From d4b9a588bade582ba2968f270101032a11981e17 Mon Sep 17 00:00:00 2001 From: Simo Sorce Date: Tue, 25 Nov 2008 16:42:38 -0500 Subject: Move all server helpers in util/server.c --- server/util/server.c | 400 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 400 insertions(+) create mode 100644 server/util/server.c (limited to 'server/util/server.c') diff --git a/server/util/server.c b/server/util/server.c new file mode 100644 index 000000000..45a6948ef --- /dev/null +++ b/server/util/server.c @@ -0,0 +1,400 @@ +/* + 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 + 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 . +*/ + +#include +#include +#include +#include +#include +#include +#include "../events/events.h" +#include "../ldb/include/ldb.h" +#include "confdb/confdb.h" +#include "util/util.h" + +/******************************************************************* + Close the low 3 fd's and open dev/null in their place. +********************************************************************/ +static void close_low_fds(bool stderr_too) +{ +#ifndef VALGRIND + int fd; + int i; + + close(0); + close(1); + + if (stderr_too) + 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++) { + if (i == 2 && !stderr_too) + continue; + + 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) +{ + if (Fork) { + if (fork()) { + _exit(0); + } + } + + /* detach from the terminal */ +#ifdef HAVE_SETSID + setsid(); +#elif defined(TIOCNOTTY) + { + int i = open("/dev/tty", O_RDWR, 0); + if (i != -1) { + ioctl(i, (int) TIOCNOTTY, (char *)0); + close(i); + } + } +#endif /* HAVE_SETSID */ + + /* Close fd's 0,1,2. Needed if started by rsh */ + close_low_fds(false); /* Don't close stderr, let the debug system + attach it to the logfile */ +} + +int pidfile(const char *path, const char *name) +{ + char pid_str[32]; + pid_t pid; + char *file; + int fd; + int ret; + + asprintf(&file, "%s/%s.pid", path, name); + + fd = open(file, O_RDONLY, 0644); + 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); + if (ret != 0 && errno != ESRCH) { + close(fd); + free(file); + return EEXIST; + } + } + } + + /* notihng in the file or no process */ + close(fd); + unlink(file); + + } else { + if (errno != ENOENT) { + free(file); + return EIO; + } + } + + fd = open(file, O_CREAT | O_WRONLY | O_EXCL, 0644); + if (fd == -1) { + free(file); + return EIO; + } + 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)); + if (ret != strlen(pid_str)) { + close(fd); + return EIO; + } + + 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); +} + +/* + 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); +} + +/* + handle io on stdin +*/ +static void server_stdin_handler(struct event_context *event_ctx, struct fd_event *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. +*/ +int main(int argc, const char *argv[]) +{ + char *service = NULL; + bool opt_daemon = false; + bool opt_interactive = false; + int opt; + poptContext pc; + struct event_context *event_ctx; + struct confdb_ctx *confdb_ctx; + TALLOC_CTX *mem_ctx; + uint16_t stdin_event_flags; + int ret = EOK; + bool is_monitor = false; + + debug_prg_name = argv[0]; + + enum { + OPT_DAEMON = 1000, + OPT_INTERACTIVE + }; + struct poptOption long_options[] = { + POPT_AUTOHELP + {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, + "Become a daemon (default)", NULL }, + {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, + "Run interactive (not a daemon)", NULL}, + {"service", 's', POPT_ARG_STRING, &service, 0, + "Executes a specific service instead of the monitor", NULL}, + {"debug-level", 'd', POPT_ARG_INT, &debug_level, 0, + "Executes a specific service instead of the monitor", NULL}, + { NULL } + }; + + pc = poptGetContext(argv[0], argc, argv, long_options, 0); + while((opt = poptGetNextOpt(pc)) != -1) { + switch(opt) { + case OPT_DAEMON: + opt_daemon = true; + break; + case OPT_INTERACTIVE: + opt_interactive = true; + break; + default: + fprintf(stderr, "\nInvalid option %s: %s\n\n", + poptBadOption(pc, 0), poptStrerror(opt)); + poptPrintUsage(pc, stderr, 0); + return 1; + } + } + + if (!service) { + fprintf(stderr,"\nERROR: No service specified\n\n"); + return 5; + } + + if (strcmp(service, "monitor") == 0) is_monitor = true; + + if (is_monitor) { + if (opt_daemon && opt_interactive) { + fprintf(stderr,"\nERROR: " + "Option -i|--interactive is not allowed together with -D|--daemon\n\n"); + poptPrintUsage(pc, stderr, 0); + return 1; + } else if (!opt_interactive) { + /* default is --daemon */ + opt_daemon = true; + } + } else { + if (opt_daemon || opt_interactive) { + fprintf(stderr,"\nERROR: " + "Options -i or -D not allowed with -s (service)\n\n"); + poptPrintUsage(pc, stderr, 0); + return 1; + } + + } + + poptFreeContext(pc); + + setup_signals(); + + /* we want default permissions on created files to be very strict, + so set our umask to 0177 */ + umask(0177); + + if (opt_daemon) { + DEBUG(3,("Becoming a daemon.\n")); + become_daemon(true); + + ret = pidfile(PID_PATH, "sssd"); + if (ret != EOK) { + fprintf(stderr, "\nERROR: PID File reports daemon already running!\n"); + return 1; + } + } + + /* the event context is the top level structure. + * Everything else should hang off that */ + event_ctx = event_context_init(talloc_autofree_context()); + if (event_ctx == NULL) { + DEBUG(0,("The event context initialiaziton failed\n")); + return 1; + } + + mem_ctx = talloc_new(event_ctx); + if (mem_ctx == NULL) { + DEBUG(0,("Out of memory, aborting!\n")); + return 1; + } + + ret = confdb_init(mem_ctx, event_ctx, &confdb_ctx); + if (ret != EOK) { + DEBUG(0,("The confdb initialization failed\n")); + return 1; + } + + if (opt_interactive) { + /* terminate when stdin goes away */ + stdin_event_flags = EVENT_FD_READ; + } else { + /* stay alive forever */ + stdin_event_flags = 0; + } + + /* catch EOF on stdin */ +#ifdef SIGTTIN + signal(SIGTTIN, SIG_IGN); +#endif + event_add_fd(event_ctx, event_ctx, 0, stdin_event_flags, + server_stdin_handler, + discard_const(argv[0])); + + /* What are we asked to run ? */ + if (is_monitor) { + /* the monitor */ + ret = monitor_process_init(mem_ctx, event_ctx, confdb_ctx); + + } else { + + if (strcmp(service, "nss") == 0) { + ret = nss_process_init(mem_ctx, event_ctx, confdb_ctx); + + } else if (strcmp(service, "dp") == 0) { + ret = dp_process_init(mem_ctx, event_ctx, confdb_ctx); + + } else { + fprintf(stderr, + "\nERROR: Unknown Service specified [%s]\n", + service); + ret = EINVAL; + } + } + + if (ret != EOK) return 3; + + /* wait for events - this is where smbd sits for most of its + life */ + event_loop_wait(event_ctx); + + /* as everything hangs off this event context, freeing it + should initiate a clean shutdown of all services */ + talloc_free(event_ctx); + + return 0; +} -- cgit