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Net::Inet(3pm) User Contributed Perl Documentation Net::Inet(3pm)
NAME
Net::Inet - Internet socket interface module
SYNOPSIS
use Net::Gen; # optional
use Net::Inet;
DESCRIPTION
The "Net::Inet" module provides basic services for handling socket-based communications
for the Internet protocol family. It inherits from "Net::Gen", and is a base for
"Net::TCP" and "Net::UDP".
Public Methods
new Usage:
$obj = new Net::Inet;
$obj = new Net::Inet $desthost, $destservice;
$obj = new Net::Inet \%parameters;
$obj = new Net::Inet $desthost, $destservice, \%parameters;
$obj = 'Net::Inet'->new();
$obj = 'Net::Inet'->new($desthost, $destservice);
$obj = 'Net::Inet'->new(\%parameters);
$obj = 'Net::Inet'->new($desthost, $destservice, \%parameters);
Returns a newly-initialised object of the given class. If called for a derived class,
no validation of the supplied parameters will be performed. (This is so that the
derived class can set up the parameter validation it needs in the object before
allowing the validation.) Otherwise, it will cause the parameters to be validated by
calling its "init" method. In particular, this means that if both a host and a
service are given, then an object will only be returned if a connect() call was
successful, or if the object is non-blocking and a connect() call is in progress.
The examples above show the indirect object syntax which many prefer, as well as the
guaranteed-to-be-safe static method call. There are occasional problems with the
indirect object syntax, which tend to be rather obscure when encountered. See
http://www.xray.mpe.mpg.de/mailing-lists/perl-porters/1998-01/msg01674.html for
details.
init
Usage:
return undef unless $self->init;
return undef unless $self->init(\%parameters);
return undef unless $self->init($desthost, $destservice);
return undef unless $self->init($desthost, $destservice, \%parameters);
Verifies that all previous parameter assignments are valid (via "checkparams").
Returns the incoming object on success, and "undef" on failure. Usually called only
via a derived class's "init" method or its own "new" call.
bind
Usage:
$ok = $obj->bind;
$ok = $obj->bind($lclhost, $lclservice);
$ok = $obj->bind($lclhost, $lclservice, \%parameters);
Sets up the "srcaddrlist" object parameter with the specified $lclhost and $lclservice
arguments if supplied (via the "thishost" and "thisport" object parameters), and then
returns the value from the inherited "bind" method. Changing of parameters is also
allowed, mainly for setting debug status or timeouts.
Example:
$ok = $obj->bind(0, 'echo(7)'); # attach to the local TCP echo port
unbind
Usage:
$obj->unbind;
Deletes the "thishost" and "thisport" object parameters, and then (assuming that
succeeds, which it should) returns the value from the inherited "unbind" method.
connect
Usage:
$ok = $obj->connect;
$ok = $obj->connect($host, $service);
$ok = $obj->connect($host, $service, \%parameters);
Attempts to establish a connection for the object. If the $host or $service arguments
are specified, they will be used to set the "desthost" and "destservice"/"destport"
object parameters, with side-effects of setting up the "dstaddrlist" object parameter.
Then, the result of a call to the inherited "connect" method will be returned.
Changing of parameters is also allowed, mainly for setting debug status or timeouts.
format_addr
Usage:
$string = $obj->format_addr($sockaddr);
$string = $obj->format_addr($sockaddr, $numeric_only);
$string = format_addr Module $sockaddr;
$string = format_addr Module $sockaddr, $numeric_only;
Returns a formatted representation of the address. This is a method so that it can be
overridden by derived classes. It is used to implement ``pretty-printing'' methods
for source and destination addresses. If the $numeric_only argument is true, the
address and port number will be used even if they can be resolved to names.
