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putty/windows/winsftp.c

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C
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/*
* winsftp.c: the Windows-specific parts of PSFTP and PSCP.
*/
#include <assert.h>
#include "putty.h"
#include "psftp.h"
/* ----------------------------------------------------------------------
* Interface to GUI driver program.
*/
/* This is just a base value from which the main message numbers are
* derived. */
#define WM_APP_BASE 0x8000
/* These two pass a single character value in wParam. They represent
* the visible output from PSCP. */
#define WM_STD_OUT_CHAR ( WM_APP_BASE+400 )
#define WM_STD_ERR_CHAR ( WM_APP_BASE+401 )
/* These pass a transfer status update. WM_STATS_CHAR passes a single
* character in wParam, and is called repeatedly to pass the name of
* the file, terminated with "\n". WM_STATS_SIZE passes the size of
* the file being transferred in wParam. WM_STATS_ELAPSED is called
* to pass the elapsed time (in seconds) in wParam, and
* WM_STATS_PERCENT passes the percentage of the transfer which is
* complete, also in wParam. */
#define WM_STATS_CHAR ( WM_APP_BASE+402 )
#define WM_STATS_SIZE ( WM_APP_BASE+403 )
#define WM_STATS_PERCENT ( WM_APP_BASE+404 )
#define WM_STATS_ELAPSED ( WM_APP_BASE+405 )
/* These are used at the end of a run to pass an error code in
* wParam: zero means success, nonzero means failure. WM_RET_ERR_CNT
* is used after a copy, and WM_LS_RET_ERR_CNT is used after a file
* list operation. */
#define WM_RET_ERR_CNT ( WM_APP_BASE+406 )
#define WM_LS_RET_ERR_CNT ( WM_APP_BASE+407 )
/* More transfer status update messages. WM_STATS_DONE passes the
* number of bytes sent so far in wParam. WM_STATS_ETA passes the
* estimated time to completion (in seconds). WM_STATS_RATEBS passes
* the average transfer rate (in bytes per second). */
#define WM_STATS_DONE ( WM_APP_BASE+408 )
#define WM_STATS_ETA ( WM_APP_BASE+409 )
#define WM_STATS_RATEBS ( WM_APP_BASE+410 )
#define NAME_STR_MAX 2048
static char statname[NAME_STR_MAX + 1];
static unsigned long statsize = 0;
static unsigned long statdone = 0;
static unsigned long stateta = 0;
static unsigned long statratebs = 0;
static int statperct = 0;
static unsigned long statelapsed = 0;
static HWND gui_hwnd = NULL;
static void send_msg(HWND h, UINT message, WPARAM wParam)
{
while (!PostMessage(h, message, wParam, 0))
SleepEx(1000, TRUE);
}
void gui_send_char(int is_stderr, int c)
{
unsigned int msg_id = WM_STD_OUT_CHAR;
if (is_stderr)
msg_id = WM_STD_ERR_CHAR;
send_msg(gui_hwnd, msg_id, (WPARAM) c);
}
void gui_send_errcount(int list, int errs)
{
unsigned int msg_id = WM_RET_ERR_CNT;
if (list)
msg_id = WM_LS_RET_ERR_CNT;
while (!PostMessage(gui_hwnd, msg_id, (WPARAM) errs, 0))
SleepEx(1000, TRUE);
}
void gui_update_stats(char *name, unsigned long size,
int percentage, unsigned long elapsed,
unsigned long done, unsigned long eta,
unsigned long ratebs)
{
unsigned int i;
if (strcmp(name, statname) != 0) {
for (i = 0; i < strlen(name); ++i)
send_msg(gui_hwnd, WM_STATS_CHAR, (WPARAM) name[i]);
send_msg(gui_hwnd, WM_STATS_CHAR, (WPARAM) '\n');
strcpy(statname, name);
}
if (statsize != size) {
send_msg(gui_hwnd, WM_STATS_SIZE, (WPARAM) size);
statsize = size;
}
if (statdone != done) {
send_msg(gui_hwnd, WM_STATS_DONE, (WPARAM) done);
statdone = done;
}
if (stateta != eta) {
send_msg(gui_hwnd, WM_STATS_ETA, (WPARAM) eta);
stateta = eta;
}
if (statratebs != ratebs) {
send_msg(gui_hwnd, WM_STATS_RATEBS, (WPARAM) ratebs);
statratebs = ratebs;
}
if (statelapsed != elapsed) {
send_msg(gui_hwnd, WM_STATS_ELAPSED, (WPARAM) elapsed);
statelapsed = elapsed;
}
if (statperct != percentage) {
send_msg(gui_hwnd, WM_STATS_PERCENT, (WPARAM) percentage);
statperct = percentage;
}
}
void gui_enable(char *arg)
{
gui_hwnd = (HWND) atoi(arg);
}
char *get_ttymode(void *frontend, const char *mode) { return NULL; }
/* ----------------------------------------------------------------------
* File access abstraction.
