14 #define GET_32BIT_LSB_FIRST(cp) \
15 (((unsigned long)(unsigned char)(cp)[0]) | \
16 ((unsigned long)(unsigned char)(cp)[1] << 8) | \
17 ((unsigned long)(unsigned char)(cp)[2] << 16) | \
18 ((unsigned long)(unsigned char)(cp)[3] << 24))
20 #define PUT_32BIT_LSB_FIRST(cp, value) ( \
22 (cp)[1] = (value) >> 8, \
23 (cp)[2] = (value) >> 16, \
24 (cp)[3] = (value) >> 24 )
26 #define GET_16BIT_LSB_FIRST(cp) \
27 (((unsigned long)(unsigned char)(cp)[0]) | \
28 ((unsigned long)(unsigned char)(cp)[1] << 8))
30 #define PUT_16BIT_LSB_FIRST(cp, value) ( \
32 (cp)[1] = (value) >> 8 )
34 #define GET_32BIT_MSB_FIRST(cp) \
35 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
36 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
37 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
38 ((unsigned long)(unsigned char)(cp)[3]))
40 #define PUT_32BIT_MSB_FIRST(cp, value) ( \
41 (cp)[0] = (value) >> 24, \
42 (cp)[1] = (value) >> 16, \
43 (cp)[2] = (value) >> 8, \
46 #define GET_16BIT_MSB_FIRST(cp) \
47 (((unsigned long)(unsigned char)(cp)[0] << 8) | \
48 ((unsigned long)(unsigned char)(cp)[1]))
50 #define PUT_16BIT_MSB_FIRST(cp, value) ( \
51 (cp)[0] = (value) >> 8, \
55 struct pfwd_queue
*next
;
60 const struct plug_function_table
*fn
;
61 /* the above variable absolutely *must* be the first in this structure */
62 void *c
; /* (channel) data used by ssh.c */
63 void *backhandle
; /* instance of SSH backend itself */
64 /* Note that backhandle need not be filled in if c is non-NULL */
67 int throttled
, throttle_override
;
70 struct pfwd_queue
*waiting
;
74 static int pfd_closing(Plug plug
, char *error_msg
, int error_code
,
77 struct PFwdPrivate
*pr
= (struct PFwdPrivate
*) plug
;
80 * We have no way to communicate down the forwarded connection,
81 * so if an error occurred on the socket, we just ignore it
82 * and treat it like a proper close.
89 static int pfd_receive(Plug plug
, int urgent
, char *data
, int len
)
91 struct PFwdPrivate
*pr
= (struct PFwdPrivate
*) plug
;
93 if (sshfwd_write(pr
->c
, data
, len
) > 0) {
95 sk_set_frozen(pr
->s
, 1);
101 static void pfd_sent(Plug plug
, int bufsize
)
103 struct PFwdPrivate
*pr
= (struct PFwdPrivate
*) plug
;
105 sshfwd_unthrottle(pr
->c
, bufsize
);
109 * Called when receiving a PORT OPEN from the server
111 char *pfd_newconnect(Socket
*s
, char *hostname
, int port
, void *c
,
114 static const struct plug_function_table fn_table
= {
122 char *err
, *dummy_realhost
;
123 struct PFwdPrivate
*pr
;
128 addr
= name_lookup(hostname
, port
, &dummy_realhost
, cfg
);
129 if ((err
= sk_addr_error(addr
)) != NULL
)
135 pr
= (struct PFwdPrivate
*) smalloc(sizeof(struct PFwdPrivate
));
137 pr
->throttled
= pr
->throttle_override
= 0;
140 pr
->backhandle
= NULL
; /* we shouldn't need this */
142 pr
->s
= *s
= new_connection(addr
, dummy_realhost
, port
,
143 0, 1, 0, (Plug
) pr
, cfg
);
144 if ((err
= sk_socket_error(*s
)) != NULL
) {
149 sk_set_private_ptr(*s
, pr
);
155 called when someone connects to the local port
158 static int pfd_accepting(Plug p
, void *sock
)
160 static const struct plug_function_table fn_table
= {
166 struct PFwdPrivate
*pr
, *org
;
170 org
= (struct PFwdPrivate
*)p
;
171 pr
= (struct PFwdPrivate
*) smalloc(sizeof(struct PFwdPrivate
));
175 pr
->backhandle
= org
->backhandle
;
177 pr
->s
= s
= sk_register(sock
, (Plug
) pr
);
178 if ((err
= sk_socket_error(s
)) != NULL
) {
183 pr
->c
= new_sock_channel(org
->backhandle
, s
);
185 strcpy(pr
->hostname
, org
->hostname
);
186 pr
->port
= org
->port
;
187 pr
->throttled
= pr
->throttle_override
= 0;
191 sk_set_private_ptr(s
, pr
);
197 /* asks to forward to the specified host/port for this */
198 ssh_send_port_open(pr
->c
, pr
->hostname
, pr
->port
, "forwarding");
205 /* Add a new forwarding from port -> desthost:destport
206 sets up a listener on the local machine on (srcaddr:)port
208 char *pfd_addforward(char *desthost
, int destport
, char *srcaddr
, int port
,
209 void *backhandle
, const Config
*cfg
)
211 static const struct plug_function_table fn_table
= {
213 pfd_receive
, /* should not happen... */
214 pfd_sent
, /* also should not happen */
219 struct PFwdPrivate
*pr
;
225 pr
= (struct PFwdPrivate
*) smalloc(sizeof(struct PFwdPrivate
));
228 strcpy(pr
->hostname
, desthost
);
230 pr
->throttled
= pr
->throttle_override
= 0;
233 pr
->backhandle
= backhandle
;
235 pr
->s
= s
= new_listener(srcaddr
, port
, (Plug
) pr
,
236 !cfg
->lport_acceptall
, cfg
);
237 if ((err
= sk_socket_error(s
)) != NULL
) {
242 sk_set_private_ptr(s
, pr
);
247 void pfd_close(Socket s
)
249 struct PFwdPrivate
*pr
;
254 pr
= (struct PFwdPrivate
*) sk_get_private_ptr(s
);
261 void pfd_unthrottle(Socket s
)
263 struct PFwdPrivate
*pr
;
266 pr
= (struct PFwdPrivate
*) sk_get_private_ptr(s
);
269 sk_set_frozen(s
, pr
->throttled
|| pr
->throttle_override
);
272 void pfd_override_throttle(Socket s
, int enable
)
274 struct PFwdPrivate
*pr
;
277 pr
= (struct PFwdPrivate
*) sk_get_private_ptr(s
);
279 pr
->throttle_override
= enable
;
280 sk_set_frozen(s
, pr
->throttled
|| pr
->throttle_override
);
284 * Called to send data down the raw connection.
286 int pfd_send(Socket s
, char *data
, int len
)
290 return sk_write(s
, data
, len
);
294 void pfd_confirm(Socket s
)
296 struct PFwdPrivate
*pr
;
301 pr
= (struct PFwdPrivate
*) sk_get_private_ptr(s
);
304 sk_write(s
, NULL
, 0);