323 lines
7.0 KiB
C
323 lines
7.0 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 tarball for details.
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*/
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#include "busybox.h"
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#include <getopt.h>
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#include <sys/resource.h>
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static int signal_nr = 15;
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static int user_id = -1;
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static int quiet;
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static char *userspec;
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static char *chuid;
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static char *cmdname;
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static char *execname;
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static char *pidfile;
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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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static struct pid_list *found;
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static inline void push(pid_t pid)
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{
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struct pid_list *p;
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p = xmalloc(sizeof(*p));
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p->next = found;
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p->pid = pid;
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found = p;
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}
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static int pid_is_exec(pid_t pid, const char *name)
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{
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char buf[sizeof("/proc//exe") + sizeof(int)*3];
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char *execbuf;
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int sz;
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int equal;
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sprintf(buf, "/proc/%d/exe", pid);
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sz = strlen(name) + 1;
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execbuf = xzalloc(sz);
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readlink(buf, execbuf, sz);
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/* if readlink fails, execbuf still contains "" */
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equal = !strcmp(execbuf, name);
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if (ENABLE_FEATURE_CLEAN_UP)
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free(execbuf);
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return equal;
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}
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static int pid_is_user(int pid, int uid)
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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", 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);
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}
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static int pid_is_cmd(pid_t pid, const char *name)
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{
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char fname[sizeof("/proc//stat") + sizeof(int)*3];
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char *buf;
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int r = 0;
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sprintf(fname, "/proc/%u/stat", pid);
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buf = xmalloc_open_read_close(fname, NULL);
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if (buf) {
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char *p = strchr(buf, '(');
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if (p) {
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char *pe = strrchr(++p, ')');
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if (pe) {
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*pe = '\0';
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r = !strcmp(p, name);
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}
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}
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free(buf);
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}
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return r;
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}
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static void check(int pid)
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{
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if (execname && !pid_is_exec(pid, execname)) {
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return;
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}
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if (userspec && !pid_is_user(pid, user_id)) {
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return;
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}
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if (cmdname && !pid_is_cmd(pid, cmdname)) {
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return;
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}
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push(pid);
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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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pid_t pid;
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f = fopen(pidfile, "r");
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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 foundany, 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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foundany = 0;
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while ((entry = readdir(procdir)) != NULL) {
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pid = bb_strtou(entry->d_name, NULL, 10);
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if (errno)
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continue;
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foundany++;
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check(pid);
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}
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closedir(procdir);
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if (!foundany)
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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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do_procinit();
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if (cmdname)
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what = xstrdup(cmdname);
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else if (execname)
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what = xstrdup(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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if (!found) {
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if (!quiet)
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printf("no %s found; none killed\n", what);
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if (ENABLE_FEATURE_CLEAN_UP)
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free(what);
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return -1;
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}
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for (p = found; p; p = p->next) {
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if (kill(p->pid, signal_nr) == 0) {
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p->pid = -p->pid;
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killed++;
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} else {
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bb_perror_msg("warning: failed to kill %d", 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 = found; p; p = p->next)
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if(p->pid < 0)
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printf(" %d", -p->pid);
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puts(")");
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}
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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 struct option long_options[] = {
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{ "stop", 0, NULL, 'K' },
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{ "start", 0, NULL, 'S' },
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{ "background", 0, NULL, 'b' },
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{ "quiet", 0, NULL, 'q' },
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{ "make-pidfile", 0, NULL, 'm' },
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#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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{ "oknodo", 0, NULL, 'o' },
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{ "verbose", 0, NULL, 'v' },
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{ "nicelevel", 1, NULL, 'N' },
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#endif
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{ "startas", 1, NULL, 'a' },
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{ "name", 1, NULL, 'n' },
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{ "signal", 1, NULL, 's' },
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{ "user", 1, NULL, 'u' },
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{ "chuid", 1, NULL, 'c' },
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{ "exec", 1, NULL, 'x' },
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{ "pidfile", 1, NULL, 'p' },
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#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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{ "retry", 1, NULL, 'R' },
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#endif
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{ 0, 0, 0, 0 }
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};
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#endif
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enum {
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CTX_STOP = 0x1,
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CTX_START = 0x2,
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OPT_BACKGROUND = 0x4,
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OPT_QUIET = 0x8,
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OPT_MAKEPID = 0x10,
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OPT_OKNODO = 0x20 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY,
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OPT_VERBOSE = 0x40 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY,
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OPT_NICELEVEL = 0x80 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY,
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};
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int start_stop_daemon_main(int argc, char **argv)
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{
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unsigned opt;
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char *signame = NULL;
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char *startas = NULL;
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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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#if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
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applet_long_options = long_options;
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#endif
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/* Check required one context option was given */
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opt_complementary = "K:S:?:K--S:S--K:m?p:K?xpun:S?xa";
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opt = getopt32(argc, argv, "KSbqm"
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// USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:")
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USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:")
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"a:n:s:u:c:x:p:"
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USE_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
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// USE_FEATURE_START_STOP_DAEMON_FANCY(,&retry_arg)
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,&startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile);
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quiet = (opt & OPT_QUIET) && !(opt & OPT_VERBOSE);
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if (signame) {
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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 (!startas)
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startas = execname;
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// USE_FEATURE_START_STOP_DAEMON_FANCY(
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// if (retry_arg)
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// retries = xatoi_u(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 = bb_xgetpwnam(userspec);
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}
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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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do_procinit();
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if (found) {
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if (!quiet)
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printf("%s already running\n%d\n", execname, found->pid);
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return !(opt & OPT_OKNODO);
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}
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*--argv = startas;
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if (opt & OPT_BACKGROUND) {
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xdaemon(0, 0);
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setsid();
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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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FILE *pidf = xfopen(pidfile, "w");
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pid_t pidt = getpid();
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fprintf(pidf, "%d\n", pidt);
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fclose(pidf);
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}
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if (chuid) {
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user_id = bb_strtou(chuid, NULL, 10);
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if (errno)
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user_id = bb_xgetpwnam(chuid);
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xsetuid(user_id);
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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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execv(startas, argv);
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bb_perror_msg_and_die("cannot start %s", startas);
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}
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