summaryrefslogtreecommitdiffstats
path: root/libexec/xtend/xtend.c
blob: 1ffc448d46db03aab91e0ea5f9cb4a65c0a8d44a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
/*-
 * Copyright (c) 1992, 1993, 1995 Eugene W. Stark
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Eugene W. Stark.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY EUGENE W. STARK (THE AUTHOR) ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char rcsid[] =
	"$Id$";
#endif /* not lint */

/*
 * xtend - X-10 daemon
 * Eugene W. Stark (stark@cs.sunysb.edu)
 * January 14, 1993
 */

#include <err.h>
#include <pwd.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/file.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <grp.h>

#include "xtend.h"
#include "xten.h"
#include "paths.h"

FILE *Log;			/* Log file */
FILE *User;    			/* User connection */
STATUS Status[16][16];		/* Device status table */
int status;			/* Status file descriptor */
int tw523;			/* tw523 controller */
int sock;			/* socket for user */
jmp_buf mainloop;		/* longjmp point after SIGHUP */
void onhup();			/* SIGHUP handler */
void onterm();			/* SIGTERM handler */
void onpipe();			/* SIGPIPE handler */

void checkpoint_status __P((void));
void initstatus __P((void));
void logpacket __P((unsigned char *));
void processpacket __P((unsigned char *));
int user_command __P((void));

int
main(argc, argv)
int argc;
char *argv[];
{
  char *twpath = TWPATH;
  char *sockpath = SOCKPATH;
  char logpath[MAXPATHLEN+1];
  char statpath[MAXPATHLEN+1];
  struct sockaddr_un sa;
  struct timeval tv;
  struct passwd *pw;
  struct group *gr;
  struct stat sb;
  int user;
  FILE *pidf;

  /*
   * Make sure we start out running as root
   */
  if(geteuid() != 0)
    errx(1, "you must be root");

  /*
   * Find out what UID/GID we are to run as
   */
  if((pw = getpwnam(XTENUNAME)) == NULL)
    errx(1, "no such user '%s'", XTENUNAME);
  if((gr = getgrnam(XTENGNAME)) == NULL)
    errx(1, "no such group '%s'", XTENGNAME);

  /*
   * Open the log file before doing anything else
   */
  strcpy(logpath, X10DIR);
  if(stat(logpath, &sb) == -1 && errno == ENOENT) {
    if(mkdir(logpath, 0755) != -1) {
      chown(logpath, pw->pw_uid, gr->gr_gid);
    } else {
      errx(1, "can't create directory '%s'", logpath);
    }
  }
  strcat(logpath, "/");
  strcat(logpath, X10LOGNAME);
  if((Log = fopen(logpath, "a")) == NULL)
    errx(1, "can't open log file '%s'", logpath);
  chown(logpath, pw->pw_uid, gr->gr_gid);

  /*
   * Become a daemon
   */
  if(daemon(0, 0) == -1) {
    fprintf(Log, "%s:  Unable to become a daemon\n", thedate());
    fclose(Log);
    exit(1);
  }
  fprintf(Log, "%s:  %s [%d] started\n", thedate(), argv[0], getpid());

  /*
   * Get ahold of the TW523 device
   */
  if((tw523 = open(twpath, O_RDWR)) < 0) {
    fprintf(Log, "%s:  Can't open %s\n", thedate(), twpath);
    fclose(Log);
    exit(1);
  }
  fprintf(Log, "%s:  %s successfully opened\n", thedate(), twpath);

  /*
   * Put our pid in a file so we can be signalled by shell scripts
   */
  if((pidf = fopen(PIDPATH, "w")) == NULL) {
      fprintf(Log, "%s:  Error writing pid file: %s\n", thedate(), PIDPATH);
      fclose(Log);
      exit(1);
  }
  fprintf(pidf, "%d\n", getpid());
  fclose(pidf);

  /*
   * Set up socket to accept user commands
   */
  if((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
    fprintf(Log, "%s:  Can't create socket\n", thedate());
    fclose(Log);
    exit(1);
  }
  strcpy(sa.sun_path, sockpath);
  sa.sun_family = AF_UNIX;
  unlink(sockpath);
  if(bind(sock, (struct sockaddr *)(&sa), strlen(sa.sun_path) + 2) < 0) {
    fprintf(Log, "%s:  Can't bind socket to %s\n", thedate(), sockpath);
    fclose(Log);
    exit(1);
  }
  if(listen(sock, 5) < 0) {
    fprintf(Log, "%s:  Can't listen on socket\n", thedate());
    fclose(Log);
    exit(1);
  }

  /*
   * Set proper ownership and permissions on the socket
   */
  if(chown(sockpath, pw->pw_uid, gr->gr_gid) == -1 ||
     chmod(sockpath, 0660) == -1) {
    fprintf(Log, "%s:  Can't set owner/permissions on socket\n", thedate());
    fclose(Log);
    exit(1);
  }

  /*
   * Give up root privileges
   */
  setgid(pw->pw_gid);
  setuid(pw->pw_uid);

