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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 GE |
39 | #include "t2n_exception.hxx" |
40 | ||
41 | using namespace std; | |
ac7fdc22 GE |
42 | |
43 | namespace libt2n | |
44 | { | |
45 | ||
94247295 GE |
46 | /** @brief create a new tcp-based server |
47 | @param port tcp port you want to listen on | |
48 | @param ip the local ip you want to listen on. "0.0.0.0" means all local ips (default). | |
49 | */ | |
644c4d26 | 50 | socket_server::socket_server(int port, const std::string& ip) |
a11e19b7 | 51 | : server(), socket_handler(0,tcp_s) |
ac7fdc22 | 52 | { |
cc68aabb GE |
53 | /* Create the socket. */ |
54 | sock = socket (PF_INET, SOCK_STREAM, 0); | |
55 | if (sock < 0) | |
56 | { | |
57 | string err="error opening socket: "; | |
58 | err+=strerror(errno); | |
59 | log(error, err); | |
60 | throw t2n_server_error(err); | |
61 | } | |
62 | ||
63 | set_socket_options(sock); | |
64 | ||
65 | /* Give the socket a name. */ | |
66 | struct sockaddr_in sockaddr; | |
67 | sockaddr.sin_family = AF_INET; | |
68 | sockaddr.sin_port = htons(port); | |
69 | ||
70 | if (inet_aton(ip.c_str(),&sockaddr.sin_addr) == 0) | |
71 | { | |
72 | string err="failed listening on invalid ip "; | |
73 | err+=ip; | |
74 | log(error, err); | |
75 | throw t2n_server_error(err); | |
76 | } | |
77 | ||
78 | if (bind (sock, (struct sockaddr *) &sockaddr, sizeof (sockaddr)) < 0) | |
79 | { | |
80 | string err="error binding socket: "; | |
81 | err+=strerror(errno); | |
82 | log(error, err); | |
83 | throw t2n_server_error(err); | |
84 | } | |
85 | ||
86 | start_listening(); | |
ac7fdc22 GE |
87 | } |
88 | ||
94247295 GE |
89 | /** @brief create a new unix-socked-based server |
90 | @param path path of the socket | |
91 | @param filemode permissions you want to open the socket with | |
92 | @param user local username for the socket | |
93 | @param group local groupname for the socket | |
94 | */ | |
644c4d26 | 95 | socket_server::socket_server(const std::string& path, mode_t filemode, const std::string& user, const std::string& group) |
a11e19b7 | 96 | : server(), socket_handler(0,unix_s) |
ac7fdc22 | 97 | { |
ac7fdc22 GE |
98 | unix_path=path; |
99 | ||
ac7fdc22 | 100 | /* Create the socket. */ |
0cf4dc9b GE |
101 | sock = socket (PF_UNIX, SOCK_STREAM, 0); |
102 | if (sock < 0) | |
ac7fdc22 GE |
103 | { |
104 | string err="error opening socket: "; | |
0cf4dc9b GE |
105 | err+=strerror(errno); |
106 | log(error, err); | |
107 | throw t2n_server_error(err); | |
108 | } | |
109 | ||
110 | set_socket_options(sock); | |
111 | ||
112 | /* Give the socket a name. */ | |
113 | struct sockaddr_un unix_name; | |
114 | unix_name.sun_family = AF_UNIX; | |
115 | strncpy (unix_name.sun_path, unix_path.c_str(),sizeof(unix_name.sun_path)); | |
116 | ||
117 | /* just to make sure there is no other socket file */ | |
118 | unlink (unix_name.sun_path); | |
119 | ||
120 | if (bind (sock, (struct sockaddr *) &unix_name, sizeof (unix_name)) < 0) | |
121 | { | |
122 | string err="error binding socket: "; | |
123 | err+=strerror(errno); | |
124 | log(error, err); | |
125 | throw t2n_server_error(err); | |
126 | } | |
127 | ||
128 | /* change permissions */ | |
