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apmd.c revision 1.30 
      1 /*	$NetBSD: apmd.c,v 1.30 2006/10/07 17:27:57 elad Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996, 2000 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by John Kohl.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <stdio.h>
     40 #include <errno.h>
     41 #include <syslog.h>
     42 #include <fcntl.h>
     43 #include <unistd.h>
     44 #include <util.h>
     45 #include <stdlib.h>
     46 #include <string.h>
     47 #include <signal.h>
     48 #include <sys/types.h>
     49 #include <pwd.h>
     50 #include <grp.h>
     51 #include <sys/stat.h>
     52 #include <sys/ioctl.h>
     53 #include <sys/time.h>
     54 #include <sys/socket.h>
     55 #include <sys/un.h>
     56 #include <sys/wait.h>
     57 #include <poll.h>
     58 #include <machine/apmvar.h>
     59 #include <err.h>
     60 #include "pathnames.h"
     61 #include "apm-proto.h"
     62 
     63 #define TRUE 1
     64 #define FALSE 0
     65 
     66 #define POWER_STATUS_ACON	0x1
     67 #define POWER_STATUS_LOWBATTNOW	0x2
     68 
     69 const char apmdev[] = _PATH_APM_CTLDEV;
     70 const char sockfile[] = _PATH_APM_SOCKET;
     71 
     72 static int debug = 0;
     73 static int verbose = 0;
     74 
     75 void usage (void);
     76 int power_status (int fd, int force, struct apm_power_info *pinfo);
     77 int bind_socket (const char *sn, mode_t mode, uid_t uid, gid_t gid);
     78 enum apm_state handle_client(int sock_fd, int ctl_fd);
     79 void suspend(int ctl_fd);
     80 void stand_by(int ctl_fd);
     81 void resume(int ctl_fd);
     82 void sigexit(int signo);
     83 void make_noise(int howmany);
     84 void do_etc_file(const char *file);
     85 void do_ac_state(int state);
     86 
     87 void
     88 sigexit(int signo)
     89 {
     90     exit(1);
     91 }
     92 
     93 void
     94 usage(void)
     95 {
     96     fprintf(stderr,"usage: %s [-adlqsv] [-t seconds] [-S sockname]\n\t[-m sockmode] [-o sockowner:sockgroup] [-f devname]\n", getprogname());
     97     exit(1);
     98 }
     99 
    100 
    101 int
    102 power_status(int fd, int force, struct apm_power_info *pinfo)
    103 {
    104     struct apm_power_info bstate;
    105     static struct apm_power_info last;
    106     int acon = 0;
    107     int lowbattnow = 0;
    108 
    109     memset(&bstate, 0, sizeof(bstate));
    110     if (ioctl(fd, APM_IOC_GETPOWER, &bstate) == 0) {
    111 	/* various conditions under which we report status:  something changed
    112 	   enough since last report, or asked to force a print */
    113 	if (bstate.ac_state == APM_AC_ON)
    114 	    acon = 1;
    115 	if (bstate.battery_state != last.battery_state  &&
    116 	    bstate.battery_state == APM_BATT_LOW)
    117 		lowbattnow = 1;
    118 	if (force ||
    119 	    bstate.ac_state != last.ac_state ||
    120 	    bstate.battery_state != last.battery_state ||
    121 	    (bstate.minutes_left && bstate.minutes_left < 15) ||
    122 	    abs(bstate.battery_life - last.battery_life) > 20) {
    123 	    if (verbose) {
    124 		if (bstate.minutes_left)
    125 		    syslog(LOG_NOTICE,
    126 		           "battery status: %s. external power status: %s. "
    127 		           "estimated battery life %d%% (%d minutes)",
    128 		           battstate(bstate.battery_state),
    129 		           ac_state(bstate.ac_state), bstate.battery_life,
