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|
/*
* rc-misc.c
* rc misc functions
*/
/*
* Copyright (c) 2007-2015 The OpenRC Authors.
* See the Authors file at the top-level directory of this distribution and
* https://github.com/OpenRC/openrc/blob/master/AUTHORS
*
* This file is part of OpenRC. It is subject to the license terms in
* the LICENSE file found in the top-level directory of this
* distribution and at https://github.com/OpenRC/openrc/blob/master/LICENSE
* This file may not be copied, modified, propagated, or distributed
* except according to the terms contained in the LICENSE file.
*/
#include <sys/file.h>
#include <sys/types.h>
#include <sys/utsname.h>
#ifdef __linux__
# include <sys/sysinfo.h>
#endif
#include <sys/time.h>
#include <ctype.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <utime.h>
#include "einfo.h"
#include "queue.h"
#include "rc.h"
#include "rc-misc.h"
#include "version.h"
extern char **environ;
bool
rc_conf_yesno(const char *setting)
{
return rc_yesno(rc_conf_value (setting));
}
static const char *const env_whitelist[] = {
"EERROR_QUIET", "EINFO_QUIET",
"IN_BACKGROUND", "IN_DRYRUN", "IN_HOTPLUG",
"RC_DEBUG", "RC_NODEPS",
"LANG", "LC_MESSAGES", "TERM",
"EINFO_COLOR", "EINFO_VERBOSE",
NULL
};
void
env_filter(void)
{
RC_STRINGLIST *env_allow;
RC_STRINGLIST *profile;
RC_STRINGLIST *env_list;
RC_STRING *env;
char *e;
size_t i = 0;
/* Add the user defined list of vars */
env_allow = rc_stringlist_split(rc_conf_value("rc_env_allow"), " ");
/*
* If '*' is an entry in rc_env_allow, do nothing as we are to pass
* through all environment variables.
*/
if (rc_stringlist_find(env_allow, "*"))
return;
profile = rc_config_load(RC_PROFILE_ENV);
/* Copy the env and work from this so we can manipulate it safely */
env_list = rc_stringlist_new();
while (environ && environ[i]) {
env = rc_stringlist_add(env_list, environ[i++]);
e = strchr(env->value, '=');
if (e)
*e = '\0';
}
TAILQ_FOREACH(env, env_list, entries) {
/* Check the whitelist */
for (i = 0; env_whitelist[i]; i++) {
if (strcmp(env_whitelist[i], env->value) == 0)
break;
}
if (env_whitelist[i])
continue;
/* Check our user defined list */
if (rc_stringlist_find(env_allow, env->value))
continue;
/* OK, not allowed! */
unsetenv(env->value);
}
/* Now add anything missing from the profile */
TAILQ_FOREACH(env, profile, entries) {
e = strchr(env->value, '=');
*e = '\0';
if (!getenv(env->value))
setenv(env->value, e + 1, 1);
}
rc_stringlist_free(env_list);
rc_stringlist_free(env_allow);
rc_stringlist_free(profile);
}
void
env_config(void)
{
size_t pplen = strlen(RC_PATH_PREFIX);
char *path;
char *p;
char *e;
size_t l;
struct utsname uts;
FILE *fp;
char *token;
char *np;
char *npp;
char *tok;
const char *sys = rc_sys();
char *buffer = NULL;
size_t size = 0;
/* Ensure our PATH is prefixed with the system locations first
for a little extra security */
path = getenv("PATH");
if (! path)
setenv("PATH", RC_PATH_PREFIX, 1);
else if (strncmp (RC_PATH_PREFIX, path, pplen) != 0) {
l = strlen(path) + pplen + 3;
e = p = xmalloc(sizeof(char) * l);
p += snprintf(p, l, "%s", RC_PATH_PREFIX);
/* Now go through the env var and only add bits not in our
* PREFIX */
while ((token = strsep(&path, ":"))) {
np = npp = xstrdup(RC_PATH_PREFIX);
while ((tok = strsep(&npp, ":")))
if (strcmp(tok, token) == 0)
break;
if (! tok)
p += snprintf(p, l - (p - e), ":%s", token);
free (np);
}
