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putty/sftp.h

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20 KiB
C
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/*
* sftp.h: definitions for SFTP and the sftp.c routines.
*/
#include "defs.h"
#define SSH_FXP_INIT 1 /* 0x1 */
#define SSH_FXP_VERSION 2 /* 0x2 */
#define SSH_FXP_OPEN 3 /* 0x3 */
#define SSH_FXP_CLOSE 4 /* 0x4 */
#define SSH_FXP_READ 5 /* 0x5 */
#define SSH_FXP_WRITE 6 /* 0x6 */
#define SSH_FXP_LSTAT 7 /* 0x7 */
#define SSH_FXP_FSTAT 8 /* 0x8 */
#define SSH_FXP_SETSTAT 9 /* 0x9 */
#define SSH_FXP_FSETSTAT 10 /* 0xa */
#define SSH_FXP_OPENDIR 11 /* 0xb */
#define SSH_FXP_READDIR 12 /* 0xc */
#define SSH_FXP_REMOVE 13 /* 0xd */
#define SSH_FXP_MKDIR 14 /* 0xe */
#define SSH_FXP_RMDIR 15 /* 0xf */
#define SSH_FXP_REALPATH 16 /* 0x10 */
#define SSH_FXP_STAT 17 /* 0x11 */
#define SSH_FXP_RENAME 18 /* 0x12 */
#define SSH_FXP_STATUS 101 /* 0x65 */
#define SSH_FXP_HANDLE 102 /* 0x66 */
#define SSH_FXP_DATA 103 /* 0x67 */
#define SSH_FXP_NAME 104 /* 0x68 */
#define SSH_FXP_ATTRS 105 /* 0x69 */
#define SSH_FXP_EXTENDED 200 /* 0xc8 */
#define SSH_FXP_EXTENDED_REPLY 201 /* 0xc9 */
#define SSH_FX_OK 0
#define SSH_FX_EOF 1
#define SSH_FX_NO_SUCH_FILE 2
#define SSH_FX_PERMISSION_DENIED 3
#define SSH_FX_FAILURE 4
#define SSH_FX_BAD_MESSAGE 5
#define SSH_FX_NO_CONNECTION 6
#define SSH_FX_CONNECTION_LOST 7
#define SSH_FX_OP_UNSUPPORTED 8
#define SSH_FILEXFER_ATTR_SIZE 0x00000001
#define SSH_FILEXFER_ATTR_UIDGID 0x00000002
#define SSH_FILEXFER_ATTR_PERMISSIONS 0x00000004
#define SSH_FILEXFER_ATTR_ACMODTIME 0x00000008
#define SSH_FILEXFER_ATTR_EXTENDED 0x80000000
#define SSH_FXF_READ 0x00000001
#define SSH_FXF_WRITE 0x00000002
#define SSH_FXF_APPEND 0x00000004
#define SSH_FXF_CREAT 0x00000008
#define SSH_FXF_TRUNC 0x00000010
#define SSH_FXF_EXCL 0x00000020
#define SFTP_PROTO_VERSION 3
#define PERMS_DIRECTORY 040000
/*
* External references. The sftp client module sftp.c expects to be
* able to get at these functions.
*
* sftp_recvdata must never return less than len. It either blocks
* until len is available and then returns true, or it returns false
* for failure.
*
* sftp_senddata returns true on success, false on failure.
*
* sftp_sendbuffer returns the size of the backlog of data in the
* transmit queue.
*/
bool sftp_senddata(const char *data, size_t len);
size_t sftp_sendbuffer(void);
bool sftp_recvdata(char *data, size_t len);
/*
* Free sftp_requests
*/
void sftp_cleanup_request(void);
struct fxp_attrs {
unsigned long flags;
uint64_t size;
unsigned long uid;
unsigned long gid;
unsigned long permissions;
unsigned long atime;
unsigned long mtime;
};
extern const struct fxp_attrs no_attrs;
/*
* Copy between the possibly-unused permissions field in an fxp_attrs
* and a possibly-negative integer containing the same permissions.
*/
#define PUT_PERMISSIONS(attrs, perms) \
((perms) >= 0 ? \
((attrs).flags |= SSH_FILEXFER_ATTR_PERMISSIONS, \
(attrs).permissions = (perms)) : \
((attrs).flags &= ~SSH_FILEXFER_ATTR_PERMISSIONS))
#define GET_PERMISSIONS(attrs, defaultperms) \
((attrs).flags & SSH_FILEXFER_ATTR_PERMISSIONS ? \
(attrs).permissions : defaultperms)
struct fxp_handle {
char *hstring;
int hlen;
};
struct fxp_name {
char *filename, *longname;
struct fxp_attrs attrs;
};
struct fxp_names {
int nnames;
struct fxp_name *names;
};
struct sftp_request;
/*
* Packet-manipulation functions.
