From e7b22a000c65536c397242f9f0c6e5c2ac6a3281 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@anytun.org>
Date: Wed, 4 Feb 2009 00:27:29 +0000
Subject: added linux support for new ifconfig usage

---
 src/bsd/tun.c    |  5 ++++-
 src/linux/tun.c  | 35 ++++++++++++++++++-----------------
 src/tun.h        |  1 +
 src/tun_helper.h | 14 ++++++++++++++
 4 files changed, 37 insertions(+), 18 deletions(-)

diff --git a/src/bsd/tun.c b/src/bsd/tun.c
index 3eac360..07eae2b 100644
--- a/src/bsd/tun.c
+++ b/src/bsd/tun.c
@@ -226,6 +226,9 @@ void tun_close(tun_device_t* dev)
 
   if(dev->net_addr_)
     free(dev->net_addr_);
+
+  if(dev->net_mask_)
+    free(dev->net_mask_);
 }
 
 int tun_read(tun_device_t* dev, u_int8_t* buf, u_int32_t len)
@@ -280,7 +283,7 @@ int tun_write(tun_device_t* dev, u_int8_t* buf, u_int32_t len)
 
 void tun_do_ifconfig(tun_device_t* dev)
 {
-  if(!dev || !dev->actual_name_ || !dev->net_addr_)
+  if(!dev || !dev->actual_name_ || !dev->net_addr_ || !dev->net_mask_)
     return;
 
 
diff --git a/src/linux/tun.c b/src/linux/tun.c
index d8044b5..1d21eda 100644
--- a/src/linux/tun.c
+++ b/src/linux/tun.c
@@ -32,6 +32,8 @@
  *  along with ľAnytun. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <stdio.h>
+
 #include "datatypes.h"
 
 #include "tun.h"
@@ -126,6 +128,9 @@ void tun_close(tun_device_t* dev)
 
   if(dev->net_addr_)
     free(dev->net_addr_);
+
+  if(dev->net_mask_)
+    free(dev->net_mask_);
 }
 
 int tun_read(tun_device_t* dev, u_int8_t* buf, u_int32_t len)
@@ -180,25 +185,21 @@ int tun_write(tun_device_t* dev, u_int8_t* buf, u_int32_t len)
 
 void tun_do_ifconfig(tun_device_t* dev)
 {
-  if(!dev || !dev->actual_name_ || !dev->net_addr_)
+  if(!dev || !dev->actual_name_ || !dev->net_addr_ || !dev->net_mask_)
     return;
 
-/*   char* command = NULL; */
-/*   if(dev->type_ == TYPE_TUN) */
-/*     asprintf(&command, "/sbin/ifconfig %s %s pointopoint %s mtu %d", dev->actual_name_, dev->local_, dev->remote_netmask_, dev->mtu_); */
-/*   else */
-/*     asprintf(&command, "/sbin/ifconfig %s %s netmask %s mtu %d", dev->actual_name_, dev->local_, dev->remote_netmask_, dev->mtu_); */
-
-/*   if(!command) { */
-/*     log_printf(ERR, "Execution of ifconfig failed"); */
-/*     return; */
-/*   } */
+  char* command = NULL;
+  asprintf(&command, "/sbin/ifconfig %s %s netmask %s mtu %d", dev->actual_name_, dev->net_addr_, dev->net_mask_, dev->mtu_);
+  if(!command) {
+    log_printf(ERR, "Execution of ifconfig failed");
+    return;
+  }
 
-/*   int result = system(command); */
-/*   if(result == -1) */
-/*     log_printf(ERR, "Execution of ifconfig failed"); */
-/*   else */
-/*     log_printf(NOTICE, "ifconfig returned %d", WEXITSTATUS(result)); */
+  int result = system(command);
+  if(result == -1)
+    log_printf(ERR, "Execution of ifconfig failed");
+  else
+    log_printf(NOTICE, "ifconfig returned %d", WEXITSTATUS(result));
 
-/*   free(command); */
+  free(command);
 }
diff --git a/src/tun.h b/src/tun.h
index fd6765b..99f41f8 100644
--- a/src/tun.h
+++ b/src/tun.h
@@ -47,6 +47,7 @@ struct tun_device_struct {
   device_type_t type_;
   u_int16_t mtu_;
   char* net_addr_;
+  char* net_mask_;
   u_int16_t prefix_length_;
 };
 typedef struct tun_device_struct tun_device_t;
diff --git a/src/tun_helper.h b/src/tun_helper.h
index 47c8033..db5fd6a 100644
--- a/src/tun_helper.h
+++ b/src/tun_helper.h
@@ -36,6 +36,9 @@
 #define _TUN_HELPER_H_
 
 #include <string.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
 
 void tun_conf(tun_device_t* dev, const char* dev_name, const char* dev_type, const char* ifcfg_addr, u_int16_t ifcfg_prefix, u_int16_t mtu)
 {
@@ -57,10 +60,21 @@ void tun_conf(tun_device_t* dev, const char* dev_name, const char* dev_type, con
   }
 
   dev->net_addr_ = NULL;
+  dev->net_mask_ = NULL;
   dev->prefix_length_ = 0;
   if(ifcfg_addr) {
     dev->net_addr_ = strdup(ifcfg_addr);
     dev->prefix_length_ = ifcfg_prefix;
+
+    u_int32_t mask = 0;
+    u_int16_t i = 0;
+    for(i = 0; i < ifcfg_prefix; ++i) {
+      mask = mask >> 1;
+      mask |= 0x80000000L;
+    }
+    struct in_addr addr;
+    addr.s_addr = ntohl(mask);
+    dev->net_mask_ = strdup(inet_ntoa(addr));
   }
 }
 
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