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putty/psftp.c

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45 KiB
C
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/*
* psftp.c: front end for PSFTP.
*/
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
#include <limits.h>
#define PUTTY_DO_GLOBALS
#include "putty.h"
#include "storage.h"
#include "ssh.h"
#include "sftp.h"
#include "int64.h"
/*
* Since SFTP is a request-response oriented protocol, it requires
* no buffer management: when we send data, we stop and wait for an
* acknowledgement _anyway_, and so we can't possibly overfill our
* send buffer.
*/
static int psftp_connect(char *userhost, char *user, int portnumber);
static int do_sftp_init(void);
/* ----------------------------------------------------------------------
* sftp client state.
*/
char *pwd, *homedir;
/* ----------------------------------------------------------------------
* Higher-level helper functions used in commands.
*/
/*
* 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 = dupstr(name);
} else {
char *slash;
if (pwd[strlen(pwd) - 1] == '/')
slash = "";
else
slash = "/";
fullname = dupcat(pwd, slash, name, NULL);
}
canonname = fxp_realpath(fullname);
if (canonname) {
sfree(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);
sfree(fullname);
sfree(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;
}
/* ----------------------------------------------------------------------
* Actual sftp commands.
*/
struct sftp_command {
char **words;
int nwords, wordssize;
int (*obey) (struct sftp_command *); /* returns <0 to quit */
};
int sftp_cmd_null(struct sftp_command *cmd)
{
return 1; /* success */
}
int sftp_cmd_unknown(struct sftp_command *cmd)
{
printf("psftp: unknown command \"%s\"\n", cmd->words[0]);
return 0; /* failure */
}
int sftp_cmd_quit(struct sftp_command *cmd)
{
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 (back == NULL) {
printf("psftp: not connected to a host; use \"open host.name\"\n");
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;
ournames =
srealloc(ournames, namesize * sizeof(*ournames));
}
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]);
}
sfree(ournames);
}
sfree(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 (back == NULL) {
printf("psftp: not connected to a host; use \"open host.name\"\n");
return 0;
}
if (cmd->nwords < 2)
dir = dupstr(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());
sfree(dir);
return 0;
}
fxp_close(dirh);
sfree(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 (back == NULL) {
printf("psftp: not connected to a host; use \"open host.name\"\n");
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;
char *fname, *outfname;
uint64 offset;
FILE *fp;
int ret;
if (back == NULL) {
printf("psftp: not connected to a host; use \"open host.name\"\n");
return 0;
}
if (cmd->nwords < 2) {
printf("get: expects a filename\n");
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());
sfree(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);
sfree(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);
/*
* FIXME: we can use FXP_FSTAT here to get the file size, and
* thus put up a progress bar.
*/
ret = 1;
while (1) {
char buffer[4096];
int len;
int wpos, wlen;
len = fxp_read(fh, buffer, offset, sizeof(buffer));
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) {
printf("error while writing local file\n");
ret = 0;
break;
}
wpos += wlen;
}
if (wpos < len) { /* we had an error */
ret = 0;
break;
}
offset = uint64_add32(offset, len);
}
fclose(fp);
fxp_close(fh);
sfree(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;
char *fname, *origoutfname, *outfname;
uint64 offset;
FILE *fp;
int ret;
if (back == NULL) {
printf("psftp: not connected to a host; use \"open host.name\"\n");
return 0;
}
if (cmd->nwords < 2) {
printf("put: expects a filename\n");
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);
sfree(outfname);
return 0;
}
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());
sfree(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());
sfree(outfname);
return 0;
}
if (!(attrs.flags & SSH_FILEXFER_ATTR_SIZE)) {
printf("read size of %s: size was not given\n", outfname);
sfree(outfname);
return 0;
}
offset = attrs.size;
uint64_decimal(offset, decbuf);
printf("reput: restarting at file position %s\n", decbuf);
if (uint64_compare(offset, uint64_make(0, LONG_MAX)) > 0) {
printf("reput: remote file is larger than we can deal with\n");
sfree(outfname);
return 0;
}
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);
/*
* FIXME: we can use FXP_FSTAT here to get the file size, and
* thus put up a progress bar.
