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usbhidaction.c revision 1.14 
      1 /*      $NetBSD: usbhidaction.c,v 1.14 2004/10/20 13:53:56 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 1.14 2004/10/20 13:53:56 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 	demon = 1;
    105 	ignore = 0;
    106 	while ((ch = getopt(argc, argv, "c:df:it:v")) != -1) {
    107 		switch(ch) {
    108 		case 'c':
    109 			conf = optarg;
    110 			break;
    111 		case 'd':
    112 			demon ^= 1;
    113 			break;
    114 		case 'i':
    115 			ignore++;
    116 			break;
    117 		case 'f':
    118 			dev = optarg;
    119 			break;
    120 		case 't':
    121 			table = optarg;
    122 			break;
    123 		case 'v':
    124 			demon = 0;
    125 			verbose++;
    126 			break;
    127 		case '?':
    128 		default:
    129 			usage();
    130 		}
    131 	}
    132 	argc -= optind;
    133 	argv += optind;
    134 
    135 	if (conf == NULL || dev == NULL)
    136 		usage();
    137 
    138 	hid_init(table);
    139 
    140 	if (dev[0] != '/') {
    141 		snprintf(devnamebuf, sizeof(devnamebuf), "/dev/%s%s",
    142 			 isdigit(dev[0]) ? "uhid" : "", dev);
    143 		dev = devnamebuf;
    144 	}
    145 
    146 	fd = open(dev, O_RDWR);
    147 	if (fd < 0)
    148 		err(1, "%s", dev);
    149 	if (ioctl(fd, USB_GET_REPORT_ID, &reportid) < 0)
    150 		reportid = -1;
    151 	repd = hid_get_report_desc(fd);
    152 	if (repd == NULL)
    153 		err(1, "hid_get_report_desc() failed");
    154 
    155 	commands = parse_conf(conf, repd, reportid, ignore);
    156 
    157 	sz = hid_report_size(repd, hid_input, reportid);
    158 
    159 	if (verbose)
    160 		printf("report size %d\n", sz);
    161 	if (sz > sizeof buf)
    162 		errx(1, "report too large");
    163 
    164 	(void)signal(SIGHUP, sighup);
    165 
    166 	if (demon) {
    167 		if (daemon(0, 0) < 0)
    168 			err(1, "daemon()");
    169 		pidfile(NULL);
    170 		isdemon = 1;
    171 	}
    172 
    173 	for(;;) {
    174 		n = read(fd, buf, sz);
    175 		if (verbose > 2) {
    176 			printf("read %d bytes:", n);
    177 			for (i = 0; i < n; i++)
    178 				printf(" %02x", buf[i]);
    179 			printf("\n");
    180 		}
    181 		if (n < 0) {
    182 			if (verbose)
    183 				err(1, "read");
    184 			else
    185 				exit(1);
    186 		}
    187 #if 0
    188 		if (n != sz) {
    189 			err(2, "read size");
    190 		}
    191 #endif
    192 		for (cmd = commands; cmd; cmd = cmd->next) {
    193 			val = hid_get_data(buf, &cmd->item);
    194 			if (cmd->value == val || cmd->anyvalue)
    195 				docmd(cmd, val, dev, argc, argv);
    196 		}
    197 		if (reparse) {
    198 			struct command *cmds =
    199 			    parse_conf(conf, repd, reportid, ignore);
    200 			if (cmds) {
    201 				freecommands(commands);
    202 				commands = cmds;
    203 			}
    204 			reparse = 0;
    205 		}
    206 	}
    207 
    208 	exit(0);
    209 }
    210 
    211 void
    212 usage(void)
    213 {
    214 
    215 	fprintf(stderr, "usage: %s -c config_file [-d] -f hid_dev "
    216 		"[-i] [-t table] [-v]\n", getprogname());
    217 	exit(1);
    218 }
    219 
    220 static int
    221 peek(FILE *f)
    222 {
    223 	int c;
    224 
    225 	c = getc(f);
    226 	if (c != EOF)
    227 		ungetc(c, f);
