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bcbf86ec | 1 | /* |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * | |
6 | * As far as I am concerned, the code I have written for this software | |
7 | * can be used freely for any purpose. Any derived versions of this | |
8 | * software must be clearly marked as such, and if the derived work is | |
9 | * incompatible with the protocol description in the RFC file, it must be | |
10 | * called by a name other than "ssh" or "Secure Shell". | |
11 | */ | |
12 | /* | |
8ab5f6b2 | 13 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
bcbf86ec | 14 | * |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions | |
17 | * are met: | |
18 | * 1. Redistributions of source code must retain the above copyright | |
19 | * notice, this list of conditions and the following disclaimer. | |
20 | * 2. Redistributions in binary form must reproduce the above copyright | |
21 | * notice, this list of conditions and the following disclaimer in the | |
22 | * documentation and/or other materials provided with the distribution. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
27 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
34 | */ | |
06ee33fb | 35 | /* RCSID("$OpenBSD: channels.h,v 1.63 2002/02/05 14:32:55 markus Exp $"); */ |
8efc0c15 | 36 | |
8e7895b8 | 37 | #ifndef CHANNEL_H |
38 | #define CHANNEL_H | |
8efc0c15 | 39 | |
01794848 | 40 | #include "buffer.h" |
41 | ||
8efc0c15 | 42 | /* Definitions for channel types. */ |
aa3378df | 43 | #define SSH_CHANNEL_X11_LISTENER 1 /* Listening for inet X11 conn. */ |
5260325f | 44 | #define SSH_CHANNEL_PORT_LISTENER 2 /* Listening on a port. */ |
45 | #define SSH_CHANNEL_OPENING 3 /* waiting for confirmation */ | |
46 | #define SSH_CHANNEL_OPEN 4 /* normal open two-way channel */ | |
aa3378df | 47 | #define SSH_CHANNEL_CLOSED 5 /* waiting for close confirmation */ |
7368a6c8 | 48 | #define SSH_CHANNEL_AUTH_SOCKET 6 /* authentication socket */ |
49 | #define SSH_CHANNEL_X11_OPEN 7 /* reading first X11 packet */ | |
50 | #define SSH_CHANNEL_INPUT_DRAINING 8 /* sending remaining data to conn */ | |
51 | #define SSH_CHANNEL_OUTPUT_DRAINING 9 /* sending remaining data to app */ | |
52 | #define SSH_CHANNEL_LARVAL 10 /* larval session */ | |
fa08c86b | 53 | #define SSH_CHANNEL_RPORT_LISTENER 11 /* Listening to a R-style port */ |
97fb6912 | 54 | #define SSH_CHANNEL_CONNECTING 12 |
0490e609 | 55 | #define SSH_CHANNEL_DYNAMIC 13 |
6fd8622b | 56 | #define SSH_CHANNEL_ZOMBIE 14 /* Almost dead. */ |
57 | #define SSH_CHANNEL_MAX_TYPE 15 | |
8efc0c15 | 58 | |
27c47c0a | 59 | #define SSH_CHANNEL_PATH_LEN 256 |
719fc62f | 60 | |
2e73a022 | 61 | struct Channel; |
62 | typedef struct Channel Channel; | |
63 | ||
2a1e4639 | 64 | typedef void channel_callback_fn(int, void *); |
65 | typedef int channel_filter_fn(struct Channel *, char *, int); | |
8efc0c15 | 66 | |
2e73a022 | 67 | struct Channel { |
5260325f | 68 | int type; /* channel type/state */ |
69 | int self; /* my own channel identifier */ | |
70 | int remote_id; /* channel identifier for remote peer */ | |
368e9dfc | 71 | u_int istate; /* input from channel (state of receive half) */ |
72 | u_int ostate; /* output to channel (state of transmit half) */ | |
7e7327a1 | 73 | int flags; /* close sent/rcvd */ |
7368a6c8 | 74 | int rfd; /* read fd */ |
75 | int wfd; /* write fd */ | |
