IPv6 Kerberos server address handling in SASL2 GSSAPI plugin

[Xu, Qiang (FXSGSC)]

> -----Original Message-----
> From: Alexey Melnikov [mailto:alexey.melnikov at isode.com] 
> Sent: Thursday, August 06, 2009 7:08 PM
> To: Xu, Qiang (FXSGSC)
> Cc: cyrus-sasl at lists.andrew.cmu.edu
> Subject: Re: IPv6 Kerberos server address handling in SASL2 
> GSSAPI plugin
> 
> Neither. I meant _sasl_ipfromstring() called from sasl_setprop() [in 
> lib/common.c].

Just had quick look at the func:
=======================================================
/* This code might be useful in the future, but it isn't now, so.... */
#if 0
int _sasl_iptostring(const struct sockaddr *addr, socklen_t addrlen,
		     char *out, unsigned outlen) {
    char hbuf[NI_MAXHOST], pbuf[NI_MAXSERV];
    int niflags;

    if(!addr || !out) return SASL_BADPARAM;

    niflags = (NI_NUMERICHOST | NI_NUMERICSERV);
#ifdef NI_WITHSCOPEID
    if (addr->sa_family == AF_INET6)
	niflags |= NI_WITHSCOPEID;
#endif
    if (getnameinfo(addr, addrlen, hbuf, sizeof(hbuf), pbuf, sizeof(pbuf),
		    niflags) != 0)
	return SASL_BADPARAM;

    if(outlen < strlen(hbuf) + strlen(pbuf) + 2)
	return SASL_BUFOVER;

    snprintf(out, outlen, "%s;%s", hbuf, pbuf);

    return SASL_OK;
}
#endif

int _sasl_ipfromstring(const char *addr,
		       struct sockaddr *out, socklen_t outlen) 
{
    int i, j;
    struct addrinfo hints, *ai = NULL;
    char hbuf[NI_MAXHOST];
    
    /* A NULL out pointer just implies we don't do a copy, just verify it */

    if(!addr) return SASL_BADPARAM;

    /* Parse the address */
    for (i = 0; addr[i] != '\0' && addr[i] != ';'; i++) {
	if (i >= NI_MAXHOST)
	    return SASL_BADPARAM;
	hbuf[i] = addr[i];
    }
    hbuf[i] = '\0';

    if (addr[i] == ';')
	i++;
    /* XXX: Do we need this check? */
    for (j = i; addr[j] != '\0'; j++)
	if (!isdigit((int)(addr[j])))
	    return SASL_BADPARAM;

    memset(&hints, 0, sizeof(hints));
    hints.ai_family = PF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
    if (getaddrinfo(hbuf, &addr[i], &hints, &ai) != 0)
	return SASL_BADPARAM;

    if (out) {
	if (outlen < (socklen_t)ai->ai_addrlen) {
	    freeaddrinfo(ai);
	    return SASL_BUFOVER;
	}
	memcpy(out, ai->ai_addr, ai->ai_addrlen);
    }

    freeaddrinfo(ai);

    return SASL_OK;
}
=======================================================
So in my eyes, _sasl_ipfromstring is just a wrapper of getaddrinfo(). But I am not sure if this function is involved in locating the Kerberos server with an IPv6 address?

Thanks,
Xu Qiang