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Ignore rogue DNS servers reported by windows

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This commit is contained in:
Bert Belder 2011-10-20 14:53:26 -07:00
parent c0e5db2d49
commit cb474b24c1
1 changed files with 12 additions and 9 deletions
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21
src/ares/ares_init.c
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@ -696,17 +696,20 @@ static int get_iphlpapi_dns_info (char *ret_buf, size_t ret_size)
struct sockaddr_in6 *pIPv6Addr = ( struct sockaddr_in6 * ) pGenericAddr;
ares_inet_ntop( AF_INET6, &pIPv6Addr->sin6_addr, ret, ipv6_size - 1 ); /* -1 for comma */
/* Append a comma to the end, THEN NULL. Should be OK because we
already tested the size at the top of the if statement. */
stringlen = strlen( ret );
ret[ stringlen ] = ',';
ret[ stringlen + 1 ] = '\0';
ret += stringlen + 1;
left -= ret - ret_buf;
++count;
/* NB on Windows this also returns stuff in the fec0::/10 range,
seems to be hard-coded somehow. Do we need to ignore them? */
/* Windows apparently always reports some IPv6 DNS servers that
prefixed with fec0:0:0:ffff. These ususally do not point to
working DNS servers, so we ignore them. */
if (strncmp(ret, "fec0:0:0:ffff:", 14) != 0) {
/* Append a comma to the end, THEN NULL. Should be OK because we
already tested the size at the top of the if statement. */
ret[ stringlen ] = ',';
ret[ stringlen + 1 ] = '\0';
ret += stringlen + 1;
left -= ret - ret_buf;
++count;
}
}
}
}