274 lines
9.6 KiB
C
274 lines
9.6 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include "../../deps/jsmn/jsmn.h"
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struct chat_msg {
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char nick[16];
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char bbstag[16];
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char msg[256];
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};
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struct client {
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char bbstag[16];
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char nick[16];
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int fd;
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};
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struct client **clients;
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int client_count = 0;
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typedef enum { START, KEY, PRINT, SKIP, STOP } parse_state;
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static int jsoneq(const char *json, jsmntok_t *tok, const char *s) {
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if (tok->type == JSMN_STRING && (int) strlen(s) == tok->end - tok->start &&
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strncmp(json + tok->start, s, tok->end - tok->start) == 0) {
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return 0;
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}
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return -1;
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}
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int main(int argc, char **argv) {
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int port;
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int server_socket;
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struct sockaddr_in server, client;
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fd_set master, read_fds;
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int fdmax;
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int c;
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int new_fd;
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struct chat_msg msg;
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int i, j, k;
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char buffer[1024];
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char buf[1024];
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char motd[256];
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jsmn_parser parser;
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jsmntok_t tokens[8];
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int r;
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int nbytes;
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FILE *fptr;
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if (argc < 2) {
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printf("Usage: magichat [port]\n");
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return 0;
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}
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port = atoi(argv[1]);
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if (port <= 1024 && port > 65535) {
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printf("Invalid port number, must be between 1024 - 65535\n");
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return 0;
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}
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server_socket = socket(AF_INET, SOCK_STREAM, 0);
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if (server_socket == -1) {
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fprintf(stderr, "Couldn't create socket..\n");
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exit(1);
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}
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server.sin_family = AF_INET;
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server.sin_addr.s_addr = INADDR_ANY;
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server.sin_port = htons(port);
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if (bind(server_socket, (struct sockaddr *)&server, sizeof(server)) < 0) {
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perror("Bind Failed, Error\n");
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exit(1);
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}
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listen(server_socket, 3);
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FD_ZERO(&master);
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FD_SET(server_socket, &master);
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fdmax = server_socket;
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c = sizeof(struct sockaddr_in);
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while (1) {
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read_fds = master;
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if (select(fdmax+1, &read_fds, NULL, NULL, NULL) == -1) {
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perror("select");
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exit(-1);
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}
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for(i = 0; i <= fdmax; i++) {
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if (FD_ISSET(i, &read_fds)) {
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if (i == server_socket) {
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new_fd = accept(server_socket, (struct sockaddr *)&client, (socklen_t *)&c);
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if (new_fd == -1) {
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perror("accept");
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} else {
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if (client_count == 0) {
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clients = (struct client **)malloc(sizeof(struct client *));
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} else {
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clients = (struct client **)realloc(clients, sizeof(struct client *) * (client_count + 1));
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}
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if (!clients) {
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fprintf(stderr, "Out of memory!\n");
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return -1;
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}
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clients[client_count] = (struct client *)malloc(sizeof(struct client));
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if (!clients[client_count]) {
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fprintf(stderr, "Out of memory!\n");
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return -1;
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}
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sprintf(clients[client_count]->bbstag, "UNKNOWN");
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sprintf(clients[client_count]->nick, "UNKNOWN");
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clients[client_count]->fd = new_fd;
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client_count++;
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FD_SET(new_fd, &master);
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if (new_fd > fdmax) {
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fdmax = new_fd;
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}
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}
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} else {
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if ((nbytes = recv(i, buf, sizeof buf, 0)) <= 0) {
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for (k=0;k<client_count;k++) {
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if (clients[k]->fd == i) {
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if (strcmp(clients[k]->nick, "UNKNOWN") != 0) {
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snprintf(buffer, 1024, "{\"bbs\": \"SYSTEM\", \"nick\": \"SYSTEM\", \"msg\": \"%s (%s) has left the chat\" }\n", clients[k]->nick, clients[k]->bbstag);
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for (j=0;j<=fdmax;j++) {
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if (FD_ISSET(j, &master)) {
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if (j != server_socket && j != clients[k]->fd) {
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if (send(j, buffer, strlen(buffer), 0) == -1) {
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perror("send");
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}
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}
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}
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}
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}
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free(clients[k]);
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for (j=k;j<client_count-1;j++) {
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clients[j] = clients[j+1];
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}
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client_count--;
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if (client_count == 0) {
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free(clients);
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} else {
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clients = realloc(clients, sizeof(struct client) * (client_count));
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}
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}
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}
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close(i); // bye!
