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usbhidaction.c revision 1.3 
      1 /*      $NetBSD: usbhidaction.c,v 1.3 2001/02/20 23:55:42 cgd Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2000 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 
     39 #include <stdio.h>
     40 #include <stdlib.h>
     41 #include <string.h>
     42 #include <ctype.h>
     43 #include <err.h>
     44 #include <fcntl.h>
     45 #include <unistd.h>
     46 #include <sys/types.h>
     47 #include <sys/ioctl.h>
     48 #include <dev/usb/usb.h>
     49 #include <dev/usb/usbhid.h>
     50 #include <usb.h>
     51 #include <util.h>
     52 
     53 int verbose = 0;
     54 
     55 struct command {
     56 	struct command *next;
     57 	int line;
     58 
     59 	struct hid_item item;
     60 	int value;
     61 	char anyvalue;
     62 	char *name;
     63 	char *action;
     64 };
     65 struct command *commands;
     66 
     67 #define SIZE 4000
     68 
     69 void usage(void);
     70 void parse_conf(const char *conf, report_desc_t repd, int ignore);
     71 void docmd(struct command *cmd, int value, const char *hid,
     72 	   int argc, char **argv);
     73 
     74 int
     75 main(int argc, char **argv)
     76 {
     77 	const char *conf = NULL;
     78 	const char *hid = NULL;
     79 	int fd, ch, sz, n, val;
     80 	int demon, ignore;
     81 	report_desc_t repd;
     82 	char buf[100];
     83 	struct command *cmd;
     84 
     85 	demon = 1;
     86 	ignore = 0;
     87 	while ((ch = getopt(argc, argv, "c:dif:v")) != -1) {
     88 		switch(ch) {
     89 		case 'c':
     90 			conf = optarg;
     91 			break;
     92 		case 'd':
     93 			demon ^= 1;
     94 			break;
     95 		case 'i':
     96 			ignore++;
     97 			break;
     98 		case 'f':
     99 			hid = optarg;
    100 			break;
    101 		case 'v':
    102 			demon = 0;
    103 			verbose++;
    104 			break;
    105 		case '?':
    106 		default:
    107 			usage();
    108 		}
    109 	}
    110 	argc -= optind;
    111 	argv += optind;
    112 
    113 	if (conf == NULL || hid == NULL)
    114 		usage();
    115 
    116 	hid_init(NULL);
    117 
    118 	fd = open(hid, O_RDWR);
    119 	if (fd < 0)
    120 		err(1, "%s", hid);
    121 	repd = hid_get_report_desc(fd);
    122 	if (repd == NULL)
    123 		err(1, "hid_get_report_desc() failed\n");
    124 
    125 	parse_conf(conf, repd, ignore);
    126 
    127 	sz = hid_report_size(repd, hid_input, NULL);
    128 	hid_dispose_report_desc(repd);
    129 
    130 	if (verbose)
    131 		printf("report size %d\n", sz);
    132 	if (sz > sizeof buf)
    133 		errx(1, "report too large");
    134 
    135 	if (demon) {
    136 		if (daemon(0, 0) < 0)
    137 			err(1, "daemon()");
    138 		pidfile(NULL);
    139 	}
    140 
    141 	for(;;) {
    142 		n = read(fd, buf, sz);
    143 		if (verbose > 2)
    144 			printf("read %d bytes [%02x]\n", n, buf[0]);
    145 		if (n < 0) {
    146 			if (verbose)
    147 				err(1, "read");
    148 			else
    149 				exit(1);
    150 		}
    151 		for (cmd = commands; cmd; cmd = cmd->next) {
    152 			val = hid_get_data(buf, &cmd->item);
    153 			if (cmd->value == val || cmd->anyvalue)
    154 				docmd(cmd, val, hid, argc, argv);
    155 		}
    156 	}
    157 
    158 	exit(0);
    159 }
    160 
    161 void
    162 usage(void)
    163 {
    164 
    165 	fprintf(stderr, "Usage: %s -c config_file [-d] -f hid_dev "
    166 	    " [-v]\n", getprogname());
    167 	exit(1);
    168 }
    169 
    170 static int
    171 peek(FILE *f)
    172 {
    173 	int c;
    174 
    175 	c = getc(f);
    176 	if (c != EOF)
    177 		ungetc(c, f);
    178 	return c;
    179 }
    180 
    181 void
    182 parse_conf(const char *conf, report_desc_t repd, int ignore)
    183 {
    184 	FILE *f;
    185 	char *p;
    186 	int line;
    187 	char buf[SIZE], name[SIZE], value[SIZE], action[SIZE];
    188 	char usage[SIZE], coll[SIZE];
    189 	struct command *cmd;
    190 	struct hid_data *d;
    191 	struct hid_item h;
    192 
    193 	f = fopen(conf, "r");
    194 	if (f == NULL)
    195 		err(1, "%s", conf);
    196 
    197 	for (line = 1; ; line++) {
    198 		if (fgets(buf, sizeof buf, f) == NULL)
    199 			break;
