Commit | Line | Data |
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19facd85 TJ |
1 | /* |
2 | Copyright (C) 2006 by Intra2net AG - Gerd v. Egidy | |
3 | ||
4 | The software in this package is distributed under the GNU General | |
5 | Public License version 2 (with a special exception described below). | |
6 | ||
7 | A copy of GNU General Public License (GPL) is included in this distribution, | |
8 | in the file COPYING.GPL. | |
9 | ||
10 | As a special exception, if other files instantiate templates or use macros | |
11 | or inline functions from this file, or you compile this file and link it | |
12 | with other works to produce a work based on this file, this file | |
13 | does not by itself cause the resulting work to be covered | |
14 | by the GNU General Public License. | |
15 | ||
16 | However the source code for this file must still be made available | |
17 | in accordance with section (3) of the GNU General Public License. | |
18 | ||
19 | This exception does not invalidate any other reasons why a work based | |
20 | on this file might be covered by the GNU General Public License. | |
21 | */ | |
ac7fdc22 | 22 | |
0cf4dc9b GE |
23 | #include <stdio.h> |
24 | #include <errno.h> | |
25 | #include <stdlib.h> | |
26 | #include <unistd.h> | |
27 | #include <sys/types.h> | |
28 | #include <sys/socket.h> | |
29 | #include <sys/un.h> | |
30 | #include <sys/time.h> | |
31 | #include <arpa/inet.h> | |
32 | #include <netinet/in.h> | |
33 | #include <netdb.h> | |
34 | #include <fcntl.h> | |
35 | #include <time.h> | |
36 | #include <pwd.h> | |
37 | #include <grp.h> | |
38 | ||
aa499d20 GE |
39 | #include <sstream> |
40 | ||
ac7fdc22 | 41 | #include "socket_server.hxx" |
0cf4dc9b | 42 | #include "t2n_exception.hxx" |
a7170401 | 43 | #include "log.hxx" |
0cf4dc9b GE |
44 | |
45 | using namespace std; | |
ac7fdc22 GE |
46 | |
47 | namespace libt2n | |
48 | { | |
49 | ||
94247295 GE |
50 | /** @brief create a new tcp-based server |
51 | @param port tcp port you want to listen on | |
52 | @param ip the local ip you want to listen on. "0.0.0.0" means all local ips (default). | |
53 | */ | |
644c4d26 | 54 | socket_server::socket_server(int port, const std::string& ip) |
a11e19b7 | 55 | : server(), socket_handler(0,tcp_s) |
ac7fdc22 | 56 | { |
cc68aabb GE |
57 | /* Create the socket. */ |
58 | sock = socket (PF_INET, SOCK_STREAM, 0); | |
59 | if (sock < 0) | |
a7170401 | 60 | EXCEPTIONSTREAM(error,t2n_server_error,"error opening socket: " << strerror(errno)); |
cc68aabb GE |
61 | |
62 | set_socket_options(sock); | |
63 | ||
64 | /* Give the socket a name. */ | |
65 | struct sockaddr_in sockaddr; | |
66 | sockaddr.sin_family = AF_INET; | |
67 | sockaddr.sin_port = htons(port); | |
68 | ||
69 | if (inet_aton(ip.c_str(),&sockaddr.sin_addr) == 0) | |
a7170401 | 70 | EXCEPTIONSTREAM(error,t2n_server_error,"failed listening on invalid ip " << ip); |
cc68aabb GE |
71 | |
72 | if (bind (sock, (struct sockaddr *) &sockaddr, sizeof (sockaddr)) < 0) | |
238ad35f TJ |
73 | { |
74 | // FIXME: Calls virtual function socket_server::get_logstream() in constructor | |
a7170401 | 75 | EXCEPTIONSTREAM(error,t2n_server_error,"error binding socket: " << strerror(errno)); |
238ad35f | 76 | } |
cc68aabb GE |
77 | |
78 | start_listening(); | |
ac7fdc22 GE |
79 | } |
80 | ||
