[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>

#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, "X11Display"))
	return dupstr(getenv("DISPLAY"));
    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;

    assert(len > 0);

    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        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-port   Dynamic SOCKS-based port forwarding\n");
    printf("  -L listen-port:host:port   Forward local port to "
	   "remote address\n");
    printf("  -R listen-port:host:port   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);
}

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;

    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);
    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, "-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;
		    /*
		     * 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;

    /*
     * 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);
	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;

    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 {
	    ret = select(maxfd, &rset, &wset, &xset, NULL);
	} 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>
c5e438ec	16
c5e438ec	17	#define PUTTY_DO_GLOBALS /* actually _define_ globals */
	18	#include "putty.h"
	19	#include "storage.h"
	20	#include "tree234.h"
	21
	22	#define MAX_STDIN_BACKLOG 4096
	23
	24	void fatalbox(char *p, ...)
	25	{
	26	va_list ap;
	27	fprintf(stderr, "FATAL ERROR: ");
	28	va_start(ap, p);
	29	vfprintf(stderr, p, ap);
	30	va_end(ap);
	31	fputc('\n', stderr);
	32	cleanup_exit(1);
	33	}
	34	void modalfatalbox(char *p, ...)
	35	{
	36	va_list ap;
	37	fprintf(stderr, "FATAL ERROR: ");
	38	va_start(ap, p);
	39	vfprintf(stderr, p, ap);
	40	va_end(ap);
	41	fputc('\n', stderr);
	42	cleanup_exit(1);
	43	}
	44	void connection_fatal(void frontend, char p, ...)
	45	{
	46	va_list ap;
	47	fprintf(stderr, "FATAL ERROR: ");
	48	va_start(ap, p);
	49	vfprintf(stderr, p, ap);
	50	va_end(ap);
	51	fputc('\n', stderr);
	52	cleanup_exit(1);
	53	}
	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	}
	64
	65	struct termios orig_termios;
	66
	67	static Backend *back;
	68	static void *backhandle;
3ea863a3	69	static Config cfg;
c5e438ec	70
5a9eb105	71	/*
	72	* Default settings that are specific to pterm.
	73	*/
c85623f9	74	char platform_default_s(const char name)
5a9eb105	75	{
5a9eb105	76	if (!strcmp(name, "X11Display"))
799dfcfa	77	return dupstr(getenv("DISPLAY"));
5a9eb105	78	if (!strcmp(name, "TermType"))
799dfcfa	79	return dupstr(getenv("TERM"));
	80	if (!strcmp(name, "UserName"))
	81	return get_username();
5a9eb105	82	return NULL;
	83	}
	84
c85623f9	85	int platform_default_i(const char *name, int def)
5a9eb105	86	{
	87	if (!strcmp(name, "TermWidth") \|\|
	88	!strcmp(name, "TermHeight")) {
	89	struct winsize size;
	90	if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
	91	return (!strcmp(name, "TermWidth") ? size.ws_col : size.ws_row);
	92	}
	93	return def;
	94	}
	95
9a30e26b	96	FontSpec platform_default_fontspec(const char *name)
	97	{
	98	FontSpec ret;
	99	*ret.name = '\0';
	100	return ret;
	101	}
	102
	103	Filename platform_default_filename(const char *name)
	104	{
	105	Filename ret;
	106	if (!strcmp(name, "LogFileName"))
	107	strcpy(ret.path, "putty.log");
	108	else
	109	*ret.path = '\0';
	110	return ret;
	111	}
	112
c85623f9	113	char x_get_default(const char key)
c5e438ec	114	{
	115	return NULL; /* this is a stub */
	116	}
	117	int term_ldisc(Terminal *term, int mode)
	118	{
	119	return FALSE;
	120	}
	121	void ldisc_update(void *frontend, int echo, int edit)
	122	{
	123	/* Update stdin read mode to reflect changes in line discipline. */
	124	struct termios mode;
	125
	126	mode = orig_termios;
	127
	128	if (echo)
	129	mode.c_lflag \|= ECHO;
	130	else
	131	mode.c_lflag &= ~ECHO;
	132
