/*
* Read from serial, when we have a packet write it to tun. No output
* buffering, input buffered by stdio.
*/
void
serial_to_tun(FILE *inslip, int outfd)
{
static union {
unsigned char inbuf[2000];
} uip;
static unsigned 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
while (1) {
if (inbufptr >= sizeof(uip.inbuf)) {
if (timestamp) {
stamptime();
}
fprintf(stderr, "*** dropping large %d byte packet\n", inbufptr);
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, ".");*/
switch (c) {
case SLIP_END:
if (inbufptr > 0) {
if (uip.inbuf[0] == '!') {
if (uip.inbuf[1] == 'M') {
/* Read gateway MAC address and autoconfigure tap0 interface */
char macs[24];
unsigned int pos = 0;
for (unsigned int i = 0; i < 16; i++) {
macs[pos++] = uip.inbuf[2 + i];
if ((i & 1) == 1 && i < 14) {
macs[pos++] = ':';
}
}
if (timestamp) {
stamptime();
}
macs[pos] = '\0';
fprintf(stderr, "*** Gateway's MAC address: %s\n", macs);
if (timestamp) {
stamptime();
}
ssystem("ifconfig %s down", tundev);
if (timestamp) {
stamptime();
}
ssystem("ifconfig %s hw ether %s", tundev, &macs[6]);
if (timestamp) {
stamptime();
}
ssystem("ifconfig %s up", tundev);
}
}
else if (uip.inbuf[0] == '?') {
if (uip.inbuf[1] == 'P') {
/* Prefix info requested */
struct in6_addr addr;
char *s = strchr(ipaddr, '/');
if (s != NULL) {
*s = '\0';
}
inet_pton(AF_INET6, ipaddr, &addr);
if (timestamp) {
stamptime();
}
fprintf(stderr, "*** Address:%s => %02x%02x:%02x%02x:%02x%02x:%02x%02x\n",
ipaddr,
addr.s6_addr[0], addr.s6_addr[1],
addr.s6_addr[2], addr.s6_addr[3],
addr.s6_addr[4], addr.s6_addr[5],
addr.s6_addr[6], addr.s6_addr[7]);
slip_send(slipfd, '!');
slip_send(slipfd, 'P');
for (unsigned int i = 0; i < 8; i++) {
/* need to call the slip_send_char for stuffing */
slip_send_char(slipfd, addr.s6_addr[i]);
}
slip_send(slipfd, SLIP_END);
}
#define DEBUG_LINE_MARKER '\r'
}
else if (uip.inbuf[0] == DEBUG_LINE_MARKER) {
fwrite(uip.inbuf + 1, inbufptr - 1, 1, stdout);
}
else if (is_sensible_string(uip.inbuf, inbufptr)) {
if (verbose == 1) { /* strings already echoed below for verbose>1 */
if (timestamp) {
stamptime();
}
fwrite(uip.inbuf, inbufptr, 1, stdout);
}
}
else {
if (verbose > 2) {
if (timestamp) {
stamptime();
}
printf("Packet from SLIP of length %d - write TUN\n", inbufptr);
if (verbose > 4) {
#if WIRESHARK_IMPORT_FORMAT
printf("0000");
for (unsigned int i = 0; i < inbufptr; i++) {
printf(" %02x", uip.inbuf[i]);
}
#else
printf(" ");
for (unsigned int i = 0; i < inbufptr; i++) {
printf("%02x", uip.inbuf[i]);
if ((i & 3) == 3) {
printf(" ");
}
if ((i & 15) == 15) {
printf("\n ");
}
}
#endif
printf("\n");
}
}
if (write(outfd, uip.inbuf, inbufptr) != inbufptr) {
err(1, "serial_to_tun: write");
}
}
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;
/* Echo lines as they are received for verbose=2,3,5+ */
/* Echo all printable characters for verbose==4 */
if ((verbose == 2) || (verbose == 3) || (verbose > 4)) {
if (c == '\n') {
if (is_sensible_string(uip.inbuf, inbufptr)) {
if (timestamp) {
stamptime();
}
fwrite(uip.inbuf, inbufptr, 1, stdout);
inbufptr = 0;
}
}
}
else if (verbose == 4) {
