[u/mdw/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;

    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 (default SSH)\n");
    printf("  -P port   connect to specified port\n");
    printf("  -l user   connect with specified username\n");
    printf("  -m file   read remote command(s) from file\n");
    printf("  -batch    disable all interactive prompts\n");
    printf("The following options only apply to SSH connections:\n");
    printf("  -pw passw login with specified password\n");
    printf("  -D [listen-IP:]listen-port\n");
    printf("            Dynamic SOCKS-based port forwarding\n");
    printf("  -L [listen-IP:]listen-port:host:port\n");
    printf("            Forward local port to remote address\n");
    printf("  -R [listen-IP:]listen-port:host:port\n");
    printf("            Forward remote port to local address\n");
    printf("  -X -x     enable / disable X11 forwarding\n");
    printf("  -A -a     enable / disable agent forwarding\n");
    printf("  -t -T     enable / disable pty allocation\n");
    printf("  -1 -2     force use of particular protocol version\n");
    printf("  -C        enable compression\n");
    printf("  -i key    private key file for authentication\n");
    printf("  -s        remote command is an SSH subsystem (SSH-2 only)\n");
    exit(1);
}

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;

    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, "-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;
		    /*
		     * 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, 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;

    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
c5e438ec	173	if (is_stderr) {
	174	bufchain_add(&stderr_data, data, len);
	175	try_output(1);
	176	} else {
	177	bufchain_add(&stdout_data, data, len);
	178	try_output(0);
	179	}
	180
	181	osize = bufchain_size(&stdout_data);
	182	esize = bufchain_size(&stderr_data);
	183
	184	return osize + esize;
	185	}
	186
5673d44e	187	int signalpipe[2];
	188
	189	void sigwinch(int signum)
	190	{
	191	write(signalpipe[1], "x", 1);
	192	}
	193
c5e438ec	194	/*
74aca06d	195	* In Plink our selects are synchronous, so these functions are
	196	* empty stubs.
	197	*/
	198	int uxsel_input_add(int fd, int rwx) { return 0; }
	199	void uxsel_input_remove(int id) { }
	200
	201	/*
c5e438ec	202	* Short description of parameters.
	203	*/
	204	static void usage(void)
	205	{
	206	printf("PuTTY Link: command-line connection utility\n");
	207	printf("%s\n", ver);
	208	printf("Usage: plink [options] [user@]host [command]\n");
	209	printf(" (\"host\" can also be a PuTTY saved session name)\n");
	210	printf("Options:\n");
c9a13be6	211	printf(" -V print version information\n");
c5e438ec	212	printf(" -v show verbose messages\n");
	213	printf(" -load sessname Load settings from saved session\n");
	214	printf(" -ssh -telnet -rlogin -raw\n");
	215	printf(" force use of a particular protocol (default SSH)\n");
	216	printf(" -P port connect to specified port\n");
	217	printf(" -l user connect with specified username\n");
	218	printf(" -m file read remote command(s) from file\n");
	219	printf(" -batch disable all interactive prompts\n");
	220	printf("The following options only apply to SSH connections:\n");
	221	printf(" -pw passw login with specified password\n");
dbe6c525	222	printf(" -D [listen-IP:]listen-port\n");
	223	printf(" Dynamic SOCKS-based port forwarding\n");
	224	printf(" -L [listen-IP:]listen-port:host:port\n");
	225	printf(" Forward local port to remote address\n");
	226	printf(" -R [listen-IP:]listen-port:host:port\n");
	227	printf(" Forward remote port to local address\n");
c5e438ec	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");
dc108ebc	235	exit(1);
	236	}
	237
	238	static void version(void)
	239	{
	240	printf("plink: %s\n", ver);
c5e438ec	241	exit(1);
	242	}
	243
	244	int main(int argc, char **argv)
	245	{
	246	int sending;
	247	int portnumber = -1;
0ff9ea38	248	int *fdlist;
	249	int fd;
	250	int i, fdcount, fdsize, fdstate;
c5e438ec	251	int connopen;
c5e438ec	252	int exitcode;
86256dc6	253	int errors;
09bdfcbb	254	int use_subsystem = 0;
b51259f6	255	void ldisc, logctx;
c5e438ec	256
	257	ssh_get_line = console_get_line;
	258
0ff9ea38	259	fdlist = NULL;
0ff9ea38	260	fdcount = fdsize = 0;
c5e438ec	261	/*
	262	* Initialise port and protocol to sensible defaults. (These
	263	* will be overridden by more or less anything.)
