1 files changed, 118 insertions, 0 deletions
diff --git a/miavd/daemon.cc b/miavd/daemon.cc
new file mode 100644
index 0000000..6e46bd5
--- /dev/null
+++ b/miavd/daemon.cc
@@ -0,0 +1,118 @@
+/* -*- 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;
+  }
+}