Otherwise, the resolved hostname and service name will be used if possible.
format_local_addr
Usage:
$string = $obj->format_local_addr;
$string = $obj->format_local_addr($numeric_only);
Returns a formatted representation of the local socket address associated with the
object. A sugar-coated way of calling the "format_addr" method for the "srcaddr"
object parameter.
format_remote_addr
Usage:
$string = $obj->format_remote_addr;
Returns a formatted representation of the remote socket address associated with the
object. A sugar-coated way of calling the "format_addr" method for the "dstaddr"
object parameter.
getsockinfo
An augmented form of "Net::Gen::getsockinfo". Aside from updating more object
parameters, it behaves the same as that in the base class. The additional object
parameters which get set are "lcladdr", "lclhost", "lclport", "lclservice", "remaddr",
"remhost", "remport", and "remservice". (They are described in "Known Object
Parameters" below.)
There are also various accessor methods for the object parameters. See "Public Methods"
in Net::Gen (where it talks about "Accessors") for calling details. See "Known Object
Parameters" below for those defined by this class.
Protected Methods
[See the note in "Protected Methods" in Net::Gen about my definition of protected methods
in Perl.]
None.
Known Socket Options
These are the socket options known to the "Net::Inet" module itself:
"IP_HDRINCL" "IP_RECVDSTADDR" "IP_RECVOPTS" "IP_RECVRETOPTS" "IP_TOS" "IP_TTL"
"IP_ADD_MEMBERSHIP" "IP_DROP_MEMBERSHIP" "IP_MULTICAST_IF" "IP_MULTICAST_LOOP"
"IP_MULTICAST_TTL" "IP_OPTIONS" "IP_RETOPTS"
Known Object Parameters
These are the object parameters registered by the "Net::Inet" module itself:
IPproto
The name of the Internet protocol in use on the socket associated with the object.
Set as a side-effect of setting the "proto" object parameter, and vice versa.
proto
Used the same way as with "Net::Gen", but has a handler attached to keep it in sync
with "IPproto".
thishost
The source host name or address to use for the "bind" method. When used in
conjunction with the "thisservice" or "thisport" object parameter, causes the
"srcaddrlist" object parameter to be set, which is how it affects the bind() action.
This parameter is validated, and must be either a valid internet address or a hostname
for which an address can be found. If a hostname is given, and multiple addresses are
found for it, then each address will be entered into the "srcaddrlist" array
reference.
desthost
The destination host name or address to use for the "connect" method. When used in
conjunction with the "destservice" or "destport" object parameter, causes the
"dstaddrlist" object parameter to be set, which is how it affects the connect()
action. This parameter is validated, and must be either a valid internet address or a
hostname for which an address can be found. If a hostname is given, and multiple
addresses are found for it, then each address will be entered into the "dstaddrlist"
array reference, in order. This allows the "connect" method to attempt a connection
to each address, as per RFC 1123.
thisservice
The source service name (or number) to use for the "bind" method. An attempt will be
made to translate the supplied service name with getservbyname(). If that succeeds,
or if it fails but the supplied value was strictly numeric, the port number will be
set in the "thisport" object parameter. If the supplied value is not numeric and
can't be translated, the attempt to set the value will fail. Otherwise, this causes
the "srcaddrlist" object parameter to be updated, in preparation for an invocation of
the "bind" method (possibly implicitly from the "connect" method).
thisport
The source service number (or name) to use for the "bind" method. An attempt will be
made to translate the supplied service name with getservbyname() if it is not strictly
numeric. If that succeeds, the given name will be set in the "thisservice" parameter,
and the resolved port number will be set in the "thisport" object parameter. If the
supplied value is strictly numeric, and a call to getservbyport can resolve a name for
the service, the "thisservice" parameter will be updated appropriately. If the
supplied value is not numeric and can't be translated, the attempt to set the value
will fail. Otherwise, this causes the "srcaddrlist" object parameter to be updated,
in preparation for an invocation of the "bind" method (possibly implicitly from the
"connect" method).
