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sftpdos.c
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/* sftpdos.c Copyright (c) 2000-2003 Nagy Daniel
*
* Most parts are taken from the PuTTY source.
*
* $Date: 2005/12/30 16:26:41 $
* $Revision: 1.6 $
*
* This module is the sftp frontend. Most parts are taken from
* the PuTTY source
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <string.h>
#include <stdarg.h>
#include <sys/stat.h>
#include <direct.h>
#include "tcp.h"
#include "channel.h"
#include "common.h"
#include "config.h"
#include "macros.h"
#include "sftp.h"
#include "ssh.h"
#include "transprt.h"
#include "version.h"
#include "negotiat.h"
#if defined (MEMWATCH)
#include "memwatch.h"
#endif
#define TRUE 1
#define FALSE 0
/* external functions */
SendFuncPtr SendPacket;
/* external structures, variables */
extern Packet pktin; /* incoming SSH2 packet */
extern Packet pktout; /* outgoing SSH2 packet */
extern char *RemoteClosed;
extern char *ConnectionClosed;
extern char *protocolerror;
/* global variables */
Config GlobalConfig; /* global configuration structure */
unsigned short Configuration; /* Configuration bits */
/* local variables */
static char *pwd, *homedir;
static char *RemoteHost = NULL;
static char *UserName = NULL;
static char *PassWord = NULL;
static char *KeyFile = NULL;
static unsigned short RemotePort = SSH_PORT;
static FILE *BatchFile = NULL;
/*
* Initialize global variables
*/
static void Config_Init(void)
{
SendPacket = SSH2_Channel_Send;
GlobalConfig.debugfile = NULL;
GlobalConfig.brailab = NULL;
Configuration = 0;
}
/*
* Progress meter
*/
static void progress(uint64 fsize, uint64 cursize)
{
unsigned short ratio, i;
if(fsize.lo < 0x8000000)
ratio = 32 * cursize.lo / fsize.lo;
else if(!fsize.lo)
ratio = 32;
else
ratio = 32 * (cursize.lo/32) / (fsize.lo/32);
i = 30 * ratio / 32;
cprintf("|%.*s%*s| %lu kB\r", i, "***********************************",
30 - i, "", cursize.lo/1024);
}
/*
* Start sftp subsystem on remote host
*/
static short SFTP_Start(void)
{
if(Configuration & VERBOSE_MODE)
puts("Starting SFTP subsystem");
SSH2_Channel_PktInit(SSH_MSG_CHANNEL_REQUEST);
SSH_putstring("subsystem");
SSH_putbool(1);
SSH_putstring("sftp");
SSH_pkt_send();
if(SSH2_Channel_Read(0))
return(1);
switch(pktin.type){
case SSH_MSG_CHANNEL_SUCCESS:
break;
case SSH_MSG_CHANNEL_FAILURE:
SSH_Disconnect(SSH_DISCONNECT_BY_APPLICATION, "Cannot run sftp subsystem");
return(1);
default:
SSH_Disconnect(SSH_DISCONNECT_PROTOCOL_ERROR, protocolerror);
return(1);
}
return(0);
}
/*
* Connect to a host
*/
static int SFTP_Connect(char *hostname, char *username,
char *password, char *keyfile)
{
/* connect to server */
TCPConnect(hostname, RemotePort);
SSH_Connect(username, password, keyfile);
/* Start SFTP subsystem */
if(SFTP_Start())
return(1);
return(0);
}
/*
* Allocate the concatenation of N strings.
* Terminate arg list with NULL.
*/
static char *dupcat(char *s1, ...)
{
int len;
char *p, *q, *sn;
va_list ap;
len = strlen(s1);
va_start(ap, s1);
while (1) {
sn = va_arg(ap, char *);
if (!sn)
break;
len += strlen(sn);
}
va_end(ap);
if((p = malloc(len + 1)) == NULL)
fatal("Memory allocation error. %s: %d", __FILE__, __LINE__);
strcpy(p, s1);
q = p + strlen(p);
va_start(ap, s1);
while (1) {
sn = va_arg(ap, char *);
if (!sn)
break;
strcpy(q, sn);
q += strlen(q);
}
va_end(ap);
return p;
}
/*
* Attempt to canonify a pathname starting from the pwd. If
* canonification fails, at least fall back to returning a _valid_
* pathname (though it may be ugly, eg /home/simon/../foobar).
