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> | |
673142e5 | 31 | #include <sys/stat.h> |
0cf4dc9b GE |
32 | #include <arpa/inet.h> |
33 | #include <netinet/in.h> | |
34 | #include <netdb.h> | |
35 | #include <fcntl.h> | |
36 | #include <time.h> | |
37 | #include <pwd.h> | |
38 | #include <grp.h> | |
39 | ||
aa499d20 GE |
40 | #include <sstream> |
41 | ||
ac7fdc22 | 42 | #include "socket_server.hxx" |
0cf4dc9b | 43 | #include "t2n_exception.hxx" |
a7170401 | 44 | #include "log.hxx" |
0cf4dc9b GE |
45 | |
46 | using namespace std; | |
ac7fdc22 GE |
47 | |
48 | namespace libt2n | |
49 | { | |
50 | ||
94247295 GE |
51 | /** @brief create a new tcp-based server |
52 | @param port tcp port you want to listen on | |
53 | @param ip the local ip you want to listen on. "0.0.0.0" means all local ips (default). | |
54 | */ | |
644c4d26 | 55 | socket_server::socket_server(int port, const std::string& ip) |
a11e19b7 | 56 | : server(), socket_handler(0,tcp_s) |
ac7fdc22 | 57 | { |
cc68aabb GE |
58 | /* Create the socket. */ |
59 | sock = socket (PF_INET, SOCK_STREAM, 0); | |
60 | if (sock < 0) | |
a7170401 | 61 | EXCEPTIONSTREAM(error,t2n_server_error,"error opening socket: " << strerror(errno)); |
cc68aabb GE |
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) | |
a7170401 | 71 | EXCEPTIONSTREAM(error,t2n_server_error,"failed listening on invalid ip " << ip); |
cc68aabb GE |
72 | |
73 | if (bind (sock, (struct sockaddr *) &sockaddr, sizeof (sockaddr)) < 0) | |
238ad35f TJ |
74 | { |
75 | // FIXME: Calls virtual function socket_server::get_logstream() in constructor | |
a7170401 | 76 | EXCEPTIONSTREAM(error,t2n_server_error,"error binding socket: " << strerror(errno)); |
238ad35f | 77 | } |
cc68aabb GE |
78 | |
79 | start_listening(); | |
ac7fdc22 GE |
80 | } |
81 | ||
94247295 GE |
82 | /** @brief create a new unix-socked-based server |
83 | @param path path of the socket | |
84 | @param filemode permissions you want to open the socket with | |
85 | @param user local username for the socket | |
86 | @param group local groupname for the socket | |
87 | */ | |
644c4d26 | 88 | socket_server::socket_server(const std::string& path, mode_t filemode, const std::string& user, const std::string& group) |
a11e19b7 | 89 | : server(), socket_handler(0,unix_s) |
ac7fdc22 | 90 | { |
ac7fdc22 GE |
91 | unix_path=path; |
92 | ||
238ad35f TJ |
93 | // TODO: Every EXCEPTIONSTREAM in here calls virtual function get_logstream() |
94 | ||
ac7fdc22 | 95 | /* Create the socket. */ |
0cf4dc9b GE |
96 | sock = socket (PF_UNIX, SOCK_STREAM, 0); |
97 | if (sock < 0) | |
a7170401 | 98 | EXCEPTIONSTREAM(error,t2n_server_error,"error opening socket: " << strerror(errno)); |
0cf4dc9b GE |
99 | |
100 | set_socket_options(sock); | |
101 | ||
102 | /* Give the socket a name. */ | |
103 | struct sockaddr_un unix_name; | |
104 | unix_name.sun_family = AF_UNIX; | |
105 | strncpy (unix_name.sun_path, unix_path.c_str(),sizeof(unix_name.sun_path)); | |
106 | ||
107 | /* just to make sure there is no other socket file */ | |
108 | unlink (unix_name.sun_path); | |
109 | ||
110 | if (bind (sock, (struct sockaddr *) &unix_name, sizeof (unix_name)) < 0) | |
a7170401 | 111 | EXCEPTIONSTREAM(error,t2n_server_error,"error binding socket: " << strerror(errno)); |
0cf4dc9b GE |
112 | |
113 | /* change permissions */ | |
114 | if (chmod (unix_name.sun_path, filemode) != 0) | |
a7170401 | 115 | EXCEPTIONSTREAM(error,t2n_server_error,"error changing permission: " << strerror(errno)); |
0cf4dc9b | 116 | |
644c4d26 | 117 | if (!user.empty() && !group.empty()) |
0cf4dc9b | 118 | { |
644c4d26 | 119 | // TODO maybe use current user/group if one of them is empty |
0cf4dc9b | 120 | |
644c4d26 GE |
121 | struct passwd *socket_user = getpwnam (user.c_str()); |
122 | if (socket_user == NULL) | |
a7170401 GE |
123 | EXCEPTIONSTREAM(error,t2n_server_error,"error getting socket user: " << strerror(errno)); |
