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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) 1999-2023 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).
*
***************************************************************************/
/* $Id$ */
#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) {
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 "<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);
}
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