598 lines
15 KiB
C
598 lines
15 KiB
C
/*
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* Copyright (c) 2012, Thingsquare, www.thingsquare.com.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* Author: Fredrik Osterlind <fredrik@thingsquare.com>
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* Based on wpcapslip.c by : Oliver Schmidt <ol.sc@web.de>
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*/
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/* This is a stripped-down version of wpcapslip: Instead of reading from and writing
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* to a serial port, this program just reads and writes to stdin/stdout. To
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* achieve the same functionality as wpcapslip, this program can hence be connected
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* to serialdump. But, in contrast to wpcapslip, this program can easily be connected
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* to networked or simulated serial ports. -- Fredrik, 2012 */
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef __CYGWIN__
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#include <alloca.h>
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#else /* __CYGWIN__ */
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#include <malloc.h>
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#endif /* __CYGWIN__ */
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/select.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#include <err.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#define PROGRESS(x)
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void wpcap_start(char *ethifaddr, char *netaddr, char *netmask, int logging);
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void wpcap_send(void *buf, int len);
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void raw_send(void *buf, int len);
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uint16_t wpcap_poll(char **buf, int eth);
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#include "net/tcpdump.h"
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static int should_print = 0;
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static int send_eth = 0; /* Sends ethernet frames or IP packets */
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#define IP_HLEN 20
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/*---------------------------------------------------------------------------*/
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uint16_t
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uip_htons(uint16_t val)
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{
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return UIP_HTONS(val);
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}
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/*---------------------------------------------------------------------------*/
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uint32_t
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uip_htonl(uint32_t val)
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{
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return UIP_HTONL(val);
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}
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/*---------------------------------------------------------------------------*/
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static void
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print_packet(char* prefix, uint8_t *packet, int len)
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{
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char buf[2000];
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if(should_print) {
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tcpdump_format(packet, len, buf, sizeof(buf));
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fprintf(stderr, "%s: %s\n", prefix, buf);
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}
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}
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/*---------------------------------------------------------------------------*/
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void cleanup(void);
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/*---------------------------------------------------------------------------*/
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void
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sigcleanup(int signo)
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{
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fprintf(stderr, "signal %d\n", signo);
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exit(0); /* exit(0) will call cleanup() */
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}
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/*---------------------------------------------------------------------------*/
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#define SLIP_END 0300
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#define SLIP_ESC 0333
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#define SLIP_ESC_END 0334
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#define SLIP_ESC_ESC 0335
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struct ip {
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u_int8_t ip_vhl; /* version and header length */
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#define IP_V4 0x40
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#define IP_V 0xf0
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#define IP_HL 0x0f
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u_int8_t ip_tos; /* type of service */
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u_int16_t ip_len; /* total length */
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u_int16_t ip_id; /* identification */
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u_int16_t ip_off; /* fragment offset field */
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#define IP_RF 0x8000 /* reserved fragment flag */
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#define IP_DF 0x4000 /* dont fragment flag */
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#define IP_MF 0x2000 /* more fragments flag */
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#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
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u_int8_t ip_ttl; /* time to live */
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u_int8_t ip_p; /* protocol */
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u_int16_t ip_sum; /* checksum */
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u_int32_t ip_src, ip_dst; /* source and dest address */
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u_int16_t uh_sport; /* source port */
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u_int16_t uh_dport; /* destination port */
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u_int16_t uh_ulen; /* udp length */
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u_int16_t uh_sum; /* udp checksum */
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};
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static int ip_id, last_id;
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int
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ssystem(const char *fmt, ...) __attribute__((__format__ (__printf__, 1, 2)));
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int
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ssystem(const char *fmt, ...)
