diff options
Diffstat (limited to '')
-rw-r--r-- | src/connection.h | 387 |
1 files changed, 387 insertions, 0 deletions
diff --git a/src/connection.h b/src/connection.h new file mode 100644 index 0000000..efb8630 --- /dev/null +++ b/src/connection.h | |||
@@ -0,0 +1,387 @@ | |||
1 | /**\file | ||
2 | * Contains the Connection class. | ||
3 | *@author Mike Buland | ||
4 | */ | ||
5 | |||
6 | #ifndef CONNECTION_H | ||
7 | #define CONNECTION_H | ||
8 | |||
9 | #include "multilog.h" | ||
10 | #include "flexbuf.h" | ||
11 | #include "protocol.h" | ||
12 | |||
13 | /** Represents a single connection on a network. While these connections | ||
14 | * may be treated more or less just like files, occasionally problems arise | ||
15 | * when writing data at any time you feel like. Therefore you run all your | ||
16 | * data through a Connection, which buffers all data and makes sure no | ||
17 | * buffers are exceeded and nothing inappropriate for the recipient of the | ||
18 | * data is sent. | ||
19 | *@author Mike Buland | ||
20 | */ | ||
21 | class Connection | ||
22 | { | ||
23 | public: | ||
24 | /** | ||
25 | * Construct a blank and non-connected Connection. The created object is | ||
26 | * not yet connected to anything, and most of the functions except open are | ||
27 | * unusable. | ||
28 | */ | ||
29 | Connection(); | ||
30 | |||
31 | /** | ||
32 | * Destroy the connection, clean up all pending data requests and close the | ||
33 | * contained socket. This does not send out pending data, especially since | ||
34 | * such an operation could take considerable time, depending on the pending | ||
35 | * data and state of the receiving end. | ||
36 | */ | ||
37 | ~Connection(); | ||
38 | |||
39 | /** | ||
40 | * Open a connection to a remote server. This sets up this connection as | ||
41 | * a client instead of a server and does all of the work that needs to be | ||
42 | * done to actually open an INET_AF connection, which is a lot of work. | ||
43 | *@param sAddr The address to connect to. This can be in any format | ||
44 | * normally understood by your system to be an address, ip, domain name, | ||
45 | * etc. | ||
46 | *@param nPort The port number to connect to on the remote server. | ||
47 | *@returns True if the connection was successful and everything is setup, | ||
48 | * false if there were any of a dozen errors and the connection is not set. | ||
49 | *@todo Make this function add log entries to a standard MultiLog if | ||
50 | * something goes wrong. | ||
51 | */ | ||
52 | bool open( const char *sAddr, int nPort ); | ||
53 | |||
54 | /** Append the given data to the output. The data is presumed to be null | ||
55 | * terminated. To put binary data into the stream, use the other | ||
56 | * appendOutput function. This should be the only method used to | ||
57 | * communicate with the socket. | ||
58 | *@param lpOutput The data to add to the output queue. | ||
59 | *@param nSize How much data is in the lpOutput buffer. If this value | ||
60 | * is -1 then the program treats lpOutput as a null-terminated string. | ||
61 | *@returns True if everything is ok, false otherwise. | ||
62 | */ | ||
63 | bool appendOutput( const char *lpOutput, int nSize=-1 ); | ||
64 | |||
65 | /** | ||
66 | * Append the character to the output. | ||
67 | *@param lOutput The character to add to the output queue. | ||
68 | *@returns True if everything is ok, false otherwise. | ||
69 | */ | ||
70 | bool appendOutput( const char lOutput ); | ||
71 | |||
72 | /** | ||
73 | * Append the short to the output. | ||
74 | *@param lOutput The short to add to the output queue. | ||
75 | *@returns True if everything is ok, false otherwise. | ||
76 | */ | ||
77 | bool appendOutput( const short lOutput ); | ||
78 | |||
79 | /** | ||
80 | * Append the int to the output. | ||
81 | *@param lOutput The int to add to the output queue. | ||
82 | *@returns True if everything is ok, false otherwise. | ||
83 | */ | ||
84 | bool appendOutput( const int lOutput ); | ||
85 | |||
86 | /** | ||
87 | * Append the long to the output. | ||
88 | *@param lOutput The long to add to the output queue. | ||
89 | *@returns True if everything is ok, false otherwise. | ||
90 | */ | ||
91 | bool appendOutput( const long lOutput ); | ||
92 | |||
93 | /** | ||
94 | * Append the float to the output. | ||
95 | *@param lOutput The float to add to the output queue. | ||
96 | *@returns True if everything is ok, false otherwise. | ||
97 | */ | ||
98 | bool appendOutput( const float lOutput ); | ||
99 | |||
100 | /** | ||
101 | * Append the double to the output. | ||
