curl: missing Secure Transport (darwinssl) support

[macports-trac-phil@…]

Per ​http://daniel.haxx.se/blog/2012/06/28/darwin-native-ssl-for-curl/ the curl project has supported using Apple's native Secure Transport facility for SSL since 7.27.0; we're currently on 7.29.0.

With Secure Transport, the system keychain is used for trust anchors; this is sufficient benefit that I think it worth supporting a third SSL-related build variant.

"This ninth supported SSL library is now called ‘darwinssl’ in the curl code base." -- on this basis, I called the variant in the attached patch "darwinssl"; this is my first upstream contribution for MacPorts and I'm not aware of how to constrain this option to be available only on darwin, given that the port declares it is also appropriate for FreeBSD. I'm using curl built this way now.

% port installed curl
The following ports are currently installed:
  curl @7.29.0_0+ares+darwinssl (active)
  curl @7.29.0_0+ares+sftp_scp+ssl
% curl --version
curl 7.29.0 (x86_64-apple-darwin12.2.1) libcurl/7.29.0 SecureTransport zlib/1.2.7 c-ares/1.7.5 libidn/1.26
Protocols: dict file ftp ftps gopher http https imap imaps pop3 pop3s rtsp smtp smtps telnet tftp 
Features: AsynchDNS IDN IPv6 Largefile NTLM NTLM_WB SSL libz 

I can retrieve content from a site using a cert for a local CA that is installed in the keychains.

[macports-trac-phil@…]

patch for curl Portfile to add darwinssl

[larryv (Lawrence Velázquez)]

Thanks for the ticket. In the future, please Cc relevant port maintainers and use WikiFormatting.