diff options
Diffstat (limited to 'server/util/server.c')
| -rw-r--r-- | server/util/server.c | 433 |
1 files changed, 0 insertions, 433 deletions
diff --git a/server/util/server.c b/server/util/server.c deleted file mode 100644 index fd6c46531..000000000 --- a/server/util/server.c +++ /dev/null @@ -1,433 +0,0 @@ -/* - SSSD - - Servers setup routines - - Copyright (C) Andrew Tridgell 1992-2005 - Copyright (C) Martin Pool 2002 - Copyright (C) Jelmer Vernooij 2002 - Copyright (C) James J Myers 2003 <myersjj@samba.org> - Copyright (C) Simo Sorce 2008 - - 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/>. -*/ - -#define _GNU_SOURCE -#include <sys/types.h> -#include <sys/stat.h> -#include <fcntl.h> -#include <unistd.h> -#include "util/util.h" -#include "ldb.h" -#include "confdb/confdb.h" - -#ifdef HAVE_PRCTL -#include <sys/prctl.h> -#endif - -/******************************************************************* - Close the low 3 fd's and open dev/null in their place. -********************************************************************/ -static void close_low_fds(void) -{ -#ifndef VALGRIND - int fd; - int i; - - close(0); - close(1); - close(2); - - /* try and use up these file descriptors, so silly - library routines writing to stdout etc won't cause havoc */ - for (i=0;i<3;i++) { - fd = open("/dev/null",O_RDWR,0); - if (fd < 0) - fd = open("/dev/null",O_WRONLY,0); - if (fd < 0) { - DEBUG(0,("Can't open /dev/null\n")); - return; - } - if (fd != i) { - DEBUG(0,("Didn't get file descriptor %d\n",i)); - return; - } - } -#endif -} - -/** - Become a daemon, discarding the controlling terminal. -**/ - -void become_daemon(bool Fork) -{ - int ret; - - if (Fork) { - if (fork()) { - _exit(0); - } - } - - /* detach from the terminal */ - setsid(); - - /* chdir to / to be sure we're not on a remote filesystem */ - errno = 0; - if(chdir("/") == -1) { - ret = errno; - DEBUG(0, ("Cannot change directory (%d [%s])\n", - ret, strerror(ret))); - return; - } - - /* Close fd's 0,1,2. Needed if started by rsh */ - close_low_fds(); -} - -int pidfile(const char *path, const char *name) -{ - char pid_str[32]; - pid_t pid; - char *file; - int fd; - int ret, err; - - file = talloc_asprintf(NULL, "%s/%s.pid", path, name); - if (!file) { - return ENOMEM; - } - - fd = open(file, O_RDONLY, 0644); - err = errno; - if (fd != -1) { - - pid_str[sizeof(pid_str) -1] = '\0'; - ret = read(fd, pid_str, sizeof(pid_str) -1); - if (ret > 0) { - /* let's check the pid */ - - pid = (pid_t)atoi(pid_str); - if (pid != 0) { - errno = 0; - ret = kill(pid, 0); - /* succeeded in signaling the process -> another sssd process */ - if (ret == 0) { - close(fd); - talloc_free(file); - return EEXIST; - } - if (ret != 0 && errno != ESRCH) { - err = errno; - close(fd); - talloc_free(file); - return err; - } - } - } - - /* nothing in the file or no process */ - close(fd); - unlink(file); - - } else { - if (err != ENOENT) { - talloc_free(file); - return err; - } - } - - fd = open(file, O_CREAT | O_WRONLY | O_EXCL, 0644); - err = errno; - if (fd == -1) { - talloc_free(file); - return err; - } - talloc_free(file); - - memset(pid_str, 0, sizeof(pid_str)); - snprintf(pid_str, sizeof(pid_str) -1, "%u\n", (unsigned int) getpid()); - - ret = write(fd, pid_str, strlen(pid_str)); - err = errno; - if (ret != strlen(pid_str)) { - close(fd); - return err; - } - - close(fd); - - return 0; -} - -static void sig_hup(int sig) -{ - /* cycle log/debug files */ - return; -} - -static void sig_term(int sig) -{ -#if HAVE_GETPGRP - static int done_sigterm; - if (done_sigterm == 0 && getpgrp() == getpid()) { - DEBUG(0,("SIGTERM: killing children\n")); - done_sigterm = 1; - kill(-getpgrp(), SIGTERM); - } -#endif - exit(0); -} - -#ifndef HAVE_PRCTL -static void sig_segv_abrt(int sig) -{ -#if HAVE_GETPGRP - static int done; - if (done == 0 && getpgrp() == getpid()) { - DEBUG(0,("%s: killing children\n", strsignal(sig))); - done = 1; - kill(-getpgrp(), SIGTERM); - } -#endif /* HAVE_GETPGRP */ - exit(1); -} -#endif /* HAVE_PRCTL */ - -/* - setup signal masks -*/ -static void setup_signals(void) -{ - /* we are never interested in SIGPIPE */ - BlockSignals(true, SIGPIPE); - -#if defined(SIGFPE) - /* we are never interested in SIGFPE */ - BlockSignals(true, SIGFPE); -#endif - - /* We are no longer interested in USR1 */ - BlockSignals(true, SIGUSR1); - -#if defined(SIGUSR2) - /* We are no longer interested in USR2 */ - BlockSignals(true, SIGUSR2); -#endif - - /* POSIX demands that signals are inherited. If the invoking process has - * these signals masked, we will have problems, as we won't recieve them. */ - BlockSignals(false, SIGHUP); - BlockSignals(false, SIGTERM); - - CatchSignal(SIGHUP, sig_hup); - CatchSignal(SIGTERM, sig_term); - -#ifndef HAVE_PRCTL - /* If prctl is not defined on the system, try to handle - * some common termination signals gracefully */ - CatchSignal(SIGSEGV, sig_segv_abrt); - CatchSignal(SIGABRT, sig_segv_abrt); -#endif - -} - -/* - handle io on stdin -*/ -static void server_stdin_handler(struct tevent_context *event_ctx, - struct tevent_fd *fde, - uint16_t flags, void *private) -{ - const char *binary_name = (const char *)private; - uint8_t c; - if (read(0, &c, 1) == 0) { - DEBUG(0,("%s: EOF on stdin - terminating\n", binary_name)); -#if HAVE_GETPGRP - if (getpgrp() == getpid()) { - kill(-getpgrp(), SIGTERM); - } -#endif - exit(0); - } -} - -/* - main server helpers. -*/ - -int die_if_parent_died(void) -{ -#ifdef HAVE_PRCTL - int ret; - - errno = 0; - ret = prctl(PR_SET_PDEATHSIG, SIGTERM, 0, 0, 0); - if (ret != 0) { - ret = errno; - DEBUG(2, ("prctl failed [%d]: %s", ret, strerror(ret))); - return ret; - } -#endif - return EOK; -} - -int server_setup(const char *name, int flags, - const char *conf_entry, - struct main_context **main_ctx) -{ - struct tevent_context *event_ctx; - struct main_context *ctx; - uint16_t stdin_event_flags; - char *conf_db; - int ret = EOK; - bool dt; - bool dl; - - debug_prg_name = strdup(name); - if (!debug_prg_name) { - return ENOMEM; - } - - setenv("_SSS_LOOPS", "NO", 0); - - setup_signals(); - - /* we want default permissions on created files to be very strict, - so set our umask to 0177 */ - umask(0177); - - if (flags & FLAGS_DAEMON) { - DEBUG(3,("Becoming a daemon.\n")); - become_daemon(true); - } - - if (flags & FLAGS_PID_FILE) { - ret = pidfile(PID_PATH, name); - if (ret != EOK) { - DEBUG(0, ("Error creating pidfile! (%d [%s])\n", - ret, strerror(ret))); - return ret; - } - } - - /* Set up locale */ - setlocale (LC_ALL, ""); - bindtextdomain (PACKAGE, LOCALEDIR); - textdomain (PACKAGE); - - /* the event context is the top level structure. - * Everything else should hang off that */ - event_ctx = tevent_context_init(talloc_autofree_context()); - if (event_ctx == NULL) { - DEBUG(0,("The event context initialiaziton failed\n")); - return 1; - } - - ctx = talloc(event_ctx, struct main_context); - if (ctx == NULL) { - DEBUG(0,("Out of memory, aborting!\n")); - return ENOMEM; - } - - ctx->event_ctx = event_ctx; - - conf_db = talloc_asprintf(ctx, "%s/%s", DB_PATH, CONFDB_FILE); - if (conf_db == NULL) { - DEBUG(0,("Out of memory, aborting!\n")); - return ENOMEM; - } - - ret = confdb_init(ctx, &ctx->confdb_ctx, conf_db); - if (ret != EOK) { - DEBUG(0,("The confdb initialization failed\n")); - return ret; - } - - /* set debug level if any in conf_entry */ - ret = confdb_get_int(ctx->confdb_ctx, ctx, conf_entry, - CONFDB_SERVICE_DEBUG_LEVEL, - debug_level, &debug_level); - if (ret != EOK) { - DEBUG(0, ("Error reading from confdb (%d) [%s]\n", - ret, strerror(ret))); - return ret; - } - - /* same for debug timestamps */ - dt = (debug_timestamps != 0); - ret = confdb_get_bool(ctx->confdb_ctx, ctx, conf_entry, - CONFDB_SERVICE_DEBUG_TIMESTAMPS, - dt, &dt); - if (ret != EOK) { - DEBUG(0, ("Error reading from confdb (%d) [%s]\n", - ret, strerror(ret))); - return ret; - } - if (dt) debug_timestamps = 1; - - /* same for debug to file */ - dl = (debug_to_file != 0); - ret = confdb_get_bool(ctx->confdb_ctx, ctx, conf_entry, - CONFDB_SERVICE_DEBUG_TO_FILES, - dl, &dl); - if (ret != EOK) { - DEBUG(0, ("Error reading from confdb (%d) [%s]\n", - ret, strerror(ret))); - return ret; - } - if (dl) debug_to_file = 1; - - /* open log file if told so */ - if (debug_to_file) { - ret = open_debug_file(); - if (ret != EOK) { - DEBUG(0, ("Error setting up logging (%d) [%s]\n", - ret, strerror(ret))); - return ret; - } - } - - DEBUG(3, ("CONFDB: %s\n", conf_db)); - - if (flags & FLAGS_INTERACTIVE) { - /* terminate when stdin goes away */ - stdin_event_flags = TEVENT_FD_READ; - } else { - /* stay alive forever */ - stdin_event_flags = 0; - } - - /* catch EOF on stdin */ -#ifdef SIGTTIN - signal(SIGTTIN, SIG_IGN); -#endif - tevent_add_fd(event_ctx, event_ctx, 0, stdin_event_flags, - server_stdin_handler, discard_const(name)); - - *main_ctx = ctx; - return EOK; -} - -void server_loop(struct main_context *main_ctx) -{ - /* wait for events - this is where the server sits for most of its - life */ - tevent_loop_wait(main_ctx->event_ctx); - - /* as everything hangs off this event context, freeing it - should initiate a clean shutdown of all services */ - talloc_free(main_ctx->event_ctx); -} |