2 * Dropbear - a SSH2 server
4 * Copyright (c) 2002,2003 Matt Johnston
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 #include "circbuffer.h"
32 /* channel->type values */
33 #define CHANNEL_ID_NONE 0
34 #define CHANNEL_ID_SESSION 1
35 #define CHANNEL_ID_X11 2
36 #define CHANNEL_ID_AGENT 3
37 #define CHANNEL_ID_TCPDIRECT 4
38 #define CHANNEL_ID_TCPFORWARDED 5
40 #define SSH_OPEN_ADMINISTRATIVELY_PROHIBITED 1
41 #define SSH_OPEN_CONNECT_FAILED 2
42 #define SSH_OPEN_UNKNOWN_CHANNEL_TYPE 3
43 #define SSH_OPEN_RESOURCE_SHORTAGE 4
46 #define SSH_OPEN_IN_PROGRESS 99
48 #define MAX_CHANNELS 100 /* simple mem restriction, includes each tcp/x11
49 connection, so can't be _too_ small */
51 #define CHAN_EXTEND_SIZE 3 /* how many extra slots to add when we need more */
53 #define RECV_MAXWINDOW 8000 /* tweak */
54 #define RECV_WINDOWEXTEND 1000 /* We send a "window extend" every
55 RECV_WINDOWEXTEND bytes */
56 #define RECV_MAXPACKET RECV_MAXWINDOW /* tweak */
62 unsigned int index; /* the local channel index */
63 unsigned int remotechan;
64 unsigned int recvwindow, transwindow;
65 unsigned int recvdonelen;
66 unsigned int recvmaxpacket, transmaxpacket;
67 void* typedata; /* a pointer to type specific data */
68 int infd; /* data to send over the wire */
69 int outfd; /* data for consumption, what was in writebuf */
70 int errfd; /* used like infd or errfd, depending if it's client or server.
71 Doesn't exactly belong here, but is cleaner here */
72 circbuffer *writebuf; /* data from the wire, for local consumption */
73 circbuffer *extrabuf; /* extended-data for the program - used like writebuf
76 int sentclosed, recvclosed;
78 /* this is set when we receive/send a channel eof packet */
81 int initconn; /* used for TCP forwarding, whether the channel has been
84 const struct ChanType* type;
90 int sepfds; /* Whether this channel has seperate pipes for in/out or not */
92 int (*inithandler)(struct Channel*);
93 int (*checkclose)(struct Channel*);
94 void (*reqhandler)(struct Channel*);
95 void (*closehandler)(struct Channel*);
99 void chaninitialise();
101 void setchannelfds(fd_set *readfd, fd_set *writefd);
102 void channelio(fd_set *readfd, fd_set *writefd);
103 struct Channel* getchannel();
104 struct Channel* newchannel(unsigned int remotechan,
105 const struct ChanType *type,
106 unsigned int transwindow, unsigned int transmaxpacket);
108 void recv_msg_channel_open();
109 void recv_msg_channel_request();
110 void send_msg_channel_failure(struct Channel *channel);
111 void send_msg_channel_success(struct Channel *channel);
112 void recv_msg_channel_data();
113 void recv_msg_channel_extended_data();
114 void recv_msg_channel_window_adjust();
115 void recv_msg_channel_close();
116 void recv_msg_channel_eof();
118 void common_recv_msg_channel_data(struct Channel *channel, int fd,
121 #ifdef DROPBEAR_CLIENT
122 const struct ChanType clichansess;
125 #if defined(USING_LISTENERS) || defined(DROPBEAR_CLIENT)
126 int send_msg_channel_open_init(int fd, const struct ChanType *type);
127 void recv_msg_channel_open_confirmation();
128 void recv_msg_channel_open_failure();
131 #endif /* _CHANNEL_H_ */