Simplest https client with C

shttpsc.c

// compile : $ gcc file.c -lssl -lcrypto
#include <openssl/bio.h>
#include <openssl/ssl.h>
#include <openssl/x509v3.h>
#include <string.h>
#include <stdio.h>

#define DEB printf("%d\n",__LINE__ );

SSL *get_ssl(BIO *bio) {
  SSL *ssl = NULL;
  BIO_get_ssl(bio, &ssl);
  if (ssl == NULL)  printf("Error in BIO_get_ssl\n");
  return ssl;
}

int main() {
  BIO *sbio, *out, *bio, *ssl_bio;
  int len;
  char tmpbuf[1024], buffer[4024];
  SSL_CTX *ctx;
  SSL *ssl;

  ctx = SSL_CTX_new(TLS_client_method());
  if (SSL_CTX_set_default_verify_paths(ctx) != 1) { DEB }
  bio = BIO_new_connect("gitlab.com:443");
  if (BIO_do_connect(bio) <= 0) { DEB }
  ssl_bio =   BIO_push( BIO_new_ssl(ctx , 1), bio );
  SSL_set_tlsext_host_name( get_ssl(ssl_bio), "gitlab.com" );
  SSL_set1_host( get_ssl(ssl_bio), "gitlab.com" );
  printf( "line %d\n", __LINE__ );
  if (BIO_do_handshake(ssl_bio) <= 0) { DEB }
  //my::verify_the_certificate(my::get_ssl(ssl_bio.get()), "gitlab.com" );
  char data[200] = "GET /api/v4/users/umarudy/events HTTP/1.1\r\nHost: gitlab.com\r\nPRIVATE-TOKEN: <CHANGE TOKEN HERE>\r\n\r\n";
  len = strlen( data );
  BIO_write(ssl_bio, data, len );
  BIO_flush(ssl_bio);
  do {
    len = BIO_read(ssl_bio, buffer, sizeof(buffer));
    buffer[len] = 0;
  //   if( buffer[len-1] == '\n' && buffer[len-2] == '\r') break;

    printf( "%s", buffer);
  } while ( len > 0 );
    return 0;
}