	264	*/
	265	default_protocol = PROT_SSH;
	266	default_port = 22;
	267
	268	flags = FLAG_STDERR;
	269	/*
	270	* Process the command line.
	271	*/
	272	do_defaults(NULL, &cfg);
	273	default_protocol = cfg.protocol;
	274	default_port = cfg.port;
86256dc6	275	errors = 0;
c5e438ec	276	{
	277	/*
	278	* Override the default protocol if PLINK_PROTOCOL is set.
	279	*/
	280	char *p = getenv("PLINK_PROTOCOL");
	281	int i;
	282	if (p) {
	283	for (i = 0; backends[i].backend != NULL; i++) {
	284	if (!strcmp(backends[i].name, p)) {
	285	default_protocol = cfg.protocol = backends[i].protocol;
	286	default_port = cfg.port =
	287	backends[i].backend->default_port;
	288	break;
	289	}
	290	}
	291	}
	292	}
	293	while (--argc) {
	294	char p = ++argv;
	295	if (*p == '-') {
9b41d3a8	296	int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
9b41d3a8	297	1, &cfg);
c5e438ec	298	if (ret == -2) {
	299	fprintf(stderr,
	300	"plink: option \"%s\" requires an argument\n", p);
86256dc6	301	errors = 1;
c5e438ec	302	} else if (ret == 2) {
	303	--argc, ++argv;
	304	} else if (ret == 1) {
	305	continue;
	306	} else if (!strcmp(p, "-batch")) {
	307	console_batch_mode = 1;
09bdfcbb	308	} else if (!strcmp(p, "-s")) {
	309	/* Save status to write to cfg later. */
	310	use_subsystem = 1;
dc108ebc	311	} else if (!strcmp(p, "-V")) {
dc108ebc	312	version();
a0e5ed33	313	} else if (!strcmp(p, "-o")) {
86256dc6	314	if (argc <= 1) {
a0e5ed33	315	fprintf(stderr,
a0e5ed33	316	"plink: option \"-o\" requires an argument\n");
86256dc6	317	errors = 1;
	318	} else {
	319	--argc;
	320	provide_xrm_string(*++argv);
	321	}
	322	} else {
	323	fprintf(stderr, "plink: unknown option \"%s\"\n", p);
	324	errors = 1;
c5e438ec	325	}
	326	} else if (*p) {
	327	if (!*cfg.host) {
	328	char *q = p;
a0e5ed33	329
	330	do_defaults(NULL, &cfg);
	331
c5e438ec	332	/*
	333	* If the hostname starts with "telnet:", set the
	334	* protocol to Telnet and process the string as a
	335	* Telnet URL.
	336	*/
	337	if (!strncmp(q, "telnet:", 7)) {
	338	char c;
	339
	340	q += 7;
	341	if (q[0] == '/' && q[1] == '/')
	342	q += 2;
	343	cfg.protocol = PROT_TELNET;
	344	p = q;
	345	while (p && p != ':' && *p != '/')
	346	p++;
	347	c = *p;
	348	if (*p)
	349	*p++ = '\0';
	350	if (c == ':')
	351	cfg.port = atoi(p);
	352	else
	353	cfg.port = -1;
	354	strncpy(cfg.host, q, sizeof(cfg.host) - 1);
	355	cfg.host[sizeof(cfg.host) - 1] = '\0';
	356	} else {
	357	char *r;
	358	/*
	359	* Before we process the [user@]host string, we
	360	* first check for the presence of a protocol
	361	* prefix (a protocol name followed by ",").
