added -4 and -6 switches to udp socket

6 files changed, 35 insertions, 31 deletions

diff --git a/README b/README
index b8944e4..47022ee 100644
--- a/README
+++ b/README
@@ -1,6 +1,10 @@
 Dependencies
 ============
 
+uAnytun can be built by using either libgcrypt or the openssl-crypto library. 
+The latter is more performant in most cases but there are some license 
+issues when using this library. It also needs more space when installed.
+
 Linux
 -----
 
@@ -58,6 +62,3 @@ Notes:
     because openssl had no SHA256 implementation prior to this
     version
   - on OpenBSD you have to use gmake instead of make
-  - currently there is no support for using IPv6 as
-    outer Protocol on OpenBSD because it does not support
-    V4-Mapped adresses
diff --git a/src/configure b/src/configure
index 3d630e9..d112494 100755
--- a/src/configure
+++ b/src/configure
@@ -51,8 +51,8 @@ print_usage() {
   echo "          --use-ssl-crypto          use ssl crypto library instead of libgcrypt"
   echo "          --disable-crypto          disable crypto at all (only NULL cipher)"
   echo "          --disable-passphrase      disable master key and salt passphrase"
-  echo "          --disable-v4-mapped       disable V4-Mapped addresses (until now this means"
-  echo "                                    to disable IPv6 as outer protocol)"
+  echo "          --disable-v4-mapped       disable V4-Mapped addresses (this means to disable"
+  echo "                                    simultanious use of IPv4 and IPv6)"
 }
 
 for arg
@@ -136,8 +136,8 @@ if [ $PASSPHRASE -eq 0 ]; then
 fi
 
 if [ $V4_MAPPED -eq 0 ]; then
-  CFLAGS=$CFLAGS' -DNO_UDPV6'
-  echo "WARNING: disabling V4 mapped addresses, this prevents uanytun from using IPv6 as outer Protocol"
+  CFLAGS=$CFLAGS' -DNO_V4MAPPED'
+  echo "WARNING: disabling V4 mapped addresses, this prevents uanytun from using IPv6 and IPv4 Sockets at the same time"
 fi
 
 if [ "x$PREFIX" = "x/usr" ]; then
diff --git a/src/options.c b/src/options.c
index cad58ff..d8327db 100644
--- a/src/options.c
+++ b/src/options.c
@@ -277,7 +277,7 @@ void options_parse_post(options_t* opt)
     return;
 
 #ifdef NO_V4MAPPED
-  if(resolv_addr_type_ == any) {
+  if(opt->resolv_addr_type_ == ANY) {
     opt->resolv_addr_type_ = IPV4_ONLY;
     log_printf(WARNING, "No support for V4-mapped Adresses on this platform, defaulting to only use IPv4 addresses");
   }
diff --git a/src/uanytun.c b/src/uanytun.c
index 6e276bf..380dca5 100644
--- a/src/uanytun.c
+++ b/src/uanytun.c
@@ -412,7 +412,7 @@ int main(int argc, char* argv[])
 
 
   udp_socket_t sock;
-  ret = udp_init(&sock, opt.local_addr_, opt.local_port_);
+  ret = udp_init(&sock, opt.local_addr_, opt.local_port_, opt.resolv_addr_type_);
   if(ret) {
     log_printf(ERROR, "error on udp_init, exitting");
     tun_close(&dev);
@@ -428,7 +428,7 @@ int main(int argc, char* argv[])
 
 
   if(opt.remote_addr_) {
-    if(!udp_set_remote(&sock, opt.remote_addr_, opt.remote_port_)) {
+    if(!udp_set_remote(&sock, opt.remote_addr_, opt.remote_port_, opt.resolv_addr_type_)) {
       char* remote_string = udp_get_remote_end_string(&sock);
       if(remote_string) {
         log_printf(NOTICE, "set remote end to: %s", remote_string);
diff --git a/src/udp.c b/src/udp.c
index d17ffef..e75e1ef 100644
--- a/src/udp.c
+++ b/src/udp.c
@@ -47,7 +47,7 @@
 #include <arpa/inet.h>
 #include <netinet/in.h>
 
