github
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putty
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putty/plink.c

772 строки
20 KiB
C
Исходник Ответственный История

/*
* PLink - a command-line (stdin/stdout) variant of PuTTY.
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <stdarg.h>
#define PUTTY_DO_GLOBALS /* actually _define_ globals */
#include "putty.h"
#include "storage.h"
#include "tree234.h"
#define WM_AGENT_CALLBACK (WM_XUSER + 4)
#define MAX_STDIN_BACKLOG 4096
struct agent_callback {
void (*callback)(void *, void *, int);
void *callback_ctx;
void *data;
int len;
};
void fatalbox(char *p, ...)
{
va_list ap;
fprintf(stderr, "FATAL ERROR: ");
va_start(ap, p);
vfprintf(stderr, p, ap);
va_end(ap);
fputc('\n', stderr);
cleanup_exit(1);
}
void modalfatalbox(char *p, ...)
{
va_list ap;
fprintf(stderr, "FATAL ERROR: ");
va_start(ap, p);
vfprintf(stderr, p, ap);
va_end(ap);
fputc('\n', stderr);
cleanup_exit(1);
}
void connection_fatal(void *frontend, char *p, ...)
{
va_list ap;
fprintf(stderr, "FATAL ERROR: ");
va_start(ap, p);
vfprintf(stderr, p, ap);
va_end(ap);
fputc('\n', stderr);
cleanup_exit(1);
}
void cmdline_error(char *p, ...)
{
va_list ap;
fprintf(stderr, "plink: ");
va_start(ap, p);
vfprintf(stderr, p, ap);
va_end(ap);
fputc('\n', stderr);
exit(1);
}
HANDLE inhandle, outhandle, errhandle;
DWORD orig_console_mode;
WSAEVENT netevent;
static Backend *back;
static void *backhandle;
static Config cfg;
int term_ldisc(Terminal *term, int mode)
{
return FALSE;
}
void ldisc_update(void *frontend, int echo, int edit)
{
/* Update stdin read mode to reflect changes in line discipline. */
DWORD mode;
mode = ENABLE_PROCESSED_INPUT;
if (echo)
mode = mode | ENABLE_ECHO_INPUT;
else
mode = mode & ~ENABLE_ECHO_INPUT;
if (edit)
mode = mode | ENABLE_LINE_INPUT;
else
mode = mode & ~ENABLE_LINE_INPUT;
SetConsoleMode(inhandle, mode);
}
struct input_data {
DWORD len;
char buffer[4096];
HANDLE event, eventback;
};
static DWORD WINAPI stdin_read_thread(void *param)
{
struct input_data *idata = (struct input_data *) param;
HANDLE inhandle;
inhandle = GetStdHandle(STD_INPUT_HANDLE);
while (ReadFile(inhandle, idata->buffer, sizeof(idata->buffer),
&idata->len, NULL) && idata->len > 0) {
SetEvent(idata->event);
WaitForSingleObject(idata->eventback, INFINITE);
}
idata->len = 0;
SetEvent(idata->event);
return 0;
}
struct output_data {
DWORD len, lenwritten;
int writeret;
char *buffer;
int is_stderr, done;
HANDLE event, eventback;
int busy;
};
static DWORD WINAPI stdout_write_thread(void *param)
{
struct output_data *odata = (struct output_data *) param;
HANDLE outhandle, errhandle;
outhandle = GetStdHandle(STD_OUTPUT_HANDLE);
errhandle = GetStdHandle(STD_ERROR_HANDLE);
while (1) {
WaitForSingleObject(odata->eventback, INFINITE);
if (odata->done)
break;
odata->writeret =
WriteFile(odata->is_stderr ? errhandle : outhandle,
odata->buffer, odata->len, &odata->lenwritten, NULL);
SetEvent(odata->event);
}
return 0;
}
bufchain stdout_data, stderr_data;
struct output_data odata, edata;
void try_output(int is_stderr)
{
struct output_data *data = (is_stderr ? &edata : &odata);
void *senddata;
int sendlen;
if (!data->busy) {
bufchain_prefix(is_stderr ? &stderr_data : &stdout_data,
&senddata, &sendlen);
