[u/mdw/putty] / windows / winplink.c

/*
 * PLink - a Windows 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_APP + 4)

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;
struct handle *stdin_handle, *stdout_handle, *stderr_handle;
DWORD orig_console_mode;
int connopen;

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);
}

char *get_ttymode(void *frontend, const char *mode) { return NULL; }

int from_backend(void *frontend_handle, int is_stderr,
		 const char *data, int len)
{
    if (is_stderr) {
	handle_write(stderr_handle, data, len);
    } else {
	handle_write(stdout_handle, data, len);
    }

    return handle_backlog(stdout_handle) + handle_backlog(stderr_handle);
}

int from_backend_untrusted(void *frontend_handle, const char *data, int len)
{
    /*
     * No "untrusted" output should get here (the way the code is
     * currently, it's all diverted by FLAG_STDERR).
     */
    assert(!"Unexpected call to from_backend_untrusted()");
    return 0; /* not reached */
}

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;
}

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        print version information and exit\n");
    printf("  -pgpfp    print PGP key fingerprints and exit\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\n");
    printf("  -P port   connect to specified port\n");
    printf("  -l user   connect with specified username\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("  -4 -6     force use of IPv4 or IPv6\n");
    printf("  -C        enable compression\n");
    printf("  -i key    private key file for authentication\n");
    printf("  -noagent  disable use of Pageant\n");
    printf("  -agent    enable use of Pageant\n");
    printf("  -m file   read remote command(s) from file\n");
    printf("  -s        remote command is an SSH subsystem (SSH-2 only)\n");
    printf("  -N        don't start a shell/command (SSH-2 only)\n");
    printf("  -nc host:port\n");
    printf("            open tunnel in place of session (SSH-2 only)\n");
    exit(1);
}

static void version(void)
{
    printf("plink: %s\n", ver);
    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 stdin_gotdata(struct handle *h, void *data, int len)
{
    if (len < 0) {
	/*
	 * Special case: report read error.
	 */
	fprintf(stderr, "Unable to read from standard input\n");
	cleanup_exit(0);
    }
    noise_ultralight(len);
    if (connopen && back->connected(backhandle)) {
	if (len > 0) {
	    return back->send(backhandle, data, len);
	} else {
	    back->special(backhandle, TS_EOF);
	    return 0;
	}
    } else
	return 0;
}

void stdouterr_sent(struct handle *h, int new_backlog)
{
    if (new_backlog < 0) {
	/*
	 * Special case: report write error.
	 */
	fprintf(stderr, "Unable to write to standard %s\n",
		(h == stdout_handle ? "output" : "error"));
	cleanup_exit(0);
    }
    if (connopen && back->connected(backhandle)) {
	back->unthrottle(backhandle, (handle_backlog(stdout_handle) +
				      handle_backlog(stderr_handle)));
    }
}

int main(int argc, char **argv)
{
    int sending;
    int portnumber = -1;
    SOCKET *sklist;
    int skcount, sksize;
    int exitcode;
    int errors;
    int use_subsystem = 0;
    long now, next;

    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);
    loaded_session = FALSE;
    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 if (!strcmp(p, "-V")) {
                version();
            } else if (!strcmp(p, "-pgpfp")) {
                pgp_fingerprints();
                exit(1);
	    } else {
		fprintf(stderr, "plink: unknown option \"%s\"\n", p);
		errors = 1;
	    }
	} else if (*p) {
	    if (!cfg_launchable(&cfg)) {
		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, *user, *host;
		    /*
		     * 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;
			    }
			}
		    }

		    /*
		     * A nonzero length string followed by an @ is treated
		     * as a username. (We discount an _initial_ @.) The
		     * rest of the string (or the whole string if no @)
		     * is treated as a session name and/or hostname.
		     */
		    r = strrchr(p, '@');
		    if (r == p)
			p++, r = NULL; /* discount initial @ */
		    if (r) {
			*r++ = '\0';
			user = p, host = r;
		    } else {
			user = NULL, host = p;
		    }

		    /*
		     * Now attempt to load a saved session with the
		     * same name as the hostname.
		     */
		    {
			Config cfg2;
			do_defaults(host, &cfg2);
			if (loaded_session || !cfg_launchable(&cfg2)) {
			    /* No settings for this host; use defaults */
			    /* (or session was already loaded with -load) */
			    strncpy(cfg.host, host, sizeof(cfg.host) - 1);
			    cfg.host[sizeof(cfg.host) - 1] = '\0';
			    cfg.port = default_port;
			} else {
			    cfg = cfg2;
			}
		    }

		    if (user) {
			/* Patch in specified username. */
			strncpy(cfg.username, user,
				sizeof(cfg.username) - 1);
			cfg.username[sizeof(cfg.username) - 1] = '\0';
		    }

