Initial revision
diff --git a/ggsn/ggsn.c b/ggsn/ggsn.c
new file mode 100644
index 0000000..a850de8
--- /dev/null
+++ b/ggsn/ggsn.c
@@ -0,0 +1,424 @@
+/*
+ * OpenGGSN - Gateway GPRS Support Node
+ * Copyright (C) 2002 Mondru AB.
+ *
+ * The contents of this file may be used under the terms of the GNU
+ * General Public License Version 2, provided that the above copyright
+ * notice and this permission notice is included in all copies or
+ * substantial portions of the software.
+ *
+ * The initial developer of the original code is
+ * Jens Jakobsen <jj@openggsn.org>
+ *
+ * Contributor(s):
+ *
+ */
+
+/* ggsn.c
+ *
+ */
+
+#ifdef __linux__
+#define _GNU_SOURCE 1 /* strdup() prototype, broken arpa/inet.h */
+#endif
+
+
+#include <syslog.h>
+#include <ctype.h>
+#include <netdb.h>
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <features.h>
+
+#include <errno.h>
+
+#include <asm/types.h>
+#include <sys/socket.h>
+#include <linux/netlink.h>
+
+#include <time.h>
+
+#include "tun.h"
+#include "../gtp/pdp.h"
+#include "../gtp/gtp.h"
+#include "cmdline.h"
+
+
+int maxfd = 0; /* For select() */
+int tun_fd = -1; /* Network file descriptor */
+struct tun_t *tun; /* TUN instance */
+struct in_addr net, mask; /* Network interface */
+int debug; /* Print debug output */
+
+
+/* Used to write process ID to file. Assume someone else will delete */
+void log_pid(char *pidfile) {
+ FILE *file;
+ mode_t oldmask;
+
+ oldmask = umask(022);
+ file = fopen(pidfile, "w");
+ umask(oldmask);
+ if(!file)
+ return;
+ fprintf(file, "%d\n", getpid());
+ fclose(file);
+}
+
+
+int encaps_printf(void *p, void *packet, unsigned len)
+{
+ int i;
+ if (debug) {
+ printf("The packet looks like this:\n");
+ for( i=0; i<len; i++) {
+ printf("%02x ", (unsigned char)*(char *)(packet+i));
+ if (!((i+1)%16)) printf("\n");
+ };
+ printf("\n");
+ }
+ return 0;
+}
+
+int getip(struct pdp_t *pdp, void* ipif, struct ul66_t *eua,
+ struct in_addr *net, struct in_addr *mask) {
+ struct in_addr addr;
+ uint32_t ip_start, ip_end, ip_cur;
+ struct pdp_t *pdp_;
+ struct ul66_t eua_;
+
+ if (debug) {
+ printf("Begin getip %d %d %2x%2x%2x%2x\n", (unsigned)ipif, eua->l,
+ eua->v[2],eua->v[3],eua->v[4],eua->v[5]);
+ }
+
+ ip_start = ntoh32(net->s_addr & mask->s_addr);
+ ip_end = ntoh32(hton32(ip_start) | ~mask->s_addr);
+
+ /* By convention the first address is the network address, and the last */
+ /* address is the broadcast address. This way two IP addresses are "lost" */
+ ip_start++;
+
+ if (eua->l == 0) { /* No address supplied. Find one that is available! */
+ /* This routine does linear search. In order to support millions of
+ * addresses we should instead keep a linked list of available adresses */
+ for (ip_cur = ip_start; ip_cur < ip_end; ip_cur++) {
+ addr.s_addr = hton32(ip_cur);
+ pdp_ntoeua(&addr, &eua_);
+ if (pdp_ipget(&pdp_, ipif, &eua_) == -1) {
+ pdp_ntoeua(&addr, &pdp->eua);
+ pdp->ipif = ipif;
+ return 0;
+ };
+ }
+ return EOF; /* No addresses available */
+ }
+ else { /* Address supplied */
+ if (pdp_ipget(&pdp_, ipif, eua) == -1) {
+ pdp->ipif = ipif;
+ pdp->eua.l = eua->l;
+ memcpy(pdp->eua.v, eua->v, eua->l);
+ return 0;
+ }
