[sgt/putty] / unix / uxplink.c

/*
 * PLink - a command-line (stdin/stdout) variant of PuTTY.
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <assert.h>
#include <stdarg.h>
#include <signal.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <pwd.h>
#include <sys/ioctl.h>
#include <sys/select.h>

#define PUTTY_DO_GLOBALS	       /* actually _define_ globals */
#include "putty.h"
#include "storage.h"
#include "tree234.h"

#define MAX_STDIN_BACKLOG 4096

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);
}

struct termios orig_termios;

static Backend *back;
static void *backhandle;
static Config cfg;

/*
 * Default settings that are specific to pterm.
 */
char *platform_default_s(const char *name)
{
    if (!strcmp(name, "TermType"))
	return dupstr(getenv("TERM"));
    if (!strcmp(name, "UserName"))
	return get_username();
    return NULL;
}

int platform_default_i(const char *name, int def)
{
    if (!strcmp(name, "TermWidth") ||
	!strcmp(name, "TermHeight")) {
	struct winsize size;
	if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
	    return (!strcmp(name, "TermWidth") ? size.ws_col : size.ws_row);
    }
    return def;
}

FontSpec platform_default_fontspec(const char *name)
{
    FontSpec ret;
    *ret.name = '\0';
    return ret;
}

Filename platform_default_filename(const char *name)
{
    Filename ret;
    if (!strcmp(name, "LogFileName"))
	strcpy(ret.path, "putty.log");
    else
	*ret.path = '\0';
    return ret;
}

char *x_get_default(const char *key)
{
    return NULL;		       /* this is a stub */
}
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. */
    struct termios mode;

    mode = orig_termios;

    if (echo)
	mode.c_lflag |= ECHO;
    else
	mode.c_lflag &= ~ECHO;

    if (edit)
	mode.c_lflag |= ISIG | ICANON;
    else
	mode.c_lflag &= ~(ISIG | ICANON);

    tcsetattr(0, TCSANOW, &mode);
}

void cleanup_termios(void)
{
    tcsetattr(0, TCSANOW, &orig_termios);
}

bufchain stdout_data, stderr_data;

void try_output(int is_stderr)
{
    bufchain *chain = (is_stderr ? &stderr_data : &stdout_data);
    int fd = (is_stderr ? 2 : 1);
    void *senddata;
    int sendlen, ret;

    if (bufchain_size(chain) == 0)
        return;

    bufchain_prefix(chain, &senddata, &sendlen);
    ret = write(fd, senddata, sendlen);
    if (ret > 0)
	bufchain_consume(chain, ret);
    else if (ret < 0) {
	perror(is_stderr ? "stderr: write" : "stdout: write");
	exit(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;
}

int signalpipe[2];

void sigwinch(int signum)
{
    write(signalpipe[1], "x", 1);
}

/*
 * In Plink our selects are synchronous, so these functions are
 * empty stubs.
 */
int uxsel_input_add(int fd, int rwx) { return 0; }
void uxsel_input_remove(int id) { }

/*
 * 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\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("  -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("  -4 -6     force use of IPv4 or IPv6\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");
    printf("  -N        don't start a shell/command (SSH-2 only)\n");
    exit(1);
}

static void version(void)
{
    printf("plink: %s\n", ver);
    exit(1);
}

int main(int argc, char **argv)
{
    int sending;
    int portnumber = -1;
    int *fdlist;
    int fd;
    int i, fdcount, fdsize, fdstate;
    int connopen;
    int exitcode;
    int errors;
    int use_subsystem = 0;
    void *ldisc, *logctx;
    long now;

    ssh_get_line = console_get_line;

    fdlist = NULL;
    fdcount = fdsize = 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, "-o")) {
                if (argc <= 1) {
                    fprintf(stderr,
                            "plink: option \"-o\" requires an argument\n");
		    errors = 1;
		} else {
                    --argc;
		    provide_xrm_string(*++argv);
		}
	    } else {
		fprintf(stderr, "plink: unknown option \"%s\"\n", p);
		errors = 1;
	    }
	} else if (*p) {
	    if (!*cfg.host) {
		char *q = p;

                do_defaults(NULL, &cfg);

		/*
		 * 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 || cfg2.host[0] == '\0') {
			    /* 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;
			    /* Ick: patch up internal pointer after copy */
			    cfg.remote_cmd_ptr = cfg.remote_cmd;
			}
		    }

		    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.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 = 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)
	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;

