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0348359f607428897d5ec4de60622602a01c0173
nmap/nsock/src/nsock_pool.c
henri 0348359f60 Enforce nsock naming scheme. 
convert nsp_* calls into nsock_pool_*. Separate words with underscores
where appropriate.
2015-06-27 08:21:16 +00:00

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/***************************************************************************
* nsock_pool.c -- This contains the functions that deal with creating, *
* destroying, and otherwise manipulating nsock_pools (and their internal *
* struct npool representation). An nsock_pool aggregates and manages events *
* and i/o descriptors *
* *
***********************IMPORTANT NSOCK LICENSE TERMS***********************
* *
* The nsock parallel socket event library is (C) 1999-2015 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. *
* *
* 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). *
* *
***************************************************************************/
/* $Id$ */
#include "nsock_internal.h"
#include "nsock_log.h"
#include "gh_list.h"
#include "netutils.h"
#include <string.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <signal.h>
extern struct timeval nsock_tod;
/* To use this library, the first thing they must do is create a pool
* so we do the initialization during the first pool creation */
static int nsocklib_initialized = 0;
/* defined in nsock_engines.h */
struct io_engine *get_io_engine(void);
/* ---- INTERNAL FUNCTIONS PROTOTYPES ---- */
static void nsock_library_initialize(void);
/* --------------------------------------- */
/* This next function returns the errno style error code -- which is only
* valid if the status NSOCK_LOOP_ERROR was returned by nsock_loop() */
int nsock_pool_get_errorcode(nsock_pool nsp) {
struct npool *mt = (struct npool *)nsp;
return mt->errnum;
}
/* Sometimes it is useful to store a pointer to information inside
* the NSP so you can retrieve it during a callback. */
void nsock_pool_set_udata(nsock_pool nsp, void *data) {
struct npool *mt = (struct npool *)nsp;
mt->userdata = data;
}
/* And the define above wouldn't make much sense if we didn't have a way
* to retrieve that data ... */
void *nsock_pool_get_udata(nsock_pool nsp) {
struct npool *mt = (struct npool *)nsp;
return mt->userdata;
}
/* Turns on or off broadcast support on new sockets. Default is off (0, false)
* set in nsock_pool_new(). Any non-zero (true) value sets SO_BROADCAST on all new
* sockets (value of optval will be used directly in the setsockopt() call */
void nsock_pool_set_broadcast(nsock_pool nsp, int optval) {
struct npool *mt = (struct npool *)nsp;
mt->broadcast = optval;
}
/* Sets the name of the interface for new sockets to bind to. */
void nsock_pool_set_device(nsock_pool nsp, const char *device) {
struct npool *mt = (struct npool *)nsp;
mt->device = device;
}
static int expirable_cmp(gh_hnode_t *n1, gh_hnode_t *n2) {
struct nevent *nse1;
struct nevent *nse2;
nse1 = container_of(n1, struct nevent, expire);
nse2 = container_of(n2, struct nevent, expire);
return (TIMEVAL_BEFORE(nse1->timeout, nse2->timeout)) ? 1 : 0;
}
/* And here is how you create an nsock_pool. This allocates, initializes, and
* returns an nsock_pool event aggregator. In the case of error, NULL will be
* returned. If you do not wish to immediately associate any userdata, pass in
* NULL. */
nsock_pool nsock_pool_new(void *userdata) {
struct npool *nsp;
/* initialize the library in not already done */
if (!nsocklib_initialized) {
nsock_library_initialize();
nsocklib_initialized = 1;
}
nsp = (struct npool *)safe_malloc(sizeof(*nsp));
