479 lines
10 KiB
C
479 lines
10 KiB
C
/* $NetBSD: usbhidaction.c,v 1.29 2018/05/15 01:41:29 jmcneill Exp $ */
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/*
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* Copyright (c) 2000, 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Lennart Augustsson <lennart@augustsson.net>.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: usbhidaction.c,v 1.29 2018/05/15 01:41:29 jmcneill Exp $");
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <err.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <dev/usb/usb.h>
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#include <dev/hid/hid.h>
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#include <usbhid.h>
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#include <util.h>
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#include <syslog.h>
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#include <signal.h>
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#include <util.h>
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static int verbose = 0;
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static int isdemon = 0;
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static int reparse = 0;
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struct command {
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struct command *next;
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int line;
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struct hid_item item;
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int value;
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char anyvalue;
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char *name;
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char *action;
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};
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static struct command *commands;
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#define SIZE 4000
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static void usage(void) __dead;
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static struct command *parse_conf(const char *, report_desc_t, int, int);
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static void docmd(struct command *, int, const char *, int, char **);
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static void freecommands(struct command *);
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static void
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/*ARGSUSED*/
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sighup(int sig)
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{
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reparse = 1;
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}
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int
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main(int argc, char **argv)
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{
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const char *conf = NULL;
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const char *dev = NULL;
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int fd, ch, sz, n, val, i;
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int demon, ignore;
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report_desc_t repd;
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char buf[100];
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char devnamebuf[PATH_MAX];
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struct command *cmd;
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int reportid;
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const char *table = NULL;
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const char *pidfn = NULL;
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setprogname(argv[0]);
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(void)setlinebuf(stdout);
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demon = 1;
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ignore = 0;
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while ((ch = getopt(argc, argv, "c:df:ip:t:v")) != -1) {
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switch(ch) {
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case 'c':
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conf = optarg;
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break;
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case 'd':
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demon ^= 1;
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break;
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case 'i':
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ignore++;
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break;
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case 'f':
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dev = optarg;
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break;
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case 'p':
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pidfn = optarg;
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break;
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case 't':
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table = optarg;
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break;
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case 'v':
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demon = 0;
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verbose++;
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break;
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case '?':
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (conf == NULL || dev == NULL)
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usage();
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hid_init(table);
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if (dev[0] != '/') {
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(void)snprintf(devnamebuf, sizeof(devnamebuf), "/dev/%s%s",
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isdigit((unsigned char)dev[0]) ? "uhid" : "", dev);
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dev = devnamebuf;
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}
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if (demon && conf[0] != '/')
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errx(EXIT_FAILURE,
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"config file must have an absolute path, %s", conf);
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fd = open(dev, O_RDWR | O_CLOEXEC);
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if (fd < 0)
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err(EXIT_FAILURE, "%s", dev);
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if (ioctl(fd, USB_GET_REPORT_ID, &reportid) < 0)
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reportid = -1;
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repd = hid_get_report_desc(fd);
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if (repd == NULL)
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err(EXIT_FAILURE, "hid_get_report_desc() failed");
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commands = parse_conf(conf, repd, reportid, ignore);
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sz = hid_report_size(repd, hid_input, reportid);
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if (verbose)
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(void)printf("report size %d\n", sz);
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if ((size_t)sz > sizeof(buf))
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errx(EXIT_FAILURE, "report too large");
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(void)signal(SIGHUP, sighup);
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if (demon) {
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if (daemon(0, 0) < 0)
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err(EXIT_FAILURE, "daemon()");
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(void)pidfile(pidfn);
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isdemon = 1;
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}
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for(;;) {
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n = read(fd, buf, (size_t)sz);
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if (verbose > 2) {
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(void)printf("read %d bytes:", n);
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for (i = 0; i < n; i++)
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(void)printf(" %02x", buf[i]);
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(void)printf("\n");
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}
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if (n < 0) {
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if (verbose)
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err(EXIT_FAILURE, "read");
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else
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exit(EXIT_FAILURE);
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}
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#if 0
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if (n != sz) {
