diff options
Diffstat (limited to 'resolv/nss_dns')
| -rw-r--r-- | resolv/nss_dns/dns-host.c | 38 |
1 files changed, 25 insertions, 13 deletions
diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c index bde45ca873..ab6cc792b8 100644 --- 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) |