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openrc/src/start-stop-daemon.c
Roy Marples 4022522a81 cbasename -> basename_c
2007-12-19 13:53:52 +00:00

1071 lines
25 KiB
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/*
start-stop-daemon
Starts, stops, tests and signals daemons
This is essentially a ground up re-write of Debians
start-stop-daemon for cleaner code and to integrate into our RC
system so we can monitor daemons a little.
*/
/*
* Copyright 2007 Roy Marples
* All rights reserved
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* nano seconds */
#define POLL_INTERVAL 20000000
#define WAIT_PIDFILE 500000000
#define START_WAIT 100000000
#define ONE_SECOND 1000000000
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/termios.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <grp.h>
#include <pwd.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#ifdef HAVE_PAM
#include <security/pam_appl.h>
/* We are not supporting authentication conversations */
static struct pam_conv conv = { NULL, NULL};
#endif
#include "builtins.h"
#include "einfo.h"
#include "rc.h"
#include "rc-misc.h"
#include "strlist.h"
typedef struct schedulelist
{
enum
{
schedule_timeout,
schedule_signal,
schedule_goto,
schedule_forever
} type;
int value;
struct schedulelist *gotolist;
struct schedulelist *next;
} schedulelist_t;
static schedulelist_t *schedule;
static const char *applet;
static char *changeuser;
static char **newenv;
extern char **environ;
static void free_schedulelist (schedulelist_t **list)
{
schedulelist_t *here;
schedulelist_t *next;
for (here = *list; here; here = next) {
next = here->next;
free (here);
}
*list = NULL;
}
static void cleanup (void)
{
if (changeuser)
free (changeuser);
if (schedule)
free_schedulelist (&schedule);
if (newenv)
rc_strlist_free (newenv);
}
static int parse_signal (const char *sig)
{
typedef struct signalpair
{
const char *name;
int signal;
} signalpair_t;
static const signalpair_t signallist[] = {
{ "ABRT", SIGABRT },
{ "ALRM", SIGALRM },
{ "FPE", SIGFPE },
{ "HUP", SIGHUP },
{ "ILL", SIGILL },
{ "INT", SIGINT },
{ "KILL", SIGKILL },
{ "PIPE", SIGPIPE },
{ "QUIT", SIGQUIT },
{ "SEGV", SIGSEGV },
{ "TERM", SIGTERM },
{ "USR1", SIGUSR1 },
{ "USR2", SIGUSR2 },
{ "CHLD", SIGCHLD },
{ "CONT", SIGCONT },
{ "STOP", SIGSTOP },
{ "TSTP", SIGTSTP },
{ "TTIN", SIGTTIN },
{ "TTOU", SIGTTOU }
};
unsigned int i = 0;
char *s;
if (! sig || strlen (sig) == 0)
return (-1);
if (sscanf (sig, "%u", &i) == 1) {
if (i > 0 && i < sizeof (signallist) / sizeof (signallist[0]))
return (i);
eerrorx ("%s: `%s' is not a valid signal", applet, sig);
}
if (strncmp (sig, "SIG", 3) == 0)
s = (char *) sig + 3;
else
s = NULL;
for (i = 0; i < sizeof (signallist) / sizeof (signallist[0]); i++)
if (strcmp (sig, signallist[i].name) == 0 ||
(s && strcmp (s, signallist[i].name) == 0))
return (signallist[i].signal);
eerrorx ("%s: `%s' is not a valid signal", applet, sig);
}
static void parse_schedule_item (schedulelist_t *item, const char *string)
{
const char *after_hyph;
int sig;
if (strcmp (string,"forever") == 0)
item->type = schedule_forever;
