[nat] Start to listen for the incoming BTS
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6ace522847
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@ -3,6 +3,7 @@
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/*
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* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2010 by on-waves.com
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* (C) 2009 by Harald Welte <laforge@gnumonks.org>
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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@ -24,6 +25,7 @@
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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@ -43,6 +45,7 @@ static const char *config_file = "openbsc.cfg";
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static char *msc_address = "127.0.0.1";
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static struct in_addr local_addr;
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static struct bsc_fd msc_connection;
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static struct bsc_fd bsc_connection;
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/*
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* below are stubs we need to link
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@ -110,6 +113,68 @@ static int ipaccess_msc_cb(struct bsc_fd *bfd, unsigned int what)
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return 0;
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}
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/*
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* Below is the handling of messages coming
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* from the BSC and need to be forwarded to
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* a real BSC.
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*/
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static int ipaccess_listen_bsc_cb(struct bsc_fd *bfd, unsigned int what)
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{
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int ret;
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struct sockaddr_in sa;
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socklen_t sa_len = sizeof(sa);
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if (!(what & BSC_FD_READ))
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return 0;
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ret = accept(bfd->fd, (struct sockaddr *) &sa, &sa_len);
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if (ret < 0) {
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perror("accept");
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return ret;
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}
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/* todo... do something with the connection */
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return 0;
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}
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static int listen_for_bsc(struct bsc_fd *bfd, struct in_addr *in_addr, int port)
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{
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struct sockaddr_in addr;
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int ret, on = 1;
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bfd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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bfd->cb = ipaccess_listen_bsc_cb;
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bfd->when = BSC_FD_READ;
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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addr.sin_addr.s_addr = in_addr->s_addr;
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setsockopt(bfd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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ret = bind(bfd->fd, (struct sockaddr *) &addr, sizeof(addr));
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if (ret < 0) {
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fprintf(stderr, "Could not bind the BSC socket %s\n",
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strerror(errno));
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return -EIO;
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}
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ret = listen(bfd->fd, 1);
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if (ret < 0) {
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perror("listen");
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return ret;
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}
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ret = bsc_register_fd(bfd);
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if (ret < 0) {
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perror("register_listen_fd");
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return ret;
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}
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return 0;
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}
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static void print_usage()
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{
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printf("Usage: bsc_nat\n");
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@ -123,7 +188,7 @@ static void print_help()
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printf(" -s --disable-color\n");
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printf(" -c --config-file filename The config file to use.\n");
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printf(" -m --msc=IP. The address of the MSC.\n");
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printf(" -l --local=IP. The local address of the MGCP.\n");
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printf(" -l --local=IP. The local address of this BSC.\n");
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}
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static void handle_options(int argc, char** argv)
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@ -197,11 +262,13 @@ int main(int argc, char** argv)
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int rc;
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/* parse options */
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local_addr.s_addr = INADDR_ANY;
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handle_options(argc, argv);
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/* seed the PRNG */
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srand(time(NULL));
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/* connect to the MSC */
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msc_connection.cb = ipaccess_msc_cb;
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rc = connect_to_msc(&msc_connection, msc_address, 5000);
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if (rc < 0) {
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@ -209,6 +276,12 @@ int main(int argc, char** argv)
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exit(1);
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}
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/* wait for the BSC */
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if (listen_for_bsc(&bsc_connection, &local_addr, 5000) < 0) {
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fprintf(stderr, "Failed to listen for BSC.\n");
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exit(1);
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}
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signal(SIGINT, &signal_handler);
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signal(SIGABRT, &signal_handler);
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signal(SIGUSR1, &signal_handler);
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