    130 		           bstate.minutes_left);
    131 		else
    132 		    syslog(LOG_NOTICE,
    133 		           "battery status: %s. external power status: %s. "
    134 		           "estimated battery life %d%%",
    135 		           battstate(bstate.battery_state),
    136 		           ac_state(bstate.ac_state), bstate.battery_life);
    137 	    }
    138 	    last = bstate;
    139 	}
    140 	if (pinfo)
    141 	    *pinfo = bstate;
    142     } else
    143 	syslog(LOG_ERR, "cannot fetch power status: %m");
    144     return ((acon?POWER_STATUS_ACON:0) |
    145 	(lowbattnow?POWER_STATUS_LOWBATTNOW:0));
    146 }
    147 
    148 static char *socketname;
    149 
    150 static void sockunlink(void);
    151 
    152 static void
    153 sockunlink(void)
    154 {
    155     if (socketname)
    156 	(void) remove(socketname);
    157 }
    158 
    159 int
    160 bind_socket(const char *sockname, mode_t mode, uid_t uid, gid_t gid)
    161 {
    162     int sock;
    163     struct sockaddr_un s_un;
    164 
    165     sock = socket(AF_LOCAL, SOCK_STREAM, 0);
    166     if (sock == -1)
    167 	err(1, "cannot create local socket");
    168 
    169     s_un.sun_family = AF_LOCAL;
    170     strncpy(s_un.sun_path, sockname, sizeof(s_un.sun_path));
    171     s_un.sun_len = SUN_LEN(&s_un);
    172     /* remove it if present, we're moving in */
    173     (void) remove(sockname);
    174     if (bind(sock, (struct sockaddr *)&s_un, s_un.sun_len) == -1)
    175 	err(1, "cannot create APM socket");
    176     if (chmod(sockname, mode) == -1 || chown(sockname, uid, gid) == -1)
    177 	err(1, "cannot set socket mode/owner/group to %o/%d/%d",
    178 	    mode, uid, gid);
    179     listen(sock, 1);
    180     socketname = strdup(sockname);
    181     atexit(sockunlink);
    182     return sock;
    183 }
    184 
    185 enum apm_state
    186 handle_client(int sock_fd, int ctl_fd)
    187 {
    188     /* accept a handle from the client, process it, then clean up */
    189     int cli_fd;
    190     struct sockaddr_un from;
    191     socklen_t fromlen = sizeof(from);
    192     struct apm_command cmd;
    193     struct apm_reply reply;
    194 
    195     cli_fd = accept(sock_fd, (struct sockaddr *)&from, &fromlen);
    196     if (cli_fd == -1) {
    197 	syslog(LOG_INFO, "client accept failure: %m");
    198 	return NORMAL;
    199     }
    200     if (recv(cli_fd, &cmd, sizeof(cmd), 0) != sizeof(cmd)) {
    201 	(void) close(cli_fd);
    202 	syslog(LOG_INFO, "client size botch");
    203 	return NORMAL;
    204     }
    205     if (cmd.vno != APMD_VNO) {
    206 	close(cli_fd);			/* terminate client */
    207 	/* no error message, just drop it. */
    208 	return NORMAL;
    209     }
    210     power_status(ctl_fd, 0, &reply.batterystate);
    211     switch (cmd.action) {
    212     default:
    213 	reply.newstate = NORMAL;
    214 	break;
    215     case SUSPEND:
    216 	reply.newstate = SUSPENDING;
    217 	break;
    218     case STANDBY:
    219 	reply.newstate = STANDING_BY;
    220 	break;
    221     }
    222     reply.vno = APMD_VNO;
    223     if (send(cli_fd, &reply, sizeof(reply), 0) != sizeof(reply)) {
    224 	syslog(LOG_INFO, "client reply botch");
    225     }
    226     close(cli_fd);
    227     return reply.newstate;
    228 }
    229 
    230 static int speaker_ok = TRUE;