*/
struct sftp_packet {
char *data;
size_t length, maxlen, savedpos;
int type;
BinarySink_IMPLEMENTATION;
BinarySource_IMPLEMENTATION;
};
/* When sending a packet, create it with sftp_pkt_init, then add
* things to it by treating it as a BinarySink. When it's done, call
* sftp_send_prepare, and then pkt->data and pkt->length describe its
* wire format. */
struct sftp_packet *sftp_pkt_init(int pkt_type);
void sftp_send_prepare(struct sftp_packet *pkt);
/* When receiving a packet, create it with sftp_recv_prepare once you
* decode its length from the first 4 bytes of wire data. Then write
* that many bytes into pkt->data, and call sftp_recv_finish to set up
* the type code and BinarySource. */
struct sftp_packet *sftp_recv_prepare(unsigned length);
bool sftp_recv_finish(struct sftp_packet *pkt);
/* Either kind of packet can be freed afterwards with sftp_pkt_free. */
void sftp_pkt_free(struct sftp_packet *pkt);
void BinarySink_put_fxp_attrs(BinarySink *bs, struct fxp_attrs attrs);
bool BinarySource_get_fxp_attrs(BinarySource *src, struct fxp_attrs *attrs);
#define put_fxp_attrs(bs, attrs) \
BinarySink_put_fxp_attrs(BinarySink_UPCAST(bs), attrs)
#define get_fxp_attrs(bs, attrs) \
BinarySource_get_fxp_attrs(BinarySource_UPCAST(bs), attrs)
/*
* Error handling.
*/
const char *fxp_error(void);
int fxp_error_type(void);
/*
* Perform exchange of init/version packets. Return false on failure.
*/
bool fxp_init(void);
/*
* Canonify a pathname. Concatenate the two given path elements
* with a separating slash, unless the second is NULL.
*/
struct sftp_request *fxp_realpath_send(const char *path);
char *fxp_realpath_recv(struct sftp_packet *pktin, struct sftp_request *req);
/*
* Open a file. 'attrs' contains attributes to be applied to the file
* if it's being created.
*/
struct sftp_request *fxp_open_send(const char *path, int type,
const struct fxp_attrs *attrs);
struct fxp_handle *fxp_open_recv(struct sftp_packet *pktin,
struct sftp_request *req);
/*
* Open a directory.
*/
struct sftp_request *fxp_opendir_send(const char *path);
struct fxp_handle *fxp_opendir_recv(struct sftp_packet *pktin,
struct sftp_request *req);
/*
* Close a file/dir. Returns true on success, false on error.
*/
struct sftp_request *fxp_close_send(struct fxp_handle *handle);
bool fxp_close_recv(struct sftp_packet *pktin, struct sftp_request *req);
/*
* Make a directory.
*/
struct sftp_request *fxp_mkdir_send(const char *path,
const struct fxp_attrs *attrs);
bool fxp_mkdir_recv(struct sftp_packet *pktin, struct sftp_request *req);
/*
* Remove a directory.
*/
struct sftp_request *fxp_rmdir_send(const char *path);
bool fxp_rmdir_recv(struct sftp_packet *pktin, struct sftp_request *req);
/*
* Remove a file.
*/
struct sftp_request *fxp_remove_send(const char *fname);
bool fxp_remove_recv(struct sftp_packet *pktin, struct sftp_request *req);
/*
* Rename a file.
*/
struct sftp_request *fxp_rename_send(const char *srcfname,
const char *dstfname);
bool fxp_rename_recv(struct sftp_packet *pktin, struct sftp_request *req);
/*
* Return file attributes.
*/
struct sftp_request *fxp_stat_send(const char *fname);
bool fxp_stat_recv(struct sftp_packet *pktin, struct sftp_request *req,
struct fxp_attrs *attrs);
struct sftp_request *fxp_fstat_send(struct fxp_handle *handle);
bool fxp_fstat_recv(struct sftp_packet *pktin, struct sftp_request *req,
struct fxp_attrs *attrs);
/*
* Set file attributes.
*/
struct sftp_request *fxp_setstat_send(const char *fname,
struct fxp_attrs attrs);
bool fxp_setstat_recv(struct sftp_packet *pktin, struct sftp_request *req);
struct sftp_request *fxp_fsetstat_send(struct fxp_handle *handle,
struct fxp_attrs attrs);
bool fxp_fsetstat_recv(struct sftp_packet *pktin, struct sftp_request *req);
/*
* Read from a file.
