/* Hosts file parser in nss_files module.
- Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1996-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ 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
- Library General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ 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 <assert.h>
#include <netinet/in.h>
STRING_FIELD (addr, isspace, 1);
/* Parse address. */
- if (inet_pton (af, addr, entdata->host_addr) <= 0
- && (af != AF_INET6 || (flags & AI_V4MAPPED) == 0
- || inet_pton (AF_INET, addr, entdata->host_addr) <= 0
- || (map_v4v6_address ((char *) entdata->host_addr,
- (char *) entdata->host_addr),
- 0)))
- /* Illegal address: ignore line. */
- return 0;
+ if (inet_pton (af == AF_UNSPEC ? AF_INET : af, addr, entdata->host_addr)
+ > 0)
+ af = af == AF_UNSPEC ? AF_INET : af;
+ else
+ {
+ if (af == AF_INET6 && (flags & AI_V4MAPPED) != 0
+ && inet_pton (AF_INET, addr, entdata->host_addr) > 0)
+ map_v4v6_address ((char *) entdata->host_addr,
+ (char *) entdata->host_addr);
+ else if (af == AF_INET
+ && inet_pton (AF_INET6, addr, entdata->host_addr) > 0)
+ {
+ if (IN6_IS_ADDR_V4MAPPED (entdata->host_addr))
+ memcpy (entdata->host_addr, entdata->host_addr + 12, INADDRSZ);
+ else if (IN6_IS_ADDR_LOOPBACK (entdata->host_addr))
+ {
+ in_addr_t localhost = htonl (INADDR_LOOPBACK);
+ memcpy (entdata->host_addr, &localhost, sizeof (localhost));
+ }
+ else
+ /* Illegal address: ignore line. */
+ return 0;
+ }
+ else if (af == AF_UNSPEC
+ && inet_pton (AF_INET6, addr, entdata->host_addr) > 0)
+ af = AF_INET6;
+ else
+ /* Illegal address: ignore line. */
+ return 0;
+ }
/* We always return entries of the requested form. */
result->h_addrtype = af;
result->h_length = af == AF_INET ? INADDRSZ : IN6ADDRSZ;
/* Store a pointer to the address in the expected form. */
- entdata->h_addr_ptrs[0] = entdata->host_addr;
+ entdata->h_addr_ptrs[0] = (char *) entdata->host_addr;
entdata->h_addr_ptrs[1] = NULL;
result->h_addr_list = entdata->h_addr_ptrs;
STRING_FIELD (result->h_name, isspace, 1);
})
-
-
-#define HOST_DB_LOOKUP(name, keysize, keypattern, break_if_match, proto...) \
-enum nss_status \
-_nss_files_get##name##_r (proto, \
- struct STRUCTURE *result, char *buffer, \
- size_t buflen, int *errnop H_ERRNO_PROTO) \
-{ \
- enum nss_status status; \
- \
- __libc_lock_lock (lock); \
- \
- /* Reset file pointer to beginning or open file. */ \
- status = internal_setent (keep_stream); \
- \
- if (status == NSS_STATUS_SUCCESS) \
- { \
- /* Tell getent function that we have repositioned the file pointer. */ \
- last_use = getby; \
- \
- while ((status = internal_getent (result, buffer, buflen, errnop \
- H_ERRNO_ARG EXTRA_ARGS_VALUE)) \
- == NSS_STATUS_SUCCESS) \
- { break_if_match } \
- \
- if (status == NSS_STATUS_SUCCESS \
- && _res_hconf.flags & HCONF_FLAG_MULTI) \
- { \
- /* We have to get all host entries from the file. */ \
- const size_t tmp_buflen = MIN (buflen, 4096); \
- char tmp_buffer[tmp_buflen]; \
- struct hostent tmp_result_buf; \
- int naddrs = 1; \
- int naliases = 0; \
- char *bufferend; \
- \
- while (result->h_aliases[naliases] != NULL) \
- ++naliases; \
- \
- bufferend = (char *) &result->h_aliases[naliases + 1]; \
- \
- while ((status = internal_getent (&tmp_result_buf, tmp_buffer, \
- tmp_buflen, errnop H_ERRNO_ARG \
- EXTRA_ARGS_VALUE)) \
- == NSS_STATUS_SUCCESS) \
- { \
- int matches = 1; \
- struct hostent *old_result = result; \
- result = &tmp_result_buf; \
- /* The following piece is a bit clumsy but we want to use the \
- `break_if_match' value. The optimizer should do its \
- job. */ \
- do \
- { \
- break_if_match \
- result = old_result; \
