server-client-network/ClientMain.c

#define	_POSIX_C_SOURCE 1
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include "Client.h"
#include "String.h"
#include <termios.h>

Client client;

void interruptHandler(int signal)
{
    clientRemove(&client);
    exit(EXIT_SUCCESS);
}

void toggleTerminalPrinting()
{
    struct termios old, new;
    if(tcgetattr(fileno(stdin), &old) != 0)
    {
        return;
    }
    new = old;
    new.c_lflag ^= ECHO;
    if(tcsetattr(fileno(stdin), TCSAFLUSH, &new) != 0)
    {
        return;
    }
}

void writeMessageNumber(Stream* out)
{
    String number;
    stringInit(&number);
    printf("Type a message identifier: ");
    stringRead(&number);
    streamWriteChars(out, number.data);
    streamWriteChar(out, '\n');
    stringRemove(&number);
}

void waitForData()
{
    String s;
    stringInit(&s);
    while(1)
    {
        printf("Type a command:\n");
        stringRead(&s);
        
        if(stringCompareNoCase(&s, "SEND"))
        {
            printf("Sending a mail to the server...\n");
            
            //outgoing stream
            Stream out;
            streamInit(&out, 128);
            streamWriteChars(&out, "SEND\n");
            
            // receiver
            printf("Type a receiver with at most 8 characters: ");
            String receiver;
            stringInit(&receiver);
            stringRead(&receiver);
            int l = stringGetLength(&receiver);
            while(l < 1 || l > 8 || stringCompare(&receiver, ".") || stringCompare(&receiver, ".."))
            {
                printf("Please type a valid receiver: ");
                stringRead(&receiver);
                l = stringGetLength(&receiver);
            }
            streamWriteChars(&out, receiver.data);
            streamWriteChar(&out, '\n');
            stringRemove(&receiver);
            
            // subject
            printf("Type a subject with at most 80 characters: ");
            String subject;
            stringInit(&subject);
            stringRead(&subject);
            l = stringGetLength(&subject);
            while(l < 1 || l > 80)
            {
                printf("Please type a valid subject: ");
                stringRead(&subject);
                l = stringGetLength(&subject);
            }
            streamWriteChars(&out, subject.data);
            streamWriteChar(&out, '\n');
            stringRemove(&subject);
            
            // message
            String message;
            stringInit(&message);
            while(1)
            {
                printf("Type a message: ");
                stringRead(&message);
                if(stringCompare(&message, "."))
                {
                    streamWriteChars(&out, ".\n");
                    break;
                }
                streamWriteChars(&out, message.data);
                streamWriteChar(&out, '\n');
            }
            stringRemove(&message);
            
            // send and clear stream
            clientSendData(&client, &out);
            streamRemove(&out);
        }
        else if(stringCompareNoCase(&s, "LIST"))
        {
            //outgoing stream
            Stream out;
            streamInit(&out, 16);
            streamWriteChars(&out, "LIST\n");
            
            // send and clear stream
            clientSendData(&client, &out);
            streamRemove(&out);
        }
        else if(stringCompareNoCase(&s, "READ"))
        {
            //outgoing stream
            Stream out;
            streamInit(&out, 16);
            streamWriteChars(&out, "READ\n");
            
            // message number
            writeMessageNumber(&out);
            
            // send and clear stream
            clientSendData(&client, &out);
            streamRemove(&out);
        }
        else if(stringCompareNoCase(&s, "DEL"))
        {
            //outgoing stream
            Stream out;
            streamInit(&out, 16);
            streamWriteChars(&out, "DEL\n");
            
            // message number
            writeMessageNumber(&out);
            
            // send and clear stream
            clientSendData(&client, &out);
            streamRemove(&out);
        }
        else if(stringCompareNoCase(&s, "QUIT"))
        {
            break;
        }
        else if(stringCompareNoCase(&s, "HELP"))
        {
            printf("- LOGIN: log in at the server\n");
            printf("- SEND: sends a message to a receiver\n");
            printf("- LIST: shows all your mails\n");
            printf("- READ: read a mail\n");
            printf("- DEL: delete a mail\n");
            printf("- QUIT: close this program\n");
        }
        else if(stringCompareNoCase(&s, "LOGIN"))
        {
            //outgoing stream
            Stream out;
            streamInit(&out, 16);
            streamWriteChars(&out, "LOGIN\n");
            
            // user
            printf("Type a user with at most 8 characters: ");
            String sender;
            stringInit(&sender);
            stringRead(&sender);
            int l = stringGetLength(&sender);
            while(l < 1 || l > 8)
            {
                printf("Please type a valid user: ");
                stringRead(&sender);
                l = stringGetLength(&sender);
            }
            streamWriteChars(&out, sender.data);
            streamWriteChar(&out, '\n');
            stringRemove(&sender);
            
            // password
            printf("Type a password: ");
            String password;
            stringInit(&password);
            toggleTerminalPrinting();
            stringRead(&password);
            toggleTerminalPrinting();
            l = stringGetLength(&password);
            while(l == 0)
            {
                printf("Please type a valid password: ");
                toggleTerminalPrinting();
                stringRead(&password);
                toggleTerminalPrinting();
                l = stringGetLength(&password);
            }
            streamWriteChars(&out, password.data);
            streamWriteChar(&out, '\n');
            stringRemove(&password);
            
            // send and clear stream
            clientSendData(&client, &out);
            streamRemove(&out);
        }
    }
    stringRemove(&s);
}

void package(Stream* in)
{
    char c;
    while(streamGetChar(in, &c) != -1)
    {
        fputc(c, stdout);
    }
    fputc('\n', stdout);
    
    printf("Type a command:\n");
}

int main(int argc, char** argv)
{
    if(argc < 3)
    {
        printf("Usage: %s server_address port\n", argv[0]);
        return EXIT_FAILURE;
    }
    
    int port = atoi(argv[2]);
    if(port <= 0 || port >= 65536)
    {
        printf("invalid port");
        return EXIT_FAILURE;
    }
    
    clientInitDefaults(&client);
    
    signal(SIGINT, interruptHandler);
    signal(SIGKILL, interruptHandler);
    
    if(clientInit(&client, argv[1], port) == -1)
    {
        return EXIT_FAILURE;
    }
    
    clientRegisterHandler(&client, package);

    waitForData();

    clientRemove(&client);
    return EXIT_SUCCESS;
}