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5c8a3d40 RP |
1 | /** @file |
2 | * | |
3 | * (c) Copyright 2008 by Intra2net AG | |
4 | * | |
5 | * info@intra2net.com | |
6 | * | |
7 | * @todo unlink unix server socket on close. | |
8 | */ | |
9 | ||
42b7c46d | 10 | #include "async_socket.hpp" |
5c8a3d40 RP |
11 | #include <sys/types.h> |
12 | #include <sys/stat.h> | |
13 | #include <sys/socket.h> | |
14 | #include <errno.h> | |
15 | #include <sys/un.h> | |
16 | #include <netinet/in.h> | |
17 | #include <limits.h> | |
18 | #include <filefunc.hxx> | |
19 | ||
20 | ||
42b7c46d | 21 | namespace AsyncIo |
5c8a3d40 RP |
22 | { |
23 | ||
24 | ||
25 | namespace | |
26 | { | |
27 | ||
28 | struct sockaddr_un dummy_un; | |
29 | ||
30 | union MegaAddr { | |
31 | struct sockaddr m_addr; | |
32 | struct sockaddr_in m_addr_in; | |
33 | struct sockaddr_un m_addr_un; // NOTE (historically) too small... | |
34 | // storage is large enough to hold all sockaddr_* variants with the (historical) exception of _un ! | |
35 | struct sockaddr_storage m_addr_store; | |
36 | // a char array large enough to hold _un (with an path up to the maximum allowed size!) | |
37 | // (the +1 is added for a later 0-termination of the path) | |
38 | char m_buffer[ sizeof(dummy_un) - sizeof(dummy_un.sun_path) + PATH_MAX + 1 ]; | |
39 | }; | |
40 | ||
41 | ||
42 | } // eo namespace <anonymous> | |
43 | ||
44 | ||
45 | ||
46 | /* | |
47 | ** implementation of ServerSocketBaseImplementation | |
48 | */ | |
49 | ||
50 | ||
51 | ServerSocketBaseImplementation::ServerSocketBaseImplementation() | |
52 | : IOImplementation() | |
53 | { | |
54 | } // eo ServerSocketBaseImplementation::ServerSocketBaseImplementation() | |
55 | ||
56 | ||
57 | /** | |
58 | * @brief handled incoming connections on the server port. | |
59 | * | |
60 | * accepts the new connection, stores the peer address in an internal buffer | |
61 | * and calls a (derived) acceptNewConnection method to create an apropriate | |
62 | * IO class instance. | |
63 | * If no io instance is created the connection is closed. | |
64 | */ | |
65 | void ServerSocketBaseImplementation::doRead() | |
66 | { | |
67 | MegaAddr addr; | |
68 | socklen_t addrlen = sizeof(addr); | |
69 | ||
70 | // reset errno: | |
71 | m_errno= 0; | |
72 | ||
73 | // reset the mark: | |
74 | resetReadMark(); | |
75 | ||
76 | int fd = ::accept( readFd(), &addr.m_addr, &addrlen); | |
77 | if (fd < 0) | |
78 | { | |
79 | // handle errors. | |
80 | m_errno= errno; | |
81 | switch (m_errno) | |
82 | { | |
83 | case EBADF: | |
84 | case EINVAL: | |
85 | case ENOTSOCK: | |
86 | // should not happen... | |
87 | close(); | |
88 | break; | |
89 | default:; | |
90 | } | |
91 | return; | |
92 | } | |
93 | ||
94 | if (addrlen < sizeof(addr)) | |
95 | { | |
96 | // in case of unix domain socket: terminate the path! | |
97 | // NOTE we are doing this here since we don't pass the length info. | |
98 | addr.m_buffer[addrlen]= 0; | |
99 | } | |
100 | else | |
101 | { | |
102 | //something went terribly wrong!! | |
103 | // the resulting address structure is larger than it ever could be... | |
104 | ::close(fd); | |
105 | return; | |
106 | } | |
107 | ||