*/
char *canonify(char *name)
{
char *fullname, *canonname;
if(name[0] == '/') {
fullname = strdup(name);
} else {
char *slash;
if(pwd[strlen(pwd) - 1] == '/')
slash = "";
else
slash = "/";
fullname = dupcat(pwd, slash, name, NULL);
}
canonname = fxp_realpath(fullname);
if(canonname) {
free(fullname);
return canonname;
} else {
/*
* Attempt number 2. Some FXP_REALPATH implementations
* (glibc-based ones, in particular) require the _whole_
* path to point to something that exists, whereas others
* (BSD-based) only require all but the last component to
* exist. So if the first call failed, we should strip off
* everything from the last slash onwards and try again,
* then put the final component back on.
*
* Special cases:
*
* - if the last component is "/." or "/..", then we don't
* bother trying this because there's no way it can work.
*
* - if the thing actually ends with a "/", we remove it
* before we start. Except if the string is "/" itself
* (although I can't see why we'd have got here if so,
* because surely "/" would have worked the first
* time?), in which case we don't bother.
*
* - if there's no slash in the string at all, give up in
* confusion (we expect at least one because of the way
* we constructed the string).
*/
int i;
char *returnname;
i = strlen(fullname);
if(i > 2 && fullname[i - 1] == '/')
fullname[--i] = '\0'; /* strip trailing / unless at pos 0 */
while (i > 0 && fullname[--i] != '/');
/*
* Give up on special cases.
*/
if(fullname[i] != '/' || /* no slash at all */
!strcmp(fullname + i, "/.") || /* ends in /. */
!strcmp(fullname + i, "/..") || /* ends in /.. */
!strcmp(fullname, "/")) {
return fullname;
}
/*
* Now i points at the slash. Deal with the final special
* case i==0 (ie the whole path was "/nonexistentfile").
*/
fullname[i] = '\0'; /* separate the string */
if(i == 0) {
canonname = fxp_realpath("/");
} else {
canonname = fxp_realpath(fullname);
}
if(!canonname)
return fullname; /* even that failed; give up */
/*
* We have a canonical name for all but the last path
* component. Concatenate the last component and return.
*/
returnname = dupcat(canonname,
canonname[strlen(canonname) - 1] ==
'/' ? "" : "/", fullname + i + 1, NULL);
free(fullname);
free(canonname);
return returnname;
}
}
/*
* Return a pointer to the portion of str that comes after the last
* slash (or backslash or colon, if `local' is TRUE).
*/
static char *stripslashes(char *str, int local)
{
char *p;
if(local) {
p = strchr(str, ':');
if(p) str = p+1;
}
p = strrchr(str, '/');
if(p) str = p+1;
if(local) {
p = strrchr(str, '\\');
if(p) str = p+1;
}
return str;
}
/*
* Close SSH and TCP connection if open and free compression memory
*/
static void CloseConnection(void)
{
if(Configuration & SFTP_CONNECTED){
SSH2_Channel_PktInit(SSH_MSG_CHANNEL_EOF); /* send EOF */
SSH_pkt_send();
SSH2_Channel_Read(SSH_MSG_CHANNEL_CLOSE);
sock_close(&GlobalConfig.s); /* Close TCP socket */
}
#if !defined (__386__)
if(Configuration & COMPRESSION_ENABLED)
Disable_Compression();
#endif
}
/* ----------------------------------------------------------------------
* Actual sftp commands.
