1271 lines
36 KiB
C
1271 lines
36 KiB
C
/*
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* OpenGGSN - Gateway GPRS Support Node
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* Copyright (C) 2002, 2003 Mondru AB.
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*
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* The contents of this file may be used under the terms of the GNU
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* General Public License Version 2, provided that the above copyright
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* notice and this permission notice is included in all copies or
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* substantial portions of the software.
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*
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* The initial developer of the original code is
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* Jens Jakobsen <jj@openggsn.org>
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*
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* Contributor(s):
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*
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*/
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/*
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* sgsnemu.c
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*
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*/
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#ifdef __linux__
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#define _GNU_SOURCE 1 /* strdup() prototype, broken arpa/inet.h */
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#endif
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#include <syslog.h>
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#include <ctype.h>
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#include <netdb.h>
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#include <signal.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <net/if.h>
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#include <errno.h>
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#include <sys/socket.h>
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#include <resolv.h>
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#include <time.h>
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#include "tun.h"
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#include "ippool.h"
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#include "syserr.h"
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#include "../gtp/pdp.h"
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#include "../gtp/gtp.h"
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#include "cmdline.h"
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#define IPADDRLEN 256 /* Character length of addresses */
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#define MAXCONTEXTS 1024 /* Max number of allowed contexts */
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/* HASH tables for IP address allocation */
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struct iphash_t {
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uint8_t inuse; /* 0=free. 1=used by somebody */
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struct iphash_t *ipnext;
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struct pdp_t *pdp;
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struct in_addr addr;
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};
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struct iphash_t iparr[MAXCONTEXTS];
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struct iphash_t *iphash[MAXCONTEXTS];
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/* State variable used for ping */
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/* 0: Idle */
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/* 1: Wait_connect */
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/* 2: Connected */
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/* 3: Done */
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/* 4: Wait_disconnect */
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/* 5: Disconnected */
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int state = 0;
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struct gsn_t *gsn = NULL; /* GSN instance */
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struct tun_t *tun = NULL; /* TUN instance */
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int maxfd = 0; /* For select() */
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int echoversion = 1; /* First try this version */
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/* Struct with local versions of gengetopt options */
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struct {
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int debug; /* Print debug messages */
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int createif; /* Create local network interface */
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struct in_addr net, mask; /* Network interface */
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char *ipup, *ipdown; /* Filename of scripts */
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int defaultroute; /* Set up default route */
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struct in_addr pinghost; /* Remote ping host */
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int pingrate;
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int pingsize;
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int pingcount;
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int pingquiet;
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struct in_addr listen;
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struct in_addr remote;
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struct in_addr dns;
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int contexts; /* Number of contexts to create */
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int timelimit; /* Number of seconds to be connected */
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char *statedir;
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uint64_t imsi;
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uint8_t nsapi;
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int gtpversion;
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struct ul255_t pco;
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struct ul255_t qos;
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struct ul255_t apn;
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struct ul16_t msisdn;
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} options;
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/* Definitions to use for PING. Most of the ping code was derived from */
