Merge remote-tracking branch 'origin/released'

Conflicts:
	tools/plink/misc.h
	tools/plink/ssh.c
	tools/plink/sshbn.c
	tools/plink/winplink.c

1 files changed, 431 insertions, 428 deletions

diff --git a/tools/plink/rlogin.c b/tools/plink/rlogin.c
index 29ae5fd14..3c86eee85 100644
--- a/tools/plink/rlogin.c
+++ b/tools/plink/rlogin.c
@@ -1,428 +1,431 @@
-/*

- * Rlogin backend.

- */

-

-#include <stdio.h>

-#include <stdlib.h>

-#include <ctype.h>

-

-#include "putty.h"

-

-#ifndef FALSE

-#define FALSE 0

-#endif

-#ifndef TRUE

-#define TRUE 1

-#endif

-

-#define RLOGIN_MAX_BACKLOG 4096

-

-typedef struct rlogin_tag {

-    const struct plug_function_table *fn;

-    /* the above field _must_ be first in the structure */

-

-    Socket s;

-    int bufsize;

-    int firstbyte;

-    int cansize;

-    int term_width, term_height;

-    void *frontend;

-

-    Conf *conf;

-

-    /* In case we need to read a username from the terminal before starting */

-    prompts_t *prompt;

-} *Rlogin;

-

-static void rlogin_size(void *handle, int width, int height);

-

-static void c_write(Rlogin rlogin, char *buf, int len)

-{

-    int backlog = from_backend(rlogin->frontend, 0, buf, len);

-    sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG);

-}

-

-static void rlogin_log(Plug plug, int type, SockAddr addr, int port,

-		       const char *error_msg, int error_code)

-{

-    Rlogin rlogin = (Rlogin) plug;

-    char addrbuf[256], *msg;

-

-    sk_getaddr(addr, addrbuf, lenof(addrbuf));

-

-    if (type == 0)

-	msg = dupprintf("Connecting to %s port %d", addrbuf, port);

-    else

-	msg = dupprintf("Failed to connect to %s: %s", addrbuf, error_msg);

-

-    logevent(rlogin->frontend, msg);

-}

-

-static int rlogin_closing(Plug plug, const char *error_msg, int error_code,

-			  int calling_back)

-{

-    Rlogin rlogin = (Rlogin) plug;

-

-    /*

-     * We don't implement independent EOF in each direction for Telnet

-     * connections; as soon as we get word that the remote side has

-     * sent us EOF, we wind up the whole connection.

-     */

-

-    if (rlogin->s) {

-        sk_close(rlogin->s);

-        rlogin->s = NULL;

-	notify_remote_exit(rlogin->frontend);

-    }

-    if (error_msg) {

-	/* A socket error has occurred. */

-	logevent(rlogin->frontend, error_msg);

-	connection_fatal(rlogin->frontend, "%s", error_msg);

-    }				       /* Otherwise, the remote side closed the connection normally. */

-    return 0;

-}

-

-static int rlogin_receive(Plug plug, int urgent, char *data, int len)

-{

-    Rlogin rlogin = (Rlogin) plug;

-    if (urgent == 2) {

-	char c;

-

-	c = *data++;

-	len--;

-	if (c == '\x80') {

-	    rlogin->cansize = 1;

-	    rlogin_size(rlogin, rlogin->term_width, rlogin->term_height);

-        }

-	/*

-	 * We should flush everything (aka Telnet SYNCH) if we see

-	 * 0x02, and we should turn off and on _local_ flow control

-	 * on 0x10 and 0x20 respectively. I'm not convinced it's

-	 * worth it...

-	 */

-    } else {

-	/*

-	 * Main rlogin protocol. This is really simple: the first

-	 * byte is expected to be NULL and is ignored, and the rest

-	 * is printed.

