diff options
Diffstat (limited to 'PROTOCOL')
| -rw-r--r-- | PROTOCOL | 45 |
1 files changed, 44 insertions, 1 deletions
@@ -481,6 +481,49 @@ See the "setstat" command for more details. This extension is advertised in the SSH_FXP_VERSION hello with version "1". +3.8. sftp: Extension request "limits@openssh.com" + +This request is used to determine various limits the server might impose. +Clients should not attempt to exceed these limits as the server might sever +the connection immediately. + + uint32 id + string "limits@openssh.com" + +The server will respond with a SSH_FXP_EXTENDED_REPLY reply: + + uint32 id + uint64 max-packet-length + uint64 max-read-length + uint64 max-write-length + uint64 max-open-handles + +The 'max-packet-length' applies to the total number of bytes in a +single SFTP packet. Servers SHOULD set this at least to 34000. + +The 'max-read-length' is the largest length in a SSH_FXP_READ packet. +Even if the client requests a larger size, servers will usually respond +with a shorter SSH_FXP_DATA packet. Servers SHOULD set this at least to +32768. + +The 'max-write-length' is the largest length in a SSH_FXP_WRITE packet +the server will accept. Servers SHOULD set this at least to 32768. + +The 'max-open-handles' is the maximum number of active handles that the +server allows (e.g. handles created by SSH_FXP_OPEN and SSH_FXP_OPENDIR +packets). Servers MAY count internal file handles against this limit +(e.g. system logging or stdout/stderr), so clients SHOULD NOT expect to +open this many handles in practice. + +If the server doesn't enforce a specific limit, then the field may be +set to 0. This implies the server relies on the OS to enforce limits +(e.g. available memory or file handles), and such limits might be +dynamic. The client SHOULD take care to not try to exceed reasonable +limits. + +This extension is advertised in the SSH_FXP_VERSION hello with version +"1". + 4. Miscellaneous changes 4.1 Public key format @@ -512,4 +555,4 @@ OpenSSH's connection multiplexing uses messages as described in PROTOCOL.mux over a Unix domain socket for communications between a master instance and later clients. -$OpenBSD: PROTOCOL,v 1.39 2021/02/12 03:49:09 djm Exp $ +$OpenBSD: PROTOCOL,v 1.40 2021/02/18 00:30:17 djm Exp $ |