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#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "utils.h"
typedef char pid_str[16];
static int daemonize = 0;
void daemonize_enable(void)
{
daemonize = 1;
}
static int is_daemon_running(char const * const pidfile, pid_str ps)
{
int pfd = open(pidfile, O_RDONLY, 0);
char proc_path[32];
if (pfd < 0)
{
return 0;
}
if (read(pfd, ps, sizeof(pid_str)) <= 0)
{
close(pfd);
return 1;
}
close(pfd);
if (snprintf(proc_path, sizeof(pid_str), "/proc/%s", ps) <= 0)
{
return 1;
}
if (access(proc_path, F_OK) == 0)
{
return 1;
}
return 0;
}
static int create_pidfile(char const * const pidfile)
{
int pfd;
pfd = open(pidfile, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (pfd < 0)
{
syslog(LOG_DAEMON | LOG_ERR, "Could open pidfile %s for writing: %s", pidfile, strerror(errno));
return 1;
}
if (dprintf(pfd, "%d", getpid()) <= 0)
{
close(pfd);
return 1;
}
close(pfd);
return 0;
}
int daemonize_with_pidfile(char const * const pidfile)
{
pid_str ps = {};
if (daemonize != 0)
{
if (is_daemon_running(pidfile, ps) != 0)
{
syslog(LOG_DAEMON | LOG_ERR, "Pidfile %s found and daemon %s still running", pidfile, ps);
return 1;
}
if (daemon(0, 0) != 0)
{
syslog(LOG_DAEMON | LOG_ERR, "daemon: %s", strerror(errno));
return 1;
}
if (create_pidfile(pidfile) != 0)
{
return 1;
}
}
return 0;
}
int daemonize_shutdown(char const * const pidfile)
{
if (daemonize != 0)
{
if (unlink(pidfile) != 0)
{
syslog(LOG_DAEMON | LOG_ERR, "Could not unlink pidfile %s: %s", pidfile, strerror(errno));
return 1;
}
}
return 0;
}
int change_user_group(char const * const user, char const * const group,
char const * const pidfile,
char const * const uds_collector_path,
char const * const uds_distributor_path)
{
struct passwd * pwd;
struct group * grp;
gid_t gid;
if (getuid() != 0) {
return 0;
}
if (user == NULL) {
return 1;
}
pwd = getpwnam(user);
if (pwd == NULL) {
return 1;
}
if (group != NULL) {
grp = getgrnam(group);
if (grp == NULL) {
return 1;
}
gid = grp->gr_gid;
} else {
gid = pwd->pw_gid;
}
if (uds_collector_path != NULL) {
chmod(uds_collector_path, S_IRUSR | S_IWUSR);
chown(uds_collector_path, pwd->pw_uid, gid);
}
if (uds_distributor_path != NULL) {
chmod(uds_distributor_path, S_IRUSR | S_IWUSR | S_IRGRP);
chown(uds_distributor_path, pwd->pw_uid, gid);
}
if (pidfile != NULL) {
chown(pidfile, pwd->pw_uid, gid);
}
return setregid(gid, gid) != 0 || setreuid(pwd->pw_uid, pwd->pw_uid);
}
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