*/
ret = 1;
while (1) {
char buffer[4096];
int len;
len = fread(buffer, 1, sizeof(buffer), fp);
if (len == -1) {
printf("error while reading local file\n");
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);
}
fxp_close(fh);
fclose(fp);
sfree(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 (back == NULL) {
printf("psftp: not connected to a host; use \"open host.name\"\n");
return 0;
}
if (cmd->nwords < 2) {
printf("mkdir: expects a directory\n");
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());
sfree(dir);
return 0;
}
sfree(dir);
return 1;
}
int sftp_cmd_rmdir(struct sftp_command *cmd)
{
char *dir;
int result;
if (back == NULL) {
printf("psftp: not connected to a host; use \"open host.name\"\n");
return 0;
}
if (cmd->nwords < 2) {
printf("rmdir: expects a directory\n");
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());
sfree(dir);
return 0;
}
sfree(dir);
return 1;
}
int sftp_cmd_rm(struct sftp_command *cmd)
{
char *fname;
int result;
if (back == NULL) {
printf("psftp: not connected to a host; use \"open host.name\"\n");
return 0;
}
if (cmd->nwords < 2) {
printf("rm: expects a filename\n");
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());
sfree(fname);
return 0;
}
sfree(fname);
return 1;
}
int sftp_cmd_mv(struct sftp_command *cmd)
{
char *srcfname, *dstfname;
int result;
if (back == NULL) {
printf("psftp: not connected to a host; use \"open host.name\"\n");
return 0;
}
if (cmd->nwords < 3) {
printf("mv: expects two filenames\n");
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);
sfree(newname);
if (newcanon) {
sfree(dstfname);
dstfname = newcanon;
result = fxp_rename(srcfname, dstfname);
error = result ? NULL : fxp_error();
}
}
if (error) {
printf("mv %s %s: %s\n", srcfname, dstfname, error);
sfree(srcfname);
sfree(dstfname);
return 0;
}
}
printf("%s -> %s\n", srcfname, dstfname);
sfree(srcfname);
sfree(dstfname);
return 1;
}
int sftp_cmd_chmod(struct sftp_command *cmd)
{
char *fname, *mode;
int result;
struct fxp_attrs attrs;
unsigned attrs_clr, attrs_xor, oldperms, newperms;
if (back == NULL) {
printf("psftp: not connected to a host; use \"open host.name\"\n");
return 0;
}
if (cmd->nwords < 3) {
printf("chmod: expects a mode specifier and a filename\n");
return 0;
}
/*
* Attempt to parse the mode specifier in cmd->words[1]. We
* don't support the full horror of Unix chmod; instead we
* support a much simpler syntax in which the user can either
* specify an octal number, or a comma-separated sequence of
* [ugoa]*[-+=][rwxst]+. (The initial [ugoa] sequence may
* _only_ be omitted if the only attribute mentioned is t,
* since all others require a user/group/other specification.
* Additionally, the s attribute may not be specified for any
* [ugoa] specifications other than exactly u or exactly g.
*/
attrs_clr = attrs_xor = 0;
mode = cmd->words[1];
if (mode[0] >= '0' && mode[0] <= '9') {
if (mode[strspn(mode, "01234567")]) {
printf("chmod: numeric file modes should"
" contain digits 0-7 only\n");
return 0;
}
attrs_clr = 07777;
sscanf(mode, "%o", &attrs_xor);
attrs_xor &= attrs_clr;
} else {
while (*mode) {
char *modebegin = mode;
unsigned subset, perms;
int action;
subset = 0;
while (*mode && *mode != ',' &&
*mode != '+' && *mode != '-' && *mode != '=') {
switch (*mode) {
case 'u': subset |= 04700; break; /* setuid, user perms */
case 'g': subset |= 02070; break; /* setgid, group perms */
case 'o': subset |= 00007; break; /* just other perms */
case 'a': subset |= 06777; break; /* all of the above */
default:
printf("chmod: file mode '%.*s' contains unrecognised"
" user/group/other specifier '%c'\n",
strcspn(modebegin, ","), modebegin, *mode);
return 0;
}
mode++;
}
if (!*mode || *mode == ',') {
printf("chmod: file mode '%.*s' is incomplete\n",
strcspn(modebegin, ","), modebegin);
return 0;
}
action = *mode++;
if (!*mode || *mode == ',') {
printf("chmod: file mode '%.*s' is incomplete\n",
strcspn(modebegin, ","), modebegin);
return 0;
}
perms = 0;
while (*mode && *mode != ',') {
