[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 getenv("DISPLAY");
    if (!strcmp(name, "TermType"))
	return getenv("TERM");
    if (!strcmp(name, "UserName")) {
	/*
	 * Remote login username will default to the local username.
	 */
	struct passwd *p;
	uid_t uid = getuid();
	char *user, *ret = NULL;

	/*
	 * First, find who we think we are using getlogin. If this
	 * agrees with our uid, we'll go along with it. This should
	 * allow sharing of uids between several login names whilst
	 * coping correctly with people who have su'ed.
	 */
	user = getlogin();
	setpwent();
	if (user)
	    p = getpwnam(user);
	else
	    p = NULL;
	if (p && p->pw_uid == uid) {
	    /*
	     * The result of getlogin() really does correspond to
	     * our uid. Fine.
	     */
	    ret = user;
	} else {
	    /*
	     * If that didn't work, for whatever reason, we'll do
	     * the simpler version: look up our uid in the password
	     * file and map it straight to a name.
	     */
	    p = getpwuid(uid);
	    ret = p->pw_name;
	}
	endpwent();

	return ret;
    }
    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");
    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;
    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, "-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);

    /*
     * 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	{
	76	if (!strcmp(name, "X11Display"))
	77	return getenv("DISPLAY");
	78	if (!strcmp(name, "TermType"))
	79	return getenv("TERM");
	80	if (!strcmp(name, "UserName")) {
	81	/*
	82	* Remote login username will default to the local username.
	83	*/
	84	struct passwd *p;
	85	uid_t uid = getuid();
	86	char user, ret = NULL;
	87
	88	/*
	89	* First, find who we think we are using getlogin. If this
	90	* agrees with our uid, we'll go along with it. This should
	91	* allow sharing of uids between several login names whilst
	92	* coping correctly with people who have su'ed.
	93	*/
	94	user = getlogin();
	95	setpwent();
	96	if (user)
	97	p = getpwnam(user);
	98	else
	99	p = NULL;
	100	if (p && p->pw_uid == uid) {
	101	/*
	102	* The result of getlogin() really does correspond to
	103	* our uid. Fine.
	104	*/
	105	ret = user;
	106	} else {
	107	/*
	108	* If that didn't work, for whatever reason, we'll do
	109	* the simpler version: look up our uid in the password
	110	* file and map it straight to a name.
	111	*/
	112	p = getpwuid(uid);
	113	ret = p->pw_name;
	114	}
	115	endpwent();
	116
	117	return ret;
	118	}
	119	return NULL;
	120	}
	121
c85623f9	122	int platform_default_i(const char *name, int def)
5a9eb105	123	{
	124	if (!strcmp(name, "TermWidth") \|\|
	125	!strcmp(name, "TermHeight")) {
	126	struct winsize size;
	127	if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
	128	return (!strcmp(name, "TermWidth") ? size.ws_col : size.ws_row);
	129	}
	130	return def;
	131	}
	132
9a30e26b	133	FontSpec platform_default_fontspec(const char *name)
	134	{
	135	FontSpec ret;
	136	*ret.name = '\0';
	137	return ret;
	138	}
	139
	140	Filename platform_default_filename(const char *name)
	141	{
	142	Filename ret;
	143	if (!strcmp(name, "LogFileName"))
	144	strcpy(ret.path, "putty.log");
	145	else
	146	*ret.path = '\0';
	147	return ret;
	148	}
	149
c85623f9	150	char x_get_default(const char key)
c5e438ec	151	{
	152	return NULL; /* this is a stub */
	153	}
	154	int term_ldisc(Terminal *term, int mode)
	155	{
	156	return FALSE;
	157	}
	158	void ldisc_update(void *frontend, int echo, int edit)
	159	{
	160	/* Update stdin read mode to reflect changes in line discipline. */
	161	struct termios mode;
	162
	163	mode = orig_termios;
	164
	165	if (echo)
	166	mode.c_lflag \|= ECHO;
	167	else
	168	mode.c_lflag &= ~ECHO;
	169
	170	if (edit)
