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5 701 M
(Network Working Group T. Ylonen) s
5 690 M
(Internet-Draft S. Lehtinen) s
5 679 M
(Expires: April 1, 2002 SSH Communications Security Corp) s
5 668 M
( October 2001) s
5 635 M
( SSH File Transfer Protocol) s
5 624 M
( draft-ietf-secsh-filexfer-02.txt) s
5 602 M
(Status of this Memo) s
5 580 M
( This document is an Internet-Draft and is in full conformance with) s
5 569 M
( all provisions of Section 10 of RFC2026.) s
5 547 M
( Internet-Drafts are working documents of the Internet Engineering) s
5 536 M
( Task Force \(IETF\), its areas, and its working groups. Note that) s
5 525 M
( other groups may also distribute working documents as Internet-) s
5 514 M
( Drafts.) s
5 492 M
( Internet-Drafts are draft documents valid for a maximum of six months) s
5 481 M
( and may be updated, replaced, or obsoleted by other documents at any) s
5 470 M
( time. It is inappropriate to use Internet-Drafts as reference) s
5 459 M
( material or to cite them other than as "work in progress.") s
5 437 M
( The list of current Internet-Drafts can be accessed at http://) s
5 426 M
( www.ietf.org/ietf/1id-abstracts.txt.) s
5 404 M
( The list of Internet-Draft Shadow Directories can be accessed at) s
5 393 M
( http://www.ietf.org/shadow.html.) s
5 371 M
( This Internet-Draft will expire on April 1, 2002.) s
5 349 M
(Copyright Notice) s
5 327 M
( Copyright \(C\) The Internet Society \(2001\). All Rights Reserved.) s
5 305 M
(Abstract) s
5 283 M
( The SSH File Transfer Protocol provides secure file transfer) s
5 272 M
( functionality over any reliable data stream. It is the standard file) s
5 261 M
( transfer protocol for use with the SSH2 protocol. This document) s
5 250 M
( describes the file transfer protocol and its interface to the SSH2) s
5 239 M
( protocol suite.) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 1]) s
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5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
(Table of Contents) s
5 668 M
( 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3) s
5 657 M
( 2. Use with the SSH Connection Protocol . . . . . . . . . . . . 4) s
5 646 M
( 3. General Packet Format . . . . . . . . . . . . . . . . . . . 5) s
5 635 M
( 4. Protocol Initialization . . . . . . . . . . . . . . . . . . 7) s
5 624 M
( 5. File Attributes . . . . . . . . . . . . . . . . . . . . . . 8) s
5 613 M
( 6. Requests From the Client to the Server . . . . . . . . . . . 10) s
5 602 M
( 6.1 Request Synchronization and Reordering . . . . . . . . . . . 10) s
5 591 M
( 6.2 File Names . . . . . . . . . . . . . . . . . . . . . . . . . 11) s
5 580 M
( 6.3 Opening, Creating, and Closing Files . . . . . . . . . . . . 11) s
5 569 M
( 6.4 Reading and Writing . . . . . . . . . . . . . . . . . . . . 13) s
5 558 M
( 6.5 Removing and Renaming Files . . . . . . . . . . . . . . . . 14) s
5 547 M
( 6.6 Creating and Deleting Directories . . . . . . . . . . . . . 15) s
5 536 M
( 6.7 Scanning Directories . . . . . . . . . . . . . . . . . . . . 15) s
5 525 M
( 6.8 Retrieving File Attributes . . . . . . . . . . . . . . . . . 16) s
5 514 M
( 6.9 Setting File Attributes . . . . . . . . . . . . . . . . . . 17) s
5 503 M
( 6.10 Dealing with Symbolic links . . . . . . . . . . . . . . . . 18) s
5 492 M
( 6.11 Canonicalizing the Server-Side Path Name . . . . . . . . . . 18) s
5 481 M
( 7. Responses from the Server to the Client . . . . . . . . . . 20) s
5 470 M
( 8. Vendor-Specific Extensions . . . . . . . . . . . . . . . . . 24) s
5 459 M
( 9. Security Considerations . . . . . . . . . . . . . . . . . . 25) s
5 448 M
( 10. Changes from previous protocol versions . . . . . . . . . . 26) s
5 437 M
( 10.1 Changes between versions 3 and 2 . . . . . . . . . . . . . . 26) s
5 426 M
( 10.2 Changes between versions 2 and 1 . . . . . . . . . . . . . . 26) s
5 415 M
( 10.3 Changes between versions 1 and 0 . . . . . . . . . . . . . . 26) s
5 404 M
( 11. Trademark Issues . . . . . . . . . . . . . . . . . . . . . . 27) s
5 393 M
( References . . . . . . . . . . . . . . . . . . . . . . . . . 28) s
5 382 M
( Authors' Addresses . . . . . . . . . . . . . . . . . . . . . 28) s
5 371 M
( Full Copyright Statement . . . . . . . . . . . . . . . . . . 29) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 2]) s
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5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
(1. Introduction) s
5 668 M
( This protocol provides secure file transfer \(and more generally file) s
5 657 M
( system access\) functionality over a reliable data stream, such as a) s
5 646 M
( channel in the SSH2 protocol [3].) s
5 624 M
( This protocol is designed so that it could be used to implement a) s
5 613 M
( secure remote file system service, as well as a secure file transfer) s
5 602 M
( service.) s
5 580 M
( This protocol assumes that it runs over a secure channel, and that) s
5 569 M
( the server has already authenticated the user at the client end, and) s
5 558 M
( that the identity of the client user is externally available to the) s
5 547 M
( server implementation.) s
5 525 M
( In general, this protocol follows a simple request-response model.) s
5 514 M
( Each request and response contains a sequence number and multiple) s
5 503 M
( requests may be pending simultaneously. There are a relatively large) s
5 492 M
( number of different request messages, but a small number of possible) s
5 481 M
( response messages. Each request has one or more response messages) s
5 470 M
( that may be returned in result \(e.g., a read either returns data or) s
5 459 M
( reports error status\).) s
5 437 M
( The packet format descriptions in this specification follow the) s
5 426 M
( notation presented in the secsh architecture draft.[3].) s
5 404 M
( Even though this protocol is described in the context of the SSH2) s
5 393 M
( protocol, this protocol is general and independent of the rest of the) s
5 382 M
( SSH2 protocol suite. It could be used in a number of different) s
5 371 M
( applications, such as secure file transfer over TLS RFC 2246 [1] and) s
5 360 M
( transfer of management information in VPN applications.) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 3]) s
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5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
(2. Use with the SSH Connection Protocol) s
5 668 M
( When used with the SSH2 Protocol suite, this protocol is intended to) s
5 657 M
( be used from the SSH Connection Protocol [5] as a subsystem, as) s
5 646 M
( described in section ``Starting a Shell or a Command''. The) s
5 635 M
( subsystem name used with this protocol is "sftp".) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 4]) s
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5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
(3. General Packet Format) s
5 668 M
( All packets transmitted over the secure connection are of the) s
5 657 M
( following format:) s
5 635 M
( uint32 length) s
5 624 M
( byte type) s
5 613 M
( byte[length - 1] data payload) s
5 591 M
( That is, they are just data preceded by 32-bit length and 8-bit type) s
5 580 M
( fields. The `length' is the length of the data area, and does not) s
5 569 M
( include the `length' field itself. The format and interpretation of) s
5 558 M
( the data area depends on the packet type.) s
5 536 M
( All packet descriptions below only specify the packet type and the) s
5 525 M
( data that goes into the data field. Thus, they should be prefixed by) s
5 514 M
( the `length' and `type' fields.) s
5 492 M
( The maximum size of a packet is in practice determined by the client) s
5 481 M
( \(the maximum size of read or write requests that it sends, plus a few) s
5 470 M
( bytes of packet overhead\). All servers SHOULD support packets of at) s
5 459 M
( least 34000 bytes \(where the packet size refers to the full length,) s
5 448 M
( including the header above\). This should allow for reads and writes) s
5 437 M
( of at most 32768 bytes.) s
5 415 M
( There is no limit on the number of outstanding \(non-acknowledged\)) s
5 404 M
