/* $NetBSD: usbhidaction.c,v 1.30 2021/04/13 02:07:35 mrg Exp $ */

/* $NetBSD: usbhidaction.c,v 1.30 2021/04/13 02:07:35 mrg Exp $ */

/*
* Copyright (c) 2000, 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Lennart Augustsson <[email protected]>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>

#ifndef lint
__RCSID("$NetBSD: usbhidaction.c,v 1.30 2021/04/13 02:07:35 mrg Exp $");
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <limits.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <dev/usb/usb.h>
#include <dev/hid/hid.h>
#include <usbhid.h>
#include <util.h>
#include <syslog.h>
#include <signal.h>
#include <util.h>

static int verbose = 0;
static int isdemon = 0;
static int reparse = 0;

struct command {
struct command *next;
int line;

struct hid_item item;
int value;
char anyvalue;
char *name;
char *action;
};
static struct command *commands;

#define SIZE 4000

static void usage(void) __dead;
static struct command *parse_conf(const char *, report_desc_t, int, int);
static void docmd(struct command *, int, const char *, int, char **);
static void freecommands(struct command *);

static void
/*ARGSUSED*/
sighup(int sig)
{
reparse = 1;
}

int
main(int argc, char **argv)
{
const char *conf = NULL;
const char *dev = NULL;
int fd, ch, sz, n, val, i;
int demon, ignore;
report_desc_t repd;
char buf[100];
char devnamebuf[PATH_MAX];
struct command *cmd;
int reportid;
const char *table = NULL;
const char *pidfn = NULL;

setprogname(argv[0]);
(void)setlinebuf(stdout);

demon = 1;
ignore = 0;
while ((ch = getopt(argc, argv, "c:df:ip:t:v")) != -1) {
switch(ch) {
case 'c':
conf = optarg;
break;
case 'd':
demon ^= 1;
break;
case 'i':
ignore++;
break;
case 'f':
dev = optarg;
break;
case 'p':
pidfn = optarg;
break;
case 't':
table = optarg;
break;
case 'v':
demon = 0;
verbose++;
break;
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;

if (conf == NULL || dev == NULL)
usage();

hid_init(table);

if (dev[0] != '/') {
(void)snprintf(devnamebuf, sizeof(devnamebuf), "/dev/%s%s",
isdigit((unsigned char)dev[0]) ? "uhid" : "", dev);
dev = devnamebuf;
}

if (demon && conf[0] != '/')
errx(EXIT_FAILURE,
"config file must have an absolute path, %s", conf);

fd = open(dev, O_RDWR | O_CLOEXEC);
if (fd < 0)
err(EXIT_FAILURE, "%s", dev);

if (ioctl(fd, USB_GET_REPORT_ID, &reportid) < 0)
reportid = -1;
repd = hid_get_report_desc(fd);
if (repd == NULL)
err(EXIT_FAILURE, "hid_get_report_desc() failed");

commands = parse_conf(conf, repd, reportid, ignore);

sz = hid_report_size(repd, hid_input, reportid);

if (verbose)
(void)printf("report size %d\n", sz);
if ((size_t)sz > sizeof(buf))
errx(EXIT_FAILURE, "report too large");

(void)signal(SIGHUP, sighup);

if (demon) {
if (daemon(0, 0) < 0)
err(EXIT_FAILURE, "daemon()");
(void)pidfile(pidfn);
isdemon = 1;
}

for(;;) {
n = read(fd, buf, (size_t)sz);
if (verbose > 2) {
(void)printf("read %d bytes:", n);
for (i = 0; i < n; i++)
(void)printf(" %02x", buf[i]);
(void)printf("\n");
}
if (n < 0) {
if (verbose)
err(EXIT_FAILURE, "read");
else
exit(EXIT_FAILURE);
}
#if 0
if (n != sz) {
err(EXIT_FAILURE, "read size");
}
#endif
for (cmd = commands; cmd; cmd = cmd->next) {
val = hid_get_data(buf, &cmd->item);
if (cmd->value == val || cmd->anyvalue)
docmd(cmd, val, dev, argc, argv);
}
if (reparse) {
struct command *cmds =
parse_conf(conf, repd, reportid, ignore);
if (cmds) {
freecommands(commands);
commands = cmds;
}
reparse = 0;
}
}
}

static void
usage(void)
{

(void)fprintf(stderr, "usage: %s -c config_file [-d] -f hid_dev "
"[-i] [-p pidfile] [-t table] [-v]\n", getprogname());
exit(EXIT_FAILURE);
}

static int
peek(FILE *f)
{
int c;

c = getc(f);
if (c != EOF)
(void)ungetc(c, f);
return c;
}

static struct command *
parse_conf(const char *conf, report_desc_t repd, int reportid, int ignore)
{
FILE *f;
char *p;
int line;
char buf[SIZE], name[SIZE], value[SIZE], action[SIZE];
char usagestr[SIZE+1], coll[SIZE];
struct command *cmd, *cmds;
struct hid_data *d;
struct hid_item h;
int u, lo, hi, range;

f = fopen(conf, "r");
if (f == NULL)
err(EXIT_FAILURE, "%s", conf);

