getpeername, getsockname, gethostname and getifaddrs update

[qianxichen233]

Description

This PR adds some comments and tests for getpeername_syscall, getsockname_syscall, gethostname_syscall and getifaddrs_syscall. A issue was specified in the test: when calling connect without binding to any address, an new address will be automatically assigned to the socket. But we failed to update the corresponding information in the sockhandle, causing the ip and port returned from getsockname_syscall are both 0.

Fixes # (issue)

1. Add fd range check at the beginning of getpeername_syscall and getsockname_syscall

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• Test A - ut_lind_net_getpeername_bad_input
• Test B - ut_lind_net_getpeername_inet
• Test C - ut_lind_net_getpeername_unix
• Test D - ut_lind_net_getpeername_udp
• Test E - ut_lind_net_getsockname_bad_input
• Test F - ut_lind_net_getsockname_empty
• Test G - ut_lind_net_getsockname_inet
• Test H - ut_lind_net_getsockname_unix
• Test I - ut_lind_net_gethostname
• Test J - ut_lind_net_getifaddrs

Checklist:

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been added to a pull request and/or merged in other modules (native-client, lind-glibc, lind-project)

[namanlalitnyu]

Just one minor comment.

[rupeshkoushik07]

LGTM!

[JustinCappos]

A few suggestions throughout...

[ve1nard]

lgtm!

[JustinCappos]

@qianxichen233 If this is ready for my review again, please ping me so I know. (And follow up on slack in a day or so, if I don't respond.)

[JustinCappos]

looks good now. Thanks for the fixes!