- } \
- while ((matches = 0)); \
- \
- if (matches) \
- { \
- /* We could be very clever and try to recycle a few bytes \
- in the buffer instead of generating new arrays. But \
- we are not doing this here since it's more work than \
- it's worth. Simply let the user provide a bit bigger \
- buffer. */ \
- char **new_h_addr_list; \
- char **new_h_aliases; \
- int newaliases = 0; \
- size_t newstrlen = 0; \
- int cnt; \
- \
- /* Count the new aliases and the length of the strings. */ \
- while (tmp_result_buf.h_aliases[newaliases] != NULL) \
- { \
- char *cp = tmp_result_buf.h_aliases[newaliases]; \
- ++newaliases; \
- newstrlen += strlen (cp) + 1; \
- } \
- /* If the real name is different add it also to the \
- aliases. This means that there is a duplication \
- in the alias list but this is really the users \
- problem. */ \
- if (strcmp (old_result->h_name, \
- tmp_result_buf.h_name) != 0) \
- { \
- ++newaliases; \
- newstrlen += strlen (tmp_result_buf.h_name) + 1; \
- } \
- \
- /* Now we can check whether the buffer is large enough. */ \
- if (bufferend + 16 + (naddrs + 2) * sizeof (char *) \
- + roundup (newstrlen, sizeof (char *)) \
- + (naliases + newaliases + 1) * sizeof (char *) \
- >= buffer + buflen) \
- { \
- *errnop = ERANGE; \
- status = NSS_STATUS_TRYAGAIN; \
- break; \
- } \
- \
- new_h_addr_list = \
- (char **) (bufferend \
- + roundup (newstrlen, sizeof (char *)) \
- + 16); \
- new_h_aliases = \
- (char **) ((char *) new_h_addr_list \
- + (naddrs + 2) * sizeof (char *)); \
- \
- /* Copy the old data in the new arrays. */ \
- for (cnt = 0; cnt < naddrs; ++cnt) \
- new_h_addr_list[cnt] = old_result->h_addr_list[cnt]; \
- \
- for (cnt = 0; cnt < naliases; ++cnt) \
- new_h_aliases[cnt] = old_result->h_aliases[cnt]; \
- \
- /* Store the new strings. */ \
- cnt = 0; \
- while (tmp_result_buf.h_aliases[cnt] != NULL) \
- { \
- new_h_aliases[naliases++] = bufferend; \
- bufferend = (__stpcpy (bufferend, \
- tmp_result_buf.h_aliases[cnt]) \
- + 1); \
- } \
- \
- if (cnt < newaliases) \
- { \
- new_h_aliases[naliases++] = bufferend; \
- bufferend = __stpcpy (bufferend, \
- tmp_result_buf.h_name) + 1; \
- } \
- \
- /* Final NULL pointer. */ \
- new_h_aliases[naliases] = NULL; \
- \
- /* Round up the buffer end address. */ \
- bufferend += (sizeof (char *) \
- - ((bufferend - (char *) 0) \
- % sizeof (char *))); \
- \
- /* Now the new address. */ \
- new_h_addr_list[naddrs++] = \
- memcpy (bufferend, tmp_result_buf.h_addr, \
- tmp_result_buf.h_length); \
- \
- /* Also here a final NULL pointer. */ \
- new_h_addr_list[naddrs] = NULL; \
- \
- /* Store the new array pointers. */ \
- old_result->h_aliases = new_h_aliases; \
- old_result->h_addr_list = new_h_addr_list; \
- \
- /* Compute the new buffer end. */ \
- bufferend = (char *) &new_h_aliases[naliases + 1]; \
- assert (bufferend <= buffer + buflen); \
- } \
- } \
- \
- if (status != NSS_STATUS_TRYAGAIN) \
- status = NSS_STATUS_SUCCESS; \
- } \
- \
- \
- if (! keep_stream) \
- internal_endent (); \
- } \
- \
- __libc_lock_unlock (lock); \
- \
- return status; \
-}
-
-
#define EXTRA_ARGS_VALUE \
, ((_res.options & RES_USE_INET6) ? AF_INET6 : AF_INET), \
((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0)
#include "files-XXX.c"
-HOST_DB_LOOKUP (hostbyname, ,,
- {
- LOOKUP_NAME_CASE (h_name, h_aliases)
- }, const char *name)
-
-
#undef EXTRA_ARGS_VALUE
-/* XXX Is using _res to determine whether we want to convert IPv4 addresses
- to IPv6 addresses really the right thing to do? */
-#define EXTRA_ARGS_VALUE \
- , af, ((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0)
-HOST_DB_LOOKUP (hostbyname2, ,,
- {
- LOOKUP_NAME_CASE (h_name, h_aliases)
