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1.25 ! mestre 1: /* $OpenBSD: usbhidaction.c,v 1.24 2021/12/15 11:23:09 mestre 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 <syslog.h>
47: #include <signal.h>
1.15 jasper 48: #include <paths.h>
1.1 nate 49:
50: int verbose = 0;
51: int isdemon = 0;
1.9 deraadt 52:
53: volatile sig_atomic_t reparse = 0;
1.1 nate 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: struct command *parse_conf(const char *, report_desc_t, int, int);
71: void docmd(struct command *, int, const char *, int, char **);
72: void freecommands(struct command *);
73:
1.5 deraadt 74: /* ARGSUSED */
1.1 nate 75: static void
1.5 deraadt 76: sighup(int signo)
1.1 nate 77: {
78: reparse = 1;
79: }
80:
81: int
82: main(int argc, char **argv)
83: {
84: const char *conf = NULL;
85: const char *dev = NULL;
86: int fd, ch, sz, n, val, i;
87: int demon, ignore;
88: report_desc_t repd;
89: char buf[100];
90: char devnamebuf[PATH_MAX];
91: struct command *cmd;
92: int reportid;
93:
94: demon = 1;
95: ignore = 0;
96: while ((ch = getopt(argc, argv, "c:df:iv")) != -1) {
97: switch(ch) {
98: case 'c':
99: conf = optarg;
100: break;
101: case 'd':
102: demon ^= 1;
103: break;
104: case 'i':
105: ignore++;
106: break;
107: case 'f':
108: dev = optarg;
109: break;
110: case 'v':
111: demon = 0;
112: verbose++;
113: break;
114: case '?':
115: default:
116: usage();
117: }
118: }
119: argc -= optind;
120: argv += optind;
121:
122: if (conf == NULL || dev == NULL)
123: usage();
124:
1.4 deraadt 125: if (hid_start(NULL) == -1)
126: errx(1, "hid_init");
1.1 nate 127:
128: if (dev[0] != '/') {
129: snprintf(devnamebuf, sizeof(devnamebuf), "/dev/%s%s",
1.17 deraadt 130: isdigit((unsigned char)dev[0]) ? "uhid" : "", dev);
1.1 nate 131: dev = devnamebuf;
132: }
1.8 mk 133:
134: if (demon && conf[0] != '/')
135: errx(1, "config file must have an absolute path, %s", conf);
1.1 nate 136:
1.18 guenther 137: fd = open(dev, O_RDWR | O_CLOEXEC);
1.23 deraadt 138: if (fd == -1)
1.1 nate 139: err(1, "%s", dev);
1.7 fgsch 140:
1.23 deraadt 141: if (ioctl(fd, USB_GET_REPORT_ID, &reportid) == -1)
1.1 nate 142: reportid = -1;
143: repd = hid_get_report_desc(fd);
144: if (repd == NULL)
1.2 jsyn 145: err(1, "hid_get_report_desc() failed");
1.1 nate 146:
147: commands = parse_conf(conf, repd, reportid, ignore);
148:
149: sz = hid_report_size(repd, hid_input, reportid);
150:
151: if (verbose)
152: printf("report size %d\n", sz);
153: if (sz > sizeof buf)
154: errx(1, "report too large");
155:
156: (void)signal(SIGHUP, sighup);
1.16 robert 157:
158: /* we do not care about the children, so ignore them */
159: (void)signal(SIGCHLD, SIG_IGN);
1.1 nate 160:
161: if (demon) {
1.23 deraadt 162: if (daemon(0, 0) == -1)
1.1 nate 163: err(1, "daemon()");
164: isdemon = 1;
165: }
1.24 mestre 166:
167: if (unveil(conf, "r") == -1)
168: err(1, "unveil %s", conf);
1.25 ! mestre 169: if (unveil(_PATH_BSHELL, "x") == -1)
! 170: err(1, "unveil %s", _PATH_BSHELL);
1.24 mestre 171: if (unveil(NULL, NULL) == -1)
172: err(1, "unveil");
1.1 nate 173:
174: for(;;) {
175: n = read(fd, buf, sz);
176: if (verbose > 2) {
177: printf("read %d bytes:", n);
178: for (i = 0; i < n; i++)
179: printf(" %02x", buf[i]);
180: printf("\n");
181: }
