Implement SSH Phase 6: Channel protocol with command execution
Phase 6 completed:
- SSH_MSG_CHANNEL_OPEN handling
- SSH_MSG_CHANNEL_OPEN_CONFIRMATION/FAILURE responses
- SSH_MSG_CHANNEL_REQUEST handling (exec, env, shell, subsystem)
- SSH_MSG_CHANNEL_DATA transmission (command output)
- SSH_MSG_CHANNEL_EOF/CLOSE handling
- Command execution via shell (sh -c)
- Encrypted packet handling in service loop
Test results:
- SSH connection successful with channel creation
- Command execution working: 'echo', 'whoami', 'pwd', 'ls'
- Output correctly transmitted via CHANNEL_DATA
- EOF and CLOSE properly sent after execution
- Multiple commands working correctly
Files modified:
- channel.rs: Channel management, command execution, output buffering
- server.rs: Encrypted service loop, channel output handling
Progress: SSH implementation 95% complete (Phase 1-6)
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