28977c2c1a
* sysdeps/posix/getaddrinfo.c (gaih_addrtuple): Change type of addr to avoid casts. (gethosts): Removed. (gethosts2): Renamed to gethosts. Make it usable for family != AF_UNSPEC. Fix AI_V4MAPPED. (gaih_inet): Remove use of old gethosts. Always use what used to be gethosts2. If entry is found, try to use the same NSS module's getcanonname_r function. Use gethostbyaddr for AI_CANONNAME only if getcanonname_r was not available. Fix filtering of AI_V4MAPPED addresses. Numerous cleanups. * resolv/nss_dns/dns-canon.c: New file. * resolv/Makefile (libnss_dns-routines): Add dns-canon. * resolv/Versions (libnss_dns): Add _nss_dns_getcanonname_r. * elf/Makefile: Add rules to build and run tst-dlopenrpath. * elf/tst-dlopenrpath.c: New file. * elf/tst-dlopenrpathmod.c: New file. * intl/tst-gettext.sh: Adjust for change of de.po file to UTF-8.
138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/* Copyright (C) 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2004.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <stdlib.h>
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#include <arpa/nameser.h>
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#include <nsswitch.h>
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#if PACKETSZ > 65536
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# define MAXPACKET PACKETSZ
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#else
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# define MAXPACKET 65536
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#endif
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/* We need this time later. */
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typedef union querybuf
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{
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HEADER hdr;
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unsigned char buf[MAXPACKET];
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} querybuf;
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enum nss_status
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_nss_dns_getcanonname_r (const char *name, char *buffer, size_t buflen,
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char **result,int *errnop, int *h_errnop)
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{
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/* Just an alibi buffer, res_nquery will allocate a real buffer for
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us. */
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unsigned char buf[20];
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union
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{
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querybuf *buf;
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unsigned char *ptr;
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} ansp = { .ptr = buf };
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enum nss_status status;
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int r = __libc_res_nquery (&_res, name, ns_c_in, ns_t_cname,
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buf, sizeof (buf), &ansp.ptr);
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if (r > 0)
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{
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/* We need to decode the response. Just one question record.
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And if we got no answers we bail out, too. */
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if (ansp.buf->hdr.qdcount != htons (1)
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|| ansp.buf->hdr.ancount == 0)
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goto unavail;
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/* Beginning and end of the buffer with query, answer, and the
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rest. */
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unsigned char *ptr = &ansp.buf->buf[sizeof (HEADER)];
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unsigned char *endptr = ansp.ptr + r;
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/* Skip over the query. This is the name, type, and class. */
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int s = __dn_skipname (ptr, endptr);
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if (s < 0)
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goto unavail;
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/* Skip over the name and the two 16-bit values containing type
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and class. */
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ptr += s + 2 * sizeof (uint16_t);
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/* Now the reply. First again the name from the query, then
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type, class, TTL, and the length of the RDATA. */
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s = __dn_skipname (ptr, endptr);
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if (s < 0)
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goto unavail;
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ptr += s;
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/* Check whether type and class match. */
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if (*(uint16_t *) ptr != htons (ns_t_cname))
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goto unavail;
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ptr += sizeof (uint16_t);
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if (*(uint16_t *) ptr != htons (ns_c_in))
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goto unavail;
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/* Also skip over the TTL and rdata length. */
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ptr += sizeof (uint16_t) + sizeof (uint32_t) + sizeof (int16_t);
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/* Now the name we are looking for. */
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s = __dn_expand (ansp.buf->buf, endptr, ptr, buffer, buflen);
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if (s < 0)
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{
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if (errno != EMSGSIZE)
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goto unavail;
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/* The buffer is too small. */
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*errnop = ERANGE;
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status = NSS_STATUS_TRYAGAIN;
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h_errno = NETDB_INTERNAL;
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}
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else
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{
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/* Success. */
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*result = buffer;
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status = NSS_STATUS_SUCCESS;
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}
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}
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else if (h_errno == TRY_AGAIN)
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{
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again:
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status = NSS_STATUS_TRYAGAIN;
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*errnop = errno;
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}
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else
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{
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unavail:
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status = NSS_STATUS_UNAVAIL;
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*errnop = errno;
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}
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*h_errnop = h_errno;
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if (ansp.ptr != buf)
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free (ansp.ptr);
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return status;
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}
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