else if (isdigit (string[0])) {
item->type = schedule_timeout;
errno = 0;
if (sscanf (string, "%d", &item->value) != 1)
eerrorx ("%s: invalid timeout value in schedule `%s'", applet,
string);
} else if ((after_hyph = string + (string[0] == '-')) &&
((sig = parse_signal (after_hyph)) != -1))
{
item->type = schedule_signal;
item->value = (int) sig;
}
else
eerrorx ("%s: invalid schedule item `%s'", applet, string);
}
static void parse_schedule (const char *string, int default_signal)
{
char buffer[20];
const char *slash;
int count = 0;
schedulelist_t *repeatat = NULL;
ptrdiff_t len;
schedulelist_t *next;
if (string)
for (slash = string; *slash; slash++)
if (*slash == '/')
count++;
if (schedule)
free_schedulelist (&schedule);
schedule = xmalloc (sizeof (schedulelist_t));
schedule->gotolist = NULL;
if (count == 0) {
schedule->type = schedule_signal;
schedule->value = default_signal;
schedule->next = xmalloc (sizeof (schedulelist_t));
next = schedule->next;
next->type = schedule_timeout;
next->gotolist = NULL;
if (string) {
if (sscanf (string, "%d", &next->value) != 1)
eerrorx ("%s: invalid timeout value in schedule", applet);
}
else
next->value = 5;
next->next = NULL;
return;
}
next = schedule;
while (string != NULL) {
if ((slash = strchr (string, '/')))
len = slash - string;
else
len = strlen (string);
if (len >= (ptrdiff_t) sizeof (buffer))
eerrorx ("%s: invalid schedule item, far too long", applet);
memcpy (buffer, string, len);
buffer[len] = 0;
string = slash ? slash + 1 : NULL;
parse_schedule_item (next, buffer);
if (next->type == schedule_forever) {
if (repeatat)
eerrorx ("%s: invalid schedule, `forever' appears more than once",
applet);
repeatat = next;
continue;
}
if (string) {
next->next = xmalloc (sizeof (schedulelist_t));
next = next->next;
next->gotolist = NULL;
}
}
if (repeatat) {
next->next = xmalloc (sizeof (schedulelist_t));
next = next->next;
next->type = schedule_goto;
next->value = 0;
next->gotolist = repeatat;
}
next->next = NULL;
return;
}
static pid_t get_pid (const char *pidfile, bool quiet)
{
FILE *fp;
pid_t pid;
if (! pidfile)
return (-1);
if ((fp = fopen (pidfile, "r")) == NULL) {
if (! quiet)
eerror ("%s: fopen `%s': %s", applet, pidfile, strerror (errno));
return (-1);
}
if (fscanf (fp, "%d", &pid) != 1) {
if (! quiet)
eerror ("%s: no pid found in `%s'", applet, pidfile);
fclose (fp);
return (-1);
}
fclose (fp);
return (pid);
}
/* return number of processed killed, -1 on error */
static int do_stop (const char *exec, const char *cmd,
const char *pidfile, uid_t uid,int sig,
bool quiet, bool verbose, bool test)
{
pid_t *pids;
bool killed;
int nkilled = 0;
pid_t pid = 0;
int i;
if (pidfile) {
if ((pid = get_pid (pidfile, quiet)) == -1)
return (quiet ? 0 : -1);
pids = rc_find_pids (NULL, NULL, 0, pid);
} else
pids = rc_find_pids (exec, cmd, uid, pid);
if (! pids)
return (0);
for (i = 0; pids[i]; i++) {
if (test) {
if (! quiet)
einfo ("Would send signal %d to PID %d", sig, pids[i]);
nkilled++;
continue;
}
if (verbose)
ebegin ("Sending signal %d to PID %d", sig, pids[i]);
errno = 0;
killed = (kill (pids[i], sig) == 0 || errno == ESRCH ? true : false);
