Beginning Web Development With Perl : From Novice to ... - Nabo

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CHAPTER 5 ■ LWP MODULES 105Obviously, the same rules that apply to other Perl programming apply when you’re usingthe LWP. Don’t run as root unless absolutely necessary, be mindful of what you’re doing so youdon’t overwrite files, and so on.If you’re allowing uploads through web forms, pay special attention to where those filesare uploaded to and what the user can do with those files once uploaded. Numerous attackshave begun through a file-upload interface.SummaryThis chapter looked at some forms of interaction between a Perl program and the Internetusing the LWP modules. You saw how to set up a Perl-based browser, along with attributessuch as the user agent. You retrieved web pages and also learned about the GET and POSTmethods.More Internet interaction through Perl is on the way in the next chapter. Where this chapterfocused primarily on the LWP and web interaction, the next chapter will expand into otherprotocols, such as POP3, SMTP, and others.
CHAPTER 6■ ■ ■Net:: ToolsThe things that a programmer can do with Perl never cease to amaze me. The area of networkprogramming is no exception. Of course, it’s quite possible to get down and dirty with Perl andwrite your own network servers and clients. I find this to be rather enjoyable, which should tellyou something about me. However, sometimes I value simply getting the work done, ratherthan the process of writing low-level client/server code. Truthfully, that’s most of the time.There’s no need to reinvent the wheel when it comes to working with Simple Mail TransferProtocol (SMTP), Domain Name System (DNS), Post Office Protocol version 3 (POP3), InternetControl Message Protocol (ICMP), Lightweight Directory Access Protocol (LDAP), andother networking protocols.This chapter takes a look at some of the tools available to the Perl programmer for workingwith various Internet protocols (aside from HTTP): POP3 and SMTP for working with e-mail,DNS, and ICMP for ping. These are just a few of the numerous Net:: modules available. Forexample, other Net:: modules allow you to query an LDAP directory (and interoperate withMicrosoft’s Active Directory), query the whois database of domain names, work with FTP, andmore. The libnet tools on CPAN (http://search.cpan.org/~/libnet-1.19/) provide a listing ofsome of these tools.Checking E-Mail with Net::POP3POP3 (defined by RFC 1939) is a popular protocol used to check e-mail. It’s used to retrieve e-mailfrom a server, typically at an Internet provider, where the e-mail is stored or spooled. When youcheck your e-mail, a username and password are sent to the server, and the server sends backa list of messages and, optionally, the e-mail content itself. POP3 is not a protocol to send e-mail;that’s SMTP. POP3 is used only to retrieve e-mail that’s being stored on a POP3 server.The Net::POP3 module is the primary module used to check e-mail with the POP3 protocol.However, in the tradition of Perl, there are several packages available that can work withe-mail. One such package is Mail::Box, which I’ll cover after the discussion of Net::POP3.The Net::POP3 module is available with many Linux distributions and also from yourfavorite CPAN mirror. As with other modules, a use statement is the best way to import theNet::POP3 namespace into your Perl program:use Net::POP3;107
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Beginning Web Development with Perl
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PART 5 ■ ■ ■ Creating Web Tem
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■CONTENTSvii■CHAPTER 4 System I
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■CONTENTSixCreating a SOAP Listen
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■CONTENTSxiTemplate Toolkit Synta
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About the Author■STEVE SUEHRING i
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AcknowledgmentsThanks to James Lee
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xx■INTRODUCTIONThis book will use
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CHAPTER 1■ ■ ■The CGI ModuleT
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CHAPTER 1 ■ THE CGI MODULE 5for t
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CHAPTER 1 ■ THE CGI MODULE 7Obvio
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CHAPTER 1 ■ THE CGI MODULE 9exit;
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CHAPTER 1 ■ THE CGI MODULE 11Each
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CHAPTER 1 ■ THE CGI MODULE 15Upda
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CHAPTER 1 ■ THE CGI MODULE 19prin
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CHAPTER 1 ■ THE CGI MODULE 21Sett
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CHAPTER 1 ■ THE CGI MODULE 23You
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CHAPTER 1 ■ THE CGI MODULE 27No m
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CHAPTER 1 ■ THE CGI MODULE 29The
