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apmd.c revision 1.18 
      1 /*	$NetBSD: apmd.c,v 1.18 2001/02/19 23:22:42 cgd 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 <machine/apmvar.h>
     58 #include <err.h>
     59 #include "pathnames.h"
     60 #include "apm-proto.h"
     61 
     62 #define MAX(a,b) (a > b ? a : b)
     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     if (ioctl(fd, APM_IOC_GETPOWER, &bstate) == 0) {
    110 	/* various conditions under which we report status:  something changed
    111 	   enough since last report, or asked to force a print */
    112 	if (bstate.ac_state == APM_AC_ON)
    113 	    acon = 1;
    114 	if (bstate.battery_state != last.battery_state  &&
    115 	    bstate.battery_state == APM_BATT_LOW)
    116 		lowbattnow = 1;
    117 	if (force ||
    118 	    bstate.ac_state != last.ac_state ||
    119 	    bstate.battery_state != last.battery_state ||
    120 	    (bstate.minutes_left && bstate.minutes_left < 15) ||
    121 	    abs(bstate.battery_life - last.battery_life) > 20) {
    122 	    if (verbose) {
    123 		if (bstate.minutes_left)
    124 		    syslog(LOG_NOTICE,
    125 		           "battery status: %s. external power status: %s. "
    126 		           "estimated battery life %d%% (%d minutes)",
    127 		           battstate(bstate.battery_state),
    128 		           ac_state(bstate.ac_state), bstate.battery_life,
    129 		           bstate.minutes_left);
    130 		else
    131 		    syslog(LOG_NOTICE,
    132 		           "battery status: %s. external power status: %s. "
    133 		           "estimated battery life %d%%",
    134 		           battstate(bstate.battery_state),
    135 		           ac_state(bstate.ac_state), bstate.battery_life);
    136 	    }
    137 	    last = bstate;
    138 	}
    139 	if (pinfo)
    140 	    *pinfo = bstate;
    141     } else
    142 	syslog(LOG_ERR, "cannot fetch power status: %m");
    143     return ((acon?POWER_STATUS_ACON:0) |
    144 	(lowbattnow?POWER_STATUS_LOWBATTNOW:0));
    145 }
    146 
    147 static char *socketname;
    148 
    149 static void sockunlink(void);
    150 
    151 static void
    152 sockunlink(void)
    153 {
    154     if (socketname)
    155 	(void) remove(socketname);
    156 }
    157 
    158 int
    159 bind_socket(const char *sockname, mode_t mode, uid_t uid, gid_t gid)
    160 {
    161     int sock;
    162     struct sockaddr_un s_un;
    163 
    164     sock = socket(AF_LOCAL, SOCK_STREAM, 0);
    165     if (sock == -1)
    166 	err(1, "cannot create local socket");
    167 
    168     s_un.sun_family = AF_LOCAL;
    169     strncpy(s_un.sun_path, sockname, sizeof(s_un.sun_path));
    170     s_un.sun_len = SUN_LEN(&s_un);
    171     /* remove it if present, we're moving in */
    172     (void) remove(sockname);
    173     if (bind(sock, (struct sockaddr *)&s_un, s_un.sun_len) == -1)
    174 	err(1, "cannot create APM socket");
    175     if (chmod(sockname, mode) == -1 || chown(sockname, uid, gid) == -1)
    176 	err(1, "cannot set socket mode/owner/group to %o/%d/%d",
    177 	    mode, uid, gid);
    178     listen(sock, 1);
    179     socketname = strdup(sockname);
    180     atexit(sockunlink);
    181     return sock;
    182 }
    183 
