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1.15 ! jasper 1: /* $OpenBSD: usbhidaction.c,v 1.14 2010/06/29 17:16:35 deraadt Exp $ */
1.1 nate 2: /* $NetBSD: usbhidaction.c,v 1.7 2002/01/18 14:38:59 augustss Exp $ */
3:
4: /*
5: * Copyright (c) 2000, 2002 The NetBSD Foundation, Inc.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to The NetBSD Foundation
9: * by Lennart Augustsson <lennart@augustsson.net>.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30: * POSSIBILITY OF SUCH DAMAGE.
31: */
32:
33: #include <stdio.h>
34: #include <stdlib.h>
35: #include <string.h>
36: #include <ctype.h>
37: #include <err.h>
38: #include <fcntl.h>
39: #include <limits.h>
40: #include <unistd.h>
41: #include <sys/types.h>
42: #include <sys/ioctl.h>
43: #include <dev/usb/usb.h>
44: #include <dev/usb/usbhid.h>
45: #include <usbhid.h>
46: #include <util.h>
47: #include <syslog.h>
48: #include <signal.h>
1.15 ! jasper 49: #include <paths.h>
1.1 nate 50:
51: int verbose = 0;
52: int isdemon = 0;
1.9 deraadt 53:
54: volatile sig_atomic_t reparse = 0;
1.1 nate 55:
56: struct command {
57: struct command *next;
58: int line;
59:
60: struct hid_item item;
61: int value;
62: char anyvalue;
63: char *name;
64: char *action;
65: };
66: struct command *commands;
67:
68: #define SIZE 4000
69:
70: void usage(void);
71: struct command *parse_conf(const char *, report_desc_t, int, int);
72: void docmd(struct command *, int, const char *, int, char **);
73: void freecommands(struct command *);
74:
1.5 deraadt 75: /* ARGSUSED */
1.1 nate 76: static void
1.5 deraadt 77: sighup(int signo)
1.1 nate 78: {
79: reparse = 1;
80: }
81:
82: int
83: main(int argc, char **argv)
84: {
85: const char *conf = NULL;
86: const char *dev = NULL;
87: int fd, ch, sz, n, val, i;
88: int demon, ignore;
89: report_desc_t repd;
90: char buf[100];
91: char devnamebuf[PATH_MAX];
92: struct command *cmd;
93: int reportid;
94:
95: demon = 1;
96: ignore = 0;
97: while ((ch = getopt(argc, argv, "c:df:iv")) != -1) {
98: switch(ch) {
99: case 'c':
100: conf = optarg;
101: break;
102: case 'd':
103: demon ^= 1;
104: break;
105: case 'i':
106: ignore++;
107: break;
108: case 'f':
109: dev = optarg;
110: break;
111: case 'v':
112: demon = 0;
113: verbose++;
114: break;
115: case '?':
116: default:
117: usage();
118: }
119: }
120: argc -= optind;
121: argv += optind;
122:
123: if (conf == NULL || dev == NULL)
124: usage();
125:
1.4 deraadt 126: if (hid_start(NULL) == -1)
127: errx(1, "hid_init");
1.1 nate 128:
129: if (dev[0] != '/') {
130: snprintf(devnamebuf, sizeof(devnamebuf), "/dev/%s%s",
1.4 deraadt 131: isdigit(dev[0]) ? "uhid" : "", dev);
1.1 nate 132: dev = devnamebuf;
133: }
1.8 mk 134:
135: if (demon && conf[0] != '/')
136: errx(1, "config file must have an absolute path, %s", conf);
1.1 nate 137:
138: fd = open(dev, O_RDWR);
139: if (fd < 0)
140: err(1, "%s", dev);
1.7 fgsch 141:
142: /* Avoid passing the device file descriptor to executed commands */
143: if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
144: err(1, "fcntl(F_SETFD, FD_CLOEXEC)");
145:
1.1 nate 146: if (ioctl(fd, USB_GET_REPORT_ID, &reportid) < 0)
147: reportid = -1;
148: repd = hid_get_report_desc(fd);
149: if (repd == NULL)
1.2 jsyn 150: err(1, "hid_get_report_desc() failed");
1.1 nate 151:
152: commands = parse_conf(conf, repd, reportid, ignore);
153:
154: sz = hid_report_size(repd, hid_input, reportid);
155:
156: if (verbose)
157: printf("report size %d\n", sz);
158: if (sz > sizeof buf)
