예제 #1
0
void udev_event_unref(struct udev_event *event) {
        if (event == NULL)
                return;
        udev_list_cleanup(&event->run_list);
        udev_list_cleanup(&event->seclabel_list);
        free(event->program_result);
        free(event->name);
        free(event);
}
예제 #2
0
/**
 * udev_device_unref:
 * @udev_device: udev device
 *
 * Drop a reference of a udev device. If the refcount reaches zero,
 * the resources of the device will be released.
 *
 * Returns: #NULL
 **/
_public_ struct udev_device *udev_device_unref(struct udev_device *udev_device)
{
        if (udev_device && (-- udev_device->refcount) == 0) {
                sd_device_unref(udev_device->device);
                udev_device_unref(udev_device->parent);

                udev_list_cleanup(&udev_device->properties);
                udev_list_cleanup(&udev_device->sysattrs);
                udev_list_cleanup(&udev_device->tags);
                udev_list_cleanup(&udev_device->devlinks);

                free(udev_device);
        }

        return NULL;
}
예제 #3
0
/**
 * udev_unref:
 * @udev: udev library context
 *
 * Drop a reference of the udev library context. If the refcount
 * reaches zero, the resources of the context will be released.
 *
 * Returns: the passed udev library context if it has still an active reference, or #NULL otherwise.
 **/
_public_ struct udev *udev_unref(struct udev *udev)
{
        if (udev == NULL)
                return NULL;
        udev->refcount--;
        if (udev->refcount > 0)
                return udev;
        udev_list_cleanup(&udev->properties_list);
        free(udev);
        return NULL;
}
예제 #4
0
/**
 * udev_device_get_sysattr_list_entry:
 * @udev_device: udev device
 *
 * Retrieve the list of available sysattrs, with value being empty;
 * This just return all available sysfs attributes for a particular
 * device without reading their values.
 *
 * Returns: the first entry of the property list
 **/
_public_ struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device)
{
        assert_return_errno(udev_device, NULL, EINVAL);

        if (!udev_device->sysattrs_read) {
                const char *sysattr;

                udev_list_cleanup(&udev_device->sysattrs);

                FOREACH_DEVICE_SYSATTR(udev_device->device, sysattr)
                        udev_list_entry_add(&udev_device->sysattrs, sysattr, NULL);

                udev_device->sysattrs_read = true;
        }

        return udev_list_get_entry(&udev_device->sysattrs);
}
예제 #5
0
/**
 * udev_device_get_tags_list_entry:
 * @udev_device: udev device
 *
 * Retrieve the list of tags attached to the udev device. The next
 * list entry can be retrieved with udev_list_entry_get_next(),
 * which returns #NULL if no more entries exist. The tag string
 * can be retrieved from the list entry by udev_list_entry_get_name().
 *
 * Returns: the first entry of the tag list
 **/
_public_ struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device)
{
        assert_return_errno(udev_device, NULL, EINVAL);

        if (device_get_tags_generation(udev_device->device) != udev_device->tags_generation ||
            !udev_device->tags_read) {
                const char *tag;

                udev_list_cleanup(&udev_device->tags);

                FOREACH_DEVICE_TAG(udev_device->device, tag)
                        udev_list_entry_add(&udev_device->tags, tag, NULL);

                udev_device->tags_read = true;
                udev_device->tags_generation = device_get_tags_generation(udev_device->device);
        }

        return udev_list_get_entry(&udev_device->tags);
}
예제 #6
0
/**
 * udev_device_get_event_properties_entry:
 * @udev_device: udev device
 *
 * Retrieve the list of key/value device properties of the udev
 * device. The next list entry can be retrieved with udev_list_entry_get_next(),
 * which returns #NULL if no more entries exist. The property name
 * can be retrieved from the list entry by udev_list_entry_get_name(),
 * the property value by udev_list_entry_get_value().
 *
 * Returns: the first entry of the property list
 **/
_public_ struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
{
        assert_return_errno(udev_device, NULL, EINVAL);

        if (device_get_properties_generation(udev_device->device) != udev_device->properties_generation ||
            !udev_device->properties_read) {
                const char *key, *value;

                udev_list_cleanup(&udev_device->properties);

