initial checkin of c-implementaion of door_damon

[svn42.git] / door_daemon / sysexec.h

diff --git a/door_daemon/sysexec.h b/door_daemon/sysexec.h
new file mode 100644 (file)
index 0000000..b724433
--- /dev/null
+++ b/door_daemon/sysexec.h
@@ -0,0 +1,77 @@
+/*
+ *  uAnytun
+ *
+ *  uAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
+ *  featured implementation uAnytun has no support for multiple connections
+ *  or synchronisation. It is a small single threaded implementation intended
+ *  to act as a client on small platforms.
+ *  The secure anycast tunneling protocol (satp) defines a protocol used
+ *  for communication between any combination of unicast and anycast
+ *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
+ *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
+ *  ethernet, ip, arp ...). satp directly includes cryptography and
+ *  message authentication based on the methodes used by SRTP.  It is
+ *  intended to deliver a generic, scaleable and secure solution for
+ *  tunneling and relaying of packets of any protocol.
+ *  
+ *
+ *  Copyright (C) 2007-2008 Christian Pointner <equinox@anytun.org>
+ *
+ *  This file is part of uAnytun.
+ *
+ *  uAnytun is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 3 as
+ *  published by the Free Software Foundation.
+ *
+ *  uAnytun 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 uAnytun. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SYSEXEC_H_
+#define _SYSEXEC_H_
+
+int exec_script(const char* script, const char* ifname)
+{
+  if(!script || !ifname)
+    return -1;
+
+  pid_t pid;
+  pid = fork();
+  if(!pid) {
+    int fd;
+    for (fd=getdtablesize();fd>=0;--fd) // close all file descriptors
+      close(fd);
+
+    fd = open("/dev/null",O_RDWR);        // stdin
+    if(fd == -1)
+      log_printf(WARNING,  "can't open stdin");
+    else {
+      if(dup(fd) == -1)   // stdout
+        log_printf(WARNING,  "can't open stdout");
+      if(dup(fd) == -1)   // stderr
+        log_printf(WARNING,  "can't open stderr");
+    }
+    execl("/bin/sh", "/bin/sh", script, ifname, NULL);
+        // if execl return, an error occurred
+    log_printf(ERROR, "error on executing script: %s", strerror(errno));
+    return -1;
+  }
+  int status = 0;
+  waitpid(pid, &status, 0);
+  if(WIFEXITED(status))
+    log_printf(NOTICE, "script '%s' returned %d", script, WEXITSTATUS(status));  
+  else if(WIFSIGNALED(status))
+    log_printf(NOTICE, "script '%s' terminated after signal %d", script, WTERMSIG(status));
+  else
+    log_printf(ERROR, "executing script: unkown error");
+
+  return status;
+
+}
+
+#endif