/* 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. */ #include "busybox.h" #include <getopt.h> #include <sys/resource.h> static int signal_nr = 15; static int user_id = -1; static char *userspec; static char *cmdname; static char *execname; static char *pidfile; static smallint quiet; struct pid_list { struct pid_list *next; pid_t pid; }; static struct pid_list *found; static inline void push(pid_t pid) { struct pid_list *p; p = xmalloc(sizeof(*p)); p->next = found; p->pid = pid; found = p; } static int pid_is_exec(pid_t pid, const char *name) { char buf[sizeof("/proc//exe") + sizeof(int)*3]; char *execbuf; int sz; int equal; sprintf(buf, "/proc/%d/exe", pid); sz = strlen(name) + 1; execbuf = xzalloc(sz); readlink(buf, execbuf, sz); /* if readlink fails, execbuf still contains "" */ equal = !strcmp(execbuf, name); if (ENABLE_FEATURE_CLEAN_UP) free(execbuf); return equal; } static int pid_is_user(int pid, int uid) { struct stat sb; char buf[sizeof("/proc/") + sizeof(int)*3]; sprintf(buf, "/proc/%u", pid); if (stat(buf, &sb) != 0) return 0; return (sb.st_uid == uid); } static int pid_is_cmd(pid_t pid, const char *name) { char fname[sizeof("/proc//stat") + sizeof(int)*3]; char *buf; int r = 0; sprintf(fname, "/proc/%u/stat", pid); buf = xmalloc_open_read_close(fname, NULL); if (buf) { char *p = strchr(buf, '('); if (p) { char *pe = strrchr(++p, ')'); if (pe) { *pe = '\0'; r = !strcmp(p, name); } } free(buf); } return r; } static void check(int pid) { if (execname && !pid_is_exec(pid, execname)) { return; } if (userspec && !pid_is_user(pid, user_id)) { return; } if (cmdname && !pid_is_cmd(pid, cmdname)) { return; } push(pid); } static void do_pidfile(void) { FILE *f; pid_t pid; f = fopen(pidfile, "r"); 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 foundany, pid; if (pidfile) { do_pidfile(); return; } procdir = xopendir("/proc"); foundany = 0; while ((entry = readdir(procdir)) != NULL) { pid = bb_strtou(entry->d_name, NULL, 10); if (errno) continue; foundany++; check(pid); } closedir(procdir); if (!foundany) bb_error_msg_and_die ("nothing in /proc - not mounted?"); } static int do_stop(void) { char *what; struct pid_list *p; int killed = 0; do_procinit(); if (cmdname) what = xstrdup(cmdname); else if (execname) what = xstrdup(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); if (ENABLE_FEATURE_CLEAN_UP) free(what); return -1; } for (p = found; p; p = p->next) { if (kill(p->pid, signal_nr) == 0) { p->pid = -p->pid; killed++; } else { bb_perror_msg("warning: failed to kill %d", p->pid); } } if (!quiet && killed) { printf("stopped %s (pid", what); for (p = found; p; p = p->next) if(p->pid < 0) printf(" %d", -p->pid); puts(")"); } if (ENABLE_FEATURE_CLEAN_UP) free(what); return killed; } #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS static const struct option long_options[] = { { "stop", 0, NULL, 'K' }, { "start", 0, NULL, 'S' }, { "background", 0, NULL, 'b' }, { "quiet", 0, NULL, 'q' }, { "make-pidfile", 0, NULL, 'm' }, #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY { "oknodo", 0, NULL, 'o' }, { "verbose", 0, NULL, 'v' }, { "nicelevel", 1, NULL, 'N' }, #endif { "startas", 1, NULL, 'a' }, { "name", 1, NULL, 'n' }, { "signal", 1, NULL, 's' }, { "user", 1, NULL, 'u' }, { "chuid", 1, NULL, 'c' }, { "exec", 1, NULL, 'x' }, { "pidfile", 1, NULL, 'p' }, #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY { "retry", 1, NULL, 'R' }, #endif { 0, 0, 0, 0 } }; #endif enum { CTX_STOP = 0x1, CTX_START = 0x2, OPT_BACKGROUND = 0x4, // -b OPT_QUIET = 0x8, // -q OPT_MAKEPID = 0x10, // -m OPT_a = 0x20, // -a OPT_n = 0x40, // -n OPT_s = 0x80, // -s OPT_u = 0x100, // -u OPT_c = 0x200, // -c OPT_x = 0x400, // -x OPT_p = 0x800, // -p OPT_OKNODO = 0x1000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -o OPT_VERBOSE = 0x2000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -v OPT_NICELEVEL = 0x4000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N }; int start_stop_daemon_main(int argc, char **argv); int start_stop_daemon_main(int argc, char **argv) { unsigned opt; char *signame; char *startas; char *chuid; #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY // char *retry_arg = NULL; // int retries = -1; char *opt_N; #endif #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS applet_long_options = long_options; #endif /* Check required one context option was given */ opt_complementary = "K:S:?:K--S:S--K:m?p:K?xpun:S?xa"; opt = getopt32(argc, argv, "KSbqma: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) ); quiet = (opt & OPT_QUIET) && !(opt & OPT_VERBOSE); if (opt & OPT_s) { signal_nr = get_signum(signame); if (signal_nr < 0) bb_show_usage(); } if (!(opt & OPT_a)) startas = execname; // USE_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); } if (opt & CTX_STOP) { int i = do_stop(); return (opt & OPT_OKNODO) ? 0 : (i<=0); } do_procinit(); if (found) { if (!quiet) printf("%s already running\n%d\n", execname, found->pid); return !(opt & OPT_OKNODO); } *--argv = startas; if (opt & OPT_BACKGROUND) { bb_daemonize(0); } if (opt & OPT_MAKEPID) { /* user wants _us_ to make the pidfile */ FILE *pidf = xfopen(pidfile, "w"); pid_t pidt = getpid(); 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); } } #endif execv(startas, argv); bb_perror_msg_and_die("cannot start %s", startas); }