPE -sighuh(int a) +unexpected_signal_handler(int a, siginfo_t *info, void *b) { syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a)); cp_trace(); } +RETSIGTYPE +ignore_signal_handler(int a, siginfo_t *info, void *b) +{ + if(debug_lvl >= DEBUG_SCARY_THINGS) + { + syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a)); + cp_trace(); + } +} + +struct { + int signal; + void (*handler)(int, siginfo_t *, void *); +} sighandlers[] = { + { SIGHUP, sighup_handler }, + { SIGTERM, sigterm_handler }, + { SIGQUIT, sigquit_handler }, + { SIGSEGV, sigsegv_handler }, + { SIGPIPE, ignore_signal_handler }, + { SIGINT, sigint_handler }, + { SIGUSR1, sigusr1_handler }, + { SIGUSR2, sigusr2_handler }, + { SIGCHLD, ignore_signal_handler }, + { SIGALRM, ignore_signal_handler }, + { 0, NULL } +}; + void setup_signals(void) { int i; + struct sigaction act; - 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); -} + sigemptyset(&emptysigset); + act.sa_handler = NULL; + act.sa_mask = emptysigset; + act.sa_flags = SA_SIGINFO; -RETSIGTYPE parent_exit(int a) -{ - exit(0); + /* Set a default signal handler for every signal, errors will be + ignored. */ + for(i = 0; i < NSIG; i++) + { + act.sa_sigaction = unexpected_signal_handler; + sigaction(i, &act, NULL); + } + + /* 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_sigaction = 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)); + } }