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Diffstat (limited to 'source3/lib/fault.c')
| -rw-r--r-- | source3/lib/fault.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/source3/lib/fault.c b/source3/lib/fault.c new file mode 100644 index 0000000000..d4c1142937 --- /dev/null +++ b/source3/lib/fault.c @@ -0,0 +1,223 @@ +/* + Unix SMB/CIFS implementation. + Critical Fault handling + Copyright (C) Andrew Tridgell 1992-1998 + + 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 3 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, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" + +#ifdef HAVE_SYS_PRCTL_H +#include <sys/prctl.h> +#endif + +static void (*cont_fn)(void *); +static char *corepath; + +/******************************************************************* +report a fault +********************************************************************/ +static void fault_report(int sig) +{ + static int counter; + + if (counter) _exit(1); + + counter++; + + DEBUGSEP(0); + DEBUG(0,("INTERNAL ERROR: Signal %d in pid %d (%s)",sig,(int)sys_getpid(),SAMBA_VERSION_STRING)); + DEBUG(0,("\nPlease read the Trouble-Shooting section of the Samba3-HOWTO\n")); + DEBUG(0,("\nFrom: http://www.samba.org/samba/docs/Samba3-HOWTO.pdf\n")); + DEBUGSEP(0); + + smb_panic("internal error"); + + if (cont_fn) { + cont_fn(NULL); +#ifdef SIGSEGV + CatchSignal(SIGSEGV,SIGNAL_CAST SIG_DFL); +#endif +#ifdef SIGBUS + CatchSignal(SIGBUS,SIGNAL_CAST SIG_DFL); +#endif +#ifdef SIGABRT + CatchSignal(SIGABRT,SIGNAL_CAST SIG_DFL); +#endif + return; /* this should cause a core dump */ + } + exit(1); +} + +/**************************************************************************** +catch serious errors +****************************************************************************/ +static void sig_fault(int sig) +{ + fault_report(sig); +} + +/******************************************************************* +setup our fault handlers +********************************************************************/ +void fault_setup(void (*fn)(void *)) +{ + cont_fn = fn; + +#ifdef SIGSEGV + CatchSignal(SIGSEGV,SIGNAL_CAST sig_fault); +#endif +#ifdef SIGBUS + CatchSignal(SIGBUS,SIGNAL_CAST sig_fault); +#endif +#ifdef SIGABRT + CatchSignal(SIGABRT,SIGNAL_CAST sig_fault); +#endif +} + +/******************************************************************* +make all the preparations to safely dump a core file +********************************************************************/ + +void dump_core_setup(const char *progname) +{ + char *logbase = NULL; + char *end = NULL; + + if (lp_logfile() && *lp_logfile()) { + if (asprintf(&logbase, "%s", lp_logfile()) < 0) { + return; + } + if ((end = strrchr_m(logbase, '/'))) { + *end = '\0'; + } + } else { + /* We will end up here is the log file is given on the command + * line by the -l option but the "log file" option is not set + * in smb.conf. + */ + if (asprintf(&logbase, "%s", get_dyn_LOGFILEBASE()) < 0) { + return; + } + } + + SMB_ASSERT(progname != NULL); + + if (asprintf(&corepath, "%s/cores", logbase) < 0) { + SAFE_FREE(logbase); + return; + } + mkdir(corepath,0700); + + SAFE_FREE(corepath); + if (asprintf(&corepath, "%s/cores/%s", + logbase, progname) < 0) { + SAFE_FREE(logbase); + return; + } + mkdir(corepath,0700); + + sys_chown(corepath,getuid(),getgid()); + chmod(corepath,0700); + + SAFE_FREE(logbase); + +#ifdef HAVE_GETRLIMIT +#ifdef RLIMIT_CORE + { + struct rlimit rlp; + getrlimit(RLIMIT_CORE, &rlp); + rlp.rlim_cur = MAX(16*1024*1024,rlp.rlim_cur); + setrlimit(RLIMIT_CORE, &rlp); + getrlimit(RLIMIT_CORE, &rlp); + DEBUG(3,("Maximum core file size limits now %d(soft) %d(hard)\n", + (int)rlp.rlim_cur,(int)rlp.rlim_max)); + } +#endif +#endif + +#if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) + /* On Linux we lose the ability to dump core when we change our user + * ID. We know how to dump core safely, so let's make sure we have our + * dumpable flag set. + */ + prctl(PR_SET_DUMPABLE, 1); +#endif + + /* FIXME: if we have a core-plus-pid facility, configurably set + * this up here. + */ +} + + void dump_core(void) +{ + static bool called; + + if (called) { + DEBUG(0, ("dump_core() called recursive\n")); + exit(1); + } + called = true; + + /* Note that even if core dumping has been disabled, we still set up + * the core path. This is to handle the case where core dumping is + * turned on in smb.conf and the relevant daemon is not restarted. + */ + if (!lp_enable_core_files()) { + DEBUG(0, ("Exiting on internal error (core file administratively disabled)\n")); + exit(1); + } + +#if DUMP_CORE + /* If we're running as non root we might not be able to dump the core + * file to the corepath. There must not be an unbecome_root() before + * we call abort(). */ + if (geteuid() != 0) { + become_root(); + } + + if (corepath == NULL) { + DEBUG(0, ("Can not dump core: corepath not set up\n")); + exit(1); + } + + if (*corepath != '\0') { + /* The chdir might fail if we dump core before we finish + * processing the config file. + */ + if (chdir(corepath) != 0) { + DEBUG(0, ("unable to change to %s\n", corepath)); + DEBUGADD(0, ("refusing to dump core\n")); + exit(1); + } + + DEBUG(0,("dumping core in %s\n", corepath)); + } + + umask(~(0700)); + dbgflush(); + + /* Ensure we don't have a signal handler for abort. */ +#ifdef SIGABRT + CatchSignal(SIGABRT,SIGNAL_CAST SIG_DFL); +#endif + + abort(); + +#else /* DUMP_CORE */ + exit(1); +#endif /* DUMP_CORE */ +} + |