#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/usb/usbhid.h>
#include <usbhid.h>
#include <syslog.h>
#include <signal.h>
#include <paths.h>
int verbose = 0;
int isdemon = 0;
volatile sig_atomic_t reparse = 0;
struct command {
struct command *next;
int line;
struct hid_item item;
int value;
char anyvalue;
char *name;
char *action;
};
struct command *commands;
#define SIZE 4000
void usage(void);
struct command *parse_conf(const char *, report_desc_t, int, int);
void docmd(struct command *, int, const char *, int, char **);
void freecommands(struct command *);
static void
sighup(int signo)
{
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;
demon = 1;
ignore = 0;
while ((ch = getopt(argc, argv, "c:df:iv")) != -1) {
switch(ch) {
case 'c':
conf = optarg;
break;
case 'd':
demon ^= 1;
break;
case 'i':
ignore++;
break;
case 'f':
dev = optarg;
break;
case 'v':
demon = 0;
verbose++;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (conf == NULL || dev == NULL)
usage();
if (hid_start(NULL) == -1)
errx(1, "hid_init");
if (dev[0] != '/') {
snprintf(devnamebuf, sizeof(devnamebuf), "/dev/%s%s",
isdigit((unsigned char)dev[0]) ? "uhid" : "", dev);
dev = devnamebuf;
}
if (demon && conf[0] != '/')
errx(1, "config file must have an absolute path, %s", conf);
fd = open(dev, O_RDWR | O_CLOEXEC);
if (fd == -1)
err(1, "%s", dev);
if (ioctl(fd, USB_GET_REPORT_ID, &reportid) == -1)
reportid = -1;
repd = hid_get_report_desc(fd);
if (repd == NULL)
err(1, "hid_get_report_desc() failed");
commands = parse_conf(conf, repd, reportid, ignore);
sz = hid_report_size(repd, hid_input, reportid);
if (verbose)
printf("report size %d\n", sz);
if (sz > sizeof buf)
errx(1, "report too large");
(void)signal(SIGHUP, sighup);
(void)signal(SIGCHLD, SIG_IGN);
if (demon) {
if (daemon(0, 0) == -1)
err(1, "daemon()");
isdemon = 1;
}
if (unveil(conf, "r") == -1)
err(1, "unveil %s", conf);
if (unveil(_PATH_BSHELL, "x") == -1)
err(1, "unveil %s", _PATH_BSHELL);
if (unveil(NULL, NULL) == -1)
err(1, "unveil");
for(;;) {
n = read(fd, buf, sz);
if (verbose > 2) {
printf("read %d bytes:", n);
for (i = 0; i < n; i++)
printf(" %02x", buf[i]);
printf("\n");
}
if (n == -1) {
if (verbose)
err(1, "read");
else
exit(1);
}
if (n != sz) {
err(2, "read size");
}
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;
}
}
exit(0);
}
void
usage(void)
{
extern char *__progname;
fprintf(stderr, "usage: %s [-div] -c config-file -f device arg ...\n",
__progname);
exit(1);
}
static int
peek(FILE *f)
{
int c;
c = getc(f);
if (c != EOF)
ungetc(c, f);
return c;
}
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 usage[SIZE], 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(1, "%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, sizeof buf - strlen(buf), f) == NULL)
break;
p = strchr(buf, '\n');
}
if (p)
*p = 0;
if (sscanf(buf, "%s %s %[^\n]", name, value, action) != 3) {
if (isdemon) {
syslog(LOG_WARNING, "config file `%s', line %d"
", syntax error: %s", conf, line, buf);
freecommands(cmds);
fclose(f);
return (NULL);
} else {
errx(1, "config file `%s', line %d"
", syntax error: %s", conf, line, buf);
}
}
cmd = malloc(sizeof *cmd);
if (cmd == NULL)
err(1, "malloc failed");
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",
conf, line, value);
freecommands(cmds);
fclose(f);
return (NULL);
} else {
errx(1, "config file `%s', line %d, "
"bad value: %s",
conf, line, value);
}
}
}
coll[0] = 0;
d = hid_start_parse(repd, 1 << hid_input, reportid);
if (d == NULL)
err(1, "hid_start_parse failed");
while (hid_get_item(d, &h)) {
if (verbose > 2)
printf("kind=%d usage=%x\n", h.kind, h.usage);
if (h.flags & HIO_CONST)
continue;
switch (h.kind) {
case hid_input:
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++) {
snprintf(usage, sizeof usage, "%s:%s",
hid_usage_page(HID_PAGE(u)),
hid_usage_in_page(u));
if (verbose > 2)
printf("usage %s\n", usage);
if (!strcasecmp(usage, name))
goto foundhid;
if (coll[0]) {
snprintf(usage, sizeof usage,
"%s.%s:%s", coll+1,
hid_usage_page(HID_PAGE(u)),
hid_usage_in_page(u));
if (verbose > 2)
printf("usage %s\n",
usage);
if (!strcasecmp(usage, name))
goto foundhid;
}
}
break;
case hid_collection:
snprintf(coll + strlen(coll),
sizeof coll - strlen(coll), ".%s:%s",
hid_usage_page(HID_PAGE(h.usage)),
hid_usage_in_page(h.usage));
break;
case hid_endcollection:
if (coll[0])
*strrchr(coll, '.') = 0;
break;
default:
break;
}
}
hid_end_parse(d);
if (ignore) {
if (verbose)
warnx("ignore item '%s'", name);
cmds = cmd->next;
free(cmd);
continue;
}
if (isdemon) {
syslog(LOG_WARNING, "config file `%s', line %d, HID "
"item not found: `%s'", conf, line, name);
freecommands(cmds);
fclose(f);
return (NULL);
} else {
errx(1, "config file `%s', line %d, HID item "
"not found: `%s'", conf, line, name);
}
foundhid:
hid_end_parse(d);
cmd->item = h;
cmd->name = strdup(name);
cmd->action = strdup(action);
if (range) {
if (cmd->value == 1)
cmd->value = u - lo;
else
cmd->value = -1;
}
if (verbose)
printf("PARSE:%d %s, %d, '%s'\n", cmd->line, name,
cmd->value, cmd->action);
}
fclose(f);
return (cmds);
}
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;
pid_t pid;
if (cmd->action == NULL) {
if (verbose)
printf("no action for device %s value %d\n",
hid, value);
return;
}
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) {
strncpy(q, argv[n], len);
q += strlen(q);
}
} else if (*p == 'V') {
p++;
snprintf(q, len, "%d", value);
q += strlen(q);
} else if (*p == 'N') {
p++;
strncpy(q, cmd->name, len);
q += strlen(q);
} else if (*p == 'H') {
p++;
strncpy(q, hid, len);
q += strlen(q);
} else if (*p) {
*q++ = *p++;
}
} else {
*q++ = *p++;
}
}
*q = 0;
pid = fork();
if (pid == -1)
warn("fork failed");
else if (pid == 0) {
setpgid(0, 0);
if (verbose)
printf("executing '%s'\n", cmdbuf);
r = execl(_PATH_BSHELL, "sh", "-c", cmdbuf, (char *)NULL);
err(1, "execl");
}
}
void
freecommands(struct command *cmd)
{
struct command *next;
while (cmd) {
next = cmd->next;
free(cmd);
cmd = next;
}
}