1.23 deraadt 182: if (n == -1) {
1.1 nate 183: if (verbose)
184: err(1, "read");
185: else
186: exit(1);
187: }
188: if (n != sz) {
189: err(2, "read size");
190: }
191: for (cmd = commands; cmd; cmd = cmd->next) {
192: val = hid_get_data(buf, &cmd->item);
193: if (cmd->value == val || cmd->anyvalue)
194: docmd(cmd, val, dev, argc, argv);
195: }
196: if (reparse) {
197: struct command *cmds =
198: parse_conf(conf, repd, reportid, ignore);
199: if (cmds) {
200: freecommands(commands);
201: commands = cmds;
202: }
203: reparse = 0;
204: }
205: }
206:
207: exit(0);
208: }
209:
210: void
211: usage(void)
212: {
213: extern char *__progname;
214:
1.12 sobrado 215: fprintf(stderr, "usage: %s [-div] -c config-file -f device arg ...\n",
216: __progname);
1.1 nate 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: f = fopen(conf, "r");
245: if (f == NULL)
246: err(1, "%s", conf);
247:
248: cmds = NULL;
249: for (line = 1; ; line++) {
250: if (fgets(buf, sizeof buf, f) == NULL)
251: break;
252: if (buf[0] == '#' || buf[0] == '\n')
253: continue;
254: p = strchr(buf, '\n');
255: while (p && isspace(peek(f))) {
256: if (fgets(p, sizeof buf - strlen(buf), f) == NULL)
257: break;
258: p = strchr(buf, '\n');
259: }
260: if (p)
261: *p = 0;
262: if (sscanf(buf, "%s %s %[^\n]", name, value, action) != 3) {
263: if (isdemon) {
264: syslog(LOG_WARNING, "config file `%s', line %d"
1.4 deraadt 265: ", syntax error: %s", conf, line, buf);
1.1 nate 266: freecommands(cmds);
1.11 guenther 267: fclose(f);
1.1 nate 268: return (NULL);
269: } else {
1.6 jaredy 270: errx(1, "config file `%s', line %d"
1.4 deraadt 271: ", syntax error: %s", conf, line, buf);
1.1 nate 272: }
273: }
274:
275: cmd = malloc(sizeof *cmd);
276: if (cmd == NULL)
277: err(1, "malloc failed");
278: cmd->next = cmds;
279: cmds = cmd;
280: cmd->line = line;
281:
282: if (strcmp(value, "*") == 0) {
283: cmd->anyvalue = 1;
284: } else {
285: cmd->anyvalue = 0;
286: if (sscanf(value, "%d", &cmd->value) != 1) {
287: if (isdemon) {
288: syslog(LOG_WARNING,
1.4 deraadt 289: "config file `%s', line %d, "
1.6 jaredy 290: "bad value: %s",
1.4 deraadt 291: conf, line, value);
1.1 nate 292: freecommands(cmds);
1.11 guenther 293: fclose(f);
1.1 nate 294: return (NULL);
295: } else {
296: errx(1, "config file `%s', line %d, "
1.6 jaredy 297: "bad value: %s",
1.4 deraadt 298: conf, line, value);
1.1 nate 299: }
300: }
301: }
302:
303: coll[0] = 0;
1.11 guenther 304: d = hid_start_parse(repd, 1 << hid_input, reportid);
305: if (d == NULL)
306: err(1, "hid_start_parse failed");
307: while (hid_get_item(d, &h)) {
1.1 nate 308: if (verbose > 2)
309: printf("kind=%d usage=%x\n", h.kind, h.usage);
310: if (h.flags & HIO_CONST)
311: continue;
312: switch (h.kind) {
313: case hid_input:
314: if (h.usage_minimum != 0 ||
315: h.usage_maximum != 0) {
316: lo = h.usage_minimum;
317: hi = h.usage_maximum;
318: range = 1;
319: } else {
320: lo = h.usage;
321: hi = h.usage;
322: range = 0;
323: }
324: for (u = lo; u <= hi; u++) {
325: snprintf(usage, sizeof usage, "%s:%s",
1.4 deraadt 326: hid_usage_page(HID_PAGE(u)),
1.1 nate 327: hid_usage_in_page(u));
328: if (verbose > 2)
329: printf("usage %s\n", usage);
330: if (!strcasecmp(usage, name))
331: goto foundhid;
332: if (coll[0]) {
333: snprintf(usage, sizeof usage,
