Monkey-patching MathLM on Mac OS X so it does not crash when clients with 32-character (or longer) hostnames request a Mathematica license

.gitignore

*.o
*.dylib

Makefile

strcpy.dylib: strcpy.c
	gcc -Wall -o $@ -dynamiclib $<

run.sh

#!/bin/bash

sudo -u lmgrduser DYLD_FORCE_FLAT_NAMESPACE=1 DYLD_INSERT_LIBRARIES=strcpy.dylib /usr/local/Wolfram/MathLM/mathlm -foreground -pwfile /usr/local/Wolfram/MathLM/mathpass -timeout 3 -loglevel 4 -logfile /var/log/lmgrd/mathlm.log

strcpy.c

#include <stdio.h>
#include <string.h>


void *
__strcpy_chk (char* dest, char* src, size_t dstlen)
{
  size_t len = strlen (src);
  if (__builtin_expect (dstlen < len, 0))
    printf("THIS WOULD HAVE CRASHED: ");
  printf("Copying %s. Source: %lu bytes, Destination: %lu bytes\n", src, len, dstlen);
  
  if (18446744073709551615U == dstlen)
      return memcpy (dest, src, len + 1);

  return strncpy (dest, src, dstlen);
}