if (verbose)
eend (killed ? 0 : 1, "%s: failed to send signal %d to PID %d: %s",
applet, sig, pids[i], strerror (errno));
if (! killed) {
nkilled = -1;
} else {
if (nkilled != -1)
nkilled++;
}
}
free (pids);
return (nkilled);
}
static int run_stop_schedule (const char *exec, const char *cmd,
const char *pidfile, uid_t uid,
bool quiet, bool verbose, bool test)
{
schedulelist_t *item = schedule;
int nkilled = 0;
int tkilled = 0;
int nrunning = 0;
long nloops;
struct timespec ts;
if (verbose) {
if (pidfile)
einfo ("Will stop PID in pidfile `%s'", pidfile);
if (uid)
einfo ("Will stop processes owned by UID %d", uid);
if (exec)
einfo ("Will stop processes of `%s'", exec);
if (cmd)
einfo ("Will stop processes called `%s'", cmd);
}
while (item) {
switch (item->type) {
case schedule_goto:
item = item->gotolist;
continue;
case schedule_signal:
nrunning = 0;
nkilled = do_stop (exec, cmd, pidfile, uid, item->value,
quiet, verbose, test);
if (nkilled == 0) {
if (tkilled == 0) {
if (! quiet)
eerror ("%s: no matching processes found", applet);
}
return (tkilled);
}
else if (nkilled == -1)
return (0);
tkilled += nkilled;
break;
case schedule_timeout:
if (item->value < 1) {
item = NULL;
break;
}
nloops = (ONE_SECOND / POLL_INTERVAL) * item->value;
ts.tv_sec = 0;
ts.tv_nsec = POLL_INTERVAL;
while (nloops) {
if ((nrunning = do_stop (exec, cmd, pidfile,
uid, 0, true, false, true)) == 0)
return (true);
if (nanosleep (&ts, NULL) == -1) {
if (errno == EINTR)
eerror ("%s: caught an interrupt", applet);
else {
eerror ("%s: nanosleep: %s", applet, strerror (errno));
return (0);
}
}
nloops --;
}
break;
default:
eerror ("%s: invalid schedule item `%d'", applet, item->type);
return (0);
}
if (item)
item = item->next;
}
if (test || (tkilled > 0 && nrunning == 0))
return (nkilled);
if (! quiet) {
if (nrunning == 1)
eerror ("%s: %d process refused to stop", applet, nrunning);
else
eerror ("%s: %d process(es) refused to stop", applet, nrunning);
}
return (-nrunning);
}
static void handle_signal (int sig)
{
int pid;
int status;
int serrno = errno;
char signame[10] = { '\0' };
switch (sig) {
case SIGINT:
if (! signame[0])
snprintf (signame, sizeof (signame), "SIGINT");
case SIGTERM:
if (! signame[0])
snprintf (signame, sizeof (signame), "SIGTERM");
case SIGQUIT:
if (! signame[0])
snprintf (signame, sizeof (signame), "SIGQUIT");
eerrorx ("%s: caught %s, aborting", applet, signame);
case SIGCHLD:
while (1) {
if ((pid = waitpid (-1, &status, WNOHANG)) < 0) {
if (errno != ECHILD)
eerror ("%s: waitpid: %s", applet, strerror (errno));
break;
}
}
break;
default:
eerror ("%s: caught unknown signal %d", applet, sig);
}
/* Restore errno */
errno = serrno;
}
#include "_usage.h"
#define getoptstring "KN:R:Sbc:d:g:mn:op:s:tu:r:x:1:2:" getoptstring_COMMON
static struct option longopts[] = {
{ "stop", 0, NULL, 'K'},
{ "nicelevel", 1, NULL, 'N'},
{ "retry", 1, NULL, 'R'},
{ "start", 0, NULL, 'S'},
{ "startas", 1, NULL, 'a'},
{ "background", 0, NULL, 'b'},
{ "chuid", 1, NULL, 'c'},
{ "chdir", 1, NULL, 'd'},
{ "group", 1, NULL, 'g'},
{ "make-pidfile", 0, NULL, 'm'},
{ "name", 1, NULL, 'n'},
