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/*
* "Raw" backend.
*/
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include "putty.h"
#define RAW_MAX_BACKLOG 4096
typedef struct Raw Raw;
struct Raw {
Socket *s;
bool closed_on_socket_error;
size_t bufsize;
Seat *seat;
LogContext *logctx;
Ldisc *ldisc;
bool sent_console_eof, sent_socket_eof, socket_connected;
char *description;
Conf *conf;
Plug plug;
Backend backend;
Interactor interactor;
};
static void raw_size(Backend *be, int width, int height);
static void c_write(Raw *raw, const void *buf, size_t len)
{
size_t backlog = seat_stdout(raw->seat, buf, len);
sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG);
}
static void raw_log(Plug *plug, PlugLogType type, SockAddr *addr, int port,
const char *error_msg, int error_code)
{
Raw *raw = container_of(plug, Raw, plug);
backend_socket_log(raw->seat, raw->logctx, type, addr, port, error_msg,
error_code, raw->conf, raw->socket_connected);
if (type == PLUGLOG_CONNECT_SUCCESS) {
raw->socket_connected = true;
if (raw->ldisc)
ldisc_check_sendok(raw->ldisc);
}
}
static void raw_check_close(Raw *raw)
{
/*
* Called after we send EOF on either the socket or the console.
* Its job is to wind up the session once we have sent EOF on both.
*/
if (raw->sent_console_eof && raw->sent_socket_eof) {
if (raw->s) {
sk_close(raw->s);
raw->s = NULL;
seat_notify_remote_exit(raw->seat);
seat_notify_remote_disconnect(raw->seat);
}
}
}
static void raw_closing(Plug *plug, PlugCloseType type, const char *error_msg)
{
Raw *raw = container_of(plug, Raw, plug);
if (type != PLUGCLOSE_NORMAL) {
/* A socket error has occurred. */
if (raw->s) {
sk_close(raw->s);
raw->s = NULL;
raw->closed_on_socket_error = true;
seat_notify_remote_exit(raw->seat);
seat_notify_remote_disconnect(raw->seat);
}
logevent(raw->logctx, error_msg);
if (type != PLUGCLOSE_USER_ABORT)
seat_connection_fatal(raw->seat, "%s", error_msg);
} else {
/* Otherwise, the remote side closed the connection normally. */
if (!raw->sent_console_eof && seat_eof(raw->seat)) {
/*
* The front end wants us to close the outgoing side of the
* connection as soon as we see EOF from the far end.
*/
if (!raw->sent_socket_eof) {
if (raw->s)
sk_write_eof(raw->s);
raw->sent_socket_eof= true;
}
}
raw->sent_console_eof = true;
raw_check_close(raw);
}
}
static void raw_receive(Plug *plug, int urgent, const char *data, size_t len)
{
Raw *raw = container_of(plug, Raw, plug);
c_write(raw, data, len);
}
static void raw_sent(Plug *plug, size_t bufsize)
{
Raw *raw = container_of(plug, Raw, plug);
raw->bufsize = bufsize;
seat_sent(raw->seat, raw->bufsize);
}
static const PlugVtable Raw_plugvt = {
.log = raw_log,
.closing = raw_closing,
.receive = raw_receive,
.sent = raw_sent,
};
static char *raw_description(Interactor *itr)
{
Raw *raw = container_of(itr, Raw, interactor);
return dupstr(raw->description);
}
static LogPolicy *raw_logpolicy(Interactor *itr)
{
Raw *raw = container_of(itr, Raw, interactor);
return log_get_policy(raw->logctx);
}
static Seat *raw_get_seat(Interactor *itr)
{
Raw *raw = container_of(itr, Raw, interactor);
return raw->seat;
}
static void raw_set_seat(Interactor *itr, Seat *seat)
{
Raw *raw = container_of(itr, Raw, interactor);
raw->seat = seat;
}
static const InteractorVtable Raw_interactorvt = {
.description = raw_description,
.logpolicy = raw_logpolicy,
.get_seat = raw_get_seat,
.set_seat = raw_set_seat,
};
/*
* Called to set up the raw connection.
*
* Returns an error message, or NULL on success.
*
* Also places the canonical host name into `realhost'. It must be
* freed by the caller.
*/
static char *raw_init(const BackendVtable *vt, Seat *seat,
Backend **backend_handle, LogContext *logctx,
Conf *conf, const char *host, int port,
char **realhost, bool nodelay, bool keepalive)
{
SockAddr *addr;
const char *err;
Raw *raw;
int addressfamily;
char *loghost;
raw = snew(Raw);
memset(raw, 0, sizeof(Raw));
raw->plug.vt = &Raw_plugvt;
raw->backend.vt = vt;
raw->interactor.vt = &Raw_interactorvt;
raw->backend.interactor = &raw->interactor;
raw->s = NULL;
raw->closed_on_socket_error = false;
*backend_handle = &raw->backend;
raw->sent_console_eof = raw->sent_socket_eof = false;
raw->bufsize = 0;
raw->socket_connected = false;
raw->conf = conf_copy(conf);
raw->description = default_description(vt, host, port);
raw->seat = seat;
raw->logctx = logctx;
addressfamily = conf_get_int(conf, CONF_addressfamily);
/*
* Try to find host.