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{
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char cmd[128];
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va_list ap;
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va_start(ap, fmt);
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vsnprintf(cmd, sizeof(cmd), fmt, ap);
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va_end(ap);
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fprintf(stderr, "%s\n", cmd);
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fflush(stderr);
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return system(cmd);
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}
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/*---------------------------------------------------------------------------*/
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int
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is_sensible_string(const unsigned char *s, int len)
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{
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int i;
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for(i = 1; i < len; i++) {
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if(s[i] == 0 || s[i] == '\r' || s[i] == '\n' || s[i] == '\t') {
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continue;
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} else if(s[i] < ' ' || '~' < s[i]) {
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return 0;
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}
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}
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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u_int16_t
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ip4sum(u_int16_t sum, const void *_p, u_int16_t len)
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{
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u_int16_t t;
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const u_int8_t *p = _p;
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const u_int8_t *end = p + len;
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while(p < (end - 1)) {
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t = (p[0] << 8) + p[1];
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sum += t;
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if(sum < t)
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sum++;
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p += 2;
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}
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if(p < end) {
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t = (p[0] << 8) + 0;
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sum += t;
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if(sum < t)
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sum++;
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}
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return sum;
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}
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/*---------------------------------------------------------------------------*/
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static uint16_t
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chksum(const void *p, uint16_t len)
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{
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uint16_t sum = ip4sum(0, p, len);
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return (sum == 0) ? 0xffff : uip_htons(sum);
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}
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/*---------------------------------------------------------------------------*/
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int
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check_ip(const struct ip *ip, unsigned ip_len)
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{
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u_int16_t sum, ip_hl;
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if(send_eth) {
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return 0;
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}
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/* Check IP version and length. */
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if((ip->ip_vhl & IP_V) != IP_V4) {
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return -1;
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}
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if(uip_ntohs(ip->ip_len) > ip_len) {
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return -2;
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}
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if(uip_ntohs(ip->ip_len) < ip_len) {
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return -3;
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}
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/* Check IP header. */
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ip_hl = 4 * (ip->ip_vhl & IP_HL);
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sum = ip4sum(0, ip, ip_hl);
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if(sum != 0xffff && sum != 0x0) {
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return -4;
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}
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if(ip->ip_p == 6 || ip->ip_p == 17) { /* Check TCP or UDP header. */
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u_int16_t tcp_len = ip_len - ip_hl;
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/* Sum pseudoheader. */
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sum = ip->ip_p + tcp_len; /* proto and len, no carry */
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sum = ip4sum(sum, &ip->ip_src, 8); /* src and dst */
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/* Sum TCP/UDP header and data. */
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sum = ip4sum(sum, (u_int8_t*)ip + ip_hl, tcp_len);
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/* Failed checksum test? */
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if(sum != 0xffff && sum != 0x0) {
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if(ip->ip_p == 6) { /* TCP == 6 */
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return -5;
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} else { /* UDP */
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/* Deal with disabled UDP checksums. */
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if(ip->uh_sum != 0) {
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return -6;
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}
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}
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}
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} else if(ip->ip_p == 1) { /* ICMP */
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u_int16_t icmp_len = ip_len - ip_hl;
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sum = ip4sum(0, (u_int8_t*)ip + ip_hl, icmp_len);
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if(sum != 0xffff && sum != 0x0) {
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return -7;
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}
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Read a single character from stdin. When we have a full packet, write it to
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* the network interface.
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*/
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void
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serial_to_wpcap(void)
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{
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static union {
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unsigned char inbuf[2000];
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struct ip iphdr;
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} uip;
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static int inbufptr = 0;
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int ret;
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unsigned char c;
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if(inbufptr >= sizeof(uip.inbuf)) {
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inbufptr = 0;
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return;
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}
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ret = read(STDIN_FILENO, &c, 1);
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if(ret <= 0) {
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err(1, "serial_to_wpcap: read");
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inbufptr = 0;
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return;
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}
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switch (c) {
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case SLIP_END:
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if(inbufptr > 0) {
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/*
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* Sanity checks.
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*/
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#define DEBUG_LINE_MARKER '\r'
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int ecode;
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ecode = check_ip(&uip.iphdr, inbufptr);
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if(ecode < 0 && inbufptr == 8
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&& strncmp((const char*)uip.inbuf, "=IPA", 4) == 0) {
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static struct in_addr ipa;
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inbufptr = 0;
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if(memcmp(&ipa, &uip.inbuf[4], sizeof(ipa)) == 0) {
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break;
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}
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memcpy(&ipa, &uip.inbuf[4], sizeof(ipa));
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break;
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} else if(ecode < 0) {
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/*
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* If sensible ASCII string, print it as debug info!