  /*
   * Initialize the status table
   */
  strcpy(statpath, X10DIR);
  strcat(statpath, "/");
  strcat(statpath, X10STATNAME);
  if((status = open(statpath, O_RDWR)) < 0) {
    if((status = open(statpath, O_RDWR | O_CREAT, 0666)) < 0) {
      fprintf(Log, "%s:  Can't open %s\n", thedate(), statpath);
      fclose(Log);
      exit(1);
    }
    if(write(status, Status, 16 * 16 * sizeof(STATUS))
       != 16 * 16 * sizeof(STATUS)) {
      fprintf(Log, "%s:  Error initializing status file\n", thedate());
      fclose(Log);
      exit(1);
    }
  }
  initstatus();

  /*
   * Return here on SIGHUP after closing and reopening log file.
   * Also on SIGPIPE after closing user connection.
   */
  signal(SIGTERM, onterm);
  signal(SIGHUP, onhup);
  signal(SIGPIPE, onpipe);
  setjmp(mainloop);

  /*
   * Now start the main processing loop.
   */
  tv.tv_sec = 0;
  tv.tv_usec = 250000;
  while(1) {
    fd_set fs;
    unsigned char rpkt[3];
    int sel, h, k;
    STATUS *s;

    FD_ZERO(&fs);
    FD_SET(tw523, &fs);
    if(User != NULL) FD_SET(user, &fs);
    else FD_SET(sock, &fs);
    sel = select(FD_SETSIZE, &fs, 0, 0, &tv);
    if(sel == 0) {
      /*
       * Cancel brightening and dimming on ALL units on ALL house codes,
       * because the fact that we haven't gotten a packet for awhile means
       * that there was a gap in transmission.
       */
      for(h = 0; h < 16; h++) {
	for(k = 0; k < 16; k++) {
	  s = &Status[h][k];
	  if(s->selected == BRIGHTENING || s->selected == DIMMING) {
	    s->selected = IDLE;
	    s->lastchange = time(NULL);
	    s->changed = 1;
	  }
	}
      }
      fflush(Log);
      checkpoint_status();
      /*
       * Now that we've done this stuff, we'll set the timeout a little
       * longer, so we don't keep looping too frequently.
       */
      tv.tv_sec = 60;
      tv.tv_usec = 0;
      continue;
    }
    /*
     * While there is stuff happening, we keep a short timeout, so we
     * don't get stuck for some unknown reason, and so we can keep the
     * brightening and dimming data up-to-date.
     */
    tv.tv_sec = 0;
    tv.tv_usec = 250000;
    if(FD_ISSET(tw523, &fs)) {  /* X10 data arriving from TW523 */
      if(read(tw523, rpkt, 3) < 3) {
	fprintf(Log, "%s:  Error reading from TW523\n", thedate());
      } else {
	logpacket(rpkt);
	processpacket(rpkt);
      }
    } else if(FD_ISSET(user, &fs)) {
      if(User != NULL) {
	if(user_command()) {
	  fprintf(Log, "%s:  Closing user connection\n", thedate());
	  fclose(User);
	  User = NULL;
	}
      } else {
	/* "Can't" happen */
      }
    } else if(FD_ISSET(sock, &fs)) {  /* Accept a connection */
      if (User == NULL) {
	int len = sizeof(struct sockaddr_un);
	if((user = accept(sock, (struct sockaddr *)(&sa), &len)) >= 0) {
	  fprintf(Log, "%s:  Accepting user connection\n", thedate());
	  if((User = fdopen(user, "w+")) == NULL) {
	    fprintf(Log, "%s:  Can't attach socket to stream\n", thedate());
	  }
	} else {
	  fprintf(Log, "%s:  Failure in attempt to accept connection\n", thedate());
	}
      } else {
	/* "Can't happen */
      }
    }
  }
  /* Not reached */
}

char *thedate()
{
  char *cp, *cp1;
  time_t tod;

  tod = time(NULL);
  cp = cp1 = ctime(&tod);
  while(*cp1 != '\n') cp1++;
  *cp1 = '\0';
  return(cp);
}

/*
 * When SIGHUP received, close and reopen the Log file
 */

void onhup()
{
  char logpath[MAXPATHLEN+1];

  fprintf(Log, "%s:  SIGHUP received, reopening Log\n", thedate());
  fclose(Log);
  strcpy(logpath, X10DIR);
  strcat(logpath, "/");
  strcat(logpath, X10LOGNAME);
  if((Log = fopen(logpath, "a")) == NULL)
    errx(1, "can't open log file '%s'", logpath);
  longjmp(mainloop, 1);
  /* No return */
}

/*
 * When SIGTERM received, just exit normally
 */

void onterm()
{
  fprintf(Log, "%s:  SIGTERM received, shutting down\n", thedate());
  fclose(Log);
  exit(0);
}

/*
 * When SIGPIPE received, reset user connection
 */

void onpipe()
{
  fprintf(Log, "%s:  SIGPIPE received, resetting user connection\n",
	  thedate());
  if(User != NULL) {
    fclose(User);
    User = NULL;
  }
  longjmp(mainloop, 1);
  /* No return */
}
OpenPOWER on IntegriCloud