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authorAndrew Tridgell <tridge@samba.org>2011-03-22 16:17:39 +1100
committerAndrew Tridgell <tridge@samba.org>2011-03-23 11:03:57 +1100
commit580997ede06d587ecf00c6a3faff237806904cd3 (patch)
tree73e5ce8019ded546a2630703aa91bd0f41b567c5 /lib/util/fault.c
parent058c3bb923c51ef3f1b4b6d698bea2b1220bdd10 (diff)
downloadsamba-580997ede06d587ecf00c6a3faff237806904cd3.tar.gz
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fault: get fault.c ready for use by s4
this moves the s3 specific dumpcore code into source3/lib/dumpcore.c, and uses a function pointer to setup which smb_panic call to use
Diffstat (limited to 'lib/util/fault.c')
-rw-r--r--lib/util/fault.c360
1 files changed, 67 insertions, 293 deletions
diff --git a/lib/util/fault.c b/lib/util/fault.c
index 2ffd5dbd6d..086dc33545 100644
--- a/lib/util/fault.c
+++ b/lib/util/fault.c
@@ -19,6 +19,8 @@
*/
#include "includes.h"
+#include "system/filesys.h"
+#include "version.h"
#ifdef HAVE_SYS_SYSCTL_H
#include <sys/sysctl.h>
@@ -29,7 +31,32 @@
#include <sys/prctl.h>
#endif
-static char *corepath;
+static struct {
+ bool disabled;
+ smb_panic_handler_t panic_handler;
+} fault_state;
+
+
+/*******************************************************************
+setup variables used for fault handling
+********************************************************************/
+void fault_configure(smb_panic_handler_t panic_handler)
+{
+ fault_state.panic_handler = panic_handler;
+}
+
+
+/**
+ disable setting up fault handlers
+ This is used for the bind9 dlz module, as we
+ don't want a Samba module in bind9 to override the bind
+ fault handling
+**/
+_PUBLIC_ void fault_setup_disable(void)
+{
+ fault_state.disabled = true;
+}
+
/*******************************************************************
report a fault
@@ -43,9 +70,8 @@ static void fault_report(int sig)
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"));
+ 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 Samba HOWTO\n"));
DEBUGSEP(0);
smb_panic("internal error");
@@ -67,6 +93,9 @@ setup our fault handlers
********************************************************************/
void fault_setup(void)
{
+ if (fault_state.disabled) {
+ return;
+ }
#ifdef SIGSEGV
CatchSignal(SIGSEGV, sig_fault);
#endif
@@ -78,303 +107,48 @@ void fault_setup(void)
#endif
}
-/**
- * Build up the default corepath as "<logbase>/cores/<progname>"
- */
-static char *get_default_corepath(const char *logbase, const char *progname)
-{
- char *tmp_corepath;
-
- /* Setup core dir in logbase. */
- tmp_corepath = talloc_asprintf(NULL, "%s/cores", logbase);
- if (!tmp_corepath)
- return NULL;
-
- if ((mkdir(tmp_corepath, 0700) == -1) && errno != EEXIST)
- goto err_out;
-
- if (chmod(tmp_corepath, 0700) == -1)
- goto err_out;
-
- talloc_free(tmp_corepath);
-
- /* Setup progname-specific core subdir */
- tmp_corepath = talloc_asprintf(NULL, "%s/cores/%s", logbase, progname);
- if (!tmp_corepath)
- return NULL;
-
- if (mkdir(tmp_corepath, 0700) == -1 && errno != EEXIST)
- goto err_out;
+_PUBLIC_ const char *panic_action = NULL;
- if (chown(tmp_corepath, getuid(), getgid()) == -1)
- goto err_out;
-
- if (chmod(tmp_corepath, 0700) == -1)
- goto err_out;
-
- return tmp_corepath;
-
- err_out:
- talloc_free(tmp_corepath);
- return NULL;
-}
-
-/**
- * Get the FreeBSD corepath.
- *
- * On FreeBSD the current working directory is ignored when creating a core
- * file. Instead the core directory is controlled via sysctl. This consults
- * the value of "kern.corefile" so the correct corepath can be printed out
- * before dump_core() calls abort.
