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30e491e5c9
curl/lib/vssh/wolfssh.c
Daniel Stenberg 0c55fbab45
conn: add 'attach' to protocol handler, make libssh2 use it 
The libssh2 backend has SSH session associated with the connection but
the callback context is the easy handle, so when a connection gets
attached to a transfer, the protocol handler now allows for a custom
function to get used to set things up correctly.

Reported-by: Michael O'Farrell
Fixes #6898
Closes #7078
2021-05-17 17:57:50 +02:00

1170 lines
34 KiB
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2019 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#ifdef USE_WOLFSSH
#include <limits.h>
#include <wolfssh/ssh.h>
#include <wolfssh/wolfsftp.h>
#include "urldata.h"
#include "connect.h"
#include "sendf.h"
#include "progress.h"
#include "curl_path.h"
#include "strtoofft.h"
#include "transfer.h"
#include "speedcheck.h"
#include "select.h"
#include "multiif.h"
#include "warnless.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
static CURLcode wssh_connect(struct Curl_easy *data, bool *done);
static CURLcode wssh_multi_statemach(struct Curl_easy *data, bool *done);
static CURLcode wssh_do(struct Curl_easy *data, bool *done);
#if 0
static CURLcode wscp_done(struct Curl_easy *data,
CURLcode, bool premature);
static CURLcode wscp_doing(struct Curl_easy *data,
bool *dophase_done);
static CURLcode wscp_disconnect(struct Curl_easy *data,
struct connectdata *conn,
bool dead_connection);
#endif
static CURLcode wsftp_done(struct Curl_easy *data,
CURLcode, bool premature);
static CURLcode wsftp_doing(struct Curl_easy *data,
bool *dophase_done);
static CURLcode wsftp_disconnect(struct Curl_easy *data,
struct connectdata *conn,
bool dead);
static int wssh_getsock(struct Curl_easy *data,
struct connectdata *conn,
curl_socket_t *sock);
static CURLcode wssh_setup_connection(struct Curl_easy *data,
struct connectdata *conn);
#if 0
/*
* SCP protocol handler.
*/
const struct Curl_handler Curl_handler_scp = {
"SCP", /* scheme */
wssh_setup_connection, /* setup_connection */
wssh_do, /* do_it */
wscp_done, /* done */
ZERO_NULL, /* do_more */
wssh_connect, /* connect_it */
wssh_multi_statemach, /* connecting */
wscp_doing, /* doing */
wssh_getsock, /* proto_getsock */
wssh_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
wssh_getsock, /* perform_getsock */
wscp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
ZERO_NULL, /* attach connection */
PORT_SSH, /* defport */
CURLPROTO_SCP, /* protocol */
PROTOPT_DIRLOCK | PROTOPT_CLOSEACTION
| PROTOPT_NOURLQUERY /* flags */
};
#endif
/*
* SFTP protocol handler.
*/
const struct Curl_handler Curl_handler_sftp = {
"SFTP", /* scheme */
wssh_setup_connection, /* setup_connection */
wssh_do, /* do_it */
wsftp_done, /* done */
ZERO_NULL, /* do_more */
wssh_connect, /* connect_it */
wssh_multi_statemach, /* connecting */
wsftp_doing, /* doing */
wssh_getsock, /* proto_getsock */
wssh_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
wssh_getsock, /* perform_getsock */
wsftp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
ZERO_NULL, /* attach connection */
PORT_SSH, /* defport */
CURLPROTO_SFTP, /* protocol */
CURLPROTO_SFTP, /* family */
PROTOPT_DIRLOCK | PROTOPT_CLOSEACTION
| PROTOPT_NOURLQUERY /* flags */
};
/*
* SSH State machine related code
*/
/* This is the ONLY way to change SSH state! */
static void state(struct Curl_easy *data, sshstate nowstate)
{
struct connectdata *conn = data->conn;
