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Jun-ichiro itojun Hagino <itojun@itojun.org>:

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Now first check if IPv6 is supported, then use PF_UNSPEC. If not, use PF_INET.
It'll solve both the "slow name lookup" problem on IPv4 and still work fine on
IPv6 hosts.

Bug report #530204 has more details:
http://sourceforge.net/tracker/?func=detail&atid=100976&aid=530204&group_id=976
This commit is contained in:
Daniel Stenberg 2002-03-15 09:54:30 +00:00
parent 3cd2673077
commit fb29529a52
1 changed files with 15 additions and 1 deletions
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16
lib/hostip.c
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@ -291,9 +291,23 @@ Curl_addrinfo *Curl_getaddrinfo(struct SessionHandle *data,
struct addrinfo hints, *res;
int error;
char sbuf[NI_MAXSERV];
int s, pf = PF_UNSPEC;
/* see if we have an IPv6 stack */
s = socket(PF_INET6, SOCK_DGRAM, 0);
if (s < 0)
/* Some non-IPv6 stacks have been found to make very slow name resolves
* when PF_UNSPEC is used, so thus we switch to a mere PF_INET lookup if
* the stack seems to be a non-ipv6 one. */
pf = PF_INET;
else
/* This seems to be an IPv6-capable stack, use PF_UNSPEC for the widest
* possible checks. And close the socket again.
*/
close(s);
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_family = pf;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_CANONNAME;
snprintf(sbuf, sizeof(sbuf), "%d", port);