mirror of
https://github.com/samba-team/samba.git
synced 2025-08-03 04:22:09 +03:00
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
This commit is contained in:
Andrew Tridgell
362
lib/util/fault.c
362
lib/util/fault.c
@ -19,6 +19,8 @@
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*/
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#include "includes.h"
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#include "system/filesys.h"
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#include "version.h"
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#ifdef HAVE_SYS_SYSCTL_H
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#include <sys/sysctl.h>
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@ -29,7 +31,32 @@
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#include <sys/prctl.h>
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#endif
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static char *corepath;
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static struct {
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bool disabled;
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smb_panic_handler_t panic_handler;
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} fault_state;
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/*******************************************************************
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setup variables used for fault handling
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********************************************************************/
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void fault_configure(smb_panic_handler_t panic_handler)
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{
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fault_state.panic_handler = panic_handler;
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}
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/**
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disable setting up fault handlers
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This is used for the bind9 dlz module, as we
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don't want a Samba module in bind9 to override the bind
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fault handling
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**/
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_PUBLIC_ void fault_setup_disable(void)
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{
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fault_state.disabled = true;
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}
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/*******************************************************************
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report a fault
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@ -43,9 +70,8 @@ static void fault_report(int sig)
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counter++;
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DEBUGSEP(0);
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DEBUG(0,("INTERNAL ERROR: Signal %d in pid %d (%s)",sig,(int)sys_getpid(),samba_version_string()));
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DEBUG(0,("\nPlease read the Trouble-Shooting section of the Samba3-HOWTO\n"));
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DEBUG(0,("\nFrom: http://www.samba.org/samba/docs/Samba3-HOWTO.pdf\n"));
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DEBUG(0,("INTERNAL ERROR: Signal %d in pid %d (%s)",sig,(int)sys_getpid(),SAMBA_VERSION_STRING));
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DEBUG(0,("\nPlease read the Trouble-Shooting section of the Samba HOWTO\n"));
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DEBUGSEP(0);
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smb_panic("internal error");
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@ -67,6 +93,9 @@ setup our fault handlers
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********************************************************************/
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void fault_setup(void)
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{
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if (fault_state.disabled) {
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return;
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}
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#ifdef SIGSEGV
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CatchSignal(SIGSEGV, sig_fault);
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#endif
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@ -78,303 +107,48 @@ void fault_setup(void)
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#endif
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}
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/**
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* Build up the default corepath as "<logbase>/cores/<progname>"
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*/
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static char *get_default_corepath(const char *logbase, const char *progname)
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_PUBLIC_ const char *panic_action = NULL;
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/*
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default smb_panic() implementation
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*/
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static void smb_panic_default(const char *why)
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{
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char *tmp_corepath;
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int result;
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/* Setup core dir in logbase. */
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tmp_corepath = talloc_asprintf(NULL, "%s/cores", logbase);
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if (!tmp_corepath)
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return NULL;
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if (panic_action && *panic_action) {
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char pidstr[20];
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char cmdstring[200];
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safe_strcpy(cmdstring, panic_action, sizeof(cmdstring)-1);
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snprintf(pidstr, sizeof(pidstr), "%d", (int) getpid());
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all_string_sub(cmdstring, "%PID%", pidstr, sizeof(cmdstring));
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DEBUG(0, ("smb_panic(): calling panic action [%s]\n", cmdstring));
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result = system(cmdstring);
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if ((mkdir(tmp_corepath, 0700) == -1) && errno != EEXIST)
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goto err_out;
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if (chmod(tmp_corepath, 0700) == -1)
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goto err_out;
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talloc_free(tmp_corepath);
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/* Setup progname-specific core subdir */
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tmp_corepath = talloc_asprintf(NULL, "%s/cores/%s", logbase, progname);
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if (!tmp_corepath)
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return NULL;
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if (mkdir(tmp_corepath, 0700) == -1 && errno != EEXIST)
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goto err_out;
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if (chown(tmp_corepath, getuid(), getgid()) == -1)
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goto err_out;
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if (chmod(tmp_corepath, 0700) == -1)
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goto err_out;
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return tmp_corepath;
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err_out:
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talloc_free(tmp_corepath);
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return NULL;
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}
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/**
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* Get the FreeBSD corepath.
