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int savedpos;
int type;
};
/* ----------------------------------------------------------------------
* SFTP packet construction functions.
*/
static void sftp_pkt_ensure(struct sftp_packet *pkt, int length) {
static void sftp_pkt_ensure(struct sftp_packet *pkt, int length)
{
if (pkt->maxlen < length) {
pkt->maxlen = length + 256;
static void sftp_pkt_adddata(struct sftp_packet *pkt, void *data, int len) {
static void sftp_pkt_adddata(struct sftp_packet *pkt, void *data, int len)
{
pkt->length += len;
sftp_pkt_ensure(pkt, pkt->length);
memcpy(pkt->data+pkt->length-len, data, len);
memcpy(pkt->data + pkt->length - len, data, len);
}
static void sftp_pkt_addbyte(struct sftp_packet *pkt, unsigned char byte) {
static void sftp_pkt_addbyte(struct sftp_packet *pkt, unsigned char byte)
{
sftp_pkt_adddata(pkt, &byte, 1);
}
static struct sftp_packet *sftp_pkt_init(int pkt_type) {
static struct sftp_packet *sftp_pkt_init(int pkt_type)
{
struct sftp_packet *pkt;
pkt = smalloc(sizeof(struct sftp_packet));
pkt->data = NULL;
pkt->savedpos = -1;
pkt->length = 0;
pkt->maxlen = 0;
sftp_pkt_addbyte(pkt, (unsigned char)pkt_type);
sftp_pkt_addbyte(pkt, (unsigned char) pkt_type);
return pkt;
}
static void sftp_pkt_addbool(struct sftp_packet *pkt, unsigned char value) {
static void sftp_pkt_addbool(struct sftp_packet *pkt, unsigned char value)
{
sftp_pkt_adddata(pkt, &value, 1);
}
static void sftp_pkt_adduint32(struct sftp_packet *pkt, unsigned long value) {
static void sftp_pkt_adduint32(struct sftp_packet *pkt,
unsigned long value)
{
unsigned char x[4];
PUT_32BIT(x, value);
sftp_pkt_adddata(pkt, x, 4);
}
static void sftp_pkt_adduint64(struct sftp_packet *pkt, uint64 value) {
static void sftp_pkt_adduint64(struct sftp_packet *pkt, uint64 value)
{
unsigned char x[8];
PUT_32BIT(x, value.hi);
PUT_32BIT(x+4, value.lo);
PUT_32BIT(x + 4, value.lo);
sftp_pkt_adddata(pkt, x, 8);
}
static void sftp_pkt_addstring_start(struct sftp_packet *pkt) {
static void sftp_pkt_addstring_start(struct sftp_packet *pkt)
{
sftp_pkt_adduint32(pkt, 0);
pkt->savedpos = pkt->length;
}
static void sftp_pkt_addstring_str(struct sftp_packet *pkt, char *data) {
static void sftp_pkt_addstring_str(struct sftp_packet *pkt, char *data)
{
sftp_pkt_adddata(pkt, data, strlen(data));
PUT_32BIT(pkt->data + pkt->savedpos - 4,
PUT_32BIT(pkt->data + pkt->savedpos - 4, pkt->length - pkt->savedpos);
pkt->length - pkt->savedpos);
char *data, int len) {
char *data, int len)
{
sftp_pkt_adddata(pkt, data, len);
PUT_32BIT(pkt->data + pkt->savedpos - 4,
PUT_32BIT(pkt->data + pkt->savedpos - 4, pkt->length - pkt->savedpos);
pkt->length - pkt->savedpos);
static void sftp_pkt_addstring(struct sftp_packet *pkt, char *data) {
static void sftp_pkt_addstring(struct sftp_packet *pkt, char *data)
{
sftp_pkt_addstring_start(pkt);
sftp_pkt_addstring_str(pkt, data);
}
/* ----------------------------------------------------------------------
* SFTP packet decode functions.
