#742 Failing to download IPV6 URLS with IPV4 mapped last 32 bits

[angshuman rudra]

operating system's name and version number : Windows XP SP2 - (IPv6 installed using netsh interface ipv6 install)

what version of curl you're using: 7.15

what URL you were working with: http://\[2001:1890:110b:15ce:250:56ff:254.187.40.177] This is an IPv4 mapped address corresponding to the v6 address:
http://\[2001:1890:110b:15ce:250:56ff:febb:28b1]

Details:
Using the curl library, we are facing some issues in downloading details from an IPv4 mapped IPv6 address.

[Daniel Stenberg]

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Please try a much more recent curl version as 7.15 is quite outdated. 7.18.1 is the most recent one that we believe works correctly in this aspect.

The, exactly in what way does it fail when you run what command? Can you please show us the source code for a small stand-alone program that repeats the problem?

[Dan Fandrich]

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Are you encountering by any chance KNOWN_BUG #30? http://curl.haxx.se/docs/knownbugs.html

[Daniel Stenberg]

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Please respond or this will be closed with no further action.

[angshuman rudra]

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The method Curl_getaddrinfo fails:
Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
char *hostname,
int port,
int *waitp)
{
struct addrinfo hints, *res;
int error;
char sbuf[NI_MAXSERV];
char *sbufptr = NULL;
char addrbuf[128];
curl_socket_t s;
int pf;
struct SessionHandle *data = conn->data;
int ai_flags;

*waitp=0; /* don't wait, we have the response now */

/* 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.
*/
sclose(s);

/*
* Check if a more limited name resolve has been requested.
*/
switch(data->set.ip_version) {
case CURL_IPRESOLVE_V4:
pf = PF_INET;
break;
case CURL_IPRESOLVE_V6:
pf = PF_INET6;
break;
default:
pf = PF_UNSPEC;
break;
}
}

if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
(1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
/* the given address is numerical only, prevent a reverse lookup */
ai_flags = AI_NUMERICHOST;
}
else
ai_flags = AI_CANONNAME;

memset(&hints, 0, sizeof(hints));
hints.ai_family = pf;

hints.ai_socktype = conn->socktype;

hints.ai_flags = ai_flags;
if(port) {
snprintf(sbuf, sizeof(sbuf), "%d", port);
sbufptr=sbuf;
}
error = getaddrinfo(hostname, sbufptr, &hints, &res);
if (error) {
infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
return NULL;
}

return res;
}

[Dan Fandrich]

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Is your libcurl using your system's inet_pton() function or curl's own Curl_inet_pton()? curl's should handle this address format fine.

[Dan Fandrich]

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Accessing the local server with the command: "curl -v -g 'http://[::ffff:127.0.0.1]/'" works fine for me on Linux with curl 7.18.1.

[SourceForge Robot]

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