switch (*mode) {
case 'r': perms |= 00444; break;
case 'w': perms |= 00222; break;
case 'x': perms |= 00111; break;
case 't': perms |= 01000; subset |= 01000; break;
case 's':
if ((subset & 06777) != 04700 &&
(subset & 06777) != 02070) {
printf("chmod: file mode '%.*s': set[ug]id bit should"
" be used with exactly one of u or g only\n",
strcspn(modebegin, ","), modebegin);
return 0;
}
perms |= 06000;
break;
default:
printf("chmod: file mode '%.*s' contains unrecognised"
" permission specifier '%c'\n",
strcspn(modebegin, ","), modebegin, *mode);
return 0;
}
mode++;
}
if (!(subset & 06777) && (perms &~ subset)) {
printf("chmod: file mode '%.*s' contains no user/group/other"
" specifier and permissions other than 't' \n",
strcspn(modebegin, ","), modebegin, *mode);
return 0;
}
perms &= subset;
switch (action) {
case '+':
attrs_clr |= perms;
attrs_xor |= perms;
break;
case '-':
attrs_clr |= perms;
attrs_xor &= ~perms;
break;
case '=':
attrs_clr |= subset;
attrs_xor |= perms;
break;
}
if (*mode) mode++; /* eat comma */
}
}
fname = canonify(cmd->words[2]);
if (!fname) {
printf("%s: %s\n", fname, fxp_error());
return 0;
}
result = fxp_stat(fname, &attrs);
if (!result || !(attrs.flags & SSH_FILEXFER_ATTR_PERMISSIONS)) {
printf("get attrs for %s: %s\n", fname,
result ? "file permissions not provided" : fxp_error());
sfree(fname);
return 0;
}
attrs.flags = SSH_FILEXFER_ATTR_PERMISSIONS; /* perms _only_ */
oldperms = attrs.permissions & 07777;
attrs.permissions &= ~attrs_clr;
attrs.permissions ^= attrs_xor;
newperms = attrs.permissions & 07777;
result = fxp_setstat(fname, attrs);
if (!result) {
printf("set attrs for %s: %s\n", fname, fxp_error());
sfree(fname);
return 0;
}
printf("%s: %04o -> %04o\n", fname, oldperms, newperms);
sfree(fname);
return 1;
}
static int sftp_cmd_open(struct sftp_command *cmd)
{
if (back != NULL) {
printf("psftp: already connected\n");
return 0;
}
if (cmd->nwords < 2) {
printf("open: expects a host name\n");
return 0;
}
if (psftp_connect(cmd->words[1], NULL, 0)) {
back = NULL; /* connection is already closed */
return -1; /* this is fatal */
}
do_sftp_init();
return 1;
}
static int sftp_cmd_lcd(struct sftp_command *cmd)
{
char *currdir;
int len;
if (cmd->nwords < 2) {
printf("lcd: expects a local directory name\n");
return 0;
}
if (!SetCurrentDirectory(cmd->words[1])) {
LPVOID message;
int i;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR)&message, 0, NULL);
i = strcspn((char *)message, "\n");
printf("lcd: unable to change directory: %.*s\n", i, (LPCTSTR)message);
LocalFree(message);
return 0;
}
currdir = smalloc(256);
len = GetCurrentDirectory(256, currdir);
if (len > 256)
currdir = srealloc(currdir, len);
GetCurrentDirectory(len, currdir);
printf("New local directory is %s\n", currdir);
sfree(currdir);
return 1;
}
static int sftp_cmd_lpwd(struct sftp_command *cmd)
{
char *currdir;
int len;
currdir = smalloc(256);
len = GetCurrentDirectory(256, currdir);
if (len > 256)
currdir = srealloc(currdir, len);
GetCurrentDirectory(len, currdir);
printf("Current local directory is %s\n", currdir);
sfree(currdir);
return 1;
}
static int sftp_cmd_pling(struct sftp_command *cmd)
{
int exitcode;
exitcode = system(cmd->words[1]);
return (exitcode == 0);
}
static int sftp_cmd_help(struct sftp_command *cmd);
static struct sftp_cmd_lookup {
char *name;
/*
* For help purposes, there are two kinds of command:
*
* - primary commands, in which `longhelp' is non-NULL. In
* this case `shorthelp' is descriptive text, and `longhelp'
* is longer descriptive text intended to be printed after
* the command name.
*
* - alias commands, in which `longhelp' is NULL. In this case
* `shorthelp' is the name of a primary command, which
* contains the help that should double up for this command.
*/
int listed; /* do we list this in primary help? */
char *shorthelp;
char *longhelp;
int (*obey) (struct sftp_command *);
} sftp_lookup[] = {
/*
* List of sftp commands. This is binary-searched so it MUST be
* in ASCII order.