		}
	    } 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_launchable(&cfg)) {
	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_launchable(&cfg)) {
	char *atsign = strrchr(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 && !*cfg.remote_cmd && !*cfg.ssh_nc_host)
	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;
    }

    logctx = log_init(NULL, &cfg);
    console_provide_logctx(logctx);

    /*
     * 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, cfg.tcp_keepalives);
	if (error) {
	    fprintf(stderr, "Unable to open connection:\n%s", error);
	    return 1;
	}
	back->provide_logctx(backhandle, logctx);
	sfree(realhost);
    }
    connopen = 1;

    inhandle = GetStdHandle(STD_INPUT_HANDLE);
    outhandle = GetStdHandle(STD_OUTPUT_HANDLE);
    errhandle = GetStdHandle(STD_ERROR_HANDLE);

    /*
     * 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.
     */
    GetConsoleMode(inhandle, &orig_console_mode);
    SetConsoleMode(inhandle, ENABLE_PROCESSED_INPUT);

    /*
     * Pass the output handles to the handle-handling subsystem.
     * (The input one we leave until we're through the
     * authentication process.)
     */
    stdout_handle = handle_output_new(outhandle, stdouterr_sent, NULL, 0);
    stderr_handle = handle_output_new(errhandle, stdouterr_sent, NULL, 0);

    main_thread_id = GetCurrentThreadId();

    sending = FALSE;

    now = GETTICKCOUNT();

    while (1) {
	int nhandles;
	HANDLE *handles;	
	int n;
	DWORD ticks;

	if (!sending && back->sendok(backhandle)) {
	    stdin_handle = handle_input_new(inhandle, stdin_gotdata, NULL,
					    0);
	    sending = TRUE;
	}

	if (run_timers(now, &next)) {
	    ticks = next - GETTICKCOUNT();
	    if (ticks < 0) ticks = 0;  /* just in case */
	} else {
	    ticks = INFINITE;
	}

	handles = handle_get_events(&nhandles);
	handles = sresize(handles, nhandles+1, HANDLE);
	handles[nhandles] = netevent;
	n = MsgWaitForMultipleObjects(nhandles+1, handles, FALSE, ticks,
				      QS_POSTMESSAGE);
	if ((unsigned)(n - WAIT_OBJECT_0) < (unsigned)nhandles) {
	    handle_got_event(handles[n - WAIT_OBJECT_0]);
	} else if (n == WAIT_OBJECT_0 + nhandles) {
	    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 == WAIT_OBJECT_0 + nhandles + 1) {
	    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 (n == WAIT_TIMEOUT) {
	    now = next;
	} else {
	    now = GETTICKCOUNT();
	}

	sfree(handles);

	if (sending)
	    handle_unthrottle(stdin_handle, back->sendbuffer(backhandle));

