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Use a robust check IP vs. host name check for resolveHost. Fixes #117.

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This commit is contained in:
Sönke Ludwig 2019-01-16 22:31:14 +01:00
parent 8edca75696
commit 28260bd612
1 changed files with 29 additions and 2 deletions
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31
source/vibe/core/net.d
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@ -39,8 +39,7 @@ NetworkAddress resolveHost(string host, ushort address_family, bool use_dns = tr
else import core.sys.posix.netinet.in_ : sockaddr_in, sockaddr_in6;
enforce(host.length > 0, "Host name must not be empty.");
// FIXME: this check needs to be more specific to not disallow valid DNS names
if (host[0] == ':' || host[0] >= '0' && host[0] <= '9') {
if (isMaybeIPAddress(host)) {
auto addr = parseAddress(host);
enforce(address_family == AddressFamily.UNSPEC || addr.addressFamily == address_family);
NetworkAddress ret;
@ -1124,3 +1123,31 @@ class ReadTimeoutException: Exception
super(message, file, line, next);
}
}
// check whether the given name is not a valid host name, but may instead
// be a valid IP address. This is used as a quick check to avoid
// unnecessary address parsing or DNS queries
private bool isMaybeIPAddress(in char[] name)
{
import std.algorithm.searching : all, canFind;
import std.ascii : isDigit;
// could be an IPv6 address, but ':' is invalid in host names
if (name.canFind(':')) return true;
// an IPv4 address is at least 7 characters (0.0.0.0)
if (name.length < 7) return false;
// no valid TLD consists of only digits
return name.canFind('.') && name.all!(ch => ch.isDigit || ch == '.');
}
unittest {
assert(isMaybeIPAddress("0.0.0.0"));
assert(isMaybeIPAddress("::1"));
assert(isMaybeIPAddress("aabb::1f"));
assert(!isMaybeIPAddress("example.com"));
assert(!isMaybeIPAddress("12.com"));
assert(!isMaybeIPAddress("1.1.1.t12"));
}