( requests that the client may send to the server. In practice this is) s
5 393 M
( limited by the buffering available on the data stream and the queuing) s
5 382 M
( performed by the server. If the server's queues are full, it should) s
5 371 M
( not read any more data from the stream, and flow control will prevent) s
5 360 M
( the client from sending more requests. Note, however, that while) s
5 349 M
( there is no restriction on the protocol level, the client's API may) s
5 338 M
( provide a limit in order to prevent infinite queuing of outgoing) s
5 327 M
( requests at the client.) s
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(Ylonen & Lehtinen Expires April 1, 2002 [Page 5]) s
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5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
( The following values are defined for packet types.) s
5 668 M
( #define SSH_FXP_INIT 1) s
5 657 M
( #define SSH_FXP_VERSION 2) s
5 646 M
( #define SSH_FXP_OPEN 3) s
5 635 M
( #define SSH_FXP_CLOSE 4) s
5 624 M
( #define SSH_FXP_READ 5) s
5 613 M
( #define SSH_FXP_WRITE 6) s
5 602 M
( #define SSH_FXP_LSTAT 7) s
5 591 M
( #define SSH_FXP_FSTAT 8) s
5 580 M
( #define SSH_FXP_SETSTAT 9) s
5 569 M
( #define SSH_FXP_FSETSTAT 10) s
5 558 M
( #define SSH_FXP_OPENDIR 11) s
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( #define SSH_FXP_READDIR 12) s
5 536 M
( #define SSH_FXP_REMOVE 13) s
5 525 M
( #define SSH_FXP_MKDIR 14) s
5 514 M
( #define SSH_FXP_RMDIR 15) s
5 503 M
( #define SSH_FXP_REALPATH 16) s
5 492 M
( #define SSH_FXP_STAT 17) s
5 481 M
( #define SSH_FXP_RENAME 18) s
5 470 M
( #define SSH_FXP_READLINK 19) s
5 459 M
( #define SSH_FXP_SYMLINK 20) s
5 448 M
( #define SSH_FXP_STATUS 101) s
5 437 M
( #define SSH_FXP_HANDLE 102) s
5 426 M
( #define SSH_FXP_DATA 103) s
5 415 M
( #define SSH_FXP_NAME 104) s
5 404 M
( #define SSH_FXP_ATTRS 105) s
5 393 M
( #define SSH_FXP_EXTENDED 200) s
5 382 M
( #define SSH_FXP_EXTENDED_REPLY 201) s
5 360 M
( Additional packet types should only be defined if the protocol) s
5 349 M
( version number \(see Section ``Protocol Initialization''\) is) s
5 338 M
( incremented, and their use MUST be negotiated using the version) s
5 327 M
( number. However, the SSH_FXP_EXTENDED and SSH_FXP_EXTENDED_REPLY) s
5 316 M
( packets can be used to implement vendor-specific extensions. See) s
5 305 M
( Section ``Vendor-Specific-Extensions'' for more details.) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 6]) s
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595.000000 0.271378 translate
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userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
/showpage{}def/copypage{}def/erasepage{}def
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%%BeginPageSetup
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/pagenum 7 def
/fname () def
/fdir () def
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%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
(4. Protocol Initialization) s
5 668 M
( When the file transfer protocol starts, it first sends a SSH_FXP_INIT) s
5 657 M
( \(including its version number\) packet to the server. The server) s
5 646 M
( responds with a SSH_FXP_VERSION packet, supplying the lowest of its) s
5 635 M
( own and the client's version number. Both parties should from then) s
5 624 M
( on adhere to particular version of the protocol.) s
5 602 M
( The SSH_FXP_INIT packet \(from client to server\) has the following) s
5 591 M
( data:) s
5 569 M
( uint32 version) s
5 558 M
( <extension data>) s
5 536 M
( The SSH_FXP_VERSION packet \(from server to client\) has the following) s
5 525 M
( data:) s
5 503 M
( uint32 version) s
5 492 M
( <extension data>) s
5 470 M
( The version number of the protocol specified in this document is 3.) s
5 459 M
( The version number should be incremented for each incompatible) s
5 448 M
( revision of this protocol.) s
5 426 M
( The extension data in the above packets may be empty, or may be a) s
5 415 M
( sequence of) s
5 393 M
( string extension_name) s
5 382 M
( string extension_data) s
5 360 M
( pairs \(both strings MUST always be present if one is, but the) s
5 349 M
( `extension_data' string may be of zero length\). If present, these) s
5 338 M
( strings indicate extensions to the baseline protocol. The) s
5 327 M
( `extension_name' field\(s\) identify the name of the extension. The) s
5 316 M
( name should be of the form "name@domain", where the domain is the DNS) s
5 305 M
( domain name of the organization defining the extension. Additional) s
5 294 M
( names that are not of this format may be defined later by the IETF.) s
5 283 M
( Implementations MUST silently ignore any extensions whose name they) s
5 272 M
( do not recognize.) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 7]) s
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PStoPSmatrix setmatrix
595.000000 421.271378 translate
90 rotate
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userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
PStoPSxform concat
%%BeginPageSetup
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/fname () def
/fdir () def
/ftail () def
/user_header_p false def
%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
(5. File Attributes) s
5 668 M
( A new compound data type is defined for encoding file attributes. It) s
5 657 M
( is basically just a combination of elementary types, but is defined) s
5 646 M
( once because of the non-trivial description of the fields and to) s
5 635 M
( ensure maintainability.) s
5 613 M
( The same encoding is used both when returning file attributes from) s
5 602 M
( the server and when sending file attributes to the server. When) s
5 591 M
( sending it to the server, the flags field specifies which attributes) s
5 580 M
( are included, and the server will use default values for the) s
5 569 M
( remaining attributes \(or will not modify the values of remaining) s
5 558 M
( attributes\). When receiving attributes from the server, the flags) s
5 547 M
( specify which attributes are included in the returned data. The) s
5 536 M
( server normally returns all attributes it knows about.) s
5 514 M
( uint32 flags) s
5 503 M
( uint64 size present only if flag SSH_FILEXFER_ATTR_SIZE) s
5 492 M
( uint32 uid present only if flag SSH_FILEXFER_ATTR_UIDGID) s
5 481 M
( uint32 gid present only if flag SSH_FILEXFER_ATTR_UIDGID) s
5 470 M
( uint32 permissions present only if flag SSH_FILEXFER_ATTR_PERMISSIONS) s
5 459 M
( uint32 atime present only if flag SSH_FILEXFER_ACMODTIME) s
5 448 M
( uint32 mtime present only if flag SSH_FILEXFER_ACMODTIME) s
5 437 M
( uint32 extended_count present only if flag SSH_FILEXFER_ATTR_EXTENDED) s
5 426 M
( string extended_type) s
5 415 M
( string extended_data) s
5 404 M
( ... more extended data \(extended_type - extended_data pairs\),) s
5 393 M
( so that number of pairs equals extended_count) s
5 371 M
( The `flags' specify which of the fields are present. Those fields) s
5 360 M
( for which the corresponding flag is not set are not present \(not) s
5 349 M
( included in the packet\). New flags can only be added by incrementing) s
5 338 M
( the protocol version number \(or by using the extension mechanism) s
5 327 M
( described below\).) s
5 305 M
( The `size' field specifies the size of the file in bytes.) s
5 283 M
( The `uid' and `gid' fields contain numeric Unix-like user and group) s
5 272 M
( identifiers, respectively.) s
5 250 M
( The `permissions' field contains a bit mask of file permissions as) s
5 239 M
( defined by posix [1].) s
5 217 M
( The `atime' and `mtime' contain the access and modification times of) s
5 206 M
( the files, respectively. They are represented as seconds from Jan 1,) s
5 195 M
( 1970 in UTC.) s
5 173 M
( The SSH_FILEXFER_ATTR_EXTENDED flag provides a general extension) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 8]) s
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595.000000 0.271378 translate
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userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
