a http client

http-client.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>

#include <sys/socket.h>
#include <sys/types.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>


bool http_request (const char* method,   const char*    path,
                   const char* hostname, unsigned short port);


int main (void){


  if(!http_request("GET", "/", "localhost", 80)){

    puts("an error ocourred :(");
    exit(EXIT_FAILURE);
  }

  return EXIT_SUCCESS;
}



bool http_request (const char* method,   const char*    path,
                   const char* hostname, unsigned short port){

  int    sock;
  struct hostent*    host;
  struct sockaddr_in dst;
  char*  buf;
  size_t bufsize;



  if((buf = (char *) malloc(2000)) == NULL){

    return false;
  }


  memset(&dst, 0, sizeof(dst));
  dst.sin_family      = AF_INET;
  dst.sin_port        = htons(port);


  // get IP address
  if((dst.sin_addr.s_addr = inet_addr(hostname)) == 0xffffffff){

    if((host = gethostbyname(hostname)) == NULL){

      return false;
    }

    memcpy(&dst.sin_addr, host->h_addr, host->h_length);
  }


  // create a socket
  if((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0){

    return false;
  }


  // connect to the server
  if(connect(sock, (struct sockaddr*) &dst, sizeof(dst)) == -1){

    return false;
  }


  // send request
  sprintf(buf, "%s %s HTTP/1.1\r\n", method, path);
  write(sock, buf, strlen(buf));

  sprintf(buf, "Host: %s\r\n", hostname);
  write(sock, buf, strlen(buf));

  sprintf(buf, "Connection: close\r\n");
  write(sock, buf, strlen(buf));

  write(sock, "\r\n", sizeof("\r\n"));


  // receive data
  for(;;){

    int sz;

    if((sz = read(sock, buf, 1000)) < 0)
      break;

    write(1, buf, sz); // Note: do not use printf
  }


  close(sock);

  return true;
}