*/
{
"!", TRUE, "run a local Windows command",
"<command>\n"
" Runs a local Windows command. For example, \"!del myfile\".\n",
sftp_cmd_pling
},
{
"bye", TRUE, "finish your SFTP session",
"\n"
" Terminates your SFTP session and quits the PSFTP program.\n",
sftp_cmd_quit
},
{
"cd", TRUE, "change your remote working directory",
" [ <New working directory> ]\n"
" Change the remote working directory for your SFTP session.\n"
" If a new working directory is not supplied, you will be\n"
" returned to your home directory.\n",
sftp_cmd_cd
},
{
"chmod", TRUE, "change file permissions and modes",
" ( <octal-digits> | <modifiers> ) <filename>\n"
" Change the file permissions on a file or directory.\n"
" <octal-digits> can be any octal Unix permission specifier.\n"
" Alternatively, <modifiers> can include:\n"
" u+r make file readable by owning user\n"
" u+w make file writable by owning user\n"
" u+x make file executable by owning user\n"
" u-r make file not readable by owning user\n"
" [also u-w, u-x]\n"
" g+r make file readable by members of owning group\n"
" [also g+w, g+x, g-r, g-w, g-x]\n"
" o+r make file readable by all other users\n"
" [also o+w, o+x, o-r, o-w, o-x]\n"
" a+r make file readable by absolutely everybody\n"
" [also a+w, a+x, a-r, a-w, a-x]\n"
" u+s enable the Unix set-user-ID bit\n"
" u-s disable the Unix set-user-ID bit\n"
" g+s enable the Unix set-group-ID bit\n"
" g-s disable the Unix set-group-ID bit\n"
" +t enable the Unix \"sticky bit\"\n"
" You can give more than one modifier for the same user (\"g-rwx\"), and\n"
" more than one user for the same modifier (\"ug+w\"). You can\n"
" use commas to separate different modifiers (\"u+rwx,g+s\").\n",
sftp_cmd_chmod
},
{
"del", TRUE, "delete a file",
" <filename>\n"
" Delete a file.\n",
sftp_cmd_rm
},
{
"delete", FALSE, "del", NULL, sftp_cmd_rm
},
{
"dir", TRUE, "list contents of a remote directory",
" [ <directory-name> ]\n"
" List the contents of a specified directory on the server.\n"
" If <directory-name> is not given, the current working directory\n"
" will be listed.\n",
sftp_cmd_ls
},
{
"exit", TRUE, "bye", NULL, sftp_cmd_quit
},
{
"get", TRUE, "download a file from the server to your local machine",
" <filename> [ <local-filename> ]\n"
" Downloads a file on the server and stores it locally under\n"
" the same name, or under a different one if you supply the\n"
" argument <local-filename>.\n",
sftp_cmd_get
},
{
"help", TRUE, "give help",
" [ <command> [ <command> ... ] ]\n"
" Give general help if no commands are specified.\n"
" If one or more commands are specified, give specific help on\n"
" those particular commands.\n",
sftp_cmd_help
},
{
"lcd", TRUE, "change local working directory",
" <local-directory-name>\n"
" Change the local working directory of the PSFTP program (the\n"
" default location where the \"get\" command will save files).\n",
sftp_cmd_lcd
},
{
"lpwd", TRUE, "print local working directory",
"\n"
" Print the local working directory of the PSFTP program (the\n"
" default location where the \"get\" command will save files).\n",
sftp_cmd_lpwd
},
{
"ls", TRUE, "dir", NULL,
sftp_cmd_ls
},
{
"mkdir", TRUE, "create a directory on the remote server",
" <directory-name>\n"
" Creates a directory with the given name on the server.\n",
sftp_cmd_mkdir
},
{
"mv", TRUE, "move or rename a file on the remote server",
" <source-filename> <destination-filename>\n"
" Moves or renames the file <source-filename> on the server,\n"
" so that it is accessible under the name <destination-filename>.\n",
sftp_cmd_mv
},
{
"open", TRUE, "connect to a host",
" [<user>@]<hostname>\n"
" Establishes an SFTP connection to a given host. Only usable\n"
" when you did not already specify a host name on the command\n"
" line.\n",
sftp_cmd_open
},
{
"put", TRUE, "upload a file from your local machine to the server",
" <filename> [ <remote-filename> ]\n"
" Uploads a file to the server and stores it there under\n"
" the same name, or under a different one if you supply the\n"
" argument <remote-filename>.\n",
sftp_cmd_put
},
{
"pwd", TRUE, "print your remote working directory",
"\n"
" Print the current remote working directory for your SFTP session.\n",
sftp_cmd_pwd
},
{
"quit", TRUE, "bye", NULL,
sftp_cmd_quit
},
{
"reget", TRUE, "continue downloading a file",
" <filename> [ <local-filename> ]\n"
" Works exactly like the \"get\" command, but the local file\n"
" must already exist. The download will begin at the end of the\n"
" file. This is for resuming a download that was interrupted.\n",
sftp_cmd_reget
},
{
"ren", TRUE, "mv", NULL,
sftp_cmd_mv
},
{
"rename", FALSE, "mv", NULL,
sftp_cmd_mv
},
{
"reput", TRUE, "continue uploading a file",
" <filename> [ <remote-filename> ]\n"
" Works exactly like the \"put\" command, but the remote file\n"
" must already exist. The upload will begin at the end of the\n"
" file. This is for resuming an upload that was interrupted.\n",
sftp_cmd_reput
},
{
"rm", TRUE, "del", NULL,
sftp_cmd_rm
},
{
"rmdir", TRUE, "remove a directory on the remote server",
" <directory-name>\n"
" Removes the directory with the given name on the server.\n"
" The directory will not be removed unless it is empty.\n",
sftp_cmd_rmdir
}
};
const struct sftp_cmd_lookup *lookup_command(char *name)
{
int i, j, k, cmp;
i = -1;
j = sizeof(sftp_lookup) / sizeof(*sftp_lookup);
while (j - i > 1) {
k = (j + i) / 2;
cmp = strcmp(name, sftp_lookup[k].name);
if (cmp < 0)
j = k;
else if (cmp > 0)
i = k;
else {
return &sftp_lookup[k];
}
}
return NULL;
}
static int sftp_cmd_help(struct sftp_command *cmd)
{
int i;
if (cmd->nwords == 1) {
/*
* Give short help on each command.
