Message

Implementation of an SSH2 “message”.

class paramiko.message.Message(content=None)

An SSH2 message is a stream of bytes that encodes some combination of strings, integers, bools, and infinite-precision integers (known in Python as longs). This class builds or breaks down such a byte stream.

Normally you don’t need to deal with anything this low-level, but it’s exposed for people implementing custom extensions, or features that paramiko doesn’t support yet.

__init__(content=None)

Create a new SSH2 message.

Parameters

content (str) – the byte stream to use as the message content (passed in only when decomposing a message).

add(*seq)

Add a sequence of items to the stream. The values are encoded based on their type: str, int, bool, list. Does not support int larger than 2**32 - 1

Parameters

seq – the sequence of items

add_boolean(b)

Add a boolean value to the stream.

Parameters

b (bool) – boolean value to add

add_byte(b)

Write a single byte to the stream, without any formatting.

Parameters

b (str) – byte to add

add_bytes(b)

Write bytes to the stream, without any formatting.

Parameters

b (str) – bytes to add

add_int(n)

Add an integer to the stream.

Parameters

n (int) – integer to add

add_int64(n)

Add a 64-bit int to the stream.

Parameters

n (long) – long int to add

add_list(l)

Add a list of strings to the stream. They are encoded identically to a single string of values separated by commas. (Yes, really, that’s how SSH2 does it.)

Parameters

l – list of strings to add

add_mpint(z)

Add a long int to the stream, encoded as an infinite-precision integer. This method only works on positive numbers.

Parameters

z (long) – long int to add

add_string(s)

Add a string to the stream.

Parameters

s (str) – string to add

asbytes()

Return the byte stream content of this Message, as bytes.

get_binary()

Fetch a string from the stream. This could be a byte string and may contain unprintable characters. (It’s not unheard of for a string to contain another byte-stream Message.)

get_boolean()

Fetch a boolean from the stream.

get_byte()

Return the next byte of the message, without decomposing it. This is equivalent to get_bytes(1).

Returns

the next (str) byte of the message, or '\' if there aren’t any bytes remaining.

get_bytes(n)

Return the next n bytes of the message (as a str), without decomposing into an int, decoded string, etc. Just the raw bytes are returned. Returns a string of n zero bytes if there weren’t n bytes remaining in the message.

get_int()

Fetch an int from the stream.

get_int64()

Fetch a 64-bit int from the stream.

Returns

a 64-bit unsigned integer (long).

get_list()

Fetch a list of strings from the stream.

These are trivially encoded as comma-separated values in a string.

get_mpint()

Fetch a long int (mpint) from the stream.

Returns

an arbitrary-length integer (long).

get_remainder()

Return the bytes (as a str) of this message that haven’t already been parsed and returned.

get_so_far()

Returns the str bytes of this message that have been parsed and returned. The string passed into a message’s constructor can be regenerated by concatenating get_so_far and get_remainder.

get_string()

Fetch a str from the stream. This could be a byte string and may contain unprintable characters. (It’s not unheard of for a string to contain another byte-stream message.)

get_text()

Fetch a Unicode string from the stream.

rewind()

Rewind the message to the beginning as if no items had been parsed out of it yet.