*/
struct sftp_command {
char **words;
int nwords, wordssize;
int (*obey) (struct sftp_command *); /* returns <0 to quit */
};
static int sftp_cmd_null(struct sftp_command *cmd)
{
return 1; /* success */
}
static int sftp_cmd_unknown(struct sftp_command *cmd)
{
printf("sftp: unknown command \"%s\"\n", cmd->words[0]);
return 0; /* failure */
}
static int sftp_cmd_quit(struct sftp_command *cmd)
{
CloseConnection();
return -1;
}
/*
* List a directory. If no arguments are given, list pwd; otherwise
* list the directory given in words[1].
*/
static int sftp_ls_compare(const void *av, const void *bv)
{
const struct fxp_name *const *a = (const struct fxp_name *const *) av;
const struct fxp_name *const *b = (const struct fxp_name *const *) bv;
return strcmp((*a)->filename, (*b)->filename);
}
int sftp_cmd_ls(struct sftp_command *cmd)
{
struct fxp_handle *dirh;
struct fxp_names *names;
struct fxp_name **ournames;
int nnames, namesize;
char *dir, *cdir;
int i;
if(!(Configuration & SFTP_CONNECTED)){
puts("sftpdos: not connected, use \"open user@hostname\"");
return 0;
}
if(cmd->nwords < 2)
dir = ".";
else
dir = cmd->words[1];
cdir = canonify(dir);
if(!cdir) {
printf("%s: %s\n", dir, fxp_error());
return 0;
}
printf("Listing directory %s\n", cdir);
dirh = fxp_opendir(cdir);
if(dirh == NULL) {
printf("Unable to open %s: %s\n", dir, fxp_error());
} else {
nnames = namesize = 0;
ournames = NULL;
while (1) {
names = fxp_readdir(dirh);
if(names == NULL) {
if(fxp_error_type() == SSH_FX_EOF)
break;
printf("Reading directory %s: %s\n", dir, fxp_error());
break;
}
if(names->nnames == 0) {
fxp_free_names(names);
break;
}
if(nnames + names->nnames >= namesize) {
namesize += names->nnames + 128;
if((ournames = realloc(ournames, namesize * sizeof(*ournames))) == NULL)
fatal("Memory allocation error. %s: %d", __FILE__, __LINE__);
}
for(i = 0; i < names->nnames; i++)
ournames[nnames++] = fxp_dup_name(&names->names[i]);
fxp_free_names(names);
}
fxp_close(dirh);
/*
* Now we have our filenames. Sort them by actual file
* name, and then output the longname parts.
*/
qsort(ournames, nnames, sizeof(*ournames), sftp_ls_compare);
/*
* And print them.
*/
for(i = 0; i < nnames; i++) {
printf("%s\n", ournames[i]->longname);
fxp_free_name(ournames[i]);
}
free(ournames);
}
free(cdir);
return 1;
}
/*
* Change directories. We do this by canonifying the new name, then
* trying to OPENDIR it. Only if that succeeds do we set the new pwd.
*/
int sftp_cmd_cd(struct sftp_command *cmd)
{
struct fxp_handle *dirh;
char *dir;
if(!(Configuration & SFTP_CONNECTED)){
puts("sftpdos: not connected, use \"open user@hostname\"");
return 0;
}
if(cmd->nwords < 2)
dir = strdup(homedir);
else
dir = canonify(cmd->words[1]);
if(!dir) {
printf("%s: %s\n", dir, fxp_error());
return 0;
}
dirh = fxp_opendir(dir);
if(!dirh) {
printf("Directory %s: %s\n", dir, fxp_error());
free(dir);
return 0;
}
fxp_close(dirh);
free(pwd);
pwd = dir;
printf("Remote directory is now %s\n", pwd);
return 1;
}
/*
* Print current directory. Easy as pie.
*/
int sftp_cmd_pwd(struct sftp_command *cmd)
{
if(!(Configuration & SFTP_CONNECTED)){
puts("sftpdos: not connected, use \"open user@hostname\"");
return 0;
}
printf("Remote directory is %s\n", pwd);
return 1;
}
/*
* Get a file and save it at the local end. We have two very
* similar commands here: `get' and `reget', which differ in that
* `reget' checks for the existence of the destination file and
* starts from where a previous aborted transfer left off.
