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809f1eda68307b311ace04391eedbc74651829a5
nmap/nsock/src/engine_kqueue.c
henri 809f1eda68 Merged nsock-logging from nmap-exp/henri/nsock-logging/ 
Reworked the logging infrastructure to make it more flexible
and consistent.

Updated nmap, nping and ncat accordingly.  Nsock log level can
now be adjusted at runtime by pressing d/D in nmap.
2012-12-15 10:59:30 +00:00

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/***************************************************************************
* engine_kqueue.c -- BSD kqueue(2) based IO engine. *
* *
***********************IMPORTANT NSOCK LICENSE TERMS***********************
* *
* The nsock parallel socket event library is (C) 1999-2012 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 docs/licenses/OpenSSL.txt 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 *
* terms other than the (GPL) terms above, then that alternative license *
* 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 the dev@nmap.org mailing list for possible incorporation into the *
* main distribution. By sending these changes to Fyodor or one of the *
* Insecure.Org development mailing lists, or checking them into the Nmap *
* source code repository, it is understood (unless you specify otherwise) *
* that you are offering the Nmap Project (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 relicense code has caused devastating problems *
* for other Free Software projects (such as KDE and NASM). We also *
* occasionally relicense the code to third parties as discussed above. *
* If you wish to specify special license conditions of your *
* contributions, just say so when you send them. *
* *
* 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 v2.0 for more details *
* (http://www.gnu.org/licenses/gpl-2.0.html). *
* *
***************************************************************************/
/* $Id$ */
#ifdef HAVE_CONFIG_H
#include "nsock_config.h"
#endif
#if HAVE_KQUEUE
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#include <errno.h>
#include "nsock_internal.h"
#include "nsock_log.h"
#if HAVE_PCAP
#include "nsock_pcap.h"
#endif
#define INITIAL_EV_COUNT 128
/* --- ENGINE INTERFACE PROTOTYPES --- */
static int kqueue_init(mspool *nsp);
static void kqueue_destroy(mspool *nsp);
static int kqueue_iod_register(mspool *nsp, msiod *iod, int ev);
static int kqueue_iod_unregister(mspool *nsp, msiod *iod);
static int kqueue_iod_modify(mspool *nsp, msiod *iod, int ev_set, int ev_clr);
static int kqueue_loop(mspool *nsp, int msec_timeout);
/* ---- ENGINE DEFINITION ---- */
struct io_engine engine_kqueue = {
"kqueue",
kqueue_init,
kqueue_destroy,
kqueue_iod_register,
kqueue_iod_unregister,
kqueue_iod_modify,
kqueue_loop
};
/* --- INTERNAL PROTOTYPES --- */
static void iterate_through_event_lists(mspool *nsp, int evcount);
/* defined in nsock_core.c */
void process_iod_events(mspool *nsp, msiod *nsi, int ev);
void process_event(mspool *nsp, gh_list *evlist, msevent *nse, int ev);
#if HAVE_PCAP
#ifndef PCAP_CAN_DO_SELECT
int pcap_read_on_nonselect(mspool *nsp);
#endif
#endif
/* defined in nsock_event.c */
void update_first_events(msevent *nse);
extern struct timeval nsock_tod;
/*
* Engine specific data structure
*/
struct kqueue_engine_info {
int kqfd;
int maxfd;
size_t evlen;
struct kevent *events;
};
int kqueue_init(mspool *nsp) {
struct kqueue_engine_info *kinfo;
