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7a7f490efa
curl/lib/ssh.c
Daniel Stenberg bb667c8ac6 rename variable to prevent shadow warning
2007-09-28 21:45:05 +00:00

2300 lines
68 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2007, 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 http://curl.haxx.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.
*
* $Id$
***************************************************************************/
/* #define CURL_LIBSSH2_DEBUG */
#include "setup.h"
#ifdef USE_LIBSSH2
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <ctype.h>
#include <limits.h>
#include <libssh2.h>
#include <libssh2_sftp.h>
#if !defined(LIBSSH2_VERSION_NUM) || (LIBSSH2_VERSION_NUM < 0x001000)
#error "this requires libssh2 0.16 or later"
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#ifndef WIN32
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_UTSNAME_H
#include <sys/utsname.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef VMS
#include <in.h>
#include <inet.h>
#endif
#endif /* !WIN32 */
#if (defined(NETWARE) && defined(__NOVELL_LIBC__))
#undef in_addr_t
#define in_addr_t unsigned long
#endif
#include <curl/curl.h>
#include "urldata.h"
#include "sendf.h"
#include "easyif.h" /* for Curl_convert_... prototypes */
#include "if2ip.h"
#include "hostip.h"
#include "progress.h"
#include "transfer.h"
#include "escape.h"
#include "http.h" /* for HTTP proxy tunnel stuff */
#include "ssh.h"
#include "url.h"
#include "speedcheck.h"
#include "getinfo.h"
#include "strequal.h"
#include "sslgen.h"
#include "connect.h"
#include "strerror.h"
#include "memory.h"
#include "inet_ntop.h"
#include "select.h"
#include "parsedate.h" /* for the week day and month names */
#include "sockaddr.h" /* required for Curl_sockaddr_storage */
#include "multiif.h"
#if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
#include "inet_ntoa_r.h"
#endif
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
/* The last #include file should be: */
#ifdef CURLDEBUG
#include "memdebug.h"
#endif
#ifndef PATH_MAX
#define PATH_MAX 1024 /* just an extra precaution since there are systems that
have their definition hidden well */
#endif
/* Local functions: */
static const char *sftp_libssh2_strerror(unsigned long err);
static LIBSSH2_ALLOC_FUNC(libssh2_malloc);
static LIBSSH2_REALLOC_FUNC(libssh2_realloc);
static LIBSSH2_FREE_FUNC(libssh2_free);
static int get_pathname(const char **cpp, char **path);
static void
kbd_callback(const char *name, int name_len, const char *instruction,
int instruction_len, int num_prompts,
const LIBSSH2_USERAUTH_KBDINT_PROMPT *prompts,
LIBSSH2_USERAUTH_KBDINT_RESPONSE *responses,
void **abstract)
{
struct SSHPROTO *ssh = (struct SSHPROTO *)*abstract;
#ifdef CURL_LIBSSH2_DEBUG
fprintf(stderr, "name=%s\n", name);
fprintf(stderr, "name_len=%d\n", name_len);
fprintf(stderr, "instruction=%s\n", instruction);
fprintf(stderr, "instruction_len=%d\n", instruction_len);
fprintf(stderr, "num_prompts=%d\n", num_prompts);
#else
(void)name;
(void)name_len;
(void)instruction;
(void)instruction_len;
#endif /* CURL_LIBSSH2_DEBUG */
if (num_prompts == 1) {
responses[0].text = strdup(ssh->passwd);
responses[0].length = strlen(ssh->passwd);
}
(void)prompts;
(void)abstract;
} /* kbd_callback */
static CURLcode sftp_libssh2_error_to_CURLE(unsigned long err)
{
switch (err) {
case LIBSSH2_FX_OK:
return CURLE_OK;
case LIBSSH2_FX_NO_SUCH_FILE:
case LIBSSH2_FX_NO_SUCH_PATH:
return CURLE_REMOTE_FILE_NOT_FOUND;
case LIBSSH2_FX_PERMISSION_DENIED:
case LIBSSH2_FX_WRITE_PROTECT:
case LIBSSH2_FX_LOCK_CONFlICT:
return CURLE_REMOTE_ACCESS_DENIED;
case LIBSSH2_FX_NO_SPACE_ON_FILESYSTEM:
case LIBSSH2_FX_QUOTA_EXCEEDED:
return CURLE_REMOTE_DISK_FULL;
case LIBSSH2_FX_FILE_ALREADY_EXISTS:
return CURLE_REMOTE_FILE_EXISTS;
case LIBSSH2_FX_DIR_NOT_EMPTY:
return CURLE_QUOTE_ERROR;
default:
break;
}
return CURLE_SSH;
}
static CURLcode libssh2_session_error_to_CURLE(int err)
{
if (err == LIBSSH2_ERROR_ALLOC)
return CURLE_OUT_OF_MEMORY;
/* TODO: map some more of the libssh2 errors to the more appropriate CURLcode
error code, and possibly add a few new SSH-related one. We must however
not return or even depend on libssh2 errors in the public libcurl API */
return CURLE_SSH;
}
static LIBSSH2_ALLOC_FUNC(libssh2_malloc)
{
return malloc(count);
(void)abstract;
}
static LIBSSH2_REALLOC_FUNC(libssh2_realloc)
{
return realloc(ptr, count);
(void)abstract;
}
static LIBSSH2_FREE_FUNC(libssh2_free)
{
free(ptr);
(void)abstract;
}
/*
* SSH State machine related code
*/
/* This is the ONLY way to change SSH state! */
static void state(struct connectdata *conn, sshstate nowstate)
{
#if defined(CURLDEBUG) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
/* for debug purposes */
static const char * const names[] = {
"SSH_STOP",
"SSH_S_STARTUP",
"SSH_AUTHLIST",
"SSH_AUTH_PKEY_INIT",
"SSH_AUTH_PKEY",
"SSH_AUTH_PASS_INIT",
"SSH_AUTH_PASS",
"SSH_AUTH_HOST_INIT",
"SSH_AUTH_HOST",
"SSH_AUTH_KEY_INIT",
"SSH_AUTH_KEY",
"SSH_AUTH_DONE",
"SSH_SFTP_INIT",
"SSH_SFTP_REALPATH",
"SSH_GET_WORKINGPATH",
"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_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_DONE",
"SSH_SCP_SEND_EOF",
"SSH_SCP_WAIT_EOF",
"SSH_SCP_WAIT_CLOSE",
"SSH_SCP_CHANNEL_FREE",
"SSH_CHANNEL_CLOSE",
"SSH_SESSION_DISCONECT",
"SSH_SESSION_FREE",
"QUIT"
};
#endif
struct ssh_conn *sshc = &conn->proto.sshc;
#if defined(CURLDEBUG) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
if (sshc->state != nowstate) {
infof(conn->data, "SFTP %p state change from %s to %s\n",
sshc, names[sshc->state], names[nowstate]);
}
#endif
sshc->state = nowstate;
}
static CURLcode ssh_statemach_act(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
struct SSHPROTO *sftp_scp = data->reqdata.proto.ssh;
struct ssh_conn *sshc = &conn->proto.sshc;
curl_socket_t sock = conn->sock[FIRSTSOCKET];
#ifdef CURL_LIBSSH2_DEBUG
const char *fingerprint;
#endif /* CURL_LIBSSH2_DEBUG */
int rc;
long err;
switch(sshc->state) {
case SSH_S_STARTUP:
sshc->secondCreateDirs = 0;
sshc->nextState = SSH_NO_STATE;
sshc->actualCode = CURLE_OK;
rc = libssh2_session_startup(sftp_scp->ssh_session, sock);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc) {
failf(data, "Failure establishing ssh session");
state(conn, SSH_SESSION_FREE);
sshc->actualCode = CURLE_FAILED_INIT;
break;
}
/* Set libssh2 to non-blocking, since cURL is all non-blocking */
libssh2_session_set_blocking(sftp_scp->ssh_session, 0);
#ifdef CURL_LIBSSH2_DEBUG
/*
* Before we authenticate we should check the hostkey's fingerprint
* against our known hosts. How that is handled (reading from file,
* whatever) is up to us. As for know not much is implemented, besides
* showing how to get the fingerprint.