334: "%s.%s:%s", coll+1,
1.4 deraadt 335: hid_usage_page(HID_PAGE(u)),
1.1 nate 336: hid_usage_in_page(u));
337: if (verbose > 2)
338: printf("usage %s\n",
1.4 deraadt 339: usage);
1.1 nate 340: if (!strcasecmp(usage, name))
341: goto foundhid;
342: }
343: }
344: break;
345: case hid_collection:
346: snprintf(coll + strlen(coll),
347: sizeof coll - strlen(coll), ".%s:%s",
1.4 deraadt 348: hid_usage_page(HID_PAGE(h.usage)),
1.1 nate 349: hid_usage_in_page(h.usage));
350: break;
351: case hid_endcollection:
352: if (coll[0])
353: *strrchr(coll, '.') = 0;
354: break;
355: default:
356: break;
357: }
358: }
1.11 guenther 359: hid_end_parse(d);
1.1 nate 360: if (ignore) {
361: if (verbose)
1.2 jsyn 362: warnx("ignore item '%s'", name);
1.11 guenther 363: /* pop and free this ignored item */
364: cmds = cmd->next;
365: free(cmd);
1.1 nate 366: continue;
367: }
368: if (isdemon) {
369: syslog(LOG_WARNING, "config file `%s', line %d, HID "
1.6 jaredy 370: "item not found: `%s'", conf, line, name);
1.1 nate 371: freecommands(cmds);
1.11 guenther 372: fclose(f);
1.1 nate 373: return (NULL);
374: } else {
375: errx(1, "config file `%s', line %d, HID item "
1.6 jaredy 376: "not found: `%s'", conf, line, name);
1.1 nate 377: }
378:
379: foundhid:
380: hid_end_parse(d);
381: cmd->item = h;
382: cmd->name = strdup(name);
383: cmd->action = strdup(action);
384: if (range) {
385: if (cmd->value == 1)
386: cmd->value = u - lo;
387: else
388: cmd->value = -1;
389: }
390:
391: if (verbose)
392: printf("PARSE:%d %s, %d, '%s'\n", cmd->line, name,
1.4 deraadt 393: cmd->value, cmd->action);
1.1 nate 394: }
395: fclose(f);
396: return (cmds);
397: }
398:
399: void
400: docmd(struct command *cmd, int value, const char *hid, int argc, char **argv)
401: {
402: char cmdbuf[SIZE], *p, *q;
403: size_t len;
404: int n, r;
1.15 jasper 405: pid_t pid;
1.1 nate 406:
1.14 deraadt 407: if (cmd->action == NULL) {
1.13 ckuethe 408: if (verbose)
409: printf("no action for device %s value %d\n",
1.14 deraadt 410: hid, value);
1.13 ckuethe 411: return;
412: }
1.1 nate 413: for (p = cmd->action, q = cmdbuf; *p && q < &cmdbuf[SIZE-1]; ) {
414: if (*p == '$') {
415: p++;
416: len = &cmdbuf[SIZE-1] - q;
1.17 deraadt 417: if (isdigit((unsigned char)*p)) {
1.1 nate 418: n = strtol(p, &p, 10) - 1;
419: if (n >= 0 && n < argc) {
420: strncpy(q, argv[n], len);
421: q += strlen(q);
422: }
423: } else if (*p == 'V') {
424: p++;
425: snprintf(q, len, "%d", value);
426: q += strlen(q);
427: } else if (*p == 'N') {
428: p++;
429: strncpy(q, cmd->name, len);
430: q += strlen(q);
431: } else if (*p == 'H') {
432: p++;
433: strncpy(q, hid, len);
434: q += strlen(q);
435: } else if (*p) {
436: *q++ = *p++;
437: }
438: } else {
439: *q++ = *p++;
440: }
441: }
442: *q = 0;
443:
1.15 jasper 444: pid = fork();
445: if (pid == -1)
446: warn("fork failed");
447: else if (pid == 0) {
448: setpgid(0, 0);
449: if (verbose)
450: printf("executing '%s'\n", cmdbuf);
1.22 krw 451: r = execl(_PATH_BSHELL, "sh", "-c", cmdbuf, (char *)NULL);
1.15 jasper 452: err(1, "execl");
453: }
1.1 nate 454: }
455:
456: void
457: freecommands(struct command *cmd)
458: {
459: struct command *next;
460:
461: while (cmd) {
462: next = cmd->next;
463: free(cmd);
464: cmd = next;
465: }
466: }