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- /* vi: set sw=4 ts=4: */
- /*
- * Mini start-stop-daemon implementation(s) for busybox
- *
- * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
- * Adapted for busybox David Kimdon <dwhedon@gordian.com>
- *
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
- */
- /*
- This is how it is supposed to work:
- start-stop-daemon [OPTIONS] [--start|--stop] [[--] arguments...]
- One (only) of these must be given:
- -S,--start Start
- -K,--stop Stop
- Search for matching processes.
- If --stop is given, stop all matching processes (by sending a signal).
- If --start is given, start a new process unless a matching process was found.
- Options controlling process matching
- (if multiple conditions are specified, all must match):
- -u,--user USERNAME|UID Only consider this user's processes
- -n,--name PROCESS_NAME Look for processes by matching PROCESS_NAME
- with comm field in /proc/$PID/stat.
- Only basename is compared:
- "ntpd" == "./ntpd" == "/path/to/ntpd".
- [TODO: can PROCESS_NAME be a full pathname? Should we require full match then
- with /proc/$PID/exe or argv[0] (comm can't be matched, it never contains path)]
- -x,--exec EXECUTABLE Look for processes that were started with this
- command in /proc/$PID/cmdline.
- Unlike -n, we match against the full path:
- "ntpd" != "./ntpd" != "/path/to/ntpd"
- -p,--pidfile PID_FILE Look for processes with PID from this file
- Options which are valid for --start only:
- -x,--exec EXECUTABLE Program to run (1st arg of execvp). Mandatory.
- -a,--startas NAME argv[0] (defaults to EXECUTABLE)
- -b,--background Put process into background
- -N,--nicelevel N Add N to process' nice level
- -c,--chuid USER[:[GRP]] Change to specified user [and group]
- -m,--make-pidfile Write PID to the pidfile
- (both -m and -p must be given!)
- Options which are valid for --stop only:
- -s,--signal SIG Signal to send (default:TERM)
- -t,--test Exit with status 0 if process is found
- (we don't actually start or stop daemons)
- Misc options:
- -o,--oknodo Exit with status 0 if nothing is done
- -q,--quiet Quiet
- -v,--verbose Verbose
- */
- #include <sys/resource.h>
- /* Override ENABLE_FEATURE_PIDFILE */
- #define WANT_PIDFILE 1
- #include "libbb.h"
- struct pid_list {
- struct pid_list *next;
- pid_t pid;
- };
- enum {
- CTX_STOP = (1 << 0),
- CTX_START = (1 << 1),
- OPT_BACKGROUND = (1 << 2), // -b
- OPT_QUIET = (1 << 3), // -q
- OPT_TEST = (1 << 4), // -t
- OPT_MAKEPID = (1 << 5), // -m
- OPT_a = (1 << 6), // -a
- OPT_n = (1 << 7), // -n
- OPT_s = (1 << 8), // -s
- OPT_u = (1 << 9), // -u
- OPT_c = (1 << 10), // -c
- OPT_x = (1 << 11), // -x
- OPT_p = (1 << 12), // -p
- OPT_OKNODO = (1 << 13) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -o
- OPT_VERBOSE = (1 << 14) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -v
- OPT_NICELEVEL = (1 << 15) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N
- };
- #define QUIET (option_mask32 & OPT_QUIET)
- #define TEST (option_mask32 & OPT_TEST)
- struct globals {
- struct pid_list *found;
- char *userspec;
- char *cmdname;
- char *execname;
- char *pidfile;
- int user_id;
- smallint signal_nr;
- };
- #define G (*(struct globals*)&bb_common_bufsiz1)
- #define found (G.found )
- #define userspec (G.userspec )
- #define cmdname (G.cmdname )
- #define execname (G.execname )
- #define pidfile (G.pidfile )
- #define user_id (G.user_id )
- #define signal_nr (G.signal_nr )
- #define INIT_G() do { \
- user_id = -1; \
- signal_nr = 15; \
- } while (0)
- #ifdef OLDER_VERSION_OF_X
- /* -x,--exec EXECUTABLE
- * Look for processes with matching /proc/$PID/exe.
- * Match is performed using device+inode.