94247295 GE |
81 | /** @brief create a new unix-socked-based server |
82 | @param path path of the socket | |
83 | @param filemode permissions you want to open the socket with | |
84 | @param user local username for the socket | |
85 | @param group local groupname for the socket | |
86 | */ | |
644c4d26 | 87 | socket_server::socket_server(const std::string& path, mode_t filemode, const std::string& user, const std::string& group) |
a11e19b7 | 88 | : server(), socket_handler(0,unix_s) |
ac7fdc22 | 89 | { |
ac7fdc22 GE |
90 | unix_path=path; |
91 | ||
238ad35f TJ |
92 | // TODO: Every EXCEPTIONSTREAM in here calls virtual function get_logstream() |
93 | ||
ac7fdc22 | 94 | /* Create the socket. */ |
0cf4dc9b GE |
95 | sock = socket (PF_UNIX, SOCK_STREAM, 0); |
96 | if (sock < 0) | |
a7170401 | 97 | EXCEPTIONSTREAM(error,t2n_server_error,"error opening socket: " << strerror(errno)); |
0cf4dc9b GE |
98 | |
99 | set_socket_options(sock); | |
100 | ||
101 | /* Give the socket a name. */ | |
102 | struct sockaddr_un unix_name; | |
103 | unix_name.sun_family = AF_UNIX; | |
104 | strncpy (unix_name.sun_path, unix_path.c_str(),sizeof(unix_name.sun_path)); | |
105 | ||
106 | /* just to make sure there is no other socket file */ | |
107 | unlink (unix_name.sun_path); | |
108 | ||
109 | if (bind (sock, (struct sockaddr *) &unix_name, sizeof (unix_name)) < 0) | |
a7170401 | 110 | EXCEPTIONSTREAM(error,t2n_server_error,"error binding socket: " << strerror(errno)); |
0cf4dc9b GE |
111 | |
112 | /* change permissions */ | |
113 | if (chmod (unix_name.sun_path, filemode) != 0) | |
a7170401 | 114 | EXCEPTIONSTREAM(error,t2n_server_error,"error changing permission: " << strerror(errno)); |
0cf4dc9b | 115 | |
644c4d26 | 116 | if (!user.empty() && !group.empty()) |
0cf4dc9b | 117 | { |
644c4d26 | 118 | // TODO maybe use current user/group if one of them is empty |
0cf4dc9b | 119 | |
644c4d26 GE |
120 | struct passwd *socket_user = getpwnam (user.c_str()); |
121 | if (socket_user == NULL) | |
a7170401 GE |
122 | EXCEPTIONSTREAM(error,t2n_server_error,"error getting socket user: " << strerror(errno)); |
123 | ||
644c4d26 GE |
124 | struct group *socket_group = getgrnam (group.c_str()); |
125 | if (socket_group == NULL) | |
a7170401 GE |
126 | EXCEPTIONSTREAM(error,t2n_server_error,"error getting socket group: " << strerror(errno)); |
127 | ||
644c4d26 | 128 | if (chown (unix_name.sun_path, socket_user->pw_uid, socket_group->gr_gid) != 0) |
a7170401 | 129 | EXCEPTIONSTREAM(error,t2n_server_error,"error changing socket ownership: " << strerror(errno)); |
0cf4dc9b GE |
130 | } |
131 | ||
cc68aabb GE |
132 | start_listening(); |
133 | } | |
134 | ||
56f3994d TJ |
135 | /** |
136 | * Destructor | |
137 | */ | |
cc68aabb GE |
138 | socket_server::~socket_server() |
139 | { | |
56f3994d TJ |
140 | // close all client connections |
141 | server::close(); | |
142 | ||
143 | // server socket will be closed by destructor of socket_handler | |
cc68aabb GE |
144 | |
145 | if (get_type()==unix_s) | |
146 | unlink(unix_path.c_str()); | |
56f3994d TJ |
147 | |
148 | // disconnect connection<->server pointer | |
149 | std::map<unsigned int, server_connection*>::iterator it, it_end = connections.end(); | |
150 | for (it = connections.begin(); it != it_end; ++it) | |
151 | { | |
