![Gerald Combs](/assets/img/avatar_default.png)
can block forever) for our seed. This fixes a problem with our new Linux build slave, which is running Linux 2.6 as a VM guest, and which was timing out waiting for entropy. Add a comment about using CryptGenRandom on Windows. svn path=/trunk/; revision=31456
733 lines
15 KiB
C
733 lines
15 KiB
C
/*
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* randpkt.c
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* ---------
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* Creates random packet traces. Useful for debugging sniffers by testing
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* assumptions about the veracity of the data found in the packet.
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*
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* $Id$
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*
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* Copyright (C) 1999 by Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_GETOPT_H
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#include <getopt.h>
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#else
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#include "wsgetopt.h"
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#include <time.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include "wiretap/wtap.h"
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#define array_length(x) (sizeof x / sizeof x[0])
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/* Types of produceable packets */
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enum {
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PKT_ARP,
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PKT_BGP,
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PKT_BVLC,
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PKT_DNS,
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PKT_ETHERNET,
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PKT_FDDI,
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PKT_GIOP,
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PKT_ICMP,
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PKT_IP,
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PKT_LLC,
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PKT_M2M,
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PKT_MEGACO,
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PKT_NBNS,
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PKT_NCP2222,
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PKT_SCTP,
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PKT_SYSLOG,
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PKT_TCP,
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PKT_TDS,
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PKT_TR,
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PKT_UDP,
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PKT_USB,
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PKT_USB_LINUX
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};
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typedef struct {
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const char *abbrev;
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const char *longname;
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int produceable_type;
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int sample_wtap_encap;
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guint8 *sample_buffer;
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int sample_length;
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guint8 *pseudo_buffer;
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int pseudo_length;
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} pkt_example;
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/* Ethernet, indicating ARP */
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guint8 pkt_arp[] = {
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0x00, 0x00,
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0x32, 0x25, 0x0f, 0xff,
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0x08, 0x06
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};
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/* Ethernet+IP+UDP, indicating DNS */
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guint8 pkt_dns[] = {
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01,
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0x08, 0x00,
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0x45, 0x00, 0x00, 0x3c,
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0xc5, 0x9e, 0x40, 0x00,
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0xff, 0x11, 0xd7, 0xe0,
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0xd0, 0x15, 0x02, 0xb8,
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0x0a, 0x01, 0x01, 0x63,
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0x05, 0xe8, 0x00, 0x35,
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0xff, 0xff, 0x2a, 0xb9,
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0x30
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};
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/* Ethernet+IP, indicating ICMP */