- */
- static int pid_is_exec(pid_t pid)
- {
- struct stat st;
- char buf[sizeof("/proc//exe") + sizeof(int)*3];
- sprintf(buf, "/proc/%u/exe", (unsigned)pid);
- if (stat(buf, &st) < 0)
- return 0;
- if (st.st_dev == execstat.st_dev
- && st.st_ino == execstat.st_ino)
- return 1;
- return 0;
- }
- #endif
- static int pid_is_exec(pid_t pid)
- {
- ssize_t bytes;
- char buf[PATH_MAX];
- sprintf(buf, "/proc/%u/cmdline", (unsigned)pid);
- bytes = open_read_close(buf, buf, sizeof(buf) - 1);
- if (bytes > 0) {
- buf[bytes] = '\0';
- return strcmp(buf, execname) == 0;
- }
- return 0;
- }
- static int pid_is_name(pid_t pid)
- {
- /* /proc/PID/stat is "PID (comm_15_bytes_max) ..." */
- char buf[32]; /* should be enough */
- char *p, *pe;
- sprintf(buf, "/proc/%u/stat", (unsigned)pid);
- if (open_read_close(buf, buf, sizeof(buf) - 1) < 0)
- return 0;
- buf[sizeof(buf) - 1] = '\0'; /* paranoia */
- p = strchr(buf, '(');
- if (!p)
- return 0;
- pe = strrchr(++p, ')');
- if (!pe)
- return 0;
- *pe = '\0';
- /* we require comm to match and to not be truncated */
- /* in Linux, if comm is 15 chars, it may be a truncated
- * name, so we don't allow that to match */
- if (strlen(p) >= COMM_LEN - 1) /* COMM_LEN is 16 */
- return 0;
- return strcmp(p, cmdname) == 0;
- }
- static int pid_is_user(int pid)
- {
- struct stat sb;
- char buf[sizeof("/proc/") + sizeof(int)*3];
- sprintf(buf, "/proc/%u", (unsigned)pid);
- if (stat(buf, &sb) != 0)
- return 0;
- return (sb.st_uid == (uid_t)user_id);
- }
- static void check(int pid)
- {
- struct pid_list *p;
- if (execname && !pid_is_exec(pid)) {
- return;
- }
- if (cmdname && !pid_is_name(pid)) {
- return;
- }
- if (userspec && !pid_is_user(pid)) {
- return;
- }
- p = xmalloc(sizeof(*p));
- p->next = found;
- p->pid = pid;
- found = p;
- }
- static void do_pidfile(void)
- {
- FILE *f;
- unsigned pid;
- f = fopen_for_read(pidfile);
- if (f) {
- if (fscanf(f, "%u", &pid) == 1)
- check(pid);
- fclose(f);
- } else if (errno != ENOENT)
- bb_perror_msg_and_die("open pidfile %s", pidfile);
- }
- static void do_procinit(void)
- {
- DIR *procdir;
- struct dirent *entry;
- int pid;
- if (pidfile) {
- do_pidfile();
- return;
- }
- procdir = xopendir("/proc");
- pid = 0;
- while (1) {
- errno = 0; /* clear any previous error */
- entry = readdir(procdir);
- // TODO: this check is too generic, it's better
- // to check for exact errno(s) which mean that we got stale entry
- if (errno) /* Stale entry, process has died after opendir */
- continue;
- if (!entry) /* EOF, no more entries */
- break;
- pid = bb_strtou(entry->d_name, NULL, 10);
- if (errno) /* NaN */
- continue;
- check(pid);
- }
- closedir(procdir);
- if (!pid)
- bb_error_msg_and_die("nothing in /proc - not mounted?");
- }
- static int do_stop(void)
- {
- char *what;
- struct pid_list *p;
- int killed = 0;
- if (cmdname) {
- if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(cmdname);
- if (!ENABLE_FEATURE_CLEAN_UP) what = cmdname;
- } else if (execname) {
- if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(execname);
- if (!ENABLE_FEATURE_CLEAN_UP) what = execname;
- } else if (pidfile) {
- what = xasprintf("process in pidfile '%s'", pidfile);
- } else if (userspec) {
- what = xasprintf("process(es) owned by '%s'", userspec);
- } else {
- bb_error_msg_and_die("internal error, please report");
- }
- if (!found) {
- if (!QUIET)
- printf("no %s found; none killed\n", what);
- killed = -1;
- goto ret;
- }
- for (p = found; p; p = p->next) {
- if (TEST || kill(p->pid, signal_nr) == 0) {
- killed++;
- } else {
- p->pid = 0;
- bb_perror_msg("warning: killing process %u", (unsigned)p->pid);
- }
- }
- if (!QUIET && killed) {
- printf("stopped %s (pid", what);
- for (p = found; p; p = p->next)
- if (p->pid)
- printf(" %u", (unsigned)p->pid);
- puts(")");
- }
- ret:
- if (ENABLE_FEATURE_CLEAN_UP)
- free(what);
- return killed;
- }
- #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
- static const char start_stop_daemon_longopts[] ALIGN1 =
- "stop\0" No_argument "K"
- "start\0" No_argument "S"
- "background\0" No_argument "b"
- "quiet\0" No_argument "q"
- "test\0" No_argument "t"
