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sairajzero 2019-09-27 21:34:16 +05:30
parent bf24208898
commit dd402cd454
6 changed files with 24533 additions and 2 deletions
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.gitattributes vendored
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# Auto detect text files and perform LF normalization
* text=auto
*.gitattributes linguist-vendored
util/mongoose.c linguist-vendored
util/mongoose.h linguist-vendored
.gitattributes export-ignore
util/* export-ignore

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/*
* Copyright (c) 2014 Cesanta Software Limited
* All rights reserved
*/
#include "mongoose.h"
static sig_atomic_t s_signal_received = 0;
static const char *s_http_port = "8000";
static struct mg_serve_http_opts s_http_server_opts;
static char server_pwd[100];
static struct mg_connection *supernode_client = NULL;
static void signal_handler(int sig_num) {
signal(sig_num, signal_handler); // Reinstantiate signal handler
s_signal_received = sig_num;
}
//Display Message in console/terminal
static void display(struct mg_connection *nc, char type[25]){
char addr[32];
mg_sock_addr_to_str(&nc->sa, addr, sizeof(addr), MG_SOCK_STRINGIFY_IP | MG_SOCK_STRINGIFY_PORT);
printf("%s\t%s\n", addr, type);
}
//Broadcast incoming message (from nc to all)
static void broadcast(struct mg_connection *nc, const struct mg_str msg) {
char addr[32];
mg_sock_addr_to_str(&nc->sa, addr, sizeof(addr), MG_SOCK_STRINGIFY_IP | MG_SOCK_STRINGIFY_PORT);
printf("%s\tBroadcast\t[%d]\n", addr, (int)msg.len);
struct mg_connection *c;
for (c = mg_next(nc->mgr, NULL); c != NULL; c = mg_next(nc->mgr, c)) {
if (c == nc) continue; /* Don't send to the sender. */
mg_send_websocket_frame(c, WEBSOCKET_OP_TEXT, msg.p, msg.len);
}
}
//Unicast message (to nc)
static void unicast(struct mg_connection *nc, const struct mg_str msg) {
char addr[32];
mg_sock_addr_to_str(&nc->sa, addr, sizeof(addr), MG_SOCK_STRINGIFY_IP | MG_SOCK_STRINGIFY_PORT);
printf("%s\tUnicast\t[%d]\n", addr, (int)msg.len);
if(nc != NULL)
mg_send_websocket_frame(nc, WEBSOCKET_OP_TEXT, msg.p, msg.len);
}
//Forward message (from nc to supernode)
static void unicast_forward(struct mg_connection *nc, const struct mg_str msg) {
char addr[32];
mg_sock_addr_to_str(&nc->sa, addr, sizeof(addr), MG_SOCK_STRINGIFY_IP | MG_SOCK_STRINGIFY_PORT);
printf("%s\tForward\t[%d]\n", addr, (int)msg.len);
if(supernode_client != NULL)
mg_send_websocket_frame(supernode_client, WEBSOCKET_OP_TEXT, msg.p, msg.len);
else
printf("SuperNode client is offline!\n");
}
//Request message (from nc to supernode)
static void unicast_request(struct mg_connection *nc, const struct mg_str msg) {
if(supernode_client == NULL){
printf("SuperNode client is offline!\n");
return;
}
char addr[32], buf[500];
mg_sock_addr_to_str(&nc->sa, addr, sizeof(addr), MG_SOCK_STRINGIFY_IP | MG_SOCK_STRINGIFY_PORT);
printf("%s\tRequest\t[%d]\n", addr, (int)msg.len-1);
snprintf(buf, sizeof(buf), "?%s %.*s", addr, (int) msg.len-1, msg.p+1);
mg_send_websocket_frame(supernode_client, WEBSOCKET_OP_TEXT, buf, strlen(buf));
}
//Reply message (from supernode)
static void unicast_reply(const struct mg_str msg) {
if(supernode_client == NULL){
printf("SuperNode client is offline!\n");
return;
}
//Get receiver address from msg
char receiverAddr[32];
int index = (int)(strchr(msg.p, ' ') - msg.p) + 1;
snprintf(receiverAddr, sizeof(receiverAddr), "%.*s", index, msg.p);
printf("%s\tReply\t[%d]\n", receiverAddr, (int)msg.len - index);
//send msg to receiver
struct mg_connection *c;
for (c = mg_next(supernode_client->mgr, NULL); c != NULL; c = mg_next(supernode_client->mgr, c)) {
char addr[32];
mg_sock_addr_to_str(&c->sa, addr, sizeof(addr), MG_SOCK_STRINGIFY_IP | MG_SOCK_STRINGIFY_PORT);
if (!strcmp(receiverAddr,addr))
mg_send_websocket_frame(c, WEBSOCKET_OP_TEXT, msg.p + index, msg.len - index);
}
}
static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
switch (ev) {
case MG_EV_WEBSOCKET_HANDSHAKE_DONE: {
/*New websocket connection*/
display(nc, "+Connected+");
break;
}
case MG_EV_WEBSOCKET_FRAME: {
struct websocket_message *wm = (struct websocket_message *) ev_data;
/* New websocket message*/
struct mg_str d = {(char *) wm->data, wm->size};
if (d.p[0] == '$'){
char pass[100];
snprintf(pass, sizeof(pass), "%.*s",(int)d.len-1, &d.p[1]);
if(!strcmp(pass,server_pwd)){
if(supernode_client!=NULL)
unicast(supernode_client,mg_mk_str("$Another login is encountered! Please close/refresh this window"));
supernode_client = nc;
unicast(supernode_client,mg_mk_str("$Access Granted!"));
display(nc, "*Became SuperNode*");
}else
unicast(nc,mg_mk_str("$Access Denied!"));
}
else if (d.p[0] == '?')
unicast_request(nc,d);
else if (nc == supernode_client)
unicast_reply(d);
else
unicast_forward(nc,d);
break;
}
case MG_EV_HTTP_REQUEST: {
mg_serve_http(nc, (struct http_message *) ev_data, s_http_server_opts);
break;
}
case MG_EV_CLOSE: {
/* Disconnect websocket*/
if(nc == supernode_client){
supernode_client = NULL;
display(nc,"!SuperNode Disconnected!");
}else
display(nc, "-Disconnected-");
break;
}
}
}
int main(int argc, char** argv) {
if(argc<=1){
printf("Enter server password : ");
scanf("%s",server_pwd);
}
else
strcpy(server_pwd,argv[1]);
struct mg_mgr mgr;
struct mg_connection *nc;
signal(SIGTERM, signal_handler);
signal(SIGINT, signal_handler);
setvbuf(stdout, NULL, _IOLBF, 0);
setvbuf(stderr, NULL, _IOLBF, 0);
mg_mgr_init(&mgr, NULL);
nc = mg_bind(&mgr, s_http_port, ev_handler);
mg_set_protocol_http_websocket(nc);
s_http_server_opts.document_root = "."; // Serve current directory
s_http_server_opts.enable_directory_listing = "no";
printf("Started on port %s\n", s_http_port);
while (s_signal_received == 0) {
mg_mgr_poll(&mgr, 200);
}
mg_mgr_free(&mgr);
return 0;
}