	133	if (edit)
	134	mode.c_lflag \|= ISIG \| ICANON;
	135	else
	136	mode.c_lflag &= ~(ISIG \| ICANON);
	137
	138	tcsetattr(0, TCSANOW, &mode);
	139	}
	140
	141	void cleanup_termios(void)
	142	{
	143	tcsetattr(0, TCSANOW, &orig_termios);
	144	}
	145
	146	bufchain stdout_data, stderr_data;
	147
	148	void try_output(int is_stderr)
	149	{
	150	bufchain *chain = (is_stderr ? &stderr_data : &stdout_data);
	151	int fd = (is_stderr ? 2 : 1);
	152	void *senddata;
	153	int sendlen, ret;
	154
d69a46c0	155	if (bufchain_size(chain) == 0)
	156	return;
	157
c5e438ec	158	bufchain_prefix(chain, &senddata, &sendlen);
	159	ret = write(fd, senddata, sendlen);
	160	if (ret > 0)
	161	bufchain_consume(chain, ret);
	162	else if (ret < 0) {
	163	perror(is_stderr ? "stderr: write" : "stdout: write");
	164	exit(1);
	165	}
	166	}
	167
9fab77dc	168	int from_backend(void *frontend_handle, int is_stderr,
9fab77dc	169	const char *data, int len)
c5e438ec	170	{
	171	int osize, esize;
	172
	173	assert(len > 0);
	174
	175	if (is_stderr) {
	176	bufchain_add(&stderr_data, data, len);
	177	try_output(1);
	178	} else {
	179	bufchain_add(&stdout_data, data, len);
	180	try_output(0);
	181	}
	182
	183	osize = bufchain_size(&stdout_data);
	184	esize = bufchain_size(&stderr_data);
	185
	186	return osize + esize;
	187	}
	188
5673d44e	189	int signalpipe[2];
	190
	191	void sigwinch(int signum)
	192	{
	193	write(signalpipe[1], "x", 1);
	194	}
	195
c5e438ec	196	/*
74aca06d	197	* In Plink our selects are synchronous, so these functions are
	198	* empty stubs.
	199	*/
	200	int uxsel_input_add(int fd, int rwx) { return 0; }
	201	void uxsel_input_remove(int id) { }
	202
	203	/*
c5e438ec	204	* Short description of parameters.
	205	*/
	206	static void usage(void)
	207	{
	208	printf("PuTTY Link: command-line connection utility\n");
	209	printf("%s\n", ver);
	210	printf("Usage: plink [options] [user@]host [command]\n");
	211	printf(" (\"host\" can also be a PuTTY saved session name)\n");
	212	printf("Options:\n");
	213	printf(" -v show verbose messages\n");
	214	printf(" -load sessname Load settings from saved session\n");
	215	printf(" -ssh -telnet -rlogin -raw\n");
	216	printf(" force use of a particular protocol (default SSH)\n");
	217	printf(" -P port connect to specified port\n");
	218	printf(" -l user connect with specified username\n");
	219	printf(" -m file read remote command(s) from file\n");
	220	printf(" -batch disable all interactive prompts\n");
	221	printf("The following options only apply to SSH connections:\n");
	222	printf(" -pw passw login with specified password\n");
820ebe3b	223	printf(" -D listen-port Dynamic SOCKS-based port forwarding\n");
c5e438ec	224	printf(" -L listen-port:host:port Forward local port to "
	225	"remote address\n");
	226	printf(" -R listen-port:host:port Forward remote port to"
	227	" local address\n");
	228	printf(" -X -x enable / disable X11 forwarding\n");
	229	printf(" -A -a enable / disable agent forwarding\n");
	230	printf(" -t -T enable / disable pty allocation\n");
	231	printf(" -1 -2 force use of particular protocol version\n");
	232	printf(" -C enable compression\n");
	233	printf(" -i key private key file for authentication\n");
09bdfcbb	234	printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
c5e438ec	235	exit(1);
	236	}
	237
	238	int main(int argc, char **argv)
	239	{
	240	int sending;
	241	int portnumber = -1;
0ff9ea38	242	int *fdlist;
	243	int fd;
	244	int i, fdcount, fdsize, fdstate;
c5e438ec	245	int connopen;
c5e438ec	246	int exitcode;
86256dc6	247	int errors;
09bdfcbb	248	int use_subsystem = 0;
b51259f6	249	void ldisc, logctx;
c5e438ec	250
	251	ssh_get_line = console_get_line;
	252
0ff9ea38	253	fdlist = NULL;
0ff9ea38	254	fdcount = fdsize = 0;
c5e438ec	255	/*
	256	* Initialise port and protocol to sensible defaults. (These
	257	* will be overridden by more or less anything.)