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/* the original ping program by Mike Muuss */
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/* IP header and ICMP echo header */
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#define CREATEPING_MAX 2048
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#define CREATEPING_IP 20
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#define CREATEPING_ICMP 8
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struct ip_ping {
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uint8_t ipver; /* Type and header length*/
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uint8_t tos; /* Type of Service */
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uint16_t length; /* Total length */
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uint16_t fragid; /* Identifier */
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uint16_t offset; /* Flags and fragment offset */
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uint8_t ttl; /* Time to live */
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uint8_t protocol; /* Protocol */
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uint16_t ipcheck; /* Header checksum */
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uint32_t src; /* Source address */
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uint32_t dst; /* Destination */
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uint8_t type; /* Type and header length*/
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uint8_t code; /* Code */
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uint16_t checksum; /* Header checksum */
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uint16_t ident; /* Identifier */
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uint16_t seq; /* Sequence number */
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uint8_t data[CREATEPING_MAX]; /* Data */
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} __attribute__((packed));
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/* Statistical values for ping */
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int nreceived = 0;
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int ntreceived = 0;
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int ntransmitted = 0;
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int tmin = 999999999;
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int tmax = 0;
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int tsum = 0;
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int pingseq = 0; /* Ping sequence counter */
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struct timeval firstping;
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int ipset(struct iphash_t *ipaddr, struct in_addr *addr) {
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int hash = ippool_hash4(addr) % MAXCONTEXTS;
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struct iphash_t *h;
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struct iphash_t *prev = NULL;
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ipaddr->ipnext = NULL;
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ipaddr->addr.s_addr = addr->s_addr;
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for (h = iphash[hash]; h; h = h->ipnext)
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prev = h;
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if (!prev)
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iphash[hash] = ipaddr;
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else
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prev->ipnext = ipaddr;
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return 0;
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}
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int ipdel(struct iphash_t *ipaddr) {
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int hash = ippool_hash4(&ipaddr->addr) % MAXCONTEXTS;
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struct iphash_t *h;
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struct iphash_t *prev = NULL;
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for (h = iphash[hash]; h; h = h->ipnext) {
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if (h == ipaddr) {
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if (!prev)
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iphash[hash] = h->ipnext;
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else
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prev->ipnext = h->ipnext;
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return 0;
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}
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prev = h;
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}
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return EOF; /* End of linked list and not found */
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}
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int ipget(struct iphash_t **ipaddr, struct in_addr *addr) {
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int hash = ippool_hash4(addr) % MAXCONTEXTS;
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struct iphash_t *h;
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for (h = iphash[hash]; h; h = h->ipnext) {
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if ((h->addr.s_addr == addr->s_addr)) {
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*ipaddr = h;
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return 0;
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}
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}
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return EOF; /* End of linked list and not found */
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}
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/* Used to write process ID to file. Assume someone else will delete */
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void log_pid(char *pidfile) {
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FILE *file;
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mode_t oldmask;
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oldmask = umask(022);
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file = fopen(pidfile, "w");
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umask(oldmask);
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if(!file)
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return;
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fprintf(file, "%d\n", (int) getpid());
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fclose(file);
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}
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int process_options(int argc, char **argv) {
