Socket - Revision history

Pbug: /* Divert sockets */ update functionality across OS's

2011-10-15T11:48:02Z

Divert sockets: update functionality across OS's

← Older revision		Revision as of 04:48, 15 October 2011
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	[[FreeBSD]] has a way to read/manipulate/write [[OSI]] layer 3 packets which have been diverted from the [[ipfw]] software. This type of socket is limited to [[FreeBSD]].		[[FreeBSD]] has a way to read/manipulate/write [[OSI]] layer 3 packets which have been diverted from the [[ipfw]] software. This type of socket is limited to [[FreeBSD]].

			[[OpenBSD]] has divert sockets which can be diverted with the [[Pf]] packet filter. It does IPv6 diverts too.

	~~At N2K8 hackathon~~ [[~~OpenBSD~~]] ~~implemented basic~~ divert sockets ~~functionality.~~		[[Linux]] has divert sockets too which may have once been limited to only BSD, this is no longer the case. It is available on debian derived linux. Referenced here: http://manpages.ubuntu.com/manpages/hardy/man4/divert.4.html

	~~Note: It~~ may have once been limited to only BSD, this is no longer the case. It is available on debian derived linux. Referenced here: http://manpages.ubuntu.com/manpages/hardy/man4/divert.4.html

	=== Packet sockets ===		=== Packet sockets ===

174.106.79.68: /* Divert sockets */

2010-10-11T14:22:13Z

Divert sockets

← Older revision		Revision as of 07:22, 11 October 2010
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	At N2K8 hackathon [[OpenBSD]] implemented basic divert sockets functionality.		At N2K8 hackathon [[OpenBSD]] implemented basic divert sockets functionality.

			Note: It may have once been limited to only BSD, this is no longer the case. It is available on debian derived linux. Referenced here: http://manpages.ubuntu.com/manpages/hardy/man4/divert.4.html

	=== Packet sockets ===		=== Packet sockets ===

Pbug: /* Packet sockets */

2009-08-12T20:08:46Z

Packet sockets

← Older revision		Revision as of 13:08, 12 August 2009
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	=== Packet sockets ===		=== Packet sockets ===

	[[Linux]] has a way to read [[OSI]] layer 2 frames by means of SO_PACKET sockets. This is limited only to Linux.		[[Linux]] has a way to read [[OSI]] layer 2 frames by means of SO_PACKET sockets. This is limited only to Linux. [[Natally]] uses packet sockets.


	=== How do I see Internet traffic ===		=== How do I see Internet traffic ===

Pbug: /* How do I see Internet traffic */

2008-05-23T19:11:32Z

How do I see Internet traffic

← Older revision		Revision as of 12:11, 23 May 2008
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	A packet [[sniffer]] is a tool that allows one to see packets carried through the [[network interface]] of a host computer.		A packet [[sniffer]] is a tool that allows one to see packets carried through the [[network interface]] of a host computer.

			If all one wants to see is packets or bytes transferred [[netstat]] and/or [[ifconfig]] will do.

Pbug: /* Divert sockets */

2008-05-23T19:05:57Z

Divert sockets

← Older revision		Revision as of 12:05, 23 May 2008
Line 49:		Line 49:


	At N2K8 hackathon OpenBSD implemented basic divert sockets functionality.		At N2K8 hackathon [[OpenBSD]] implemented basic divert sockets functionality.

	=== Packet sockets ===		=== Packet sockets ===

Pbug: /* Divert sockets */

2008-05-23T19:05:03Z

Divert sockets

← Older revision		Revision as of 12:05, 23 May 2008
Line 48:		Line 48:
	[[FreeBSD]] has a way to read/manipulate/write [[OSI]] layer 3 packets which have been diverted from the [[ipfw]] software. This type of socket is limited to [[FreeBSD]].		[[FreeBSD]] has a way to read/manipulate/write [[OSI]] layer 3 packets which have been diverted from the [[ipfw]] software. This type of socket is limited to [[FreeBSD]].


			At N2K8 hackathon OpenBSD implemented basic divert sockets functionality.

	=== Packet sockets ===		=== Packet sockets ===

Pbug: /* INET sockets */

2008-05-23T16:29:50Z

INET sockets

← Older revision		Revision as of 09:29, 23 May 2008
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	=== INET sockets ===		=== INET sockets ===

			[[Image:socket.jpg]]

