1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd: (C) 2002-2009 InspIRCd Development Team
6 * See: http://wiki.inspircd.org/Credits
8 * This program is free but copyrighted software; see
9 * the file COPYING for details.
11 * ---------------------------------------------------
16 #include "transport.h"
19 /* $ModDesc: Provides zlib link support for servers */
20 /* $LinkerFlags: -lz */
21 /* $ModDep: transport.h */
24 * ZLIB_BEST_COMPRESSION (9) is used for all sending of data with
25 * a flush after each chunk. A frame may contain multiple lines
26 * and should be treated as raw binary data.
29 /* Status of a connection */
30 enum izip_status { IZIP_CLOSED = 0, IZIP_OPEN };
32 /** Represents an zipped connections extra data
34 class izip_session : public classbase
37 z_stream c_stream; /* compression stream */
38 z_stream d_stream; /* uncompress stream */
39 izip_status status; /* Connection status */
40 std::string outbuf; /* Holds output buffer (compressed) */
41 std::string inbuf; /* Holds input buffer (compressed) */
44 class ModuleZLib : public Module
46 izip_session* sessions;
48 /* Used for stats z extensions */
49 float total_out_compressed;
50 float total_in_compressed;
51 float total_out_uncompressed;
52 float total_in_uncompressed;
54 /* Used for reading data from the wire and compressing data to. */
56 unsigned int net_buffer_size;
59 ModuleZLib(InspIRCd* Me)
62 ServerInstance->Modules->PublishInterface("BufferedSocketHook", this);
64 sessions = new izip_session[ServerInstance->SE->GetMaxFds()];
65 for (int i = 0; i < ServerInstance->SE->GetMaxFds(); i++)
66 sessions[i].status = IZIP_CLOSED;
68 total_out_compressed = total_in_compressed = 0;
69 total_out_uncompressed = total_in_uncompressed = 0;
70 Implementation eventlist[] = { I_OnStats, I_OnRequest };
71 ServerInstance->Modules->Attach(eventlist, this, 2);
73 // Allocate a buffer which is used for reading and writing data
74 net_buffer_size = ServerInstance->Config->NetBufferSize;
75 net_buffer = new char[net_buffer_size];
80 ServerInstance->Modules->UnpublishInterface("BufferedSocketHook", this);
87 return Version("Provides zlib link support for servers", VF_VENDOR, API_VERSION);
91 /* Handle BufferedSocketHook API requests */
92 const char* OnRequest(Request* request)
94 ISHRequest* ISR = (ISHRequest*)request;
95 if (strcmp("IS_NAME", request->GetId()) == 0)
100 else if (strcmp("IS_HOOK", request->GetId()) == 0)
102 ISR->Sock->AddIOHook(this);
105 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
107 ISR->Sock->DelIOHook();
110 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
112 /* Check for completion of handshake
113 * (actually, this module doesnt handshake)
117 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
119 /* Attach certificate data to the inspsocket
120 * (this module doesnt do that, either)
127 /* Handle stats z (misc stats) */
128 ModResult OnStats(char symbol, User* user, string_list &results)
132 std::string sn = ServerInstance->Config->ServerName;
134 /* Yeah yeah, i know, floats are ew.
135 * We used them here because we'd be casting to float anyway to do this maths,
136 * and also only floating point numbers can deal with the pretty large numbers
137 * involved in the total throughput of a server over a large period of time.
138 * (we dont count 64 bit ints because not all systems have 64 bit ints, and floats
139 * can still hold more.
141 float outbound_r = (total_out_compressed / (total_out_uncompressed + 0.001)) * 100;
142 float inbound_r = (total_in_compressed / (total_in_uncompressed + 0.001)) * 100;
144 float total_compressed = total_in_compressed + total_out_compressed;
145 float total_uncompressed = total_in_uncompressed + total_out_uncompressed;
147 float total_r = (total_compressed / (total_uncompressed + 0.001)) * 100;
149 char outbound_ratio[MAXBUF], inbound_ratio[MAXBUF], combined_ratio[MAXBUF];
151 sprintf(outbound_ratio, "%3.2f%%", outbound_r);
152 sprintf(inbound_ratio, "%3.2f%%", inbound_r);
153 sprintf(combined_ratio, "%3.2f%%", total_r);
155 results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS outbound_compressed = "+ConvToStr(total_out_compressed));
156 results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS inbound_compressed = "+ConvToStr(total_in_compressed));
157 results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS outbound_uncompressed = "+ConvToStr(total_out_uncompressed));
158 results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS inbound_uncompressed = "+ConvToStr(total_in_uncompressed));
159 results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS percentage_of_original_outbound_traffic = "+outbound_ratio);
160 results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS percentage_of_orignal_inbound_traffic = "+inbound_ratio);
161 results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS total_size_of_original_traffic = "+combined_ratio);
162 return MOD_RES_PASSTHRU;
165 return MOD_RES_PASSTHRU;
168 void OnStreamSocketConnect(StreamSocket* user)
170 OnStreamSocketAccept(user, 0, 0);
173 void OnRawSocketAccept(StreamSocket* user, irc::sockets::sockaddrs*, irc::sockets::sockaddrs*)
175 int fd = user->GetFd();
177 izip_session* session = &sessions[fd];
179 /* Just in case... */
180 session->outbuf.clear();