*/
fingerprint = libssh2_hostkey_hash(sftp_scp->ssh_session,
LIBSSH2_HOSTKEY_HASH_MD5);
/* The fingerprint points to static storage (!), don't free() it. */
infof(data, "Fingerprint: ");
for (rc = 0; rc < 16; rc++) {
infof(data, "%02X ", (unsigned char) fingerprint[rc]);
}
infof(data, "\n");
#endif /* CURL_LIBSSH2_DEBUG */
state(conn, SSH_AUTHLIST);
break;
case SSH_AUTHLIST:
/* TBD - methods to check the host keys need to be done */
/*
* Figure out authentication methods
* NB: As soon as we have provided a username to an openssh server we
* must never change it later. Thus, always specify the correct username
* here, even though the libssh2 docs kind of indicate that it should be
* possible to get a 'generic' list (not user-specific) of authentication
* methods, presumably with a blank username. That won't work in my
* experience.
* So always specify it here.
*/
sshc->authlist = libssh2_userauth_list(sftp_scp->ssh_session,
sftp_scp->user,
strlen(sftp_scp->user));
if (!sshc->authlist) {
if ((err = libssh2_session_last_errno(sftp_scp->ssh_session)) ==
LIBSSH2_ERROR_EAGAIN) {
break;
} else {
state(conn, SSH_SESSION_FREE);
sshc->actualCode = libssh2_session_error_to_CURLE(err);
break;
}
}
infof(data, "SSH authentication methods available: %s\n", sshc->authlist);
state(conn, SSH_AUTH_PKEY_INIT);
break;
case SSH_AUTH_PKEY_INIT:
/*
* Check the supported auth types in the order I feel is most secure
* with the requested type of authentication
*/
sshc->authed = FALSE;
if ((data->set.ssh_auth_types & CURLSSH_AUTH_PUBLICKEY) &&
(strstr(sshc->authlist, "publickey") != NULL)) {
char *home;
sshc->rsa_pub = sshc->rsa = NULL;
/* To ponder about: should really the lib be messing about with the
HOME environment variable etc? */
home = curl_getenv("HOME");
if (data->set.str[STRING_SSH_PUBLIC_KEY])
sshc->rsa_pub = aprintf("%s", data->set.str[STRING_SSH_PUBLIC_KEY]);
else if (home)
sshc->rsa_pub = aprintf("%s/.ssh/id_dsa.pub", home);
else
/* as a final resort, try current dir! */
sshc->rsa_pub = strdup("id_dsa.pub");
if (sshc->rsa_pub == NULL) {
Curl_safefree(home);
home = NULL;
state(conn, SSH_SESSION_FREE);
sshc->actualCode = CURLE_OUT_OF_MEMORY;
break;
}
if (data->set.str[STRING_SSH_PRIVATE_KEY])
sshc->rsa = aprintf("%s", data->set.str[STRING_SSH_PRIVATE_KEY]);
else if (home)
sshc->rsa = aprintf("%s/.ssh/id_dsa", home);
else
/* as a final resort, try current dir! */
sshc->rsa = strdup("id_dsa");
if (sshc->rsa == NULL) {
Curl_safefree(home);
home = NULL;
Curl_safefree(sshc->rsa_pub);
sshc->rsa_pub = NULL;
state(conn, SSH_SESSION_FREE);
sshc->actualCode = CURLE_OUT_OF_MEMORY;
break;
}
sshc->passphrase = data->set.str[STRING_KEY_PASSWD];
if (!sshc->passphrase)
sshc->passphrase = "";
Curl_safefree(home);
home = NULL;
infof(data, "Using ssh public key file %s\n", sshc->rsa_pub);
infof(data, "Using ssh private key file %s\n", sshc->rsa);
state(conn, SSH_AUTH_PKEY);
} else {
state(conn, SSH_AUTH_PASS_INIT);
}
break;
case SSH_AUTH_PKEY:
/* The function below checks if the files exists, no need to stat() here.
*/
rc = libssh2_userauth_publickey_fromfile(sftp_scp->ssh_session,
sftp_scp->user, sshc->rsa_pub,
sshc->rsa, sshc->passphrase);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
Curl_safefree(sshc->rsa_pub);
sshc->rsa_pub = NULL;
Curl_safefree(sshc->rsa);
sshc->rsa = NULL;
if (rc == 0) {
sshc->authed = TRUE;
infof(data, "Initialized SSH public key authentication\n");
state(conn, SSH_AUTH_DONE);
} else {
state(conn, SSH_AUTH_PASS_INIT);
}
break;
case SSH_AUTH_PASS_INIT:
if ((data->set.ssh_auth_types & CURLSSH_AUTH_PASSWORD) &&
(strstr(sshc->authlist, "password") != NULL)) {
state(conn, SSH_AUTH_PASS);
} else {
state(conn, SSH_AUTH_HOST_INIT);
}
break;
case SSH_AUTH_PASS:
rc = libssh2_userauth_password(sftp_scp->ssh_session, sftp_scp->user,
sftp_scp->passwd);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc == 0) {
sshc->authed = TRUE;
infof(data, "Initialized password authentication\n");
state(conn, SSH_AUTH_DONE);
} else {
state(conn, SSH_AUTH_HOST_INIT);
}
break;
case SSH_AUTH_HOST_INIT:
if ((data->set.ssh_auth_types & CURLSSH_AUTH_HOST) &&
(strstr(sshc->authlist, "hostbased") != NULL)) {
state(conn, SSH_AUTH_HOST);
} else {
state(conn, SSH_AUTH_KEY_INIT);
}
break;
case SSH_AUTH_HOST:
state(conn, SSH_AUTH_KEY_INIT);
break;
case SSH_AUTH_KEY_INIT:
if ((data->set.ssh_auth_types & CURLSSH_AUTH_KEYBOARD)
&& (strstr(sshc->authlist, "keyboard-interactive") != NULL)) {
state(conn, SSH_AUTH_KEY);
} else {
state(conn, SSH_AUTH_DONE);
}
break;
case SSH_AUTH_KEY:
/* Authentication failed. Continue with keyboard-interactive now. */
rc = libssh2_userauth_keyboard_interactive_ex(sftp_scp->ssh_session,
sftp_scp->user,
strlen(sftp_scp->user),
&kbd_callback);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc == 0) {
sshc->authed = TRUE;
infof(data, "Initialized keyboard interactive authentication\n");
}
state(conn, SSH_AUTH_DONE);
break;
case SSH_AUTH_DONE:
if (!sshc->authed) {
failf(data, "Authentication failure");
state(conn, SSH_SESSION_FREE);
sshc->actualCode = CURLE_LOGIN_DENIED;
break;
}
/*
* At this point we have an authenticated ssh session.