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/* gengeopt declarations */
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struct gengetopt_args_info args_info;
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struct hostent *host;
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int n;
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if (cmdline_parser (argc, argv, &args_info) != 0)
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return -1;
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if (args_info.debug_flag) {
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printf("remote: %s\n", args_info.remote_arg);
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printf("listen: %s\n", args_info.listen_arg);
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printf("conf: %s\n", args_info.conf_arg);
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printf("debug: %d\n", args_info.debug_flag);
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printf("imsi: %s\n", args_info.imsi_arg);
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printf("qos: %#08x\n", args_info.qos_arg);
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printf("apn: %s\n", args_info.apn_arg);
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printf("msisdn: %s\n", args_info.msisdn_arg);
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printf("uid: %s\n", args_info.uid_arg);
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printf("pwd: %s\n", args_info.pwd_arg);
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printf("pidfile: %s\n", args_info.pidfile_arg);
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printf("statedir: %s\n", args_info.statedir_arg);
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printf("dns: %s\n", args_info.dns_arg);
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printf("contexts: %d\n", args_info.contexts_arg);
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printf("timelimit: %d\n", args_info.timelimit_arg);
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printf("createif: %d\n", args_info.createif_flag);
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printf("ipup: %s\n", args_info.ipup_arg);
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printf("ipdown: %s\n", args_info.ipdown_arg);
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printf("defaultroute: %d\n", args_info.defaultroute_flag);
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printf("pinghost: %s\n", args_info.pinghost_arg);
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printf("pingrate: %d\n", args_info.pingrate_arg);
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printf("pingsize: %d\n", args_info.pingsize_arg);
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printf("pingcount: %d\n", args_info.pingcount_arg);
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printf("pingquiet: %d\n", args_info.pingquiet_flag);
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}
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/* Try out our new parser */
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if (args_info.conf_arg) {
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if (cmdline_parser_configfile (args_info.conf_arg, &args_info, 0) != 0)
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return -1;
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if (args_info.debug_flag) {
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printf("cmdline_parser_configfile\n");
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printf("remote: %s\n", args_info.remote_arg);
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printf("listen: %s\n", args_info.listen_arg);
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printf("conf: %s\n", args_info.conf_arg);
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printf("debug: %d\n", args_info.debug_flag);
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printf("imsi: %s\n", args_info.imsi_arg);
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printf("qos: %#08x\n", args_info.qos_arg);
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printf("apn: %s\n", args_info.apn_arg);
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printf("msisdn: %s\n", args_info.msisdn_arg);
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printf("uid: %s\n", args_info.uid_arg);
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printf("pwd: %s\n", args_info.pwd_arg);
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printf("pidfile: %s\n", args_info.pidfile_arg);
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printf("statedir: %s\n", args_info.statedir_arg);
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printf("dns: %s\n", args_info.dns_arg);
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printf("contexts: %d\n", args_info.contexts_arg);
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printf("timelimit: %d\n", args_info.timelimit_arg);
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printf("createif: %d\n", args_info.createif_flag);
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printf("ipup: %s\n", args_info.ipup_arg);
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printf("ipdown: %s\n", args_info.ipdown_arg);
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printf("defaultroute: %d\n", args_info.defaultroute_flag);
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printf("pinghost: %s\n", args_info.pinghost_arg);
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printf("pingrate: %d\n", args_info.pingrate_arg);
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printf("pingsize: %d\n", args_info.pingsize_arg);
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printf("pingcount: %d\n", args_info.pingcount_arg);
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printf("pingquiet: %d\n", args_info.pingquiet_flag);
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}
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}
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/* Handle each option */
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/* foreground */
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/* If fg flag not given run as a daemon */
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/* Do not allow sgsnemu to run as deamon
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if (!args_info.fg_flag)
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{
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closelog();
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freopen("/dev/null", "w", stdout);
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freopen("/dev/null", "w", stderr);
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freopen("/dev/null", "r", stdin);
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daemon(0, 0);
