add foreground option

1 files changed, 9 insertions, 2 deletions

diff --git a/gre.c b/gre.c
index 7ec4acd..d66fd36 100644
--- a/gre.c
+++ b/gre.c
@@ -45,6 +45,7 @@ static struct sockaddr_storage remote;
 static size_t remote_len;
 static short type = IFF_TUN;
 static uint8_t mac[6];
+static int foreground;
 
 uint8_t buf[65536];
 
@@ -67,17 +68,21 @@ int main(int argc, char **argv)
     {
         int option_index = 0;
         static struct option long_options[] = {
+            {"foreground", no_argument, 0, 'f' },
             {"tun", no_argument, 0,  'n' },
             {"tap", no_argument, 0,  'p' },
             {0,     0,           0,  0 }
         };
 
-        char c = getopt_long(argc, argv, "np",
+        char c = getopt_long(argc, argv, "fnp",
                              long_options, &option_index);
         if (c == -1)
             break;
 
         switch (c) {
+        case 'f':
+            foreground = 1;
+            break;
         case 'n':
             printf("tun\n");
             type = IFF_TUN;
@@ -143,7 +148,9 @@ int main(int argc, char **argv)
     setnonblock(sock);
     setnonblock(tun);
     runas("nobody");
-    daemonize();
+
+    if (!foreground)
+        daemonize();
 
     int maxfd = (tun > sock ? tun : sock) + 1;
     while (1)