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Comparing gvpe/src/util.C (file contents):
Revision 1.4 by pcg, Wed Apr 2 03:06:22 2003 UTC vs.
Revision 1.25 by root, Tue Mar 8 17:33:31 2011 UTC

1/* 1/*
2 util.C -- process management and other utility functions 2 util.C -- process management and other utility functions
3 Copyright (C) 2003-2011 Marc Lehmann <gvpe@schmorp.de>
3 4
4 Some of these are taken from tinc, see the AUTHORS file. 5 Some of these are taken from tinc, see the AUTHORS file.
5 6
7 This file is part of GVPE.
8
6 This program is free software; you can redistribute it and/or modify 9 GVPE is free software; you can redistribute it and/or modify it
7 it under the terms of the GNU General Public License as published by 10 under the terms of the GNU General Public License as published by the
8 the Free Software Foundation; either version 2 of the License, or 11 Free Software Foundation; either version 3 of the License, or (at your
9 (at your option) any later version. 12 option) any later version.
10 13
11 This program is distributed in the hope that it will be useful, 14 This program is distributed in the hope that it will be useful, but
12 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
14 GNU General Public License for more details. 17 Public License for more details.
15 18
16 You should have received a copy of the GNU General Public License 19 You should have received a copy of the GNU General Public License along
17 along with this program; if not, write to the Free Software 20 with this program; if not, see <http://www.gnu.org/licenses/>.
18 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21
22 Additional permission under GNU GPL version 3 section 7
23
24 If you modify this Program, or any covered work, by linking or
25 combining it with the OpenSSL project's OpenSSL library (or a modified
26 version of that library), containing parts covered by the terms of the
27 OpenSSL or SSLeay licenses, the licensors of this Program grant you
28 additional permission to convey the resulting work. Corresponding
29 Source for a non-source form of such a combination shall include the
30 source code for the parts of OpenSSL used as well as that of the
31 covered work.
19*/ 32*/
20 33
21#include "config.h" 34#include "config.h"
22 35
23#include <cstdio> 36#include <cstdio>
37#include <cstdlib>
24#include <cstring> 38#include <cstring>
39
40#include <queue>
25 41
26#include <errno.h> 42#include <errno.h>
27#include <signal.h> 43#include <signal.h>
28#include <sys/types.h> 44#include <sys/types.h>
29#include <sys/wait.h> 45#include <sys/wait.h>
30#include <unistd.h> 46#include <unistd.h>
31#include <time.h> 47#include <time.h>
32#include <sys/socket.h>
33#include <netinet/in.h>
34#include <arpa/inet.h>
35 48
49#if ENABLE_PTHREADS
50# include <pthread.h>
51#endif
36 52
37#include <sys/mman.h> 53#include "netcompat.h"
38 54
39#include "gettext.h" 55#include "gettext.h"
40#include "pidfile.h" 56#include "pidfile.h"
41#include "dropin.h" 57#include "dropin.h"
42 58
43#include "global.h" 59#include "global.h"
44#include "conf.h" 60#include "conf.h"
61#include "util.h"
45#include "slog.h" 62#include "slog.h"
46#include "protocol.h"
47 63
48int 64int
49write_pidfile (void) 65write_pidfile (void)
50{ 66{
51 int pid; 67 int pid;
52 68
53 pid = check_pid (pidfilename); 69 pid = check_pid (conf.pidfilename);
54 70
55 if (pid) 71 if (pid)
56 { 72 {
57 fprintf (stderr, _("A vped is already running with pid %d.\n"), pid); 73 fprintf (stderr, _("A gvpe daemon is already running with pid %d.\n"), pid);
58 return 1; 74 return 1;
59 } 75 }
