/* libgtp select loop integration */
static int sgsn_gtp_fd_cb(struct osmo_fd *fd, unsigned int what)
{
struct sgsn_instance *sgi = fd->data;
int rc;
if (!(what & BSC_FD_READ))
return 0;
switch (fd->priv_nr) {
case 0:
rc = gtp_decaps0(sgi->gsn);
break;
case 1:
rc = gtp_decaps1c(sgi->gsn);
break;
case 2:
rc = gtp_decaps1u(sgi->gsn);
break;
default:
rc = -EINVAL;
break;
}
return rc;
}
int main(int argc, char **argv)
{
/* gengeopt declarations */
struct gengetopt_args_info args_info;
struct hostent *host;
/* Handle keyboard interrupt SIGINT */
struct sigaction s;
s.sa_handler = (void *) signal_handler;
if ((0 != sigemptyset( &s.sa_mask )) && debug)
printf("sigemptyset failed.\n");
s.sa_flags = SA_RESETHAND;
if ((sigaction(SIGINT, &s, NULL) != 0) && debug)
printf("Could not register SIGINT signal handler.\n");
fd_set fds; /* For select() */
struct timeval idleTime; /* How long to select() */
int timelimit; /* Number of seconds to be connected */
int starttime; /* Time program was started */
/* open a connection to the syslog daemon */
/*openlog(PACKAGE, LOG_PID, LOG_DAEMON);*/
/* TODO: Only use LOG__PERROR for linux */
#ifdef __linux__
openlog(PACKAGE, (LOG_PID | LOG_PERROR), LOG_DAEMON);
#else
openlog(PACKAGE, (LOG_PID), LOG_DAEMON);
#endif
if (cmdline_parser (argc, argv, &args_info) != 0)
exit(1);
if (args_info.debug_flag) {
printf("listen: %s\n", args_info.listen_arg);
if (args_info.conf_arg) printf("conf: %s\n", args_info.conf_arg);
printf("fg: %d\n", args_info.fg_flag);
printf("debug: %d\n", args_info.debug_flag);
printf("qos: %#08x\n", args_info.qos_arg);
if (args_info.apn_arg) printf("apn: %s\n", args_info.apn_arg);
if (args_info.net_arg) printf("net: %s\n", args_info.net_arg);
if (args_info.dynip_arg) printf("dynip: %s\n", args_info.dynip_arg);
if (args_info.statip_arg) printf("statip: %s\n", args_info.statip_arg);
if (args_info.ipup_arg) printf("ipup: %s\n", args_info.ipup_arg);
if (args_info.ipdown_arg) printf("ipdown: %s\n", args_info.ipdown_arg);
if (args_info.pidfile_arg) printf("pidfile: %s\n", args_info.pidfile_arg);
if (args_info.statedir_arg) printf("statedir: %s\n", args_info.statedir_arg);
printf("timelimit: %d\n", args_info.timelimit_arg);
}
/* Try out our new parser */
if (cmdline_parser_configfile (args_info.conf_arg, &args_info, 0, 0, 0) != 0)
exit(1);
if (args_info.debug_flag) {
printf("cmdline_parser_configfile\n");
printf("listen: %s\n", args_info.listen_arg);
printf("conf: %s\n", args_info.conf_arg);
printf("fg: %d\n", args_info.fg_flag);
printf("debug: %d\n", args_info.debug_flag);
printf("qos: %#08x\n", args_info.qos_arg);
if (args_info.apn_arg) printf("apn: %s\n", args_info.apn_arg);
if (args_info.net_arg) printf("net: %s\n", args_info.net_arg);
if (args_info.dynip_arg) printf("dynip: %s\n", args_info.dynip_arg);
if (args_info.statip_arg) printf("statip: %s\n", args_info.statip_arg);
if (args_info.ipup_arg) printf("ipup: %s\n", args_info.ipup_arg);
if (args_info.ipdown_arg) printf("ipdown: %s\n", args_info.ipdown_arg);
if (args_info.pidfile_arg) printf("pidfile: %s\n", args_info.pidfile_arg);
if (args_info.statedir_arg) printf("statedir: %s\n", args_info.statedir_arg);
printf("timelimit: %d\n", args_info.timelimit_arg);