struct ssh_conn *sshc = &conn->proto.sshc;
#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
/* for debug purposes */
static const char * const names[] = {
"SSH_STOP",
"SSH_INIT",
"SSH_S_STARTUP",
"SSH_HOSTKEY",
"SSH_AUTHLIST",
"SSH_AUTH_PKEY_INIT",
"SSH_AUTH_PKEY",
"SSH_AUTH_PASS_INIT",
"SSH_AUTH_PASS",
"SSH_AUTH_AGENT_INIT",
"SSH_AUTH_AGENT_LIST",
"SSH_AUTH_AGENT",
"SSH_AUTH_HOST_INIT",
"SSH_AUTH_HOST",
"SSH_AUTH_KEY_INIT",
"SSH_AUTH_KEY",
"SSH_AUTH_GSSAPI",
"SSH_AUTH_DONE",
"SSH_SFTP_INIT",
"SSH_SFTP_REALPATH",
"SSH_SFTP_QUOTE_INIT",
"SSH_SFTP_POSTQUOTE_INIT",
"SSH_SFTP_QUOTE",
"SSH_SFTP_NEXT_QUOTE",
"SSH_SFTP_QUOTE_STAT",
"SSH_SFTP_QUOTE_SETSTAT",
"SSH_SFTP_QUOTE_SYMLINK",
"SSH_SFTP_QUOTE_MKDIR",
"SSH_SFTP_QUOTE_RENAME",
"SSH_SFTP_QUOTE_RMDIR",
"SSH_SFTP_QUOTE_UNLINK",
"SSH_SFTP_QUOTE_STATVFS",
"SSH_SFTP_GETINFO",
"SSH_SFTP_FILETIME",
"SSH_SFTP_TRANS_INIT",
"SSH_SFTP_UPLOAD_INIT",
"SSH_SFTP_CREATE_DIRS_INIT",
"SSH_SFTP_CREATE_DIRS",
"SSH_SFTP_CREATE_DIRS_MKDIR",
"SSH_SFTP_READDIR_INIT",
"SSH_SFTP_READDIR",
"SSH_SFTP_READDIR_LINK",
"SSH_SFTP_READDIR_BOTTOM",
"SSH_SFTP_READDIR_DONE",
"SSH_SFTP_DOWNLOAD_INIT",
"SSH_SFTP_DOWNLOAD_STAT",
"SSH_SFTP_CLOSE",
"SSH_SFTP_SHUTDOWN",
"SSH_SCP_TRANS_INIT",
"SSH_SCP_UPLOAD_INIT",
"SSH_SCP_DOWNLOAD_INIT",
"SSH_SCP_DOWNLOAD",
"SSH_SCP_DONE",
"SSH_SCP_SEND_EOF",
"SSH_SCP_WAIT_EOF",
"SSH_SCP_WAIT_CLOSE",
"SSH_SCP_CHANNEL_FREE",
"SSH_SESSION_DISCONNECT",
"SSH_SESSION_FREE",
"QUIT"
};
/* a precaution to make sure the lists are in sync */
DEBUGASSERT(sizeof(names)/sizeof(names[0]) == SSH_LAST);
if(sshc->state != nowstate) {
infof(data, "wolfssh %p state change from %s to %s\n",
(void *)sshc, names[sshc->state], names[nowstate]);
}
#endif
sshc->state = nowstate;
}
static ssize_t wscp_send(struct Curl_easy *data, int sockindex,
const void *mem, size_t len, CURLcode *err)
{
ssize_t nwrite = 0;
(void)data;
(void)sockindex; /* we only support SCP on the fixed known primary socket */
(void)mem;
(void)len;
(void)err;
return nwrite;
}
static ssize_t wscp_recv(struct Curl_easy *data, int sockindex,
char *mem, size_t len, CURLcode *err)
{
ssize_t nread = 0;
(void)data;
(void)sockindex; /* we only support SCP on the fixed known primary socket */
(void)mem;
(void)len;
(void)err;
return nread;
}
/* return number of sent bytes */
static ssize_t wsftp_send(struct Curl_easy *data, int sockindex,
const void *mem, size_t len, CURLcode *err)
{
struct connectdata *conn = data->conn;
struct ssh_conn *sshc = &conn->proto.sshc;
word32 offset[2];
int rc;
(void)sockindex;
offset[0] = (word32)sshc->offset&0xFFFFFFFF;
offset[1] = (word32)(sshc->offset>>32)&0xFFFFFFFF;
rc = wolfSSH_SFTP_SendWritePacket(sshc->ssh_session, sshc->handle,
sshc->handleSz,
&offset[0],
(byte *)mem, (word32)len);
if(rc == WS_FATAL_ERROR)
rc = wolfSSH_get_error(sshc->ssh_session);
if(rc == WS_WANT_READ) {
conn->waitfor = KEEP_RECV;
*err = CURLE_AGAIN;
return -1;
}
else if(rc == WS_WANT_WRITE) {
conn->waitfor = KEEP_SEND;
*err = CURLE_AGAIN;
return -1;
}
if(rc < 0) {
failf(data, "wolfSSH_SFTP_SendWritePacket returned %d", rc);
return -1;
}
DEBUGASSERT(rc == (int)len);
infof(data, "sent %zd bytes SFTP from offset %zd\n",
len, sshc->offset);
sshc->offset += len;
return (ssize_t)rc;
}
/*
* Return number of received (decrypted) bytes
* or <0 on error
*/
static ssize_t wsftp_recv(struct Curl_easy *data, int sockindex,
char *mem, size_t len, CURLcode *err)
{
int rc;
struct connectdata *conn = data->conn;