	if ((!connopen || !back->connected(backhandle)) &&
	    handle_backlog(stdout_handle) + handle_backlog(stderr_handle) == 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 */
}
Commit	Line	Data
12dc4ec0	1	/*
f4ff9455	2	* PLink - a Windows command-line (stdin/stdout) variant of PuTTY.
12dc4ec0	3	*/
12dc4ec0	4
12dc4ec0	5	#include <stdio.h>
49bad831	6	#include <stdlib.h>
2b0c045b	7	#include <assert.h>
12dc4ec0	8	#include <stdarg.h>
12dc4ec0	9
32874aea	10	#define PUTTY_DO_GLOBALS /* actually _define_ globals */
12dc4ec0	11	#include "putty.h"
a9422f39	12	#include "storage.h"
8df7a775	13	#include "tree234.h"
12dc4ec0	14
604fab0c	15	#define WM_AGENT_CALLBACK (WM_APP + 4)
c44bf5bd	16
c44bf5bd	17	struct agent_callback {
	18	void (callback)(void , void *, int);
	19	void *callback_ctx;
	20	void *data;
	21	int len;
	22	};
	23
32874aea	24	void fatalbox(char *p, ...)
32874aea	25	{
12dc4ec0	26	va_list ap;
49bad831	27	fprintf(stderr, "FATAL ERROR: ");
1709795f	28	va_start(ap, p);
	29	vfprintf(stderr, p, ap);
	30	va_end(ap);
	31	fputc('\n', stderr);
1709795f	32	cleanup_exit(1);
	33	}
	34	void modalfatalbox(char *p, ...)
	35	{
	36	va_list ap;
	37	fprintf(stderr, "FATAL ERROR: ");
12dc4ec0	38	va_start(ap, p);
	39	vfprintf(stderr, p, ap);
	40	va_end(ap);
	41	fputc('\n', stderr);
93b581bd	42	cleanup_exit(1);
12dc4ec0	43	}
a8327734	44	void connection_fatal(void frontend, char p, ...)
32874aea	45	{
8d5de777	46	va_list ap;
49bad831	47	fprintf(stderr, "FATAL ERROR: ");
8d5de777	48	va_start(ap, p);
	49	vfprintf(stderr, p, ap);
	50	va_end(ap);
	51	fputc('\n', stderr);
93b581bd	52	cleanup_exit(1);
8d5de777	53	}
c0a81592	54	void cmdline_error(char *p, ...)
	55	{
	56	va_list ap;
	57	fprintf(stderr, "plink: ");
	58	va_start(ap, p);
	59	vfprintf(stderr, p, ap);
	60	va_end(ap);
	61	fputc('\n', stderr);
	62	exit(1);
	63	}
12dc4ec0	64
0965bee0	65	HANDLE inhandle, outhandle, errhandle;
34292b1d	66	struct handle stdin_handle, stdout_handle, *stderr_handle;
6f34e365	67	DWORD orig_console_mode;
34292b1d	68	int connopen;
6f34e365	69
8df7a775	70	WSAEVENT netevent;
8df7a775	71
6b78788a	72	static Backend *back;
6b78788a	73	static void *backhandle;
3ea863a3	74	static Config cfg;
6b78788a	75
887035a5	76	int term_ldisc(Terminal *term, int mode)
32874aea	77	{
	78	return FALSE;
	79	}
b9d7bcad	80	void ldisc_update(void *frontend, int echo, int edit)
32874aea	81	{
0965bee0	82	/* Update stdin read mode to reflect changes in line discipline. */
	83	DWORD mode;
	84
	85	mode = ENABLE_PROCESSED_INPUT;
	86	if (echo)
32874aea	87	mode = mode \| ENABLE_ECHO_INPUT;
0965bee0	88	else
32874aea	89	mode = mode & ~ENABLE_ECHO_INPUT;
0965bee0	90	if (edit)
32874aea	91	mode = mode \| ENABLE_LINE_INPUT;
0965bee0	92	else
32874aea	93	mode = mode & ~ENABLE_LINE_INPUT;
0965bee0	94	SetConsoleMode(inhandle, mode);
	95	}
	96
c6ccd5c2	97	char get_ttymode(void frontend, const char *mode) { return NULL; }
c6ccd5c2	98
9fab77dc	99	int from_backend(void *frontend_handle, int is_stderr,
9fab77dc	100	const char *data, int len)
5471d09a	101	{
5471d09a	102	if (is_stderr) {
34292b1d	103	handle_write(stderr_handle, data, len);
5471d09a	104	} else {
34292b1d	105	handle_write(stdout_handle, data, len);
5471d09a	106	}
5471d09a	107
34292b1d	108	return handle_backlog(stdout_handle) + handle_backlog(stderr_handle);
5471d09a	109	}
5471d09a	110
edd0cb8a	111	int from_backend_untrusted(void frontend_handle, const char data, int len)
	112	{
	113	/*
	114	* No "untrusted" output should get here (the way the code is
	115	* currently, it's all diverted by FLAG_STDERR).
	116	*/
	117	assert(!"Unexpected call to from_backend_untrusted()");
	118	return 0; /* not reached */
	119	}
	120
	121	int get_userpass_input(prompts_t p, unsigned char in, int inlen)
