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osd-contiki/tools/wpcapslip/wpcapslip.c
adamdunkels 57f2dfa743 Decrease TTL for forwarded packets
2008-02-24 21:14:25 +00:00

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/*
* Copyright (c) 2007, Swedish Institute of Computer Science.
* 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.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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.
*
* This file is part of the Contiki operating system.
*
* Author: Oliver Schmidt <ol.sc@web.de>
*
* $Id: wpcapslip.c,v 1.2 2008/02/24 21:14:25 adamdunkels Exp $
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef __CYGWIN__
#include <alloca.h>
#else /* __CYGWIN__ */
#include <malloc.h>
#endif /* __CYGWIN__ */
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/select.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <err.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define PROGRESS(x)
void wpcap_start(char *ethifaddr, char *netaddr, char *netmask);
void wpcap_send(void *buf, int len);
uint16_t wpcap_poll(char **buf);
#include "net/tcpdump.h"
static int should_print = 0;
#define IP_HLEN 20
/*---------------------------------------------------------------------------*/
static void
print_packet(uint8_t *packet, int len)
{
char buf[2000];
if(should_print) {
tcpdump_format(packet, len, buf, sizeof(buf));
printf("%s\n", buf);
}
}
/*---------------------------------------------------------------------------*/
void cleanup(void);
/*---------------------------------------------------------------------------*/
void
sigcleanup(int signo)
{
fprintf(stderr, "signal %d\n", signo);
exit(0); /* exit(0) will call cleanup() */
}
/*---------------------------------------------------------------------------*/
#define SLIP_END 0300
#define SLIP_ESC 0333
#define SLIP_ESC_END 0334
#define SLIP_ESC_ESC 0335
struct ip {
u_int8_t ip_vhl; /* version and header length */
#define IP_V4 0x40
#define IP_V 0xf0
#define IP_HL 0x0f
u_int8_t ip_tos; /* type of service */
u_int16_t ip_len; /* total length */
u_int16_t ip_id; /* identification */
u_int16_t ip_off; /* fragment offset field */
#define IP_RF 0x8000 /* reserved fragment flag */
#define IP_DF 0x4000 /* dont fragment flag */
#define IP_MF 0x2000 /* more fragments flag */
#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
u_int8_t ip_ttl; /* time to live */
u_int8_t ip_p; /* protocol */
u_int16_t ip_sum; /* checksum */
u_int32_t ip_src, ip_dst; /* source and dest address */
u_int16_t uh_sport; /* source port */
u_int16_t uh_dport; /* destination port */
u_int16_t uh_ulen; /* udp length */
u_int16_t uh_sum; /* udp checksum */
};
static int ip_id, last_id;
int
ssystem(const char *fmt, ...) __attribute__((__format__ (__printf__, 1, 2)));
int
ssystem(const char *fmt, ...)
{
char cmd[128];
va_list ap;
va_start(ap, fmt);
vsnprintf(cmd, sizeof(cmd), fmt, ap);
va_end(ap);
printf("%s\n", cmd);
fflush(stdout);
return system(cmd);
}
int
is_sensible_string(const unsigned char *s, int len)
{
int i;
for(i = 1; i < len; i++) {
if(s[i] == 0 || s[i] == '\r' || s[i] == '\n' || s[i] == '\t') {
continue;
} else if(s[i] < ' ' || '~' < s[i]) {
return 0;
}
}
return 1;
}
u_int16_t
