[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>

/* More helpful version of the FD_SET macro, to also handle maxfd. */
#define FD_SET_MAX(fd, max, set) do { \
    FD_SET(fd, &set); \
    if (max < fd + 1) max = fd + 1; \
} while (0)

#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, 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);
}

/*
 * 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("  -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 *sklist;
    int socket;
    int i, skcount, sksize, socketstate;
    int connopen;
    int exitcode;
    int errors;
    void *ldisc;

    ssh_get_line = console_get_line;

    sklist = NULL;
    skcount = sksize = 0;
    /*
     * Initialise port and protocol to sensible defaults. (These
     * will be overridden by more or less anything.)
     */
    default_protocol = PROT_SSH;
    default_port = 22;

    flags = FLAG_STDERR;
    /*
     * Process the command line.
     */
    do_defaults(NULL, &cfg);
    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 = srealloc(command, cmdsize);
			}
			command[cmdlen++]=*p++;
		    }
		    if (cmdlen >= cmdsize) {
			cmdsize = cmdlen + 512;
			command = srealloc(command, cmdsize);
		    }
		    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();

    /*
     * Start up the connection.
     */
    logctx = log_init(NULL, &cfg);
    {
	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 sockets. */
	i = 0;
	for (socket = first_socket(&socketstate, &rwx); socket >= 0;
	     socket = next_socket(&socketstate, &rwx)) i++;

	/* Expand the sklist buffer if necessary. */
	if (i > sksize) {
	    sksize = i + 16;
	    sklist = srealloc(sklist, sksize * sizeof(*sklist));
	}

	/*
	 * Add all currently open sockets to the select sets, and
	 * store them in sklist as well.
	 */
	skcount = 0;
	for (socket = first_socket(&socketstate, &rwx); socket >= 0;
	     socket = next_socket(&socketstate, &rwx)) {
	    sklist[skcount++] = socket;
	    if (rwx & 1)
		FD_SET_MAX(socket, maxfd, rset);
	    if (rwx & 2)
		FD_SET_MAX(socket, maxfd, wset);
	    if (rwx & 4)
		FD_SET_MAX(socket, 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 < skcount; i++) {
	    socket = sklist[i];
            /*
             * We must process exceptional notifications before
             * ordinary readability ones, or we may go straight
             * past the urgent marker.
             */
	    if (FD_ISSET(socket, &xset))
		select_result(socket, 4);
	    if (FD_ISSET(socket, &rset))
		select_result(socket, 1);
	    if (FD_ISSET(socket, &wset))
		select_result(socket, 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
	17	/* More helpful version of the FD_SET macro, to also handle maxfd. */
	18	#define FD_SET_MAX(fd, max, set) do { \
	19	FD_SET(fd, &set); \
	20	if (max < fd + 1) max = fd + 1; \
	21	} while (0)
	22
	23	#define PUTTY_DO_GLOBALS /* actually _define_ globals */
	24	#include "putty.h"
	25	#include "storage.h"
	26	#include "tree234.h"
	27
	28	#define MAX_STDIN_BACKLOG 4096
	29
	30	void fatalbox(char *p, ...)
	31	{
	32	va_list ap;
	33	fprintf(stderr, "FATAL ERROR: ");
	34	va_start(ap, p);
	35	vfprintf(stderr, p, ap);
	36	va_end(ap);
	37	fputc('\n', stderr);
	38	cleanup_exit(1);
	39	}
	40	void modalfatalbox(char *p, ...)
	41	{
	42	va_list ap;
	43	fprintf(stderr, "FATAL ERROR: ");
	44	va_start(ap, p);
	45	vfprintf(stderr, p, ap);
	46	va_end(ap);
	47	fputc('\n', stderr);
	48	cleanup_exit(1);
	49	}
	50	void connection_fatal(void frontend, char p, ...)
	51	{
	52	va_list ap;
	53	fprintf(stderr, "FATAL ERROR: ");
	54	va_start(ap, p);
	55	vfprintf(stderr, p, ap);
	56	va_end(ap);
	57	fputc('\n', stderr);
	58	cleanup_exit(1);
	59	}
	60	void cmdline_error(char *p, ...)
	61	{
	62	va_list ap;
	63	fprintf(stderr, "plink: ");
	64	va_start(ap, p);
	65	vfprintf(stderr, p, ap);
	66	va_end(ap);
	67	fputc('\n', stderr);
	68	exit(1);
	69	}
	70
	71	struct termios orig_termios;
	72
	73	static Backend *back;
	74	static void *backhandle;
3ea863a3	75	static Config cfg;
c5e438ec	76
5a9eb105	77	/*
	78	* Default settings that are specific to pterm.