destservice
The destination service name (or number) to use for the "connect" method. An attempt
will be made to translate the supplied service name with getservbyname(). If that
succeeds, or if it fails but the supplied value was strictly numeric, the port number
will be set in the "destport" object parameter. If the supplied value is not numeric
and can't be translated, the attempt to set the value will fail. Otherwise, if the
"desthost" parameter has a defined value, this causes the "dstaddrlist" object
parameter to be updated, in preparation for an invocation of the "connect" method.
destport
The destination service number (or name) to use for the "connect" method. An attempt
will be made to translate the supplied service name with getservbyname() if it is not
strictly numeric. If that succeeds, the given name will be set in the "destservice"
parameter, and the resolved port number will be set in the "destport" parameter. If
the supplied value is strictly numeric, and a call to getservbyport can resolve a name
for the service, the "destservice" parameter will be updated appropriately. If the
supplied value is not numeric and can't be translated, the attempt to set the value
will fail. Otherwise, if the "desthost" parameter has a defined value, this causes
the "dstaddrlist" object parameter to be updated, in preparation for an invocation of
the "connect" method.
lcladdr
The local IP address stashed by the "getsockinfo" method after a successful bind() or
connect() call.
lclhost
The local hostname stashed by the "getsockinfo" method after a successful bind() or
connect(), as resolved from the "lcladdr" object parameter.
lclport
The local port number stashed by the "getsockinfo" method after a successful bind() or
connect() call.
lclservice
The local service name stashed by the "getsockinfo" method after a successful bind()
or connect(), as resolved from the "lclport" object parameter.
remaddr
The remote IP address stashed by the "getsockinfo" method after a successful connect()
call.
remhost
The remote hostname stashed by the "getsockinfo" method after a successful connect()
call, as resolved from the "remaddr" object parameter.
remport
The remote port number stashed by the "getsockinfo" method after a successful
connect() call.
remservice
The remote service name stashed by the "getsockinfo" method after a successful
connect() call, as resolved from the "remport" object parameter.
Non-Method Subroutines
inet_aton
Usage:
$in_addr = inet_aton('192.0.2.1');
Returns the packed "AF_INET" address in network order, if it is validly formed, or
"undef" on error. This used to be a separate implementation in this package, but is
now inherited from the "Socket" module.
inet_addr
A synonym for inet_aton() (for old fogeys like me who forget about the new name).
(Yes, I know it's different in C, but in Perl there's no need to propagate the old
inet_addr() braindamage of being unable to handle "255.255.255.255", so I didn't.)
inet_ntoa
Usage:
$addr_string = inet_ntoa($in_addr);
Returns the ASCII representation of the "AF_INET" address provided (if possible), or
"undef" on error. This used to be a separate implementation in this package, but is
now inherited from the "Socket" module.
htonl
htons
ntohl
ntohs
About as those who are used to them might expect, I think. However, these versions
will return lists in list context, and will complain if given a multi-element list in
scalar context.
[For those who don't know what these are, and who don't have documentation on them in
their existing system documentation, these functions convert data between 'host' and
'network' byte ordering, for 'short' or 'long' network data. (This should explain the
'h', 'n', 's', and 'l' letters in the names.) Long network data means 32-bit
quantities, such as IP addresses, and short network data means 16-bit quantities, such
as IP port numbers. You'd only need to use these functions if you're not using the
methods from this package to build your packed 'sockaddr' structures or to unpack
their data after a connect() or accept().]
pack_sockaddr_in
Usage:
$connect_address = pack_sockaddr_in($family, $port, $in_addr);
$connect_address = pack_sockaddr_in($port, $in_addr);
Returns the packed "struct sockaddr_in" corresponding to the provided $family, $port,
and $in_addr arguments. The $family and $port arguments must be numbers, and the
$in_addr argument must be a packed "struct in_addr" such as the trailing elements from
perl's gethostent() return list. This differs from the implementation in the "Socket"
module in that the $family argument is available (though optional). The $family
argument defaults to "AF_INET".
unpack_sockaddr_in
Usage:
($family, $port, $in_addr) = unpack_sockaddr_in($connected_address);
Returns the address family, port, and packed "struct in_addr" from the supplied packed
"struct sockaddr_in". This is the inverse of pack_sockaddr_in(). This differs from
the implementation in the "Socket" module in that the $family value from the socket
address is returned (and might not be "AF_INET").
