* Mini start-stop-daemon implementation(s) for busybox
*
* Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
- * public domain.
* Adapted for busybox David Kimdon <dwhedon@gordian.com>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdarg.h>
-#include <signal.h>
-#include <errno.h>
-#include <sys/stat.h>
-#include <dirent.h>
-#include <unistd.h>
-#include <getopt.h> /* struct option */
-
-#include "busybox.h"
-#include "pwd_.h"
-
-static int signal_nr = 15;
-static int user_id = -1;
-static int quiet = 0;
-static char *userspec = NULL;
-static char *cmdname = NULL;
-static char *execname = NULL;
-static char *pidfile = NULL;
+/*
+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;
};
-static struct pid_list *found = NULL;
-
-static inline void
-push(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 pid_list *p;
+ struct stat st;
+ char buf[sizeof("/proc//exe") + sizeof(int)*3];
- p = xmalloc(sizeof(*p));
- p->next = found;
- p->pid = pid;
- found = p;
+ 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, const char *name)
+static int pid_is_exec(pid_t pid)
{
- char buf[32];
- struct stat sb, exec_stat;
+ 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;
+}
- if (name)
- xstat(name, &exec_stat);
+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/%d/exe", pid);
- if (stat(buf, &sb) != 0)
+ 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;
- return (sb.st_dev == exec_stat.st_dev && sb.st_ino == exec_stat.st_ino);
+ 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, int uid)
+static int pid_is_user(int pid)
{
struct stat sb;
- char buf[32];
+ char buf[sizeof("/proc/") + sizeof(int)*3];
- sprintf(buf, "/proc/%d", pid);
+ sprintf(buf, "/proc/%u", (unsigned)pid);
if (stat(buf, &sb) != 0)
return 0;
- return (sb.st_uid == uid);
+ return (sb.st_uid == (uid_t)user_id);
}
-static int
-pid_is_cmd(pid_t pid, const char *name)
+static void check(int pid)
{
- char buf[32];
- FILE *f;
- int c;
-
- sprintf(buf, "/proc/%d/stat", pid);
- f = fopen(buf, "r");
- if (!f)
- return 0;
- while ((c = getc(f)) != EOF && c != '(')
- ;
- if (c != '(') {
- fclose(f);
- return 0;
- }
- /* this hopefully handles command names containing ')' */
- while ((c = getc(f)) != EOF && c == *name)
- name++;
- fclose(f);
- return (c == ')' && *name == '\0');
-}
-
+ struct pid_list *p;
-static void
-check(int pid)
-{
- if (execname && !pid_is_exec(pid, execname)) {
+ if (execname && !pid_is_exec(pid)) {
return;
}
- if (userspec && !pid_is_user(pid, user_id)) {
+ if (cmdname && !pid_is_name(pid)) {
return;
}
- if (cmdname && !pid_is_cmd(pid, cmdname)) {
+ if (userspec && !pid_is_user(pid)) {
return;
}
- push(pid);
+ p = xmalloc(sizeof(*p));
+ p->next = found;
+ p->pid = pid;
+ found = p;
}
-
-static void
-do_pidfile(void)
+static void do_pidfile(void)
{
FILE *f;
- pid_t pid;
+ unsigned pid;
f = fopen(pidfile, "r");
if (f) {
- if (fscanf(f, "%d", &pid) == 1)
+ 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)
+static void do_procinit(void)
{
DIR *procdir;
struct dirent *entry;
- int foundany, pid;
+ int pid;
if (pidfile) {
do_pidfile();
return;
}
- procdir = bb_xopendir("/proc");
+ procdir = xopendir("/proc");
- foundany = 0;
- while ((entry = readdir(procdir)) != NULL) {
- if (sscanf(entry->d_name, "%d", &pid) != 1)
+ 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;
- foundany++;
check(pid);
}
closedir(procdir);
- if (!foundany)
- bb_error_msg_and_die ("nothing in /proc - not mounted?");
+ if (!pid)
+ bb_error_msg_and_die("nothing in /proc - not mounted?");
}
-
-static void
-do_stop(void)
+static int do_stop(void)
{
- char what[1024];
+ char *what;
struct pid_list *p;
int killed = 0;
- do_procinit();
-
- if (cmdname)
- strcpy(what, cmdname);
- else if (execname)
- strcpy(what, execname);
- else if (pidfile)
- sprintf(what, "process in pidfile `%.200s'", pidfile);
- else if (userspec)
- sprintf(what, "process(es) owned by `%s'", userspec);
- else
- bb_error_msg_and_die ("internal error, please report");
+ 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);