	79	*/
c85623f9	80	char platform_default_s(const char name)
5a9eb105	81	{
	82	if (!strcmp(name, "X11Display"))
	83	return getenv("DISPLAY");
	84	if (!strcmp(name, "TermType"))
	85	return getenv("TERM");
	86	if (!strcmp(name, "UserName")) {
	87	/*
	88	* Remote login username will default to the local username.
	89	*/
	90	struct passwd *p;
	91	uid_t uid = getuid();
	92	char user, ret = NULL;
	93
	94	/*
	95	* First, find who we think we are using getlogin. If this
	96	* agrees with our uid, we'll go along with it. This should
	97	* allow sharing of uids between several login names whilst
	98	* coping correctly with people who have su'ed.
	99	*/
	100	user = getlogin();
	101	setpwent();
	102	if (user)
	103	p = getpwnam(user);
	104	else
	105	p = NULL;
	106	if (p && p->pw_uid == uid) {
	107	/*
	108	* The result of getlogin() really does correspond to
	109	* our uid. Fine.
	110	*/
	111	ret = user;
	112	} else {
	113	/*
	114	* If that didn't work, for whatever reason, we'll do
	115	* the simpler version: look up our uid in the password
	116	* file and map it straight to a name.
	117	*/
	118	p = getpwuid(uid);
	119	ret = p->pw_name;
	120	}
	121	endpwent();
	122
	123	return ret;
	124	}
	125	return NULL;
	126	}
	127
c85623f9	128	int platform_default_i(const char *name, int def)
5a9eb105	129	{
	130	if (!strcmp(name, "TermWidth") \|\|
	131	!strcmp(name, "TermHeight")) {
	132	struct winsize size;
	133	if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
	134	return (!strcmp(name, "TermWidth") ? size.ws_col : size.ws_row);
	135	}
	136	return def;
	137	}
	138
9a30e26b	139	FontSpec platform_default_fontspec(const char *name)
	140	{
	141	FontSpec ret;
	142	*ret.name = '\0';
	143	return ret;
	144	}
	145
	146	Filename platform_default_filename(const char *name)
	147	{
	148	Filename ret;
	149	if (!strcmp(name, "LogFileName"))
	150	strcpy(ret.path, "putty.log");
	151	else
	152	*ret.path = '\0';
	153	return ret;
	154	}
	155
c85623f9	156	char x_get_default(const char key)
c5e438ec	157	{
	158	return NULL; /* this is a stub */
	159	}
	160	int term_ldisc(Terminal *term, int mode)
	161	{
	162	return FALSE;
	163	}
	164	void ldisc_update(void *frontend, int echo, int edit)
	165	{
	166	/* Update stdin read mode to reflect changes in line discipline. */
	167	struct termios mode;
	168
	169	mode = orig_termios;
	170
	171	if (echo)
	172	mode.c_lflag \|= ECHO;
	173	else
	174	mode.c_lflag &= ~ECHO;
	175
	176	if (edit)
	177	mode.c_lflag \|= ISIG \| ICANON;
	178	else
	179	mode.c_lflag &= ~(ISIG \| ICANON);
	180
	181	tcsetattr(0, TCSANOW, &mode);
	182	}
	183
	184	void cleanup_termios(void)
	185	{
	186	tcsetattr(0, TCSANOW, &orig_termios);
	187	}
	188
	189	bufchain stdout_data, stderr_data;
	190
	191	void try_output(int is_stderr)
	192	{
	193	bufchain *chain = (is_stderr ? &stderr_data : &stdout_data);
	194	int fd = (is_stderr ? 2 : 1);
	195	void *senddata;
	196	int sendlen, ret;
	197
d69a46c0	198	if (bufchain_size(chain) == 0)
	199	return;
	200
c5e438ec	201	bufchain_prefix(chain, &senddata, &sendlen);
	202	ret = write(fd, senddata, sendlen);
	203	if (ret > 0)
	204	bufchain_consume(chain, ret);
	205	else if (ret < 0) {
	206	perror(is_stderr ? "stderr: write" : "stdout: write");
	207	exit(1);
	208	}
	209	}
	210
	211	int from_backend(void frontend_handle, int is_stderr, char data, int len)
	212	{
	213	int osize, esize;
	214
	215	assert(len > 0);
	216
	217	if (is_stderr) {
	218	bufchain_add(&stderr_data, data, len);
	219	try_output(1);
	220	} else {
	221	bufchain_add(&stdout_data, data, len);
	222	try_output(0);
	223	}
	224
	225	osize = bufchain_size(&stdout_data);
	226	esize = bufchain_size(&stderr_data);
	227
	228	return osize + esize;
	229	}
	230
5673d44e	231	int signalpipe[2];
	232
	233	void sigwinch(int signum)
	234	{
	235	write(signalpipe[1], "x", 1);
	236	}
	237
c5e438ec	238	/*
	239	* Short description of parameters.
