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nsock_read.c

/***************************************************************************
 * nsock_read.c -- This contains the functions for requesting various read *
 * events from the nsock parallel socket event library                     *
 *                                                                         *
 ***********************IMPORTANT NSOCK LICENSE TERMS***********************
 *                                                                         *
 * The nsock parallel socket event library is (C) 1999-2008 Insecure.Com   *
 * LLC This library is free software; you may redistribute and/or          *
 * modify it under the terms of the GNU General Public License as          *
 * published by the Free Software Foundation; Version 2.  This guarantees  *
 * your right to use, modify, and redistribute this software under certain *
 * conditions.  If this license is unacceptable to you, Insecure.Com LLC   *
 * may be willing to sell alternative licenses (contact                    *
 * sales@insecure.com ).                                                   *
 *                                                                         *
 * As a special exception to the GPL terms, Insecure.Com LLC grants        *
 * permission to link the code of this program with any version of the     *
 * OpenSSL library which is distributed under a license identical to that  *
 * listed in the included Copying.OpenSSL file, and distribute linked      *
 * combinations including the two. You must obey the GNU GPL in all        *
 * respects for all of the code used other than OpenSSL.  If you modify    *
 * this file, you may extend this exception to your version of the file,   *
 * but you are not obligated to do so.                                     *
 *                                                                         * 
 * If you received these files with a written license agreement stating    *
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 * agreement takes precedence over this comment.                          *
 *                                                                         *
 * Source is provided to this software because we believe users have a     *
 * right to know exactly what a program is going to do before they run it. *
 * This also allows you to audit the software for security holes (none     *
 * have been found so far).                                                *
 *                                                                         *
 * Source code also allows you to port Nmap to new platforms, fix bugs,    *
 * and add new features.  You are highly encouraged to send your changes   *
 * to fyodor@insecure.org for possible incorporation into the main         *
 * distribution.  By sending these changes to Fyodor or one the            *
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 * offering Fyodor and Insecure.Com LLC the unlimited, non-exclusive right *
 * to reuse, modify, and relicense the code.  Nmap will always be          *
 * available Open Source, but this is important because the inability to   *
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 * This program is distributed in the hope that it will be useful, but     *
 * WITHOUT ANY WARRANTY; without even the implied warranty of              *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       *
 * General Public License for more details (                               *
 * http://www.gnu.org/copyleft/gpl.html ).                                 *
 *                                                                         *
 ***************************************************************************/

/* $Id: nsock_read.c 6635 2007-12-22 06:32:18Z fyodor $ */

#include "nsock_internal.h"

/* Read up to nlines lines (terminated with \n, which of course
   inclues \r\n), or until EOF, or until the timeout, whichever comes
   first.  Note that NSE_STATUS_SUCCESS will be returned in the case
   of EOF or tiemout if at least 1 char has been read.  Also note that
   you may get more than 'nlines' back -- we just stop once "at least"
   'nlines' is read */
nsock_event_id nsock_readlines(nsock_pool nsp, nsock_iod ms_iod, 
                   nsock_ev_handler handler, int timeout_msecs,
                   void *userdata, int nlines) {
  msiod *nsi = (msiod *) ms_iod;
  mspool *ms = (mspool *) nsp;
  msevent *nse;


  nse = msevent_new(ms, NSE_TYPE_READ, nsi, timeout_msecs, handler, userdata);
  assert(nse);

  if (ms->tracelevel > 0) {
    if (nsi->peerlen > 0)
      nsock_trace(ms, "Read request for %d lines from IOD #%li [%s:%hi] EID %li", nlines, nsi->id, 
                inet_ntop_ez(&nsi->peer, nsi->peerlen), nsi_peerport(nsi), nse->id);
    else 
      nsock_trace(ms, "Read request for %d lines from IOD #%li (peer unspecified) EID %li", nlines, 
              nsi->id, nse->id);
  }
  
  nse->readinfo.read_type = NSOCK_READLINES;
  nse->readinfo.num = nlines;
  
  nsp_add_event(ms, nse);
  
  return nse->id;
}

/* Same as above, except it tries to read at least 'nbytes' instead of 
   'nlines'. */
nsock_event_id nsock_readbytes(nsock_pool nsp, nsock_iod ms_iod,
                   nsock_ev_handler handler, int timeout_msecs, 
                   void *userdata, int nbytes) {

  msiod *nsi = (msiod *) ms_iod;
  mspool *ms = (mspool *) nsp;
  msevent *nse;

  nse = msevent_new(ms, NSE_TYPE_READ, nsi, timeout_msecs, handler, userdata);
  assert(nse);

  if (ms->tracelevel > 0) {
    if (nsi->peerlen > 0)
      nsock_trace(ms, "Read request for %d bytes from IOD #%li [%s:%hi] EID %li", nbytes, nsi->id, 
                inet_ntop_ez(&nsi->peer, nsi->peerlen), nsi_peerport(nsi), nse->id);
    else 
      nsock_trace(ms, "Read request for %d bytes from IOD #%li (peer unspecified) EID %li", nbytes, 
              nsi->id, nse->id);
  }

  nse->readinfo.read_type = NSOCK_READBYTES;
  nse->readinfo.num = nbytes;
  
  nsp_add_event(ms, nse);
  
  return nse->id;

}


/* The simplest read function -- returns NSE_STATUS_SUCCESS when it
   reads anything, otherwise it returns timeout, eof, or error as
   appropriate */
nsock_event_id nsock_read(nsock_pool nsp, nsock_iod ms_iod, nsock_ev_handler handler, 
                int timeout_msecs, void *userdata) {

  msiod *nsi = (msiod *) ms_iod;
  mspool *ms = (mspool *) nsp;
  msevent *nse;

  nse = msevent_new(ms, NSE_TYPE_READ, nsi, timeout_msecs, handler, userdata);
  assert(nse);

  if (ms->tracelevel > 0) {
    if (nsi->peerlen > 0)
      nsock_trace(ms, "Read request from IOD #%li [%s:%hi] (timeout: %dms) EID %li", nsi->id, inet_ntop_ez(&nsi->peer, nsi->peerlen), nsi_peerport(nsi), timeout_msecs, nse->id);
    else 
      nsock_trace(ms, "Read request from IOD #%li (peer unspecified) (timeout: %dms) EID %li", nsi->id, timeout_msecs, nse->id);
  }

  nse->readinfo.read_type = NSOCK_READ;
  
  nsp_add_event(ms, nse);
  
  return nse->id;

}


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