-	 */

-	if (rlogin->firstbyte) {

-	    if (data[0] == '\0') {

-		data++;

-		len--;

-	    }

-	    rlogin->firstbyte = 0;

-	}

-	if (len > 0)

-            c_write(rlogin, data, len);

-    }

-    return 1;

-}

-

-static void rlogin_sent(Plug plug, int bufsize)

-{

-    Rlogin rlogin = (Rlogin) plug;

-    rlogin->bufsize = bufsize;

-}

-

-static void rlogin_startup(Rlogin rlogin, const char *ruser)

-{

-    char z = 0;

-    char *p;

-

-    sk_write(rlogin->s, &z, 1);

-    p = conf_get_str(rlogin->conf, CONF_localusername);

-    sk_write(rlogin->s, p, strlen(p));

-    sk_write(rlogin->s, &z, 1);

-    sk_write(rlogin->s, ruser, strlen(ruser));

-    sk_write(rlogin->s, &z, 1);

-    p = conf_get_str(rlogin->conf, CONF_termtype);

-    sk_write(rlogin->s, p, strlen(p));

-    sk_write(rlogin->s, "/", 1);

-    p = conf_get_str(rlogin->conf, CONF_termspeed);

-    sk_write(rlogin->s, p, strspn(p, "0123456789"));

-    rlogin->bufsize = sk_write(rlogin->s, &z, 1);

-

-    rlogin->prompt = NULL;

-}

-

-/*

- * Called to set up the rlogin connection.

- * 

- * Returns an error message, or NULL on success.

- *

- * Also places the canonical host name into `realhost'. It must be

- * freed by the caller.

- */

-static const char *rlogin_init(void *frontend_handle, void **backend_handle,

-			       Conf *conf,

-			       char *host, int port, char **realhost,

-			       int nodelay, int keepalive)

-{

-    static const struct plug_function_table fn_table = {

-	rlogin_log,

-	rlogin_closing,

-	rlogin_receive,

-	rlogin_sent

-    };

-    SockAddr addr;

-    const char *err;

-    Rlogin rlogin;

-    char *ruser;

-    int addressfamily;

-    char *loghost;

-

-    rlogin = snew(struct rlogin_tag);

-    rlogin->fn = &fn_table;

-    rlogin->s = NULL;

-    rlogin->frontend = frontend_handle;

-    rlogin->term_width = conf_get_int(conf, CONF_width);

-    rlogin->term_height = conf_get_int(conf, CONF_height);

-    rlogin->firstbyte = 1;

-    rlogin->cansize = 0;

-    rlogin->prompt = NULL;

-    rlogin->conf = conf_copy(conf);

-    *backend_handle = rlogin;

-

-    addressfamily = conf_get_int(conf, CONF_addressfamily);

-    /*

-     * Try to find host.

-     */

-    {

-	char *buf;

-	buf = dupprintf("Looking up host \"%s\"%s", host,

-			(addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" :

-			 (addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" :

-			  "")));

-	logevent(rlogin->frontend, buf);

-	sfree(buf);

-    }

-    addr = name_lookup(host, port, realhost, conf, addressfamily);

-    if ((err = sk_addr_error(addr)) != NULL) {

-	sk_addr_free(addr);

-	return err;

-    }

-

-    if (port < 0)

-	port = 513;		       /* default rlogin port */

-

-    /*

-     * Open socket.

-     */

-    rlogin->s = new_connection(addr, *realhost, port, 1, 0,

-			       nodelay, keepalive, (Plug) rlogin, conf);

-    if ((err = sk_socket_error(rlogin->s)) != NULL)

-	return err;

-

-    loghost = conf_get_str(conf, CONF_loghost);

-    if (*loghost) {

-	char *colon;

-

-	sfree(*realhost);

-	*realhost = dupstr(loghost);

-	colon = strrchr(*realhost, ':');

-	if (colon) {

-	    /*

-	     * FIXME: if we ever update this aspect of ssh.c for

-	     * IPv6 literal management, this should change in line

-	     * with it.

-	     */

-	    *colon++ = '\0';

-	}

-    }

-

-    /*

-     * Send local username, remote username, terminal type and

-     * terminal speed - unless we don't have the remote username yet,

-     * in which case we prompt for it and may end up deferring doing

-     * anything else until the local prompt mechanism returns.

-     */

-    if ((ruser = get_remote_username(conf)) == NULL) {

-        rlogin_startup(rlogin, ruser);

-        sfree(ruser);

-    } else {

-        int ret;

-

-        rlogin->prompt = new_prompts(rlogin->frontend);

-        rlogin->prompt->to_server = TRUE;

-        rlogin->prompt->name = dupstr("Rlogin login name");

-        add_prompt(rlogin->prompt, dupstr("rlogin username: "), TRUE); 

-        ret = get_userpass_input(rlogin->prompt, NULL, 0);

-        if (ret >= 0) {

-            rlogin_startup(rlogin, rlogin->prompt->prompts[0]->result);

-        }

-    }

-

-    return NULL;

-}

-

-static void rlogin_free(void *handle)

-{

-    Rlogin rlogin = (Rlogin) handle;

-

-    if (rlogin->prompt)

-        free_prompts(rlogin->prompt);

-    if (rlogin->s)

-	sk_close(rlogin->s);

-    conf_free(rlogin->conf);

-    sfree(rlogin);

-}

-

-/*

- * Stub routine (we don't have any need to reconfigure this backend).