	171	mode.c_lflag \|= ISIG \| ICANON;
	172	else
	173	mode.c_lflag &= ~(ISIG \| ICANON);
	174
	175	tcsetattr(0, TCSANOW, &mode);
	176	}
	177
	178	void cleanup_termios(void)
	179	{
	180	tcsetattr(0, TCSANOW, &orig_termios);
	181	}
	182
	183	bufchain stdout_data, stderr_data;
	184
	185	void try_output(int is_stderr)
	186	{
	187	bufchain *chain = (is_stderr ? &stderr_data : &stdout_data);
	188	int fd = (is_stderr ? 2 : 1);
	189	void *senddata;
	190	int sendlen, ret;
	191
d69a46c0	192	if (bufchain_size(chain) == 0)
	193	return;
	194
c5e438ec	195	bufchain_prefix(chain, &senddata, &sendlen);
	196	ret = write(fd, senddata, sendlen);
	197	if (ret > 0)
	198	bufchain_consume(chain, ret);
	199	else if (ret < 0) {
	200	perror(is_stderr ? "stderr: write" : "stdout: write");
	201	exit(1);
	202	}
	203	}
	204
9fab77dc	205	int from_backend(void *frontend_handle, int is_stderr,
9fab77dc	206	const char *data, int len)
c5e438ec	207	{
	208	int osize, esize;
	209
	210	assert(len > 0);
	211
	212	if (is_stderr) {
	213	bufchain_add(&stderr_data, data, len);
	214	try_output(1);
	215	} else {
	216	bufchain_add(&stdout_data, data, len);
	217	try_output(0);
	218	}
	219
	220	osize = bufchain_size(&stdout_data);
	221	esize = bufchain_size(&stderr_data);
	222
	223	return osize + esize;
	224	}
	225
5673d44e	226	int signalpipe[2];
	227
	228	void sigwinch(int signum)
	229	{
	230	write(signalpipe[1], "x", 1);
	231	}
	232
c5e438ec	233	/*
74aca06d	234	* In Plink our selects are synchronous, so these functions are
	235	* empty stubs.
	236	*/
	237	int uxsel_input_add(int fd, int rwx) { return 0; }
	238	void uxsel_input_remove(int id) { }
	239
	240	/*
c5e438ec	241	* Short description of parameters.
	242	*/
	243	static void usage(void)
	244	{
	245	printf("PuTTY Link: command-line connection utility\n");
	246	printf("%s\n", ver);
	247	printf("Usage: plink [options] [user@]host [command]\n");
	248	printf(" (\"host\" can also be a PuTTY saved session name)\n");
	249	printf("Options:\n");
	250	printf(" -v show verbose messages\n");
	251	printf(" -load sessname Load settings from saved session\n");
	252	printf(" -ssh -telnet -rlogin -raw\n");
	253	printf(" force use of a particular protocol (default SSH)\n");
	254	printf(" -P port connect to specified port\n");
	255	printf(" -l user connect with specified username\n");
	256	printf(" -m file read remote command(s) from file\n");
	257	printf(" -batch disable all interactive prompts\n");
	258	printf("The following options only apply to SSH connections:\n");
	259	printf(" -pw passw login with specified password\n");
820ebe3b	260	printf(" -D listen-port Dynamic SOCKS-based port forwarding\n");
c5e438ec	261	printf(" -L listen-port:host:port Forward local port to "
	262	"remote address\n");
	263	printf(" -R listen-port:host:port Forward remote port to"
	264	" local address\n");
	265	printf(" -X -x enable / disable X11 forwarding\n");
	266	printf(" -A -a enable / disable agent forwarding\n");
	267	printf(" -t -T enable / disable pty allocation\n");
	268	printf(" -1 -2 force use of particular protocol version\n");
	269	printf(" -C enable compression\n");
	270	printf(" -i key private key file for authentication\n");
	271	exit(1);
	272	}
	273
	274	int main(int argc, char **argv)
	275	{
	276	int sending;
	277	int portnumber = -1;
0ff9ea38	278	int *fdlist;
	279	int fd;
	280	int i, fdcount, fdsize, fdstate;
c5e438ec	281	int connopen;
c5e438ec	282	int exitcode;
86256dc6	283	int errors;
b51259f6	284	void ldisc, logctx;
c5e438ec	285
	286	ssh_get_line = console_get_line;
	287
0ff9ea38	288	fdlist = NULL;
0ff9ea38	289	fdcount = fdsize = 0;
c5e438ec	290	/*
	291	* Initialise port and protocol to sensible defaults. (These
	292	* will be overridden by more or less anything.)