+ else return EOF; /* Specified address not available */
+ }
+}
+
+
+int delete_context(struct pdp_t *pdp) {
+ pdp_ipdel(pdp);
+ return 0;
+}
+
+
+
+int create_context(struct pdp_t *pdp) {
+
+ if (debug) printf("Received create PDP context request\n");
+
+ pdp->eua.l=0; /* TODO: Indicates dynamic IP */
+
+ /* ulcpy(&pdp->qos_neg, &pdp->qos_req, sizeof(pdp->qos_req.v)); */
+ memcpy(pdp->qos_neg0, pdp->qos_req0, sizeof(pdp->qos_neg));
+
+ getip(pdp, tun, &pdp->eua, &net, &mask);
+ pdp_ipset(pdp, pdp->ipif, &pdp->eua);
+
+ return 0; /* Success */
+}
+
+
+
+int create_tun() {
+ char buf[1024];
+ char snet[100], smask[100];
+
+ if ((tun_fd = tun_newtun((struct tun_t**) &tun)) > maxfd)
+ maxfd = tun_fd;
+
+ if (tun_fd == -1) {
+ printf("Failed to open tun\n");
+ exit(1);
+ }
+
+ strncpy(snet, inet_ntoa(net), 100);
+ strncpy(smask, inet_ntoa(mask), 100);
+
+ sprintf(buf, "ifconfig %s %s mtu 1450 netmask %s",
+ tun->devname, snet, smask);
+ if (debug) printf("%s\n", buf);
+ system(buf);
+
+ system("echo 1 > /proc/sys/net/ipv4/ip_forward");
+
+ return 0;
+}
+
+
+int encaps_gtp(void *gsn, struct tun_t *tun, void *pack, unsigned len) {
+ struct pdp_t *pdp;
+ struct in_addr addr;
+ struct ul66_t eua;
+ /*printf("encaps_gtp. Packet received: forwarding to gtp.\n");*/
+ /* First we need to extract the IP destination address */
+ memcpy(&addr.s_addr, pack+16, 4); /* This ought to be dest addr */
+ pdp_ntoeua(&addr, &eua);
+ if (pdp_ipget(&pdp, tun, &eua) == 0) {
+ return gtp_gpdu((struct gsn_t*) gsn, pdp, pack, len);
+ }
+ else {
+ if (debug) printf("Received packet with no destination!!!\n");
+ return 0;
+ }
+}
+
+
+int encaps_tun(struct pdp_t *pdp, void *pack, unsigned len) {
+ /* printf("encaps_tun. Packet received: forwarding to tun\n");*/
+ return tun_encaps((struct tun_t*) pdp->ipif, pack, len);
+}
+
+
+int main(int argc, char **argv)
+{
+ /* gengeopt declarations */
+ struct gengetopt_args_info args_info;
+
+ struct hostent *host;
+
+ struct in_addr listen;
+
+ int gtpfd = -1; /* Network file descriptor */
+ struct gsn_t *gsn; /* GSN instance */
+
+ fd_set fds; /* For select() */
+ struct timeval idleTime; /* How long to select() */
+ int i; /* for loop */
+
+ struct ul_t qos, apn;
+ unsigned char qosh[3], apnh[256];
+
+ 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);*/
+ openlog(PACKAGE, (LOG_PID | LOG_PERROR), LOG_DAEMON);
+
+ if (cmdline_parser (argc, argv, &args_info) != 0)
+ exit(1);
+ if (args_info.debug_flag) {
+ 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);
+ printf("apn: %s\n", args_info.apn_arg);
+ printf("net: %s\n", args_info.net_arg);
+ printf("mask: %s\n", args_info.mask_arg);
+ printf("pidfile: %s\n", args_info.pidfile_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)
+ 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);
+ printf("apn: %s\n", args_info.apn_arg);
+ printf("net: %s\n", args_info.net_arg);
+ printf("mask: %s\n", args_info.mask_arg);
+ printf("pidfile: %s\n", args_info.pidfile_arg);
+ printf("statedir: %s\n", args_info.statedir_arg);
+ printf("timelimit: %d\n", args_info.timelimit_arg);
+ }
+
+ /* Handle each option */
+
+ /* 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);