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*
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* On FreeBSD the current working directory is ignored when creating a core
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* file. Instead the core directory is controlled via sysctl. This consults
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* the value of "kern.corefile" so the correct corepath can be printed out
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* before dump_core() calls abort.
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*/
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#if (defined(FREEBSD) && defined(HAVE_SYSCTLBYNAME))
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static char *get_freebsd_corepath(void)
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{
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char *tmp_corepath = NULL;
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char *end = NULL;
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size_t len = 128;
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int ret;
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/* Loop with increasing sizes so we don't allocate too much. */
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do {
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if (len > 1024) {
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goto err_out;
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}
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tmp_corepath = (char *)talloc_realloc(NULL, tmp_corepath,
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char, len);
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if (!tmp_corepath) {
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return NULL;
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}
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ret = sysctlbyname("kern.corefile", tmp_corepath, &len, NULL,
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0);
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if (ret == -1) {
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if (errno != ENOMEM) {
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DEBUG(0, ("sysctlbyname failed getting "
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"kern.corefile %s\n",
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strerror(errno)));
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goto err_out;
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}
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/* Not a large enough array, try a bigger one. */
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len = len << 1;
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}
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} while (ret == -1);
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/* Strip off the common filename expansion */
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if ((end = strrchr_m(tmp_corepath, '/'))) {
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*end = '\0';
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if (result == -1)
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DEBUG(0, ("smb_panic(): fork failed in panic action: %s\n",
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strerror(errno)));
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else
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DEBUG(0, ("smb_panic(): action returned status %d\n",
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WEXITSTATUS(result)));
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}
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DEBUG(0,("PANIC: %s\n", why));
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return tmp_corepath;
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err_out:
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if (tmp_corepath) {
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talloc_free(tmp_corepath);
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}
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return NULL;
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}
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#endif
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#if defined(HAVE_SYS_KERNEL_PROC_CORE_PATTERN)
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/**
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* Get the Linux corepath.
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*
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* On Linux the contents of /proc/sys/kernel/core_pattern indicates the
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* location of the core path.
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*/
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static char *get_linux_corepath(void)
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{
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char *end;
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int fd;
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char *result;
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fd = open("/proc/sys/kernel/core_pattern", O_RDONLY, 0);
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if (fd == -1) {
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return NULL;
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}
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result = afdgets(fd, NULL, 0);
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close(fd);
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if (result == NULL) {
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return NULL;
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}
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if (result[0] != '/') {
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/*
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* No absolute path, use the default (cwd)
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*/
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TALLOC_FREE(result);
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return NULL;
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}
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/* Strip off the common filename expansion */
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end = strrchr_m(result, '/');
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if ((end != result) /* this would be the only / */
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&& (end != NULL)) {
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*end = '\0';
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}
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return result;
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}
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#endif
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/**
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* Try getting system-specific corepath if one exists.
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*
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* If the system doesn't define a corepath, then the default is used.