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openlog(PACKAGE, LOG_PID, LOG_DAEMON);
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} */
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/* debug */
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options.debug = args_info.debug_flag;
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/* pidfile */
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/* This has to be done after we have our final pid */
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if (args_info.pidfile_arg) {
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log_pid(args_info.pidfile_arg);
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}
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/* dns */
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/* If no dns option is given use system default */
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/* Do hostname lookup to translate hostname to IP address */
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printf("\n");
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if (args_info.dns_arg) {
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if (!(host = gethostbyname(args_info.dns_arg))) {
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sys_err(LOG_ERR, __FILE__, __LINE__, 0,
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"Invalid DNS address: %s!", args_info.dns_arg);
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return -1;
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}
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else {
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memcpy(&options.dns.s_addr, host->h_addr, host->h_length);
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_res.nscount = 1;
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_res.nsaddr_list[0].sin_addr = options.dns;
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printf("Using DNS server: %s (%s)\n",
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args_info.dns_arg, inet_ntoa(options.dns));
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}
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}
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else {
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options.dns.s_addr= 0;
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printf("Using default DNS server\n");
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}
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/* listen */
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/* If no listen option is specified listen to any local port */
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/* Do hostname lookup to translate hostname to IP address */
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if (args_info.listen_arg) {
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if (!(host = gethostbyname(args_info.listen_arg))) {
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sys_err(LOG_ERR, __FILE__, __LINE__, 0,
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"Invalid listening address: %s!", args_info.listen_arg);
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return -1;
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}
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else {
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memcpy(&options.listen.s_addr, host->h_addr, host->h_length);
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printf("Local IP address is: %s (%s)\n",
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args_info.listen_arg, inet_ntoa(options.listen));
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}
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}
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else {
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sys_err(LOG_ERR, __FILE__, __LINE__, 0,
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"Listening address must be specified: %s!", args_info.listen_arg);
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return -1;
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}
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/* remote */
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/* If no remote option is specified terminate */
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/* Do hostname lookup to translate hostname to IP address */
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if (args_info.remote_arg) {
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if (!(host = gethostbyname(args_info.remote_arg))) {
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sys_err(LOG_ERR, __FILE__, __LINE__, 0,
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"Invalid remote address: %s!", args_info.remote_arg);
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return -1;
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}
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else {
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memcpy(&options.remote.s_addr, host->h_addr, host->h_length);
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printf("Remote IP address is: %s (%s)\n",
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args_info.remote_arg, inet_ntoa(options.remote));
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}
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}
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else {
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sys_err(LOG_ERR, __FILE__, __LINE__, 0,
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"No remote address given!");
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return -1;
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}
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/* imsi */
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if (strlen(args_info.imsi_arg)!=15) {
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printf("Invalid IMSI\n");
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return -1;
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}
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options.imsi = ((uint64_t) (args_info.imsi_arg[ 0]-48));
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options.imsi |= ((uint64_t) (args_info.imsi_arg[ 1]-48)) << 4;
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options.imsi |= ((uint64_t) (args_info.imsi_arg[ 2]-48)) << 8;
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options.imsi |= ((uint64_t) (args_info.imsi_arg[ 3]-48)) << 12;
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options.imsi |= ((uint64_t) (args_info.imsi_arg[ 4]-48)) << 16;
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options.imsi |= ((uint64_t) (args_info.imsi_arg[ 5]-48)) << 20;
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options.imsi |= ((uint64_t) (args_info.imsi_arg[ 6]-48)) << 24;