/showpage{}def/copypage{}def/erasepage{}def
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%%BeginPageSetup
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75 0 translate
/pagenum 9 def
/fname () def
/fdir () def
/ftail () def
/user_header_p false def
%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
( mechanism for vendor-specific extensions. If the flag is specified,) s
5 679 M
( then the `extended_count' field is present. It specifies the number) s
5 668 M
( of extended_type-extended_data pairs that follow. Each of these) s
5 657 M
( pairs specifies an extended attribute. For each of the attributes,) s
5 646 M
( the extended_type field should be a string of the format) s
5 635 M
( "name@domain", where "domain" is a valid, registered domain name and) s
5 624 M
( "name" identifies the method. The IETF may later standardize certain) s
5 613 M
( names that deviate from this format \(e.g., that do not contain the) s
5 602 M
( "@" sign\). The interpretation of `extended_data' depends on the) s
5 591 M
( type. Implementations SHOULD ignore extended data fields that they) s
5 580 M
( do not understand.) s
5 558 M
( Additional fields can be added to the attributes by either defining) s
5 547 M
( additional bits to the flags field to indicate their presence, or by) s
5 536 M
( defining extended attributes for them. The extended attributes) s
5 525 M
( mechanism is recommended for most purposes; additional flags bits) s
5 514 M
( should only be defined by an IETF standards action that also) s
5 503 M
( increments the protocol version number. The use of such new fields) s
5 492 M
( MUST be negotiated by the version number in the protocol exchange.) s
5 481 M
( It is a protocol error if a packet with unsupported protocol bits is) s
5 470 M
( received.) s
5 448 M
( The flags bits are defined to have the following values:) s
5 426 M
( #define SSH_FILEXFER_ATTR_SIZE 0x00000001) s
5 415 M
( #define SSH_FILEXFER_ATTR_UIDGID 0x00000002) s
5 404 M
( #define SSH_FILEXFER_ATTR_PERMISSIONS 0x00000004) s
5 393 M
( #define SSH_FILEXFER_ATTR_ACMODTIME 0x00000008) s
5 382 M
( #define SSH_FILEXFER_ATTR_EXTENDED 0x80000000) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 9]) s
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PStoPSmatrix setmatrix
595.000000 421.271378 translate
90 rotate
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userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
PStoPSxform concat
%%BeginPageSetup
_S
75 0 translate
/pagenum 10 def
/fname () def
/fdir () def
/ftail () def
/user_header_p false def
%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
(6. Requests From the Client to the Server) s
5 668 M
( Requests from the client to the server represent the various file) s
5 657 M
( system operations. Each request begins with an `id' field, which is) s
5 646 M
( a 32-bit identifier identifying the request \(selected by the client\).) s
5 635 M
( The same identifier will be returned in the response to the request.) s
5 624 M
( One possible implementation of it is a monotonically increasing) s
5 613 M
( request sequence number \(modulo 2^32\).) s
5 591 M
( Many operations in the protocol operate on open files. The) s
5 580 M
( SSH_FXP_OPEN request can return a file handle \(which is an opaque) s
5 569 M
( variable-length string\) which may be used to access the file later) s
5 558 M
( \(e.g. in a read operation\). The client MUST NOT send requests the) s
5 547 M
( server with bogus or closed handles. However, the server MUST) s
5 536 M
( perform adequate checks on the handle in order to avoid security) s
5 525 M
( risks due to fabricated handles.) s
5 503 M
( This design allows either stateful and stateless server) s
5 492 M
( implementation, as well as an implementation which caches state) s
5 481 M
( between requests but may also flush it. The contents of the file) s
5 470 M
( handle string are entirely up to the server and its design. The) s
5 459 M
( client should not modify or attempt to interpret the file handle) s
5 448 M
( strings.) s
5 426 M
( The file handle strings MUST NOT be longer than 256 bytes.) s
5 404 M
(6.1 Request Synchronization and Reordering) s
5 382 M
( The protocol and implementations MUST process requests relating to) s
5 371 M
( the same file in the order in which they are received. In other) s
5 360 M
( words, if an application submits multiple requests to the server, the) s
5 349 M
( results in the responses will be the same as if it had sent the) s
5 338 M
( requests one at a time and waited for the response in each case. For) s
5 327 M
( example, the server may process non-overlapping read/write requests) s
5 316 M
( to the same file in parallel, but overlapping reads and writes cannot) s
5 305 M
( be reordered or parallelized. However, there are no ordering) s
5 294 M
( restrictions on the server for processing requests from two different) s
5 283 M
( file transfer connections. The server may interleave and parallelize) s
5 272 M
( them at will.) s
5 250 M
( There are no restrictions on the order in which responses to) s
5 239 M
( outstanding requests are delivered to the client, except that the) s
5 228 M
( server must ensure fairness in the sense that processing of no) s
5 217 M
( request will be indefinitely delayed even if the client is sending) s
5 206 M
( other requests so that there are multiple outstanding requests all) s
5 195 M
( the time.) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 10]) s
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595.000000 0.271378 translate
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userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
/showpage{}def/copypage{}def/erasepage{}def
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%%BeginPageSetup
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75 0 translate
/pagenum 11 def
/fname () def
/fdir () def
/ftail () def
/user_header_p false def
%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
(6.2 File Names) s
5 668 M
( This protocol represents file names as strings. File names are) s
5 657 M
( assumed to use the slash \('/'\) character as a directory separator.) s
5 635 M
( File names starting with a slash are "absolute", and are relative to) s
5 624 M
( the root of the file system. Names starting with any other character) s
5 613 M
( are relative to the user's default directory \(home directory\). Note) s
5 602 M
( that identifying the user is assumed to take place outside of this) s
5 591 M
( protocol.) s
5 569 M
( Servers SHOULD interpret a path name component ".." as referring to) s
5 558 M
( the parent directory, and "." as referring to the current directory.) s
5 547 M
( If the server implementation limits access to certain parts of the) s
5 536 M
( file system, it must be extra careful in parsing file names when) s
5 525 M
( enforcing such restrictions. There have been numerous reported) s
5 514 M
( security bugs where a ".." in a path name has allowed access outside) s
5 503 M
( the intended area.) s
5 481 M
( An empty path name is valid, and it refers to the user's default) s
5 470 M
( directory \(usually the user's home directory\).) s
5 448 M
( Otherwise, no syntax is defined for file names by this specification.) s
5 437 M
( Clients should not make any other assumptions; however, they can) s
5 426 M
( splice path name components returned by SSH_FXP_READDIR together) s
5 415 M
( using a slash \('/'\) as the separator, and that will work as expected.) s
5 393 M
( It is understood that the lack of well-defined semantics for file) s
5 382 M
( names may cause interoperability problems between clients and servers) s
5 371 M
( using radically different operating systems. However, this approach) s
5 360 M
( is known to work acceptably with most systems, and alternative) s
5 349 M
( approaches that e.g. treat file names as sequences of structured) s
5 338 M
( components are quite complicated.) s
5 316 M
(6.3 Opening, Creating, and Closing Files) s
5 294 M
( Files are opened and created using the SSH_FXP_OPEN message, whose) s
5 283 M
( data part is as follows:) s