108 | IOImplementationPtr connection= acceptNewConnection(fd, &addr.m_addr); | |
109 | if(!connection) | |
110 | { | |
111 | ::close(fd); | |
112 | return; | |
113 | } | |
114 | if (m_new_connection_base_callback) | |
115 | { | |
116 | m_new_connection_base_callback(connection); | |
117 | } | |
118 | } // eo ServerSocketBaseImplementation::doRead() | |
119 | ||
120 | ||
121 | /** | |
122 | * @brief handles write events. | |
123 | * | |
124 | * since server sockets never ever get a write mark, something must | |
125 | * be wrong and the connection is closed! | |
126 | */ | |
127 | void ServerSocketBaseImplementation::doWrite() | |
128 | { | |
129 | // if this method is called, something went wrong... | |
130 | close(); | |
131 | //TODO throw something?! | |
132 | } // eo ServerSocketBaseImplementation::doWrite() | |
133 | ||
134 | ||
135 | ||
136 | /** | |
137 | * @brief sets a function which is called when a new connection was established. | |
138 | * | |
139 | * The function gets a (shared) pointer to the new connetion as parameter and is | |
140 | * expected to store it when it accepts the connection. | |
141 | * (Else the conenction gets deleted after the function was called.) | |
142 | * | |
143 | * @param func the function which hsould be called on new conenctions. | |
144 | */ | |
145 | void ServerSocketBaseImplementation::setNewConnectionBaseCallback( | |
146 | const NewConnectionBaseCallbackFunc& func) | |
147 | { | |
148 | m_new_connection_base_callback= func; | |
149 | } // eo ServerSocketBaseImplementation::setNewConnectionBaseCallback(NewConnectionBaseCallbackFunc&) | |
150 | ||
151 | ||
152 | ||
153 | /** | |
154 | * @brief callback for new connections. | |
155 | * | |
156 | * The base method always returns an empty pointer. | |
157 | * | |
158 | * Derived classes must override this method and do something useful with | |
159 | * the passed file descriptor. | |
160 | * | |
161 | * @param fd the file descriptor of the new connection. | |
162 | * @param addr pointer to the address structure filled from ::accept() | |
163 | * @return shared pointer to the new IO class instance (; empty if not accepted) | |
164 | */ | |
165 | IOImplementationPtr ServerSocketBaseImplementation::acceptNewConnection( | |
166 | int fd, boost::any addr) | |
167 | { | |
168 | // needs to be defined in derived class! | |
169 | return IOImplementationPtr(); | |
170 | } // eo ServerSocketBaseImplementation::acceptNewConnection(int,boost::any) | |
171 | ||
172 | ||
173 | ||
174 | /* | |
175 | ** implementation of UnixIOSocket | |
176 | */ | |
177 | ||
178 | ||
179 | UnixIOSocket::UnixIOSocket() | |
9f5d794e TJ |
180 | : m_peer_pid(0) |
181 | , m_peer_uid(0) | |
182 | , m_peer_gid(0) | |
5c8a3d40 RP |
183 | { |
184 | } // eo UnixIOSocket::UnixIOSocket() | |
185 | ||
186 | ||
187 | ||
188 | UnixIOSocket::UnixIOSocket(const std::string& path) | |
189 | : m_peer_pid(0) | |
190 | , m_peer_uid(0) | |
191 | , m_peer_gid(0) | |
192 | { | |
193 | open(path); | |
194 | } // eo UnixIOSocket::UnixIOSocket(const std::string&) | |
195 | ||
196 | ||
197 | UnixIOSocket::UnixIOSocket( | |
198 | int fd, const std::string& path, | |
199 | unsigned int peer_pid, unsigned int peer_uid, unsigned int peer_gid) | |