ip4sum(u_int16_t sum, const void *_p, u_int16_t len)
{
u_int16_t t;
const u_int8_t *p = _p;
const u_int8_t *end = p + len;
while(p < (end-1)) {
t = (p[0] << 8) + p[1];
sum += t;
if (sum < t) sum++;
p += 2;
}
if(p < end) {
t = (p[0] << 8) + 0;
sum += t;
if (sum < t) sum++;
}
return sum;
}
static uint16_t
chksum(const void *p, uint16_t len)
{
uint16_t sum = ip4sum(0, p, len);
return (sum == 0) ? 0xffff : htons(sum);
}
int
check_ip(const struct ip *ip, unsigned ip_len)
{
u_int16_t sum, ip_hl;
/* Check IP version and length. */
if((ip->ip_vhl & IP_V) != IP_V4) {
return -1;
}
if(ntohs(ip->ip_len) > ip_len) {
return -2;
}
if(ntohs(ip->ip_len) < ip_len) {
return -3;
}
/* Check IP header. */
ip_hl = 4*(ip->ip_vhl & IP_HL);
sum = ip4sum(0, ip, ip_hl);
if(sum != 0xffff && sum != 0x0) {
return -4;
}
if(ip->ip_p == 6 || ip->ip_p == 17) { /* Check TCP or UDP header. */
u_int16_t tcp_len = ip_len - ip_hl;
/* Sum pseudoheader. */
sum = ip->ip_p + tcp_len; /* proto and len, no carry */
sum = ip4sum(sum, &ip->ip_src, 8); /* src and dst */
/* Sum TCP/UDP header and data. */
sum = ip4sum(sum, (u_int8_t*)ip + ip_hl, tcp_len);
/* Failed checksum test? */
if(sum != 0xffff && sum != 0x0) {
if(ip->ip_p == 6) { /* TCP == 6 */
return -5;
} else { /* UDP */
/* Deal with disabled UDP checksums. */
if(ip->uh_sum != 0) {
return -6;
}
}
}
} else if (ip->ip_p == 1) { /* ICMP */
u_int16_t icmp_len = ip_len - ip_hl;
sum = ip4sum(0, (u_int8_t*)ip + ip_hl, icmp_len);
if(sum != 0xffff && sum != 0x0) {
return -7;
}
}
return 0;
}
/*
* Read from serial, when we have a packet write it to tun. No output
* buffering, input buffered by stdio.
*/
void
serial_to_wpcap(FILE *inslip)
{
static union {
unsigned char inbuf[2000];
struct ip iphdr;
} uip;
static int inbufptr = 0;
int ret;
unsigned char c;
#ifdef linux
ret = fread(&c, 1, 1, inslip);
if(ret == -1 || ret == 0) err(1, "serial_to_tun: read");
goto after_fread;
#endif
read_more:
if(inbufptr >= sizeof(uip.inbuf)) {
inbufptr = 0;
}
ret = fread(&c, 1, 1, inslip);
#ifdef linux
after_fread:
#endif
if(ret == -1) {
err(1, "serial_to_tun: read");
}
if(ret == 0) {
clearerr(inslip);
return;
fprintf(stderr, "serial_to_tun: EOF\n");
exit(1);
}
/* fprintf(stderr, ".");*/
switch(c) {
case SLIP_END:
if(inbufptr > 0) {
/*
* Sanity checks.
*/
#define DEBUG_LINE_MARKER '\r'
int ecode;
ecode = check_ip(&uip.iphdr, inbufptr);
if(ecode < 0 && inbufptr == 8 && strncmp(uip.inbuf, "=IPA", 4) == 0) {
static struct in_addr ipa;
inbufptr = 0;
if(memcmp(&ipa, &uip.inbuf[4], sizeof(ipa)) == 0) {
break;
}
/* New address. */
if(ipa.s_addr != 0) {
#if 0
#ifdef linux
ssystem("route delete -net %s netmask %s dev %s",
inet_ntoa(ipa), "255.255.255.255", tundev);
#else
ssystem("route delete -net %s -netmask %s -interface %s",
inet_ntoa(ipa), "255.255.255.255", tundev);
#endif
#endif /* 0 */
}
memcpy(&ipa, &uip.inbuf[4], sizeof(ipa));
if(ipa.s_addr != 0) {
#if 0
#ifdef linux
ssystem("route add -net %s netmask %s dev %s",
inet_ntoa(ipa), "255.255.255.255", tundev);
#else
ssystem("route add -net %s -netmask %s -interface %s",
inet_ntoa(ipa), "255.255.255.255", tundev);
#endif
#endif /* 0 */
}
break;
} else if(ecode < 0) {
/*
* If sensible ASCII string, print it as debug info!
