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authorUlrich Drepper <drepper@redhat.com>2004-08-15 20:23:40 +0000
committerUlrich Drepper <drepper@redhat.com>2004-08-15 20:23:40 +0000
commit28977c2c1acb789660ad47e0d88e42486059c916 (patch)
treed1b43dafc0c36dc311a9bbc2177167334ff5354c /resolv/nss_dns
parent1e6d2101ea891d63c11e8ad096f049fbb7e35242 (diff)
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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.
Diffstat (limited to 'resolv/nss_dns')
-rw-r--r--resolv/nss_dns/dns-canon.c137
1 files changed, 137 insertions, 0 deletions
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 <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;
+
+
+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;
+}