	240	*/
	241	static void usage(void)
	242	{
	243	printf("PuTTY Link: command-line connection utility\n");
	244	printf("%s\n", ver);
	245	printf("Usage: plink [options] [user@]host [command]\n");
	246	printf(" (\"host\" can also be a PuTTY saved session name)\n");
	247	printf("Options:\n");
	248	printf(" -v show verbose messages\n");
	249	printf(" -load sessname Load settings from saved session\n");
	250	printf(" -ssh -telnet -rlogin -raw\n");
	251	printf(" force use of a particular protocol (default SSH)\n");
	252	printf(" -P port connect to specified port\n");
	253	printf(" -l user connect with specified username\n");
	254	printf(" -m file read remote command(s) from file\n");
	255	printf(" -batch disable all interactive prompts\n");
	256	printf("The following options only apply to SSH connections:\n");
	257	printf(" -pw passw login with specified password\n");
	258	printf(" -L listen-port:host:port Forward local port to "
	259	"remote address\n");
	260	printf(" -R listen-port:host:port Forward remote port to"
	261	" local address\n");
	262	printf(" -X -x enable / disable X11 forwarding\n");
	263	printf(" -A -a enable / disable agent forwarding\n");
	264	printf(" -t -T enable / disable pty allocation\n");
	265	printf(" -1 -2 force use of particular protocol version\n");
	266	printf(" -C enable compression\n");
	267	printf(" -i key private key file for authentication\n");
	268	exit(1);
	269	}
	270
	271	int main(int argc, char **argv)
	272	{
	273	int sending;
	274	int portnumber = -1;
	275	int *sklist;
	276	int socket;
	277	int i, skcount, sksize, socketstate;
	278	int connopen;
	279	int exitcode;
86256dc6	280	int errors;
c5e438ec	281	void *ldisc;
	282
	283	ssh_get_line = console_get_line;
	284
	285	sklist = NULL;
	286	skcount = sksize = 0;
	287	/*
	288	* Initialise port and protocol to sensible defaults. (These
	289	* will be overridden by more or less anything.)
	290	*/
	291	default_protocol = PROT_SSH;
	292	default_port = 22;
	293
	294	flags = FLAG_STDERR;
	295	/*
	296	* Process the command line.
	297	*/
	298	do_defaults(NULL, &cfg);
	299	default_protocol = cfg.protocol;
	300	default_port = cfg.port;
86256dc6	301	errors = 0;
c5e438ec	302	{
	303	/*
	304	* Override the default protocol if PLINK_PROTOCOL is set.
	305	*/
	306	char *p = getenv("PLINK_PROTOCOL");
	307	int i;
	308	if (p) {
	309	for (i = 0; backends[i].backend != NULL; i++) {
	310	if (!strcmp(backends[i].name, p)) {
	311	default_protocol = cfg.protocol = backends[i].protocol;
	312	default_port = cfg.port =
	313	backends[i].backend->default_port;
	314	break;
	315	}
	316	}
	317	}
	318	}
	319	while (--argc) {
	320	char p = ++argv;
	321	if (*p == '-') {
9b41d3a8	322	int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
9b41d3a8	323	1, &cfg);
c5e438ec	324	if (ret == -2) {
	325	fprintf(stderr,
	326	"plink: option \"%s\" requires an argument\n", p);
86256dc6	327	errors = 1;
c5e438ec	328	} else if (ret == 2) {
	329	--argc, ++argv;
	330	} else if (ret == 1) {
	331	continue;
	332	} else if (!strcmp(p, "-batch")) {
	333	console_batch_mode = 1;
a0e5ed33	334	} else if (!strcmp(p, "-o")) {
86256dc6	335	if (argc <= 1) {
a0e5ed33	336	fprintf(stderr,
a0e5ed33	337	"plink: option \"-o\" requires an argument\n");
86256dc6	338	errors = 1;
	339	} else {
	340	--argc;
	341	provide_xrm_string(*++argv);
	342	}
	343	} else {
	344	fprintf(stderr, "plink: unknown option \"%s\"\n", p);
	345	errors = 1;
c5e438ec	346	}
	347	} else if (*p) {
	348	if (!*cfg.host) {
	349	char *q = p;
a0e5ed33	350
	351	do_defaults(NULL, &cfg);
	352
c5e438ec	353	/*
	354	* If the hostname starts with "telnet:", set the
	355	* protocol to Telnet and process the string as a
	356	* Telnet URL.
