mirror of
https://github.com/ntop/n2n.git
synced 2024-09-19 16:41:11 +02:00
51a3a71f95
* moved dev to version 3.1.1 * introduced n2n-portfwd tool * moved port-forwarding source to tool * adjusted tiny things, seemingly works with ./configure's --enable-miniupnp and --enable-natpmp * adjusted for Windows * wished for better typing skills * applied some finishing touch * typo
377 lines
11 KiB
C
377 lines
11 KiB
C
/**
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* (C) 2007-22 - ntop.org and contributors
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not see see <http://www.gnu.org/licenses/>
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*
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*/
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#include "n2n.h"
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#define WITH_PORT 1
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#define CORRECT_TAG 2
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#define SOCKET_TIMEOUT 2
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#define INFO_INTERVAL 5
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#ifdef WIN32
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#define STDIN_FILENO _fileno(stdin)
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#endif
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typedef struct n2n_portfwd_conf {
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uint16_t port; /* management port */
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} n2n_portfwd_conf_t;
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static int keep_running = 1; /* for main loop, handled by signals */
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// -------------------------------------------------------------------------------------------------------
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// PLATFORM-DEPENDANT CODE (FOR NON-MANDATORY FEATURE)
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void set_term_handler(const void *handler) {
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#ifdef __linux__
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signal(SIGPIPE, SIG_IGN);
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signal(SIGTERM, handler);
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signal(SIGINT, handler);
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#endif
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#ifdef WIN32
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SetConsoleCtrlHandler(handler, TRUE);
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#endif
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}
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#ifdef WIN32
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BOOL WINAPI term_handler (DWORD sig) {
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#else
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static void term_handler (int sig) {
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#endif
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static int called = 0;
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if(called) {
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traceEvent(TRACE_NORMAL, "ok, leaving now");
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_exit(0);
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} else {
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traceEvent(TRACE_NORMAL, "shutting down...");
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called = 1;
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}
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keep_running = 0;
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#ifdef WIN32
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return TRUE;
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#endif
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}
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// -------------------------------------------------------------------------------------------------------
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SOCKET connect_to_management_port (n2n_portfwd_conf_t *ppp) {
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SOCKET ret;
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struct sockaddr_in sock_addr;
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ret = socket (PF_INET, SOCK_DGRAM, 0);
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if((int)ret < 0)
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return -1;
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sock_addr.sin_family = AF_INET;
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sock_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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sock_addr.sin_port = htons(ppp->port);
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if(0 != connect(ret, (struct sockaddr *)&sock_addr, sizeof(sock_addr)))
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return -1;
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return ret;
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}
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// -------------------------------------------------------------------------------------------------------
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int get_port_from_json (uint16_t *port, json_object_t *json, char *key, int tag, int flags) {
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int i;
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char *colon = NULL;
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if(NULL == json)
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return 0;
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for(i = 0; i < json->count; i++) {
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if(json->pairs[i].type == JSON_STRING) {
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if(!strcmp(json->pairs[i].key, key)) {
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// cut off port from IP address
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if((colon = strchr(json->pairs[i].value->string_value, ':'))) {
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if(*colon != '\0') {
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*port = atoi(colon + 1);
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flags |= WITH_PORT;
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}
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}
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}
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if(!strcmp(json->pairs[i].key, "_tag" )) {
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if(atoi(json->pairs[i].value->string_value) == tag) {
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flags |= CORRECT_TAG;
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}
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}
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} else if(json->pairs[i].type == JSON_OBJECT) {
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flags |= get_port_from_json(port, json, key, tag, flags);
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}
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}
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return flags;
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}
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// -------------------------------------------------------------------------------------------------------
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// taken from https://web.archive.org/web/20170407122137/http://cc.byexamples.com/2007/04/08/non-blocking-user-input-in-loop-without-ncurses/
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int kbhit () {
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struct timeval tv;
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fd_set fds;
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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FD_ZERO(&fds);
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FD_SET(STDIN_FILENO, &fds); //STDIN_FILENO is 0
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select(STDIN_FILENO + 1, &fds, NULL, NULL, &tv);
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return FD_ISSET(STDIN_FILENO, &fds);
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}
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// -------------------------------------------------------------------------------------------------------
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static void help (int level) {
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if(level == 0) return; /* no help required */
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printf(" n2n-portfwd [-t <manangement_port>] [-V] [-v]"
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"\n"
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"\n This tool tries to find a router in local network and asks it to"
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"\n forward the edge's port(UDP and TCP) by sending corresponding"
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"\n UPnP and PMP requests."
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"\n\n Adapt port (default: %d) to match your edge's management port"
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"\n configuration."
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"\n\n Verbosity can be increased or decreased with -V or -v , repeat as"
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"\n as needed."