	122	{
	123	int ret;
	124	ret = cmdline_get_passwd_input(p, in, inlen);
	125	if (ret == -1)
	126	ret = console_get_userpass_input(p, in, inlen);
	127	return ret;
	128	}
	129
c44bf5bd	130	static DWORD main_thread_id;
	131
	132	void agent_schedule_callback(void (callback)(void , void *, int),
	133	void callback_ctx, void data, int len)
	134	{
	135	struct agent_callback *c = snew(struct agent_callback);
	136	c->callback = callback;
	137	c->callback_ctx = callback_ctx;
	138	c->data = data;
	139	c->len = len;
	140	PostThreadMessage(main_thread_id, WM_AGENT_CALLBACK, 0, (LPARAM)c);
	141	}
	142
d8426c54	143	/*
	144	* Short description of parameters.
	145	*/
	146	static void usage(void)
	147	{
	148	printf("PuTTY Link: command-line connection utility\n");
	149	printf("%s\n", ver);
	150	printf("Usage: plink [options] [user@]host [command]\n");
e672967c	151	printf(" (\"host\" can also be a PuTTY saved session name)\n");
d8426c54	152	printf("Options:\n");
2285d016	153	printf(" -V print version information and exit\n");
2285d016	154	printf(" -pgpfp print PGP key fingerprints and exit\n");
d8426c54	155	printf(" -v show verbose messages\n");
e2a197cf	156	printf(" -load sessname Load settings from saved session\n");
e2a197cf	157	printf(" -ssh -telnet -rlogin -raw\n");
afd4d0d2	158	printf(" force use of a particular protocol\n");
d8426c54	159	printf(" -P port connect to specified port\n");
e2a197cf	160	printf(" -l user connect with specified username\n");
e2a197cf	161	printf(" -batch disable all interactive prompts\n");
	162	printf("The following options only apply to SSH connections:\n");
	163	printf(" -pw passw login with specified password\n");
dbe6c525	164	printf(" -D [listen-IP:]listen-port\n");
	165	printf(" Dynamic SOCKS-based port forwarding\n");
	166	printf(" -L [listen-IP:]listen-port:host:port\n");
	167	printf(" Forward local port to remote address\n");
	168	printf(" -R [listen-IP:]listen-port:host:port\n");
	169	printf(" Forward remote port to local address\n");
e2a197cf	170	printf(" -X -x enable / disable X11 forwarding\n");
	171	printf(" -A -a enable / disable agent forwarding\n");
	172	printf(" -t -T enable / disable pty allocation\n");
	173	printf(" -1 -2 force use of particular protocol version\n");
05581745	174	printf(" -4 -6 force use of IPv4 or IPv6\n");
e2a197cf	175	printf(" -C enable compression\n");
e2a197cf	176	printf(" -i key private key file for authentication\n");
e5708bc7	177	printf(" -noagent disable use of Pageant\n");
e5708bc7	178	printf(" -agent enable use of Pageant\n");
54018d95	179	printf(" -m file read remote command(s) from file\n");
4d1cdf5d	180	printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
b72c366d	181	printf(" -N don't start a shell/command (SSH-2 only)\n");
23828b7e	182	printf(" -nc host:port\n");
23828b7e	183	printf(" open tunnel in place of session (SSH-2 only)\n");
dc108ebc	184	exit(1);
	185	}
	186
	187	static void version(void)
	188	{
	189	printf("plink: %s\n", ver);
d8426c54	190	exit(1);
	191	}
	192
32874aea	193	char *do_select(SOCKET skt, int startup)
32874aea	194	{
8df7a775	195	int events;
8df7a775	196	if (startup) {
3ad9d396	197	events = (FD_CONNECT \| FD_READ \| FD_WRITE \|
3ad9d396	198	FD_OOB \| FD_CLOSE \| FD_ACCEPT);
8df7a775	199	} else {
	200	events = 0;
	201	}
7440fd44	202	if (p_WSAEventSelect(skt, netevent, events) == SOCKET_ERROR) {
7440fd44	203	switch (p_WSAGetLastError()) {
32874aea	204	case WSAENETDOWN:
	205	return "Network is down";
	206	default:
7440fd44	207	return "WSAEventSelect(): unknown error";
32874aea	208	}
8df7a775	209	}
	210	return NULL;
	211	}
	212
34292b1d	213	int stdin_gotdata(struct handle h, void data, int len)
	214	{
	215	if (len < 0) {
