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#
#--
#= $RCSfile$ -- Buffering mix-in module.
#
#= Info
# 'OpenSSL for Ruby 2' project
# Copyright (C) 2001 GOTOU YUUZOU <gotoyuzo@notwork.org>
# All rights reserved.
#
#= Licence
# This program is licenced under the same licence as Ruby.
# (See the file 'LICENCE'.)
#
#= Version
# $Id: buffering.rb 45053 2014-02-19 17:14:45Z nagachika $
#++
##
# OpenSSL IO buffering mix-in module.
#
# This module allows an OpenSSL::SSL::SSLSocket to behave like an IO.
module OpenSSL::Buffering
include Enumerable
##
# The "sync mode" of the SSLSocket.
#
# See IO#sync for full details.
attr_accessor :sync
##
# Default size to read from or write to the SSLSocket for buffer operations.
BLOCK_SIZE = 1024*16
def initialize(*args)
@eof = false
@rbuffer = ""
@sync = @io.sync
end
#
# for reading.
#
private
##
# Fills the buffer from the underlying SSLSocket
def fill_rbuff
begin
@rbuffer << self.sysread(BLOCK_SIZE)
rescue Errno::EAGAIN
retry
rescue EOFError
@eof = true
end
end
##
# Consumes +size+ bytes from the buffer
def consume_rbuff(size=nil)
if @rbuffer.empty?
nil
else
size = @rbuffer.size unless size
ret = @rbuffer[0, size]
@rbuffer[0, size] = ""
ret
end
end
public
##
# 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.
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
##
# 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.
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
raise EOFError if ret.empty?
ret
end
##
# 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.
#
# OpenSSL::Buffering#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. http://www.openssl.org/support/faq.html
def read_nonblock(maxlen, buf=nil)
if maxlen == 0
if buf
buf.clear
return buf
else
return ""
end
end
if @rbuffer.empty?
return sysread_nonblock(maxlen, buf)
end
ret = consume_rbuff(maxlen)
if buf
buf.replace(ret)
ret = buf
end
raise EOFError if ret.empty?
ret
end
##
# 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 +$_+.
#
# Unlike IO#gets the separator must be provided if a limit is provided.
def gets(eol=$/, 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+$&.size : nil
else
size = idx ? idx+eol.size : nil
end
if limit and limit >= 0
size = [size, limit].min
end
consume_rbuff(size)
end
##
# Executes the block for every line in the stream where lines are separated
# by +eol+.
#
# See also #gets
def each(eol=$/)
while line = self.gets(eol)
yield line
end
end
alias each_line each
##
# Reads lines from the stream which are separated by +eol+.
#
# See also #gets
def readlines(eol=$/)
ary = []
while line = self.gets(eol)
ary << line
end
ary
end
##
# Reads a line from the stream which is separated by +eol+.
#
# Raises EOFError if at end of file.
def readline(eol=$/)
raise EOFError if eof?
gets(eol)
end
##
# Reads one character from the stream. Returns nil if called at end of
# file.
def getc
read(1)
end
##
# Calls the given block once for each byte in the stream.
def each_byte # :yields: byte
while c = getc
yield(c.ord)
end
end
##
# Reads a one-character string from the stream. Raises an EOFError at end
# of file.
def readchar
raise EOFError if eof?
getc
end
##
# 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).
def ungetc(c)
@rbuffer[0,0] = c.chr
end
##
# Returns true if the stream is at file which means there is no more data to
# be read.
def eof?
fill_rbuff if !@eof && @rbuffer.empty?
@eof && @rbuffer.empty?
end
alias eof eof?
#
# for writing.
#
private
##
# Writes +s+ to the buffer. When the buffer is full or #sync is true the
# buffer is flushed to the underlying socket.
def do_write(s)
@wbuffer = "" unless defined? @wbuffer
@wbuffer << s
@wbuffer.force_encoding(Encoding::BINARY)
@sync ||= false
if @sync or @wbuffer.size > BLOCK_SIZE or idx = @wbuffer.rindex($/)
remain = idx ? idx + $/.size : @wbuffer.length
nwritten = 0
while remain > 0
str = @wbuffer[nwritten,remain]
begin
nwrote = syswrite(str)
rescue Errno::EAGAIN
retry
end
remain -= nwrote
nwritten += nwrote
end
@wbuffer[0,nwritten] = ""
end
end
public
##
# Writes +s+ to the stream. If the argument is not a string it will be
# converted using String#to_s. Returns the number of bytes written.
def write(s)
do_write(s)
s.bytesize
end
##
# Writes +str+ 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 OpenSSL::Buffering#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. http://www.openssl.org/support/faq.html
def write_nonblock(s)
flush
syswrite_nonblock(s)
end
##
# Writes +s+ to the stream. +s+ will be converted to a String using
# String#to_s.
def << (s)
do_write(s)
self
end
##
# Writes +args+ to the stream along with a record separator.
#
# See IO#puts for full details.
def puts(*args)
s = ""
if args.empty?
s << "\n"
end
args.each{|arg|
s << arg.to_s
if $/ && /\n\z/ !~ s
s << "\n"
end
}
do_write(s)
nil
end
##
# Writes +args+ to the stream.
#
# See IO#print for full details.
def print(*args)
s = ""
args.each{ |arg| s << arg.to_s }
do_write(s)
nil
end
##
# Formats and writes to the stream converting parameters under control of
# the format string.
#
# See Kernel#sprintf for format string details.
def printf(s, *args)
do_write(s % args)
nil
end
##
# Flushes buffered data to the SSLSocket.
def flush
osync = @sync
@sync = true
do_write ""
return self
ensure
@sync = osync
end
##
# Closes the SSLSocket and flushes any unwritten data.
def close
flush rescue nil
sysclose
end
end