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usbhidaction.c revision 1.16 
      1 /*      $NetBSD: usbhidaction.c,v 1.16 2004/10/31 21:10:59 augustss Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2000, 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Lennart Augustsson <lennart (at) augustsson.net>.
      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 #include <sys/cdefs.h>
     39 
     40 #ifndef lint
     41 __RCSID("$NetBSD: usbhidaction.c,v 1.16 2004/10/31 21:10:59 augustss Exp $");
     42 #endif
     43 
     44 #include <stdio.h>
     45 #include <stdlib.h>
     46 #include <string.h>
     47 #include <ctype.h>
     48 #include <err.h>
     49 #include <fcntl.h>
     50 #include <limits.h>
     51 #include <unistd.h>
     52 #include <sys/types.h>
     53 #include <sys/ioctl.h>
     54 #include <dev/usb/usb.h>
     55 #include <dev/usb/usbhid.h>
     56 #include <usbhid.h>
     57 #include <util.h>
     58 #include <syslog.h>
     59 #include <signal.h>
     60 
     61 int verbose = 0;
     62 int isdemon = 0;
     63 int reparse = 0;
     64 
     65 struct command {
     66 	struct command *next;
     67 	int line;
     68 
     69 	struct hid_item item;
     70 	int value;
     71 	char anyvalue;
     72 	char *name;
     73 	char *action;
     74 };
     75 struct command *commands;
     76 
     77 #define SIZE 4000
     78 
     79 void usage(void);
     80 struct command *parse_conf(const char *, report_desc_t, int, int);
     81 void docmd(struct command *, int, const char *, int, char **);
     82 void freecommands(struct command *);
     83 
     84 static void
     85 sighup(int sig)
     86 {
     87 	reparse = 1;
     88 }
     89 
     90 int
     91 main(int argc, char **argv)
     92 {
     93 	const char *conf = NULL;
     94 	const char *dev = NULL;
     95 	int fd, ch, sz, n, val, i;
     96 	int demon, ignore;
     97 	report_desc_t repd;
     98 	char buf[100];
     99 	char devnamebuf[PATH_MAX];
    100 	struct command *cmd;
    101 	int reportid;
    102 	const char *table = NULL;
    103 
    104 	setlinebuf(stdout);
    105 
    106 	demon = 1;
    107 	ignore = 0;
    108 	while ((ch = getopt(argc, argv, "c:df:it:v")) != -1) {
    109 		switch(ch) {
    110 		case 'c':
    111 			conf = optarg;
    112 			break;
    113 		case 'd':
    114 			demon ^= 1;
    115 			break;
    116 		case 'i':
    117 			ignore++;
    118 			break;
    119 		case 'f':
    120 			dev = optarg;
    121 			break;
    122 		case 't':
    123 			table = optarg;
    124 			break;
    125 		case 'v':
    126 			demon = 0;
    127 			verbose++;
    128 			break;
    129 		case '?':
    130 		default:
    131 			usage();
    132 		}
    133 	}
    134 	argc -= optind;
    135 	argv += optind;
    136 
    137 	if (conf == NULL || dev == NULL)
    138 		usage();
    139 
    140 	hid_init(table);
    141 
    142 	if (dev[0] != '/') {
    143 		snprintf(devnamebuf, sizeof(devnamebuf), "/dev/%s%s",
    144 			 isdigit(dev[0]) ? "uhid" : "", dev);
    145 		dev = devnamebuf;
    146 	}
    147 
    148 	fd = open(dev, O_RDWR);
    149 	if (fd < 0)
    150 		err(1, "%s", dev);
    151 	if (ioctl(fd, USB_GET_REPORT_ID, &reportid) < 0)
    152 		reportid = -1;
    153 	repd = hid_get_report_desc(fd);
    154 	if (repd == NULL)
    155 		err(1, "hid_get_report_desc() failed");
    156 
    157 	commands = parse_conf(conf, repd, reportid, ignore);
    158 
    159 	sz = hid_report_size(repd, hid_input, reportid);
    160 
    161 	if (verbose)
    162 		printf("report size %d\n", sz);
    163 	if (sz > sizeof buf)
    164 		errx(1, "report too large");
    165 
    166 	(void)signal(SIGHUP, sighup);
    167 
    168 	if (demon) {
    169 		if (daemon(0, 0) < 0)
    170 			err(1, "daemon()");
    171 		pidfile(NULL);
    172 		isdemon = 1;
    173 	}
    174 
    175 	for(;;) {
    176 		n = read(fd, buf, sz);
    177 		if (verbose > 2) {