    200 		if (buf[0] == '#' || buf[0] == '\n')
    201 			continue;
    202 		p = strchr(buf, '\n');
    203 		while (p && isspace(peek(f))) {
    204 			if (fgets(p, sizeof buf - strlen(buf), f) == NULL)
    205 				break;
    206 			p = strchr(buf, '\n');
    207 		}
    208 		if (p)
    209 			*p = 0;
    210 		if (sscanf(buf, "%s %s %[^\n]", name, value, action) != 3) {
    211 			errx(1, "config file `%s', line %d, syntax error: %s",
    212 			     conf, line, buf);
    213 		}
    214 
    215 		cmd = malloc(sizeof *cmd);
    216 		if (cmd == NULL)
    217 			err(1, "malloc failed");
    218 		cmd->next = commands;
    219 		commands = cmd;
    220 		cmd->line = line;
    221 
    222 		if (strcmp(value, "*") == 0) {
    223 			cmd->anyvalue = 1;
    224 		} else {
    225 			cmd->anyvalue = 0;
    226 			if (sscanf(value, "%d", &cmd->value) != 1)
    227 				errx(1, "config file `%s', line %d, "
    228 				     "bad value: %s\n", conf, line, value);
    229 		}
    230 
    231 		coll[0] = 0;
    232 		for (d = hid_start_parse(repd, 1 << hid_input);
    233 		     hid_get_item(d, &h); ) {
    234 			if (verbose > 2)
    235 				printf("kind=%d usage=%x\n", h.kind, h.usage);
    236 			if (h.flags & HIO_CONST)
    237 				continue;
    238 			switch (h.kind) {
    239 			case hid_input:
    240 				snprintf(usage, sizeof usage,  "%s:%s",
    241 					 hid_usage_page(HID_PAGE(h.usage)),
    242 					 hid_usage_in_page(h.usage));
    243 				if (verbose > 2)
    244 					printf("usage %s\n", usage);
    245 				if (strcasecmp(usage, name) == 0)
    246 					goto foundhid;
    247 				if (coll[0]) {
    248 					snprintf(usage, sizeof usage,
    249 					    "%s.%s:%s", coll+1,
    250 					    hid_usage_page(HID_PAGE(h.usage)),
    251 					    hid_usage_in_page(h.usage));
    252 					if (verbose > 2)
    253 						printf("usage %s\n", usage);
    254 					if (strcasecmp(usage, name) == 0)
    255 						goto foundhid;
    256 				}
    257 				break;
    258 			case hid_collection:
    259 				snprintf(coll + strlen(coll),
    260 				    sizeof coll - strlen(coll),  ".%s:%s",
    261 				    hid_usage_page(HID_PAGE(h.usage)),
    262 				    hid_usage_in_page(h.usage));
    263 				break;
    264 			case hid_endcollection:
    265 				if (coll[0])
    266 					*strrchr(coll, '.') = 0;
    267 				break;
    268 			default:
    269 				break;
    270 			}
    271 		}
    272 		if (ignore) {
    273 			if (verbose)
    274 				warnx("ignore item '%s'\n", name);
    275 			continue;
    276 		}
    277 		errx(1, "config file `%s', line %d, HID item not found: `%s'\n",
    278 		     conf, line, name);
    279 
    280 	foundhid:
    281 		hid_end_parse(d);
    282 		cmd->item = h;
    283 		cmd->name = strdup(name);
    284 		cmd->action = strdup(action);
    285 
    286 		if (verbose)
    287 			printf("PARSE:%d %s, %d, '%s'\n", cmd->line, name,
    288 			       cmd->value, cmd->action);
    289 	}
    290 	fclose(f);
    291 }
    292 
    293 void
    294 docmd(struct command *cmd, int value, const char *hid, int argc, char **argv)
    295 {
    296 	char cmdbuf[SIZE], *p, *q;
    297 	size_t len;
    298 	int n, r;
    299 
    300 	for (p = cmd->action, q = cmdbuf; *p && q < &cmdbuf[SIZE-1]; ) {
    301 		if (*p == '$') {
    302 			p++;
    303 			len = &cmdbuf[SIZE-1] - q;
    304 			if (isdigit(*p)) {
    305 				n = strtol(p, &p, 10) - 1;
    306 				if (n >= 0 && n < argc) {
    307 					strncpy(q, argv[n], len);
    308 					q += strlen(q);
    309 				}
    310 			} else if (*p == 'V') {
    311 				p++;
    312 				snprintf(q, len, "%d", value);
    313 				q += strlen(q);
    314 			} else if (*p == 'N') {
    315 				p++;
    316 				strncpy(q, cmd->name, len);
    317 				q += strlen(q);
    318 			} else if (*p == 'H') {
    319 				p++;
    320 				strncpy(q, hid, len);
    321 				q += strlen(q);
    322 			} else if (*p) {
    323 				*q++ = *p++;
    324 			}
    325 		} else {
    326 			*q++ = *p++;
    327 		}
    328 	}
    329 	*q = 0;
    330 
    331 	if (verbose)
    332 		printf("system '%s'\n", cmdbuf);
    333 	r = system(cmdbuf);
    334 	if (verbose > 1 && r)
    335 		printf("return code = 0x%x\n", r);
    336 }
    337