From a functional point of view, the main improvement is that GetIP() now always prioritizes IPv6 over IPv4.
The previous implementation always returned an IPv4 address, unless not available: in such case it failed.
This means that now connections to hostnames should be established via IPv6 if available.
From a programmer point of view, getting rid of the insane wrappers is enough to justify a complete rewrite.
As an extra, several unrelated unused global variables are removed.
Before this commit, the IP address reported by the NAT-T server was immediately discarded.
That's because the peer should be accessible via the IP address used to establish the TCP connection.
User "domosekai" (https://www.domosekai.com) pointed out that the NAT-T IP address should be taken into account.
In his case it's required due to his broadband carrier's NAT causing TCP and UDP to have different external IPs.
Co-authored-by: domosekai <54519668+domosekai@users.noreply.github.com>
To solve the problem that the escape condition of the loop that tries name resolution in UDP mode was reversed in the keep-alive function of the Internet connection, so the name resolution retry is set to 250 msec interval instead of the normal 60 second interval.
The PROTO structure is now used to identify the system as a whole, rather than a single protocol. It's stored and initialized in Server.
ProtoCompare(), ProtoAdd() and ProtoDetected() are renamed to make the difference between PROTO and PROTO_IMPL more clear.
ProtoGet() and ProtoNum() are removed because the related list can now be accessed directly by Server.
This commit adds a protocol interface to the server, its purpose is to manage TCP connections and the various third-party protocols.
More specifically, ProtoHandleConnection() takes care of exchanging the packets between the local and remote endpoint; the protocol implementation only has to parse them and act accordingly.
The interface knows which protocol is the connection for by calling IsPacketForMe(), a function implemented for each protocol.
- Hash() has been removed because it was ambiguous, Md5() and Sha0() are proper replacements.
- HMacMd5() and HMacSha1() now share a common implementation handled by the new Internal_HMac() function.
- NewMd() and MdProcess() now support plain hashing (without the key).
- NewMd(), SetMdKey() and MdProcess() now check the OpenSSL functions' return value and in case of failure a debug message is printed along with the error string, if available.
- SetMdKey()'s return value has been changed from void to bool, so that it's possible to know whether the function succeeded or not.
- MdProcess()' return value has been changed from void to UINT (unsigned int) and the function now returns the number of bytes written by HMAC_Final() or EVP_DigestFinal_ex().
[src/Cedar/Connection.c:1090] -> [src/Cedar/Connection.c:1086]:
(warning) Either the condition 's!=NULL' is redundant or there is possible null pointer dereference: s.
macros IS_SEND_TCP_SOCK expands into "s" dereferencing, so check for NULL should go before that macros
[src/Cedar/Protocol.c:2951] -> [src/Cedar/Protocol.c:2892]:
(warning) Either the condition 'policy!=NULL' is redundant or there is possible null pointer dereference: policy.
[src/Cedar/Protocol.c:2951] -> [src/Cedar/Protocol.c:2901]:
(warning) Either the condition 'policy!=NULL' is redundant or there is possible null pointer dereference: policy.
[src/Cedar/Protocol.c:3151] -> [src/Cedar/Protocol.c:3082]:
(warning) Either the condition 'policy!=NULL' is redundant or there is possible null pointer dereference: policy.
[src/Cedar/Protocol.c:3151] -> [src/Cedar/Protocol.c:3083]:
(warning) Either the condition 'policy!=NULL' is redundant or there is possible null pointer dereference: policy.
as we already have a check
if (policy == NULL)
{
// Use the default policy
policy = ClonePolicy(GetDefaultPolicy());
}
no need to compare policy with NULL anymore
[src/Cedar/Connection.c:1041] -> [src/Cedar/Connection.c:1043]: (warning) Either the condition 's!=0' is redundant or there is possible null pointer dereference: s.