	216	/*
	217	* Special case: report read error.
	218	*/
	219	fprintf(stderr, "Unable to read from standard input\n");
	220	cleanup_exit(0);
	221	}
	222	noise_ultralight(len);
6226c939	223	if (connopen && back->connected(backhandle)) {
34292b1d	224	if (len > 0) {
	225	return back->send(backhandle, data, len);
	226	} else {
	227	back->special(backhandle, TS_EOF);
	228	return 0;
	229	}
	230	} else
	231	return 0;
	232	}
	233
	234	void stdouterr_sent(struct handle *h, int new_backlog)
	235	{
	236	if (new_backlog < 0) {
	237	/*
	238	* Special case: report write error.
	239	*/
	240	fprintf(stderr, "Unable to write to standard %s\n",
	241	(h == stdout_handle ? "output" : "error"));
	242	cleanup_exit(0);
	243	}
6226c939	244	if (connopen && back->connected(backhandle)) {
34292b1d	245	back->unthrottle(backhandle, (handle_backlog(stdout_handle) +
	246	handle_backlog(stderr_handle)));
	247	}
	248	}
	249
32874aea	250	int main(int argc, char **argv)
32874aea	251	{
12dc4ec0	252	int sending;
d8426c54	253	int portnumber = -1;
8df7a775	254	SOCKET *sklist;
8df7a775	255	int skcount, sksize;
d8d6c7e5	256	int exitcode;
86256dc6	257	int errors;
4d1cdf5d	258	int use_subsystem = 0;
39934deb	259	long now, next;
12dc4ec0	260
32874aea	261	sklist = NULL;
32874aea	262	skcount = sksize = 0;
c9bdcd96	263	/*
	264	* Initialise port and protocol to sensible defaults. (These
	265	* will be overridden by more or less anything.)
	266	*/
	267	default_protocol = PROT_SSH;
	268	default_port = 22;
8df7a775	269
67779be7	270	flags = FLAG_STDERR;
12dc4ec0	271	/*
	272	* Process the command line.
	273	*/
a9422f39	274	do_defaults(NULL, &cfg);
18e62ad8	275	loaded_session = FALSE;
e7a7383f	276	default_protocol = cfg.protocol;
e7a7383f	277	default_port = cfg.port;
86256dc6	278	errors = 0;
8cb9c947	279	{
32874aea	280	/*
	281	* Override the default protocol if PLINK_PROTOCOL is set.
	282	*/
	283	char *p = getenv("PLINK_PROTOCOL");
	284	int i;
	285	if (p) {
	286	for (i = 0; backends[i].backend != NULL; i++) {
	287	if (!strcmp(backends[i].name, p)) {
	288	default_protocol = cfg.protocol = backends[i].protocol;
	289	default_port = cfg.port =
	290	backends[i].backend->default_port;
	291	break;
	292	}
	293	}
	294	}
8cb9c947	295	}
12dc4ec0	296	while (--argc) {
32874aea	297	char p = ++argv;
32874aea	298	if (*p == '-') {
5555d393	299	int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
5555d393	300	1, &cfg);
c0a81592	301	if (ret == -2) {
	302	fprintf(stderr,
	303	"plink: option \"%s\" requires an argument\n", p);
86256dc6	304	errors = 1;
c0a81592	305	} else if (ret == 2) {
	306	--argc, ++argv;
	307	} else if (ret == 1) {
	308	continue;
ff2ae367	309	} else if (!strcmp(p, "-batch")) {
c0a81592	310	console_batch_mode = 1;
4d1cdf5d	311	} else if (!strcmp(p, "-s")) {
	312	/* Save status to write to cfg later. */
	313	use_subsystem = 1;
dc108ebc	314	} else if (!strcmp(p, "-V")) {
dc108ebc	315	version();
2285d016	316	} else if (!strcmp(p, "-pgpfp")) {
	317	pgp_fingerprints();
	318	exit(1);
86256dc6	319	} else {
	320	fprintf(stderr, "plink: unknown option \"%s\"\n", p);
	321	errors = 1;
32874aea	322	}
12dc4ec0	323	} else if (*p) {
7374c779	324	if (!cfg_launchable(&cfg)) {
32874aea	325	char *q = p;
	326	/*
	327	* If the hostname starts with "telnet:", set the
	328	* protocol to Telnet and process the string as a
	329	* Telnet URL.
	330	*/
	331	if (!strncmp(q, "telnet:", 7)) {
	332	char c;
	333
	334	q += 7;
	335	if (q[0] == '/' && q[1] == '/')
	336	q += 2;
	337	cfg.protocol = PROT_TELNET;
	338	p = q;
	339	while (p && p != ':' && *p != '/')
	340	p++;
	341	c = *p;
	342	if (*p)
	343	*p++ = '\0';
	344	if (c == ':')
	345	cfg.port = atoi(p);
	346	else
	347	cfg.port = -1;
	348	strncpy(cfg.host, q, sizeof(cfg.host) - 1);