*/
infof(data, "Authentication complete\n");
conn->sockfd = sock;
conn->writesockfd = CURL_SOCKET_BAD;
if (conn->protocol == PROT_SFTP) {
state(conn, SSH_SFTP_INIT);
break;
}
state(conn, SSH_GET_WORKINGPATH);
break;
case SSH_SFTP_INIT:
/*
* Start the libssh2 sftp session
*/
sftp_scp->sftp_session = libssh2_sftp_init(sftp_scp->ssh_session);
if (!sftp_scp->sftp_session) {
if (libssh2_session_last_errno(sftp_scp->ssh_session) ==
LIBSSH2_ERROR_EAGAIN) {
break;
} else {
failf(data, "Failure initialising sftp session\n");
state(conn, SSH_SESSION_FREE);
sshc->actualCode = CURLE_FAILED_INIT;
break;
}
}
state(conn, SSH_SFTP_REALPATH);
break;
case SSH_SFTP_REALPATH:
{
char tempHome[PATH_MAX];
/*
* Get the "home" directory
*/
rc = libssh2_sftp_realpath(sftp_scp->sftp_session, ".",
tempHome, PATH_MAX-1);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc > 0) {
/* It seems that this string is not always NULL terminated */
tempHome[rc] = '\0';
sftp_scp->homedir = (char *)strdup(tempHome);
if (!sftp_scp->homedir) {
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_OUT_OF_MEMORY;
break;
}
} else {
/* Return the error type */
result = libssh2_sftp_last_error(sftp_scp->sftp_session);
DEBUGF(infof(data, "error = %d\n", result));
state(conn, SSH_STOP);
break;
}
state(conn, SSH_GET_WORKINGPATH);
}
break;
case SSH_GET_WORKINGPATH:
{
char *real_path;
char *working_path;
int working_path_len;
working_path = curl_easy_unescape(data, data->reqdata.path, 0,
&working_path_len);
if (!working_path) {
result = CURLE_OUT_OF_MEMORY;
state(conn, SSH_STOP);
break;
}
/* Check for /~/ , indicating relative to the user's home directory */
if (conn->protocol == PROT_SCP) {
real_path = (char *)malloc(working_path_len+1);
if (real_path == NULL) {
Curl_safefree(working_path);
working_path = NULL;
state(conn, SSH_SESSION_FREE);
sshc->actualCode = CURLE_OUT_OF_MEMORY;
break;
}
if (working_path[1] == '~')
/* It is referenced to the home directory, so strip the
leading '/' */
memcpy(real_path, working_path+1, 1 + working_path_len-1);
else
memcpy(real_path, working_path, 1 + working_path_len);
}
else if (conn->protocol == PROT_SFTP) {
if (working_path[1] == '~') {
real_path = (char *)malloc(strlen(sftp_scp->homedir) +
working_path_len + 1);
if (real_path == NULL) {
Curl_safefree(sftp_scp->homedir);
sftp_scp->homedir = NULL;
Curl_safefree(working_path);
working_path = NULL;
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_OUT_OF_MEMORY;
break;
}
/* It is referenced to the home directory, so strip the
leading '/' */
memcpy(real_path, sftp_scp->homedir, strlen(sftp_scp->homedir));
real_path[strlen(sftp_scp->homedir)] = '/';
real_path[strlen(sftp_scp->homedir)+1] = '\0';
if (working_path_len > 3) {
memcpy(real_path+strlen(sftp_scp->homedir)+1, working_path + 3,
1 + working_path_len -3);
}
}
else {
real_path = (char *)malloc(working_path_len+1);
if (real_path == NULL) {
Curl_safefree(sftp_scp->homedir);
sftp_scp->homedir = NULL;
Curl_safefree(working_path);
working_path = NULL;
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_OUT_OF_MEMORY;
break;
}
memcpy(real_path, working_path, 1+working_path_len);
}
}
else {
Curl_safefree(working_path);
working_path = NULL;
state(conn, SSH_SESSION_FREE);
sshc->actualCode = CURLE_FAILED_INIT;
break;
}
Curl_safefree(working_path);
working_path = NULL;
sftp_scp->path = real_path;
/* Connect is all done */
state(conn, SSH_STOP);
}
break;
case SSH_SFTP_QUOTE_INIT:
if (data->set.quote) {
infof(data, "Sending quote commands\n");
sshc->quote_item = data->set.quote;
state(conn, SSH_SFTP_QUOTE);
} else {
state(conn, SSH_SFTP_TRANS_INIT);
}
break;
case SSH_SFTP_POSTQUOTE_INIT:
if (data->set.postquote) {
infof(data, "Sending quote commands\n");
sshc->quote_item = data->set.postquote;
state(conn, SSH_SFTP_QUOTE);
} else {
state(conn, SSH_STOP);
}
break;
case SSH_SFTP_QUOTE:
/* Send any quote commands */
{
const char *cp;
/*
* Support some of the "FTP" commands
*/
if (curl_strnequal(sshc->quote_item->data, "PWD", 3)) {
/* output debug output if that is requested */
if (data->set.verbose) {
char tmp[PATH_MAX+1];
Curl_debug(data, CURLINFO_HEADER_OUT, (char *)"PWD\n", 4, conn);
snprintf(tmp, PATH_MAX, "257 \"%s\" is current directory.\n",
sftp_scp->path);
Curl_debug(data, CURLINFO_HEADER_IN, tmp, strlen(tmp), conn);
}
state(conn, SSH_SFTP_NEXT_QUOTE);
break;
}
else if (sshc->quote_item->data) {
fprintf(stderr, "data: %s\n", sshc->quote_item->data);
/*
* the arguments following the command must be separated from the
* command with a space so we can check for it unconditionally
*/
cp = strchr(sshc->quote_item->data, ' ');
if (cp == NULL) {
failf(data, "Syntax error in SFTP command. Supply parameter(s)!");
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_QUOTE_ERROR;
break;
}
/*
* also, every command takes at least one argument so we get that
* first argument right now
*/
err = get_pathname(&cp, &sshc->quote_path1);
if (err) {
if (err == CURLE_OUT_OF_MEMORY)
failf(data, "Out of memory");
else
failf(data, "Syntax error: Bad first parameter");
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = err;
break;
}
/*
* SFTP is a binary protocol, so we don't send text commands to
* the server. Instead, we scan for commands for commands used by
* OpenSSH's sftp program and call the appropriate libssh2
* functions.
*/
if (curl_strnequal(sshc->quote_item->data, "chgrp ", 6) ||
curl_strnequal(sshc->quote_item->data, "chmod ", 6) ||
curl_strnequal(sshc->quote_item->data, "chown ", 6) ) {
/* attribute change */
/* sshc->quote_path1 contains the mode to set */
/* get the destination */
err = get_pathname(&cp, &sshc->quote_path2);
if (err) {
if (err == CURLE_OUT_OF_MEMORY)
failf(data, "Out of memory");
else
failf(data, "Syntax error in chgrp/chmod/chown: "
"Bad second parameter");
Curl_safefree(sshc->quote_path1);
sshc->quote_path1 = NULL;
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = err;
break;
}
memset(&sshc->quote_attrs, 0, sizeof(LIBSSH2_SFTP_ATTRIBUTES));
state(conn, SSH_SFTP_QUOTE_STAT);
break;
}
else if (curl_strnequal(sshc->quote_item->data, "ln ", 3) ||
curl_strnequal(sshc->quote_item->data, "symlink ", 8)) {
/* symbolic linking */
/* sshc->quote_path1 is the source */
/* get the destination */
err = get_pathname(&cp, &sshc->quote_path2);
if (err) {
if (err == CURLE_OUT_OF_MEMORY)
failf(data, "Out of memory");
else
failf(data,
"Syntax error in ln/symlink: Bad second parameter");
Curl_safefree(sshc->quote_path1);
sshc->quote_path1 = NULL;
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = err;
break;
}
state(conn, SSH_SFTP_QUOTE_SYMLINK);
break;
}
else if (curl_strnequal(sshc->quote_item->data, "mkdir ", 6)) {
/* create dir */
state(conn, SSH_SFTP_QUOTE_MKDIR);
break;
}
else if (curl_strnequal(sshc->quote_item->data, "rename ", 7)) {
/* rename file */
/* first param is the source path */
/* second param is the dest. path */
err = get_pathname(&cp, &sshc->quote_path2);
