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[nat] Start to listen for the incoming BTS

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This commit is contained in:
Holger Hans Peter Freyther
2010-01-12 21:34:54 +01:00
parent 6c1c76683f
commit 7253154fc5
1 changed files with 74 additions and 1 deletions
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75
openbsc/src/nat/bsc_nat.c
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@@ -3,6 +3,7 @@
/*
* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2010 by on-waves.com
* (C) 2009 by Harald Welte <laforge@gnumonks.org>
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
@@ -24,6 +25,7 @@
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
@@ -43,6 +45,7 @@ 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;
static struct bsc_fd bsc_connection;
/*
* below are stubs we need to link
@@ -110,6 +113,68 @@ static int ipaccess_msc_cb(struct bsc_fd *bfd, unsigned int what)
return 0;
}
/*
* Below is the handling of messages coming
* from the BSC and need to be forwarded to
* a real BSC.
*/
static int ipaccess_listen_bsc_cb(struct bsc_fd *bfd, unsigned int what)
{
int ret;
struct sockaddr_in sa;
socklen_t sa_len = sizeof(sa);
if (!(what & BSC_FD_READ))
return 0;
ret = accept(bfd->fd, (struct sockaddr *) &sa, &sa_len);
if (ret < 0) {
perror("accept");
return ret;
}
/* todo... do something with the connection */
return 0;
}
static int listen_for_bsc(struct bsc_fd *bfd, struct in_addr *in_addr, int port)
{
struct sockaddr_in addr;
int ret, on = 1;
bfd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
bfd->cb = ipaccess_listen_bsc_cb;
bfd->when = BSC_FD_READ;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = in_addr->s_addr;
setsockopt(bfd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
ret = bind(bfd->fd, (struct sockaddr *) &addr, sizeof(addr));
if (ret < 0) {
fprintf(stderr, "Could not bind the BSC socket %s\n",
strerror(errno));
return -EIO;
}
ret = listen(bfd->fd, 1);
if (ret < 0) {
perror("listen");
return ret;
}
ret = bsc_register_fd(bfd);
if (ret < 0) {
perror("register_listen_fd");
return ret;
}
return 0;
}
static void print_usage()
{
printf("Usage: bsc_nat\n");
@@ -123,7 +188,7 @@ static void print_help()
printf(" -s --disable-color\n");
printf(" -c --config-file filename The config file to use.\n");
printf(" -m --msc=IP. The address of the MSC.\n");
printf(" -l --local=IP. The local address of the MGCP.\n");
printf(" -l --local=IP. The local address of this BSC.\n");
}
static void handle_options(int argc, char** argv)
@@ -197,11 +262,13 @@ int main(int argc, char** argv)
int rc;
/* parse options */
local_addr.s_addr = INADDR_ANY;
handle_options(argc, argv);
/* seed the PRNG */
srand(time(NULL));
/* connect to the MSC */
msc_connection.cb = ipaccess_msc_cb;
rc = connect_to_msc(&msc_connection, msc_address, 5000);
if (rc < 0) {
@@ -209,6 +276,12 @@ int main(int argc, char** argv)
exit(1);
}
/* wait for the BSC */
if (listen_for_bsc(&bsc_connection, &local_addr, 5000) < 0) {
fprintf(stderr, "Failed to listen for BSC.\n");
exit(1);
}
signal(SIGINT, &signal_handler);
signal(SIGABRT, &signal_handler);
signal(SIGUSR1, &signal_handler);