	258	*/
	259	default_protocol = PROT_SSH;
	260	default_port = 22;
	261
	262	flags = FLAG_STDERR;
	263	/*
	264	* Process the command line.
	265	*/
	266	do_defaults(NULL, &cfg);
	267	default_protocol = cfg.protocol;
	268	default_port = cfg.port;
86256dc6	269	errors = 0;
c5e438ec	270	{
	271	/*
	272	* Override the default protocol if PLINK_PROTOCOL is set.
	273	*/
	274	char *p = getenv("PLINK_PROTOCOL");
	275	int i;
	276	if (p) {
	277	for (i = 0; backends[i].backend != NULL; i++) {
	278	if (!strcmp(backends[i].name, p)) {
	279	default_protocol = cfg.protocol = backends[i].protocol;
	280	default_port = cfg.port =
	281	backends[i].backend->default_port;
	282	break;
	283	}
	284	}
	285	}
	286	}
	287	while (--argc) {
	288	char p = ++argv;
	289	if (*p == '-') {
9b41d3a8	290	int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
9b41d3a8	291	1, &cfg);
c5e438ec	292	if (ret == -2) {
	293	fprintf(stderr,
	294	"plink: option \"%s\" requires an argument\n", p);
86256dc6	295	errors = 1;
c5e438ec	296	} else if (ret == 2) {
	297	--argc, ++argv;
	298	} else if (ret == 1) {
	299	continue;
	300	} else if (!strcmp(p, "-batch")) {
	301	console_batch_mode = 1;
09bdfcbb	302	} else if (!strcmp(p, "-s")) {
	303	/* Save status to write to cfg later. */
	304	use_subsystem = 1;
a0e5ed33	305	} else if (!strcmp(p, "-o")) {
86256dc6	306	if (argc <= 1) {
a0e5ed33	307	fprintf(stderr,
a0e5ed33	308	"plink: option \"-o\" requires an argument\n");
86256dc6	309	errors = 1;
	310	} else {
	311	--argc;
	312	provide_xrm_string(*++argv);
	313	}
	314	} else {
	315	fprintf(stderr, "plink: unknown option \"%s\"\n", p);
	316	errors = 1;
c5e438ec	317	}
	318	} else if (*p) {
	319	if (!*cfg.host) {
	320	char *q = p;
a0e5ed33	321
	322	do_defaults(NULL, &cfg);
	323
c5e438ec	324	/*
	325	* If the hostname starts with "telnet:", set the
	326	* protocol to Telnet and process the string as a
	327	* Telnet URL.
	328	*/
	329	if (!strncmp(q, "telnet:", 7)) {
	330	char c;
	331
	332	q += 7;
	333	if (q[0] == '/' && q[1] == '/')
	334	q += 2;
	335	cfg.protocol = PROT_TELNET;
	336	p = q;
	337	while (p && p != ':' && *p != '/')
	338	p++;
	339	c = *p;
	340	if (*p)
	341	*p++ = '\0';
	342	if (c == ':')
	343	cfg.port = atoi(p);
	344	else
	345	cfg.port = -1;
	346	strncpy(cfg.host, q, sizeof(cfg.host) - 1);
	347	cfg.host[sizeof(cfg.host) - 1] = '\0';
	348	} else {
	349	char *r;
	350	/*
	351	* Before we process the [user@]host string, we
	352	* first check for the presence of a protocol
	353	* prefix (a protocol name followed by ",").