*/
addr = name_lookup(host, port, realhost, conf, addressfamily,
raw->logctx, "main connection");
if ((err = sk_addr_error(addr)) != NULL) {
sk_addr_free(addr);
return dupstr(err);
}
if (port < 0)
port = 23; /* default telnet port */
/*
* Open socket.
*/
raw->s = new_connection(addr, *realhost, port, false, true, nodelay,
keepalive, &raw->plug, conf, &raw->interactor);
if ((err = sk_socket_error(raw->s)) != NULL)
return dupstr(err);
/* No local authentication phase in this protocol */
seat_set_trust_status(raw->seat, false);
loghost = conf_get_str(conf, CONF_loghost);
if (*loghost) {
char *colon;
sfree(*realhost);
*realhost = dupstr(loghost);
colon = host_strrchr(*realhost, ':');
if (colon)
*colon++ = '\0';
}
return NULL;
}
static void raw_free(Backend *be)
{
Raw *raw = container_of(be, Raw, backend);
if (is_tempseat(raw->seat))
tempseat_free(raw->seat);
if (raw->s)
sk_close(raw->s);
conf_free(raw->conf);
sfree(raw->description);
sfree(raw);
}
/*
* Stub routine (we don't have any need to reconfigure this backend).
*/
static void raw_reconfig(Backend *be, Conf *conf)
{
}
/*
* Called to send data down the raw connection.
*/
static void raw_send(Backend *be, const char *buf, size_t len)
{
Raw *raw = container_of(be, Raw, backend);
if (raw->s == NULL)
return;
raw->bufsize = sk_write(raw->s, buf, len);
}
/*
* Called to query the current socket sendability status.
*/
static size_t raw_sendbuffer(Backend *be)
{
Raw *raw = container_of(be, Raw, backend);
return raw->bufsize;
}
/*
* Called to set the size of the window
*/
static void raw_size(Backend *be, int width, int height)
{
/* Do nothing! */
return;
}
/*
* Send raw special codes. We only handle outgoing EOF here.
*/
static void raw_special(Backend *be, SessionSpecialCode code, int arg)
{
Raw *raw = container_of(be, Raw, backend);
if (code == SS_EOF && raw->s) {
sk_write_eof(raw->s);
raw->sent_socket_eof= true;
raw_check_close(raw);
}
return;
}
/*
* Return a list of the special codes that make sense in this
* protocol.
*/
static const SessionSpecial *raw_get_specials(Backend *be)
{
return NULL;
}
static bool raw_connected(Backend *be)
{
Raw *raw = container_of(be, Raw, backend);
return raw->s != NULL;
}
static bool raw_sendok(Backend *be)
{
Raw *raw = container_of(be, Raw, backend);
return raw->socket_connected;
}
static void raw_unthrottle(Backend *be, size_t backlog)
{
Raw *raw = container_of(be, Raw, backend);
sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG);
}
static bool raw_ldisc(Backend *be, int option)
{
if (option == LD_EDIT || option == LD_ECHO)
return true;
return false;
}
static void raw_provide_ldisc(Backend *be, Ldisc *ldisc)
{
Raw *raw = container_of(be, Raw, backend);
raw->ldisc = ldisc;
}
static int raw_exitcode(Backend *be)
{
Raw *raw = container_of(be, Raw, backend);
if (raw->s != NULL)
return -1; /* still connected */
else if (raw->closed_on_socket_error)
return INT_MAX; /* a socket error counts as an unclean exit */
else
/* Exit codes are a meaningless concept in the Raw protocol */
return 0;
}
/*
* cfg_info for Raw does nothing at all.
*/
static int raw_cfg_info(Backend *be)
{
return 0;
}
const BackendVtable raw_backend = {
.init = raw_init,
.free = raw_free,
.reconfig = raw_reconfig,
.send = raw_send,
.sendbuffer = raw_sendbuffer,
.size = raw_size,
.special = raw_special,
.get_specials = raw_get_specials,
.connected = raw_connected,
.exitcode = raw_exitcode,
.sendok = raw_sendok,
.ldisc_option_state = raw_ldisc,
.provide_ldisc = raw_provide_ldisc,
.unthrottle = raw_unthrottle,
.cfg_info = raw_cfg_info,
.id = "raw",
.displayname_tc = "Raw",
.displayname_lc = "raw",
.protocol = PROT_RAW,
.default_port = 0,
};
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