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*/
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static char *get_corepath(const char *logbase, const char *progname)
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{
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#if (defined(FREEBSD) && defined(HAVE_SYSCTLBYNAME))
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char *tmp_corepath = NULL;
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tmp_corepath = get_freebsd_corepath();
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/* If this has been set correctly, we're done. */
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if (tmp_corepath) {
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return tmp_corepath;
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}
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#endif
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#if defined(HAVE_SYS_KERNEL_PROC_CORE_PATTERN)
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char *tmp_corepath = NULL;
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tmp_corepath = get_linux_corepath();
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/* If this has been set correctly, we're done. */
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if (tmp_corepath) {
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return tmp_corepath;
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}
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#endif
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/* Fall back to the default. */
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return get_default_corepath(logbase, progname);
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}
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/*******************************************************************
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make all the preparations to safely dump a core file
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********************************************************************/
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void dump_core_setup(const char *progname)
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{
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char *logbase = NULL;
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char *end = NULL;
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if (lp_logfile() && *lp_logfile()) {
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if (asprintf(&logbase, "%s", lp_logfile()) < 0) {
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return;
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}
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if ((end = strrchr_m(logbase, '/'))) {
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*end = '\0';
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}
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} else {
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/* We will end up here if the log file is given on the command
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* line by the -l option but the "log file" option is not set
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* in smb.conf.
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*/
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if (asprintf(&logbase, "%s", get_dyn_LOGFILEBASE()) < 0) {
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return;
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}
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}
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SMB_ASSERT(progname != NULL);
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corepath = get_corepath(logbase, progname);
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if (!corepath) {
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DEBUG(0, ("Unable to setup corepath for %s: %s\n", progname,
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strerror(errno)));
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goto out;
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}
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#ifdef HAVE_GETRLIMIT
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#ifdef RLIMIT_CORE
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{
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struct rlimit rlp;
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getrlimit(RLIMIT_CORE, &rlp);
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rlp.rlim_cur = MAX(16*1024*1024,rlp.rlim_cur);
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setrlimit(RLIMIT_CORE, &rlp);
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getrlimit(RLIMIT_CORE, &rlp);
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DEBUG(3,("Maximum core file size limits now %d(soft) %d(hard)\n",
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(int)rlp.rlim_cur,(int)rlp.rlim_max));
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}
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#endif
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#endif
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/* FIXME: if we have a core-plus-pid facility, configurably set
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* this up here.
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*/
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out:
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SAFE_FREE(logbase);
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}
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void dump_core(void)
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{
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static bool called;
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if (called) {
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DEBUG(0, ("dump_core() called recursive\n"));
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exit(1);
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}
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called = true;
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/* Note that even if core dumping has been disabled, we still set up
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* the core path. This is to handle the case where core dumping is
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* turned on in smb.conf and the relevant daemon is not restarted.
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*/
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if (!lp_enable_core_files()) {
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DEBUG(0, ("Exiting on internal error (core file administratively disabled)\n"));
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exit(1);
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}
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#if DUMP_CORE
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/* If we're running as non root we might not be able to dump the core
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* file to the corepath. There must not be an unbecome_root() before
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* we call abort(). */
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if (geteuid() != sec_initial_uid()) {
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become_root();
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}
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if (corepath == NULL) {
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DEBUG(0, ("Can not dump core: corepath not set up\n"));
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exit(1);
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}
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if (*corepath != '\0') {
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/* The chdir might fail if we dump core before we finish
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* processing the config file.
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*/
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if (chdir(corepath) != 0) {
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DEBUG(0, ("unable to change to %s\n", corepath));
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DEBUGADD(0, ("refusing to dump core\n"));
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exit(1);
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}
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DEBUG(0,("dumping core in %s\n", corepath));
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}
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umask(~(0700));
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dbgflush();
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#if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE)
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/* On Linux we lose the ability to dump core when we change our user
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* ID. We know how to dump core safely, so let's make sure we have our
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* dumpable flag set.
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*/
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prctl(PR_SET_DUMPABLE, 1);
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#endif
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/* Ensure we don't have a signal handler for abort. */
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#ifdef SIGABRT
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CatchSignal(SIGABRT, SIG_DFL);
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#endif
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abort();
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#else /* DUMP_CORE */
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exit(1);
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#endif /* DUMP_CORE */
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}
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/**
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Something really nasty happened - panic !
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**/
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_PUBLIC_ void smb_panic(const char *why)
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{
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if (fault_state.panic_handler) {
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fault_state.panic_handler(why);
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_exit(1);
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}
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smb_panic_default(why);
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}
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