                FOREACH_DEVICE_PROPERTY(udev_device->device, key, value)
                        udev_list_entry_add(&udev_device->properties, key, value);

                udev_device->properties_read = true;
                udev_device->properties_generation = device_get_properties_generation(udev_device->device);
        }

        return udev_list_get_entry(&udev_device->properties);
}
예제 #7
0
/**
 * udev_device_get_devlinks_list_entry:
 * @udev_device: udev device
 *
 * Retrieve the list of device links pointing to the device file of
 * the udev device. The next list entry can be retrieved with
 * udev_list_entry_get_next(), which returns #NULL if no more entries exist.
 * The devlink path can be retrieved from the list entry by
 * udev_list_entry_get_name(). The path is an absolute path, and starts with
 * the device directory.
 *
 * Returns: the first entry of the device node link list
 **/
_public_ struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
{
        assert_return_errno(udev_device, NULL, EINVAL);

        if (device_get_devlinks_generation(udev_device->device) != udev_device->devlinks_generation ||
            !udev_device->devlinks_read) {
                const char *devlink;

                udev_list_cleanup(&udev_device->devlinks);

                FOREACH_DEVICE_DEVLINK(udev_device->device, devlink)
                        udev_list_entry_add(&udev_device->devlinks, devlink, NULL);

                udev_device->devlinks_read = true;
                udev_device->devlinks_generation = device_get_devlinks_generation(udev_device->device);
        }

        return udev_list_get_entry(&udev_device->devlinks);
}
예제 #8
0
static int64_t trie_store_nodes(struct trie_f *trie, struct trie_node *node) {
        uint64_t i;
        struct trie_node_f n = {
                .prefix_off = htole64(trie->strings_off + node->prefix_off),
                .children_count = node->children_count,
                .values_count = htole64(node->values_count),
        };
        struct trie_child_entry_f *children = NULL;
        int64_t node_off;

        if (node->children_count) {
                children = new0(struct trie_child_entry_f, node->children_count);
                if (!children)
                        return -ENOMEM;
        }

        /* post-order recursion */
        for (i = 0; i < node->children_count; i++) {
                int64_t child_off;

                child_off = trie_store_nodes(trie, node->children[i].child);
                if (child_off < 0) {
                        free(children);
                        return child_off;
                }
                children[i].c = node->children[i].c;
                children[i].child_off = htole64(child_off);
        }

        /* write node */
        node_off = ftello(trie->f);
        if (fwrite(&n, sizeof(struct trie_node_f), 1, trie->f) != 1)
                log_error("Failed to write sizeof struct trie_node_f to n in %s\n", "[udevadm-hwdb.c:trie_store_nodes]");
        trie->nodes_count++;

        /* append children array */
        if (node->children_count) {
                if (fwrite(children, sizeof(struct trie_child_entry_f), node->children_count, trie->f) != node->children_count)
                        log_error("Failed to write children_count in %s\n", "[udevadm-hwdb.c:trie_store_nodes]");
                trie->children_count += node->children_count;
                free(children);
        }

        /* append values array */
        for (i = 0; i < node->values_count; i++) {
                struct trie_value_entry_f v = {
                        .key_off = htole64(trie->strings_off + node->values[i].key_off),
                        .value_off = htole64(trie->strings_off + node->values[i].value_off),
                };

                if (fwrite(&v, sizeof(struct trie_value_entry_f), 1, trie->f) != 1)
                        log_error("Failed to write sizeof trie_value_entry_f to v in %s\n", "[udevadm-hwdb.c:trie_store_nodes]");
                trie->values_count++;
        }

        return node_off;
}

static int trie_store(struct trie *trie, const char *filename) {
        struct trie_f t = {
                .trie = trie,
        };
        char *filename_tmp;
        int64_t pos;
        int64_t root_off;
        int64_t size;
        struct trie_header_f h = {
                .signature = HWDB_SIG,
                .tool_version = htole64(atoi(VERSION)),
                .header_size = htole64(sizeof(struct trie_header_f)),
                .node_size = htole64(sizeof(struct trie_node_f)),
                .child_entry_size = htole64(sizeof(struct trie_child_entry_f)),
                .value_entry_size = htole64(sizeof(struct trie_value_entry_f)),
        };
        int err;