- "make-pidfile\0" No_argument "m"
- #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
- "oknodo\0" No_argument "o"
- "verbose\0" No_argument "v"
- "nicelevel\0" Required_argument "N"
- #endif
- "startas\0" Required_argument "a"
- "name\0" Required_argument "n"
- "signal\0" Required_argument "s"
- "user\0" Required_argument "u"
- "chuid\0" Required_argument "c"
- "exec\0" Required_argument "x"
- "pidfile\0" Required_argument "p"
- #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
- "retry\0" Required_argument "R"
- #endif
- ;
- #endif
- int start_stop_daemon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
- int start_stop_daemon_main(int argc UNUSED_PARAM, char **argv)
- {
- unsigned opt;
- char *signame;
- char *startas;
- char *chuid;
- #ifdef OLDER_VERSION_OF_X
- struct stat execstat;
- #endif
- #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
- // char *retry_arg = NULL;
- // int retries = -1;
- char *opt_N;
- #endif
- INIT_G();
- #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
- applet_long_options = start_stop_daemon_longopts;
- #endif
- /* -K or -S is required; they are mutually exclusive */
- /* -p is required if -m is given */
- /* -xpun (at least one) is required if -K is given */
- /* -xa (at least one) is required if -S is given */
- /* -q turns off -v */
- opt_complementary = "K:S:K--S:S--K:m?p:K?xpun:S?xa"
- IF_FEATURE_START_STOP_DAEMON_FANCY("q-v");
- opt = getopt32(argv, "KSbqtma:n:s:u:c:x:p:"
- IF_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"),
- &startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile
- IF_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
- /* We accept and ignore -R <param> / --retry <param> */
- IF_FEATURE_START_STOP_DAEMON_FANCY(,NULL)
- );
- if (opt & OPT_s) {
- signal_nr = get_signum(signame);
- if (signal_nr < 0) bb_show_usage();
- }
- if (!(opt & OPT_a))
- startas = execname;
- if (!execname) /* in case -a is given and -x is not */
- execname = startas;
- // IF_FEATURE_START_STOP_DAEMON_FANCY(
- // if (retry_arg)
- // retries = xatoi_u(retry_arg);
- // )
- //argc -= optind;
- argv += optind;
- if (userspec) {
- user_id = bb_strtou(userspec, NULL, 10);
- if (errno)
- user_id = xuname2uid(userspec);
- }
- /* Both start and stop need to know current processes */
- do_procinit();
- if (opt & CTX_STOP) {
- int i = do_stop();
- return (opt & OPT_OKNODO) ? 0 : (i <= 0);
- }
- if (found) {
- if (!QUIET)
- printf("%s is already running\n%u\n", execname, (unsigned)found->pid);
- return !(opt & OPT_OKNODO);
- }
- #ifdef OLDER_VERSION_OF_X
- if (execname)
- xstat(execname, &execstat);
- #endif
- *--argv = startas;
- if (opt & OPT_BACKGROUND) {
- #if BB_MMU
- bb_daemonize(DAEMON_DEVNULL_STDIO + DAEMON_CLOSE_EXTRA_FDS);
- /* DAEMON_DEVNULL_STDIO is superfluous -
- * it's always done by bb_daemonize() */
- #else
- pid_t pid = vfork();
- if (pid < 0) /* error */
- bb_perror_msg_and_die("vfork");
- if (pid != 0) {
- /* parent */
- /* why _exit? the child may have changed the stack,
- * so "return 0" may do bad things */
- _exit(EXIT_SUCCESS);
- }
- /* Child */
- setsid(); /* detach from controlling tty */
- /* Redirect stdio to /dev/null, close extra FDs.
- * We do not actually daemonize because of DAEMON_ONLY_SANITIZE */
- bb_daemonize_or_rexec(DAEMON_DEVNULL_STDIO
- + DAEMON_CLOSE_EXTRA_FDS
- + DAEMON_ONLY_SANITIZE,
- NULL /* argv, unused */ );
- #endif
- }
- if (opt & OPT_MAKEPID) {
- /* User wants _us_ to make the pidfile */
- write_pidfile(pidfile);
- }
- if (opt & OPT_c) {
- struct bb_uidgid_t ugid = { -1, -1 };
- parse_chown_usergroup_or_die(&ugid, chuid);
- if (ugid.gid != (gid_t) -1) xsetgid(ugid.gid);
- if (ugid.uid != (uid_t) -1) xsetuid(ugid.uid);
- }
- #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
- if (opt & OPT_NICELEVEL) {
- /* Set process priority */
- int prio = getpriority(PRIO_PROCESS, 0) + xatoi_range(opt_N, INT_MIN/2, INT_MAX/2);
- if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
- bb_perror_msg_and_die("setpriority(%d)", prio);
- }
- }
- #endif
- execvp(startas, argv);
- bb_perror_msg_and_die("cannot start %s", startas);
- }
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