124 | ||
644c4d26 GE |
125 | struct group *socket_group = getgrnam (group.c_str()); |
126 | if (socket_group == NULL) | |
a7170401 GE |
127 | EXCEPTIONSTREAM(error,t2n_server_error,"error getting socket group: " << strerror(errno)); |
128 | ||
644c4d26 | 129 | if (chown (unix_name.sun_path, socket_user->pw_uid, socket_group->gr_gid) != 0) |
a7170401 | 130 | EXCEPTIONSTREAM(error,t2n_server_error,"error changing socket ownership: " << strerror(errno)); |
0cf4dc9b GE |
131 | } |
132 | ||
cc68aabb GE |
133 | start_listening(); |
134 | } | |
135 | ||
56f3994d TJ |
136 | /** |
137 | * Destructor | |
138 | */ | |
cc68aabb GE |
139 | socket_server::~socket_server() |
140 | { | |
56f3994d TJ |
141 | // close all client connections |
142 | server::close(); | |
143 | ||
144 | // server socket will be closed by destructor of socket_handler | |
cc68aabb GE |
145 | |
146 | if (get_type()==unix_s) | |
147 | unlink(unix_path.c_str()); | |
56f3994d TJ |
148 | |
149 | // disconnect connection<->server pointer | |
150 | std::map<unsigned int, server_connection*>::iterator it, it_end = connections.end(); | |
151 | for (it = connections.begin(); it != it_end; ++it) | |
152 | { | |
153 | socket_server_connection *conn = dynamic_cast<socket_server_connection*>(it->second); | |
154 | if (conn) | |
155 | conn->my_server = NULL; | |
156 | } | |
cc68aabb GE |
157 | } |
158 | ||
159 | /// start listening on a new server socket (called by the constructors) | |
160 | void socket_server::start_listening() | |
161 | { | |
0cf4dc9b | 162 | if (listen (sock, 5) < 0) |
a7170401 | 163 | EXCEPTIONSTREAM(error,t2n_server_error,"error listening to socket: " << strerror(errno)); |
0cf4dc9b GE |
164 | |
165 | /* clear & insert server sock into the fd_tab to prepare select */ | |
166 | FD_ZERO(&connection_set); | |
167 | FD_SET (sock, &connection_set); | |
168 | } | |
169 | ||
cc68aabb | 170 | /// handle a new connection from a client |
0cf4dc9b GE |
171 | void socket_server::new_connection() |
172 | { | |
04e6b271 | 173 | struct sockaddr_un clientname; |
ac7fdc22 | 174 | |
04e6b271 GE |
175 | unsigned int size = sizeof (clientname); |
176 | int newsock = accept (sock,(struct sockaddr *) &clientname,&size); | |
177 | if (newsock < 0) | |
178 | { | |
c7857475 GE |
179 | // return on non-fatal errors (list taken from man-page) |
180 | if (errno == EAGAIN || errno == EWOULDBLOCK || errno == ECONNABORTED || errno == EINTR || | |
181 | errno == EMFILE || errno == ENFILE || errno == ENOBUFS || errno == ENOMEM || | |
182 | errno == EPROTO || errno == EPERM || errno == ETIMEDOUT) | |
04e6b271 | 183 | { |
c7857475 | 184 | LOGSTREAM(error,"non-fatal accept error: " << strerror(errno)); |
04e6b271 GE |
185 | return; |
186 | } | |
187 | ||
c7857475 GE |
188 | /* fatal error: will usually kill or restart the server */ |
189 | EXCEPTIONSTREAM(error,t2n_server_error,"fatal error accepting connection: " << strerror(errno)); | |
04e6b271 GE |
190 | } |
191 | ||
192 | FD_SET (newsock, &connection_set); | |
193 | ||
a11e19b7 GE |
194 | socket_server_connection *nc=new socket_server_connection(newsock, get_type(), get_default_timeout()); |
195 | nc->set_socket_options(newsock); | |
04e6b271 | 196 | |
a11e19b7 | 197 | add_connection(nc); |
04e6b271 GE |
198 | |
199 | return; | |
0cf4dc9b | 200 | } |
ac7fdc22 | 201 | |
45a2ebc9 GE |
202 | /** @brief look for new connections and new data in any of the existing connections |
203 | @param usec_timeout wait until new data is found, max timeout usecs. | |
204 | -1: wait endless | |
205 | 0: return instantly | |
206 | @param usec_timeout_remaining if non-NULL the function will write the | |
207 | not used time to the given target | |
208 | @retval true if new data was found (does not mean that the received data | |
209 | is a complete packet though) | |
210 | */ | |
211 | bool socket_server::fill_buffer(long long usec_timeout,long long* usec_timeout_remaining) | |
