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diff --git a/src/nmap_manpage.html b/src/nmap_manpage.html new file mode 100644 index 0000000..9fa59cf --- /dev/null +++ b/src/nmap_manpage.html @@ -0,0 +1,1176 @@ +<HTML> +<HEAD> +<TITLE>Nmap network security scanner man page</TITLE> +</HEAD> +<BODY> +<H1>Nmap network security scanner man page</H1> +<HR> +<PRE> +<!-- Manpage converted by man2html 3.0.1 --> +<B>NMAP(1)</B> <B>NMAP(1)</B> + + + + +</PRE> +<H2>NAME</H2><PRE> + nmap - Network exploration tool and security scanner + + +</PRE> +<H2>SYNOPSIS</H2><PRE> + <B>nmap</B> [Scan Type(s)] [Options] <host or net #1 ... [#N]> + + +</PRE> +<H2>DESCRIPTION</H2><PRE> + <I>Nmap</I> is designed to allow system administrators and curious individuals + to scan large networks to determine which hosts are up and what ser- + vices they are offering. <I>nmap</I> supports a large number of scanning + techniques such as: UDP, TCP connect(), TCP SYN (half open), ftp proxy + (bounce attack), ICMP (ping sweep), FIN, ACK sweep, Xmas Tree, SYN + sweep, IP Protocol, and Null scan. See the <I>Scan</I> <I>Types</I> section for more + details. nmap also offers a number of advanced features such as remote + OS detection via TCP/IP fingerprinting, stealth scanning, dynamic delay + and retransmission calculations, parallel scanning, detection of down + hosts via parallel pings, decoy scanning, port filtering detection, + direct (non-portmapper) RPC scanning, fragmentation scanning, and flex- + ible target and port specification. + + Significant effort has been put into decent nmap performance for non- + root users. Unfortunately, many critical kernel interfaces (such as + raw sockets) require root privileges. nmap should be run as root when- + ever possible (not setuid root, of course). + + The result of running nmap is usually a list of interesting ports on + the machine(s) being scanned (if any). Nmap always gives the port’s + "well known" service name (if any), number, state, and protocol. The + state is either "open", "closed" "filtered", or "unfiltered". Open + means that the target machine will accept() connections on that port. + Closed ports are not listening for connections (they have no applica- + tion associated with them). Filtered means that a firewall, filter, or + other network obstacle is covering the port and preventing nmap from + determining whether the port is open. Unfiltered means that the port + is known by nmap to be closed and no firewall/filter seems to be inter- + fering with nmap’s attempts to determine this. Unfiltered ports are + the common case and are only shown when most of the scanned ports are + in the filtered state. In some cases, Nmap cannot distinguish between + filtered ports and those that are either open or closed. For example, + a port that does not respond to a FIN Scan could be either open or fil- + tered. In these cases, Nmap lists ports as "open|filtered" or + "closed|filtered". + + Depending on options used, nmap may also report the following charac- + teristics of the remote host: OS in use, TCP sequentiality, usernames + running the programs which have bound to each port, the DNS name, + whether the host is a smurf address, and a few others. + + +</PRE> +<H2>OPTIONS</H2><PRE> + Options that make sense together can generally be combined. Some + options are specific to certain scan modes. <I>nmap</I> tries to catch and + warn the user about psychotic or unsupported option combinations. + + If you are impatient, you can skip to the <I>examples</I> section at the end, + which demonstrates common usage. You can also run <B>nmap</B> <B>-h</B> for a quick + reference page listing all the options. + + <B>SCAN</B> <B>TYPES</B> + + <B id="-sS">-sS</B> TCP SYN scan: This technique is often referred to as "half-open" + scanning, because you don’t open a full TCP connection. You send + a SYN packet, as if you are going to open a real connection and + you wait for a response. A SYN|ACK indicates the port is listen- + ing. A RST is indicative of a non-listener. If a SYN|ACK is + received, a RST is immediately sent to tear down the connection + (actually our OS kernel does this for us). The primary advantage + to this scanning technique is that fewer sites will log it. + Unfortunately you need root privileges to build these custom SYN + packets. This is the default scan type for privileged users. + + <B id="-sT">-sT</B> TCP connect() scan: This is the most basic form of TCP scanning. + The connect() system call provided by your operating system is + used to open a connection to every interesting port on the + machine. If the port is listening, connect() will succeed, oth- + erwise the port isn’t reachable. One strong advantage to this + technique is that you don’t need any special privileges. Any + user on most UNIX boxes is free to use this call. + + This sort of scan is easily detectable as target host logs will + show a bunch of connection and error messages for the services + which accept() the connection just to have it immediately shut- + down. This is the default scan type for unprivileged users. + + <B id="-sF">-sF</B> <B id="-sX">-sX</B> <B id="-sN">-sN</B> + Stealth FIN, Xmas Tree, or Null scan modes: There are times when + even SYN scanning isn’t clandestine enough. Some firewalls and + packet filters watch for SYNs to restricted ports, and programs + like Synlogger and Courtney are available to detect these scans. + These advanced scans, on the other hand, may be able to pass + through unmolested. + + The idea is that closed ports are required to reply to your + probe packet with an RST, while open ports must ignore the pack- + ets in question (see RFC 793 pp 64). Filered ports also tend to + drop probes without a response, so Nmap considers ports + "open|filtered" when it fails to elicit any response. If you + add version detection (-sV), it will try to verify whether the + ports are actually open and change the state as appropriate. + The FIN scan uses a bare (surprise) FIN packet as the probe, + while the Xmas tree scan turns on the FIN, URG, and PUSH flags. + The Null scan turns off all flags. Unfortunately Microsoft + (like usual) decided to completely ignore the standard and do + things their own way. Thus this scan type will not work against + systems running Windows95/NT. On the positive side, this is a + good way to distinguish between the two platforms. If the scan + finds open ports, you know the machine is not a Windows box. If + a -sF,-sX,or -sN scan shows all ports closed, yet a SYN (-sS) + scan shows ports being opened, you are probably looking at a + Windows box. This is less useful now that nmap has proper OS + detection built in. There are also a few other systems that are + broken in the same way Windows is. They include Cisco, BSDI, + HP/UX, MVS, and IRIX. All of the above send resets from the + open ports when they should just drop the packet. + + <B id="-sP">-sP</B> Ping scanning: Sometimes you only want to know which hosts on a + network are up. Nmap can do this by sending ICMP echo request + packets to every IP address on the networks you specify. Hosts + that respond are up. Unfortunately, some sites such as + microsoft.com block echo request packets. Thus nmap can also + send a TCP ack packet to (by default) port 80. If we get an RST + back, that machine is up. A third technique involves sending a + SYN packet and waiting for a RST or a