data->buffer = senddata;
data->len = sendlen;
SetEvent(data->eventback);
data->busy = 1;
}
}
int from_backend(void *frontend_handle, int is_stderr,
const char *data, int len)
{
int osize, esize;
if (is_stderr) {
bufchain_add(&stderr_data, data, len);
try_output(1);
} else {
bufchain_add(&stdout_data, data, len);
try_output(0);
}
osize = bufchain_size(&stdout_data);
esize = bufchain_size(&stderr_data);
return osize + esize;
}
static DWORD main_thread_id;
void agent_schedule_callback(void (*callback)(void *, void *, int),
void *callback_ctx, void *data, int len)
{
struct agent_callback *c = snew(struct agent_callback);
c->callback = callback;
c->callback_ctx = callback_ctx;
c->data = data;
c->len = len;
PostThreadMessage(main_thread_id, WM_AGENT_CALLBACK, 0, (LPARAM)c);
}
/*
* Short description of parameters.
*/
static void usage(void)
{
printf("PuTTY Link: command-line connection utility\n");
printf("%s\n", ver);
printf("Usage: plink [options] [user@]host [command]\n");
printf(" (\"host\" can also be a PuTTY saved session name)\n");
printf("Options:\n");
printf(" -v show verbose messages\n");
printf(" -load sessname Load settings from saved session\n");
printf(" -ssh -telnet -rlogin -raw\n");
printf(" force use of a particular protocol (default SSH)\n");
printf(" -P port connect to specified port\n");
printf(" -l user connect with specified username\n");
printf(" -m file read remote command(s) from file\n");
printf(" -batch disable all interactive prompts\n");
printf("The following options only apply to SSH connections:\n");
printf(" -pw passw login with specified password\n");
printf(" -D [listen-IP:]listen-port\n");
printf(" Dynamic SOCKS-based port forwarding\n");
printf(" -L [listen-IP:]listen-port:host:port\n");
printf(" Forward local port to remote address\n");
printf(" -R [listen-IP:]listen-port:host:port\n");
printf(" Forward remote port to local address\n");
printf(" -X -x enable / disable X11 forwarding\n");
printf(" -A -a enable / disable agent forwarding\n");
printf(" -t -T enable / disable pty allocation\n");
printf(" -1 -2 force use of particular protocol version\n");
printf(" -C enable compression\n");
printf(" -i key private key file for authentication\n");
printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
exit(1);
}
char *do_select(SOCKET skt, int startup)
{
int events;
if (startup) {
events = (FD_CONNECT | FD_READ | FD_WRITE |
FD_OOB | FD_CLOSE | FD_ACCEPT);
} 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;
}
int main(int argc, char **argv)
{
WSAEVENT stdinevent, stdoutevent, stderrevent;
HANDLE handles[4];
DWORD in_threadid, out_threadid, err_threadid;
struct input_data idata;
int reading;
int sending;
int portnumber = -1;
SOCKET *sklist;
int skcount, sksize;
int connopen;
int exitcode;
int errors;
int use_subsystem = 0;
ssh_get_line = console_get_line;
sklist = NULL;
skcount = sksize = 0;
/*
* Initialise port and protocol to sensible defaults. (These
* will be overridden by more or less anything.)
*/
default_protocol = PROT_SSH;
default_port = 22;
flags = FLAG_STDERR;
/*
* Process the command line.
*/
do_defaults(NULL, &cfg);
default_protocol = cfg.protocol;
default_port = cfg.port;
errors = 0;
{
/*
* Override the default protocol if PLINK_PROTOCOL is set.