ac7fdc22 | 212 | { |
0cf4dc9b GE |
213 | fd_set used_fdset=connection_set; |
214 | ||
215 | /* set timeout */ | |
216 | struct timeval tval; | |
217 | struct timeval *timeout_ptr; | |
218 | ||
219 | if (usec_timeout == -1) | |
220 | timeout_ptr = NULL; | |
221 | else | |
222 | { | |
223 | timeout_ptr = &tval; | |
224 | ||
225 | // timeout von long long usec in int sec + int usec umrechnen | |
226 | tval.tv_sec = usec_timeout / 1000000; | |
227 | tval.tv_usec = usec_timeout % 1000000; | |
228 | } | |
229 | ||
230 | int ret=select (FD_SETSIZE, &used_fdset, NULL, NULL, timeout_ptr); | |
231 | ||
45a2ebc9 GE |
232 | // return the timeout we did not use |
233 | if (usec_timeout > 0 && usec_timeout_remaining != NULL) | |
234 | *usec_timeout_remaining=(tval.tv_sec*1000000)+tval.tv_usec; | |
235 | ||
0cf4dc9b GE |
236 | if (ret < 0) |
237 | { | |
238 | if (errno == EINTR) | |
239 | { | |
240 | // select interrupted by signal | |
241 | ret=0; | |
242 | } | |
243 | else | |
a7170401 | 244 | EXCEPTIONSTREAM(error,t2n_server_error,"select error: " << strerror(errno)); |
0cf4dc9b GE |
245 | } |
246 | ||
247 | if (ret > 0) | |
248 | { | |
249 | // we have data pending | |
250 | ||
251 | // check for new connection | |
252 | if (FD_ISSET (sock, &used_fdset)) | |
253 | { | |
254 | new_connection(); | |
255 | } | |
256 | ||
257 | // check all connections for pending data | |
94247295 | 258 | return fill_connection_buffers(); |
0cf4dc9b | 259 | } |
ac7fdc22 | 260 | |
94247295 | 261 | return false; |
ac7fdc22 GE |
262 | } |
263 | ||
cc68aabb | 264 | /// call fill_buffer() on all connections, called from fill_buffer() |
94247295 | 265 | bool socket_server::fill_connection_buffers() |
aa499d20 | 266 | { |
20a05ab7 | 267 | bool data_found = false; |
94247295 | 268 | |
a11e19b7 GE |
269 | std::map<unsigned int, server_connection*>::iterator ie=connections.end(); |
270 | for(std::map<unsigned int, server_connection*>::iterator i=connections.begin(); i != ie; i++) | |
644c4d26 | 271 | if (!i->second->server_connection::is_closed()) |
c7857475 GE |
272 | { |
273 | // shutdown all connections which throw exceptions to protect the server | |
274 | try | |
275 | { | |
276 | if (i->second->fill_buffer(0)) | |
277 | data_found=true; | |
278 | } | |
279 | catch (t2n_transfer_error &e) | |
280 | { i->second->close(); } | |
c7857475 | 281 | } |
94247295 GE |
282 | |
283 | return data_found; | |
aa499d20 GE |
284 | } |
285 | ||
cc68aabb | 286 | /// remove the socket of a connection after the connection has been closed |
a11e19b7 | 287 | void socket_server::remove_connection_socket(int sock) |
ac7fdc22 | 288 | { |
a11e19b7 | 289 | FD_CLR(sock, &connection_set); |
ac7fdc22 GE |
290 | } |
291 | ||
56f3994d TJ |
292 | /** |
293 | * Destructor | |
294 | */ | |
295 | socket_server_connection::~socket_server_connection() | |
296 | { | |
297 | // Only notify parent server about going down. | |
298 | // The real socket will be closed by the destructor of the base classes. | |
299 | if (my_server && sock != -1) | |
300 | { | |
301 | socket_server *srv = dynamic_cast<socket_server*>(my_server); | |
302 | if (srv) | |
303 | srv->remove_connection_socket(sock); | |
304 | } | |
305 | } | |
306 | ||
cc68aabb | 307 | /// close this connection. complete data waiting in the buffer can still be retrieved. |
a11e19b7 | 308 | void socket_server_connection::close() |
ac7fdc22 | 309 | { |
56f3994d | 310 | if (my_server && sock != -1) |
aa499d20 | 311 | { |
56f3994d TJ |
312 | socket_server *srv = dynamic_cast<socket_server*>(my_server); |
313 | if (srv) | |
314 | srv->remove_connection_socket(sock); | |
aa499d20 GE |
315 | } |
316 | ||
56f3994d | 317 | if (!server_connection::is_closed()) |
aa499d20 | 318 | { |
56f3994d TJ |
319 | socket_handler::close(); |
320 | server_connection::close(); | |
aa499d20 | 321 | } |
ac7fdc22 GE |
322 | } |
323 | ||
324 | } |