Changed execution of tinc-up:

- Do not free() strings that have been putenv()d, see man page of the
  latter.
- Do not set IFNAME anymore, it appears that the ioctl to get the name of
  the interface does not work at all. Since it is set to NETNAME in case
  of tun/tap and it is known beforehand in case of ethertap, there is no
  need for it anyway... (though it would've simplified things).

src/net.c

@@ -17,7 +17,7 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id: net.c,v 1.35.4.67 2000/11/04 22:57:30 guus Exp $
+    $Id: net.c,v 1.35.4.68 2000/11/07 21:43:28 guus Exp $
 */
 
 #include "config.h"
@@ -74,7 +74,6 @@ int keylifetime = 0;
 int keyexpires = 0;
 
 char *unknown = NULL;
-char *interface_name = NULL;  /* Contains the name of the interface */
 
 subnet_t mymac;
 
@@ -82,7 +81,7 @@ subnet_t mymac;
   Execute the given script.
   This function doesn't really belong here.
 */
-int execute_script(const char* name)
+int execute_script(const char *name)
 {
   char *scriptname;
   pid_t pid;
@@ -102,35 +101,28 @@ int execute_script(const char* name)
 
   /* Child here */
 
-  asprintf(&scriptname, "%s/%s", confbase, name);
-  asprintf(&s, "IFNAME=%s", interface_name);
-  putenv(s);
-  free(s);
-
   if(netname)
     {
       asprintf(&s, "NETNAME=%s", netname);
-      putenv(s);
+      putenv(s);	/* Don't free s! see man 3 putenv */
-      free(s);
     }
   else
     {
       unsetenv("NETNAME");
     }
 
-  if(chdir(confbase) < 0)
+  chdir(confbase);	/* This cannot fail since we already read config files from this directory. */
-    {
-      syslog(LOG_ERR, _("Couldn't chdir to `%s': %m"),
-	     confbase);
-    }
   
+  asprintf(&scriptname, "%s/%s", confbase, name);
   execl(scriptname, NULL);
+
   /* No return on success */
   
   if(errno != ENOENT)  /* Ignore if the file does not exist */
     syslog(LOG_WARNING, _("Error executing `%s': %m"), scriptname);
 
   /* No need to free things */
+
   exit(0);
 }
 
@@ -463,18 +455,11 @@ cp
     strncpy(ifr.ifr_name, netname, IFNAMSIZ);
 cp
   if (!ioctl(tap_fd, TUNSETIFF, (void *) &ifr))
-  { 
+  {
     syslog(LOG_INFO, _("%s is a new style tun/tap device"), tapfname);
     taptype = TAP_TYPE_TUNTAP;
   }
 #endif
-
-  /* Add name of network interface to environment (for scripts) */
-
-  ioctl(tap_fd, SIOCGIFNAME, (void *) &ifr);
-  interface_name = xmalloc(strlen(ifr.ifr_name));
-  strcpy(interface_name, ifr.ifr_name);
-  
 cp
   return 0;
 }