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ac7fdc22 GE |
1 | /*************************************************************************** |
2 | * Copyright (C) 2006 by Gerd v. Egidy * | |
3 | * gve@intra2net.com * | |
4 | * * | |
5 | * This library is free software; you can redistribute it and/or modify * | |
6 | * it under the terms of the GNU Lesser General Public License version * | |
7 | * 2.1 as published by the Free Software Foundation. * | |
8 | * * | |
9 | * This library is distributed in the hope that it will be useful, * | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | |
12 | * GNU Lesser General Public License for more details. * | |
13 | * * | |
14 | * You should have received a copy of the GNU Lesser General Public * | |
15 | * License along with this program; if not, write to the * | |
16 | * Free Software Foundation, Inc., * | |
17 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * | |
18 | ***************************************************************************/ | |
19 | ||
0cf4dc9b GE |
20 | #include <stdio.h> |
21 | #include <errno.h> | |
22 | #include <stdlib.h> | |
23 | #include <unistd.h> | |
24 | #include <sys/types.h> | |
25 | #include <sys/socket.h> | |
26 | #include <sys/un.h> | |
27 | #include <sys/time.h> | |
28 | #include <arpa/inet.h> | |
29 | #include <netinet/in.h> | |
30 | #include <netdb.h> | |
31 | #include <fcntl.h> | |
32 | #include <time.h> | |
33 | #include <pwd.h> | |
34 | #include <grp.h> | |
35 | ||
aa499d20 GE |
36 | #include <sstream> |
37 | ||
ac7fdc22 | 38 | #include "socket_server.hxx" |
0cf4dc9b | 39 | #include "t2n_exception.hxx" |
a7170401 | 40 | #include "log.hxx" |
0cf4dc9b GE |
41 | |
42 | using namespace std; | |
ac7fdc22 GE |
43 | |
44 | namespace libt2n | |
45 | { | |
46 | ||
94247295 GE |
47 | /** @brief create a new tcp-based server |
48 | @param port tcp port you want to listen on | |
49 | @param ip the local ip you want to listen on. "0.0.0.0" means all local ips (default). | |
50 | */ | |
644c4d26 | 51 | socket_server::socket_server(int port, const std::string& ip) |
a11e19b7 | 52 | : server(), socket_handler(0,tcp_s) |
ac7fdc22 | 53 | { |
cc68aabb GE |
54 | /* Create the socket. */ |
55 | sock = socket (PF_INET, SOCK_STREAM, 0); | |
56 | if (sock < 0) | |
a7170401 | 57 | EXCEPTIONSTREAM(error,t2n_server_error,"error opening socket: " << strerror(errno)); |
cc68aabb GE |
58 | |
59 | set_socket_options(sock); | |
60 | ||
61 | /* Give the socket a name. */ | |
62 | struct sockaddr_in sockaddr; | |
63 | sockaddr.sin_family = AF_INET; | |
64 | sockaddr.sin_port = htons(port); | |
65 | ||
66 | if (inet_aton(ip.c_str(),&sockaddr.sin_addr) == 0) | |
a7170401 | 67 | EXCEPTIONSTREAM(error,t2n_server_error,"failed listening on invalid ip " << ip); |
cc68aabb GE |
68 | |
69 | if (bind (sock, (struct sockaddr *) &sockaddr, sizeof (sockaddr)) < 0) | |
238ad35f TJ |
70 | { |
71 | // FIXME: Calls virtual function socket_server::get_logstream() in constructor | |
a7170401 | 72 | EXCEPTIONSTREAM(error,t2n_server_error,"error binding socket: " << strerror(errno)); |
238ad35f | 73 | } |
cc68aabb GE |
74 | |
75 | start_listening(); | |
ac7fdc22 GE |
76 | } |
77 | ||
94247295 GE |
78 | /** @brief create a new unix-socked-based server |
79 | @param path path of the socket | |
