tls_timeoutio.c

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/* This is essentially taken from Eric Vermeulen's TLS patch */
#include "select.h"
#include "error.h"
#include "ndelay.h"
#include "now.h"
#include "logmsg.h"
#include "ucspissl.h"
#include "tls_timeoutio.h"
 
// this function pointer needs to be replaced
 
int tls_timeoutio(int (*fun)(),int t,int rfd,int wfd,SSL *ssl,char *buf,int len)
{
  int n;
  const datetime_sec end = (datetime_sec)t + now();
 
  do {
    fd_set fds;
    struct timeval tv;
 
    const int r = buf ? fun(ssl,buf,len) : fun(ssl);
    if (r > 0) return r;
 
    t = end - now();
    if (t < 0) break;
    tv.tv_sec = (time_t)t; tv.tv_usec = 0;
 
    FD_ZERO(&fds);
    switch (SSL_get_error(ssl,r)) {
      default: return r; /* some other error */
       case SSL_ERROR_WANT_READ:
          FD_SET(rfd,&fds); n = select(rfd + 1,&fds,NULL,NULL,&tv);
          break;
        case SSL_ERROR_WANT_WRITE:
          FD_SET(wfd,&fds); n = select(wfd + 1,NULL,&fds,NULL,&tv);
          break;
    }
 
    /* n is the number of descriptors that changed status */
  } while (n > 0);
 
  if (n != -1) errno = ETIMEDOUT;
  return -1;
}
 
int tls_timeoutaccept(int t,int rfd,int wfd,SSL *ssl)
{
  int r;
 
  /* if connection is established, keep NDELAY */
  if (ndelay_on(rfd) == -1 || ndelay_on(wfd) == -1) return -1;
  r = tls_timeoutio(SSL_accept,t,rfd,wfd,ssl,NULL,0);
 
  if (r <= 0) { ndelay_off(rfd); ndelay_off(wfd); }
  else SSL_set_mode(ssl,SSL_MODE_ENABLE_PARTIAL_WRITE);
 
  return r;
}
 
int tls_timeoutconn(int t,int rfd,int wfd,SSL *ssl)
{
  int r;
 
  /* if connection is established, keep NDELAY */
  if (ndelay_on(rfd) == -1 || ndelay_on(wfd) == -1) return -1;
  r = tls_timeoutio(SSL_connect,t,rfd,wfd,ssl,NULL,0);
 
  if (r <= 0) { ndelay_off(rfd); ndelay_off(wfd); }
  else SSL_set_mode(ssl,SSL_MODE_ENABLE_PARTIAL_WRITE);
 
  return r;
}
 
int tls_timeoutrehandshake(int t,int rfd,int wfd,SSL *ssl)
{
  int r;
 
  SSL_renegotiate(ssl);
  r = tls_timeoutio(SSL_do_handshake,t,rfd,wfd,ssl,NULL,0);
  if (r <= 0) return r;
  if (SSL_get_state(ssl) & SSL_ST_CONNECT) return -2; /* now a macro in ssl.h */
 
  /* this is for the client only */
  SSL_set_connect_state(ssl);
 
  return tls_timeoutio(SSL_do_handshake,t,rfd,wfd,ssl,NULL,0);
}
 
int tls_timeoutread(int t,int rfd,int wfd,SSL *ssl,char *buf,int len)
{
  if (!buf) return 0;
  if (SSL_pending(ssl)) return SSL_read(ssl,buf,len);
  return tls_timeoutio(SSL_read,t,rfd,wfd,ssl,buf,len);
}
 
int tls_timeoutwrite(int t,int rfd,int wfd,SSL *ssl,char *buf,int len)
{
  if (!buf) return 0;
  return tls_timeoutio(SSL_write,t,rfd,wfd,ssl,buf,len);
}