102 | *@param lOutput The double to add to the output queue. | ||
103 | *@returns True if everything is ok, false otherwise. | ||
104 | */ | ||
105 | bool appendOutput( const double lOutput ); | ||
106 | |||
107 | /** | ||
108 | * Append the unsigned char to the output. | ||
109 | *@param lOutput The unsigned char to add to the output queue. | ||
110 | *@returns True if everything is ok, false otherwise. | ||
111 | */ | ||
112 | bool appendOutput( const unsigned char lOutput ); | ||
113 | |||
114 | /** | ||
115 | * Append the unsigned short to the output. | ||
116 | *@param lOutput The unsigned short to add to the output queue. | ||
117 | *@returns True if everything is ok, false otherwise. | ||
118 | */ | ||
119 | bool appendOutput( const unsigned short lOutput ); | ||
120 | |||
121 | /** | ||
122 | * Append the unsigned int to the output. | ||
123 | *@param lOutput The unsigned int to add to the output queue. | ||
124 | *@returns True if everything is ok, false otherwise. | ||
125 | */ | ||
126 | bool appendOutput( const unsigned int lOutput ); | ||
127 | |||
128 | /** | ||
129 | * Append the unsigned long to the output. | ||
130 | *@param lOutput The unsigned long to add to the output queue. | ||
131 | *@returns True if everything is ok, false otherwise. | ||
132 | */ | ||
133 | bool appendOutput( const unsigned long lOutput ); | ||
134 | |||
135 | /** | ||
136 | * Writes all input data in the buffer in a dual-view ascii and hex display | ||
137 | * to a file. There are a number of options that also help with debugging. | ||
138 | *@param lpPrefix Text to be added to the begining of every line written | ||
139 | * out. The default is a blank string. | ||
140 | *@param fh The file to write the data to in text mode. This is stdout by | ||
141 | * default, but could be any already open file handle. | ||
142 | *@param nBytesMax The maximum number of bytes to write to the output. The | ||
143 | * amount of data can be overwhelming sometimes, so you can limit it. The | ||
144 | * default value is -1, which is also unlimited. | ||
145 | */ | ||
146 | void printInputDebug( const char *lpPrefix="", FILE *fh=stdout, int nBytesMax=-1 ); | ||
147 | |||
148 | /** | ||
149 | * Writes all output data in the buffer in a dual-view ascii and hex display | ||
150 | * to a file. There are a number of options that also help with debugging. | ||
151 | *@param lpPrefix Text to be added to the begining of every line written | ||
152 | * out. The default is a blank string. | ||
153 | *@param fh The file to write the data to in text mode. This is stdout by | ||
154 | * default, but could be any already open file handle. | ||
155 | *@param nBytesMax The maximum number of bytes to write to the output. The | ||
156 | * amount of data can be overwhelming sometimes, so you can limit it. The | ||
157 | * default value is -1, which is also unlimited. | ||
158 | */ | ||
159 | void printOutputDebug( const char *lpPrefix="", FILE *fh=stdout, int nBytesMax=-1 ); | ||
160 | |||
161 | /** | ||
162 | * This is the low-level generic function that is called by both | ||
163 | * printInputDebug and printOutputDebug. It works effectively just like | ||
164 | * both of them, except that you can give it a raw pointer to the data to | ||
165 | * print out. This probably doesn't belong in this class, but this was | ||
166 | * where I was when I needed it. | ||
167 | *@param pData A pointer to the data to write. This is not treated as a | ||
168 | * null terminated string, so make sure that the nDataLen param is set | ||
169 | * properly. | ||
170 | *@param nDataLen The number of bytes that are in pData and that you want to | ||
171 | * see. | ||
172 | *@param lpName The name of the data, this is used in the header where it | ||
173 | * says "Displaying nnn bytes of <lpName>." A good example would be input | ||
174 | * or output. | ||
175 | *@param lpPrefix Text to put before every line output. This just makes it | ||
176 | * easier to tell large blocks apart in the output. | ||
177 | *@param fh The file handle to write all data to. | ||
178 | *@param nBytesMax The maximum number of bytes. This parameter is stupid. | ||
179 | * If it is set to -1, then nDataLen is used, otherwise the smaller value is | ||
180 | * used as the number of bytes to output. | ||
181 | *@todo Put this function somewhere more deserving. | ||
182 | *@todo Remove the nBytesMax param, we need that in the other functions, | ||
183 | * not this one! | ||
184 | */ | ||
185 | void printDataDebug( const unsigned char *pData, long nDataLen, const char *lpName, const char *lpPrefix, FILE *fh, int nBytesMax ); | ||