80 | @param filemode permissions you want to open the socket with | |
81 | @param user local username for the socket | |
82 | @param group local groupname for the socket | |
83 | */ | |
644c4d26 | 84 | socket_server::socket_server(const std::string& path, mode_t filemode, const std::string& user, const std::string& group) |
a11e19b7 | 85 | : server(), socket_handler(0,unix_s) |
ac7fdc22 | 86 | { |
ac7fdc22 GE |
87 | unix_path=path; |
88 | ||
238ad35f TJ |
89 | // TODO: Every EXCEPTIONSTREAM in here calls virtual function get_logstream() |
90 | ||
ac7fdc22 | 91 | /* Create the socket. */ |
0cf4dc9b GE |
92 | sock = socket (PF_UNIX, SOCK_STREAM, 0); |
93 | if (sock < 0) | |
a7170401 | 94 | EXCEPTIONSTREAM(error,t2n_server_error,"error opening socket: " << strerror(errno)); |
0cf4dc9b GE |
95 | |
96 | set_socket_options(sock); | |
97 | ||
98 | /* Give the socket a name. */ | |
99 | struct sockaddr_un unix_name; | |
100 | unix_name.sun_family = AF_UNIX; | |
101 | strncpy (unix_name.sun_path, unix_path.c_str(),sizeof(unix_name.sun_path)); | |
102 | ||
103 | /* just to make sure there is no other socket file */ | |
104 | unlink (unix_name.sun_path); | |
105 | ||
106 | if (bind (sock, (struct sockaddr *) &unix_name, sizeof (unix_name)) < 0) | |
a7170401 | 107 | EXCEPTIONSTREAM(error,t2n_server_error,"error binding socket: " << strerror(errno)); |
0cf4dc9b GE |
108 | |
109 | /* change permissions */ | |
110 | if (chmod (unix_name.sun_path, filemode) != 0) | |
a7170401 | 111 | EXCEPTIONSTREAM(error,t2n_server_error,"error changing permission: " << strerror(errno)); |
0cf4dc9b | 112 | |
644c4d26 | 113 | if (!user.empty() && !group.empty()) |
0cf4dc9b | 114 | { |
644c4d26 | 115 | // TODO maybe use current user/group if one of them is empty |
0cf4dc9b | 116 | |
644c4d26 GE |
117 | struct passwd *socket_user = getpwnam (user.c_str()); |
118 | if (socket_user == NULL) | |
a7170401 GE |
119 | EXCEPTIONSTREAM(error,t2n_server_error,"error getting socket user: " << strerror(errno)); |
120 | ||
644c4d26 GE |
121 | struct group *socket_group = getgrnam (group.c_str()); |
122 | if (socket_group == NULL) | |
a7170401 GE |
123 | EXCEPTIONSTREAM(error,t2n_server_error,"error getting socket group: " << strerror(errno)); |
124 | ||
644c4d26 | 125 | if (chown (unix_name.sun_path, socket_user->pw_uid, socket_group->gr_gid) != 0) |
a7170401 | 126 | EXCEPTIONSTREAM(error,t2n_server_error,"error changing socket ownership: " << strerror(errno)); |
0cf4dc9b GE |
127 | } |
128 | ||
cc68aabb GE |
129 | start_listening(); |
130 | } | |
131 | ||
56f3994d TJ |
132 | /** |
133 | * Destructor | |
134 | */ | |
cc68aabb GE |
135 | socket_server::~socket_server() |
136 | { | |
56f3994d TJ |
137 | // close all client connections |
138 | server::close(); | |
139 | ||
140 | // server socket will be closed by destructor of socket_handler | |
cc68aabb GE |
141 | |
142 | if (get_type()==unix_s) | |
143 | unlink(unix_path.c_str()); | |
56f3994d TJ |
144 | |
145 | // disconnect connection<->server pointer | |
146 | std::map<unsigned int, server_connection*>::iterator it, it_end = connections.end(); | |
147 | for (it = connections.begin(); it != it_end; ++it) | |
148 | { | |
149 | socket_server_connection *conn = dynamic_cast<socket_server_connection*>(it->second); | |
