SNI test

imap.rb

>> require 'net/imap'
=> true
>> Net::IMAP.new "imap.gmail.com", 993, true
OpenSSL::SSL::SSLError: SSL_connect returned=1 errno=0 state=error: certificate verify failed (self signed certificate)
from /usr/lib/ruby/2.5.0/net/protocol.rb:44:in `connect_nonblock'
>> m = <<~SNI_test
 | def start_tls_session(params = {})
 |     unless defined?(OpenSSL::SSL)
 |       raise "SSL extension not installed"
 |     end
 |     if @sock.kind_of?(OpenSSL::SSL::SSLSocket)
 |       raise RuntimeError, "already using SSL"
 |     end
 |     begin
 |       params = params.to_hash
 |     rescue NoMethodError
 |       params = {}
 |     end
 |     context = SSLContext.new
 |     context.set_params(params)
 |     if defined?(VerifyCallbackProc)
 |       context.verify_callback = VerifyCallbackProc
 |     end
 |     @sock = SSLSocket.new(@sock, context)
 |     @sock.sync_close = true
 |     # added OpenSSL::SSL::SSLSocket#hostname= for SNI
 |     @sock.hostname = @host
 |     ssl_socket_connect(@sock, @open_timeout)
 |     if context.verify_mode != VERIFY_NONE
 |       @sock.post_connection_check(@host)
 |     end
 |   end
 | SNI_test
=> "def start_tls_session(params = {})\n    unless defined?(OpenSSL::SSL)\n      raise \"SSL extension not installed\"\n    end\n    if @sock.kind_of?(OpenSSL::SSL::SSLSocket)\n      raise RuntimeError, \"already using SSL\"\n    end\n    begin\n      params = params.to_hash\n    rescue NoMethodError\n      params = {}\n    end\n    context = SSLContext.new\n    context.set_params(params)\n    if defined?(VerifyCallbackProc)\n      context.verify_callback = VerifyCallbackProc\n    end\n    @sock = SSLSocket.new(@sock, context)\n    @sock.sync_close = true\n    # added OpenSSL::SSL::SSLSocket#hostname= for SNI\n    @sock.hostname = @host\n    ssl_socket_connect(@sock, @open_timeout)\n    if context.verify_mode != VERIFY_NONE\n      @sock.post_connection_check(@host)\n    end\n  end\n"
>> Net::IMAP.module_eval m
=> :start_tls_session
>> 
>> Net::IMAP.new "imap.gmail.com", 993, true
=> #<Net::IMAP:0x00005641dfc09ff0
 @client_thread=#<Thread:0x00005641dd664b88 run>,
 @continuation_request_arrival=#<MonitorMixin::ConditionVariable:0x00005641dfc088f8 @cond=#<Thread::ConditionVariable:0x00005641dfc088d0>, @monitor=#<Net::IMAP:0x00005641dfc09ff0 ...>>,
 @continuation_request_exception=nil,
 @continued_command_tag=nil,
 @debug_output_bol=true,
 @exception=nil,
 @greeting=
  #<struct Net::IMAP::UntaggedResponse
   name="OK",
   data=#<struct Net::IMAP::ResponseText code=nil, text="Gimap ready for requests from 90.195.240.250 o23mb482518366wmf">,
   raw_data="* OK Gimap ready for requests from 90.195.240.250 o23mb482518366wmf\r\n">,
 @host="imap.gmail.com",
 @idle_done_cond=nil,
 @logout_command_tag=nil,
 @mon_count=0,
 @mon_mutex=#<Thread::Mutex:0x00005641dfc09fa0>,
 @mon_owner=nil,
 @open_timeout=30,
 @parser=#<Net::IMAP::ResponseParser:0x00005641dfc09e10 @flag_symbols={}, @lex_state=:EXPR_BEG, @pos=69, @str="* OK Gimap ready for requests from 90.195.240.250 o23mb482518366wmf\r\n", @token=nil>,
 @port=993,
 @receiver_thread=#<Thread:0x00005641dfbf7df0@/usr/lib/ruby/2.5.0/net/imap.rb:1118 sleep>,
 @receiver_thread_terminating=false,
 @response_handlers=[],
 @responses={},
 @sock=
  #<OpenSSL::SSL::SSLSocket:0x00005641dfc09ac8
   @context=
    #<OpenSSL::SSL::SSLContext:0x00005641dfc09c08
     @cert_store=#<OpenSSL::X509::Store:0x00005641dfad83c0 @chain=nil, @error=nil, @error_string=nil, @time=nil, @verify_callback=nil>,
     @max_proto_version=nil,
     @min_proto_version=769,
     @verify_hostname=true,
     @verify_mode=1>,
   @eof=false,
   @hostname="imap.gmail.com",
   @io=#<Socket:fd 10>,
   @rbuffer="",
   @sync=true,
   @sync_close=true>,
 @tag_prefix="RUBY",
 @tagged_response_arrival=#<MonitorMixin::ConditionVariable:0x00005641dfc08948 @cond=#<Thread::ConditionVariable:0x00005641dfc08920>, @monitor=#<Net::IMAP:0x00005641dfc09ff0 ...>>,
 @tagged_responses={},
 @tagno=0,
 @usessl=true>
>>