	357	*/
	358	if (!strncmp(q, "telnet:", 7)) {
	359	char c;
	360
	361	q += 7;
	362	if (q[0] == '/' && q[1] == '/')
	363	q += 2;
	364	cfg.protocol = PROT_TELNET;
	365	p = q;
	366	while (p && p != ':' && *p != '/')
	367	p++;
	368	c = *p;
	369	if (*p)
	370	*p++ = '\0';
	371	if (c == ':')
	372	cfg.port = atoi(p);
	373	else
	374	cfg.port = -1;
	375	strncpy(cfg.host, q, sizeof(cfg.host) - 1);
	376	cfg.host[sizeof(cfg.host) - 1] = '\0';
	377	} else {
	378	char *r;
	379	/*
	380	* Before we process the [user@]host string, we
	381	* first check for the presence of a protocol
	382	* prefix (a protocol name followed by ",").
	383	*/
	384	r = strchr(p, ',');
	385	if (r) {
	386	int i, j;
	387	for (i = 0; backends[i].backend != NULL; i++) {
	388	j = strlen(backends[i].name);
	389	if (j == r - p &&
	390	!memcmp(backends[i].name, p, j)) {
	391	default_protocol = cfg.protocol =
	392	backends[i].protocol;
	393	portnumber =
	394	backends[i].backend->default_port;
	395	p = r + 1;
	396	break;
	397	}
	398	}
	399	}
	400
	401	/*
	402	* Three cases. Either (a) there's a nonzero
	403	* length string followed by an @, in which
	404	* case that's user and the remainder is host.
	405	* Or (b) there's only one string, not counting
	406	* a potential initial @, and it exists in the
	407	* saved-sessions database. Or (c) only one
	408	* string and it _doesn't_ exist in the
	409	* database.
	410	*/
	411	r = strrchr(p, '@');
	412	if (r == p)
	413	p++, r = NULL; /* discount initial @ */
	414	if (r == NULL) {
	415	/*
	416	* One string.
417	*/
418	Config cfg2;
419	do_defaults(p, &cfg2);
420	if (cfg2.host[0] == '\0') {
421	/* No settings for this host; use defaults */
422	strncpy(cfg.host, p, sizeof(cfg.host) - 1);
423	cfg.host[sizeof(cfg.host) - 1] = '\0';
424	cfg.port = default_port;
425	} else {
426	cfg = cfg2;
427	cfg.remote_cmd_ptr = cfg.remote_cmd;
428	}
429	} else {
430	*r++ = '\0';
431	strncpy(cfg.username, p, sizeof(cfg.username) - 1);
432	cfg.username[sizeof(cfg.username) - 1] = '\0';
433	strncpy(cfg.host, r, sizeof(cfg.host) - 1);
434	cfg.host[sizeof(cfg.host) - 1] = '\0';
435	cfg.port = default_port;
436	}
437	}
438	} else {
439	char *command;
440	int cmdlen, cmdsize;
441	cmdlen = cmdsize = 0;
442	command = NULL;
443
444	while (argc) {
445	while (*p) {
446	if (cmdlen >= cmdsize) {
447	cmdsize = cmdlen + 512;
448	command = srealloc(command, cmdsize);
449	}
450	command[cmdlen++]=*p++;
451	}
452	if (cmdlen >= cmdsize) {
453	cmdsize = cmdlen + 512;
454	command = srealloc(command, cmdsize);
455	}
456	command[cmdlen++]=' '; /* always add trailing space */
457	if (--argc) p = *++argv;
458	}
459	if (cmdlen) command[--cmdlen]='\0';
460	/* change trailing blank to NUL */
461	cfg.remote_cmd_ptr = command;
462	cfg.remote_cmd_ptr2 = NULL;
463	cfg.nopty = TRUE; /* command => no terminal */
464
465	break; /* done with cmdline */
466	}
467	}
468	}
469
86256dc6	470	if (errors)
	471	return 1;
	472
c5e438ec	473	if (!*cfg.host) {
	474	usage();
	475	}
	476
	477	/*
	478	* Trim leading whitespace off the hostname if it's there.