    184 enum apm_state
    185 handle_client(int sock_fd, int ctl_fd)
    186 {
    187     /* accept a handle from the client, process it, then clean up */
    188     int cli_fd;
    189     struct sockaddr_un from;
    190     int fromlen = sizeof(from);
    191     struct apm_command cmd;
    192     struct apm_reply reply;
    193 
    194     cli_fd = accept(sock_fd, (struct sockaddr *)&from, &fromlen);
    195     if (cli_fd == -1) {
    196 	syslog(LOG_INFO, "client accept failure: %m");
    197 	return NORMAL;
    198     }
    199     if (recv(cli_fd, &cmd, sizeof(cmd), 0) != sizeof(cmd)) {
    200 	(void) close(cli_fd);
    201 	syslog(LOG_INFO, "client size botch");
    202 	return NORMAL;
    203     }
    204     if (cmd.vno != APMD_VNO) {
    205 	close(cli_fd);			/* terminate client */
    206 	/* no error message, just drop it. */
    207 	return NORMAL;
    208     }
    209     power_status(ctl_fd, 0, &reply.batterystate);
    210     switch (cmd.action) {
    211     default:
    212 	reply.newstate = NORMAL;
    213 	break;
    214     case SUSPEND:
    215 	reply.newstate = SUSPENDING;
    216 	break;
    217     case STANDBY:
    218 	reply.newstate = STANDING_BY;
    219 	break;
    220     }
    221     reply.vno = APMD_VNO;
    222     if (send(cli_fd, &reply, sizeof(reply), 0) != sizeof(reply)) {
    223 	syslog(LOG_INFO, "client reply botch");
    224     }
    225     close(cli_fd);
    226     return reply.newstate;
    227 }
    228 
    229 static int speaker_ok = TRUE;
    230 
    231 void
    232 make_noise(howmany)
    233 int howmany;
    234 {
    235     int spkrfd;
    236     int trycnt;
    237 
    238     if (!speaker_ok)		/* don't bother after sticky errors */
    239 	return;
    240 
    241     for (trycnt = 0; trycnt < 3; trycnt++) {
    242 	spkrfd = open(_PATH_DEV_SPEAKER, O_WRONLY);
    243 	if (spkrfd == -1) {
    244 	    switch (errno) {
    245 	    case EBUSY:
    246 		usleep(500000);
    247 		errno = EBUSY;
    248 		continue;
    249 	    case ENOENT:
    250 	    case ENODEV:
    251 	    case ENXIO:
    252 	    case EPERM:
    253 	    case EACCES:
    254 		syslog(LOG_INFO,
    255 		       "speaker device " _PATH_DEV_SPEAKER " unavailable: %m");
    256 		speaker_ok = FALSE;
    257 		return;
    258 	    }
    259 	} else
    260 	    break;
    261     }
    262     if (spkrfd == -1) {
    263 	syslog(LOG_WARNING, "cannot open " _PATH_DEV_SPEAKER ": %m");
    264 	return;
    265     }
    266     syslog(LOG_DEBUG, "sending %d tones to speaker\n", howmany);
    267     write (spkrfd, "o4cc", 2 + howmany);
    268     close(spkrfd);
    269     return;
    270 }
    271 
    272 
    273 void
    274 suspend(int ctl_fd)
    275 {
    276     do_etc_file(_PATH_APM_ETC_SUSPEND);
    277     sync();
    278     make_noise(2);
    279     sync();
    280     sync();
    281     sleep(1);
    282     ioctl(ctl_fd, APM_IOC_SUSPEND, 0);
    283 }
    284 
    285 void
    286 stand_by(int ctl_fd)
    287 {
    288     do_etc_file(_PATH_APM_ETC_STANDBY);
    289     sync();
    290     make_noise(1);
    291     sync();
    292     sync();
    293     sleep(1);
    294     ioctl(ctl_fd, APM_IOC_STANDBY, 0);
    295 }
    296 
    297 #define TIMO (10*60)			/* 10 minutes */