*/
/*
* Set local current directory. Returns NULL on success, or else an
* error message which must be freed after printing.
*/
char *psftp_lcd(char *dir)
{
char *ret = NULL;
if (!SetCurrentDirectory(dir)) {
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");
ret = dupprintf("%.*s", i, (LPCTSTR)message);
LocalFree(message);
}
return ret;
}
/*
* Get local current directory. Returns a string which must be
* freed.
*/
char *psftp_getcwd(void)
{
char *ret = snewn(256, char);
int len = GetCurrentDirectory(256, ret);
if (len > 256)
ret = sresize(ret, len, char);
GetCurrentDirectory(len, ret);
return ret;
}
#define TIME_POSIX_TO_WIN(t, ft) (*(LONGLONG*)&(ft) = \
((LONGLONG) (t) + (LONGLONG) 11644473600) * (LONGLONG) 10000000)
#define TIME_WIN_TO_POSIX(ft, t) ((t) = (unsigned long) \
((*(LONGLONG*)&(ft)) / (LONGLONG) 10000000 - (LONGLONG) 11644473600))
struct RFile {
HANDLE h;
};
RFile *open_existing_file(char *name, unsigned long *size,
unsigned long *mtime, unsigned long *atime)
{
HANDLE h;
RFile *ret;
h = CreateFile(name, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, 0, 0);
if (h == INVALID_HANDLE_VALUE)
return NULL;
ret = snew(RFile);
ret->h = h;
if (size)
*size = GetFileSize(h, NULL);
if (mtime || atime) {
FILETIME actime, wrtime;
GetFileTime(h, NULL, &actime, &wrtime);
if (atime)
TIME_WIN_TO_POSIX(actime, *atime);
if (mtime)
TIME_WIN_TO_POSIX(wrtime, *mtime);
}
return ret;
}
int read_from_file(RFile *f, void *buffer, int length)
{
int ret, read;
ret = ReadFile(f->h, buffer, length, &read, NULL);
if (!ret)
return -1; /* error */
else
return read;
}
void close_rfile(RFile *f)
{
CloseHandle(f->h);
sfree(f);
}
struct WFile {
HANDLE h;
};
WFile *open_new_file(char *name)
{
HANDLE h;
WFile *ret;
h = CreateFile(name, GENERIC_WRITE, 0, NULL,
CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
if (h == INVALID_HANDLE_VALUE)
return NULL;
ret = snew(WFile);
ret->h = h;
return ret;
}
int write_to_file(WFile *f, void *buffer, int length)
{
int ret, written;
ret = WriteFile(f->h, buffer, length, &written, NULL);
if (!ret)
return -1; /* error */
else
return written;
}
void set_file_times(WFile *f, unsigned long mtime, unsigned long atime)
{
FILETIME actime, wrtime;
TIME_POSIX_TO_WIN(atime, actime);
TIME_POSIX_TO_WIN(mtime, wrtime);
SetFileTime(f->h, NULL, &actime, &wrtime);
}
void close_wfile(WFile *f)
{
CloseHandle(f->h);
sfree(f);
}
int file_type(char *name)
{
DWORD attr;
attr = GetFileAttributes(name);
/* We know of no `weird' files under Windows. */
if (attr == (DWORD)-1)
return FILE_TYPE_NONEXISTENT;
else if (attr & FILE_ATTRIBUTE_DIRECTORY)
return FILE_TYPE_DIRECTORY;
else
return FILE_TYPE_FILE;
}
struct DirHandle {
HANDLE h;
char *name;
};
DirHandle *open_directory(char *name)
{
HANDLE h;
WIN32_FIND_DATA fdat;
char *findfile;
DirHandle *ret;
/* Enumerate files in dir `foo'. */
findfile = dupcat(name, "/*", NULL);
