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This change retains "or later" state! No licensing _changes_ here, only form is adjusted (article, space between "GPL" and "v2" and so on). Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
451 lines
12 KiB
C
451 lines
12 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini start-stop-daemon implementation(s) for busybox
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*
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* Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
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* Adapted for busybox David Kimdon <dwhedon@gordian.com>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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/*
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This is how it is supposed to work:
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start-stop-daemon [OPTIONS] [--start|--stop] [[--] arguments...]
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One (only) of these must be given:
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-S,--start Start
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-K,--stop Stop
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Search for matching processes.
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If --stop is given, stop all matching processes (by sending a signal).
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If --start is given, start a new process unless a matching process was found.
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Options controlling process matching
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(if multiple conditions are specified, all must match):
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-u,--user USERNAME|UID Only consider this user's processes
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-n,--name PROCESS_NAME Look for processes by matching PROCESS_NAME
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with comm field in /proc/$PID/stat.
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Only basename is compared:
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"ntpd" == "./ntpd" == "/path/to/ntpd".
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[TODO: can PROCESS_NAME be a full pathname? Should we require full match then
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with /proc/$PID/exe or argv[0] (comm can't be matched, it never contains path)]
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-x,--exec EXECUTABLE Look for processes that were started with this
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command in /proc/$PID/cmdline.
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Unlike -n, we match against the full path:
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"ntpd" != "./ntpd" != "/path/to/ntpd"
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-p,--pidfile PID_FILE Look for processes with PID from this file
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Options which are valid for --start only:
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-x,--exec EXECUTABLE Program to run (1st arg of execvp). Mandatory.
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-a,--startas NAME argv[0] (defaults to EXECUTABLE)
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-b,--background Put process into background
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-N,--nicelevel N Add N to process' nice level
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-c,--chuid USER[:[GRP]] Change to specified user [and group]
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-m,--make-pidfile Write PID to the pidfile
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(both -m and -p must be given!)
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Options which are valid for --stop only:
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-s,--signal SIG Signal to send (default:TERM)
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-t,--test Exit with status 0 if process is found
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(we don't actually start or stop daemons)
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Misc options:
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-o,--oknodo Exit with status 0 if nothing is done
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-q,--quiet Quiet
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-v,--verbose Verbose
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*/
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#include <sys/resource.h>
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/* Override ENABLE_FEATURE_PIDFILE */
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#define WANT_PIDFILE 1
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#include "libbb.h"
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struct pid_list {
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struct pid_list *next;
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pid_t pid;
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};
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enum {
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CTX_STOP = (1 << 0),
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CTX_START = (1 << 1),
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OPT_BACKGROUND = (1 << 2), // -b
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OPT_QUIET = (1 << 3), // -q
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OPT_TEST = (1 << 4), // -t
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OPT_MAKEPID = (1 << 5), // -m
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OPT_a = (1 << 6), // -a
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OPT_n = (1 << 7), // -n
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OPT_s = (1 << 8), // -s
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OPT_u = (1 << 9), // -u
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OPT_c = (1 << 10), // -c
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OPT_x = (1 << 11), // -x
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OPT_p = (1 << 12), // -p
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OPT_OKNODO = (1 << 13) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -o
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OPT_VERBOSE = (1 << 14) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -v
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OPT_NICELEVEL = (1 << 15) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N
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};
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#define QUIET (option_mask32 & OPT_QUIET)
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#define TEST (option_mask32 & OPT_TEST)
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struct globals {
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struct pid_list *found_procs;
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char *userspec;
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char *cmdname;
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char *execname;
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char *pidfile;
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char *execname_cmpbuf;
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unsigned execname_sizeof;
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int user_id;
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smallint signal_nr;
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define userspec (G.userspec )
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#define cmdname (G.cmdname )
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#define execname (G.execname )
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#define pidfile (G.pidfile )
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#define user_id (G.user_id )
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#define signal_nr (G.signal_nr )
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#define INIT_G() do { \
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user_id = -1; \
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signal_nr = 15; \
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} while (0)
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#ifdef OLDER_VERSION_OF_X
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/* -x,--exec EXECUTABLE
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* Look for processes with matching /proc/$PID/exe.
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* Match is performed using device+inode.
