Socket tips: UDP Echo service

#include <stdio.h>#include <stdlib.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <netdb.h>#include <time.h>#define BUFFER_LENGTH 1024void ReverseMessage(char buffer[], ssize_t receivedBytesCount);void ExitWithMessage(const int errorCode, const char * errorMessage){    fprintf(stderr, "\n\nError Msg  : %s\n", errorMessage);    fprintf(stderr, "Error Code : 0x%X\n", errorCode);    fprintf(stderr, "Location   : %s: %d\n\n", __FILE__, __LINE__);    exit(errorCode);}void PrintIPv4(unsigned long ipvalue, FILE * stream){    uint8_t a;    uint8_t b;    uint8_t c;    uint8_t d;    a = ipvalue >> 24;    ipvalue -= a * 0x01000000;    b = ipvalue >> 16;    ipvalue -= b * 0x00010000;    c = ipvalue >> 8;    ipvalue -= c * 0100000100;    d = ipvalue;    fprintf(stream, "%d.%d.%d.%d", d, c, b, a);}void PrintSocketAddress(const struct sockaddr * address, FILE * stream){    struct in_addr ip4addr;    in_port_t port;    struct sockaddr_in * ipv4Address;    if(address == NULL || stream == NULL)    {        return;    }    //printf("sa_family: %d\n", address->sa_family);    switch(address->sa_family)    {        case AF_INET:            fputs("[IPv4] ", stream);            ipv4Address = (struct sockaddr_in *)address;            ip4addr = ipv4Address->sin_addr;            port = ntohs(ipv4Address->sin_port);            //fprintf(stream, "ip4addr.s_addr: %X\n", ip4addr.s_addr);            PrintIPv4(ip4addr.s_addr, stream);            fprintf(stream, " : %d", port);            break;        case AF_INET6:            fputs("[IPv6] ", stream);            break;        default:            fputs("[unknown type]", stream);            return;    }}void PrintTime(FILE * stream){    time_t currentTime;    struct tm * local_time;    struct timeval tv;    currentTime = time(0);    local_time = localtime(¤tTime);    gettimeofday(&tv);    fprintf(stream, "%04d-%02d-%02d %02d:%02d:%02d.%03d",            local_time->tm_year + 1900,            local_time->tm_mon + 1,            local_time->tm_mday,            local_time->tm_hour,            local_time->tm_min,            local_time->tm_sec,            tv.tv_usec / 1000);}int main(int argc, char * argv[]){    char * serverPortString;    struct addrinfo addrCriteria;    struct addrinfo *serverAddr;    int socketHandle;    int returnValue;    struct sockaddr_storage clientAddr;    socklen_t clientAddrLen = sizeof(struct sockaddr);    char buffer[BUFFER_LENGTH];    ssize_t receivedBytesCount;    ssize_t sendBytesCount;    if(argc != 2)    {        //ExitWithMessage(0xF001, "Need parameter: <Server_Port>");        serverPortString = "2001";    }    else    {        // First argument: local port        serverPortString = argv[1];    }    memset(&addrCriteria, 0, sizeof(struct addrinfo));    addrCriteria.ai_family = AF_UNSPEC; // Any address family    addrCriteria.ai_flags = AI_PASSIVE; // Accept on any address/port    addrCriteria.ai_socktype = SOCK_DGRAM; // only datagram socket    addrCriteria.ai_protocol = IPPROTO_UDP; // only UDP socket    returnValue = getaddrinfo(NULL, serverPortString, &addrCriteria, &serverAddr);    if(returnValue != 0)    {        fprintf(stderr, "getaddrinfo() failed.\n");        ExitWithMessage(returnValue, gai_strerror(returnValue));    }    // Create socket for incomming connections    socketHandle = socket(serverAddr->ai_family, serverAddr->ai_socktype, serverAddr->ai_protocol);    if(socketHandle < 0)    {        fprintf(stderr, "socket() failed.\n");        ExitWithMessage(socketHandle, gai_strerror(socketHandle));    }    // Bind to local address    returnValue = bind(socketHandle, serverAddr->ai_addr, serverAddr->ai_addrlen);    if(returnValue < 0)    {        fprintf(stderr, "bind() failed.\n");        ExitWithMessage(returnValue, gai_strerror(returnValue));    }    // Free address list allocated by getaddrinfo    freeaddrinfo(serverAddr);    printf("Starting the UDP Server ...\n");    printf("Listinning at port %s\n\n", serverPortString);    while(1)    {        receivedBytesCount = recvfrom(socketHandle,buffer,BUFFER_LENGTH,0,(struct sockaddr *)&clientAddr,&clientAddrLen);        // printf("Received %d bytes.\n", receivedBytesCount);        if(receivedBytesCount < 0)        {            fprintf(stderr, "recvfrom() failed.\n");            ExitWithMessage(receivedBytesCount, gai_strerror(receivedBytesCount));        }        fputs("Handling client ", stdout);        PrintSocketAddress((struct sockaddr *)&clientAddr, stdout);        fputs(" at ", stdout);        PrintTime(stdout);        fputc('\n', stdout);        buffer[receivedBytesCount] = '\0';        fputs("Message: ", stdout);        fputs(buffer, stdout);        fputs("\n\n", stdout);ReverseMessage(buffer, receivedBytesCount);        sendBytesCount = sendto(socketHandle, buffer, receivedBytesCount, 0, (struct sockaddr *)&clientAddr, sizeof(clientAddr));        if(sendBytesCount < 0)        {            fprintf(stderr, "sendto() failed.\n");            ExitWithMessage(sendBytesCount, gai_strerror(sendBytesCount));        }    }    return 0;}void ReverseMessage(char buffer[], ssize_t receivedBytesCount){ssize_t i;ssize_t j;char temp;for(i = 0; i < receivedBytesCount / 2; i++){j = receivedBytesCount - 1 - i;temp = buffer[i];buffer[i] = buffer[j];buffer[j] = temp;}}