	293	*/
	294	default_protocol = PROT_SSH;
	295	default_port = 22;
	296
	297	flags = FLAG_STDERR;
	298	/*
	299	* Process the command line.
	300	*/
	301	do_defaults(NULL, &cfg);
	302	default_protocol = cfg.protocol;
	303	default_port = cfg.port;
86256dc6	304	errors = 0;
c5e438ec	305	{
	306	/*
	307	* Override the default protocol if PLINK_PROTOCOL is set.
	308	*/
	309	char *p = getenv("PLINK_PROTOCOL");
	310	int i;
	311	if (p) {
	312	for (i = 0; backends[i].backend != NULL; i++) {
	313	if (!strcmp(backends[i].name, p)) {
	314	default_protocol = cfg.protocol = backends[i].protocol;
	315	default_port = cfg.port =
	316	backends[i].backend->default_port;
	317	break;
	318	}
	319	}
	320	}
	321	}
	322	while (--argc) {
	323	char p = ++argv;
	324	if (*p == '-') {
9b41d3a8	325	int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
9b41d3a8	326	1, &cfg);
c5e438ec	327	if (ret == -2) {
	328	fprintf(stderr,
	329	"plink: option \"%s\" requires an argument\n", p);
86256dc6	330	errors = 1;
c5e438ec	331	} else if (ret == 2) {
	332	--argc, ++argv;
	333	} else if (ret == 1) {
	334	continue;
	335	} else if (!strcmp(p, "-batch")) {
	336	console_batch_mode = 1;
a0e5ed33	337	} else if (!strcmp(p, "-o")) {
86256dc6	338	if (argc <= 1) {
a0e5ed33	339	fprintf(stderr,
a0e5ed33	340	"plink: option \"-o\" requires an argument\n");
86256dc6	341	errors = 1;
	342	} else {
	343	--argc;
	344	provide_xrm_string(*++argv);
	345	}
	346	} else {
	347	fprintf(stderr, "plink: unknown option \"%s\"\n", p);
	348	errors = 1;
c5e438ec	349	}
	350	} else if (*p) {
	351	if (!*cfg.host) {
	352	char *q = p;
a0e5ed33	353
	354	do_defaults(NULL, &cfg);
	355
c5e438ec	356	/*
	357	* If the hostname starts with "telnet:", set the
	358	* protocol to Telnet and process the string as a
	359	* Telnet URL.
	360	*/
	361	if (!strncmp(q, "telnet:", 7)) {
	362	char c;
	363
	364	q += 7;
	365	if (q[0] == '/' && q[1] == '/')
	366	q += 2;
	367	cfg.protocol = PROT_TELNET;
	368	p = q;
	369	while (p && p != ':' && *p != '/')
	370	p++;
	371	c = *p;
	372	if (*p)
	373	*p++ = '\0';
	374	if (c == ':')
	375	cfg.port = atoi(p);
	376	else
	377	cfg.port = -1;
	378	strncpy(cfg.host, q, sizeof(cfg.host) - 1);
	379	cfg.host[sizeof(cfg.host) - 1] = '\0';
	380	} else {
	381	char *r;
	382	/*
	383	* Before we process the [user@]host string, we
	384	* first check for the presence of a protocol
	385	* prefix (a protocol name followed by ",").