SYN/ACK. For non-root + users, a connect() method is used. + + By default (for root users), nmap uses both the ICMP and ACK + techniques in parallel. You can change these with the <B>-P</B> + options described later. + + Note that pinging is done by default anyway, and only hosts that + respond are scanned. Only use this option if you wish to ping + sweep <B>without</B> doing any actual port scans. + + <B id="-sV">-sV</B> Version detection: After TCP and/or UDP ports are discovered + using one of the other scan methods, version detection communi- + cates with those ports to try and determine more about what is + actually running. A file called nmap-service-probes is used to + determine the best probes for detecting various services and the + match strings to expect. Nmap tries to determine the service + protocol (e.g. ftp, ssh, telnet, http), the application name + (e.g. ISC Bind, Apache httpd, Solaris telnetd), the version num- + ber, and sometimes miscellaneous details like whether an X + server is open to connections or the SSH protocol version). If + Nmap was compiled with OpenSSL support, it will connect to SSL + servers to deduce the service listening behind the encryption. + When RPC services are discovered, the Nmap RPC grinder is used + to determine the RPC program and version numbers. Some UDP + ports are left in the "open|filtered" state after a UDP scan is + unable to determine whether the port is open or filtered. Ver- + sion detection will try to elicit a response from these ports + (just as it does with open ports), and change the state to open + if it succeeds. Note that the Nmap -A option also enables this + feature. For a much more detailed description of Nmap service + detection, read our paper at http://www.insecure.org/nmap/ver- + sionscan.html . There is a related --version_trace option which + causes Nmap to print out extensive debugging info about what + version scanning is doing (this is a subset of what you would + get with --packet_trace). + + <B id="-sU">-sU</B> UDP scans: This method is used to determine which UDP (User + Datagram Protocol, RFC 768) ports are open on a host. The tech- + nique is to send 0 byte UDP packets to each port on the target + machine. If we receive an ICMP port unreachable message, then + the port is closed. If a UDP response is received to the probe + (unusual), the port is open. If we get no response at all, the + state is "open|filtered", meaning that the port is either open + or packet filters are blocking the communication. Versions scan + (-sV) can be used to help differentiate the truly open ports + from the filtered ones. + + Some people think UDP scanning is pointless. I usually remind + them of the Solaris rpcbind hole. Rpcbind can be found hiding on + an undocumented UDP port somewhere above 32770. So it doesn’t + matter that 111 is blocked by the firewall. But can you find + which of the more than 30,000 high ports it is listening on? + With a UDP scanner you can! There is also the cDc Back Orifice + backdoor program which hides on a configurable UDP port on Win- + dows machines. Not to mention the many commonly vulnerable ser- + vices that utilize UDP such as snmp, tftp, NFS, etc. + + Unfortunately UDP scanning is sometimes painfully slow since + most hosts implement a suggestion in RFC 1812 (section 4.3.2.8) + of limiting the ICMP error message rate. For example, the Linux + kernel (in net/ipv4/icmp.h) limits destination unreachable mes- + sage generation to 80 per 4 seconds, with a 1/4 second penalty + if that is exceeded. Solaris has much more strict limits (about + 2 messages per second) and thus takes even longer to scan. <I>nmap</I> + detects this rate limiting and slows down accordingly, rather + than flood the network with useless packets that will be ignored + by the target machine. + + As is typical, Microsoft ignored the suggestion of the RFC and + does not seem to do any rate limiting at all on Win95 and NT + machines. Thus we can scan all 65K ports of a Windows machine + <B>very</B> quickly. Whoop! + + + <B id="-sO">-sO</B> IP protocol scans: This method is used to determine which IP + protocols are supported on a host. The technique is to send raw + IP packets without any further protocol header to each specified + protocol on the target machine. If we receive an ICMP protocol + unreachable message, then the protocol is not in use. Otherwise + we assume it is open. Note that some hosts (AIX, HP-UX, Digital + UNIX) and firewalls may not send protocol unreachable messages. + This causes all of the protocols to appear "open". + + Because the implemented technique is very similar to UDP port + scanning, ICMP rate limit might apply too. But the IP protocol + field has only 8 bits, so at most 256 protocols can be probed + which should be possible in reasonable time anyway. + + <B id="-sI">-sI</B> <B><zombie</B> <B>host[:probeport]></B> + Idlescan: This advanced scan method allows for a truly blind TCP + port scan of the target (meaning no packets are sent to the tar- + get from your real IP address). Instead, a unique side-channel + attack exploits predictable "IP fragmentation ID" sequence gen- + eration on the zombie host to glean information about the open + ports on the target. IDS systems will display the scan as com- + ing from the zombie machine you specify (which must be up and + meet certain criteria). I wrote an informal paper about this + technique at http://www.insecure.org/nmap/idlescan.html . + + Besides being extraordinarily stealthy (due to its blind + nature), this scan type permits mapping out IP-based trust rela- + tionships between machines. The port listing shows open ports + <I>from</I> <I>the</I> <I>perspective</I> <I>of</I> <I>the</I> <I>zombie</I> <I>host.</I> So you can try scan- + ning a target using various zombies that you think might be + trusted (via router/packet filter rules). Obviously this is + crucial information when prioritizing attack targets. Other- + wise, you penetration testers might have to expend considerable + resources "owning" an intermediate system, only to find out that + its IP isn’t even trusted by the target host/network you are + ultimately after. + + You can add a colon followed by a port number if you wish to + probe a particular port on the zombie host for IPID changes. + Otherwise Nmap will use the port it uses by default for "tcp + pings". + + <B id="-sA">-sA</B> ACK scan: This advanced method is usually used to map out fire- + wall rulesets. In particular, it can help determine whether a + firewall is stateful or just a simple packet filter that blocks + incoming SYN packets. + + This scan type sends an ACK packet (with random looking acknowl- + edgment/sequence numbers) to the ports specified. If a RST + comes back, the ports is classified as "unfiltered". If nothing + comes back (or if an ICMP unreachable is returned), the port is + classified as "filtered". Note that <I>nmap</I> usually doesn’t print + "unfiltered" ports, so getting <B>no</B> ports shown in the output is + usually a sign that all the probes got through (and returned + RSTs). This scan will obviously never show ports in the "open" + state. + + <B id="-sW">-sW</B> Window scan: This advanced scan is very similar to the ACK scan, + except that it can sometimes detect open ports as well as fil- + tered/unfiltered due to an anomaly in the TCP window size + reporting by some operating