	479	*/
	480	{
	481	int space = strspn(cfg.host, " \t");
	482	memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space);
	483	}
	484
	485	/* See if host is of the form user@host */
	486	if (cfg.host[0] != '\0') {
	487	char *atsign = strchr(cfg.host, '@');
	488	/* Make sure we're not overflowing the user field */
	489	if (atsign) {
	490	if (atsign - cfg.host < sizeof cfg.username) {
	491	strncpy(cfg.username, cfg.host, atsign - cfg.host);
	492	cfg.username[atsign - cfg.host] = '\0';
	493	}
	494	memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1));
	495	}
	496	}
	497
	498	/*
	499	* Perform command-line overrides on session configuration.
	500	*/
9b41d3a8	501	cmdline_run_saved(&cfg);
c5e438ec	502
	503	/*
	504	* Trim a colon suffix off the hostname if it's there.
	505	*/
	506	cfg.host[strcspn(cfg.host, ":")] = '\0';
	507
	508	/*
	509	* Remove any remaining whitespace from the hostname.
	510	*/
	511	{
	512	int p1 = 0, p2 = 0;
	513	while (cfg.host[p2] != '\0') {
	514	if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') {
	515	cfg.host[p1] = cfg.host[p2];
	516	p1++;
	517	}
	518	p2++;
	519	}
	520	cfg.host[p1] = '\0';
	521	}
	522
	523	if (!*cfg.remote_cmd_ptr)
	524	flags \|= FLAG_INTERACTIVE;
	525
	526	/*
	527	* Select protocol. This is farmed out into a table in a
	528	* separate file to enable an ssh-free variant.
	529	*/
	530	{
	531	int i;
	532	back = NULL;
	533	for (i = 0; backends[i].backend != NULL; i++)
	534	if (backends[i].protocol == cfg.protocol) {
	535	back = backends[i].backend;
	536	break;
	537	}
	538	if (back == NULL) {
	539	fprintf(stderr,
	540	"Internal fault: Unsupported protocol found\n");
	541	return 1;
	542	}
	543	}
	544
	545	/*
	546	* Select port.
	547	*/
	548	if (portnumber != -1)
	549	cfg.port = portnumber;
	550
5673d44e	551	/*
	552	* Set up the pipe we'll use to tell us about SIGWINCH.
	553	*/
	554	if (pipe(signalpipe) < 0) {
	555	perror("pipe");
	556	exit(1);
	557	}
	558	putty_signal(SIGWINCH, sigwinch);
	559
c5e438ec	560	sk_init();
	561
	562	/*
	563	* Start up the connection.
	564	*/
c229ef97	565	logctx = log_init(NULL, &cfg);
c5e438ec	566	{
	567	char *error;
	568	char *realhost;
	569	/* nodelay is only useful if stdin is a terminal device */
	570	int nodelay = cfg.tcp_nodelay && isatty(0);
	571
86916870	572	error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port,
c5e438ec	573	&realhost, nodelay);
c5e438ec	574	if (error) {
984992ef	575	fprintf(stderr, "Unable to open connection:\n%s\n", error);
c5e438ec	576	return 1;
c5e438ec	577	}
c5e438ec	578	back->provide_logctx(backhandle, logctx);
fe5634f6	579	ldisc = ldisc_create(&cfg, NULL, back, backhandle, NULL);
c5e438ec	580	sfree(realhost);
	581	}
	582	connopen = 1;
	583
	584	/*
	585	* Set up the initial console mode. We don't care if this call
	586	* fails, because we know we aren't necessarily running in a
	587	* console.