    231 
    232 void
    233 make_noise(howmany)
    234 int howmany;
    235 {
    236     int spkrfd;
    237     int trycnt;
    238 
    239     if (!speaker_ok)		/* don't bother after sticky errors */
    240 	return;
    241 
    242     for (trycnt = 0; trycnt < 3; trycnt++) {
    243 	spkrfd = open(_PATH_DEV_SPEAKER, O_WRONLY);
    244 	if (spkrfd == -1) {
    245 	    switch (errno) {
    246 	    case EBUSY:
    247 		usleep(500000);
    248 		errno = EBUSY;
    249 		continue;
    250 	    case ENOENT:
    251 	    case ENODEV:
    252 	    case ENXIO:
    253 	    case EPERM:
    254 	    case EACCES:
    255 		syslog(LOG_INFO,
    256 		       "speaker device " _PATH_DEV_SPEAKER " unavailable: %m");
    257 		speaker_ok = FALSE;
    258 		return;
    259 	    }
    260 	} else
    261 	    break;
    262     }
    263     if (spkrfd == -1) {
    264 	syslog(LOG_WARNING, "cannot open " _PATH_DEV_SPEAKER ": %m");
    265 	return;
    266     }
    267     syslog(LOG_DEBUG, "sending %d tones to speaker\n", howmany);
    268     write (spkrfd, "o4cc", 2 + howmany);
    269     close(spkrfd);
    270     return;
    271 }
    272 
    273 
    274 void
    275 suspend(int ctl_fd)
    276 {
    277     do_etc_file(_PATH_APM_ETC_SUSPEND);
    278     sync();
    279     make_noise(2);
    280     sync();
    281     sync();
    282     sleep(1);
    283     ioctl(ctl_fd, APM_IOC_SUSPEND, 0);
    284 }
    285 
    286 void
    287 stand_by(int ctl_fd)
    288 {
    289     do_etc_file(_PATH_APM_ETC_STANDBY);
    290     sync();
    291     make_noise(1);
    292     sync();
    293     sync();
    294     sleep(1);
    295     ioctl(ctl_fd, APM_IOC_STANDBY, 0);
    296 }
    297 
    298 #define TIMO (10*60)			/* 10 minutes */
    299 
    300 void
    301 resume(int ctl_fd)
    302 {
    303     do_etc_file(_PATH_APM_ETC_RESUME);
    304 }
    305 
    306 int
    307 main(int argc, char *argv[])
    308 {
    309     const char *fname = apmdev;
    310     int ctl_fd, sock_fd, ch, ready;
    311     int statonly = 0;
    312     struct pollfd set[2];
    313     struct apm_event_info apmevent;
    314     int suspends, standbys, resumes;
    315     int ac_is_off;
    316     int noacsleep = 0;
    317     int lowbattsleep = 0;
    318     mode_t mode = 0660;
    319     unsigned long timeout = TIMO;
    320     const char *sockname = sockfile;
    321     char *user, *group;
    322     char *scratch;
    323     uid_t uid = 2; /* operator */
    324     gid_t gid = 5; /* operator */
    325     struct passwd *pw;
    326     struct group *gr;
    327 
    328     while ((ch = getopt(argc, argv, "adlqsvf:t:S:m:o:")) != -1)
    329 	switch(ch) {
    330 	case 'q':
    331 	    speaker_ok = FALSE;
    332 	    break;
    333 	case 'a':
    334 	    noacsleep = 1;
    335 	    break;
    336 	case 'l':
    337 	    lowbattsleep = 1;
    338 	    break;
    339 	case 'd':
    340 	    debug = 1;
    341 	    break;
    342 	case 'v':
    343 	    verbose = 1;
    344 	    break;
    345 	case 'f':
    346 	    fname = optarg;
    347 	    break;
    348 	case 'S':
    349 	    sockname = optarg;
    350 	    break;
    351 	case 't':
    352 	    timeout = strtoul(optarg, 0, 0);
    353 	    if (timeout == 0)
    354 		usage();
    355 	    break;
    356 	case 'm':
    357 	    mode = strtoul(optarg, 0, 8);
    358 	    if (mode == 0)
    359 		usage();