*/
char *p = getenv("PLINK_PROTOCOL");
int i;
if (p) {
for (i = 0; backends[i].backend != NULL; i++) {
if (!strcmp(backends[i].name, p)) {
default_protocol = cfg.protocol = backends[i].protocol;
default_port = cfg.port =
backends[i].backend->default_port;
break;
}
}
}
}
while (--argc) {
char *p = *++argv;
if (*p == '-') {
int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
1, &cfg);
if (ret == -2) {
fprintf(stderr,
"plink: option \"%s\" requires an argument\n", p);
errors = 1;
} else if (ret == 2) {
--argc, ++argv;
} else if (ret == 1) {
continue;
} else if (!strcmp(p, "-batch")) {
console_batch_mode = 1;
} else if (!strcmp(p, "-s")) {
/* Save status to write to cfg later. */
use_subsystem = 1;
} else {
fprintf(stderr, "plink: unknown option \"%s\"\n", p);
errors = 1;
}
} else if (*p) {
if (!*cfg.host) {
char *q = p;
/*
* If the hostname starts with "telnet:", set the
* protocol to Telnet and process the string as a
* Telnet URL.
*/
if (!strncmp(q, "telnet:", 7)) {
char c;
q += 7;
if (q[0] == '/' && q[1] == '/')
q += 2;
cfg.protocol = PROT_TELNET;
p = q;
while (*p && *p != ':' && *p != '/')
p++;
c = *p;
if (*p)
*p++ = '\0';
if (c == ':')
cfg.port = atoi(p);
else
cfg.port = -1;
strncpy(cfg.host, q, sizeof(cfg.host) - 1);
cfg.host[sizeof(cfg.host) - 1] = '\0';
} else {
char *r;
/*
* Before we process the [user@]host string, we
* first check for the presence of a protocol
* prefix (a protocol name followed by ",").
*/
r = strchr(p, ',');
if (r) {
int i, j;
for (i = 0; backends[i].backend != NULL; i++) {
j = strlen(backends[i].name);
if (j == r - p &&
!memcmp(backends[i].name, p, j)) {
default_protocol = cfg.protocol =
backends[i].protocol;
portnumber =
backends[i].backend->default_port;
p = r + 1;
break;
}
}
}
/*
* Three cases. Either (a) there's a nonzero
* length string followed by an @, in which
* case that's user and the remainder is host.
* Or (b) there's only one string, not counting
* a potential initial @, and it exists in the
* saved-sessions database. Or (c) only one
* string and it _doesn't_ exist in the
* database.
*/
r = strrchr(p, '@');
if (r == p)
p++, r = NULL; /* discount initial @ */
if (r == NULL) {
/*
* One string.
*/
Config cfg2;
do_defaults(p, &cfg2);
if (cfg2.host[0] == '\0') {
/* No settings for this host; use defaults */
strncpy(cfg.host, p, sizeof(cfg.host) - 1);
cfg.host[sizeof(cfg.host) - 1] = '\0';
cfg.port = default_port;
} else {
cfg = cfg2;
cfg.remote_cmd_ptr = cfg.remote_cmd;
}
} else {
*r++ = '\0';
strncpy(cfg.username, p, sizeof(cfg.username) - 1);
cfg.username[sizeof(cfg.username) - 1] = '\0';
strncpy(cfg.host, r, sizeof(cfg.host) - 1);
cfg.host[sizeof(cfg.host) - 1] = '\0';
cfg.port = default_port;
}
}
} else {
char *command;
int cmdlen, cmdsize;
cmdlen = cmdsize = 0;
command = NULL;
while (argc) {
while (*p) {
if (cmdlen >= cmdsize) {
cmdsize = cmdlen + 512;
command = sresize(command, cmdsize, char);
}
command[cmdlen++]=*p++;
}
if (cmdlen >= cmdsize) {
cmdsize = cmdlen + 512;
command = sresize(command, cmdsize, char);
}
command[cmdlen++]=' '; /* always add trailing space */
if (--argc) p = *++argv;
}
if (cmdlen) command[--cmdlen]='\0';
/* change trailing blank to NUL */
cfg.remote_cmd_ptr = command;
cfg.remote_cmd_ptr2 = NULL;
cfg.nopty = TRUE; /* command => no terminal */
break; /* done with cmdline */
}
}
}
if (errors)
return 1;
if (!*cfg.host) {
usage();
}
/*
* 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));
}
}
/*
* Perform command-line overrides on session configuration.