kinfo = (struct kqueue_engine_info *)safe_malloc(sizeof(struct kqueue_engine_info));
kinfo->kqfd = kqueue();
kinfo->maxfd = -1;
kinfo->evlen = INITIAL_EV_COUNT;
kinfo->events = (struct kevent *)safe_malloc(INITIAL_EV_COUNT * sizeof(struct kevent));
nsp->engine_data = (void *)kinfo;
return 1;
}
void kqueue_destroy(mspool *nsp) {
struct kqueue_engine_info *kinfo = (struct kqueue_engine_info *)nsp->engine_data;
assert(kinfo != NULL);
close(kinfo->kqfd);
free(kinfo->events);
free(kinfo);
}
int kqueue_iod_register(mspool *nsp, msiod *iod, int ev) {
struct kqueue_engine_info *kinfo = (struct kqueue_engine_info *)nsp->engine_data;
assert(!IOD_PROPGET(iod, IOD_REGISTERED));
IOD_PROPSET(iod, IOD_REGISTERED);
iod->watched_events = EV_NONE;
kqueue_iod_modify(nsp, iod, ev, EV_NONE);
if (nsi_getsd(iod) > kinfo->maxfd)
kinfo->maxfd = nsi_getsd(iod);
return 1;
}
int kqueue_iod_unregister(mspool *nsp, msiod *iod) {
struct kqueue_engine_info *kinfo = (struct kqueue_engine_info *)nsp->engine_data;
/* some IODs can be unregistered here if they're associated to an event that was
* immediately completed */
if (IOD_PROPGET(iod, IOD_REGISTERED)) {
kqueue_iod_modify(nsp, iod, EV_NONE, EV_READ|EV_WRITE);
IOD_PROPCLR(iod, IOD_REGISTERED);
if (nsi_getsd(iod) == kinfo->maxfd)
kinfo->maxfd--;
}
iod->watched_events = EV_NONE;
return 1;
}
#define EV_SETFLAG(_set, _ev) (((_set) & (_ev)) ? (EV_ADD|EV_ENABLE) : (EV_ADD|EV_DISABLE))
int kqueue_iod_modify(mspool *nsp, msiod *iod, int ev_set, int ev_clr) {
struct kevent kev[2];
int new_events, i;
struct kqueue_engine_info *kinfo = (struct kqueue_engine_info *)nsp->engine_data;
assert((ev_set & ev_clr) == 0);
assert(IOD_PROPGET(iod, IOD_REGISTERED));
new_events = iod->watched_events;
new_events |= ev_set;
new_events &= ~ev_clr;
if (new_events == iod->watched_events)
return 1; /* nothing to do */
i = 0;
if ((ev_set ^ ev_clr) & EV_READ) {
EV_SET(&kev[i], nsi_getsd(iod), EVFILT_READ, EV_SETFLAG(ev_set, EV_READ), 0, 0, (void *)iod);
i++;
}
if ((ev_set ^ ev_clr) & EV_WRITE) {
EV_SET(&kev[i], nsi_getsd(iod), EVFILT_WRITE, EV_SETFLAG(ev_set, EV_WRITE), 0, 0, (void *)iod);
i++;
}
if (i > 0 && kevent(kinfo->kqfd, kev, i, NULL, 0, NULL) < 0)
fatal("Unable to update events for IOD #%lu: %s", iod->id, strerror(errno));
iod->watched_events = new_events;
return 1;
}
int kqueue_loop(mspool *nsp, int msec_timeout) {
int results_left = 0;
int event_msecs; /* msecs before an event goes off */
int combined_msecs;
struct timespec ts, *ts_p;
int sock_err = 0;
struct kqueue_engine_info *kinfo = (struct kqueue_engine_info *)nsp->engine_data;
assert(msec_timeout >= -1);
if (nsp->events_pending == 0)
return 0; /* No need to wait on 0 events ... */
if (GH_LIST_COUNT(&nsp->active_iods) > kinfo->evlen) {
kinfo->evlen = GH_LIST_COUNT(&nsp->active_iods) * 2;
kinfo->events = (struct kevent *)safe_realloc(kinfo->events, kinfo->evlen * sizeof(struct kevent));
}
do {
nsock_log_debug_all(nsp, "wait_for_events");
if (nsp->next_ev.tv_sec == 0)
event_msecs = -1; /* None of the events specified a timeout */
else
event_msecs = MAX(0, TIMEVAL_MSEC_SUBTRACT(nsp->next_ev, nsock_tod));
#if HAVE_PCAP
#ifndef PCAP_CAN_DO_SELECT
/* Force a low timeout when capturing packets on systems where
* the pcap descriptor is not select()able. */
if (GH_LIST_COUNT(&nsp->pcap_read_events) > 0)
if (event_msecs > PCAP_POLL_INTERVAL)
event_msecs = PCAP_POLL_INTERVAL;
#endif
#endif
/* We cast to unsigned because we want -1 to be very high (since it means no
* timeout) */