        /* calculate size of header, nodes, children entries, value entries */
        t.strings_off = sizeof(struct trie_header_f);
        trie_store_nodes_size(&t, trie->root);

        err = fopen_temporary(filename , &t.f, &filename_tmp);
        if (err < 0)
                return err;
        fchmod(fileno(t.f), 0444);

        /* write nodes */
        fseeko(t.f, sizeof(struct trie_header_f), SEEK_SET);
        root_off = trie_store_nodes(&t, trie->root);
        h.nodes_root_off = htole64(root_off);
        pos = ftello(t.f);
        h.nodes_len = htole64(pos - sizeof(struct trie_header_f));

        /* write string buffer */
        if (fwrite(trie->strings->buf, trie->strings->len, 1, t.f) != 1)
                log_error("Failed to write into trie->strings->buf in %s\n", "[udevadm-hwdb.c:trie_store]");
        h.strings_len = htole64(trie->strings->len);

        /* write header */
        size = ftello(t.f);
        h.file_size = htole64(size);
        fseeko(t.f, 0, SEEK_SET);
        if (fwrite(&h, sizeof(struct trie_header_f), 1, t.f) != 1)
                log_error("Failed to write into h in %s\n", "[udevadm-hwdb.c:trie_store]");
        err = ferror(t.f);
        if (err)
                err = -errno;
        fclose(t.f);
        if (err < 0 || rename(filename_tmp, filename) < 0) {
                unlink(filename_tmp);
                goto out;
        }

        log_debug("=== trie on-disk ===\n");
        log_debug("size:             %8llu bytes\n", (unsigned long long)size);
        log_debug("header:           %8zu bytes\n", sizeof(struct trie_header_f));
        log_debug("nodes:            %8llu bytes (%8llu)\n",
                  (unsigned long long)t.nodes_count * sizeof(struct trie_node_f), (unsigned long long)t.nodes_count);
        log_debug("child pointers:   %8llu bytes (%8llu)\n",
                  (unsigned long long)t.children_count * sizeof(struct trie_child_entry_f), (unsigned long long)t.children_count);
        log_debug("value pointers:   %8llu bytes (%8llu)\n",
                  (unsigned long long)t.values_count * sizeof(struct trie_value_entry_f), (unsigned long long)t.values_count);
        log_debug("string store:     %8llu bytes\n", (unsigned long long)trie->strings->len);
        log_debug("strings start:    %8llu\n", (unsigned long long) t.strings_off);
out:
        free(filename_tmp);
        return err;
}

static int insert_data(struct trie *trie, struct udev_list *match_list,
                       char *line, const char *filename) {
        char *value;
        struct udev_list_entry *entry;

        value = strchr(line, '=');
        if (!value) {
                log_error("Error, key/value pair expected but got '%s' in '%s':\n", line, filename);
                return -EINVAL;
        }

        value[0] = '\0';
        value++;

        if (line[0] == '\0' || value[0] == '\0') {
                log_error("Error, empty key or value '%s' in '%s':\n", line, filename);
                return -EINVAL;
        }

        udev_list_entry_foreach(entry, udev_list_get_entry(match_list))
                trie_insert(trie, trie->root, udev_list_entry_get_name(entry), line, value);

        return 0;
}

static int import_file(struct udev *udev, struct trie *trie, const char *filename) {
        enum {
                HW_MATCH,
                HW_DATA,
                HW_NONE,
        } state = HW_NONE;
        FILE *f;
        char line[LINE_MAX];
        struct udev_list match_list;

        udev_list_init(udev, &match_list, false);

        f = fopen(filename, "re");
        if (f == NULL)
                return -errno;

        while (fgets(line, sizeof(line), f)) {
                size_t len;
                char *pos;

                /* comment line */
                if (line[0] == '#')
                        continue;

                /* strip trailing comment */
                pos = strchr(line, '#');
                if (pos)
                        pos[0] = '\0';

