/*************************************************************************** * sys_wrap.c -- Error-checked wrappers around common functions. * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2011 Insecure.Com LLC. Nmap is * * also a registered trademark of Insecure.Com LLC. This program 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 with the clarifications and exceptions described * * below. This guarantees your right to use, modify, and redistribute * * this software under certain conditions. If you wish to embed Nmap * * technology into proprietary software, we sell alternative licenses * * (contact sales@insecure.com). Dozens of software vendors already * * license Nmap technology such as host discovery, port scanning, OS * * detection, and version detection. * * * * Note that the GPL places important restrictions on "derived works", yet * * it does not provide a detailed definition of that term. To avoid * * misunderstandings, we consider an application to constitute a * * "derivative work" for the purpose of this license if it does any of the * * following: * * o Integrates source code from Nmap * * o Reads or includes Nmap copyrighted data files, such as * * nmap-os-db or nmap-service-probes. * * o Executes Nmap and parses the results (as opposed to typical shell or * * execution-menu apps, which simply display raw Nmap output and so are * * not derivative works.) * * o Integrates/includes/aggregates Nmap into a proprietary executable * * installer, such as those produced by InstallShield. * * o Links to a library or executes a program that does any of the above * * * * The term "Nmap" should be taken to also include any portions or derived * * works of Nmap. This list is not exclusive, but is meant to clarify our * * interpretation of derived works with some common examples. Our * * interpretation applies only to Nmap--we don't speak for other people's * * GPL works. * * * * If you have any questions about the GPL licensing restrictions on using * * Nmap in non-GPL works, we would be happy to help. As mentioned above, * * we also offer alternative license to integrate Nmap into proprietary * * applications and appliances. These contracts have been sold to dozens * * of software vendors, and generally include a perpetual license as well * * as providing for priority support and updates as well as helping to * * fund the continued development of Nmap technology. Please email * * sales@insecure.com for further information. * * * * 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 or * * contract stating terms other than the terms above, then that * * alternative license agreement takes precedence over these comments. * * * * 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 nmap-dev@insecure.org for possible incorporation into the main * * distribution. By sending these changes to Fyodor or one of the * * Insecure.Org development mailing lists, it is assumed 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 at * * http://www.gnu.org/licenses/gpl-2.0.html , or in the COPYING file * * included with Nmap. * * * ***************************************************************************/ /* $Id$ */ #include #include "sys_wrap.h" #include "util.h" void * Calloc(size_t nmemb, size_t size) { void *ret; /* older libcs don't check for int overflow */ smul(nmemb, size); ret = calloc(nmemb, size); if(ret == NULL) die("calloc"); return ret; } int Close(int fd) { if(close(fd) < 0) die("close"); return 0; } int Connect(int sockfd, const struct sockaddr *serv_addr, socklen_t addrlen) { if(connect(sockfd, serv_addr, addrlen) < 0) die("connect"); return 0; } int Dup2(int oldfd, int newfd) { int ret; ret = dup2(oldfd, newfd); if(ret < 0) die("dup2"); return ret; } int Listen(int s, int backlog) { if(listen(s, backlog) < 0) die("listen"); return 0; } int Open(const char *pathname, int flags, mode_t mode) { int ret; ret = open(pathname, flags, mode); if(ret < 0) die("open"); return ret; } ssize_t Read(int fd, void *buf, size_t count) { ssize_t ret; ret = read(fd, buf, count); if(ret < 0) die("read"); return ret; } ssize_t Recv(int s, void *buf, size_t len, int flags) { ssize_t ret; ret = recv(s, (char*)buf, len, flags); if(ret < 0) die("recv"); return ret; } ssize_t Recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen) { ssize_t ret; ret = recvfrom(s, (char*)buf, len, flags, from, fromlen); if(ret < 0) die("recvfrom"); return ret; } int Setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen) { int ret; ret = setsockopt(s, level, optname, (const char*)optval, optlen); if(ret < 0) die("setsockopt"); return ret; } sighandler_t Signal(int signum, sighandler_t handler) { sighandler_t ret; ret = signal(signum, handler); if(ret == SIG_ERR) die("signal"); return ret; } int Socket(int domain, int type, int protocol) { int ret; ret = socket(domain, type, protocol); if(ret < 0) die("socket"); return ret; } char * Strdup(const char *s) { char *ret; ret = strdup(s); if(ret == NULL) die("strdup"); return ret; } ssize_t Write(int fd, const void *buf, size_t count) { ssize_t ret = write(fd, buf, count); if(ret < 0) /* we don't bail if < count bytes written */ die("write"); return ret; }