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*/
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/* printf("----------------------------------\n");*/
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if(uip.inbuf[0] == DEBUG_LINE_MARKER) {
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fwrite(uip.inbuf + 1, inbufptr - 1, 1, stderr);
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} else if(is_sensible_string(uip.inbuf, inbufptr)) {
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fwrite(uip.inbuf, inbufptr, 1, stderr);
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} else {
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fprintf(stderr, "serial_to_wpcap: drop packet len=%d ecode=%d\n",
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inbufptr, ecode);
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}
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inbufptr = 0;
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break;
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}
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PROGRESS("s");
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if(send_eth) {
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raw_send(uip.inbuf, inbufptr);
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} else {
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/* printf("Sending to wpcap\n");*/
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if(uip.iphdr.ip_id != last_id) {
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last_id = uip.iphdr.ip_id;
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print_packet("to wpcap: ", uip.inbuf, inbufptr);
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wpcap_send(uip.inbuf, inbufptr);
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} else {
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/*print_packet("IGNORED to wpcap: ", uip.inbuf, inbufptr);*/
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}
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}
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/* printf("After sending to wpcap\n");*/
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inbufptr = 0;
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}
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break;
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case SLIP_ESC:
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/* TODO We do not actually check that we have another byte incoming, so
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* we may block here */
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read(STDIN_FILENO, &c, 1);
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switch (c) {
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case SLIP_ESC_END:
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c = SLIP_END;
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break;
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case SLIP_ESC_ESC:
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c = SLIP_ESC;
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break;
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}
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/* FALLTHROUGH */
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default:
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uip.inbuf[inbufptr++] = c;
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break;
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}
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}
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/*---------------------------------------------------------------------------*/
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unsigned char stdout_buf[2000];
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int stdout_buf_cnt;
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/*---------------------------------------------------------------------------*/
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void
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stdout_write(unsigned char c)
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{
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if(stdout_buf_cnt >= sizeof(stdout_buf)) {
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err(1, "stdout_write overflow");
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}
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stdout_buf[stdout_buf_cnt] = c;
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stdout_buf_cnt++;
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}
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/*---------------------------------------------------------------------------*/
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int
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stdout_buf_empty(void)
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{
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return stdout_buf_cnt == 0;
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}
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/*---------------------------------------------------------------------------*/
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void
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stdout_flushbuf(void)
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{
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if(stdout_buf_empty()) {
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return;
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}
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fwrite(stdout_buf, stdout_buf_cnt, 1, stdout);
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stdout_buf_cnt = 0;
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fflush(stdout);
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}
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/*---------------------------------------------------------------------------*/
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void
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write_slip_stdout(void *inbuf, int len)
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{
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u_int8_t *p = inbuf;
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int i, ecode;
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struct ip *iphdr = inbuf;
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if(!send_eth) {
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/*
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* Sanity checks.
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*/
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/*fprintf(stderr, "write_slip_stdout: %d\n", len);*/
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ecode = check_ip(inbuf, len);
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if(ecode < 0) {
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fprintf(stderr, "write_slip_stdout: drop packet %d\n", ecode);
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return;
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}
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if(iphdr->ip_id == 0 && iphdr->ip_off & IP_DF) {
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uint16_t nid = uip_htons(ip_id++);
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iphdr->ip_id = nid;
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nid = ~nid; /* negate */
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iphdr->ip_sum += nid; /* add */
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if(iphdr->ip_sum < nid) { /* 1-complement overflow? */
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iphdr->ip_sum++;
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}
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ecode = check_ip(inbuf, len);
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if(ecode < 0) {
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fprintf(stderr, "write_slip_stdout: drop packet %d\n", ecode);