	In order to communicate with the [[Internet]] a program can communicate with it via the [[Kernel]] which has a built-in [[internet stack]]. Common protocols that one can talk via sockets are [[TCP]] and [[UDP]] as well as [[ICMP]] which is grouped into the raw mode of sockets. When a program is a TCP server the common sequence of [[syscall]]s are socket(2), bind(2), listen(2), and accept(2). When a program is a TCP client the common sequence of [[syscall]]s are socket(2), connect(2). [[TCP]] and [[UDP]] sockets have [[ports]] to identify them. On a system one can use [[netstat]] to see this. In UNIX only [[root]] can bind to ports less than 1024 the rest is available for all users. This is shown here as an example:		In order to communicate with the [[Internet]] a program can communicate with it via the [[Kernel]] which has a built-in [[internet stack]]. Common protocols that one can talk via sockets are [[TCP]] and [[UDP]] as well as [[ICMP]] which is grouped into the raw mode of sockets. When a program is a TCP server the common sequence of [[syscall]]s are socket(2), bind(2), listen(2), and accept(2). When a program is a TCP client the common sequence of [[syscall]]s are socket(2), connect(2). [[TCP]] and [[UDP]] sockets have [[ports]] to identify them. On a system one can use [[netstat]] to see this. In UNIX only [[root]] can bind to ports less than 1024 the rest is available for all users. This is shown here as an example:
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	Raw sockets are restricted to the superuser ([[root]]) only. When writing to raw sockets you can manipulate the [[IP]] header which you cannot do with simple [[TCP]] or [[UDP]] sockets ([[setsockopt]] are an exception but require superuser ([[root]]) permissions). The [[traceroute]] program uses raw sockets in a UNIX system. It is possible to read from raw sockets, ie. if you specified a specific protocol you can read any packets that arrive for that protocol. In [[BSD]] and if the protocol is [[ICMP]] the ICMP types echo request (8), timestamp request (13) and address mask request (17) are not passed from the [[kernel]] to the socket. Similarely [[TCP]] and [[UDP]] protocols are not passed to a raw socket, these must use stream or dgram sockets or be read from the [[OSI]] datalink layer (see [[bpf]]).		Raw sockets are restricted to the superuser ([[root]]) only. When writing to raw sockets you can manipulate the [[IP]] header which you cannot do with simple [[TCP]] or [[UDP]] sockets ([[setsockopt]] are an exception but require superuser ([[root]]) permissions). The [[traceroute]] program uses raw sockets in a UNIX system. It is possible to read from raw sockets, ie. if you specified a specific protocol you can read any packets that arrive for that protocol. In [[BSD]] and if the protocol is [[ICMP]] the ICMP types echo request (8), timestamp request (13) and address mask request (17) are not passed from the [[kernel]] to the socket. Similarely [[TCP]] and [[UDP]] protocols are not passed to a raw socket, these must use stream or dgram sockets or be read from the [[OSI]] datalink layer (see [[bpf]]).


	=== Divert sockets ===		=== Divert sockets ===

Hawson: Reverted edits by BfoKmu (Talk); changed back to last version by Franks

2007-06-18T19:28:05Z

Reverted edits by BfoKmu (Talk); changed back to last version by Franks

← Older revision		Revision as of 12:28, 18 June 2007
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[[http://climate.msrc.sunysb.edu/1984/messages/347.html free sony ringtones]] [[http://brown.cla.sc.edu/projects/pas/bforum/index.php?method=showhtmllist&list=message&rollid=2,26 order levitra]] [[http://mrsrl.stanford.edu/seminar/detailview.php?event_id=313 zanaflex online]] [[http://groups.ku.edu/cgi-bin/cgiwrap/kuksa/forum/ezboard.cgi?db=general&action=read&dbf=44 but phentermine]] [[http://ocw201-1.usc.edu/iPIDD/ju_board/view.php?message_ID=12 celexa online]] Sockets are an API for [[IPC]] or network communication with a [[process]]. For IPC Unix domain sockets are used, for network communication INET sockets are preferred. INET sockets work on [[OSI]] layer 3 and above. Lower layer access is provided by [[bpf]] the Berkeley packet filter. Sockets provide [[descriptors]] to a process with which data or control data can be exchanged with the kernel.		Sockets are an API for [[IPC]] or network communication with a [[process]]. For IPC Unix domain sockets are used, for network communication INET sockets are preferred. INET sockets work on [[OSI]] layer 3 and above. Lower layer access is provided by [[bpf]] the Berkeley packet filter. Sockets provide [[descriptors]] to a process with which data or control data can be exchanged with the kernel.

BfoKmu at 20:08, 15 June 2007

2007-06-15T20:08:57Z

← Older revision		Revision as of 13:08, 15 June 2007
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Franks: /* How do I see Internet traffic */

2005-12-14T00:51:23Z

How do I see Internet traffic

← Older revision		Revision as of 17:51, 13 December 2005
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	=== How do I see Internet traffic ===		=== How do I see Internet traffic ===

	[[~~tcpdump~~]] is a tool that allows one to see packets carried through the [[network interface]] of a ~~UNIX~~ computer.		A packet [[sniffer]] is a tool that allows one to see packets carried through the [[network interface]] of a host computer.