*/
int maxlen;
maxlen = 0;
for (i = 0; i < sizeof(sftp_lookup) / sizeof(*sftp_lookup); i++) {
int len;
if (!sftp_lookup[i].listed)
continue;
len = strlen(sftp_lookup[i].name);
if (maxlen < len)
maxlen = len;
}
for (i = 0; i < sizeof(sftp_lookup) / sizeof(*sftp_lookup); i++) {
const struct sftp_cmd_lookup *lookup;
if (!sftp_lookup[i].listed)
continue;
lookup = &sftp_lookup[i];
printf("%-*s", maxlen+2, lookup->name);
if (lookup->longhelp == NULL)
lookup = lookup_command(lookup->shorthelp);
printf("%s\n", lookup->shorthelp);
}
} else {
/*
* Give long help on specific commands.
*/
for (i = 1; i < cmd->nwords; i++) {
const struct sftp_cmd_lookup *lookup;
lookup = lookup_command(cmd->words[i]);
if (!lookup) {
printf("help: %s: command not found\n", cmd->words[i]);
} else {
printf("%s", lookup->name);
if (lookup->longhelp == NULL)
lookup = lookup_command(lookup->shorthelp);
printf("%s", lookup->longhelp);
}
}
}
return 1;
}
/* ----------------------------------------------------------------------
* Command line reading and parsing.
*/
struct sftp_command *sftp_getcmd(FILE *fp, int mode, int modeflags)
{
char *line;
int linelen, linesize;
struct sftp_command *cmd;
char *p, *q, *r;
int quoting;
if ((mode == 0) || (modeflags & 1)) {
printf("psftp> ");
}
fflush(stdout);
cmd = smalloc(sizeof(struct sftp_command));
cmd->words = NULL;
cmd->nwords = 0;
cmd->wordssize = 0;
line = NULL;
linesize = linelen = 0;
while (1) {
int len;
char *ret;
linesize += 512;
line = srealloc(line, linesize);
ret = fgets(line + linelen, linesize - linelen, fp);
if (!ret || (linelen == 0 && line[0] == '\0')) {
cmd->obey = sftp_cmd_quit;
if ((mode == 0) || (modeflags & 1))
printf("quit\n");
return cmd; /* eof */
}
len = linelen + strlen(line + linelen);
linelen += len;
if (line[linelen - 1] == '\n') {
linelen--;
line[linelen] = '\0';
break;
}
}
if (modeflags & 1) {
printf("%s\n", line);
}
p = line;
while (*p && (*p == ' ' || *p == '\t'))
p++;
if (*p == '!') {
/*
* Special case: the ! command. This is always parsed as
* exactly two words: one containing the !, and the second
* containing everything else on the line.
*/
cmd->nwords = cmd->wordssize = 2;
cmd->words = srealloc(cmd->words, cmd->wordssize * sizeof(char *));
cmd->words[0] = "!";
cmd->words[1] = p+1;
} else {
/*
* Parse the command line into words. The syntax is:
* - double quotes are removed, but cause spaces within to be
* treated as non-separating.
* - a double-doublequote pair is a literal double quote, inside
* _or_ outside quotes. Like this:
*
* firstword "second word" "this has ""quotes"" in" and""this""
*
* becomes
*
* >firstword<
* >second word<
* >this has "quotes" in<
* >and"this"<
*/
while (*p) {
/* skip whitespace */
while (*p && (*p == ' ' || *p == '\t'))
p++;
/* mark start of word */
q = r = p; /* q sits at start, r writes word */
quoting = 0;
while (*p) {
if (!quoting && (*p == ' ' || *p == '\t'))
break; /* reached end of word */
else if (*p == '"' && p[1] == '"')
p += 2, *r++ = '"'; /* a literal quote */
else if (*p == '"')
p++, quoting = !quoting;
else
*r++ = *p++;
}
if (*p)
p++; /* skip over the whitespace */
*r = '\0';
if (cmd->nwords >= cmd->wordssize) {
cmd->wordssize = cmd->nwords + 16;
cmd->words =
srealloc(cmd->words, cmd->wordssize * sizeof(char *));
}
cmd->words[cmd->nwords++] = q;
}
}
/*
* Now parse the first word and assign a function.