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guint8 pkt_icmp[] = {
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01,
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0x08, 0x00,
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0x45, 0x00, 0x00, 0x54,
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0x8f, 0xb3, 0x40, 0x00,
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0xfd, 0x01, 0x8a, 0x99,
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0xcc, 0xfc, 0x66, 0x0b,
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0xce, 0x41, 0x62, 0x12
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};
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/* Ethernet, indicating IP */
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guint8 pkt_ip[] = {
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01,
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0x08, 0x00
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};
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/* TR, indicating LLC */
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guint8 pkt_llc[] = {
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0x10, 0x40, 0x68, 0x00,
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0x19, 0x69, 0x95, 0x8b,
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0x00, 0x01, 0xfa, 0x68,
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0xc4, 0x67
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};
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/* Ethernet, indicating WiMAX M2M */
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guint8 pkt_m2m[] = {
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0x00, 0x00,
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0x32, 0x25, 0x0f, 0xff,
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0x08, 0xf0
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};
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/* Ethernet+IP+UDP, indicating NBNS */
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guint8 pkt_nbns[] = {
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01,
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0x08, 0x00,
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0x45, 0x00, 0x00, 0x3c,
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0xc5, 0x9e, 0x40, 0x00,
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0xff, 0x11, 0xd7, 0xe0,
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0xd0, 0x15, 0x02, 0xb8,
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0x0a, 0x01, 0x01, 0x63,
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0x00, 0x89, 0x00, 0x89,
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0x00, 0x00, 0x2a, 0xb9,
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0x30
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};
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/* Ethernet+IP+UDP, indicating syslog */
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guint8 pkt_syslog[] = {
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01,
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0x08, 0x00,
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0x45, 0x00, 0x00, 0x64,
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0x20, 0x48, 0x00, 0x00,
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0xfc, 0x11, 0xf8, 0x03,
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0xd0, 0x15, 0x02, 0xb8,
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0x0a, 0x01, 0x01, 0x63,
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0x05, 0xe8, 0x02, 0x02,
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0x00, 0x50, 0x51, 0xe1,
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0x3c
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};
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/* TR+LLC+IP, indicating TCP */
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guint8 pkt_tcp[] = {
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0x10, 0x40, 0x68, 0x00,
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0x19, 0x69, 0x95, 0x8b,
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0x00, 0x01, 0xfa, 0x68,
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0xc4, 0x67,
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0xaa, 0xaa, 0x03, 0x00,
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0x00, 0x00, 0x08, 0x00,
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0x45, 0x00, 0x00, 0x28,
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0x0b, 0x0b, 0x40, 0x00,
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0x20, 0x06, 0x85, 0x37,
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0xc0, 0xa8, 0x27, 0x01,
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0xc0, 0xa8, 0x22, 0x3c
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};
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/* Ethernet+IP, indicating UDP */
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guint8 pkt_udp[] = {
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01,
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0x08, 0x00,
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0x45, 0x00, 0x00, 0x3c,
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0xc5, 0x9e, 0x40, 0x00,
