SERVICES(5)						     Linux Programmer's Manual						       SERVICES(5)

NAME

       services - Internet network services list

DESCRIPTION

       services is a plain ASCII file providing a mapping between friendly textual names for internet services, and their underlying assigned port
       numbers and protocol types. Every networking program should look into this file to get the port number (and protocol) for its service.  The
       C library routines getservent(3), getservbyname(3), getservbyport(3), setservent(3), and endservent(3) support querying this file from pro-
       grams.

       Port numbers are assigned by the IANA (Internet Assigned Numbers Authority), and their current policy is to assign both TCP and UDP  proto-
       cols when assigning a port number. Therefore, most entries will have two entries, even for TCP only services.

       Port  numbers  below  1024  (so-called  'low  numbered'	ports) can only be bound to by root (see bind(2), tcp(7), and udp(7)).	This is so
       clients connecting to low numbered ports can trust that the service running on the port is the standard implementation,	and  not  a  rogue
       service run by a user of the machine.  Well-known port numbers specified by the IANA are normally located in this root-only space.

       The presence of an entry for a service in the services file does not necessarily mean that the service is currently running on the machine.
       See inetd.conf(5) for the configuration of Internet services offered. Note that not all networking services are started by inetd(8), and so
       won't appear in inetd.conf(5).  In particular, news (NNTP) and mail (SMTP) servers are often initialized from the system boot scripts.

       The location of the services file is defined by _PATH_SERVICES in /usr/include/netdb.h.	This is usually set to /etc/services.

       Each line describes one service, and is of the form:

	      service-name   port/protocol   [aliases ...]

       where:

       service-name
		 is  the friendly name the service is known by and looked up under. It is case sensitive. Often, the client program is named after
		 the service-name.

       port	 is the port number (in decimal) to use for this service.

       protocol  is the type of protocol to be used. This field should match an entry in the protocols(5) file. Typical  values  include  tcp  and
		 udp.

       aliases	 is an optional space or tab separated list of other names for this service (but see the BUGS section below). Again, the names are
		 case sensitive.

       Either spaces or tabs may be used to separate the fields.

       Comments are started by the hash sign (#) and continue until the end of the line. Blank lines are skipped.

       The service-name should begin in the first column of the file, since leading spaces are not stripped.  service-names can be  any  printable
       characters  excluding  space  and  tab. However, a conservative choice of characters should be used to minimize inter-operability problems.
       E.g., a-z, 0-9, and hyphen (-) would seem a sensible choice.

       Lines not matching this format should not be present in the file. (Currently, they are silently skipped by getservent(3), getservbyname(3),
       and getservbyport(3).  However, this behaviour should not be relied on.)

       As a backwards compatibility feature, the slash (/) between the port number and protocol name can in fact be either a slash or a comma (,).
       Use of the comma in modern installations is depreciated.

       This file might be distributed over a network using a network-wide naming service like Yellow Pages/NIS or BIND/Hesiod.

       A sample services file might look like this:

	      netstat	      15/tcp
	      qotd	      17/tcp	      quote
	      msp	      18/tcp	      # message send protocol
	      msp	      18/udp	      # message send protocol
	      chargen	      19/tcp	      ttytst source
	      chargen	      19/udp	      ttytst source
	      ftp	      21/tcp
	      # 22 - unassigned
	      telnet	      23/tcp

BUGS

       There is a maximum of 35 aliases, due to the way the getservent(3) code is written.

       Lines longer than BUFSIZ (currently 1024) characters will be ignored by getservent(3), getservbyname(3),  and  getservbyport(3).   However,
       this will also cause the next line to be mis-parsed.

FILES

       /etc/services
	      The Internet network services list

       /usr/include/netdb.h
	      Definition of _PATH_SERVICES

SEE ALSO

       getservent(3), getservbyname(3), getservbyport(3), setservent(3), endservent(3), protocols(5), listen(2), inetd.conf(5), inetd(8)

       Assigned Numbers RFC, most recently RFC 1700, (AKA STD0002)

       Guide to Yellow Pages Service

       Guide to BIND/Hesiod Service

Linux								    1996-01-11							       SERVICES(5)