{ "oknodo", 0, NULL, 'o'},
{ "pidfile", 1, NULL, 'p'},
{ "signal", 1, NULL, 's'},
{ "test", 0, NULL, 't'},
{ "user", 1, NULL, 'u'},
{ "chroot", 1, NULL, 'r'},
{ "exec", 1, NULL, 'x'},
{ "stdout", 1, NULL, '1'},
{ "stderr", 1, NULL, '2'},
longopts_COMMON
};
static const char * const longopts_help[] = {
"Stop daemon",
"Set a nicelevel when starting",
"Retry schedule to use when stopping",
"Start daemon",
"deprecated, use --exec",
"Force daemon to background",
"deprecated, use --user",
"Change the PWD",
"Change the process group",
"Create a pidfile",
"Match process name",
"deprecated",
"Match pid found in this file",
"Send a different signal",
"Test actions, don't do them",
"Change the process user",
"Chroot to this directory",
"Binary to start/stop",
"Redirect stdout to file",
"Redirect stderr to file",
longopts_help_COMMON
};
#include "_usage.c"
int start_stop_daemon (int argc, char **argv)
{
int devnull_fd = -1;
#ifdef TIOCNOTTY
int tty_fd = -1;
#endif
#ifdef HAVE_PAM
pam_handle_t *pamh = NULL;
int pamr;
#endif
int opt;
bool start = false;
bool stop = false;
bool oknodo = false;
bool test = false;
bool quiet;
bool verbose = false;
char *exec = NULL;
char *cmd = NULL;
char *pidfile = NULL;
int sig = SIGTERM;
int nicelevel = 0;
bool background = false;
bool makepidfile = false;
uid_t uid = 0;
gid_t gid = 0;
char *ch_root = NULL;
char *ch_dir = NULL;
int tid = 0;
char *redirect_stderr = NULL;
char *redirect_stdout = NULL;
int stdout_fd;
int stderr_fd;
pid_t pid;
int i;
char *svcname = getenv ("SVCNAME");
char *env;
applet = basename_c (argv[0]);
atexit (cleanup);
signal (SIGINT, handle_signal);
signal (SIGQUIT, handle_signal);
signal (SIGTERM, handle_signal);
if ((env = getenv ("SSD_NICELEVEL")))
if (sscanf (env, "%d", &nicelevel) != 1)
eerror ("%s: invalid nice level `%s' (SSD_NICELEVEL)", applet, env);
while ((opt = getopt_long (argc, argv, getoptstring, longopts,
(int *) 0)) != -1)
switch (opt) {
case 'K': /* --stop */
stop = true;
break;
case 'N': /* --nice */
if (sscanf (optarg, "%d", &nicelevel) != 1)
eerrorx ("%s: invalid nice level `%s'", applet, optarg);
break;
case 'R': /* --retry <schedule>|<timeout> */
parse_schedule (optarg, sig);
break;
case 'S': /* --start */
start = true;
break;
case 'b': /* --background */
background = true;
break;
case 'u': /* --user <username>|<uid> */
case 'c': /* --chuid <username>|<uid> */
{
char *p = optarg;
char *cu = strsep (&p, ":");
struct passwd *pw = NULL;
changeuser = xstrdup (cu);
if (sscanf (cu, "%d", &tid) != 1)
pw = getpwnam (cu);
else
pw = getpwuid (tid);
if (! pw)
eerrorx ("%s: user `%s' not found", applet, cu);
uid = pw->pw_uid;
if (! gid)
gid = pw->pw_gid;
if (p) {
struct group *gr = NULL;
char *cg = strsep (&p, ":");
if (sscanf (cg, "%d", &tid) != 1)
gr = getgrnam (cg);
else
gr = getgrgid (tid);
if (! gr)
eerrorx ("%s: group `%s' not found", applet, cg);
gid = gr->gr_gid;
}
}
break;
case 'd': /* --chdir /new/dir */
ch_dir = optarg;
break;
case 'g': /* --group <group>|<gid> */
{
struct group *gr = getgrnam (optarg);
if (sscanf (optarg, "%d", &tid) != 1)
gr = getgrnam (optarg);
else