if (c == 0 || c == '\r' || c == '\n' || c == '\t' || (c >= ' ' && c <= '~')) {
fwrite(&c, 1, 1, stdout);
if (c == '\n') if (timestamp) {
stamptime();
}
}
}
break;
}
}
}
void
write_to_serial(int outfd, void *inbuf, int len)
{
u_int8_t *p = inbuf;
int i;
if (verbose > 2) {
if (timestamp) {
stamptime();
}
printf("Packet from TUN of length %d - write SLIP\n", len);
if (verbose > 4) {
#if WIRESHARK_IMPORT_FORMAT
printf("0000");
for (i = 0; i < len; i++) {
printf(" %02x", p[i]);
}
#else
printf(" ");
for (i = 0; i < len; i++) {
printf("%02x", p[i]);
if ((i & 3) == 3) {
printf(" ");
}
if ((i & 15) == 15) {
printf("\n ");
}
}
#endif
printf("\n");
}
}
/* 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);
PROGRESS("t");
}
void
slip_send_char(int fd, unsigned char c)
{
switch(c) {
case SLIP_END:
slip_send(fd, SLIP_ESC);
slip_send(fd, SLIP_ESC_END);
break;
case SLIP_ESC:
slip_send(fd, SLIP_ESC);
slip_send(fd, SLIP_ESC_ESC);
break;
case XON:
if(flowcontrol_xonxoff) {
slip_send(fd, SLIP_ESC);
slip_send(fd, SLIP_ESC_XON);
} else {
slip_send(fd, c);
}
break;
case XOFF:
if(flowcontrol_xonxoff) {
slip_send(fd, SLIP_ESC);
slip_send(fd, SLIP_ESC_XOFF);
} else {
slip_send(fd, c);
}
break;
default:
slip_send(fd, c);
break;
}
}
int
main(int argc, char **argv)
{
int c;
int tunfd, maxfd;
int ret;
fd_set rset, wset;
FILE *inslip;
const char *siodev = NULL;
const char *host = NULL;
const char *port = NULL;
const char *prog;
int baudrate = -2;
int ipa_enable = 0;
int tap = 0;
slipfd = 0;
prog = argv[0];
setvbuf(stdout, NULL, _IOLBF, 0); /* Line buffered output. */
while((c = getopt(argc, argv, "B:HILPhXM:s:t:v::d::a:p:T")) != -1) {
switch(c) {
case 'B':
baudrate = atoi(optarg);
break;
case 'H':
flowcontrol=1;
break;
case 'X':
flowcontrol_xonxoff=1;
break;
case 'L':
timestamp=1;
break;
case 'M':
devmtu=atoi(optarg);
if(devmtu < MIN_DEVMTU) {
devmtu = MIN_DEVMTU;
}
case 'P':
showprogress=1;
break;
case 's':
if(strncmp("/dev/", optarg, 5) == 0) {
siodev = optarg + 5;
} else {
siodev = optarg;
}
break;
case 'I':
ipa_enable = 1;
fprintf(stderr, "Will inquire about IP address using IPA=\n");
break;
case 't':
if(strncmp("/dev/", optarg, 5) == 0) {
strncpy(tundev, optarg + 5, sizeof(tundev));
} else {
strncpy(tundev, optarg, sizeof(tundev));
}
break;
case 'a':
host = optarg;
break;
case 'p':
port = optarg;
break;
case 'd':
basedelay = 10;
if (optarg) basedelay = atoi(optarg);
break;
case 'v':
verbose = 2;
if (optarg) verbose = atoi(optarg);
break;
case 'T':
tap = 1;
break;
case '?':
case 'h':
default:
fprintf(stderr,"usage: %s [options] ipaddress\n", prog);
fprintf(stderr,"example: tunslip6 -L -v2 -s ttyUSB1 aaaa::1/64\n");
fprintf(stderr,"Options are:\n");
#ifndef __APPLE__
fprintf(stderr," -B baudrate 9600,19200,38400,57600,115200 (default),230400,460800,921600\n");
#else
fprintf(stderr," -B baudrate 9600,19200,38400,57600,115200 (default),230400\n");
#endif
fprintf(stderr," -H Hardware CTS/RTS flow control (default disabled)\n");
fprintf(stderr," -I Inquire IP address\n");
fprintf(stderr," -X Software XON/XOFF flow control (default disabled)\n");
