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  • openssl/lib/openssl/buffering.rb

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OpenSSL::Buffering

OpenSSL IO buffering mix-in module.

This module allows an OpenSSL::SSL::SSLSocket to behave like an IO.

You typically won’t use this module directly, you can see it implemented in OpenSSL::SSL::SSLSocket.

Constants

BLOCK_SIZE

Default size to read from or write to the SSLSocket for buffer operations.

Attributes

sync[RW]

The “sync mode” of the SSLSocket.

See IO#sync for full details.

Public Class Methods

new(*) click to toggle source

Creates an instance of OpenSSL’s buffering IO module.

 
               # File openssl/lib/openssl/buffering.rb, line 62
def initialize(*)
  super
  @eof = false
  @rbuffer = Buffer.new
  @sync = @io.sync
end

Public Instance Methods

<<(s) click to toggle source

Writes s to the stream. s will be converted to a String using .to_s method.

 
               # File openssl/lib/openssl/buffering.rb, line 412
def <<(s)
  do_write(s)
  self
end
close() click to toggle source

Closes the SSLSocket and flushes any unwritten data.

 
               # File openssl/lib/openssl/buffering.rb, line 473
def close
  flush rescue nil
  sysclose
end
each(eol=$/) click to toggle source

Executes the block for every line in the stream where lines are separated by eol.

See also gets

 
               # File openssl/lib/openssl/buffering.rb, line 249
def each(eol=$/)
  while line = self.gets(eol)
    yield line
  end
end
Also aliased as: each_line
each_byte() click to toggle source

Calls the given block once for each byte in the stream.

 
               # File openssl/lib/openssl/buffering.rb, line 290
def each_byte # :yields: byte
  while c = getc
    yield(c.ord)
  end
end
each_line(eol=$/) click to toggle source
Alias for: each
eof() click to toggle source
Alias for: eof?
eof?() click to toggle source

Returns true if the stream is at file which means there is no more data to be read.

 
               # File openssl/lib/openssl/buffering.rb, line 321
def eof?
  fill_rbuff if !@eof && @rbuffer.empty?
  @eof && @rbuffer.empty?
end
Also aliased as: eof
flush() click to toggle source

Flushes buffered data to the SSLSocket.

 
               # File openssl/lib/openssl/buffering.rb, line 461
def flush
  osync = @sync
  @sync = true
  do_write ""
  return self
ensure
  @sync = osync
end
getc() click to toggle source

Reads one character from the stream. Returns nil if called at end of file.

 
               # File openssl/lib/openssl/buffering.rb, line 283
def getc
  read(1)
end
gets(eol=$/, limit=nil) click to toggle source

Reads the next “line” from the stream. Lines are separated by eol. If limit is provided the result will not be longer than the given number of bytes.

eol may be a String or Regexp.

Unlike IO#gets the line read will not be assigned to +$_+.

Unlike IO#gets the separator must be provided if a limit is provided.

 
               # File openssl/lib/openssl/buffering.rb, line 225
def gets(eol=$/, limit=nil)
  idx = @rbuffer.index(eol)
  until @eof
    break if idx
    fill_rbuff
    idx = @rbuffer.index(eol)
  end
  if eol.is_a?(Regexp)
    size = idx ? idx+$&.size : nil
  else
    size = idx ? idx+eol.size : nil
  end
  if size && limit && limit >= 0
    size = [size, limit].min
  end
  consume_rbuff(size)
end
print(*args) click to toggle source

Writes args to the stream.

See IO#print for full details.

printf(s, *args) click to toggle source

Formats and writes to the stream converting parameters under control of the format string.

See Kernel#sprintf for format string details.

 
               # File openssl/lib/openssl/buffering.rb, line 453
def printf(s, *args)
  do_write(s % args)
  nil
end
puts(*args) click to toggle source

Writes args to the stream along with a record separator.

See IO#puts for full details.

 
               # File openssl/lib/openssl/buffering.rb, line 422
def puts(*args)
  s = Buffer.new
  if args.empty?
    s << "\n"
  end
  args.each{|arg|
    s << arg.to_s
    s.sub!(/(?<!\n)\z/, "\n")
  }
  do_write(s)
  nil
end
read(size=nil, buf=nil) click to toggle source

Reads size bytes from the stream. If buf is provided it must reference a string which will receive the data.

See IO#read for full details.

 
               # File openssl/lib/openssl/buffering.rb, line 109
def read(size=nil, buf=nil)
  if size == 0
    if buf
      buf.clear
      return buf
    else
      return ""
    end
  end
  until @eof
    break if size && size <= @rbuffer.size
    fill_rbuff
  end
  ret = consume_rbuff(size) || ""
  if buf
    buf.replace(ret)
    ret = buf
  end
  (size && ret.empty?) ? nil : ret
end
read_nonblock(maxlen, buf=nil, exception: true) click to toggle source

Reads at most maxlen bytes in the non-blocking manner.