    /*
     * Set up the pipe we'll use to tell us about SIGWINCH.
     */
    if (pipe(signalpipe) < 0) {
	perror("pipe");
	exit(1);
    }
    putty_signal(SIGWINCH, sigwinch);

    sk_init();
    uxsel_init();

    /*
     * Start up the connection.
     */
    logctx = log_init(NULL, &cfg);
    console_provide_logctx(logctx);
    {
	const char *error;
	char *realhost;
	/* nodelay is only useful if stdin is a terminal device */
	int nodelay = cfg.tcp_nodelay && isatty(0);

	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\n", error);
	    return 1;
	}
	back->provide_logctx(backhandle, logctx);
	ldisc = ldisc_create(&cfg, NULL, back, backhandle, NULL);
	sfree(realhost);
    }
    connopen = 1;

    /*
     * Set up the initial console mode. We don't care if this call
     * fails, because we know we aren't necessarily running in a
     * console.
     */
    tcgetattr(0, &orig_termios);
    atexit(cleanup_termios);
    ldisc_update(NULL, 1, 1);
    sending = FALSE;
    now = GETTICKCOUNT();

    while (1) {
	fd_set rset, wset, xset;
	int maxfd;
	int rwx;
	int ret;

	FD_ZERO(&rset);
	FD_ZERO(&wset);
	FD_ZERO(&xset);
	maxfd = 0;

	FD_SET_MAX(signalpipe[0], maxfd, rset);

	if (connopen && !sending &&
	    back->socket(backhandle) != NULL &&
	    back->sendok(backhandle) &&
	    back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
	    /* If we're OK to send, then try to read from stdin. */
	    FD_SET_MAX(0, maxfd, rset);
	}

	if (bufchain_size(&stdout_data) > 0) {
	    /* If we have data for stdout, try to write to stdout. */
	    FD_SET_MAX(1, maxfd, wset);
	}

	if (bufchain_size(&stderr_data) > 0) {
	    /* If we have data for stderr, try to write to stderr. */
	    FD_SET_MAX(2, maxfd, wset);
	}

	/* Count the currently active fds. */
	i = 0;
	for (fd = first_fd(&fdstate, &rwx); fd >= 0;
	     fd = next_fd(&fdstate, &rwx)) i++;

	/* Expand the fdlist buffer if necessary. */
	if (i > fdsize) {
	    fdsize = i + 16;
	    fdlist = sresize(fdlist, fdsize, int);
	}

	/*
	 * Add all currently open fds to the select sets, and store
	 * them in fdlist as well.
	 */
	fdcount = 0;
	for (fd = first_fd(&fdstate, &rwx); fd >= 0;
	     fd = next_fd(&fdstate, &rwx)) {
	    fdlist[fdcount++] = fd;
	    if (rwx & 1)
		FD_SET_MAX(fd, maxfd, rset);
	    if (rwx & 2)
		FD_SET_MAX(fd, maxfd, wset);
	    if (rwx & 4)
		FD_SET_MAX(fd, maxfd, xset);
	}

	do {
	    long next, ticks;
	    struct timeval tv, *ptv;

	    if (run_timers(now, &next)) {
		ticks = next - GETTICKCOUNT();
		if (ticks < 0) ticks = 0;   /* just in case */
		tv.tv_sec = ticks / 1000;
		tv.tv_usec = ticks % 1000 * 1000;
		ptv = &tv;
	    } else {
		ptv = NULL;
	    }
	    ret = select(maxfd, &rset, &wset, &xset, ptv);
	    if (ret == 0)
		now = next;
	    else
		now = GETTICKCOUNT();
	} while (ret < 0 && errno == EINTR);

	if (ret < 0) {
	    perror("select");
	    exit(1);
	}

	for (i = 0; i < fdcount; i++) {
	    fd = fdlist[i];
            /*
             * We must process exceptional notifications before
             * ordinary readability ones, or we may go straight
             * past the urgent marker.
             */
	    if (FD_ISSET(fd, &xset))
		select_result(fd, 4);
	    if (FD_ISSET(fd, &rset))
		select_result(fd, 1);
	    if (FD_ISSET(fd, &wset))
		select_result(fd, 2);
	}

	if (FD_ISSET(signalpipe[0], &rset)) {
	    char c[1];
	    struct winsize size;
	    read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */
	    if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
		back->size(backhandle, size.ws_col, size.ws_row);
	}

	if (FD_ISSET(0, &rset)) {
	    char buf[4096];
	    int ret;

