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2012-12-12 11:26:24

原文地址:Perl Socket 编程样例 作者:huaius

Perl Socket 编程样例(1)

Perl的networking 功能非常强大,基本上用c/c++能做的事perl都能做,而且做得更轻松方便,甚至可以只用10来行代码就完成了c/c++要几十上百甚至几百行才能完成得好的工作。

在networking方面,最基础的是BSD socket编程,但往往perl入门时在这个方面,最头疼的无疑是如何开始,如何Step by step。最好的药方就是Example,一段完整的可以运行(working)的代码,通过实践来感受远比看枯燥的manual来得深刻。

以下给出几段使用Socket及IO::Socket编写的Server/client,他们能实现最简单但是却最基本的任务,包括一个forking/accept的模型。可以直接复制这些代码,然后小加修改即可开发一些小型的tcp/udp应用了。

TCP 客户端, Socket 模块

简介:实现从服务器端读取一行信息然后返回


#!/usr/bin/perl -w
# tcp_socket_cli.pl
use strict;
use Socket;

my $addr = $ARGV[0] || '127.0.0.1';
my $port = $ARGV[1] || '3000';
my $dest = sockaddr_in($port, inet_aton($addr));
my $buf = undef;

socket(SOCK,PF_INET,SOCK_STREAM,6) or die "Can't create socket: $!";
connect(SOCK,$dest) or die "Can't connect: $!";

my $bs = sysread(SOCK, $buf, 2048); # try to read 2048
print "Received $bs bytes, content $buf\n"; # actually get $bs bytes
close SOCK;

执行结果:

perl tcp_socket_cli.pl localhost 25
Received 41 bytes, content 220 ESMTP Postfix - ExtMail 0.12-hzqbbc

TCP 服务端 Socket模块, forking/accept模型

简介:一个多进程的TCP 服务器,sample中实现了daytime的功能

#!/usr/bin/perl -w
# tcp_socket_dt_srv.pl
use strict;
use Socket;
use IO::Handle;
use POSIX qw(WNOHANG);

my $port = $ARGV[0] || '3000';
my $proto = getprotobyname('tcp');

$SIG{'CHLD'} = sub {
while((my $pid = waitpid(-1, WNOHANG)) >0) {
print "Reaped child $pid\n";
}
};

socket(SOCK, AF_INET, SOCK_STREAM, getprotobyname('tcp'))
or die "socket() failed: $!";
setsockopt(SOCK,SOL_SOCKET,SO_REUSEADDR,1)
or die "Can't set SO_REUSADDR: $!" ;

my $my_addr = sockaddr_in($port,INADDR_ANY);
bind(SOCK,$my_addr) or die "bind() failed: $!";
listen(SOCK,SOMAXCONN) or die "listen() failed: $!";

warn "Starting server on port $port...\n";

while (1) {
next unless my $remote_addr = accept(SESSION,SOCK);
defined(my $pid=fork) or die "Can't fork: $!\n";

if($pid==0) {
my ($port,$hisaddr) = sockaddr_in($remote_addr);
warn "Connection from [",inet_ntoa($hisaddr),",$port]\n";
SESSION->autoflush(1);
print SESSION (my $s = localtime);
warn "Connection from [",inet_ntoa($hisaddr),",$port] finished\n";
close SESSION;
exit 0;
}else {
print "Forking child $pid\n";
}
}

close SOCK;

利用上述tcp_socket_cli.pl访问该server的执行结果:

[hzqbbc@local misc]$ perl tcp_socket_dt_srv.pl 
Starting server on port 3000...
Connection from [127.0.0.1,32888]
Connection from [127.0.0.1,32888] finished
Reaped child 13927
Forking child 13927

TCP 客户端 ,IO::Sockiet模块

简介:同样为客户端,不过使用的是IO::Socket 面向对象模块

#!/usr/bin/perl -w
# tcp_iosocket_cli.pl
use strict;
use IO::Socket;

my $addr = $ARGV[0] || '127.0.0.1';
my $port = $ARGV[1] || '3000';
my $buf = undef;

my $sock = IO::Socket::INET->new(
PeerAddr => $addr,
PeerPort => $port,
Proto => 'tcp')
or die "Can't connect: $!\n";
$buf = <$sock>;
my $bs = length($buf);
print "Received $bs bytes, content $buf\n"; # actually get $bs bytes
close $sock;

TCP 服务端, IO::Socket模块, forking/accept模型

简介:同样的一个daytime 服务器,使用IO::Socket重写。

#!/usr/bin/perl
# tcp_iosocket_dt_srv.pl
use strict;
use IO::Socket;
use POSIX qw(WNOHANG);

$SIG = sub {
while((my $pid = waitpid(-1, WNOHANG)) >0) {
print "Reaped child $pid\n";
}
};

my $port = $ARGV[0] || '3000';
my $sock = IO::Socket::INET->new( Listen => 20,
LocalPort => $port,
Timeout => 60*1,
Reuse => 1)
or die "Can't create listening socket: $!\n";

warn "Starting server on port $port...\n";
while (1) {
next unless my $session = $sock->accept;
defined (my $pid = fork) or die "Can't fork: $!\n";

if($pid == 0) {
my $peer = gethostbyaddr($session->peeraddr,AF_INET) || $session->peerhost;
my $port = $session->peerport;
warn "Connection from [$peer,$port]\n";
$session->autoflush(1);
print $session (my $s = localtime), "\n";
warn "Connection from [$peer,$port] finished\n";
close $session;
exit 0;
}else {
print "Forking child $pid\n";
}
}
close $sock;

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