When no data can be read without blocking it raises OpenSSL::SSL::SSLError extended by IO::WaitReadable or IO::WaitWritable.

IO::WaitReadable means SSL needs to read internally so #read_nonblock should be called again when the underlying IO is readable.

IO::WaitWritable means SSL needs to write internally so #read_nonblock should be called again after the underlying IO is writable.

#read_nonblock needs two rescue clause as follows:

# emulates blocking read (readpartial).
begin
  result = ssl.read_nonblock(maxlen)
rescue IO::WaitReadable
  IO.select([io])
  retry
rescue IO::WaitWritable
  IO.select(nil, [io])
  retry
end

Note that one reason that #read_nonblock writes to the underlying IO is when the peer requests a new TLS/SSL handshake. See openssl the FAQ for more details. www.openssl.org/support/faq.html

By specifying a keyword argument exception to false, you can indicate that #read_nonblock should not raise an IO::Wait*able exception, but return the symbol :wait_writable or :wait_readable instead. At EOF, it will return nil instead of raising EOFError.

 
               # File openssl/lib/openssl/buffering.rb, line 194
def read_nonblock(maxlen, buf=nil, exception: true)
  if maxlen == 0
    if buf
      buf.clear
      return buf
    else
      return ""
    end
  end
  if @rbuffer.empty?
    return sysread_nonblock(maxlen, buf, exception: exception)
  end
  ret = consume_rbuff(maxlen)
  if buf
    buf.replace(ret)
    ret = buf
  end
  ret
end
readchar() click to toggle source

Reads a one-character string from the stream. Raises an EOFError at end of file.

 
               # File openssl/lib/openssl/buffering.rb, line 300
def readchar
  raise EOFError if eof?
  getc
end
readline(eol=$/) click to toggle source

Reads a line from the stream which is separated by eol.

Raises EOFError if at end of file.

 
               # File openssl/lib/openssl/buffering.rb, line 274
def readline(eol=$/)
  raise EOFError if eof?
  gets(eol)
end
readlines(eol=$/) click to toggle source

Reads lines from the stream which are separated by eol.

See also gets

 
               # File openssl/lib/openssl/buffering.rb, line 261
def readlines(eol=$/)
  ary = []
  while line = self.gets(eol)
    ary << line
  end
  ary
end
readpartial(maxlen, buf=nil) click to toggle source

Reads at most maxlen bytes from the stream. If buf is provided it must reference a string which will receive the data.

See IO#readpartial for full details.

 
               # File openssl/lib/openssl/buffering.rb, line 136
def readpartial(maxlen, buf=nil)
  if maxlen == 0
    if buf
      buf.clear
      return buf
    else
      return ""
    end
  end
  if @rbuffer.empty?
    begin
      return sysread(maxlen, buf)
    rescue Errno::EAGAIN
      retry
    end
  end
  ret = consume_rbuff(maxlen)
  if buf
    buf.replace(ret)
    ret = buf
  end
  ret
end
ungetc(c) click to toggle source

Pushes character c back onto the stream such that a subsequent buffered character read will return it.

Unlike IO#getc multiple bytes may be pushed back onto the stream.

Has no effect on unbuffered reads (such as sysread).

 
               # File openssl/lib/openssl/buffering.rb, line 313
def ungetc(c)
  @rbuffer[0,0] = c.chr
end
write(*s) click to toggle source

Writes s to the stream. If the argument is not a String it will be converted using .to_s method. Returns the number of bytes written.

 
               # File openssl/lib/openssl/buffering.rb, line 359
def write(*s)
  s.inject(0) do |written, str|
    do_write(str)
    written + str.bytesize
  end
end
write_nonblock(s, exception: true) click to toggle source

Writes s in the non-blocking manner.

If there is buffered data, it is flushed first. This may block.

#write_nonblock returns number of bytes written to the SSL connection.

When no data can be written without blocking it raises OpenSSL::SSL::SSLError extended by IO::WaitReadable or IO::WaitWritable.

IO::WaitReadable means SSL needs to read internally so #write_nonblock should be called again after the underlying IO is readable.

IO::WaitWritable means SSL needs to write internally so #write_nonblock should be called again after underlying IO is writable.

So #write_nonblock needs two rescue clause as follows.

# emulates blocking write.
begin
  result = ssl.write_nonblock(str)
rescue IO::WaitReadable
  IO.select([io])
  retry
rescue IO::WaitWritable
  IO.select(nil, [io])
  retry
end

Note that one reason that #write_nonblock reads from the underlying IO is when the peer requests a new TLS/SSL handshake. See the openssl FAQ for more details. www.openssl.org/support/faq.html

By specifying a keyword argument exception to false, you can indicate that #write_nonblock should not raise an IO::Wait*able exception, but return the symbol :wait_writable or :wait_readable instead.

 
               # File openssl/lib/openssl/buffering.rb, line 403
def write_nonblock(s, exception: true)
  flush
  syswrite_nonblock(s, exception: exception)
end