	362	*/
	363	r = strchr(p, ',');
	364	if (r) {
	365	int i, j;
	366	for (i = 0; backends[i].backend != NULL; i++) {
	367	j = strlen(backends[i].name);
	368	if (j == r - p &&
	369	!memcmp(backends[i].name, p, j)) {
	370	default_protocol = cfg.protocol =
	371	backends[i].protocol;
	372	portnumber =
	373	backends[i].backend->default_port;
	374	p = r + 1;
	375	break;
	376	}
	377	}
	378	}
	379
	380	/*
	381	* Three cases. Either (a) there's a nonzero
	382	* length string followed by an @, in which
	383	* case that's user and the remainder is host.
	384	* Or (b) there's only one string, not counting
	385	* a potential initial @, and it exists in the
	386	* saved-sessions database. Or (c) only one
	387	* string and it _doesn't_ exist in the
	388	* database.
	389	*/
	390	r = strrchr(p, '@');
	391	if (r == p)
	392	p++, r = NULL; /* discount initial @ */
	393	if (r == NULL) {
	394	/*
	395	* One string.
396	*/
397	Config cfg2;
398	do_defaults(p, &cfg2);
399	if (cfg2.host[0] == '\0') {
400	/* No settings for this host; use defaults */
401	strncpy(cfg.host, p, sizeof(cfg.host) - 1);
402	cfg.host[sizeof(cfg.host) - 1] = '\0';
403	cfg.port = default_port;
404	} else {
405	cfg = cfg2;
406	cfg.remote_cmd_ptr = cfg.remote_cmd;
407	}
408	} else {
409	*r++ = '\0';
410	strncpy(cfg.username, p, sizeof(cfg.username) - 1);
411	cfg.username[sizeof(cfg.username) - 1] = '\0';
412	strncpy(cfg.host, r, sizeof(cfg.host) - 1);
413	cfg.host[sizeof(cfg.host) - 1] = '\0';
414	cfg.port = default_port;
415	}
416	}
417	} else {
418	char *command;
419	int cmdlen, cmdsize;
420	cmdlen = cmdsize = 0;
421	command = NULL;
422
423	while (argc) {
424	while (*p) {
425	if (cmdlen >= cmdsize) {
426	cmdsize = cmdlen + 512;
3d88e64d	427	command = sresize(command, cmdsize, char);
c5e438ec	428	}
	429	command[cmdlen++]=*p++;
	430	}
	431	if (cmdlen >= cmdsize) {
	432	cmdsize = cmdlen + 512;
3d88e64d	433	command = sresize(command, cmdsize, char);
c5e438ec	434	}
	435	command[cmdlen++]=' '; /* always add trailing space */
	436	if (--argc) p = *++argv;
	437	}
	438	if (cmdlen) command[--cmdlen]='\0';
	439	/* change trailing blank to NUL */
	440	cfg.remote_cmd_ptr = command;
	441	cfg.remote_cmd_ptr2 = NULL;
	442	cfg.nopty = TRUE; /* command => no terminal */
	443
	444	break; /* done with cmdline */
	445	}
	446	}
	447	}
	448
86256dc6	449	if (errors)
	450	return 1;
	451
c5e438ec	452	if (!*cfg.host) {
	453	usage();
	454	}
	455
	456	/*
	457	* Trim leading whitespace off the hostname if it's there.
	458	*/
	459	{
	460	int space = strspn(cfg.host, " \t");
	461	memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space);
	462	}
	463
	464	/* See if host is of the form user@host */
	465	if (cfg.host[0] != '\0') {
	466	char *atsign = strchr(cfg.host, '@');
	467	/* Make sure we're not overflowing the user field */
	468	if (atsign) {
	469	if (atsign - cfg.host < sizeof cfg.username) {
	470	strncpy(cfg.username, cfg.host, atsign - cfg.host);
	471	cfg.username[atsign - cfg.host] = '\0';
	472	}
	473	memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1));
	474	}
	475	}
	476
	477	/*
	478	* Perform command-line overrides on session configuration.
	479	*/
9b41d3a8	480	cmdline_run_saved(&cfg);
c5e438ec	481
c5e438ec	482	/*
09bdfcbb	483	* Apply subsystem status.
	484	*/
	485	if (use_subsystem)
	486	cfg.ssh_subsys = TRUE;
	487
	488	/*
c5e438ec	489	* Trim a colon suffix off the hostname if it's there.