	354	*/
	355	r = strchr(p, ',');
	356	if (r) {
	357	int i, j;
	358	for (i = 0; backends[i].backend != NULL; i++) {
	359	j = strlen(backends[i].name);
	360	if (j == r - p &&
	361	!memcmp(backends[i].name, p, j)) {
	362	default_protocol = cfg.protocol =
	363	backends[i].protocol;
	364	portnumber =
	365	backends[i].backend->default_port;
	366	p = r + 1;
	367	break;
	368	}
	369	}
	370	}
	371
	372	/*
	373	* Three cases. Either (a) there's a nonzero
	374	* length string followed by an @, in which
	375	* case that's user and the remainder is host.
	376	* Or (b) there's only one string, not counting
	377	* a potential initial @, and it exists in the
	378	* saved-sessions database. Or (c) only one
	379	* string and it _doesn't_ exist in the
	380	* database.
	381	*/
	382	r = strrchr(p, '@');
	383	if (r == p)
	384	p++, r = NULL; /* discount initial @ */
	385	if (r == NULL) {
	386	/*
	387	* One string.
388	*/
389	Config cfg2;
390	do_defaults(p, &cfg2);
391	if (cfg2.host[0] == '\0') {
392	/* No settings for this host; use defaults */
393	strncpy(cfg.host, p, sizeof(cfg.host) - 1);
394	cfg.host[sizeof(cfg.host) - 1] = '\0';
395	cfg.port = default_port;
396	} else {
397	cfg = cfg2;
398	cfg.remote_cmd_ptr = cfg.remote_cmd;
399	}
400	} else {
401	*r++ = '\0';
402	strncpy(cfg.username, p, sizeof(cfg.username) - 1);
403	cfg.username[sizeof(cfg.username) - 1] = '\0';
404	strncpy(cfg.host, r, sizeof(cfg.host) - 1);
405	cfg.host[sizeof(cfg.host) - 1] = '\0';
406	cfg.port = default_port;
407	}
408	}
409	} else {
410	char *command;
411	int cmdlen, cmdsize;
412	cmdlen = cmdsize = 0;
413	command = NULL;
414
415	while (argc) {
416	while (*p) {
417	if (cmdlen >= cmdsize) {
418	cmdsize = cmdlen + 512;
3d88e64d	419	command = sresize(command, cmdsize, char);
c5e438ec	420	}
	421	command[cmdlen++]=*p++;
	422	}
	423	if (cmdlen >= cmdsize) {
	424	cmdsize = cmdlen + 512;
3d88e64d	425	command = sresize(command, cmdsize, char);
c5e438ec	426	}
	427	command[cmdlen++]=' '; /* always add trailing space */
	428	if (--argc) p = *++argv;
	429	}
	430	if (cmdlen) command[--cmdlen]='\0';
	431	/* change trailing blank to NUL */
	432	cfg.remote_cmd_ptr = command;
	433	cfg.remote_cmd_ptr2 = NULL;
	434	cfg.nopty = TRUE; /* command => no terminal */
	435
	436	break; /* done with cmdline */
	437	}
	438	}
	439	}
	440
86256dc6	441	if (errors)
	442	return 1;
	443
c5e438ec	444	if (!*cfg.host) {
	445	usage();
	446	}
	447
	448	/*
	449	* Trim leading whitespace off the hostname if it's there.
	450	*/
	451	{
	452	int space = strspn(cfg.host, " \t");
	453	memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space);
	454	}
	455
	456	/* See if host is of the form user@host */
	457	if (cfg.host[0] != '\0') {
	458	char *atsign = strchr(cfg.host, '@');
	459	/* Make sure we're not overflowing the user field */
	460	if (atsign) {
	461	if (atsign - cfg.host < sizeof cfg.username) {
	462	strncpy(cfg.username, cfg.host, atsign - cfg.host);
	463	cfg.username[atsign - cfg.host] = '\0';
	464	}
	465	memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1));
	466	}
	467	}
	468
	469	/*
	470	* Perform command-line overrides on session configuration.
	471	*/
9b41d3a8	472	cmdline_run_saved(&cfg);
c5e438ec	473
c5e438ec	474	/*
09bdfcbb	475	* Apply subsystem status.
