#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>

#define PORT 11011

int main (int argc, char** argv) {
   char* cmdname = *argv++; --argc;
   if (argc != 1) {
      fprintf(stderr, "Usage: %s host\n", cmdname);
      exit(1);
   }
   char* hostname = *argv;
   struct hostent* hp;
   if ((hp = gethostbyname(hostname)) == 0) {
      fprintf(stderr, "unknown host: %s\n", hostname);
      exit(1);
   }
   char* hostaddr = hp->h_addr_list[0];
   struct sockaddr_in addr = {0};
   addr.sin_family = AF_INET;
   memmove((void *) &addr.sin_addr, (void *) hostaddr, hp->h_length);
   addr.sin_port = htons(PORT);

   int fd;
   if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
      perror("socket"); exit(1);
   }
   if (connect(fd, (struct sockaddr *) &addr, sizeof addr) < 0) {
      perror("connect"); exit(1);
   }

   char buffer[BUFSIZ]; ssize_t nbytes;
   while((nbytes = read(fd, buffer, sizeof buffer)) > 0 &&
         write(1, buffer, nbytes) == nbytes);
}