if (err) {
if (err == CURLE_OUT_OF_MEMORY)
failf(data, "Out of memory");
else
failf(data, "Syntax error in rename: Bad second parameter");
Curl_safefree(sshc->quote_path1);
sshc->quote_path1 = NULL;
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = err;
break;
}
state(conn, SSH_SFTP_QUOTE_RENAME);
break;
}
else if (curl_strnequal(sshc->quote_item->data, "rmdir ", 6)) {
/* delete dir */
state(conn, SSH_SFTP_QUOTE_RMDIR);
break;
}
else if (curl_strnequal(sshc->quote_item->data, "rm ", 3)) {
state(conn, SSH_SFTP_QUOTE_UNLINK);
break;
}
if (sshc->quote_path1) {
Curl_safefree(sshc->quote_path1);
sshc->quote_path1 = NULL;
}
if (sshc->quote_path2) {
Curl_safefree(sshc->quote_path2);
sshc->quote_path2 = NULL;
}
}
}
if (!sshc->quote_item) {
state(conn, SSH_SFTP_TRANS_INIT);
}
break;
case SSH_SFTP_NEXT_QUOTE:
if (sshc->quote_path1) {
Curl_safefree(sshc->quote_path1);
sshc->quote_path1 = NULL;
}
if (sshc->quote_path2) {
Curl_safefree(sshc->quote_path2);
sshc->quote_path2 = NULL;
}
sshc->quote_item = sshc->quote_item->next;
if (sshc->quote_item) {
state(conn, SSH_SFTP_QUOTE);
} else {
if (sshc->nextState != SSH_NO_STATE) {
state(conn, sshc->nextState);
sshc->nextState = SSH_NO_STATE;
} else {
state(conn, SSH_SFTP_TRANS_INIT);
}
}
break;
case SSH_SFTP_QUOTE_STAT:
rc = libssh2_sftp_stat(sftp_scp->sftp_session, sshc->quote_path2,
&sshc->quote_attrs);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc != 0) { /* get those attributes */
err = libssh2_sftp_last_error(sftp_scp->sftp_session);
Curl_safefree(sshc->quote_path1);
sshc->quote_path1 = NULL;
Curl_safefree(sshc->quote_path2);
sshc->quote_path2 = NULL;
failf(data, "Attempt to get SFTP stats failed: %s",
sftp_libssh2_strerror(err));
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_QUOTE_ERROR;
break;
}
/* Now set the new attributes... */
if (curl_strnequal(sshc->quote_item->data, "chgrp", 5)) {
sshc->quote_attrs.gid = strtol(sshc->quote_path1, NULL, 10);
if (sshc->quote_attrs.gid == 0 && !ISDIGIT(sshc->quote_path1[0])) {
Curl_safefree(sshc->quote_path1);
sshc->quote_path1 = NULL;
Curl_safefree(sshc->quote_path2);
sshc->quote_path2 = NULL;
failf(data, "Syntax error: chgrp gid not a number");
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_QUOTE_ERROR;
break;
}
}
else if (curl_strnequal(sshc->quote_item->data, "chmod", 5)) {
sshc->quote_attrs.permissions = strtol(sshc->quote_path1, NULL, 8);
/* permissions are octal */
if (sshc->quote_attrs.permissions == 0 &&
!ISDIGIT(sshc->quote_path1[0])) {
Curl_safefree(sshc->quote_path1);
sshc->quote_path1 = NULL;
Curl_safefree(sshc->quote_path2);
sshc->quote_path2 = NULL;
failf(data, "Syntax error: chmod permissions not a number");
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_QUOTE_ERROR;
break;
}
}
else if (curl_strnequal(sshc->quote_item->data, "chown", 5)) {
sshc->quote_attrs.uid = strtol(sshc->quote_path1, NULL, 10);
if (sshc->quote_attrs.uid == 0 && !ISDIGIT(sshc->quote_path1[0])) {
Curl_safefree(sshc->quote_path1);
sshc->quote_path1 = NULL;
Curl_safefree(sshc->quote_path2);
sshc->quote_path2 = NULL;
failf(data, "Syntax error: chown uid not a number");
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_QUOTE_ERROR;
break;
}
}
/* Now send the completed structure... */
state(conn, SSH_SFTP_QUOTE_SETSTAT);
break;
case SSH_SFTP_QUOTE_SETSTAT:
rc = libssh2_sftp_setstat(sftp_scp->sftp_session, sshc->quote_path2,
&sshc->quote_attrs);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
} else if (rc != 0) {
err = libssh2_sftp_last_error(sftp_scp->sftp_session);
Curl_safefree(sshc->quote_path1);
sshc->quote_path1 = NULL;
Curl_safefree(sshc->quote_path2);
sshc->quote_path2 = NULL;
failf(data, "Attempt to set SFTP stats failed: %s",
sftp_libssh2_strerror(err));
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_QUOTE_ERROR;
break;
}
state(conn, SSH_SFTP_NEXT_QUOTE);
break;
case SSH_SFTP_QUOTE_SYMLINK:
rc = libssh2_sftp_symlink(sftp_scp->sftp_session, sshc->quote_path1,
sshc->quote_path2);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc != 0) {
err = libssh2_sftp_last_error(sftp_scp->sftp_session);
Curl_safefree(sshc->quote_path1);
sshc->quote_path1 = NULL;
Curl_safefree(sshc->quote_path2);
sshc->quote_path2 = NULL;
failf(data, "symlink command failed: %s",
sftp_libssh2_strerror(err));
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_QUOTE_ERROR;
break;
}
state(conn, SSH_SFTP_NEXT_QUOTE);
break;
case SSH_SFTP_QUOTE_MKDIR:
rc = libssh2_sftp_mkdir(sftp_scp->sftp_session, sshc->quote_path1, 0755);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc != 0) {
err = libssh2_sftp_last_error(sftp_scp->sftp_session);
Curl_safefree(sshc->quote_path1);
sshc->quote_path1 = NULL;
failf(data, "mkdir command failed: %s", sftp_libssh2_strerror(err));
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_QUOTE_ERROR;
break;
}
state(conn, SSH_SFTP_NEXT_QUOTE);
break;
case SSH_SFTP_QUOTE_RENAME:
rc = libssh2_sftp_rename(sftp_scp->sftp_session, sshc->quote_path1,
sshc->quote_path2);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
} else if (rc != 0) {
err = libssh2_sftp_last_error(sftp_scp->sftp_session);
Curl_safefree(sshc->quote_path1);
sshc->quote_path1 = NULL;
Curl_safefree(sshc->quote_path2);
sshc->quote_path2 = NULL;
failf(data, "rename command failed: %s", sftp_libssh2_strerror(err));
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_QUOTE_ERROR;
break;
}
state(conn, SSH_SFTP_NEXT_QUOTE);
break;
case SSH_SFTP_QUOTE_RMDIR:
rc = libssh2_sftp_rmdir(sftp_scp->sftp_session, sshc->quote_path1);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc != 0) {
err = libssh2_sftp_last_error(sftp_scp->sftp_session);
Curl_safefree(sshc->quote_path1);
sshc->quote_path1 = NULL;
failf(data, "rmdir command failed: %s", sftp_libssh2_strerror(err));
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_QUOTE_ERROR;
break;
}
state(conn, SSH_SFTP_NEXT_QUOTE);
break;
case SSH_SFTP_QUOTE_UNLINK:
rc = libssh2_sftp_unlink(sftp_scp->sftp_session, sshc->quote_path1);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc != 0) {
err = libssh2_sftp_last_error(sftp_scp->sftp_session);
Curl_safefree(sshc->quote_path1);
sshc->quote_path1 = NULL;
failf(data, "rm command failed: %s", sftp_libssh2_strerror(err));
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_QUOTE_ERROR;
break;
}
state(conn, SSH_SFTP_NEXT_QUOTE);
break;
case SSH_SFTP_TRANS_INIT:
if (data->set.upload) {
state(conn, SSH_SFTP_UPLOAD_INIT);
break;
} else {
if (sftp_scp->path[strlen(sftp_scp->path)-1] == '/') {
state(conn, SSH_SFTP_READDIR_INIT);
break;
} else {
state(conn, SSH_SFTP_DOWNLOAD_INIT);
break;
}
}
break;
case SSH_SFTP_UPLOAD_INIT:
/*
* NOTE!!! libssh2 requires that the destination path is a full path
* that includes the destination file and name OR ends in a "/"
* If this is not done the destination file will be named the
* same name as the last directory in the path.
