add more comments from recent kame.

prepare to swap extended scoped address notation.  fe80::1%de0 is the
most promised candidate, but since it is still very draft, i'm not sure
when to switch - if you have any idea please let me know.  in other words,
do i allowed to change it every week? :-P  (NOTE it is only for "extended"
scoped address notation, which is not for daily use)

1 files changed, 37 insertions, 5 deletions

diff --git a/src/lib/libc/net/getaddrinfo.c b/src/lib/libc/net/getaddrinfo.c
index efcbb72a56..378206e6ee 100644
--- a/src/lib/libc/net/getaddrinfo.c
+++ b/src/lib/libc/net/getaddrinfo.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: getaddrinfo.c,v 1.11 2000/02/15 18:53:08 itojun Exp $ */
+/*      $OpenBSD: getaddrinfo.c,v 1.12 2000/02/16 12:53:35 itojun Exp $ */
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -50,6 +50,25 @@
  *   when globbing NULL hostname (to loopback, or wildcard).  Is it the right
  *   thing to do?  What is the relationship with post-RFC2553 AI_ADDRCONFIG
  *   in ai_flags?
+ * - (post-2553) semantics of AI_ADDRCONFIG itself is too vague.
+ *   (1) what should we do against numeric hostname (2) what should we do
+ *   against NULL hostname (3) what is AI_ADDRCONFIG itself.  AF not ready?
+ *   non-loopback address configured?  global address configured?
+ * - The code makes use of following calls when asked to resolver with
+ *   ai_family  = PF_UNSPEC:
+ *      getipnodebyname(host, AF_INET6);
+ *      getipnodebyname(host, AF_INET);
+ *   This will result in the following queries if the node is configure to
+ *   prefer /etc/hosts than DNS:
+ *      lookup /etc/hosts for IPv6 address
+ *      lookup DNS for IPv6 address
+ *      lookup /etc/hosts for IPv4 address
+ *      lookup DNS for IPv4 address
+ *   which may not meet people's requirement.
+ *   The right thing to happen is to have underlying layer which does
+ *   PF_UNSPEC lookup (lookup both) and return chain of addrinfos.
+ *   This would result in a bit of code duplicate with _dns_ghbyname() and
+ *   friends.
  */
 
 #define INET6
@@ -523,7 +542,7 @@ explore_fqdn(pai, hostname, servname, res)
         for (i = 0; aplist[i] != NULL; i++) {
                 af = hp->h_addrtype;
                 ap = aplist[i];
-#ifdef AF_INET6
+#ifdef INET6
                 if (af == AF_INET6
                  && IN6_IS_ADDR_V4MAPPED((struct in6_addr *)ap)) {
                         af = AF_INET;
@@ -716,7 +735,7 @@ explore_numeric_scope(pai, hostname, servname, res)
         const struct afd *afd;
         struct addrinfo *cur;
         int error;
-        char *cp, *hostname2 = NULL, *scope;
+        char *cp, *hostname2 = NULL, *scope, *addr;
         struct sockaddr_in6 *sin6;
 
         /*
@@ -733,6 +752,7 @@ explore_numeric_scope(pai, hostname, servname, res)
         if (cp == NULL)
                 return explore_numeric(pai, hostname, servname, res);
 
+#if 1
         /*
          * Handle special case of <scope id><delimiter><scoped_address>
          */
@@ -742,9 +762,21 @@ explore_numeric_scope(pai, hostname, servname, res)
         /* terminate at the delimiter */
         hostname2[cp - hostname] = '\0';
         scope = hostname2;
-        cp++;
+        addr = cp + 1;
+#else
+        /*
+         * Handle special case of <scoped_address><delimiter><scope id>
+         */
+        hostname2 = strdup(hostname);
+        if (hostname2 == NULL)
+                return EAI_MEMORY;
+        /* terminate at the delimiter */
+        hostname2[cp - hostname] = '\0';
+        addr = hostname2;
+        scope = cp + 1;
+#endif
 
-        error = explore_numeric(pai, cp, servname, res);
+        error = explore_numeric(pai, addr, servname, res);
         if (error == 0) {
                 int scopeid;