s4:rootdse LDB module - remove unused variable
[Samba/gebeck_regimport.git] / source3 / lib / fault.c
blobdd87ae110062e0c790b9028a5cd386e6d71631ce
1 /*
2 Unix SMB/CIFS implementation.
3 Critical Fault handling
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Tim Prouty 2009
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include "includes.h"
23 #ifdef HAVE_SYS_SYSCTL_H
24 #include <sys/sysctl.h>
25 #endif
28 #ifdef HAVE_SYS_PRCTL_H
29 #include <sys/prctl.h>
30 #endif
32 static void (*cont_fn)(void *);
33 static char *corepath;
35 /*******************************************************************
36 report a fault
37 ********************************************************************/
38 static void fault_report(int sig)
40 static int counter;
42 if (counter) _exit(1);
44 counter++;
46 DEBUGSEP(0);
47 DEBUG(0,("INTERNAL ERROR: Signal %d in pid %d (%s)",sig,(int)sys_getpid(),samba_version_string()));
48 DEBUG(0,("\nPlease read the Trouble-Shooting section of the Samba3-HOWTO\n"));
49 DEBUG(0,("\nFrom: http://www.samba.org/samba/docs/Samba3-HOWTO.pdf\n"));
50 DEBUGSEP(0);
52 smb_panic("internal error");
54 if (cont_fn) {
55 cont_fn(NULL);
56 #ifdef SIGSEGV
57 CatchSignal(SIGSEGV, SIG_DFL);
58 #endif
59 #ifdef SIGBUS
60 CatchSignal(SIGBUS, SIG_DFL);
61 #endif
62 #ifdef SIGABRT
63 CatchSignal(SIGABRT, SIG_DFL);
64 #endif
65 return; /* this should cause a core dump */
67 exit(1);
70 /****************************************************************************
71 catch serious errors
72 ****************************************************************************/
73 static void sig_fault(int sig)
75 fault_report(sig);
78 /*******************************************************************
79 setup our fault handlers
80 ********************************************************************/
81 void fault_setup(void (*fn)(void *))
83 cont_fn = fn;
85 #ifdef SIGSEGV
86 CatchSignal(SIGSEGV, sig_fault);
87 #endif
88 #ifdef SIGBUS
89 CatchSignal(SIGBUS, sig_fault);
90 #endif
91 #ifdef SIGABRT
92 CatchSignal(SIGABRT, sig_fault);
93 #endif
96 /**
97 * Build up the default corepath as "<logbase>/cores/<progname>"
99 static char *get_default_corepath(const char *logbase, const char *progname)
101 char *tmp_corepath;
103 /* Setup core dir in logbase. */
104 tmp_corepath = talloc_asprintf(NULL, "%s/cores", logbase);
105 if (!tmp_corepath)
106 return NULL;
108 if ((mkdir(tmp_corepath, 0700) == -1) && errno != EEXIST)
109 goto err_out;
111 if (chmod(tmp_corepath, 0700) == -1)
112 goto err_out;
114 talloc_free(tmp_corepath);
116 /* Setup progname-specific core subdir */
117 tmp_corepath = talloc_asprintf(NULL, "%s/cores/%s", logbase, progname);
118 if (!tmp_corepath)
119 return NULL;
121 if (mkdir(tmp_corepath, 0700) == -1 && errno != EEXIST)
122 goto err_out;
124 if (chown(tmp_corepath, getuid(), getgid()) == -1)
125 goto err_out;
127 if (chmod(tmp_corepath, 0700) == -1)
128 goto err_out;
130 return tmp_corepath;
132 err_out:
133 talloc_free(tmp_corepath);
134 return NULL;
138 * Get the FreeBSD corepath.
140 * On FreeBSD the current working directory is ignored when creating a core
141 * file. Instead the core directory is controlled via sysctl. This consults
142 * the value of "kern.corefile" so the correct corepath can be printed out
143 * before dump_core() calls abort.
145 #if (defined(FREEBSD) && defined(HAVE_SYSCTLBYNAME))
146 static char *get_freebsd_corepath(void)
148 char *tmp_corepath = NULL;
149 char *end = NULL;
150 size_t len = 128;
151 int ret;
153 /* Loop with increasing sizes so we don't allocate too much. */
154 do {
155 if (len > 1024) {
156 goto err_out;
159 tmp_corepath = (char *)talloc_realloc(NULL, tmp_corepath,
160 char, len);
161 if (!tmp_corepath) {
162 return NULL;
165 ret = sysctlbyname("kern.corefile", tmp_corepath, &len, NULL,
167 if (ret == -1) {
168 if (errno != ENOMEM) {
169 DEBUG(0, ("sysctlbyname failed getting "
170 "kern.corefile %s\n",
171 strerror(errno)));
172 goto err_out;
175 /* Not a large enough array, try a bigger one. */
176 len = len << 1;
178 } while (ret == -1);
180 /* Strip off the common filename expansion */
181 if ((end = strrchr_m(tmp_corepath, '/'))) {
182 *end = '\0';
185 return tmp_corepath;
187 err_out:
188 if (tmp_corepath) {
189 talloc_free(tmp_corepath);
191 return NULL;
193 #endif
195 #if defined(HAVE_SYS_KERNEL_PROC_CORE_PATTERN)
198 * Get the Linux corepath.