*/
int sftp_general_get(struct sftp_command *cmd, int restart)
{
struct fxp_handle *fh;
struct fxp_attrs fa;
char *fname, *outfname, *buffer;
uint64 offset;
FILE *fp;
int ret;
if(!(Configuration & SFTP_CONNECTED)){
puts("sftpdos: not connected, use \"open user@hostname\"");
return 0;
}
if(cmd->nwords < 2) {
puts("get: expects a filename");
return 0;
}
fname = canonify(cmd->words[1]);
if(!fname) {
printf("%s: %s\n", cmd->words[1], fxp_error());
return 0;
}
outfname = (cmd->nwords == 2 ?
stripslashes(cmd->words[1], 0) : cmd->words[2]);
fh = fxp_open(fname, SSH_FXF_READ);
if(!fh) {
printf("%s: %s\n", fname, fxp_error());
free(fname);
return 0;
}
if(restart) {
fp = fopen(outfname, "rb+");
} else {
fp = fopen(outfname, "wb");
}
if(!fp) {
printf("local: unable to open %s\n", outfname);
fxp_close(fh);
free(fname);
return 0;
}
if(restart) {
long posn;
fseek(fp, 0L, SEEK_END);
posn = ftell(fp);
printf("reget: restarting at file position %ld\n", posn);
offset = uint64_make(0, posn);
} else {
offset = uint64_make(0, 0);
}
printf("remote:%s => local:%s\n", fname, outfname);
fxp_fstat(fh, &fa);
ret = 1;
if((buffer = malloc(TRANSBUF_SIZE)) == NULL)
fatal("Memory allocation error. %s: %d", __FILE__, __LINE__);
while (1) {
int len;
int wpos, wlen;
len = fxp_read(fh, buffer, offset, TRANSBUF_SIZE);
if((len == -1 && fxp_error_type() == SSH_FX_EOF) || len == 0)
break;
if(len == -1) {
printf("error while reading: %s\n", fxp_error());
ret = 0;
break;
}
wpos = 0;
while (wpos < len) {
wlen = fwrite(buffer, 1, len - wpos, fp);
if(wlen <= 0) {
puts("error while writing local file");
ret = 0;
break;
}
wpos += wlen;
}
if(wpos < len) { /* we had an error */
ret = 0;
break;
}
offset = uint64_add32(offset, len);
if(!(Configuration & QUIET_MODE))
progress(fa.size, offset);
}
free(buffer);
if(!(Configuration & QUIET_MODE))
cputs("\r\n");
fclose(fp);
fxp_close(fh);
free(fname);
return ret;
}
int sftp_cmd_get(struct sftp_command *cmd)
{
return sftp_general_get(cmd, 0);
}
int sftp_cmd_reget(struct sftp_command *cmd)
{
return sftp_general_get(cmd, 1);
}
/*
* Send a file and store it at the remote end. We have two very
* similar commands here: `put' and `reput', which differ in that
* `reput' checks for the existence of the destination file and
* starts from where a previous aborted transfer left off.
*/
int sftp_general_put(struct sftp_command *cmd, int restart)
{
struct fxp_handle *fh;
struct stat fa;
char *fname, *origoutfname, *outfname, *buffer;
uint64 localsize, offset;
FILE *fp;
int ret;
if(!(Configuration & SFTP_CONNECTED)){
puts("sftpdos: not connected, use \"open user@hostname\"");
return 0;
}
if(cmd->nwords < 2) {
puts("put: expects a filename");
return 0;
}
fname = cmd->words[1];
origoutfname = (cmd->nwords == 2 ?
