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getaddrinfo: Convert from extend_alloca to struct scratch_buffer
This commit is contained in:
Florian Weimer
parent
b7db760660
commit
cd065b6843
@ -1,3 +1,12 @@
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2016-05-12 Florian Weimer <fweimer@redhat.com>
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* sysdeps/posix/getaddrinfo.c (gaih_inet_serv): Add tmpbuf
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argument. Use scratch buffer instead of extend_alloca.
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(gethosts): Use scratch buffer instead of extend_alloca.
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(gaih_inet): Add tmpbuf argument. Use scratch buffer instead of
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extend_alloca.
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(getaddrinfo): Allocate scratch buffer and pass it to gaih_inet.
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2016-05-11 Joseph Myers <joseph@codesourcery.com>
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[BZ #20055]
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@ -1,3 +1,21 @@
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/* Host and service name lookups using Name Service Switch modules.
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Copyright (C) 1996-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* The Inner Net License, Version 2.00
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The author(s) grant permission for redistribution and use in source and
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@ -63,6 +81,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <nscd/nscd-client.h>
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#include <nscd/nscd_proto.h>
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#include <resolv/res_hconf.h>
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#include <scratch_buffer.h>
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#ifdef HAVE_LIBIDN
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extern int __idna_to_ascii_lz (const char *input, char **output, int flags);
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@ -135,24 +154,24 @@ static const struct addrinfo default_hints =
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static int
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gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp,
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const struct addrinfo *req, struct gaih_servtuple *st)
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const struct addrinfo *req, struct gaih_servtuple *st,
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struct scratch_buffer *tmpbuf)
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{
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struct servent *s;
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size_t tmpbuflen = 1024;
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struct servent ts;
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char *tmpbuf;
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int r;
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do
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{
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tmpbuf = __alloca (tmpbuflen);
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r = __getservbyname_r (servicename, tp->name, &ts, tmpbuf, tmpbuflen,
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&s);
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r = __getservbyname_r (servicename, tp->name, &ts,
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tmpbuf->data, tmpbuf->length, &s);
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if (r != 0 || s == NULL)
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{
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if (r == ERANGE)
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tmpbuflen *= 2;
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{
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if (!scratch_buffer_grow (tmpbuf))
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return -EAI_MEMORY;
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}
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else
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return -EAI_SERVICE;
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}
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@ -227,26 +246,15 @@ convert_hostent_to_gaih_addrtuple (const struct addrinfo *req,
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no_data = 0; \
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while (1) { \
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rc = 0; \
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status = DL_CALL_FCT (fct, (name, _family, &th, tmpbuf, tmpbuflen, \
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status = DL_CALL_FCT (fct, (name, _family, &th, \
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tmpbuf->data, tmpbuf->length, \
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&rc, &herrno, NULL, &localcanon)); \
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if (rc != ERANGE || herrno != NETDB_INTERNAL) \
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break; \
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if (!malloc_tmpbuf && __libc_use_alloca (alloca_used + 2 * tmpbuflen)) \
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tmpbuf = extend_alloca_account (tmpbuf, tmpbuflen, 2 * tmpbuflen, \
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alloca_used); \
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else \
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if (!scratch_buffer_grow (tmpbuf)) \
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{ \
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char *newp = realloc (malloc_tmpbuf ? tmpbuf : NULL, \
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2 * tmpbuflen); \
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if (newp == NULL) \
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{ \
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_res.options |= old_res_options & RES_USE_INET6; \
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result = -EAI_MEMORY; \
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goto free_and_return; \
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} \
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tmpbuf = newp; \
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malloc_tmpbuf = true; \
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tmpbuflen = 2 * tmpbuflen; \
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result = -EAI_MEMORY; \
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goto free_and_return; \
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} \
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} \
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if (status == NSS_STATUS_SUCCESS && rc == 0) \
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@ -308,7 +316,7 @@ extern service_user *__nss_hosts_database attribute_hidden;
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static int
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gaih_inet (const char *name, const struct gaih_service *service,
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const struct addrinfo *req, struct addrinfo **pai,
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unsigned int *naddrs)
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unsigned int *naddrs, struct scratch_buffer *tmpbuf)
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{
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const struct gaih_typeproto *tp = gaih_inet_typeproto;
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struct gaih_servtuple *st = (struct gaih_servtuple *) &nullserv;
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@ -317,7 +325,10 @@ gaih_inet (const char *name, const struct gaih_service *service,
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bool got_ipv6 = false;
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const char *canon = NULL;
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const char *orig_name = name;
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size_t alloca_used = 0;
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/* Reserve stack memory for the scratch buffer in the getaddrinfo
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function. */
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size_t alloca_used = sizeof (struct scratch_buffer);
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if (req->ai_protocol || req->ai_socktype)
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{
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@ -352,7 +363,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
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st = (struct gaih_servtuple *)
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alloca_account (sizeof (struct gaih_servtuple), alloca_used);
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if ((rc = gaih_inet_serv (service->name, tp, req, st)))
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if ((rc = gaih_inet_serv (service->name, tp, req, st, tmpbuf)))
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return rc;
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}
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else
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@ -377,7 +388,8 @@ gaih_inet (const char *name, const struct gaih_service *service,
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alloca_account (sizeof (struct gaih_servtuple),
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alloca_used);
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if ((rc = gaih_inet_serv (service->name, tp, req, newp)))
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if ((rc = gaih_inet_serv (service->name,
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tp, req, newp, tmpbuf)))
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{
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if (rc)
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continue;
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@ -438,9 +450,8 @@ gaih_inet (const char *name, const struct gaih_service *service,
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struct gaih_addrtuple *addrmem = NULL;