200 * On Linux the contents of /proc/sys/kernel/core_pattern indicates the
201 * location of the core path.
203 static char *get_linux_corepath(void)
205 char *end;
206 int fd;
207 char *result;
209 fd = open("/proc/sys/kernel/core_pattern", O_RDONLY, 0);
210 if (fd == -1) {
211 return NULL;
214 result = afdgets(fd, NULL, 0);
215 close(fd);
217 if (result == NULL) {
218 return NULL;
221 if (result[0] != '/') {
223 * No absolute path, use the default (cwd)
225 TALLOC_FREE(result);
226 return NULL;
228 /* Strip off the common filename expansion */
230 end = strrchr_m(result, '/');
232 if ((end != result) /* this would be the only / */
233 && (end != NULL)) {
234 *end = '\0';
236 return result;
238 #endif
242 * Try getting system-specific corepath if one exists.
244 * If the system doesn't define a corepath, then the default is used.
246 static char *get_corepath(const char *logbase, const char *progname)
248 #if (defined(FREEBSD) && defined(HAVE_SYSCTLBYNAME))
249 char *tmp_corepath = NULL;
250 tmp_corepath = get_freebsd_corepath();
252 /* If this has been set correctly, we're done. */
253 if (tmp_corepath) {
254 return tmp_corepath;
256 #endif
258 #if defined(HAVE_SYS_KERNEL_PROC_CORE_PATTERN)
259 char *tmp_corepath = NULL;
260 tmp_corepath = get_linux_corepath();
262 /* If this has been set correctly, we're done. */
263 if (tmp_corepath) {
264 return tmp_corepath;
266 #endif
268 /* Fall back to the default. */
269 return get_default_corepath(logbase, progname);
272 /*******************************************************************
273 make all the preparations to safely dump a core file
274 ********************************************************************/
276 void dump_core_setup(const char *progname)
278 char *logbase = NULL;
279 char *end = NULL;
281 if (lp_logfile() && *lp_logfile()) {
282 if (asprintf(&logbase, "%s", lp_logfile()) < 0) {
283 return;
285 if ((end = strrchr_m(logbase, '/'))) {
286 *end = '\0';
288 } else {
289 /* We will end up here if the log file is given on the command
290 * line by the -l option but the "log file" option is not set
291 * in smb.conf.
293 if (asprintf(&logbase, "%s", get_dyn_LOGFILEBASE()) < 0) {
294 return;
298 SMB_ASSERT(progname != NULL);
300 corepath = get_corepath(logbase, progname);
301 if (!corepath) {
302 DEBUG(0, ("Unable to setup corepath for %s: %s\n", progname,
303 strerror(errno)));
304 goto out;
308 #ifdef HAVE_GETRLIMIT
309 #ifdef RLIMIT_CORE
311 struct rlimit rlp;
312 getrlimit(RLIMIT_CORE, &rlp);
313 rlp.rlim_cur = MAX(16*1024*1024,rlp.rlim_cur);
314 setrlimit(RLIMIT_CORE, &rlp);
315 getrlimit(RLIMIT_CORE, &rlp);
316 DEBUG(3,("Maximum core file size limits now %d(soft) %d(hard)\n",
317 (int)rlp.rlim_cur,(int)rlp.rlim_max));
319 #endif
320 #endif
322 /* FIXME: if we have a core-plus-pid facility, configurably set
323 * this up here.
325 out:
326 SAFE_FREE(logbase);
329 void dump_core(void)
331 static bool called;
333 if (called) {
334 DEBUG(0, ("dump_core() called recursive\n"));
335 exit(1);
337 called = true;
339 /* Note that even if core dumping has been disabled, we still set up
340 * the core path. This is to handle the case where core dumping is
341 * turned on in smb.conf and the relevant daemon is not restarted.
343 if (!lp_enable_core_files()) {
344 DEBUG(0, ("Exiting on internal error (core file administratively disabled)\n"));
345 exit(1);
348 #if DUMP_CORE
349 /* If we're running as non root we might not be able to dump the core
350 * file to the corepath. There must not be an unbecome_root() before
351 * we call abort(). */
352 if (geteuid() != sec_initial_uid()) {
353 become_root();
356 if (corepath == NULL) {
357 DEBUG(0, ("Can not dump core: corepath not set up\n"));
358 exit(1);
361 if (*corepath != '\0') {
362 /* The chdir might fail if we dump core before we finish
363 * processing the config file.
365 if (chdir(corepath) != 0) {
366 DEBUG(0, ("unable to change to %s\n", corepath));
367 DEBUGADD(0, ("refusing to dump core\n"));
368 exit(1);
371 DEBUG(0,("dumping core in %s\n", corepath));
374 umask(~(0700));
375 dbgflush();
377 #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE)
378 /* On Linux we lose the ability to dump core when we change our user
379 * ID. We know how to dump core safely, so let's make sure we have our
380 * dumpable flag set.
382 prctl(PR_SET_DUMPABLE, 1);
383 #endif
385 /* Ensure we don't have a signal handler for abort. */
386 #ifdef SIGABRT
387 CatchSignal(SIGABRT, SIG_DFL);
388 #endif
390 abort();
392 #else /* DUMP_CORE */
393 exit(1);
394 #endif /* DUMP_CORE */