152 | socket_server_connection *conn = dynamic_cast<socket_server_connection*>(it->second); | |
153 | if (conn) | |
154 | conn->my_server = NULL; | |
155 | } | |
cc68aabb GE |
156 | } |
157 | ||
158 | /// start listening on a new server socket (called by the constructors) | |
159 | void socket_server::start_listening() | |
160 | { | |
0cf4dc9b | 161 | if (listen (sock, 5) < 0) |
a7170401 | 162 | EXCEPTIONSTREAM(error,t2n_server_error,"error listening to socket: " << strerror(errno)); |
0cf4dc9b GE |
163 | |
164 | /* clear & insert server sock into the fd_tab to prepare select */ | |
165 | FD_ZERO(&connection_set); | |
166 | FD_SET (sock, &connection_set); | |
167 | } | |
168 | ||
cc68aabb | 169 | /// handle a new connection from a client |
0cf4dc9b GE |
170 | void socket_server::new_connection() |
171 | { | |
04e6b271 | 172 | struct sockaddr_un clientname; |
ac7fdc22 | 173 | |
04e6b271 GE |
174 | unsigned int size = sizeof (clientname); |
175 | int newsock = accept (sock,(struct sockaddr *) &clientname,&size); | |
176 | if (newsock < 0) | |
177 | { | |
c7857475 GE |
178 | // return on non-fatal errors (list taken from man-page) |
179 | if (errno == EAGAIN || errno == EWOULDBLOCK || errno == ECONNABORTED || errno == EINTR || | |
180 | errno == EMFILE || errno == ENFILE || errno == ENOBUFS || errno == ENOMEM || | |
181 | errno == EPROTO || errno == EPERM || errno == ETIMEDOUT) | |
04e6b271 | 182 | { |
c7857475 | 183 | LOGSTREAM(error,"non-fatal accept error: " << strerror(errno)); |
04e6b271 GE |
184 | return; |
185 | } | |
186 | ||
c7857475 GE |
187 | /* fatal error: will usually kill or restart the server */ |
188 | EXCEPTIONSTREAM(error,t2n_server_error,"fatal error accepting connection: " << strerror(errno)); | |
04e6b271 GE |
189 | } |
190 | ||
191 | FD_SET (newsock, &connection_set); | |
192 | ||
a11e19b7 GE |
193 | socket_server_connection *nc=new socket_server_connection(newsock, get_type(), get_default_timeout()); |
194 | nc->set_socket_options(newsock); | |
04e6b271 | 195 | |
a11e19b7 | 196 | add_connection(nc); |
04e6b271 GE |
197 | |
198 | return; | |
0cf4dc9b | 199 | } |
ac7fdc22 | 200 | |
45a2ebc9 GE |
201 | /** @brief look for new connections and new data in any of the existing connections |
202 | @param usec_timeout wait until new data is found, max timeout usecs. | |
203 | -1: wait endless | |
204 | 0: return instantly | |
205 | @param usec_timeout_remaining if non-NULL the function will write the | |
206 | not used time to the given target | |
207 | @retval true if new data was found (does not mean that the received data | |
208 | is a complete packet though) | |
209 | */ | |
210 | bool socket_server::fill_buffer(long long usec_timeout,long long* usec_timeout_remaining) | |
ac7fdc22 | 211 | { |
0cf4dc9b GE |
212 | fd_set used_fdset=connection_set; |
213 | ||
214 | /* set timeout */ | |
215 | struct timeval tval; | |
216 | struct timeval *timeout_ptr; | |
217 | ||
218 | if (usec_timeout == -1) | |
219 | timeout_ptr = NULL; | |
220 | else | |
221 | { | |
222 | timeout_ptr = &tval; | |
223 | ||
224 | // timeout von long long usec in int sec + int usec umrechnen | |
225 | tval.tv_sec = usec_timeout / 1000000; | |
226 | tval.tv_usec = usec_timeout % 1000000; | |
227 | } | |
228 | ||
229 | int ret=select (FD_SETSIZE, &used_fdset, NULL, NULL, timeout_ptr); | |