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0xff, 0x11, 0xd7, 0xe0,
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0xd0, 0x15, 0x02, 0xb8,
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0x0a, 0x01, 0x01, 0x63
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};
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/* Ethernet+IP+UDP, indicating BVLC */
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guint8 pkt_bvlc[] = {
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01,
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0x08, 0x00,
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0x45, 0x00, 0x00, 0x3c,
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0xc5, 0x9e, 0x40, 0x00,
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0xff, 0x11, 0x01, 0xaa,
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0xc1, 0xff, 0x19, 0x1e,
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0xc1, 0xff, 0x19, 0xff,
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0xba, 0xc0, 0xba, 0xc0,
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0x00, 0xff, 0x2d, 0x5e,
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0x81
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};
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/* TR+LLC+IPX, indicating NCP, with NCP Type == 0x2222 */
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guint8 pkt_ncp2222[] = {
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0x10, 0x40, 0x00, 0x00,
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0xf6, 0x7c, 0x9b, 0x70,
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0x68, 0x00, 0x19, 0x69,
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0x95, 0x8b, 0xe0, 0xe0,
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0x03, 0xff, 0xff, 0x00,
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0x25, 0x02, 0x11, 0x00,
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0x00, 0x74, 0x14, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x01, 0x04, 0x51, 0x00,
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0x00, 0x00, 0x04, 0x00,
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0x02, 0x16, 0x19, 0x7a,
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0x84, 0x40, 0x01, 0x22,
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0x22
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};
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/* Ethernet+IP+TCP, indicating GIOP */
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guint8 pkt_giop[] = {
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01,
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0x08, 0x00,
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0x45, 0x00, 0x00, 0xa6,
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0x00, 0x2f, 0x40, 0x00,
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0x40, 0x06, 0x3c, 0x21,
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0x7f, 0x00, 0x00, 0x01,
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0x7f, 0x00, 0x00, 0x01,
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0x30, 0x39, 0x04, 0x05,
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0xac, 0x02, 0x1e, 0x69,
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0xab, 0x74, 0xab, 0x64,
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0x80, 0x18, 0x79, 0x60,
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0xc4, 0xb8, 0x00, 0x00,
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0x01, 0x01, 0x08, 0x0a,
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0x00, 0x00, 0x48, 0xf5,
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0x00, 0x00, 0x48, 0xf5,
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0x47, 0x49, 0x4f, 0x50,
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0x01, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x30,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x01,
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0x01
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};
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/* Ethernet+IP+TCP, indicating BGP */
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guint8 pkt_bgp[] = {
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01,
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0x08, 0x00,
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0x45, 0x00, 0x00, 0xa6,
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0x00, 0x2f, 0x40, 0x00,
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0x40, 0x06, 0x3c, 0x21,
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0x7f, 0x00, 0x00, 0x01,
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0x7f, 0x00, 0x00, 0x01,
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0x30, 0x39, 0x00, 0xb3,
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0xac, 0x02, 0x1e, 0x69,
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0xab, 0x74, 0xab, 0x64,
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0x80, 0x18, 0x79, 0x60,
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0xc4, 0xb8, 0x00, 0x00,
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0x01, 0x01, 0x08, 0x0a,
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0x00, 0x00, 0x48, 0xf5,
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0x00, 0x00, 0x48, 0xf5,
