15 #define GET_32BIT_LSB_FIRST(cp) \
16 (((unsigned long)(unsigned char)(cp)[0]) | \
17 ((unsigned long)(unsigned char)(cp)[1] << 8) | \
18 ((unsigned long)(unsigned char)(cp)[2] << 16) | \
19 ((unsigned long)(unsigned char)(cp)[3] << 24))
21 #define PUT_32BIT_LSB_FIRST(cp, value) ( \
23 (cp)[1] = (value) >> 8, \
24 (cp)[2] = (value) >> 16, \
25 (cp)[3] = (value) >> 24 )
27 #define GET_16BIT_LSB_FIRST(cp) \
28 (((unsigned long)(unsigned char)(cp)[0]) | \
29 ((unsigned long)(unsigned char)(cp)[1] << 8))
31 #define PUT_16BIT_LSB_FIRST(cp, value) ( \
33 (cp)[1] = (value) >> 8 )
35 #define GET_32BIT_MSB_FIRST(cp) \
36 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
37 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
38 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
39 ((unsigned long)(unsigned char)(cp)[3]))
41 #define PUT_32BIT_MSB_FIRST(cp, value) ( \
42 (cp)[0] = (value) >> 24, \
43 (cp)[1] = (value) >> 16, \
44 (cp)[2] = (value) >> 8, \
47 #define GET_16BIT_MSB_FIRST(cp) \
48 (((unsigned long)(unsigned char)(cp)[0] << 8) | \
49 ((unsigned long)(unsigned char)(cp)[1]))
51 #define PUT_16BIT_MSB_FIRST(cp, value) ( \
52 (cp)[0] = (value) >> 8, \
56 struct pfwd_queue *next;
61 struct plug_function_table *fn;
62 /* the above variable absolutely *must* be the first in this structure */
63 void *c; /* (channel) data used by ssh.c */
64 void *backhandle; /* instance of SSH backend itself */
65 /* Note that backhandle need not be filled in if c is non-NULL */
68 int throttled, throttle_override;
71 struct pfwd_queue *waiting;
74 void pfd_close(Socket s);
77 static int pfd_closing(Plug plug, char *error_msg, int error_code,
80 struct PFwdPrivate *pr = (struct PFwdPrivate *) plug;
83 * We have no way to communicate down the forwarded connection,
84 * so if an error occurred on the socket, we just ignore it
85 * and treat it like a proper close.
92 static int pfd_receive(Plug plug, int urgent, char *data, int len)
94 struct PFwdPrivate *pr = (struct PFwdPrivate *) plug;
96 if (sshfwd_write(pr->c, data, len) > 0) {
98 sk_set_frozen(pr->s, 1);
104 static void pfd_sent(Plug plug, int bufsize)
106 struct PFwdPrivate *pr = (struct PFwdPrivate *) plug;
108 sshfwd_unthrottle(pr->c, bufsize);
112 * Called when receiving a PORT OPEN from the server
114 char *pfd_newconnect(Socket *s, char *hostname, int port, void *c)
116 static struct plug_function_table fn_table = {
124 char *err, *dummy_realhost;
125 struct PFwdPrivate *pr;
130 addr = sk_namelookup(hostname, &dummy_realhost);
131 if ((err = sk_addr_error(addr)))
137 pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate));
139 pr->throttled = pr->throttle_override = 0;
142 pr->backhandle = NULL; /* we shouldn't need this */
144 pr->s = *s = new_connection(addr, dummy_realhost, port, 0, 1, 0, (Plug) pr);
145 if ((err = sk_socket_error(*s))) {
150 sk_set_private_ptr(*s, pr);
156 called when someone connects to the local port
159 static int pfd_accepting(Plug p, void *sock)
161 static struct plug_function_table fn_table = {
167 struct PFwdPrivate *pr, *org;
171 org = (struct PFwdPrivate *)p;
172 pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate));
176 pr->backhandle = org->backhandle;
178 pr->s = s = sk_register(sock, (Plug) pr);
179 if ((err = sk_socket_error(s))) {
184 pr->c = new_sock_channel(org->backhandle, s);
186 strcpy(pr->hostname, org->hostname);
187 pr->port = org->port;
188 pr->throttled = pr->throttle_override = 0;
192 sk_set_private_ptr(s, pr);
198 /* asks to forward to the specified host/port for this */
199 ssh_send_port_open(pr->c, pr->hostname, pr->port, "forwarding");
206 /* Add a new forwarding from port -> desthost:destport
207 sets up a listener on the local machine on port
209 char *pfd_addforward(char *desthost, int destport, int port, void *backhandle)
211 static 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(port, (Plug) pr, !cfg.lport_acceptall);
236 if ((err = sk_socket_error(s))) {
241 sk_set_private_ptr(s, pr);
246 void pfd_close(Socket s)
248 struct PFwdPrivate *pr;
253 pr = (struct PFwdPrivate *) sk_get_private_ptr(s);
260 void pfd_unthrottle(Socket s)
262 struct PFwdPrivate *pr;
265 pr = (struct PFwdPrivate *) sk_get_private_ptr(s);
268 sk_set_frozen(s, pr->throttled || pr->throttle_override);
271 void pfd_override_throttle(Socket s, int enable)
273 struct PFwdPrivate *pr;
276 pr = (struct PFwdPrivate *) sk_get_private_ptr(s);
278 pr->throttle_override = enable;
279 sk_set_frozen(s, pr->throttled || pr->throttle_override);
283 * Called to send data down the raw connection.
285 int pfd_send(Socket s, char *data, int len)
289 return sk_write(s, data, len);
293 void pfd_confirm(Socket s)
295 struct PFwdPrivate *pr;
300 pr = (struct PFwdPrivate *) sk_get_private_ptr(s);
303 sk_write(s, NULL, 0);