*/
struct sftp_request *fxp_read_send(struct fxp_handle *handle,
uint64_t offset, int len);
int fxp_read_recv(struct sftp_packet *pktin, struct sftp_request *req,
char *buffer, int len);
/*
* Write to a file.
*/
struct sftp_request *fxp_write_send(struct fxp_handle *handle,
void *buffer, uint64_t offset, int len);
bool fxp_write_recv(struct sftp_packet *pktin, struct sftp_request *req);
/*
* Read from a directory.
*/
struct sftp_request *fxp_readdir_send(struct fxp_handle *handle);
struct fxp_names *fxp_readdir_recv(struct sftp_packet *pktin,
struct sftp_request *req);
/*
* Free up an fxp_names structure.
*/
void fxp_free_names(struct fxp_names *names);
/*
* Duplicate and free fxp_name structures.
*/
struct fxp_name *fxp_dup_name(struct fxp_name *name);
void fxp_free_name(struct fxp_name *name);
/*
* Store user data in an sftp_request structure.
*/
void *fxp_get_userdata(struct sftp_request *req);
void fxp_set_userdata(struct sftp_request *req, void *data);
/*
* These functions might well be temporary placeholders to be
* replaced with more useful similar functions later. They form the
* main dispatch loop for processing incoming SFTP responses.
*/
void sftp_register(struct sftp_request *req);
struct sftp_request *sftp_find_request(struct sftp_packet *pktin);
struct sftp_packet *sftp_recv(void);
/*
* A wrapper to go round fxp_read_* and fxp_write_*, which manages
* the queueing of multiple read/write requests.
*/
struct fxp_xfer;
struct fxp_xfer *xfer_download_init(struct fxp_handle *fh, uint64_t offset);
void xfer_download_queue(struct fxp_xfer *xfer);
int xfer_download_gotpkt(struct fxp_xfer *xfer, struct sftp_packet *pktin);
bool xfer_download_data(struct fxp_xfer *xfer, void **buf, int *len);
struct fxp_xfer *xfer_upload_init(struct fxp_handle *fh, uint64_t offset);
bool xfer_upload_ready(struct fxp_xfer *xfer);
void xfer_upload_data(struct fxp_xfer *xfer, char *buffer, int len);
int xfer_upload_gotpkt(struct fxp_xfer *xfer, struct sftp_packet *pktin);
bool xfer_done(struct fxp_xfer *xfer);
void xfer_set_error(struct fxp_xfer *xfer);
void xfer_cleanup(struct fxp_xfer *xfer);
/*
* Vtable for the platform-specific filesystem implementation that
* answers requests in an SFTP server.
*/
typedef struct SftpReplyBuilder SftpReplyBuilder;
struct SftpServer {
const SftpServerVtable *vt;
};
struct SftpServerVtable {
SftpServer *(*new)(const SftpServerVtable *vt);
void (*free)(SftpServer *srv);
/*
* Handle actual filesystem requests.
*
* Each of these functions replies by calling an appropiate
* sftp_reply_foo() function on the given reply packet.
*/
/* Should call fxp_reply_error or fxp_reply_simple_name */
void (*realpath)(SftpServer *srv, SftpReplyBuilder *reply,
ptrlen path);
/* Should call fxp_reply_error or fxp_reply_handle */
void (*open)(SftpServer *srv, SftpReplyBuilder *reply,
ptrlen path, unsigned flags, struct fxp_attrs attrs);
/* Should call fxp_reply_error or fxp_reply_handle */
void (*opendir)(SftpServer *srv, SftpReplyBuilder *reply,
ptrlen path);
/* Should call fxp_reply_error or fxp_reply_ok */
void (*close)(SftpServer *srv, SftpReplyBuilder *reply, ptrlen handle);
/* Should call fxp_reply_error or fxp_reply_ok */
void (*mkdir)(SftpServer *srv, SftpReplyBuilder *reply,
ptrlen path, struct fxp_attrs attrs);
/* Should call fxp_reply_error or fxp_reply_ok */
void (*rmdir)(SftpServer *srv, SftpReplyBuilder *reply, ptrlen path);
/* Should call fxp_reply_error or fxp_reply_ok */
void (*remove)(SftpServer *srv, SftpReplyBuilder *reply, ptrlen path);
/* Should call fxp_reply_error or fxp_reply_ok */
void (*rename)(SftpServer *srv, SftpReplyBuilder *reply,
ptrlen srcpath, ptrlen dstpath);
/* Should call fxp_reply_error or fxp_reply_attrs */
void (*stat)(SftpServer *srv, SftpReplyBuilder *reply, ptrlen path,