*/
/* printf("----------------------------------\n");*/
if(uip.inbuf[0] == DEBUG_LINE_MARKER) {
fwrite(uip.inbuf + 1, inbufptr - 1, 1, stderr);
} else if(is_sensible_string(uip.inbuf, inbufptr)) {
fwrite(uip.inbuf, inbufptr, 1, stderr);
} else {
fprintf(stderr,
"serial_to_tun: drop packet len=%d ecode=%d\n",
inbufptr, ecode);
}
inbufptr = 0;
break;
}
PROGRESS("s");
#if 0
if(dhsock != -1) {
struct ip *ip = (void *)uip.inbuf;
if(ip->ip_p == 17 && ip->ip_dst == 0xffffffff /* UDP and broadcast */
&& ip->uh_sport == ntohs(BOOTPC) && ip->uh_dport == ntohs(BOOTPS)) {
relay_dhcp_to_server(ip, inbufptr);
inbufptr = 0;
}
}
#endif /* 0 */
/* if(write(outfd, uip.inbuf, inbufptr) != inbufptr) {
err(1, "serial_to_tun: write");
}*/
/* printf("Sending to wpcap\n");*/
print_packet(uip.inbuf, inbufptr);
wpcap_send(uip.inbuf, inbufptr);
/* printf("After sending to wpcap\n");*/
inbufptr = 0;
}
break;
case SLIP_ESC:
if(fread(&c, 1, 1, inslip) != 1) {
clearerr(inslip);
/* Put ESC back and give up! */
ungetc(SLIP_ESC, inslip);
return;
}
switch(c) {
case SLIP_ESC_END:
c = SLIP_END;
break;
case SLIP_ESC_ESC:
c = SLIP_ESC;
break;
}
/* FALLTHROUGH */
default:
uip.inbuf[inbufptr++] = c;
break;
}
goto read_more;
}
/*---------------------------------------------------------------------------*/
unsigned char slip_buf[2000];
int slip_end, slip_begin;
/*---------------------------------------------------------------------------*/
void
slip_send(int fd, unsigned char c)
{
if(slip_end >= sizeof(slip_buf)) {
err(1, "slip_send overflow");
}
slip_buf[slip_end] = c;
slip_end++;
}
/*---------------------------------------------------------------------------*/
int
slip_empty()
{
return slip_end == 0;
}
/*---------------------------------------------------------------------------*/
void
slip_flushbuf(int fd)
{
int n;
if (slip_empty())
return;
n = write(fd, slip_buf + slip_begin, (slip_end - slip_begin));
if(n == -1 && errno != EAGAIN) {
err(1, "slip_flushbuf write failed");
} else if(n == -1) {
PROGRESS("Q"); /* Outqueueis full! */
} else {
slip_begin += n;
if(slip_begin == slip_end) {
slip_begin = slip_end = 0;
}
}
}
/*---------------------------------------------------------------------------*/
void
write_to_serial(int outfd, void *inbuf, int len)
{
u_int8_t *p = inbuf;
int i, ecode;
struct ip *iphdr = inbuf;
/*
* Sanity checks.
*/
ecode = check_ip(inbuf, len);
if(ecode < 0) {
fprintf(stderr, "write_to_serial: drop packet %d\n", ecode);
return;
}
if(iphdr->ip_id == 0 && iphdr->ip_off & IP_DF) {
uint16_t nid = htons(ip_id++);
iphdr->ip_id = nid;
nid = ~nid; /* negate */
iphdr->ip_sum += nid; /* add */
if(iphdr->ip_sum < nid) { /* 1-complement overflow? */
iphdr->ip_sum++;
}
ecode = check_ip(inbuf, len);
if(ecode < 0) {
fprintf(stderr, "write_to_serial: drop packet %d\n", ecode);
return;
}
}
iphdr->ip_ttl = htons(htons(iphdr->ip_ttl) + 1);
if(iphdr->ip_ttl == 0) {
fprintf(stderr, "Packet with ttl %d dropped\n", iphdr->ip_ttl);
return;
}
iphdr->ip_sum = 0;
iphdr->ip_sum = ~chksum(iphdr, 4 * (iphdr->ip_vhl & IP_HL));
ecode = check_ip(inbuf, len);
if(ecode < 0) {
fprintf(stderr, "write_to_serial: drop packet %d\n", ecode);
return;
}
/* It would be ``nice'' to send a SLIP_END here but it's not
* really necessary.
*/
/* slip_send(outfd, SLIP_END); */
for(i = 0; i < len; i++) {
switch(p[i]) {
case SLIP_END:
slip_send(outfd, SLIP_ESC);
slip_send(outfd, SLIP_ESC_END);
break;
case SLIP_ESC:
slip_send(outfd, SLIP_ESC);
slip_send(outfd, SLIP_ESC_ESC);
break;
default:
slip_send(outfd, p[i]);
break;
}
}
slip_send(outfd, SLIP_END);
/* printf("slip end\n");*/
PROGRESS("t");
}
/*---------------------------------------------------------------------------*/
/*
* Read from tun, write to slip.