- */

-static void rlogin_reconfig(void *handle, Conf *conf)

-{

-}

-

-/*

- * Called to send data down the rlogin connection.

- */

-static int rlogin_send(void *handle, char *buf, int len)

-{

-    Rlogin rlogin = (Rlogin) handle;

-

-    if (rlogin->s == NULL)

-	return 0;

-

-    if (rlogin->prompt) {

-        /*

-         * We're still prompting for a username, and aren't talking

-         * directly to the network connection yet.

-         */

-        int ret = get_userpass_input(rlogin->prompt,

-                                     (unsigned char *)buf, len);

-        if (ret >= 0) {

-            rlogin_startup(rlogin, rlogin->prompt->prompts[0]->result);

-            /* that nulls out rlogin->prompt, so then we'll start sending

-             * data down the wire in the obvious way */

-        }

-    } else {

-        rlogin->bufsize = sk_write(rlogin->s, buf, len);

-    }

-

-    return rlogin->bufsize;

-}

-

-/*

- * Called to query the current socket sendability status.

- */

-static int rlogin_sendbuffer(void *handle)

-{

-    Rlogin rlogin = (Rlogin) handle;

-    return rlogin->bufsize;

-}

-

-/*

- * Called to set the size of the window

- */

-static void rlogin_size(void *handle, int width, int height)

-{

-    Rlogin rlogin = (Rlogin) handle;

-    char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };

-

-    rlogin->term_width = width;

-    rlogin->term_height = height;

-

-    if (rlogin->s == NULL || !rlogin->cansize)

-	return;

-

-    b[6] = rlogin->term_width >> 8;

-    b[7] = rlogin->term_width & 0xFF;

-    b[4] = rlogin->term_height >> 8;

-    b[5] = rlogin->term_height & 0xFF;

-    rlogin->bufsize = sk_write(rlogin->s, b, 12);

-    return;

-}

-

-/*

- * Send rlogin special codes.

- */

-static void rlogin_special(void *handle, Telnet_Special code)

-{

-    /* Do nothing! */

-    return;

-}

-

-/*

- * Return a list of the special codes that make sense in this

- * protocol.

- */

-static const struct telnet_special *rlogin_get_specials(void *handle)

-{

-    return NULL;

-}

-

-static int rlogin_connected(void *handle)

-{

-    Rlogin rlogin = (Rlogin) handle;

-    return rlogin->s != NULL;

-}

-

-static int rlogin_sendok(void *handle)

-{

-    /* Rlogin rlogin = (Rlogin) handle; */

-    return 1;

-}

-

-static void rlogin_unthrottle(void *handle, int backlog)

-{

-    Rlogin rlogin = (Rlogin) handle;

-    sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG);

-}

-

-static int rlogin_ldisc(void *handle, int option)

-{

-    /* Rlogin rlogin = (Rlogin) handle; */

-    return 0;

-}

-

-static void rlogin_provide_ldisc(void *handle, void *ldisc)

-{

-    /* This is a stub. */

-}

-

-static void rlogin_provide_logctx(void *handle, void *logctx)

-{

-    /* This is a stub. */

-}

-

-static int rlogin_exitcode(void *handle)

-{

-    Rlogin rlogin = (Rlogin) handle;

-    if (rlogin->s != NULL)

-        return -1;                     /* still connected */

-    else

-        /* If we ever implement RSH, we'll probably need to do this properly */

-        return 0;

-}

-

-/*

- * cfg_info for rlogin does nothing at all.