bool follow_symlinks);
/* Should call fxp_reply_error or fxp_reply_attrs */
void (*fstat)(SftpServer *srv, SftpReplyBuilder *reply, ptrlen handle);
/* Should call fxp_reply_error or fxp_reply_ok */
void (*setstat)(SftpServer *srv, SftpReplyBuilder *reply,
ptrlen path, struct fxp_attrs attrs);
/* Should call fxp_reply_error or fxp_reply_ok */
void (*fsetstat)(SftpServer *srv, SftpReplyBuilder *reply,
ptrlen handle, struct fxp_attrs attrs);
/* Should call fxp_reply_error or fxp_reply_data */
void (*read)(SftpServer *srv, SftpReplyBuilder *reply,
ptrlen handle, uint64_t offset, unsigned length);
/* Should call fxp_reply_error or fxp_reply_ok */
void (*write)(SftpServer *srv, SftpReplyBuilder *reply,
ptrlen handle, uint64_t offset, ptrlen data);
/* Should call fxp_reply_error, or fxp_reply_name_count once and
* then fxp_reply_full_name that many times */
void (*readdir)(SftpServer *srv, SftpReplyBuilder *reply, ptrlen handle,
int max_entries, bool omit_longname);
};
static inline SftpServer *sftpsrv_new(const SftpServerVtable *vt)
{ return vt->new(vt); }
static inline void sftpsrv_free(SftpServer *srv)
{ srv->vt->free(srv); }
static inline void sftpsrv_realpath(SftpServer *srv, SftpReplyBuilder *reply,
ptrlen path)
{ srv->vt->realpath(srv, reply, path); }
static inline void sftpsrv_open(
SftpServer *srv, SftpReplyBuilder *reply,
ptrlen path, unsigned flags, struct fxp_attrs attrs)
{ srv->vt->open(srv, reply, path, flags, attrs); }
static inline void sftpsrv_opendir(
SftpServer *srv, SftpReplyBuilder *reply, ptrlen path)
{ srv->vt->opendir(srv, reply, path); }
static inline void sftpsrv_close(
SftpServer *srv, SftpReplyBuilder *reply, ptrlen handle)
{ srv->vt->close(srv, reply, handle); }
static inline void sftpsrv_mkdir(SftpServer *srv, SftpReplyBuilder *reply,
ptrlen path, struct fxp_attrs attrs)
{ srv->vt->mkdir(srv, reply, path, attrs); }
static inline void sftpsrv_rmdir(
SftpServer *srv, SftpReplyBuilder *reply, ptrlen path)
{ srv->vt->rmdir(srv, reply, path); }
static inline void sftpsrv_remove(
SftpServer *srv, SftpReplyBuilder *reply, ptrlen path)
{ srv->vt->remove(srv, reply, path); }
static inline void sftpsrv_rename(SftpServer *srv, SftpReplyBuilder *reply,
ptrlen srcpath, ptrlen dstpath)
{ srv->vt->rename(srv, reply, srcpath, dstpath); }
static inline void sftpsrv_stat(
SftpServer *srv, SftpReplyBuilder *reply, ptrlen path, bool follow)
{ srv->vt->stat(srv, reply, path, follow); }
static inline void sftpsrv_fstat(
SftpServer *srv, SftpReplyBuilder *reply, ptrlen handle)
{ srv->vt->fstat(srv, reply, handle); }
static inline void sftpsrv_setstat(SftpServer *srv, SftpReplyBuilder *reply,
ptrlen path, struct fxp_attrs attrs)
{ srv->vt->setstat(srv, reply, path, attrs); }
static inline void sftpsrv_fsetstat(SftpServer *srv, SftpReplyBuilder *reply,
ptrlen handle, struct fxp_attrs attrs)
{ srv->vt->fsetstat(srv, reply, handle, attrs); }
static inline void sftpsrv_read(
SftpServer *srv, SftpReplyBuilder *reply,
ptrlen handle, uint64_t offset, unsigned length)
{ srv->vt->read(srv, reply, handle, offset, length); }
static inline void sftpsrv_write(SftpServer *srv, SftpReplyBuilder *reply,
ptrlen handle, uint64_t offset, ptrlen data)
{ srv->vt->write(srv, reply, handle, offset, data); }
static inline void sftpsrv_readdir(
SftpServer *srv, SftpReplyBuilder *reply, ptrlen handle,
int max_entries, bool omit_longname)
{ srv->vt->readdir(srv, reply, handle, max_entries, omit_longname); }
typedef struct SftpReplyBuilderVtable SftpReplyBuilderVtable;
struct SftpReplyBuilder {
const SftpReplyBuilderVtable *vt;
};
struct SftpReplyBuilderVtable {
void (*reply_ok)(SftpReplyBuilder *reply);
void (*reply_error)(SftpReplyBuilder *reply, unsigned code,
const char *msg);
void (*reply_simple_name)(SftpReplyBuilder *reply, ptrlen name);
