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annotate channel.h @ 618:b5cc8878d5ec

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Properly fix the bug found years ago by Klocwork, refound again.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 07 Apr 2011 13:33:26 +0000
parents cf376c696dfc
children 17962b2a6b8f
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #ifndef _CHANNEL_H_
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26 #define _CHANNEL_H_
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27
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28 #include "includes.h"
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29 #include "buffer.h"
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30 #include "circbuffer.h"
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31
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32 /* channel->type values */
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33 #define CHANNEL_ID_NONE 0
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34 #define CHANNEL_ID_SESSION 1
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35 #define CHANNEL_ID_X11 2
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36 #define CHANNEL_ID_AGENT 3
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37 #define CHANNEL_ID_TCPDIRECT 4
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38 #define CHANNEL_ID_TCPFORWARDED 5
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39
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40 #define SSH_OPEN_ADMINISTRATIVELY_PROHIBITED 1
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41 #define SSH_OPEN_CONNECT_FAILED 2
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42 #define SSH_OPEN_UNKNOWN_CHANNEL_TYPE 3
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43 #define SSH_OPEN_RESOURCE_SHORTAGE 4
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44
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45 /* Not a real type */
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46 #define SSH_OPEN_IN_PROGRESS 99
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47
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48 #define CHAN_EXTEND_SIZE 3 /* how many extra slots to add when we need more */
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49
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50 struct ChanType;
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51
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52 struct Channel {
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53
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54 unsigned int index; /* the local channel index */
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55 unsigned int remotechan;
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56 unsigned int recvwindow, transwindow;
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57 unsigned int recvdonelen;
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58 unsigned int recvmaxpacket, transmaxpacket;
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59 void* typedata; /* a pointer to type specific data */
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60 int writefd; /* read from wire, written to insecure side */
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61 int readfd; /* read from insecure side, written to wire */
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62 int errfd; /* used like writefd or readfd, depending if it's client or server.
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63 Doesn't exactly belong here, but is cleaner here */
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64 circbuffer *writebuf; /* data from the wire, for local consumption */
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65 circbuffer *extrabuf; /* extended-data for the program - used like writebuf
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66 but for stderr */
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68 /* whether close/eof messages have been exchanged */
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69 int sent_close, recv_close;
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70 int recv_eof, sent_eof;
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72 int initconn; /* used for TCP forwarding, whether the channel has been
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73 fully initialised */
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74
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75 int await_open; /* flag indicating whether we've sent an open request
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76 for this channel (and are awaiting a confirmation
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77 or failure). */
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78
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79 int flushing;
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80
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81 const struct ChanType* type;
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83 };
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84
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85 struct ChanType {
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86
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87 int sepfds; /* Whether this channel has seperate pipes for in/out or not */
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88 char *name;
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89 int (*inithandler)(struct Channel*);
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90 int (*check_close)(struct Channel*);
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91 void (*reqhandler)(struct Channel*);
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92 void (*closehandler)(struct Channel*);
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93
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94 };
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95
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96 void chaninitialise(const struct ChanType *chantypes[]);
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97 void chancleanup();
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98 void setchannelfds(fd_set *readfd, fd_set *writefd);
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99 void channelio(fd_set *readfd, fd_set *writefd);
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100 struct Channel* getchannel();
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101 struct Channel* newchannel(unsigned int remotechan,
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102 const struct ChanType *type,
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103 unsigned int transwindow, unsigned int transmaxpacket);
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104
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105 void recv_msg_channel_open();
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106 void recv_msg_channel_request();
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107 void send_msg_channel_failure(struct Channel *channel);
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108 void send_msg_channel_success(struct Channel *channel);
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109 void recv_msg_channel_data();
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110 void recv_msg_channel_extended_data();
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111 void recv_msg_channel_window_adjust();
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112 void recv_msg_channel_close();
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113 void recv_msg_channel_eof();
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114
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115 void common_recv_msg_channel_data(struct Channel *channel, int fd,
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116 circbuffer * buf);
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117
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118 #ifdef DROPBEAR_CLIENT
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119 extern const struct ChanType clichansess;
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120 #endif
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121
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122 #if defined(USING_LISTENERS) || defined(DROPBEAR_CLIENT)
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123 int send_msg_channel_open_init(int fd, const struct ChanType *type);
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124 void recv_msg_channel_open_confirmation();
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125 void recv_msg_channel_open_failure();
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126 #endif
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128 #endif /* _CHANNEL_H_ */