server-client-network/ClientMain.c

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include "Client.h"
#include "String.h"

Client client;

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

int isSpecialFolder(char* folder)
{
    return strcmp(folder, ".") == 0 || strcmp(folder, "..") == 0;
}

int readNumber(const char* text)
{
    while(1)
    {
        int number;
        printf("%s", text);
        int result = scanf("%d", &number);
        char c = getchar();
        while(c != EOF && c != '\n')
        {
            c = getchar();
        }
        
        if(result != 0)
        {
            return number;
        }
    }
    return -1;
}

void waitForData()
{
    while(1)
    {
        printf("Type a command:\n");
        String s;
        stringInit(&s);
        stringRead(&s);
        
        if(stringCompareNoCase(&s, "SEND"))
        {
            printf("Sending a mail to the server...\n");
            
            //outgoing stream
            Stream out;
            streamInit(&out, 128);
            streamWriteInt(&out, 0);
            
            // 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 || isSpecialFolder(receiver.data))
            {
                printf("Please type a valid receiver: ");
                stringRemove(&receiver);
                stringInit(&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: ");
                stringRemove(&subject);
                stringInit(&subject);
                stringRead(&subject);
                l = stringGetLength(&subject);
            }
            streamWriteChars(&out, subject.data);
            streamWriteChar(&out, '\n');
            stringRemove(&subject);
            
            // message
            printf("Type a message: ");
            String message;
            stringInit(&message);
            stringRead(&message);
            streamWriteChars(&out, message.data);
            streamWriteChars(&out, "\n.\n");
            stringRemove(&message);
            
            // send and clear stream
            clientSendData(&client, &out);
            streamRemove(&out);
        }
        else if(stringCompareNoCase(&s, "LIST"))
        {
            //outgoing stream
            Stream out;
            streamInit(&out, 16);
            streamWriteInt(&out, 1);
            
            // send and clear stream
            clientSendData(&client, &out);
            streamRemove(&out);
        }
        else if(stringCompareNoCase(&s, "READ"))
        {
            //outgoing stream
            Stream out;
            streamInit(&out, 16);
            streamWriteInt(&out, 2);
            
            // message number
            int number = readNumber("Type a message number: ");
            streamWriteInt(&out, number);
            streamWriteChar(&out, '\n');
            
            // send and clear stream
            clientSendData(&client, &out);
            streamRemove(&out);
        }
        else if(stringCompareNoCase(&s, "DEL"))
        {
            //outgoing stream
            Stream out;
            streamInit(&out, 16);
            streamWriteInt(&out, 3);
            
            // message number
            int number = readNumber("Type a message number: ");
            streamWriteInt(&out, number);
            streamWriteChar(&out, '\n');
            
            // send and clear stream
            clientSendData(&client, &out);
            streamRemove(&out);
        }
        else if(stringCompareNoCase(&s, "QUIT"))
        {
            Stream out;
            streamInit(&out, 16);
            streamWriteInt(&out, 4);
            clientSendData(&client, &out);
            streamRemove(&out);
        }
        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: disconnects your from the server\n");
        }
        else if(stringCompareNoCase(&s, "LOGIN"))
        {
            //outgoing stream
            Stream out;
            streamInit(&out, 16);
            streamWriteInt(&out, 5);
            
            // 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: ");
                stringRemove(&sender);
                stringInit(&sender);
                stringRead(&sender);
                l = stringGetLength(&sender);
            }
            streamWriteChars(&out, sender.data);
            streamWriteChar(&out, '\n');
            stringRemove(&sender);
            
            // password
            printf("Type a password: ");
            String password;
            stringInit(&password);
            stringRead(&password);
            l = stringGetLength(&password);
            while(l == 0)
            {
                printf("Please type a valid password: ");
                stringRemove(&password);
                stringInit(&password);
                stringRead(&password);
                l = stringGetLength(&password);
            }
            streamWriteChars(&out, password.data);
            streamWriteChar(&out, '\n');
            stringRemove(&sender);
            
            // send and clear stream
            clientSendData(&client, &out);
            streamRemove(&out);
        }
        
        stringRemove(&s);
    }
}

void packageAnswer(Stream* in)
{
    char buffer[32];
    streamGetChars(in, buffer, 32);
    printf("%s\n", buffer);
    
    printf("Type a command:\n");
}

void packageList(Stream* in)
{
    int number;
    if(streamGetInt(in, &number) == -1)
    {
        return;
    }
    if(number == 1)
    {
        printf("\nYou have %d mail.\n", number);
    }
    else
    {
        printf("\nYou have %d mails.\n", number);
    }
    
    char c;
    while(streamGetChar(in, &c) != -1)
    {
        fputc(c, stdout);
    }
    fputc('\n', stdout);
    
    printf("Type a command: \n");
}

void packageReadDel(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, packageAnswer);
    clientRegisterHandler(&client, packageList);
    clientRegisterHandler(&client, packageReadDel);

    waitForData();

    clientRemove(&client);
    return EXIT_SUCCESS;
}