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usbhidaction.c revision 1.12 
      1 /*      $NetBSD: usbhidaction.c,v 1.12 2004/10/10 01:16:17 mrg 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 1.12 2004/10/10 01:16:17 mrg 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 = 1;
     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 
    103 	demon = 1;
    104 	ignore = 0;
    105 	while ((ch = getopt(argc, argv, "c:df:iv")) != -1) {
    106 		switch(ch) {
    107 		case 'c':
    108 			conf = optarg;
    109 			break;
    110 		case 'd':
    111 			demon ^= 1;
    112 			break;
    113 		case 'i':
    114 			ignore++;
    115 			break;
    116 		case 'f':
    117 			dev = optarg;
    118 			break;
    119 		case 'v':
    120 			demon = 0;
    121 			verbose++;
    122 			break;
    123 		case '?':
    124 		default:
    125 			usage();
    126 		}
    127 	}
    128 	argc -= optind;
    129 	argv += optind;
    130 
    131 	if (conf == NULL || dev == NULL)
    132 		usage();
    133 
    134 	hid_init(NULL);
    135 
    136 	if (dev[0] != '/') {
    137 		snprintf(devnamebuf, sizeof(devnamebuf), "/dev/%s%s",
    138 			 isdigit(dev[0]) ? "uhid" : "", dev);
    139 		dev = devnamebuf;
    140 	}
    141 
    142 	fd = open(dev, O_RDWR);
    143 	if (fd < 0)
    144 		err(1, "%s", dev);
    145 	if (ioctl(fd, USB_GET_REPORT_ID, &reportid) < 0)
    146 		reportid = -1;
    147 	repd = hid_get_report_desc(fd);
    148 	if (repd == NULL)
    149 		err(1, "hid_get_report_desc() failed");
    150 
    151 	commands = parse_conf(conf, repd, reportid, ignore);
    152 
    153 	sz = hid_report_size(repd, hid_input, reportid);
    154 
    155 	if (verbose)
    156 		printf("report size %d\n", sz);
    157 	if (sz > sizeof buf)
    158 		errx(1, "report too large");
    159 
    160 	(void)signal(SIGHUP, sighup);
    161 
    162 	if (demon) {
    163 		if (daemon(0, 0) < 0)
    164 			err(1, "daemon()");
    165 		pidfile(NULL);
    166 		isdemon = 1;
    167 	}
    168 
    169 	for(;;) {
    170 		n = read(fd, buf, sz);
    171 		if (verbose > 2) {
    172 			printf("read %d bytes:", n);
    173 			for (i = 0; i < n; i++)
    174 				printf(" %02x", buf[i]);
    175 			printf("\n");
    176 		}
    177 		if (n < 0) {
    178 			if (verbose)
    179 				err(1, "read");
    180 			else
    181 				exit(1);
    182 		}
    183 #if 0
    184 		if (n != sz) {
    185 			err(2, "read size");
    186 		}
    187 #endif
    188 		for (cmd = commands; cmd; cmd = cmd->next) {
    189 			val = hid_get_data(buf, &cmd->item);
    190 			if (cmd->value == val || cmd->anyvalue)
    191 				docmd(cmd, val, dev, argc, argv);
    192 		}
    193 		if (reparse) {
    194 			struct command *cmds =
    195 			    parse_conf(conf, repd, reportid, ignore);
    196 			if (cmds) {
    197 				freecommands(commands);
    198 				commands = cmds;
    199 			}
    200 			reparse = 0;
    201 		}
    202 	}
    203 
    204 	exit(0);
    205 }
    206 
    207 void
    208 usage(void)
    209 {
    210 
    211 	fprintf(stderr, "usage: %s -c config_file [-d] -f hid_dev "
    212 		"[-i] [-v]\n", getprogname());
    213 	exit(1);
    214 }
    215 
    216 static int
    217 peek(FILE *f)
    218 {
    219 	int c;
    220 
