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/***************************************************************************
* nsock_engines.c -- This contains the functions and definitions to *
* manage the list of available IO engines. Each IO engine leverages a *
* specific IO notification function to wait for events. Nsock will try *
* to use the most efficient engine for your system. *
* *
***********************IMPORTANT NSOCK LICENSE TERMS***********************
*
* The nsock parallel socket event library is (C) 1999-2023 Nmap Software 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, Nmap Software LLC may be willing to sell alternative
* licenses (contact sales@nmap.com ).
*
* As a special exception to the GPL terms, Nmap Software 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 (Nmap Software 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
#include "nsock_internal.h"
#if HAVE_IOCP
extern struct io_engine engine_iocp;
#define ENGINE_IOCP &engine_iocp,
#else
#define ENGINE_IOCP
#endif /* HAVE_IOCP */
#if HAVE_EPOLL
extern struct io_engine engine_epoll;
#define ENGINE_EPOLL &engine_epoll,
#else
#define ENGINE_EPOLL
#endif /* HAVE_EPOLL */
#if HAVE_KQUEUE
extern struct io_engine engine_kqueue;
#define ENGINE_KQUEUE &engine_kqueue,
#else
#define ENGINE_KQUEUE
#endif /* HAVE_KQUEUE */
#if HAVE_POLL
extern struct io_engine engine_poll;
#define ENGINE_POLL &engine_poll,
#else
#define ENGINE_POLL
#endif /* HAVE_POLL */
/* select() based engine is the fallback engine, we assume it's always available */
extern struct io_engine engine_select;
#define ENGINE_SELECT &engine_select,
/* Available IO engines. This depends on which IO management interfaces are
* available on your system. Engines must be sorted by order of preference */
static struct io_engine *available_engines[] = {
ENGINE_EPOLL
ENGINE_KQUEUE
ENGINE_POLL
ENGINE_IOCP
ENGINE_SELECT
NULL
};
static char *engine_hint;
int posix_iod_connect(struct npool *nsp, int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
return connect(sockfd, addr, addrlen);
}
int posix_iod_read(struct npool *nsp, int sockfd, void *buf, size_t len, int flags, struct sockaddr *src_addr, socklen_t *addrlen) {
return recvfrom(sockfd, (char *)buf, len, flags, src_addr, addrlen);
}
int posix_iod_write(struct npool *nsp, int sockfd, const void *buf, size_t len, int flags, const struct sockaddr *dest_addr, socklen_t addrlen) {
struct sockaddr_storage *dest = (struct sockaddr_storage *)dest_addr;
if (dest->ss_family == AF_UNSPEC)
return send(sockfd, (char *)buf, len, flags);
else
return sendto(sockfd, (char *)buf, len, flags, dest_addr, addrlen);
}
struct io_operations posix_io_operations = {
posix_iod_connect,
posix_iod_read,
posix_iod_write
};
struct io_engine *get_io_engine(void) {
struct io_engine *engine = NULL;
int i;
if (!engine_hint) {
engine = available_engines[0];
} else {
for (i = 0; available_engines[i] != NULL; i++)
if (strcmp(engine_hint, available_engines[i]->name) == 0) {
engine = available_engines[i];
break;
}
}
if (!engine)
fatal("No suitable IO engine found! (%s)\n",
engine_hint ? engine_hint : "no hint");
return engine;
}
int nsock_set_default_engine(char *engine) {
if (engine_hint)
free(engine_hint);
if (engine) {
int i;
for (i = 0; available_engines[i] != NULL; i++) {
if (strcmp(engine, available_engines[i]->name) == 0) {
engine_hint = strdup(engine);
return 0;
}
}
return -1;
}
/* having engine = NULL is fine. This is actually the
* way to tell nsock to use the default engine again. */
engine_hint = NULL;
return 0;
}
const char *nsock_list_engines(void) {
return
#if HAVE_IOCP
"iocp "
#endif
#if HAVE_EPOLL
"epoll "
#endif
#if HAVE_KQUEUE
"kqueue "
#endif
#if HAVE_POLL
"poll "
#endif
"select";
}
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