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v7.991
nsock/src/netutils.c
183 строки
6 KB
dmiller
Replace instances of sprintf with Snprintf
18 июл 2026, 00:56
18 июл 2026, 00:56
dd3a975
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/*************************************************************************** * netutils.c -- This contains some useful little network/socket related * * utility functions. * * * ***********************IMPORTANT NSOCK LICENSE TERMS*********************** * * The nsock parallel socket event library is (C) 1999-2026 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). * ***************************************************************************/ /* $Id$ */ #include "netutils.h" #include "error.h" #if WIN32 #include "Winsock2.h" #endif #if HAVE_SYS_TIME_H #include <sys/time.h> #endif #if HAVE_SYS_RESOURCE_H #include <sys/resource.h> #endif #if HAVE_UNISTD_H #include <unistd.h> #endif #if HAVE_NETINET_IN_H #include <netinet/in.h> #endif #if HAVE_SYS_TYPES_H #include <sys/types.h> #endif #if HAVE_SYS_SOCKET_H #include <sys/socket.h> #endif #if HAVE_FCNTL_H #include <fcntl.h> #endif #if HAVE_SYS_UN_H #include <sys/un.h> #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 */ rlim_t maximize_fdlimit(void) { #ifndef WIN32 struct rlimit r; static int maxfds_set = 0; static rlim_t maxfds = 0; if (maxfds_set) return maxfds; #ifndef RLIMIT_NOFILE #ifdef RLIMIT_OFILE #define RLIMIT_NOFILE RLIMIT_OFILE #else #error Neither RLIMIT_NOFILE nor RLIMIT_OFILE defined #endif #endif if (!getrlimit(RLIMIT_NOFILE, &r)) { maxfds = r.rlim_cur; 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; } maxfds_set = 1; return maxfds; } #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) { Strncpy(buffer, get_unixsock_path(ss), sizeof(buffer)); return buffer; } #endif Snprintf(buffer, sizeof(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 "<address>:<port>". */ 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); }