struct ssh_conn *sshc = &conn->proto.sshc;
word32 offset[2];
(void)sockindex;
offset[0] = (word32)sshc->offset&0xFFFFFFFF;
offset[1] = (word32)(sshc->offset>>32)&0xFFFFFFFF;
rc = wolfSSH_SFTP_SendReadPacket(sshc->ssh_session, sshc->handle,
sshc->handleSz,
&offset[0],
(byte *)mem, (word32)len);
if(rc == WS_FATAL_ERROR)
rc = wolfSSH_get_error(sshc->ssh_session);
if(rc == WS_WANT_READ) {
conn->waitfor = KEEP_RECV;
*err = CURLE_AGAIN;
return -1;
}
else if(rc == WS_WANT_WRITE) {
conn->waitfor = KEEP_SEND;
*err = CURLE_AGAIN;
return -1;
}
DEBUGASSERT(rc <= (int)len);
if(rc < 0) {
failf(data, "wolfSSH_SFTP_SendReadPacket returned %d", rc);
return -1;
}
sshc->offset += len;
return (ssize_t)rc;
}
/*
* SSH setup and connection
*/
static CURLcode wssh_setup_connection(struct Curl_easy *data,
struct connectdata *conn)
{
struct SSHPROTO *ssh;
(void)conn;
data->req.p.ssh = ssh = calloc(1, sizeof(struct SSHPROTO));
if(!ssh)
return CURLE_OUT_OF_MEMORY;
return CURLE_OK;
}
static Curl_recv wscp_recv, wsftp_recv;
static Curl_send wscp_send, wsftp_send;
static int userauth(byte authtype,
WS_UserAuthData* authdata,
void *ctx)
{
struct Curl_easy *data = ctx;
DEBUGF(infof(data, "wolfssh callback: type %s\n",
authtype == WOLFSSH_USERAUTH_PASSWORD ? "PASSWORD" :
"PUBLICCKEY"));
if(authtype == WOLFSSH_USERAUTH_PASSWORD) {
authdata->sf.password.password = (byte *)data->conn->passwd;
authdata->sf.password.passwordSz = (word32) strlen(data->conn->passwd);
}
return 0;
}
static CURLcode wssh_connect(struct Curl_easy *data, bool *done)
{
struct connectdata *conn = data->conn;
struct ssh_conn *sshc;
curl_socket_t sock = conn->sock[FIRSTSOCKET];
int rc;
/* initialize per-handle data if not already */
if(!data->req.p.ssh)
wssh_setup_connection(data, conn);
/* We default to persistent connections. We set this already in this connect
function to make the re-use checks properly be able to check this bit. */
connkeep(conn, "SSH default");
if(conn->handler->protocol & CURLPROTO_SCP) {
conn->recv[FIRSTSOCKET] = wscp_recv;
conn->send[FIRSTSOCKET] = wscp_send;
}
else {
conn->recv[FIRSTSOCKET] = wsftp_recv;
conn->send[FIRSTSOCKET] = wsftp_send;
}
sshc = &conn->proto.sshc;
sshc->ctx = wolfSSH_CTX_new(WOLFSSH_ENDPOINT_CLIENT, NULL);
if(!sshc->ctx) {
failf(data, "No wolfSSH context");
goto error;
}
sshc->ssh_session = wolfSSH_new(sshc->ctx);
if(!sshc->ssh_session) {
failf(data, "No wolfSSH session");
goto error;
}
rc = wolfSSH_SetUsername(sshc->ssh_session, conn->user);
if(rc != WS_SUCCESS) {
failf(data, "wolfSSH failed to set user name");
goto error;
}
/* set callback for authentication */
wolfSSH_SetUserAuth(sshc->ctx, userauth);
wolfSSH_SetUserAuthCtx(sshc->ssh_session, data);
rc = wolfSSH_set_fd(sshc->ssh_session, (int)sock);
if(rc) {
failf(data, "wolfSSH failed to set socket");
goto error;
}
#if 0
wolfSSH_Debugging_ON();
#endif
*done = TRUE;
if(conn->handler->protocol & CURLPROTO_SCP)
state(data, SSH_INIT);
else
state(data, SSH_SFTP_INIT);
return wssh_multi_statemach(data, done);
error:
wolfSSH_free(sshc->ssh_session);
wolfSSH_CTX_free(sshc->ctx);
return CURLE_FAILED_INIT;
}
/*
* wssh_statemach_act() runs the SSH state machine as far as it can without
* blocking and without reaching the end. The data the pointer 'block' points
* to will be set to TRUE if the wolfssh function returns EAGAIN meaning it
* wants to be called again when the socket is ready
*/
static CURLcode wssh_statemach_act(struct Curl_easy *data, bool *block)
{
CURLcode result = CURLE_OK;