*/
sftp_scp->sftp_handle =
libssh2_sftp_open(sftp_scp->sftp_session, sftp_scp->path,
LIBSSH2_FXF_WRITE|LIBSSH2_FXF_CREAT|LIBSSH2_FXF_TRUNC,
data->set.new_file_perms);
if (!sftp_scp->sftp_handle) {
if (libssh2_session_last_errno(sftp_scp->ssh_session) ==
LIBSSH2_ERROR_EAGAIN) {
break;
} else {
err = libssh2_sftp_last_error(sftp_scp->sftp_session);
failf(data, "Upload failed: %s", sftp_libssh2_strerror(err));
if (sshc->secondCreateDirs) {
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = err;
break;
}
else if (((err == LIBSSH2_FX_NO_SUCH_FILE) ||
(err == LIBSSH2_FX_FAILURE) ||
(err == LIBSSH2_FX_NO_SUCH_PATH)) &&
(data->set.ftp_create_missing_dirs &&
(strlen(sftp_scp->path) > 1))) {
/* try to create the path remotely */
sshc->secondCreateDirs = 1;
state(conn, SSH_SFTP_CREATE_DIRS_INIT);
break;
}
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = sftp_libssh2_error_to_CURLE(err);
break;
}
}
/* upload data */
result = Curl_setup_transfer(conn, -1, -1, FALSE, NULL,
FIRSTSOCKET, NULL);
if (result) {
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = result;
} else {
state(conn, SSH_STOP);
}
break;
case SSH_SFTP_CREATE_DIRS_INIT:
if (strlen(sftp_scp->path) > 1) {
sshc->slash_pos = sftp_scp->path + 1; /* ignore the leading '/' */
state(conn, SSH_SFTP_CREATE_DIRS);
} else {
state(conn, SSH_SFTP_UPLOAD_INIT);
}
break;
case SSH_SFTP_CREATE_DIRS:
if ((sshc->slash_pos = strchr(sshc->slash_pos, '/')) != NULL) {
*sshc->slash_pos = 0;
infof(data, "Creating directory '%s'\n", sftp_scp->path);
state(conn, SSH_SFTP_CREATE_DIRS_MKDIR);
break;
} else {
state(conn, SSH_SFTP_UPLOAD_INIT);
}
break;
case SSH_SFTP_CREATE_DIRS_MKDIR:
/* 'mode' - parameter is preliminary - default to 0644 */
rc = libssh2_sftp_mkdir(sftp_scp->sftp_session, sftp_scp->path,
data->set.new_directory_perms);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
*sshc->slash_pos = '/';
++sshc->slash_pos;
if (rc == -1) {
unsigned int sftp_err = 0;
/*
* abort if failure wasn't that the dir already exists or the
* permission was denied (creation might succeed further
* down the path) - retry on unspecific FAILURE also
*/
sftp_err = libssh2_sftp_last_error(sftp_scp->sftp_session);
if ((sftp_err != LIBSSH2_FX_FILE_ALREADY_EXISTS) &&
(sftp_err != LIBSSH2_FX_FAILURE) &&
(sftp_err != LIBSSH2_FX_PERMISSION_DENIED)) {
result = sftp_libssh2_error_to_CURLE(sftp_err);
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = result;
break;
}
}
state(conn, SSH_SFTP_CREATE_DIRS);
break;
case SSH_SFTP_READDIR_INIT:
/*
* This is a directory that we are trying to get, so produce a
* directory listing
*/
sftp_scp->sftp_handle = libssh2_sftp_opendir(sftp_scp->sftp_session,
sftp_scp->path);
if (!sftp_scp->sftp_handle) {
if (libssh2_session_last_errno(sftp_scp->ssh_session) ==
LIBSSH2_ERROR_EAGAIN) {
break;
} else {
err = libssh2_sftp_last_error(sftp_scp->sftp_session);
failf(data, "Could not open directory for reading: %s",
sftp_libssh2_strerror(err));
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = sftp_libssh2_error_to_CURLE(err);
break;
}
}
if ((sshc->readdir_filename = (char *)malloc(PATH_MAX+1)) == NULL) {
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_OUT_OF_MEMORY;
break;
}
if ((sshc->readdir_longentry = (char *)malloc(PATH_MAX+1)) == NULL) {
Curl_safefree(sshc->readdir_filename);
sshc->readdir_filename = NULL;
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_OUT_OF_MEMORY;
break;
}
state(conn, SSH_SFTP_READDIR);
break;
case SSH_SFTP_READDIR:
sshc->readdir_len = libssh2_sftp_readdir_ex(sftp_scp->sftp_handle,
sshc->readdir_filename,
PATH_MAX,
sshc->readdir_longentry,
PATH_MAX,
&sshc->readdir_attrs);
if (sshc->readdir_len == LIBSSH2_ERROR_EAGAIN) {
break;
}
if (sshc->readdir_len > 0) {
sshc->readdir_filename[sshc->readdir_len] = '\0';
if (data->set.ftp_list_only) {
char *tmpLine;
tmpLine = aprintf("%s\n", sshc->readdir_filename);
if (tmpLine == NULL) {
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_OUT_OF_MEMORY;
break;
}
result = Curl_client_write(conn, CLIENTWRITE_BODY, tmpLine, 0);
Curl_safefree(tmpLine);
/* output debug output if that is requested */
if (data->set.verbose) {
Curl_debug(data, CURLINFO_DATA_OUT, sshc->readdir_filename,
sshc->readdir_len, conn);
}
} else {
sshc->readdir_currLen = strlen(sshc->readdir_longentry);
sshc->readdir_totalLen = 80 + sshc->readdir_currLen;
sshc->readdir_line = (char *)calloc(sshc->readdir_totalLen, 1);
if (!sshc->readdir_line) {
Curl_safefree(sshc->readdir_filename);
sshc->readdir_filename = NULL;
Curl_safefree(sshc->readdir_longentry);
sshc->readdir_longentry = NULL;
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_OUT_OF_MEMORY;
break;
}
memcpy(sshc->readdir_line, sshc->readdir_longentry,
sshc->readdir_currLen);
if ((sshc->readdir_attrs.flags & LIBSSH2_SFTP_ATTR_PERMISSIONS) &&
((sshc->readdir_attrs.permissions & LIBSSH2_SFTP_S_IFMT) ==
LIBSSH2_SFTP_S_IFLNK)) {
sshc->readdir_linkPath = (char *)malloc(PATH_MAX + 1);
if (sshc->readdir_linkPath == NULL) {
Curl_safefree(sshc->readdir_filename);
sshc->readdir_filename = NULL;
Curl_safefree(sshc->readdir_longentry);
sshc->readdir_longentry = NULL;
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_OUT_OF_MEMORY;
break;
}
snprintf(sshc->readdir_linkPath, PATH_MAX, "%s%s", sftp_scp->path,
sshc->readdir_filename);
state(conn, SSH_SFTP_READDIR_LINK);
break;
}
state(conn, SSH_SFTP_READDIR_BOTTOM);
break;
}
}
else if (sshc->readdir_len == 0) {
Curl_safefree(sshc->readdir_filename);
sshc->readdir_filename = NULL;
Curl_safefree(sshc->readdir_longentry);
sshc->readdir_longentry = NULL;
state(conn, SSH_SFTP_READDIR_DONE);
break;
}
else if (sshc->readdir_len <= 0) {
err = libssh2_sftp_last_error(sftp_scp->sftp_session);
sshc->actualCode = err;
failf(data, "Could not open remote file for reading: %s :: %d",
sftp_libssh2_strerror(err),
libssh2_session_last_errno(sftp_scp->ssh_session));
Curl_safefree(sshc->readdir_filename);
sshc->readdir_filename = NULL;
Curl_safefree(sshc->readdir_longentry);
sshc->readdir_longentry = NULL;
state(conn, SSH_SFTP_CLOSE);
break;
}
break;
case SSH_SFTP_READDIR_LINK:
sshc->readdir_len = libssh2_sftp_readlink(sftp_scp->sftp_session,
sshc->readdir_linkPath,
sshc->readdir_filename,
PATH_MAX);
if (sshc->readdir_len == LIBSSH2_ERROR_EAGAIN) {
break;
}
Curl_safefree(sshc->readdir_linkPath);
sshc->readdir_linkPath = NULL;
sshc->readdir_line = realloc(sshc->readdir_line,
sshc->readdir_totalLen + 4 +
sshc->readdir_len);
if (!sshc->readdir_line) {
Curl_safefree(sshc->readdir_filename);
sshc->readdir_filename = NULL;
Curl_safefree(sshc->readdir_longentry);
sshc->readdir_longentry = NULL;
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = CURLE_OUT_OF_MEMORY;
break;
}
sshc->readdir_currLen += snprintf(sshc->readdir_line +
sshc->readdir_currLen,
sshc->readdir_totalLen -
sshc->readdir_currLen,
" -> %s",
sshc->readdir_filename);
state(conn, SSH_SFTP_READDIR_BOTTOM);
break;
case SSH_SFTP_READDIR_BOTTOM:
sshc->readdir_currLen += snprintf(sshc->readdir_line +
sshc->readdir_currLen,
sshc->readdir_totalLen -
sshc->readdir_currLen, "\n");
result = Curl_client_write(conn, CLIENTWRITE_BODY,
sshc->readdir_line, 0);
/* output debug output if that is requested */
if (data->set.verbose) {
Curl_debug(data, CURLINFO_DATA_OUT, sshc->readdir_line,
sshc->readdir_currLen, conn);
}
Curl_safefree(sshc->readdir_line);
sshc->readdir_line = NULL;
state(conn, SSH_SFTP_READDIR);
break;
case SSH_SFTP_READDIR_DONE:
if (libssh2_sftp_closedir(sftp_scp->sftp_handle) ==
LIBSSH2_ERROR_EAGAIN) {
break;
}
sftp_scp->sftp_handle = NULL;
Curl_safefree(sshc->readdir_filename);
sshc->readdir_filename = NULL;
Curl_safefree(sshc->readdir_longentry);
sshc->readdir_longentry = NULL;
/* no data to transfer */
result = Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
state(conn, SSH_STOP);
break;
case SSH_SFTP_DOWNLOAD_INIT:
/*
* Work on getting the specified file
*/
sftp_scp->sftp_handle =
libssh2_sftp_open(sftp_scp->sftp_session, sftp_scp->path,