200 | : IOImplementation(fd,fd) | |
201 | , m_path(path) | |
202 | , m_peer_pid(peer_pid) | |
203 | , m_peer_uid(peer_uid) | |
204 | , m_peer_gid(peer_gid) | |
205 | { | |
206 | } // eo UnixIOSocket::UnixIOSocket(int,const std::string&,unsigned,unsigned,unsigned) | |
207 | ||
208 | ||
209 | /** | |
210 | * @brief opens a (client) connection to an unix domain socket. | |
211 | * | |
212 | * @param path the path the server is listening on. | |
213 | * @return @a true iff the connection was successfully opened. | |
214 | */ | |
215 | bool UnixIOSocket::open(const std::string& path) | |
216 | { | |
217 | if (opened()) close(); | |
218 | ||
219 | m_errno= 0; | |
220 | m_path.clear(); | |
221 | ||
222 | if (path.empty() || path.size() >= PATH_MAX) | |
223 | { | |
224 | return false; | |
225 | } | |
226 | ||
227 | int fd= ::socket(PF_UNIX, SOCK_STREAM, 0); | |
228 | if (fd<0) | |
229 | { | |
230 | m_errno= errno; | |
231 | return false; | |
232 | } | |
233 | ||
234 | { | |
235 | MegaAddr addr; | |
236 | addr.m_addr_un.sun_family= AF_UNIX; | |
237 | strncpy(addr.m_addr_un.sun_path, path.c_str(), PATH_MAX); | |
238 | if (::connect(fd,(sockaddr*)&addr.m_addr_un, SUN_LEN(&addr.m_addr_un)) < 0) | |
239 | { | |
240 | m_errno= errno; | |
241 | ::close(fd); | |
242 | return false; | |
243 | } | |
244 | } | |
245 | m_path= path; | |
246 | setReadFd(fd); | |
247 | setWriteFd(fd); | |
248 | return true; | |
249 | } // eo UnixIOSocket::open(const std::string&,int) | |
250 | ||
251 | ||
252 | /* | |
253 | ** implementation of UnixServerSocketBase | |
254 | */ | |
255 | ||
256 | ||
257 | UnixServerSocketBase::UnixServerSocketBase() | |
258 | { | |
259 | } // eo UnixServerSocketBase::UnixServerSocketBase | |
260 | ||
261 | ||
262 | UnixServerSocketBase::UnixServerSocketBase(const std::string& path, int mode) | |
263 | { | |
264 | open(path,mode); | |
265 | } // eo UnixServerSocketBase::UnixServerSocketBase(const std::string&,int) | |
266 | ||
267 | ||
268 | /** | |
269 | * @brief opens the server part of an unix domain socket. | |
270 | * | |
271 | * @param path the path the new port should listen on. | |
272 | * @param mode the mode for the path. | |
273 | * @return @a true iff the port was successfully opened. | |
274 | */ | |
275 | bool UnixServerSocketBase::open(const std::string& path, int mode) | |
276 | { | |
277 | if (opened()) close(); | |
278 | m_errno= 0; | |
279 | if (path.empty() || path.size() >= PATH_MAX) | |
280 | { | |
281 | return false; | |
282 | } | |
283 | ||
284 | int fd= ::socket(PF_UNIX, SOCK_STREAM, 0); | |
285 | if (fd<0) | |
286 | { | |
287 | m_errno= errno; | |
288 | return false; | |
289 | } | |
290 | ||
291 | { | |
292 | MegaAddr addr; | |
293 | addr.m_addr_un.sun_family= AF_UNIX; | |
294 | strncpy(addr.m_addr_un.sun_path, path.c_str(), PATH_MAX); | |
295 | ::I2n::unlink(path); // just in case... | |
296 | mode_t old_mask= ::umask( (mode & 0777) ^ 0777); | |
297 | if (::bind(fd,(sockaddr*)&addr.m_addr_un, SUN_LEN(&addr.m_addr_un)) < 0) | |
298 | { | |
299 | m_errno= errno; | |
300 | ::umask(old_mask); | |
301 | ::close(fd); | |
302 | return false; | |
303 | } | |
304 | ::umask(old_mask); | |
305 | } | |
306 | m_path= path; | |
307 | ||
308 | { | |