*/
cmdline_run_saved(&cfg);
/*
* Apply subsystem status.
*/
if (use_subsystem)
cfg.ssh_subsys = TRUE;
/*
* Trim a colon suffix off the hostname if it's there.
*/
cfg.host[strcspn(cfg.host, ":")] = '\0';
/*
* Remove any remaining whitespace from the hostname.
*/
{
int p1 = 0, p2 = 0;
while (cfg.host[p2] != '\0') {
if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') {
cfg.host[p1] = cfg.host[p2];
p1++;
}
p2++;
}
cfg.host[p1] = '\0';
}
if (!*cfg.remote_cmd_ptr)
flags |= FLAG_INTERACTIVE;
/*
* Select protocol. This is farmed out into a table in a
* separate file to enable an ssh-free variant.
*/
{
int i;
back = NULL;
for (i = 0; backends[i].backend != NULL; i++)
if (backends[i].protocol == cfg.protocol) {
back = backends[i].backend;
break;
}
if (back == NULL) {
fprintf(stderr,
"Internal fault: Unsupported protocol found\n");
return 1;
}
}
/*
* Select port.
*/
if (portnumber != -1)
cfg.port = portnumber;
sk_init();
if (p_WSAEventSelect == NULL) {
fprintf(stderr, "Plink requires WinSock 2\n");
return 1;
}
/*
* Start up the connection.
*/
netevent = CreateEvent(NULL, FALSE, FALSE, NULL);
{
const char *error;
char *realhost;
/* nodelay is only useful if stdin is a character device (console) */
int nodelay = cfg.tcp_nodelay &&
(GetFileType(GetStdHandle(STD_INPUT_HANDLE)) == FILE_TYPE_CHAR);
error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port,
&realhost, nodelay);
if (error) {
fprintf(stderr, "Unable to open connection:\n%s", error);
return 1;
}
logctx = log_init(NULL, &cfg);
back->provide_logctx(backhandle, logctx);
console_provide_logctx(logctx);
sfree(realhost);
}
connopen = 1;
stdinevent = CreateEvent(NULL, FALSE, FALSE, NULL);
stdoutevent = CreateEvent(NULL, FALSE, FALSE, NULL);
stderrevent = CreateEvent(NULL, FALSE, FALSE, NULL);
inhandle = GetStdHandle(STD_INPUT_HANDLE);
outhandle = GetStdHandle(STD_OUTPUT_HANDLE);
errhandle = GetStdHandle(STD_ERROR_HANDLE);
GetConsoleMode(inhandle, &orig_console_mode);
SetConsoleMode(inhandle, ENABLE_PROCESSED_INPUT);
main_thread_id = GetCurrentThreadId();
/*
* Turn off ECHO and LINE input modes. We don't care if this
* call fails, because we know we aren't necessarily running in
* a console.
*/
handles[0] = netevent;
handles[1] = stdinevent;
handles[2] = stdoutevent;
handles[3] = stderrevent;
sending = FALSE;
/*
* Create spare threads to write to stdout and stderr, so we
* can arrange asynchronous writes.