fprintf(stderr," -L Log output format (adds time stamps)\n");
fprintf(stderr," -s siodev Serial device (default /dev/ttyUSB0)\n");
fprintf(stderr," -M Interface MTU (default and min: 1280)\n");
fprintf(stderr," -T Make tap interface (default is tun interface)\n");
fprintf(stderr," -t tundev Name of interface (default tap0 or tun0)\n");
fprintf(stderr," -v[level] Verbosity level\n");
fprintf(stderr," -v0 No messages\n");
fprintf(stderr," -v1 Encapsulated SLIP debug messages (default)\n");
fprintf(stderr," -v2 Printable strings after they are received\n");
fprintf(stderr," -v3 Printable strings and SLIP packet notifications\n");
fprintf(stderr," -v4 All printable characters as they are received\n");
fprintf(stderr," -v5 All SLIP packets in hex\n");
fprintf(stderr," -v Equivalent to -v3\n");
fprintf(stderr," -d[basedelay] Minimum delay between outgoing SLIP packets.\n");
fprintf(stderr," Actual delay is basedelay*(#6LowPAN fragments) milliseconds.\n");
fprintf(stderr," -d is equivalent to -d10.\n");
fprintf(stderr," -a serveraddr \n");
fprintf(stderr," -p serverport \n");
exit(1);
break;
}
}
argc -= (optind - 1);
argv += (optind - 1);
if(argc != 2 && argc != 3) {
err(1, "usage: %s [-B baudrate] [-H] [-L] [-s siodev] [-t tundev] [-T] [-v verbosity] [-d delay] [-a serveraddress] [-p serverport] ipaddress", prog);
}
ipaddr = argv[1];
if(baudrate != -2) { /* -2: use default baudrate */
b_rate = select_baudrate(baudrate);
if(b_rate == 0) {
err(1, "unknown baudrate %d", baudrate);
}
}
if(*tundev == '\0') {
/* Use default. */
if(tap) {
strcpy(tundev, "tap0");
} else {
strcpy(tundev, "tun0");
}
}
if(host != NULL) {
struct addrinfo hints, *servinfo, *p;
int rv;
char s[INET6_ADDRSTRLEN];
if(port == NULL) {
port = "60001";
}
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
if((rv = getaddrinfo(host, port, &hints, &servinfo)) != 0) {
err(1, "getaddrinfo: %s", gai_strerror(rv));
}
/* loop through all the results and connect to the first we can */
for(p = servinfo; p != NULL; p = p->ai_next) {
if((slipfd = socket(p->ai_family, p->ai_socktype,
p->ai_protocol)) == -1) {
perror("client: socket");
continue;
}
if(connect(slipfd, p->ai_addr, p->ai_addrlen) == -1) {
close(slipfd);
perror("client: connect");
continue;
}
break;
}
if(p == NULL) {
err(1, "can't connect to ``%s:%s''", host, port);
}
fcntl(slipfd, F_SETFL, O_NONBLOCK);
inet_ntop(p->ai_family, get_in_addr((struct sockaddr *)p->ai_addr),
s, sizeof(s));
fprintf(stderr, "slip connected to ``%s:%s''\n", s, port);
/* all done with this structure */
freeaddrinfo(servinfo);
} else {
if(siodev != NULL) {
slipfd = devopen(siodev, O_RDWR | O_NONBLOCK);
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");
}
}
if (timestamp) stamptime();
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, tap);
if(tunfd == -1) err(1, "main: open /dev/tun");
if (timestamp) stamptime();
fprintf(stderr, "opened %s device ``/dev/%s''\n",
tap ? "tap" : "tun", tundev);
atexit(cleanup);
signal(SIGHUP, sigcleanup);
signal(SIGTERM, sigcleanup);
signal(SIGINT, sigcleanup);
signal(SIGALRM, sigalarm);
ifconf(tundev, ipaddr);
while(1) {