+ }
+
+ /* debug */
+ debug = args_info.debug_flag;
+
+ /* pidfile */
+ /* This has to be done after we have our final pid */
+ if (args_info.pidfile_arg) {
+ log_pid(args_info.pidfile_arg);
+ }
+
+ /* listen */
+ /* If no listen option is specified listen to any local port */
+ /* Do hostname lookup to translate hostname to IP address */
+ if (args_info.listen_arg) {
+ if (!(host = gethostbyname(args_info.listen_arg))) {
+ fprintf(stderr, "%s: Invalid listening address: %s!\n",
+ PACKAGE, args_info.listen_arg);
+ syslog(LOG_ERR, "Invalid listening address: %s!",
+ args_info.listen_arg);
+ return 1;
+ }
+ else {
+ memcpy(&listen.s_addr, host->h_addr, host->h_length);
+ }
+ }
+ else {
+ listen.s_addr = htonl(INADDR_ANY);
+ }
+
+ /* net */
+ /* Store net as in_addr */
+ if (args_info.net_arg) {
+ if (!inet_aton(args_info.net_arg, &net)) {
+ fprintf(stderr, "%s: Invalid network address: %s!\n",
+ PACKAGE, args_info.net_arg);
+ syslog(LOG_ERR, "Invalid network address: %s!",
+ args_info.net_arg);
+ return 1;
+ }
+ }
+
+ /* mask */
+ /* Store mask as in_addr */
+ if (args_info.mask_arg) {
+ if (!inet_aton(args_info.mask_arg, &mask)) {
+ fprintf(stderr, "%s: Invalid network mask: %s!\n",
+ PACKAGE, args_info.mask_arg);
+ syslog(LOG_ERR, "Invalid network mask: %s!",
+ args_info.mask_arg);
+ return 1;
+ }
+ }
+
+ /* Timelimit */
+ timelimit = args_info.timelimit_arg;
+ starttime = time(NULL);
+
+ /* qos */
+ qos.l = 3;
+ qos.v = qosh;
+ 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)>255) {
+ printf("invalid APN\n");
+ exit(1);
+ }
+ apn.l = strlen(args_info.apn_arg) + 1;
+ apn.v = apnh;
+ apn.v[0] = (char) strlen(args_info.apn_arg);
+ strncpy(&apn.v[1], args_info.apn_arg, 255);
+
+ if (debug) printf("gtpclient: Initialising GTP tunnel\n");
+
+ if ((gtpfd = gtp_new(&gsn, args_info.statedir_arg, &listen)) > maxfd)
+ maxfd = gtpfd;
+
+ if ((gtpfd = gtp_fd(gsn)) > maxfd)
+ maxfd = gtpfd;
+
+
+ gtp_set_cb_gpdu(gsn, encaps_tun);
+ gtp_set_cb_delete_context(gsn, delete_context);
+
+ gtp_set_cb_create_context(gsn, create_context);
+ create_tun();
+
+ /******************************************************************/
+ /* Main select loop */
+ /******************************************************************/
+
+ while (((starttime + timelimit) > time(NULL)) || (0 == timelimit)) {
+
+ FD_ZERO(&fds);
+ if (tun_fd != -1) FD_SET(tun_fd, &fds);
+ if (gtpfd != -1) FD_SET(gtpfd, &fds);
+
+ gtp_retranstimeout(gsn, &idleTime);
+ switch (select(maxfd + 1, &fds, NULL, NULL, &idleTime)) {
+ case -1: /* Error with select() *
+ if (errno != EINTR)
+ syslog(LOG_ERR, "CTRL: Error with select(), quitting");
+ *goto leave_clear_call;*/
+ syslog(LOG_ERR, "GGSN: select = -1");
+ break;
+ case 0:
+ gtp_retrans(gsn); /* Only retransmit if nothing else */
+ break;
+ default:
+ break;
+ }
+
+ if (tun_fd != -1 && FD_ISSET(tun_fd, &fds) &&
+ tun_decaps(tun, encaps_gtp, gsn) < 0) {
+ syslog(LOG_ERR, "TUN read failed (fd)=(%d)", tun_fd);
+ }
+
+ if (gtpfd != -1 && FD_ISSET(gtpfd, &fds) &&
+ gtp_decaps(gsn) < 0) {
+ syslog(LOG_ERR, "GTP read failed (gre)=(%d)", gtpfd);
+ }
+
+
+ }
+
+ gtp_free(gsn);
+
+ return 1;
+
+}
+