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3bd0415579
`Special Command' menu, in which any backend can place its own list of magical things the user might want to ask the backend to do. In particular I've implemented the recently proposed "break" extension in SSH2 using this mechanism. NB this checkin slightly breaks the Mac build, since it needs to provide at least a stub form of update_specials_menu(). [originally from svn r3054]
322 lines
6.9 KiB
C
322 lines
6.9 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include "putty.h"
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#ifndef FALSE
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#define FALSE 0
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#endif
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#ifndef TRUE
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#define TRUE 1
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#endif
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#define RLOGIN_MAX_BACKLOG 4096
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typedef struct rlogin_tag {
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const struct plug_function_table *fn;
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/* the above field _must_ be first in the structure */
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Socket s;
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int bufsize;
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int firstbyte;
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int term_width, term_height;
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void *frontend;
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} *Rlogin;
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static void rlogin_size(void *handle, int width, int height);
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static void c_write(Rlogin rlogin, char *buf, int len)
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{
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int backlog = from_backend(rlogin->frontend, 0, buf, len);
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sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG);
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}
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static int rlogin_closing(Plug plug, char *error_msg, int error_code,
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int calling_back)
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{
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Rlogin rlogin = (Rlogin) plug;
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if (rlogin->s) {
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sk_close(rlogin->s);
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rlogin->s = NULL;
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}
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if (error_msg) {
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/* A socket error has occurred. */
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logevent(rlogin->frontend, error_msg);
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connection_fatal("%s", error_msg);
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} /* Otherwise, the remote side closed the connection normally. */
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return 0;
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}
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static int rlogin_receive(Plug plug, int urgent, char *data, int len)
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{
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Rlogin rlogin = (Rlogin) plug;
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if (urgent == 2) {
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char c;
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c = *data++;
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len--;
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if (c == '\x80')
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rlogin_size(rlogin, rlogin->term_width, rlogin->term_height);
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/*
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* We should flush everything (aka Telnet SYNCH) if we see
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* 0x02, and we should turn off and on _local_ flow control
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* on 0x10 and 0x20 respectively. I'm not convinced it's
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* worth it...
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*/
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} else {
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/*
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* Main rlogin protocol. This is really simple: the first
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* byte is expected to be NULL and is ignored, and the rest
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* is printed.
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*/
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if (rlogin->firstbyte) {
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if (data[0] == '\0') {
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data++;
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len--;
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}
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rlogin->firstbyte = 0;
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}
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if (len > 0)
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c_write(rlogin, data, len);
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}
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return 1;
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}
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static void rlogin_sent(Plug plug, int bufsize)
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{
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Rlogin rlogin = (Rlogin) plug;
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rlogin->bufsize = bufsize;
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}
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/*
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* Called to set up the rlogin connection.
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*
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* Returns an error message, or NULL on success.
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*
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* Also places the canonical host name into `realhost'. It must be
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* freed by the caller.
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*/
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static char *rlogin_init(void *frontend_handle, void **backend_handle,
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Config *cfg,
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char *host, int port, char **realhost, int nodelay)
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{
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static const struct plug_function_table fn_table = {
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rlogin_closing,
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rlogin_receive,
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rlogin_sent
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};
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SockAddr addr;
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char *err;
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Rlogin rlogin;
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rlogin = snew(struct rlogin_tag);
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rlogin->fn = &fn_table;
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rlogin->s = NULL;
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rlogin->frontend = frontend_handle;
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rlogin->term_width = cfg->width;
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rlogin->term_height = cfg->height;
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rlogin->firstbyte = 1;
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*backend_handle = rlogin;
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/*
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* Try to find host.
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*/
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{
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char *buf;
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buf = dupprintf("Looking up host \"%s\"", host);
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logevent(rlogin->frontend, buf);
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sfree(buf);
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}
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addr = name_lookup(host, port, realhost, cfg);
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if ((err = sk_addr_error(addr)) != NULL)
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return err;
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if (port < 0)
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port = 513; /* default rlogin port */
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/*
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* Open socket.