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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};
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/* Ethernet+IP+TCP, indicating TDS NetLib */
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guint8 pkt_tds[] = {
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0x00, 0x50, 0x8b, 0x0d,
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0x7a, 0xed, 0x00, 0x08,
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0xa3, 0x98, 0x39, 0x81,
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0x08, 0x00,
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0x45, 0x00, 0x03, 0x8d,
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0x90, 0xd4, 0x40, 0x00,
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0x7c, 0x06, 0xc3, 0x1b,
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0xac, 0x14, 0x02, 0x22,
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0x0a, 0xc2, 0xee, 0x82,
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0x05, 0x99, 0x08, 0xf8,
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0xff, 0x4e, 0x85, 0x46,
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0xa2, 0xb4, 0x42, 0xaa,
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0x50, 0x18, 0x3c, 0x28,
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0x0f, 0xda, 0x00, 0x00,
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};
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/* Ethernet+IP, indicating SCTP */
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guint8 pkt_sctp[] = {
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0x00, 0xa0, 0x80, 0x00,
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0x5e, 0x46, 0x08, 0x00,
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0x03, 0x4a, 0x00, 0x35,
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0x08, 0x00,
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0x45, 0x00, 0x00, 0x7c,
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0x14, 0x1c, 0x00, 0x00,
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0x3b, 0x84, 0x4a, 0x54,
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0x0a, 0x1c, 0x06, 0x2b,
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0x0a, 0x1c, 0x06, 0x2c,
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};
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/* Ethernet+IP+SCTP, indicating MEGACO */
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guint8 pkt_megaco[] = {
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0x00, 0xa0, 0x80, 0x00,
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0x5e, 0x46, 0x08, 0x00,
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0x03, 0x4a, 0x00, 0x35,
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0x08, 0x00,
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0x45, 0x00, 0x00, 0x7c,
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0x14, 0x1c, 0x00, 0x00,
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0x3b, 0x84, 0x4a, 0x54,
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0x0a, 0x1c, 0x06, 0x2b,
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0x0a, 0x1c, 0x06, 0x2c,
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0x40, 0x00, 0x0b, 0x80,
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0x00, 0x01, 0x6f, 0x0a,
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0x6d, 0xb0, 0x18, 0x82,
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0x00, 0x03, 0x00, 0x5b,
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0x28, 0x02, 0x43, 0x45,
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0x00, 0x00, 0xa0, 0xbd,
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0x00, 0x00, 0x00, 0x07,
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};
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|
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/* This little data table drives the whole program */
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pkt_example examples[] = {
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{ "arp", "Address Resolution Protocol",
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PKT_ARP, WTAP_ENCAP_ETHERNET,
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pkt_arp, array_length(pkt_arp),
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NULL, 0 },
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{ "bgp", "Border Gateway Protocol",
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PKT_BGP, WTAP_ENCAP_ETHERNET,
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pkt_bgp, array_length(pkt_bgp),
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NULL, 0 },
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{ "bvlc", "BACnet Virtual Link Control",
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PKT_BVLC, WTAP_ENCAP_ETHERNET,
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pkt_bvlc, array_length(pkt_bvlc),
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NULL, 0 },
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{ "dns", "Domain Name Service",
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PKT_DNS, WTAP_ENCAP_ETHERNET,
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pkt_dns, array_length(pkt_dns),
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NULL, 0 },