*/
static unsigned char sftp_pkt_getbyte(struct sftp_packet *pkt) {
static unsigned char sftp_pkt_getbyte(struct sftp_packet *pkt)
{
unsigned char value;
if (pkt->length - pkt->savedpos < 1)
return 0; /* arrgh, no way to decline (FIXME?) */
static unsigned long sftp_pkt_getuint32(struct sftp_packet *pkt) {
static unsigned long sftp_pkt_getuint32(struct sftp_packet *pkt)
{
unsigned long value;
if (pkt->length - pkt->savedpos < 4)
return 0; /* arrgh, no way to decline (FIXME?) */
value = GET_32BIT(pkt->data+pkt->savedpos);
char **p, int *length) {
char **p, int *length)
{
*p = NULL;
if (pkt->length - pkt->savedpos < 4)
return;
*length = GET_32BIT(pkt->data+pkt->savedpos);
return;
*p = pkt->data+pkt->savedpos;
static struct fxp_attrs sftp_pkt_getattrs(struct sftp_packet *pkt) {
static struct fxp_attrs sftp_pkt_getattrs(struct sftp_packet *pkt)
{
struct fxp_attrs ret;
ret.flags = sftp_pkt_getuint32(pkt);
if (ret.flags & SSH_FILEXFER_ATTR_SIZE) {
unsigned long hi, lo;
hi = sftp_pkt_getuint32(pkt);
lo = sftp_pkt_getuint32(pkt);
ret.size = uint64_make(hi, lo);
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*/
sftp_pkt_getstring(pkt, &str, &len);
sftp_pkt_getstring(pkt, &str, &len);
}
}
return ret;
}
static void sftp_pkt_free(struct sftp_packet *pkt) {
if (pkt->data) sfree(pkt->data);
static void sftp_pkt_free(struct sftp_packet *pkt)
{
if (pkt->data)
sfree(pkt->data);
sfree(pkt);
}
/* ----------------------------------------------------------------------
* Send and receive packet functions.
*/
int sftp_send(struct sftp_packet *pkt) {
int sftp_send(struct sftp_packet *pkt)
{
int ret;
char x[4];
PUT_32BIT(x, pkt->length);
ret = (sftp_senddata(x, 4) &&
ret = (sftp_senddata(x, 4) && sftp_senddata(pkt->data, pkt->length));
sftp_senddata(pkt->data, pkt->length));
struct sftp_packet *sftp_recv(void) {
struct sftp_packet *sftp_recv(void)
{
struct sftp_packet *pkt;
char x[4];
if (!sftp_recvdata(x, 4))
return NULL;
pkt = smalloc(sizeof(struct sftp_packet));
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return pkt;
}
/* ----------------------------------------------------------------------
* String handling routines.
*/
static char *mkstr(char *s, int len) {
char *p = smalloc(len+1);
static char *mkstr(char *s, int len)
{
char *p = smalloc(len + 1);
memcpy(p, s, len);
p[len] = '\0';
return p;
}
/* ----------------------------------------------------------------------
* SFTP primitives.
*/
static const char *fxp_error_message;
static int fxp_errtype;
/*
* Deal with (and free) an FXP_STATUS packet. Return 1 if
* SSH_FX_OK, 0 if SSH_FX_EOF, and -1 for anything else (error).
* Also place the status into fxp_errtype.
*/
static int fxp_got_status(struct sftp_packet *pktin) {
static int fxp_got_status(struct sftp_packet *pktin)
{
static const char *const messages[] = {
/* SSH_FX_OK. The only time we will display a _message_ for this
* is if we were expecting something other than FXP_STATUS on
* success, so this is actually an error message! */
"unexpected OK response",
"end of file",
"no such file or directory",
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if (pktin->type != SSH_FXP_STATUS) {
fxp_error_message = "expected FXP_STATUS packet";
fxp_errtype = -1;
} else {
fxp_errtype = sftp_pkt_getuint32(pktin);
if (fxp_errtype < 0 ||
fxp_errtype >= sizeof(messages)/sizeof(*messages))
fxp_error_message = "unknown error code";
fxp_errtype >= sizeof(messages) / sizeof(*messages))
fxp_error_message = "unknown error code";
else
fxp_error_message = messages[fxp_errtype];
}
if (fxp_errtype == SSH_FX_OK)
return 1;
else if (fxp_errtype == SSH_FX_EOF)
return 0;
else
return -1;
}
static void fxp_internal_error(char *msg) {
static void fxp_internal_error(char *msg)
{
fxp_error_message = msg;
fxp_errtype = -1;
}
const char *fxp_error(void) {
const char *fxp_error(void)
{
return fxp_error_message;
}
int fxp_error_type(void) {
int fxp_error_type(void)
{
return fxp_errtype;
}
/*
* Perform exchange of init/version packets. Return 0 on failure.