}
/* Handle each option */
/* debug */
debug = args_info.debug_flag;
/* listen */
/* Do hostname lookup to translate hostname to IP address */
/* Any port listening is not possible as a valid address is */
/* required for create_pdp_context_response messages */
if (args_info.listen_arg) {
if (!(host = gethostbyname(args_info.listen_arg))) {
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
"Invalid listening address: %s!", args_info.listen_arg);
exit(1);
}
else {
memcpy(&listen_.s_addr, host->h_addr, host->h_length);
}
}
else {
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
"Listening address must be specified! "
"Please use command line option --listen or "
"edit %s configuration file\n", args_info.conf_arg);
exit(1);
}
/* net */
/* Store net as in_addr net and mask */
if (args_info.net_arg) {
if(ippool_aton(&net, &mask, args_info.net_arg, 0)) {
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
"Invalid network address: %s!", args_info.net_arg);
exit(1);
}
netaddr.s_addr = htonl(ntohl(net.s_addr) + 1);
destaddr.s_addr = htonl(ntohl(net.s_addr) + 1);
}
else {
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
"Network address must be specified: %s!", args_info.net_arg);
exit(1);
}
/* dynip */
if (!args_info.dynip_arg) {
if (ippool_new(&ippool, args_info.net_arg, NULL, 1, 0,
IPPOOL_NONETWORK | IPPOOL_NOGATEWAY | IPPOOL_NOBROADCAST)) {
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
"Failed to allocate IP pool!");
exit(1);
}
}
else {
if (ippool_new(&ippool, args_info.dynip_arg, NULL, 1 ,0,
IPPOOL_NONETWORK | IPPOOL_NOGATEWAY | IPPOOL_NOBROADCAST)) {
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
"Failed to allocate IP pool!");
exit(1);
}
}
/* DNS1 and DNS2 */
#ifdef HAVE_INET_ATON
dns1.s_addr = 0;
if (args_info.pcodns1_arg) {
if (0 == inet_aton(args_info.pcodns1_arg, &dns1)) {
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
"Failed to convert pcodns1!");
exit(1);
}
}
dns2.s_addr = 0;
if (args_info.pcodns2_arg) {
if (0 == inet_aton(args_info.pcodns2_arg, &dns2)) {
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
"Failed to convert pcodns2!");
exit(1);
}
}
#else
dns1.s_addr = 0;
if (args_info.pcodns1_arg) {
dns1.s_addr = inet_addr(args_info.pcodns1_arg);
if (dns1.s_addr == -1) {
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
"Failed to convert pcodns1!");
exit(1);
}
}
dns2.s_addr = 0;
if (args_info.pcodns2_arg) {
dns2.s_addr = inet_addr(args_info.pcodns2_arg);
if (dns2.s_addr == -1) {
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
"Failed to convert pcodns2!");
exit(1);
}
}
#endif
pco.l = 20;
pco.v[0] = 0x80; /* x0000yyy x=1, yyy=000: PPP */
pco.v[1] = 0x80; /* IPCP */
pco.v[2] = 0x21;
pco.v[3] = 0x10; /* Length of contents */
pco.v[4] = 0x02; /* ACK */
pco.v[5] = 0x00; /* ID: Need to match request */
pco.v[6] = 0x00; /* Length */
pco.v[7] = 0x10;
pco.v[8] = 0x81; /* DNS 1 */
pco.v[9] = 0x06;
memcpy(&pco.v[10], &dns1, sizeof(dns1));
pco.v[14] = 0x83;
pco.v[15] = 0x06; /* DNS 2 */
memcpy(&pco.v[16], &dns2, sizeof(dns2));
/* ipup */
ipup = args_info.ipup_arg;
/* ipdown */
ipdown = args_info.ipdown_arg;
/* Timelimit */
timelimit = args_info.timelimit_arg;
starttime = time(NULL);