76 | int efd; /* extended fd */ | |
77 | int sock; /* sock fd */ | |
0ae4fe1d | 78 | int isatty; /* rfd is a tty */ |
639cb8ab | 79 | int force_drain; /* force close on iEOF */ |
80 | int delayed; /* fdset hack */ | |
5260325f | 81 | Buffer input; /* data read from socket, to be sent over |
82 | * encrypted connection */ | |
83 | Buffer output; /* data received over encrypted connection for | |
84 | * send on socket */ | |
7368a6c8 | 85 | Buffer extended; |
719fc62f | 86 | char path[SSH_CHANNEL_PATH_LEN]; |
87 | /* path for unix domain sockets, or host name for forwards */ | |
5260325f | 88 | int listening_port; /* port being listened for forwards */ |
89 | int host_port; /* remote port to connect for forwards */ | |
90 | char *remote_name; /* remote hostname */ | |
7368a6c8 | 91 | |
92 | int remote_window; | |
93 | int remote_maxpacket; | |
94 | int local_window; | |
95 | int local_window_max; | |
96 | int local_consumed; | |
97 | int local_maxpacket; | |
98 | int extended_usage; | |
ac151b18 | 99 | int single_connection; |
7368a6c8 | 100 | |
101 | char *ctype; /* type */ | |
102 | ||
1d1ffb87 | 103 | /* callback */ |
05ca0898 | 104 | channel_callback_fn *confirm; |
3cf2be58 | 105 | channel_callback_fn *detach_user; |
2e73a022 | 106 | |
107 | /* filter */ | |
108 | channel_filter_fn *input_filter; | |
109 | }; | |
7368a6c8 | 110 | |
111 | #define CHAN_EXTENDED_IGNORE 0 | |
112 | #define CHAN_EXTENDED_READ 1 | |
113 | #define CHAN_EXTENDED_WRITE 2 | |
114 | ||
bcbf86ec | 115 | /* default window/packet sizes for tcp/x11-fwd-channel */ |
116 | #define CHAN_SES_WINDOW_DEFAULT (32*1024) | |
117 | #define CHAN_SES_PACKET_DEFAULT (CHAN_SES_WINDOW_DEFAULT/2) | |
118 | #define CHAN_TCP_WINDOW_DEFAULT (32*1024) | |
119 | #define CHAN_TCP_PACKET_DEFAULT (CHAN_TCP_WINDOW_DEFAULT/2) | |
120 | #define CHAN_X11_WINDOW_DEFAULT (4*1024) | |
121 | #define CHAN_X11_PACKET_DEFAULT (CHAN_X11_WINDOW_DEFAULT/2) | |
122 | ||
8e7895b8 | 123 | /* possible input states */ |
368e9dfc | 124 | #define CHAN_INPUT_OPEN 0 |
125 | #define CHAN_INPUT_WAIT_DRAIN 1 | |
126 | #define CHAN_INPUT_WAIT_OCLOSE 2 | |
127 | #define CHAN_INPUT_CLOSED 3 | |
bcbf86ec | 128 | |
8e7895b8 | 129 | /* possible output states */ |
368e9dfc | 130 | #define CHAN_OUTPUT_OPEN 0 |
131 | #define CHAN_OUTPUT_WAIT_DRAIN 1 | |
132 | #define CHAN_OUTPUT_WAIT_IEOF 2 | |
133 | #define CHAN_OUTPUT_CLOSED 3 | |
8e7895b8 | 134 | |
135 | #define CHAN_CLOSE_SENT 0x01 | |
136 | #define CHAN_CLOSE_RCVD 0x02 | |
137 | ||
8e7895b8 | 138 | /* channel management */ |
139 | ||
2a1e4639 | 140 | Channel *channel_lookup(int); |
141 | Channel *channel_new(char *, int, int, int, int, int, int, int, char *, int); | |
255cabd9 | 142 | void channel_set_fds(int, int, int, int, int, int); |
3cf2be58 | 143 | void channel_free(Channel *); |
144 | void channel_free_all(void); | |
3cf2be58 | 145 | void channel_stop_listening(void); |
255cabd9 | 146 | |
147 | void channel_send_open(int); | |
255cabd9 | 148 | void channel_request_start(int, char *, int); |
255cabd9 | 149 | void channel_register_cleanup(int, channel_callback_fn *); |
05ca0898 | 150 | void channel_register_confirm(int, channel_callback_fn *); |
255cabd9 | 151 | void channel_register_filter(int, channel_filter_fn *); |
152 | void channel_cancel_cleanup(int); | |
489aa2e9 | 153 | int channel_close_fd(int *); |
7368a6c8 | 154 | |
