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synced 2025-03-15 03:23:02 -05:00

No very good reason, but I've occasionally wanted to frob it to see if it makes any difference to problems I'm having, and it was easy. Tested that it does actually cause keepalives on Windows (with tcpdump); should also work on Unix. Not implemented on Mac (does nothing), but then neither is TCP_NODELAY. Quite a big checkin, much of which is adding `keepalive' alongside `nodelay' in network function calls. [originally from svn r4309]
323 lines
7.0 KiB
C
323 lines
7.0 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, const 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(rlogin->frontend, "%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 const 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,
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int nodelay, int keepalive)
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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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const 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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sk_addr_free(addr);
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return err;
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}
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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, keepalive, (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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/*
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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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