- }, const char *name, int af)
-DB_LOOKUP (hostbyaddr, ,,
+/* We only need to consider IPv4 mapped addresses if the input to the
+ gethostbyaddr() function is an IPv6 address. */
+#define EXTRA_ARGS_VALUE \
+ , af, (len == IN6ADDRSZ ? AI_V4MAPPED : 0)
+DB_LOOKUP (hostbyaddr, ,,,
{
- if (result->h_length == len
+ if (result->h_length == (int) len
&& ! memcmp (addr, result->h_addr_list[0], len))
break;
}, const void *addr, socklen_t len, int af)
-
#undef EXTRA_ARGS_VALUE
-#define EXTRA_ARGS_VALUE \
- , af, flags
-HOST_DB_LOOKUP (ipnodebyname, ,,
+
+enum nss_status
+_nss_files_gethostbyname3_r (const char *name, int af, struct hostent *result,
+ char *buffer, size_t buflen, int *errnop,
+ int *herrnop, int32_t *ttlp, char **canonp)
+{
+ uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct hostent_data);
+ buffer += pad;
+ buflen = buflen > pad ? buflen - pad : 0;
+
+ __libc_lock_lock (lock);
+
+ /* Reset file pointer to beginning or open file. */
+ enum nss_status status = internal_setent (keep_stream);
+
+ if (status == NSS_STATUS_SUCCESS)
+ {
+ /* XXX Is using _res to determine whether we want to convert IPv4
+ addresses to IPv6 addresses really the right thing to do? */
+ int flags = ((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0);
+
+ /* Tell getent function that we have repositioned the file pointer. */
+ last_use = getby;
+
+ while ((status = internal_getent (result, buffer, buflen, errnop,
+ herrnop, af, flags))
+ == NSS_STATUS_SUCCESS)
+ {
+ LOOKUP_NAME_CASE (h_name, h_aliases)
+ }
+
+ if (status == NSS_STATUS_SUCCESS
+ && _res_hconf.flags & HCONF_FLAG_MULTI)
+ {
+ /* We have to get all host entries from the file. */
+ size_t tmp_buflen = MIN (buflen, 4096);
+ char tmp_buffer_stack[tmp_buflen]
+ __attribute__ ((__aligned__ (__alignof__ (struct hostent_data))));
+ char *tmp_buffer = tmp_buffer_stack;
+ struct hostent tmp_result_buf;
+ int naddrs = 1;
+ int naliases = 0;
+ char *bufferend;
+ bool tmp_buffer_malloced = false;
+
+ while (result->h_aliases[naliases] != NULL)
+ ++naliases;
+
+ bufferend = (char *) &result->h_aliases[naliases + 1];
+
+ again:
+ while ((status = internal_getent (&tmp_result_buf, tmp_buffer,
+ tmp_buflen, errnop, herrnop, af,
+ flags))
+ == NSS_STATUS_SUCCESS)
+ {
+ int matches = 1;
+ struct hostent *old_result = result;
+ result = &tmp_result_buf;
+ /* The following piece is a bit clumsy but we want to use the
+ `LOOKUP_NAME_CASE' value. The optimizer should do its
+ job. */
+ do
{
LOOKUP_NAME_CASE (h_name, h_aliases)
- }, const char *name, int af, int flags)
+ result = old_result;
+ }
+ while ((matches = 0));
+
+ if (matches)
+ {
+ /* We could be very clever and try to recycle a few bytes
+ in the buffer instead of generating new arrays. But
+ we are not doing this here since it's more work than
+ it's worth. Simply let the user provide a bit bigger
+ buffer. */
+ char **new_h_addr_list;
+ char **new_h_aliases;
+ int newaliases = 0;
+ size_t newstrlen = 0;
+ int cnt;
+
+ /* Count the new aliases and the length of the strings. */
+ while (tmp_result_buf.h_aliases[newaliases] != NULL)
+ {
+ char *cp = tmp_result_buf.h_aliases[newaliases];
+ ++newaliases;
+ newstrlen += strlen (cp) + 1;
+ }
+ /* If the real name is different add it also to the
+ aliases. This means that there is a duplication
+ in the alias list but this is really the user's
+ problem. */
+ if (strcmp (old_result->h_name,
+ tmp_result_buf.h_name) != 0)
+ {
+ ++newaliases;
+ newstrlen += strlen (tmp_result_buf.h_name) + 1;
+ }
+
+ /* Make sure bufferend is aligned. */
+ assert ((bufferend - (char *) 0) % sizeof (char *) == 0);
+
+ /* Now we can check whether the buffer is large enough.