INADDR_UNSPEC_GROUP
INADDR_ALLHOSTS_GROUP
INADDR_ALLRTRS_GROUP
INADDR_MAX_LOCAL_GROUP
Constant routines returning the unspecified local, all hosts, all routers, or the
maximum possible local IP multicast group address, respectively. These routines
return results in the form of a packed "struct inaddr" much like the "INADDR_ANY"
result described in "INADDR_ANY" in Socket.
IN_CLASSA
IN_CLASSB
IN_CLASSC
IN_CLASSD
IN_MULTICAST
IN_EXPERIMENTAL
IN_BADCLASS
Usage:
$boolean = IN_EXPERIMENTAL(INADDR_ALLHOSTS_GROUP);
$boolean = IN_CLASSA(0x7f000001);
These routines return the network class information for the supplied IP address. Of
these, only IN_BADCLASS() and IN_MULTICAST() are really useful in today's Internet,
since the advent of CIDR (classless Internet domain routing). In particular,
IN_EXPERIMENTAL() is at the mercy of your vendor's definition. The first example
above will be true only on older systems, which almost certainly don't support IP
multicast anyway. The argument to any of these functions can be either a packed
"struct inaddr" such as that returned by inet_ntoa() or unpack_sockaddr_in(), or an
integer (or integer expression) giving an IP address in host byte order.
IPOPT_CLASS
IPOPT_COPIED
IPOPT_NUMBER
Usage:
$optnum = IPOPT_NUMBER($option);
These routines extract information from IP option numbers, as per the information on
IP options in RFC 791.
... Other constants which relate to parts of IP or ICMP headers or vendor-defined socket
options, as listed in "Exports" below.
Exports
default
"INADDR_ALLHOSTS_GROUP" "INADDR_ALLRTRS_GROUP" "INADDR_ANY" "INADDR_BROADCAST"
"INADDR_LOOPBACK" "INADDR_MAX_LOCAL_GROUP" "INADDR_NONE" "INADDR_UNSPEC_GROUP"
"IPPORT_RESERVED" "IPPORT_USERRESERVED" "IPPORT_DYNAMIC" "IPPROTO_EGP" "IPPROTO_EON"
"IPPROTO_GGP" "IPPROTO_HELLO" "IPPROTO_ICMP" "IPPROTO_IDP" "IPPROTO_IGMP" "IPPROTO_IP"
"IPPROTO_IPIP" "IPPROTO_MAX" "IPPROTO_PUP" "IPPROTO_RAW" "IPPROTO_RSVP" "IPPROTO_TCP"
"IPPROTO_TP" "IPPROTO_UDP" "htonl" "htons" "inet_addr" "inet_aton" "inet_ntoa" "ntohl"
"ntohs"
exportable
"DEFTTL" "ICMP_ADVLENMIN" "ICMP_ECHO" "ICMP_ECHOREPLY" "ICMP_INFOTYPE" "ICMP_IREQ"
"ICMP_IREQREPLY" "ICMP_MASKLEN" "ICMP_MASKREPLY" "ICMP_MASKREQ" "ICMP_MAXTYPE"
"ICMP_MINLEN" "ICMP_PARAMPROB" "ICMP_REDIRECT" "ICMP_REDIRECT_HOST"