	    if (connopen && back->socket(backhandle) != NULL) {
		ret = read(0, buf, sizeof(buf));
		if (ret < 0) {
		    perror("stdin: read");
		    exit(1);
		} else if (ret == 0) {
		    back->special(backhandle, TS_EOF);
		    sending = FALSE;   /* send nothing further after this */
		} else {
		    back->send(backhandle, buf, ret);
		}
	    }
	}

	if (FD_ISSET(1, &wset)) {
	    try_output(0);
	}

	if (FD_ISSET(2, &wset)) {
	    try_output(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 exitcode;		       /* shouldn't happen, but placates gcc */
}
Commit	Line	Data
c5e438ec	1	/*
	2	* PLink - a command-line (stdin/stdout) variant of PuTTY.
	3	*/
	4
	5	#include <stdio.h>
	6	#include <stdlib.h>
5673d44e	7	#include <errno.h>
c5e438ec	8	#include <assert.h>
c5e438ec	9	#include <stdarg.h>
5673d44e	10	#include <signal.h>
c5e438ec	11	#include <unistd.h>
	12	#include <fcntl.h>
	13	#include <termios.h>
5a9eb105	14	#include <pwd.h>
5a9eb105	15	#include <sys/ioctl.h>
2a6848cc	16	#include <sys/select.h>
c5e438ec	17
c5e438ec	18	#define PUTTY_DO_GLOBALS /* actually _define_ globals */
	19	#include "putty.h"
	20	#include "storage.h"
	21	#include "tree234.h"
	22
	23	#define MAX_STDIN_BACKLOG 4096
	24
	25	void fatalbox(char *p, ...)
	26	{
	27	va_list ap;
	28	fprintf(stderr, "FATAL ERROR: ");
	29	va_start(ap, p);
	30	vfprintf(stderr, p, ap);
	31	va_end(ap);
	32	fputc('\n', stderr);
	33	cleanup_exit(1);
	34	}
	35	void modalfatalbox(char *p, ...)
	36	{
	37	va_list ap;
	38	fprintf(stderr, "FATAL ERROR: ");
	39	va_start(ap, p);
	40	vfprintf(stderr, p, ap);
	41	va_end(ap);
	42	fputc('\n', stderr);
	43	cleanup_exit(1);
	44	}
	45	void connection_fatal(void frontend, char p, ...)
	46	{
	47	va_list ap;
	48	fprintf(stderr, "FATAL ERROR: ");
	49	va_start(ap, p);
	50	vfprintf(stderr, p, ap);
	51	va_end(ap);
	52	fputc('\n', stderr);
	53	cleanup_exit(1);
	54	}
	55	void cmdline_error(char *p, ...)
	56	{
	57	va_list ap;
	58	fprintf(stderr, "plink: ");
	59	va_start(ap, p);
	60	vfprintf(stderr, p, ap);
	61	va_end(ap);
	62	fputc('\n', stderr);
	63	exit(1);
	64	}
	65
	66	struct termios orig_termios;
	67
	68	static Backend *back;
	69	static void *backhandle;
3ea863a3	70	static Config cfg;
c5e438ec	71
5a9eb105	72	/*
	73	* Default settings that are specific to pterm.
	74	*/
c85623f9	75	char platform_default_s(const char name)
5a9eb105	76	{
5a9eb105	77	if (!strcmp(name, "TermType"))
799dfcfa	78	return dupstr(getenv("TERM"));
	79	if (!strcmp(name, "UserName"))
	80	return get_username();
5a9eb105	81	return NULL;
	82	}
	83
c85623f9	84	int platform_default_i(const char *name, int def)
5a9eb105	85	{
	86	if (!strcmp(name, "TermWidth") \|\|
	87	!strcmp(name, "TermHeight")) {
	88	struct winsize size;
	89	if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
	90	return (!strcmp(name, "TermWidth") ? size.ws_col : size.ws_row);
	91	}
	92	return def;
	93	}
	94
9a30e26b	95	FontSpec platform_default_fontspec(const char *name)
	96	{
	97	FontSpec ret;
	98	*ret.name = '\0';
	99	return ret;
	100	}
	101
	102	Filename platform_default_filename(const char *name)
	103	{
	104	Filename ret;
	105	if (!strcmp(name, "LogFileName"))
	106	strcpy(ret.path, "putty.log");
	107	else
	108	*ret.path = '\0';
	109	return ret;
	110	}
	111
c85623f9	112	char x_get_default(const char key)
c5e438ec	113	{
	114	return NULL; /* this is a stub */
	115	}
	116	int term_ldisc(Terminal *term, int mode)
