| 1 | /*- |
| 2 | * Copyright (c) 1992, 1993, 1995 Eugene W. Stark |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by Eugene W. Stark. |
| 16 | * 4. The name of the author may not be used to endorse or promote products |
| 17 | * derived from this software without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY EUGENE W. STARK (THE AUTHOR) ``AS IS'' AND |
| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
| 23 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 24 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 25 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 | * SUCH DAMAGE. |
| 30 | * |
| 31 | * $FreeBSD: src/libexec/xtend/xtend.c,v 1.9 1999/08/28 00:10:31 peter Exp $ |
| 32 | * $DragonFly: src/libexec/xtend/xtend.c,v 1.3 2003/11/14 03:54:32 dillon Exp $ |
| 33 | */ |
| 34 | |
| 35 | /* |
| 36 | * xtend - X-10 daemon |
| 37 | * Eugene W. Stark (stark@cs.sunysb.edu) |
| 38 | * January 14, 1993 |
| 39 | */ |
| 40 | |
| 41 | #include <err.h> |
| 42 | #include <pwd.h> |
| 43 | #include <setjmp.h> |
| 44 | #include <signal.h> |
| 45 | #include <stdio.h> |
| 46 | #include <stdlib.h> |
| 47 | #include <string.h> |
| 48 | #include <time.h> |
| 49 | #include <unistd.h> |
| 50 | #include <sys/param.h> |
| 51 | #include <sys/file.h> |
| 52 | #include <sys/types.h> |
| 53 | #include <sys/time.h> |
| 54 | #include <sys/stat.h> |
| 55 | #include <sys/errno.h> |
| 56 | #include <sys/ioctl.h> |
| 57 | #include <sys/socket.h> |
| 58 | #include <sys/un.h> |
| 59 | #include <grp.h> |
| 60 | |
| 61 | #include "xtend.h" |
| 62 | #include "xten.h" |
| 63 | #include "paths.h" |
| 64 | |
| 65 | FILE *Log; /* Log file */ |
| 66 | FILE *User; /* User connection */ |
| 67 | STATUS Status[16][16]; /* Device status table */ |
| 68 | int status; /* Status file descriptor */ |
| 69 | int tw523; /* tw523 controller */ |
| 70 | int sock; /* socket for user */ |
| 71 | jmp_buf mainloop; /* longjmp point after SIGHUP */ |
| 72 | void onhup(); /* SIGHUP handler */ |
| 73 | void onterm(); /* SIGTERM handler */ |
| 74 | void onpipe(); /* SIGPIPE handler */ |
| 75 | |
| 76 | void checkpoint_status (void); |
| 77 | void initstatus (void); |
| 78 | void logpacket (unsigned char *); |
| 79 | void processpacket (unsigned char *); |
| 80 | int user_command (void); |
| 81 | |
| 82 | int |
| 83 | main(argc, argv) |
| 84 | int argc; |
| 85 | char *argv[]; |
| 86 | { |
| 87 | char *twpath = TWPATH; |
| 88 | char *sockpath = SOCKPATH; |
| 89 | char logpath[MAXPATHLEN+1]; |
| 90 | char statpath[MAXPATHLEN+1]; |
| 91 | struct sockaddr_un sa; |
| 92 | struct timeval tv; |
| 93 | struct passwd *pw; |
| 94 | struct group *gr; |
| 95 | struct stat sb; |
| 96 | int user; |
| 97 | FILE *pidf; |
| 98 | |
| 99 | /* |
| 100 | * Make sure we start out running as root |
| 101 | */ |
| 102 | if(geteuid() != 0) |
| 103 | errx(1, "you must be root"); |
| 104 | |
| 105 | /* |
| 106 | * Find out what UID/GID we are to run as |
| 107 | */ |
| 108 | if((pw = getpwnam(XTENUNAME)) == NULL) |
| 109 | errx(1, "no such user '%s'", XTENUNAME); |
| 110 | if((gr = getgrnam(XTENGNAME)) == NULL) |
| 111 | errx(1, "no such group '%s'", XTENGNAME); |
| 112 | |
| 113 | /* |
| 114 | * Open the log file before doing anything else |
| 115 | */ |
| 116 | strcpy(logpath, X10DIR); |
| 117 | if(stat(logpath, &sb) == -1 && errno == ENOENT) { |
| 118 | if(mkdir(logpath, 0755) != -1) { |
| 119 | chown(logpath, pw->pw_uid, gr->gr_gid); |
| 120 | } else { |
| 121 | errx(1, "can't create directory '%s'", logpath); |
| 122 | } |
| 123 | } |
| 124 | strcat(logpath, "/"); |
| 125 | strcat(logpath, X10LOGNAME); |
| 126 | if((Log = fopen(logpath, "a")) == NULL) |
| 127 | errx(1, "can't open log file '%s'", logpath); |