maxfd = 0;
FD_ZERO(&rset);
FD_ZERO(&wset);
if(got_sigalarm && ipa_enable) {
/* 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;
}
ret = select(maxfd + 1, &rset, &wset, NULL, NULL);
if(ret == -1 && errno != EINTR) {
err(1, "select");
} else if(ret > 0) {
if(FD_ISSET(slipfd, &rset)) {
serial_to_tun(inslip, tunfd);
}
if(FD_ISSET(slipfd, &wset)) {
slip_flushbuf(slipfd);
if(ipa_enable) sigalarm_reset();
}
/* Optional delay between outgoing packets */
/* Base delay times number of 6lowpan fragments to be sent */
if(delaymsec) {
struct timeval tv;
int dmsec;
gettimeofday(&tv, NULL) ;
dmsec=(tv.tv_sec-delaystartsec)*1000+tv.tv_usec/1000-delaystartmsec;
if(dmsec<0) delaymsec=0;
if(dmsec>delaymsec) delaymsec=0;
}
if(delaymsec==0) {
int size;
if(slip_empty() && FD_ISSET(tunfd, &rset)) {
size=tun_to_serial(tunfd, slipfd);
slip_flushbuf(slipfd);
if(ipa_enable) sigalarm_reset();
if(basedelay) {
struct timeval tv;
gettimeofday(&tv, NULL) ;
// delaymsec=basedelay*(1+(size/120));//multiply by # of 6lowpan packets?
delaymsec=basedelay;
delaystartsec =tv.tv_sec;
delaystartmsec=tv.tv_usec/1000;
}
}
}
}
}
}
static int net_driver_slip_send(struct net_buf *buf)
{
NET_DBG("Sending %d bytes\n", buf->len);
return slip_send(buf);
}
int
main(int argc, char **argv)
{
int c;
int tunfd, slipfd, maxfd;
int ret;
fd_set rset, wset;
FILE *inslip;
const char *siodev = NULL;
int baudrate = -2;
request_mac = 1;
setvbuf(stdout, NULL, _IOLBF, 0); /* Line buffered output. */
while((c = getopt(argc, argv, "B:D:hs:t:")) != -1) {
switch (c) {
case 'B':
baudrate = atoi(optarg);
break;
case 's':
if(strncmp("/dev/", optarg, 5) == 0) {
siodev = optarg + 5;
} else {
siodev = optarg;
}
break;
case 't':
if(strncmp("/dev/", optarg, 5) == 0) {
strcpy(tundev, optarg + 5);
} else {
strcpy(tundev, optarg);
}
break;
case '?':
case 'h':
default:
errx(1, USAGE_STRING);
break;
}
}
argc -= (optind - 1);
argv += (optind - 1);
if(argc != 3 && argc != 4) {
errx(1, USAGE_STRING);
}
ipaddr = argv[1];
netmask = argv[2];
circuit_addr = inet_addr(ipaddr);
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;
}
if(siodev != NULL) {
slipfd = devopen(siodev, O_RDWR | O_NONBLOCK);
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);
printf("opening: %s", 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);
/* request mac address from gateway node for autoconfiguration of
ethernet interface tap0 */
if (request_mac) {
slip_send(slipfd, '?');
slip_send(slipfd, 'M');
slip_send(slipfd, SLIP_END);
request_mac = 0;
}
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;
}
ret = select(maxfd + 1, &rset, &wset, NULL, NULL);
if(ret == -1 && errno != EINTR) {
err(1, "select");
} else if(ret > 0) {
if(FD_ISSET(slipfd, &rset)) {
serial_to_tun(inslip, tunfd);
}
if(FD_ISSET(slipfd, &wset)) {
slip_flushbuf(slipfd);
sigalarm_reset();
}
if(slip_empty() && FD_ISSET(tunfd, &rset)) {
tun_to_serial(tunfd, slipfd);
slip_flushbuf(slipfd);
sigalarm_reset();
}
}
}
}
int
main(int argc, char **argv)
{
int c;
int tunfd, 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;
ip_id = getpid() * time(NULL);