void (*reply_name_count)(SftpReplyBuilder *reply, unsigned count);
void (*reply_full_name)(SftpReplyBuilder *reply, ptrlen name,
ptrlen longname, struct fxp_attrs attrs);
void (*reply_handle)(SftpReplyBuilder *reply, ptrlen handle);
void (*reply_data)(SftpReplyBuilder *reply, ptrlen data);
void (*reply_attrs)(SftpReplyBuilder *reply, struct fxp_attrs attrs);
};
static inline void fxp_reply_ok(SftpReplyBuilder *reply)
{ reply->vt->reply_ok(reply); }
static inline void fxp_reply_error(SftpReplyBuilder *reply, unsigned code,
const char *msg)
{ reply->vt->reply_error(reply, code, msg); }
static inline void fxp_reply_simple_name(SftpReplyBuilder *reply, ptrlen name)
{ reply->vt->reply_simple_name(reply, name); }
static inline void fxp_reply_name_count(
SftpReplyBuilder *reply, unsigned count)
{ reply->vt->reply_name_count(reply, count); }
static inline void fxp_reply_full_name(SftpReplyBuilder *reply, ptrlen name,
ptrlen longname, struct fxp_attrs attrs)
{ reply->vt->reply_full_name(reply, name, longname, attrs); }
static inline void fxp_reply_handle(SftpReplyBuilder *reply, ptrlen handle)
{ reply->vt->reply_handle(reply, handle); }
static inline void fxp_reply_data(SftpReplyBuilder *reply, ptrlen data)
{ reply->vt->reply_data(reply, data); }
static inline void fxp_reply_attrs(
SftpReplyBuilder *reply, struct fxp_attrs attrs)
{ reply->vt->reply_attrs(reply, attrs); }
/*
* The usual implementation of an SftpReplyBuilder, containing a
* 'struct sftp_packet' which is assumed to be already initialised
* before one of the above request methods is called.
*/
extern const struct SftpReplyBuilderVtable DefaultSftpReplyBuilder_vt;
typedef struct DefaultSftpReplyBuilder DefaultSftpReplyBuilder;
struct DefaultSftpReplyBuilder {
SftpReplyBuilder rb;
struct sftp_packet *pkt;
};
/*
* The top-level function that handles an SFTP request, given an
* implementation of the above SftpServer abstraction to do the actual
* filesystem work. It handles all the marshalling and unmarshalling
* of packets, and the copying of request ids into the responses.
*/
struct sftp_packet *sftp_handle_request(
SftpServer *srv, struct sftp_packet *request);
/* ----------------------------------------------------------------------
* Not exactly SFTP-related, but here's a system that implements an
* old-fashioned SCP server module, given an SftpServer vtable to use
* as its underlying filesystem access.
*/
typedef struct ScpServer ScpServer;
typedef struct ScpServerVtable ScpServerVtable;
struct ScpServer {
const struct ScpServerVtable *vt;
};
struct ScpServerVtable {
void (*free)(ScpServer *s);
size_t (*send)(ScpServer *s, const void *data, size_t length);
void (*throttle)(ScpServer *s, bool throttled);
void (*eof)(ScpServer *s);
};
static inline void scp_free(ScpServer *s)
{ s->vt->free(s); }
static inline size_t scp_send(ScpServer *s, const void *data, size_t length)
{ return s->vt->send(s, data, length); }
static inline void scp_throttle(ScpServer *s, bool throttled)
{ s->vt->throttle(s, throttled); }
static inline void scp_eof(ScpServer *s)
{ s->vt->eof(s); }
/*
* Create an ScpServer by calling this function, giving it the command
* you received from the SSH client to execute. If that command is
* recognised as an scp command, it will construct an ScpServer object
* and return it; otherwise, it will return NULL, and you should
* execute the command in whatever way you normally would.
*
* The ScpServer will generate output for the client by writing it to
* the provided SshChannel using sshfwd_write; you pass it input using
* the send method in its own vtable.
*/
ScpServer *scp_recognise_exec(
SshChannel *sc, const SftpServerVtable *sftpserver_vt, ptrlen command);
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