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#include "daemon.h"
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <sys/types.h>
#include <grp.h>
#include <pwd.h>
#include <string.h>
Daemon::Daemon()
{}
Daemon::~Daemon()
{}
int Daemon::run(const char *user, const char* group)
{
int f;
int fd;
int uid = -1;
struct passwd *p = getpwent();
while(p) {
if(strcmp(p->pw_name, user) == 0) uid = p->pw_uid;
p = getpwent();
}
if(uid == -1) {
fprintf(stderr, "Could not find user \"%s\" in /etc/passwd file.\n", user);
}
int gid = -1;
struct group *g = getgrent();
while(g) {
if(strcmp(g->gr_name, group) == 0) gid = g->gr_gid;
g = getgrent();
}
if(gid == -1) {
fprintf(stderr, "Could not find group \"%s\" in /etc/group file.\n", group);
}
chdir("/");
umask(0);
f = fork();
switch(f) {
case -1:
perror("Fork in daemon.cc");
return 1;
case 0:
if(setgid(gid) != 0) {
fprintf(stderr, "Failed to change to group \"%s\" (gid: %d), quitting.\n", group, gid);
perror("");
fprintf(stderr, "Runnning daemon as current group\n");
}
if(setuid(uid) != 0) {
fprintf(stderr, "Failed to change to user \"%s\" (uid: %d), quitting.\n", user, uid);
perror("");
fprintf(stderr, "Runnning daemon as current user\n");
}
fd = open("/dev/null", O_NOCTTY | O_RDWR, 0666);
dup2(0, fd);
dup2(1, fd);
dup2(2, fd);
setsid();
signal (SIGTERM, SIG_IGN);
signal (SIGINT, SIG_IGN);
signal (SIGHUP, SIG_IGN);
return daemon_main();
default:
return 0;
}
}
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