230 | ||
45a2ebc9 GE |
231 | // return the timeout we did not use |
232 | if (usec_timeout > 0 && usec_timeout_remaining != NULL) | |
233 | *usec_timeout_remaining=(tval.tv_sec*1000000)+tval.tv_usec; | |
234 | ||
0cf4dc9b GE |
235 | if (ret < 0) |
236 | { | |
237 | if (errno == EINTR) | |
238 | { | |
239 | // select interrupted by signal | |
240 | ret=0; | |
241 | } | |
242 | else | |
a7170401 | 243 | EXCEPTIONSTREAM(error,t2n_server_error,"select error: " << strerror(errno)); |
0cf4dc9b GE |
244 | } |
245 | ||
246 | if (ret > 0) | |
247 | { | |
248 | // we have data pending | |
249 | ||
250 | // check for new connection | |
251 | if (FD_ISSET (sock, &used_fdset)) | |
252 | { | |
253 | new_connection(); | |
254 | } | |
255 | ||
256 | // check all connections for pending data | |
94247295 | 257 | return fill_connection_buffers(); |
0cf4dc9b | 258 | } |
ac7fdc22 | 259 | |
94247295 | 260 | return false; |
ac7fdc22 GE |
261 | } |
262 | ||
cc68aabb | 263 | /// call fill_buffer() on all connections, called from fill_buffer() |
94247295 | 264 | bool socket_server::fill_connection_buffers() |
aa499d20 | 265 | { |
20a05ab7 | 266 | bool data_found = false; |
94247295 | 267 | |
a11e19b7 GE |
268 | std::map<unsigned int, server_connection*>::iterator ie=connections.end(); |
269 | for(std::map<unsigned int, server_connection*>::iterator i=connections.begin(); i != ie; i++) | |
644c4d26 | 270 | if (!i->second->server_connection::is_closed()) |
c7857475 GE |
271 | { |
272 | // shutdown all connections which throw exceptions to protect the server | |
273 | try | |
274 | { | |
275 | if (i->second->fill_buffer(0)) | |
276 | data_found=true; | |
277 | } | |
278 | catch (t2n_transfer_error &e) | |
279 | { i->second->close(); } | |
c7857475 | 280 | } |
94247295 GE |
281 | |
282 | return data_found; | |
aa499d20 GE |
283 | } |
284 | ||
cc68aabb | 285 | /// remove the socket of a connection after the connection has been closed |
a11e19b7 | 286 | void socket_server::remove_connection_socket(int sock) |
ac7fdc22 | 287 | { |
a11e19b7 | 288 | FD_CLR(sock, &connection_set); |
ac7fdc22 GE |
289 | } |
290 | ||
56f3994d TJ |
291 | /** |
292 | * Destructor | |
293 | */ | |
294 | socket_server_connection::~socket_server_connection() | |
295 | { | |
296 | // Only notify parent server about going down. | |
297 | // The real socket will be closed by the destructor of the base classes. | |
298 | if (my_server && sock != -1) | |
299 | { | |
300 | socket_server *srv = dynamic_cast<socket_server*>(my_server); | |
301 | if (srv) | |
302 | srv->remove_connection_socket(sock); | |
303 | } | |
304 | } | |
305 | ||
cc68aabb | 306 | /// close this connection. complete data waiting in the buffer can still be retrieved. |
a11e19b7 | 307 | void socket_server_connection::close() |
ac7fdc22 | 308 | { |
56f3994d | 309 | if (my_server && sock != -1) |
aa499d20 | 310 | { |
56f3994d TJ |
311 | socket_server *srv = dynamic_cast<socket_server*>(my_server); |
312 | if (srv) | |
313 | srv->remove_connection_socket(sock); | |
aa499d20 GE |
314 | } |
315 | ||
56f3994d | 316 | if (!server_connection::is_closed()) |
aa499d20 | 317 | { |
56f3994d TJ |
318 | socket_handler::close(); |
319 | server_connection::close(); | |
aa499d20 | 320 | } |
ac7fdc22 GE |
321 | } |
322 | ||
323 | } |