*/
if (cmd->nwords == 0)
cmd->obey = sftp_cmd_null;
else {
const struct sftp_cmd_lookup *lookup;
lookup = lookup_command(cmd->words[0]);
if (!lookup)
cmd->obey = sftp_cmd_unknown;
else
cmd->obey = lookup->obey;
}
return cmd;
}
static int do_sftp_init(void)
{
/*
* Do protocol initialisation.
*/
if (!fxp_init()) {
fprintf(stderr,
"Fatal: unable to initialise SFTP: %s\n", fxp_error());
return 1; /* failure */
}
/*
* Find out where our home directory is.
*/
homedir = fxp_realpath(".");
if (!homedir) {
fprintf(stderr,
"Warning: failed to resolve home directory: %s\n",
fxp_error());
homedir = dupstr(".");
} else {
printf("Remote working directory is %s\n", homedir);
}
pwd = dupstr(homedir);
return 0;
}
void do_sftp(int mode, int modeflags, char *batchfile)
{
FILE *fp;
int ret;
/*
* Batch mode?
*/
if (mode == 0) {
/* ------------------------------------------------------------------
* Now we're ready to do Real Stuff.
*/
while (1) {
struct sftp_command *cmd;
cmd = sftp_getcmd(stdin, 0, 0);
if (!cmd)
break;
if (cmd->obey(cmd) < 0)
break;
}
} else {
fp = fopen(batchfile, "r");
if (!fp) {
printf("Fatal: unable to open %s\n", batchfile);
return;
}
while (1) {
struct sftp_command *cmd;
cmd = sftp_getcmd(fp, mode, modeflags);
if (!cmd)
break;
ret = cmd->obey(cmd);
if (ret < 0)
break;
if (ret == 0) {
if (!(modeflags & 2))
break;
}
}
fclose(fp);
}
}
/* ----------------------------------------------------------------------
* Dirty bits: integration with PuTTY.
*/
static int verbose = 0;
/*
* Print an error message and perform a fatal exit.
*/
void fatalbox(char *fmt, ...)
{
char str[0x100]; /* Make the size big enough */
va_list ap;
va_start(ap, fmt);
strcpy(str, "Fatal:");
vsprintf(str + strlen(str), fmt, ap);
va_end(ap);
strcat(str, "\n");
fputs(str, stderr);
cleanup_exit(1);
}
void connection_fatal(char *fmt, ...)
{
char str[0x100]; /* Make the size big enough */
va_list ap;
va_start(ap, fmt);
strcpy(str, "Fatal:");
vsprintf(str + strlen(str), fmt, ap);
va_end(ap);
strcat(str, "\n");
fputs(str, stderr);
cleanup_exit(1);
}
void ldisc_send(char *buf, int len, int interactive)
{
/*
* This is only here because of the calls to ldisc_send(NULL,
* 0) in ssh.c. Nothing in PSFTP actually needs to use the
* ldisc as an ldisc. So if we get called with any real data, I
* want to know about it.
*/
assert(len == 0);
}
/*
* Be told what socket we're supposed to be using.
*/
static SOCKET sftp_ssh_socket;
char *do_select(SOCKET skt, int startup)
{
if (startup)
sftp_ssh_socket = skt;
else
sftp_ssh_socket = INVALID_SOCKET;
return NULL;
}
extern int select_result(WPARAM, LPARAM);
/*
* Receive a block of data from the SSH link. Block until all data
* is available.
*
* To do this, we repeatedly call the SSH protocol module, with our
* own trap in from_backend() to catch the data that comes back. We
* do this until we have enough data.
*/
static unsigned char *outptr; /* where to put the data */
static unsigned outlen; /* how much data required */
static unsigned char *pending = NULL; /* any spare data */
static unsigned pendlen = 0, pendsize = 0; /* length and phys. size of buffer */
int from_backend(int is_stderr, char *data, int datalen)
{
unsigned char *p = (unsigned char *) data;
unsigned len = (unsigned) datalen;
assert(len > 0);
/*
* stderr data is just spouted to local stderr and otherwise
* ignored.
*/
if (is_stderr) {
fwrite(data, 1, len, stderr);
return 0;
}
/*
* If this is before the real session begins, just return.