+ 16 is the maximal size of the IP address. */
+ if (bufferend + 16 + (naddrs + 2) * sizeof (char *)
+ + roundup (newstrlen, sizeof (char *))
+ + (naliases + newaliases + 1) * sizeof (char *)
+ >= buffer + buflen)
+ {
+ *errnop = ERANGE;
+ *herrnop = NETDB_INTERNAL;
+ status = NSS_STATUS_TRYAGAIN;
+ goto out;
+ }
+
+ new_h_addr_list =
+ (char **) (bufferend
+ + roundup (newstrlen, sizeof (char *))
+ + 16);
+ new_h_aliases =
+ (char **) ((char *) new_h_addr_list
+ + (naddrs + 2) * sizeof (char *));
+
+ /* Copy the old data in the new arrays. */
+ for (cnt = 0; cnt < naddrs; ++cnt)
+ new_h_addr_list[cnt] = old_result->h_addr_list[cnt];
+
+ for (cnt = 0; cnt < naliases; ++cnt)
+ new_h_aliases[cnt] = old_result->h_aliases[cnt];
+
+ /* Store the new strings. */
+ cnt = 0;
+ while (tmp_result_buf.h_aliases[cnt] != NULL)
+ {
+ new_h_aliases[naliases++] = bufferend;
+ bufferend = (__stpcpy (bufferend,
+ tmp_result_buf.h_aliases[cnt])
+ + 1);
+ ++cnt;
+ }
+
+ if (cnt < newaliases)
+ {
+ new_h_aliases[naliases++] = bufferend;
+ bufferend = __stpcpy (bufferend,
+ tmp_result_buf.h_name) + 1;
+ }
+
+ /* Final NULL pointer. */
+ new_h_aliases[naliases] = NULL;
+
+ /* Round up the buffer end address. */
+ bufferend += (sizeof (char *)
+ - ((bufferend - (char *) 0)
+ % sizeof (char *))) % sizeof (char *);
+
+ /* Now the new address. */
+ new_h_addr_list[naddrs++] =
+ memcpy (bufferend, tmp_result_buf.h_addr,
+ tmp_result_buf.h_length);
+
+ /* Also here a final NULL pointer. */
+ new_h_addr_list[naddrs] = NULL;
+
+ /* Store the new array pointers. */
+ old_result->h_aliases = new_h_aliases;
+ old_result->h_addr_list = new_h_addr_list;
+
+ /* Compute the new buffer end. */
+ bufferend = (char *) &new_h_aliases[naliases + 1];
+ assert (bufferend <= buffer + buflen);
+
+ result = old_result;
+ }
+ }
+
+ if (status == NSS_STATUS_TRYAGAIN)
+ {
+ size_t newsize = 2 * tmp_buflen;
+ if (tmp_buffer_malloced)
+ {
+ char *newp = realloc (tmp_buffer, newsize);
+ if (newp != NULL)
+ {
+ assert ((((uintptr_t) newp)
+ & (__alignof__ (struct hostent_data) - 1))
+ == 0);
+ tmp_buffer = newp;
+ tmp_buflen = newsize;
+ goto again;
+ }
+ }
+ else if (!__libc_use_alloca (buflen + newsize))
+ {
+ tmp_buffer = malloc (newsize);
+ if (tmp_buffer != NULL)
+ {
+ assert ((((uintptr_t) tmp_buffer)
+ & (__alignof__ (struct hostent_data) - 1))
+ == 0);
+ tmp_buffer_malloced = true;
+ tmp_buflen = newsize;
+ goto again;
+ }
+ }
+ else
+ {
+ tmp_buffer
+ = extend_alloca (tmp_buffer, tmp_buflen,
+ newsize
+ + __alignof__ (struct hostent_data));
+ tmp_buffer = (char *) (((uintptr_t) tmp_buffer
+ + __alignof__ (struct hostent_data)
+ - 1)
+ & ~(__alignof__ (struct hostent_data)
+ - 1));
+ goto again;
+ }
+ }
+ else
+ status = NSS_STATUS_SUCCESS;
+ out:
+ if (tmp_buffer_malloced)
+ free (tmp_buffer);
+ }
+
+ if (! keep_stream)
+ internal_endent ();
+ }
+
+ if (canonp && status == NSS_STATUS_SUCCESS)
+ *canonp = result->h_name;
+
+ __libc_lock_unlock (lock);
+
+ return status;
+}
+
+enum nss_status
+_nss_files_gethostbyname_r (const char *name, struct hostent *result,
+ char *buffer, size_t buflen, int *errnop,
+ int *herrnop)
+{
+ int af = ((_res.options & RES_USE_INET6) ? AF_INET6 : AF_INET);
+
+ return _nss_files_gethostbyname3_r (name, af, result, buffer, buflen,
+ errnop, herrnop, NULL, NULL);
