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nsock_tod is Nsock's idea of the current time. It is updated when an nsock_pool is initialized, on each iteration of nsock_loop, and in a few other places. What could go wrong, with respect to timers, is a sequence like this: nsp_new [... some long delay ...] nsock_create_timer(timeout) nsock_loop The time elapsed after the creatino of the timer until it fires would not be timeout, but rather timeout - delay. If the delay was long enough, the timer would fire as loop as nsock_loop was entered. This showed itself in IPv6 OS detection. We schedule 6 timers immediately, 100 ms apart. If the pcap_open or anything else took too long, then the timers would fire all at once. This messed up the calculation of the TCP_ISR feature. Perhaps we should do this when any new event is created? It is already done manually at the beginning of each of the connect functions.
82 lines
4.8 KiB
C
82 lines
4.8 KiB
C
/***************************************************************************
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* nsock_read.c -- This contains the functions for requesting timers *
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* from the nsock parallel socket event library *
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* *
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***********************IMPORTANT NSOCK LICENSE TERMS***********************
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* *
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* The nsock parallel socket event library is (C) 1999-2012 Insecure.Com *
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* LLC This library is free software; you may redistribute and/or *
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* modify it under the terms of the GNU General Public License as *
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* published by the Free Software Foundation; Version 2. This guarantees *
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* your right to use, modify, and redistribute this software under certain *
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* conditions. If this license is unacceptable to you, Insecure.Com LLC *
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* may be willing to sell alternative licenses (contact *
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* sales@insecure.com ). *
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* *
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* As a special exception to the GPL terms, Insecure.Com LLC grants *
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* permission to link the code of this program with any version of the *
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* OpenSSL library which is distributed under a license identical to that *
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* listed in the included docs/licenses/OpenSSL.txt file, and distribute *
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* linked combinations including the two. You must obey the GNU GPL in all *
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* respects for all of the code used other than OpenSSL. If you modify *
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* this file, you may extend this exception to your version of the file, *
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* but you are not obligated to do so. *
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* *
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* If you received these files with a written license agreement stating *
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* terms other than the (GPL) terms above, then that alternative license *
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* agreement takes precedence over this comment. *
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* *
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* Source is provided to this software because we believe users have a *
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* right to know exactly what a program is going to do before they run it. *
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* This also allows you to audit the software for security holes (none *
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* have been found so far). *
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* *
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* Source code also allows you to port Nmap to new platforms, fix bugs, *
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* and add new features. You are highly encouraged to send your changes *
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* to nmap-dev@insecure.org for possible incorporation into the main *
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* distribution. By sending these changes to Fyodor or one of the *
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* Insecure.Org development mailing lists, it is assumed that you are *
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* offering the Nmap Project (Insecure.Com LLC) the unlimited, *
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* non-exclusive right to reuse, modify, and relicense the code. Nmap *
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* will always be available Open Source, but this is important because the *
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* inability to relicense code has caused devastating problems for other *
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* Free Software projects (such as KDE and NASM). We also occasionally *
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* relicense the code to third parties as discussed above. If you wish to *
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* specify special license conditions of your contributions, just say so *
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* when you send them. *
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* *
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* This program is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* General Public License v2.0 for more details *
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* (http://www.gnu.org/licenses/gpl-2.0.html). *
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* *
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***************************************************************************/
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/* $Id$ */
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#include "nsock_internal.h"
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extern struct timeval nsock_tod;
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/* Send back an NSE_TYPE_TIMER after the number of milliseconds specified. Of
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* course it can also return due to error, cancellation, etc. */
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nsock_event_id nsock_timer_create(nsock_pool ms_pool, nsock_ev_handler handler,
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int timeout_msecs, void *userdata) {
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mspool *nsp = (mspool *)ms_pool;
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msevent *nse;
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gettimeofday(&nsock_tod, NULL);
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nse = msevent_new(nsp, NSE_TYPE_TIMER, NULL, timeout_msecs, handler, userdata);
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assert(nse);
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if (nsp->tracelevel > 0)
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nsock_trace(nsp, "Timer created - %dms from now. EID %li", timeout_msecs, nse->id);
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nsp_add_event(nsp, nse);
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return nse->id;
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}
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