- */

-static int rlogin_cfg_info(void *handle)

-{

-    return 0;

-}

-

-Backend rlogin_backend = {

-    rlogin_init,

-    rlogin_free,

-    rlogin_reconfig,

-    rlogin_send,

-    rlogin_sendbuffer,

-    rlogin_size,

-    rlogin_special,

-    rlogin_get_specials,

-    rlogin_connected,

-    rlogin_exitcode,

-    rlogin_sendok,

-    rlogin_ldisc,

-    rlogin_provide_ldisc,

-    rlogin_provide_logctx,

-    rlogin_unthrottle,

-    rlogin_cfg_info,

-    "rlogin",

-    PROT_RLOGIN,

-    513

-};

+/*
+ * Rlogin backend.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <ctype.h>
+
+#include "putty.h"
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+#ifndef TRUE
+#define TRUE 1
+#endif
+
+#define RLOGIN_MAX_BACKLOG 4096
+
+typedef struct rlogin_tag {
+    const struct plug_function_table *fn;
+    /* the above field _must_ be first in the structure */
+
+    Socket s;
+    int closed_on_socket_error;
+    int bufsize;
+    int firstbyte;
+    int cansize;
+    int term_width, term_height;
+    void *frontend;
+
+    Conf *conf;
+
+    /* In case we need to read a username from the terminal before starting */
+    prompts_t *prompt;
+} *Rlogin;
+
+static void rlogin_size(void *handle, int width, int height);
+
+static void c_write(Rlogin rlogin, char *buf, int len)
+{
+    int backlog = from_backend(rlogin->frontend, 0, buf, len);
+    sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG);
+}
+
+static void rlogin_log(Plug plug, int type, SockAddr addr, int port,
+		       const char *error_msg, int error_code)
+{
+    Rlogin rlogin = (Rlogin) plug;
+    char addrbuf[256], *msg;
+
+    sk_getaddr(addr, addrbuf, lenof(addrbuf));
+
+    if (type == 0)
+	msg = dupprintf("Connecting to %s port %d", addrbuf, port);
+    else
+	msg = dupprintf("Failed to connect to %s: %s", addrbuf, error_msg);
+
+    logevent(rlogin->frontend, msg);
+    sfree(msg);
+}
+
+static int rlogin_closing(Plug plug, const char *error_msg, int error_code,
+			  int calling_back)
+{
+    Rlogin rlogin = (Rlogin) plug;
+
+    /*
+     * We don't implement independent EOF in each direction for Telnet
+     * connections; as soon as we get word that the remote side has
+     * sent us EOF, we wind up the whole connection.
+     */
+
+    if (rlogin->s) {
+        sk_close(rlogin->s);
+        rlogin->s = NULL;
+        if (error_msg)
+            rlogin->closed_on_socket_error = TRUE;
+	notify_remote_exit(rlogin->frontend);
+    }
+    if (error_msg) {
+	/* A socket error has occurred. */
+	logevent(rlogin->frontend, error_msg);
+	connection_fatal(rlogin->frontend, "%s", error_msg);
+    }				       /* Otherwise, the remote side closed the connection normally. */
+    return 0;
+}
+
+static int rlogin_receive(Plug plug, int urgent, char *data, int len)
+{
+    Rlogin rlogin = (Rlogin) plug;
+    if (urgent == 2) {
+	char c;
+
+	c = *data++;
+	len--;
+	if (c == '\x80') {
+	    rlogin->cansize = 1;
+	    rlogin_size(rlogin, rlogin->term_width, rlogin->term_height);
+        }
+	/*
+	 * We should flush everything (aka Telnet SYNCH) if we see
+	 * 0x02, and we should turn off and on _local_ flow control
+	 * on 0x10 and 0x20 respectively. I'm not convinced it's
+	 * worth it...
+	 */
+    } else {
+	/*
+	 * Main rlogin protocol. This is really simple: the first
+	 * byte is expected to be NULL and is ignored, and the rest
+	 * is printed.
+	 */
+	if (rlogin->firstbyte) {
+	    if (data[0] == '\0') {
+		data++;
+		len--;
+	    }
+	    rlogin->firstbyte = 0;
+	}
+	if (len > 0)
+            c_write(rlogin, data, len);
+    }
+    return 1;
+}
+
+static void rlogin_sent(Plug plug, int bufsize)
+{
+    Rlogin rlogin = (Rlogin) plug;
+    rlogin->bufsize = bufsize;
+}
+
+static void rlogin_startup(Rlogin rlogin, const char *ruser)
+{
+    char z = 0;