309 | int res= ::listen(fd,8); | |
310 | if (res < 0) | |
311 | { | |
312 | m_errno= errno; | |
313 | ::close(fd); | |
314 | return false; | |
315 | } | |
316 | } | |
317 | setReadFd(fd); | |
318 | return true; | |
319 | } // eo UnixServerSocketBase::open(const std::string&,int) | |
320 | ||
321 | ||
322 | /** | |
323 | * @brief called from base class to create a new connection instance. | |
324 | * | |
325 | * This method accepts only connections to unix domain sockets. | |
326 | * It also tries to determine the peer pid, uid and gid. | |
327 | * | |
328 | * @param fd the file descriptor of a freshly accepted connection. | |
329 | * @param addr conatins "pointer to struct sockaddr" | |
330 | * @return @a a (shared) pointer to the new connection isntance; empty if none was | |
331 | * created. | |
332 | */ | |
333 | IOImplementationPtr UnixServerSocketBase::acceptNewConnection(int fd, boost::any addr) | |
334 | { | |
335 | struct sockaddr *addr_ptr= NULL; | |
336 | try { | |
337 | addr_ptr = boost::any_cast<struct sockaddr*>(addr); | |
338 | } | |
339 | catch (boost::bad_any_cast&) | |
340 | { | |
341 | return IOImplementationPtr(); | |
342 | } | |
343 | // check for the right family: | |
344 | if (addr_ptr->sa_family != AF_UNIX) | |
345 | { | |
346 | return IOImplementationPtr(); | |
347 | } | |
348 | struct sockaddr_un *un_ptr = reinterpret_cast<struct sockaddr_un*>(addr_ptr); | |
349 | std::string peer_path( un_ptr->sun_path ); | |
350 | unsigned peer_pid=0; | |
351 | unsigned peer_gid=0; | |
352 | unsigned peer_uid=0; | |
353 | #ifdef __linux__ | |
354 | { // the linux way to get peer info (pid,gid,uid): | |
355 | struct ucred cred; | |
356 | socklen_t cred_len = sizeof(cred); | |
357 | if (getsockopt(fd,SOL_SOCKET,SO_PEERCRED,&cred,&cred_len) == 0) | |
358 | { | |
359 | peer_pid= cred.pid; | |
360 | peer_uid= cred.uid; | |
361 | peer_gid= cred.gid; | |
362 | } | |
363 | } | |
364 | #else | |
365 | #error dont know how to determine peer info. | |
366 | #endif | |
367 | ||
368 | UnixIOSocketPtr ptr( createIOSocket(fd, peer_path, peer_pid, peer_uid, peer_gid) ); | |
369 | return ptr; | |
370 | } // eo UnixServerSocketBase::acceptNewConnection(int,boost::any); | |
371 | ||
372 | ||
373 | /** | |
374 | * @brief "real" creator of the connection instance. | |
375 | * | |
376 | * called by UnixServerSocketBase::acceptNewConnection to create the new io instance. | |
377 | * | |
378 | * @param fd file descriptor for the socket | |
379 | * @param path path as delivered by peer. | |
380 | * @param peer_pid peer pid. | |
381 | * @param peer_uid peer uid. | |
382 | * @param peer_gid peer gid. | |
383 | * @return (shared) pointer to the new io instance. | |
384 | */ | |
385 | UnixIOSocketPtr UnixServerSocketBase::createIOSocket( | |
386 | int fd, const std::string& path, | |
387 | unsigned int peer_pid, | |
388 | unsigned int peer_uid, unsigned int peer_gid) | |
389 | { | |
390 | return UnixIOSocketPtr( | |
391 | new UnixIOSocket(fd, path, peer_pid, peer_uid, peer_gid) | |
392 | ); | |
393 | } // eo UnixServerSocketBase::createIOSocket(int,const std::string&,unsigned,unsigned,unsigned) | |
394 | ||
395 | ||
396 | ||
42b7c46d | 397 | }// eo namespace AsyncIo |