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options.imsi |= ((uint64_t) (args_info.imsi_arg[ 7]-48)) << 28;
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options.imsi |= ((uint64_t) (args_info.imsi_arg[ 8]-48)) << 32;
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options.imsi |= ((uint64_t) (args_info.imsi_arg[ 9]-48)) << 36;
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options.imsi |= ((uint64_t) (args_info.imsi_arg[10]-48)) << 40;
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options.imsi |= ((uint64_t) (args_info.imsi_arg[11]-48)) << 44;
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options.imsi |= ((uint64_t) (args_info.imsi_arg[12]-48)) << 48;
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options.imsi |= ((uint64_t) (args_info.imsi_arg[13]-48)) << 52;
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options.imsi |= ((uint64_t) (args_info.imsi_arg[14]-48)) << 56;
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printf("IMSI is: %s (%#08llx)\n",
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args_info.imsi_arg, options.imsi);
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/* nsapi */
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if ((args_info.nsapi_arg > 15) ||
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(args_info.nsapi_arg < 0)) {
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printf("Invalid NSAPI\n");
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return -1;
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}
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options.nsapi = args_info.nsapi_arg;
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printf("Using NSAPI: %d\n", args_info.nsapi_arg);
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/* qos */
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options.qos.l = 3;
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options.qos.v[2] = (args_info.qos_arg) & 0xff;
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options.qos.v[1] = ((args_info.qos_arg) >> 8) & 0xff;
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options.qos.v[0] = ((args_info.qos_arg) >> 16) & 0xff;
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/* contexts */
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if (args_info.contexts_arg > MAXCONTEXTS) {
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printf("Contexts has to be less than %d\n", MAXCONTEXTS);
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return -1;
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}
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options.contexts = args_info.contexts_arg;
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/* Timelimit */
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options.timelimit = args_info.timelimit_arg;
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/* gtpversion */
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if ((args_info.gtpversion_arg > 1) ||
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(args_info.gtpversion_arg < 0)) {
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printf("Invalid GTP version\n");
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return -1;
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}
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options.gtpversion = args_info.gtpversion_arg;
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printf("Using GTP version: %d\n", args_info.gtpversion_arg);
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/* apn */
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if (strlen(args_info.apn_arg) > (sizeof(options.apn.v)-1)) {
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printf("Invalid APN\n");
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return -1;
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}
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options.apn.l = strlen(args_info.apn_arg) + 1;
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options.apn.v[0] = (char) strlen(args_info.apn_arg);
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strncpy(&options.apn.v[1], args_info.apn_arg, sizeof(options.apn.v)-1);
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printf("Using APN: %s\n", args_info.apn_arg);
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/* msisdn */
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if (strlen(args_info.msisdn_arg)>(sizeof(options.msisdn.v)-1)) {
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printf("Invalid MSISDN\n");
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return -1;
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}
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options.msisdn.l = 1;
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options.msisdn.v[0] = 0x91; /* International format */
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for(n=0; n<strlen(args_info.msisdn_arg); n++) {
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if ((n%2) == 0) {
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options.msisdn.v[((int)n/2)+1] = args_info.msisdn_arg[n] - 48 + 0xf0;
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options.msisdn.l += 1;
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}
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else {
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options.msisdn.v[((int)n/2)+1] =
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(options.msisdn.v[((int)n/2)+1] & 0x0f) +
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(args_info.msisdn_arg[n] - 48) * 16;
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}
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}
|
|
printf("Using MSISDN: %s\n", args_info.msisdn_arg);
|
|
|
|
/* UID and PWD */
|
|
/* Might need to also insert stuff like DNS etc. */
|
|
if ((strlen(args_info.uid_arg) + strlen(args_info.pwd_arg) + 10)>
|
|
(sizeof(options.pco.v)-1)) {
|
|
printf("invalid UID and PWD\n");
|
|
return -1;
|
|
}
|
|
options.pco.l = strlen(args_info.uid_arg) + strlen(args_info.pwd_arg) + 10;
|
|
options.pco.v[0] = 0x80; /* PPP */
|
|
options.pco.v[1] = 0xc0; /* PAP */
|
|
options.pco.v[2] = 0x23;
|
|
options.pco.v[3] = 0x12; /* Length of protocol contents */
|
|
options.pco.v[4] = 0x01; /* Authenticate request */
|
|
options.pco.v[5] = 0x01;
|
|
options.pco.v[6] = 0x00; /* MSB of length */
|
|
options.pco.v[7] = strlen(args_info.uid_arg) + strlen(args_info.pwd_arg) + 6;
|
|
options.pco.v[8] = strlen(args_info.uid_arg);
|
|
memcpy(&options.pco.v[9], args_info.uid_arg, strlen(args_info.uid_arg));
|
|
options.pco.v[9+strlen(args_info.uid_arg)] = strlen(args_info.pwd_arg);
|
|
memcpy(&options.pco.v[10+strlen(args_info.uid_arg)],
|
|
args_info.pwd_arg, strlen(args_info.pwd_arg));
|
|
|
|
/* createif */
|
|
