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Preferred IP version sorts getaddrionf() results

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Gerhard Rieger 2023-11-05 13:59:14 +01:00
parent 2d282f5608
commit 277f0d755d
16 changed files with 331 additions and 146 deletions

22
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@ -75,14 +75,22 @@ Features:
Tests: TRY_ADDRS_4 TRY_ADDRS_4_6
Feature recommended by Anand Buddhdev.
configure option --with-default-ipv allows to specify at build time if
IPv4, IPv6, or none of these is the preferred default.
configure option --enable-default-ipv allows to specify at build time if
IPv4, IPv6, or none of these is the preferred default; this is related
to environment variables SOCAT_PREFERRED_RESOLVE_IP and
SOCAT_DEFAULT_LISTEN_IP, and to Socat option -4, -6.
Furthermore, mechanism of IPv4 vs.IPv6 selection has been reworked.
When no IP version is preferred by these mechanism, passive Socat
addresses (LISTEN, RECV, RECVFROM) default to IPv6 because it might
support both versions (but checkout option ipv6-v6only).
For client addresses, when one of these mechanisms applies and name
resolution gives addresses of both IP versions, the addresses of the
preferred versions are tried first.
Socat options -4 and -6 have been reworked.
Tests: TCP_ENV6 TCP_DASH6
New option ai-addrconfig disables name resolution to protocol families
that are not configured on the computer (e.g. IPv6)
New option ai-addrconfig sets or unsets the AI_ADDRCONFIG flag of the
resolver to prevent name resolution to address families that are not
available in the network configuration. Default value is 1 in case the
resolver does not get an address family hint.
Flag AI_PASSIVE is now automatically applied for LISTEN, RECV, and
RECVFROM type addresses, and with bind option. In addition to its