"ICMP_REDIRECT_NET" "ICMP_REDIRECT_TOSHOST" "ICMP_REDIRECT_TOSNET" "ICMP_SOURCEQUENCH"
"ICMP_TIMXCEED" "ICMP_TIMXCEED_INTRANS" "ICMP_TIMXCEED_REASS" "ICMP_TSLEN"
"ICMP_TSTAMP" "ICMP_TSTAMPREPLY" "ICMP_UNREACH" "ICMP_UNREACH_HOST"
"ICMP_UNREACH_NEEDFRAG" "ICMP_UNREACH_NET" "ICMP_UNREACH_PORT" "ICMP_UNREACH_PROTOCOL"
"ICMP_UNREACH_SRCFAIL" "IN_BADCLASS" "IN_CLASSA" "IN_CLASSA_HOST" "IN_CLASSA_MAX"
"IN_CLASSA_NET" "IN_CLASSA_NSHIFT" "IN_CLASSA_SUBHOST" "IN_CLASSA_SUBNET"
"IN_CLASSA_SUBNSHIFT" "IN_CLASSB" "IN_CLASSB_HOST" "IN_CLASSB_MAX" "IN_CLASSB_NET"
"IN_CLASSB_NSHIFT" "IN_CLASSB_SUBHOST" "IN_CLASSB_SUBNET" "IN_CLASSB_SUBNSHIFT"
"IN_CLASSC" "IN_CLASSC_HOST" "IN_CLASSC_MAX" "IN_CLASSC_NET" "IN_CLASSC_NSHIFT"
"IN_CLASSD" "IN_CLASSD_HOST" "IN_CLASSD_NET" "IN_CLASSD_NSHIFT" "IN_EXPERIMENTAL"
"IN_LOOPBACKNET" "IN_MULTICAST" "IPFRAGTTL" "IPOPT_CIPSO" "IPOPT_CLASS"
"IPOPT_CONTROL" "IPOPT_COPIED" "IPOPT_DEBMEAS" "IPOPT_EOL" "IPOPT_LSRR" "IPOPT_MINOFF"
"IPOPT_NOP" "IPOPT_NUMBER" "IPOPT_OFFSET" "IPOPT_OLEN" "IPOPT_OPTVAL"
"IPOPT_RESERVED1" "IPOPT_RESERVED2" "IPOPT_RIPSO_AUX" "IPOPT_RR" "IPOPT_SATID"
"IPOPT_SECURITY" "IPOPT_SECUR_CONFID" "IPOPT_SECUR_EFTO" "IPOPT_SECUR_MMMM"
"IPOPT_SECUR_RESTR" "IPOPT_SECUR_SECRET" "IPOPT_SECUR_TOPSECRET" "IPOPT_SECUR_UNCLASS"
"IPOPT_SSRR" "IPOPT_TS" "IPOPT_TS_PRESPEC" "IPOPT_TS_TSANDADDR" "IPOPT_TS_TSONLY"
"IPPORT_TIMESERVER" "IPTOS_LOWDELAY" "IPTOS_PREC_CRITIC_ECP" "IPTOS_PREC_FLASH"
"IPTOS_PREC_FLASHOVERRIDE" "IPTOS_PREC_IMMEDIATE" "IPTOS_PREC_INTERNETCONTROL"
"IPTOS_PREC_NETCONTROL" "IPTOS_PREC_PRIORITY" "IPTOS_PREC_ROUTINE" "IPTOS_RELIABILITY"
"IPTOS_THROUGHPUT" "IPTTLDEC" "IPVERSION" "IP_ADD_MEMBERSHIP"
"IP_DEFAULT_MULTICAST_LOOP" "IP_DEFAULT_MULTICAST_TTL" "IP_DF" "IP_DROP_MEMBERSHIP"
"IP_HDRINCL" "IP_MAXPACKET" "IP_MAX_MEMBERSHIPS" "IP_MF" "IP_MSS" "IP_MULTICAST_IF"
"IP_MULTICAST_LOOP" "IP_MULTICAST_TTL" "IP_OPTIONS" "IP_RECVDSTADDR" "IP_RECVOPTS"
"IP_RECVRETOPTS" "IP_RETOPTS" "IP_TOS" "IP_TTL" "MAXTTL" "MAX_IPOPTLEN" "MINTTL"
"SUBNETSHIFT" "pack_sockaddr_in" "unpack_sockaddr_in"
tags
The following :tags are in %EXPORT_TAGS, with the associated exportable values as
listed:
:sockopts
"IP_HDRINCL" "IP_RECVDSTADDR" "IP_RECVOPTS" "IP_RECVRETOPTS" "IP_TOS" "IP_TTL"
