server

/* The port number is passed as an argument */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
//#include <netinet/in.h>
#include <arpa/inet.h>
#include <iostream>
#include <sys/wait.h>
#include <signal.h>
#include <sstream>
#include <fstream>


#define RCVBUFSIZE 50 /* Size of receive buffer */
using namespace std;

void error(const char *msg)
{
    perror(msg);
    exit(1);
}

void get(int clntSocket, string fileName) {
    /*sending protocol of files
     * check if the file is found and send response
     * if found send the file as arrays
     */
    FILE *file = fopen(fileName.c_str(), "rb");
    if (file == NULL) {//file not found

        string s = "HTTP/1.0 404 Not Found\r\n";
        char buffer[s.size() + 1];
        strncpy(buffer, s.c_str(), sizeof(buffer));
        buffer[sizeof(buffer) - 1] = 0;
        send(clntSocket, buffer, sizeof(buffer), 0);

        return;
    }

    //file found
    string s = "HTTP/1.0 200 OK\r\n";
    char buffer[1024];
    strncpy(buffer, s.c_str(), sizeof(buffer));
    buffer[sizeof(buffer)-1] = 0;
    if (send(clntSocket, buffer, sizeof(buffer), 0) != sizeof(buffer))
        error("send() failed");
    int read_size;
    char send_buffer[1024];
    while (!feof(file)) {
        read_size = fread(send_buffer, 1, 1024 , file);
        cout<<read_size<<endl;
        if (send(clntSocket, send_buffer, read_size, 0) != read_size)
            error("send() failed");
    }
    fclose(file);
}

void post(int clntSocket, string fileName) {
    //create file with fileName
    FILE* file=fopen(fileName.c_str(), "wb");
    int recv_size;
    char buffer[1024];
    if ((recv_size = recv(clntSocket, buffer, sizeof(buffer), 0)) < 0)
                error("recv() failed");
    while (recv_size > 0) {
        fwrite(buffer, 1, recv_size, file);
        if ((recv_size = recv(clntSocket, buffer, sizeof(buffer), 0)) < 0)
            error("recv() failed");
    }
    fclose(file);
}

void HandleTCPClient(int clntSocket) {
    char echoBuffer[RCVBUFSIZE];
    int recvMsgSize;
    /* Buffer for echo string */
    /* Size of received message */
    /* Receive message from client */
    if ((recvMsgSize = recv(clntSocket, echoBuffer, RCVBUFSIZE, 0)) < 0)
        error("recv() failed");
    cout<<echoBuffer<<endl;
    //split the message and find the method and the fileName
    istringstream iss(echoBuffer);
    string type, fileName;
    iss >> type;
    iss >> fileName;
    cout << "type: " << type << endl;
    cout << "filename: " << fileName << endl;
    if (type == "GET" || type == "get")
        get(clntSocket, fileName);
    else if(type == "POST" || type == "post")
        post(clntSocket, fileName);
    else
        error("incorrect type");
    //close(clntSocket); /* Close client socket */
}


void sigchld_handler(int s)
{
    while(wait(NULL) > 0);
}

int main(int argc, char *argv[])
{
     int sockfd, newsockfd, portno;
     socklen_t clilen;
     char buffer[256];
     struct sockaddr_in serv_addr, cli_addr;
     int n;
     struct sigaction sa;
     /*if (argc < 2) {
         fprintf(stderr,"ERROR, no port provided\n");
         exit(1);
     }*/

     sockfd =  socket(AF_INET, SOCK_STREAM, 0);
     if (sockfd < 0)
        error("ERROR opening socket");

     bzero((char *) &serv_addr, sizeof(serv_addr));

     //portno = atoi(argv[1]);
     portno = 5000;

     serv_addr.sin_family = AF_INET;

     serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1"); //*/*//

     serv_addr.sin_port = htons(portno);

     if (bind(sockfd, (struct sockaddr *) &serv_addr,
              sizeof(serv_addr)) < 0)
              error("ERROR on binding");

     if (listen(sockfd,5) < 0)
        error("ERROR on listening");

    sa.sa_handler = sigchld_handler; // reap all dead processes
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = SA_RESTART;
    if (sigaction(SIGCHLD, &sa, NULL) == -1)
    {
        perror("sigaction");
        exit(1);
    }

    while(1) {
     // The accept() call actually accepts an incoming connection
     clilen = sizeof(cli_addr);
    cout << "before accept"<<endl;
     if ((newsockfd = accept(sockfd,(struct sockaddr *) &cli_addr, &clilen)) < 0)
     {
     continue;
          //error("ERROR on accept");
     }
      cout << "connections was found"<< endl;
    if (!fork())
        { // this is the child process
            close(sockfd); // child doesn.t need the listener
            HandleTCPClient(newsockfd);
            close(newsockfd);
            exit(0);
        }
    close(newsockfd); // parent doesn.t need this
    }
     return 0;
}