gvpe/src/util.C

/*
    util.C -- process management and other utility functions
    
    Some of these are taken from tinc, see the AUTHORS file.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "config.h"

#include <cstdio>
#include <cstring>

#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <time.h>

#include "netcompat.h"

#include "gettext.h"
#include "pidfile.h"
#include "dropin.h"

#include "global.h"
#include "conf.h"
#include "util.h"
#include "slog.h"

int
write_pidfile (void)
{
  int pid;

  pid = check_pid (pidfilename);

  if (pid)
    {
      fprintf (stderr, _("A vped is already running with pid %d.\n"), pid);
      return 1;
    }

  /* if it's locked, write-protected, or whatever */
  if (!write_pid (pidfilename))
    return 1;

  return 0;
}

int
kill_other (int signal)
{
  int pid;

  pid = read_pid (pidfilename);

  if (!pid)
    {
      fprintf (stderr, _("No other vped is running.\n"));
      return 1;
    }

  errno = 0;                    /* No error, sometimes errno is only changed on error */

  /* ESRCH is returned when no process with that pid is found */
  if (kill (pid, signal) && errno == ESRCH)
    {
      fprintf (stderr, _("The vped is no longer running. "));

      fprintf (stderr, _("Removing stale lock file.\n"));
      remove_pid (pidfilename);
    }

  return 0;
}

int
detach (int do_detach)
{
  /* First check if we can open a fresh new pidfile */

  if (write_pidfile ())
    return -1;

  /* If we succeeded in doing that, detach */

  log_to (0);

  if (do_detach)
    {
      if (daemon (0, 0) < 0)
        {
          log_to (LOGTO_SYSLOG | LOGTO_STDERR);

          slog (L_ERR, _("couldn't detach from terminal: %s"), strerror (errno));
          return -1;
        }

      /* Now UPDATE the pid in the pidfile, because we changed it... */

      if (!write_pid (pidfilename))
        return -1;

      log_to (LOGTO_SYSLOG);
    }
  else
    log_to (LOGTO_SYSLOG | LOGTO_STDERR);

  slog (L_INFO, _("vped %s (%s %s) starting"), VERSION, __DATE__, __TIME__);

  return 0;
}

void
make_names (void)
{
  if (!pidfilename)
    pidfilename = LOCALSTATEDIR "/run/vped.pid";

  if (!confbase)
    asprintf (&confbase, "%s/vpe", CONFDIR);
}

void run_script (const run_script_cb &cb, bool wait)
{
  int pid;

  if ((pid = fork ()) == 0)
    {
      char *filename;
      asprintf (&filename, "%s/%s", confbase, cb());
      execl (filename, filename, (char *) 0);
      exit (255);
    }
  else if (pid > 0)
    {
      if (wait)
        {
          waitpid (pid, 0, 0);
          /* TODO: check status */
        }
    }
}

#if ENABLE_HTTP_PROXY
// works like strdup
u8 *
base64_encode (const u8 *data, unsigned int len)
{
  const static char base64[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

  unsigned int t, i;
  const u8 *end = data + len;
  u8 *res = new u8 [4 * ((len + 2) / 3) + 1];
  u8 *out = res;

  while (data <= end - 3)
    {
      t = (((data[0] << 8) | data[1]) << 8) | data[2];
      data += 3;
      
      *out++ = base64[(t >> 18) & 0x3f];
      *out++ = base64[(t >> 12) & 0x3f];
      *out++ = base64[(t >>  6) & 0x3f];
      *out++ = base64[(t      ) & 0x3f];
    }

  for (t = 0, i = 0; data < end; i++)
    t = (t << 8) | *data++;

  switch (i)
    {
      case 2:
        *out++ = base64[(t >> 10) & 0x3f];
        *out++ = base64[(t >>  4) & 0x3f];
        *out++ = base64[(t <<  2) & 0x3f];
        *out++ = '=';
        break;
      case 1:
        *out++ = base64[(t >>  2) & 0x3f];
        *out++ = base64[(t <<  4) & 0x3f];
        *out++ = '=';
        *out++ = '=';
        break;
    }

  *out++ = 0;

  return res;
}
#endif

void
id2mac (unsigned int id, void *m)
{
  mac &p = *(mac *)m;

  if (id)
    {
      p[0] = 0xfe;
      p[1] = 0xfd;
      p[2] = 0x80;
      p[3] = 0x00;
      p[4] = id >> 8;
      p[5] = id;
    }
  else
    {
      p[0] = 0xff;
      p[1] = 0xff;
      p[2] = 0xff;
      p[3] = 0xff;
      p[4] = 0xff;
      p[5] = 0xff;
    }
}