	588	*/
	589	tcgetattr(0, &orig_termios);
	590	atexit(cleanup_termios);
	591	ldisc_update(NULL, 1, 1);
	592	sending = FALSE;
	593
	594	while (1) {
	595	fd_set rset, wset, xset;
	596	int maxfd;
	597	int rwx;
	598	int ret;
	599
	600	FD_ZERO(&rset);
	601	FD_ZERO(&wset);
	602	FD_ZERO(&xset);
	603	maxfd = 0;
	604
5673d44e	605	FD_SET_MAX(signalpipe[0], maxfd, rset);
5673d44e	606
c5e438ec	607	if (connopen && !sending &&
	608	back->socket(backhandle) != NULL &&
	609	back->sendok(backhandle) &&
	610	back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
	611	/* If we're OK to send, then try to read from stdin. */
	612	FD_SET_MAX(0, maxfd, rset);
	613	}
	614
	615	if (bufchain_size(&stdout_data) > 0) {
	616	/* If we have data for stdout, try to write to stdout. */
	617	FD_SET_MAX(1, maxfd, wset);
	618	}
	619
	620	if (bufchain_size(&stderr_data) > 0) {
	621	/* If we have data for stderr, try to write to stderr. */
	622	FD_SET_MAX(2, maxfd, wset);
	623	}
	624
	625	/* Count the currently active sockets. */
	626	i = 0;
	627	for (socket = first_socket(&socketstate, &rwx); socket >= 0;
	628	socket = next_socket(&socketstate, &rwx)) i++;
	629
	630	/* Expand the sklist buffer if necessary. */
	631	if (i > sksize) {
	632	sksize = i + 16;
	633	sklist = srealloc(sklist, sksize * sizeof(*sklist));
	634	}
	635
	636	/*
	637	* Add all currently open sockets to the select sets, and
	638	* store them in sklist as well.
	639	*/
	640	skcount = 0;
	641	for (socket = first_socket(&socketstate, &rwx); socket >= 0;
	642	socket = next_socket(&socketstate, &rwx)) {
	643	sklist[skcount++] = socket;
	644	if (rwx & 1)
	645	FD_SET_MAX(socket, maxfd, rset);
	646	if (rwx & 2)
	647	FD_SET_MAX(socket, maxfd, wset);
	648	if (rwx & 4)
	649	FD_SET_MAX(socket, maxfd, xset);
	650	}
	651
5673d44e	652	do {
	653	ret = select(maxfd, &rset, &wset, &xset, NULL);
	654	} while (ret < 0 && errno == EINTR);
c5e438ec	655
	656	if (ret < 0) {
	657	perror("select");
	658	exit(1);
	659	}
	660
	661	for (i = 0; i < skcount; i++) {
	662	socket = sklist[i];
56e5b2db	663	/*
	664	* We must process exceptional notifications before
	665	* ordinary readability ones, or we may go straight
	666	* past the urgent marker.
	667	*/
	668	if (FD_ISSET(socket, &xset))
	669	select_result(socket, 4);
c5e438ec	670	if (FD_ISSET(socket, &rset))
	671	select_result(socket, 1);
	672	if (FD_ISSET(socket, &wset))
	673	select_result(socket, 2);
c5e438ec	674	}
c5e438ec	675
5673d44e	676	if (FD_ISSET(signalpipe[0], &rset)) {
	677	char c[1];
	678	struct winsize size;
	679	read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */
	680	if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
	681	back->size(backhandle, size.ws_col, size.ws_row);
	682	}
	683
c5e438ec	684	if (FD_ISSET(0, &rset)) {
	685	char buf[4096];
	686	int ret;
	687
	688	if (connopen && back->socket(backhandle) != NULL) {
	689	ret = read(0, buf, sizeof(buf));
	690	if (ret < 0) {
	691	perror("stdin: read");
	692	exit(1);
	693	} else if (ret == 0) {
	694	back->special(backhandle, TS_EOF);
	695	sending = FALSE; /* send nothing further after this */
	696	} else {
	697	back->send(backhandle, buf, ret);
	698	}
	699	}
	700	}
	701
	702	if (FD_ISSET(1, &wset)) {
	703	try_output(0);
	704	}
	705
	706	if (FD_ISSET(2, &wset)) {
	707	try_output(1);
	708	}
	709
	710	if ((!connopen \|\| back->socket(backhandle) == NULL) &&
	711	bufchain_size(&stdout_data) == 0 &&
	712	bufchain_size(&stderr_data) == 0)
	713	break; /* we closed the connection */
	714	}
	715	exitcode = back->exitcode(backhandle);
	716	if (exitcode < 0) {
	717	fprintf(stderr, "Remote process exit code unavailable\n");
	718	exitcode = 1; /* this is an error condition */
	719	}
d9c40fd6	720	cleanup_exit(exitcode);
d9c40fd6	721	return exitcode; /* shouldn't happen, but placates gcc */
c5e438ec	722	}