# C HTTP client

Introduction

HTTP client that does a head request to the server indicated as first argument.
Note: 209.85.146.99 == 0xd1559263 == 3512046179

Code and example

# cat httpclient.c
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>

int main(int argc,char *argv[]){
 struct addrinfo server_hints;
 struct addrinfo *server_result;
 memset(&server_hints,0,sizeof(struct addrinfo));
 server_hints.ai_family=AF_UNSPEC;
 server_hints.ai_socktype=SOCK_STREAM;
 server_hints.ai_protocol=0;
 int sfd,s;
 printf("%s\n",argv[1]);
 s=getaddrinfo(argv[1],"80",&server_hints,&server_result);
 if(s==0){
  sfd=socket(server_result->ai_family,server_result->ai_socktype,server_result->ai_protocol);
  if(sfd>0){
   struct timeval timeout;
   timeout.tv_sec=0;
   timeout.tv_usec=500000;
   setsockopt(sfd,SOL_SOCKET,SO_SNDTIMEO,(char*)&timeout,sizeof(timeout));
   setsockopt(sfd,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout,sizeof(timeout));
   if(connect(sfd,server_result->ai_addr,server_result->ai_addrlen)!=-1){
    freeaddrinfo(server_result);
    char msg[20]="HEAD / HTTP/1.0\r\n\r\n\0";
    send(sfd,msg,strlen(msg),0);
    char buffer[4096];
    bzero(buffer,sizeof(buffer));
    recv(sfd,buffer,sizeof(buffer),0);
    close(sfd);
    printf("%s\n",buffer);
   }
  }
 }
 return 0;
}
# gcc -o httpclient httpclient.c
# ./httpclient 3512046179