    298 
    299 void
    300 resume(int ctl_fd)
    301 {
    302     do_etc_file(_PATH_APM_ETC_RESUME);
    303 }
    304 
    305 int
    306 main(int argc, char *argv[])
    307 {
    308     const char *fname = apmdev;
    309     int ctl_fd, sock_fd, ch, ready;
    310     int statonly = 0;
    311     fd_set devfds;
    312     fd_set selcopy;
    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     struct timeval tv = {TIMO, 0}, stv;
    320     const char *sockname = sockfile;
    321     char *user, *group;
    322     char *scratch;
    323     uid_t uid = 0;
    324     gid_t gid = 0;
    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 	    tv.tv_sec = strtoul(optarg, 0, 0);
    353 	    if (tv.tv_sec == 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 ((ctl_fd = open(fname, O_RDWR)) == -1) {
    399 	(void)err(1, "cannot open device file `%s'", fname);
    400     }
    401     if (debug) {
    402 	openlog("apmd", 0, LOG_LOCAL1);
    403     } else {
    404 	openlog("apmd", 0, LOG_DAEMON);
    405 	setlogmask(LOG_UPTO(LOG_NOTICE));
    406 	daemon(0, 0);
    407 	pidfile(NULL);
    408     }
    409     if (statonly) {
    410         power_status(ctl_fd, 1, 0);
    411 	exit(0);
    412     } else {
    413 	struct apm_power_info pinfo;
    414 	power_status(ctl_fd, 1, &pinfo);
    415 	do_ac_state(pinfo.ac_state);
    416 	ac_is_off = (pinfo.ac_state == APM_AC_OFF);
    417     }
    418 
    419     (void) signal(SIGTERM, sigexit);
    420     (void) signal(SIGHUP, sigexit);
    421     (void) signal(SIGINT, sigexit);
    422     (void) signal(SIGPIPE, SIG_IGN);
    423 
    424 
    425     sock_fd = bind_socket(sockname, mode, uid, gid);
    426 
    427     FD_ZERO(&devfds);
    428     FD_SET(ctl_fd, &devfds);
    429     FD_SET(sock_fd, &devfds);
    430 
    431 
    432 
    433     for (selcopy = devfds, errno = 0, stv = tv;
    434 	 (ready = select(MAX(ctl_fd,sock_fd)+1, &selcopy, 0, 0, &stv)) >= 0 ||
    435 	     errno == EINTR;
    436 	 selcopy = devfds, errno = 0, stv = tv) {
    437 	if (errno == EINTR)
    438 	    continue;
    439 	if (ready == 0) {
    440 		int status;
    441 		/* wakeup for timeout: take status */
    442 		status = power_status(ctl_fd, 0, 0);
    443 		if (lowbattsleep && status&POWER_STATUS_LOWBATTNOW) {
    444 			if (noacsleep && status&POWER_STATUS_ACON) {
    445 				if (debug)
    446 					syslog(LOG_DEBUG,
    447 					    "not sleeping because "
    448 					    "AC is connected");
    449 			} else
    450 				suspend(ctl_fd);
    451 		}
    452 	}
    453 	if (FD_ISSET(ctl_fd, &selcopy)) {
    454 	    suspends = standbys = resumes = 0;
    455 	    while (ioctl(ctl_fd, APM_IOC_NEXTEVENT, &apmevent) == 0) {
    456 		if (debug)
    457 		    syslog(LOG_DEBUG, "apmevent %04x index %d", apmevent.type,
    458 		           apmevent.index);
    459 		switch (apmevent.type) {
    460 		case APM_SUSPEND_REQ:
    461 		case APM_USER_SUSPEND_REQ:
    462 		case APM_CRIT_SUSPEND_REQ:
    463 		    suspends++;
    464 		    break;
    465 		case APM_BATTERY_LOW:
    466 		    if (lowbattsleep)
    467 			suspends++;
    468 		    break;
    469 		case APM_USER_STANDBY_REQ:
    470 		case APM_STANDBY_REQ:
    471 		    standbys++;
    472 		    break;