"IP_ADD_MEMBERSHIP" "IP_DROP_MEMBERSHIP" "IP_MULTICAST_IF" "IP_MULTICAST_LOOP"
"IP_MULTICAST_TTL" "IP_OPTIONS" "IP_RETOPTS"
:routines
"pack_sockaddr_in" "unpack_sockaddr_in" "inet_ntoa" "inet_aton" "inet_addr"
"htonl" "ntohl" "htons" "ntohs" "ICMP_INFOTYPE" "IN_BADCLASS" "IN_EXPERIMENTAL"
"IN_MULTICAST" "IPOPT_CLASS" "IPOPT_COPIED" "IPOPT_NUMBER"
:icmpvalues
"ICMP_ADVLENMIN" "ICMP_ECHO" "ICMP_ECHOREPLY" "ICMP_IREQ" "ICMP_IREQREPLY"
"ICMP_MASKLEN" "ICMP_MASKREPLY" "ICMP_MASKREQ" "ICMP_MAXTYPE" "ICMP_MINLEN"
"ICMP_PARAMPROB" "ICMP_REDIRECT" "ICMP_REDIRECT_HOST" "ICMP_REDIRECT_NET"
"ICMP_REDIRECT_TOSHOST" "ICMP_REDIRECT_TOSNET" "ICMP_SOURCEQUENCH"
"ICMP_TIMXCEED" "ICMP_TIMXCEED_INTRANS" "ICMP_TIMXCEED_REASS" "ICMP_TSLEN"
"ICMP_TSTAMP" "ICMP_TSTAMPREPLY" "ICMP_UNREACH" "ICMP_UNREACH_HOST"
"ICMP_UNREACH_NEEDFRAG" "ICMP_UNREACH_NET" "ICMP_UNREACH_PORT"
"ICMP_UNREACH_PROTOCOL" "ICMP_UNREACH_SRCFAIL"
:ipoptions
"IPOPT_CIPSO" "IPOPT_CONTROL" "IPOPT_DEBMEAS" "IPOPT_EOL" "IPOPT_LSRR"
"IPOPT_MINOFF" "IPOPT_NOP" "IPOPT_OFFSET" "IPOPT_OLEN" "IPOPT_OPTVAL"
"IPOPT_RESERVED1" "IPOPT_RESERVED2" "IPOPT_RIPSO_AUX" "IPOPT_RR" "IPOPT_SATID"
"IPOPT_SECURITY" "IPOPT_SECUR_CONFID" "IPOPT_SECUR_EFTO" "IPOPT_SECUR_MMMM"
"IPOPT_SECUR_RESTR" "IPOPT_SECUR_SECRET" "IPOPT_SECUR_TOPSECRET"
"IPOPT_SECUR_UNCLASS" "IPOPT_SSRR" "IPOPT_TS" "IPOPT_TS_PRESPEC"
"IPOPT_TS_TSANDADDR" "IPOPT_TS_TSONLY" "MAX_IPOPTLEN"
:iptosvalues
"IPTOS_LOWDELAY" "IPTOS_PREC_CRITIC_ECP" "IPTOS_PREC_FLASH"
"IPTOS_PREC_FLASHOVERRIDE" "IPTOS_PREC_IMMEDIATE" "IPTOS_PREC_INTERNETCONTROL"
"IPTOS_PREC_NETCONTROL" "IPTOS_PREC_PRIORITY" "IPTOS_PREC_ROUTINE"
"IPTOS_RELIABILITY" "IPTOS_THROUGHPUT"
:protocolvalues
"DEFTTL" "INADDR_ALLHOSTS_GROUP" "INADDR_ALLRTRS_GROUP" "INADDR_ANY"
"INADDR_BROADCAST" "INADDR_LOOPBACK" "INADDR_MAX_LOCAL_GROUP" "INADDR_NONE"
"INADDR_UNSPEC_GROUP" "IN_LOOPBACKNET" "IPPORT_RESERVED" "IPPORT_USERRESERVED"
"IPPORT_DYNAMIC" "IPPROTO_EGP" "IPPROTO_EON" "IPPROTO_GGP" "IPPROTO_HELLO"
"IPPROTO_ICMP" "IPPROTO_IDP" "IPPROTO_IGMP" "IPPROTO_IP" "IPPROTO_IPIP"
"IPPROTO_MAX" "IPPROTO_PUP" "IPPROTO_RAW" "IPPROTO_RSVP" "IPPROTO_TCP"
"IPPROTO_TP" "IPPROTO_UDP" "IPFRAGTTL" "IPTTLDEC" "IPVERSION" "IP_DF"
"IP_MAXPACKET" "IP_MF" "IP_MSS" "MAXTTL" "MAX_IPOPTLEN" "MINTTL"
:ipmulticast
