127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
/*
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Author: Jozef Simko
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School year: 3., Bachelor study, 2021/22
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Study program: Computer Networks
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Organization: Technical University of Kosice (TUKE), Faculty of Electrical Engineering and Informatics (FEI),
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Compiler: Winlibs GCC -- MinGW-W64 x86_64-posix-seh version 11.2.0, built by Brecht Sanders (OS Win)
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-- gcc version 9.3.0 (OS Linux)
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compile: WIN -- gcc client.c -Wall -Wextra -lwsock32 -o client
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LINUX -- gcc server.c -Wall -Wextra -o server
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version: 1.2 , 15.5.2021
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Usage: This demo demonstrates simple way of using Socket API and loading measurements from our server.
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Results are compared with MAX and MIN value - be careful on used units.
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*/
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#ifdef _WIN32
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#define WIN32_LEAN_AND_MEAN
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#include <winsock2.h>
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#else
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <unistd.h>
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#endif
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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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/* Defines lenght of buffer for server's messages
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It's better to use higher values, it's helpful in case of hardware/network overload */
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#define REPLY_MSG_SIZE 2048
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/* Defines public or local IP address of server in decimal form */
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#define IP_ADDRESS "192.168.0.101"
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/* Defines port used by server */
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#define PORT 32500
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/* MAX & MIN values are used to compare measurement result
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Values should be adjusted to the used units (check server config file) */
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#define MAX_VALUE 1265
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#define MIN_VALUE 1200
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/*
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Closes socket (with dependency on used OS)
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*/
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void cleanUP(int sock){
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#ifdef WIN32
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closesocket(sock);
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WSACleanup();
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#else
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close(sock);
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#endif
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return;
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}
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/* ====================================================== */
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int main(){
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int sock;
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struct sockaddr_in server;
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char server_reply[REPLY_MSG_SIZE];
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#ifdef WIN32
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WSADATA wsaData;
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int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
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if (iResult != 0){
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printf("WSASturtup() failed %d\n", iResult);
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return 1;
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}
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#endif
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if ((sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0){
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printf("socket() failed\n");
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cleanUP(sock);
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return 1;
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}
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memset(&server, 0, sizeof(server));
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server.sin_family = AF_INET;
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server.sin_addr.s_addr = inet_addr(IP_ADDRESS);
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server.sin_port = htons(PORT);
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if (connect(sock, (struct sockaddr *) &server, sizeof(server)) != 0){
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printf("Cannot connect to server - check IP, port and server status!\n");
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cleanUP(sock);
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return 1;
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}
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if(recv(sock, server_reply, 2, 0) <= 0){
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printf("Connection interrupted! Check server status!\n");
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cleanUP(sock);
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return 1;
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}
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while(1){
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memset(server_reply, 0, REPLY_MSG_SIZE);
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if(recv(sock, server_reply, REPLY_MSG_SIZE, 0) <= 0){
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printf("Server crushed or disconnected!\n");
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cleanUP(sock);
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return 1;
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}
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if(strcmp(server_reply, "%") == 0){
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break;
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}
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char *rest = server_reply;
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for(int i = 0; i < 3; i++){
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strtok_r(rest, ":", &rest);
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}
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double result = strtof(rest, NULL);
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if(result > MAX_VALUE){
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printf("Distance out of range - too great (%0.2f)\n", result);
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}
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if(result < MIN_VALUE){
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printf("Distance out of range - too low (%0.2f)\n", result);
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}
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}
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cleanUP(sock);
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return 0;
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}
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