gr = getgrgid (tid);
if (! gr)
eerrorx ("%s: group `%s' not found", applet, optarg);
gid = gr->gr_gid;
}
break;
case 'm': /* --make-pidfile */
makepidfile = true;
break;
case 'n': /* --name <process-name> */
cmd = optarg;
break;
case 'o': /* --oknodo */
oknodo = true;
break;
case 'p': /* --pidfile <pid-file> */
pidfile = optarg;
break;
case 's': /* --signal <signal> */
sig = parse_signal (optarg);
break;
case 't': /* --test */
test = true;
break;
case 'r': /* --chroot /new/root */
ch_root = optarg;
break;
case 'a':
case 'x': /* --exec <executable> */
exec = optarg;
break;
case '1': /* --stdout /path/to/stdout.lgfile */
redirect_stdout = optarg;
break;
case '2': /* --stderr /path/to/stderr.logfile */
redirect_stderr = optarg;
break;
case_RC_COMMON_GETOPT
}
quiet = rc_yesno (getenv ("EINFO_QUIET"));
verbose = rc_yesno (getenv ("EINFO_VERBOSE"));
/* Allow start-stop-daemon --signal HUP --exec /usr/sbin/dnsmasq
* instead of forcing --stop --oknodo as well */
if (! start && ! stop)
if (sig != SIGINT &&
sig != SIGTERM &&
sig != SIGQUIT &&
sig != SIGKILL)
{
oknodo = true;
stop = true;
}
if (start == stop)
eerrorx ("%s: need one of --start or --stop", applet);
if (start && ! exec)
eerrorx ("%s: --start needs --exec", applet);
if (stop && ! exec && ! pidfile && ! cmd && ! uid)
eerrorx ("%s: --stop needs --exec, --pidfile, --name or --user", applet);
if (makepidfile && ! pidfile)
eerrorx ("%s: --make-pidfile is only relevant with --pidfile", applet);
if (background && ! start)
eerrorx ("%s: --background is only relevant with --start", applet);
if ((redirect_stdout || redirect_stderr) && ! background)
eerrorx ("%s: --stdout and --stderr are only relevant with --background",
applet);
argc -= optind;
argv += optind;
/* Validate that the binary exists if we are starting */
if (exec && start) {
char *tmp;
if (ch_root)
tmp = rc_strcatpaths (ch_root, exec, (char *) NULL);
else
tmp = exec;
if (! exists (tmp)) {
eerror ("%s: %s does not exist", applet, tmp);
if (ch_root)
free (tmp);
exit (EXIT_FAILURE);
}
if (ch_root)
free (tmp);
}
if (stop) {
int result;
if (! schedule) {
if (test || oknodo)
parse_schedule ("0", sig);
else
parse_schedule (NULL, sig);
}
result = run_stop_schedule (exec, cmd, pidfile, uid, quiet, verbose, test);
if (test || oknodo)
return (result > 0 ? EXIT_SUCCESS : EXIT_FAILURE);
if (result < 1)
exit (result == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
if (pidfile && exists (pidfile))
unlink (pidfile);
if (svcname)
rc_service_daemon_set (svcname, exec, cmd, pidfile, false);
exit (EXIT_SUCCESS);
}
if (do_stop (exec, cmd, pidfile, uid, 0, true, false, true) > 0)
eerrorx ("%s: %s is already running", applet, exec);
if (test) {
if (quiet)
exit (EXIT_SUCCESS);
einfon ("Would start %s", exec);
while (argc-- > 0)
printf("%s ", *argv++);
printf ("\n");
eindent ();
if (uid != 0)
einfo ("as user id %d", uid);
if (gid != 0)
einfo ("as group id %d", gid);
if (ch_root)
einfo ("in root `%s'", ch_root);
if (ch_dir)
einfo ("in dir `%s'", ch_dir);
if (nicelevel != 0)
einfo ("with a priority of %d", nicelevel);
eoutdent ();
exit (EXIT_SUCCESS);
}