memset(nsp, 0, sizeof(*nsp));
gettimeofday(&nsock_tod, NULL);
nsp->loglevel = NSOCK_LOG_ERROR;
nsp->logger = (nsock_logger_t)nsock_stderr_logger;
nsp->userdata = userdata;
nsp->engine = get_io_engine();
nsock_engine_init(nsp);
/* initialize IO events lists */
gh_list_init(&nsp->connect_events);
gh_list_init(&nsp->read_events);
gh_list_init(&nsp->write_events);
#if HAVE_PCAP
gh_list_init(&nsp->pcap_read_events);
#endif
/* initialize timer heap */
gh_heap_init(&nsp->expirables, expirable_cmp);
/* initialize the list of IODs */
gh_list_init(&nsp->active_iods);
/* initialize caches */
gh_list_init(&nsp->free_iods);
gh_list_init(&nsp->free_events);
nsp->next_event_serial = 1;
nsp->device = NULL;
#if HAVE_OPENSSL
nsp->sslctx = NULL;
#endif
nsp->px_chain = NULL;
return (nsock_pool)nsp;
}
/* If nsock_pool_new returned success, you must free the nsp when you are done with it
* to conserve memory (and in some cases, sockets). After this call, nsp may no
* longer be used. Any pending events are sent an NSE_STATUS_KILL callback and
* all outstanding iods are deleted. */
void nsock_pool_delete(nsock_pool ms_pool) {
struct npool *nsp = (struct npool *)ms_pool;
struct nevent *nse;
struct niod *nsi;
int i;
gh_lnode_t *current, *next;
gh_list_t *event_lists[] = {
&nsp->connect_events,
&nsp->read_events,
&nsp->write_events,
#if HAVE_PCAP
&nsp->pcap_read_events,
#endif
NULL
};
assert(nsp);
/* First I go through all the events sending NSE_STATUS_KILL */
for (i = 0; event_lists[i] != NULL; i++) {
while (gh_list_count(event_lists[i]) > 0) {
gh_lnode_t *lnode = gh_list_pop(event_lists[i]);
assert(lnode);
#if HAVE_PCAP
if (event_lists[i] == &nsp->pcap_read_events)
nse = lnode_nevent2(lnode);
else
#endif
nse = lnode_nevent(lnode);
assert(nse);
nse->status = NSE_STATUS_KILL;
nsock_trace_handler_callback(nsp, nse);
nse->handler(nsp, nse, nse->userdata);
if (nse->iod) {
nse->iod->events_pending--;
assert(nse->iod->events_pending >= 0);
}
event_delete(nsp, nse);
}
gh_list_free(event_lists[i]);
}
/* Kill timers too, they're not in event lists */
while (gh_heap_count(&nsp->expirables) > 0) {
gh_hnode_t *hnode;
hnode = gh_heap_pop(&nsp->expirables);
nse = container_of(hnode, struct nevent, expire);
if (nse->type == NSE_TYPE_TIMER) {
nse->status = NSE_STATUS_KILL;
nsock_trace_handler_callback(nsp, nse);
nse->handler(nsp, nse, nse->userdata);
event_delete(nsp, nse);
gh_list_append(&nsp->free_events, &nse->nodeq_io);
}
}
gh_heap_free(&nsp->expirables);
/* foreach struct niod */
for (current = gh_list_first_elem(&nsp->active_iods);
current != NULL;
current = next) {
next = gh_lnode_next(current);
nsi = container_of(current, struct niod, nodeq);
nsi_delete(nsi, NSOCK_PENDING_ERROR);
gh_list_remove(&nsp->active_iods, current);
gh_list_prepend(&nsp->free_iods, &nsi->nodeq);
}
/* Now we free all the memory in the free iod list */
while ((current = gh_list_pop(&nsp->free_iods))) {
nsi = container_of(current, struct niod, nodeq);
free(nsi);
}
while ((current = gh_list_pop(&nsp->free_events))) {
nse = lnode_nevent(current);
free(nse);
}
gh_list_free(&nsp->active_iods);
gh_list_free(&nsp->free_iods);
gh_list_free(&nsp->free_events);
nsock_engine_destroy(nsp);
#if HAVE_OPENSSL
if (nsp->sslctx != NULL)
SSL_CTX_free(nsp->sslctx);
#endif
free(nsp);
}
void nsock_library_initialize(void) {
int res;
/* We want to make darn sure the evil SIGPIPE is ignored */
#ifndef WIN32
signal(SIGPIPE, SIG_IGN);
#endif
/* And we're gonna need sockets -- LOTS of sockets ... */
res = maximize_fdlimit();
#ifndef WIN32
assert(res > 7);
#endif
}
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