-int udp_init(udp_socket_t* sock, const char* local_addr, const char* port)
+int udp_init(udp_socket_t* sock, const char* local_addr, const char* port, resolv_addr_type_t resolv_type)
 {
   if(!sock || !port) 
     return -1;
@@ -64,11 +64,11 @@ int udp_init(udp_socket_t* sock, const char* local_addr, const char* port)
   hints.ai_socktype = SOCK_DGRAM;
   hints.ai_flags |= AI_PASSIVE;
 
-#ifdef NO_UDPV6
-  hints.ai_family = PF_INET;
-#else
-  hints.ai_family = PF_UNSPEC;
-#endif
+  switch(resolv_type) {
+  case IPV4_ONLY: hints.ai_family = PF_INET; break;
+  case IPV6_ONLY: hints.ai_family = PF_INET6; break;
+  default: hints.ai_family = PF_UNSPEC; break;
+  }
 
   int errcode = getaddrinfo(local_addr, port, &hints, &res);
   if (errcode != 0) {
@@ -101,12 +101,20 @@ int udp_init(udp_socket_t* sock, const char* local_addr, const char* port)
     return -1;
   }
   
+#ifdef NO_V4MAPPED
+  if(res->ai_family == AF_INET6) {
+    log_printf(NOTICE, "disabling V4-Mapped addresses");
+    int on = 1;
+    if(setsockopt(sock->fd_, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)))
+      log_printf(ERROR, "Error on setting IPV6_V6ONLY socket option: %m");
+  }
+#endif
   freeaddrinfo(res);
 
   return 0;
 }
 
-int udp_set_remote(udp_socket_t* sock, const char* remote_addr, const char* port)
+int udp_set_remote(udp_socket_t* sock, const char* remote_addr, const char* port, resolv_addr_type_t resolv_type)
 {
   if(!sock || !remote_addr || !port) 
     return -1;
@@ -117,11 +125,11 @@ int udp_set_remote(udp_socket_t* sock, const char* remote_addr, const char* port
   memset (&hints, 0, sizeof (hints));
   hints.ai_socktype = SOCK_DGRAM;
 
-#ifdef NO_UDPV6
-  hints.ai_family = PF_INET;
-#else
-  hints.ai_family = PF_UNSPEC;
-#endif
+  switch(resolv_type) {
+  case IPV4_ONLY: hints.ai_family = PF_INET; break;
+  case IPV6_ONLY: hints.ai_family = PF_INET6; break;
+  default: hints.ai_family = PF_UNSPEC; break;
+  }
 
   int errcode = getaddrinfo(remote_addr, port, &hints, &res);
   if (errcode != 0) {
@@ -164,14 +172,12 @@ char* udp_endpoint_to_string(udp_endpoint_t e)
     addrstr_len = INET_ADDRSTRLEN + 1;
     addrport_sep = ':';
     break;
-#ifndef NO_UDPV6
   case AF_INET6:
     ptr = &((struct sockaddr_in6 *)&e)->sin6_addr;
     port = ntohs(((struct sockaddr_in6 *)&e)->sin6_port);
     addrstr_len = INET6_ADDRSTRLEN + 1;
     addrport_sep = '.';
     break;
-#endif
   default:
     asprintf(&ret, "unknown address type");
     return ;
diff --git a/src/udp.h b/src/udp.h
index d7ff5fd..aacdae8 100644
--- a/src/udp.h
+++ b/src/udp.h
@@ -35,15 +35,12 @@
 #ifndef _UDP_H_
 #define _UDP_H_
 
+#include "options.h"
+
 #include <sys/types.h>
 #include <sys/socket.h>
 
-#ifdef NO_UDPV6
-#include <netinet/in.h>
-typedef struct sockaddr_in udp_endpoint_t;
-#else
 typedef struct sockaddr_storage udp_endpoint_t;
-#endif
 
 struct udp_socket_struct {
   int fd_;
@@ -53,8 +50,8 @@ struct udp_socket_struct {
 };
 typedef struct udp_socket_struct udp_socket_t;
 
-int udp_init(udp_socket_t* sock, const char* local_addr, const char* port);
-int udp_set_remote(udp_socket_t* sock, const char* remote_addr, const char* port);
+int udp_init(udp_socket_t* sock, const char* local_addr, const char* port, resolv_addr_type_t resolv_type);
+int udp_set_remote(udp_socket_t* sock, const char* remote_addr, const char* port, resolv_addr_type_t resolv_type);
 void udp_close(udp_socket_t* sock);
 
 char* udp_endpoint_to_string(udp_endpoint_t e);