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authorDaniel Stenberg <daniel@haxx.se>2011-03-23 11:10:55 +0100
committerDaniel Stenberg <daniel@haxx.se>2011-03-23 11:10:55 +0100
commit67eb679264b9b6ebd1b123275ac729c8092fce10 (patch)
treebbd7dcc2da53336f8eba7a4a66277c6df0cdfeca /lib/hostip6.c
parent9680df4807be3a33640611a79d2e113335e3fc69 (diff)
downloadcurl-67eb679264b9b6ebd1b123275ac729c8092fce10.tar.gz
ipv6: only probe once
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.
Diffstat (limited to 'lib/hostip6.c')
-rw-r--r--lib/hostip6.c55
1 files changed, 29 insertions, 26 deletions
diff --git a/lib/hostip6.c b/lib/hostip6.c
index ca0280790..5c05dc97c 100644
--- a/lib/hostip6.c
+++ b/lib/hostip6.c
@@ -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
@@ -109,19 +109,36 @@ int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
#endif /* defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO) */
/*
- * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
- * been set and returns TRUE if they are OK.
+ * Curl_ipv6works() returns TRUE if ipv6 seems to work.
*/
-bool Curl_ipvalid(struct connectdata *conn)
+bool Curl_ipv6works(void)
{
- if(conn->ip_version == CURL_IPRESOLVE_V6) {
- /* see if we have an IPv6 stack */
+ /* 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 and we can't get/use one */
- return FALSE;
- sclose(s);
+ /* 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)
+ 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. */
-
- 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);
- }
- }
+ if((pf != PF_INET) && !Curl_ipv6works())
+ /* the stack seems to be a non-ipv6 one */
+ pf = PF_INET;
memset(&hints, 0, sizeof(hints));
hints.ai_family = pf;