From 0ca7cafb96022e8a681019cbdb7a21adfa344fc1 Mon Sep 17 00:00:00 2001
From: Brian Somers <brian@FreeBSD.org>
Date: Thu, 8 Jan 1998 23:47:57 +0000
Subject: Zap any addresses on the network side of the `tun' as soon as we've
 successfully opened the /dev side.

---
 usr.sbin/ppp/main.c |  3 ++-
 usr.sbin/ppp/os.c   | 37 ++++++++++++++++++++++++++++++++++++-
 usr.sbin/ppp/os.h   |  3 ++-
 3 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/usr.sbin/ppp/main.c b/usr.sbin/ppp/main.c
index f782e7f7197d..d57d9bd2828d 100644
--- a/usr.sbin/ppp/main.c
+++ b/usr.sbin/ppp/main.c
@@ -17,7 +17,7 @@
  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  *
- * $Id: main.c,v 1.114 1997/12/28 21:55:04 brian Exp $
+ * $Id: main.c,v 1.115 1997/12/30 23:22:29 brian Exp $
  *
  *	TODO:
  *		o Add commands for traffic summary, version display, etc.
@@ -428,6 +428,7 @@ main(int argc, char **argv)
     LogPrintf(LogWARN, "OpenTunnel: %s\n", strerror(errno));
     return EX_START;
   }
+  CleanInterface(IfDevName);
   if (mode & MODE_INTER)
     fprintf(VarTerm, "Interactive mode\n");
   else if ((mode & MODE_OUTGOING_DAEMON) && !(mode & MODE_DEDICATED))
diff --git a/usr.sbin/ppp/os.c b/usr.sbin/ppp/os.c
index 2f3944167786..221a675608ce 100644
--- a/usr.sbin/ppp/os.c
+++ b/usr.sbin/ppp/os.c
@@ -17,7 +17,7 @@
  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  *
- * $Id: os.c,v 1.37 1997/12/13 02:37:27 brian Exp $
+ * $Id: os.c,v 1.38 1997/12/24 09:29:09 brian Exp $
  *
  */
 #include <sys/param.h>
@@ -170,6 +170,41 @@ SetIpDevice(struct in_addr myaddr,
   return (0);
 }
 
+int
+CleanInterface(const char *name)
+{
+  int s;
+
+  s = ID0socket(AF_INET, SOCK_DGRAM, 0);
+  if (s < 0) {
+    LogPrintf(LogERROR, "SetIpDevice: socket(): %s\n", strerror(errno));
+    return (-1);
+  }
+  strncpy(ifrq.ifr_name, name, sizeof ifrq.ifr_name - 1);
+  ifrq.ifr_name[sizeof ifrq.ifr_name - 1] = '\0';
+  while (ID0ioctl(s, SIOCGIFADDR, &ifrq) == 0) {
+    memset(&ifra.ifra_mask, '\0', sizeof ifra.ifra_mask);
+    ifra.ifra_addr = ifrq.ifr_addr;
+    if (ID0ioctl(s, SIOCGIFDSTADDR, &ifrq) < 0) {
+      if (ifra.ifra_addr.sa_family == AF_INET)
+        LogPrintf(LogERROR, "tun_configure: Can't get dst for %s on %s !\n",
+                  inet_ntoa(((struct sockaddr_in *)&ifra.ifra_addr)->sin_addr),
+                  name);
+      return 0;
+    }
+    ifra.ifra_broadaddr = ifrq.ifr_dstaddr;
+    if (ID0ioctl(s, SIOCDIFADDR, &ifra) < 0) {
+      if (ifra.ifra_addr.sa_family == AF_INET)
+        LogPrintf(LogERROR, "tun_configure: Can't delete %s address on %s !\n",
+                  inet_ntoa(((struct sockaddr_in *)&ifra.ifra_addr)->sin_addr),
+                  name);
+      return 0;
+    }
+  }
+
+  return 1;
+}
+
 int
 OsTrySetIpaddress(struct in_addr myaddr, struct in_addr hisaddr)
 {
diff --git a/usr.sbin/ppp/os.h b/usr.sbin/ppp/os.h
index 7d6cc5e2a79e..7c0b5f10ee22 100644
--- a/usr.sbin/ppp/os.h
+++ b/usr.sbin/ppp/os.h
@@ -15,7 +15,7 @@
  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  *
- * $Id: os.h,v 1.12 1997/11/22 03:37:42 brian Exp $
+ * $Id: os.h,v 1.13 1997/12/13 02:37:30 brian Exp $
  *
  *	TODO:
  */
@@ -29,3 +29,4 @@ extern int  OpenTunnel(int *);
 extern void OsLinkup(void);
 extern int  OsLinkIsUp(void);
 extern void OsLinkdown(void);
+extern int  CleanInterface(const char *);
-- 
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