	476	*/
	477	if (use_subsystem)
	478	cfg.ssh_subsys = TRUE;
	479
	480	/*
c5e438ec	481	* Trim a colon suffix off the hostname if it's there.
	482	*/
	483	cfg.host[strcspn(cfg.host, ":")] = '\0';
	484
	485	/*
	486	* Remove any remaining whitespace from the hostname.
	487	*/
	488	{
	489	int p1 = 0, p2 = 0;
	490	while (cfg.host[p2] != '\0') {
	491	if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') {
	492	cfg.host[p1] = cfg.host[p2];
	493	p1++;
	494	}
	495	p2++;
	496	}
	497	cfg.host[p1] = '\0';
	498	}
	499
	500	if (!*cfg.remote_cmd_ptr)
	501	flags \|= FLAG_INTERACTIVE;
	502
	503	/*
	504	* Select protocol. This is farmed out into a table in a
	505	* separate file to enable an ssh-free variant.
	506	*/
	507	{
	508	int i;
	509	back = NULL;
	510	for (i = 0; backends[i].backend != NULL; i++)
	511	if (backends[i].protocol == cfg.protocol) {
	512	back = backends[i].backend;
	513	break;
	514	}
	515	if (back == NULL) {
	516	fprintf(stderr,
	517	"Internal fault: Unsupported protocol found\n");
	518	return 1;
	519	}
	520	}
	521
	522	/*
	523	* Select port.
	524	*/
	525	if (portnumber != -1)
	526	cfg.port = portnumber;
	527
5673d44e	528	/*
	529	* Set up the pipe we'll use to tell us about SIGWINCH.
	530	*/
	531	if (pipe(signalpipe) < 0) {
	532	perror("pipe");
	533	exit(1);
	534	}
	535	putty_signal(SIGWINCH, sigwinch);
	536
c5e438ec	537	sk_init();
0ff9ea38	538	uxsel_init();
c5e438ec	539
	540	/*
	541	* Start up the connection.
	542	*/
c229ef97	543	logctx = log_init(NULL, &cfg);
b51259f6	544	console_provide_logctx(logctx);
c5e438ec	545	{
cbe2d68f	546	const char *error;
c5e438ec	547	char *realhost;
	548	/* nodelay is only useful if stdin is a terminal device */
	549	int nodelay = cfg.tcp_nodelay && isatty(0);
	550
86916870	551	error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port,
c5e438ec	552	&realhost, nodelay);
c5e438ec	553	if (error) {
984992ef	554	fprintf(stderr, "Unable to open connection:\n%s\n", error);
c5e438ec	555	return 1;
c5e438ec	556	}
c5e438ec	557	back->provide_logctx(backhandle, logctx);
fe5634f6	558	ldisc = ldisc_create(&cfg, NULL, back, backhandle, NULL);
c5e438ec	559	sfree(realhost);
	560	}
	561	connopen = 1;
	562
	563	/*
	564	* Set up the initial console mode. We don't care if this call
	565	* fails, because we know we aren't necessarily running in a
	566	* console.
	567	*/
	568	tcgetattr(0, &orig_termios);
	569	atexit(cleanup_termios);
	570	ldisc_update(NULL, 1, 1);
	571	sending = FALSE;
	572
	573	while (1) {
	574	fd_set rset, wset, xset;
	575	int maxfd;
	576	int rwx;
	577	int ret;
	578
	579	FD_ZERO(&rset);
	580	FD_ZERO(&wset);
	581	FD_ZERO(&xset);
	582	maxfd = 0;
	583
5673d44e	584	FD_SET_MAX(signalpipe[0], maxfd, rset);
5673d44e	585
c5e438ec	586	if (connopen && !sending &&
	587	back->socket(backhandle) != NULL &&
	588	back->sendok(backhandle) &&
	589	back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
	590	/* If we're OK to send, then try to read from stdin. */
	591	FD_SET_MAX(0, maxfd, rset);
	592	}
	593
	594	if (bufchain_size(&stdout_data) > 0) {
	595	/* If we have data for stdout, try to write to stdout. */
	596	FD_SET_MAX(1, maxfd, wset);
	597	}
	598
	599	if (bufchain_size(&stderr_data) > 0) {
	600	/* If we have data for stderr, try to write to stderr. */
	601	FD_SET_MAX(2, maxfd, wset);
	602	}
	603
0ff9ea38	604	/* Count the currently active fds. */
c5e438ec	605	i = 0;
0ff9ea38	606	for (fd = first_fd(&fdstate, &rwx); fd >= 0;
0ff9ea38	607	fd = next_fd(&fdstate, &rwx)) i++;
c5e438ec	608
0ff9ea38	609	/* Expand the fdlist buffer if necessary. */
	610	if (i > fdsize) {
	611	fdsize = i + 16;
	612	fdlist = sresize(fdlist, fdsize, int);
c5e438ec	613	}
	614
	615	/*
0ff9ea38	616	* Add all currently open fds to the select sets, and store
0ff9ea38	617	* them in fdlist as well.