	117	{
	118	return FALSE;
	119	}
	120	void ldisc_update(void *frontend, int echo, int edit)
	121	{
	122	/* Update stdin read mode to reflect changes in line discipline. */
	123	struct termios mode;
	124
	125	mode = orig_termios;
	126
	127	if (echo)
	128	mode.c_lflag \|= ECHO;
	129	else
	130	mode.c_lflag &= ~ECHO;
	131
	132	if (edit)
	133	mode.c_lflag \|= ISIG \| ICANON;
	134	else
	135	mode.c_lflag &= ~(ISIG \| ICANON);
	136
	137	tcsetattr(0, TCSANOW, &mode);
	138	}
	139
	140	void cleanup_termios(void)
	141	{
	142	tcsetattr(0, TCSANOW, &orig_termios);
	143	}
	144
	145	bufchain stdout_data, stderr_data;
	146
	147	void try_output(int is_stderr)
	148	{
	149	bufchain *chain = (is_stderr ? &stderr_data : &stdout_data);
	150	int fd = (is_stderr ? 2 : 1);
	151	void *senddata;
	152	int sendlen, ret;
	153
d69a46c0	154	if (bufchain_size(chain) == 0)
	155	return;
	156
c5e438ec	157	bufchain_prefix(chain, &senddata, &sendlen);
	158	ret = write(fd, senddata, sendlen);
	159	if (ret > 0)
	160	bufchain_consume(chain, ret);
	161	else if (ret < 0) {
	162	perror(is_stderr ? "stderr: write" : "stdout: write");
	163	exit(1);
	164	}
	165	}
	166
9fab77dc	167	int from_backend(void *frontend_handle, int is_stderr,
9fab77dc	168	const char *data, int len)
c5e438ec	169	{
	170	int osize, esize;
	171
c5e438ec	172	if (is_stderr) {
	173	bufchain_add(&stderr_data, data, len);
	174	try_output(1);
	175	} else {
	176	bufchain_add(&stdout_data, data, len);
	177	try_output(0);
	178	}
	179
	180	osize = bufchain_size(&stdout_data);
	181	esize = bufchain_size(&stderr_data);
	182
	183	return osize + esize;
	184	}
	185
5673d44e	186	int signalpipe[2];
	187
	188	void sigwinch(int signum)
	189	{
	190	write(signalpipe[1], "x", 1);
	191	}
	192
c5e438ec	193	/*
74aca06d	194	* In Plink our selects are synchronous, so these functions are
	195	* empty stubs.
	196	*/
	197	int uxsel_input_add(int fd, int rwx) { return 0; }
	198	void uxsel_input_remove(int id) { }
	199
	200	/*
c5e438ec	201	* Short description of parameters.
	202	*/
	203	static void usage(void)
	204	{
	205	printf("PuTTY Link: command-line connection utility\n");
	206	printf("%s\n", ver);
	207	printf("Usage: plink [options] [user@]host [command]\n");
	208	printf(" (\"host\" can also be a PuTTY saved session name)\n");
	209	printf("Options:\n");
c9a13be6	210	printf(" -V print version information\n");
c5e438ec	211	printf(" -v show verbose messages\n");
	212	printf(" -load sessname Load settings from saved session\n");
	213	printf(" -ssh -telnet -rlogin -raw\n");
afd4d0d2	214	printf(" force use of a particular protocol\n");
c5e438ec	215	printf(" -P port connect to specified port\n");
	216	printf(" -l user connect with specified username\n");
	217	printf(" -m file read remote command(s) from file\n");
	218	printf(" -batch disable all interactive prompts\n");
	219	printf("The following options only apply to SSH connections:\n");
	220	printf(" -pw passw login with specified password\n");
dbe6c525	221	printf(" -D [listen-IP:]listen-port\n");
	222	printf(" Dynamic SOCKS-based port forwarding\n");
	223	printf(" -L [listen-IP:]listen-port:host:port\n");
	224	printf(" Forward local port to remote address\n");
	225	printf(" -R [listen-IP:]listen-port:host:port\n");
	226	printf(" Forward remote port to local address\n");
c5e438ec	227	printf(" -X -x enable / disable X11 forwarding\n");
