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authordeva <deva>2006-03-04 14:53:17 +0000
committerdeva <deva>2006-03-04 14:53:17 +0000
commitf02095ee5ceb78f1781a9e250693b8866ca42181 (patch)
tree7953c6b5f004f31ee9b340d7cdff5e85890594fc /lib/daemon.cc
parent71c713dce2b5128862b293aa7fcc1d7ee89ffaf1 (diff)
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * daemon.cc
+ *
+ * Thu Jun 9 10:27:59 CEST 2005
+ * Copyright 2005 Bent Bisballe
+ * deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "daemon.h"
+
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+
+// For getgrent and getgrent
+#include <sys/types.h>
+#include <grp.h>
+#include <pwd.h>
+
+// For strcmp
+#include <string.h>
+
+Daemon::Daemon()
+{}
+
+Daemon::~Daemon()
+{}
+
+int Daemon::run(const char *user, const char* group)
+{
+ int f;
+ int fd;
+
+ // Fetch user id
+ 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);
+ }
+
+ // Fetch group id
+ 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: // Fork error
+ perror("Fork in daemon.cc");
+ return 1;
+
+ case 0: // Forked child
+ // Switch to given group
+ 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");
+ }
+
+ // Switch to given user
+ 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");
+ }
+
+ // Redirect stdin, stdout and stderr to /dev/null
+ 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: // Parent
+ // exit(0);
+ return 0;
+ }
+}