                /* strip trailing whitespace */
                len = strlen(line);
                while (len > 0 && isspace(line[len-1]))
                        len--;
                line[len] = '\0';

                switch (state) {
                case HW_NONE:
                        if (len == 0)
                                break;

                        if (line[0] == ' ') {
                                log_error("Error, MATCH expected but got '%s' in '%s':\n", line, filename);
                                break;
                        }

                        /* start of record, first match */
                        state = HW_MATCH;
                        udev_list_entry_add(&match_list, line, NULL);
                        break;

                case HW_MATCH:
                        if (len == 0) {
                                log_error("Error, DATA expected but got empty line in '%s':\n", filename);
                                state = HW_NONE;
                                udev_list_cleanup(&match_list);
                                break;
                        }

                        /* another match */
                        if (line[0] != ' ') {
                                udev_list_entry_add(&match_list, line, NULL);
                                break;
                        }

                        /* first data */
                        state = HW_DATA;
                        insert_data(trie, &match_list, line, filename);
                        break;

                case HW_DATA:
                        /* end of record */
                        if (len == 0) {
                                state = HW_NONE;
                                udev_list_cleanup(&match_list);
                                break;
                        }

                        if (line[0] != ' ') {
                                log_error("Error, DATA expected but got '%s' in '%s':\n", line, filename);
                                state = HW_NONE;
                                udev_list_cleanup(&match_list);
                                break;
                        }

                        insert_data(trie, &match_list, line, filename);
                        break;
                };
        }

        fclose(f);
        udev_list_cleanup(&match_list);
        return 0;
}

static void help(void) {
        printf("Usage: udevadm hwdb OPTIONS\n"
               "  --update            update the hardware database\n"
               "  --test=<modalias>   query database and print result\n"
               "  --root=<path>       alternative root path in the filesystem\n"
               "  --help\n\n");
}
예제 #9
0
static int adm_monitor(struct udev *udev, int argc, char *argv[])
{
        struct sigaction act;
        sigset_t mask;
        int option;
        bool prop = false;
        bool print_kernel = false;
        bool print_udev = false;
        struct udev_list subsystem_match_list;
        struct udev_list tag_match_list;
        struct udev_monitor *udev_monitor = NULL;
        struct udev_monitor *kernel_monitor = NULL;
        int fd_ep = -1;
        int fd_kernel = -1, fd_udev = -1;
        struct epoll_event ep_kernel, ep_udev;
        int rc = 0;

        static const struct option options[] = {
                { "property", no_argument, NULL, 'p' },
                { "environment", no_argument, NULL, 'e' },
                { "kernel", no_argument, NULL, 'k' },
                { "udev", no_argument, NULL, 'u' },
                { "subsystem-match", required_argument, NULL, 's' },
                { "tag-match", required_argument, NULL, 't' },
                { "help", no_argument, NULL, 'h' },
                {}
        };

        udev_list_init(udev, &subsystem_match_list, true);
        udev_list_init(udev, &tag_match_list, true);

        for (;;) {
                option = getopt_long(argc, argv, "pekus:t:h", options, NULL);
                if (option == -1)
                        break;

                switch (option) {
                case 'p':
                case 'e':
                        prop = true;
                        break;
                case 'k':
                        print_kernel = true;
                        break;
                case 'u':
                        print_udev = true;
                        break;
                case 's':
                        {
                                char subsys[UTIL_NAME_SIZE];
                                char *devtype;

                                strscpy(subsys, sizeof(subsys), optarg);
                                devtype = strchr(subsys, '/');
                                if (devtype != NULL) {
                                        devtype[0] = '\0';
                                        devtype++;
                                }
                                udev_list_entry_add(&subsystem_match_list, subsys, devtype);
                                break;
                        }
                case 't':
                        udev_list_entry_add(&tag_match_list, optarg, NULL);
                        break;
                case 'h':
                        printf("Usage: udevadm monitor [--property] [--kernel] [--udev] [--help]\n"
                               "  --property                              print the event properties\n"
                               "  --kernel                                print kernel uevents\n"
                               "  --udev                                  print udev events\n"
                               "  --subsystem-match=<subsystem[/devtype]> filter events by subsystem\n"
                               "  --tag-match=<tag>                       filter events by tag\n"
                               "  --help\n\n");
                        goto out;
                default:
                        rc = 1;
                        goto out;
                }
        }

        if (!print_kernel && !print_udev) {
                print_kernel = true;
                print_udev = true;
        }

