Simple HTTP GET in C

http_get.c

/* BUILD: gcc -lcrypto -lssl http_get.c -o http_get */
/* USAGE: ./http_get www.google.com */

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

#define BUFFER_SIZE 1024

int main(int argc, char *argv[]) {
  struct addrinfo hints, *result, *rp;
  char buffer[BUFFER_SIZE];
  int sfd;
  memset(&hints, 0, sizeof(struct addrinfo));

  if (argc < 2) {
    exit(1);
  }

  hints.ai_family = AF_UNSPEC;
  hints.ai_socktype = SOCK_STREAM;
  hints.ai_flags = 0;
  hints.ai_protocol = 0;

  char host[1024], path[1024];
  char* has_slash = strchr(argv[1], '/');
  int idex = has_slash ? has_slash - argv[1] : -1;
  if (idex != -1) {
    strcat(path, argv[1] + idex + 1);
    memcpy(host, argv[1], idex);
  } else {
    strcat(host, argv[1]);
  }

  if (getaddrinfo(host, "80", &hints, &result) != 0) {
    printf("Error retrieving address information\n");
    exit(1);
  }

  for (rp = result; rp != NULL; rp = rp->ai_next) {
    sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
    if (sfd == -1) {
      continue;
    }
    if (connect(sfd, rp->ai_addr, rp->ai_addrlen) != -1) {
      break;
    }
    close(sfd);
  }

  if (rp == NULL) {
    printf("Error connecting to host\n");
    exit(1);
  }

  freeaddrinfo(result);
  char sendline[1024];
  sprintf(sendline, "GET /%s HTTP/1.0\r\nHost: %s\r\n\r\n", path, host);
  write(sfd, sendline, strlen(sendline));
  memset(buffer, 0, BUFFER_SIZE);
  while(read(sfd, buffer, BUFFER_SIZE - 1) != 0) {
    printf("%s", buffer);
    memset(buffer, 0, BUFFER_SIZE);
  }

  shutdown(sfd, SHUT_RDWR);
  close(sfd);

  return 0;
}