-#include <windows.h>
+/*
+ * Rlogin backend.
+ */
+
#include <stdio.h>
#include <stdlib.h>
+#include <limits.h>
+#include <ctype.h>
#include "putty.h"
#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 */
/*
* 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
};
projects / u / mdw / putty / blobdiff