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ipv6: only probe once

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Move ipv6-functional-probe into a single function that is used from all
places that need to know.

Make the probe function store the result in a static variable so that
subsequent invokes just returns the previous result and won't have to
probe again.
This commit is contained in:
Daniel Stenberg 2011-03-23 11:10:55 +01:00
parent 9680df4807
commit 67eb679264
3 changed files with 43 additions and 44 deletions
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11
lib/hostip.h
View File

@ -7,7 +7,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -113,6 +113,15 @@ int Curl_resolv_timeout(struct connectdata *conn, const char *hostname,
int port, struct Curl_dns_entry **dnsentry,
long timeoutms);
#ifdef CURLRES_IPV6
/*
* Curl_ipv6works() returns TRUE if ipv6 seems to work.
*/
bool Curl_ipv6works(void);
#else
#define Curl_ipv6works() FALSE
#endif
/*
* Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
* been set and returns TRUE if they are OK.

53
lib/hostip6.c
View File

@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -108,20 +108,37 @@ int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
}
#endif /* defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO) */
/*
* Curl_ipv6works() returns TRUE if ipv6 seems to work.
*/
bool Curl_ipv6works(void)
{
/* the nature of most system is that IPv6 status doesn't come and go
during a program's lifetime so we only probe the first time and then we
have the info kept for fast re-use */
static int ipv6_works = -1;
if(-1 == ipv6_works) {
/* probe to see if we have a working IPv6 stack */
curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
if(s == CURL_SOCKET_BAD)
/* an ipv6 address was requested but we can't get/use one */
ipv6_works = 0;
else {
ipv6_works = 1;
sclose(s);
}
}
return (ipv6_works>0)?TRUE:FALSE;
}
/*
* Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
* been set and returns TRUE if they are OK.
*/
bool Curl_ipvalid(struct connectdata *conn)
{
if(conn->ip_version == CURL_IPRESOLVE_V6) {
/* see if we have an IPv6 stack */
curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
if(s == CURL_SOCKET_BAD)
/* an ipv6 address was requested and we can't get/use one */
return FALSE;
sclose(s);
}
if(conn->ip_version == CURL_IPRESOLVE_V6)
return Curl_ipv6works();
return TRUE;
}
@ -186,23 +203,9 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
break;
}
if (pf != PF_INET) {
/* see if we have an IPv6 stack */
curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
if(s == CURL_SOCKET_BAD) {
/* 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. */
if((pf != PF_INET) && !Curl_ipv6works())
/* 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.
*/
sclose(s);
}
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = pf;

21
lib/hostthre.c
View File

@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -530,23 +530,10 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
break;
}
if (pf != PF_INET) {
/* see if we have an IPv6 stack */
curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
if(s == CURL_SOCKET_BAD) {
/* 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. */
if((pf != PF_INET) && !Curl_ipv6works())
/* 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.
*/
sclose(s);
}
}
#endif /* !CURLRES_IPV4 */
memset(&hints, 0, sizeof(hints));