Revision:	1.10
Committed:	Thu Oct 16 02:28:36 2003 UTC (20 years, 7 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.9:	+25 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			util.C -- process management and other utility functions
3
4	pcg	1.3	Some of these are taken from tinc, see the AUTHORS file.
5	pcg	1.1
6			This program is free software; you can redistribute it and/or modify
7			it under the terms of the GNU General Public License as published by
8			the Free Software Foundation; either version 2 of the License, or
9			(at your option) any later version.
10
11			This program is distributed in the hope that it will be useful,
12			but WITHOUT ANY WARRANTY; without even the implied warranty of
13			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			GNU General Public License for more details.
15
16			You should have received a copy of the GNU General Public License
17			along with this program; if not, write to the Free Software
18			Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19			*/
20
21			#include "config.h"
22
23			#include <cstdio>
24			#include <cstring>
25
26			#include <errno.h>
27			#include <signal.h>
28			#include <sys/types.h>
29	pcg	1.4	#include <sys/wait.h>
30	pcg	1.1	#include <unistd.h>
31			#include <time.h>
32
33	pcg	1.8	#include "netcompat.h"
34	pcg	1.1
35			#include "gettext.h"
36			#include "pidfile.h"
37			#include "dropin.h"
38
39			#include "global.h"
40			#include "conf.h"
41	pcg	1.5	#include "util.h"
42	pcg	1.1	#include "slog.h"
43
44			int
45			write_pidfile (void)
46			{
47			int pid;
48
49			pid = check_pid (pidfilename);
50
51			if (pid)
52			{
53			fprintf (stderr, _("A vped is already running with pid %d.\n"), pid);
54			return 1;
55			}
56
57			/* if it's locked, write-protected, or whatever */
58			if (!write_pid (pidfilename))
59			return 1;
60
61			return 0;
62			}
63
64			int
65			kill_other (int signal)
66			{
67			int pid;
68
69			pid = read_pid (pidfilename);
70
71			if (!pid)
72			{
73			fprintf (stderr, _("No other vped is running.\n"));
74			return 1;
75			}
76
77			errno = 0; /* No error, sometimes errno is only changed on error */
78
79			/* ESRCH is returned when no process with that pid is found */
80			if (kill (pid, signal) && errno == ESRCH)
81			{
82			fprintf (stderr, _("The vped is no longer running. "));
83
84			fprintf (stderr, _("Removing stale lock file.\n"));
85			remove_pid (pidfilename);
86			}
87
88			return 0;
89			}
90
91			int
92			detach (int do_detach)
93			{
94			/* First check if we can open a fresh new pidfile */
95
96			if (write_pidfile ())
97			return -1;
98
99			/* If we succeeded in doing that, detach */
100
101			log_to (0);
102
103			if (do_detach)
104			{
105			if (daemon (0, 0) < 0)
106			{
107			log_to (LOGTO_SYSLOG \| LOGTO_STDERR);
108
109			slog (L_ERR, _("couldn't detach from terminal: %s"), strerror (errno));
110			return -1;
111			}
112
113			/* Now UPDATE the pid in the pidfile, because we changed it... */
114
115			if (!write_pid (pidfilename))
116			return -1;
117
118			log_to (LOGTO_SYSLOG);
119			}
120			else
121			log_to (LOGTO_SYSLOG \| LOGTO_STDERR);
122
123			slog (L_INFO, _("vped %s (%s %s) starting"), VERSION, __DATE__, __TIME__);
124
125			return 0;
126			}
127
128			void
129			make_names (void)
130			{
131			if (!pidfilename)
132			pidfilename = LOCALSTATEDIR "/run/vped.pid";
133
134			if (!confbase)
135			asprintf (&confbase, "%s/vpe", CONFDIR);
136			}
137
138	pcg	1.4	void run_script (const run_script_cb &cb, bool wait)
139			{
140			int pid;
141
142			if ((pid = fork ()) == 0)
143			{
144			char *filename;
145	pcg	1.6	asprintf (&filename, "%s/%s", confbase, cb());
146	pcg	1.4	execl (filename, filename, (char *) 0);
147			exit (255);
148			}
149			else if (pid > 0)
150			{
151			if (wait)
152			{
153			waitpid (pid, 0, 0);
154			/* TODO: check status */
155			}
156			}
157			}
158	pcg	1.7
159			#if ENABLE_HTTP_PROXY
160			// works like strdup
161			u8 *
162			base64_encode (const u8 *data, unsigned int len)
163			{
164			const static char base64[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
165
166			unsigned int t, i;
167			const u8 *end = data + len;
168			u8 res = new u8 [4 ((len + 2) / 3) + 1];
169			u8 *out = res;
170
171			while (data <= end - 3)
172			{
173			t = (((data[0] << 8) \| data[1]) << 8) \| data[2];
174			data += 3;
175
176			*out++ = base64[(t >> 18) & 0x3f];
177			*out++ = base64[(t >> 12) & 0x3f];
178			*out++ = base64[(t >> 6) & 0x3f];
179			*out++ = base64[(t ) & 0x3f];
180			}
181
182			for (t = 0, i = 0; data < end; i++)
183			t = (t << 8) \| *data++;
184
185			switch (i)
186			{
187			case 2:
188			*out++ = base64[(t >> 10) & 0x3f];
189			*out++ = base64[(t >> 4) & 0x3f];
190			*out++ = base64[(t << 2) & 0x3f];
191			*out++ = '=';
192			break;
193			case 1:
194			*out++ = base64[(t >> 2) & 0x3f];
195			*out++ = base64[(t << 4) & 0x3f];
196			*out++ = '=';
197			*out++ = '=';
198			break;
199			}
200
201			*out++ = 0;
202
203			return res;
204			}
205			#endif
206
207	pcg	1.10	void
208			id2mac (unsigned int id, void *m)
209			{
210			mac &p = (mac )m;
211
212			if (id)
213			{
214			p[0] = 0xfe;
215			p[1] = 0xfd;
216			p[2] = 0x80;
217			p[3] = 0x00;
218			p[4] = id >> 8;
219			p[5] = id;
220			}
221			else
222			{
223			p[0] = 0xff;
224			p[1] = 0xff;
225			p[2] = 0xff;
226			p[3] = 0xff;
227			p[4] = 0xff;
228			p[5] = 0xff;
229			}
230			}
231