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/* SPDX-License-Identifier: GPL-2.0+ */
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "fd-util.h"
#include "set.h"
#include "string-util.h"
#include "udev.h"
#include "udevadm.h"
#include "udevadm-util.h"
#include "util.h"
static int verbose;
static int dry_run;
static int exec_list(struct udev_enumerate *udev_enumerate, const char *action, Set *settle_set) {
struct udev_list_entry *entry;
int r;
udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(udev_enumerate)) {
char filename[UTIL_PATH_SIZE];
const char *syspath;
_cleanup_close_ int fd = -1;
syspath = udev_list_entry_get_name(entry);
if (verbose)
printf("%s\n", syspath);
if (dry_run)
continue;
strscpyl(filename, sizeof(filename), syspath, "/uevent", NULL);
fd = open(filename, O_WRONLY|O_CLOEXEC);
if (fd < 0)
continue;
if (settle_set) {
r = set_put_strdup(settle_set, syspath);
if (r < 0)
return log_oom();
}
if (write(fd, action, strlen(action)) < 0)
log_debug_errno(errno, "error writing '%s' to '%s': %m", action, filename);
}
return 0;
}
static const char *keyval(const char *str, const char **val, char *buf, size_t size) {
char *pos;
strscpy(buf, size,str);
pos = strchr(buf, '=');
if (pos != NULL) {
pos[0] = 0;
pos++;
}
*val = pos;
return buf;
}
static int help(void) {
printf("%s trigger [OPTIONS] DEVPATH\n\n"
"Request events from the kernel.\n\n"
" -h --help Show this help\n"
" -V --version Show package version\n"
" -v --verbose Print the list of devices while running\n"
" -n --dry-run Do not actually trigger the events\n"
" -t --type= Type of events to trigger\n"
" devices sysfs devices (default)\n"
" subsystems sysfs subsystems and drivers\n"
" -c --action=ACTION Event action value, default is \"change\"\n"
" -s --subsystem-match=SUBSYSTEM Trigger devices from a matching subsystem\n"
" -S --subsystem-nomatch=SUBSYSTEM Exclude devices from a matching subsystem\n"
" -a --attr-match=FILE[=VALUE] Trigger devices with a matching attribute\n"
" -A --attr-nomatch=FILE[=VALUE] Exclude devices with a matching attribute\n"
" -p --property-match=KEY=VALUE Trigger devices with a matching property\n"
" -g --tag-match=KEY=VALUE Trigger devices with a matching property\n"
" -y --sysname-match=NAME Trigger devices with this /sys path\n"
" --name-match=NAME Trigger devices with this /dev name\n"
" -b --parent-match=NAME Trigger devices with that parent device\n"
" -w --settle Wait for the triggered events to complete\n"
, program_invocation_short_name);
return 0;
}
int trigger_main(int argc, char *argv[], void *userdata) {
enum {
ARG_NAME = 0x100,
};
static const struct option options[] = {
{ "verbose", no_argument, NULL, 'v' },
{ "dry-run", no_argument, NULL, 'n' },
{ "type", required_argument, NULL, 't' },
{ "action", required_argument, NULL, 'c' },
{ "subsystem-match", required_argument, NULL, 's' },
{ "subsystem-nomatch", required_argument, NULL, 'S' },
{ "attr-match", required_argument, NULL, 'a' },
{ "attr-nomatch", required_argument, NULL, 'A' },
{ "property-match", required_argument, NULL, 'p' },
{ "tag-match", required_argument, NULL, 'g' },
{ "sysname-match", required_argument, NULL, 'y' },
{ "name-match", required_argument, NULL, ARG_NAME },
{ "parent-match", required_argument, NULL, 'b' },
{ "settle", no_argument, NULL, 'w' },
{ "version", no_argument, NULL, 'V' },
{ "help", no_argument, NULL, 'h' },
{}
};
enum {
TYPE_DEVICES,
TYPE_SUBSYSTEMS,
} device_type = TYPE_DEVICES;
const char *action = "change";
_cleanup_(udev_enumerate_unrefp) struct udev_enumerate *udev_enumerate = NULL;
_cleanup_(udev_monitor_unrefp) struct udev_monitor *udev_monitor = NULL;
_cleanup_close_ int fd_ep = -1;
int fd_udev = -1;
struct epoll_event ep_udev;
bool settle = false;
_cleanup_set_free_free_ Set *settle_set = NULL;
int c, r;
udev_enumerate = udev_enumerate_new(NULL);
if (!udev_enumerate)
return -errno;
while ((c = getopt_long(argc, argv, "vnt:c:s:S:a:A:p:g:y:b:wVh", options, NULL)) >= 0) {
const char *key;
const char *val;
char buf[UTIL_PATH_SIZE];
switch (c) {
case 'v':
verbose = 1;
break;
case 'n':
dry_run = 1;
break;
case 't':
if (streq(optarg, "devices"))
device_type = TYPE_DEVICES;
else if (streq(optarg, "subsystems"))
device_type = TYPE_SUBSYSTEMS;
else {
log_error("unknown type --type=%s", optarg);
return -EINVAL;
}
break;
case 'c':
if (STR_IN_SET(optarg, "add", "remove", "change"))
action = optarg;
else {