	386	*/
	387	r = strchr(p, ',');
	388	if (r) {
	389	int i, j;
	390	for (i = 0; backends[i].backend != NULL; i++) {
	391	j = strlen(backends[i].name);
	392	if (j == r - p &&
	393	!memcmp(backends[i].name, p, j)) {
	394	default_protocol = cfg.protocol =
	395	backends[i].protocol;
	396	portnumber =
	397	backends[i].backend->default_port;
	398	p = r + 1;
	399	break;
	400	}
	401	}
	402	}
	403
	404	/*
	405	* Three cases. Either (a) there's a nonzero
	406	* length string followed by an @, in which
	407	* case that's user and the remainder is host.
	408	* Or (b) there's only one string, not counting
	409	* a potential initial @, and it exists in the
	410	* saved-sessions database. Or (c) only one
	411	* string and it _doesn't_ exist in the
	412	* database.
	413	*/
	414	r = strrchr(p, '@');
	415	if (r == p)
	416	p++, r = NULL; /* discount initial @ */
	417	if (r == NULL) {
	418	/*
	419	* One string.
420	*/
421	Config cfg2;
422	do_defaults(p, &cfg2);
423	if (cfg2.host[0] == '\0') {
424	/* No settings for this host; use defaults */
425	strncpy(cfg.host, p, sizeof(cfg.host) - 1);
426	cfg.host[sizeof(cfg.host) - 1] = '\0';
427	cfg.port = default_port;
428	} else {
429	cfg = cfg2;
430	cfg.remote_cmd_ptr = cfg.remote_cmd;
431	}
432	} else {
433	*r++ = '\0';
434	strncpy(cfg.username, p, sizeof(cfg.username) - 1);
435	cfg.username[sizeof(cfg.username) - 1] = '\0';
436	strncpy(cfg.host, r, sizeof(cfg.host) - 1);
437	cfg.host[sizeof(cfg.host) - 1] = '\0';
438	cfg.port = default_port;
439	}
440	}
441	} else {
442	char *command;
443	int cmdlen, cmdsize;
444	cmdlen = cmdsize = 0;
445	command = NULL;
446
447	while (argc) {
448	while (*p) {
449	if (cmdlen >= cmdsize) {
450	cmdsize = cmdlen + 512;
3d88e64d	451	command = sresize(command, cmdsize, char);
c5e438ec	452	}
	453	command[cmdlen++]=*p++;
	454	}
	455	if (cmdlen >= cmdsize) {
	456	cmdsize = cmdlen + 512;
3d88e64d	457	command = sresize(command, cmdsize, char);
c5e438ec	458	}
	459	command[cmdlen++]=' '; /* always add trailing space */
	460	if (--argc) p = *++argv;
	461	}
	462	if (cmdlen) command[--cmdlen]='\0';
	463	/* change trailing blank to NUL */
	464	cfg.remote_cmd_ptr = command;
	465	cfg.remote_cmd_ptr2 = NULL;
	466	cfg.nopty = TRUE; /* command => no terminal */
	467
	468	break; /* done with cmdline */
	469	}
	470	}
	471	}
	472
86256dc6	473	if (errors)
	474	return 1;
	475
c5e438ec	476	if (!*cfg.host) {
	477	usage();
	478	}
	479
	480	/*
	481	* Trim leading whitespace off the hostname if it's there.
	482	*/
	483	{
	484	int space = strspn(cfg.host, " \t");
	485	memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space);
	486	}
	487
	488	/* See if host is of the form user@host */
	489	if (cfg.host[0] != '\0') {
	490	char *atsign = strchr(cfg.host, '@');
	491	/* Make sure we're not overflowing the user field */
	492	if (atsign) {
	493	if (atsign - cfg.host < sizeof cfg.username) {
	494	strncpy(cfg.username, cfg.host, atsign - cfg.host);
	495	cfg.username[atsign - cfg.host] = '\0';
	496	}
	497	memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1));
	498	}
	499	}
	500
	501	/*
	502	* Perform command-line overrides on session configuration.
	503	*/
9b41d3a8	504	cmdline_run_saved(&cfg);
c5e438ec	505
	506	/*
	507	* Trim a colon suffix off the hostname if it's there.
