зеркало из https://github.com/github/putty.git
338 строки
7.3 KiB
C
338 строки
7.3 KiB
C
/*
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* "Raw" backend.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.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 RAW_MAX_BACKLOG 4096
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typedef struct raw_backend_data {
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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 closed_on_socket_error;
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int bufsize;
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void *frontend;
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int sent_console_eof, sent_socket_eof, session_started;
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Conf *conf;
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} *Raw;
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static void raw_size(void *handle, int width, int height);
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static void c_write(Raw raw, char *buf, int len)
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{
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int backlog = from_backend(raw->frontend, 0, buf, len);
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sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG);
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}
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static void raw_log(Plug plug, int type, SockAddr addr, int port,
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const char *error_msg, int error_code)
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{
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Raw raw = (Raw) plug;
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backend_socket_log(raw->frontend, type, addr, port,
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error_msg, error_code, raw->conf, raw->session_started);
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}
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static void raw_check_close(Raw raw)
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{
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/*
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* Called after we send EOF on either the socket or the console.
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* Its job is to wind up the session once we have sent EOF on both.
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*/
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if (raw->sent_console_eof && raw->sent_socket_eof) {
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if (raw->s) {
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sk_close(raw->s);
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raw->s = NULL;
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notify_remote_exit(raw->frontend);
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}
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}
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}
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static int raw_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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Raw raw = (Raw) plug;
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if (error_msg) {
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/* A socket error has occurred. */
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if (raw->s) {
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sk_close(raw->s);
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raw->s = NULL;
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raw->closed_on_socket_error = TRUE;
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notify_remote_exit(raw->frontend);
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}
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logevent(raw->frontend, error_msg);
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connection_fatal(raw->frontend, "%s", error_msg);
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} else {
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/* Otherwise, the remote side closed the connection normally. */
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if (!raw->sent_console_eof && from_backend_eof(raw->frontend)) {
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/*
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* The front end wants us to close the outgoing side of the
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* connection as soon as we see EOF from the far end.
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*/
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if (!raw->sent_socket_eof) {
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if (raw->s)
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sk_write_eof(raw->s);
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raw->sent_socket_eof= TRUE;
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}
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}
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raw->sent_console_eof = TRUE;
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raw_check_close(raw);
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}
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return 0;
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}
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static int raw_receive(Plug plug, int urgent, char *data, int len)
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{
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Raw raw = (Raw) plug;
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c_write(raw, data, len);
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/* We count 'session start', for proxy logging purposes, as being
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* when data is received from the network and printed. */
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raw->session_started = TRUE;
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return 1;
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}
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static void raw_sent(Plug plug, int bufsize)
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{
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Raw raw = (Raw) plug;
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raw->bufsize = bufsize;
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}
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/*
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* Called to set up the raw 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 *raw_init(void *frontend_handle, void **backend_handle,
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Conf *conf,
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const 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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raw_log,
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raw_closing,
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raw_receive,
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raw_sent
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};
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SockAddr addr;
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const char *err;
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Raw raw;
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int addressfamily;
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char *loghost;
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raw = snew(struct raw_backend_data);
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raw->fn = &fn_table;
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raw->s = NULL;
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raw->closed_on_socket_error = FALSE;
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*backend_handle = raw;
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raw->sent_console_eof = raw->sent_socket_eof = FALSE;
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raw->bufsize = 0;
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raw->session_started = FALSE;
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raw->conf = conf_copy(conf);
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raw->frontend = frontend_handle;
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addressfamily = conf_get_int(conf, CONF_addressfamily);
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/*
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* Try to find host.
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*/
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addr = name_lookup(host, port, realhost, conf, addressfamily,
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raw->frontend, "main connection");
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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 = 23; /* default telnet port */
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/*
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* Open socket.
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*/
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raw->s = new_connection(addr, *realhost, port, 0, 1, nodelay, keepalive,
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(Plug) raw, conf);
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if ((err = sk_socket_error(raw->s)) != NULL)
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return err;
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loghost = conf_get_str(conf, CONF_loghost);
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if (*loghost) {
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char *colon;
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sfree(*realhost);
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*realhost = dupstr(loghost);
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colon = host_strrchr(*realhost, ':');
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if (colon)
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*colon++ = '\0';
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}
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return NULL;
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}
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static void raw_free(void *handle)
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{
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Raw raw = (Raw) handle;
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if (raw->s)
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sk_close(raw->s);
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conf_free(raw->conf);
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sfree(raw);
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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 raw_reconfig(void *handle, Conf *conf)
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{
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}
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/*
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* Called to send data down the raw connection.
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*/
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static int raw_send(void *handle, const char *buf, int len)
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{
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Raw raw = (Raw) handle;
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if (raw->s == NULL)
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return 0;
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raw->bufsize = sk_write(raw->s, buf, len);
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return raw->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 raw_sendbuffer(void *handle)
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{
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Raw raw = (Raw) handle;
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return raw->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 raw_size(void *handle, int width, int height)
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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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* Send raw special codes. We only handle outgoing EOF here.
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*/
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static void raw_special(void *handle, Telnet_Special code)
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{
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Raw raw = (Raw) handle;
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if (code == TS_EOF && raw->s) {
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sk_write_eof(raw->s);
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raw->sent_socket_eof= TRUE;
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raw_check_close(raw);
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}
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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 *raw_get_specials(void *handle)
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{
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return NULL;
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}
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static int raw_connected(void *handle)
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{
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Raw raw = (Raw) handle;
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return raw->s != NULL;
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}
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static int raw_sendok(void *handle)
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{
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return 1;
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}
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static void raw_unthrottle(void *handle, int backlog)
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{
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Raw raw = (Raw) handle;
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sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG);
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}
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static int raw_ldisc(void *handle, int option)
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{
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if (option == LD_EDIT || option == LD_ECHO)
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return 1;
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return 0;
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}
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static void raw_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 raw_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 raw_exitcode(void *handle)
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{
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Raw raw = (Raw) handle;
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if (raw->s != NULL)
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return -1; /* still connected */
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else if (raw->closed_on_socket_error)
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return INT_MAX; /* a socket error counts as an unclean exit */
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else
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/* Exit codes are a meaningless concept in the Raw protocol */
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return 0;
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}
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/*
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* cfg_info for Raw does nothing at all.
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*/
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static int raw_cfg_info(void *handle)
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{
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return 0;
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}
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Backend raw_backend = {
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raw_init,
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raw_free,
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raw_reconfig,
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raw_send,
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raw_sendbuffer,
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raw_size,
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raw_special,
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raw_get_specials,
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raw_connected,
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raw_exitcode,
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raw_sendok,
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raw_ldisc,
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raw_provide_ldisc,
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raw_provide_logctx,
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raw_unthrottle,
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raw_cfg_info,
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NULL /* test_for_upstream */,
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"raw",
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PROT_RAW,
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0
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};
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