From d759331ef32bbf0908bce4d8753293ef08bbbfed Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@anytun.org>
Date: Mon, 29 Dec 2008 06:13:48 +0000
Subject: improved signal handling

---
 src/signal.c  | 30 ++++++------------------------
 src/signal.h  |  5 ++++-
 src/uanytun.c | 14 +++++++++++++-
 3 files changed, 23 insertions(+), 26 deletions(-)

diff --git a/src/signal.c b/src/signal.c
index 1086969..122577d 100644
--- a/src/signal.c
+++ b/src/signal.c
@@ -42,10 +42,9 @@ volatile sig_atomic_t signal_exit = 0;
 
 void signal_init()
 {
-  signal(SIGINT, handle_signal_exit);
-  signal(SIGQUIT, handle_signal_exit);
-  signal(SIGTERM, handle_signal_exit);
-
+  signal(SIGINT, handle_signal);
+  signal(SIGQUIT, handle_signal);
+  signal(SIGTERM, handle_signal);
   signal(SIGHUP, handle_signal);
   signal(SIGUSR1, handle_signal);
   signal(SIGUSR2, handle_signal);
@@ -54,29 +53,12 @@ void signal_init()
 void handle_signal(int sig)
 {
   switch(sig) {
+  case SIGINT: log_printf(NOTICE, "SIG-Int caught, exitting"); signal_exit = 1; break;
+  case SIGQUIT: log_printf(NOTICE, "SIG-Quit caught, exitting"); signal_exit = 1; break;
+  case SIGTERM: log_printf(NOTICE, "SIG-Term caught, exitting"); signal_exit = 1; break;
   case SIGHUP: log_printf(NOTICE, "SIG-Hup caught"); break;
   case SIGUSR1: log_printf(NOTICE, "SIG-Usr1 caught"); break;
   case SIGUSR2: log_printf(NOTICE, "SIG-Usr2 caught"); break;
   default: log_printf(NOTICE, "Signal %d caught, ignoring", sig); break;
   }
 }
-
-void handle_signal_exit(int sig)
-{
-  switch(sig) {
-  case SIGINT: log_printf(NOTICE, "SIG-Int caught, exitting"); break;
-  case SIGQUIT: log_printf(NOTICE, "SIG-Quit caught, exitting"); break;
-  case SIGTERM: log_printf(NOTICE, "SIG-Term caught, exitting"); break;
-  default: log_printf(NOTICE, "Signal %d caught, ignoring", sig); return;
-  }
-
-  if (signal_exit)
-    raise (sig);
-  signal_exit = 1;
- 
-  // do cleanup here
-
-  signal (sig, SIG_DFL);
-  raise (sig);
-}
-
diff --git a/src/signal.h b/src/signal.h
index 3dd0440..328f849 100644
--- a/src/signal.h
+++ b/src/signal.h
@@ -35,8 +35,11 @@
 #ifndef _SIGNAL_H_
 #define _SIGNAL_H_
 
+#include <signal.h>
+
+extern volatile sig_atomic_t signal_exit;
+
 void signal_init();
 void handle_signal(int sig);
-void handle_signal_exit(int sig);
 
 #endif
diff --git a/src/uanytun.c b/src/uanytun.c
index d76c468..0d47e8f 100644
--- a/src/uanytun.c
+++ b/src/uanytun.c
@@ -37,6 +37,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <errno.h>
 
 #include "log.h"
 #include "signal.h"
@@ -83,13 +84,19 @@ int main_loop(tun_device_t* dev, udp_socket_t* sock, options_t* opt)
     int nfds = dev->fd_ > sock->fd_ ? dev->fd_+1 : sock->fd_+1;
 
     int ret = select(nfds, &readfds, NULL, NULL, NULL);
-    if(ret == -1) {
+    if(ret == -1 && errno != EINTR) {
       log_printf(ERR, "select returned with error: %m");
+      cipher_close(&c);      
       return -1;
     }
     if(!ret)
       continue;
 
+    if(signal_exit) {
+      cipher_close(&c);
+      return 1;
+    }
+
     if(FD_ISSET(dev->fd_, &readfds)) {
       len = tun_read(dev, plain_packet_get_payload(&plain_packet), plain_packet_get_payload_length(&plain_packet));
       plain_packet_set_payload_length(&plain_packet, len);
@@ -231,6 +238,11 @@ int main(int argc, char* argv[])
 
   if(!ret)
     log_printf(NOTICE, "normal shutdown");
+  else if(ret < 0)
+    log_printf(NOTICE, "shutdown after error");
+  else
+    log_printf(NOTICE, "shutdown after signal");
+
 
   return ret;
 }
-- 
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