systems. Systems vulnerable to this + include at least some versions of AIX, Amiga, BeOS, BSDI, Cray, + Tru64 UNIX, DG/UX, OpenVMS, Digital UNIX, FreeBSD, HP-UX, OS/2, + IRIX, MacOS, NetBSD, OpenBSD, OpenStep, QNX, Rhapsody, SunOS + 4.X, Ultrix, VAX, and VxWorks. See the nmap-hackers mailing + list archive for a full list. + + <B id="-sR">-sR</B> RPC scan. This method works in combination with the various + port scan methods of Nmap. It takes all the TCP/UDP ports found + open and then floods them with SunRPC program NULL commands in + an attempt to determine whether they are RPC ports, and if so, + what program and version number they serve up. Thus you can + effectively obtain the same info as "rpcinfo -p" even if the + target’s portmapper is behind a firewall (or protected by TCP + wrappers). Decoys do not currently work with RPC scan, at some + point I may add decoy support for UDP RPC scans. This is auto- + matically enabled as part of version scan (-sV) if you request + that. + + <B id="-sL">-sL</B> List scan. This method simply generates and prints a list of IP + addresses or hostnames without actually pinging or port scanning + them. DNS name resolution will be performed unless you use -n. + + <B id="-b">-b</B> <B><ftp</B> <B>relay</B> <B>host></B> + FTP bounce attack: An interesting "feature" of the ftp protocol + (RFC 959) is support for "proxy" ftp connections. In other + words, I should be able to connect from evil.com to the FTP + server of target.com and request that the server send a file + ANYWHERE on the Internet! Now this may have worked well in 1985 + when the RFC was written. But in today’s Internet, we can’t have + people hijacking ftp servers and requesting that data be spit + out to arbitrary points on the Internet. As *Hobbit* wrote back + in 1995, this protocol flaw "can be used to post virtually + untraceable mail and news, hammer on servers at various sites, + fill up disks, try to hop firewalls, and generally be annoying + and hard to track down at the same time." What we will exploit + this for is to (surprise, surprise) scan TCP ports from a + "proxy" ftp server. Thus you could connect to an ftp server + behind a firewall, and then scan ports that are more likely to + be blocked (139 is a good one). If the ftp server allows reading + from and writing to some directory (such as /incoming), you can + send arbitrary data to ports that you do find open (nmap doesn’t + do this for you though). + + The argument passed to the "b" option is the host you want to + use as a proxy, in standard URL notation. The format is: <I>user-</I> + <I>name:password@server:port.</I> Everything but <I>server</I> is optional. + To determine what servers are vulnerable to this attack, you can + see my article in <I>Phrack</I> 51. An updated version is available at + the <I>nmap</I> URL (http://www.insecure.org/nmap). + + <B>GENERAL</B> <B>OPTIONS</B> + None of these are required but some can be quite useful. Note + that the -P options can now be combined -- you can increase your + odds of penetrating strict firewalls by sending many probe types + using different TCP ports/flags and ICMP codes. + + <B id="-P0">-P0</B> Do not try to ping hosts at all before scanning them. This + allows the scanning of networks that don’t allow ICMP echo + requests (or responses) through their firewall. microsoft.com + is an example of such a network, and thus you should always use + <B>-P0</B> or <B>-PS80</B> when portscanning microsoft.com. Note that "ping" + in this context may involve more than the traditional ICMP echo + request packet. Nmap supports many such probes, including arbi- + trary combinations of TCP, UDP, and ICMP probes. By default, + Nmap sends an ICMP echo request and a TCP ACK packet to port 80. + + <B id="-PA">-PA</B> <B>[portlist]</B> + Use TCP ACK "ping" to determine what hosts are up. Instead of + sending ICMP echo request packets and waiting for a response, we + spew out TCP ACK packets throughout the target network (or to a + single machine) and then wait for responses to trickle back. + Hosts that are up should respond with a RST. This option pre- + serves the efficiency of only scanning hosts that are up while + still allowing you to scan networks/hosts that block ping pack- + ets. For non root UNIX users, we use connect() and thus a SYN + is actually being sent. To set the destination ports of the + probe packets use -PA<port1>[,port2][...]. The default port is + 80, since this port is often not filtered out. Note that this + option now accepts multiple, comma-separated port numbers. + + <B id="-PS">-PS</B> <B>[portlist]</B> + This option uses SYN (connection request) packets instead of ACK + packets for root users. Hosts that are up should respond with a + RST (or, rarely, a SYN|ACK). You can set the destination ports + in the same manner as -PA above. + + <B id="-PR">-PR</B> This option specifies a raw ethernet ARP ping. It cannot be + used in combination with any of the other ping types. When the + target machines are on the same network you are scanning from, + this is the fastest and most reliable (because it goes below IP- + level filters) ping method. Nmap sends an IPv4-to-Ethernet ARP + request for each target IP, and watches for any ARP response. + <B>-PU</B> <B>[portlist]</B> This option sends UDP probes to the specified + hosts, expecting an ICMP port unreachable packet (or possibly a + UDP response if the port is open) if the host is up. Since many + UDP services won’t reply to an empty packet, your best bet might + be to send this to expected-closed ports rather than open ones. + + <B id="-PE">-PE</B> This option uses a true ping (ICMP echo request) packet. It + finds hosts that are up and also looks for subnet-directed + broadcast addresses on your network. These are IP addresses + which are externally reachable and translate to a broadcast of + incoming IP packets to a subnet of computers. These should be + eliminated if found as they allow for numerous denial of service + attacks (Smurf is the most common). + + <B id="-PP">-PP</B> Uses an ICMP timestamp request (type 13) packet to find listen- + ing hosts. + + <B id="-PM">-PM</B> Same as <B>-PE</B> and <B>-PP</B> except uses a netmask request (ICMP type + 17). + + <B>-PB</B> This is the default ping type. It uses both the ACK ( <B>-PA</B> ) and + ICMP echo request ( <B>-PE</B> ) sweeps in parallel. This way you can + get firewalls that filter either one (but not both). The TCP + probe destination port can be set in the same manner as with -PA + above. Note that this flag is now deprecated as pingtype flags + can now be used in combination. So you should use both "PE" and + "PA" (or rely on the default behavior) to achieve this same + effect. + + <B id="-O">-O</B> This option activates remote host identification via TCP/IP fin- + gerprinting. In other words, it uses a bunch of techniques to + detect subtleties in the underlying operating system network + stack of the computers you are scanning. It uses this informa- + tion to create a "fingerprint" which it compares with its + database of known OS fingerprints (the nmap-os-fingerprints + file) to decide what type of system you are scanning. + + If Nmap is unable to guess the OS of a machine, and conditions + are good (e.g. at least one open port), Nmap will provide a URL + you can use to submit the fingerprint if you know (for sure) the + OS running on the