Add subsystem channel request support (RFC 4254 §6.5)#98
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kruton merged 2 commits intokruton:mainfrom Apr 4, 2026
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Add requestSubsystem(name) to SshSession interface and SessionChannel implementation, enabling subsystem invocation (e.g. SFTP) on session channels. Follows the same pattern as requestShell(). Integration tests verify: - SFTP subsystem opens and responds to SSH_FXP_INIT with SSH_FXP_VERSION - Unknown subsystem names are rejected by the server
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Summary
Adds
requestSubsystem(name: String): Booleanto theSshSessioninterface andSessionChannelimplementation, enabling subsystem invocation (e.g. SFTP) on session channels.This is a prerequisite for SFTP support (discussed in #96). Follows the same pattern as
requestShell().Changes
SshSession.kt— addedrequestSubsystem(name: String): Booleanto the interfaceSessionChannel.kt— implementation usingChannelRequestSubsystemprotocol messageSshClientIntegrationTest.kt— two integration tests:Test plan
./gradlew :sshlib:test— integration tests pass against OpenSSH testcontainer