129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
/*
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* Copyright (c) 2014 Cesanta Software Limited
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* All rights reserved
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*/
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#include "mongoose.h"
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static sig_atomic_t s_signal_received = 0;
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static const char *s_http_port = "3579";
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static struct mg_serve_http_opts s_http_server_opts;
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static char serverpass[100];
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static struct mg_connection *selfClient = NULL;
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static void signal_handler(int sig_num) {
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signal(sig_num, signal_handler); // Reinstantiate signal handler
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s_signal_received = sig_num;
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}
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static int is_websocket(const struct mg_connection *nc) {
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return nc->flags & MG_F_IS_WEBSOCKET;
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}
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static void broadcast(struct mg_connection *nc, const struct mg_str msg) {
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struct mg_connection *c;
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char buf[500];
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snprintf(buf, sizeof(buf), "%.*s", (int) msg.len, msg.p);
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printf("%s\n", buf); /* Local echo. */
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for (c = mg_next(nc->mgr, NULL); c != NULL; c = mg_next(nc->mgr, c)) {
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if (c == nc) continue; /* Don't send to the sender. */
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mg_send_websocket_frame(c, WEBSOCKET_OP_TEXT, buf, strlen(buf));
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}
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}
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static void unicast(struct mg_connection *nc,const struct mg_str msg) {
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char buf[5000];
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snprintf(buf, sizeof(buf), "%.*s", (int) msg.len, msg.p);
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printf("%s\n", buf); /* Local echo. */
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if(nc != NULL)
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mg_send_websocket_frame(nc, WEBSOCKET_OP_TEXT, buf, strlen(buf));
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else
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printf("No selfClient is connected!\n");
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}
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static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
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switch (ev) {
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case MG_EV_WEBSOCKET_HANDSHAKE_DONE: {
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/* New websocket connection. Tell everybody. */
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//broadcast(nc, mg_mk_str("++ joined"));
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break;
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}
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case MG_EV_WEBSOCKET_FRAME: {
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struct websocket_message *wm = (struct websocket_message *) ev_data;
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/* New websocket message. Tell everybody. */
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struct mg_str d = {(char *) wm->data, wm->size};
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if (d.p[0] == '$'){
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char pass[100];
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snprintf(pass, sizeof(pass), "%.*s",(int)d.len-1, &d.p[1]);
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if(!strcmp(pass,serverpass)){
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if(selfClient!=NULL)
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unicast(selfClient,mg_mk_str("$Another login is encountered! Please close/refresh this window"));
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selfClient = nc;
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unicast(selfClient,mg_mk_str("$Access Granted!"));
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broadcast(nc, mg_mk_str("#+"));
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}else
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unicast(nc,mg_mk_str("$Access Denied!"));
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}
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else if(d.p[0] == '#'){
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if(selfClient == NULL)
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unicast(nc,mg_mk_str("#-"));
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else
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unicast(nc,mg_mk_str("#+"));
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}
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else
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unicast(selfClient,d);
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break;
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}
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case MG_EV_HTTP_REQUEST: {
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mg_serve_http(nc, (struct http_message *) ev_data, s_http_server_opts);
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break;
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}
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case MG_EV_CLOSE: {
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/* Disconnect. Tell everybody. */
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if (is_websocket(nc)) {
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if(nc == selfClient){
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selfClient = NULL;
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broadcast(nc, mg_mk_str("#-"));
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}
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}
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break;
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}
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}
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}
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int main(int argc, char** argv) {
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if(argc<=1){
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printf("Enter server password : ");
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scanf("%s",serverpass);
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}
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else
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strcpy(serverpass,argv[1]);
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struct mg_mgr mgr;
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struct mg_connection *nc;
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signal(SIGTERM, signal_handler);
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signal(SIGINT, signal_handler);
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setvbuf(stdout, NULL, _IOLBF, 0);
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setvbuf(stderr, NULL, _IOLBF, 0);
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mg_mgr_init(&mgr, NULL);
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nc = mg_bind(&mgr, s_http_port, ev_handler);
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mg_set_protocol_http_websocket(nc);
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s_http_server_opts.document_root = "app"; // Serve current directory
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s_http_server_opts.enable_directory_listing = "no";
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printf("Started on port %s\n", s_http_port);
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while (s_signal_received == 0) {
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mg_mgr_poll(&mgr, 200);
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}
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mg_mgr_free(&mgr);
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return 0;
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}
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