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SSH2: simplify _send_channel_packet

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the last _send_channel_packet was unnecessarily complex. this lead
to a number of problems. for example,

the window size was checked for adjustments in two places. in the
second place it receives a window adjustment packet and just assumes
that the window adjustment packet was big enough for the rest of the
data.

(thanks, pixall!)
This commit is contained in:
terrafrost 2014-12-05 22:01:39 -06:00
parent 1698880660
commit 96eb1f3797
1 changed files with 12 additions and 30 deletions
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42
phpseclib/Net/SSH2.php
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@ -3275,27 +3275,23 @@ class Net_SSH2
*/ */
function _send_channel_packet($client_channel, $data) function _send_channel_packet($client_channel, $data)
{ {
/* The maximum amount of data allowed is determined by the maximum while (strlen($data)) {
packet size for the channel, and the current window size, whichever
is smaller.
-- http://tools.ietf.org/html/rfc4254#section-5.2 */
$max_size = min(
$this->packet_size_client_to_server[$client_channel],
$this->window_size_client_to_server[$client_channel]
);
while (strlen($data) > $max_size) {
if (!$this->window_size_client_to_server[$client_channel]) { if (!$this->window_size_client_to_server[$client_channel]) {
$this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST; $this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST;
// using an invalid channel will let the buffers be built up for the valid channels // using an invalid channel will let the buffers be built up for the valid channels
$output = $this->_get_channel_packet(-1); $this->_get_channel_packet(-1);
$this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST; $this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST;
$max_size = min(
$this->packet_size_client_to_server[$client_channel],
$this->window_size_client_to_server[$client_channel]
);
} }
/* The maximum amount of data allowed is determined by the maximum
packet size for the channel, and the current window size, whichever
is smaller.
-- http://tools.ietf.org/html/rfc4254#section-5.2 */
$max_size = min(
$this->packet_size_client_to_server[$client_channel],
$this->window_size_client_to_server[$client_channel]
);
$temp = $this->_string_shift($data, $max_size); $temp = $this->_string_shift($data, $max_size);
$packet = pack('CN2a*', $packet = pack('CN2a*',
NET_SSH2_MSG_CHANNEL_DATA, NET_SSH2_MSG_CHANNEL_DATA,
@ -3303,27 +3299,13 @@ class Net_SSH2
strlen($temp), strlen($temp),
$temp $temp
); );
$this->window_size_client_to_server[$client_channel]-= strlen($temp); $this->window_size_client_to_server[$client_channel]-= strlen($temp);
if (!$this->_send_binary_packet($packet)) { if (!$this->_send_binary_packet($packet)) {
return false; return false;
} }
} }
if (strlen($data) >= $this->window_size_client_to_server[$client_channel]) { return true;
$this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST;
$this->_get_channel_packet(-1);
$this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST;
}
$this->window_size_client_to_server[$client_channel]-= strlen($data);
return $this->_send_binary_packet(pack('CN2a*',
NET_SSH2_MSG_CHANNEL_DATA,
$this->server_channels[$client_channel],
strlen($data),
$data));
} }
/** /**