+    char *p;
+
+    sk_write(rlogin->s, &z, 1);
+    p = conf_get_str(rlogin->conf, CONF_localusername);
+    sk_write(rlogin->s, p, strlen(p));
+    sk_write(rlogin->s, &z, 1);
+    sk_write(rlogin->s, ruser, strlen(ruser));
+    sk_write(rlogin->s, &z, 1);
+    p = conf_get_str(rlogin->conf, CONF_termtype);
+    sk_write(rlogin->s, p, strlen(p));
+    sk_write(rlogin->s, "/", 1);
+    p = conf_get_str(rlogin->conf, CONF_termspeed);
+    sk_write(rlogin->s, p, strspn(p, "0123456789"));
+    rlogin->bufsize = sk_write(rlogin->s, &z, 1);
+
+    rlogin->prompt = NULL;
+}
+
+/*
+ * Called to set up the rlogin connection.
+ * 
+ * Returns an error message, or NULL on success.
+ *
+ * Also places the canonical host name into `realhost'. It must be
+ * freed by the caller.
+ */
+static const char *rlogin_init(void *frontend_handle, void **backend_handle,
+			       Conf *conf,
+			       char *host, int port, char **realhost,
+			       int nodelay, int keepalive)
+{
+    static const struct plug_function_table fn_table = {
+	rlogin_log,
+	rlogin_closing,
+	rlogin_receive,
+	rlogin_sent
+    };
+    SockAddr addr;
+    const char *err;
+    Rlogin rlogin;
+    char *ruser;
+    int addressfamily;
+    char *loghost;
+
+    rlogin = snew(struct rlogin_tag);
+    rlogin->fn = &fn_table;
+    rlogin->s = NULL;
+    rlogin->closed_on_socket_error = FALSE;
+    rlogin->frontend = frontend_handle;
+    rlogin->term_width = conf_get_int(conf, CONF_width);
+    rlogin->term_height = conf_get_int(conf, CONF_height);
+    rlogin->firstbyte = 1;
+    rlogin->cansize = 0;
+    rlogin->prompt = NULL;
+    rlogin->conf = conf_copy(conf);
+    *backend_handle = rlogin;
+
+    addressfamily = conf_get_int(conf, CONF_addressfamily);
+    /*
+     * Try to find host.
+     */
+    {
+	char *buf;
+	buf = dupprintf("Looking up host \"%s\"%s", host,
+			(addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" :
+			 (addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" :
+			  "")));
+	logevent(rlogin->frontend, buf);
+	sfree(buf);
+    }
+    addr = name_lookup(host, port, realhost, conf, addressfamily);
+    if ((err = sk_addr_error(addr)) != NULL) {
+	sk_addr_free(addr);
+	return err;
+    }
+
+    if (port < 0)
+	port = 513;		       /* default rlogin port */
+
+    /*
+     * Open socket.
+     */
+    rlogin->s = new_connection(addr, *realhost, port, 1, 0,
+			       nodelay, keepalive, (Plug) rlogin, conf);
+    if ((err = sk_socket_error(rlogin->s)) != NULL)
+	return err;
+
+    loghost = conf_get_str(conf, CONF_loghost);
+    if (*loghost) {
+	char *colon;
+
+	sfree(*realhost);
+	*realhost = dupstr(loghost);
+
+	colon = host_strrchr(*realhost, ':');
+	if (colon)
+	    *colon++ = '\0';
+    }
+
+    /*
+     * Send local username, remote username, terminal type and
+     * terminal speed - unless we don't have the remote username yet,
+     * in which case we prompt for it and may end up deferring doing
+     * anything else until the local prompt mechanism returns.
+     */
+    if ((ruser = get_remote_username(conf)) != NULL) {
+        rlogin_startup(rlogin, ruser);
+        sfree(ruser);
+    } else {
+        int ret;
+
+        rlogin->prompt = new_prompts(rlogin->frontend);
+        rlogin->prompt->to_server = TRUE;
+        rlogin->prompt->name = dupstr("Rlogin login name");
+        add_prompt(rlogin->prompt, dupstr("rlogin username: "), TRUE); 
+        ret = get_userpass_input(rlogin->prompt, NULL, 0);
+        if (ret >= 0) {
+            rlogin_startup(rlogin, rlogin->prompt->prompts[0]->result);
+        }
+    }
+
+    return NULL;
+}
+
+static void rlogin_free(void *handle)
+{
+    Rlogin rlogin = (Rlogin) handle;
+
+    if (rlogin->prompt)
+        free_prompts(rlogin->prompt);
+    if (rlogin->s)
+	sk_close(rlogin->s);
