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#include "daemon.h"
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <grp.h>
#include <pwd.h>
#include <string.h>
static gid_t get_gid(const char *grp)
{
char *eptr;
gid_t xid = strtoul(grp, &eptr, 10);
struct group *gr;
errno = 0;
if(!*eptr)
gr = getgrgid(xid);
else
gr = getgrnam(grp);
return !gr ? 0 : gr->gr_gid;
}
static uid_t get_uid(const char *usr, gid_t *gid)
{
char *eptr;
uid_t xid = strtoul(usr, &eptr, 10);
struct passwd *pw;
errno = 0;
if(!*eptr)
pw = getpwuid(xid);
else
pw = getpwnam(usr);
if(!pw)
return 0;
if(!gid)
*gid = pw->pw_gid;
return pw->pw_uid;
}
Daemon::Daemon()
{}
Daemon::~Daemon()
{}
int Daemon::run(const char *user, const char* group, bool detach,
std::string pidfile)
{
gid_t gid = 0;
uid_t uid = 0;
if(user && *user) {
uid = get_uid(user, &gid);
if(errno) {
fprintf(stderr, "Could resolve user \"%s\"", user);
perror("");
}
}
if(group && *group) {
gid = get_gid(group);
if(errno) {
fprintf(stderr, "Could not resolve group \"%s\"", group);
perror("");
}
}
umask(0);
if(detach) {
if(daemon(0, 0) == -1) {
perror("");
return -1;
}
}
if(pidfile != "" ) {
pid_t pid = getpid();
FILE *fp = fopen(pidfile.c_str(), "w");
if(fp == NULL) {
fprintf(stderr, "Could not write pid file \"%s\"", pidfile.c_str());
perror("");
return -1;
} else {
fprintf(fp, "%lu", (unsigned long int)pid);
fclose(fp);
}
}
if(gid) {
if(setgid(gid) != 0) {
fprintf(stderr, "Failed to change to group \"%s\" (gid: %d).\n",
group, gid);
perror("");
fprintf(stderr, "Runnning daemon as current group\n");
}
}
if(uid) {
if(setuid(uid) != 0) {
fprintf(stderr, "Failed to change to user \"%s\" (uid: %d).\n",
user, uid);
perror("");
fprintf(stderr, "Runnning daemon as current user\n");
}
}
setsid();
signal (SIGTERM, SIG_IGN);
int ret = daemon_main();
if(pidfile != "") {
unlink(pidfile.c_str());
}
return ret;
}
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