105 lines
3.0 KiB
C
105 lines
3.0 KiB
C
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/* client-tcp.c
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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> /* basic socket definitions */
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#include <netinet/in.h> /* sockaddr_in{} and other Internet defns */
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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 <errno.h>
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#include <arpa/inet.h>
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#include <signal.h>
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#include <unistd.h>
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#define MAXLINE 256 /* max text line length */
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#define SERV_PORT 11111
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/*
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* this function will send the inputted string to the server and then
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* receive the string from the server outputing it to the terminal
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*/
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int main(int argc, char **argv)
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{
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int sockfd, ret;
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char sendline[MAXLINE]="Hello Server"; /* string to send to the server */
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char recvline[MAXLINE]; /* string received from the server */
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struct sockaddr_in servaddr;
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/* must include an ip address or this will flag */
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if (argc != 2) {
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printf("Usage: tcpClient <IPaddress>\n");
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return -1;
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}
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/* create a stream socket using tcp,internet protocal IPv4,
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* full-duplex stream */
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sockfd = socket(AF_INET, SOCK_STREAM, 0);
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/* places n zero-valued bytes in the address servaddr */
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memset(&servaddr, 0, sizeof(servaddr));
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servaddr.sin_family = AF_INET;
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servaddr.sin_port = htons(SERV_PORT);
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/* converts IPv4 addresses from text to binary form */
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ret = inet_pton(AF_INET, argv[1], &servaddr.sin_addr);
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if (ret != 1) {
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printf("Not a Valid network address");
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return -1;
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}
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/* attempts to make a connection on a socket */
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ret = connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr));
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if (ret != 0) {
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ret = -1;
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goto exit;
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}
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/* takes inputting string and outputs it to the server */
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/* write string to the server */
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if (write(sockfd, sendline, strlen(sendline)) != strlen(sendline)) {
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printf("Write Error to Server\n");
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ret = -1;
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goto exit;
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}
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/* flags if the server stopped before the client could end */
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if (read(sockfd, recvline, MAXLINE) == 0) {
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printf("Client: Server Terminated Prematurely!\n");
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ret = -1;
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goto exit;
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}
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printf("Server Message: %s\n", recvline);
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ret = 0;
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exit:
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/* close socket and connection */
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close(sockfd);
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return ret;
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}
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