c5e438ec	618	*/
0ff9ea38	619	fdcount = 0;
	620	for (fd = first_fd(&fdstate, &rwx); fd >= 0;
	621	fd = next_fd(&fdstate, &rwx)) {
	622	fdlist[fdcount++] = fd;
c5e438ec	623	if (rwx & 1)
0ff9ea38	624	FD_SET_MAX(fd, maxfd, rset);
c5e438ec	625	if (rwx & 2)
0ff9ea38	626	FD_SET_MAX(fd, maxfd, wset);
c5e438ec	627	if (rwx & 4)
0ff9ea38	628	FD_SET_MAX(fd, maxfd, xset);
c5e438ec	629	}
c5e438ec	630
5673d44e	631	do {
	632	ret = select(maxfd, &rset, &wset, &xset, NULL);
	633	} while (ret < 0 && errno == EINTR);
c5e438ec	634
	635	if (ret < 0) {
	636	perror("select");
	637	exit(1);
	638	}
	639
0ff9ea38	640	for (i = 0; i < fdcount; i++) {
0ff9ea38	641	fd = fdlist[i];
56e5b2db	642	/*
	643	* We must process exceptional notifications before
	644	* ordinary readability ones, or we may go straight
	645	* past the urgent marker.
	646	*/
0ff9ea38	647	if (FD_ISSET(fd, &xset))
	648	select_result(fd, 4);
	649	if (FD_ISSET(fd, &rset))
	650	select_result(fd, 1);
	651	if (FD_ISSET(fd, &wset))
	652	select_result(fd, 2);
c5e438ec	653	}
c5e438ec	654
5673d44e	655	if (FD_ISSET(signalpipe[0], &rset)) {
	656	char c[1];
	657	struct winsize size;
	658	read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */
	659	if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
	660	back->size(backhandle, size.ws_col, size.ws_row);
	661	}
	662
c5e438ec	663	if (FD_ISSET(0, &rset)) {
	664	char buf[4096];
	665	int ret;
	666
	667	if (connopen && back->socket(backhandle) != NULL) {
	668	ret = read(0, buf, sizeof(buf));
	669	if (ret < 0) {
	670	perror("stdin: read");
	671	exit(1);
	672	} else if (ret == 0) {
	673	back->special(backhandle, TS_EOF);
	674	sending = FALSE; /* send nothing further after this */
	675	} else {
	676	back->send(backhandle, buf, ret);
	677	}
	678	}
	679	}
	680
	681	if (FD_ISSET(1, &wset)) {
	682	try_output(0);
	683	}
	684
	685	if (FD_ISSET(2, &wset)) {
	686	try_output(1);
	687	}
	688
	689	if ((!connopen \|\| back->socket(backhandle) == NULL) &&
	690	bufchain_size(&stdout_data) == 0 &&
	691	bufchain_size(&stderr_data) == 0)
	692	break; /* we closed the connection */
	693	}
	694	exitcode = back->exitcode(backhandle);
	695	if (exitcode < 0) {
	696	fprintf(stderr, "Remote process exit code unavailable\n");
	697	exitcode = 1; /* this is an error condition */
	698	}
d9c40fd6	699	cleanup_exit(exitcode);
d9c40fd6	700	return exitcode; /* shouldn't happen, but placates gcc */
c5e438ec	701	}