/* Ensure this is unset, so if the daemon does /etc/init.d/foo
Then we filter the environment accordingly */
unsetenv ("RC_SOFTLEVEL");
if (verbose) {
ebegin ("Detaching to start `%s'", exec);
eindent ();
}
if (background)
signal (SIGCHLD, handle_signal);
*--argv = exec;
if ((pid = fork ()) == -1)
eerrorx ("%s: fork: %s", applet, strerror (errno));
/* Child process - lets go! */
if (pid == 0) {
pid_t mypid = getpid ();
#ifdef TIOCNOTTY
tty_fd = open("/dev/tty", O_RDWR);
#endif
devnull_fd = open("/dev/null", O_RDWR);
if (nicelevel) {
if (setpriority (PRIO_PROCESS, mypid, nicelevel) == -1)
eerrorx ("%s: setpritory %d: %s", applet, nicelevel,
strerror(errno));
}
if (ch_root && chroot (ch_root) < 0)
eerrorx ("%s: chroot `%s': %s", applet, ch_root, strerror (errno));
if (ch_dir && chdir (ch_dir) < 0)
eerrorx ("%s: chdir `%s': %s", applet, ch_dir, strerror (errno));
if (makepidfile && pidfile) {
FILE *fp = fopen (pidfile, "w");
if (! fp)
eerrorx ("%s: fopen `%s': %s", applet, pidfile, strerror
(errno));
fprintf (fp, "%d\n", mypid);
fclose (fp);
}
#ifdef HAVE_PAM
if (changeuser != NULL)
pamr = pam_start ("start-stop-daemon", changeuser, &conv, &pamh);
else
pamr = pam_start ("start-stop-daemon", "nobody", &conv, &pamh);
if (pamr == PAM_SUCCESS)
pamr = pam_authenticate (pamh, PAM_SILENT);
if (pamr == PAM_SUCCESS)
pamr = pam_acct_mgmt (pamh, PAM_SILENT);
if (pamr == PAM_SUCCESS)
pamr = pam_open_session (pamh, PAM_SILENT);
if (pamr != PAM_SUCCESS)
eerrorx ("%s: pam error: %s", applet, pam_strerror(pamh, pamr));
#endif
if (gid && setgid (gid))
eerrorx ("%s: unable to set groupid to %d", applet, gid);
if (changeuser && initgroups (changeuser, gid))
eerrorx ("%s: initgroups (%s, %d)", applet, changeuser, gid);
if (uid && setuid (uid))
eerrorx ("%s: unable to set userid to %d", applet, uid);
else {
struct passwd *passwd = getpwuid (uid);
if (passwd) {
unsetenv ("HOME");
if (passwd->pw_dir)
setenv ("HOME", passwd->pw_dir, 1);
unsetenv ("USER");
if (passwd->pw_name)
setenv ("USER", passwd->pw_name, 1);
}
}
/* Close any fd's to the passwd database */
endpwent ();
#ifdef TIOCNOTTY
ioctl(tty_fd, TIOCNOTTY, 0);
close(tty_fd);
#endif
/* Clean the environment of any RC_ variables */
STRLIST_FOREACH (environ, env, i) {
if (strncmp (env, "RC_", 3) == 0 ||
strncmp (env, "SSD_NICELEVEL=", strlen ("SSD_NICELEVEL=")) == 0)
continue;
/* For the path, remove the rcscript bin dir from it */
if (strncmp (env, "PATH=", 5) == 0) {
char *path = xstrdup (env);
char *newpath = NULL;
char *p = path;
char *token;
char *np;
int l;
int t;
p += 5;
while ((token = strsep (&p, ":"))) {
if (strcmp (token, RC_LIBDIR "/bin") == 0 ||
strcmp (token, RC_LIBDIR "/sbin") == 0)
continue;
t = strlen (token);
if (newpath) {
l = strlen (newpath);
newpath = xrealloc (newpath, sizeof (char) * (l + t + 2));
np = newpath + l;
*np++ = ':';
memcpy (np, token, sizeof (char) * strlen (token));
np += t;
*np = '\0';
} else {
l = strlen ("PATH=") + t + 1;
newpath = xmalloc (sizeof (char) * l);
snprintf (newpath, l, "PATH=%s", token);
}
}
rc_strlist_add (&newenv, newpath);
free (path);
free (newpath);
} else
rc_strlist_add (&newenv, env);