5 261 M
( uint32 id) s
5 250 M
( string filename) s
5 239 M
( uint32 pflags) s
5 228 M
( ATTRS attrs) s
5 206 M
( The `id' field is the request identifier as for all requests.) s
5 184 M
( The `filename' field specifies the file name. See Section ``File) s
5 173 M
( Names'' for more information.) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 11]) s
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PStoPSmatrix setmatrix
595.000000 421.271378 translate
90 rotate
0.706651 dup scale
userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
PStoPSxform concat
%%BeginPageSetup
_S
75 0 translate
/pagenum 12 def
/fname () def
/fdir () def
/ftail () def
/user_header_p false def
%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
( The `pflags' field is a bitmask. The following bits have been) s
5 679 M
( defined.) s
5 657 M
( #define SSH_FXF_READ 0x00000001) s
5 646 M
( #define SSH_FXF_WRITE 0x00000002) s
5 635 M
( #define SSH_FXF_APPEND 0x00000004) s
5 624 M
( #define SSH_FXF_CREAT 0x00000008) s
5 613 M
( #define SSH_FXF_TRUNC 0x00000010) s
5 602 M
( #define SSH_FXF_EXCL 0x00000020) s
5 580 M
( These have the following meanings:) s
5 558 M
( SSH_FXF_READ) s
5 547 M
( Open the file for reading.) s
5 525 M
( SSH_FXF_WRITE) s
5 514 M
( Open the file for writing. If both this and SSH_FXF_READ are) s
5 503 M
( specified, the file is opened for both reading and writing.) s
5 481 M
( SSH_FXF_APPEND) s
5 470 M
( Force all writes to append data at the end of the file.) s
5 448 M
( SSH_FXF_CREAT) s
5 437 M
( If this flag is specified, then a new file will be created if one) s
5 426 M
( does not already exist \(if O_TRUNC is specified, the new file will) s
5 415 M
( be truncated to zero length if it previously exists\).) s
5 393 M
( SSH_FXF_TRUNC) s
5 382 M
( Forces an existing file with the same name to be truncated to zero) s
5 371 M
( length when creating a file by specifying SSH_FXF_CREAT.) s
5 360 M
( SSH_FXF_CREAT MUST also be specified if this flag is used.) s
5 338 M
( SSH_FXF_EXCL) s
5 327 M
( Causes the request to fail if the named file already exists.) s
5 316 M
( SSH_FXF_CREAT MUST also be specified if this flag is used.) s
5 294 M
( The `attrs' field specifies the initial attributes for the file.) s
5 283 M
( Default values will be used for those attributes that are not) s
5 272 M
( specified. See Section ``File Attributes'' for more information.) s
5 250 M
( Regardless the server operating system, the file will always be) s
5 239 M
( opened in "binary" mode \(i.e., no translations between different) s
5 228 M
( character sets and newline encodings\).) s
5 206 M
( The response to this message will be either SSH_FXP_HANDLE \(if the) s
5 195 M
( operation is successful\) or SSH_FXP_STATUS \(if the operation fails\).) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 12]) s
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userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
/showpage{}def/copypage{}def/erasepage{}def
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%%BeginPageSetup
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75 0 translate
/pagenum 13 def
/fname () def
/fdir () def
/ftail () def
/user_header_p false def
%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
( A file is closed by using the SSH_FXP_CLOSE request. Its data field) s
5 679 M
( has the following format:) s
5 657 M
( uint32 id) s
5 646 M
( string handle) s
5 624 M
( where `id' is the request identifier, and `handle' is a handle) s
5 613 M
( previously returned in the response to SSH_FXP_OPEN or) s
5 602 M
( SSH_FXP_OPENDIR. The handle becomes invalid immediately after this) s
5 591 M
( request has been sent.) s
5 569 M
( The response to this request will be a SSH_FXP_STATUS message. One) s
5 558 M
( should note that on some server platforms even a close can fail.) s
5 547 M
( This can happen e.g. if the server operating system caches writes,) s
5 536 M
( and an error occurs while flushing cached writes during the close.) s
5 514 M
(6.4 Reading and Writing) s
5 492 M
( Once a file has been opened, it can be read using the SSH_FXP_READ) s
5 481 M
( message, which has the following format:) s
5 459 M
( uint32 id) s
5 448 M
( string handle) s
5 437 M
( uint64 offset) s
5 426 M
( uint32 len) s
5 404 M
( where `id' is the request identifier, `handle' is an open file handle) s
5 393 M
( returned by SSH_FXP_OPEN, `offset' is the offset \(in bytes\) relative) s
5 382 M
( to the beginning of the file from where to start reading, and `len') s
5 371 M
( is the maximum number of bytes to read.) s
5 349 M
( In response to this request, the server will read as many bytes as it) s
5 338 M
( can from the file \(up to `len'\), and return them in a SSH_FXP_DATA) s
5 327 M
( message. If an error occurs or EOF is encountered before reading any) s
5 316 M
( data, the server will respond with SSH_FXP_STATUS. For normal disk) s
5 305 M
( files, it is guaranteed that this will read the specified number of) s
5 294 M
( bytes, or up to end of file. For e.g. device files this may return) s
5 283 M
( fewer bytes than requested.) s
5 261 M
( Writing to a file is achieved using the SSH_FXP_WRITE message, which) s
5 250 M
( has the following format:) s
5 228 M
( uint32 id) s
5 217 M
( string handle) s
5 206 M
( uint64 offset) s
5 195 M
( string data) s
5 173 M
( where `id' is a request identifier, `handle' is a file handle) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 13]) s
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userdict/PStoPSsaved save put
PStoPSmatrix setmatrix
595.000000 421.271378 translate
90 rotate
0.706651 dup scale
userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
PStoPSxform concat
%%BeginPageSetup
_S
75 0 translate
/pagenum 14 def
/fname () def
/fdir () def
/ftail () def
/user_header_p false def
%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
( returned by SSH_FXP_OPEN, `offset' is the offset \(in bytes\) from the) s
5 679 M
( beginning of the file where to start writing, and `data' is the data) s
5 668 M
( to be written.) s
5 646 M
( The write will extend the file if writing beyond the end of the file.) s
5 635 M
( It is legal to write way beyond the end of the file; the semantics) s
5 624 M
( are to write zeroes from the end of the file to the specified offset) s
5 613 M
( and then the data. On most operating systems, such writes do not) s
5 602 M
( allocate disk space but instead leave "holes" in the file.) s
5 580 M
( The server responds to a write request with a SSH_FXP_STATUS message.) s
5 558 M
(6.5 Removing and Renaming Files) s
5 536 M
( Files can be removed using the SSH_FXP_REMOVE message. It has the) s
5 525 M
( following format:) s
5 503 M
( uint32 id) s
5 492 M
( string filename) s
5 470 M
( where `id' is the request identifier and `filename' is the name of) s
5 459 M
( the file to be removed. See Section ``File Names'' for more) s
5 448 M
( information. This request cannot be used to remove directories.) s
5 426 M
( The server will respond to this request with a SSH_FXP_STATUS) s
5 415 M
( message.) s
5 393 M
( Files \(and directories\) can be renamed using the SSH_FXP_RENAME) s
5 382 M
( message. Its data is as follows:) s
5 360 M
( uint32 id) s
5 349 M
( string oldpath) s
5 338 M
( string newpath) s
5 316 M
( where `id' is the request identifier, `oldpath' is the name of an) s
5 305 M
( existing file or directory, and `newpath' is the new name for the) s
5 294 M
( file or directory. It is an error if there already exists a file) s
5 283 M
( with the name specified by newpath. The server may also fail rename) s
5 272 M
( requests in other situations, for example if `oldpath' and `newpath') s
5 261 M
( point to different file systems on the server.) s
5 239 M
( The server will respond to this request with a SSH_FXP_STATUS) s
5 228 M
( message.) s
5 129 M
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userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
/showpage{}def/copypage{}def/erasepage{}def
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%%BeginPageSetup
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75 0 translate