60 76
61 /* if it's locked, write-protected, or whatever */ 77 /* if it's locked, write-protected, or whatever */
62 if (!write_pid (pidfilename)) 78 if (!write_pid (conf.pidfilename))
63 return 1; 79 return 1;
64 80
65 return 0; 81 return 0;
66} 82}
67 83
68int 84int
69kill_other (int signal) 85kill_other (int signal)
70{ 86{
71 int pid; 87 int pid;
72 88
73 pid = read_pid (pidfilename); 89 pid = read_pid (conf.pidfilename);
74 90
75 if (!pid) 91 if (!pid)
76 { 92 {
77 fprintf (stderr, _("No other vped is running.\n")); 93 fprintf (stderr, _("No other gvpe daemon is running.\n"));
78 return 1; 94 return 1;
79 } 95 }
80 96
81 errno = 0; /* No error, sometimes errno is only changed on error */ 97 errno = 0; /* No error, sometimes errno is only changed on error */
82 98
83 /* ESRCH is returned when no process with that pid is found */ 99 /* ESRCH is returned when no process with that pid is found */
84 if (kill (pid, signal) && errno == ESRCH) 100 if (kill (pid, signal) && errno == ESRCH)
85 { 101 {
86 fprintf (stderr, _("The vped is no longer running. ")); 102 fprintf (stderr, _("The gvpe daemon is no longer running. "));
87 103
88 fprintf (stderr, _("Removing stale lock file.\n")); 104 fprintf (stderr, _("Removing stale lock file.\n"));
89 remove_pid (pidfilename); 105 remove_pid (conf.pidfilename);
90 } 106 }
91 107
92 return 0; 108 return 0;
93} 109}
94 110
… …
114 return -1; 130 return -1;
115 } 131 }
116 132
117 /* Now UPDATE the pid in the pidfile, because we changed it... */ 133 /* Now UPDATE the pid in the pidfile, because we changed it... */
118 134
119 if (!write_pid (pidfilename)) 135 if (!write_pid (conf.pidfilename))
120 return -1; 136 return -1;
121 137
122 log_to (LOGTO_SYSLOG); 138 log_to (LOGTO_SYSLOG);
123 } 139 }
124 else 140 else
125 log_to (LOGTO_SYSLOG | LOGTO_STDERR); 141 log_to (LOGTO_SYSLOG | LOGTO_STDERR);
126 142
127 slog (L_INFO, _("vped %s (%s %s) starting"), VERSION, __DATE__, __TIME__); 143 slog (L_INFO, _("gvpe daemon %s (%s %s) starting up."), VERSION, __DATE__, __TIME__);
128 144
129 return 0; 145 return 0;
130} 146}
131 147
132void 148/*****************************************************************************/
133make_names (void)
134{
135 if (!pidfilename)
136 pidfilename = LOCALSTATEDIR "/run/vped.pid";
137 149
138 if (!confbase) 150pid_t
139 asprintf (&confbase, "%s/vpe", CONFDIR);
140}
141
142void run_script (const run_script_cb &cb, bool wait) 151run_script (const run_script_cb &cb, bool wait)
143{ 152{
144 int pid; 153 sigset_t oldset;
145 154
146 if ((pid = fork ()) == 0) 155 if (wait)
156 {
157 sigset_t sigchld;
158 sigemptyset (&sigchld);
159 sigaddset (&sigchld, SIGCHLD);
160 sigprocmask (SIG_BLOCK, &sigchld, &oldset);
147 { 161 }
148 char *filename; 162
149 asprintf (&filename, "%s/%s", confbase, cb(0)); 163 pid_t pid = fork ();
150 execl (filename, filename, (char *) 0); 164
151 exit (255); 165 if (pid == 0)
166 {
167 sigprocmask (SIG_SETMASK, &oldset, 0);
168
169 execl ("/bin/sh", "/bin/sh", "-c", cb (), (char *) 0);
170 exit (EXIT_FAILURE);
152 } 171 }
153 else if (pid > 0) 172 else if (pid > 0)
154 { 173 {
155 if (wait) 174 if (wait)
156 { 175 {
176 int status;
157 waitpid (pid, 0, 0); 177 int res = waitpid (pid, &status, 0);
158 /* TODO: check status */ 178
179 sigprocmask (SIG_SETMASK, &oldset, 0);
180
181 if (res < 0)
182 {
183 slog (L_WARN, _("waiting for an external command failed: %s."),
184 strerror (errno));
185 return 0;
186 }
187 else if (!WIFEXITED (status) || WEXITSTATUS (status) != EXIT_SUCCESS)
188 {
189 slog (L_WARN, _("external command returned with exit status %d (%04x)."),