+    conf_free(rlogin->conf);
+    sfree(rlogin);
+}
+
+/*
+ * Stub routine (we don't have any need to reconfigure this backend).
+ */
+static void rlogin_reconfig(void *handle, Conf *conf)
+{
+}
+
+/*
+ * Called to send data down the rlogin connection.
+ */
+static int rlogin_send(void *handle, char *buf, int len)
+{
+    Rlogin rlogin = (Rlogin) handle;
+
+    if (rlogin->s == NULL)
+	return 0;
+
+    if (rlogin->prompt) {
+        /*
+         * We're still prompting for a username, and aren't talking
+         * directly to the network connection yet.
+         */
+        int ret = get_userpass_input(rlogin->prompt,
+                                     (unsigned char *)buf, len);
+        if (ret >= 0) {
+            rlogin_startup(rlogin, rlogin->prompt->prompts[0]->result);
+            /* that nulls out rlogin->prompt, so then we'll start sending
+             * data down the wire in the obvious way */
+        }
+    } else {
+        rlogin->bufsize = sk_write(rlogin->s, buf, len);
+    }
+
+    return rlogin->bufsize;
+}
+
+/*
+ * Called to query the current socket sendability status.
+ */
+static int rlogin_sendbuffer(void *handle)
+{
+    Rlogin rlogin = (Rlogin) handle;
+    return rlogin->bufsize;
+}
+
+/*
+ * Called to set the size of the window
+ */
+static void rlogin_size(void *handle, int width, int height)
+{
+    Rlogin rlogin = (Rlogin) handle;
+    char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
+
+    rlogin->term_width = width;
+    rlogin->term_height = height;
+
+    if (rlogin->s == NULL || !rlogin->cansize)
+	return;
+
+    b[6] = rlogin->term_width >> 8;
+    b[7] = rlogin->term_width & 0xFF;
+    b[4] = rlogin->term_height >> 8;
+    b[5] = rlogin->term_height & 0xFF;
+    rlogin->bufsize = sk_write(rlogin->s, b, 12);
+    return;
+}
+
+/*
+ * Send rlogin special codes.
+ */
+static void rlogin_special(void *handle, Telnet_Special code)
+{
+    /* Do nothing! */
+    return;
+}
+
+/*
+ * Return a list of the special codes that make sense in this
+ * protocol.
+ */
+static const struct telnet_special *rlogin_get_specials(void *handle)
+{
+    return NULL;
+}
+
+static int rlogin_connected(void *handle)
+{
+    Rlogin rlogin = (Rlogin) handle;
+    return rlogin->s != NULL;
+}
+
+static int rlogin_sendok(void *handle)
+{
+    /* Rlogin rlogin = (Rlogin) handle; */
+    return 1;
+}
+
+static void rlogin_unthrottle(void *handle, int backlog)
+{
+    Rlogin rlogin = (Rlogin) handle;
+    sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG);
+}
+
+static int rlogin_ldisc(void *handle, int option)
+{
+    /* Rlogin rlogin = (Rlogin) handle; */
+    return 0;
+}
+
+static void rlogin_provide_ldisc(void *handle, void *ldisc)
+{
+    /* This is a stub. */
+}
+
+static void rlogin_provide_logctx(void *handle, void *logctx)
+{
+    /* This is a stub. */
+}
+
+static int rlogin_exitcode(void *handle)
+{
+    Rlogin rlogin = (Rlogin) handle;
+    if (rlogin->s != NULL)
+        return -1;                     /* still connected */
+    else if (rlogin->closed_on_socket_error)
+        return INT_MAX;     /* a socket error counts as an unclean exit */
+    else
+        /* If we ever implement RSH, we'll probably need to do this properly */
+        return 0;
+}
+
+/*
+ * cfg_info for rlogin does nothing at all.
+ */
+static int rlogin_cfg_info(void *handle)
+{
+    return 0;
+}
+
+Backend rlogin_backend = {
+    rlogin_init,
+    rlogin_free,
+    rlogin_reconfig,
+    rlogin_send,
+    rlogin_sendbuffer,
+    rlogin_size,
+    rlogin_special,
+    rlogin_get_specials,
+    rlogin_connected,
+    rlogin_exitcode,
+    rlogin_sendok,
+    rlogin_ldisc,
+    rlogin_provide_ldisc,
+    rlogin_provide_logctx,
+    rlogin_unthrottle,
+    rlogin_cfg_info,
+    "rlogin",
+    PROT_RLOGIN,
+    513
+};