159: errx(1, "report too large");
160:
161: (void)signal(SIGHUP, sighup);
162:
163: if (demon) {
164: if (daemon(0, 0) < 0)
165: err(1, "daemon()");
166: pidfile(NULL);
167: isdemon = 1;
168: }
169:
170: for(;;) {
171: n = read(fd, buf, sz);
172: if (verbose > 2) {
173: printf("read %d bytes:", n);
174: for (i = 0; i < n; i++)
175: printf(" %02x", buf[i]);
176: printf("\n");
177: }
178: if (n < 0) {
179: if (verbose)
180: err(1, "read");
181: else
182: exit(1);
183: }
184: #if 0
185: if (n != sz) {
186: err(2, "read size");
187: }
188: #endif
189: for (cmd = commands; cmd; cmd = cmd->next) {
190: val = hid_get_data(buf, &cmd->item);
191: if (cmd->value == val || cmd->anyvalue)
192: docmd(cmd, val, dev, argc, argv);
193: }
194: if (reparse) {
195: struct command *cmds =
196: parse_conf(conf, repd, reportid, ignore);
197: if (cmds) {
198: freecommands(commands);
199: commands = cmds;
200: }
201: reparse = 0;
202: }
203: }
204:
205: exit(0);
206: }
207:
208: void
209: usage(void)
210: {
211: extern char *__progname;
212:
1.12 sobrado 213: fprintf(stderr, "usage: %s [-div] -c config-file -f device arg ...\n",
214: __progname);
1.1 nate 215: exit(1);
216: }
217:
218: static int
219: peek(FILE *f)
220: {
221: int c;
222:
223: c = getc(f);
224: if (c != EOF)
225: ungetc(c, f);
226: return c;
227: }
228:
229: struct command *
230: parse_conf(const char *conf, report_desc_t repd, int reportid, int ignore)
231: {
232: FILE *f;
233: char *p;
234: int line;
235: char buf[SIZE], name[SIZE], value[SIZE], action[SIZE];
236: char usage[SIZE], coll[SIZE];
237: struct command *cmd, *cmds;
238: struct hid_data *d;
239: struct hid_item h;
240: int u, lo, hi, range;
241:
242: f = fopen(conf, "r");
243: if (f == NULL)
244: err(1, "%s", conf);
245:
246: cmds = NULL;
247: for (line = 1; ; line++) {
248: if (fgets(buf, sizeof buf, f) == NULL)
249: break;
250: if (buf[0] == '#' || buf[0] == '\n')
251: continue;
252: p = strchr(buf, '\n');
253: while (p && isspace(peek(f))) {
254: if (fgets(p, sizeof buf - strlen(buf), f) == NULL)
255: break;
256: p = strchr(buf, '\n');
257: }
258: if (p)
259: *p = 0;
260: if (sscanf(buf, "%s %s %[^\n]", name, value, action) != 3) {
261: if (isdemon) {
262: syslog(LOG_WARNING, "config file `%s', line %d"
1.4 deraadt 263: ", syntax error: %s", conf, line, buf);
1.1 nate 264: freecommands(cmds);
1.11 guenther 265: fclose(f);
1.1 nate 266: return (NULL);
267: } else {
1.6 jaredy 268: errx(1, "config file `%s', line %d"
1.4 deraadt 269: ", syntax error: %s", conf, line, buf);
1.1 nate 270: }
271: }
272:
273: cmd = malloc(sizeof *cmd);
274: if (cmd == NULL)
275: err(1, "malloc failed");
276: cmd->next = cmds;
277: cmds = cmd;
278: cmd->line = line;
279:
280: if (strcmp(value, "*") == 0) {
281: cmd->anyvalue = 1;
282: } else {
283: cmd->anyvalue = 0;
284: if (sscanf(value, "%d", &cmd->value) != 1) {
285: if (isdemon) {
286: syslog(LOG_WARNING,
1.4 deraadt 287: "config file `%s', line %d, "
1.6 jaredy 288: "bad value: %s",
1.4 deraadt 289: conf, line, value);
1.1 nate 290: freecommands(cmds);
1.11 guenther 291: fclose(f);
1.1 nate 292: return (NULL);
293: } else {
294: errx(1, "config file `%s', line %d, "
1.6 jaredy 295: "bad value: %s",
1.4 deraadt 296: conf, line, value);
1.1 nate 297: }
298: }
299: }
300:
301: coll[0] = 0;
1.11 guenther 302: d = hid_start_parse(repd, 1 << hid_input, reportid);
303: if (d == NULL)
304: err(1, "hid_start_parse failed");
305: while (hid_get_item(d, &h)) {