    228 	return c;
    229 }
    230 
    231 struct command *
    232 parse_conf(const char *conf, report_desc_t repd, int reportid, int ignore)
    233 {
    234 	FILE *f;
    235 	char *p;
    236 	int line;
    237 	char buf[SIZE], name[SIZE], value[SIZE], action[SIZE];
    238 	char usage[SIZE], coll[SIZE];
    239 	struct command *cmd, *cmds;
    240 	struct hid_data *d;
    241 	struct hid_item h;
    242 	int u, lo, hi, range;
    243 
    244 
    245 	f = fopen(conf, "r");
    246 	if (f == NULL)
    247 		err(1, "%s", conf);
    248 
    249 	cmds = NULL;
    250 	for (line = 1; ; line++) {
    251 		if (fgets(buf, sizeof buf, f) == NULL)
    252 			break;
    253 		if (buf[0] == '#' || buf[0] == '\n')
    254 			continue;
    255 		p = strchr(buf, '\n');
    256 		while (p && isspace(peek(f))) {
    257 			if (fgets(p, sizeof buf - strlen(buf), f) == NULL)
    258 				break;
    259 			p = strchr(buf, '\n');
    260 		}
    261 		if (p)
    262 			*p = 0;
    263 		/* XXX SIZE == 4000 */
    264 		if (sscanf(buf, "%3999s %3999s %[^\n]", name, value, action) != 3) {
    265 			if (isdemon) {
    266 				syslog(LOG_WARNING, "config file `%s', line %d"
    267 				       ", syntax error: %s", conf, line, buf);
    268 				freecommands(cmds);
    269 				return (NULL);
    270 			} else {
    271 				errx(1, "config file `%s', line %d,"
    272 				     ", syntax error: %s", conf, line, buf);
    273 			}
    274 		}
    275 
    276 		cmd = malloc(sizeof *cmd);
    277 		if (cmd == NULL)
    278 			err(1, "malloc failed");
    279 		cmd->next = cmds;
    280 		cmds = cmd;
    281 		cmd->line = line;
    282 
    283 		if (strcmp(value, "*") == 0) {
    284 			cmd->anyvalue = 1;
    285 		} else {
    286 			cmd->anyvalue = 0;
    287 			if (sscanf(value, "%d", &cmd->value) != 1) {
    288 				if (isdemon) {
    289 					syslog(LOG_WARNING,
    290 					       "config file `%s', line %d, "
    291 					       "bad value: %s\n",
    292 					       conf, line, value);
    293 					freecommands(cmds);
    294 					return (NULL);
    295 				} else {
    296 					errx(1, "config file `%s', line %d, "
    297 					     "bad value: %s\n",
    298 					     conf, line, value);
    299 				}
    300 			}
    301 		}
    302 
    303 		coll[0] = 0;
    304 		for (d = hid_start_parse(repd, 1 << hid_input, reportid);
    305 		     hid_get_item(d, &h); ) {
    306 			if (verbose > 2)
    307 				printf("kind=%d usage=%x flags=%x\n",
    308 				       h.kind, h.usage, h.flags);
    309 			if ((h.flags & HIO_CONST) && h.kind != hid_collection)
    310 				continue;
    311 			switch (h.kind) {
    312 			case hid_input:
    313 				if (h.usage_minimum != 0 ||
    314 				    h.usage_maximum != 0) {
    315 					lo = h.usage_minimum;
    316 					hi = h.usage_maximum;
    317 					range = 1;
    318 				} else {
    319 					lo = h.usage;
    320 					hi = h.usage;
    321 					range = 0;
    322 				}
    323 				for (u = lo; u <= hi; u++) {
    324 					snprintf(usage, sizeof usage,  "%s:%s",
    325 						 hid_usage_page(HID_PAGE(u)),
    326 						 hid_usage_in_page(u));
    327 					if (verbose > 2)
    328 						printf("usage %s\n", usage);
    329 					if (!strcasecmp(usage, name))
    330 						goto foundhid;
    331 					if (coll[0]) {