	228	printf(" -A -a enable / disable agent forwarding\n");
	229	printf(" -t -T enable / disable pty allocation\n");
	230	printf(" -1 -2 force use of particular protocol version\n");
05581745	231	printf(" -4 -6 force use of IPv4 or IPv6\n");
c5e438ec	232	printf(" -C enable compression\n");
c5e438ec	233	printf(" -i key private key file for authentication\n");
09bdfcbb	234	printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
b72c366d	235	printf(" -N don't start a shell/command (SSH-2 only)\n");
dc108ebc	236	exit(1);
	237	}
	238
	239	static void version(void)
	240	{
	241	printf("plink: %s\n", ver);
c5e438ec	242	exit(1);
	243	}
	244
	245	int main(int argc, char **argv)
	246	{
	247	int sending;
	248	int portnumber = -1;
0ff9ea38	249	int *fdlist;
	250	int fd;
	251	int i, fdcount, fdsize, fdstate;
c5e438ec	252	int connopen;
c5e438ec	253	int exitcode;
86256dc6	254	int errors;
09bdfcbb	255	int use_subsystem = 0;
b51259f6	256	void ldisc, logctx;
39934deb	257	long now;
c5e438ec	258
	259	ssh_get_line = console_get_line;
	260
0ff9ea38	261	fdlist = NULL;
0ff9ea38	262	fdcount = fdsize = 0;
c5e438ec	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;
	269
	270	flags = FLAG_STDERR;
	271	/*
	272	* Process the command line.
	273	*/
	274	do_defaults(NULL, &cfg);
18e62ad8	275	loaded_session = FALSE;
c5e438ec	276	default_protocol = cfg.protocol;
c5e438ec	277	default_port = cfg.port;
86256dc6	278	errors = 0;
c5e438ec	279	{
	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	}
	295	}
	296	while (--argc) {
	297	char p = ++argv;
	298	if (*p == '-') {
9b41d3a8	299	int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
9b41d3a8	300	1, &cfg);
c5e438ec	301	if (ret == -2) {
	302	fprintf(stderr,
	303	"plink: option \"%s\" requires an argument\n", p);
86256dc6	304	errors = 1;
c5e438ec	305	} else if (ret == 2) {
	306	--argc, ++argv;
	307	} else if (ret == 1) {
	308	continue;
	309	} else if (!strcmp(p, "-batch")) {
	310	console_batch_mode = 1;
09bdfcbb	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();
a0e5ed33	316	} else if (!strcmp(p, "-o")) {
86256dc6	317	if (argc <= 1) {
a0e5ed33	318	fprintf(stderr,
a0e5ed33	319	"plink: option \"-o\" requires an argument\n");
86256dc6	320	errors = 1;
	321	} else {
	322	--argc;
	323	provide_xrm_string(*++argv);
	324	}
	325	} else {
	326	fprintf(stderr, "plink: unknown option \"%s\"\n", p);
	327	errors = 1;
c5e438ec	328	}
	329	} else if (*p) {
	330	if (!*cfg.host) {
	331	char *q = p;
a0e5ed33	332
	333	do_defaults(NULL, &cfg);
	334
c5e438ec	335	/*
	336	* If the hostname starts with "telnet:", set the
	337	* protocol to Telnet and process the string as a
	338	* Telnet URL.
	339	*/
	340	if (!strncmp(q, "telnet:", 7)) {
	341	char c;
	342
	343	q += 7;
	344	if (q[0] == '/' && q[1] == '/')
	345	q += 2;
	346	cfg.protocol = PROT_TELNET;
	347	p = q;
	348	while (p && p != ':' && *p != '/')
	349	p++;
	350	c = *p;
	351	if (*p)
	352	*p++ = '\0';
	353	if (c == ':')
	354	cfg.port = atoi(p);
	355	else
	356	cfg.port = -1;
	357	strncpy(cfg.host, q, sizeof(cfg.host) - 1);
	358	cfg.host[sizeof(cfg.host) - 1] = '\0';
	359	} else {
3608528b	360	char r, user, *host;
c5e438ec	361	/*
	362	* Before we process the [user@]host string, we
	363	* first check for the presence of a protocol
	364	* prefix (a protocol name followed by ",").
	365	*/
	366	r = strchr(p, ',');
	367	if (r) {
	368	int i, j;