options.createif = args_info.createif_flag;
|
|
|
|
/* net */
|
|
/* Store net as in_addr net and mask */
|
|
if (args_info.net_arg) {
|
|
if(ippool_aton(&options.net, &options.mask, args_info.net_arg, 0)) {
|
|
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
|
|
"Invalid network address: %s!", args_info.net_arg);
|
|
exit(1);
|
|
}
|
|
}
|
|
else {
|
|
options.net.s_addr = 0;
|
|
options.mask.s_addr = 0;
|
|
}
|
|
|
|
/* ipup */
|
|
options.ipup = args_info.ipup_arg;
|
|
|
|
/* ipdown */
|
|
options.ipdown = args_info.ipdown_arg;
|
|
|
|
/* statedir */
|
|
options.statedir = args_info.statedir_arg;
|
|
|
|
/* defaultroute */
|
|
options.defaultroute = args_info.defaultroute_flag;
|
|
|
|
|
|
/* pinghost */
|
|
/* Store ping host as in_addr */
|
|
if (args_info.pinghost_arg) {
|
|
if (!inet_aton(args_info.pinghost_arg, &options.pinghost)) {
|
|
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
|
|
"Invalid ping host: %s!", args_info.pinghost_arg);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* Other ping parameters */
|
|
options.pingrate = args_info.pingrate_arg;
|
|
options.pingsize = args_info.pingsize_arg;
|
|
options.pingcount = args_info.pingcount_arg;
|
|
options.pingquiet = args_info.pingquiet_flag;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
int encaps_printf(struct pdp_t *pdp, void *pack, unsigned len) {
|
|
int i;
|
|
printf("The packet looks like this:\n");
|
|
for( i=0; i<len; i++) {
|
|
printf("%02x ", (unsigned char)*(char *)(pack+i));
|
|
if (!((i+1)%16)) printf("\n");
|
|
};
|
|
printf("\n");
|
|
return 0;
|
|
}
|
|
|
|
char * print_ipprot(int t) {
|
|
switch (t) {
|
|
case 1: return "ICMP";
|
|
case 6: return "TCP";
|
|
case 17: return "UDP";
|
|
default: return "Unknown";
|
|
};
|
|
}
|
|
|
|
|
|
char * print_icmptype(int t) {
|
|
static char *ttab[] = {
|
|
"Echo Reply",
|
|
"ICMP 1",
|
|
"ICMP 2",
|
|
"Dest Unreachable",
|
|
"Source Quench",
|
|
"Redirect",
|
|
"ICMP 6",
|
|
"ICMP 7",
|
|
"Echo",
|
|
"ICMP 9",
|
|
"ICMP 10",
|
|
"Time Exceeded",
|
|
"Parameter Problem",
|
|
"Timestamp",
|
|
"Timestamp Reply",
|
|
"Info Request",
|
|
"Info Reply"
|
|
};
|
|
if( t < 0 || t > 16 )
|
|
return("OUT-OF-RANGE");
|
|
return(ttab[t]);
|
|
}
|
|
|
|
int msisdn_add(struct ul16_t *src, struct ul16_t *dst, int add) {
|
|
int n;
|
|
uint64_t i64 = 0;
|
|
uint8_t msa[sizeof(i64) * 3]; /* Allocate 3 digits per octet (0..255) */
|
|
int msalen = 0;
|
|
|
|
/* Convert to uint64_t from ul16_t format (most significant digit first) */
|
|
/* ul16_t format always starts with 0x91 to indicate international format */
|
|
/* In ul16_t format 0x0f/0xf0 indicates that digit is not used */
|
|
for (n=0; n< src->l; n++) {
|
|
if ((src->v[n] & 0x0f) != 0x0f) {
|
|
i64 *= 10;
|
|
i64 += src->v[n] & 0x0f;
|
|
}
|
|
if ((src->v[n] & 0xf0) != 0xf0) {
|
|
i64 *= 10;
|
|
i64 += (src->v[n] & 0xf0) >> 4;
|
|
}
|
|
}
|
|
|
|
i64 += add;
|
|
|
|
/* Generate array with least significant digit in first octet */
|
|
while (i64) {
|
|
msa[msalen++] = i64 % 10;
|
|
i64 = i64 / 10;
|
|
}
|
|
|
|
/* Convert back to ul16_t format */
|
|
for(n=0; n<msalen; n++) {
|
|
if ((n%2) == 0) {
|
|
dst->v[((int)n/2)] = msa[msalen-n-1] + 0xf0;
|
|
dst->l += 1;
|
|
}
|
|
else {
|
|
dst->v[((int)n/2)] = (dst->v[((int)n/2)] & 0x0f) +
|
|
msa[msalen-n-1] * 16;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
int imsi_add(uint64_t src, uint64_t *dst, int add) {
|
|
/* TODO: big endian / small endian ??? */
|
|
uint64_t i64 = 0;
|
|
|
|
/* Convert from uint64_t bcd to uint64_t integer format */
|
|
/* The resulting integer format is multiplied by 10 */
|
|
while (src) {
|
|
if ((src & 0x0f) != 0x0f) {
|
|
i64 *= 10;
|
|
i64 += (src & 0x0f);
|
|
}
|
|
if ((src & 0xf0) != 0xf0) {
|
|
i64 *= 10;
|
|
i64 += (src & 0xf0) >> 4;
|
|
}
|
|
src = src >> 8;
|
|
}
|
|
|
|
i64 += add * 10;
|
|
|
|
*dst = 0;
|
|
while (i64) {
|
|
*dst = *dst << 4;
|
|
*dst += (i64 % 10);
|
|
i64 = i64 / 10;
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
/* Calculate time left until we have to send off next ping packet */
|
|
int ping_timeout(struct timeval *tp) {
|
|
struct timezone tz;
|
|
struct timeval tv;
|
|
int diff;
|
|
if ((options.pinghost.s_addr) && (2 == state) &&
|
|
((pingseq < options.pingcount) || (options.pingcount == 0))) {
|
|
gettimeofday(&tv, &tz);
|
|
diff = 1000000 / options.pingrate * pingseq -
|
|
1000000 * (tv.tv_sec - firstping.tv_sec) -
|
|
(tv.tv_usec - firstping.tv_usec); /* Microseconds safe up to 500 sec */
|
|
tp->tv_sec = 0;
|
|
if (diff > 0)
|
|
tp->tv_usec = diff;
|
|
else {
|
|
/* For some reason we get packet loss if set to zero */
|
|
tp->tv_usec = 100000 / options.pingrate; /* 10 times pingrate */
|
|
tp->tv_usec = 0;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Print out statistics when at the end of ping sequence */
|
|
int ping_finish()
|
|
{
|
|
struct timezone tz;
|
|
struct timeval tv;
|
|
int elapsed;
|
|
gettimeofday(&tv, &tz);
|
|
elapsed = 1000000 * (tv.tv_sec - firstping.tv_sec) +
|
|
(tv.tv_usec - firstping.tv_usec); /* Microseconds */
|
|
printf("\n");
|
|
printf("\n----%s PING Statistics----\n", inet_ntoa(options.pinghost));
|
|
printf("%d packets transmitted in %.3f seconds, ", ntransmitted,
|
|
elapsed / 1000000.0);
|
|
printf("%d packets received, ", nreceived );
|
|
if (ntransmitted) {
|
|
if( nreceived > ntransmitted)
|
|
printf("-- somebody's printing up packets!");
|
|
else
|
|
printf("%d%% packet loss",
|
|
(int) (((ntransmitted-nreceived)*100) /
|
|
ntransmitted));
|
|
}
|
|
printf("\n");
|
|
if (options.debug) printf("%d packets received in total\n", ntreceived );
|
|
if (nreceived && tsum)
|
|
printf("round-trip (ms) min/avg/max = %.3f/%.3f/%.3f\n\n",
|
|
tmin/1000.0,
|
|
tsum/1000.0/nreceived,
|
|
tmax/1000.0 );
|
|
printf("%d packets transmitted \n", ntreceived );
|
|
|
|
ntransmitted = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* Handle a received ping packet. Print out line and update statistics. */
|
|
int encaps_ping(struct pdp_t *pdp, void *pack, unsigned len) {
|
|
struct timezone tz;
|
|
struct timeval tv;
|
|
struct timeval *tp;
|
|
struct ip_ping *pingpack = pack;
|
|
struct in_addr src;
|
|
int triptime;
|
|
|
|
src.s_addr = pingpack->src;
|
|
|
|
gettimeofday(&tv, &tz);
|
|
if (options.debug) printf("%d.%6d ", (int) tv.tv_sec, (int) tv.tv_usec);
|
|
|
|
if (len < CREATEPING_IP + CREATEPING_ICMP) {
|
|
printf("packet too short (%d bytes) from %s\n", len,
|
|
inet_ntoa(src));
|
|
return 0;
|
|
}
|
|
|
|
ntreceived++;
|
|
if (pingpack->protocol != 1) {
|
|
if (!options.pingquiet) printf("%d bytes from %s: ip_protocol=%d (%s)\n",
|
|
len, inet_ntoa(src), pingpack->protocol,
|
|
print_ipprot(pingpack->protocol));
|
|
return 0;
|
|
}
|
|
|
|
if (pingpack->type != 0) {
|
|
if (!options.pingquiet) printf("%d bytes from %s: icmp_type=%d (%s) icmp_code=%d\n",
|
|
len, inet_ntoa(src), pingpack->type,
|
|
print_icmptype(pingpack->type), pingpack->code);
