118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
/* server-tcp.c
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* A server example using a TCP connection.
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*
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* Copyright (C) 2006-2020 wolfSSL Inc.
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*
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* This file is part of wolfSSL. (formerly known as CyaSSL)
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*
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* wolfSSL 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 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <sys/socket.h>
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#include <netinet/in.h>
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#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 <errno.h>
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#include <arpa/inet.h>
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#include <signal.h>
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#define MAXLINE 4096
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#define LISTENQ 1024
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#define SERV_PORT 11111
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/*
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* Fatal error detected, print out and exit.
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*/
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void err_sys(const char *err, ...)
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{
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printf("Fatal error : %s\n", err);
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}
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int main()
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{
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int listenfd, connfd;
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int opt;
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int n; /* length of string read */
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char buff[MAXLINE];
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char buf[MAXLINE]; /* string read from client */
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char response[22] = "I hear ya for shizzle";
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struct sockaddr_in cliAddr, servAddr;
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socklen_t cliLen;
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/* find a socket , 0 for using TCP option */
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listenfd = socket(AF_INET, SOCK_STREAM, 0);
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if (listenfd < 0) {
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err_sys("socket error");
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}
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/* set up server address and port */
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memset(&servAddr, 0, sizeof(servAddr));
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servAddr.sin_family = AF_INET;
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servAddr.sin_addr.s_addr = htonl(INADDR_ANY);
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servAddr.sin_port = htons(SERV_PORT);
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/* bind to a socket */
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opt = 1;
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setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, (const void*)&opt,
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sizeof(int));
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if (bind(listenfd, (struct sockaddr *) &servAddr, sizeof(servAddr)) < 0) {
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err_sys("bind error");
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}
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/* listen to the socket */
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if (listen(listenfd, LISTENQ) < 0) {
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err_sys("listen error");
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return 1;
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}
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/* main loop for accepting and responding to clients */
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for ( ; ; ) {
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cliLen = sizeof(cliAddr);
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connfd = accept(listenfd, (struct sockaddr *) &cliAddr, &cliLen);
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if (connfd < 0) {
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err_sys("accept error");
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break;
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}
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else {
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printf("Connection from %s, port %d\n",
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inet_ntop(AF_INET, &cliAddr.sin_addr, buff, sizeof(buff)),
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ntohs(cliAddr.sin_port));
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/* empty response buffer to avoid unexpected output */
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memset(buf, 0, MAXLINE);
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n = read(connfd, buf, MAXLINE);
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if (n > 0) {
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printf("%s\n", buf);
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if (write(connfd, response, 22) > 22) {
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err_sys("write error");
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}
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}
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if (n < 0) {
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err_sys("respond: read error");
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}
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/* closes the connections after responding */
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if (close(connfd) == -1) {
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err_sys("close error");
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break;
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}
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}
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}
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return 0;
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}
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