diff options
Diffstat (limited to 'resolv/nss_dns/dns-canon.c')
| -rw-r--r-- | resolv/nss_dns/dns-canon.c | 173 |
1 files changed, 0 insertions, 173 deletions
diff --git a/resolv/nss_dns/dns-canon.c b/resolv/nss_dns/dns-canon.c deleted file mode 100644 index 4276eb6542..0000000000 --- a/resolv/nss_dns/dns-canon.c +++ /dev/null @@ -1,173 +0,0 @@ -/* Copyright (C) 2004-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@redhat.com>, 2004. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#include <errno.h> -#include <netdb.h> -#include <resolv.h> -#include <stdlib.h> -#include <stdint.h> -#include <arpa/nameser.h> -#include <nsswitch.h> - - -#if PACKETSZ > 65536 -# define MAXPACKET PACKETSZ -#else -# define MAXPACKET 65536 -#endif - - -/* We need this time later. */ -typedef union querybuf -{ - HEADER hdr; - unsigned char buf[MAXPACKET]; -} querybuf; - - -static const short int qtypes[] = { ns_t_a, ns_t_aaaa }; -#define nqtypes (sizeof (qtypes) / sizeof (qtypes[0])) - - -enum nss_status -_nss_dns_getcanonname_r (const char *name, char *buffer, size_t buflen, - char **result,int *errnop, int *h_errnop) -{ - /* Just an alibi buffer, res_nquery will allocate a real buffer for - us. */ - unsigned char buf[20]; - union - { - querybuf *buf; - unsigned char *ptr; - } ansp = { .ptr = buf }; - enum nss_status status = NSS_STATUS_UNAVAIL; - - for (int i = 0; i < nqtypes; ++i) - { - int r = __libc_res_nquery (&_res, name, ns_c_in, qtypes[i], - buf, sizeof (buf), &ansp.ptr, NULL, NULL, - NULL, NULL); - if (r > 0) - { - /* We need to decode the response. Just one question record. - And if we got no answers we bail out, too. */ - if (ansp.buf->hdr.qdcount != htons (1)) - continue; - - /* Number of answers. */ - unsigned int ancount = ntohs (ansp.buf->hdr.ancount); - - /* Beginning and end of the buffer with query, answer, and the - rest. */ - unsigned char *ptr = &ansp.buf->buf[sizeof (HEADER)]; - unsigned char *endptr = ansp.ptr + r; - - /* Skip over the query. This is the name, type, and class. */ - int s = __dn_skipname (ptr, endptr); - if (s < 0) - { - unavail: - status = NSS_STATUS_UNAVAIL; - break; - } - - /* Skip over the name and the two 16-bit values containing type - and class. */ - ptr += s + 2 * sizeof (uint16_t); - - while (ancount-- > 0) - { - /* Now the reply. First again the name from the query, - then type, class, TTL, and the length of the RDATA. - We remember the name start. */ - unsigned char *namestart = ptr; - s = __dn_skipname (ptr, endptr); - if (s < 0) - goto unavail; - - ptr += s; - - /* Check that there are enough bytes for the RR - metadata. */ - if (endptr - ptr < 10) - goto unavail; - - /* Check whether type and class match. */ - uint_fast16_t type; - NS_GET16 (type, ptr); - if (type == qtypes[i]) - { - /* We found the record. */ - s = __dn_expand (ansp.buf->buf, endptr, namestart, - buffer, buflen); - if (s < 0) - { - if (errno != EMSGSIZE) - goto unavail; - - /* The buffer is too small. */ - *errnop = ERANGE; - status = NSS_STATUS_TRYAGAIN; - h_errno = NETDB_INTERNAL; - } - else - { - /* Success. */ - *result = buffer; - status = NSS_STATUS_SUCCESS; - } - - goto out; - } - - if (type != ns_t_cname) - goto unavail; - - if (__ns_get16 (ptr) != ns_c_in) - goto unavail; - - /* Also skip over class and TTL. */ - ptr += sizeof (uint16_t) + sizeof (uint32_t); - - /* Skip over RDATA length and RDATA itself. */ - uint16_t rdatalen = __ns_get16 (ptr); - ptr += sizeof (uint16_t); - /* Not enough room for RDATA. */ - if (endptr - ptr < rdatalen) - goto unavail; - ptr += rdatalen; - } - } - - /* Restore original buffer before retry. */ - if (ansp.ptr != buf) - { - free (ansp.ptr); - ansp.ptr = buf; - } - } - - out: - *h_errnop = h_errno; - - if (ansp.ptr != buf) - free (ansp.ptr); - - return status; -} |