8e7895b8 | 155 | /* protocol handler */ |
7368a6c8 | 156 | |
7819b5c3 | 157 | void channel_input_close(int, u_int32_t, void *); |
158 | void channel_input_close_confirmation(int, u_int32_t, void *); | |
159 | void channel_input_data(int, u_int32_t, void *); | |
160 | void channel_input_extended_data(int, u_int32_t, void *); | |
161 | void channel_input_ieof(int, u_int32_t, void *); | |
162 | void channel_input_oclose(int, u_int32_t, void *); | |
163 | void channel_input_open_confirmation(int, u_int32_t, void *); | |
164 | void channel_input_open_failure(int, u_int32_t, void *); | |
165 | void channel_input_port_open(int, u_int32_t, void *); | |
166 | void channel_input_window_adjust(int, u_int32_t, void *); | |
7368a6c8 | 167 | |
8e7895b8 | 168 | /* file descriptor handling (read/write) */ |
7368a6c8 | 169 | |
489aa2e9 | 170 | void channel_prepare_select(fd_set **, fd_set **, int *, int*, int); |
255cabd9 | 171 | void channel_after_select(fd_set *, fd_set *); |
172 | void channel_output_poll(void); | |
7368a6c8 | 173 | |
255cabd9 | 174 | int channel_not_very_much_buffered_data(void); |
175 | void channel_close_all(void); | |
255cabd9 | 176 | int channel_still_open(void); |
177 | char *channel_open_message(void); | |
178 | int channel_find_open(void); | |
7368a6c8 | 179 | |
5e4a7219 | 180 | /* tcp forwarding */ |
181 | void channel_set_af(int af); | |
255cabd9 | 182 | void channel_permit_all_opens(void); |
183 | void channel_add_permitted_opens(char *, int); | |
184 | void channel_clear_permitted_opens(void); | |
185 | void channel_input_port_forward_request(int, int); | |
186 | int channel_connect_to(const char *, u_short); | |
b3f8a79c | 187 | int channel_connect_by_listen_address(u_short); |
255cabd9 | 188 | void channel_request_remote_forwarding(u_short, const char *, u_short); |
5641aefa | 189 | int channel_setup_local_fwd_listener(u_short, const char *, u_short, int); |
190 | int channel_setup_remote_fwd_listener(const char *, u_short, int); | |
7368a6c8 | 191 | |
8e7895b8 | 192 | /* x11 forwarding */ |
7368a6c8 | 193 | |
255cabd9 | 194 | int x11_connect_display(void); |
ac151b18 | 195 | int x11_create_display_inet(int, int, int); |
7819b5c3 | 196 | void x11_input_open(int, u_int32_t, void *); |
255cabd9 | 197 | void x11_request_forwarding_with_spoofing(int, const char *, const char *); |
7819b5c3 | 198 | void deny_input_open(int, u_int32_t, void *); |
7368a6c8 | 199 | |
8e7895b8 | 200 | /* agent forwarding */ |
7368a6c8 | 201 | |
255cabd9 | 202 | void auth_request_forwarding(void); |
203 | char *auth_get_socket_name(void); | |
204 | void auth_sock_cleanup_proc(void *); | |
205 | int auth_input_request_forwarding(struct passwd *); | |
7819b5c3 | 206 | void auth_input_open_request(int, u_int32_t, void *); |
7368a6c8 | 207 | |
8e7895b8 | 208 | /* channel close */ |
7e7327a1 | 209 | |
418e724c | 210 | int chan_is_dead(Channel *, int); |
255cabd9 | 211 | void chan_mark_dead(Channel *); |
255cabd9 | 212 | |
70bef40e | 213 | /* channel events */ |
8e7895b8 | 214 | |
70bef40e | 215 | void chan_rcvd_oclose(Channel *); |
216 | void chan_read_failed(Channel *); | |
217 | void chan_ibuf_empty(Channel *); | |
8e7895b8 | 218 | |
70bef40e | 219 | void chan_rcvd_ieof(Channel *); |
220 | void chan_write_failed(Channel *); | |
221 | void chan_obuf_empty(Channel *); | |
8e7895b8 | 222 | |
8efc0c15 | 223 | #endif |