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#!/usr/bin/ruby


require "net/smtp"
require "getoptlong"
require "socket"

opts = GetoptLong.new(
        [ '--to', '-t', GetoptLong::REQUIRED_ARGUMENT],
        [ '--from', '-f', GetoptLong::REQUIRED_ARGUMENT],
        [ '--server', '-s', GetoptLong::REQUIRED_ARGUMENT]
)

to = false
from = false
server = false
msg = ""

opts.each { |opt, arg|
        case opt
        when '--to'
                to = arg
        when '--from'
                from = arg
        when '--server'
                server = arg
        end
}

unless (to && from && server)
        puts ("Please specify to (-t), from (-f) and smtp server (-s)")
        exit
end

$stdin.each { |line|
        msg << line
}

begin
        smtp = Net::SMTP.new(server, 25)
        smtp.open_timeout=60
        smtp.read_timeout=90

        smtp.start(Socket.gethostname) do |s|
                s.send_message msg, from, to
        end
rescue Net::SMTPFatalError => e
        puts("Fatal error while sending message to #{to} via #{server}: #{e}");
rescue Net::SMTPServerBusy => e
        puts("Failed to send message to #{to} via #{server}, try again later: #{e}");
rescue Timeout::Error => e
        puts("Timeout reached while sending message to #{to} via #{server}, try again later: #{e}");
rescue Exception => e
        puts("Unknown error while sending message to #{to} via #{server}: #{e.class} #{e}")
end