	508	*/
	509	cfg.host[strcspn(cfg.host, ":")] = '\0';
	510
	511	/*
	512	* Remove any remaining whitespace from the hostname.
	513	*/
	514	{
	515	int p1 = 0, p2 = 0;
	516	while (cfg.host[p2] != '\0') {
	517	if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') {
	518	cfg.host[p1] = cfg.host[p2];
	519	p1++;
	520	}
	521	p2++;
	522	}
	523	cfg.host[p1] = '\0';
	524	}
	525
	526	if (!*cfg.remote_cmd_ptr)
	527	flags \|= FLAG_INTERACTIVE;
	528
	529	/*
	530	* Select protocol. This is farmed out into a table in a
	531	* separate file to enable an ssh-free variant.
	532	*/
	533	{
	534	int i;
	535	back = NULL;
	536	for (i = 0; backends[i].backend != NULL; i++)
	537	if (backends[i].protocol == cfg.protocol) {
	538	back = backends[i].backend;
	539	break;
	540	}
	541	if (back == NULL) {
	542	fprintf(stderr,
	543	"Internal fault: Unsupported protocol found\n");
	544	return 1;
	545	}
	546	}
	547
	548	/*
	549	* Select port.
	550	*/
	551	if (portnumber != -1)
	552	cfg.port = portnumber;
	553
5673d44e	554	/*
	555	* Set up the pipe we'll use to tell us about SIGWINCH.
	556	*/
	557	if (pipe(signalpipe) < 0) {
	558	perror("pipe");
	559	exit(1);
	560	}
	561	putty_signal(SIGWINCH, sigwinch);
	562
c5e438ec	563	sk_init();
0ff9ea38	564	uxsel_init();
c5e438ec	565
	566	/*
	567	* Start up the connection.
	568	*/
c229ef97	569	logctx = log_init(NULL, &cfg);
b51259f6	570	console_provide_logctx(logctx);
c5e438ec	571	{
cbe2d68f	572	const char *error;
c5e438ec	573	char *realhost;
	574	/* nodelay is only useful if stdin is a terminal device */
	575	int nodelay = cfg.tcp_nodelay && isatty(0);
	576
86916870	577	error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port,
c5e438ec	578	&realhost, nodelay);
c5e438ec	579	if (error) {
984992ef	580	fprintf(stderr, "Unable to open connection:\n%s\n", error);
c5e438ec	581	return 1;
c5e438ec	582	}
c5e438ec	583	back->provide_logctx(backhandle, logctx);
fe5634f6	584	ldisc = ldisc_create(&cfg, NULL, back, backhandle, NULL);
c5e438ec	585	sfree(realhost);
	586	}
	587	connopen = 1;
	588
	589	/*
	590	* Set up the initial console mode. We don't care if this call
	591	* fails, because we know we aren't necessarily running in a
	592	* console.
	593	*/
	594	tcgetattr(0, &orig_termios);
	595	atexit(cleanup_termios);
	596	ldisc_update(NULL, 1, 1);
	597	sending = FALSE;
	598
	599	while (1) {
	600	fd_set rset, wset, xset;
	601	int maxfd;
	602	int rwx;
	603	int ret;
	604
	605	FD_ZERO(&rset);
	606	FD_ZERO(&wset);
	607	FD_ZERO(&xset);
	608	maxfd = 0;
	609
5673d44e	610	FD_SET_MAX(signalpipe[0], maxfd, rset);
5673d44e	611
c5e438ec	612	if (connopen && !sending &&
	613	back->socket(backhandle) != NULL &&
	614	back->sendok(backhandle) &&
	615	back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
	616	/* If we're OK to send, then try to read from stdin. */
	617	FD_SET_MAX(0, maxfd, rset);
	618	}
	619
	620	if (bufchain_size(&stdout_data) > 0) {
	621	/* If we have data for stdout, try to write to stdout. */
	622	FD_SET_MAX(1, maxfd, wset);
	623	}
	624
	625	if (bufchain_size(&stderr_data) > 0) {
	626	/* If we have data for stderr, try to write to stderr. */
	627	FD_SET_MAX(2, maxfd, wset);
	628	}
	629
0ff9ea38	630	/* Count the currently active fds. */
c5e438ec	631	i = 0;
0ff9ea38	632	for (fd = first_fd(&fdstate, &rwx); fd >= 0;
0ff9ea38	633	fd = next_fd(&fdstate, &rwx)) i++;
c5e438ec	634
0ff9ea38	635	/* Expand the fdlist buffer if necessary. */
	636	if (i > fdsize) {
	637	fdsize = i + 16;
	638	fdlist = sresize(fdlist, fdsize, int);
c5e438ec	639	}
	640
	641	/*
0ff9ea38	642	* Add all currently open fds to the select sets, and store
0ff9ea38	643	* them in fdlist as well.