machine. By doing this you contribute to the + pool of operating systems known to nmap and thus it will be more + accurate for everyone. Note that if you leave an IP address on + the form, the machine may be scanned when we add the fingerprint + (to validate that it works). + + The -O option also enables several other tests. One is the + "Uptime" measurement, which uses the TCP timestamp option (RFC + 1323) to guess when a machine was last rebooted. This is only + reported for machines which provide this information. + + Another test enabled by -O is TCP Sequence Predictability Clas- + sification. This is a measure that describes approximately how + hard it is to establish a forged TCP connection against the + remote host. This is useful for exploiting source-IP based + trust relationships (rlogin, firewall filters, etc) or for hid- + ing the source of an attack. The actual difficulty number is + based on statistical sampling and may fluctuate. It is gener- + ally better to use the English classification such as "worthy + challenge" or "trivial joke". This is only reported in normal + output with -v. + + When verbose mode (-v) is on with -O, IPID Sequence Generation + is also reported. Most machines are in the "incremental" class, + which means that they increment the "ID" field in the IP header + for each packet they send. This makes them vulnerable to sev- + eral advanced information gathering and spoofing attacks. + + <B id="--osscan_limit">--osscan_limit</B> + OS detection is far more effective if at least one open and one + closed TCP port are found. Set this option and Nmap will not + even try OS detection against hosts that do not meet this crite- + ria. This can save substantial time, particularly on -P0 scans + against many hosts. It only matters when OS detection is + requested (-O or -A options). + + <B id="-A">-A</B> This option enables _a_dditional _a_dvanced and _a_ggressive + options. I haven’t decided exactly which it stands for yet :). + Presently this enables OS Detection (-O) and version scanning + (-sV). More features may be added in the future. The point is + to enable a comprehensive set of scan options without people + having to remember a large set of flags. This option only + enables features, and not timing options (such as -T4) or ver- + bosity options (-v) that you might wan’t as well. + + <B id="-6">-6</B> This options enables IPv6 support. All targets must be IPv6 if + this option is used, and they can be specified via normal DNS + name (AAAA record) or as a literal IP address such as + 3ffe:501:4819:2000:210:f3ff:fe03:4d0 . Currently, connect() TCP + scan and TCP connect() Ping scan are supported. If you need UDP + or other scan types, have a look at http://nmap6.source- + forge.net/ . + + <B id="--send_eth">--send_eth</B> + Asks Nmap to send packets at the raw ethernet (data link) layer + rather than the higher IP (network) layer. By default, Nmap + chooses the one which is generally best for the platform it is + running on. Raw sockets (IP layer) are generally most efficient + for UNIX machines, while ethernet frames work best on the many + Windows versions where Microsoft has disabled raw sockets sup- + port. Nmap still uses raw IP packets when there is no other + choice (such as non-ethernet connections). + + <B id="--send_ip">--send_ip</B> + Asks Nmap to send packets via raw IP sockets rather than sending + lower level ethernet frames. It is the complement to the + --send-eth option.discussed previously. + + <B id="--spoof_mac">--spoof_mac</B> <B>[mac,</B> <B>prefix,</B> <B>or</B> <B>vendor</B> <B>substring]</B> + Ask Nmap to use the given MAC address for all of the raw ether- + net frames it sends. The MAC given can take several formats. + If it is simply the string "0", Nmap chooses a completely random + MAC for the session. If the given string is an even number of + hex digits (with the pairs optionally separated by a colon), + Nmap will use those as the MAC. If less than 12 hex digits are + provided, Nmap fills in the remainder of the 6 bytes with random + values. If the argument isn’t a 0 or hex string, Nmap looks + through the nmap-mac-prefixes to find a vendor name containing + the given string (it is case insensitive). If a match is found, + Nmap uses the vendor’s OUI (3-byte prefix) and fills out the + remaining 3 bytes randomly. Valid --spoof_mac argument examples + are "Apple", "0", "01:02:03:04:05:06", "deadbeefcafe", "0020F2", + and "Cisco". + + <B id="-f">-f</B> This option causes the requested scan (including ping scans) to + use tiny fragmented IP packets. The idea is to split up the TCP + header over several packets to make it harder for packet fil- + ters, intrusion detection systems, and other annoyances to + detect what you are doing. Be careful with this! Some programs + have trouble handling these tiny packets. The old-school sniffer + named Sniffit segmentation faulted immediately upon receiving + the first fragment. Specify this option once, and Nmap splits + the packets into 8 bytes or less after the IP header. So a + 20-byte TCP header would be split into 3 packets. + Two with eight bytes of the TCP header, and one with the final + four. Of course each fragment also has an IP header. Specify + -f again to use 16 bytes per fragment (reducing the number of + fragments). Or you can specify your own offset size with the + --mtu option. Don’t also specify -f if you use --mtu. The off- + set must be a multiple of 8. While fragmented packets won’t get + by packet filters and firewalls that queue all IP fragments, + such as the CONFIG_IP_ALWAYS_DEFRAG option in the Linux kernel, + some networks can’t afford the performance hit this causes and + thus leave it disabled. Some source systems defragment outgoing + packets in the kernel. Linux with the ip tables connection + tracking module is one such example. Do a scan with a sniffer + such as ethereal running to ensure that sent packets are frag- + mented. + + Note that I do not yet have this option working on all systems. + It works fine for my Linux, FreeBSD, and OpenBSD boxes and some + people have reported success with other *NIX variants. + + <B id="-v">-v</B> Verbose mode. This is a highly recommended option and it gives + out more information about what is going on. You can use it + twice for greater effect. You can also use <B>-d</B> a few times if + you really want to get crazy with scrolling the screen! + + <B>-h</B> This handy option display a quick reference screen of nmap usage + options. As you may have noticed, this man page is not exactly + a "quick reference" :) + + <B id="-oN">-oN</B> <B><logfilename></B> + This logs the results of your scans in a normal <B>human</B> <B>readable</B> + form into the file you specify as an argument. + + <B id="-oX">-oX</B> <B><logfilename></B> + This logs the results of your scans in <B>XML</B> form into the file + you specify as an argument. This allows programs to easily cap- + ture and interpret Nmap results. You can give the argument "-" + (without quotes) to shoot output into stdout (for shell + pipelines, etc). In this case normal output will be suppressed. + Watch out for error messages if you use this (they will still go + to stderr). Also note that "-v" may cause some extra informa- + tion to be printed. The Document Type Definition (DTD) defining + the XML output structure is available at http://www.inse- + cure.org/nmap/data/nmap.dtd . + + <B id="--stylesheet">--stylesheet</B> <B><filename></B> + Nmap ships with an XSL stylesheet named nmap.xsl for viewing or + translating XML output to HTML. The XML output includes an xml- + stylesheet directive which points to nmap.xml where it was ini- + tially installed by Nmap (or in the current working directory on + Windows). Simply load Nmap’s XML output in a modern web browser + and it should retrieve nmap.xsl from the filesystem and use it + to render results. If you wish to use a different stylesheet, + specify it as the argument to --stylesheet. You must pass the + full pathname or URL. One common invocation is --stylesheet + http://www.insecure.org/nmap/data/nmap.xsl . This tells a + browser to load the latest version of the stylesheet from Inse- + cure.Org. This makes it easier to view results on a machine + that doesn’t have Nmap (and thus nmap.xsl) installed. So the + URL is often more useful, but the local filesystem locaton of + nmap.xsl is used by default for privacy reasons. + + <B id="--no_stylesheet">--no_stylesheet</B> + Specify this option to prevent Nmap from associating any XSL + stylesheet with its XML output. The xml-stylesheet directive is + omitted. + + <B id="-oG">-oG</B> <B><logfilename></B> + This logs the results of your scans in a <B>grepable</B> form into the + file you specify as an argument. This simple format provides + all the information on one line (so you can easily grep for port + or OS information and see all the IPs. This used to be the pre- + ferred mechanism for programs to interact with Nmap, but now we + recommend XML output (-oX instead). This simple format may not + contain as much information as the other formats. You can give + the argument "-" (without quotes) to shoot output into stdout + (for shell pipelines, etc). In this case normal output will be + suppressed. Watch out for error messages if you use this (they + will still go to stderr). Also note that "-v" will cause some + extra information to be printed. + + <B id="-oA">-oA</B> <B><basefilename></B> + This tells Nmap to log in ALL the major formats (normal, + grepable, and XML). You give a base for the filename, and the + output files will be base.nmap, base.gnmap, and base.xml. + + <B id="-oS">-oS</B> <B><logfilename></B> + thIs l0gz th3 r3suLtS of YouR ScanZ iN a <B>s|<ipT</B> <B>kiDd|3</B> f0rM iNto + THe fiL3 U sPecfy 4s an arGuMEnT! U kAn gIv3 the 4rgument "-" + (wItHOUt qUOteZ) to sh00t output iNT0 stDouT!@!! + + <B id="--resume">--resume</B> <B><logfilename></B> + A network scan that is canceled due to control-C, network out- + age, etc. can be resumed using this option. The logfilename + must be either a normal (-oN) or grepable (-oG) log from the + aborted scan. No other options can be given (they will be the + same as the aborted scan). Nmap will start on the machine after + the last one successfully scanned in the log file. + + <B id="--exclude">--exclude</B> <B><host1</B> <B>[,host2][,host3],..."></B> + Specifies a list of targets (hosts, ranges, netblocks) that + should be excluded from a scan. Useful to keep from scanning + yourself, your ISP, particularly sensitive hosts, etc. + + <B>--excludefile</B> <B><exclude_file></B> + Same functionality as the --exclude option, only the excluded + targets are provided in an newline-delimited exclude_file rather + than on the command line. + + <B id="--allports">--allports</B> + Causes version detection (-sV) to scan all open ports found, + including those excluded as dangerous (likely to cause crashes + or other problems) in nmap-service-probes. + + <B id="--append_output">--append_output</B> + Tells Nmap to append scan results to any output files you have + specified rather than overwriting those files. + + <B id="-iL">-iL</B> <B><inputfilename></B> + Reads target specifications from the file specified RATHER than + from the command line. The file should contain a list of host + or network expressions separated by spaces, tabs, or newlines. + Use a hyphen (-) as <I>inputfilename</I> if you want nmap to read host + expressions from stdin (like at the end of a pipe). See the + section <I>target</I> <I>specification</I> for more information on the expres- + sions you fill the file with. + + <B id="-iR">-iR</B> <B><num</B> <B>hosts></B> + This option tells Nmap to generate its own hosts to scan by sim- + ply picking random numbers :). It will never end after the + given number of IPs has been scanned -- use 0 for a never-ending + scan. This option can be useful for statistical sampling of the + Internet to estimate various things. If you are ever really + bored, try <I>nmap</I> <I>-sS</I> <I>-PS80</I> <I>-iR</I> <I>0</I> <I>-p</I> <I>80</I> to find some web servers + to look at. + + <B id="-p">-p</B> <B><port</B> <B>ranges></B> + This option specifies what ports you want to specify. For exam- + ple "-p 23" will only try port 23 of the target host(s). "-p + 20-30,139,60000-" scans ports between 20 and 30, port 139, and + all ports greater than 60000. The default is to scan all ports + between 1 and 1024 as well as any ports listed in the services + file which comes with nmap. For IP protocol scanning (-sO), + this specifies the protocol number you wish to scan for (0-255). + + When scanning both TCP and UDP ports, you can specify a particu- + lar protocol by preceding the port numbers by "T:" or "U:". The + qualifier lasts until you specify another qualifier. For exam- + ple, the argument "-p U:53,111,137,T:21-25,80,139,8080" would + scan UDP ports 53,111,and 137, as well as the listed TCP ports. + Note that to scan both UDP & TCP, you have to specify -sU and at + least one TCP scan type (such as -sS, -sF, or -sT). If no pro- + tocol qualifier is given, the port numbers are added to all pro- + tocol lists. + + <B id="-F">-F</B> <B>Fast</B> <B>scan</B> <B>mode.</B> + Specifies that you only wish to scan for ports listed in the + services file which comes with nmap (or the protocols file for + -sO). This is obviously much faster than scanning all 65535 + ports on a host. + + <B id="-D">-D</B> <B><decoy1</B> <B>[,decoy2][,ME],...></B> + Causes a decoy scan to be performed which makes it appear to the + remote host that the host(s) you specify as decoys are scanning + the target network too. Thus their IDS might report 5-10 port + scans from unique IP addresses, but they won’t know which IP was + scanning them and which were innocent decoys. While this can be + defeated through router path tracing, response-dropping, and + other "active" mechanisms, it is generally an extremely effec- + tive technique for hiding your IP address. + + Separate each decoy host with commas, and you can optionally use + "ME" as one of the decoys to represent the position you want + your IP address to be used. If you put "ME" in the 6th position + or later, some common port scan detectors (such as Solar + Designer’s excellent scanlogd) are unlikely to show your IP + address at all. If you don’t use "ME", nmap will put you in a + random position. + + Note that the hosts you use as decoys should be up or you might + accidentally SYN flood your targets. Also it will be pretty + easy to determine which host is scanning if only one is actually + up on the network. You might want to use IP addresses instead + of names (so the decoy networks don’t see you in their name- + server logs). + + Also note that some "port scan detectors" will firewall/deny + routing to hosts that attempt port scans. The problem is that + many scan types can be forged (as this option demonstrates). So + attackers can cause such a machine to sever connectivity with + important hosts such as its internet gateway, DNS TLD servers, + sites like Windows Update, etc. Most such software offers + whitelist capabilities, but you are unlikely to enumerate all of + the critical machines. For this reason we never recommend tak- + ing action against port scans that can be forged, including SYN + scans, UDP scans, etc. The machine you block could just be a + decoy. + + Decoys are used both in the initial ping scan (using ICMP, SYN, + ACK, or whatever) and during the actual port scanning phase. + Decoys are also used during remote OS detection ( <B>-O</B> ). + + It is worth noting that using too many decoys may slow your scan + and potentially even make it less accurate. Also, some ISPs + will filter out your spoofed packets, although many (currently + most) do not restrict spoofed IP packets at all. + + <B id="-S">-S</B> <B><IP_Address></B> + In some circumstances, <I>nmap</I> may not be able to determine your + source address ( <I>nmap</I> will tell you if this is the case). In + this situation, use -S with your IP address (of the interface + you wish to send packets through). + + Another possible use of this flag is to spoof the scan to make + the targets think that <B>someone</B> <B>else</B> is scanning them. Imagine a + company being repeatedly port scanned by a competitor! This is + not a supported usage (or the main purpose) of this flag. I + just think it raises an interesting possibility that people + should be aware of before they go accusing others of port scan- + ning them. <B>-e</B> would generally be required for this sort of + usage. + + <B id="-e">-e</B> <B><interface></B> + Tells nmap what interface to send and receive packets on. Nmap + should be able to detect this but it will tell you if it cannot. + + <B id="-g">--source_port</B> <B><portnumber></B> + Sets the source port number used in scans. Many naive firewall + and packet filter installations make an exception in their rule- + set to allow DNS (53) or FTP-DATA (20) packets to come through + and establish a connection. Obviously this completely subverts + the security advantages of the firewall since intruders can just + masquerade as FTP or DNS by modifying their source port. Obvi- + ously for a UDP scan you should try 53 first and TCP scans + should try 20 before 53. Note that this is only a request -- + nmap will honor it only if and when it is able to. For example, + you can’t do TCP ISN sampling all from one host:port to one + host:port, so nmap changes the source port even if you used this + option. This is an alias for the shorter, but harder to remem- + ber, -g option. + + Be aware that there is a small performance penalty on some scans + for using this option, because I sometimes store useful informa- + tion in the source port number. + + <B id="--data_length">--data_length</B> <B><number></B> + Normally Nmap sends minimalistic packets that only contain a + header. So its TCP packets are generally 40 bytes and ICMP echo + requests are just 28. This option tells Nmap to append the + given number of random bytes to most of the packets it sends. + OS detection (-O) packets are not affected, but most pinging and + portscan packets are. This slows things down, but can be + slightly less conspicuous. + + <B id="-n">-n</B> Tells Nmap to <B>NEVER</B> do reverse DNS resolution on the active IP + addresses it finds. Since DNS is often slow, this can help + speed things up. + + <B id="-R">-R</B> Tells Nmap to <B>ALWAYS</B> do reverse DNS resolution on the target IP + addresses. Normally this is only done when a machine is found + to be alive. + + <B id="-r">-r</B> Tells Nmap <B>NOT</B> to randomize the order in which ports are + scanned. + + <B id="-ttl">--ttl</B> <B><value></B> + Sets the IPv4 time to live field in sent packets to the given + value. + + <B id="--privileged">--privileged</B> + Tells Nmap to simply assume that it is privileged enough to per- + form raw socket sends, packet sniffing, and similar operations + that usually require root privileges on UNIX systems. By + default Nmap bails if such operations are requested but + geteuid() is not zero. --privileged is useful with Linux kernel + capabilities and similar systems that may be configured to allow + unprivileged users to perform raw-packet scans. Be sure to pro- + vide this option flag before any flags for options that require + privileges (SYN scan, OS detection, etc.). The NMAP_PRIVILEGED + variable may be set as an equivalent alternative --privileged. + + <B>--interactive</B> + Starts Nmap in interactive mode, which offers an interactive + Nmap prompt allowing easy launching of multiple scans (either + synchronously or in the background). This is useful for people + who scan from multi-user systems -- they often want to test + their security without letting everyone else on the system know + exactly which systems they are scanning. Use --interactive to + activate this mode and then type usually more familiar and fea- + ture-complete. + + <B id="--randomize_hosts">--randomize_hosts</B> + Tells Nmap to shuffle each group of up to 2048 hosts before it + scans them. This can make the scans less obvious to various + network monitoring systems, especially when you combine it with + slow timing options (see below). + + <B id="-M">-M</B> <B><max</B> <B>sockets></B> + Sets the maximum number of sockets that will be used in parallel + for a TCP connect() scan (the default). This is useful to slow + down the scan a little bit and avoid crashing remote machines. + Another approach is to use -sS, which is generally easier for + machines to handle. + + <B id="--packet_trace">--packet_trace</B> + Tells Nmap to show all the packets it sends and receives in a + tcpdump-like format. This can be tremendously useful for debug- + ging, and is also a good learning tool. + + <B id="--datadir">--datadir</B> <B>[directoryname]</B> + Nmap obtains some special data at runtime in files named nmap- + service-probes, nmap-services, nmap-protocols, nmap-rpc, nmap- + mac-prefixes, and nmap-os-fingerprints. Nmap first searches + these files in the directory option to --datadir. Any files not + found there, are searched for in the directory specified by the + NMAPDIR environmental variable. Next comes ~/.nmap for real and + effective UIDs (POSIX systems only) or location of the Nmap exe- + cutable (Win32 only), and then a compiled-in location such as + /usr/local/share/nmap or /usr/share/nmap . As a last resort, + Nmap will look in the current directory. + + <B>TIMING</B> <B>OPTIONS</B> + Generally Nmap does a good job at adjusting for Network charac- + teristics at runtime and scanning as fast as possible while min- + imizing that chances of hosts/ports going undetected. However, + there are same cases where Nmap’s default timing policy may not + meet your objectives. The following options provide a fine + level of control over the scan timing: + + <B id="-T">-T</B> <B><Paranoid|Sneaky|Polite|Normal|Aggressive|Insane></B> + These are canned timing policies for conveniently expressing + your priorities to Nmap. <B>Paranoid</B> mode scans <B>very</B> slowly in the + hopes of avoiding detection by IDS systems. It serializes all + scans (no parallel scanning) and