2 Unix SMB/CIFS implementation.
3 Samba utility functions
5 Copyright (C) Andrew Tridgell 1992-2011
7 based on old fault.c code, which had:
9 Copyright (C) Jeremy Allison 2001-2007
10 Copyright (C) Simo Sorce 2001
11 Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
12 Copyright (C) James Peach 2006
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 3 of the License, or
17 (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with this program. If not, see <http://www.gnu.org/licenses/>.
30 static char *corepath;
33 * Build up the default corepath as "<logbase>/cores/<progname>"
35 static char *get_default_corepath(const char *logbase, const char *progname)
39 /* Setup core dir in logbase. */
40 tmp_corepath = talloc_asprintf(NULL, "%s/cores", logbase);
44 if ((mkdir(tmp_corepath, 0700) == -1) && errno != EEXIST)
47 if (chmod(tmp_corepath, 0700) == -1)
50 talloc_free(tmp_corepath);
52 /* Setup progname-specific core subdir */
53 tmp_corepath = talloc_asprintf(NULL, "%s/cores/%s", logbase, progname);
57 if (mkdir(tmp_corepath, 0700) == -1 && errno != EEXIST)
60 if (chown(tmp_corepath, getuid(), getgid()) == -1)
63 if (chmod(tmp_corepath, 0700) == -1)
69 talloc_free(tmp_corepath);
75 * Get the FreeBSD corepath.
77 * On FreeBSD the current working directory is ignored when creating a core
78 * file. Instead the core directory is controlled via sysctl. This consults
79 * the value of "kern.corefile" so the correct corepath can be printed out
80 * before dump_core() calls abort.
82 #if (defined(FREEBSD) && defined(HAVE_SYSCTLBYNAME))
83 static char *get_freebsd_corepath(void)
85 char *tmp_corepath = NULL;
90 /* Loop with increasing sizes so we don't allocate too much. */
96 tmp_corepath = (char *)talloc_realloc(NULL, tmp_corepath,
102 ret = sysctlbyname("kern.corefile", tmp_corepath, &len, NULL,
105 if (errno != ENOMEM) {
106 DEBUG(0, ("sysctlbyname failed getting "
107 "kern.corefile %s\n",
112 /* Not a large enough array, try a bigger one. */
117 /* Strip off the common filename expansion */
118 if ((end = strrchr_m(tmp_corepath, '/'))) {
126 talloc_free(tmp_corepath);
132 #if defined(HAVE_SYS_KERNEL_PROC_CORE_PATTERN)
135 * Get the Linux corepath.
137 * On Linux the contents of /proc/sys/kernel/core_pattern indicates the
138 * location of the core path.
140 static char *get_linux_corepath(void)
146 fd = open("/proc/sys/kernel/core_pattern", O_RDONLY, 0);
151 result = afdgets(fd, NULL, 0);
154 if (result == NULL) {
158 if (result[0] != '/') {
160 * No absolute path, use the default (cwd)
165 /* Strip off the common filename expansion */
167 end = strrchr_m(result, '/');
169 if ((end != result) /* this would be the only / */
179 * Try getting system-specific corepath if one exists.
181 * If the system doesn't define a corepath, then the default is used.
183 static char *get_corepath(const char *logbase, const char *progname)
185 #if (defined(FREEBSD) && defined(HAVE_SYSCTLBYNAME))
186 char *tmp_corepath = NULL;
187 tmp_corepath = get_freebsd_corepath();
189 /* If this has been set correctly, we're done. */
195 #if defined(HAVE_SYS_KERNEL_PROC_CORE_PATTERN)
196 char *tmp_corepath = NULL;
197 tmp_corepath = get_linux_corepath();
199 /* If this has been set correctly, we're done. */
205 /* Fall back to the default. */
206 return get_default_corepath(logbase, progname);
209 /*******************************************************************
210 make all the preparations to safely dump a core file
211 ********************************************************************/
213 void dump_core_setup(const char *progname, const char *logfile)
215 char *logbase = NULL;
218 if (logfile && *logfile) {
219 if (asprintf(&logbase, "%s", logfile) < 0) {
222 if ((end = strrchr_m(logbase, '/'))) {
226 /* We will end up here if the log file is given on the command
227 * line by the -l option but the "log file" option is not set
230 if (asprintf(&logbase, "%s", get_dyn_LOGFILEBASE()) < 0) {
235 SMB_ASSERT(progname != NULL);
237 corepath = get_corepath(logbase, progname);
239 DEBUG(0, ("Unable to setup corepath for %s: %s\n", progname,
245 #ifdef HAVE_GETRLIMIT
249 getrlimit(RLIMIT_CORE, &rlp);
250 rlp.rlim_cur = MAX(16*1024*1024,rlp.rlim_cur);
251 setrlimit(RLIMIT_CORE, &rlp);
252 getrlimit(RLIMIT_CORE, &rlp);
253 DEBUG(3,("Maximum core file size limits now %d(soft) %d(hard)\n",
254 (int)rlp.rlim_cur,(int)rlp.rlim_max));
259 /* FIXME: if we have a core-plus-pid facility, configurably set
271 DEBUG(0, ("dump_core() called recursive\n"));
276 /* Note that even if core dumping has been disabled, we still set up
277 * the core path. This is to handle the case where core dumping is
278 * turned on in smb.conf and the relevant daemon is not restarted.
280 if (!lp_enable_core_files()) {
281 DEBUG(0, ("Exiting on internal error (core file administratively disabled)\n"));
286 /* If we're running as non root we might not be able to dump the core
287 * file to the corepath. There must not be an unbecome_root() before
288 * we call abort(). */
289 if (geteuid() != sec_initial_uid()) {
293 if (corepath == NULL) {
294 DEBUG(0, ("Can not dump core: corepath not set up\n"));
298 if (*corepath != '\0') {
299 /* The chdir might fail if we dump core before we finish
300 * processing the config file.
302 if (chdir(corepath) != 0) {
303 DEBUG(0, ("unable to change to %s\n", corepath));
304 DEBUGADD(0, ("refusing to dump core\n"));
308 DEBUG(0,("dumping core in %s\n", corepath));
314 #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE)
315 /* On Linux we lose the ability to dump core when we change our user
316 * ID. We know how to dump core safely, so let's make sure we have our
319 prctl(PR_SET_DUMPABLE, 1);
322 /* Ensure we don't have a signal handler for abort. */
324 CatchSignal(SIGABRT, SIG_DFL);
329 #else /* DUMP_CORE */
331 #endif /* DUMP_CORE */