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return;
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}
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}
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iphdr->ip_ttl = uip_htons(uip_htons(iphdr->ip_ttl) + 1);
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if(iphdr->ip_ttl == 0) {
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fprintf(stderr, "Packet with ttl %d dropped\n", iphdr->ip_ttl);
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return;
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}
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iphdr->ip_sum = 0;
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iphdr->ip_sum = ~chksum(iphdr, 4 * (iphdr->ip_vhl & IP_HL));
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ecode = check_ip(inbuf, len);
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if(ecode < 0) {
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fprintf(stderr, "write_slip_stdout: drop packet %d\n", ecode);
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return;
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}
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}
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for(i = 0; i < len; i++) {
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switch (p[i]) {
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case SLIP_END:
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stdout_write(SLIP_ESC);
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stdout_write(SLIP_ESC_END);
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break;
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case SLIP_ESC:
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stdout_write(SLIP_ESC);
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stdout_write(SLIP_ESC_ESC);
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break;
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default:
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stdout_write(p[i]);
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break;
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}
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}
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stdout_write(SLIP_END);
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/* printf("slip end\n");*/
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PROGRESS("t");
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}
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/*---------------------------------------------------------------------------*/
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/*const char *ipaddr;*/
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/*const char *netmask;*/
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static int got_sigalarm;
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void
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sigalarm(int signo)
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{
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got_sigalarm = 1;
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return;
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}
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/*---------------------------------------------------------------------------*/
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void
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sigalarm_reset(void)
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{
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#ifdef linux
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#define TIMEOUT (997*1000)
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#else
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#define TIMEOUT (2451*1000)
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#endif
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ualarm(TIMEOUT, TIMEOUT);
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got_sigalarm = 0;
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}
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/*---------------------------------------------------------------------------*/
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int
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main(int argc, char **argv)
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{
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int c;
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int ret;
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char buf[4000];
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int logging = 0;
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ip_id = getpid() * time(NULL);
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while((c = getopt(argc, argv, "E:D:hl:t:T")) != -1) {
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switch (c) {
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case 'E':
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send_eth = 1;
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break;
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case 'T':
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should_print = 1;
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break;
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case 'l':
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logging = 1;
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break;
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case '?':
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case 'h':
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default:
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err(1,
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"usage: wpcapstdio [-E] [-l] [-T] <IP address of local Ethernet card> <IP address of SLIP network> <netmask of SLIP network>");
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break;
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}
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}
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argc -= (optind - 1);
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argv += (optind - 1);
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if(argc != 4) {
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err(1, "usage: wpcapstdio [-E] [-T] <IP address of local Ethernet card> <IP address of SLIP network> <netmask of SLIP network>");
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}
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wpcap_start(argv[1], argv[2], argv[3], logging);
|
|
stdout_write(SLIP_END);
|
|
|
|
atexit(cleanup);
|
|
signal(SIGHUP, sigcleanup);
|
|
signal(SIGTERM, sigcleanup);
|
|
signal(SIGINT, sigcleanup);
|
|
signal(SIGALRM, sigalarm);
|
|
|
|
while(1) {
|
|
if(got_sigalarm) {
|
|
/* Send "?IPA". */
|
|
stdout_write('?');
|
|
stdout_write('I');
|
|
stdout_write('P');
|
|
stdout_write('A');
|
|
stdout_write(SLIP_END);
|
|
got_sigalarm = 0;
|
|
}
|
|
|
|
if(stdout_buf_empty()) {
|
|
char *pbuf = buf;
|
|
|
|
ret = wpcap_poll(&pbuf, send_eth);
|
|
if(ret > 0) {
|
|
if(send_eth) {
|
|
write_slip_stdout(pbuf, ret);
|
|
stdout_flushbuf();
|
|
} else {
|
|
struct ip *iphdr = (struct ip *)pbuf;
|
|
if(iphdr->ip_id != last_id) {
|
|
/*last_id = iphdr->ip_id;*/
|
|
print_packet("to stdout: ", (uint8_t*)pbuf, ret);
|
|
write_slip_stdout(pbuf, ret);
|
|
stdout_flushbuf();
|
|
} else {
|
|
/*print_packet("IGNORED to stdout: ", (uint8_t*)pbuf, ret);*/
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if(!stdout_buf_empty()) {
|
|
stdout_flushbuf();
|
|
}
|
|
|
|
{
|
|
fd_set s_rd;
|
|
struct timeval tv;
|
|
|
|
tv.tv_sec = 0;
|
|
tv.tv_usec = 100;
|
|
|
|
do {
|
|
FD_ZERO(&s_rd);
|
|
FD_SET(fileno(stdin), &s_rd);
|
|
select(fileno(stdin) + 1, &s_rd, NULL, NULL, &tv);
|
|
if(FD_ISSET(fileno(stdin), &s_rd)) {
|
|
serial_to_wpcap();
|
|
}
|
|
} while(FD_ISSET(fileno(stdin), &s_rd));
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|