stripslashes(cmd->words[1], 1) : cmd->words[2]);
outfname = canonify(origoutfname);
if(!outfname) {
printf("%s: %s\n", origoutfname, fxp_error());
return 0;
}
fp = fopen(fname, "rb");
if(!fp) {
printf("local: unable to open %s\n", fname);
free(outfname);
return 0;
}
fstat(fileno(fp), &fa);
localsize = uint64_make(0, fa.st_size);
if(restart) {
fh = fxp_open(outfname,
SSH_FXF_WRITE);
} else {
fh = fxp_open(outfname,
SSH_FXF_WRITE | SSH_FXF_CREAT | SSH_FXF_TRUNC);
}
if(!fh) {
printf("%s: %s\n", outfname, fxp_error());
free(outfname);
return 0;
}
if(restart) {
char decbuf[30];
struct fxp_attrs attrs;
if(!fxp_fstat(fh, &attrs)) {
printf("read size of %s: %s\n", outfname, fxp_error());
free(outfname);
return 0;
}
if(!(attrs.flags & SSH_FILEXFER_ATTR_SIZE)) {
printf("read size of %s: size was not given\n", outfname);
free(outfname);
return 0;
}
offset = attrs.size;
uint64_decimal(offset, decbuf);
printf("reput: restarting at file position %s\n", decbuf);
if(fseek(fp, offset.lo, SEEK_SET) != 0)
fseek(fp, 0, SEEK_END); /* *shrug* */
} else {
offset = uint64_make(0, 0);
}
printf("local:%s => remote:%s\n", fname, outfname);
ret = 1;
if((buffer = malloc(TRANSBUF_SIZE)) == NULL)
fatal("Memory allocation error. %s: %d", __FILE__, __LINE__);
while (1) {
int len;
len = fread(buffer, 1, TRANSBUF_SIZE, fp);
if(len == -1) {
puts("error while reading local file");
ret = 0;
break;
} else if(len == 0) {
break;
}
if(!fxp_write(fh, buffer, offset, len)) {
printf("error while writing: %s\n", fxp_error());
ret = 0;
break;
}
offset = uint64_add32(offset, len);
if(!(Configuration & QUIET_MODE))
progress(localsize, offset);
}
free(buffer);
if(!(Configuration & QUIET_MODE))
cputs("\r\n");
fxp_close(fh);
fclose(fp);
free(outfname);
return ret;
}
int sftp_cmd_put(struct sftp_command *cmd)
{
return sftp_general_put(cmd, 0);
}
int sftp_cmd_reput(struct sftp_command *cmd)
{
return sftp_general_put(cmd, 1);
}
int sftp_cmd_mkdir(struct sftp_command *cmd)
{
char *dir;
int result;
if(!(Configuration & SFTP_CONNECTED)){
puts("sftpdos: not connected, use \"open user@hostname\"");
return 0;
}
if(cmd->nwords < 2) {
puts("mkdir: expects a directory");
return 0;
}
dir = canonify(cmd->words[1]);
if(!dir) {
printf("%s: %s\n", dir, fxp_error());
return 0;
}
result = fxp_mkdir(dir);
if(!result) {
printf("mkdir %s: %s\n", dir, fxp_error());
free(dir);
return 0;
}
free(dir);
return 1;
}
int sftp_cmd_rmdir(struct sftp_command *cmd)
{
char *dir;
int result;
if(!(Configuration & SFTP_CONNECTED)){
puts("sftpdos: not connected, use \"open user@hostname\"");
return 0;
}
if(cmd->nwords < 2) {
puts("rmdir: expects a directory");
return 0;
}
dir = canonify(cmd->words[1]);
if(!dir) {
printf("%s: %s\n", dir, fxp_error());
return 0;
}
result = fxp_rmdir(dir);
if(!result) {
printf("rmdir %s: %s\n", dir, fxp_error());
free(dir);
return 0;
}
free(dir);
return 1;
}
int sftp_cmd_rm(struct sftp_command *cmd)
{
char *fname;
int result;
if(!(Configuration & SFTP_CONNECTED)){
puts("sftpdos: not connected, use \"open user@hostname\"");
return 0;
}
if(cmd->nwords < 2) {
puts("rm: expects a filename");
return 0;
}
fname = canonify(cmd->words[1]);
if(!fname) {
printf("%s: %s\n", fname, fxp_error());
return 0;
}
result = fxp_remove(fname);
if(!result) {
printf("rm %s: %s\n", fname, fxp_error());
free(fname);
return 0;
}
free(fname);
return 1;
}
int sftp_cmd_mv(struct sftp_command *cmd)
{
char *srcfname, *dstfname;
int result;
if(!(Configuration & SFTP_CONNECTED)){
puts("sftpdos: not connected, use \"open user@hostname\"");
return 0;
}
if(cmd->nwords < 3) {
puts("mv: expects two filenames");
return 0;
}
srcfname = canonify(cmd->words[1]);
if(!srcfname) {
printf("%s: %s\n", srcfname, fxp_error());
return 0;
}
dstfname = canonify(cmd->words[2]);
if(!dstfname) {
printf("%s: %s\n", dstfname, fxp_error());
return 0;
}
result = fxp_rename(srcfname, dstfname);
if(!result) {
char const *error = fxp_error();
struct fxp_attrs attrs;
/*
* The move might have failed because dstfname pointed at a
* directory. We check this possibility now: if dstfname
* _is_ a directory, we re-attempt the move by appending
* the basename of srcfname to dstfname.