	349	cfg.host[sizeof(cfg.host) - 1] = '\0';
	350	} else {
3608528b	351	char r, user, *host;
32874aea	352	/*
	353	* Before we process the [user@]host string, we
	354	* first check for the presence of a protocol
	355	* prefix (a protocol name followed by ",").
	356	*/
	357	r = strchr(p, ',');
	358	if (r) {
	359	int i, j;
	360	for (i = 0; backends[i].backend != NULL; i++) {
	361	j = strlen(backends[i].name);
	362	if (j == r - p &&
	363	!memcmp(backends[i].name, p, j)) {
	364	default_protocol = cfg.protocol =
	365	backends[i].protocol;
	366	portnumber =
	367	backends[i].backend->default_port;
	368	p = r + 1;
	369	break;
	370	}
	371	}
	372	}
	373
	374	/*
3608528b	375	* A nonzero length string followed by an @ is treated
	376	* as a username. (We discount an _initial_ @.) The
	377	* rest of the string (or the whole string if no @)
	378	* is treated as a session name and/or hostname.
32874aea	379	*/
	380	r = strrchr(p, '@');
	381	if (r == p)
	382	p++, r = NULL; /* discount initial @ */
3608528b	383	if (r) {
	384	*r++ = '\0';
	385	user = p, host = r;
	386	} else {
	387	user = NULL, host = p;
	388	}
	389
	390	/*
	391	* Now attempt to load a saved session with the
	392	* same name as the hostname.
	393	*/
	394	{
32874aea	395	Config cfg2;
3608528b	396	do_defaults(host, &cfg2);
7374c779	397	if (loaded_session \|\| !cfg_launchable(&cfg2)) {
32874aea	398	/* No settings for this host; use defaults */
18e62ad8	399	/* (or session was already loaded with -load) */
3608528b	400	strncpy(cfg.host, host, sizeof(cfg.host) - 1);
32874aea	401	cfg.host[sizeof(cfg.host) - 1] = '\0';
	402	cfg.port = default_port;
	403	} else {
	404	cfg = cfg2;
32874aea	405	}
3608528b	406	}
	407
	408	if (user) {
	409	/* Patch in specified username. */
	410	strncpy(cfg.username, user,
	411	sizeof(cfg.username) - 1);
32874aea	412	cfg.username[sizeof(cfg.username) - 1] = '\0';
32874aea	413	}
3608528b	414
32874aea	415	}
32874aea	416	} else {
385528da	417	char *command;
	418	int cmdlen, cmdsize;
	419	cmdlen = cmdsize = 0;
	420	command = NULL;
	421
	422	while (argc) {
	423	while (*p) {
	424	if (cmdlen >= cmdsize) {
	425	cmdsize = cmdlen + 512;
3d88e64d	426	command = sresize(command, cmdsize, char);
385528da	427	}
	428	command[cmdlen++]=*p++;
	429	}
	430	if (cmdlen >= cmdsize) {
	431	cmdsize = cmdlen + 512;
3d88e64d	432	command = sresize(command, cmdsize, char);
385528da	433	}
	434	command[cmdlen++]=' '; /* always add trailing space */
	435	if (--argc) p = *++argv;
32874aea	436	}
385528da	437	if (cmdlen) command[--cmdlen]='\0';
	438	/* change trailing blank to NUL */
	439	cfg.remote_cmd_ptr = command;
	440	cfg.remote_cmd_ptr2 = NULL;
32874aea	441	cfg.nopty = TRUE; /* command => no terminal */
385528da	442
32874aea	443	break; /* done with cmdline */
32874aea	444	}
12dc4ec0	445	}
	446	}
	447
86256dc6	448	if (errors)
	449	return 1;
	450
7374c779	451	if (!cfg_launchable(&cfg)) {
32874aea	452	usage();
d8426c54	453	}
d8426c54	454
449925a6	455	/*
	456	* Trim leading whitespace off the hostname if it's there.
	457	*/
	458	{
	459	int space = strspn(cfg.host, " \t");
	460	memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space);
	461	}
	462
	463	/* See if host is of the form user@host */
7374c779	464	if (cfg_launchable(&cfg)) {
5dd103a8	465	char *atsign = strrchr(cfg.host, '@');
449925a6	466	/* Make sure we're not overflowing the user field */
	467	if (atsign) {
	468	if (atsign - cfg.host < sizeof cfg.username) {
	469	strncpy(cfg.username, cfg.host, atsign - cfg.host);
	470	cfg.username[atsign - cfg.host] = '\0';
	471	}
	472	memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1));
	473	}
	474	}
	475
	476	/*
c0a81592	477	* Perform command-line overrides on session configuration.