"IP_ADD_MEMBERSHIP" "IP_DEFAULT_MULTICAST_LOOP" "IP_DEFAULT_MULTICAST_TTL"
"IP_DROP_MEMBERSHIP" "IP_MAX_MEMBERSHIPS" "IP_MULTICAST_IF" "IP_MULTICAST_LOOP"
"IP_MULTICAST_TTL"
:deprecated
"IN_CLASSA_HOST" "IN_CLASSA_MAX" "IN_CLASSA_NET" "IN_CLASSA_NSHIFT"
"IN_CLASSA_SUBHOST" "IN_CLASSA_SUBNET" "IN_CLASSA_SUBNSHIFT" "IN_CLASSB_HOST"
"IN_CLASSB_MAX" "IN_CLASSB_NET" "IN_CLASSB_NSHIFT" "IN_CLASSB_SUBHOST"
"IN_CLASSB_SUBNET" "IN_CLASSB_SUBNSHIFT" "IN_CLASSC_HOST" "IN_CLASSC_MAX"
"IN_CLASSC_NET" "IN_CLASSC_NSHIFT" "IN_CLASSD_HOST" "IN_CLASSD_NET"
"IN_CLASSD_NSHIFT" "IN_CLASSA" "IN_CLASSB" "IN_CLASSC" "IN_CLASSD"
"IPPORT_TIMESERVER" "SUBNETSHIFT"
:ALL All of the above exportable items.
NOTES
Anywhere a service or port argument is used above, the allowed syntax is either a service
name, a port number, or a service name with a caller-supplied default port number.
Examples are 'echo', 7, and 'echo(7)', respectively. For a service argument, a bare port
number must be translatable into a service name with getservbyport() or an error will
result. A service name must be translatable into a port with getservbyname() or an error
will result. However, a service name with a default port number will succeed (by using
the supplied default) even if the translation with getservbyname() fails.
For example:
$obj->setparam('destservice', 'http(80)');
This always succeeds, although if your /etc/services file (or equivalent for non-UNIX
systems) maps "http" to something other than port 80, you'll get that other port.
For a contrasting example:
$obj->setparam('destservice', 80);
This will fail, despite the numeric value, if your /etc/services file (or equivalent) is
behind the times and has no mapping to a service name for port 80.
THREADING STATUS
This module has been tested with threaded perls, and should be as thread-safe as perl
itself. (As of 5.005_03 and 5.005_57, that's not all that safe just yet.) It also works
with interpreter-based threads ('ithreads') in more recent perl releases.
SEE ALSO
Net::Gen(3), Net::TCP(3), Net::UDP(3)
AUTHOR
Spider Boardman <spidb AT cpan.org>
perl v5.10.0 2009-03-05 Net::Inet(3pm)
Generated by $Id: phpMan.php,v 4.49 2006/02/26 13:18:18 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
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