	490	*/
	491	cfg.host[strcspn(cfg.host, ":")] = '\0';
	492
	493	/*
	494	* Remove any remaining whitespace from the hostname.
	495	*/
	496	{
	497	int p1 = 0, p2 = 0;
	498	while (cfg.host[p2] != '\0') {
	499	if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') {
	500	cfg.host[p1] = cfg.host[p2];
	501	p1++;
	502	}
	503	p2++;
	504	}
	505	cfg.host[p1] = '\0';
	506	}
	507
	508	if (!*cfg.remote_cmd_ptr)
	509	flags \|= FLAG_INTERACTIVE;
	510
	511	/*
	512	* Select protocol. This is farmed out into a table in a
	513	* separate file to enable an ssh-free variant.
	514	*/
	515	{
	516	int i;
	517	back = NULL;
	518	for (i = 0; backends[i].backend != NULL; i++)
	519	if (backends[i].protocol == cfg.protocol) {
	520	back = backends[i].backend;
	521	break;
	522	}
	523	if (back == NULL) {
	524	fprintf(stderr,
	525	"Internal fault: Unsupported protocol found\n");
	526	return 1;
	527	}
	528	}
	529
	530	/*
	531	* Select port.
	532	*/
	533	if (portnumber != -1)
	534	cfg.port = portnumber;
	535
5673d44e	536	/*
	537	* Set up the pipe we'll use to tell us about SIGWINCH.
	538	*/
	539	if (pipe(signalpipe) < 0) {
	540	perror("pipe");
	541	exit(1);
	542	}
	543	putty_signal(SIGWINCH, sigwinch);
	544
c5e438ec	545	sk_init();
0ff9ea38	546	uxsel_init();
c5e438ec	547
	548	/*
	549	* Start up the connection.
	550	*/
c229ef97	551	logctx = log_init(NULL, &cfg);
b51259f6	552	console_provide_logctx(logctx);
c5e438ec	553	{
cbe2d68f	554	const char *error;
c5e438ec	555	char *realhost;
	556	/* nodelay is only useful if stdin is a terminal device */
	557	int nodelay = cfg.tcp_nodelay && isatty(0);
	558
86916870	559	error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port,
79bf227b	560	&realhost, nodelay, cfg.tcp_keepalives);
c5e438ec	561	if (error) {
984992ef	562	fprintf(stderr, "Unable to open connection:\n%s\n", error);
c5e438ec	563	return 1;
c5e438ec	564	}
c5e438ec	565	back->provide_logctx(backhandle, logctx);
fe5634f6	566	ldisc = ldisc_create(&cfg, NULL, back, backhandle, NULL);
c5e438ec	567	sfree(realhost);
	568	}
	569	connopen = 1;
	570
	571	/*
	572	* Set up the initial console mode. We don't care if this call
	573	* fails, because we know we aren't necessarily running in a
	574	* console.
	575	*/
	576	tcgetattr(0, &orig_termios);
	577	atexit(cleanup_termios);
	578	ldisc_update(NULL, 1, 1);
	579	sending = FALSE;
	580
	581	while (1) {
	582	fd_set rset, wset, xset;
	583	int maxfd;
	584	int rwx;
	585	int ret;
	586
	587	FD_ZERO(&rset);
	588	FD_ZERO(&wset);
	589	FD_ZERO(&xset);
	590	maxfd = 0;
	591
5673d44e	592	FD_SET_MAX(signalpipe[0], maxfd, rset);
5673d44e	593
c5e438ec	594	if (connopen && !sending &&
	595	back->socket(backhandle) != NULL &&
	596	back->sendok(backhandle) &&
	597	back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
	598	/* If we're OK to send, then try to read from stdin. */
	599	FD_SET_MAX(0, maxfd, rset);
	600	}
	601
	602	if (bufchain_size(&stdout_data) > 0) {
	603	/* If we have data for stdout, try to write to stdout. */
	604	FD_SET_MAX(1, maxfd, wset);
	605	}
	606
	607	if (bufchain_size(&stderr_data) > 0) {
	608	/* If we have data for stderr, try to write to stderr. */
	609	FD_SET_MAX(2, maxfd, wset);
	610	}
	611
0ff9ea38	612	/* Count the currently active fds. */
c5e438ec	613	i = 0;
0ff9ea38	614	for (fd = first_fd(&fdstate, &rwx); fd >= 0;
0ff9ea38	615	fd = next_fd(&fdstate, &rwx)) i++;
c5e438ec	616
0ff9ea38	617	/* Expand the fdlist buffer if necessary. */
	618	if (i > fdsize) {
	619	fdsize = i + 16;
	620	fdlist = sresize(fdlist, fdsize, int);
c5e438ec	621	}
	622
	623	/*
0ff9ea38	624	* Add all currently open fds to the select sets, and store
0ff9ea38	625	* them in fdlist as well.
