94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/*
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* client-udp.c
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*
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* Copyright (C) 2006-2015 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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*=============================================================================
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*
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* Bare-bones example of a UDP client for instructional/learning purposes.
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*/
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#include <wolfssl/options.h>
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#include <sys/socket.h>
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#include <arpa/inet.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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#define MAXLINE 4096
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#define SERV_PORT 11111
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void DatagramClient(FILE* clientInput, int sockfd,
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const struct sockaddr* servAddr, socklen_t servLen);
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/* send and recieve message function */
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void DatagramClient (FILE* clientInput, int sockfd,
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const struct sockaddr* servAddr, socklen_t servLen)
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{
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int n;
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char sendLine[MAXLINE], recvLine[MAXLINE +1];
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while (fgets(sendLine, MAXLINE, clientInput) != NULL) {
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if ( ( sendto(sockfd, sendLine, strlen(sendLine) - 1, 0, servAddr,
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servLen)) == -1) {
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printf("error in sending");
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}
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if ( (n = recvfrom(sockfd, recvLine, MAXLINE, 0, NULL, NULL)) == -1) {
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printf("Error in receiving");
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}
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recvLine[n] = '\0';
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fputs(recvLine, stdout);
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}
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}
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int main(int argc, char** argv)
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{
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int sockfd;
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struct sockaddr_in servAddr;
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if (argc != 2) {
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printf("usage: udpcli <IP address>\n");
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return 1;
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}
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if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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printf("cannot create a socket.");
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return 1;
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}
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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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inet_pton(AF_INET, argv[1], &servAddr.sin_addr);
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DatagramClient(stdin, sockfd, (struct sockaddr*) &servAddr,
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sizeof(servAddr));
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return 0;
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}
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