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FD_CLR(i, &master); // remove from master set
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} else {
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// we got some data from a client
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jsmn_init(&parser);
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r = jsmn_parse(&parser, buf, nbytes, tokens, sizeof(tokens)/sizeof(tokens[0]));
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if (r < 0) {
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continue;
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}
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if (r < 1 || tokens[0].type != JSMN_OBJECT) {
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continue;
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}
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for (j = 1; j < r; j++) {
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if (jsoneq(buf, &tokens[j], "bbs") == 0) {
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snprintf(msg.bbstag, 16, "%.*s", tokens[j+1].end-tokens[j+1].start, buf + tokens[j+1].start);
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j++;
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}
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if (jsoneq(buf, &tokens[j], "nick") == 0) {
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snprintf(msg.nick, 16, "%.*s", tokens[j+1].end-tokens[j+1].start, buf + tokens[j+1].start);
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j++;
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}
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if (jsoneq(buf, &tokens[j], "msg") == 0) {
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snprintf(msg.msg, 256, "%.*s", tokens[j+1].end-tokens[j+1].start, buf + tokens[j+1].start);
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j++;
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}
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}
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if (strcmp(msg.msg, "LOGIN") == 0) {
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for (j=0;j<client_count;j++) {
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if (clients[j]->fd == i) {
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if (strcmp(clients[j]->nick, "UNKNOWN") == 0) {
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strncpy(clients[j]->bbstag, msg.bbstag, 16);
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strncpy(clients[j]->nick, msg.nick, 16);
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clients[j]->bbstag[15] = '\0';
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clients[j]->nick[15] = '\0';
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for(k = 0; k < client_count; k++) {
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if (i != clients[k]->fd && strcmp(clients[k]->nick, "UNKNOWN") != 0) {
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snprintf(buffer, 1024, "{\"bbs\": \"SYSTEM\", \"nick\": \"SYSTEM\", \"msg\": \"%s (%s) has joined the chat\" }\n", clients[j]->nick, clients[j]->bbstag);
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if (send(clients[k]->fd, buffer, strlen(buffer), 0) == -1) {
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perror("send");
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}
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}
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}
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fptr = fopen("motd.txt", "r");
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if (fptr) {
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fgets(motd, 256, fptr);
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while (!feof(fptr)) {
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if (motd[strlen(motd) - 1] == '\n') {
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motd[strlen(motd) - 1] = '\0';
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}
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if (strlen(motd) == 0) {
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sprintf(motd, " ");
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}
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snprintf(buffer, 1024, "{\"bbs\": \"SYSTEM\", \"nick\": \"SYSTEM\", \"msg\": \"%s\" }\n", motd);
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if (send(i, buffer, strlen(buffer), 0) == -1) {
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perror("send");
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}
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fgets(motd, 256, fptr);
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}
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fclose(fptr);
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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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} else if (strcmp(msg.msg, "USERS") == 0) {
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for (j=0;j<client_count;j++) {
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if (strcmp(clients[j]->nick, "UNKNOWN") != 0) {
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snprintf(buffer, 1024, "{\"bbs\": \"SYSTEM\", \"nick\": \"SYSTEM\", \"msg\": \"(%s)[%s] is online.\" }\n", clients[j]->bbstag, clients[j]->nick);
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if (send(i, buffer, strlen(buffer), 0) == -1) {
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perror("send");
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}
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}
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}
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} else {
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for (j=0;j<client_count;j++) {
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if (clients[j]->fd == i) {
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if (strcmp(clients[j]->nick, "UNKNOWN") != 0) {
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for(k = 0; k < client_count; k++) {
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if (i != clients[k]->fd && strcmp(clients[k]->nick, "UNKNOWN") != 0) {
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if (send(clients[k]->fd, buf, nbytes, 0) == -1) {
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perror("send");
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}
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}
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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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}
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}
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}
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}
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}
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}
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