generally waits at least 5 min- + utes between sending packets. <B>Sneaky</B> is similar, except it only + waits 15 seconds between sending packets. <B>Polite</B> is meant to + ease load on the network and reduce the chances of crashing + machines. It serializes the probes and waits <B>at</B> <B>least</B> 0.4 sec- + onds between them. Note that this is generally at least an + order of magnitude slower than default scans, so only use it + when you need to. <B>Normal</B> is the default Nmap behavior, which + tries to run as quickly as possible without overloading the net- + work or missing hosts/ports. <B>Aggressive</B> This option can make + certain scans (especially SYN scans against heavily filtered + hosts) much faster. It is recommended for impatient folks with + a fast net connection. <B>Insane</B> is only suitable for very fast + networks or where you don’t mind losing some information. It + times out hosts in 15 minutes and won’t wait more than 0.3 sec- + onds for individual probes. It does allow for very quick net- + work sweeps though :). + + You can also reference these by number (0-5). For example, + "-T0" gives you Paranoid mode and "-T5" is Insane mode. If you + wish to set specific timing values such as --max_rtt_timeout or + --host_timeout, place them after any -T option on the command + line. Otherwise the defaults for the selected timing mode will + override your choices. + + <B id="--host_timeout">--host_timeout</B> <B><milliseconds></B> + Specifies the amount of time Nmap is allowed to spend scanning a + single host before giving up on that IP. The default timing + mode has no host timeout. + + <B id="--max_rtt_timeout">--max_rtt_timeout</B> <B><milliseconds></B> + Specifies the maximum amount of time Nmap is allowed to wait for + a probe response before retransmitting or timing out that par- + ticular probe. The default mode sets this to about 9000. + + <B id="--min_rtt_timeout">--min_rtt_timeout</B> <B><milliseconds></B> + When the target hosts start to establish a pattern of responding + very quickly, Nmap will shrink the amount of time given per + probe. This speeds up the scan, but can lead to missed packets + when a response takes longer than usual. With this parameter + you can guarantee that Nmap will wait at least the given amount + of time before giving up on a probe. + + <B id="--initial_rtt_timeout">--initial_rtt_timeout</B> <B><milliseconds></B> + Specifies the initial probe timeout. This is generally only + useful when scanning firewalled hosts with -P0. Normally Nmap + can obtain good RTT estimates from the ping and the first few + probes. The default mode uses 6000. + + <B id="--max_hostgroup">--max_hostgroup</B> <B><numhosts></B> + Specifies the maximum number of hosts that Nmap is allowed to + scan in parallel. Most of the port scan techniques support + multi-host operation, which makes them much quicker. Spreading + the load among multiple target hosts makes the scans gentler. + The downside is increased results latency. You need to wait for + all hosts in a group to finish, rather than having them pop up + one by one. Specify an argument of one for old-style (one host + at a time) Nmap behavior. Note that the ping scanner handles + its own grouping, and ignores this value. + + <B id="--min_hostgroup">--min_hostgroup</B> <B><numhosts></B> + Specifies the minimum host group size (see previous entry). + Large values (such as 50) are often beneficial for unattended + scans, though they do take up more memory. Nmap may override + this preference when it needs to, because a group must all use + the same network interface, and some scan types can only handle + one host at a time. + + <B id="--max_parallelism">--max_parallelism</B> <B><number></B> + Specifies the maximum number of scans Nmap is allowed to perform + in parallel. Setting this to one means Nmap will never try to + scan more than 1 port at a time. It also effects other parallel + scans such as ping sweep, RPC scan, etc. + + <B id="--min_parallelism">--min_parallelism</B> <B><number></B> + Tells Nmap to scan at least the given number of ports in paral- + lel. This can speed up scans against certain firewalled hosts + by an order of magnitude. But be careful -- results will become + unreliable if you push it too far. + + <B id="--scan_delay">--scan_delay</B> <B><milliseconds></B> + Specifies the <B>minimum</B> amount of time Nmap must wait between + probes. This is mostly useful to reduce network load or to slow + the scan way down to sneak under IDS thresholds. Nmap will + sometimes increase the delay itself when it detects many dropped + packets. For example, Solaris systems tend to respond with only + one ICMP port unreachable packet per second during a UDP scan. + So Nmap will try to detect this and lower its rate of UDP probes + to one per second. + + <B id="--max_scan_delay">--max_scan_delay</B> <B><milliseconds></B> + As noted above, Nmap will sometimes enforce a special delay + between sending packets. This can provide more accurate results + while reducing network congestion, but it can slow the scans + down substantially. By default (with no -T options specified), + Nmap allows this delay to grow to one second per probe. This + option allows you to set a lower or higher maximum. Even if you + set it to zero, Nmap will have some delay between packet sends + so that it can wait for responses and avoid having too many out- + standing probes in parallel. + + + +</PRE> +<H2 id="target">TARGET SPECIFICATION</H2><PRE> + Everything that isn’t an option (or option argument) in nmap is treated + as a target host specification. The simplest case is listing single + hostnames or IP addresses on the command line. If you want to scan a + subnet of IP addresses, you can append <B>/mask</B> to the hostname or IP + address. <B>mask</B> must be between 0 (scan the whole Internet) and 32 (scan + the single host specified). Use /24 to scan a class "C" address and + /16 for a class "B". + + Nmap also has a more powerful notation which lets you specify an IP + address using lists/ranges for each element. Thus you can scan the + whole class "B" network 192.168.*.* by specifying "192.168.*.*" or + "192.168.0-255.0-255" or even "192.168.1-50,51-255.1,2,3,4,5-255". And + of course you can use the mask notation: "192.168.0.0/16". These are + all equivalent. If you use asterisks ("*"), remember that most shells + require you to escape them with back slashes or protect them with + quotes. + + Another interesting thing to do is slice the Internet the other way. + Instead of scanning all the hosts in a class "B", scan "*.*.5.6-7" to + scan every IP address that ends in .5.6 or .5.7 Pick your own numbers. + For more information on specifying hosts to scan, see the <I>examples</I> sec- + tion. + + +</PRE> +<H2>EXAMPLES</H2><PRE> + Here are some examples of using nmap, from simple and normal to a lit- + tle more complex/esoteric. Note that actual numbers and some actual + domain names are used to make things more concrete. In their place you + should substitute addresses/names from <B>your</B> <B>own</B> <B>network.