/*************************************************************************** * 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) 1999-2017 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). * * * ***************************************************************************/ /* $Id$ */ #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"; }