+}
+
+enum nss_status
+_nss_files_gethostbyname2_r (const char *name, int af, struct hostent *result,
+ char *buffer, size_t buflen, int *errnop,
+ int *herrnop)
+{
+ return _nss_files_gethostbyname3_r (name, af, result, buffer, buflen,
+ errnop, herrnop, NULL, NULL);
+}
+
+enum nss_status
+_nss_files_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
+ char *buffer, size_t buflen, int *errnop,
+ int *herrnop, int32_t *ttlp)
+{
+ __libc_lock_lock (lock);
+
+ /* Reset file pointer to beginning or open file. */
+ enum nss_status status = internal_setent (keep_stream);
+
+ if (status == NSS_STATUS_SUCCESS)
+ {
+ /* Tell getent function that we have repositioned the file pointer. */
+ last_use = getby;
+
+ bool any = false;
+ bool got_canon = false;
+ while (1)
+ {
+ /* Align the buffer for the next record. */
+ uintptr_t pad = (-(uintptr_t) buffer
+ % __alignof__ (struct hostent_data));
+ buffer += pad;
+ buflen = buflen > pad ? buflen - pad : 0;
+
+ struct hostent result;
+ status = internal_getent (&result, buffer, buflen, errnop,
+ herrnop, AF_UNSPEC, 0);
+ if (status != NSS_STATUS_SUCCESS)
+ break;
+
+ int naliases = 0;
+ if (__strcasecmp (name, result.h_name) != 0)
+ {
+ for (; result.h_aliases[naliases] != NULL; ++naliases)
+ if (! __strcasecmp (name, result.h_aliases[naliases]))
+ break;
+ if (result.h_aliases[naliases] == NULL)
+ continue;
+
+ /* We know this alias exist. Count it. */
+ ++naliases;
+ }
+
+ /* Determine how much memory has been used so far. */
+ // XXX It is not necessary to preserve the aliases array
+ while (result.h_aliases[naliases] != NULL)
+ ++naliases;
+ char *bufferend = (char *) &result.h_aliases[naliases + 1];
+ assert (buflen >= bufferend - buffer);
+ buflen -= bufferend - buffer;
+ buffer = bufferend;
+
+ /* We found something. */
+ any = true;
+
+ /* Create the record the caller expects. There is only one
+ address. */
+ assert (result.h_addr_list[1] == NULL);
+ if (*pat == NULL)
+ {
+ uintptr_t pad = (-(uintptr_t) buffer
+ % __alignof__ (struct gaih_addrtuple));
+ buffer += pad;
+ buflen = buflen > pad ? buflen - pad : 0;
+
+ if (__builtin_expect (buflen < sizeof (struct gaih_addrtuple),
+ 0))
+ {
+ *errnop = ERANGE;
+ *herrnop = NETDB_INTERNAL;
+ status = NSS_STATUS_TRYAGAIN;
+ break;
+ }
+
+ *pat = (struct gaih_addrtuple *) buffer;
+ buffer += sizeof (struct gaih_addrtuple);
+ buflen -= sizeof (struct gaih_addrtuple);
+ }
+
+ (*pat)->next = NULL;
+ (*pat)->name = got_canon ? NULL : result.h_name;
+ got_canon = true;
+ (*pat)->family = result.h_addrtype;
+ memcpy ((*pat)->addr, result.h_addr_list[0], result.h_length);
+ (*pat)->scopeid = 0;
+
+ pat = &((*pat)->next);
+
+ /* If we only look for the first matching entry we are done. */
+ if ((_res_hconf.flags & HCONF_FLAG_MULTI) == 0)
+ break;
+ }
+
+ /* If we have to look for multiple records and found one, this
+ is a success. */
+ if (status == NSS_STATUS_NOTFOUND && any)
+ {
+ assert ((_res_hconf.flags & HCONF_FLAG_MULTI) != 0);
+ status = NSS_STATUS_SUCCESS;
+ }
+
+ if (! keep_stream)
+ internal_endent ();
+ }
+ else if (status == NSS_STATUS_TRYAGAIN)
+ {
+ *errnop = errno;
+ *herrnop = TRY_AGAIN;
+ }
+ else
+ {
+ *errnop = errno;
+ *herrnop = NO_DATA;
+ }
+
+ __libc_lock_unlock (lock);
+
+ return status;
+}
projects / thirdparty / glibc.git / blobdiff