    360 	    break;
    361 	case 'o':
    362 	    /* (user):(group) */
    363 	    user = optarg;
    364 	    group = strchr(user, ':');
    365 	    if (group)
    366 		*group++ = '\0';
    367 	    if (*user) {
    368 		uid = strtoul(user, &scratch, 0);
    369 		if (*scratch != '\0') {
    370 		    pw = getpwnam(user);
    371 		    if (pw)
    372 			uid = pw->pw_uid;
    373 		    else
    374 			errx(1, "user name `%s' unknown", user);
    375 		}
    376 	    }
    377 	    if (group && *group) {
    378 		gid = strtoul(group, &scratch, 0);
    379 		if (*scratch != '\0') {
    380 		    gr = getgrnam(group);
    381 		    if (gr)
    382 			gid = gr->gr_gid;
    383 		    else
    384 			errx(1, "group name `%s' unknown", group);
    385 		}
    386 	    }
    387 	    break;
    388 	case 's':			/* status only */
    389 	    statonly = 1;
    390 	    break;
    391 	case '?':
    392 
    393 	default:
    394 	    usage();
    395 	}
    396     argc -= optind;
    397     argv += optind;
    398     if (debug) {
    399 	openlog("apmd", 0, LOG_LOCAL1);
    400     } else {
    401 	daemon(0, 0);
    402 	openlog("apmd", 0, LOG_DAEMON);
    403 	setlogmask(LOG_UPTO(LOG_NOTICE));
    404 	pidfile(NULL);
    405     }
    406     if ((ctl_fd = open(fname, O_RDWR)) == -1) {
    407 	syslog(LOG_ERR, "cannot open device file `%s'", fname);
    408 	exit(1);
    409     }
    410 
    411     if (statonly) {
    412         power_status(ctl_fd, 1, 0);
    413 	exit(0);
    414     } else {
    415 	struct apm_power_info pinfo;
    416 	power_status(ctl_fd, 1, &pinfo);
    417 	do_ac_state(pinfo.ac_state);
    418 	ac_is_off = (pinfo.ac_state == APM_AC_OFF);
    419     }
    420 
    421     (void) signal(SIGTERM, sigexit);
    422     (void) signal(SIGHUP, sigexit);
    423     (void) signal(SIGINT, sigexit);
    424     (void) signal(SIGPIPE, SIG_IGN);
    425 
    426 
    427     sock_fd = bind_socket(sockname, mode, uid, gid);
    428 
    429     set[0].fd = ctl_fd;
    430     set[0].events = POLLIN;
    431     set[1].fd = sock_fd;
    432     set[1].events = POLLIN;
    433 
    434 
    435     for (errno = 0;
    436 	 (ready = poll(set, 2, timeout * 1000)) >= 0 || errno == EINTR;
    437 	 errno = 0) {
    438 	if (errno == EINTR)
    439 	    continue;
    440 	if (ready == 0) {
    441 		int status;
    442 		/* wakeup for timeout: take status */
    443 		status = power_status(ctl_fd, 0, 0);
    444 		if (lowbattsleep && status&POWER_STATUS_LOWBATTNOW) {
    445 			if (noacsleep && status&POWER_STATUS_ACON) {
    446 				if (debug)
    447 					syslog(LOG_DEBUG,
    448 					    "not sleeping because "
    449 					    "AC is connected");
    450 			} else
    451 				suspend(ctl_fd);
    452 		}
    453 	}
    454 	if (set[0].revents & POLLIN) {
    455 	    suspends = standbys = resumes = 0;
    456 	    while (ioctl(ctl_fd, APM_IOC_NEXTEVENT, &apmevent) == 0) {
    457 		if (debug)
    458 		    syslog(LOG_DEBUG, "apmevent %04x index %d", apmevent.type,
    459 		           apmevent.index);
    460 		switch (apmevent.type) {
    461 		case APM_SUSPEND_REQ:
    462 		case APM_USER_SUSPEND_REQ:
    463 		case APM_CRIT_SUSPEND_REQ:
    464 		    suspends++;
    465 		    break;
    466 		case APM_BATTERY_LOW:
    467 		    if (lowbattsleep)
    468 			suspends++;
    469 		    break;
    470 		case APM_USER_STANDBY_REQ:
    471 		case APM_STANDBY_REQ:
    472 		    standbys++;
    473 		    break;
    474 #if 0
    475 		case APM_CANCEL:
    476 		    suspends = standbys = 0;
    477 		    break;
    478 #endif
    479 		case APM_NORMAL_RESUME:
    480 		case APM_CRIT_RESUME:
    481 		case APM_SYS_STANDBY_RESUME:
    482 		    resumes++;
    483 		    break;
    484 		case APM_POWER_CHANGE:
    485 		{
    486 		    struct apm_power_info pinfo;
    487 		    power_status(ctl_fd, 0, &pinfo);
    488 		    /* power status can change without ac status changing */
    489 		    if (ac_is_off != (pinfo.ac_state == APM_AC_OFF)) {
    490 		    	do_ac_state(pinfo.ac_state);
    491 			ac_is_off = (pinfo.ac_state == APM_AC_OFF);
    492 		    }
    493 		    break;
    494 		}
    495 		default:
    496 		    break;
    497 		}
    498 	    }
    499 	    if ((standbys || suspends) && noacsleep &&
    500 		(power_status(ctl_fd, 0, 0) & POWER_STATUS_ACON)) {
    501 		if (debug)
    502 		    syslog(LOG_DEBUG, "not sleeping because AC is connected");
    503 	    } else if (suspends) {
    504 		suspend(ctl_fd);
    505 	    } else if (standbys) {
    506 		stand_by(ctl_fd);
    507 	    } else if (resumes) {
    508 		resume(ctl_fd);
    509 		if (verbose)
    510 		    syslog(LOG_NOTICE, "system resumed from APM sleep");
    511 	    }
    512 	    ready--;
    513 	}
    514 	if (ready == 0)
    515 	    continue;
    516 	if (set[1].revents & POLLIN) {
    517 	    switch (handle_client(sock_fd, ctl_fd)) {
    518 	    case NORMAL:
    519 		break;
    520 	    case SUSPENDING:
    521 		suspend(ctl_fd);
    522 		break;
    523 	    case STANDING_BY:
    524 		stand_by(ctl_fd);
    525 		break;
    526 	    }
    527 	}
    528     }
    529     syslog(LOG_ERR, "poll failed: %m");
    530     exit(1);
    531 }
    532 
    533 void
    534 do_etc_file(const char *file)
    535 {
    536     pid_t pid;
    537     int status;
    538     const char *prog;
    539 
    540     /* If file doesn't exist, do nothing. */
    541     if (access(file, X_OK|R_OK)) {
    542 	if (debug)
    543 	    syslog(LOG_DEBUG, "do_etc_file(): cannot access file %s", file);
    544 	return;
    545     }
    546 
    547     prog = strrchr(file, '/');
    548     if (prog)
    549 	prog++;
    550     else
    551 	prog = file;
    552 
    553     pid = fork();
    554     switch (pid) {
    555     case -1:
    556 	syslog(LOG_ERR, "failed to fork(): %m");
    557 	return;
    558     case 0:
    559 	/* We are the child. */
    560 	if (execl(file, prog, NULL) == -1)
    561 		syslog(LOG_ERR, "could not execute \"%s\": %m", file);
    562 	_exit(1);
    563 	/* NOTREACHED */
    564     default:
    565 	/* We are the parent. */
    566 	wait4(pid, &status, 0, 0);
    567 	if (WIFEXITED(status)) {
    568 	    if (debug)
    569 		syslog(LOG_DEBUG, "%s exited with status %d", file,
    570 		       WEXITSTATUS(status));
    571 	} else
    572 	    syslog(LOG_ERR, "%s exited abnormally.", file);
    573 	break;
    574     }
    575 }
    576 
    577 void
    578 do_ac_state(int state)
    579 {
    580 	switch (state) {
    581 	case APM_AC_OFF:
    582 		do_etc_file(_PATH_APM_ETC_BATTERY);
    583 		break;
    584 	case APM_AC_ON:
    585 	case APM_AC_BACKUP:
    586 		do_etc_file(_PATH_APM_ETC_LINE);
    587 		break;
    588 	default:
    589 		/* Silently ignore */ ;
    590 	}
    591 }
    592