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Avoid duplicate DNS requests if answer is longer than a implementation

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        [BZ #14307]
        * sysdeps/posix/getaddrinfo.c (gaih_inet): Increase the size of
        the temporary buffer used to invoke __gethostbyname2_r,
        __gethostbyaddr_r and gethostbyname4_r to make room for struct
        host_data / struct gaih_addrtuple.
        * resolv/nss_dns/dns-host.c (global scope): Move definition of
        implementation constants MAX_NR_ALIASES and MAX_NR_ADDRS to
        header file nss/nsswitch.h.
        * nss/nsswitch.h (global scope): Add definition of implementation
        constants MAX_NR_ALIASES and MAX_NR_ADDRS (moved from
        resolv/nss_dns/dns-host.c).
This commit is contained in:
Jeroen van Bemmel
2012-07-12 11:23:28 +05:30
committed by Siddhesh Poyarekar
parent a766fb45a3
commit 7b6e99be77
4 changed files with 26 additions and 9 deletions
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10
sysdeps/posix/getaddrinfo.c
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@ -568,7 +568,9 @@ gaih_inet (const char *name, const struct gaih_service *service,
IPv6 scope ids. */
if (req->ai_family == AF_INET)
{
size_t tmpbuflen = 512;
/* Allocate additional room for struct host_data. */
size_t tmpbuflen = (512 + MAX_NR_ALIASES * sizeof(char*)
+ 16 * sizeof(char));
assert (tmpbuf == NULL);
tmpbuf = alloca_account (tmpbuflen, alloca_used);
int rc;
@ -811,7 +813,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
old_res_options = _res.options;
_res.options &= ~RES_USE_INET6;
size_t tmpbuflen = 1024;
size_t tmpbuflen = 1024 + sizeof(struct gaih_addrtuple);
malloc_tmpbuf = !__libc_use_alloca (alloca_used + tmpbuflen);
assert (tmpbuf == NULL);
if (!malloc_tmpbuf)
@ -1113,7 +1115,9 @@ gaih_inet (const char *name, const struct gaih_service *service,
struct hostent *h = NULL;
int herrno;
struct hostent th;
size_t tmpbuf2len = 512;
/* Add room for struct host_data. */
size_t tmpbuf2len = (512 + (MAX_NR_ALIASES+MAX_NR_ADDRS+1)
* sizeof(char*) + 16 * sizeof(char));
do
{