	369	for (i = 0; backends[i].backend != NULL; i++) {
	370	j = strlen(backends[i].name);
	371	if (j == r - p &&
	372	!memcmp(backends[i].name, p, j)) {
	373	default_protocol = cfg.protocol =
	374	backends[i].protocol;
	375	portnumber =
	376	backends[i].backend->default_port;
	377	p = r + 1;
	378	break;
	379	}
	380	}
	381	}
	382
	383	/*
3608528b	384	* A nonzero length string followed by an @ is treated
	385	* as a username. (We discount an _initial_ @.) The
	386	* rest of the string (or the whole string if no @)
	387	* is treated as a session name and/or hostname.
c5e438ec	388	*/
	389	r = strrchr(p, '@');
	390	if (r == p)
	391	p++, r = NULL; /* discount initial @ */
3608528b	392	if (r) {
	393	*r++ = '\0';
	394	user = p, host = r;
	395	} else {
	396	user = NULL, host = p;
	397	}
	398
	399	/*
	400	* Now attempt to load a saved session with the
	401	* same name as the hostname.
	402	*/
	403	{
c5e438ec	404	Config cfg2;
3608528b	405	do_defaults(host, &cfg2);
18e62ad8	406	if (loaded_session \|\| cfg2.host[0] == '\0') {
c5e438ec	407	/* No settings for this host; use defaults */
18e62ad8	408	/* (or session was already loaded with -load) */
3608528b	409	strncpy(cfg.host, host, sizeof(cfg.host) - 1);
c5e438ec	410	cfg.host[sizeof(cfg.host) - 1] = '\0';
	411	cfg.port = default_port;
	412	} else {
	413	cfg = cfg2;
18e62ad8	414	/* Ick: patch up internal pointer after copy */
c5e438ec	415	cfg.remote_cmd_ptr = cfg.remote_cmd;
c5e438ec	416	}
3608528b	417	}
	418
	419	if (user) {
	420	/* Patch in specified username. */
	421	strncpy(cfg.username, user,
	422	sizeof(cfg.username) - 1);
c5e438ec	423	cfg.username[sizeof(cfg.username) - 1] = '\0';
c5e438ec	424	}
3608528b	425
c5e438ec	426	}
	427	} else {
	428	char *command;
	429	int cmdlen, cmdsize;
	430	cmdlen = cmdsize = 0;
	431	command = NULL;
	432
	433	while (argc) {
	434	while (*p) {
	435	if (cmdlen >= cmdsize) {
	436	cmdsize = cmdlen + 512;
3d88e64d	437	command = sresize(command, cmdsize, char);
c5e438ec	438	}
	439	command[cmdlen++]=*p++;
	440	}
	441	if (cmdlen >= cmdsize) {
	442	cmdsize = cmdlen + 512;
3d88e64d	443	command = sresize(command, cmdsize, char);
c5e438ec	444	}
	445	command[cmdlen++]=' '; /* always add trailing space */
	446	if (--argc) p = *++argv;
	447	}
	448	if (cmdlen) command[--cmdlen]='\0';
	449	/* change trailing blank to NUL */
	450	cfg.remote_cmd_ptr = command;
	451	cfg.remote_cmd_ptr2 = NULL;
	452	cfg.nopty = TRUE; /* command => no terminal */
	453
	454	break; /* done with cmdline */
	455	}
	456	}
	457	}
	458
86256dc6	459	if (errors)
	460	return 1;
	461
c5e438ec	462	if (!*cfg.host) {
	463	usage();
	464	}
	465
	466	/*
	467	* Trim leading whitespace off the hostname if it's there.
	468	*/
	469	{
	470	int space = strspn(cfg.host, " \t");
	471	memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space);
	472	}
	473
	474	/* See if host is of the form user@host */
	475	if (cfg.host[0] != '\0') {
5dd103a8	476	char *atsign = strrchr(cfg.host, '@');
c5e438ec	477	/* Make sure we're not overflowing the user field */
	478	if (atsign) {
	479	if (atsign - cfg.host < sizeof cfg.username) {
	480	strncpy(cfg.username, cfg.host, atsign - cfg.host);
	481	cfg.username[atsign - cfg.host] = '\0';
	482	}
	483	memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1));
	484	}
	485	}
	486
	487	/*
	488	* Perform command-line overrides on session configuration.
	489	*/