/pagenum 15 def
/fname () def
/fdir () def
/ftail () def
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%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
(6.6 Creating and Deleting Directories) s
5 668 M
( New directories can be created using the SSH_FXP_MKDIR request. It) s
5 657 M
( has the following format:) s
5 635 M
( uint32 id) s
5 624 M
( string path) s
5 613 M
( ATTRS attrs) s
5 591 M
( where `id' is the request identifier, `path' and `attrs' specifies) s
5 580 M
( the modifications to be made to its attributes. See Section ``File) s
5 569 M
( Names'' for more information on file names. Attributes are discussed) s
5 558 M
( in more detail in Section ``File Attributes''. specifies the) s
5 547 M
( directory to be created. An error will be returned if a file or) s
5 536 M
( directory with the specified path already exists. The server will) s
5 525 M
( respond to this request with a SSH_FXP_STATUS message.) s
5 503 M
( Directories can be removed using the SSH_FXP_RMDIR request, which) s
5 492 M
( has the following format:) s
5 470 M
( uint32 id) s
5 459 M
( string path) s
5 437 M
( where `id' is the request identifier, and `path' specifies the) s
5 426 M
( directory to be removed. See Section ``File Names'' for more) s
5 415 M
( information on file names. An error will be returned if no directory) s
5 404 M
( with the specified path exists, or if the specified directory is not) s
5 393 M
( empty, or if the path specified a file system object other than a) s
5 382 M
( directory. The server responds to this request with a SSH_FXP_STATUS) s
5 371 M
( message.) s
5 349 M
(6.7 Scanning Directories) s
5 327 M
( The files in a directory can be listed using the SSH_FXP_OPENDIR and) s
5 316 M
( SSH_FXP_READDIR requests. Each SSH_FXP_READDIR request returns one) s
5 305 M
( or more file names with full file attributes for each file. The) s
5 294 M
( client should call SSH_FXP_READDIR repeatedly until it has found the) s
5 283 M
( file it is looking for or until the server responds with a) s
5 272 M
( SSH_FXP_STATUS message indicating an error \(normally SSH_FX_EOF if) s
5 261 M
( there are no more files in the directory\). The client should then) s
5 250 M
( close the handle using the SSH_FXP_CLOSE request.) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 15]) s
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595.000000 421.271378 translate
90 rotate
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userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
PStoPSxform concat
%%BeginPageSetup
_S
75 0 translate
/pagenum 16 def
/fname () def
/fdir () def
/ftail () def
/user_header_p false def
%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
( The SSH_FXP_OPENDIR opens a directory for reading. It has the) s
5 679 M
( following format:) s
5 657 M
( uint32 id) s
5 646 M
( string path) s
5 624 M
( where `id' is the request identifier and `path' is the path name of) s
5 613 M
( the directory to be listed \(without any trailing slash\). See Section) s
5 602 M
( ``File Names'' for more information on file names. This will return) s
5 591 M
( an error if the path does not specify a directory or if the directory) s
5 580 M
( is not readable. The server will respond to this request with either) s
5 569 M
( a SSH_FXP_HANDLE or a SSH_FXP_STATUS message.) s
5 547 M
( Once the directory has been successfully opened, files \(and) s
5 536 M
( directories\) contained in it can be listed using SSH_FXP_READDIR) s
5 525 M
( requests. These are of the format) s
5 503 M
( uint32 id) s
5 492 M
( string handle) s
5 470 M
( where `id' is the request identifier, and `handle' is a handle) s
5 459 M
( returned by SSH_FXP_OPENDIR. \(It is a protocol error to attempt to) s
5 448 M
( use an ordinary file handle returned by SSH_FXP_OPEN.\)) s
5 426 M
( The server responds to this request with either a SSH_FXP_NAME or a) s
5 415 M
( SSH_FXP_STATUS message. One or more names may be returned at a time.) s
5 404 M
( Full status information is returned for each name in order to speed) s
5 393 M
( up typical directory listings.) s
5 371 M
( When the client no longer wishes to read more names from the) s
5 360 M
( directory, it SHOULD call SSH_FXP_CLOSE for the handle. The handle) s
5 349 M
( should be closed regardless of whether an error has occurred or not.) s
5 327 M
(6.8 Retrieving File Attributes) s
5 305 M
( Very often, file attributes are automatically returned by) s
5 294 M
( SSH_FXP_READDIR. However, sometimes there is need to specifically) s
5 283 M
( retrieve the attributes for a named file. This can be done using the) s
5 272 M
( SSH_FXP_STAT, SSH_FXP_LSTAT and SSH_FXP_FSTAT requests.) s
5 250 M
( SSH_FXP_STAT and SSH_FXP_LSTAT only differ in that SSH_FXP_STAT) s
5 239 M
( follows symbolic links on the server, whereas SSH_FXP_LSTAT does not) s
5 228 M
( follow symbolic links. Both have the same format:) s
5 206 M
( uint32 id) s
5 195 M
( string path) s
5 173 M
( where `id' is the request identifier, and `path' specifies the file) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 16]) s
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595.000000 0.271378 translate
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userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
/showpage{}def/copypage{}def/erasepage{}def
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%%BeginPageSetup
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75 0 translate
/pagenum 17 def
/fname () def
/fdir () def
/ftail () def
/user_header_p false def
%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
( system object for which status is to be returned. The server) s
5 679 M
( responds to this request with either SSH_FXP_ATTRS or SSH_FXP_STATUS.) s
5 657 M
( SSH_FXP_FSTAT differs from the others in that it returns status) s
5 646 M
( information for an open file \(identified by the file handle\). Its) s
5 635 M
( format is as follows:) s
5 613 M
( uint32 id) s
5 602 M
( string handle) s
5 580 M
( where `id' is the request identifier and `handle' is a file handle) s
5 569 M
( returned by SSH_FXP_OPEN. The server responds to this request with) s
5 558 M
( SSH_FXP_ATTRS or SSH_FXP_STATUS.) s
5 536 M
(6.9 Setting File Attributes) s
5 514 M
( File attributes may be modified using the SSH_FXP_SETSTAT and) s
5 503 M
( SSH_FXP_FSETSTAT requests. These requests are used for operations) s
5 492 M
( such as changing the ownership, permissions or access times, as well) s
5 481 M
( as for truncating a file.) s
5 459 M
( The SSH_FXP_SETSTAT request is of the following format:) s
5 437 M
( uint32 id) s
5 426 M
( string path) s
5 415 M
( ATTRS attrs) s
5 393 M
( where `id' is the request identifier, `path' specifies the file) s
5 382 M
( system object \(e.g. file or directory\) whose attributes are to be) s
5 371 M
( modified, and `attrs' specifies the modifications to be made to its) s
5 360 M
( attributes. Attributes are discussed in more detail in Section) s
5 349 M
( ``File Attributes''.) s
5 327 M
( An error will be returned if the specified file system object does) s
5 316 M
( not exist or the user does not have sufficient rights to modify the) s
5 305 M
( specified attributes. The server responds to this request with a) s
5 294 M
( SSH_FXP_STATUS message.) s
5 272 M
( The SSH_FXP_FSETSTAT request modifies the attributes of a file which) s
5 261 M
( is already open. It has the following format:) s
5 239 M
( uint32 id) s
5 228 M
( string handle) s
5 217 M
( ATTRS attrs) s
5 195 M
( where `id' is the request identifier, `handle' \(MUST be returned by) s
5 184 M
( SSH_FXP_OPEN\) identifies the file whose attributes are to be) s
5 173 M
( modified, and `attrs' specifies the modifications to be made to its) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 17]) s
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PStoPSmatrix setmatrix
595.000000 421.271378 translate
90 rotate
0.706651 dup scale
userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
PStoPSxform concat
%%BeginPageSetup
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75 0 translate
