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version 1.6, 2001/05/22 00:37:20

version 1.7, 2003/11/21 11:57:02

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This document is intended for those who wish to read the ssh source

code. This tries to give an overview of the structure of the code.

Updated 17 Nov 1995.

Updated 19 Oct 1999 for OpenSSH-1.2

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these programs.

Buffer manipulation routines

- These provide an arbitrary size buffer, where data can be appended.

Data can be consumed from either end. The code is used heavily

throughout ssh. The basic buffer manipulation functions are in

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data types is in bufaux.c.

Compression Library

- Ssh uses the GNU GZIP compression library (ZLIB).

Encryption/Decryption

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code is linked into the server. The routines also manipulate

known hosts files using code in hostfile.c. Code in canohost.c

is used to retrieve the canonical host name of the remote host.

Code in match.c is used to match host names.

- In the client end, authentication code is in sshconnect.c. It

reads Passwords/passphrases using code in readpass.c. It reads

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operations, and finally the server enters the normal session

mode by calling server_loop in serverloop.c. This does the real

work, calling functions in other modules.

- The code for the server is in sshd.c. It contains a lot of

stuff, including:

- server main program

- waiting for connections

- processing new connection

- authentication

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- There are several other files in the distribution that contain

various auxiliary routines:

ssh.h the main header file for ssh (various definitions)

getput.h byte-order independent storage of integers

includes.h includes most system headers. Lots of #ifdefs.

tildexpand.c expand tilde in file names

uidswap.c uid-swapping

xmalloc.c "safe" malloc routines