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{ "eth", "Ethernet",
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PKT_ETHERNET, WTAP_ENCAP_ETHERNET,
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NULL, 0,
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NULL, 0 },
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{ "fddi", "Fiber Distributed Data Interface",
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PKT_FDDI, WTAP_ENCAP_FDDI,
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NULL, 0,
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NULL, 0 },
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|
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{ "giop", "General Inter-ORB Protocol",
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PKT_GIOP, WTAP_ENCAP_ETHERNET,
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pkt_giop, array_length(pkt_giop),
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NULL, 0 },
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|
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{ "icmp", "Internet Control Message Protocol",
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PKT_ICMP, WTAP_ENCAP_ETHERNET,
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pkt_icmp, array_length(pkt_icmp),
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NULL, 0 },
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|
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{ "ip", "Internet Protocol",
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PKT_IP, WTAP_ENCAP_ETHERNET,
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pkt_ip, array_length(pkt_ip),
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NULL, 0 },
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|
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{ "llc", "Logical Link Control",
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PKT_LLC, WTAP_ENCAP_TOKEN_RING,
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|
pkt_llc, array_length(pkt_llc),
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|
NULL, 0 },
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|
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|
{ "m2m", "WiMAX M2M Encapsulation Protocol",
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|
PKT_M2M, WTAP_ENCAP_ETHERNET,
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pkt_m2m, array_length(pkt_m2m),
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|
NULL, 0 },
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{ "megaco", "MEGACO",
|
|
PKT_MEGACO, WTAP_ENCAP_ETHERNET,
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pkt_megaco, array_length(pkt_megaco),
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NULL, 0 },
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{ "nbns", "NetBIOS-over-TCP Name Service",
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PKT_NBNS, WTAP_ENCAP_ETHERNET,
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pkt_nbns, array_length(pkt_nbns),
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NULL, 0 },
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|
|
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{ "ncp2222", "NetWare Core Protocol",
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|
PKT_NCP2222, WTAP_ENCAP_TOKEN_RING,
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|
pkt_ncp2222, array_length(pkt_ncp2222),
|
|
NULL, 0 },
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|
|
{ "sctp", "Stream Control Transmission Protocol",
|
|
PKT_SCTP, WTAP_ENCAP_ETHERNET,
|
|
pkt_sctp, array_length(pkt_sctp),
|
|
NULL, 0 },
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|
|
{ "syslog", "Syslog message",
|
|
PKT_SYSLOG, WTAP_ENCAP_ETHERNET,
|
|
pkt_syslog, array_length(pkt_syslog),
|
|
NULL, 0 },
|
|
|
|
{ "tds", "TDS NetLib",
|
|
PKT_TDS, WTAP_ENCAP_ETHERNET,
|
|
pkt_tds, array_length(pkt_tds),
|
|
NULL, 0 },
|
|
|
|
{ "tcp", "Transmission Control Protocol",
|
|
PKT_TCP, WTAP_ENCAP_TOKEN_RING,
|
|
pkt_tcp, array_length(pkt_tcp),
|
|
NULL, 0 },
|
|
|
|
{ "tr", "Token-Ring",
|
|
PKT_TR, WTAP_ENCAP_TOKEN_RING,
|
|
NULL, 0,
|
|
NULL, 0 },
|
|
|
|
{ "udp", "User Datagram Protocol",
|
|
PKT_UDP, WTAP_ENCAP_ETHERNET,
|
|
pkt_udp, array_length(pkt_udp),
|
|
NULL, 0 },
|
|
|
|
{ "usb", "Universal Serial Bus",
|
|
PKT_USB, WTAP_ENCAP_USB,
|
|
NULL, 0,
|
|
NULL, 0 },
|
|
|
|
{ "usb-linux", "Universal Serial Bus with Linux specific header",
|
|
PKT_USB_LINUX, WTAP_ENCAP_USB_LINUX,
|
|
NULL, 0,
|
|
NULL, 0 },
|
|
|
|
};
|
|
|
|
|
|
|
|
static int parse_type(char *string);
|
|
static void usage(void);
|
|
static void seed(void);
|
|
|
|
static pkt_example* find_example(int type);
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
|
|
wtap_dumper *dump;
|
|
struct wtap_pkthdr pkthdr;
|
|
union wtap_pseudo_header ps_header;
|
|
int i, j, len_this_pkt, len_random, err;
|
|
guint8 buffer[65536];
|
|
|
|
int opt;
|
|
int produce_count = 1000; /* number of pkts to produce */
|
|
int produce_type = PKT_ETHERNET;
|
|
char *produce_filename = NULL;
|
|
int produce_max_bytes = 5000;
|
|
pkt_example *example;
|
|
|
|
while ((opt = getopt(argc, argv, "b:c:ht:")) != -1) {
|
|
switch (opt) {
|
|
case 'b': /* max bytes */
|
|
produce_max_bytes = atoi(optarg);
|
|