/pagenum 18 def
/fname () def
/fdir () def
/ftail () def
/user_header_p false def
%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
( attributes. Attributes are discussed in more detail in Section) s
5 679 M
( ``File Attributes''. The server will respond to this request with) s
5 668 M
( SSH_FXP_STATUS.) s
5 646 M
(6.10 Dealing with Symbolic links) s
5 624 M
( The SSH_FXP_READLINK request may be used to read the target of a) s
5 613 M
( symbolic link. It would have a data part as follows:) s
5 591 M
( uint32 id) s
5 580 M
( string path) s
5 558 M
( where `id' is the request identifier and `path' specifies the path) s
5 547 M
( name of the symlink to be read.) s
5 525 M
( The server will respond with a SSH_FXP_NAME packet containing only) s
5 514 M
( one name and a dummy attributes value. The name in the returned) s
5 503 M
( packet contains the target of the link. If an error occurs, the) s
5 492 M
( server may respond with SSH_FXP_STATUS.) s
5 470 M
( The SSH_FXP_SYMLINK request will create a symbolic link on the) s
5 459 M
( server. It is of the following format) s
5 437 M
( uint32 id) s
5 426 M
( string linkpath) s
5 415 M
( string targetpath) s
5 393 M
( where `id' is the request identifier, `linkpath' specifies the path) s
5 382 M
( name of the symlink to be created and `targetpath' specifies the) s
5 371 M
( target of the symlink. The server shall respond with a) s
5 360 M
( SSH_FXP_STATUS indicating either success \(SSH_FX_OK\) or an error) s
5 349 M
( condition.) s
5 327 M
(6.11 Canonicalizing the Server-Side Path Name) s
5 305 M
( The SSH_FXP_REALPATH request can be used to have the server) s
5 294 M
( canonicalize any given path name to an absolute path. This is useful) s
5 283 M
( for converting path names containing ".." components or relative) s
5 272 M
( pathnames without a leading slash into absolute paths. The format of) s
5 261 M
( the request is as follows:) s
5 239 M
( uint32 id) s
5 228 M
( string path) s
5 206 M
( where `id' is the request identifier and `path' specifies the path) s
5 195 M
( name to be canonicalized. The server will respond with a) s
5 184 M
( SSH_FXP_NAME packet containing only one name and a dummy attributes) s
5 173 M
( value. The name is the returned packet will be in canonical form.) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 18]) s
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userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
/showpage{}def/copypage{}def/erasepage{}def
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%%BeginPageSetup
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/pagenum 19 def
/fname () def
/fdir () def
/ftail () def
/user_header_p false def
%%EndPageSetup
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(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
( If an error occurs, the server may also respond with SSH_FXP_STATUS.) s
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(Ylonen & Lehtinen Expires April 1, 2002 [Page 19]) s
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userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
PStoPSxform concat
%%BeginPageSetup
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/pagenum 20 def
/fname () def
/fdir () def
/ftail () def
/user_header_p false def
%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
(7. Responses from the Server to the Client) s
5 668 M
( The server responds to the client using one of a few response) s
5 657 M
( packets. All requests can return a SSH_FXP_STATUS response upon) s
5 646 M
( failure. When the operation is successful, any of the responses may) s
5 635 M
( be returned \(depending on the operation\). If no data needs to be) s
5 624 M
( returned to the client, the SSH_FXP_STATUS response with SSH_FX_OK) s
5 613 M
( status is appropriate. Otherwise, the SSH_FXP_HANDLE message is used) s
5 602 M
( to return a file handle \(for SSH_FXP_OPEN and SSH_FXP_OPENDIR) s
5 591 M
( requests\), SSH_FXP_DATA is used to return data from SSH_FXP_READ,) s
5 580 M
( SSH_FXP_NAME is used to return one or more file names from a) s
5 569 M
( SSH_FXP_READDIR or SSH_FXP_REALPATH request, and SSH_FXP_ATTRS is) s
5 558 M
( used to return file attributes from SSH_FXP_STAT, SSH_FXP_LSTAT, and) s
5 547 M
( SSH_FXP_FSTAT requests.) s
5 525 M
( Exactly one response will be returned for each request. Each) s
5 514 M
( response packet contains a request identifier which can be used to) s
5 503 M
( match each response with the corresponding request. Note that it is) s
5 492 M
( legal to have several requests outstanding simultaneously, and the) s
5 481 M
( server is allowed to send responses to them in a different order from) s
5 470 M
( the order in which the requests were sent \(the result of their) s
5 459 M
( execution, however, is guaranteed to be as if they had been processed) s
5 448 M
( one at a time in the order in which the requests were sent\).) s
5 426 M
( Response packets are of the same general format as request packets.) s
5 415 M
( Each response packet begins with the request identifier.) s
5 393 M
( The format of the data portion of the SSH_FXP_STATUS response is as) s
5 382 M
( follows:) s
5 360 M
( uint32 id) s
5 349 M
( uint32 error/status code) s
5 338 M
( string error message \(ISO-10646 UTF-8 [RFC-2279]\)) s
5 327 M
( string language tag \(as defined in [RFC-1766]\)) s
5 305 M
( where `id' is the request identifier, and `error/status code') s
5 294 M
( indicates the result of the requested operation. The value SSH_FX_OK) s
5 283 M
( indicates success, and all other values indicate failure.) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 20]) s
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userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
/showpage{}def/copypage{}def/erasepage{}def
PStoPSxform concat
%%BeginPageSetup
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75 0 translate
/pagenum 21 def
/fname () def
/fdir () def
/ftail () def
/user_header_p false def
%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
( Currently, the following values are defined \(other values may be) s
5 679 M
( defined by future versions of this protocol\):) s
5 657 M
( #define SSH_FX_OK 0) s
5 646 M
( #define SSH_FX_EOF 1) s
5 635 M
( #define SSH_FX_NO_SUCH_FILE 2) s
5 624 M
( #define SSH_FX_PERMISSION_DENIED 3) s
5 613 M
( #define SSH_FX_FAILURE 4) s
5 602 M
( #define SSH_FX_BAD_MESSAGE 5) s
5 591 M
( #define SSH_FX_NO_CONNECTION 6) s
5 580 M
( #define SSH_FX_CONNECTION_LOST 7) s
5 569 M
( #define SSH_FX_OP_UNSUPPORTED 8) s
5 547 M
( SSH_FX_OK) s
5 536 M
( Indicates successful completion of the operation.) s
5 514 M
( SSH_FX_EOF) s
5 503 M
( indicates end-of-file condition; for SSH_FX_READ it means that no) s
5 492 M
( more data is available in the file, and for SSH_FX_READDIR it) s
5 481 M
( indicates that no more files are contained in the directory.) s
5 459 M
( SSH_FX_NO_SUCH_FILE) s
5 448 M
( is returned when a reference is made to a file which should exist) s
5 437 M
( but doesn't.) s
5 415 M
( SSH_FX_PERMISSION_DENIED) s
5 404 M
( is returned when the authenticated user does not have sufficient) s
5 393 M
( permissions to perform the operation.) s
5 371 M
( SSH_FX_FAILURE) s
5 360 M
( is a generic catch-all error message; it should be returned if an) s
5 349 M
( error occurs for which there is no more specific error code) s
5 338 M
( defined.) s
5 316 M
( SSH_FX_BAD_MESSAGE) s
5 305 M
( may be returned if a badly formatted packet or protocol) s
5 294 M
( incompatibility is detected.) s
5 272 M
( SSH_FX_NO_CONNECTION) s
5 261 M
( is a pseudo-error which indicates that the client has no) s
5 250 M
( connection to the server \(it can only be generated locally by the) s
5 239 M
( client, and MUST NOT be returned by servers\).) s
5 217 M
( SSH_FX_CONNECTION_LOST) s
5 206 M
( is a pseudo-error which indicates that the connection to the) s
5 195 M
( server has been lost \(it can only be generated locally by the) s
5 184 M
( client, and MUST NOT be returned by servers\).) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 21]) s