- return;
+ if (!QUIET)
+ printf("no %s found; none killed\n", what);
+ killed = -1;
+ goto ret;
}
for (p = found; p; p = p->next) {
- if (kill(p->pid, signal_nr) == 0) {
- p->pid = -p->pid;
+ if (TEST || kill(p->pid, signal_nr) == 0) {
killed++;
} else {
- bb_perror_msg("warning: failed to kill %d", p->pid);
+ p->pid = 0;
+ bb_perror_msg("warning: killing process %u", (unsigned)p->pid);
}
}
- if (!quiet && killed) {
+ if (!QUIET && killed) {
printf("stopped %s (pid", what);
for (p = found; p; p = p->next)
- if(p->pid < 0)
- printf(" %d", -p->pid);
- printf(").\n");
+ if (p->pid)
+ printf(" %u", (unsigned)p->pid);
+ puts(")");
}
+ ret:
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(what);
+ return killed;
}
-
-static const struct option ssd_long_options[] = {
- { "stop", 0, NULL, 'K' },
- { "start", 0, NULL, 'S' },
- { "background", 0, NULL, 'b' },
- { "quiet", 0, NULL, 'q' },
- { "make-pidfile", 0, NULL, 'm' },
- { "startas", 1, NULL, 'a' },
- { "name", 1, NULL, 'n' },
- { "signal", 1, NULL, 's' },
- { "user", 1, NULL, 'u' },
- { "exec", 1, NULL, 'x' },
- { "pidfile", 1, NULL, 'p' },
- { 0, 0, 0, 0 }
-};
-
-#define SSD_CTX_STOP 1
-#define SSD_CTX_START 2
-#define SSD_OPT_BACKGROUND 4
-#define SSD_OPT_QUIET 8
-#define SSD_OPT_MAKEPID 16
-
-int
-start_stop_daemon_main(int argc, char **argv)
+#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 ATTRIBUTE_UNUSED, char **argv)
{
- unsigned long opt;
- char *signame = NULL;
- char *startas = NULL;
-
- bb_applet_long_options = ssd_long_options;
-
- /* Check required one context option was given */
- bb_opt_complementally = "K:S:?:K--S:S--K";
- opt = bb_getopt_ulflags(argc, argv, "KSbqma:n:s:u:x:p:",
- &startas, &cmdname, &signame, &userspec, &execname, &pidfile);
-
-
- quiet = opt & SSD_OPT_QUIET;
-
- if (signame) {
- signal_nr = bb_xgetlarg(signame, 10, 0, NSIG);
+ 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"
+ USE_FEATURE_START_STOP_DAEMON_FANCY("q-v");
+ opt = getopt32(argv, "KSbqtma:n:s:u:c:x:p:"
+ USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:"),
+// USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"),
+ &startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile
+ USE_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
+// USE_FEATURE_START_STOP_DAEMON_FANCY(,&retry_arg)
+ );
+
+ if (opt & OPT_s) {
+ signal_nr = get_signum(signame);
+ if (signal_nr < 0) bb_show_usage();
}
- if (!execname && !pidfile && !userspec && !cmdname)
- bb_error_msg_and_die ("need at least one of -x, -p, -u, or -n");
-
- if (!startas)
+ if (!(opt & OPT_a))
startas = execname;
-
- if ((opt & SSD_CTX_START) && !startas)
- bb_error_msg_and_die ("-S needs -x or -a");
-
- if ((opt & SSD_OPT_MAKEPID) && pidfile == NULL)
- bb_error_msg_and_die ("-m needs -p");
-
- argc -= optind;
+ if (!execname) /* in case -a is given and -x is not */
+ execname = startas;
+
+// USE_FEATURE_START_STOP_DAEMON_FANCY(
+// if (retry_arg)
+// retries = xatoi_u(retry_arg);
+// )
+ //argc -= optind;
argv += optind;
- if (userspec && sscanf(userspec, "%d", &user_id) != 1)
- user_id = bb_xgetpwnam(userspec);
-
- if (opt & SSD_CTX_STOP) {
- do_stop();
- return EXIT_SUCCESS;
+ 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 already running.\n%d\n", execname ,found->pid);
- return EXIT_SUCCESS;
+ 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 & SSD_OPT_BACKGROUND) {
- bb_xdaemon(0, 0);
- setsid();
+ 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 & SSD_OPT_MAKEPID) {
- /* user wants _us_ to make the pidfile */
- FILE *pidf = fopen(pidfile, "w");
- pid_t pidt = getpid();
- if (pidf == NULL)
- bb_perror_msg_and_die("Unable to write pidfile '%s'", pidfile);
- fprintf(pidf, "%d\n", pidt);
- fclose(pidf);
+ if (opt & OPT_c) {
+ struct bb_uidgid_t ugid;
+ 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);
+ }
}
- execv(startas, argv);
- bb_perror_msg_and_die ("unable to start %s", startas);
+#endif
+ execvp(startas, argv);
+ bb_perror_msg_and_die("cannot start %s", startas);
}
projects / oweals / busybox.git / blobdiff