/* qos */
qos.l = 3;
qos.v[2] = (args_info.qos_arg) & 0xff;
qos.v[1] = ((args_info.qos_arg) >> 8) & 0xff;
qos.v[0] = ((args_info.qos_arg) >> 16) & 0xff;
/* apn */
if (strlen(args_info.apn_arg) > (sizeof(apn.v)-1)) {
printf("Invalid APN\n");
return -1;
}
apn.l = strlen(args_info.apn_arg) + 1;
apn.v[0] = (char) strlen(args_info.apn_arg);
strncpy((char *) &apn.v[1], args_info.apn_arg, sizeof(apn.v)-1);
/* foreground */
/* If flag not given run as a daemon */
if (!args_info.fg_flag)
{
closelog();
/* Close the standard file descriptors. */
/* Is this really needed ? */
freopen("/dev/null", "w", stdout);
freopen("/dev/null", "w", stderr);
freopen("/dev/null", "r", stdin);
daemon(0, 0);
/* Open log again. This time with new pid */
openlog(PACKAGE, LOG_PID, LOG_DAEMON);
}
/* pidfile */
/* This has to be done after we have our final pid */
if (args_info.pidfile_arg) {
log_pid(args_info.pidfile_arg);
}
if (debug) printf("gtpclient: Initialising GTP tunnel\n");
if (gtp_new(&gsn, args_info.statedir_arg, &listen_, GTP_MODE_GGSN)) {
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
"Failed to create gtp");
exit(1);
}
if (gsn->fd0 > maxfd) maxfd = gsn->fd0;
if (gsn->fd1c > maxfd) maxfd = gsn->fd1c;
if (gsn->fd1u > maxfd) maxfd = gsn->fd1u;
gtp_set_cb_data_ind(gsn, encaps_tun);
gtp_set_cb_delete_context(gsn, delete_context);
gtp_set_cb_create_context_ind(gsn, create_context_ind);
/* Create a tunnel interface */
if (debug) printf("Creating tun interface\n");
if (tun_new((struct tun_t**) &tun)) {
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
"Failed to create tun");
if (debug) printf("Failed to create tun\n");
exit(1);
}
if (debug) printf("Setting tun IP address\n");
if (tun_setaddr(tun, &netaddr, &destaddr, &mask)) {
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
"Failed to set tun IP address");
if (debug) printf("Failed to set tun IP address\n");
exit(1);
}
tun_set_cb_ind(tun, cb_tun_ind);
if (tun->fd > maxfd) maxfd = tun->fd;
if (ipup) tun_runscript(tun, ipup);
/******************************************************************/
/* Main select loop */
/******************************************************************/
while ((((starttime + timelimit) > time(NULL)) || (0 == timelimit)) && (!end)) {
FD_ZERO(&fds);
if (tun) FD_SET(tun->fd, &fds);
FD_SET(gsn->fd0, &fds);
FD_SET(gsn->fd1c, &fds);
FD_SET(gsn->fd1u, &fds);
gtp_retranstimeout(gsn, &idleTime);
switch (select(maxfd + 1, &fds, NULL, NULL, &idleTime)) {
case -1: /* errno == EINTR : unblocked signal */
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
"select() returned -1");
/* On error, select returns without modifying fds */
FD_ZERO(&fds);
break;
case 0:
/* printf("Select returned 0\n"); */
gtp_retrans(gsn); /* Only retransmit if nothing else */
break;
default:
break;
}
if (tun->fd != -1 && FD_ISSET(tun->fd, &fds) &&
tun_decaps(tun) < 0) {
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
"TUN read failed (fd)=(%d)", tun->fd);
}
if (FD_ISSET(gsn->fd0, &fds))
gtp_decaps0(gsn);
if (FD_ISSET(gsn->fd1c, &fds))
gtp_decaps1c(gsn);
if (FD_ISSET(gsn->fd1u, &fds))
gtp_decaps1u(gsn);
}
cmdline_parser_free(&args_info);
ippool_free(ippool);
gtp_free(gsn);
tun_free(tun);
return 1;
}