141 lines
2.8 KiB
C
141 lines
2.8 KiB
C
//#include <errno.h>
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//#include <netdb.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h> //sprintf
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// accept
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// atoi
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// bind
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// bzero
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// calloc
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// close
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// exit
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// free
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// listen
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// malloc
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// memset
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// realloc
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// recv
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// select
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// send
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// socket
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// sprintf
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// strcat
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// strcpy
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// strlen
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// strstr
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// write
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#define BUFSIZE 42000
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void error(char *str) {
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write(2, str, strlen(str));
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exit(1);
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}
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int init_socket(struct sockaddr_in *addr, int len, int port) {
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int server_fd;
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if ( (server_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
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error("Fatal error2\n");
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bzero(addr, len);
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addr->sin_family = AF_INET;
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addr->sin_addr.s_addr = htonl(2130706433); //127.0.0.1
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addr->sin_port = htons(port);
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if (bind(server_fd, (const struct sockaddr *)addr, len) == -1)
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error("Fatal error3\n");
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if (listen(server_fd, 10) == -1)
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error("Fatal error4\n");
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return server_fd;
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}
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void broadcast(char *buf, fd_set *set, int max_fd, int server_fd, int sender_fd) {
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for(int i = 0; i <= max_fd; ++i) {
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if (i == server_fd)
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continue;
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if (i == sender_fd)
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continue;
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if (FD_ISSET(i, set))
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send(i, buf, strlen(buf), 0);
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}
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}
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int main(int ac, char **av) {
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int port;
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int server_fd;
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int client_fd;
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int max_fd;
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int client_id;
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char buf[BUFSIZE];
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char tmpbuf[BUFSIZE];
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struct sockaddr_in addr;
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socklen_t addr_len;
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fd_set fdset;
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fd_set rdset;
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int clients[FD_SETSIZE];
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int ret;
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if (ac != 2)
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error("Wrong number of arguments\n");
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if ( (port = atoi(av[1])) == -1)
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error("Fatal error1\n");
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addr_len = sizeof(addr);
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server_fd = init_socket(&addr, addr_len, port);
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FD_ZERO(&fdset);
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FD_SET(server_fd, &fdset);
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max_fd = server_fd;
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client_id = 0;
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/*
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*/
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while (1) {
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rdset = fdset;
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select(max_fd + 1, &rdset, NULL, NULL, NULL);
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// new connection
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if (FD_ISSET(server_fd, &rdset)) {
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client_fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len);
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FD_SET(client_fd, &fdset);
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clients[client_fd] = client_id;
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if (client_fd > max_fd)
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max_fd = client_fd;
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sprintf(buf, "server: client %d just arrived\n", client_id);
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broadcast(buf, &fdset, max_fd, server_fd, client_fd);
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client_id++;
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}
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// new message
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client_fd = 0;
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while(client_fd <= max_fd) {
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ret = 1;
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if (FD_ISSET(client_fd, &rdset)) {
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bzero(buf, BUFSIZE);
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ret = recv(client_fd, buf, BUFSIZE, 0);
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if (ret == 0) {
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sprintf(buf, "server: client %d just left\n", clients[client_fd]);
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broadcast(buf, &fdset, max_fd, server_fd, client_fd);
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FD_CLR(client_fd, &fdset);
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}
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else if (ret > 0) {
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sprintf(tmpbuf, "client %d: %s", clients[client_fd], buf);
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broadcast(tmpbuf, &fdset, max_fd, server_fd, client_fd);
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}
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}
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client_fd++;
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}
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}
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return (0);
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}
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