*/
#if 0
void
tun_to_serial(int infd, int outfd)
{
static union {
unsigned char inbuf[2000];
struct ip iphdr;
} uip;
int size;
if((size = read(infd, uip.inbuf, 2000)) == -1) {
err(1, "tun_to_serial: read");
}
write_to_serial(outfd, uip.inbuf, size);
}
#endif /* 0 */
/*---------------------------------------------------------------------------*/
#ifndef BAUDRATE
#define BAUDRATE B115200
#endif
speed_t b_rate = BAUDRATE;
void
cfmakeraw(t)
struct termios *t;
{
t->c_iflag &= ~(IMAXBEL|IXOFF|INPCK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON|IGNPAR);
t->c_iflag |= IGNBRK;
t->c_oflag &= ~OPOST;
t->c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|ICANON|ISIG|IEXTEN|NOFLSH|TOSTOP);
t->c_cflag &= ~(CSIZE|PARENB);
t->c_cflag |= CS8|CREAD;
t->c_cc[VMIN] = 1;
t->c_cc[VTIME] = 0;
}
void
stty_telos(int fd)
{
struct termios options;
speed_t speed = b_rate;
/* if(fcntl(fd, F_SETFL, 0) < 0) {
perror("could not set fcntl");
exit(-1);
}*/
if(tcgetattr(fd, &options) < 0) {
perror("could not get options");
exit(-1);
}
cfsetispeed(&options, speed);
cfsetospeed(&options, speed);
/* Enable the receiver and set local mode */
options.c_cflag |= (CLOCAL | CREAD);
/* Mask the character size bits and turn off (odd) parity */
options.c_cflag &= ~(CSIZE|PARENB|PARODD);
/* Select 8 data bits */
options.c_cflag |= CS8;
/* Raw input */
options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
/* Raw output */
options.c_oflag &= ~OPOST;
if (tcsetattr(fd, TCSANOW, &options) < 0) {
perror("could not set options");
exit(-1);
}
#if 0
struct termios tty;
speed_t speed = b_rate;
int i;
if(tcflush(fd, TCIOFLUSH) == -1) err(1, "tcflush");
if(tcgetattr(fd, &tty) == -1) err(1, "tcgetattr");
cfmakeraw(&tty);
/* Nonblocking read. */
tty.c_cc[VTIME] = 0;
tty.c_cc[VMIN] = 0;
tty.c_cflag &= ~CRTSCTS;
tty.c_cflag &= ~HUPCL;
tty.c_cflag &= ~CLOCAL;
cfsetispeed(&tty, speed);
cfsetospeed(&tty, speed);
if(tcsetattr(fd, TCSAFLUSH, &tty) == -1) err(1, "tcsetattr");
#if 1
/* Nonblocking read and write. */
/* if(fcntl(fd, F_SETFL, O_NONBLOCK) == -1) err(1, "fcntl"); */
tty.c_cflag |= CLOCAL;
if(tcsetattr(fd, TCSAFLUSH, &tty) == -1) err(1, "tcsetattr");
i = TIOCM_DTR;
if(ioctl(fd, TIOCMBIS, &i) == -1) err(1, "ioctl");
#endif
usleep(10*1000); /* Wait for hardware 10ms. */
/* Flush input and output buffers. */
if(tcflush(fd, TCIOFLUSH) == -1) err(1, "tcflush");
#endif /* 0 */
}
/*---------------------------------------------------------------------------*/
int
devopen(const char *dev, int flags)
{
char t[32];
strcpy(t, "/dev/");
strcat(t, dev);
return open(t, flags);
}
/*---------------------------------------------------------------------------*/
/*const char *ipaddr;*/
/*const char *netmask;*/
static int got_sigalarm;
void
sigalarm(int signo)
{
got_sigalarm = 1;
return;
}
/*---------------------------------------------------------------------------*/
void
sigalarm_reset()
{
#ifdef linux
#define TIMEOUT (997*1000)
#else
#define TIMEOUT (2451*1000)