    221 	c = getc(f);
    222 	if (c != EOF)
    223 		ungetc(c, f);
    224 	return c;
    225 }
    226 
    227 struct command *
    228 parse_conf(const char *conf, report_desc_t repd, int reportid, int ignore)
    229 {
    230 	FILE *f;
    231 	char *p;
    232 	int line;
    233 	char buf[SIZE], name[SIZE], value[SIZE], action[SIZE];
    234 	char usage[SIZE], coll[SIZE];
    235 	struct command *cmd, *cmds;
    236 	struct hid_data *d;
    237 	struct hid_item h;
    238 	int u, lo, hi, range;
    239 
    240 
    241 	f = fopen(conf, "r");
    242 	if (f == NULL)
    243 		err(1, "%s", conf);
    244 
    245 	cmds = NULL;
    246 	for (line = 1; ; line++) {
    247 		if (fgets(buf, sizeof buf, f) == NULL)
    248 			break;
    249 		if (buf[0] == '#' || buf[0] == '\n')
    250 			continue;
    251 		p = strchr(buf, '\n');
    252 		while (p && isspace(peek(f))) {
    253 			if (fgets(p, sizeof buf - strlen(buf), f) == NULL)
    254 				break;
    255 			p = strchr(buf, '\n');
    256 		}
    257 		if (p)
    258 			*p = 0;
    259 		/* XXX SIZE == 4000 */
    260 		if (sscanf(buf, "%3999s %3999s %[^\n]", name, value, action) != 3) {
    261 			if (isdemon) {
    262 				syslog(LOG_WARNING, "config file `%s', line %d"
    263 				       ", syntax error: %s", conf, line, buf);
    264 				freecommands(cmds);
    265 				return (NULL);
    266 			} else {
    267 				errx(1, "config file `%s', line %d,"
    268 				     ", syntax error: %s", conf, line, buf);
    269 			}
    270 		}
    271 
    272 		cmd = malloc(sizeof *cmd);
    273 		if (cmd == NULL)
    274 			err(1, "malloc failed");
    275 		cmd->next = cmds;
    276 		cmds = cmd;
    277 		cmd->line = line;
    278 
    279 		if (strcmp(value, "*") == 0) {
    280 			cmd->anyvalue = 1;
    281 		} else {
    282 			cmd->anyvalue = 0;
    283 			if (sscanf(value, "%d", &cmd->value) != 1) {
    284 				if (isdemon) {
    285 					syslog(LOG_WARNING,
    286 					       "config file `%s', line %d, "
    287 					       "bad value: %s\n",
    288 					       conf, line, value);
    289 					freecommands(cmds);
    290 					return (NULL);
    291 				} else {
    292 					errx(1, "config file `%s', line %d, "
    293 					     "bad value: %s\n",
    294 					     conf, line, value);
    295 				}
    296 			}
    297 		}
    298 
    299 		coll[0] = 0;
    300 		for (d = hid_start_parse(repd, 1 << hid_input, reportid);
    301 		     hid_get_item(d, &h); ) {
    302 			if (verbose > 2)
    303 				printf("kind=%d usage=%x\n", h.kind, h.usage);
    304 			if (h.flags & HIO_CONST)
    305 				continue;
    306 			switch (h.kind) {
    307 			case hid_input:
    308 				if (h.usage_minimum != 0 ||
    309 				    h.usage_maximum != 0) {
    310 					lo = h.usage_minimum;
    311 					hi = h.usage_maximum;
    312 					range = 1;
    313 				} else {
    314 					lo = h.usage;
    315 					hi = h.usage;
    316 					range = 0;
    317 				}
    318 				for (u = lo; u <= hi; u++) {
    319 					snprintf(usage, sizeof usage,  "%s:%s",
    320 						 hid_usage_page(HID_PAGE(u)),
    321 						 hid_usage_in_page(u));
    322 					if (verbose > 2)
    323 						printf("usage %s\n", usage);
    324 					if (!strcasecmp(usage, name))
    325 						goto foundhid;
    326 					if (coll[0]) {