setvbuf(stdout, NULL, _IOLBF, 0); /* Line buffered output. */
while ((c = getopt(argc, argv, "B:D:hs: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;
case 't':
if (strncmp("/dev/", optarg, 5) == 0) {
strcpy(tundev, optarg + 5);
}
else {
strcpy(tundev, optarg);
}
break;
case '?':
case 'h':
default:
err(1, "usage: tunslip [-B baudrate] [-s siodev] [-t tundev] [-D dhcp-server] ipaddress netmask [dhcp-server]");
break;
}
}
argc -= (optind - 1);
argv += (optind - 1);
if (argc != 3 && argc != 4) {
err(1, "usage: tunslip [-s siodev] [-t tundev] [-D dhcp-server] ipaddress netmask [dhcp-server]");
}
ipaddr = argv[1];
netmask = argv[2];
circuit_addr = inet_addr(ipaddr);
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 (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);
}
if (siodev != NULL) {
slipfd = devopen(siodev, O_RDWR | O_NONBLOCK);
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;
}
}
}
ret = select(maxfd + 1, &rset, &wset, NULL, NULL);
if (ret == -1 && errno != EINTR) {
err(1, "select");
}
else if (ret > 0) {
if (FD_ISSET(slipfd, &rset)) {
serial_to_tun(inslip, tunfd);
}
if (FD_ISSET(slipfd, &wset)) {
slip_flushbuf(slipfd);
sigalarm_reset();
}
if (slip_empty() && FD_ISSET(tunfd, &rset)) {
tun_to_serial(tunfd, slipfd);
slip_flushbuf(slipfd);
sigalarm_reset();
}
if (dhsock != -1 && slip_empty() && FD_ISSET(dhsock, &rset)) {
relay_dhcp_to_client(slipfd);
slip_flushbuf(slipfd);
}
}
}
}
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, "tun_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, "tun_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);
PROGRESS("t");
}
/*---------------------------------------------------------------------------*/
void
slip_init(void)
{
setvbuf(stdout, NULL, _IOLBF, 0); /* Line buffered output. */
if(slip_config_host != NULL) {
if(slip_config_port == NULL) {
slip_config_port = "60001";
}
slipfd = connect_to_server(slip_config_host, slip_config_port);
if(slipfd == -1) {
LOG6LBR_FATAL("can't connect to %s:%s\n", slip_config_host,
slip_config_port);
exit(1);
}
} else if(slip_config_siodev != NULL) {
if(strcmp(slip_config_siodev, "null") == 0) {
/* Disable slip */
return;
}
slipfd = devopen(slip_config_siodev, O_RDWR | O_NONBLOCK);
if(slipfd == -1) {
LOG6LBR_FATAL( "can't open siodev /dev/%s : %s\n", slip_config_siodev, strerror(errno));
exit(1);
}
} else {
static const char *siodevs[] = {
"ttyUSB0", "cuaU0", "ucom0" /* linux, fbsd6, fbsd5 */
};
int i;
for(i = 0; i < 3; i++) {
slip_config_siodev = siodevs[i];
slipfd = devopen(slip_config_siodev, O_RDWR | O_NONBLOCK);
if(slipfd != -1) {
break;
}
}
if(slipfd == -1) {
LOG6LBR_FATAL("can't open siodev : %s\n", strerror(errno));
exit(1);
}
}
select_set_callback(slipfd, &slip_callback);
if(slip_config_host != NULL) {
LOG6LBR_INFO("SLIP opened to %s:%s\n", slip_config_host,
slip_config_port);
} else {
LOG6LBR_INFO("SLIP started on /dev/%s\n", slip_config_siodev);
stty_telos(slipfd);
}
timer_set(&send_delay_timer, 0);
slip_send(slipfd, SLIP_END);
inslip = fdopen(slipfd, "r");
if(inslip == NULL) {
LOG6LBR_FATAL("main: fdopen: %s\n", strerror(errno));
exit(1);
}
}