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"\n\n",
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N2N_EDGE_MGMT_PORT);
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exit(0);
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}
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static int set_option (n2n_portfwd_conf_t *ppp, int optkey, char *optargument) {
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switch(optkey) {
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case 't': /* management port */ {
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uint16_t port = atoi(optargument);
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if(port) {
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ppp->port = port;
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} else {
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traceEvent(TRACE_WARNING, "invalid management port provided with '-t'");
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}
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break;
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}
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case 'V': /* more verbose */ {
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setTraceLevel(getTraceLevel() + 1);
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break;
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}
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case 'v': /* less verbose */ {
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setTraceLevel(getTraceLevel() - 1);
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break;
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}
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default: /* unknown option */ {
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return 1; /* for help */
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}
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}
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return 0;
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}
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// -------------------------------------------------------------------------------------------------------
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int main (int argc, char* argv[]) {
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n2n_portfwd_conf_t ppp;
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uint8_t c;
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SOCKET sock;
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size_t msg_len;
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char udp_buf[N2N_PKT_BUF_SIZE];
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fd_set socket_mask;
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struct timeval wait_time;
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time_t now = 0;
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time_t last_info_req = 0;
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json_object_t *json;
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int ret;
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int tag_info;
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uint16_t port = 0, current_port = 0;
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// version
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print_n2n_version();
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// ensure prerequisites
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#ifndef HAVE_MINIUPNP
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traceEvent(TRACE_WARNING, "no miniupnp support compiled");
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#else
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traceEvent(TRACE_NORMAL, "compiled with miniupnp support");
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#endif
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#ifndef HAVE_NATPMP
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traceEvent(TRACE_WARNING, "no natpmp support compiled");
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#else
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traceEvent(TRACE_NORMAL, "compiled with natpmp support");
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#endif
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#if !defined(HAVE_MINIUPNP) && !defined(HAVE_NATPMP)
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traceEvent(TRACE_WARNING, "no port forwarding method found");
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return -1;
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#endif
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// handle signals to properly end the tool
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set_term_handler(term_handler);
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// init data structure
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ppp.port = N2N_EDGE_MGMT_PORT;
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setTraceLevel(2); /* NORMAL, should already be default */
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n2n_srand(n2n_seed());
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// get command line options and eventually overwrite initialized conf
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while((c = getopt_long(argc, argv, "t:vV", NULL, NULL)) != '?') {
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if(c == 255) break;
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help(set_option(&ppp, c, optarg));
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}
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// verify conf and react with output to conf-related changes
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// (nothing to do)
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// additional checks
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// (nothing to do)
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// connect to mamagement port
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traceEvent(TRACE_NORMAL, "connecting to edge management port %d", ppp.port);
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sock = connect_to_management_port(&ppp);
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if(sock == -1) {
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traceEvent(TRACE_ERROR, "unable to open socket for management port connection");
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goto end_route_tool;
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}
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// output status
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traceEvent(TRACE_NORMAL, "press ENTER to end the program");
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reset_main_loop:
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wait_time.tv_sec = SOCKET_TIMEOUT;
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wait_time.tv_usec = 0;
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port = 0;
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current_port = 0;
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tag_info = 0;
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// main loop
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// read answer packet by packet which are only accepted if a corresponding request was sent before
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// of which we know about by having set the related tag, tag_info
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// a valid sock address indicates that we have seen a valid answer to the info request
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while(keep_running && !kbhit()) {
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// current time
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now = time(NULL);
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// check if we need to send info request again
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if(now > last_info_req + INFO_INTERVAL) {
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// send info read request
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while(!(tag_info = ((uint32_t)n2n_rand()) >> 23));
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msg_len = 0;
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msg_len += snprintf((char *) (udp_buf + msg_len), (N2N_PKT_BUF_SIZE - msg_len),
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"r %u info\n", tag_info);
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ret = send(sock, udp_buf, msg_len, 0);
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last_info_req = now;
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}
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// wait for any answer to info or read request
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FD_ZERO(&socket_mask);
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FD_SET(sock, &socket_mask);
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ret = select(sock + 1, &socket_mask, NULL, NULL, &wait_time);
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// refresh current time after having waited
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now = time(NULL);
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if(ret > 0) {
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if(FD_ISSET(sock, &socket_mask)) {
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msg_len = recv(sock, udp_buf, sizeof(udp_buf), 0);
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if((msg_len > 0) && (msg_len < sizeof(udp_buf))) {
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// make sure it is a string and replace all newlines with spaces
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udp_buf[msg_len] = '\0';
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for (char *p = udp_buf; (p = strchr(p, '\n')) != NULL; p++) *p = ' ';
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traceEvent(TRACE_DEBUG, "received '%s' from management port", udp_buf);
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// handle the answer, json needs to be freed later
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json = json_parse(udp_buf);
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// look for local edge information
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if(tag_info) {
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// local IP address port
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port = 0;
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ret = get_port_from_json(&port, json, "sockaddr", tag_info, 0);
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if(ret == (WITH_PORT | CORRECT_TAG)) {
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traceEvent(TRACE_DEBUG, "received information about edge port %d", port);
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// evaluate current situation and take appropriate action
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if(port != current_port) {
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traceEvent(TRACE_NORMAL, "found edge port %d", port);
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if(current_port)
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n2n_del_port_mapping(current_port);
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if(port)
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n2n_set_port_mapping(port);
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current_port = port;
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}
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}
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}
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// no need for current json object anymore
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json_free(json);
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}
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} else {
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// can this happen? reset the loop
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traceEvent(TRACE_ERROR, "loop reset");
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goto reset_main_loop;
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}
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} else if(ret == 0) {
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// select() timeout
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// action required?
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} else {
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// select() error
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// action required?
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}
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}
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end_route_tool:
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// delete port forwarding if any
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if(current_port)
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n2n_del_port_mapping(current_port);
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// close connection
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closesocket(sock);
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return 0;
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}
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