Open Radar

 
Summary:
As documented, SSLSetALPNProtocols should be available since macOS 10.13 (High Sierra). This is not the case, the Security Framework is missing the function even though the header contains it.

Steps to Reproduce:
Compile + link the attached program.

Expected Results:
The program should compile and link fine on macOS 10.13.

Actual Results:
Linking fails due to the missing symbol in the Security framework:

Undefined symbols for architecture x86_64:
  "_SSLSetALPNProtocols", referenced from:
      _main in main.o
ld: symbol(s) not found for architecture x86_64


Version/Build:
macOS High Sierra 10.13.1 Beta (17B25c)

Notes:
Dumping the Security framework symbols with nm clearly shows it is missing.
(The other ALPN functions are private API)

$ nm /System/Library/Frameworks/Security.framework/Versions/Current/Security | grep ALPN
000000000022c8b5 T _SSLGetALPNData
000000000022c880 T _SSLSetALPNData
000000000022c84b T _SSLSetALPNFunc

Duplicate of 33907676

Example program code:

#include <CoreFoundation/CoreFoundation.h>
#include <Security/Security.h>

int main(int argc, const char * argv[]) {
    CFMutableArrayRef alpnValues =
    CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks);
    
    SSLSetALPNProtocols((SSLContextRef)0x001, alpnValues);
    CFRelease(alpnValues);
    
    return 0;
}