    178 			printf("read %d bytes:", n);
    179 			for (i = 0; i < n; i++)
    180 				printf(" %02x", buf[i]);
    181 			printf("\n");
    182 		}
    183 		if (n < 0) {
    184 			if (verbose)
    185 				err(1, "read");
    186 			else
    187 				exit(1);
    188 		}
    189 #if 0
    190 		if (n != sz) {
    191 			err(2, "read size");
    192 		}
    193 #endif
    194 		for (cmd = commands; cmd; cmd = cmd->next) {
    195 			val = hid_get_data(buf, &cmd->item);
    196 			if (cmd->value == val || cmd->anyvalue)
    197 				docmd(cmd, val, dev, argc, argv);
    198 		}
    199 		if (reparse) {
    200 			struct command *cmds =
    201 			    parse_conf(conf, repd, reportid, ignore);
    202 			if (cmds) {
    203 				freecommands(commands);
    204 				commands = cmds;
    205 			}
    206 			reparse = 0;
    207 		}
    208 	}
    209 
    210 	exit(0);
    211 }
    212 
    213 void
    214 usage(void)
    215 {
    216 
    217 	fprintf(stderr, "usage: %s -c config_file [-d] -f hid_dev "
    218 		"[-i] [-t table] [-v]\n", getprogname());
    219 	exit(1);
    220 }
    221 
    222 static int
    223 peek(FILE *f)
    224 {
    225 	int c;
    226 
    227 	c = getc(f);
    228 	if (c != EOF)
    229 		ungetc(c, f);
    230 	return c;
    231 }
    232 
    233 struct command *
    234 parse_conf(const char *conf, report_desc_t repd, int reportid, int ignore)
    235 {
    236 	FILE *f;
    237 	char *p;
    238 	int line;
    239 	char buf[SIZE], name[SIZE], value[SIZE], action[SIZE];
    240 	char usage[SIZE], coll[SIZE];
    241 	struct command *cmd, *cmds;
    242 	struct hid_data *d;
    243 	struct hid_item h;
    244 	int u, lo, hi, range;
    245 
    246 
    247 	f = fopen(conf, "r");
    248 	if (f == NULL)
    249 		err(1, "%s", conf);
    250 
    251 	cmds = NULL;
    252 	for (line = 1; ; line++) {
    253 		if (fgets(buf, sizeof buf, f) == NULL)
    254 			break;
    255 		if (buf[0] == '#' || buf[0] == '\n')
    256 			continue;
    257 		p = strchr(buf, '\n');
    258 		while (p && isspace(peek(f))) {
    259 			if (fgets(p, sizeof buf - strlen(buf), f) == NULL)
    260 				break;
    261 			p = strchr(buf, '\n');
    262 		}
    263 		if (p)
    264 			*p = 0;
    265 		/* XXX SIZE == 4000 */
    266 		if (sscanf(buf, "%3999s %3999s %[^\n]", name, value, action) != 3) {
    267 			if (isdemon) {
    268 				syslog(LOG_WARNING, "config file `%s', line %d"
    269 				       ", syntax error: %s", conf, line, buf);
    270 				freecommands(cmds);
    271 				return (NULL);
    272 			} else {
    273 				errx(1, "config file `%s', line %d,"
    274 				     ", syntax error: %s", conf, line, buf);
    275 			}
    276 		}
    277 
    278 		cmd = malloc(sizeof *cmd);
    279 		if (cmd == NULL)
    280 			err(1, "malloc failed");
    281 		cmd->next = cmds;
    282 		cmds = cmd;
    283 		cmd->line = line;
    284 
    285 		if (strcmp(value, "*") == 0) {
    286 			cmd->anyvalue = 1;
    287 		} else {
    288 			cmd->anyvalue = 0;
    289 			if (sscanf(value, "%d", &cmd->value) != 1) {
    290 				if (isdemon) {
    291 					syslog(LOG_WARNING,
    292 					       "config file `%s', line %d, "
    293 					       "bad value: %s\n",
    294 					       conf, line, value);
    295 					freecommands(cmds);
    296 					return (NULL);
    297 				} else {
    298 					errx(1, "config file `%s', line %d, "
    299 					     "bad value: %s\n",
    300 					     conf, line, value);
    301 				}
    302 			}
    303 		}
    304 
    305 		coll[0] = 0;
    306 		for (d = hid_start_parse(repd, 1 << hid_input, reportid);
    307 		     hid_get_item(d, &h); ) {
    308 			if (verbose > 2)
    309 				printf("kind=%d usage=%x flags=%x\n",
    310 				       h.kind, h.usage, h.flags);
    311 			switch (h.kind) {
    312 			case hid_input:
    313 				if (h.flags & HIO_CONST)
    314 					continue;
    315 				if (h.usage_minimum != 0 ||