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0.706651 dup scale
userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
PStoPSxform concat
%%BeginPageSetup
_S
75 0 translate
/pagenum 22 def
/fname () def
/fdir () def
/ftail () def
/user_header_p false def
%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
( SSH_FX_OP_UNSUPPORTED) s
5 679 M
( indicates that an attempt was made to perform an operation which) s
5 668 M
( is not supported for the server \(it may be generated locally by) s
5 657 M
( the client if e.g. the version number exchange indicates that a) s
5 646 M
( required feature is not supported by the server, or it may be) s
5 635 M
( returned by the server if the server does not implement an) s
5 624 M
( operation\).) s
5 602 M
( The SSH_FXP_HANDLE response has the following format:) s
5 580 M
( uint32 id) s
5 569 M
( string handle) s
5 547 M
( where `id' is the request identifier, and `handle' is an arbitrary) s
5 536 M
( string that identifies an open file or directory on the server. The) s
5 525 M
( handle is opaque to the client; the client MUST NOT attempt to) s
5 514 M
( interpret or modify it in any way. The length of the handle string) s
5 503 M
( MUST NOT exceed 256 data bytes.) s
5 481 M
( The SSH_FXP_DATA response has the following format:) s
5 459 M
( uint32 id) s
5 448 M
( string data) s
5 426 M
( where `id' is the request identifier, and `data' is an arbitrary byte) s
5 415 M
( string containing the requested data. The data string may be at most) s
5 404 M
( the number of bytes requested in a SSH_FXP_READ request, but may also) s
5 393 M
( be shorter if end of file is reached or if the read is from something) s
5 382 M
( other than a regular file.) s
5 360 M
( The SSH_FXP_NAME response has the following format:) s
5 338 M
( uint32 id) s
5 327 M
( uint32 count) s
5 316 M
( repeats count times:) s
5 305 M
( string filename) s
5 294 M
( string longname) s
5 283 M
( ATTRS attrs) s
5 261 M
( where `id' is the request identifier, `count' is the number of names) s
5 250 M
( returned in this response, and the remaining fields repeat `count') s
5 239 M
( times \(so that all three fields are first included for the first) s
5 228 M
( file, then for the second file, etc\). In the repeated part,) s
5 217 M
( `filename' is a file name being returned \(for SSH_FXP_READDIR, it) s
5 206 M
( will be a relative name within the directory, without any path) s
5 195 M
( components; for SSH_FXP_REALPATH it will be an absolute path name\),) s
5 184 M
( `longname' is an expanded format for the file name, similar to what) s
5 173 M
( is returned by "ls -l" on Unix systems, and `attrs' is the attributes) s
5 129 M
(Ylonen & Lehtinen Expires April 1, 2002 [Page 22]) s
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userdict/PStoPSmatrix matrix currentmatrix put
userdict/PStoPSclip{0 0 moveto
595.000000 0 rlineto 0 842.000000 rlineto -595.000000 0 rlineto
closepath}put initclip
/showpage{}def/copypage{}def/erasepage{}def
PStoPSxform concat
%%BeginPageSetup
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75 0 translate
/pagenum 23 def
/fname () def
/fdir () def
/ftail () def
/user_header_p false def
%%EndPageSetup
5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
( of the file as described in Section ``File Attributes''.) s
5 668 M
( The format of the `longname' field is unspecified by this protocol.) s
5 657 M
( It MUST be suitable for use in the output of a directory listing) s
5 646 M
( command \(in fact, the recommended operation for a directory listing) s
5 635 M
( command is to simply display this data\). However, clients SHOULD NOT) s
5 624 M
( attempt to parse the longname field for file attributes; they SHOULD) s
5 613 M
( use the attrs field instead.) s
5 591 M
( The recommended format for the longname field is as follows:) s
5 569 M
( -rwxr-xr-x 1 mjos staff 348911 Mar 25 14:29 t-filexfer) s
5 558 M
( 1234567890 123 12345678 12345678 12345678 123456789012) s
5 536 M
( Here, the first line is sample output, and the second field indicates) s
5 525 M
( widths of the various fields. Fields are separated by spaces. The) s
5 514 M
( first field lists file permissions for user, group, and others; the) s
5 503 M
( second field is link count; the third field is the name of the user) s
5 492 M
( who owns the file; the fourth field is the name of the group that) s
5 481 M
( owns the file; the fifth field is the size of the file in bytes; the) s
5 470 M
( sixth field \(which actually may contain spaces, but is fixed to 12) s
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( characters\) is the file modification time, and the seventh field is) s
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( the file name. Each field is specified to be a minimum of certain) s
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( number of character positions \(indicated by the second line above\),) s
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( but may also be longer if the data does not fit in the specified) s
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( length.) s
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( The SSH_FXP_ATTRS response has the following format:) s
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( uint32 id) s
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( ATTRS attrs) s
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( where `id' is the request identifier, and `attrs' is the returned) s
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( file attributes as described in Section ``File Attributes''.) s
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(Internet-Draft SSH File Transfer Protocol October 2001) s
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(8. Vendor-Specific Extensions) s
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( The SSH_FXP_EXTENDED request provides a generic extension mechanism) s
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( for adding vendor-specific commands. The request has the following) s
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( format:) s
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( uint32 id) s
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( string extended-request) s
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( ... any request-specific data ...) s
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( where `id' is the request identifier, and `extended-request' is a) s
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( string of the format "name@domain", where domain is an internet) s
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( domain name of the vendor defining the request. The rest of the) s
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( request is completely vendor-specific, and servers should only) s
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( attempt to interpret it if they recognize the `extended-request') s
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( name.) s
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( The server may respond to such requests using any of the response) s
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( packets defined in Section ``Responses from the Server to the) s
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( Client''. Additionally, the server may also respond with a) s
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( SSH_FXP_EXTENDED_REPLY packet, as defined below. If the server does) s
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( not recognize the `extended-request' name, then the server MUST) s
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( respond with SSH_FXP_STATUS with error/status set to) s
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( SSH_FX_OP_UNSUPPORTED.) s
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( The SSH_FXP_EXTENDED_REPLY packet can be used to carry arbitrary) s
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( extension-specific data from the server to the client. It is of the) s