c5e438ec	626	*/
0ff9ea38	627	fdcount = 0;
	628	for (fd = first_fd(&fdstate, &rwx); fd >= 0;
	629	fd = next_fd(&fdstate, &rwx)) {
	630	fdlist[fdcount++] = fd;
c5e438ec	631	if (rwx & 1)
0ff9ea38	632	FD_SET_MAX(fd, maxfd, rset);
c5e438ec	633	if (rwx & 2)
0ff9ea38	634	FD_SET_MAX(fd, maxfd, wset);
c5e438ec	635	if (rwx & 4)
0ff9ea38	636	FD_SET_MAX(fd, maxfd, xset);
c5e438ec	637	}
c5e438ec	638
5673d44e	639	do {
	640	ret = select(maxfd, &rset, &wset, &xset, NULL);
	641	} while (ret < 0 && errno == EINTR);
c5e438ec	642
	643	if (ret < 0) {
	644	perror("select");
	645	exit(1);
	646	}
	647
0ff9ea38	648	for (i = 0; i < fdcount; i++) {
0ff9ea38	649	fd = fdlist[i];
56e5b2db	650	/*
	651	* We must process exceptional notifications before
	652	* ordinary readability ones, or we may go straight
	653	* past the urgent marker.
	654	*/
0ff9ea38	655	if (FD_ISSET(fd, &xset))
	656	select_result(fd, 4);
	657	if (FD_ISSET(fd, &rset))
	658	select_result(fd, 1);
	659	if (FD_ISSET(fd, &wset))
	660	select_result(fd, 2);
c5e438ec	661	}
c5e438ec	662
5673d44e	663	if (FD_ISSET(signalpipe[0], &rset)) {
	664	char c[1];
	665	struct winsize size;
	666	read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */
	667	if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
	668	back->size(backhandle, size.ws_col, size.ws_row);
	669	}
	670
c5e438ec	671	if (FD_ISSET(0, &rset)) {
	672	char buf[4096];
	673	int ret;
	674
	675	if (connopen && back->socket(backhandle) != NULL) {
	676	ret = read(0, buf, sizeof(buf));
	677	if (ret < 0) {
	678	perror("stdin: read");
	679	exit(1);
	680	} else if (ret == 0) {
	681	back->special(backhandle, TS_EOF);
	682	sending = FALSE; /* send nothing further after this */
	683	} else {
	684	back->send(backhandle, buf, ret);
	685	}
	686	}
	687	}
	688
	689	if (FD_ISSET(1, &wset)) {
	690	try_output(0);
	691	}
	692
	693	if (FD_ISSET(2, &wset)) {
	694	try_output(1);
	695	}
	696
	697	if ((!connopen \|\| back->socket(backhandle) == NULL) &&
	698	bufchain_size(&stdout_data) == 0 &&
	699	bufchain_size(&stderr_data) == 0)
	700	break; /* we closed the connection */
	701	}
	702	exitcode = back->exitcode(backhandle);
	703	if (exitcode < 0) {
	704	fprintf(stderr, "Remote process exit code unavailable\n");
	705	exitcode = 1; /* this is an error condition */
	706	}
d9c40fd6	707	cleanup_exit(exitcode);
d9c40fd6	708	return exitcode; /* shouldn't happen, but placates gcc */
c5e438ec	709	}