SSL_read reads 0 bytes after SSL_write/SSL_read/SSL_write

[Dima Rusyy]

Hello!

I use openssl to work with apache server via https.
But I see a strange situation when the second and the third calls to send()
in my test-case read 0 bytes from socket.
Can you provide here any help?

I use 'Fedora Core 7 x86' and openssl-0.9.8e.

Thanks!

Here is a test-case:

#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/bio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
              

#include <iostream>
using namespace std;

#define MAX_PACKET_SIZE 10000

BIO * bio, *ssl_bio, *sbio;
SSL * ssl;
SSL_CTX * ctx;

void send(){

  char *write_buf = "GET / HTTP/1.0\n\n";

  if(SSL_write(ssl, write_buf, strlen(write_buf)) <= 0){
    std::cout << "Failed write" << std::endl; 
  }


  char buf[MAX_PACKET_SIZE];

  std::cout << "=====================" << std::endl;
  int p;
  char r[1024];
  for(;;)
  {
    p = SSL_read(ssl, r, 1023);
    printf("read %d bytes\n", p );
    if(p <= 0) break;
    r[p] = 0;
    printf("%s", r);
  }

  std::cout << std::endl << "=====================" << std::endl;

  /* To free it from memory, use this line */

    int ssl_er = SSL_get_error(ssl, 0);
    printf("ssl_er=%d\n", ssl_er);

}

int main() {
  /* Initializing OpenSSL */

  SSL_load_error_strings();
  ERR_load_BIO_strings();
  OpenSSL_add_all_algorithms();

  SSL_library_init(); //mandatory and missing from some examples
  ctx = SSL_CTX_new(SSLv23_client_method());

  if (ctx == NULL) {
    std::cout << "Ctx is null" << std::endl;
    ERR_print_errors_fp(stderr);
  }
  
  /*create ssl*/
  ssl = SSL_new(ctx);

  /*create bio*/
  int sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 
  struct sockaddr_in addr;
  memset (&addr, '\0', sizeof(addr));
  addr.sin_family      = AF_INET;
  addr.sin_port        = htons(443);       /* Server Port number */
  addr.sin_addr.s_addr = inet_addr("192.168.40.27"); /* Server IP */
      
  int  err = connect(sock, (struct sockaddr*) &addr, sizeof(addr));

  sbio = BIO_new_socket(sock, BIO_NOCLOSE);
  SSL_set_bio(ssl, sbio, sbio);

  err = SSL_connect(ssl);
  
  send();
  send();
  send();

  BIO_free_all(sbio);
  ERR_print_errors_fp(stderr);
  
  return 0;
}

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