log_error("unknown action '%s'", optarg);
return -EINVAL;
}
break;
case 's':
r = udev_enumerate_add_match_subsystem(udev_enumerate, optarg);
if (r < 0)
return log_error_errno(r, "could not add subsystem match '%s': %m", optarg);
break;
case 'S':
r = udev_enumerate_add_nomatch_subsystem(udev_enumerate, optarg);
if (r < 0)
return log_error_errno(r, "could not add negative subsystem match '%s': %m", optarg);
break;
case 'a':
key = keyval(optarg, &val, buf, sizeof(buf));
r = udev_enumerate_add_match_sysattr(udev_enumerate, key, val);
if (r < 0)
return log_error_errno(r, "could not add sysattr match '%s=%s': %m", key, val);
break;
case 'A':
key = keyval(optarg, &val, buf, sizeof(buf));
r = udev_enumerate_add_nomatch_sysattr(udev_enumerate, key, val);
if (r < 0)
return log_error_errno(r, "could not add negative sysattr match '%s=%s': %m", key, val);
break;
case 'p':
key = keyval(optarg, &val, buf, sizeof(buf));
r = udev_enumerate_add_match_property(udev_enumerate, key, val);
if (r < 0)
return log_error_errno(r, "could not add property match '%s=%s': %m", key, val);
break;
case 'g':
r = udev_enumerate_add_match_tag(udev_enumerate, optarg);
if (r < 0)
return log_error_errno(r, "could not add tag match '%s': %m", optarg);
break;
case 'y':
r = udev_enumerate_add_match_sysname(udev_enumerate, optarg);
if (r < 0)
return log_error_errno(r, "could not add sysname match '%s': %m", optarg);
break;
case 'b': {
_cleanup_(udev_device_unrefp) struct udev_device *dev;
dev = find_device(optarg, "/sys");
if (!dev)
return log_error_errno(errno, "unable to open the device '%s'", optarg);
r = udev_enumerate_add_match_parent(udev_enumerate, dev);
if (r < 0)
return log_error_errno(r, "could not add parent match '%s': %m", optarg);
break;
}
case 'w':
settle = true;
break;
case ARG_NAME: {
_cleanup_(udev_device_unrefp) struct udev_device *dev;
dev = find_device(optarg, "/dev/");
if (!dev)
return log_error_errno(errno, "unable to open the device '%s'", optarg);
r = udev_enumerate_add_match_parent(udev_enumerate, dev);
if (r < 0)
return log_error_errno(r, "could not add parent match '%s': %m", optarg);
break;
}
case 'V':
return version();
case 'h':
return help();
case '?':
return -EINVAL;
default:
assert_not_reached("Unknown option");
}
}
for (; optind < argc; optind++) {
_cleanup_(udev_device_unrefp) struct udev_device *dev;
dev = find_device(argv[optind], NULL);
if (!dev) {
log_error("unable to open the device '%s'", argv[optind]);
return -EINVAL;
}
r = udev_enumerate_add_match_parent(udev_enumerate, dev);
if (r < 0)
return log_error_errno(r, "could not add tag match '%s': %m", optarg);
}
if (settle) {
fd_ep = epoll_create1(EPOLL_CLOEXEC);
if (fd_ep < 0)
return log_error_errno(errno, "error creating epoll fd: %m");
udev_monitor = udev_monitor_new_from_netlink(NULL, "udev");
if (!udev_monitor)
return log_error_errno(errno, "error: unable to create netlink socket: %m");
fd_udev = udev_monitor_get_fd(udev_monitor);
r = udev_monitor_enable_receiving(udev_monitor);
if (r < 0)
return log_error_errno(r, "error: unable to subscribe to udev events: %m");
ep_udev = (struct epoll_event) { .events = EPOLLIN, .data.fd = fd_udev };
if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_udev, &ep_udev) < 0)
return log_error_errno(errno, "fail to add fd to epoll: %m");
settle_set = set_new(&string_hash_ops);
if (!settle_set)
return log_oom();
}
switch (device_type) {
case TYPE_SUBSYSTEMS:
udev_enumerate_scan_subsystems(udev_enumerate);
break;
case TYPE_DEVICES:
udev_enumerate_scan_devices(udev_enumerate);
break;
default:
assert_not_reached("device_type");
}
r = exec_list(udev_enumerate, action, settle_set);
if (r < 0)
return r;
while (!set_isempty(settle_set)) {
int fdcount;
struct epoll_event ev[4];
int i;
fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
if (fdcount < 0) {
if (errno != EINTR)
log_error_errno(errno, "error receiving uevent message: %m");
continue;
}
for (i = 0; i < fdcount; i++) {
if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) {
_cleanup_(udev_device_unrefp) struct udev_device *device;
const char *syspath = NULL;
device = udev_monitor_receive_device(udev_monitor);
if (!device)
continue;
syspath = udev_device_get_syspath(device);
if (verbose)
printf("settle %s\n", syspath);
if (!set_remove(settle_set, syspath))
log_debug("Got epoll event on syspath %s not present in syspath set", syspath);
}
}
}
return 0;
}
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