/*************************************************************************** * netutils.c -- This contains some useful little network/socket related * * utility functions. * * * ***********************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). * * * ***************************************************************************/ /* $Id$ */ #include "netutils.h" #include "error.h" #if WIN32 #include "Winsock2.h" #endif #if HAVE_SYS_TIME_H #include #endif #if HAVE_SYS_RESOURCE_H #include #endif #if HAVE_UNISTD_H #include #endif #if HAVE_NETINET_IN_H #include #endif #if HAVE_SYS_TYPES_H #include #endif #if HAVE_SYS_SOCKET_H #include #endif #if HAVE_FCNTL_H #include #endif #if HAVE_SYS_UN_H #include #endif static int netutils_debugging = 0; /* maximize the number of file descriptors (including sockets) allowed for this * process and return that maximum value (note -- you better not actually open * this many -- stdin, stdout, other files opened by libraries you use, etc. all * count toward this limit. Leave a little slack */ int maximize_fdlimit(void) { #ifndef WIN32 struct rlimit r; static int maxfds = -1; if (maxfds > 0) return maxfds; #if(defined(RLIMIT_NOFILE)) if (!getrlimit(RLIMIT_NOFILE, &r)) { r.rlim_cur = r.rlim_max; if (setrlimit(RLIMIT_NOFILE, &r)) if (netutils_debugging) perror("setrlimit RLIMIT_NOFILE failed"); if (!getrlimit(RLIMIT_NOFILE, &r)) { maxfds = r.rlim_cur; return maxfds; } else { return 0; } } #endif #if(defined(RLIMIT_OFILE) && !defined(RLIMIT_NOFILE)) if (!getrlimit(RLIMIT_OFILE, &r)) { r.rlim_cur = r.rlim_max; if (setrlimit(RLIMIT_OFILE, &r)) if (netutils_debugging) perror("setrlimit RLIMIT_OFILE failed"); if (!getrlimit(RLIMIT_OFILE, &r)) { maxfds = r.rlim_cur; return maxfds; } else { return 0; } } #endif #endif /* !WIN32 */ return 0; } #if HAVE_SYS_UN_H #define PEER_STR_LEN sizeof(((struct sockaddr_un *) 0)->sun_path) #else #define PEER_STR_LEN sizeof("[ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255]:xxxxx") #endif #if HAVE_SYS_UN_H /* Get the UNIX domain socket path or empty string if the address family != AF_UNIX. */ const char *get_unixsock_path(const struct sockaddr_storage *addr) { struct sockaddr_un *su = (struct sockaddr_un *)addr; if (!addr || addr->ss_family != AF_UNIX) return ""; return (const char *)su->sun_path; } #endif static int get_port(const struct sockaddr_storage *ss) { if (ss->ss_family == AF_INET) return ntohs(((struct sockaddr_in *) ss)->sin_port); #if HAVE_IPV6 else if (ss->ss_family == AF_INET6) return ntohs(((struct sockaddr_in6 *) ss)->sin6_port); #endif return -1; } static char *get_addr_string(const struct sockaddr_storage *ss, size_t sslen) { static char buffer[PEER_STR_LEN]; #if HAVE_SYS_UN_H if (ss->ss_family == AF_UNIX) { sprintf(buffer, "%s", get_unixsock_path(ss)); return buffer; } #endif sprintf(buffer, "%s:%d", inet_ntop_ez(ss, sslen), get_port(ss)); return buffer; } /* Get the peer/host address string. * In case we have support for UNIX domain sockets, function returns * string containing path to UNIX socket if the address family is AF_UNIX, * otherwise it returns string containing "
:". */ char *get_peeraddr_string(const struct niod *iod) { if (iod->peerlen > 0) return get_addr_string(&iod->peer, iod->peerlen); else return "peer unspecified"; } /* Get the local bind address string. */ char *get_localaddr_string(const struct niod *iod) { return get_addr_string(&iod->local, iod->locallen); }