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osmo-mgw
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[nat] Connect to the MSC like the real BSC 

Use the connect_to_msc method to connect to the MSC and
create structure to handle and forward messages to the
real BSC.
This commit is contained in:
Holger Hans Peter Freyther 2010-01-12 21:15:08 +01:00
parent eef86b5d59
commit 6ace522847
1 changed files with 107 additions and 0 deletions
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107
openbsc/src/nat/bsc_nat.c
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@ -24,6 +24,7 @@
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
@ -32,10 +33,82 @@
#include <getopt.h>
#include <openbsc/debug.h>
#include <openbsc/msgb.h>
#include <openbsc/bsc_msc.h>
#include <openbsc/ipaccess.h>
#include <openbsc/abis_nm.h>
#include <openbsc/talloc.h>
static const char *config_file = "openbsc.cfg";
static char *msc_address = "127.0.0.1";
static struct in_addr local_addr;
static struct bsc_fd msc_connection;
/*
* below are stubs we need to link
*/
int nm_state_event(enum nm_evt evt, u_int8_t obj_class, void *obj,
struct gsm_nm_state *old_state, struct gsm_nm_state *new_state)
{
return -1;
}
void input_event(int event, enum e1inp_sign_type type, struct gsm_bts_trx *trx)
{}
int gsm0408_rcvmsg(struct msgb *msg, u_int8_t link_id)
{
return -1;
}
/*
* Below is the handling of messages coming
* from the MSC and need to be forwarded to
* a real BSC.
*/
static void initialize_msc_if_needed()
{
static int init = 0;
init = 1;
/* do we need to send a GSM 08.08 message here? */
}
static void forward_sccp_to_bts(struct msgb *msg)
{
/* filter, drop, patch the message? */
}
static int ipaccess_msc_cb(struct bsc_fd *bfd, unsigned int what)
{
int error;
struct msgb *msg = ipaccess_read_msg(bfd, &error);
struct ipaccess_head *hh;
if (!msg) {
if (error == 0) {
fprintf(stderr, "The connection to the MSC was lost, exiting\n");
exit(-2);
}
fprintf(stderr, "Failed to parse ip access message: %d\n", error);
return -1;
}
DEBUGP(DMSC, "MSG from MSC: %s proto: %d\n", hexdump(msg->data, msg->len), msg->l2h[0]);
/* handle base message handling */
hh = (struct ipaccess_head *) msg->data;
ipaccess_rcvmsg_base(msg, bfd);
/* initialize the networking. This includes sending a GSM08.08 message */
if (hh->proto == IPAC_PROTO_IPACCESS && msg->l2h[0] == IPAC_MSGT_ID_ACK)
initialize_msc_if_needed();
else if (hh->proto == IPAC_PROTO_SCCP)
forward_sccp_to_bts(msg);
return 0;
}
static void print_usage()
{
@ -103,13 +176,47 @@ static void handle_options(int argc, char** argv)
}
}
static void signal_handler(int signal)
{
fprintf(stdout, "signal %u received\n", signal);
switch (signal) {
case SIGABRT:
/* in case of abort, we want to obtain a talloc report
* and then return to the caller, who will abort the process */
case SIGUSR1:
talloc_report_full(tall_bsc_ctx, stderr);
break;
default:
break;
}
}
int main(int argc, char** argv)
{
int rc;
/* parse options */
handle_options(argc, argv);
/* seed the PRNG */
srand(time(NULL));
msc_connection.cb = ipaccess_msc_cb;
rc = connect_to_msc(&msc_connection, msc_address, 5000);
if (rc < 0) {
fprintf(stderr, "Opening the MSC connection failed.\n");
exit(1);
}
signal(SIGINT, &signal_handler);
signal(SIGABRT, &signal_handler);
signal(SIGUSR1, &signal_handler);
signal(SIGPIPE, SIG_IGN);
while (1) {
bsc_select_main(0);
}
return 0;
}