|
|
return 0;
|
|
}
|
|
|
|
nreceived++;
|
|
if (!options.pingquiet) printf("%d bytes from %s: icmp_seq=%d", len,
|
|
inet_ntoa(src), ntohs(pingpack->seq));
|
|
|
|
if (len >= sizeof(struct timeval) + CREATEPING_IP + CREATEPING_ICMP) {
|
|
gettimeofday(&tv, &tz);
|
|
tp = (struct timeval *) pingpack->data;
|
|
if( (tv.tv_usec -= tp->tv_usec) < 0 ) {
|
|
tv.tv_sec--;
|
|
tv.tv_usec += 1000000;
|
|
}
|
|
tv.tv_sec -= tp->tv_sec;
|
|
|
|
triptime = tv.tv_sec*1000000+(tv.tv_usec);
|
|
tsum += triptime;
|
|
if( triptime < tmin )
|
|
tmin = triptime;
|
|
if( triptime > tmax )
|
|
tmax = triptime;
|
|
|
|
if (!options.pingquiet) printf(" time=%.3f ms\n", triptime/1000.0);
|
|
|
|
}
|
|
else
|
|
if (!options.pingquiet) printf("\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Create a new ping packet and send it off to peer. */
|
|
int create_ping(void *gsn, struct pdp_t *pdp,
|
|
struct in_addr *dst, int seq, int datasize) {
|
|
|
|
struct ip_ping pack;
|
|
uint16_t *p = (uint16_t *) &pack;
|
|
uint8_t *p8 = (uint8_t *) &pack;
|
|
struct in_addr src;
|
|
int n;
|
|
long int sum = 0;
|
|
int count = 0;
|
|
|
|
struct timezone tz;
|
|
struct timeval *tp = (struct timeval *) &p8[CREATEPING_IP + CREATEPING_ICMP];
|
|
|
|
if (datasize > CREATEPING_MAX) {
|
|
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
|
|
"Ping size to large: %d!", datasize);
|
|
return -1;
|
|
}
|
|
|
|
memcpy(&src, &(pdp->eua.v[2]), 4); /* Copy a 4 byte address */
|
|
|
|
pack.ipver = 0x45;
|
|
pack.tos = 0x00;
|
|
pack.length = htons(CREATEPING_IP + CREATEPING_ICMP + datasize);
|
|
pack.fragid = 0x0000;
|
|
pack.offset = 0x0040;
|
|
pack.ttl = 0x40;
|
|
pack.protocol = 0x01;
|
|
pack.ipcheck = 0x0000;
|
|
pack.src = src.s_addr;
|
|
pack.dst = dst->s_addr;
|
|
pack.type = 0x08;
|
|
pack.code = 0x00;
|
|
pack.checksum = 0x0000;
|
|
pack.ident = 0x0000;
|
|
pack.seq = htons(seq);
|
|
|
|
/* Generate ICMP payload */
|
|
p8 = (uint8_t *) &pack + CREATEPING_IP + CREATEPING_ICMP;
|
|
for (n=0; n<(datasize); n++) p8[n] = n;
|
|
|
|
if (datasize >= sizeof(struct timeval))
|
|
gettimeofday(tp, &tz);
|
|
|
|
/* Calculate IP header checksum */
|
|
p = (uint16_t *) &pack;
|
|
count = CREATEPING_IP;
|
|
sum = 0;
|
|
while (count>1) {
|
|
sum += *p++;
|
|
count -= 2;
|
|
}
|
|
while (sum>>16)
|
|
sum = (sum & 0xffff) + (sum >> 16);
|
|
pack.ipcheck = ~sum;
|
|
|
|
|
|
/* Calculate ICMP checksum */
|
|
count = CREATEPING_ICMP + datasize; /* Length of ICMP message */
|
|
sum = 0;
|
|
p = (uint16_t *) &pack;
|
|
p += CREATEPING_IP / 2;
|
|
while (count>1) {
|
|
sum += *p++;
|
|
count -= 2;
|
|
}
|
|
if (count>0)
|
|
sum += * (unsigned char *) p;
|
|
while (sum>>16)
|
|
sum = (sum & 0xffff) + (sum >> 16);
|
|
pack.checksum = ~sum;
|
|
|
|
ntransmitted++;
|
|
return gtp_data_req(gsn, pdp, &pack, 28 + datasize);
|
|
}
|
|
|
|
|
|
int delete_context(struct pdp_t *pdp) {
|
|
|
|
if (tun && options.ipdown) tun_runscript(tun, options.ipdown);
|
|
|
|
ipdel((struct iphash_t*) pdp->peer);
|
|
memset(pdp->peer, 0, sizeof(struct iphash_t)); /* To be sure */
|
|
|
|
if (1 == options.contexts)
|
|
state = 5; /* Disconnected */
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Callback for receiving messages from tun */
|
|
int cb_tun_ind(struct tun_t *tun, void *pack, unsigned len) {
|
|
struct iphash_t *ipm;
|
|
struct in_addr src;
|
|
struct tun_packet_t *iph = (struct tun_packet_t*) pack;
|
|
|
|
src.s_addr = iph->src;
|
|
|
|
if (ipget(&ipm, &src)) {
|
|
printf("Received packet without a valid source address!!!\n");
|
|
return 0;
|
|
}
|
|
|
|
if (ipm->pdp) /* Check if a peer protocol is defined */
|
|
gtp_data_req(gsn, ipm->pdp, pack, len);
|
|
return 0;
|
|
}
|
|
|
|
int create_pdp_conf(struct pdp_t *pdp, void *cbp, int cause) {
|
|
struct in_addr addr;
|
|
|
|
struct iphash_t *iph = (struct iphash_t*) cbp;
|
|
|
|
if (cause < 0) {
|
|
printf("Create PDP Context Request timed out\n");
|
|
if (iph->pdp->version == 1) {
|
|
printf("Retrying with version 0\n");
|
|
iph->pdp->version = 0;
|
|
gtp_create_context_req(gsn, iph->pdp, iph);
|
|
return 0;
|
|
}
|
|
else {
|
|
state = 0;
|
|
pdp_freepdp(iph->pdp);
|
|
iph->pdp = NULL;
|
|
return EOF;
|
|
}
|
|
}
|
|
|
|
if (cause != 128) {
|
|
printf("Received create PDP context response. Cause value: %d\n", cause);
|
|
state = 0;
|
|
pdp_freepdp(iph->pdp);
|
|
iph->pdp = NULL;
|
|
return EOF; /* Not what we expected */
|
|
}
|
|
|
|
if (pdp_euaton(&pdp->eua, &addr)) {
|
|
printf("Received create PDP context response. Cause value: %d\n", cause);
|
|
pdp_freepdp(iph->pdp);
|
|
iph->pdp = NULL;
|
|
state = 0;
|
|
return EOF; /* Not a valid IP address */
|
|
}
|
|
|
|
printf("Received create PDP context response. IP address: %s\n",
|
|
inet_ntoa(addr));
|
|
|
|
if ((options.createif) && (!options.net.s_addr)) {
|
|
struct in_addr m;
|
|
inet_aton("255.255.255.255", &m);
|
|
/* printf("Setting up interface and routing\n");*/
|
|
tun_addaddr(tun, &addr, &addr, &m);
|
|
if (options.defaultroute) {
|
|
struct in_addr rm;
|
|
rm.s_addr = 0;
|
|
tun_addroute(tun, &rm, &addr, &rm);
|
|
}
|
|
if (options.ipup) tun_runscript(tun, options.ipup);
|
|
}
|
|
|
|
ipset((struct iphash_t*) pdp->peer, &addr);
|
|
|
|
state = 2; /* Connected */
|
|
|
|
return 0;
|
|
}
|
|
|
|
int delete_pdp_conf(struct pdp_t *pdp, int cause) {
|
|
printf("Received delete PDP context response. Cause value: %d\n", cause);
|
|
return 0;
|
|
}
|
|
|
|
int echo_conf(int recovery) {
|
|
|
|
if (recovery < 0) {
|
|
printf("Echo Request timed out\n");
|
|
if (echoversion == 1) {
|
|
printf("Retrying with version 0\n");
|
|
echoversion = 0;
|
|
gtp_echo_req(gsn, echoversion, NULL, &options.remote);
|
|
return 0;
|
|
}
|
|
else {
|
|
state = 0;
|
|
return EOF;
|
|
}
|
|
}
|
|
else {
|
|
printf("Received echo response\n");
|
|
if (!options.contexts) state = 5;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int conf(int type, int cause, struct pdp_t* pdp, void *cbp) {
|
|
/* if (cause < 0) return 0; Some error occurred. We don't care */
|
|
switch (type) {
|
|
case GTP_ECHO_REQ:
|
|
return echo_conf(cause);
|
|
case GTP_CREATE_PDP_REQ:
|
|
return create_pdp_conf(pdp, cbp, cause);
|
|
case GTP_DELETE_PDP_REQ:
|
|
if (cause !=128) return 0; /* Request not accepted. We don't care */
|
|
return delete_pdp_conf(pdp, cause);
|
|
default:
|
|
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)
|
|
{
|
|
fd_set fds; /* For select() */
|
|
struct timeval idleTime; /* How long to select() */
|
|
struct pdp_t *pdp;
|
|
int n;
|
|
int starttime = time(NULL); /* Time program was started */
|
|
int stoptime = 0; /* Time to exit */
|
|
int pingtimeout = 0; /* Time to print ping statistics */
|
|
|
|
struct timezone tz; /* Used for calculating ping times */
|
|
struct timeval tv;
|
|
int diff;
|
|
|
|
/* 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
|
|
|
|
|
|
/* Process options given in configuration file and command line */