combined_msecs = MIN((unsigned)event_msecs, (unsigned)msec_timeout);
/* Set up the timeval pointer we will give to kevent() */
memset(&ts, 0, sizeof(struct timespec));
if (combined_msecs >= 0) {
ts.tv_sec = combined_msecs / 1000;
ts.tv_nsec = (combined_msecs % 1000) * 1000000L;
ts_p = &ts;
} else {
ts_p = NULL;
}
#if HAVE_PCAP
#ifndef PCAP_CAN_DO_SELECT
/* do non-blocking read on pcap devices that doesn't support select()
* If there is anything read, just leave this loop. */
if (pcap_read_on_nonselect(nsp)) {
/* okay, something was read. */
} else
#endif
#endif
{
results_left = kevent(kinfo->kqfd, NULL, 0, kinfo->events, kinfo->evlen, ts_p);
if (results_left == -1)
sock_err = socket_errno();
}
gettimeofday(&nsock_tod, NULL); /* Due to kevent delay */
} while (results_left == -1 && sock_err == EINTR); /* repeat only if signal occurred */
if (results_left == -1 && sock_err != EINTR) {
nsock_log_error(nsp, "nsock_loop error %d: %s", sock_err, socket_strerror(sock_err));
nsp->errnum = sock_err;
return -1;
}
iterate_through_event_lists(nsp, results_left);
return 1;
}
/* ---- INTERNAL FUNCTIONS ---- */
static inline int get_evmask(msiod *nsi, const struct kevent *kev) {
int evmask = EV_NONE;
/* generate the corresponding event mask with nsock event flags */
if (kev->flags & EV_ERROR) {
evmask |= EV_EXCEPT;
if (kev->data == EPIPE && (nsi->watched_events & EV_READ))
evmask |= EV_READ;
} else {
switch (kev->filter) {
case EVFILT_READ:
evmask |= EV_READ;
break;
case EVFILT_WRITE:
evmask |= EV_WRITE;
break;
default:
fatal("Unsupported filter value: %d\n", (int)kev->filter);
}
}
return evmask;
}
/* Iterate through all the event lists (such as connect_events, read_events,
* timer_events, etc) and take action for those that have completed (due to
* timeout, i/o, etc) */
void iterate_through_event_lists(mspool *nsp, int evcount) {
int n;
struct kqueue_engine_info *kinfo = (struct kqueue_engine_info *)nsp->engine_data;
gh_list_elem *current, *next, *last, *timer_last;
msevent *nse;
msiod *nsi;
/* Clear it -- We will find the next event as we go through the list */
nsp->next_ev.tv_sec = 0;
last = GH_LIST_LAST_ELEM(&nsp->active_iods);
timer_last = GH_LIST_LAST_ELEM(&nsp->timer_events);
for (n = 0; n < evcount; n++) {
struct kevent *kev = &kinfo->events[n];
nsi = (msiod *)kev->udata;
/* process all the pending events for this IOD */
process_iod_events(nsp, nsi, get_evmask(nsi, kev));
IOD_PROPSET(nsi, IOD_PROCESSED);
}
current = GH_LIST_FIRST_ELEM(&nsp->active_iods);
/* cull timeouts amongst the non active IODs */
while (current != NULL && GH_LIST_ELEM_PREV(current) != last) {
msiod *nsi = (msiod *)GH_LIST_ELEM_DATA(current);
if (IOD_PROPGET(nsi, IOD_PROCESSED))
IOD_PROPCLR(nsi, IOD_PROCESSED);
else if (nsi->state != NSIOD_STATE_DELETED && nsi->events_pending)
process_iod_events(nsp, nsi, EV_NONE);
next = GH_LIST_ELEM_NEXT(current);
if (nsi->state == NSIOD_STATE_DELETED) {
gh_list_remove_elem(&nsp->active_iods, current);
gh_list_prepend(&nsp->free_iods, nsi);
}
current = next;
}
/* iterate through timers */
for (current = GH_LIST_FIRST_ELEM(&nsp->timer_events);
current != NULL && GH_LIST_ELEM_PREV(current) != timer_last; current = next) {
nse = (msevent *)GH_LIST_ELEM_DATA(current);
process_event(nsp, &nsp->timer_events, nse, EV_NONE);
next = GH_LIST_ELEM_NEXT(current);
if (nse->event_done)
gh_list_remove_elem(&nsp->timer_events, current);
}
}
#endif /* HAVE_KQUEUE */
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