| 128 | chown(logpath, pw->pw_uid, gr->gr_gid); |
| 129 | |
| 130 | /* |
| 131 | * Become a daemon |
| 132 | */ |
| 133 | if(daemon(0, 0) == -1) { |
| 134 | fprintf(Log, "%s: Unable to become a daemon\n", thedate()); |
| 135 | fclose(Log); |
| 136 | exit(1); |
| 137 | } |
| 138 | fprintf(Log, "%s: %s [%d] started\n", thedate(), argv[0], getpid()); |
| 139 | |
| 140 | /* |
| 141 | * Get ahold of the TW523 device |
| 142 | */ |
| 143 | if((tw523 = open(twpath, O_RDWR)) < 0) { |
| 144 | fprintf(Log, "%s: Can't open %s\n", thedate(), twpath); |
| 145 | fclose(Log); |
| 146 | exit(1); |
| 147 | } |
| 148 | fprintf(Log, "%s: %s successfully opened\n", thedate(), twpath); |
| 149 | |
| 150 | /* |
| 151 | * Put our pid in a file so we can be signalled by shell scripts |
| 152 | */ |
| 153 | if((pidf = fopen(PIDPATH, "w")) == NULL) { |
| 154 | fprintf(Log, "%s: Error writing pid file: %s\n", thedate(), PIDPATH); |
| 155 | fclose(Log); |
| 156 | exit(1); |
| 157 | } |
| 158 | fprintf(pidf, "%d\n", getpid()); |
| 159 | fclose(pidf); |
| 160 | |
| 161 | /* |
| 162 | * Set up socket to accept user commands |
| 163 | */ |
| 164 | if((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { |
| 165 | fprintf(Log, "%s: Can't create socket\n", thedate()); |
| 166 | fclose(Log); |
| 167 | exit(1); |
| 168 | } |
| 169 | strcpy(sa.sun_path, sockpath); |
| 170 | sa.sun_family = AF_UNIX; |
| 171 | unlink(sockpath); |
| 172 | if(bind(sock, (struct sockaddr *)(&sa), strlen(sa.sun_path) + 2) < 0) { |
| 173 | fprintf(Log, "%s: Can't bind socket to %s\n", thedate(), sockpath); |
| 174 | fclose(Log); |
| 175 | exit(1); |
| 176 | } |
| 177 | if(listen(sock, 5) < 0) { |
| 178 | fprintf(Log, "%s: Can't listen on socket\n", thedate()); |
| 179 | fclose(Log); |
| 180 | exit(1); |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * Set proper ownership and permissions on the socket |
| 185 | */ |
| 186 | if(chown(sockpath, pw->pw_uid, gr->gr_gid) == -1 || |
| 187 | chmod(sockpath, 0660) == -1) { |
| 188 | fprintf(Log, "%s: Can't set owner/permissions on socket\n", thedate()); |
| 189 | fclose(Log); |
| 190 | exit(1); |
| 191 | } |
| 192 | |
| 193 | /* |
| 194 | * Give up root privileges |
| 195 | */ |
| 196 | setgid(pw->pw_gid); |
| 197 | setuid(pw->pw_uid); |
| 198 | |
| 199 | /* |
| 200 | * Initialize the status table |
| 201 | */ |
| 202 | strcpy(statpath, X10DIR); |
| 203 | strcat(statpath, "/"); |
| 204 | strcat(statpath, X10STATNAME); |
| 205 | if((status = open(statpath, O_RDWR)) < 0) { |
| 206 | if((status = open(statpath, O_RDWR | O_CREAT, 0666)) < 0) { |
| 207 | fprintf(Log, "%s: Can't open %s\n", thedate(), statpath); |
| 208 | fclose(Log); |
| 209 | exit(1); |
| 210 | } |
| 211 | if(write(status, Status, 16 * 16 * sizeof(STATUS)) |
| 212 | != 16 * 16 * sizeof(STATUS)) { |
| 213 | fprintf(Log, "%s: Error initializing status file\n", thedate()); |
| 214 | fclose(Log); |
| 215 | exit(1); |
| 216 | } |
| 217 | } |
| 218 | initstatus(); |
| 219 | |
| 220 | /* |
| 221 | * Return here on SIGHUP after closing and reopening log file. |
| 222 | * Also on SIGPIPE after closing user connection. |
| 223 | */ |
| 224 | signal(SIGTERM, onterm); |
| 225 | signal(SIGHUP, onhup); |
| 226 | signal(SIGPIPE, onpipe); |
| 227 | setjmp(mainloop); |
| 228 | |
| 229 | /* |
| 230 | * Now start the main processing loop. |
| 231 | */ |
| 232 | tv.tv_sec = 0; |
| 233 | tv.tv_usec = 250000; |
| 234 | while(1) { |
| 235 | fd_set fs; |
| 236 | unsigned char rpkt[3]; |
| 237 | int sel, h, k; |
| 238 | STATUS *s; |
| 239 | |
| 240 | FD_ZERO(&fs); |
| 241 | FD_SET(tw523, &fs); |
| 242 | if(User != NULL) FD_SET(user, &fs); |
| 243 | else FD_SET(sock, &fs); |
| 244 | sel = select(FD_SETSIZE, &fs, 0, 0, &tv); |
| 245 | if(sel == 0) { |
| 246 | /* |
