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/* Copyright (C) 2004, 2006, 2008 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <errno.h> #include <netdb.h> #include <resolv.h> #include <stdlib.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); 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 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 the TTL. */ ptr += sizeof (uint16_t) + sizeof (uint32_t); /* Skip over the data length and data. */ ptr += sizeof (uint16_t) + ns_get16 (ptr); } } } out: *h_errnop = h_errno; if (ansp.ptr != buf) free (ansp.ptr); return status; }
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