From 28977c2c1acb789660ad47e0d88e42486059c916 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Sun, 15 Aug 2004 20:23:40 +0000 Subject: Update. * 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. --- resolv/nss_dns/dns-canon.c | 137 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 137 insertions(+) create mode 100644 resolv/nss_dns/dns-canon.c (limited to 'resolv/nss_dns') diff --git a/resolv/nss_dns/dns-canon.c b/resolv/nss_dns/dns-canon.c new file mode 100644 index 0000000000..e5b38f5e7c --- /dev/null +++ b/resolv/nss_dns/dns-canon.c @@ -0,0 +1,137 @@ +/* Copyright (C) 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper , 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 +#include +#include +#include +#include +#include + + +#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; + + +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; + + int r = __libc_res_nquery (&_res, name, ns_c_in, ns_t_cname, + buf, sizeof (buf), &ansp.ptr); + 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) + || ansp.buf->hdr.ancount == 0) + goto unavail; + + /* 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) + goto unavail; + + /* Skip over the name and the two 16-bit values containing type + and class. */ + ptr += s + 2 * sizeof (uint16_t); + + /* Now the reply. First again the name from the query, then + type, class, TTL, and the length of the RDATA. */ + s = __dn_skipname (ptr, endptr); + if (s < 0) + goto unavail; + + ptr += s; + + /* Check whether type and class match. */ + if (*(uint16_t *) ptr != htons (ns_t_cname)) + goto unavail; + + ptr += sizeof (uint16_t); + if (*(uint16_t *) ptr != htons (ns_c_in)) + goto unavail; + + /* Also skip over the TTL and rdata length. */ + ptr += sizeof (uint16_t) + sizeof (uint32_t) + sizeof (int16_t); + + /* Now the name we are looking for. */ + s = __dn_expand (ansp.buf->buf, endptr, ptr, 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; + } + } + else if (h_errno == TRY_AGAIN) + { + again: + status = NSS_STATUS_TRYAGAIN; + *errnop = errno; + } + else + { + unavail: + status = NSS_STATUS_UNAVAIL; + *errnop = errno; + } + *h_errnop = h_errno; + + if (ansp.ptr != buf) + free (ansp.ptr); + + return status; +} -- cgit v1.2.3