struct connectdata *conn = data->conn;
struct ssh_conn *sshc = &conn->proto.sshc;
struct SSHPROTO *sftp_scp = data->req.p.ssh;
WS_SFTPNAME *name;
int rc = 0;
*block = FALSE; /* we're not blocking by default */
do {
switch(sshc->state) {
case SSH_INIT:
state(data, SSH_S_STARTUP);
/* FALLTHROUGH */
case SSH_S_STARTUP:
rc = wolfSSH_connect(sshc->ssh_session);
if(rc != WS_SUCCESS)
rc = wolfSSH_get_error(sshc->ssh_session);
if(rc == WS_WANT_READ) {
*block = TRUE;
conn->waitfor = KEEP_RECV;
return CURLE_OK;
}
else if(rc == WS_WANT_WRITE) {
*block = TRUE;
conn->waitfor = KEEP_SEND;
return CURLE_OK;
}
else if(rc != WS_SUCCESS) {
state(data, SSH_STOP);
return CURLE_SSH;
}
infof(data, "wolfssh connected!\n");
state(data, SSH_STOP);
break;
case SSH_STOP:
break;
case SSH_SFTP_INIT:
rc = wolfSSH_SFTP_connect(sshc->ssh_session);
if(rc != WS_SUCCESS)
rc = wolfSSH_get_error(sshc->ssh_session);
if(rc == WS_WANT_READ) {
*block = TRUE;
conn->waitfor = KEEP_RECV;
return CURLE_OK;
}
else if(rc == WS_WANT_WRITE) {
*block = TRUE;
conn->waitfor = KEEP_SEND;
return CURLE_OK;
}
else if(rc == WS_SUCCESS) {
infof(data, "wolfssh SFTP connected!\n");
state(data, SSH_SFTP_REALPATH);
}
else {
failf(data, "wolfssh SFTP connect error %d", rc);
return CURLE_SSH;
}
break;
case SSH_SFTP_REALPATH:
name = wolfSSH_SFTP_RealPath(sshc->ssh_session, (char *)".");
rc = wolfSSH_get_error(sshc->ssh_session);
if(rc == WS_WANT_READ) {
*block = TRUE;
conn->waitfor = KEEP_RECV;
return CURLE_OK;
}
else if(rc == WS_WANT_WRITE) {
*block = TRUE;
conn->waitfor = KEEP_SEND;
return CURLE_OK;
}
else if(name && (rc == WS_SUCCESS)) {
sshc->homedir = malloc(name->fSz + 1);
if(!sshc->homedir) {
sshc->actualcode = CURLE_OUT_OF_MEMORY;
}
else {
memcpy(sshc->homedir, name->fName, name->fSz);
sshc->homedir[name->fSz] = 0;
infof(data, "wolfssh SFTP realpath succeeded!\n");
}
wolfSSH_SFTPNAME_list_free(name);
state(data, SSH_STOP);
return CURLE_OK;
}
failf(data, "wolfssh SFTP realpath %d", rc);
return CURLE_SSH;
case SSH_SFTP_QUOTE_INIT:
result = Curl_getworkingpath(data, sshc->homedir, &sftp_scp->path);
if(result) {
sshc->actualcode = result;
state(data, SSH_STOP);
break;
}
if(data->set.quote) {
infof(data, "Sending quote commands\n");
sshc->quote_item = data->set.quote;
state(data, SSH_SFTP_QUOTE);
}
else {
state(data, SSH_SFTP_GETINFO);
}
break;
case SSH_SFTP_GETINFO:
if(data->set.get_filetime) {
state(data, SSH_SFTP_FILETIME);
}
else {
state(data, SSH_SFTP_TRANS_INIT);
}
break;
case SSH_SFTP_TRANS_INIT:
if(data->set.upload)
state(data, SSH_SFTP_UPLOAD_INIT);
else {
if(sftp_scp->path[strlen(sftp_scp->path)-1] == '/')
state(data, SSH_SFTP_READDIR_INIT);
else
state(data, SSH_SFTP_DOWNLOAD_INIT);
}
break;
case SSH_SFTP_UPLOAD_INIT: {
word32 flags;
WS_SFTP_FILEATRB createattrs;
if(data->state.resume_from) {
WS_SFTP_FILEATRB attrs;
if(data->state.resume_from < 0) {
rc = wolfSSH_SFTP_STAT(sshc->ssh_session, sftp_scp->path,
&attrs);
if(rc != WS_SUCCESS)
break;
if(rc) {
data->state.resume_from = 0;
}
else {
curl_off_t size = ((curl_off_t)attrs.sz[1] << 32) | attrs.sz[0];
if(size < 0) {
failf(data, "Bad file size (%" CURL_FORMAT_CURL_OFF_T ")", size);
return CURLE_BAD_DOWNLOAD_RESUME;
}
data->state.resume_from = size;
}
}
}
if(data->set.remote_append)
/* Try to open for append, but create if nonexisting */
flags = WOLFSSH_FXF_WRITE|WOLFSSH_FXF_CREAT|WOLFSSH_FXF_APPEND;
else if(data->state.resume_from > 0)
/* If we have restart position then open for append */