*/
int fxp_init(void) {
int fxp_init(void)
{
struct sftp_packet *pktout, *pktin;
int remotever;
pktout = sftp_pkt_init(SSH_FXP_INIT);
sftp_pkt_adduint32(pktout, SFTP_PROTO_VERSION);
sftp_send(pktout);
pktin = sftp_recv();
if (!pktin) {
fxp_internal_error("could not connect");
return 0;
}
if (pktin->type != SSH_FXP_VERSION) {
fxp_internal_error("did not receive FXP_VERSION");
return 0;
}
remotever = sftp_pkt_getuint32(pktin);
if (remotever > SFTP_PROTO_VERSION) {
fxp_internal_error
fxp_internal_error("remote protocol is more advanced than we support");
("remote protocol is more advanced than we support");
return 0;
}
/*
* In principle, this packet might also contain extension-
* string pairs. We should work through them and look for any
* we recognise. In practice we don't currently do so because
* we know we don't recognise _any_.
*/
sftp_pkt_free(pktin);
return 1;
}
/*
* Canonify a pathname.
*/
char *fxp_realpath(char *path) {
char *fxp_realpath(char *path)
{
struct sftp_packet *pktin, *pktout;
int id;
pktout = sftp_pkt_init(SSH_FXP_REALPATH);
sftp_pkt_adduint32(pktout, 0x123); /* request id */
sftp_pkt_addstring_start(pktout);
sftp_pkt_addstring_str(pktout, path);
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return NULL;
}
}
/*
* Open a file.
*/
struct fxp_handle *fxp_open(char *path, int type) {
struct fxp_handle *fxp_open(char *path, int type)
{
struct sftp_packet *pktin, *pktout;
int id;
pktout = sftp_pkt_init(SSH_FXP_OPEN);
sftp_pkt_adduint32(pktout, 0x567); /* request id */
sftp_pkt_addstring(pktout, path);
sftp_pkt_adduint32(pktout, type);
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return NULL;
}
}
/*
* Open a directory.
*/
struct fxp_handle *fxp_opendir(char *path) {
struct fxp_handle *fxp_opendir(char *path)
{
struct sftp_packet *pktin, *pktout;
int id;
pktout = sftp_pkt_init(SSH_FXP_OPENDIR);
sftp_pkt_adduint32(pktout, 0x456); /* request id */
sftp_pkt_addstring(pktout, path);
sftp_send(pktout);
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return NULL;
}
}
/*
* Close a file/dir.
*/
void fxp_close(struct fxp_handle *handle) {
void fxp_close(struct fxp_handle *handle)
{
struct sftp_packet *pktin, *pktout;
int id;
pktout = sftp_pkt_init(SSH_FXP_CLOSE);
sftp_pkt_adduint32(pktout, 0x789); /* request id */
sftp_pkt_addstring_start(pktout);
sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen);
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/*
* Read from a file. Returns the number of bytes read, or -1 on an
* error, or possibly 0 if EOF. (I'm not entirely sure whether it
* will return 0 on EOF, or return -1 and store SSH_FX_EOF in the
* error indicator. It might even depend on the SFTP server.)
*/
int fxp_read(struct fxp_handle *handle, char *buffer, uint64 offset, int len) {
int fxp_read(struct fxp_handle *handle, char *buffer, uint64 offset,
int len)
{
struct sftp_packet *pktin, *pktout;
int id;
pktout = sftp_pkt_init(SSH_FXP_READ);
sftp_pkt_adduint32(pktout, 0xBCD); /* request id */
sftp_pkt_addstring_start(pktout);
sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen);
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return -1;
}
}
/*
* Read from a directory.
*/
struct fxp_names *fxp_readdir(struct fxp_handle *handle) {
struct fxp_names *fxp_readdir(struct fxp_handle *handle)
{
struct sftp_packet *pktin, *pktout;
int id;
pktout = sftp_pkt_init(SSH_FXP_READDIR);
sftp_pkt_adduint32(pktout, 0xABC); /* request id */
sftp_pkt_addstring_start(pktout);
sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen);
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return NULL;
}
}
/*
* Write to a file. Returns 0 on error, 1 on OK.
*/
int fxp_write(struct fxp_handle *handle, char *buffer, uint64 offset, int len) {
int fxp_write(struct fxp_handle *handle, char *buffer, uint64 offset,
int len)
{
struct sftp_packet *pktin, *pktout;
int id;
pktout = sftp_pkt_init(SSH_FXP_WRITE);
sftp_pkt_adduint32(pktout, 0xDCB); /* request id */
sftp_pkt_addstring_start(pktout);
sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen);
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fxp_got_status(pktin);
return fxp_errtype == SSH_FX_OK;
}
/*
* Free up an fxp_names structure.
*/
void fxp_free_names(struct fxp_names *names) {
void fxp_free_names(struct fxp_names *names)
{
int i;
for (i = 0; i < names->nnames; i++) {
sfree(names->names[i].filename);
sfree(names->names[i].longname);
}
sfree(names->names);
sfree(names);
}
|