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err(EXIT_FAILURE, "read size");
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}
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#endif
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for (cmd = commands; cmd; cmd = cmd->next) {
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val = hid_get_data(buf, &cmd->item);
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if (cmd->value == val || cmd->anyvalue)
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docmd(cmd, val, dev, argc, argv);
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}
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if (reparse) {
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struct command *cmds =
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parse_conf(conf, repd, reportid, ignore);
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if (cmds) {
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freecommands(commands);
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commands = cmds;
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}
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reparse = 0;
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}
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}
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: %s -c config_file [-d] -f hid_dev "
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"[-i] [-p pidfile] [-t table] [-v]\n", getprogname());
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exit(EXIT_FAILURE);
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}
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static int
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peek(FILE *f)
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{
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int c;
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c = getc(f);
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if (c != EOF)
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(void)ungetc(c, f);
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return c;
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}
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static struct command *
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parse_conf(const char *conf, report_desc_t repd, int reportid, int ignore)
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{
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FILE *f;
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char *p;
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int line;
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char buf[SIZE], name[SIZE], value[SIZE], action[SIZE];
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char usagestr[SIZE], coll[SIZE];
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struct command *cmd, *cmds;
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struct hid_data *d;
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struct hid_item h;
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int u, lo, hi, range;
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f = fopen(conf, "r");
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if (f == NULL)
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err(EXIT_FAILURE, "%s", conf);
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cmds = NULL;
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for (line = 1; ; line++) {
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if (fgets(buf, sizeof buf, f) == NULL)
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break;
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if (buf[0] == '#' || buf[0] == '\n')
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continue;
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p = strchr(buf, '\n');
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while (p && isspace(peek(f))) {
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if (fgets(p, (int)(sizeof buf - strlen(buf)), f)
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== NULL)
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break;
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p = strchr(buf, '\n');
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}
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if (p)
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*p = '\0';
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/* XXX SIZE == 4000 */
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if (sscanf(buf, "%3999s %3999s %[^\n]", name, value, action) != 3) {
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if (isdemon) {
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syslog(LOG_WARNING, "config file `%s', line %d"
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", syntax error: %s", conf, line, buf);
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freecommands(cmds);
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(void)fclose(f);
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return (NULL);
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} else {
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errx(EXIT_FAILURE, "config file `%s', line %d,"
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", syntax error: %s", conf, line, buf);
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}
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}
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cmd = emalloc(sizeof *cmd);
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cmd->next = cmds;
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cmds = cmd;
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cmd->line = line;
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if (strcmp(value, "*") == 0) {
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cmd->anyvalue = 1;
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} else {
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cmd->anyvalue = 0;
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if (sscanf(value, "%d", &cmd->value) != 1) {
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if (isdemon) {
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syslog(LOG_WARNING,
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"config file `%s', line %d, "
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"bad value: %s\n",
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conf, line, value);
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freecommands(cmds);
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(void)fclose(f);
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return (NULL);
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} else {
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errx(EXIT_FAILURE,
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"config file `%s', line %d, "
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"bad value: %s\n",
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conf, line, value);
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}
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}
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}
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coll[0] = 0;
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for (d = hid_start_parse(repd, 1 << hid_input, reportid);
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hid_get_item(d, &h); ) {
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if (verbose > 2)
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(void)printf("kind=%d usage=%x flags=%x\n",
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h.kind, h.usage, h.flags);
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switch (h.kind) {
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case hid_input:
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if (h.flags & HIO_CONST)
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continue;
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if (h.usage_minimum != 0 ||
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h.usage_maximum != 0) {
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lo = h.usage_minimum;
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hi = h.usage_maximum;
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range = 1;
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} else {
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lo = h.usage;
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hi = h.usage;
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range = 0;
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}
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for (u = lo; u <= hi; u++) {
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(void)snprintf(usagestr,
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sizeof usagestr,
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"%s:%s",
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hid_usage_page((int)HID_PAGE(u)),
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hid_usage_in_page((u_int)u));
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if (verbose > 2)
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(void)printf("usage %s\n",
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usagestr);
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if (!strcasecmp(usagestr, name))