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*/
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{
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char *buf, addrbuf[100];
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sk_getaddr(addr, addrbuf, 100);
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buf = dupprintf("Connecting to %s port %d", addrbuf, port);
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logevent(rlogin->frontend, buf);
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sfree(buf);
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}
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rlogin->s = new_connection(addr, *realhost, port, 1, 0,
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nodelay, (Plug) rlogin, cfg);
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if ((err = sk_socket_error(rlogin->s)) != NULL)
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return err;
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sk_addr_free(addr);
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/*
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* Send local username, remote username, terminal/speed
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*/
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{
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char z = 0;
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char *p;
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sk_write(rlogin->s, &z, 1);
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sk_write(rlogin->s, cfg->localusername,
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strlen(cfg->localusername));
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sk_write(rlogin->s, &z, 1);
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sk_write(rlogin->s, cfg->username,
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strlen(cfg->username));
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sk_write(rlogin->s, &z, 1);
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sk_write(rlogin->s, cfg->termtype,
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strlen(cfg->termtype));
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sk_write(rlogin->s, "/", 1);
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for (p = cfg->termspeed; isdigit((unsigned char)*p); p++) continue;
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sk_write(rlogin->s, cfg->termspeed, p - cfg->termspeed);
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rlogin->bufsize = sk_write(rlogin->s, &z, 1);
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}
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return NULL;
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}
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static void rlogin_free(void *handle)
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{
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Rlogin rlogin = (Rlogin) handle;
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if (rlogin->s)
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sk_close(rlogin->s);
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sfree(rlogin);
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}
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/*
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* Stub routine (we don't have any need to reconfigure this backend).
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*/
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static void rlogin_reconfig(void *handle, Config *cfg)
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{
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}
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/*
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* Called to send data down the rlogin connection.
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*/
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static int rlogin_send(void *handle, char *buf, int len)
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{
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Rlogin rlogin = (Rlogin) handle;
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if (rlogin->s == NULL)
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return 0;
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rlogin->bufsize = sk_write(rlogin->s, buf, len);
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return rlogin->bufsize;
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}
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/*
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* Called to query the current socket sendability status.
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*/
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static int rlogin_sendbuffer(void *handle)
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{
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Rlogin rlogin = (Rlogin) handle;
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return rlogin->bufsize;
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}
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/*
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* Called to set the size of the window
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*/
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static void rlogin_size(void *handle, int width, int height)
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{
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Rlogin rlogin = (Rlogin) handle;
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char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
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rlogin->term_width = width;
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rlogin->term_height = height;
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if (rlogin->s == NULL)
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return;
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b[6] = rlogin->term_width >> 8;
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b[7] = rlogin->term_width & 0xFF;
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b[4] = rlogin->term_height >> 8;
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b[5] = rlogin->term_height & 0xFF;
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rlogin->bufsize = sk_write(rlogin->s, b, 12);
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return;
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}
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/*
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* Send rlogin special codes.
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*/
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static void rlogin_special(void *handle, Telnet_Special code)
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{
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/* Do nothing! */
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return;
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}
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/*
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* Return a list of the special codes that make sense in this
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* protocol.
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*/
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static const struct telnet_special *rlogin_get_specials(void *handle)
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{
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return NULL;
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}
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static Socket rlogin_socket(void *handle)
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{
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Rlogin rlogin = (Rlogin) handle;
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return rlogin->s;
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}
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static int rlogin_sendok(void *handle)
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{
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/* Rlogin rlogin = (Rlogin) handle; */
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return 1;
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}
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static void rlogin_unthrottle(void *handle, int backlog)
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{
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Rlogin rlogin = (Rlogin) handle;
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sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG);
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}
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static int rlogin_ldisc(void *handle, int option)
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{
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/* Rlogin rlogin = (Rlogin) handle; */
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return 0;
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}
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static void rlogin_provide_ldisc(void *handle, void *ldisc)
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{
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/* This is a stub. */
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}
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static void rlogin_provide_logctx(void *handle, void *logctx)
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{
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/* This is a stub. */
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}
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static int rlogin_exitcode(void *handle)
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{
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Rlogin rlogin = (Rlogin) handle;
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if (rlogin->s != NULL)
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return -1; /* still connected */
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else
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/* If we ever implement RSH, we'll probably need to do this properly */
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return 0;
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}
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Backend rlogin_backend = {
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rlogin_init,
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rlogin_free,
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rlogin_reconfig,
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rlogin_send,
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rlogin_sendbuffer,
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rlogin_size,
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rlogin_special,
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rlogin_get_specials,
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rlogin_socket,
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rlogin_exitcode,
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rlogin_sendok,
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rlogin_ldisc,
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rlogin_provide_ldisc,
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rlogin_provide_logctx,
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rlogin_unthrottle,
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1
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};
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