| 247 | * Cancel brightening and dimming on ALL units on ALL house codes, |
| 248 | * because the fact that we haven't gotten a packet for awhile means |
| 249 | * that there was a gap in transmission. |
| 250 | */ |
| 251 | for(h = 0; h < 16; h++) { |
| 252 | for(k = 0; k < 16; k++) { |
| 253 | s = &Status[h][k]; |
| 254 | if(s->selected == BRIGHTENING || s->selected == DIMMING) { |
| 255 | s->selected = IDLE; |
| 256 | s->lastchange = time(NULL); |
| 257 | s->changed = 1; |
| 258 | } |
| 259 | } |
| 260 | } |
| 261 | fflush(Log); |
| 262 | checkpoint_status(); |
| 263 | /* |
| 264 | * Now that we've done this stuff, we'll set the timeout a little |
| 265 | * longer, so we don't keep looping too frequently. |
| 266 | */ |
| 267 | tv.tv_sec = 60; |
| 268 | tv.tv_usec = 0; |
| 269 | continue; |
| 270 | } |
| 271 | /* |
| 272 | * While there is stuff happening, we keep a short timeout, so we |
| 273 | * don't get stuck for some unknown reason, and so we can keep the |
| 274 | * brightening and dimming data up-to-date. |
| 275 | */ |
| 276 | tv.tv_sec = 0; |
| 277 | tv.tv_usec = 250000; |
| 278 | if(FD_ISSET(tw523, &fs)) { /* X10 data arriving from TW523 */ |
| 279 | if(read(tw523, rpkt, 3) < 3) { |
| 280 | fprintf(Log, "%s: Error reading from TW523\n", thedate()); |
| 281 | } else { |
| 282 | logpacket(rpkt); |
| 283 | processpacket(rpkt); |
| 284 | } |
| 285 | } else if(FD_ISSET(user, &fs) && User != NULL) { |
| 286 | if(user_command()) { |
| 287 | fprintf(Log, "%s: Closing user connection\n", thedate()); |
| 288 | fclose(User); |
| 289 | User = NULL; |
| 290 | } |
| 291 | } else if(FD_ISSET(sock, &fs)) { /* Accept a connection */ |
| 292 | if (User == NULL) { |
| 293 | int len = sizeof(struct sockaddr_un); |
| 294 | if((user = accept(sock, (struct sockaddr *)(&sa), &len)) >= 0) { |
| 295 | fprintf(Log, "%s: Accepting user connection\n", thedate()); |
| 296 | if((User = fdopen(user, "w+")) == NULL) { |
| 297 | fprintf(Log, "%s: Can't attach socket to stream\n", thedate()); |
| 298 | } |
| 299 | } else { |
| 300 | fprintf(Log, "%s: Failure in attempt to accept connection\n", thedate()); |
| 301 | } |
| 302 | } else { |
| 303 | /* "Can't happen */ |
| 304 | } |
| 305 | } |
| 306 | } |
| 307 | /* Not reached */ |
| 308 | } |
| 309 | |
| 310 | char *thedate() |
| 311 | { |
| 312 | char *cp, *cp1; |
| 313 | time_t tod; |
| 314 | |
| 315 | tod = time(NULL); |
| 316 | cp = cp1 = ctime(&tod); |
| 317 | while(*cp1 != '\n') cp1++; |
| 318 | *cp1 = '\0'; |
| 319 | return(cp); |
| 320 | } |
| 321 | |
| 322 | /* |
| 323 | * When SIGHUP received, close and reopen the Log file |
| 324 | */ |
| 325 | |
| 326 | void onhup() |
| 327 | { |
| 328 | char logpath[MAXPATHLEN+1]; |
| 329 | |
| 330 | fprintf(Log, "%s: SIGHUP received, reopening Log\n", thedate()); |
| 331 | fclose(Log); |
| 332 | strcpy(logpath, X10DIR); |
| 333 | strcat(logpath, "/"); |
| 334 | strcat(logpath, X10LOGNAME); |
| 335 | if((Log = fopen(logpath, "a")) == NULL) |
| 336 | errx(1, "can't open log file '%s'", logpath); |
| 337 | longjmp(mainloop, 1); |
| 338 | /* No return */ |
| 339 | } |
| 340 | |
| 341 | /* |
| 342 | * When SIGTERM received, just exit normally |
| 343 | */ |
| 344 | |
| 345 | void onterm() |
| 346 | { |
| 347 | fprintf(Log, "%s: SIGTERM received, shutting down\n", thedate()); |
| 348 | fclose(Log); |
| 349 | exit(0); |
| 350 | } |
| 351 | |
| 352 | /* |
| 353 | * When SIGPIPE received, reset user connection |
| 354 | */ |
| 355 | |
| 356 | void onpipe() |
| 357 | { |
| 358 | fprintf(Log, "%s: SIGPIPE received, resetting user connection\n", |
| 359 | thedate()); |
| 360 | if(User != NULL) { |
| 361 | fclose(User); |
| 362 | User = NULL; |
| 363 | } |
| 364 | longjmp(mainloop, 1); |
| 365 | /* No return */ |
| 366 | } |