h = FindFirstFile(findfile, &fdat);
if (h == INVALID_HANDLE_VALUE)
return NULL;
sfree(findfile);
ret = snew(DirHandle);
ret->h = h;
ret->name = dupstr(fdat.cFileName);
return ret;
}
char *read_filename(DirHandle *dir)
{
do {
if (!dir->name) {
WIN32_FIND_DATA fdat;
int ok = FindNextFile(dir->h, &fdat);
if (!ok)
return NULL;
else
dir->name = dupstr(fdat.cFileName);
}
assert(dir->name);
if (dir->name[0] == '.' &&
(dir->name[1] == '\0' ||
(dir->name[1] == '.' && dir->name[2] == '\0'))) {
sfree(dir->name);
dir->name = NULL;
}
} while (!dir->name);
if (dir->name) {
char *ret = dir->name;
dir->name = NULL;
return ret;
} else
return NULL;
}
void close_directory(DirHandle *dir)
{
FindClose(dir->h);
if (dir->name)
sfree(dir->name);
sfree(dir);
}
int test_wildcard(char *name, int cmdline)
{
HANDLE fh;
WIN32_FIND_DATA fdat;
/* First see if the exact name exists. */
if (GetFileAttributes(name) != (DWORD)-1)
return WCTYPE_FILENAME;
/* Otherwise see if a wildcard match finds anything. */
fh = FindFirstFile(name, &fdat);
if (fh == INVALID_HANDLE_VALUE)
return WCTYPE_NONEXISTENT;
FindClose(fh);
return WCTYPE_WILDCARD;
}
struct WildcardMatcher {
HANDLE h;
char *name;
char *srcpath;
};
/*
* 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;
}
WildcardMatcher *begin_wildcard_matching(char *name)
{
HANDLE h;
WIN32_FIND_DATA fdat;
WildcardMatcher *ret;
char *last;
h = FindFirstFile(name, &fdat);
if (h == INVALID_HANDLE_VALUE)
return NULL;
ret = snew(WildcardMatcher);
ret->h = h;
ret->srcpath = dupstr(name);
last = stripslashes(ret->srcpath, 1);
*last = '\0';
if (fdat.cFileName[0] == '.' &&
(fdat.cFileName[1] == '\0' ||
(fdat.cFileName[1] == '.' && fdat.cFileName[2] == '\0')))
ret->name = NULL;
else
ret->name = dupcat(ret->srcpath, fdat.cFileName, NULL);
return ret;
}
char *wildcard_get_filename(WildcardMatcher *dir)
{
while (!dir->name) {
WIN32_FIND_DATA fdat;
int ok = FindNextFile(dir->h, &fdat);
if (!ok)
return NULL;
if (fdat.cFileName[0] == '.' &&
(fdat.cFileName[1] == '\0' ||
(fdat.cFileName[1] == '.' && fdat.cFileName[2] == '\0')))
dir->name = NULL;
else
dir->name = dupcat(dir->srcpath, fdat.cFileName, NULL);
}
if (dir->name) {
char *ret = dir->name;
dir->name = NULL;
return ret;
} else
return NULL;
}
void finish_wildcard_matching(WildcardMatcher *dir)
{
FindClose(dir->h);
if (dir->name)
sfree(dir->name);
sfree(dir->srcpath);
sfree(dir);
}
int vet_filename(char *name)
{
if (strchr(name, '/') || strchr(name, '\\') || strchr(name, ':'))
return FALSE;
if (!name[strspn(name, ".")]) /* entirely composed of dots */
return FALSE;
return TRUE;
}
int create_directory(char *name)
{
return CreateDirectory(name, NULL) != 0;
}
char *dir_file_cat(char *dir, char *file)
{
return dupcat(dir, "\\", file, NULL);
}
/* ----------------------------------------------------------------------
* Platform-specific network handling.