}
umask (022);
stdout_fd = devnull_fd;
stderr_fd = devnull_fd;
if (redirect_stdout) {
if ((stdout_fd = open (redirect_stdout, O_WRONLY | O_CREAT | O_APPEND,
S_IRUSR | S_IWUSR)) == -1)
eerrorx ("%s: unable to open the logfile for stdout `%s': %s",
applet, redirect_stdout, strerror (errno));
}
if (redirect_stderr) {
if ((stderr_fd = open (redirect_stderr, O_WRONLY | O_CREAT | O_APPEND,
S_IRUSR | S_IWUSR)) == -1)
eerrorx ("%s: unable to open the logfile for stderr `%s': %s",
applet, redirect_stderr, strerror (errno));
}
if (background) {
/* Hmmm, some daemons may need stdin? */
dup2 (devnull_fd, STDIN_FILENO);
dup2 (stdout_fd, STDOUT_FILENO);
dup2 (stderr_fd, STDERR_FILENO);
}
for (i = getdtablesize () - 1; i >= 3; --i)
close(i);
setsid ();
execve (exec, argv, newenv);
#ifdef HAVE_PAM
if (pamr == PAM_SUCCESS)
pam_close_session (pamh, PAM_SILENT);
#endif
eerrorx ("%s: failed to exec `%s': %s", applet, exec, strerror (errno));
}
/* Parent process */
if (! background) {
/* As we're not backgrounding the process, wait for our pid to return */
int status = 0;
int savepid = pid;
errno = 0;
do {
pid = waitpid (savepid, &status, 0);
if (pid < 1) {
eerror ("waitpid %d: %s", savepid, strerror (errno));
return (-1);
}
} while (! WIFEXITED (status) && ! WIFSIGNALED (status));
if (! WIFEXITED (status) || WEXITSTATUS (status) != 0) {
if (! quiet)
eerrorx ("%s: failed to start `%s'", applet, exec);
exit (EXIT_FAILURE);
}
pid = savepid;
}
/* Wait a little bit and check that process is still running
We do this as some badly written daemons fork and then barf */
if (START_WAIT > 0) {
struct timespec ts;
int nloops = START_WAIT / POLL_INTERVAL;
int nloopsp = WAIT_PIDFILE / POLL_INTERVAL;
bool alive = false;
ts.tv_sec = 0;
ts.tv_nsec = POLL_INTERVAL;
while (nloops) {
if (nanosleep (&ts, NULL) == -1) {
if (errno == EINTR)
eerror ("%s: caught an interrupt", applet);
else {
eerror ("%s: nanosleep: %s", applet, strerror (errno));
return (0);
}
}
/* We wait for a specific amount of time for a pidfile to be
* created. Once everything is in place we then wait some more
* to ensure that the daemon really is running and won't abort due
* to a config error. */
if (! background && pidfile && nloopsp)
nloopsp --;
else
nloops --;
/* This is knarly.
If we backgrounded then we know the exact pid.
Otherwise if we have a pidfile then it *may* know the exact pid.
Failing that, we'll have to query processes.
We sleep first as some programs like ntp like to fork, and write
their pidfile a LONG time later. */
if (background) {
if (kill (pid, 0) == 0)
alive = true;
} else {
if (pidfile) {
/* The pidfile may not have been written yet - give it some time */
if (get_pid (pidfile, true) == -1) {
if (! nloopsp)
eerrorx ("%s: did not create a valid pid in `%s'",
applet, pidfile);
alive = true;
} else
nloopsp = 0;
}
if (do_stop (exec, cmd, pidfile, uid, 0, true, false, true) > 0)
alive = true;
}
if (! alive)
eerrorx ("%s: %s died", applet, exec);
}
}
if (svcname)
rc_service_daemon_set (svcname, exec, cmd, pidfile, true);
exit (EXIT_SUCCESS);
}
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