*/
result = fxp_stat(dstfname, &attrs);
if(result &&
(attrs.flags & SSH_FILEXFER_ATTR_PERMISSIONS) &&
(attrs.permissions & 0040000)) {
char *p;
char *newname, *newcanon;
printf("(destination %s is a directory)\n", dstfname);
p = srcfname + strlen(srcfname);
while (p > srcfname && p[-1] != '/') p--;
newname = dupcat(dstfname, "/", p, NULL);
newcanon = canonify(newname);
free(newname);
if(newcanon) {
free(dstfname);
dstfname = newcanon;
result = fxp_rename(srcfname, dstfname);
error = result ? NULL : fxp_error();
}
}
if(error) {
printf("mv %s %s: %s\n", srcfname, dstfname, error);
free(srcfname);
free(dstfname);
return 0;
}
}
printf("%s -> %s\n", srcfname, dstfname);
free(srcfname);
free(dstfname);
return 1;
}
static int SFTP_Init(void)
{
/*
* Do protocol initialisation.
*/
if(!fxp_init()) {
printf("Unable to initialize SFTP: %s\n", fxp_error());
return 1; /* failure */
}
/*
* Find out where our home directory is.
*/
homedir = fxp_realpath(".");
if(!homedir) {
printf("Warning: failed to resolve home directory: %s\n",
fxp_error());
homedir = strdup(".");
} else {
printf("Remote working directory is %s\n", homedir);
}
pwd = strdup(homedir);
return 0;
}
static int sftp_cmd_open(struct sftp_command *cmd)
{
char *s;
if(Configuration & SFTP_CONNECTED){
puts("sftpdos: already connected");
return 0;
}
if(cmd->nwords < 2) {
puts("open: expects a user@host name");
return 0;
}
if((s = strchr(cmd->words[1], '@')) == NULL){
puts("open: expects a user@host name");
return 0;
}
*s++ = '\0';
if(SFTP_Connect(s, cmd->words[1], NULL, NULL))
return 0;
if(SFTP_Init())
return 0;
Configuration += SFTP_CONNECTED;
return 1;
}
static int sftp_cmd_close(struct sftp_command *cmd)
{
if(!(Configuration & SFTP_CONNECTED)){
puts("sftpdos: no connection");
return 0;
}
CloseConnection();
Configuration -= CIPHER_ENABLED;
Configuration -= COMPRESSION_ENABLED;
Configuration -= SFTP_CONNECTED;
return 1;
}
static int sftp_cmd_lcd(struct sftp_command *cmd)
{
char *currdir;
if(cmd->nwords < 2) {
puts("lcd: expects a local directory name");
return 0;
}
chdir(cmd->words[1]);
if((currdir = malloc(256)) == NULL)
fatal("Memory allocation error. %s: %d", __FILE__, __LINE__);
getcwd(currdir, 256);