*/
/*
* Be told what socket we're supposed to be using.
*/
static SOCKET sftp_ssh_socket = INVALID_SOCKET;
static HANDLE netevent = NULL;
char *do_select(SOCKET skt, int startup)
{
int events;
if (startup)
sftp_ssh_socket = skt;
else
sftp_ssh_socket = INVALID_SOCKET;
if (p_WSAEventSelect) {
if (startup) {
events = (FD_CONNECT | FD_READ | FD_WRITE |
FD_OOB | FD_CLOSE | FD_ACCEPT);
netevent = CreateEvent(NULL, FALSE, FALSE, NULL);
} else {
events = 0;
}
if (p_WSAEventSelect(skt, netevent, events) == SOCKET_ERROR) {
switch (p_WSAGetLastError()) {
case WSAENETDOWN:
return "Network is down";
default:
return "WSAEventSelect(): unknown error";
}
}
}
return NULL;
}
extern int select_result(WPARAM, LPARAM);
int do_eventsel_loop(HANDLE other_event)
{
int n;
long next, ticks;
HANDLE handles[2];
SOCKET *sklist;
int skcount;
long now = GETTICKCOUNT();
if (!netevent) {
return -1; /* doom */
}
handles[0] = netevent;
handles[1] = other_event;
if (run_timers(now, &next)) {
ticks = next - GETTICKCOUNT();
if (ticks < 0) ticks = 0; /* just in case */
} else {
ticks = INFINITE;
}
n = MsgWaitForMultipleObjects(other_event ? 2 : 1, handles, FALSE, ticks,
QS_POSTMESSAGE);
if (n == WAIT_OBJECT_0 + 0) {
WSANETWORKEVENTS things;
SOCKET socket;
extern SOCKET first_socket(int *), next_socket(int *);
extern int select_result(WPARAM, LPARAM);
int i, socketstate;
/*
* We must not call select_result() for any socket
* until we have finished enumerating within the
* tree. This is because select_result() may close
* the socket and modify the tree.
*/
/* Count the active sockets. */
i = 0;
for (socket = first_socket(&socketstate);
socket != INVALID_SOCKET;
socket = next_socket(&socketstate)) i++;
/* Expand the buffer if necessary. */
sklist = snewn(i, SOCKET);
/* Retrieve the sockets into sklist. */
skcount = 0;
for (socket = first_socket(&socketstate);
socket != INVALID_SOCKET;
socket = next_socket(&socketstate)) {
sklist[skcount++] = socket;
}
/* Now we're done enumerating; go through the list. */
for (i = 0; i < skcount; i++) {
WPARAM wp;
socket = sklist[i];
wp = (WPARAM) socket;
if (!p_WSAEnumNetworkEvents(socket, NULL, &things)) {
static const struct { int bit, mask; } eventtypes[] = {
{FD_CONNECT_BIT, FD_CONNECT},
{FD_READ_BIT, FD_READ},
{FD_CLOSE_BIT, FD_CLOSE},
{FD_OOB_BIT, FD_OOB},
{FD_WRITE_BIT, FD_WRITE},
{FD_ACCEPT_BIT, FD_ACCEPT},
};
int e;
noise_ultralight(socket);
noise_ultralight(things.lNetworkEvents);
for (e = 0; e < lenof(eventtypes); e++)
if (things.lNetworkEvents & eventtypes[e].mask) {
LPARAM lp;
int err = things.iErrorCode[eventtypes[e].bit];
lp = WSAMAKESELECTREPLY(eventtypes[e].mask, err);
select_result(wp, lp);
}
}
}
sfree(sklist);
}
if (n == WAIT_TIMEOUT) {
now = next;
} else {
now = GETTICKCOUNT();
}
if (other_event && n == WAIT_OBJECT_0 + 1)
return 1;
return 0;
}
/*
* Wait for some network data and process it.
