server: Correct handling of interface names in tun interface.

[tripe] / server / tun-linux.c

diff --git a/server/tun-linux.c b/server/tun-linux.c
index 3cfa5d72d03778362fc59eef55163f606e7d8b04..42503548b94ee2bfdf7085fbb3de9769effd1ff1 100644 (file)
--- a/server/tun-linux.c
+++ b/server/tun-linux.c
@@ -46,7 +46,6 @@ struct tunnel {
   const tunnel_ops *ops;               /* Pointer to operations */
   sel_file f;                          /* Selector for TUN/TAP device */
   struct peer *p;                      /* Pointer to my peer */
-  char ifn[IFNAMSIZ];                  /* Interface name buffer */
 };  
 
 /* --- @t_read@ --- *
@@ -68,7 +67,7 @@ static void t_read(int fd, unsigned mode, void *v)
 
   n = read(fd, buf_i, sizeof(buf_i));
   if (n < 0) {
-    a_warn("TUN", "%s", t->ifn, "read-error", "?ERRNO", A_END);
+    a_warn("TUN", "%s", p_ifname(t->p), "read-error", "?ERRNO", A_END);
     return;
   }
   IF_TRACING(T_TUNNEL, {
@@ -94,13 +93,14 @@ static void t_init(void) { return; }
 /* --- @t_create@ --- *
  *
  * Arguments:  @peer *p@ = pointer to peer block
+ *             @char **ifn@ = where to put the interface name
  *
  * Returns:    A tunnel block if it worked, or null on failure.
  *
  * Use:                Initializes a new tunnel.
  */
 
-static tunnel *t_create(peer *p)
+static tunnel *t_create(peer *p, char **ifn)
 {
   int fd;
   int f;
@@ -128,21 +128,12 @@ static tunnel *t_create(peer *p)
   sel_initfile(&sel, &t->f, fd, SEL_READ, t_read, t);
   sel_addfile(&t->f);
   iff.ifr_name[IFNAMSIZ - 1] = 0;
-  strcpy(t->ifn, iff.ifr_name);
+  *ifn = xstrdup(iff.ifr_name);
   T( trace(T_TUNNEL, "tun-linux: attached interface %s to peer `%s'",
-          t->ifn, p_name(p)); )
+          *ifn, p_name(p)); )
   return (t);
 }
 
-/* --- @t_ifname@ --- *
- *
- * Arguments:  @tunnel *t@ = pointer to tunnel block
- *
- * Returns:    A pointer to the tunnel's interface name.
- */
-
-static const char *t_ifname(tunnel *t) { return (t->ifn); }
-
 /* --- @t_inject@ --- *
  *
  * Arguments:  @tunnel *t@ = pointer to tunnel block
@@ -182,7 +173,7 @@ const tunnel_ops tun_linux = {
   "linux",
   t_init,
   t_create,
-  t_ifname,
+  0,
   t_inject,
   t_destroy
 };