if (produce_max_bytes > 65536) {
|
|
fprintf(stderr,
|
|
"randpkt: Max bytes is 65536\n");
|
|
exit(1);
|
|
}
|
|
break;
|
|
|
|
case 'c': /* count */
|
|
produce_count = atoi(optarg);
|
|
break;
|
|
|
|
case 't': /* type of packet to produce */
|
|
produce_type = parse_type(optarg);
|
|
break;
|
|
|
|
case 'h':
|
|
default:
|
|
usage();
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* any more command line parameters? */
|
|
if (argc > optind) {
|
|
produce_filename = argv[optind];
|
|
}
|
|
else {
|
|
usage();
|
|
}
|
|
|
|
example = find_example(produce_type);
|
|
|
|
|
|
dump = wtap_dump_open(produce_filename, WTAP_FILE_PCAP,
|
|
example->sample_wtap_encap, produce_max_bytes, FALSE /* compressed */, &err);
|
|
if (!dump) {
|
|
fprintf(stderr,
|
|
"randpkt: Error writing to %s\n", produce_filename);
|
|
exit(2);
|
|
}
|
|
|
|
seed();
|
|
|
|
/* reduce max_bytes by # of bytes already in sample */
|
|
if (produce_max_bytes <= example->sample_length) {
|
|
fprintf(stderr,
|
|
"randpkt: Sample packet length is %d, which is greater than or equal to\n",
|
|
example->sample_length);
|
|
fprintf(stderr, "your requested max_bytes value of %d\n",
|
|
produce_max_bytes);
|
|
exit(1);
|
|
}
|
|
else {
|
|
produce_max_bytes -= example->sample_length;
|
|
}
|
|
|
|
memset(&pkthdr, 0, sizeof(pkthdr));
|
|
memset(&ps_header, 0, sizeof(ps_header));
|
|
memset(buffer, 0, sizeof(buffer));
|
|
|
|
pkthdr.pkt_encap = example->sample_wtap_encap;
|
|
|
|
/* Load the sample pseudoheader into our pseudoheader buffer */
|
|
if (example->pseudo_buffer)
|
|
memcpy(&ps_header, example->pseudo_buffer, example->pseudo_length);
|
|
|
|
/* Load the sample into our buffer */
|
|
if (example->sample_buffer)
|
|
memcpy(&buffer[0], example->sample_buffer, example->sample_length);
|
|
|
|
/* Produce random packets */
|
|
for (i = 0; i < produce_count; i++) {
|
|
if (produce_max_bytes > 0) {
|
|
len_random = (rand() % produce_max_bytes + 1);
|
|
}
|
|
else {
|
|
len_random = 0;
|
|
}
|
|
|
|
len_this_pkt = example->sample_length + len_random;
|
|
|
|
pkthdr.caplen = len_this_pkt;
|
|
pkthdr.len = len_this_pkt;
|
|
pkthdr.ts.secs = i; /* just for variety */
|
|
|
|
for (j = example->pseudo_length; j < (int) sizeof(ps_header); j++) {
|
|
((guint8*)&ps_header)[j] = (rand() % 0x100);
|
|
}
|
|
|
|
for (j = example->sample_length; j < len_this_pkt; j++) {
|
|
/* Add format strings here and there */
|
|
if ((int) (100.0*rand()/(RAND_MAX+1.0)) < 3 && j < (len_random - 3)) {
|
|
memcpy(&buffer[j], "%s", 3);
|
|
j += 2;
|
|
} else {
|
|
buffer[j] = (rand() % 0x100);
|
|
}
|
|
}
|
|
|
|
wtap_dump(dump, &pkthdr, &ps_header, &buffer[0], &err);
|
|
}
|
|
|
|
wtap_dump_close(dump, &err);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
/* Print usage statement and exit program */
|
|
static
|
|
void usage(void)
|
|
{
|
|
int num_entries = array_length(examples);
|
|
int i;
|
|
|
|
printf("Usage: randpkt [-b maxbytes] [-c count] [-t type] filename\n");
|
|
printf("Default max bytes (per packet) is 5000\n");
|
|
printf("Default count is 1000.\n");
|
|
printf("Types:\n");
|
|
|
|
for (i = 0; i < num_entries; i++) {
|
|
printf("\t%s\t%s\n", examples[i].abbrev, examples[i].longname);
|
|
}
|
|
|
|
printf("\n");
|
|
|
|
exit(0);
|
|
}
|
|
|
|
/* Parse command-line option "type" and return enum type */
|
|
static
|
|
int parse_type(char *string)
|
|
{
|
|
int num_entries = array_length(examples);
|
|
int i;
|
|
|
|
for (i = 0; i < num_entries; i++) {
|
|
if (strcmp(examples[i].abbrev, string) == 0) {
|
|
return examples[i].produceable_type;
|
|
}
|
|
}
|
|
|
|
/* Complain */
|
|
fprintf(stderr, "randpkt: Type %s not known.\n", string);
|
|
exit(1);
|
|
}
|
|
|
|
/* Find pkt_example record and return pointer to it */
|
|
static
|
|
pkt_example* find_example(int type)
|
|
{
|
|
int num_entries = array_length(examples);
|
|
int i;
|
|
|
|
for (i = 0; i < num_entries; i++) {
|
|
if (examples[i].produceable_type == type) {
|
|
return &examples[i];
|
|
}
|
|
}
|
|
|
|
fprintf(stderr,
|
|
"randpkt: Internal error. Type %d has no entry in examples table.\n",
|
|
type);
|
|
exit(1);
|
|
}
|
|
|
|
/* Seed the random-number generator */
|
|
void
|
|
seed(void)
|
|
{
|
|
unsigned int randomness;
|
|
time_t now;
|
|
#ifndef _WIN32
|
|
int fd;
|
|
ssize_t ret;
|
|
|
|
#define RANDOM_DEV "/dev/urandom"
|
|
|
|
/*
|
|
* Assume it's at least worth trying /dev/urandom on UN*X.
|
|
* If it doesn't exist, fall back on time().
|
|
*
|
|
* XXX - Use CryptGenRandom on Windows?
|
|
*/
|
|
fd = open(RANDOM_DEV, O_RDONLY);
|
|
if (fd == -1) {
|
|
if (errno != ENOENT) {
|
|
fprintf(stderr,
|
|
"randpkt: Could not open " RANDOM_DEV " for reading: %s\n",
|
|
strerror(errno));
|
|
exit(2);
|
|
}
|
|
goto fallback;
|
|
}
|
|
|
|
ret = read(fd, &randomness, sizeof randomness);
|
|
if (ret == -1) {
|
|
fprintf(stderr,
|
|
"randpkt: Could not read from " RANDOM_DEV ": %s\n",
|
|
strerror(errno));
|
|
exit(2);
|
|
}
|
|
if ((size_t)ret != sizeof randomness) {
|
|
fprintf(stderr,
|
|
"randpkt: Tried to read %lu bytes from " RANDOM_DEV ", got %ld\n",
|
|
(unsigned long)sizeof randomness, (long)ret);
|
|
exit(2);
|
|
}
|
|
srand(randomness);
|
|
return;
|
|
|
|
fallback:
|
|
#endif
|
|
now = time(NULL);
|
|
randomness = (unsigned int) now;
|
|
|
|
srand(randomness);
|
|
}
|