LIBSSH2_FXF_READ, data->set.new_file_perms);
if (!sftp_scp->sftp_handle) {
if (libssh2_session_last_errno(sftp_scp->ssh_session) ==
LIBSSH2_ERROR_EAGAIN) {
break;
} else {
err = libssh2_sftp_last_error(sftp_scp->sftp_session);
failf(data, "Could not open remote file for reading: %s",
sftp_libssh2_strerror(err));
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = sftp_libssh2_error_to_CURLE(err);
break;
}
}
state(conn, SSH_SFTP_DOWNLOAD_STAT);
break;
case SSH_SFTP_DOWNLOAD_STAT:
{
LIBSSH2_SFTP_ATTRIBUTES attrs;
rc = libssh2_sftp_stat(sftp_scp->sftp_session, sftp_scp->path, &attrs);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc) {
/*
* libssh2_sftp_open() didn't return an error, so maybe the server
* just doesn't support stat()
*/
data->reqdata.size = -1;
data->reqdata.maxdownload = -1;
} else {
data->reqdata.size = attrs.filesize;
data->reqdata.maxdownload = attrs.filesize;
Curl_pgrsSetDownloadSize(data, attrs.filesize);
}
}
/* Setup the actual download */
result = Curl_setup_transfer(conn, FIRSTSOCKET, data->reqdata.size,
FALSE, NULL, -1, NULL);
if (result) {
state(conn, SSH_SFTP_CLOSE);
sshc->actualCode = result;
} else {
state(conn, SSH_STOP);
}
break;
case SSH_SFTP_CLOSE:
if (sftp_scp->sftp_handle) {
rc = libssh2_sftp_close(sftp_scp->sftp_handle);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc < 0) {
infof(data, "Failed to close libssh2 file\n");
}
sftp_scp->sftp_handle = NULL;
}
state(conn, SSH_SFTP_SHUTDOWN);
break;
case SSH_SFTP_SHUTDOWN:
if (sftp_scp->sftp_session) {
rc = libssh2_sftp_shutdown(sftp_scp->sftp_session);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc < 0) {
infof(data, "Failed to stop libssh2 sftp subsystem\n");
}
sftp_scp->sftp_session = NULL;
}
Curl_safefree(sftp_scp->path);
sftp_scp->path = NULL;
Curl_safefree(sftp_scp->homedir);
sftp_scp->homedir = NULL;
state(conn, SSH_CHANNEL_CLOSE);
break;
case SSH_SCP_TRANS_INIT:
if (data->set.upload) {
if (data->set.infilesize < 0) {
failf(data, "SCP requires a known file size for upload");
sshc->actualCode = CURLE_UPLOAD_FAILED;
state(conn, SSH_SCP_CHANNEL_FREE);
break;
}
state(conn, SSH_SCP_UPLOAD_INIT);
} else {
state(conn, SSH_SCP_DOWNLOAD_INIT);
}
break;
case SSH_SCP_UPLOAD_INIT:
/*
* libssh2 requires that the destination path is a full path that
* includes the destination file and name OR ends in a "/" . If this is
* not done the destination file will be named the same name as the last
* directory in the path.
*/
sftp_scp->ssh_channel =
libssh2_scp_send_ex(sftp_scp->ssh_session, sftp_scp->path,
data->set.new_file_perms,
data->set.infilesize, 0, 0);
if (!sftp_scp->ssh_channel) {
if (libssh2_session_last_errno(sftp_scp->ssh_session) ==
LIBSSH2_ERROR_EAGAIN) {
break;
} else {
int ssh_err;
char *err_msg;
ssh_err = libssh2_session_last_error(sftp_scp->ssh_session,
&err_msg, NULL, 0);
err = libssh2_session_error_to_CURLE(ssh_err);
failf(conn->data, "%s", err_msg);
state(conn, SSH_SCP_CHANNEL_FREE);
sshc->actualCode = err;
break;
}
}
/* upload data */
result = Curl_setup_transfer(conn, -1, data->reqdata.size, FALSE, NULL,
FIRSTSOCKET, NULL);
if (result) {
state(conn, SSH_SCP_CHANNEL_FREE);
sshc->actualCode = result;
} else {
state(conn, SSH_STOP);
}
break;
case SSH_SCP_DOWNLOAD_INIT:
{
/*
* We must check the remote file; if it is a directory no values will
* be set in sb
*/
struct stat sb;
curl_off_t bytecount;
memset(&sb, 0, sizeof(struct stat));
sftp_scp->ssh_channel = libssh2_scp_recv(sftp_scp->ssh_session,
sftp_scp->path, &sb);
if (!sftp_scp->ssh_channel) {
if (libssh2_session_last_errno(sftp_scp->ssh_session) ==
LIBSSH2_ERROR_EAGAIN) {
break;
} else {
int ssh_err;
char *err_msg;
ssh_err = libssh2_session_last_error(sftp_scp->ssh_session,
&err_msg, NULL, 0);
err = libssh2_session_error_to_CURLE(ssh_err);
failf(conn->data, "%s", err_msg);
state(conn, SSH_SCP_CHANNEL_FREE);
sshc->actualCode = err;
break;
}
}
/* download data */
bytecount = (curl_off_t)sb.st_size;
data->reqdata.maxdownload = (curl_off_t)sb.st_size;
result = Curl_setup_transfer(conn, FIRSTSOCKET,
bytecount, FALSE, NULL, -1, NULL);
if (result) {
state(conn, SSH_SCP_CHANNEL_FREE);
sshc->actualCode = result;
} else {
state(conn, SSH_STOP);
}
}
break;
case SSH_SCP_DONE:
if (data->set.upload) {
state(conn, SSH_SCP_SEND_EOF);
} else {
state(conn, SSH_SCP_CHANNEL_FREE);
}
break;
case SSH_SCP_SEND_EOF:
if (sftp_scp->ssh_channel) {
rc = libssh2_channel_send_eof(sftp_scp->ssh_channel);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc) {
infof(data, "Failed to send libssh2 channel EOF\n");
}
}
state(conn, SSH_SCP_WAIT_EOF);
break;
case SSH_SCP_WAIT_EOF:
if (sftp_scp->ssh_channel) {
rc = libssh2_channel_wait_eof(sftp_scp->ssh_channel);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc) {
infof(data, "Failed to get channel EOF\n");
}
}
state(conn, SSH_SCP_WAIT_CLOSE);
break;
case SSH_SCP_WAIT_CLOSE:
if (sftp_scp->ssh_channel) {
rc = libssh2_channel_wait_closed(sftp_scp->ssh_channel);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc) {
infof(data, "Channel failed to close\n");
}
}
state(conn, SSH_SCP_CHANNEL_FREE);
break;
case SSH_SCP_CHANNEL_FREE:
if (sftp_scp->ssh_channel) {
rc = libssh2_channel_free(sftp_scp->ssh_channel);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc < 0) {
infof(data, "Failed to free libssh2 scp subsystem\n");
}
sftp_scp->ssh_channel = NULL;
}
state(conn, SSH_SESSION_DISCONECT);
break;
case SSH_CHANNEL_CLOSE:
if (sftp_scp->ssh_channel) {
rc = libssh2_channel_close(sftp_scp->ssh_channel);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc < 0) {
infof(data, "Failed to stop libssh2 channel subsystem\n");
}
sftp_scp->ssh_channel = NULL;
}
state(conn, SSH_SESSION_DISCONECT);
break;
case SSH_SESSION_DISCONECT:
if (sftp_scp->ssh_session) {
rc = libssh2_session_disconnect(sftp_scp->ssh_session, "Shutdown");
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc < 0) {
infof(data, "Failed to disconnect libssh2 session\n");
}
}
Curl_safefree(sftp_scp->path);
sftp_scp->path = NULL;
Curl_safefree(sftp_scp->homedir);
sftp_scp->homedir = NULL;
state(conn, SSH_SESSION_FREE);
break;
case SSH_SESSION_FREE:
if (sftp_scp->ssh_session) {
rc = libssh2_session_free(sftp_scp->ssh_session);
if (rc == LIBSSH2_ERROR_EAGAIN) {
break;
}
else if (rc < 0) {
infof(data, "Failed to free libssh2 session\n");
}
sftp_scp->ssh_session = NULL;
}
sshc->nextState = SSH_NO_STATE;
state(conn, SSH_STOP);
result = sshc->actualCode;
break;
case SSH_QUIT:
/* fallthrough, just stop! */
default:
/* internal error */
sshc->nextState = SSH_NO_STATE;
state(conn, SSH_STOP);
break;
}
return result;
}
/* called repeatedly until done from multi.c */
CURLcode Curl_ssh_multi_statemach(struct connectdata *conn,
bool *done)
{
struct ssh_conn *sshc = &conn->proto.sshc;
CURLcode result = CURLE_OK;
result = ssh_statemach_act(conn);
*done = (bool)(sshc->state == SSH_STOP);
return result;
}
static CURLcode ssh_easy_statemach(struct connectdata *conn)
{
struct ssh_conn *sshc = &conn->proto.sshc;
CURLcode result = CURLE_OK;
while (sshc->state != SSH_STOP) {
result = ssh_statemach_act(conn);
if (result) {
break;
}
}
return result;
}
/*
* SSH setup and connection
*/
static CURLcode ssh_init(struct connectdata *conn)
{
struct SessionHandle *data = conn->data;
struct SSHPROTO *ssh;
if (data->reqdata.proto.ssh)
return CURLE_OK;
ssh = (struct SSHPROTO *)calloc(sizeof(struct SSHPROTO), 1);
if (!ssh)
return CURLE_OUT_OF_MEMORY;
data->reqdata.proto.ssh = ssh;
/* get some initial data into the ssh struct */
ssh->bytecountp = &data->reqdata.keep.bytecount;
/* no need to duplicate them, this connectdata struct won't change */
ssh->user = conn->user;
ssh->passwd = conn->passwd;
ssh->errorstr = NULL;
ssh->ssh_session = NULL;
ssh->ssh_channel = NULL;
ssh->sftp_session = NULL;
ssh->sftp_handle = NULL;
return CURLE_OK;
}
/*
* Curl_ssh_connect() gets called from Curl_protocol_connect() to allow us to
* do protocol-specific actions at connect-time.