*
* We have two variants of this function. One uses select() so that
* it's compatible with WinSock 1. The other uses WSAEventSelect
* and MsgWaitForMultipleObjects, so that we can consistently use
* WSAEventSelect throughout; this enables us to also implement
* ssh_sftp_get_cmdline() using a parallel mechanism.
*/
int ssh_sftp_loop_iteration(void)
{
if (sftp_ssh_socket == INVALID_SOCKET)
return -1; /* doom */
if (p_WSAEventSelect == NULL) {
fd_set readfds;
int ret;
long now = GETTICKCOUNT();
if (socket_writable(sftp_ssh_socket))
select_result((WPARAM) sftp_ssh_socket, (LPARAM) FD_WRITE);
do {
long next, ticks;
struct timeval tv, *ptv;
if (run_timers(now, &next)) {
ticks = next - GETTICKCOUNT();
if (ticks <= 0)
ticks = 1; /* just in case */
tv.tv_sec = ticks / 1000;
tv.tv_usec = ticks % 1000 * 1000;
ptv = &tv;
} else {
ptv = NULL;
}
FD_ZERO(&readfds);
FD_SET(sftp_ssh_socket, &readfds);
ret = p_select(1, &readfds, NULL, NULL, ptv);
if (ret < 0)
return -1; /* doom */
else if (ret == 0)
now = next;
else
now = GETTICKCOUNT();
} while (ret == 0);
select_result((WPARAM) sftp_ssh_socket, (LPARAM) FD_READ);
return 0;
} else {
return do_eventsel_loop(NULL);
}
}
/*
* Read a command line from standard input.
*
* In the presence of WinSock 2, we can use WSAEventSelect to
* mediate between the socket and stdin, meaning we can send
* keepalives and respond to server events even while waiting at
* the PSFTP command prompt. Without WS2, we fall back to a simple
* fgets.
*/
struct command_read_ctx {
HANDLE event;
char *line;
};
static DWORD WINAPI command_read_thread(void *param)
{
struct command_read_ctx *ctx = (struct command_read_ctx *) param;
ctx->line = fgetline(stdin);
SetEvent(ctx->event);
return 0;
}
char *ssh_sftp_get_cmdline(char *prompt, int no_fds_ok)
{
int ret;
struct command_read_ctx actx, *ctx = &actx;
DWORD threadid;
fputs(prompt, stdout);
fflush(stdout);
if ((sftp_ssh_socket == INVALID_SOCKET && no_fds_ok) ||
p_WSAEventSelect == NULL) {
return fgetline(stdin); /* very simple */
}
/*
* Create a second thread to read from stdin. Process network
* and timing events until it terminates.
*/
ctx->event = CreateEvent(NULL, FALSE, FALSE, NULL);
ctx->line = NULL;
if (!CreateThread(NULL, 0, command_read_thread,
ctx, 0, &threadid)) {
fprintf(stderr, "Unable to create command input thread\n");
cleanup_exit(1);
}
do {
ret = do_eventsel_loop(ctx->event);
/* Error return can only occur if netevent==NULL, and it ain't. */
assert(ret >= 0);
} while (ret == 0);
return ctx->line;
}
/* ----------------------------------------------------------------------
* Main program. Parse arguments etc.
*/
int main(int argc, char *argv[])
{
int ret;
ret = psftp_main(argc, argv);
return ret;
}
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