mirror of
https://github.com/sheumann/hush.git
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279 lines
5.2 KiB
C
279 lines
5.2 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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* public domain.
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* Adapted for busybox David Kimdon <dwhedon@gordian.com>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <signal.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <getopt.h>
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#include "busybox.h"
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#include "pwd_.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 = 0;
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static char *userspec = NULL;
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static char *cmdname = NULL;
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static char *execname = NULL;
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static char *pidfile = NULL;
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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 = NULL;
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static inline void
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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
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pid_is_exec(pid_t pid, const char *name)
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{
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char buf[32];
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struct stat sb, exec_stat;
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if (name && stat(name, &exec_stat))
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bb_perror_msg_and_die("stat %s", name);
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sprintf(buf, "/proc/%d/exe", pid);
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if (stat(buf, &sb) != 0)
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return 0;
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return (sb.st_dev == exec_stat.st_dev && sb.st_ino == exec_stat.st_ino);
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}
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static int
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pid_is_user(int pid, int uid)
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{
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struct stat sb;
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char buf[32];
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sprintf(buf, "/proc/%d", 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
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pid_is_cmd(pid_t pid, const char *name)
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{
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char buf[32];
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FILE *f;
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int c;
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sprintf(buf, "/proc/%d/stat", pid);
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f = fopen(buf, "r");
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if (!f)
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return 0;
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while ((c = getc(f)) != EOF && c != '(')
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;
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if (c != '(') {
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fclose(f);
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return 0;
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}
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/* this hopefully handles command names containing ')' */
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while ((c = getc(f)) != EOF && c == *name)
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name++;
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fclose(f);
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return (c == ')' && *name == '\0');
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}
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static void
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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
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do_pidfile(const char *name)
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{
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FILE *f;
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pid_t pid;
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f = fopen(name, "r");
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if (f) {
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if (fscanf(f, "%d", &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", name);
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}
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static void
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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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procdir = opendir("/proc");
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if (!procdir)
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bb_perror_msg_and_die ("opendir /proc");
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foundany = 0;
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while ((entry = readdir(procdir)) != NULL) {
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if (sscanf(entry->d_name, "%d", &pid) != 1)
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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 void
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do_stop(void)
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{
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char what[1024];
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struct pid_list *p;
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int killed = 0;
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if (pidfile)
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do_pidfile(pidfile);
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else
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do_procinit();
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if (cmdname)
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strcpy(what, cmdname);
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else if (execname)
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strcpy(what, execname);
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else if (userspec)
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sprintf(what, "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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return;
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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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printf(").\n");
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}
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}
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static const struct option ssd_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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{ "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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{ "exec", 1, NULL, 'x' },
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{ "pidfile", 1, NULL, 'p' },
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{ 0, 0, 0, 0 }
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};
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#define SSD_CTX_STOP 1
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#define SSD_CTX_START 2
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#define SSD_OPT_BACKGROUND 4
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#define SSD_OPT_QUIET 8
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int
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start_stop_daemon_main(int argc, char **argv)
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{
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unsigned long opt;
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char *signame = NULL;
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char *startas = NULL;
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bb_applet_long_options = ssd_long_options;
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bb_opt_complementaly = "K~S:S~K";
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opt = bb_getopt_ulflags(argc, argv, "KSbqa:n:s:u:x:p:",
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&startas, &cmdname, &signame, &userspec, &execname, &pidfile);
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/* Check one and only one context option was given */
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if ((opt & 0x80000000UL) || (opt & (SSD_CTX_STOP | SSD_CTX_START)) == 0) {
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bb_show_usage();
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}
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if (signame) {
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signal_nr = bb_xgetlarg(signame, 10, 0, NSIG);
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}
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if (!execname && !userspec)
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bb_error_msg_and_die ("need at least one of -x or -u");
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if (!startas)
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startas = execname;
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if ((opt & SSD_CTX_START) && !startas)
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bb_error_msg_and_die ("-S needs -x or -a");
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argc -= optind;
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argv += optind;
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if (userspec && sscanf(userspec, "%d", &user_id) != 1)
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user_id = my_getpwnam(userspec);
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do_procinit();
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if (opt & SSD_CTX_STOP) {
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do_stop();
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return EXIT_SUCCESS;
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}
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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 EXIT_SUCCESS;
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}
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*--argv = startas;
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if (opt & SSD_OPT_BACKGROUND) {
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if (daemon(0, 0) == -1)
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bb_perror_msg_and_die ("unable to fork");
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}
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setsid();
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execv(startas, argv);
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bb_perror_msg_and_die ("unable to start %s", startas);
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}
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