#endif
ualarm(TIMEOUT, TIMEOUT);
got_sigalarm = 0;
}
/*---------------------------------------------------------------------------*/
int
main(int argc, char **argv)
{
int c;
int slipfd, maxfd;
int ret;
fd_set rset, wset;
FILE *inslip;
const char *siodev = NULL;
const char *dhcp_server = NULL;
/* u_int16_t myport = BOOTPS, dhport = BOOTPS;*/
int baudrate = -2;
char buf[4000];
ip_id = getpid() * time(NULL);
setvbuf(stdout, NULL, _IOLBF, 0); /* Line buffered output. */
while((c = getopt(argc, argv, "B:D:hs:t:T")) != -1) {
switch (c) {
case 'B':
baudrate = atoi(optarg);
break;
case 'D':
dhcp_server = optarg;
break;
case 's':
if(strncmp("/dev/", optarg, 5) == 0) {
siodev = optarg + 5;
} else {
siodev = optarg;
}
break;
#if 0
case 't':
if(strncmp("/dev/", optarg, 5) == 0) {
strcpy(tundev, optarg + 5);
} else {
strcpy(tundev, optarg);
}
break;
#endif /* 0 */
case 'T':
should_print = 1;
break;
case '?':
case 'h':
default:
err(1, "usage: wpcapslip [-B baudrate] [-s siodev] [-D dhcp-server] [-T] ipaddress netmask [dhcp-server]");
break;
}
}
argc -= (optind - 1);
argv += (optind - 1);
if(argc != 4) {
err(1, "usage: wpcapslip [-s siodev] [-D dhcp-server] [-T] <IP address of local Ethernet card> <IP address of SLIP network> <netmask of SLIP network>");
}
/* ipaddr = argv[1];
netmask = argv[2];*/
wpcap_start(argv[1], argv[2], argv[3]);
/* netaddr = inet_addr(ipaddr) & inet_addr(netmask);*/
switch(baudrate) {
case -2:
break; /* Use default. */
case 9600:
b_rate = B9600;
break;
case 19200:
b_rate = B19200;
break;
case 38400:
b_rate = B38400;
break;
case 57600:
b_rate = B57600;
break;
case 115200:
b_rate = B115200;
break;
default:
err(1, "unknown baudrate %d", baudrate);
break;
}
/*
* Set up DHCP relay agent socket and find the address of this relay
* agent.
*/
#if 0
if(argc == 4) {
dhcp_server = argv[3];
}
if(dhcp_server != NULL) {
struct sockaddr_in myaddr;
socklen_t len;
in_addr_t a;
if(strchr(dhcp_server, ':') != NULL) {
dhport = atoi(strchr(dhcp_server, ':') + 1);
myport = dhport + 1;
*strchr(dhcp_server, ':') = '\0';
}
a = inet_addr(dhcp_server);
if(a == -1) {
err(1, "illegal dhcp-server address");
}
#ifndef linux
dhaddr.sin_len = sizeof(dhaddr);
#endif
dhaddr.sin_family = AF_INET;
dhaddr.sin_port = htons(dhport);
dhaddr.sin_addr.s_addr = a;
dhsock = socket(AF_INET, SOCK_DGRAM, 0);
if(dhsock < 0) {
err (1, "socket");
}
memset(&myaddr, 0x0, sizeof(myaddr));
#ifndef linux
myaddr.sin_len = sizeof(myaddr);
#endif
myaddr.sin_family = AF_INET;
myaddr.sin_addr.s_addr = INADDR_ANY;
myaddr.sin_port = htons(myport);
if(bind(dhsock, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0) {
err(1, "bind dhcp-relay");
}
if(connect(dhsock, (struct sockaddr *)&dhaddr, sizeof(dhaddr)) < 0) {
err(1, "connect to dhcp-server");
}
len = sizeof(myaddr);
if(getsockname(dhsock, (struct sockaddr *)&myaddr, &len) < 0) {
err(1, "getsockname dhsock");
}
giaddr = myaddr.sin_addr.s_addr;
/*
* Don't want connected socket.