*/
CURLcode Curl_ssh_connect(struct connectdata *conn, bool *done)
{
struct SSHPROTO *ssh;
curl_socket_t sock;
CURLcode result;
struct SessionHandle *data = conn->data;
result = ssh_init(conn);
if (result)
return result;
ssh = data->reqdata.proto.ssh;
#ifdef CURL_LIBSSH2_DEBUG
if (ssh->user) {
infof(data, "User: %s\n", ssh->user);
}
if (ssh->passwd) {
infof(data, "Password: %s\n", ssh->passwd);
}
#endif /* CURL_LIBSSH2_DEBUG */
sock = conn->sock[FIRSTSOCKET];
ssh->ssh_session = libssh2_session_init_ex(libssh2_malloc, libssh2_free,
libssh2_realloc, ssh);
if (ssh->ssh_session == NULL) {
failf(data, "Failure initialising ssh session");
return CURLE_FAILED_INIT;
}
#ifdef CURL_LIBSSH2_DEBUG
libssh2_trace(ssh->ssh_session, LIBSSH2_TRACE_CONN|LIBSSH2_TRACE_TRANS|
LIBSSH2_TRACE_KEX|LIBSSH2_TRACE_AUTH|LIBSSH2_TRACE_SCP|
LIBSSH2_TRACE_SFTP|LIBSSH2_TRACE_ERROR|
LIBSSH2_TRACE_PUBLICKEY);
infof(data, "SSH socket: %d\n", sock);
#endif /* CURL_LIBSSH2_DEBUG */
state(conn, SSH_S_STARTUP);
if (data->state.used_interface == Curl_if_multi)
result = Curl_ssh_multi_statemach(conn, done);
else {
result = ssh_easy_statemach(conn);
if (!result)
*done = TRUE;
}
return result;
}
/*
***********************************************************************
*
* scp_perform()
*
* This is the actual DO function for SCP. Get a file according to
* the options previously setup.
*/
static
CURLcode scp_perform(struct connectdata *conn,
bool *connected,
bool *dophase_done)
{
CURLcode result = CURLE_OK;
DEBUGF(infof(conn->data, "DO phase starts\n"));
*dophase_done = FALSE; /* not done yet */
/* start the first command in the DO phase */
state(conn, SSH_SCP_TRANS_INIT);
/* run the state-machine */
if (conn->data->state.used_interface == Curl_if_multi) {
result = Curl_ssh_multi_statemach(conn, dophase_done);
} else {
result = ssh_easy_statemach(conn);
*dophase_done = TRUE; /* with the easy interface we are done here */
}
*connected = conn->bits.tcpconnect;
if (*dophase_done) {
DEBUGF(infof(conn->data, "DO phase is complete\n"));
}
return result;
}
/* called from multi.c while DOing */
CURLcode Curl_scp_doing(struct connectdata *conn,
bool *dophase_done)
{
CURLcode result;
result = Curl_ssh_multi_statemach(conn, dophase_done);
if (*dophase_done) {
DEBUGF(infof(conn->data, "DO phase is complete\n"));
}
return result;
}
CURLcode Curl_scp_do(struct connectdata *conn, bool *done)
{
CURLcode res;
bool connected = 0;
struct SessionHandle *data = conn->data;
*done = FALSE; /* default to false */
/*
* Since connections can be re-used between SessionHandles, this might be a
* connection already existing but on a fresh SessionHandle struct so we must
* make sure we have a good 'struct SSHPROTO' to play with. For new
* connections, the struct SSHPROTO is allocated and setup in the
* Curl_ssh_connect() function.
*/
res = ssh_init(conn);
if (res) {
return res;
}
data->reqdata.size = -1; /* make sure this is unknown at this point */
Curl_pgrsSetUploadCounter(data, 0);
Curl_pgrsSetDownloadCounter(data, 0);
Curl_pgrsSetUploadSize(data, 0);
Curl_pgrsSetDownloadSize(data, 0);
res = scp_perform(conn, &connected, done);
if (CURLE_OK == res) {
if (!done) {
/* the DO phase has not completed yet */
return CURLE_OK;
}
}
return res;
}
CURLcode Curl_scp_done(struct connectdata *conn, CURLcode status,
bool premature)
{
CURLcode result = CURLE_OK;
bool done = FALSE;
(void)premature; /* not used */
(void)status; /* unused */
if (status == CURLE_OK) {
state(conn, SSH_SCP_DONE);
/* run the state-machine */
if (conn->data->state.used_interface == Curl_if_multi) {
result = Curl_ssh_multi_statemach(conn, &done);
} else {
result = ssh_easy_statemach(conn);
done = TRUE;
}
} else {
result = status;
done = TRUE;
}
if (done) {
Curl_safefree(conn->data->reqdata.proto.ssh);
conn->data->reqdata.proto.ssh = NULL;
Curl_pgrsDone(conn);
}
return result;
}
/* return number of received (decrypted) bytes */
ssize_t Curl_scp_send(struct connectdata *conn, int sockindex,
void *mem, size_t len)
{
ssize_t nwrite;
/* libssh2_channel_write() returns int
*
* NOTE: we should not store nor rely on connection-related data to be
* in the SessionHandle struct
*/
nwrite = (ssize_t)
libssh2_channel_write(conn->data->reqdata.proto.ssh->ssh_channel,
mem, len);
if (nwrite == LIBSSH2_ERROR_EAGAIN)
return 0;
(void)sockindex;
return nwrite;
}
/*
* If the read would block (EWOULDBLOCK) we return -1. Otherwise we return
* a regular CURLcode value.
*/
ssize_t Curl_scp_recv(struct connectdata *conn, int sockindex,
char *mem, size_t len)
{
ssize_t nread;
(void)sockindex; /* we only support SCP on the fixed known primary socket */
/* libssh2_channel_read() returns int
*
* NOTE: we should not store nor rely on connection-related data to be
* in the SessionHandle struct
*/
nread = (ssize_t)
libssh2_channel_read(conn->data->reqdata.proto.ssh->ssh_channel,
mem, len);
return nread;
}
/*
* =============== SFTP ===============
*/
/*
***********************************************************************
*
* sftp_perform()
*
* This is the actual DO function for SFTP. Get a file/directory according to
* the options previously setup.