9b41d3a8	490	cmdline_run_saved(&cfg);
c5e438ec	491
c5e438ec	492	/*
09bdfcbb	493	* Apply subsystem status.
	494	*/
	495	if (use_subsystem)
	496	cfg.ssh_subsys = TRUE;
	497
	498	/*
c5e438ec	499	* Trim a colon suffix off the hostname if it's there.
	500	*/
	501	cfg.host[strcspn(cfg.host, ":")] = '\0';
	502
	503	/*
	504	* Remove any remaining whitespace from the hostname.
	505	*/
	506	{
	507	int p1 = 0, p2 = 0;
	508	while (cfg.host[p2] != '\0') {
	509	if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') {
	510	cfg.host[p1] = cfg.host[p2];
	511	p1++;
	512	}
	513	p2++;
	514	}
	515	cfg.host[p1] = '\0';
	516	}
	517
	518	if (!*cfg.remote_cmd_ptr)
	519	flags \|= FLAG_INTERACTIVE;
	520
	521	/*
	522	* Select protocol. This is farmed out into a table in a
	523	* separate file to enable an ssh-free variant.
	524	*/
	525	{
	526	int i;
	527	back = NULL;
	528	for (i = 0; backends[i].backend != NULL; i++)
	529	if (backends[i].protocol == cfg.protocol) {
	530	back = backends[i].backend;
	531	break;
	532	}
	533	if (back == NULL) {
	534	fprintf(stderr,
	535	"Internal fault: Unsupported protocol found\n");
	536	return 1;
	537	}
	538	}
	539
	540	/*
	541	* Select port.
	542	*/
	543	if (portnumber != -1)
	544	cfg.port = portnumber;
	545
5673d44e	546	/*
	547	* Set up the pipe we'll use to tell us about SIGWINCH.
	548	*/
	549	if (pipe(signalpipe) < 0) {
	550	perror("pipe");
	551	exit(1);
	552	}
	553	putty_signal(SIGWINCH, sigwinch);
	554
c5e438ec	555	sk_init();
0ff9ea38	556	uxsel_init();
c5e438ec	557
	558	/*
	559	* Start up the connection.
	560	*/
c229ef97	561	logctx = log_init(NULL, &cfg);
b51259f6	562	console_provide_logctx(logctx);
c5e438ec	563	{
cbe2d68f	564	const char *error;
c5e438ec	565	char *realhost;
	566	/* nodelay is only useful if stdin is a terminal device */
	567	int nodelay = cfg.tcp_nodelay && isatty(0);
	568
86916870	569	error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port,
79bf227b	570	&realhost, nodelay, cfg.tcp_keepalives);
c5e438ec	571	if (error) {
984992ef	572	fprintf(stderr, "Unable to open connection:\n%s\n", error);
c5e438ec	573	return 1;
c5e438ec	574	}
c5e438ec	575	back->provide_logctx(backhandle, logctx);
fe5634f6	576	ldisc = ldisc_create(&cfg, NULL, back, backhandle, NULL);
c5e438ec	577	sfree(realhost);
	578	}
	579	connopen = 1;
	580
	581	/*
	582	* Set up the initial console mode. We don't care if this call
	583	* fails, because we know we aren't necessarily running in a
	584	* console.
	585	*/
	586	tcgetattr(0, &orig_termios);
	587	atexit(cleanup_termios);
	588	ldisc_update(NULL, 1, 1);
	589	sending = FALSE;
39934deb	590	now = GETTICKCOUNT();
c5e438ec	591
	592	while (1) {
	593	fd_set rset, wset, xset;
	594	int maxfd;
	595	int rwx;
	596	int ret;
	597
	598	FD_ZERO(&rset);
	599	FD_ZERO(&wset);
	600	FD_ZERO(&xset);
	601	maxfd = 0;
	602
5673d44e	603	FD_SET_MAX(signalpipe[0], maxfd, rset);
5673d44e	604
c5e438ec	605	if (connopen && !sending &&
	606	back->socket(backhandle) != NULL &&
	607	back->sendok(backhandle) &&
	608	back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
	609	/* If we're OK to send, then try to read from stdin. */
	610	FD_SET_MAX(0, maxfd, rset);
	611	}
	612
	613	if (bufchain_size(&stdout_data) > 0) {
	614	/* If we have data for stdout, try to write to stdout. */
	615	FD_SET_MAX(1, maxfd, wset);
	616	}
	617
	618	if (bufchain_size(&stderr_data) > 0) {
