[syslinux] Making tftpd (hpa) firewall frienldy

[cgm mgc]

Hello all,

 Tested on linux 2.6.18 (Centos5) and FreeBSD 7.0.

You would execute it like below (which basically makes tftp reply back with
same port is listening on )
tftpd --port-range 69:69 -4 -s /tftpboot/


--- tftp-hpa-0.49/tftpd/tftpd.c       2008-10-21 01:08:31.000000000 +0300
+++ tftp-hpa-0.49-tftpd-reuseport.c 2010-03-03 15:19:26.000000000 +0200
@@ -524,6 +524,11 @@
 #ifndef __CYGWIN__
             set_socket_nonblock(fd4, 1);
 #endif
+   { int x = 1; setsockopt (fd4, SOL_SOCKET, SO_REUSEADDR, &x, sizeof (x));
}
+#ifdef SO_REUSEPORT
+   { int x = 1; setsockopt (fd4, SOL_SOCKET, SO_REUSEPORT , &x, sizeof
(x)); }
+#endif
+
             memset(&bindaddr4, 0, sizeof bindaddr4);
             bindaddr4.sin_family = AF_INET;
             bindaddr4.sin_addr.s_addr = INADDR_ANY;
@@ -900,6 +905,14 @@
         syslog(LOG_ERR, "socket: %m");
         exit(EX_IOERR);
     }
+   { int x = 1; setsockopt (peer, SOL_SOCKET, SO_REUSEADDR, &x, sizeof
(x)); }
+#ifdef SO_REUSEPORT
+   { int x = 1; setsockopt (peer, SOL_SOCKET, SO_REUSEPORT , &x, sizeof
(x)); }
+#endif
+    if (pick_port_bind(peer, &myaddr, portrange_from, portrange_to) < 0) {
+        syslog(LOG_ERR, "bind: %m");
+        exit(EX_IOERR);
+    }

     /* Set up the supplementary group access list if possible */
     /* /etc/group still need to be accessible at this point */
@@ -947,10 +960,6 @@
     }

     /* Process the request... */
-    if (pick_port_bind(peer, &myaddr, portrange_from, portrange_to) < 0) {
-        syslog(LOG_ERR, "bind: %m");
-        exit(EX_IOERR);
-    }

     if (connect(peer, &from.sa, SOCKLEN(&from)) < 0) {
         syslog(LOG_ERR, "connect: %m");