1.1 nate 306: if (verbose > 2)
307: printf("kind=%d usage=%x\n", h.kind, h.usage);
308: if (h.flags & HIO_CONST)
309: continue;
310: switch (h.kind) {
311: case hid_input:
312: if (h.usage_minimum != 0 ||
313: h.usage_maximum != 0) {
314: lo = h.usage_minimum;
315: hi = h.usage_maximum;
316: range = 1;
317: } else {
318: lo = h.usage;
319: hi = h.usage;
320: range = 0;
321: }
322: for (u = lo; u <= hi; u++) {
323: snprintf(usage, sizeof usage, "%s:%s",
1.4 deraadt 324: hid_usage_page(HID_PAGE(u)),
1.1 nate 325: hid_usage_in_page(u));
326: if (verbose > 2)
327: printf("usage %s\n", usage);
328: if (!strcasecmp(usage, name))
329: goto foundhid;
330: if (coll[0]) {
331: snprintf(usage, sizeof usage,
332: "%s.%s:%s", coll+1,
1.4 deraadt 333: hid_usage_page(HID_PAGE(u)),
1.1 nate 334: hid_usage_in_page(u));
335: if (verbose > 2)
336: printf("usage %s\n",
1.4 deraadt 337: usage);
1.1 nate 338: if (!strcasecmp(usage, name))
339: goto foundhid;
340: }
341: }
342: break;
343: case hid_collection:
344: snprintf(coll + strlen(coll),
345: sizeof coll - strlen(coll), ".%s:%s",
1.4 deraadt 346: hid_usage_page(HID_PAGE(h.usage)),
1.1 nate 347: hid_usage_in_page(h.usage));
348: break;
349: case hid_endcollection:
350: if (coll[0])
351: *strrchr(coll, '.') = 0;
352: break;
353: default:
354: break;
355: }
356: }
1.11 guenther 357: hid_end_parse(d);
1.1 nate 358: if (ignore) {
359: if (verbose)
1.2 jsyn 360: warnx("ignore item '%s'", name);
1.11 guenther 361: /* pop and free this ignored item */
362: cmds = cmd->next;
363: free(cmd);
1.1 nate 364: continue;
365: }
366: if (isdemon) {
367: syslog(LOG_WARNING, "config file `%s', line %d, HID "
1.6 jaredy 368: "item not found: `%s'", conf, line, name);
1.1 nate 369: freecommands(cmds);
1.11 guenther 370: fclose(f);
1.1 nate 371: return (NULL);
372: } else {
373: errx(1, "config file `%s', line %d, HID item "
1.6 jaredy 374: "not found: `%s'", conf, line, name);
1.1 nate 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,
1.4 deraadt 391: cmd->value, cmd->action);
1.1 nate 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;
1.15 ! jasper 403: pid_t pid;
1.1 nate 404:
1.14 deraadt 405: if (cmd->action == NULL) {
1.13 ckuethe 406: if (verbose)
407: printf("no action for device %s value %d\n",
1.14 deraadt 408: hid, value);
1.13 ckuethe 409: return;
410: }
1.1 nate 411: for (p = cmd->action, q = cmdbuf; *p && q < &cmdbuf[SIZE-1]; ) {
412: if (*p == '$') {
413: p++;
414: len = &cmdbuf[SIZE-1] - q;
415: if (isdigit(*p)) {
416: n = strtol(p, &p, 10) - 1;
417: if (n >= 0 && n < argc) {
418: strncpy(q, argv[n], len);
419: q += strlen(q);
420: }
421: } else if (*p == 'V') {
422: p++;
423: snprintf(q, len, "%d", value);
424: q += strlen(q);
425: } else if (*p == 'N') {
426: p++;
427: strncpy(q, cmd->name, len);
428: q += strlen(q);
429: } else if (*p == 'H') {
430: p++;
431: strncpy(q, hid, len);
432: q += strlen(q);
433: } else if (*p) {
434: *q++ = *p++;
435: }
436: } else {
437: *q++ = *p++;
438: }
439: }
440: *q = 0;
441:
1.15 ! jasper 442: pid = fork();
! 443: if (pid == -1)
! 444: warn("fork failed");
! 445: else if (pid == 0) {
! 446: setpgid(0, 0);
! 447: if (verbose)
! 448: printf("executing '%s'\n", cmdbuf);
! 449: r = execl(_PATH_BSHELL, "sh", "-c", cmdbuf, NULL);
! 450: err(1, "execl");
! 451: }
1.1 nate 452: }
453:
454: void
455: freecommands(struct command *cmd)
456: {
457: struct command *next;
458:
459: while (cmd) {
460: next = cmd->next;
461: free(cmd);
462: cmd = next;
463: }
464: }