129 | if (chmod (unix_name.sun_path, filemode) != 0) | |
130 | { | |
131 | string err="error changing permission: "; | |
132 | err+=strerror(errno); | |
133 | log(error, err); | |
134 | throw t2n_server_error(err); | |
135 | } | |
136 | ||
644c4d26 | 137 | if (!user.empty() && !group.empty()) |
0cf4dc9b | 138 | { |
644c4d26 | 139 | // TODO maybe use current user/group if one of them is empty |
0cf4dc9b | 140 | |
644c4d26 GE |
141 | struct passwd *socket_user = getpwnam (user.c_str()); |
142 | if (socket_user == NULL) | |
143 | { | |
144 | string err="error getting socket user: "; | |
145 | err+=strerror(errno); | |
146 | log(error, err); | |
147 | throw t2n_server_error(err); | |
148 | } | |
149 | ||
150 | struct group *socket_group = getgrnam (group.c_str()); | |
151 | if (socket_group == NULL) | |
152 | { | |
153 | string err="error getting socket group: "; | |
154 | err+=strerror(errno); | |
155 | log(error, err); | |
156 | throw t2n_server_error(err); | |
157 | } | |
158 | ||
159 | if (chown (unix_name.sun_path, socket_user->pw_uid, socket_group->gr_gid) != 0) | |
160 | { | |
161 | string err="error changing socket ownership: "; | |
162 | err+=strerror(errno); | |
163 | log(error, err); | |
164 | throw t2n_server_error(err); | |
165 | } | |
0cf4dc9b GE |
166 | } |
167 | ||
cc68aabb GE |
168 | start_listening(); |
169 | } | |
170 | ||
171 | socket_server::~socket_server() | |
172 | { | |
173 | socket_handler::close(); | |
174 | ||
175 | if (get_type()==unix_s) | |
176 | unlink(unix_path.c_str()); | |
177 | } | |
178 | ||
179 | /// start listening on a new server socket (called by the constructors) | |
180 | void socket_server::start_listening() | |
181 | { | |
0cf4dc9b GE |
182 | if (listen (sock, 5) < 0) |
183 | { | |
184 | string err="error listening to socket: "; | |
185 | err+=strerror(errno); | |
186 | log(error, err); | |
187 | throw t2n_server_error(err); | |
188 | } | |
189 | ||
190 | /* clear & insert server sock into the fd_tab to prepare select */ | |
191 | FD_ZERO(&connection_set); | |
192 | FD_SET (sock, &connection_set); | |
193 | } | |
194 | ||
cc68aabb | 195 | /// handle a new connection from a client |
0cf4dc9b GE |
196 | void socket_server::new_connection() |
197 | { | |
04e6b271 | 198 | struct sockaddr_un clientname; |
ac7fdc22 | 199 | |
04e6b271 GE |
200 | unsigned int size = sizeof (clientname); |
201 | int newsock = accept (sock,(struct sockaddr *) &clientname,&size); | |
202 | if (newsock < 0) | |
203 | { | |
204 | if (errno == EAGAIN) | |
205 | { | |
206 | log(error, "accept error (EAGAIN): no connection waiting"); | |
207 | return; | |
208 | } | |
209 | ||
210 | /* default: break */ | |
211 | string err="error accepting connection: "; | |
212 | err+=strerror(errno); | |
213 | log(error, err); | |
214 | throw t2n_server_error(err); | |
215 | } | |
216 | ||
217 | FD_SET (newsock, &connection_set); | |
218 | ||
a11e19b7 GE |
219 | socket_server_connection *nc=new socket_server_connection(newsock, get_type(), get_default_timeout()); |
220 | nc->set_socket_options(newsock); | |
04e6b271 | 221 | |
a11e19b7 | 222 | add_connection(nc); |
04e6b271 GE |
223 | |
224 | return; | |
0cf4dc9b | 225 | } |
ac7fdc22 | 226 | |
94247295 | 227 | bool socket_server::fill_buffer(long long usec_timeout) |