flags = WOLFSSH_FXF_WRITE|WOLFSSH_FXF_APPEND;
else
/* Clear file before writing (normal behavior) */
flags = WOLFSSH_FXF_WRITE|WOLFSSH_FXF_CREAT|WOLFSSH_FXF_TRUNC;
memset(&createattrs, 0, sizeof(createattrs));
createattrs.per = (word32)data->set.new_file_perms;
sshc->handleSz = sizeof(sshc->handle);
rc = wolfSSH_SFTP_Open(sshc->ssh_session, sftp_scp->path,
flags, &createattrs,
sshc->handle, &sshc->handleSz);
if(rc == WS_FATAL_ERROR)
rc = wolfSSH_get_error(sshc->ssh_session);
if(rc == WS_WANT_READ) {
*block = TRUE;
conn->waitfor = KEEP_RECV;
return CURLE_OK;
}
else if(rc == WS_WANT_WRITE) {
*block = TRUE;
conn->waitfor = KEEP_SEND;
return CURLE_OK;
}
else if(rc == WS_SUCCESS) {
infof(data, "wolfssh SFTP open succeeded!\n");
}
else {
failf(data, "wolfssh SFTP upload open failed: %d", rc);
return CURLE_SSH;
}
state(data, SSH_SFTP_DOWNLOAD_STAT);
/* If we have a restart point then we need to seek to the correct
position. */
if(data->state.resume_from > 0) {
/* Let's read off the proper amount of bytes from the input. */
int seekerr = CURL_SEEKFUNC_OK;
if(conn->seek_func) {
Curl_set_in_callback(data, true);
seekerr = conn->seek_func(conn->seek_client, data->state.resume_from,
SEEK_SET);
Curl_set_in_callback(data, false);
}
if(seekerr != CURL_SEEKFUNC_OK) {
curl_off_t passed = 0;
if(seekerr != CURL_SEEKFUNC_CANTSEEK) {
failf(data, "Could not seek stream");
return CURLE_FTP_COULDNT_USE_REST;
}
/* seekerr == CURL_SEEKFUNC_CANTSEEK (can't seek to offset) */
do {
size_t readthisamountnow =
(data->state.resume_from - passed > data->set.buffer_size) ?
(size_t)data->set.buffer_size :
curlx_sotouz(data->state.resume_from - passed);
size_t actuallyread;
Curl_set_in_callback(data, true);
actuallyread = data->state.fread_func(data->state.buffer, 1,
readthisamountnow,
data->state.in);
Curl_set_in_callback(data, false);
passed += actuallyread;
if((actuallyread == 0) || (actuallyread > readthisamountnow)) {
/* this checks for greater-than only to make sure that the
CURL_READFUNC_ABORT return code still aborts */
failf(data, "Failed to read data");
return CURLE_FTP_COULDNT_USE_REST;
}
} while(passed < data->state.resume_from);
}
/* now, decrease the size of the read */
if(data->state.infilesize > 0) {
data->state.infilesize -= data->state.resume_from;
data->req.size = data->state.infilesize;
Curl_pgrsSetUploadSize(data, data->state.infilesize);
}
sshc->offset += data->state.resume_from;
}
if(data->state.infilesize > 0) {
data->req.size = data->state.infilesize;
Curl_pgrsSetUploadSize(data, data->state.infilesize);
}
/* upload data */
Curl_setup_transfer(data, -1, -1, FALSE, FIRSTSOCKET);
/* not set by Curl_setup_transfer to preserve keepon bits */
conn->sockfd = conn->writesockfd;
if(result) {
state(data, SSH_SFTP_CLOSE);
sshc->actualcode = result;
}
else {
/* store this original bitmask setup to use later on if we can't
figure out a "real" bitmask */
sshc->orig_waitfor = data->req.keepon;
/* we want to use the _sending_ function even when the socket turns
out readable as the underlying libssh2 sftp send function will deal
with both accordingly */
conn->cselect_bits = CURL_CSELECT_OUT;
/* since we don't really wait for anything at this point, we want the
state machine to move on as soon as possible so we set a very short
timeout here */
Curl_expire(data, 0, EXPIRE_RUN_NOW);
state(data, SSH_STOP);
}
break;
}
case SSH_SFTP_DOWNLOAD_INIT:
sshc->handleSz = sizeof(sshc->handle);
rc = wolfSSH_SFTP_Open(sshc->ssh_session, sftp_scp->path,
WOLFSSH_FXF_READ, NULL,