	619	/* If we have data for stderr, try to write to stderr. */
	620	FD_SET_MAX(2, maxfd, wset);
	621	}
	622
0ff9ea38	623	/* Count the currently active fds. */
c5e438ec	624	i = 0;
0ff9ea38	625	for (fd = first_fd(&fdstate, &rwx); fd >= 0;
0ff9ea38	626	fd = next_fd(&fdstate, &rwx)) i++;
c5e438ec	627
0ff9ea38	628	/* Expand the fdlist buffer if necessary. */
	629	if (i > fdsize) {
	630	fdsize = i + 16;
	631	fdlist = sresize(fdlist, fdsize, int);
c5e438ec	632	}
	633
	634	/*
0ff9ea38	635	* Add all currently open fds to the select sets, and store
0ff9ea38	636	* them in fdlist as well.
c5e438ec	637	*/
0ff9ea38	638	fdcount = 0;
	639	for (fd = first_fd(&fdstate, &rwx); fd >= 0;
	640	fd = next_fd(&fdstate, &rwx)) {
	641	fdlist[fdcount++] = fd;
c5e438ec	642	if (rwx & 1)
0ff9ea38	643	FD_SET_MAX(fd, maxfd, rset);
c5e438ec	644	if (rwx & 2)
0ff9ea38	645	FD_SET_MAX(fd, maxfd, wset);
c5e438ec	646	if (rwx & 4)
0ff9ea38	647	FD_SET_MAX(fd, maxfd, xset);
c5e438ec	648	}
c5e438ec	649
5673d44e	650	do {
39934deb	651	long next, ticks;
	652	struct timeval tv, *ptv;
	653
	654	if (run_timers(now, &next)) {
	655	ticks = next - GETTICKCOUNT();
	656	if (ticks < 0) ticks = 0; /* just in case */
	657	tv.tv_sec = ticks / 1000;
	658	tv.tv_usec = ticks % 1000 * 1000;
	659	ptv = &tv;
	660	} else {
	661	ptv = NULL;
	662	}
	663	ret = select(maxfd, &rset, &wset, &xset, ptv);
	664	if (ret == 0)
	665	now = next;
	666	else
	667	now = GETTICKCOUNT();
5673d44e	668	} while (ret < 0 && errno == EINTR);
c5e438ec	669
	670	if (ret < 0) {
	671	perror("select");
	672	exit(1);
	673	}
	674
0ff9ea38	675	for (i = 0; i < fdcount; i++) {
0ff9ea38	676	fd = fdlist[i];
56e5b2db	677	/*
	678	* We must process exceptional notifications before
	679	* ordinary readability ones, or we may go straight
	680	* past the urgent marker.
	681	*/
0ff9ea38	682	if (FD_ISSET(fd, &xset))
	683	select_result(fd, 4);
	684	if (FD_ISSET(fd, &rset))
	685	select_result(fd, 1);
	686	if (FD_ISSET(fd, &wset))
	687	select_result(fd, 2);
c5e438ec	688	}
c5e438ec	689
5673d44e	690	if (FD_ISSET(signalpipe[0], &rset)) {
	691	char c[1];
	692	struct winsize size;
	693	read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */
	694	if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
	695	back->size(backhandle, size.ws_col, size.ws_row);
	696	}
	697
c5e438ec	698	if (FD_ISSET(0, &rset)) {
	699	char buf[4096];
	700	int ret;
	701
	702	if (connopen && back->socket(backhandle) != NULL) {
	703	ret = read(0, buf, sizeof(buf));
	704	if (ret < 0) {
	705	perror("stdin: read");
	706	exit(1);
	707	} else if (ret == 0) {
	708	back->special(backhandle, TS_EOF);
	709	sending = FALSE; /* send nothing further after this */
	710	} else {
	711	back->send(backhandle, buf, ret);
	712	}
	713	}
	714	}
	715
	716	if (FD_ISSET(1, &wset)) {
	717	try_output(0);
	718	}
	719
	720	if (FD_ISSET(2, &wset)) {
	721	try_output(1);
	722	}
	723
	724	if ((!connopen \|\| back->socket(backhandle) == NULL) &&
	725	bufchain_size(&stdout_data) == 0 &&
	726	bufchain_size(&stderr_data) == 0)
	727	break; /* we closed the connection */
	728	}
	729	exitcode = back->exitcode(backhandle);
	730	if (exitcode < 0) {
	731	fprintf(stderr, "Remote process exit code unavailable\n");
	732	exitcode = 1; /* this is an error condition */
	733	}
d9c40fd6	734	cleanup_exit(exitcode);
d9c40fd6	735	return exitcode; /* shouldn't happen, but placates gcc */
c5e438ec	736	}