    473 #if 0
    474 		case APM_CANCEL:
    475 		    suspends = standbys = 0;
    476 		    break;
    477 #endif
    478 		case APM_NORMAL_RESUME:
    479 		case APM_CRIT_RESUME:
    480 		case APM_SYS_STANDBY_RESUME:
    481 		    resumes++;
    482 		    break;
    483 		case APM_POWER_CHANGE:
    484 		{
    485 		    struct apm_power_info pinfo;
    486 		    power_status(ctl_fd, 0, &pinfo);
    487 		    /* power status can change without ac status changing */
    488 		    if (ac_is_off != (pinfo.ac_state == APM_AC_OFF)) {
    489 		    	do_ac_state(pinfo.ac_state);
    490 			ac_is_off = (pinfo.ac_state == APM_AC_OFF);
    491 		    }
    492 		    break;
    493 		}
    494 		default:
    495 		    break;
    496 		}
    497 	    }
    498 	    if ((standbys || suspends) && noacsleep &&
    499 		(power_status(ctl_fd, 0, 0) & POWER_STATUS_ACON)) {
    500 		if (debug)
    501 		    syslog(LOG_DEBUG, "not sleeping because AC is connected");
    502 	    } else if (suspends) {
    503 		suspend(ctl_fd);
    504 	    } else if (standbys) {
    505 		stand_by(ctl_fd);
    506 	    } else if (resumes) {
    507 		resume(ctl_fd);
    508 		if (verbose)
    509 		    syslog(LOG_NOTICE, "system resumed from APM sleep");
    510 	    }
    511 	    ready--;
    512 	}
    513 	if (ready == 0)
    514 	    continue;
    515 	if (FD_ISSET(sock_fd, &selcopy)) {
    516 	    switch (handle_client(sock_fd, ctl_fd)) {
    517 	    case NORMAL:
    518 		break;
    519 	    case SUSPENDING:
    520 		suspend(ctl_fd);
    521 		break;
    522 	    case STANDING_BY:
    523 		stand_by(ctl_fd);
    524 		break;
    525 	    }
    526 	}
    527     }
    528     syslog(LOG_ERR, "select failed: %m");
    529     exit(1);
    530 }
    531 
    532 void
    533 do_etc_file(const char *file)
    534 {
    535     pid_t pid;
    536     int status;
    537     const char *prog;
    538 
    539     /* If file doesn't exist, do nothing. */
    540     if (access(file, X_OK|R_OK)) {
    541 	if (debug)
    542 	    syslog(LOG_DEBUG, "do_etc_file(): cannot access file %s", file);
    543 	return;
    544     }
    545 
    546     prog = strrchr(file, '/');
    547     if (prog)
    548 	prog++;
    549     else
    550 	prog = file;
    551 
    552     pid = fork();
    553     switch (pid) {
    554     case -1:
    555 	syslog(LOG_ERR, "failed to fork(): %m");
    556 	return;
    557     case 0:
    558 	/* We are the child. */
    559 	execl(file, prog, NULL);
    560 	_exit(-1);
    561 	/* NOTREACHED */
    562     default:
    563 	/* We are the parent. */
    564 	wait4(pid, &status, 0, 0);
    565 	if (WIFEXITED(status)) {
    566 	    if (debug)
    567 		syslog(LOG_DEBUG, "%s exited with status %d", file,
    568 		       WEXITSTATUS(status));
    569 	} else
    570 	    syslog(LOG_ERR, "%s exited abnormally.", file);
    571 	break;
    572     }
    573 }
    574 
    575 void
    576 do_ac_state(int state)
    577 {
    578 	switch (state) {
    579 	case APM_AC_OFF:
    580 		do_etc_file(_PATH_APM_ETC_BATTERY);
    581 		break;
    582 	case APM_AC_ON:
    583 	case APM_AC_BACKUP:
    584 		do_etc_file(_PATH_APM_ETC_LINE);
    585 		break;
    586 	default:
    587 		/* Silently ignore */
    588 	}
    589 }
    590