186 | |||
187 | /** Append the given data to the input. The data is presumed to be null | ||
188 | * terminated. To put binary data into the stream, use the other | ||
189 | * appendInput function. This is mainly used by internal routines. | ||
190 | *@param lpInput The data to add to the input queue. | ||
191 | *@param nSize How much data is in the lpInput buffer. If this value | ||
192 | * is -1 then the program treats lpOutput as a null-terminated string. | ||
193 | *@returns True if everything is ok, false otherwise. | ||
194 | */ | ||
195 | bool appendInput( const char *lpInput, int nSize=-1 ); | ||
196 | |||
197 | /** Searches through the current pending input for a certain character. | ||
198 | * This is useful for finding out where exactly the end of a line is, for | ||
199 | * example, to see if a command has been entered yet. | ||
200 | *@param cTarget The character to search for. | ||
201 | *@returns The position of the target relative to the begining of the input | ||
202 | * or -1 if the target wasn't found. | ||
203 | */ | ||
204 | int scanInputFor( char cTarget ); | ||
205 | |||
206 | /** Gets a pointer to the output buffer. This is mainly used by internal | ||
207 | * routines, and is cleared every click when data is sent out again. | ||
208 | *@returns A pointer to the buffer holding the pending output data. | ||
209 | */ | ||
210 | const char *getOutput(); | ||
211 | |||
212 | /** Gets a pointer to the start of the input buffer's active data | ||
213 | * section. Use this to gain access to the input you need to do | ||
214 | * your job. | ||
215 | *@returns A pointer to the data in the input buffer. Do not delete this. | ||
216 | */ | ||
217 | const char *getInput(); | ||
218 | |||
219 | /** Clears all pending output, this is mainly just used internally. | ||
220 | *@returns True if operation was a success, otherwise false. | ||
221 | */ | ||
222 | bool clearOutput(); | ||
223 | |||
224 | /** Clears all pending input, weather it's been used or not. Please | ||
225 | * refrain from calling this during normal operation, use usedInput | ||
226 | * instead, it's much safer. | ||
227 | *@returns True if the operation was a success, false otherwise. | ||
228 | */ | ||
229 | bool clearInput(); | ||
230 | |||
231 | /** Sets the socket that should be used internally. | ||
232 | *@param nNewSocket The new socket to work with. | ||
233 | */ | ||
234 | void setSocket( int nNewSocket ); | ||
235 | |||
236 | /** Gets the handle (number) of the working socket. This can be a | ||
237 | * dangerous function to call, please refrain from calling it directly | ||
238 | * if any alternative can be found. | ||
239 | *@returns The number of the working socket. | ||
240 | */ | ||
241 | int getSocket(); | ||
242 | |||
243 | /** Determines if the connection is still active. | ||
244 | *@returns True if the connection is active, false otherwise. | ||
245 | */ | ||
246 | bool isActive(); | ||
247 | |||
248 | /** Clears all buffers and sets up the connection to be reused. | ||
249 | * Does not actually close the socket, that's handled by the | ||
250 | * ConnectionManager | ||
251 | */ | ||
252 | void close(); | ||
253 | |||
254 | /** Opens a socket. Really just sets up the connection for use since | ||
255 | * the socket itself was created and opened by the ConnectionManager. | ||
256 | * This also calls setSocket so you don't have to. | ||
257 | *@param nNewSocket The socket to assosiate with. | ||
258 | */ | ||
259 | bool open( int nNewSocket ); | ||
260 | |||
261 | /** | ||
262 | * Reads all pending input from the connection. If this is called outside | ||
263 | * of the ConnectionManager it will usually block indefinately waiting for | ||
264 | * new data. The only way to change this behaviour is to modify the socket | ||
265 | * low-level when you connect it manually, or, preferably use the other | ||
266 | * readInput function to control blocking time. | ||
267 | *@returns True socket is still connected, otherwise false. | ||
268 | */ | ||
269 | bool readInput(); | ||
270 | |||
271 | /** | ||
272 | * Reads all pending input from the connection, blocking up to nSec | ||
273 | * seconds and nUSec micro-seconds for the data. This uses select to | ||
274 | * simulate blocking, but has the same effect as standard io blocking. | ||
275 | * If you don't want to block, just set both values to zero. | ||
276 | *@param nSec Max seconds to wait. | ||
277 | *@param nUSec Max micro-seconds to wait. | ||
278 | */ | ||
279 | bool readInput( int nSec, int nUSec ); | ||
280 | |||
