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In this example you ve performed a DNS request in a more detailed way using Resolv::DNS directly, rather than the convenient Resolv.getname and Resolv.getaddress helpers, so that you could specify the MX request using the Resolv::DNS::Resource::IN::MX option.
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CHAPTER 15 NETWORKING, SOCKETS, AND DAEMONS
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Note Readers who are savvy with DNS terminology might like to try using CNAME, A, SOA, PTR, NS, and
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TXT variations of the preceding option, as these are all supported.
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MX records are useful if you want to send e-mail to people but you have no SMTP server you can send mail through, as you can use Net::SMTP (as shown in 14) directly against the mail servers for the domain name of the e-mail address you want to send to. For example, if you wanted to e-mail someone whose e-mail address ended with @google.com, you could use Net::SMTP to connect directly to smtp2.google.com (or any of the other choices) and send the mail directly to that user:
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require 'resolv' require 'net/smtp' from = "your-email@example.com" to = "another-email@example.com" message = <<MESSAGE_END From: #{from} To: #{to} Subject: Direct e-mail test This is a test e-mail message. MESSAGE_END to_domain = to.match(/\@(.+)/)[1] Resolv::DNS.open do |dns| mail_servers = dns.getresources(to_domain, Resolv::DNS::Resource::IN::MX) mail_server = mail_servers[rand(mail_servers.size)].exchange.to_s Net::SMTP.start(mail_server) do |smtp| smtp.send_message message, from, to end end
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Note You can learn more about DNS at http://en.wikipedia.org/wiki/Domain_Name_System.
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Connecting to a TCP Server Directly
One of the most important networking operations is connecting to a service offered by another machine (or in some cases, even your local machine!) and interacting with it in some way. In 14 we looked at some high-level ways to do this, such as using the Web or FTP through Ruby libraries that made the operation of these tools easier. However, it s possible to connect directly to remote services at the TCP level and talk to them in their raw format. This can be useful to investigate how different protocols work (as you ll need to use and understand the protocol s raw data) or to create simple protocols of your own. To connect to a TCP port directly you can use a tool called Telnet. Telnet is a protocol to provide a general, bi-directional, 8-bit, byte-oriented communications facility. Its name comes from telecommunication network . You re only concerned with its ability to let you easily connect to raw TCP ports. As you d expect, Ruby comes with a Telnet library in the standard library, net/telnet. Let s use net/telnet to connect to a Web site and retrieve a Web page using the HTTP protocol directly:
require 'net/telnet' server = Net::Telnet::new('Host' => 'www.rubyinside.com', 'Port' => 80, 'Telnetmode' => false) server.cmd("GET / HTTP/1.1\nHost: www.rubyinside.com\n") do |response| puts response end
HTTP/1.1 200 OK Date: Wed, 01 Nov 2006 03:46:11 GMT Server: Apache X-Powered-By: PHP/4.3.11 X-Pingback: http://www.rubyinside.com/xmlrpc.php Status: 200 OK Transfer-Encoding: chunked Content-Type: text/html; charset=UTF-8 .. hundreds of lines of HTML source code for the page removed ..
CHAPTER 15 NETWORKING, SOCKETS, AND DAEMONS
Note After several seconds, there will be a timeout error. This is because you don t know when the
data has been fully received from the Web server. Usually, if no more data is forthcoming, you would close the connection at the timeout. This is one good reason to use a proper HTTP library that handles all of this for you!
Net::Telnet connects to www.rubyinside.com on port 80 (the standard HTTP port) and issues these commands:
GET / HTTP/1.1 Host: www.rubyinside.com
These commands are part of the HTTP protocol and tell the remote Web server to return you the home page for www.rubyinside.com. The response is then printed to the screen where the first eight or so lines are HTTP headers, another part of the HTTP protocol. All these technicalities are shielded from you when you use the open-uri and Net::HTTP libraries, as you did in 14, as those libraries create the correct HTTP commands and process the HTTP responses for you. However, if you need to create a library to deal with a new or currently unsupported protocol in Ruby, you ll probably need to use Net::Telnet or a similar library to get access to the raw TCP data.
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