Hello,

This line of code may cause difficult-to-trace side effects:

lib/formdata.c:1746, function Curl_FormBoundary()
  srand((unsigned int)time(NULL)+randomizer++); /* seed */

Note that srand() changes the rand() sequence globally for the whole
application. Usually it is called only once when the program
starts up - at least this is the recommended way to use it.

The problem with this line of code is that it:
1. Called repeatedly. In fact, such usage makes the sequence produced
   by rand() *less* random.
2. It changes the global state without the main program's knowledge.
   What is worse, it tends to re-initialize rand() with the same
   initial value when called repeatedly at 1-second intervals.
3. It does not work well with forked applications.
After the application forks some children, all of them will have the
same 'randomizer' variable. Consequently, if two children call
Curl_FormBoundary() within one second, the boundaries will be the
same.

I suggest to remove the call to srand() altogether, and give the
application developer a chance to seed the random number generator.

-- 
Best regards,
 Tetetest                          mailto:tetetest_at_rambler.ru