*/
if (!outptr)
return 0;
if (outlen > 0) {
unsigned used = outlen;
if (used > len)
used = len;
memcpy(outptr, p, used);
outptr += used;
outlen -= used;
p += used;
len -= used;
}
if (len > 0) {
if (pendsize < pendlen + len) {
pendsize = pendlen + len + 4096;
pending = (pending ? srealloc(pending, pendsize) :
smalloc(pendsize));
if (!pending)
fatalbox("Out of memory");
}
memcpy(pending + pendlen, p, len);
pendlen += len;
}
return 0;
}
int sftp_recvdata(char *buf, int len)
{
outptr = (unsigned char *) buf;
outlen = len;
/*
* See if the pending-input block contains some of what we
* need.
*/
if (pendlen > 0) {
unsigned pendused = pendlen;
if (pendused > outlen)
pendused = outlen;
memcpy(outptr, pending, pendused);
memmove(pending, pending + pendused, pendlen - pendused);
outptr += pendused;
outlen -= pendused;
pendlen -= pendused;
if (pendlen == 0) {
pendsize = 0;
sfree(pending);
pending = NULL;
}
if (outlen == 0)
return 1;
}
while (outlen > 0) {
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(sftp_ssh_socket, &readfds);
if (select(1, &readfds, NULL, NULL, NULL) < 0)
return 0; /* doom */
select_result((WPARAM) sftp_ssh_socket, (LPARAM) FD_READ);
}
return 1;
}
int sftp_senddata(char *buf, int len)
{
back->send((unsigned char *) buf, len);
return 1;
}
/*
* Loop through the ssh connection and authentication process.
*/
static void ssh_sftp_init(void)
{
if (sftp_ssh_socket == INVALID_SOCKET)
return;
while (!back->sendok()) {
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(sftp_ssh_socket, &readfds);
if (select(1, &readfds, NULL, NULL, NULL) < 0)
return; /* doom */
select_result((WPARAM) sftp_ssh_socket, (LPARAM) FD_READ);
}
}
/*
* Initialize the Win$ock driver.
*/
static void init_winsock(void)
{
WORD winsock_ver;
WSADATA wsadata;
winsock_ver = MAKEWORD(1, 1);
if (WSAStartup(winsock_ver, &wsadata)) {
fprintf(stderr, "Unable to initialise WinSock");
cleanup_exit(1);
}
if (LOBYTE(wsadata.wVersion) != 1 || HIBYTE(wsadata.wVersion) != 1) {
fprintf(stderr, "WinSock version is incompatible with 1.1");
cleanup_exit(1);
}
}
/*
* Short description of parameters.
*/
static void usage(void)
{
printf("PuTTY Secure File Transfer (SFTP) client\n");
printf("%s\n", ver);
printf("Usage: psftp [options] user@host\n");
printf("Options:\n");
printf(" -b file use specified batchfile\n");
printf(" -bc output batchfile commands\n");
printf(" -be don't stop batchfile processing if errors\n");
printf(" -v show verbose messages\n");
printf(" -P port connect to specified port\n");
printf(" -pw passw login with specified password\n");
cleanup_exit(1);
}
/*
* Connect to a host.
*/
static int psftp_connect(char *userhost, char *user, int portnumber)
{
char *host, *realhost;
char *err;
/* Separate host and username */
host = userhost;
host = strrchr(host, '@');
if (host == NULL) {
host = userhost;
} else {
*host++ = '\0';
if (user) {
printf("psftp: multiple usernames specified; using \"%s\"\n",
user);
} else
user = userhost;
}
/* Try to load settings for this host */
do_defaults(host, &cfg);
if (cfg.host[0] == '\0') {
/* No settings for this host; use defaults */
do_defaults(NULL, &cfg);
strncpy(cfg.host, host, sizeof(cfg.host) - 1);
cfg.host[sizeof(cfg.host) - 1] = '\0';
cfg.port = 22;
}
/*
* Trim leading whitespace off the hostname if it's there.
*/
{
int space = strspn(cfg.host, " \t");
memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space);
}
/* See if host is of the form user@host */
if (cfg.host[0] != '\0') {
char *atsign = strchr(cfg.host, '@');
/* Make sure we're not overflowing the user field */
if (atsign) {
if (atsign - cfg.host < sizeof cfg.username) {
strncpy(cfg.username, cfg.host, atsign - cfg.host);
cfg.username[atsign - cfg.host] = '\0';
}
memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1));
}
}
/*
* Trim a colon suffix off the hostname if it's there.