cmds = NULL;
for (line = 1; ; line++) {
if (fgets(buf, sizeof buf, f) == NULL)
break;
if (buf[0] == '#' || buf[0] == '\n')
continue;
p = strchr(buf, '\n');
while (p && isspace(peek(f))) {
if (fgets(p, (int)(sizeof buf - strlen(buf)), f)
== NULL)
break;
p = strchr(buf, '\n');
}
if (p)
*p = '\0';
/* XXX SIZE == 4000 */
if (sscanf(buf, "%3999s %3999s %[^\n]", name, value, action) != 3) {
if (isdemon) {
syslog(LOG_WARNING, "config file `%s', line %d"
", syntax error: %s", conf, line, buf);
freecommands(cmds);
(void)fclose(f);
return (NULL);
} else {
errx(EXIT_FAILURE, "config file `%s', line %d,"
", syntax error: %s", conf, line, buf);
}
}

cmd = emalloc(sizeof *cmd);
cmd->next = cmds;
cmds = cmd;
cmd->line = line;

if (strcmp(value, "*") == 0) {
cmd->anyvalue = 1;
} else {
cmd->anyvalue = 0;
if (sscanf(value, "%d", &cmd->value) != 1) {
if (isdemon) {
syslog(LOG_WARNING,
"config file `%s', line %d, "
"bad value: %s\n",
conf, line, value);
freecommands(cmds);
(void)fclose(f);
return (NULL);
} else {
errx(EXIT_FAILURE,
"config file `%s', line %d, "
"bad value: %s\n",
conf, line, value);
}
}
}

coll[0] = 0;
for (d = hid_start_parse(repd, 1 << hid_input, reportid);
hid_get_item(d, &h); ) {
if (verbose > 2)
(void)printf("kind=%d usage=%x flags=%x\n",
h.kind, h.usage, h.flags);
switch (h.kind) {
case hid_input:
if (h.flags & HIO_CONST)
continue;
if (h.usage_minimum != 0 ||
h.usage_maximum != 0) {
lo = h.usage_minimum;
hi = h.usage_maximum;
range = 1;
} else {
lo = h.usage;
hi = h.usage;
range = 0;
}
for (u = lo; u <= hi; u++) {
(void)snprintf(usagestr,
sizeof usagestr,
"%s:%s",
hid_usage_page((int)HID_PAGE(u)),
hid_usage_in_page((u_int)u));
if (verbose > 2)
(void)printf("usage %s\n",
usagestr);
if (!strcasecmp(usagestr, name))
goto foundhid;
if (coll[0]) {
(void)snprintf(usagestr,
sizeof usagestr,
"%s.%s:%s", coll + 1,
hid_usage_page((int)HID_PAGE(u)),
hid_usage_in_page((u_int)u));
if (verbose > 2)
(void)printf(
"usage %s\n",
usagestr);
if (!strcasecmp(usagestr, name))
goto foundhid;
}
}
break;
case hid_collection:
(void)snprintf(coll + strlen(coll),
sizeof coll - strlen(coll), ".%s:%s",
hid_usage_page((int)HID_PAGE(h.usage)),
hid_usage_in_page(h.usage));
if (verbose > 2)
(void)printf("coll '%s'\n", coll);
break;
case hid_endcollection:
if (coll[0])
*strrchr(coll, '.') = 0;
break;
default:
break;
}
}
if (ignore) {
if (verbose)
warnx("ignore item '%s'", name);
continue;
}
if (isdemon) {
syslog(LOG_WARNING, "config file `%s', line %d, HID "
"item not found: `%s'", conf, line, name);
freecommands(cmds);
(void)fclose(f);
return (NULL);
} else {
errx(EXIT_FAILURE, "config file `%s', line %d,"
" HID item not found: `%s'", conf, line, name);
}

foundhid:
hid_end_parse(d);
cmd->item = h;
cmd->name = estrdup(name);
cmd->action = estrdup(action);
if (range) {
if (cmd->value == 1)
cmd->value = u - lo;
else
cmd->value = -1;
}

if (verbose) {
char valuebuf[16];

if (cmd->anyvalue)
snprintf(valuebuf, sizeof(valuebuf), "%s", "*");
else
snprintf(valuebuf, sizeof(valuebuf), "%d",
cmd->value);
(void)printf("PARSE:%d %s, %s, '%s'\n", cmd->line, name,
valuebuf, cmd->action);
}
}
(void)fclose(f);
return (cmds);
}

static void
docmd(struct command *cmd, int value, const char *hid, int argc, char **argv)
{
char cmdbuf[SIZE], *p, *q;
size_t len;
int n, r;

for (p = cmd->action, q = cmdbuf; *p && q < &cmdbuf[SIZE-1]; ) {
if (*p == '$') {
p++;
len = &cmdbuf[SIZE-1] - q;
if (isdigit((unsigned char)*p)) {
n = strtol(p, &p, 10) - 1;
if (n >= 0 && n < argc) {
(void)strlcpy(q, argv[n], len);
q += strlen(q);
}
} else if (*p == 'V') {
p++;
(void)snprintf(q, len, "%d", value);
q += strlen(q);
} else if (*p == 'N') {
p++;
(void)strlcpy(q, cmd->name, len);
q += strlen(q);
} else if (*p == 'H') {
p++;
(void)strlcpy(q, hid, len);
q += strlen(q);
} else if (*p) {
*q++ = *p++;
}
} else {
*q++ = *p++;
}
}
*q = 0;

if (verbose)
(void)printf("system '%s'\n", cmdbuf);
r = system(cmdbuf);
if (verbose > 1 && r)
(void)printf("return code = 0x%x\n", r);
}

static void
freecommand(struct command *cmd)
{
free(cmd->name);
free(cmd->action);
free(cmd);
}

static void
freecommands(struct command *cmd)
{
struct command *next;

while (cmd) {
next = cmd->next;
freecommand(cmd);
cmd = next;
}
}