ssldump/pcap/sys.c

/*-
 * SSLsplit - transparent SSL/TLS interception
 * https://www.roe.ch/SSLsplit
 *
 * Copyright (c) 2009-2019, Daniel Roethlisberger <daniel@roe.ch>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "sys.h"

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/un.h>
#include <sys/time.h>
#include <time.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netdb.h>
#include <fcntl.h>
#include <pwd.h>
#include <grp.h>
#include <fts.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>

/*
 * Determine address family of addr
 */
int sys_get_af(const char *addr) {
  if(strstr(addr, ":"))
    return AF_INET6;
  else if(!strpbrk(addr,
                   "abcdefghijklmnopqrstu"
                   "vwxyzABCDEFGHIJKLMNOP"
                   "QRSTUVWXYZ-"))
    return AF_INET;
  else
    return AF_UNSPEC;
}

static int sys_rand_seeded = 0;

static void sys_rand_seed(void) {
  struct timeval seed;

  if(gettimeofday(&seed, NULL) == -1) {
    srandom((unsigned)time(NULL));
  } else {
    srandom((unsigned)(seed.tv_sec ^ seed.tv_usec));
  }
  sys_rand_seeded = 1;
}

uint16_t sys_rand16(void) {
  if(unlikely(!sys_rand_seeded))
    sys_rand_seed();
  return random();
}

uint32_t sys_rand32(void) {
  if(unlikely(!sys_rand_seeded))
    sys_rand_seed();
  return random();
}

/* vim: set noet ft=c: */