c0a81592	478	*/
5555d393	479	cmdline_run_saved(&cfg);
c0a81592	480
c0a81592	481	/*
4d1cdf5d	482	* Apply subsystem status.
	483	*/
	484	if (use_subsystem)
	485	cfg.ssh_subsys = TRUE;
	486
	487	/*
449925a6	488	* Trim a colon suffix off the hostname if it's there.
	489	*/
	490	cfg.host[strcspn(cfg.host, ":")] = '\0';
	491
cae0c023	492	/*
	493	* Remove any remaining whitespace from the hostname.
	494	*/
	495	{
	496	int p1 = 0, p2 = 0;
	497	while (cfg.host[p2] != '\0') {
	498	if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') {
	499	cfg.host[p1] = cfg.host[p2];
	500	p1++;
	501	}
	502	p2++;
	503	}
	504	cfg.host[p1] = '\0';
	505	}
	506
feb02b4e	507	if (!cfg.remote_cmd_ptr && !cfg.remote_cmd && !cfg.ssh_nc_host)
32874aea	508	flags \|= FLAG_INTERACTIVE;
67779be7	509
12dc4ec0	510	/*
	511	* Select protocol. This is farmed out into a table in a
	512	* separate file to enable an ssh-free variant.
	513	*/
	514	{
32874aea	515	int i;
	516	back = NULL;
	517	for (i = 0; backends[i].backend != NULL; i++)
	518	if (backends[i].protocol == cfg.protocol) {
	519	back = backends[i].backend;
	520	break;
	521	}
	522	if (back == NULL) {
	523	fprintf(stderr,
	524	"Internal fault: Unsupported protocol found\n");
	525	return 1;
	526	}
12dc4ec0	527	}
	528
	529	/*
8cb9c947	530	* Select port.
	531	*/
	532	if (portnumber != -1)
32874aea	533	cfg.port = portnumber;
8cb9c947	534
7440fd44	535	sk_init();
	536	if (p_WSAEventSelect == NULL) {
	537	fprintf(stderr, "Plink requires WinSock 2\n");
12dc4ec0	538	return 1;
	539	}
	540
1626d169	541	logctx = log_init(NULL, &cfg);
	542	console_provide_logctx(logctx);
	543
12dc4ec0	544	/*
	545	* Start up the connection.
	546	*/
8df7a775	547	netevent = CreateEvent(NULL, FALSE, FALSE, NULL);
12dc4ec0	548	{
cbe2d68f	549	const char *error;
12dc4ec0	550	char *realhost;
2184a5d9	551	/* nodelay is only useful if stdin is a character device (console) */
	552	int nodelay = cfg.tcp_nodelay &&
	553	(GetFileType(GetStdHandle(STD_INPUT_HANDLE)) == FILE_TYPE_CHAR);
12dc4ec0	554
86916870	555	error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port,
79bf227b	556	&realhost, nodelay, cfg.tcp_keepalives);
12dc4ec0	557	if (error) {
	558	fprintf(stderr, "Unable to open connection:\n%s", error);
	559	return 1;
	560	}
a8327734	561	back->provide_logctx(backhandle, logctx);
6e1ebb76	562	sfree(realhost);
12dc4ec0	563	}
8df7a775	564	connopen = 1;
12dc4ec0	565
0965bee0	566	inhandle = GetStdHandle(STD_INPUT_HANDLE);
12dc4ec0	567	outhandle = GetStdHandle(STD_OUTPUT_HANDLE);
fe50e814	568	errhandle = GetStdHandle(STD_ERROR_HANDLE);
34292b1d	569
12dc4ec0	570	/*
12dc4ec0	571	* Turn off ECHO and LINE input modes. We don't care if this
	572	* call fails, because we know we aren't necessarily running in
	573	* a console.
	574	*/
f8efb0d5	575	GetConsoleMode(inhandle, &orig_console_mode);
	576	SetConsoleMode(inhandle, ENABLE_PROCESSED_INPUT);
	577
34292b1d	578	/*
	579	* Pass the output handles to the handle-handling subsystem.
	580	* (The input one we leave until we're through the
	581	* authentication process.)
	582	*/
bdebd7e9	583	stdout_handle = handle_output_new(outhandle, stdouterr_sent, NULL, 0);
bdebd7e9	584	stderr_handle = handle_output_new(errhandle, stdouterr_sent, NULL, 0);
34292b1d	585
f8efb0d5	586	main_thread_id = GetCurrentThreadId();
f8efb0d5	587
12dc4ec0	588	sending = FALSE;
5471d09a	589
39934deb	590	now = GETTICKCOUNT();
39934deb	591
12dc4ec0	592	while (1) {
34292b1d	593	int nhandles;
34292b1d	594	HANDLE *handles;
32874aea	595	int n;
39934deb	596	DWORD ticks;
32874aea	597
51470298	598	if (!sending && back->sendok(backhandle)) {
bdebd7e9	599	stdin_handle = handle_input_new(inhandle, stdin_gotdata, NULL,
bdebd7e9	600	0);