|
|
if (process_options(argc, argv))
|
|
exit(1);
|
|
|
|
printf("\nInitialising GTP library\n");
|
|
if (gtp_new(&gsn, options.statedir, &options.listen, GTP_MODE_SGSN)) {
|
|
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_delete_context(gsn, delete_context);
|
|
gtp_set_cb_conf(gsn, conf);
|
|
if (options.createif)
|
|
gtp_set_cb_data_ind(gsn, encaps_tun);
|
|
else
|
|
gtp_set_cb_data_ind(gsn, encaps_ping);
|
|
|
|
if (options.createif) {
|
|
printf("Setting up interface\n");
|
|
/* Create a tunnel interface */
|
|
if (tun_new((struct tun_t**) &tun)) {
|
|
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
|
|
"Failed to create tun");
|
|
exit(1);
|
|
}
|
|
tun_set_cb_ind(tun, cb_tun_ind);
|
|
if (tun->fd > maxfd) maxfd = tun->fd;
|
|
}
|
|
|
|
if ((options.createif) && (options.net.s_addr)) {
|
|
/* printf("Setting up interface and routing\n");*/
|
|
tun_addaddr(tun, &options.net, &options.net, &options.mask);
|
|
if (options.defaultroute) {
|
|
struct in_addr rm;
|
|
rm.s_addr = 0;
|
|
tun_addroute(tun, &rm, &options.net, &rm);
|
|
}
|
|
if (options.ipup) tun_runscript(tun, options.ipup);
|
|
}
|
|
|
|
|
|
/* Initialise hash tables */
|
|
memset(&iphash, 0, sizeof(iphash));
|
|
memset(&iparr, 0, sizeof(iparr));
|
|
|
|
printf("Done initialising GTP library\n\n");
|
|
|
|
/* See if anybody is there */
|
|
printf("Sending off echo request\n");
|
|
echoversion = options.gtpversion;
|
|
gtp_echo_req(gsn, echoversion, NULL, &options.remote); /* Is remote alive? */
|
|
|
|
for(n=0; n<options.contexts; n++) {
|
|
uint64_t myimsi;
|
|
printf("Setting up PDP context #%d\n", n);
|
|
iparr[n].inuse = 1; /* TODO */
|
|
|
|
imsi_add(options.imsi, &myimsi, n);
|
|
|
|
/* Allocated here. */
|
|
/* If create context failes we have to deallocate ourselves. */
|
|
/* Otherwise it is deallocated by gtplib */
|
|
pdp_newpdp(&pdp, myimsi, options.nsapi, NULL);
|
|
|
|
pdp->peer = &iparr[n];
|
|
pdp->ipif = tun; /* TODO */
|
|
iparr[n].pdp = pdp;
|
|
|
|
if (options.qos.l > sizeof(pdp->qos_req0)) {
|
|
sys_err(LOG_ERR, __FILE__, __LINE__, 0, "QoS length too big");
|
|
exit(1);
|
|
}
|
|
else {
|
|
memcpy(pdp->qos_req0, options.qos.v, options.qos.l);
|
|
}
|
|
|
|
/* TODO */
|
|
pdp->qos_req.l = 4;
|
|
pdp->qos_req.v[0] = 0x00;
|
|
memcpy(pdp->qos_req.v+1, options.qos.v, options.qos.l);
|
|
|
|
pdp->selmode = 0x01; /* MS provided APN, subscription not verified */
|
|
|
|
if (options.apn.l > sizeof(pdp->apn_use.v)) {
|
|
sys_err(LOG_ERR, __FILE__, __LINE__, 0, "APN length too big");
|
|
exit(1);
|
|
}
|
|
else {
|
|
pdp->apn_use.l = options.apn.l;
|
|
memcpy(pdp->apn_use.v, options.apn.v, options.apn.l);
|
|
}
|
|
|
|
pdp->gsnlc.l = sizeof(options.listen);
|
|
memcpy(pdp->gsnlc.v, &options.listen, sizeof(options.listen));
|
|
pdp->gsnlu.l = sizeof(options.listen);
|
|
memcpy(pdp->gsnlu.v, &options.listen, sizeof(options.listen));
|
|
|
|
if (options.msisdn.l > sizeof(pdp->msisdn.v)) {
|
|
sys_err(LOG_ERR, __FILE__, __LINE__, 0, "MSISDN length too big");
|
|
exit(1);
|
|
}
|
|
else {
|
|
msisdn_add(&options.msisdn, &pdp->msisdn, n);
|
|
}
|
|
|
|
ipv42eua(&pdp->eua, NULL); /* Request dynamic IP address */
|
|
|
|
if (options.pco.l > sizeof(pdp->pco_req.v)) {
|
|
sys_err(LOG_ERR, __FILE__, __LINE__, 0, "PCO length too big");
|
|
exit(1);
|
|
}
|
|
else {
|
|
pdp->pco_req.l = options.pco.l;
|
|
memcpy(pdp->pco_req.v, options.pco.v, options.pco.l);
|
|
}
|
|
|
|
pdp->version = options.gtpversion;
|
|
|
|
pdp->hisaddr0 = options.remote;
|
|
pdp->hisaddr1 = options.remote;
|
|
|
|
/* Create context */
|
|
/* We send this of once. Retransmissions are handled by gtplib */
|
|
gtp_create_context_req(gsn, pdp, &iparr[n]);
|
|
}
|
|
|
|
state = 1; /* Enter wait_connection state */
|
|
|
|
printf("Waiting for response from ggsn........\n\n");
|
|
|
|
|
|
/******************************************************************/
|
|
/* Main select loop */
|
|
/******************************************************************/
|
|
|
|
while ((0 != state) && (5 != state)) {
|
|
|
|
/* Take down client after timeout after disconnect */
|
|
if ((4 == state) && ((stoptime) <= time(NULL))) {
|
|
state = 5;
|
|
}
|
|
|
|
/* Take down client after timelimit timeout */
|
|
if ((2 == state) && (options.timelimit) &&
|
|
((starttime + options.timelimit) <= time(NULL))) {
|
|
state = 3;
|
|
}
|
|
|
|
/* Take down client after ping timeout */
|
|
if ((2 == state) && (pingtimeout) && (pingtimeout <= time(NULL))) {
|
|
state = 3;
|
|
}
|
|
|
|
/* Set pingtimeout for later disconnection */
|
|
if (options.pingcount && ntransmitted >= options.pingcount) {
|
|
pingtimeout = time(NULL) + 5; /* Extra seconds */
|
|
}
|
|
|
|
/* Print statistics if no more ping packets are missing */
|
|
if (ntransmitted && options.pingcount && nreceived >= options.pingcount) {
|
|
ping_finish();
|
|
if (!options.createif)
|
|
state = 3;
|
|
}
|
|
|
|
/* Send off disconnect */
|
|
if (3 == state) {
|
|
state = 4;
|
|
stoptime = time(NULL) + 5; /* Extra seconds to allow disconnect */
|
|
for(n=0; n<options.contexts; n++) {
|
|
/* Delete context */
|
|
printf("Disconnecting PDP context #%d\n", n);
|
|
gtp_delete_context_req(gsn, iparr[n].pdp, NULL, 1);
|
|
if ((options.pinghost.s_addr !=0) && ntransmitted) ping_finish();
|
|
}
|
|
}
|
|
|
|
/* Send of ping packets */
|
|
diff = 0;
|
|
while (( diff<=0 ) &&
|
|
/* Send off an ICMP ping packet */
|
|
/*if (*/(options.pinghost.s_addr) && (2 == state) &&
|
|
((pingseq < options.pingcount) || (options.pingcount == 0))) {
|
|
if (!pingseq) gettimeofday(&firstping, &tz); /* Set time of first ping */
|
|
gettimeofday(&tv, &tz);
|
|
diff = 1000000 / options.pingrate * pingseq -
|
|
1000000 * (tv.tv_sec - firstping.tv_sec) -
|
|
(tv.tv_usec - firstping.tv_usec); /* Microseconds safe up to 500 sec */
|
|
if (diff <=0) {
|
|
if (options.debug) printf("Create_ping %d\n", diff);
|
|
create_ping(gsn, iparr[pingseq % options.contexts].pdp,
|
|
&options.pinghost, pingseq, options.pingsize);
|
|
pingseq++;
|
|
}
|
|
}
|
|
|
|
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);
|
|
ping_timeout(&idleTime);
|
|
|
|
if (options.debug) printf("idletime.tv_sec %d, idleTime.tv_usec %d\n",
|
|
(int) idleTime.tv_sec, (int) idleTime.tv_usec);
|
|
|
|
switch (select(maxfd + 1, &fds, NULL, NULL, &idleTime)) {
|
|
case -1:
|
|
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
|
|
"Select returned -1");
|
|
break;
|
|
case 0:
|
|
gtp_retrans(gsn); /* Only retransmit if nothing else */
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if ((tun) && FD_ISSET(tun->fd, &fds) && tun_decaps(tun) < 0) {
|
|
sys_err(LOG_ERR, __FILE__, __LINE__, 0,
|
|
"TUN decaps failed");
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
gtp_free(gsn); /* Clean up the gsn instance */
|
|
|
|
if (options.createif)
|
|
tun_free(tun);
|
|
|
|
if (0 == state)
|
|
exit(1); /* Indicate error */
|
|
|
|
return 0;
|
|
}
|
|
|