</B> I do not + think portscanning other networks is illegal; nor should portscans be + construed by others as an attack. I have scanned hundreds of thousands + of machines and have received only one complaint. But I am not a + lawyer and some (anal) people may be annoyed by <I>nmap</I> probes. Get + permission first or use at your own risk. + + <B>nmap</B> <B>-v</B> <B>target.example.com</B> + + This option scans all reserved TCP ports on the machine target.exam- + ple.com . The -v means turn on verbose mode. + + <B>nmap</B> <B>-sS</B> <B>-O</B> <B>target.example.com/24</B> + + Launches a stealth SYN scan against each machine that is up out of the + 255 machines on class "C" where target.example.com resides. It also + tries to determine what operating system is running on each host that + is up and running. This requires root privileges because of the SYN + scan and the OS detection. + + <B>nmap</B> <B>-sX</B> <B>-p</B> <B>22,53,110,143,4564</B> <B>198.116.*.1-127</B> + + Sends an Xmas tree scan to the first half of each of the 255 possible 8 + bit subnets in the 198.116 class "B" address space. We are testing + whether the systems run sshd, DNS, pop3d, imapd, or port 4564. Note + that Xmas scan doesn’t work on Microsoft boxes due to their deficient + TCP stack. Same goes with CISCO, IRIX, HP/UX, and BSDI boxes. + + <B>nmap</B> <B>-v</B> <B>--randomize_hosts</B> <B>-p</B> <B>80</B> <B>*.*.2.3-5</B> + + Rather than focus on a specific IP range, it is sometimes interesting + to slice up the entire Internet and scan a small sample from each + slice. This command finds all web servers on machines with IP + addresses ending in .2.3, .2.4, or .2.5. If you are root you might as + well add -sS. Also you will find more interesting machines starting at + 127. so you might want to use "127-222" instead of the first asterisks + because that section has a greater density of interesting machines + (IMHO). + + <B>host</B> <B>-l</B> <B>company.com</B> <B>|</B> <B>cut</B> <B>-d</B> <B>-f</B> <B>4</B> <B>|</B> <B>./nmap</B> <B>-v</B> <B>-iL</B> <B>-</B> + + Do a DNS zone transfer to find the hosts in company.com and then feed + the IP addresses to <I>nmap.</I> The above commands are for my GNU/Linux box. + You may need different commands/options on other operating systems. + + +</PRE> +<H2>BUGS</H2><PRE> + Bugs? What bugs? Send me any that you find. Patches are nice too :) + Remember to also send in new OS fingerprints so we can grow the + database. Nmap will give you a submission URL when an appropriate fin- + gerprint is found. + + +</PRE> +<H2>AUTHOR</H2><PRE> + Fyodor <I><fyodor@insecure.org></I> + + +</PRE> +<H2>DISTRIBUTION</H2><PRE> + The newest version of <I>nmap</I> can be obtained from <I>http://www.inse-</I> + <I>cure.org/nmap/</I> + + The Nmap Security Scanner is (C) 1996-2004 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 Founda- + tion; Version 2. This guarantees your right to use, modify, and redis- + tribute this software under certain conditions. If you wish to embed + Nmap technology into proprietary software, we may be willing to sell + alternative licenses (contact sales@insecure.com). Many security scan- + ner vendors already license Nmap technology such as our remote OS fin- + gerprinting database and code, service/version detection system, and + port scanning code. + + Note that the GPL places important restrictions on "derived works", yet + it does not provide a detailed definition of that term. To avoid mis- + understandings, 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-fin- + gerprints 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 just meant to clar- + ify our interpretation of derived works with some common examples. + These restrictions only apply when you actually redistribute Nmap. For + example, nothing stops you from writing and selling a proprietary + front-end to Nmap. Just distribute it by itself, and point people to + http://www.insecure.org/nmap/ to download Nmap. + + We don’t consider these to be added restrictions on top of the GPL, but + just a clarification of how we interpret "derived works" as it applies + to our GPL-licensed Nmap product. This is similar to the way Linus + Torvalds has announced his interpretation of how "derived works" + applies to Linux kernel modules. Our interpretation refers only to + Nmap - we don’t speak for any other GPL products. + + 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 many + security 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@inse- + cure.com for further information. + + As a special exception to the GPL terms, Insecure.Com LLC grants per- + mission 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 Copying.OpenSSL file, and distribute linked com- + binations 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 con- + tract 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 fyodor@insecure.org for possible incorporation into the main distri- + bution. By sending these changes to Fyodor or one the Insecure.Org + development mailing lists, it is assumed that you are offering Fyodor + and Insecure.Com LLC the unlimited, non-exclusive right to reuse, mod- + ify, 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 MER- + CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General + Public License for more details at http://www.gnu.org/copyleft/gpl.html + , or in the COPYING file included with Nmap. + + It should also be noted that Nmap has been known to crash certain + poorly written applications, TCP/IP stacks, and even operating systems. + <B>Nmap</B> <B>should</B> <B>never</B> <B>be</B> <B>run</B> <B>against</B> <B>mission</B> <B>critical</B> <B>systems</B> unless you + are prepared to suffer downtime. We acknowledge here that Nmap may + crash your systems or networks and we disclaim all liability for any + damage or problems Nmap could cause. + + Because of the slight risk of crashes and because a few black hats like + to use Nmap for reconnaissance prior to attacking systems, there are + administrators who become upset and may complain when their system is + scanned. Thus, it is often advisable to request permission before + doing even a light scan of a network. + + Nmap should never be installed with special privileges (eg suid root) + for security reasons. + + This product includes software developed by the Apache Software Founda- + tion (http://www.apache.org/). The <I>Libpcap</I> portable packet capture + library is distributed along with nmap. Libpcap was originally copy- + righted by Van Jacobson, Craig Leres and Steven McCanne, all of the + Lawrence Berkeley National Laboratory, University of California, Berke- + ley, CA. It is now maintained by http://www.tcpdump.org . + + Regular expression support is provided by the PCRE library package, + which is open source software, written by Philip Hazel, and copyright + by the University of Cambridge, England. See http://www.pcre.org/ . + + Nmap can optionally link to the OpenSSL cryptography toolkit, which is + available from http://www.openssl.org/ . + + US Export Control: Insecure.Com LLC believes that Nmap falls under US + ECCN (export control classification number) 5D992. This category is + called ’"Information Security" "software" not controlled by 5D002’. + The only restriction of this classification is AT (anti-terrorism), + which applies to almost all goods and denies export to a handful of + rogue nations such as Iran and North Korea. Thus exporting Nmap does + not require any special license, permit, or other governmental autho- + rization. + + + + <B>NMAP(1)</B> +</PRE> +<HR> +<ADDRESS> +Man(1) output converted with +<a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a> +</ADDRESS> +</BODY> +</HTML> |