sshc->handle, &sshc->handleSz);
if(rc == WS_FATAL_ERROR)
rc = wolfSSH_get_error(sshc->ssh_session);
if(rc == WS_WANT_READ) {
*block = TRUE;
conn->waitfor = KEEP_RECV;
return CURLE_OK;
}
else if(rc == WS_WANT_WRITE) {
*block = TRUE;
conn->waitfor = KEEP_SEND;
return CURLE_OK;
}
else if(rc == WS_SUCCESS) {
infof(data, "wolfssh SFTP open succeeded!\n");
state(data, SSH_SFTP_DOWNLOAD_STAT);
return CURLE_OK;
}
failf(data, "wolfssh SFTP open failed: %d", rc);
return CURLE_SSH;
case SSH_SFTP_DOWNLOAD_STAT: {
WS_SFTP_FILEATRB attrs;
curl_off_t size;
rc = wolfSSH_SFTP_STAT(sshc->ssh_session, sftp_scp->path, &attrs);
if(rc == WS_FATAL_ERROR)
rc = wolfSSH_get_error(sshc->ssh_session);
if(rc == WS_WANT_READ) {
*block = TRUE;
conn->waitfor = KEEP_RECV;
return CURLE_OK;
}
else if(rc == WS_WANT_WRITE) {
*block = TRUE;
conn->waitfor = KEEP_SEND;
return CURLE_OK;
}
else if(rc == WS_SUCCESS) {
infof(data, "wolfssh STAT succeeded!\n");
}
else {
failf(data, "wolfssh SFTP open failed: %d", rc);
data->req.size = -1;
data->req.maxdownload = -1;
Curl_pgrsSetDownloadSize(data, -1);
return CURLE_SSH;
}
size = ((curl_off_t)attrs.sz[1] <<32) | attrs.sz[0];
data->req.size = size;
data->req.maxdownload = size;
Curl_pgrsSetDownloadSize(data, size);
infof(data, "SFTP download %" CURL_FORMAT_CURL_OFF_T " bytes\n", size);
/* We cannot seek with wolfSSH so resuming and range requests are not
possible */
if(data->state.use_range || data->state.resume_from) {
infof(data, "wolfSSH cannot do range/seek on SFTP\n");
return CURLE_BAD_DOWNLOAD_RESUME;
}
/* Setup the actual download */
if(data->req.size == 0) {
/* no data to transfer */
Curl_setup_transfer(data, -1, -1, FALSE, -1);
infof(data, "File already completely downloaded\n");
state(data, SSH_STOP);
break;
}
Curl_setup_transfer(data, FIRSTSOCKET, data->req.size, FALSE, -1);
/* not set by Curl_setup_transfer to preserve keepon bits */
conn->writesockfd = conn->sockfd;
/* we want to use the _receiving_ function even when the socket turns
out writableable as the underlying libssh2 recv function will deal
with both accordingly */
conn->cselect_bits = CURL_CSELECT_IN;
if(result) {
/* this should never occur; the close state should be entered
at the time the error occurs */
state(data, SSH_SFTP_CLOSE);
sshc->actualcode = result;
}
else {
state(data, SSH_STOP);
}
break;
}
case SSH_SFTP_CLOSE:
if(sshc->handleSz)
rc = wolfSSH_SFTP_Close(sshc->ssh_session, sshc->handle,
sshc->handleSz);
else
rc = WS_SUCCESS; /* directory listing */
if(rc == WS_WANT_READ) {
*block = TRUE;
conn->waitfor = KEEP_RECV;
return CURLE_OK;
}
else if(rc == WS_WANT_WRITE) {
*block = TRUE;
conn->waitfor = KEEP_SEND;
return CURLE_OK;
}
else if(rc == WS_SUCCESS) {
state(data, SSH_STOP);
return CURLE_OK;
}
failf(data, "wolfssh SFTP CLOSE failed: %d", rc);
return CURLE_SSH;
case SSH_SFTP_READDIR_INIT:
Curl_pgrsSetDownloadSize(data, -1);
if(data->set.opt_no_body) {
state(data, SSH_STOP);
break;
}
state(data, SSH_SFTP_READDIR);
/* FALLTHROUGH */
case SSH_SFTP_READDIR:
name = wolfSSH_SFTP_LS(sshc->ssh_session, sftp_scp->path);
if(!name)
rc = wolfSSH_get_error(sshc->ssh_session);
else
rc = WS_SUCCESS;
if(rc == WS_WANT_READ) {
*block = TRUE;
conn->waitfor = KEEP_RECV;
return CURLE_OK;
}
else if(rc == WS_WANT_WRITE) {
*block = TRUE;
conn->waitfor = KEEP_SEND;
return CURLE_OK;
}
else if(name && (rc == WS_SUCCESS)) {
WS_SFTPNAME *origname = name;
result = CURLE_OK;
while(name) {
char *line = aprintf("%s\n",
data->set.list_only ?