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CHAPTER 1 ■ THE CGI MODULE 31prin
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CHAPTER 1 ■ THE CGI MODULE 33Also
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CHAPTER 2■ ■ ■Popular CGI Mod
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CHAPTER 2 ■ POPULAR CGI MODULES 3
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50CHAPTER 3 ■ DATABASES AND PERLT
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52CHAPTER 3 ■ DATABASES AND PERLm
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Page 104 and 105: CHAPTER 5■ ■ ■LWP ModulesLWP
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Page 122 and 123: 108CHAPTER 6 ■ NET:: TOOLSCreatin
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Page 126 and 127: 112CHAPTER 6 ■ NET:: TOOLSmy $pop
Page 128 and 129: 114CHAPTER 6 ■ NET:: TOOLSthe POP
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Page 148 and 149: PART 3■ ■ ■XML and RSS
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158CHAPTER 8 ■ PERL AND RSSDebugg
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160CHAPTER 8 ■ PERL AND RSS$rsswr
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162CHAPTER 8 ■ PERL AND RSSListin
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CHAPTER 9■ ■ ■XML Parsing wit
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CHAPTER 9 ■ XML PARSING WITH PERL
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PART 4■ ■ ■PerformanceEnhance
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184CHAPTER 10 ■ APACHE AND MOD_PE
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202CHAPTER 11 ■ DEVELOPMENT WITH
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CHAPTER 12■ ■ ■The Template T
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CHAPTER 12 ■ THE TEMPLATE TOOLKIT
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CHAPTER 13■ ■ ■Perl Web Sites
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CHAPTER 13 ■ PERL WEB SITES WITH
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284APPENDIX ■ PERL BASICSKeywords
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286APPENDIX ■ PERL BASICS$ perl n
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288APPENDIX ■ PERL BASICSAnd line
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290APPENDIX ■ PERL BASICSCan you
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292APPENDIX ■ PERL BASICSBy defau
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294APPENDIX ■ PERL BASICS#!/usr/b
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296APPENDIX ■ PERL BASICSThe last
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298APPENDIX ■ PERL BASICSThe NOT
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300APPENDIX ■ PERL BASICSprint "S
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304APPENDIX ■ PERL BASICS$ perl s
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306APPENDIX ■ PERL BASICSThis cod
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308APPENDIX ■ PERL BASICS$a = 6 *
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310APPENDIX ■ PERL BASICS$a = "A9
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312APPENDIX ■ PERL BASICS#!/usr/b
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314APPENDIX ■ PERL BASICSmy $name
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316APPENDIX ■ PERL BASICSis short
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318APPENDIX ■ PERL BASICSLet’s
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320APPENDIX ■ PERL BASICSOther Te
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322APPENDIX ■ PERL BASICS}}}actio
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324APPENDIX ■ PERL BASICSNotice t
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326APPENDIX ■ PERL BASICSLooping
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328APPENDIX ■ PERL BASICSuse stri
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330APPENDIX ■ PERL BASICSuntil ($
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332APPENDIX ■ PERL BASICSuse stri
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334APPENDIX ■ PERL BASICSdoneAll
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336APPENDIX ■ PERL BASICS$ perl r
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338APPENDIX ■ PERL BASICSSummaryT
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340■INDEXmethods for retrieving r
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342■INDEXdo() method for, 62dumpi
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344■INDEXhello option for Net::SM
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346■INDEXNet::DNS module, 125-128
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348■INDEXrecord with Net::DNS mod
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350■INDEXstoring mail server in e
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352■INDEXlogging based on, 229pri
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