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putty
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putty/windows/winsftp.c

735 строки
16 KiB
C
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/*
* winsftp.c: the Windows-specific parts of PSFTP and PSCP.
*/
#include <assert.h>
#include "putty.h"
#include "psftp.h"
#include "ssh.h"
#include "int64.h"
char *get_ttymode(void *frontend, const char *mode) { return NULL; }
int get_userpass_input(prompts_t *p, unsigned char *in, int inlen)
{
int ret;
ret = cmdline_get_passwd_input(p, in, inlen);
if (ret == -1)
ret = console_get_userpass_input(p, in, inlen);
return ret;
}
void platform_get_x11_auth(struct X11Display *display, Conf *conf)
{
/* Do nothing, therefore no auth. */
}
const int platform_uses_x11_unix_by_default = TRUE;
/* ----------------------------------------------------------------------
* 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) do { \
ULARGE_INTEGER uli; \
uli.QuadPart = ((ULONGLONG)(t) + 11644473600ull) * 10000000ull; \
(ft).dwLowDateTime = uli.LowPart; \
(ft).dwHighDateTime = uli.HighPart; \
} while(0)
#define TIME_WIN_TO_POSIX(ft, t) do { \
ULARGE_INTEGER uli; \
uli.LowPart = (ft).dwLowDateTime; \
uli.HighPart = (ft).dwHighDateTime; \
uli.QuadPart = uli.QuadPart / 10000000ull - 11644473600ull; \
(t) = (unsigned long) uli.QuadPart; \
} while(0)
struct RFile {
HANDLE h;
};
RFile *open_existing_file(char *name, uint64 *size,
unsigned long *mtime, unsigned long *atime,
long *perms)
{
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->lo=GetFileSize(h, &(size->hi));
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);
}
if (perms)
*perms = -1;
return ret;
}
int read_from_file(RFile *f, void *buffer, int length)
{
int ret;
DWORD 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, long perms)
{
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;
}
WFile *open_existing_wfile(char *name, uint64 *size)
{
HANDLE h;
WFile *ret;
h = CreateFile(name, GENERIC_WRITE, FILE_SHARE_READ, NULL,
OPEN_EXISTING, 0, 0);
if (h == INVALID_HANDLE_VALUE)
return NULL;
ret = snew(WFile);
ret->h = h;
if (size)
size->lo=GetFileSize(h, &(size->hi));
return ret;
}
int write_to_file(WFile *f, void *buffer, int length)
{
int ret;
DWORD 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);
}
/* Seek offset bytes through file, from whence, where whence is
FROM_START, FROM_CURRENT, or FROM_END */
int seek_file(WFile *f, uint64 offset, int whence)
{
DWORD movemethod;
switch (whence) {
case FROM_START:
movemethod = FILE_BEGIN;
break;
case FROM_CURRENT:
movemethod = FILE_CURRENT;
break;
case FROM_END:
movemethod = FILE_END;
break;
default:
return -1;
}
SetFilePointer(f->h, offset.lo, &(offset.hi), movemethod);
if (GetLastError() != NO_ERROR)
return -1;
else
return 0;
}
uint64 get_file_posn(WFile *f)
{
uint64 ret;
ret.hi = 0L;
ret.lo = SetFilePointer(f->h, 0L, &(ret.hi), FILE_CURRENT);
return ret;
}
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 = INVALID_HANDLE_VALUE;
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, nhandles, nallhandles, netindex, otherindex;
unsigned long next, then;
long ticks;
HANDLE *handles;
SOCKET *sklist;
int skcount;
unsigned long now = GETTICKCOUNT();
if (run_timers(now, &next)) {
then = now;
now = GETTICKCOUNT();
if (now - then > next - then)
ticks = 0;
else
ticks = next - now;
} else {
ticks = INFINITE;
}
handles = handle_get_events(&nhandles);
handles = sresize(handles, nhandles+2, HANDLE);
nallhandles = nhandles;
if (netevent != INVALID_HANDLE_VALUE)
handles[netindex = nallhandles++] = netevent;
else
netindex = -1;
if (other_event != INVALID_HANDLE_VALUE)
handles[otherindex = nallhandles++] = other_event;
else
otherindex = -1;
n = WaitForMultipleObjects(nallhandles, handles, FALSE, ticks);
if ((unsigned)(n - WAIT_OBJECT_0) < (unsigned)nhandles) {
handle_got_event(handles[n - WAIT_OBJECT_0]);
} else if (netindex >= 0 && n == WAIT_OBJECT_0 + netindex) {
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);
}
sfree(handles);
if (n == WAIT_TIMEOUT) {
now = next;
} else {
now = GETTICKCOUNT();
}
if (otherindex >= 0 && n == WAIT_OBJECT_0 + otherindex)
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 (p_WSAEventSelect == NULL) {
fd_set readfds;
int ret;
unsigned long now = GETTICKCOUNT(), then;
if (sftp_ssh_socket == INVALID_SOCKET)
return -1; /* doom */
if (socket_writable(sftp_ssh_socket))
select_result((WPARAM) sftp_ssh_socket, (LPARAM) FD_WRITE);
do {
unsigned long next;
long ticks;
struct timeval tv, *ptv;
if (run_timers(now, &next)) {
then = now;
now = GETTICKCOUNT();
if (now - then > next - then)
ticks = 0;
else
ticks = next - now;
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(INVALID_HANDLE_VALUE);
}
}
/*
* 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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