190 WEXITSTATUS (status), status);
191 return 0;
192 }
159 } 193 }
160 } 194 }
195 else
196 {
197 slog (L_ERR, _("unable to fork, exiting: %s"), strerror (errno));
198 exit (EXIT_FAILURE);
199 }
200
201 return pid;
161} 202}
203
204/*****************************************************************************/
205
206#if 0 /* not yet used */
207
208#if ENABLE_PTHREADS
209struct async_cb
210{
211 callback<void ()> work_cb;
212 callback<void ()> done_cb;
213};
214
215static ev::async async_done_w;
216static std::queue< callback<void ()> > async_q;
217
218static callback<void ()> work_cb;
219
220static void *
221async_exec (void *)
222{
223 work_cb ();
224 async_done_w.send ();
225
226 return 0;
227}
228
229static void
230async_q_next ()
231{
232 work_cb = async_q.front (); async_q.pop ();
233
234 sigset_t fullsigset, oldsigset;
235 pthread_attr_t attr;
236 pthread_t tid;
237
238 pthread_attr_init (&attr);
239 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
240 //pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN < X_STACKSIZE ? X_STACKSIZE : PTHREAD_STACK_MIN);
241 sigfillset (&fullsigset);
242 pthread_sigmask (SIG_SETMASK, &fullsigset, &oldsigset);
243
244 if (pthread_create (&tid, &attr, async_exec, 0))
245 async_exec (0);
246
247 pthread_sigmask (SIG_SETMASK, &oldsigset, 0);
248 pthread_attr_destroy (&attr);
249}
250
251namespace {
252 void
253 async_done (ev::async &w, int revents)
254 {
255 callback<void ()> done_cb = async_q.front (); async_q.pop ();
256
257 if (async_q.empty ())
258 async_done_w.stop ();
259 else
260 async_q_next ();
261
262 done_cb ();
263 }
264};
265
266void
267async (callback<void ()> work_cb, callback<void ()> done_cb)
268{
269 bool was_empty = async_q.empty ();
270
271 async_q.push (work_cb);
272 async_q.push (done_cb);
273
274 if (was_empty)
275 {
276 async_done_w.set<async_done> ();
277 async_done_w.start ();
278 async_q_next ();
279 }
280}
281
282#else
283
284void
285async (callback<void ()> work_cb, callback<void ()> done_cb)
286{
287 work_cb ();
288 done_cb ();
289}
290
291#endif
292
293#endif
294
295/*****************************************************************************/
296
297#if ENABLE_HTTP_PROXY
298// works like strdup
299u8 *
300base64_encode (const u8 *data, unsigned int len)
301{
302 const static char base64[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
303
304 unsigned int t, i;
305 const u8 *end = data + len;
306 u8 *res = new u8 [4 * ((len + 2) / 3) + 1];
307 u8 *out = res;
308
309 while (data <= end - 3)
310 {
311 t = (((data[0] << 8) | data[1]) << 8) | data[2];
312 data += 3;
313
314 *out++ = base64[(t >> 18) & 0x3f];
315 *out++ = base64[(t >> 12) & 0x3f];
316 *out++ = base64[(t >> 6) & 0x3f];
317 *out++ = base64[(t ) & 0x3f];
318 }
319
320 for (t = 0, i = 0; data < end; i++)
321 t = (t << 8) | *data++;
322
323 switch (i)
324 {
325 case 2:
326 *out++ = base64[(t >> 10) & 0x3f];
327 *out++ = base64[(t >> 4) & 0x3f];
328 *out++ = base64[(t << 2) & 0x3f];
329 *out++ = '=';
330 break;
331 case 1:
332 *out++ = base64[(t >> 2) & 0x3f];
333 *out++ = base64[(t << 4) & 0x3f];
334 *out++ = '=';
335 *out++ = '=';
336 break;
337 }
338
339 *out++ = 0;
340
341 return res;
342}
343#endif
344
345void
346id2mac (unsigned int id, void *m)
347{
348 mac &p = *(mac *)m;
349
350 if (id)
351 {
352 p[0] = 0xfe;
353 p[1] = 0xfd;
354 p[2] = 0x80;
355 p[3] = 0x00;
356 p[4] = id >> 8;
357 p[5] = id;
358 }
359 else
360 {
361 p[0] = 0xff;
362 p[1] = 0xff;
363 p[2] = 0xff;
364 p[3] = 0xff;
365 p[4] = 0xff;
366 p[5] = 0xff;
367 }
368}
369

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