*/
static
CURLcode sftp_perform(struct connectdata *conn,
bool *connected,
bool *dophase_done)
{
CURLcode result = CURLE_OK;
DEBUGF(infof(conn->data, "DO phase starts\n"));
*dophase_done = FALSE; /* not done yet */
/* start the first command in the DO phase */
state(conn, SSH_SFTP_QUOTE_INIT);
/* run the state-machine */
if (conn->data->state.used_interface == Curl_if_multi) {
result = Curl_ssh_multi_statemach(conn, dophase_done);
} else {
result = ssh_easy_statemach(conn);
*dophase_done = TRUE; /* with the easy interface we are done here */
}
*connected = conn->bits.tcpconnect;
if (*dophase_done) {
DEBUGF(infof(conn->data, "DO phase is complete\n"));
}
return result;
}
/* called from multi.c while DOing */
CURLcode Curl_sftp_doing(struct connectdata *conn,
bool *dophase_done)
{
CURLcode result;
result = Curl_ssh_multi_statemach(conn, dophase_done);
if (*dophase_done) {
DEBUGF(infof(conn->data, "DO phase is complete\n"));
}
return result;
}
CURLcode Curl_sftp_do(struct connectdata *conn, bool *done)
{
CURLcode res;
bool connected = 0;
struct SessionHandle *data = conn->data;
*done = FALSE; /* default to false */
/*
* Since connections can be re-used between SessionHandles, this might be a
* connection already existing but on a fresh SessionHandle struct so we must
* make sure we have a good 'struct SSHPROTO' to play with. For new
* connections, the struct SSHPROTO is allocated and setup in the
* Curl_ssh_connect() function.
*/
res = ssh_init(conn);
if (res) {
return res;
}
data->reqdata.size = -1; /* make sure this is unknown at this point */
Curl_pgrsSetUploadCounter(data, 0);
Curl_pgrsSetDownloadCounter(data, 0);
Curl_pgrsSetUploadSize(data, 0);
Curl_pgrsSetDownloadSize(data, 0);
res = sftp_perform(conn, &connected, done);
if (CURLE_OK == res) {
if (!done) {
/* the DO phase has not completed yet */
return CURLE_OK;
}
}
return res;
}
CURLcode Curl_sftp_done(struct connectdata *conn, CURLcode status,
bool premature)
{
CURLcode result = CURLE_OK;
bool done = FALSE;
struct ssh_conn *sshc = &conn->proto.sshc;
(void)status; /* unused */
if (status == CURLE_OK) {
/* Before we shut down, see if there are any post-quote commands to send: */
if (!status && !premature && conn->data->set.postquote) {
sshc->nextState = SSH_SFTP_CLOSE;
state(conn, SSH_SFTP_POSTQUOTE_INIT);
} else {
state(conn, SSH_SFTP_CLOSE);
}
/* run the state-machine */
if (conn->data->state.used_interface == Curl_if_multi) {
result = Curl_ssh_multi_statemach(conn, &done);
} else {
result = ssh_easy_statemach(conn);
done = TRUE;
}
} else {
result = status;
done = TRUE;
}
if (done) {
Curl_safefree(conn->data->reqdata.proto.ssh);
conn->data->reqdata.proto.ssh = NULL;
Curl_pgrsDone(conn);
}
return result;
}
/* return number of received (decrypted) bytes */
ssize_t Curl_sftp_send(struct connectdata *conn, int sockindex,
void *mem, size_t len)
{
ssize_t nwrite; /* libssh2_sftp_write() used to return size_t in 0.14
but is changed to ssize_t in 0.15! */
nwrite = (ssize_t)
libssh2_sftp_write(conn->data->reqdata.proto.ssh->sftp_handle, mem, len);
if (nwrite == LIBSSH2_ERROR_EAGAIN)
return 0;
(void)sockindex;
return nwrite;
}
/*
* If the read would block (EWOULDBLOCK) we return -1. Otherwise we return
* a regular CURLcode value.
*/
ssize_t Curl_sftp_recv(struct connectdata *conn, int sockindex,
char *mem, size_t len)
{
ssize_t nread;
(void)sockindex;
/* libssh2_sftp_read() returns size_t !*/
nread = (ssize_t)
libssh2_sftp_read(conn->data->reqdata.proto.ssh->sftp_handle, mem, len);
return nread;
}
/* The get_pathname() function is being borrowed from OpenSSH sftp.c
version 4.6p1. */
/*
* Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
static int
get_pathname(const char **cpp, char **path)
{
const char *cp = *cpp, *end;
char quot;
u_int i, j;
static const char * const WHITESPACE = " \t\r\n";
cp += strspn(cp, WHITESPACE);
if (!*cp) {
*cpp = cp;
*path = NULL;
return CURLE_QUOTE_ERROR;
}
*path = malloc(strlen(cp) + 1);
if (*path == NULL)
return CURLE_OUT_OF_MEMORY;
/* Check for quoted filenames */
if (*cp == '\"' || *cp == '\'') {
quot = *cp++;
/* Search for terminating quote, unescape some chars */
for (i = j = 0; i <= strlen(cp); i++) {
if (cp[i] == quot) { /* Found quote */
i++;
(*path)[j] = '\0';
break;
}
if (cp[i] == '\0') { /* End of string */
/*error("Unterminated quote");*/
goto fail;
}
if (cp[i] == '\\') { /* Escaped characters */
i++;
if (cp[i] != '\'' && cp[i] != '\"' &&
cp[i] != '\\') {
/*error("Bad escaped character '\\%c'",
cp[i]);*/
goto fail;
}
}
(*path)[j++] = cp[i];
}
if (j == 0) {
/*error("Empty quotes");*/
goto fail;
}
*cpp = cp + i + strspn(cp + i, WHITESPACE);
}
else {
/* Read to end of filename */
end = strpbrk(cp, WHITESPACE);
if (end == NULL)
end = strchr(cp, '\0');
*cpp = end + strspn(end, WHITESPACE);
memcpy(*path, cp, end - cp);
(*path)[end - cp] = '\0';
}
return (0);
fail:
Curl_safefree(*path);
*path = NULL;
return CURLE_QUOTE_ERROR;
}
static const char *sftp_libssh2_strerror(unsigned long err)
{
switch (err) {
case LIBSSH2_FX_NO_SUCH_FILE:
return "No such file or directory";
case LIBSSH2_FX_PERMISSION_DENIED:
return "Permission denied";
case LIBSSH2_FX_FAILURE:
return "Operation failed";
case LIBSSH2_FX_BAD_MESSAGE:
return "Bad message from SFTP server";
case LIBSSH2_FX_NO_CONNECTION:
return "Not connected to SFTP server";
case LIBSSH2_FX_CONNECTION_LOST:
return "Connection to SFTP server lost";
case LIBSSH2_FX_OP_UNSUPPORTED:
return "Operation not supported by SFTP server";
case LIBSSH2_FX_INVALID_HANDLE:
return "Invalid handle";
case LIBSSH2_FX_NO_SUCH_PATH:
return "No such file or directory";
case LIBSSH2_FX_FILE_ALREADY_EXISTS:
return "File already exists";
case LIBSSH2_FX_WRITE_PROTECT:
return "File is write protected";
case LIBSSH2_FX_NO_MEDIA:
return "No media";
case LIBSSH2_FX_NO_SPACE_ON_FILESYSTEM:
return "Disk full";
case LIBSSH2_FX_QUOTA_EXCEEDED:
return "User quota exceeded";
case LIBSSH2_FX_UNKNOWN_PRINCIPLE:
return "Unknown principle";
case LIBSSH2_FX_LOCK_CONFlICT:
return "File lock conflict";
case LIBSSH2_FX_DIR_NOT_EMPTY:
return "Directory not empty";
case LIBSSH2_FX_NOT_A_DIRECTORY:
return "Not a directory";
case LIBSSH2_FX_INVALID_FILENAME:
return "Invalid filename";
case LIBSSH2_FX_LINK_LOOP:
return "Link points to itself";
}
return "Unknown error in libssh2";
}
#endif /* USE_LIBSSH2 */
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