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bool malloc_canonbuf = false;
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char *canonbuf = NULL;
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bool malloc_tmpbuf = false;
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char *tmpbuf = NULL;
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int result = 0;
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if (name != NULL)
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{
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at = alloca_account (sizeof (struct gaih_addrtuple), alloca_used);
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@ -608,11 +619,6 @@ gaih_inet (const char *name, const struct gaih_service *service,
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if (req->ai_family == AF_INET
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&& (req->ai_flags & AI_CANONNAME) == 0)
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{
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/* Allocate additional room for struct host_data. */
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size_t tmpbuflen = (512 + MAX_NR_ALIASES * sizeof(char*)
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+ 16 * sizeof(char));
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assert (tmpbuf == NULL);
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tmpbuf = alloca_account (tmpbuflen, alloca_used);
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int rc;
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struct hostent th;
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struct hostent *h;
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@ -620,28 +626,15 @@ gaih_inet (const char *name, const struct gaih_service *service,
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while (1)
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{
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rc = __gethostbyname2_r (name, AF_INET, &th, tmpbuf,
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tmpbuflen, &h, &herrno);
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rc = __gethostbyname2_r (name, AF_INET, &th,
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tmpbuf->data, tmpbuf->length,
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&h, &herrno);
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if (rc != ERANGE || herrno != NETDB_INTERNAL)
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break;
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if (!malloc_tmpbuf
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&& __libc_use_alloca (alloca_used + 2 * tmpbuflen))
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tmpbuf = extend_alloca_account (tmpbuf, tmpbuflen,
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2 * tmpbuflen,
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alloca_used);
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else
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if (!scratch_buffer_grow (tmpbuf))
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{
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char *newp = realloc (malloc_tmpbuf ? tmpbuf : NULL,
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2 * tmpbuflen);
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if (newp == NULL)
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{
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result = -EAI_MEMORY;
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goto free_and_return;
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}
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tmpbuf = newp;
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malloc_tmpbuf = true;
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tmpbuflen = 2 * tmpbuflen;
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result = -EAI_MEMORY;
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goto free_and_return;
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}
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}
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@ -835,22 +828,6 @@ gaih_inet (const char *name, const struct gaih_service *service,
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old_res_options = _res.options;
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_res.options &= ~RES_USE_INET6;
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size_t tmpbuflen = 1024 + sizeof(struct gaih_addrtuple);
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malloc_tmpbuf = !__libc_use_alloca (alloca_used + tmpbuflen);
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assert (tmpbuf == NULL);
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if (!malloc_tmpbuf)
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tmpbuf = alloca_account (tmpbuflen, alloca_used);
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else
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{
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tmpbuf = malloc (tmpbuflen);
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if (tmpbuf == NULL)
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{
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_res.options |= old_res_options & RES_USE_INET6;
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result = -EAI_MEMORY;
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goto free_and_return;
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}
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}
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while (!no_more)
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{
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no_data = 0;
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@ -868,8 +845,9 @@ gaih_inet (const char *name, const struct gaih_service *service,
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while (1)
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{
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rc = 0;
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status = DL_CALL_FCT (fct4, (name, pat, tmpbuf,
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tmpbuflen, &rc, &herrno,
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status = DL_CALL_FCT (fct4, (name, pat,
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tmpbuf->data, tmpbuf->length,
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&rc, &herrno,
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NULL));
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if (status == NSS_STATUS_SUCCESS)
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break;
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@ -883,24 +861,11 @@ gaih_inet (const char *name, const struct gaih_service *service,
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break;
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}
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if (!malloc_tmpbuf
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&& __libc_use_alloca (alloca_used + 2 * tmpbuflen))
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tmpbuf = extend_alloca_account (tmpbuf, tmpbuflen,
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2 * tmpbuflen,
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alloca_used);
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else
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if (!scratch_buffer_grow (tmpbuf))
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{
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char *newp = realloc (malloc_tmpbuf ? tmpbuf : NULL,
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2 * tmpbuflen);
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if (newp == NULL)
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{
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_res.options |= old_res_options & RES_USE_INET6;
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result = -EAI_MEMORY;
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goto free_and_return;
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}
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tmpbuf = newp;
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malloc_tmpbuf = true;
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tmpbuflen = 2 * tmpbuflen;
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_res.options |= old_res_options & RES_USE_INET6;
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result = -EAI_MEMORY;
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goto free_and_return;
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}
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}
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@ -1287,8 +1252,6 @@ gaih_inet (const char *name, const struct gaih_service *service,
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free (addrmem);
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if (malloc_canonbuf)
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free (canonbuf);
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if (malloc_tmpbuf)
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free (tmpbuf);
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return result;
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}
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@ -2423,7 +2386,11 @@ getaddrinfo (const char *name, const char *service,
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if (hints->ai_family == AF_UNSPEC || hints->ai_family == AF_INET
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|| hints->ai_family == AF_INET6)
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{
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last_i = gaih_inet (name, pservice, hints, end, &naddrs);
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struct scratch_buffer tmpbuf;
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scratch_buffer_init (&tmpbuf);
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last_i = gaih_inet (name, pservice, hints, end, &naddrs, &tmpbuf);
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scratch_buffer_free (&tmpbuf);
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if (last_i != 0)
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{
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freeaddrinfo (p);
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