182 session->c_stream.zalloc = (alloc_func)0;
183 session->c_stream.zfree = (free_func)0;
184 session->c_stream.opaque = (voidpf)0;
186 session->d_stream.zalloc = (alloc_func)0;
187 session->d_stream.zfree = (free_func)0;
188 session->d_stream.opaque = (voidpf)0;
190 /* If we cant call this, well, we're boned. */
191 if (inflateInit(&session->d_stream) != Z_OK)
193 session->status = IZIP_CLOSED;
198 if (deflateInit(&session->c_stream, Z_BEST_COMPRESSION) != Z_OK)
200 inflateEnd(&session->d_stream);
201 session->status = IZIP_CLOSED;
205 /* Just in case, do this last */
206 session->status = IZIP_OPEN;
209 void OnStreamSocketClose(StreamSocket* user)
211 int fd = user->GetFd();
212 CloseSession(&sessions[fd]);
215 int OnStreamSocketRead(StreamSocket* user, std::string& recvq)
217 int fd = user->GetFd();
218 /* Find the sockets session */
219 izip_session* session = &sessions[fd];
221 if (session->status == IZIP_CLOSED)
224 if (session->inbuf.empty())
226 /* Read read_buffer_size bytes at a time to the buffer (usually 2.5k) */
227 int readresult = read(fd, net_buffer, net_buffer_size);
231 if (errno == EINTR || errno == EAGAIN)
237 total_in_compressed += readresult;
239 /* Copy the compressed data into our input buffer */
240 session->inbuf.append(net_buffer, readresult);
243 size_t in_len = session->inbuf.length();
244 char* buffer = ServerInstance->GetReadBuffer();
245 int count = ServerInstance->Config->NetBufferSize;
247 /* Prepare decompression */
248 session->d_stream.next_in = (Bytef *)session->inbuf.c_str();
249 session->d_stream.avail_in = in_len;
251 session->d_stream.next_out = (Bytef*)buffer;
252 /* Last byte is reserved for NULL terminating that beast */
253 session->d_stream.avail_out = count - 1;
255 /* Z_SYNC_FLUSH: Do as much as possible */
256 int ret = inflate(&session->d_stream, Z_SYNC_FLUSH);
257 /* TODO CloseStream() in here at random places */
262 /* This is one of the 'not supposed to happen' things.
263 * Memory corruption, anyone?
265 Error(session, "General Error. This is not supposed to happen :/");
268 Error(session, "Decompression failed, malformed data");
271 Error(session, "Out of memory");
274 /* This one is non-fatal, buffer is just full
275 * (can't happen here).
277 Error(session, "Internal error. This is not supposed to happen.");
280 /* This module *never* generates these :/ */
281 Error(session, "End-of-stream marker received");
286 /* NO WAI! This can't happen. All errors are handled above. */
287 Error(session, "Unknown error");
295 /* Update the inbut buffer */
296 unsigned int input_compressed = in_len - session->d_stream.avail_in;
297 session->inbuf = session->inbuf.substr(input_compressed);
299 /* Update counters (Old size - new size) */
300 unsigned int uncompressed_length = (count - 1) - session->d_stream.avail_out;
301 total_in_uncompressed += uncompressed_length;
303 /* Null-terminate the buffer -- this doesnt harm binary data */
304 recvq.append(buffer, uncompressed_length);
308 int OnStreamSocketWrite(StreamSocket* user, std::string& sendq)
310 int fd = user->GetFd();
311 izip_session* session = &sessions[fd];
313 if(session->status != IZIP_OPEN)
314 /* Seriously, wtf? */
319 /* This loop is really only supposed to run once, but in case 'compr'
320 * is filled up somehow we are prepared to handle this situation.
322 unsigned int offset = 0;
325 /* Prepare compression */
326 session->c_stream.next_in = (Bytef*)sendq.data() + offset;
327 session->c_stream.avail_in = sendq.length() - offset;
329 session->c_stream.next_out = (Bytef*)net_buffer;
330 session->c_stream.avail_out = net_buffer_size;
332 /* Compress the text */
333 ret = deflate(&session->c_stream, Z_SYNC_FLUSH);
334 /* TODO CloseStream() in here at random places */
340 /* This one is non-fatal, buffer is just full
341 * (can't happen here).
343 Error(session, "Internal error. This is not supposed to happen.");
346 /* This is one of the 'not supposed to happen' things.
347 * Memory corruption, anyone?
349 Error(session, "General Error. This is also not supposed to happen.");
352 Error(session, "Unknown error");
359 /* Space before - space after stuff was added to this */
360 unsigned int compressed = net_buffer_size - session->c_stream.avail_out;
361 unsigned int uncompressed = sendq.length() - session->c_stream.avail_in;
363 /* Make it skip the data which was compressed already */
364 offset += uncompressed;
367 total_out_uncompressed += uncompressed;
368 total_out_compressed += compressed;
370 /* Add compressed to the output buffer */
371 session->outbuf.append((const char*)net_buffer, compressed);
372 } while (session->c_stream.avail_in != 0);
374 /* Lets see how much we can send out */
375 ret = write(fd, session->outbuf.data(), session->outbuf.length());
377 /* Check for errors, and advance the buffer if any was sent */
379 session->outbuf = session->outbuf.substr(ret);
386 session->outbuf.clear();
394 void Error(izip_session* session, const std::string &text)
396 ServerInstance->SNO->WriteToSnoMask('l', "ziplink error: " + text);
399 void CloseSession(izip_session* session)
401 if (session->status == IZIP_OPEN)
403 session->status = IZIP_CLOSED;
404 session->outbuf.clear();
405 inflateEnd(&session->d_stream);
406 deflateEnd(&session->c_stream);
412 MODULE_INIT(ModuleZLib)