*/
cfg.host[strcspn(cfg.host, ":")] = '\0';
/* Set username */
if (user != NULL && user[0] != '\0') {
strncpy(cfg.username, user, sizeof(cfg.username) - 1);
cfg.username[sizeof(cfg.username) - 1] = '\0';
}
if (!cfg.username[0]) {
printf("login as: ");
if (!fgets(cfg.username, sizeof(cfg.username), stdin)) {
fprintf(stderr, "psftp: aborting\n");
cleanup_exit(1);
} else {
int len = strlen(cfg.username);
if (cfg.username[len - 1] == '\n')
cfg.username[len - 1] = '\0';
}
}
if (cfg.protocol != PROT_SSH)
cfg.port = 22;
if (portnumber)
cfg.port = portnumber;
/* SFTP uses SSH2 by default always */
cfg.sshprot = 2;
/*
* Disable scary things which shouldn't be enabled for simple
* things like SCP and SFTP: agent forwarding, port forwarding,
* X forwarding.
*/
cfg.x11_forward = 0;
cfg.agentfwd = 0;
cfg.portfwd[0] = cfg.portfwd[1] = '\0';
/* Set up subsystem name. */
strcpy(cfg.remote_cmd, "sftp");
cfg.ssh_subsys = TRUE;
cfg.nopty = TRUE;
/*
* Set up fallback option, for SSH1 servers or servers with the
* sftp subsystem not enabled but the server binary installed
* in the usual place. We only support fallback on Unix
* systems, and we use a kludgy piece of shellery which should
* try to find sftp-server in various places (the obvious
* systemwide spots /usr/lib and /usr/local/lib, and then the
* user's PATH) and finally give up.
*
* test -x /usr/lib/sftp-server && exec /usr/lib/sftp-server
* test -x /usr/local/lib/sftp-server && exec /usr/local/lib/sftp-server
* exec sftp-server
*
* the idea being that this will attempt to use either of the
* obvious pathnames and then give up, and when it does give up
* it will print the preferred pathname in the error messages.
*/
cfg.remote_cmd_ptr2 =
"test -x /usr/lib/sftp-server && exec /usr/lib/sftp-server\n"
"test -x /usr/local/lib/sftp-server && exec /usr/local/lib/sftp-server\n"
"exec sftp-server";
cfg.ssh_subsys2 = FALSE;
back = &ssh_backend;
err = back->init(cfg.host, cfg.port, &realhost, 0);
if (err != NULL) {
fprintf(stderr, "ssh_init: %s\n", err);
return 1;
}
ssh_sftp_init();
if (verbose && realhost != NULL)
printf("Connected to %s\n", realhost);
return 0;
}
/*
* Main program. Parse arguments etc.
*/
int main(int argc, char *argv[])
{
int i;
int portnumber = 0;
char *userhost, *user;
int mode = 0;
int modeflags = 0;
char *batchfile = NULL;
flags = FLAG_STDERR | FLAG_INTERACTIVE;
ssh_get_line = &console_get_line;
init_winsock();
sk_init();
userhost = user = NULL;
for (i = 1; i < argc; i++) {
if (argv[i][0] != '-') {
if (userhost)
usage();
else
userhost = dupstr(argv[i]);
} else if (strcmp(argv[i], "-v") == 0) {
verbose = 1, flags |= FLAG_VERBOSE;
} else if (strcmp(argv[i], "-h") == 0 ||
strcmp(argv[i], "-?") == 0) {
usage();
} else if (strcmp(argv[i], "-l") == 0 && i + 1 < argc) {
user = argv[++i];
} else if (strcmp(argv[i], "-P") == 0 && i + 1 < argc) {
portnumber = atoi(argv[++i]);
} else if (strcmp(argv[i], "-pw") == 0 && i + 1 < argc) {
console_password = argv[++i];
} else if (strcmp(argv[i], "-b") == 0 && i + 1 < argc) {
mode = 1;
batchfile = argv[++i];
} else if (strcmp(argv[i], "-bc") == 0) {
modeflags = modeflags | 1;
} else if (strcmp(argv[i], "-batch") == 0) {
console_batch_mode = TRUE;
} else if (strcmp(argv[i], "-be") == 0) {
modeflags = modeflags | 2;
} else if (strcmp(argv[i], "--") == 0) {
i++;
break;
} else {
usage();
}
}
argc -= i;
argv += i;
back = NULL;
/*
* If a user@host string has already been provided, connect to
* it now.
*/
if (userhost) {
if (psftp_connect(userhost, user, portnumber))
return 1;
if (do_sftp_init())
return 1;
} else {
printf("psftp: no hostname specified; use \"open host.name\""
" to connect\n");
}
do_sftp(mode, modeflags, batchfile);
if (back != NULL && back->socket() != NULL) {
char ch;
back->special(TS_EOF);
sftp_recvdata(&ch, 1);
}
WSACleanup();
random_save_seed();
return 0;
}
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