150 | if (conn) | |
151 | conn->my_server = NULL; | |
152 | } | |
cc68aabb GE |
153 | } |
154 | ||
155 | /// start listening on a new server socket (called by the constructors) | |
156 | void socket_server::start_listening() | |
157 | { | |
0cf4dc9b | 158 | if (listen (sock, 5) < 0) |
a7170401 | 159 | EXCEPTIONSTREAM(error,t2n_server_error,"error listening to socket: " << strerror(errno)); |
0cf4dc9b GE |
160 | |
161 | /* clear & insert server sock into the fd_tab to prepare select */ | |
162 | FD_ZERO(&connection_set); | |
163 | FD_SET (sock, &connection_set); | |
164 | } | |
165 | ||
cc68aabb | 166 | /// handle a new connection from a client |
0cf4dc9b GE |
167 | void socket_server::new_connection() |
168 | { | |
04e6b271 | 169 | struct sockaddr_un clientname; |
ac7fdc22 | 170 | |
04e6b271 GE |
171 | unsigned int size = sizeof (clientname); |
172 | int newsock = accept (sock,(struct sockaddr *) &clientname,&size); | |
173 | if (newsock < 0) | |
174 | { | |
c7857475 GE |
175 | // return on non-fatal errors (list taken from man-page) |
176 | if (errno == EAGAIN || errno == EWOULDBLOCK || errno == ECONNABORTED || errno == EINTR || | |
177 | errno == EMFILE || errno == ENFILE || errno == ENOBUFS || errno == ENOMEM || | |
178 | errno == EPROTO || errno == EPERM || errno == ETIMEDOUT) | |
04e6b271 | 179 | { |
c7857475 | 180 | LOGSTREAM(error,"non-fatal accept error: " << strerror(errno)); |
04e6b271 GE |
181 | return; |
182 | } | |
183 | ||
c7857475 GE |
184 | /* fatal error: will usually kill or restart the server */ |
185 | EXCEPTIONSTREAM(error,t2n_server_error,"fatal error accepting connection: " << strerror(errno)); | |
04e6b271 GE |
186 | } |
187 | ||
188 | FD_SET (newsock, &connection_set); | |
189 | ||
a11e19b7 GE |
190 | socket_server_connection *nc=new socket_server_connection(newsock, get_type(), get_default_timeout()); |
191 | nc->set_socket_options(newsock); | |
04e6b271 | 192 | |
a11e19b7 | 193 | add_connection(nc); |
04e6b271 GE |
194 | |
195 | return; | |
0cf4dc9b | 196 | } |
ac7fdc22 | 197 | |
45a2ebc9 GE |
198 | /** @brief look for new connections and new data in any of the existing connections |
199 | @param usec_timeout wait until new data is found, max timeout usecs. | |
200 | -1: wait endless | |
201 | 0: return instantly | |
202 | @param usec_timeout_remaining if non-NULL the function will write the | |
203 | not used time to the given target | |
204 | @retval true if new data was found (does not mean that the received data | |
205 | is a complete packet though) | |
206 | */ | |
207 | bool socket_server::fill_buffer(long long usec_timeout,long long* usec_timeout_remaining) | |
ac7fdc22 | 208 | { |
0cf4dc9b GE |
209 | fd_set used_fdset=connection_set; |
210 | ||
211 | /* set timeout */ | |
212 | struct timeval tval; | |
213 | struct timeval *timeout_ptr; | |
214 | ||
215 | if (usec_timeout == -1) | |
216 | timeout_ptr = NULL; | |
217 | else | |
218 | { | |
219 | timeout_ptr = &tval; | |
220 | ||
221 | // timeout von long long usec in int sec + int usec umrechnen | |
222 | tval.tv_sec = usec_timeout / 1000000; | |
223 | tval.tv_usec = usec_timeout % 1000000; | |
224 | } | |
225 | ||
226 | int ret=select (FD_SETSIZE, &used_fdset, NULL, NULL, timeout_ptr); | |
227 | ||
45a2ebc9 GE |