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goto foundhid;
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if (coll[0]) {
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(void)snprintf(usagestr,
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sizeof usagestr,
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"%s.%s:%s", coll + 1,
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hid_usage_page((int)HID_PAGE(u)),
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hid_usage_in_page((u_int)u));
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if (verbose > 2)
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(void)printf(
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"usage %s\n",
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usagestr);
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if (!strcasecmp(usagestr, name))
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goto foundhid;
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}
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}
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break;
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case hid_collection:
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(void)snprintf(coll + strlen(coll),
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sizeof coll - strlen(coll), ".%s:%s",
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hid_usage_page((int)HID_PAGE(h.usage)),
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hid_usage_in_page(h.usage));
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if (verbose > 2)
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(void)printf("coll '%s'\n", coll);
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break;
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case hid_endcollection:
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if (coll[0])
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*strrchr(coll, '.') = 0;
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break;
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default:
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break;
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}
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}
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if (ignore) {
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if (verbose)
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warnx("ignore item '%s'", name);
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continue;
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}
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if (isdemon) {
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syslog(LOG_WARNING, "config file `%s', line %d, HID "
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"item not found: `%s'", conf, line, name);
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freecommands(cmds);
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(void)fclose(f);
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return (NULL);
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} else {
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errx(EXIT_FAILURE, "config file `%s', line %d,"
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" HID item not found: `%s'", conf, line, name);
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}
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foundhid:
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hid_end_parse(d);
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cmd->item = h;
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cmd->name = estrdup(name);
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cmd->action = estrdup(action);
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if (range) {
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if (cmd->value == 1)
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cmd->value = u - lo;
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else
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cmd->value = -1;
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}
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if (verbose) {
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char valuebuf[16];
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if (cmd->anyvalue)
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snprintf(valuebuf, sizeof(valuebuf), "%s", "*");
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else
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snprintf(valuebuf, sizeof(valuebuf), "%d",
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cmd->value);
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(void)printf("PARSE:%d %s, %s, '%s'\n", cmd->line, name,
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valuebuf, cmd->action);
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}
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}
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(void)fclose(f);
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return (cmds);
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}
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static void
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docmd(struct command *cmd, int value, const char *hid, int argc, char **argv)
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{
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char cmdbuf[SIZE], *p, *q;
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size_t len;
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int n, r;
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for (p = cmd->action, q = cmdbuf; *p && q < &cmdbuf[SIZE-1]; ) {
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if (*p == '$') {
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p++;
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len = &cmdbuf[SIZE-1] - q;
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if (isdigit((unsigned char)*p)) {
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n = strtol(p, &p, 10) - 1;
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if (n >= 0 && n < argc) {
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(void)strlcpy(q, argv[n], len);
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q += strlen(q);
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}
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} else if (*p == 'V') {
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p++;
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(void)snprintf(q, len, "%d", value);
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q += strlen(q);
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} else if (*p == 'N') {
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p++;
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(void)strlcpy(q, cmd->name, len);
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q += strlen(q);
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} else if (*p == 'H') {
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p++;
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(void)strlcpy(q, hid, len);
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q += strlen(q);
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} else if (*p) {
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*q++ = *p++;
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}
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} else {
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*q++ = *p++;
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}
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}
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*q = 0;
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if (verbose)
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(void)printf("system '%s'\n", cmdbuf);
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r = system(cmdbuf);
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if (verbose > 1 && r)
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(void)printf("return code = 0x%x\n", r);
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}
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static void
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freecommand(struct command *cmd)
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{
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free(cmd->name);
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free(cmd->action);
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free(cmd);
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}
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static void
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freecommands(struct command *cmd)
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{
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struct command *next;
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while (cmd) {
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next = cmd->next;
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freecommand(cmd);
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cmd = next;
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}
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}
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