name->fName : name->lName);
if(!line) {
state(data, SSH_SFTP_CLOSE);
sshc->actualcode = CURLE_OUT_OF_MEMORY;
break;
}
result = Curl_client_write(data, CLIENTWRITE_BODY,
line, strlen(line));
free(line);
if(result) {
sshc->actualcode = result;
break;
}
name = name->next;
}
wolfSSH_SFTPNAME_list_free(origname);
state(data, SSH_STOP);
return result;
}
failf(data, "wolfssh SFTP ls failed: %d", rc);
return CURLE_SSH;
case SSH_SFTP_SHUTDOWN:
Curl_safefree(sshc->homedir);
wolfSSH_free(sshc->ssh_session);
wolfSSH_CTX_free(sshc->ctx);
state(data, SSH_STOP);
return CURLE_OK;
default:
break;
}
} while(!rc && (sshc->state != SSH_STOP));
return result;
}
/* called repeatedly until done from multi.c */
static CURLcode wssh_multi_statemach(struct Curl_easy *data, bool *done)
{
struct connectdata *conn = data->conn;
struct ssh_conn *sshc = &conn->proto.sshc;
CURLcode result = CURLE_OK;
bool block; /* we store the status and use that to provide a ssh_getsock()
implementation */
do {
result = wssh_statemach_act(data, &block);
*done = (sshc->state == SSH_STOP) ? TRUE : FALSE;
/* if there's no error, it isn't done and it didn't EWOULDBLOCK, then
try again */
if(*done) {
DEBUGF(infof(data, "wssh_statemach_act says DONE\n"));
}
} while(!result && !*done && !block);
return result;
}
static
CURLcode wscp_perform(struct Curl_easy *data,
bool *connected,
bool *dophase_done)
{
(void)data;
(void)connected;
(void)dophase_done;
return CURLE_OK;
}
static
CURLcode wsftp_perform(struct Curl_easy *data,
bool *connected,
bool *dophase_done)
{
CURLcode result = CURLE_OK;
struct connectdata *conn = data->conn;
DEBUGF(infof(data, "DO phase starts\n"));
*dophase_done = FALSE; /* not done yet */
/* start the first command in the DO phase */
state(data, SSH_SFTP_QUOTE_INIT);
/* run the state-machine */
result = wssh_multi_statemach(data, dophase_done);
*connected = conn->bits.tcpconnect[FIRSTSOCKET];
if(*dophase_done) {
DEBUGF(infof(data, "DO phase is complete\n"));
}
return result;
}
/*
* The DO function is generic for both protocols.