*/
odata.event = stdoutevent;
odata.eventback = CreateEvent(NULL, FALSE, FALSE, NULL);
odata.is_stderr = 0;
odata.busy = odata.done = 0;
if (!CreateThread(NULL, 0, stdout_write_thread,
&odata, 0, &out_threadid)) {
fprintf(stderr, "Unable to create output thread\n");
cleanup_exit(1);
}
edata.event = stderrevent;
edata.eventback = CreateEvent(NULL, FALSE, FALSE, NULL);
edata.is_stderr = 1;
edata.busy = edata.done = 0;
if (!CreateThread(NULL, 0, stdout_write_thread,
&edata, 0, &err_threadid)) {
fprintf(stderr, "Unable to create error output thread\n");
cleanup_exit(1);
}
while (1) {
int n;
if (!sending && back->sendok(backhandle)) {
/*
* Create a separate thread to read from stdin. This is
* a total pain, but I can't find another way to do it:
*
* - an overlapped ReadFile or ReadFileEx just doesn't
* happen; we get failure from ReadFileEx, and
* ReadFile blocks despite being given an OVERLAPPED
* structure. Perhaps we can't do overlapped reads
* on consoles. WHY THE HELL NOT?
*
* - WaitForMultipleObjects(netevent, console) doesn't
* work, because it signals the console when
* _anything_ happens, including mouse motions and
* other things that don't cause data to be readable
* - so we're back to ReadFile blocking.
*/
idata.event = stdinevent;
idata.eventback = CreateEvent(NULL, FALSE, FALSE, NULL);
if (!CreateThread(NULL, 0, stdin_read_thread,
&idata, 0, &in_threadid)) {
fprintf(stderr, "Unable to create input thread\n");
cleanup_exit(1);
}
sending = TRUE;
}
n = MsgWaitForMultipleObjects(4, handles, FALSE, INFINITE,
QS_POSTMESSAGE);
if (n == 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. */
if (i > sksize) {
sksize = i + 16;
sklist = sresize(sklist, sksize, 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);
connopen &= select_result(wp, lp);
}
}
}
} else if (n == 1) {
reading = 0;
noise_ultralight(idata.len);
if (connopen && back->socket(backhandle) != NULL) {
if (idata.len > 0) {
back->send(backhandle, idata.buffer, idata.len);
} else {
back->special(backhandle, TS_EOF);
}
}
} else if (n == 2) {
odata.busy = 0;
if (!odata.writeret) {
fprintf(stderr, "Unable to write to standard output\n");
cleanup_exit(0);
}
bufchain_consume(&stdout_data, odata.lenwritten);
if (bufchain_size(&stdout_data) > 0)
try_output(0);
if (connopen && back->socket(backhandle) != NULL) {
back->unthrottle(backhandle, bufchain_size(&stdout_data) +
bufchain_size(&stderr_data));
}
} else if (n == 3) {
edata.busy = 0;
if (!edata.writeret) {
fprintf(stderr, "Unable to write to standard output\n");
cleanup_exit(0);
}
bufchain_consume(&stderr_data, edata.lenwritten);
if (bufchain_size(&stderr_data) > 0)
try_output(1);
if (connopen && back->socket(backhandle) != NULL) {
back->unthrottle(backhandle, bufchain_size(&stdout_data) +
bufchain_size(&stderr_data));
}
} else if (n == 4) {
MSG msg;
while (PeekMessage(&msg, INVALID_HANDLE_VALUE,
WM_AGENT_CALLBACK, WM_AGENT_CALLBACK,
PM_REMOVE)) {
struct agent_callback *c = (struct agent_callback *)msg.lParam;
c->callback(c->callback_ctx, c->data, c->len);
sfree(c);
}
}
if (!reading && back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
SetEvent(idata.eventback);
reading = 1;
}
if ((!connopen || back->socket(backhandle) == NULL) &&
bufchain_size(&stdout_data) == 0 &&
bufchain_size(&stderr_data) == 0)
break; /* we closed the connection */
}
exitcode = back->exitcode(backhandle);
if (exitcode < 0) {
fprintf(stderr, "Remote process exit code unavailable\n");
exitcode = 1; /* this is an error condition */
}
cleanup_exit(exitcode);
return 0; /* placate compiler warning */
}
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