Refuse to re-use keys

[overonion] / temp_file.c

#define _GNU_SOURCE

#include "temp_file.h"

#include <err.h>
#include <stdlib.h>
#include <stdio.h>
#include <sysexits.h>

void make_temporary_file(char** temp_filename, FILE** temp_file) {
  char* TMPDIR = getenv("TMPDIR");
  if (TMPDIR == NULL) {
    TMPDIR = "/tmp";
  }
  if (asprintf(temp_filename, "%s/reverse.XXXXXX", TMPDIR) == -1) {
    errx(EX_OSERR, "Could not assemble temporary filename");
  }
  int fd = mkstemp(*temp_filename);
  if (fd == -1) err(EX_IOERR, "Could not make a temporary file");
  *temp_file = fdopen(fd, "w");
  if (*temp_file == NULL) err(EX_IOERR, "Could not open temporary file");
}