228 | // return the timeout we did not use |
229 | if (usec_timeout > 0 && usec_timeout_remaining != NULL) | |
230 | *usec_timeout_remaining=(tval.tv_sec*1000000)+tval.tv_usec; | |
231 | ||
0cf4dc9b GE |
232 | if (ret < 0) |
233 | { | |
234 | if (errno == EINTR) | |
235 | { | |
236 | // select interrupted by signal | |
237 | ret=0; | |
238 | } | |
239 | else | |
a7170401 | 240 | EXCEPTIONSTREAM(error,t2n_server_error,"select error: " << strerror(errno)); |
0cf4dc9b GE |
241 | } |
242 | ||
243 | if (ret > 0) | |
244 | { | |
245 | // we have data pending | |
246 | ||
247 | // check for new connection | |
248 | if (FD_ISSET (sock, &used_fdset)) | |
249 | { | |
250 | new_connection(); | |
251 | } | |
252 | ||
253 | // check all connections for pending data | |
94247295 | 254 | return fill_connection_buffers(); |
0cf4dc9b | 255 | } |
ac7fdc22 | 256 | |
94247295 | 257 | return false; |
ac7fdc22 GE |
258 | } |
259 | ||
cc68aabb | 260 | /// call fill_buffer() on all connections, called from fill_buffer() |
94247295 | 261 | bool socket_server::fill_connection_buffers() |
aa499d20 | 262 | { |
20a05ab7 | 263 | bool data_found = false; |
94247295 | 264 | |
a11e19b7 GE |
265 | std::map<unsigned int, server_connection*>::iterator ie=connections.end(); |
266 | for(std::map<unsigned int, server_connection*>::iterator i=connections.begin(); i != ie; i++) | |
644c4d26 | 267 | if (!i->second->server_connection::is_closed()) |
c7857475 GE |
268 | { |
269 | // shutdown all connections which throw exceptions to protect the server | |
270 | try | |
271 | { | |
272 | if (i->second->fill_buffer(0)) | |
273 | data_found=true; | |
274 | } | |
275 | catch (t2n_transfer_error &e) | |
276 | { i->second->close(); } | |
277 | catch(...) | |
278 | { throw; } | |
279 | } | |
94247295 GE |
280 | |
281 | return data_found; | |
aa499d20 GE |
282 | } |
283 | ||
cc68aabb | 284 | /// remove the socket of a connection after the connection has been closed |
a11e19b7 | 285 | void socket_server::remove_connection_socket(int sock) |
ac7fdc22 | 286 | { |
a11e19b7 | 287 | FD_CLR(sock, &connection_set); |
ac7fdc22 GE |
288 | } |
289 | ||
56f3994d TJ |
290 | /** |
291 | * Destructor | |
292 | */ | |
293 | socket_server_connection::~socket_server_connection() | |
294 | { | |
295 | // Only notify parent server about going down. | |
296 | // The real socket will be closed by the destructor of the base classes. | |
297 | if (my_server && sock != -1) | |
298 | { | |
299 | socket_server *srv = dynamic_cast<socket_server*>(my_server); | |
300 | if (srv) | |
301 | srv->remove_connection_socket(sock); | |
302 | } | |
303 | } | |
304 | ||
cc68aabb | 305 | /// close this connection. complete data waiting in the buffer can still be retrieved. |
a11e19b7 | 306 | void socket_server_connection::close() |
ac7fdc22 | 307 | { |
56f3994d | 308 | if (my_server && sock != -1) |
aa499d20 | 309 | { |
56f3994d TJ |
310 | socket_server *srv = dynamic_cast<socket_server*>(my_server); |
311 | if (srv) | |
312 | srv->remove_connection_socket(sock); | |
aa499d20 GE |
313 | } |
314 | ||
56f3994d | 315 | if (!server_connection::is_closed()) |
aa499d20 | 316 | { |
56f3994d TJ |
317 | socket_handler::close(); |
318 | server_connection::close(); | |
aa499d20 | 319 | } |
ac7fdc22 GE |
320 | } |
321 | ||
322 | } |