*/
close(dhsock);
dhsock = socket(AF_INET, SOCK_DGRAM, 0);
if(dhsock < 0) {
err (1, "socket");
}
myaddr.sin_family = AF_INET;
myaddr.sin_addr.s_addr = INADDR_ANY;
myaddr.sin_port = htons(myport);
if(bind(dhsock, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0) {
err(1, "bind dhcp-relay");
}
fprintf(stderr, "DHCP server at %s:%d\n", dhcp_server, dhport);
}
#endif /* 0 */
if(siodev != NULL) {
slipfd = devopen(siodev, O_RDWR | O_NONBLOCK | O_NOCTTY | O_NDELAY | O_DIRECT | O_SYNC );
if(slipfd == -1) {
err(1, "can't open siodev ``/dev/%s''", siodev);
}
} else {
static const char *siodevs[] = {
"ttyUSB0", "cuaU0", "ucom0" /* linux, fbsd6, fbsd5 */
};
int i;
for(i = 0; i < 3; i++) {
siodev = siodevs[i];
slipfd = devopen(siodev, O_RDWR | O_NONBLOCK);
if(slipfd != -1) {
break;
}
}
if(slipfd == -1) {
err(1, "can't open siodev");
}
}
fprintf(stderr, "slip started on ``/dev/%s''\n", siodev);
stty_telos(slipfd);
slip_send(slipfd, SLIP_END);
inslip = fdopen(slipfd, "r");
if(inslip == NULL) {
err(1, "main: fdopen");
}
/* tunfd = tun_alloc(tundev);
if(tunfd == -1) err(1, "main: open");
fprintf(stderr, "opened device ``/dev/%s''\n", tundev);*/
atexit(cleanup);
signal(SIGHUP, sigcleanup);
signal(SIGTERM, sigcleanup);
signal(SIGINT, sigcleanup);
signal(SIGALRM, sigalarm);
/* ifconf(tundev, ipaddr, netmask);*/
while(1) {
maxfd = 0;
FD_ZERO(&rset);
FD_ZERO(&wset);
if(got_sigalarm) {
/* Send "?IPA". */
slip_send(slipfd, '?');
slip_send(slipfd, 'I');
slip_send(slipfd, 'P');
slip_send(slipfd, 'A');
slip_send(slipfd, SLIP_END);
got_sigalarm = 0;
}
if(!slip_empty()) { /* Anything to flush? */
FD_SET(slipfd, &wset);
}
FD_SET(slipfd, &rset); /* Read from slip ASAP! */
if(slipfd > maxfd) {
maxfd = slipfd;
}
/* We only have one packet at a time queued for slip output. */
if(slip_empty()) {
/* FD_SET(tunfd, &rset);
if(tunfd > maxfd) maxfd = tunfd;
if(dhsock != -1) {
FD_SET(dhsock, &rset);
if(dhsock > maxfd) maxfd = dhsock;
}*/
}
if(slip_empty()) {
char *pbuf = buf;
ret = wpcap_poll(&pbuf);
if(ret > 0) {
struct ip *iphdr = (struct ip *)pbuf;
if(iphdr->ip_id != last_id) {
last_id = iphdr->ip_id;
/* printf("------ wpcap_poll ret %d\n", ret);*/
print_packet(pbuf, ret);
write_to_serial(slipfd, pbuf, ret);
slip_flushbuf(slipfd);
sigalarm_reset();
}
}
/* } else {
printf("!slip_empty\n");*/
}
{
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 10;
ret = select(maxfd + 1, &rset, &wset, NULL, &tv);
}
if(ret == -1 && errno != EINTR) {
err(1, "select");
} else if(ret > 0) {
if(FD_ISSET(slipfd, &rset)) {
/* printf("serial_to_wpcap\n");*/
/*serial_to_tun(inslip, tunfd);*/
serial_to_wpcap(inslip);
/* printf("End of serial_to_wpcap\n");*/
}
if(FD_ISSET(slipfd, &wset)) {
/* printf("slip_flushbuf\n");*/
slip_flushbuf(slipfd);
sigalarm_reset();
}
/* if(slip_empty() && FD_ISSET(tunfd, &rset)) {
tun_to_serial(tunfd, slipfd);
slip_flushbuf(slipfd);
sigalarm_reset();
}*/
#if 0
if(dhsock != -1 && slip_empty() && FD_ISSET(dhsock, &rset)) {
relay_dhcp_to_client(slipfd);
slip_flushbuf(slipfd);
}
#endif /* 0 */
}
}
}
/*---------------------------------------------------------------------------*/
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