- */
-#if (defined(FREEBSD) && defined(HAVE_SYSCTLBYNAME))
-static char *get_freebsd_corepath(void)
+/*
+ default smb_panic() implementation
+*/
+static void smb_panic_default(const char *why)
{
- char *tmp_corepath = NULL;
- char *end = NULL;
- size_t len = 128;
- int ret;
-
- /* Loop with increasing sizes so we don't allocate too much. */
- do {
- if (len > 1024) {
- goto err_out;
- }
-
- tmp_corepath = (char *)talloc_realloc(NULL, tmp_corepath,
- char, len);
- if (!tmp_corepath) {
- return NULL;
- }
+ int result;
+
+ if (panic_action && *panic_action) {
+ char pidstr[20];
+ char cmdstring[200];
+ safe_strcpy(cmdstring, panic_action, sizeof(cmdstring)-1);
+ snprintf(pidstr, sizeof(pidstr), "%d", (int) getpid());
+ all_string_sub(cmdstring, "%PID%", pidstr, sizeof(cmdstring));
+ DEBUG(0, ("smb_panic(): calling panic action [%s]\n", cmdstring));
+ result = system(cmdstring);
+
+ if (result == -1)
+ DEBUG(0, ("smb_panic(): fork failed in panic action: %s\n",
+ strerror(errno)));
+ else
+ DEBUG(0, ("smb_panic(): action returned status %d\n",
+ WEXITSTATUS(result)));
+ }
+ DEBUG(0,("PANIC: %s\n", why));
- ret = sysctlbyname("kern.corefile", tmp_corepath, &len, NULL,
- 0);
- if (ret == -1) {
- if (errno != ENOMEM) {
- DEBUG(0, ("sysctlbyname failed getting "
- "kern.corefile %s\n",
- strerror(errno)));
- goto err_out;
- }
-
- /* Not a large enough array, try a bigger one. */
- len = len << 1;
- }
- } while (ret == -1);
-
- /* Strip off the common filename expansion */
- if ((end = strrchr_m(tmp_corepath, '/'))) {
- *end = '\0';
- }
-
- return tmp_corepath;
-
- err_out:
- if (tmp_corepath) {
- talloc_free(tmp_corepath);
- }
- return NULL;
-}
+#ifdef SIGABRT
+ CatchSignal(SIGABRT, SIG_DFL);
#endif
-
-#if defined(HAVE_SYS_KERNEL_PROC_CORE_PATTERN)
-
-/**
- * Get the Linux corepath.
- *
- * On Linux the contents of /proc/sys/kernel/core_pattern indicates the
- * location of the core path.
- */
-static char *get_linux_corepath(void)
-{
- char *end;
- int fd;
- char *result;
-
- fd = open("/proc/sys/kernel/core_pattern", O_RDONLY, 0);
- if (fd == -1) {
- return NULL;
- }
-
- result = afdgets(fd, NULL, 0);
- close(fd);
-
- if (result == NULL) {
- return NULL;
- }
-
- if (result[0] != '/') {
- /*
- * No absolute path, use the default (cwd)
- */
- TALLOC_FREE(result);
- return NULL;
- }
- /* Strip off the common filename expansion */
-
- end = strrchr_m(result, '/');
-
- if ((end != result) /* this would be the only / */
- && (end != NULL)) {
- *end = '\0';
- }
- return result;
+ abort();
}
-#endif
/**
- * Try getting system-specific corepath if one exists.
- *
- * If the system doesn't define a corepath, then the default is used.
- */
-static char *get_corepath(const char *logbase, const char *progname)
-{
-#if (defined(FREEBSD) && defined(HAVE_SYSCTLBYNAME))
- char *tmp_corepath = NULL;
- tmp_corepath = get_freebsd_corepath();
-
- /* If this has been set correctly, we're done. */
- if (tmp_corepath) {
- return tmp_corepath;
- }
-#endif
-
-#if defined(HAVE_SYS_KERNEL_PROC_CORE_PATTERN)
- char *tmp_corepath = NULL;
- tmp_corepath = get_linux_corepath();
-
- /* If this has been set correctly, we're done. */
- if (tmp_corepath) {
- return tmp_corepath;
- }
-#endif
-
- /* Fall back to the default. */
- return get_default_corepath(logbase, progname);
-}
-
-/*******************************************************************
-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 if 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);
-
- corepath = get_corepath(logbase, progname);
- if (!corepath) {
- DEBUG(0, ("Unable to setup corepath for %s: %s\n", progname,
- strerror(errno)));
- goto out;
- }
-
-
-#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
-
- /* FIXME: if we have a core-plus-pid facility, configurably set
- * this up here.
- */
- out:
- SAFE_FREE(logbase);
-}
-
- void dump_core(void)
+ Something really nasty happened - panic !
+**/
+_PUBLIC_ void smb_panic(const char *why)
{
- 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() != sec_initial_uid()) {
- 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));
+ if (fault_state.panic_handler) {
+ fault_state.panic_handler(why);
+ _exit(1);
}
-
- umask(~(0700));
- dbgflush();
-
-#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
-
- /* Ensure we don't have a signal handler for abort. */
-#ifdef SIGABRT
- CatchSignal(SIGABRT, SIG_DFL);
-#endif
-
- abort();
-
-#else /* DUMP_CORE */
- exit(1);
-#endif /* DUMP_CORE */
+ smb_panic_default(why);
}