busybox/debianutils/start_stop_daemon.c

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/* 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 int quiet;
static char *userspec;
static char *chuid;
static char *cmdname;
static char *execname;
static char *pidfile;
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);
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/* 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)
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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 }
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};
#endif
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enum {
CTX_STOP = 0x1,
CTX_START = 0x2,
OPT_BACKGROUND = 0x4,
OPT_QUIET = 0x8,
OPT_MAKEPID = 0x10,
OPT_OKNODO = 0x20 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY,
OPT_VERBOSE = 0x40 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY,
OPT_NICELEVEL = 0x80 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY,
};
int start_stop_daemon_main(int argc, char **argv)
{
unsigned opt;
char *signame = NULL;
char *startas = NULL;
#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
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/* 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, "KSbqm"
// USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:")
USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:")
"a:n:s:u:c:x:p:"
USE_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
// USE_FEATURE_START_STOP_DAEMON_FANCY(,&retry_arg)
,&startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile);
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quiet = (opt & OPT_QUIET) && !(opt & OPT_VERBOSE);
if (signame) {
signal_nr = get_signum(signame);
if (signal_nr < 0) bb_show_usage();
}
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if (!startas)
startas = execname;
// USE_FEATURE_START_STOP_DAEMON_FANCY(
// if (retry_arg)
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// 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) {
setsid();
bb_daemonize();
}
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 (chuid) {
user_id = bb_strtou(chuid, NULL, 10);
if (errno)
user_id = xuname2uid(chuid);
xsetuid(user_id);
}
#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);
}