32874aea	601	sending = TRUE;
	602	}
	603
39934deb	604	if (run_timers(now, &next)) {
	605	ticks = next - GETTICKCOUNT();
	606	if (ticks < 0) ticks = 0; /* just in case */
	607	} else {
	608	ticks = INFINITE;
	609	}
	610
34292b1d	611	handles = handle_get_events(&nhandles);
	612	handles = sresize(handles, nhandles+1, HANDLE);
	613	handles[nhandles] = netevent;
	614	n = MsgWaitForMultipleObjects(nhandles+1, handles, FALSE, ticks,
c44bf5bd	615	QS_POSTMESSAGE);
34292b1d	616	if ((unsigned)(n - WAIT_OBJECT_0) < (unsigned)nhandles) {
	617	handle_got_event(handles[n - WAIT_OBJECT_0]);
	618	} else if (n == WAIT_OBJECT_0 + nhandles) {
32874aea	619	WSANETWORKEVENTS things;
8df7a775	620	SOCKET socket;
d2371c81	621	extern SOCKET first_socket(int ), next_socket(int );
8df7a775	622	extern int select_result(WPARAM, LPARAM);
32874aea	623	int i, socketstate;
	624
	625	/*
	626	* We must not call select_result() for any socket
	627	* until we have finished enumerating within the tree.
	628	* This is because select_result() may close the socket
	629	* and modify the tree.
	630	*/
	631	/* Count the active sockets. */
	632	i = 0;
	633	for (socket = first_socket(&socketstate);
	634	socket != INVALID_SOCKET;
	635	socket = next_socket(&socketstate)) i++;
	636
	637	/* Expand the buffer if necessary. */
	638	if (i > sksize) {
	639	sksize = i + 16;
3d88e64d	640	sklist = sresize(sklist, sksize, SOCKET);
32874aea	641	}
	642
	643	/* Retrieve the sockets into sklist. */
	644	skcount = 0;
	645	for (socket = first_socket(&socketstate);
	646	socket != INVALID_SOCKET;
d2371c81	647	socket = next_socket(&socketstate)) {
32874aea	648	sklist[skcount++] = socket;
	649	}
	650
	651	/* Now we're done enumerating; go through the list. */
	652	for (i = 0; i < skcount; i++) {
	653	WPARAM wp;
	654	socket = sklist[i];
	655	wp = (WPARAM) socket;
7440fd44	656	if (!p_WSAEnumNetworkEvents(socket, NULL, &things)) {
64cdd21b	657	static const struct { int bit, mask; } eventtypes[] = {
	658	{FD_CONNECT_BIT, FD_CONNECT},
	659	{FD_READ_BIT, FD_READ},
	660	{FD_CLOSE_BIT, FD_CLOSE},
	661	{FD_OOB_BIT, FD_OOB},
	662	{FD_WRITE_BIT, FD_WRITE},
	663	{FD_ACCEPT_BIT, FD_ACCEPT},
	664	};
	665	int e;
	666
32874aea	667	noise_ultralight(socket);
32874aea	668	noise_ultralight(things.lNetworkEvents);
d74d141c	669
64cdd21b	670	for (e = 0; e < lenof(eventtypes); e++)
	671	if (things.lNetworkEvents & eventtypes[e].mask) {
	672	LPARAM lp;
	673	int err = things.iErrorCode[eventtypes[e].bit];
	674	lp = WSAMAKESELECTREPLY(eventtypes[e].mask, err);
	675	connopen &= select_result(wp, lp);
	676	}
8df7a775	677	}
8df7a775	678	}
34292b1d	679	} else if (n == WAIT_OBJECT_0 + nhandles + 1) {
c44bf5bd	680	MSG msg;
	681	while (PeekMessage(&msg, INVALID_HANDLE_VALUE,
	682	WM_AGENT_CALLBACK, WM_AGENT_CALLBACK,
	683	PM_REMOVE)) {
	684	struct agent_callback c = (struct agent_callback )msg.lParam;
	685	c->callback(c->callback_ctx, c->data, c->len);
	686	sfree(c);
	687	}
5471d09a	688	}
39934deb	689
	690	if (n == WAIT_TIMEOUT) {
	691	now = next;
	692	} else {
	693	now = GETTICKCOUNT();
	694	}
	695
34292b1d	696	sfree(handles);
	697
	698	if (sending)
	699	handle_unthrottle(stdin_handle, back->sendbuffer(backhandle));
	700
6226c939	701	if ((!connopen \|\| !back->connected(backhandle)) &&
34292b1d	702	handle_backlog(stdout_handle) + handle_backlog(stderr_handle) == 0)
32874aea	703	break; /* we closed the connection */
12dc4ec0	704	}
51470298	705	exitcode = back->exitcode(backhandle);
d8d6c7e5	706	if (exitcode < 0) {
	707	fprintf(stderr, "Remote process exit code unavailable\n");
	708	exitcode = 1; /* this is an error condition */
	709	}
7440fd44	710	cleanup_exit(exitcode);
7440fd44	711	return 0; /* placate compiler warning */
12dc4ec0	712	}