*p++ = '\0';
unsetenv("PATH");
setenv("PATH", e, 1);
free(e);
}
setenv("RC_VERSION", VERSION, 1);
setenv("RC_LIBEXECDIR", RC_LIBEXECDIR, 1);
setenv("RC_SVCDIR", RC_SVCDIR, 1);
setenv("RC_TMPDIR", RC_SVCDIR "/tmp", 1);
setenv("RC_BOOTLEVEL", RC_LEVEL_BOOT, 1);
e = rc_runlevel_get();
setenv("RC_RUNLEVEL", e, 1);
free(e);
if ((fp = fopen(RC_KRUNLEVEL, "r"))) {
if (getline(&buffer, &size, fp) != -1) {
l = strlen (buffer) - 1;
if (buffer[l] == '\n')
buffer[l] = 0;
setenv("RC_DEFAULTLEVEL", buffer, 1);
}
fclose(fp);
} else
setenv("RC_DEFAULTLEVEL", RC_LEVEL_DEFAULT, 1);
free(buffer);
if (sys)
setenv("RC_SYS", sys, 1);
#ifdef PREFIX
setenv("RC_PREFIX", RC_PREFIX, 1);
#endif
/* Some scripts may need to take a different code path if
Linux/FreeBSD, etc
To save on calling uname, we store it in an environment variable */
if (uname(&uts) == 0)
setenv("RC_UNAME", uts.sysname, 1);
/* Be quiet or verbose as necessary */
if (rc_conf_yesno("rc_quiet"))
setenv("EINFO_QUIET", "YES", 1);
if (rc_conf_yesno("rc_verbose"))
setenv("EINFO_VERBOSE", "YES", 1);
errno = 0;
if ((! rc_conf_yesno("rc_color") && errno == 0) ||
rc_conf_yesno("rc_nocolor"))
setenv("EINFO_COLOR", "NO", 1);
}
int
signal_setup(int sig, void (*handler)(int))
{
struct sigaction sa;
memset(&sa, 0, sizeof (sa));
sigemptyset(&sa.sa_mask);
sa.sa_handler = handler;
return sigaction(sig, &sa, NULL);
}
int
signal_setup_restart(int sig, void (*handler)(int))
{
struct sigaction sa;
memset(&sa, 0, sizeof (sa));
sigemptyset(&sa.sa_mask);
sa.sa_handler = handler;
sa.sa_flags = SA_RESTART;
return sigaction(sig, &sa, NULL);
}
int
svc_lock(const char *applet)
{
char *file = NULL;
int fd;
xasprintf(&file, RC_SVCDIR "/exclusive/%s", applet);
fd = open(file, O_WRONLY | O_CREAT | O_NONBLOCK, 0664);
free(file);
if (fd == -1)
return -1;
if (flock(fd, LOCK_EX | LOCK_NB) == -1) {
eerror("Call to flock failed: %s", strerror(errno));
close(fd);
return -1;
}
return fd;
}
int
svc_unlock(const char *applet, int fd)
{
char *file = NULL;
xasprintf(&file, RC_SVCDIR "/exclusive/%s", applet);
close(fd);
unlink(file);
free(file);
return -1;
}
pid_t
exec_service(const char *service, const char *arg)
{
char *file, sfd[32];
int fd;
pid_t pid = -1;
sigset_t full;
sigset_t old;
struct sigaction sa;
fd = svc_lock(basename_c(service));
if (fd == -1)
return -1;
file = rc_service_resolve(service);
if (!exists(file)) {
rc_service_mark(service, RC_SERVICE_STOPPED);
svc_unlock(basename_c(service), fd);
free(file);
return 0;
}
snprintf(sfd, sizeof(sfd), "%d", fd);
/* We need to block signals until we have forked */
memset(&sa, 0, sizeof (sa));
sa.sa_handler = SIG_DFL;
sigemptyset(&sa.sa_mask);
sigfillset(&full);
sigprocmask(SIG_SETMASK, &full, &old);
if ((pid = fork()) == 0) {
/* Restore default handlers */
sigaction(SIGCHLD, &sa, NULL);
sigaction(SIGHUP, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGQUIT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
sigaction(SIGUSR1, &sa, NULL);
sigaction(SIGWINCH, &sa, NULL);
/* Unmask signals */
sigprocmask(SIG_SETMASK, &old, NULL);
/* Safe to run now */
execl(file, file, "--lockfd", sfd, arg, (char *) NULL);
fprintf(stderr, "unable to exec `%s': %s\n",
file, strerror(errno));
svc_unlock(basename_c(service), fd);
_exit(EXIT_FAILURE);
}
if (pid == -1) {
fprintf(stderr, "fork: %s\n",strerror (errno));
svc_unlock(basename_c(service), fd);
} else
fcntl(fd, F_SETFD, fcntl(fd, F_GETFD, 0) | FD_CLOEXEC);
