Update.

2004-01-15  Ulrich Drepper  <drepper@redhat.com>

	* resolv/resolv.h: Add RES_USEBSTRING.
	* resolv/res_debug.c (p_option): Add handling for RES_USE_INET6,
	RES_ROTATE, RES_NOCHECKNAME, and RES_USEBSTRING.
	* resolv/res_init.c (res_setioptions): Recognize ip6-bytestring.
	* resolv/nss_dns/dns-host.c (_nss_dns_gethostbyaddr_r): Only perform
	bytestring IPv6 lookup with RES_USEBSTRING option is selected.
	Otherwise use the two nibble formats.

diff --git a/ChangeLog b/ChangeLog
index f28abd9..1ff184e 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2004-01-15  Ulrich Drepper  <drepper@redhat.com>
+
+       * resolv/resolv.h: Add RES_USEBSTRING.
+       * resolv/res_debug.c (p_option): Add handling for RES_USE_INET6,
+       RES_ROTATE, RES_NOCHECKNAME, and RES_USEBSTRING.
+       * resolv/res_init.c (res_setioptions): Recognize ip6-bytestring.
+       * resolv/nss_dns/dns-host.c (_nss_dns_gethostbyaddr_r): Only perform
+       bytestring IPv6 lookup with RES_USEBSTRING option is selected.
+       Otherwise use the two nibble formats.
+
 2004-01-14  Ulrich Drepper  <drepper@redhat.com>
 
        * configure.in: Define HAVE_Z_RELRO if the linker supports -z relro.

diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c
index bde45ca..ab6cc79 100644 (file)
--- a/resolv/nss_dns/dns-host.c
+++ b/resolv/nss_dns/dns-host.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1996-2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 1996-2003, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Extended from original form by Ulrich Drepper <drepper@cygnus.com>, 1996.
 
@@ -298,6 +298,8 @@ _nss_dns_gethostbyaddr_r (const void *addr, socklen_t len, int af,
       return NSS_STATUS_UNAVAIL;
     }
 
+  host_buffer.buf = orig_host_buffer = (querybuf *) alloca (1024);
+
   switch (af)
     {
     case AF_INET:
@@ -305,29 +307,38 @@ _nss_dns_gethostbyaddr_r (const void *addr, socklen_t len, int af,
               (uaddr[2] & 0xff), (uaddr[1] & 0xff), (uaddr[0] & 0xff));
       break;
     case AF_INET6:
-      /* XXX Maybe we need an option to select whether to use the nibble
-        or the bitfield form.  The RFC requires the bitfield form so
-        we use it.  */
+      /* Only lookup with the byte string format if the user wants it.  */
+      if (__builtin_expect (_res.options & RES_USEBSTRING, 0))
+       {
+         qp = stpcpy (qbuf, "\\[x");
+         for (n = 0; n < IN6ADDRSZ; ++n)
+           qp += sprintf (qp, "%02hhx", uaddr[n]);
+         strcpy (qp, "].ip6.arpa");
+         n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR,
+                                host_buffer.buf->buf, 1024, &host_buffer.ptr);
+         if (n >= 0)
+           goto got_it_already;
+       }
       qp = qbuf;
-      qp = stpcpy (qbuf, "\\[x");
-      for (n = 0; n < IN6ADDRSZ; ++n)
-       qp += sprintf (qp, "%02hhx", uaddr[n]);
-      strcpy (qp, "].ip6.arpa");
+      for (n = IN6ADDRSZ - 1; n >= 0; n--)
+       {
+         static const char nibblechar[16] = "0123456789abcdef";
+         *qp++ = nibblechar[uaddr[n] & 0xf];
+         *qp++ = '.';
+         *qp++ = nibblechar[(uaddr[n] >> 4) & 0xf];
+         *qp++ = '.';
+       }
+      strcpy(qp, "ip6.arpa");
       break;
     default:
       /* Cannot happen.  */
       break;
     }
 
-  host_buffer.buf = orig_host_buffer = (querybuf *) alloca (1024);
-
   n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, host_buffer.buf->buf,
                         1024, &host_buffer.ptr);
   if (n < 0 && af == AF_INET6)
     {
-      qp = qbuf;
-      for (n = IN6ADDRSZ - 1; n >= 0; n--)
-       qp += sprintf (qp, "%x.%x.", uaddr[n] & 0xf, (uaddr[n] >> 4) & 0xf);
       strcpy (qp, "ip6.int");
       n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, host_buffer.buf->buf,
                             host_buffer.buf != orig_host_buffer
@@ -342,6 +353,7 @@ _nss_dns_gethostbyaddr_r (const void *addr, socklen_t len, int af,
       return errno == ECONNREFUSED ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND;
     }
 
+ got_it_already:
   status = getanswer_r (host_buffer.buf, n, qbuf, T_PTR, result, buffer, buflen,
                        errnop, h_errnop, 0 /* XXX */);
   if (host_buffer.buf != orig_host_buffer)

diff --git a/resolv/res_debug.c b/resolv/res_debug.c
index 7887dc2..bd1fd33 100644 (file)
--- a/resolv/res_debug.c
+++ b/resolv/res_debug.c
@@ -572,6 +572,10 @@ p_option(u_long option) {
        case RES_DNSRCH:        return "dnsrch";
        case RES_INSECURE1:     return "insecure1";
        case RES_INSECURE2:     return "insecure2";
+       case RES_USE_INET6:     return "inet6";
+       case RES_ROTATE:        return "rotate";
+       case RES_NOCHECKNAME:   return "no-check-names";
+       case RES_USEBSTRING:    return "ip6-bytstring";
                                /* XXX nonreentrant */
        default:                sprintf(nbuf, "?0x%lx?", (u_long)option);
                                return (nbuf);

diff --git a/resolv/res_init.c b/resolv/res_init.c
index e563dcf..cbab7ca 100644 (file)
--- a/resolv/res_init.c
+++ b/resolv/res_init.c
@@ -489,6 +489,9 @@ res_setoptions(res_state statp, const char *options, const char *source) {
 #endif
                } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
                        statp->options |= RES_USE_INET6;
+               } else if (!strncmp(cp, "ip6-bytestring",
+                                   sizeof("ip6-bytestring") - 1)) {
+                       statp->options |= RES_USEBSTRING;
                } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
                        statp->options |= RES_ROTATE;
                } else if (!strncmp(cp, "no-check-names",

diff --git a/resolv/resolv.h b/resolv/resolv.h
index e8f384d..8d37d42 100644 (file)
--- a/resolv/resolv.h
+++ b/resolv/resolv.h
@@ -199,6 +199,8 @@ struct res_sym {
 #define        RES_NOCHECKNAME 0x00008000      /* do not check names for sanity. */
 #define        RES_KEEPTSIG    0x00010000      /* do not strip TSIG records */
 #define        RES_BLAST       0x00020000      /* blast all recursive servers */
+#define RES_USEBSTRING 0x00040000      /* IPv6 reverse lookup with byte
+                                          strings */
 
 #define RES_DEFAULT    (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)