c5e438ec	644	*/
0ff9ea38	645	fdcount = 0;
	646	for (fd = first_fd(&fdstate, &rwx); fd >= 0;
	647	fd = next_fd(&fdstate, &rwx)) {
	648	fdlist[fdcount++] = fd;
c5e438ec	649	if (rwx & 1)
0ff9ea38	650	FD_SET_MAX(fd, maxfd, rset);
c5e438ec	651	if (rwx & 2)
0ff9ea38	652	FD_SET_MAX(fd, maxfd, wset);
c5e438ec	653	if (rwx & 4)
0ff9ea38	654	FD_SET_MAX(fd, maxfd, xset);
c5e438ec	655	}
c5e438ec	656
5673d44e	657	do {
	658	ret = select(maxfd, &rset, &wset, &xset, NULL);
	659	} while (ret < 0 && errno == EINTR);
c5e438ec	660
	661	if (ret < 0) {
	662	perror("select");
	663	exit(1);
	664	}
	665
0ff9ea38	666	for (i = 0; i < fdcount; i++) {
0ff9ea38	667	fd = fdlist[i];
56e5b2db	668	/*
	669	* We must process exceptional notifications before
	670	* ordinary readability ones, or we may go straight
	671	* past the urgent marker.
	672	*/
0ff9ea38	673	if (FD_ISSET(fd, &xset))
	674	select_result(fd, 4);
	675	if (FD_ISSET(fd, &rset))
	676	select_result(fd, 1);
	677	if (FD_ISSET(fd, &wset))
	678	select_result(fd, 2);
c5e438ec	679	}
c5e438ec	680
5673d44e	681	if (FD_ISSET(signalpipe[0], &rset)) {
	682	char c[1];
	683	struct winsize size;
	684	read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */
	685	if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
	686	back->size(backhandle, size.ws_col, size.ws_row);
	687	}
	688
c5e438ec	689	if (FD_ISSET(0, &rset)) {
	690	char buf[4096];
	691	int ret;
	692
	693	if (connopen && back->socket(backhandle) != NULL) {
	694	ret = read(0, buf, sizeof(buf));
	695	if (ret < 0) {
	696	perror("stdin: read");
	697	exit(1);
	698	} else if (ret == 0) {
	699	back->special(backhandle, TS_EOF);
	700	sending = FALSE; /* send nothing further after this */
	701	} else {
	702	back->send(backhandle, buf, ret);
	703	}
	704	}
	705	}
	706
	707	if (FD_ISSET(1, &wset)) {
	708	try_output(0);
	709	}
	710
	711	if (FD_ISSET(2, &wset)) {
	712	try_output(1);
	713	}
	714
	715	if ((!connopen \|\| back->socket(backhandle) == NULL) &&
	716	bufchain_size(&stdout_data) == 0 &&
	717	bufchain_size(&stderr_data) == 0)
	718	break; /* we closed the connection */
	719	}
	720	exitcode = back->exitcode(backhandle);
	721	if (exitcode < 0) {
	722	fprintf(stderr, "Remote process exit code unavailable\n");
	723	exitcode = 1; /* this is an error condition */
	724	}
d9c40fd6	725	cleanup_exit(exitcode);
d9c40fd6	726	return exitcode; /* shouldn't happen, but placates gcc */
c5e438ec	727	}