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( following format:) s
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( uint32 id) s
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( ... any request-specific data ...) s
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(Ylonen & Lehtinen Expires April 1, 2002 [Page 24]) s
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5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
(9. Security Considerations) s
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( This protocol assumes that it is run over a secure channel and that) s
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( the endpoints of the channel have been authenticated. Thus, this) s
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( protocol assumes that it is externally protected from network-level) s
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( attacks.) s
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( This protocol provides file system access to arbitrary files on the) s
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( server \(only constrained by the server implementation\). It is the) s
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( responsibility of the server implementation to enforce any access) s
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( controls that may be required to limit the access allowed for any) s
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( particular user \(the user being authenticated externally to this) s
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( protocol, typically using the SSH User Authentication Protocol [6].) s
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( Care must be taken in the server implementation to check the validity) s
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( of received file handle strings. The server should not rely on them) s
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( directly; it MUST check the validity of each handle before relying on) s
5 503 M
( it.) s
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(Ylonen & Lehtinen Expires April 1, 2002 [Page 25]) s
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5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
(10. Changes from previous protocol versions) s
5 668 M
( The SSH File Transfer Protocol has changed over time, before it's) s
5 657 M
( standardization. The following is a description of the incompatible) s
5 646 M
( changes between different versions.) s
5 624 M
(10.1 Changes between versions 3 and 2) s
5 602 M
( o The SSH_FXP_READLINK and SSH_FXP_SYMLINK messages were added.) s
5 580 M
( o The SSH_FXP_EXTENDED and SSH_FXP_EXTENDED_REPLY messages were) s
5 569 M
( added.) s
5 547 M
( o The SSH_FXP_STATUS message was changed to include fields `error) s
5 536 M
( message' and `language tag'.) s
5 503 M
(10.2 Changes between versions 2 and 1) s
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( o The SSH_FXP_RENAME message was added.) s
5 448 M
(10.3 Changes between versions 1 and 0) s
5 426 M
( o Implementation changes, no actual protocol changes.) s
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(Ylonen & Lehtinen Expires April 1, 2002 [Page 26]) s
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5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
(11. Trademark Issues) s
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( "ssh" is a registered trademark of SSH Communications Security Corp) s
5 657 M
( in the United States and/or other countries.) s
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(Ylonen & Lehtinen Expires April 1, 2002 [Page 27]) s
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5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
(References) s
5 668 M
( [1] Dierks, T., Allen, C., Treese, W., Karlton, P., Freier, A. and) s
5 657 M
( P. Kocher, "The TLS Protocol Version 1.0", RFC 2246, January) s
5 646 M
( 1999.) s
5 624 M
( [2] Institute of Electrical and Electronics Engineers, "Information) s
5 613 M
( Technology - Portable Operating System Interface \(POSIX\) - Part) s
5 602 M
( 1: System Application Program Interface \(API\) [C Language]",) s
5 591 M
( IEEE Standard 1003.2, 1996.) s
5 569 M
( [3] Rinne, T., Ylonen, T., Kivinen, T., Saarinen, M. and S.) s
5 558 M
( Lehtinen, "SSH Protocol Architecture", draft-ietf-secsh-) s
5 547 M
( architecture-09 \(work in progress\), July 2001.) s
5 525 M
( [4] Rinne, T., Ylonen, T., Kivinen, T., Saarinen, M. and S.) s
5 514 M
( Lehtinen, "SSH Protocol Transport Protocol", draft-ietf-secsh-) s
5 503 M
( architecture-09 \(work in progress\), July 2001.) s
5 481 M
( [5] Rinne, T., Ylonen, T., Kivinen, T., Saarinen, M. and S.) s
5 470 M
( Lehtinen, "SSH Connection Protocol", draft-ietf-secsh-connect-11) s
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( \(work in progress\), July 2001.) s
5 437 M
( [6] Rinne, T., Ylonen, T., Kivinen, T., Saarinen, M. and S.) s
5 426 M
( Lehtinen, "SSH Authentication Protocol", draft-ietf-secsh-) s
5 415 M
( userauth-11 \(work in progress\), July 2001.) s
5 382 M
(Authors' Addresses) s
5 360 M
( Tatu Ylonen) s
5 349 M
( SSH Communications Security Corp) s
5 338 M
( Fredrikinkatu 42) s
5 327 M
( HELSINKI FIN-00100) s
5 316 M
( Finland) s
5 294 M
( EMail: [email protected]) s
5 261 M
( Sami Lehtinen) s
5 250 M
( SSH Communications Security Corp) s
5 239 M
( Fredrikinkatu 42) s
5 228 M
( HELSINKI FIN-00100) s
5 217 M
( Finland) s
5 195 M
( EMail: [email protected]) s
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(Ylonen & Lehtinen Expires April 1, 2002 [Page 28]) s
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5 723 M
(Internet-Draft SSH File Transfer Protocol October 2001) s
5 690 M
(Full Copyright Statement) s
5 668 M
( Copyright \(C\) The Internet Society \(2001\). All Rights Reserved.) s
5 646 M
( This document and translations of it may be copied and furnished to) s
5 635 M
( others, and derivative works that comment on or otherwise explain it) s
5 624 M
( or assist in its implementation may be prepared, copied, published) s
5 613 M
( and distributed, in whole or in part, without restriction of any) s
5 602 M
( kind, provided that the above copyright notice and this paragraph are) s
5 591 M
( included on all such copies and derivative works. However, this) s
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( document itself may not be modified in any way, such as by removing) s
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( the copyright notice or references to the Internet Society or other) s
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( Internet organizations, except as needed for the purpose of) s
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( developing Internet standards in which case the procedures for) s
5 536 M
( copyrights defined in the Internet Standards process must be) s
5 525 M
( followed, or as required to translate it into languages other than) s
5 514 M
( English.) s
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( The limited permissions granted above are perpetual and will not be) s
5 481 M
( revoked by the Internet Society or its successors or assigns.) s
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( This document and the information contained herein is provided on an) s
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( "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING) s
5 437 M
( TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING) s
5 426 M
( BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION) s
5 415 M
( HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF) s
5 404 M
( MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.) s
5 382 M
(Acknowledgement) s
5 360 M
( Funding for the RFC Editor function is currently provided by the) s
5 349 M
( Internet Society.) s
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(Ylonen & Lehtinen Expires April 1, 2002 [Page 29]) s
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%%Trailer
%%Pages: 30
%%DocumentNeededResources: font Courier-Bold Courier
%%EOF