    332 						snprintf(usage, sizeof usage,
    333 						  "%s.%s:%s", coll+1,
    334 						  hid_usage_page(HID_PAGE(u)),
    335 						  hid_usage_in_page(u));
    336 						if (verbose > 2)
    337 							printf("usage %s\n",
    338 							       usage);
    339 						if (!strcasecmp(usage, name))
    340 							goto foundhid;
    341 					}
    342 				}
    343 				break;
    344 			case hid_collection:
    345 				snprintf(coll + strlen(coll),
    346 				    sizeof coll - strlen(coll),  ".%s:%s",
    347 				    hid_usage_page(HID_PAGE(h.usage)),
    348 				    hid_usage_in_page(h.usage));
    349 				if (verbose > 2)
    350 					printf("coll '%s'\n", coll);
    351 				break;
    352 			case hid_endcollection:
    353 				if (coll[0])
    354 					*strrchr(coll, '.') = 0;
    355 				break;
    356 			default:
    357 				break;
    358 			}
    359 		}
    360 		if (ignore) {
    361 			if (verbose)
    362 				warnx("ignore item '%s'", name);
    363 			continue;
    364 		}
    365 		if (isdemon) {
    366 			syslog(LOG_WARNING, "config file `%s', line %d, HID "
    367 			       "item not found: `%s'", conf, line, name);
    368 			freecommands(cmds);
    369 			return (NULL);
    370 		} else {
    371 			errx(1, "config file `%s', line %d, HID item "
    372 			     "not found: `%s'", conf, line, name);
    373 		}
    374 
    375 	foundhid:
    376 		hid_end_parse(d);
    377 		cmd->item = h;
    378 		cmd->name = strdup(name);
    379 		cmd->action = strdup(action);
    380 		if (range) {
    381 			if (cmd->value == 1)
    382 				cmd->value = u - lo;
    383 			else
    384 				cmd->value = -1;
    385 		}
    386 
    387 		if (verbose)
    388 			printf("PARSE:%d %s, %d, '%s'\n", cmd->line, name,
    389 			       cmd->value, cmd->action);
    390 	}
    391 	fclose(f);
    392 	return (cmds);
    393 }
    394 
    395 void
    396 docmd(struct command *cmd, int value, const char *hid, int argc, char **argv)
    397 {
    398 	char cmdbuf[SIZE], *p, *q;
    399 	size_t len;
    400 	int n, r;
    401 
    402 	for (p = cmd->action, q = cmdbuf; *p && q < &cmdbuf[SIZE-1]; ) {
    403 		if (*p == '$') {
    404 			p++;
    405 			len = &cmdbuf[SIZE-1] - q;
    406 			if (isdigit(*p)) {
    407 				n = strtol(p, &p, 10) - 1;
    408 				if (n >= 0 && n < argc) {
    409 					strncpy(q, argv[n], len);
    410 					q += strlen(q);
    411 				}
    412 			} else if (*p == 'V') {
    413 				p++;
    414 				snprintf(q, len, "%d", value);
    415 				q += strlen(q);
    416 			} else if (*p == 'N') {
    417 				p++;
    418 				strncpy(q, cmd->name, len);
    419 				q += strlen(q);
    420 			} else if (*p == 'H') {
    421 				p++;
    422 				strncpy(q, hid, len);
    423 				q += strlen(q);
    424 			} else if (*p) {
    425 				*q++ = *p++;
    426 			}
    427 		} else {
    428 			*q++ = *p++;
    429 		}
    430 	}
    431 	*q = 0;
    432 
    433 	if (verbose)
    434 		printf("system '%s'\n", cmdbuf);
    435 	r = system(cmdbuf);
    436 	if (verbose > 1 && r)
    437 		printf("return code = 0x%x\n", r);
    438 }
    439 
    440 void
    441 freecommands(struct command *cmd)
    442 {
    443 	struct command *next;
    444 
    445 	while (cmd) {
    446 		next = cmd->next;
    447 		free(cmd);
    448 		cmd = next;
    449 	}
    450 }
    451