sigprocmask(SIG_SETMASK, &old, NULL);
free(file);
return pid;
}
int
parse_mode(mode_t *mode, char *text)
{
char *p;
unsigned long l;
/* Check for a numeric mode */
if ((*text - '0') < 8) {
l = strtoul(text, &p, 8);
if (*p || l > 07777U) {
errno = EINVAL;
return -1;
}
*mode = (mode_t) l;
return 0;
}
/* We currently don't check g+w type stuff */
errno = EINVAL;
return -1;
}
int
is_writable(const char *path)
{
if (access(path, W_OK) == 0)
return 1;
return 0;
}
RC_DEPTREE * _rc_deptree_load(int force, int *regen)
{
int fd;
int retval;
int serrno = errno;
int merrno;
time_t t;
char *file = NULL;
struct stat st;
struct utimbuf ut;
FILE *fp;
t = 0;
if (rc_deptree_update_needed(&t, file) || force != 0) {
/* Test if we have permission to update the deptree */
fd = open(RC_DEPTREE_CACHE, O_WRONLY);
merrno = errno;
errno = serrno;
if (fd == -1 && merrno == EACCES)
return rc_deptree_load();
close(fd);
if (regen)
*regen = 1;
ebegin("Caching service dependencies");
retval = rc_deptree_update() ? 0 : -1;
eend (retval, "Failed to update the dependency tree");
if (retval == 0) {
if (stat(RC_DEPTREE_CACHE, &st) != 0) {
eerror("stat(%s): %s", RC_DEPTREE_CACHE, strerror(errno));
return NULL;
}
if (st.st_mtime < t) {
eerror("Clock skew detected with `%s'", file);
eerrorn("Adjusting mtime of `" RC_DEPTREE_CACHE
"' to %s", ctime(&t));
fp = fopen(RC_DEPTREE_SKEWED, "w");
if (fp != NULL) {
fprintf(fp, "%s\n", file);
fclose(fp);
}
ut.actime = t;
ut.modtime = t;
utime(RC_DEPTREE_CACHE, &ut);
} else {
if (exists(RC_DEPTREE_SKEWED))
unlink(RC_DEPTREE_SKEWED);
}
}
if (force == -1 && regen != NULL)
*regen = retval;
}
return rc_deptree_load();
}
static const struct {
const char * const name;
RC_SERVICE bit;
} service_bits[] = {
{ "service_started", RC_SERVICE_STARTED, },
{ "service_stopped", RC_SERVICE_STOPPED, },
{ "service_inactive", RC_SERVICE_INACTIVE, },
{ "service_starting", RC_SERVICE_STARTING, },
{ "service_stopping", RC_SERVICE_STOPPING, },
{ "service_hotplugged", RC_SERVICE_HOTPLUGGED, },
{ "service_wasinactive", RC_SERVICE_WASINACTIVE, },
{ "service_failed", RC_SERVICE_FAILED, },
};
RC_SERVICE lookup_service_state(const char *service)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(service_bits); ++i)
if (!strcmp(service, service_bits[i].name))
return service_bits[i].bit;
return 0;
}
void from_time_t(char *time_string, time_t tv)
{
strftime(time_string, 20, "%Y-%m-%d %H:%M:%S", localtime(&tv));
}
time_t to_time_t(char *timestring)
{
int check = 0;
int year = 0;
int month = 0;
int day = 0;
int hour = 0;
int min = 0;
int sec = 0;
struct tm breakdown = {0};
time_t result = -1;
check = sscanf(timestring, "%4d-%2d-%2d %2d:%2d:%2d",
&year, &month, &day, &hour, &min, &sec);
if (check == 6) {
breakdown.tm_year = year - 1900; /* years since 1900 */
breakdown.tm_mon = month - 1;
breakdown.tm_mday = day;
breakdown.tm_hour = hour;
breakdown.tm_min = min;
breakdown.tm_sec = sec;
breakdown.tm_isdst = -1;
result = mktime(&breakdown);
}
return result;
}
pid_t get_pid(const char *applet,const char *pidfile)
{
FILE *fp;
pid_t pid;
if (! pidfile)
return -1;
if ((fp = fopen(pidfile, "r")) == NULL) {
ewarnv("%s: fopen `%s': %s", applet, pidfile, strerror(errno));
return -1;
}
if (fscanf(fp, "%d", &pid) != 1) {
ewarnv("%s: no pid found in `%s'", applet, pidfile);
fclose(fp);
return -1;
}
fclose(fp);
return pid;
}
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