    327 						snprintf(usage, sizeof usage,
    328 						  "%s.%s:%s", coll+1,
    329 						  hid_usage_page(HID_PAGE(u)),
    330 						  hid_usage_in_page(u));
    331 						if (verbose > 2)
    332 							printf("usage %s\n",
    333 							       usage);
    334 						if (!strcasecmp(usage, name))
    335 							goto foundhid;
    336 					}
    337 				}
    338 				break;
    339 			case hid_collection:
    340 				snprintf(coll + strlen(coll),
    341 				    sizeof coll - strlen(coll),  ".%s:%s",
    342 				    hid_usage_page(HID_PAGE(h.usage)),
    343 				    hid_usage_in_page(h.usage));
    344 				break;
    345 			case hid_endcollection:
    346 				if (coll[0])
    347 					*strrchr(coll, '.') = 0;
    348 				break;
    349 			default:
    350 				break;
    351 			}
    352 		}
    353 		if (ignore) {
    354 			if (verbose)
    355 				warnx("ignore item '%s'", name);
    356 			continue;
    357 		}
    358 		if (isdemon) {
    359 			syslog(LOG_WARNING, "config file `%s', line %d, HID "
    360 			       "item not found: `%s'", conf, line, name);
    361 			freecommands(cmds);
    362 			return (NULL);
    363 		} else {
    364 			errx(1, "config file `%s', line %d, HID item "
    365 			     "not found: `%s'", conf, line, name);
    366 		}
    367 
    368 	foundhid:
    369 		hid_end_parse(d);
    370 		cmd->item = h;
    371 		cmd->name = strdup(name);
    372 		cmd->action = strdup(action);
    373 		if (range) {
    374 			if (cmd->value == 1)
    375 				cmd->value = u - lo;
    376 			else
    377 				cmd->value = -1;
    378 		}
    379 
    380 		if (verbose)
    381 			printf("PARSE:%d %s, %d, '%s'\n", cmd->line, name,
    382 			       cmd->value, cmd->action);
    383 	}
    384 	fclose(f);
    385 	return (cmds);
    386 }
    387 
    388 void
    389 docmd(struct command *cmd, int value, const char *hid, int argc, char **argv)
    390 {
    391 	char cmdbuf[SIZE], *p, *q;
    392 	size_t len;
    393 	int n, r;
    394 
    395 	for (p = cmd->action, q = cmdbuf; *p && q < &cmdbuf[SIZE-1]; ) {
    396 		if (*p == '$') {
    397 			p++;
    398 			len = &cmdbuf[SIZE-1] - q;
    399 			if (isdigit(*p)) {
    400 				n = strtol(p, &p, 10) - 1;
    401 				if (n >= 0 && n < argc) {
    402 					strncpy(q, argv[n], len);
    403 					q += strlen(q);
    404 				}
    405 			} else if (*p == 'V') {
    406 				p++;
    407 				snprintf(q, len, "%d", value);
    408 				q += strlen(q);
    409 			} else if (*p == 'N') {
    410 				p++;
    411 				strncpy(q, cmd->name, len);
    412 				q += strlen(q);
    413 			} else if (*p == 'H') {
    414 				p++;
    415 				strncpy(q, hid, len);
    416 				q += strlen(q);
    417 			} else if (*p) {
    418 				*q++ = *p++;
    419 			}
    420 		} else {
    421 			*q++ = *p++;
    422 		}
    423 	}
    424 	*q = 0;
    425 
    426 	if (verbose)
    427 		printf("system '%s'\n", cmdbuf);
    428 	r = system(cmdbuf);
    429 	if (verbose > 1 && r)
    430 		printf("return code = 0x%x\n", r);
    431 }
    432 
    433 void
    434 freecommands(struct command *cmd)
    435 {
    436 	struct command *next;
    437 
    438 	while (cmd) {
    439 		next = cmd->next;
    440 		free(cmd);
    441 		cmd = next;
    442 	}
    443 }
    444