281 | /** Writes all data that is pending to the socket. | ||
282 | *@returns True if all data was written succesfully, false otherwise. | ||
283 | */ | ||
284 | bool writeOutput(); | ||
285 | |||
286 | /** Determines if the connection has output waiting to go out. | ||
287 | *@returns true if there is pending output, otherwise false. | ||
288 | */ | ||
289 | bool hasOutput(); | ||
290 | |||
291 | /** Sets internal flags so that this connection will be deleted next | ||
292 | * time through the ConnectionManager. | ||
293 | */ | ||
294 | void disconnect(); | ||
295 | |||
296 | /** Determines if this connection is ready to be disconnected or not. | ||
297 | *@returns True if it is time to disconnect, false if it isn't. | ||
298 | */ | ||
299 | bool needDisconnect(); | ||
300 | |||
301 | /** Tells the caller if there is pending input waiting to be processed. | ||
302 | *@returns True if there is pending input that has not been used, returns | ||
303 | * false if there isn't. | ||
304 | */ | ||
305 | bool hasInput(); | ||
306 | |||
307 | /** Removes bytes from the begining of the input queue. Use this after | ||
308 | * getting the input and processing as much as you need to. | ||
309 | *@param nAmount The number of bytes used. | ||
310 | *@returns true if the update was successful, otherwise false. | ||
311 | */ | ||
312 | bool usedInput( int nAmount ); | ||
313 | |||
314 | /** Sets the protocol to be used by this connection. All data in and out | ||
315 | * passes through the protocol object, which may process that data to | ||
316 | * filter out and process any special messages that may have been | ||
317 | * included. Everything that isn't processed can be accessed in the | ||
318 | * standard method. | ||
319 | *@param pNewProtocol A pointer to a protocol object that you want to | ||
320 | * use. | ||
321 | */ | ||
322 | void setProtocol( class Protocol *pNewProtocol ); | ||
323 | |||
324 | /** Gets the number of bytes that are waiting in the input queue, the data | ||
325 | * that has yet to be processed. | ||
326 | *@returns The number of bytes in the input queue. | ||
327 | */ | ||
328 | int getInputAmnt(); | ||
329 | |||
330 | /** Gets the number of bytes that are waiting in the output queue, the data | ||
331 | * that has yet to be sent to the connected socket. | ||
332 | *@returns The number of bytes in the input queue. | ||
333 | */ | ||
334 | int getOutputAmnt(); | ||
335 | |||
336 | /** Gets a pointer to the protocol that is attatched to this connection | ||
337 | * object. This is useful to set modes, and send special commands in | ||
338 | * addition to the standard raw data reads and writes that are normally | ||
339 | * permitted. In fact, in everything besides a raw telnet protocol all | ||
340 | * data should be sent through the protocol and not the connection object. | ||
341 | *@returns A pointer to the Protocol assosiated with this connection. | ||
342 | */ | ||
343 | class Protocol *getProtocol(); | ||
344 | |||
345 | private: | ||
346 | /** | ||
347 | * A buffer to keep data read from the socket in. This is filled in by | ||
348 | * the function readInput, which is automatically called by the | ||
349 | * ConnectionManager whenever new data is ready. | ||
350 | */ | ||
351 | FlexBuf xInputBuf; | ||
352 | |||
353 | /** | ||
354 | * A buffer to keep data that should be sent to the socket. This is filled | ||
355 | * in by using the AppendOutput functions and is sent to the socket using | ||
356 | * the writeOutput function, which is automatically called every cycle by | ||
357 | * the ConnectionManager when there is pending data. | ||
358 | */ | ||
359 | FlexBuf xOutputBuf; | ||
360 | |||
361 | /** | ||
362 | * The socket that the user is connected to. This is not the same as the | ||
363 | * socket number of the listening socket, this is the unique socket on the | ||
364 | * system that the data is coming to. | ||
365 | */ | ||
366 | int nSocket; | ||
367 | |||
368 | /** | ||
369 | * True=active connection, False=connection lost | ||
370 | */ | ||
371 | bool bActive; | ||
372 | |||
373 | /** | ||
374 | * True=disconnect next cycle (after data is transmitted), Flse=keep going. | ||
375 | */ | ||
376 | bool bDisconnectMe; | ||
377 | |||
378 | /** | ||
379 | * A pointer to a protocol handler that can automatically process the data | ||
380 | * in the buffers. This is optional if you use the connections on your own | ||
381 | * but reccomended if you use this with the rest of the ConnectionManager | ||
382 | * system. | ||
383 | */ | ||
384 | class Protocol *pProtocol; | ||
385 | }; | ||
386 | |||
387 | #endif | ||