Builds in termux on Android, but fails argument processing.

[bobpaul]

I think this might be because termux provides clang instead of gcc. I am using the patch in #3

~/Obfuscation-Tunnel $ ./tunnel -l tcp:127.0.0.1:12345 -r tcp:192.168.0.10:22
Failed to resolve host 192.168.0.10: Invalid value for ai_flags
Failed to parse remote endpoint.

~/Obfuscation-Tunnel $ gcc --version
clang version 19.1.1
Target: aarch64-unknown-linux-android24
Thread model: posix
InstalledDir: /data/data/com.termux/files/usr/bin

~/Obfuscation-Tunnel $ ./tunnel -r tcp:127.0.0.1:12345 -l tcp:192.168.0.10:22
Failed to resolve host 127.0.0.1: Invalid value for ai_flags
Failed to parse remote endpoint.

~/Obfuscation-Tunnel $

[bobpaul]

It's not due to clang; it builds fine with clang. It's because termux uses bionic libc and bionic's getaddrinfo implementation is more strict.

But even with either glibc and musl, setting ai_flags = AI_ALL is ignored (while on bionic, it's invalid):

$ man 3 getaddrinfo
... snip ...
       If hints.ai_flags specifies the AI_V4MAPPED flag, and hints.ai_family was specified as AF_INET6, and no match‐
       ing  IPv6  addresses could be found, then return IPv4-mapped IPv6 addresses in the list pointed to by res.  If
       both AI_V4MAPPED and AI_ALL are specified in hints.ai_flags, then return both IPv6 and  IPv4-mapped  IPv6  ad‐
       dresses in the list pointed to by res.  AI_ALL is ignored if AI_V4MAPPED is not also specified.

There's no AI_V4MAPPED used anywhere in the program, so setting =AI_ALL is the same as setting =0. Setting to =0 builds fine on termux without the need for glibc or creating a proot.