*/
static CURLcode wssh_do(struct Curl_easy *data, bool *done)
{
CURLcode result;
bool connected = 0;
struct connectdata *conn = data->conn;
struct ssh_conn *sshc = &conn->proto.sshc;
*done = FALSE; /* default to false */
data->req.size = -1; /* make sure this is unknown at this point */
sshc->actualcode = CURLE_OK; /* reset error code */
sshc->secondCreateDirs = 0; /* reset the create dir attempt state
variable */
Curl_pgrsSetUploadCounter(data, 0);
Curl_pgrsSetDownloadCounter(data, 0);
Curl_pgrsSetUploadSize(data, -1);
Curl_pgrsSetDownloadSize(data, -1);
if(conn->handler->protocol & CURLPROTO_SCP)
result = wscp_perform(data, &connected, done);
else
result = wsftp_perform(data, &connected, done);
return result;
}
static CURLcode wssh_block_statemach(struct Curl_easy *data,
bool disconnect)
{
struct connectdata *conn = data->conn;
struct ssh_conn *sshc = &conn->proto.sshc;
CURLcode result = CURLE_OK;
while((sshc->state != SSH_STOP) && !result) {
bool block;
timediff_t left = 1000;
struct curltime now = Curl_now();
result = wssh_statemach_act(data, &block);
if(result)
break;
if(!disconnect) {
if(Curl_pgrsUpdate(data))
return CURLE_ABORTED_BY_CALLBACK;
result = Curl_speedcheck(data, now);
if(result)
break;
left = Curl_timeleft(data, NULL, FALSE);
if(left < 0) {
failf(data, "Operation timed out");
return CURLE_OPERATION_TIMEDOUT;
}
}
if(!result) {
int dir = conn->waitfor;
curl_socket_t sock = conn->sock[FIRSTSOCKET];
curl_socket_t fd_read = CURL_SOCKET_BAD;
curl_socket_t fd_write = CURL_SOCKET_BAD;
if(dir == KEEP_RECV)
fd_read = sock;
else if(dir == KEEP_SEND)
fd_write = sock;
/* wait for the socket to become ready */
(void)Curl_socket_check(fd_read, CURL_SOCKET_BAD, fd_write,
left>1000?1000:left); /* ignore result */
}
}
return result;
}
/* generic done function for both SCP and SFTP called from their specific
done functions */
static CURLcode wssh_done(struct Curl_easy *data, CURLcode status)
{
CURLcode result = CURLE_OK;
struct SSHPROTO *sftp_scp = data->req.p.ssh;
if(!status) {
/* run the state-machine */
result = wssh_block_statemach(data, FALSE);
}
else
result = status;
if(sftp_scp)
Curl_safefree(sftp_scp->path);
if(Curl_pgrsDone(data))
return CURLE_ABORTED_BY_CALLBACK;
data->req.keepon = 0; /* clear all bits */
return result;
}
#if 0
static CURLcode wscp_done(struct Curl_easy *data,
CURLcode code, bool premature)
{
CURLcode result = CURLE_OK;
(void)conn;
(void)code;
(void)premature;
return result;
}
static CURLcode wscp_doing(struct Curl_easy *data,
bool *dophase_done)
{
CURLcode result = CURLE_OK;
(void)conn;
(void)dophase_done;
return result;
}
static CURLcode wscp_disconnect(struct Curl_easy *data,
struct connectdata *conn, bool dead_connection)
{
CURLcode result = CURLE_OK;
(void)data;
(void)conn;
(void)dead_connection;
return result;
}
#endif
static CURLcode wsftp_done(struct Curl_easy *data,
CURLcode code, bool premature)
{
(void)premature;
state(data, SSH_SFTP_CLOSE);
return wssh_done(data, code);
}
static CURLcode wsftp_doing(struct Curl_easy *data,
bool *dophase_done)
{
CURLcode result = wssh_multi_statemach(data, dophase_done);
if(*dophase_done) {
DEBUGF(infof(data, "DO phase is complete\n"));
}
return result;
}
static CURLcode wsftp_disconnect(struct Curl_easy *data,
struct connectdata *conn,
bool dead)
{
CURLcode result = CURLE_OK;
(void)dead;
DEBUGF(infof(data, "SSH DISCONNECT starts now\n"));
if(conn->proto.sshc.ssh_session) {
/* only if there's a session still around to use! */
state(data, SSH_SFTP_SHUTDOWN);
result = wssh_block_statemach(data, TRUE);
}
DEBUGF(infof(data, "SSH DISCONNECT is done\n"));
return result;
}
static int wssh_getsock(struct Curl_easy *data,
struct connectdata *conn,
curl_socket_t *sock)
{
int bitmap = GETSOCK_BLANK;
int dir = conn->waitfor;
(void)data;
sock[0] = conn->sock[FIRSTSOCKET];
if(dir == KEEP_RECV)
bitmap |= GETSOCK_READSOCK(FIRSTSOCKET);
else if(dir == KEEP_SEND)
bitmap |= GETSOCK_WRITESOCK(FIRSTSOCKET);
return bitmap;
}
size_t Curl_ssh_version(char *buffer, size_t buflen)
{
return msnprintf(buffer, buflen, "wolfssh/%s", LIBWOLFSSH_VERSION_STRING);
}
CURLcode Curl_ssh_init(void)
{
if(WS_SUCCESS != wolfSSH_Init()) {
DEBUGF(fprintf(stderr, "Error: wolfSSH_Init failed\n"));
return CURLE_FAILED_INIT;
}
return CURLE_OK;
}
void Curl_ssh_cleanup(void)
{
}
#endif /* USE_WOLFSSH */
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