    316 				    h.usage_maximum != 0) {
    317 					lo = h.usage_minimum;
    318 					hi = h.usage_maximum;
    319 					range = 1;
    320 				} else {
    321 					lo = h.usage;
    322 					hi = h.usage;
    323 					range = 0;
    324 				}
    325 				for (u = lo; u <= hi; u++) {
    326 					snprintf(usage, sizeof usage,  "%s:%s",
    327 						 hid_usage_page(HID_PAGE(u)),
    328 						 hid_usage_in_page(u));
    329 					if (verbose > 2)
    330 						printf("usage %s\n", usage);
    331 					if (!strcasecmp(usage, name))
    332 						goto foundhid;
    333 					if (coll[0]) {
    334 						snprintf(usage, sizeof usage,
    335 						  "%s.%s:%s", coll+1,
    336 						  hid_usage_page(HID_PAGE(u)),
    337 						  hid_usage_in_page(u));
    338 						if (verbose > 2)
    339 							printf("usage %s\n",
    340 							       usage);
    341 						if (!strcasecmp(usage, name))
    342 							goto foundhid;
    343 					}
    344 				}
    345 				break;
    346 			case hid_collection:
    347 				snprintf(coll + strlen(coll),
    348 				    sizeof coll - strlen(coll),  ".%s:%s",
    349 				    hid_usage_page(HID_PAGE(h.usage)),
    350 				    hid_usage_in_page(h.usage));
    351 				if (verbose > 2)
    352 					printf("coll '%s'\n", coll);
    353 				break;
    354 			case hid_endcollection:
    355 				if (coll[0])
    356 					*strrchr(coll, '.') = 0;
    357 				break;
    358 			default:
    359 				break;
    360 			}
    361 		}
    362 		if (ignore) {
    363 			if (verbose)
    364 				warnx("ignore item '%s'", name);
    365 			continue;
    366 		}
    367 		if (isdemon) {
    368 			syslog(LOG_WARNING, "config file `%s', line %d, HID "
    369 			       "item not found: `%s'", conf, line, name);
    370 			freecommands(cmds);
    371 			return (NULL);
    372 		} else {
    373 			errx(1, "config file `%s', line %d, HID item "
    374 			     "not found: `%s'", conf, line, name);
    375 		}
    376 
    377 	foundhid:
    378 		hid_end_parse(d);
    379 		cmd->item = h;
    380 		cmd->name = strdup(name);
    381 		cmd->action = strdup(action);
    382 		if (range) {
    383 			if (cmd->value == 1)
    384 				cmd->value = u - lo;
    385 			else
    386 				cmd->value = -1;
    387 		}
    388 
    389 		if (verbose)
    390 			printf("PARSE:%d %s, %d, '%s'\n", cmd->line, name,
    391 			       cmd->value, cmd->action);
    392 	}
    393 	fclose(f);
    394 	return (cmds);
    395 }
    396 
    397 void
    398 docmd(struct command *cmd, int value, const char *hid, int argc, char **argv)
    399 {
    400 	char cmdbuf[SIZE], *p, *q;
    401 	size_t len;
    402 	int n, r;
    403 
    404 	for (p = cmd->action, q = cmdbuf; *p && q < &cmdbuf[SIZE-1]; ) {
    405 		if (*p == '$') {
    406 			p++;
    407 			len = &cmdbuf[SIZE-1] - q;
    408 			if (isdigit(*p)) {
    409 				n = strtol(p, &p, 10) - 1;
    410 				if (n >= 0 && n < argc) {
    411 					strncpy(q, argv[n], len);
    412 					q += strlen(q);
    413 				}
    414 			} else if (*p == 'V') {
    415 				p++;
    416 				snprintf(q, len, "%d", value);
    417 				q += strlen(q);
    418 			} else if (*p == 'N') {
    419 				p++;
    420 				strncpy(q, cmd->name, len);
    421 				q += strlen(q);
    422 			} else if (*p == 'H') {
    423 				p++;
    424 				strncpy(q, hid, len);
    425 				q += strlen(q);
    426 			} else if (*p) {
    427 				*q++ = *p++;
    428 			}
    429 		} else {
    430 			*q++ = *p++;
    431 		}
    432 	}
    433 	*q = 0;
    434 
    435 	if (verbose)
    436 		printf("system '%s'\n", cmdbuf);
    437 	r = system(cmdbuf);
    438 	if (verbose > 1 && r)
    439 		printf("return code = 0x%x\n", r);
    440 }
    441 
    442 void
    443 freecommands(struct command *cmd)
    444 {
    445 	struct command *next;
    446 
    447 	while (cmd) {
    448 		next = cmd->next;
    449 		free(cmd);
    450 		cmd = next;
    451 	}
    452 }
    453