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*/
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static int pid_is_exec(pid_t pid)
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{
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struct stat st;
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char buf[sizeof("/proc/%u/exe") + sizeof(int)*3];
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sprintf(buf, "/proc/%u/exe", (unsigned)pid);
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if (stat(buf, &st) < 0)
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return 0;
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if (st.st_dev == execstat.st_dev
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&& st.st_ino == execstat.st_ino)
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return 1;
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return 0;
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}
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#endif
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static int pid_is_exec(pid_t pid)
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{
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ssize_t bytes;
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char buf[sizeof("/proc/%u/cmdline") + sizeof(int)*3];
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sprintf(buf, "/proc/%u/cmdline", (unsigned)pid);
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bytes = open_read_close(buf, G.execname_cmpbuf, G.execname_sizeof);
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if (bytes > 0) {
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G.execname_cmpbuf[bytes] = '\0';
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return strcmp(execname, G.execname_cmpbuf) == 0;
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}
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return 0;
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}
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static int pid_is_name(pid_t pid)
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{
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/* /proc/PID/stat is "PID (comm_15_bytes_max) ..." */
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char buf[32]; /* should be enough */
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char *p, *pe;
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sprintf(buf, "/proc/%u/stat", (unsigned)pid);
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if (open_read_close(buf, buf, sizeof(buf) - 1) < 0)
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return 0;
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buf[sizeof(buf) - 1] = '\0'; /* paranoia */
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p = strchr(buf, '(');
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if (!p)
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return 0;
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pe = strrchr(++p, ')');
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if (!pe)
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return 0;
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*pe = '\0';
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/* we require comm to match and to not be truncated */
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/* in Linux, if comm is 15 chars, it may be a truncated
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* name, so we don't allow that to match */
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if (strlen(p) >= COMM_LEN - 1) /* COMM_LEN is 16 */
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return 0;
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return strcmp(p, cmdname) == 0;
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}
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static int pid_is_user(int pid)
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{
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struct stat sb;
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char buf[sizeof("/proc/") + sizeof(int)*3];
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sprintf(buf, "/proc/%u", (unsigned)pid);
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if (stat(buf, &sb) != 0)
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return 0;
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return (sb.st_uid == (uid_t)user_id);
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}
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static void check(int pid)
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{
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struct pid_list *p;
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if (execname && !pid_is_exec(pid)) {
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return;
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}
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if (cmdname && !pid_is_name(pid)) {
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return;
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}
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if (userspec && !pid_is_user(pid)) {
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return;
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}
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p = xmalloc(sizeof(*p));
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p->next = G.found_procs;
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p->pid = pid;
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G.found_procs = p;
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}
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static void do_pidfile(void)
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{
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FILE *f;
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unsigned pid;
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f = fopen_for_read(pidfile);
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if (f) {
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if (fscanf(f, "%u", &pid) == 1)
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check(pid);
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fclose(f);
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} else if (errno != ENOENT)
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bb_perror_msg_and_die("open pidfile %s", pidfile);
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}
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static void do_procinit(void)
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{
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DIR *procdir;
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struct dirent *entry;
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int pid;
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if (pidfile) {
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do_pidfile();
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return;
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}
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procdir = xopendir("/proc");
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pid = 0;
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while (1) {
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errno = 0; /* clear any previous error */
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entry = readdir(procdir);
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// TODO: this check is too generic, it's better
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// to check for exact errno(s) which mean that we got stale entry
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if (errno) /* Stale entry, process has died after opendir */
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continue;
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if (!entry) /* EOF, no more entries */
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break;
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pid = bb_strtou(entry->d_name, NULL, 10);
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if (errno) /* NaN */
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continue;
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check(pid);
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}
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closedir(procdir);
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if (!pid)
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bb_error_msg_and_die("nothing in /proc - not mounted?");
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}
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static int do_stop(void)
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{
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char *what;
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struct pid_list *p;
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int killed = 0;
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if (cmdname) {
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if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(cmdname);
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if (!ENABLE_FEATURE_CLEAN_UP) what = cmdname;
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} else if (execname) {
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if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(execname);
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if (!ENABLE_FEATURE_CLEAN_UP) what = execname;
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} else if (pidfile) {
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what = xasprintf("process in pidfile '%s'", pidfile);
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} else if (userspec) {
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what = xasprintf("process(es) owned by '%s'", userspec);
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} else {
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bb_error_msg_and_die("internal error, please report");
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}
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if (!G.found_procs) {
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if (!QUIET)
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printf("no %s found; none killed\n", what);
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killed = -1;
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goto ret;
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}
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for (p = G.found_procs; p; p = p->next) {
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if (TEST || kill(p->pid, signal_nr) == 0) {
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killed++;
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} else {
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p->pid = 0;
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bb_perror_msg("warning: killing process %u", (unsigned)p->pid);
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}
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}
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if (!QUIET && killed) {
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printf("stopped %s (pid", what);
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for (p = G.found_procs; p; p = p->next)
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if (p->pid)
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printf(" %u", (unsigned)p->pid);
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puts(")");
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}
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ret:
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if (ENABLE_FEATURE_CLEAN_UP)
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free(what);
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return killed;
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}
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#if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
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static const char start_stop_daemon_longopts[] ALIGN1 =
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"stop\0" No_argument "K"
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"start\0" No_argument "S"
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"background\0" No_argument "b"
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"quiet\0" No_argument "q"
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"test\0" No_argument "t"
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"make-pidfile\0" No_argument "m"
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#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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"oknodo\0" No_argument "o"
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"verbose\0" No_argument "v"
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"nicelevel\0" Required_argument "N"
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#endif
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"startas\0" Required_argument "a"
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"name\0" Required_argument "n"
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"signal\0" Required_argument "s"
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"user\0" Required_argument "u"
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"chuid\0" Required_argument "c"
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"exec\0" Required_argument "x"
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"pidfile\0" Required_argument "p"
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#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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"retry\0" Required_argument "R"
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#endif
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;
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#endif
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int start_stop_daemon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int start_stop_daemon_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned opt;
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char *signame;
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char *startas;
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char *chuid;
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#ifdef OLDER_VERSION_OF_X
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struct stat execstat;
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#endif
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#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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// char *retry_arg = NULL;
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// int retries = -1;
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char *opt_N;
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#endif
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INIT_G();
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#if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
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applet_long_options = start_stop_daemon_longopts;
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#endif
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/* -K or -S is required; they are mutually exclusive */
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/* -p is required if -m is given */
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/* -xpun (at least one) is required if -K is given */
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/* -xa (at least one) is required if -S is given */
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/* -q turns off -v */
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opt_complementary = "K:S:K--S:S--K:m?p:K?xpun:S?xa"
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IF_FEATURE_START_STOP_DAEMON_FANCY("q-v");
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opt = getopt32(argv, "KSbqtma:n:s:u:c:x:p:"
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IF_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"),
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&startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile
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IF_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
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/* We accept and ignore -R <param> / --retry <param> */
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IF_FEATURE_START_STOP_DAEMON_FANCY(,NULL)
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);
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if (opt & OPT_s) {
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signal_nr = get_signum(signame);
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if (signal_nr < 0) bb_show_usage();
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}
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if (!(opt & OPT_a))
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startas = execname;
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if (!execname) /* in case -a is given and -x is not */
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execname = startas;
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if (execname) {
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G.execname_sizeof = strlen(execname) + 1;
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G.execname_cmpbuf = xmalloc(G.execname_sizeof + 1);
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}
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// IF_FEATURE_START_STOP_DAEMON_FANCY(
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// if (retry_arg)
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// retries = xatoi_positive(retry_arg);
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// )
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//argc -= optind;
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argv += optind;
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if (userspec) {
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user_id = bb_strtou(userspec, NULL, 10);
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if (errno)
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user_id = xuname2uid(userspec);
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}
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/* Both start and stop need to know current processes */
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do_procinit();
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if (opt & CTX_STOP) {
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int i = do_stop();
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return (opt & OPT_OKNODO) ? 0 : (i <= 0);
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}
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if (G.found_procs) {
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if (!QUIET)
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printf("%s is already running\n%u\n", execname, (unsigned)G.found_procs->pid);
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return !(opt & OPT_OKNODO);
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}
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#ifdef OLDER_VERSION_OF_X
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if (execname)
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xstat(execname, &execstat);
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#endif
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*--argv = startas;
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if (opt & OPT_BACKGROUND) {
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#if BB_MMU
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bb_daemonize(DAEMON_DEVNULL_STDIO + DAEMON_CLOSE_EXTRA_FDS);
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/* DAEMON_DEVNULL_STDIO is superfluous -
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* it's always done by bb_daemonize() */
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#else
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pid_t pid = xvfork();
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if (pid != 0) {
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/* parent */
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/* why _exit? the child may have changed the stack,
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* so "return 0" may do bad things */
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_exit(EXIT_SUCCESS);
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}
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/* Child */
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setsid(); /* detach from controlling tty */
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/* Redirect stdio to /dev/null, close extra FDs.
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* We do not actually daemonize because of DAEMON_ONLY_SANITIZE */
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bb_daemonize_or_rexec(DAEMON_DEVNULL_STDIO
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+ DAEMON_CLOSE_EXTRA_FDS
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+ DAEMON_ONLY_SANITIZE,
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NULL /* argv, unused */ );
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#endif
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}
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if (opt & OPT_MAKEPID) {
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/* User wants _us_ to make the pidfile */
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write_pidfile(pidfile);
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}
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if (opt & OPT_c) {
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struct bb_uidgid_t ugid = { -1, -1 };
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parse_chown_usergroup_or_die(&ugid, chuid);
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if (ugid.gid != (gid_t) -1) xsetgid(ugid.gid);
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if (ugid.uid != (uid_t) -1) xsetuid(ugid.uid);
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}
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#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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if (opt & OPT_NICELEVEL) {
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/* Set process priority */
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int prio = getpriority(PRIO_PROCESS, 0) + xatoi_range(opt_N, INT_MIN/2, INT_MAX/2);
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if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
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bb_perror_msg_and_die("setpriority(%d)", prio);
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}
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}
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#endif
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execvp(startas, argv);
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bb_perror_msg_and_die("can't execute '%s'", startas);
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}
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