X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/b47b21989c2dd9c7ce0e973b3730965f9d99b990..HEAD:/rlogin.c

diff --git a/rlogin.c b/rlogin.c
index 850d906d..f582f0c0 100644
--- a/rlogin.c
+++ b/rlogin.c
@@ -1,6 +1,11 @@
-#include <windows.h>
+/*
+ * Rlogin backend.
+ */
+
 #include <stdio.h>
 #include <stdlib.h>
+#include <limits.h>
+#include <ctype.h>
 
 #include "putty.h"
 
@@ -11,66 +16,198 @@
 #define TRUE 1
 #endif
 
-static Socket s = NULL;
+#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;
 
-static void rlogin_size(void);
+    Conf *conf;
 
-static int sb_opt, sb_len;
-static char *sb_buf = NULL;
-static int sb_size = 0;
-#define SB_DELTA 1024
+    /* In case we need to read a username from the terminal before starting */
+    prompts_t *prompt;
+} *Rlogin;
 
-static void c_write (char *buf, int len) {
-    from_backend(0, buf, len);
+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 int rlogin_receive (Socket skt, int urgent, char *data, int len) {
-    if (urgent==3) {
-        /* A socket error has occurred. */
-        sk_close(s);
-        s = NULL;
-        connection_fatal(data);
-        return 0;
-    } else if (!len) {
-	/* Connection has closed. */
-	sk_close(s);
-	s = NULL;
-	return 0;
+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 == 0x80)
-            rlogin_size();
-        /*
-         * 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...
-         */
+	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);
     }
-    c_write(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'.
+ * Also places the canonical host name into `realhost'. It must be
+ * freed by the caller.
  */
-static char *rlogin_init (char *host, int port, char **realhost) {
+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;
-    char *err;
+    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.
      */
-    addr = sk_namelookup(host, realhost);
-    if ( (err = sk_addr_error(addr)) )
+    {
+	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 */
@@ -78,80 +215,222 @@ static char *rlogin_init (char *host, int port, char **realhost) {
     /*
      * Open socket.
      */
-    s = sk_new(addr, port, 1, rlogin_receive);
-    if ( (err = sk_socket_error(s)) )
+    rlogin->s = new_connection(addr, *realhost, port, 1, 0,
+			       nodelay, keepalive, (Plug) rlogin, conf);
+    if ((err = sk_socket_error(rlogin->s)) != NULL)
 	return err;
 
-    sk_addr_free(addr);
+    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/speed
+     * 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;
 
-    {
-        char z = 0;
-        char *p;
-        sk_write(s, &z, 1);
-        sk_write(s, cfg.localusername, strlen(cfg.localusername));
-        sk_write(s, &z, 1);
-        sk_write(s, cfg.username, strlen(cfg.username));
-        sk_write(s, &z, 1);
-        sk_write(s, cfg.termtype, strlen(cfg.termtype));
-        sk_write(s, "/", 1);
-        for(p = cfg.termspeed; isdigit(*p); p++);
-        sk_write(s, cfg.termspeed, p - cfg.termspeed);
-        sk_write(s, &z, 1);
+        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 void rlogin_send (char *buf, int len) {
+static int rlogin_send(void *handle, char *buf, int len)
+{
+    Rlogin rlogin = (Rlogin) handle;
 
-    if (s == NULL)
-	return;
+    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);
+    }
 
-    sk_write(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) {
+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 };
 
-    b[6] = cols >> 8; b[7] = cols & 0xFF;
-    b[4] = rows >> 8; b[5] = rows & 0xFF;
-    sk_write(s, b, 12);
+    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 (Telnet_Special code) {
+static void rlogin_special(void *handle, Telnet_Special code)
+{
     /* Do nothing! */
     return;
 }
 
-static Socket rlogin_socket(void) { return s; }
+/*
+ * 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_sendok(void) { return 1; }
+static int rlogin_ldisc(void *handle, int option)
+{
+    /* Rlogin rlogin = (Rlogin) handle; */
+    return 0;
+}
 
-static int rlogin_ldisc(int option) {
+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_socket,
+    rlogin_get_specials,
+    rlogin_connected,
+    rlogin_exitcode,
     rlogin_sendok,
     rlogin_ldisc,
-    1
+    rlogin_provide_ldisc,
+    rlogin_provide_logctx,
+    rlogin_unthrottle,
+    rlogin_cfg_info,
+    "rlogin",
+    PROT_RLOGIN,
+    513
 };