ac7fdc22 | 228 | { |
0cf4dc9b GE |
229 | fd_set used_fdset=connection_set; |
230 | ||
231 | /* set timeout */ | |
232 | struct timeval tval; | |
233 | struct timeval *timeout_ptr; | |
234 | ||
235 | if (usec_timeout == -1) | |
236 | timeout_ptr = NULL; | |
237 | else | |
238 | { | |
239 | timeout_ptr = &tval; | |
240 | ||
241 | // timeout von long long usec in int sec + int usec umrechnen | |
242 | tval.tv_sec = usec_timeout / 1000000; | |
243 | tval.tv_usec = usec_timeout % 1000000; | |
244 | } | |
245 | ||
246 | int ret=select (FD_SETSIZE, &used_fdset, NULL, NULL, timeout_ptr); | |
247 | ||
248 | if (ret < 0) | |
249 | { | |
250 | if (errno == EINTR) | |
251 | { | |
252 | // select interrupted by signal | |
253 | ret=0; | |
254 | } | |
255 | else | |
256 | { | |
257 | string err="select error: "; | |
258 | err+=strerror(errno); | |
259 | log(error, err); | |
260 | throw t2n_server_error(err); | |
261 | } | |
262 | } | |
263 | ||
264 | if (ret > 0) | |
265 | { | |
266 | // we have data pending | |
267 | ||
268 | // check for new connection | |
269 | if (FD_ISSET (sock, &used_fdset)) | |
270 | { | |
271 | new_connection(); | |
272 | } | |
273 | ||
274 | // check all connections for pending data | |
94247295 | 275 | return fill_connection_buffers(); |
0cf4dc9b | 276 | } |
ac7fdc22 | 277 | |
94247295 | 278 | return false; |
ac7fdc22 GE |
279 | } |
280 | ||
cc68aabb | 281 | /// call fill_buffer() on all connections, called from fill_buffer() |
94247295 | 282 | bool socket_server::fill_connection_buffers() |
aa499d20 | 283 | { |
94247295 GE |
284 | bool data_found; |
285 | ||
a11e19b7 GE |
286 | std::map<unsigned int, server_connection*>::iterator ie=connections.end(); |
287 | for(std::map<unsigned int, server_connection*>::iterator i=connections.begin(); i != ie; i++) | |
644c4d26 | 288 | if (!i->second->server_connection::is_closed()) |
94247295 GE |
289 | if (i->second->fill_buffer(0)) |
290 | data_found=true; | |
291 | ||
292 | return data_found; | |
aa499d20 GE |
293 | } |
294 | ||
cc68aabb | 295 | /// remove the socket of a connection after the connection has been closed |
a11e19b7 | 296 | void socket_server::remove_connection_socket(int sock) |
ac7fdc22 | 297 | { |
a11e19b7 | 298 | FD_CLR(sock, &connection_set); |
ac7fdc22 GE |
299 | } |
300 | ||
644c4d26 GE |
301 | void socket_server_connection::log(log_level_values level, const char* message) |
302 | { | |
303 | if(my_server) | |
304 | { | |
305 | ostringstream msg; | |
306 | msg << "connection id " << get_id() << ": " << message; | |
307 | my_server->log(level,msg.str().c_str()); | |
308 | } | |
309 | } | |
310 | ||
cc68aabb | 311 | /// close this connection. complete data waiting in the buffer can still be retrieved. |
a11e19b7 | 312 | void socket_server_connection::close() |
ac7fdc22 | 313 | { |
644c4d26 | 314 | if (!server_connection::is_closed()) |
aa499d20 | 315 | { |
a11e19b7 GE |
316 | socket_handler::close(); |
317 | server_connection::close(); | |
aa499d20 GE |
318 | } |
319 | ||
a11e19b7 | 320 | if (my_server) |
aa499d20 | 321 | { |
a11e19b7 | 322 | dynamic_cast<socket_server*>(my_server)->remove_connection_socket(sock); |
aa499d20 | 323 | } |
ac7fdc22 GE |
324 | } |
325 | ||
326 | } |