        /* set signal handlers */
        memset(&act, 0x00, sizeof(struct sigaction));
        act.sa_handler = sig_handler;
        sigemptyset(&act.sa_mask);
        act.sa_flags = SA_RESTART;
        sigaction(SIGINT, &act, NULL);
        sigaction(SIGTERM, &act, NULL);
        sigemptyset(&mask);
        sigaddset(&mask, SIGINT);
        sigaddset(&mask, SIGTERM);
        sigprocmask(SIG_UNBLOCK, &mask, NULL);

        fd_ep = epoll_create1(EPOLL_CLOEXEC);
        if (fd_ep < 0) {
                log_error("error creating epoll fd: %m\n");
                goto out;
        }

        printf("monitor will print the received events for:\n");
        if (print_udev) {
                struct udev_list_entry *entry;

                udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
                if (udev_monitor == NULL) {
                        fprintf(stderr, "error: unable to create netlink socket\n");
                        rc = 1;
                        goto out;
                }
                udev_monitor_set_receive_buffer_size(udev_monitor, 128*1024*1024);
                fd_udev = udev_monitor_get_fd(udev_monitor);

                udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
                        const char *subsys = udev_list_entry_get_name(entry);
                        const char *devtype = udev_list_entry_get_value(entry);

                        if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, subsys, devtype) < 0)
                                fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
                }

                udev_list_entry_foreach(entry, udev_list_get_entry(&tag_match_list)) {
                        const char *tag = udev_list_entry_get_name(entry);

                        if (udev_monitor_filter_add_match_tag(udev_monitor, tag) < 0)
                                fprintf(stderr, "error: unable to apply tag filter '%s'\n", tag);
                }

                if (udev_monitor_enable_receiving(udev_monitor) < 0) {
                        fprintf(stderr, "error: unable to subscribe to udev events\n");
                        rc = 2;
                        goto out;
                }

                memset(&ep_udev, 0, sizeof(struct epoll_event));
                ep_udev.events = EPOLLIN;
                ep_udev.data.fd = fd_udev;
                if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_udev, &ep_udev) < 0) {
                        log_error("fail to add fd to epoll: %m\n");
                        goto out;
                }

                printf("UDEV - the event which udev sends out after rule processing\n");
        }

        if (print_kernel) {
                struct udev_list_entry *entry;

                kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
                if (kernel_monitor == NULL) {
                        fprintf(stderr, "error: unable to create netlink socket\n");
                        rc = 3;
                        goto out;
                }
                udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
                fd_kernel = udev_monitor_get_fd(kernel_monitor);

                udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
                        const char *subsys = udev_list_entry_get_name(entry);

                        if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor, subsys, NULL) < 0)
                                fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
                }

                if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
                        fprintf(stderr, "error: unable to subscribe to kernel events\n");
                        rc = 4;
                        goto out;
                }

                memset(&ep_kernel, 0, sizeof(struct epoll_event));
                ep_kernel.events = EPOLLIN;
                ep_kernel.data.fd = fd_kernel;
                if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_kernel, &ep_kernel) < 0) {
                        log_error("fail to add fd to epoll: %m\n");
                        goto out;
                }

                printf("KERNEL - the kernel uevent\n");
        }
        printf("\n");

        while (!udev_exit) {
                int fdcount;
                struct epoll_event ev[4];
                int i;

                fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
                if (fdcount < 0) {
                        if (errno != EINTR)
                                fprintf(stderr, "error receiving uevent message: %m\n");
                        continue;
                }

                for (i = 0; i < fdcount; i++) {
                        if (ev[i].data.fd == fd_kernel && ev[i].events & EPOLLIN) {
                                struct udev_device *device;

                                device = udev_monitor_receive_device(kernel_monitor);
                                if (device == NULL)
                                        continue;
                                print_device(device, "KERNEL", prop);
                                udev_device_unref(device);
                        } else if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) {
                                struct udev_device *device;

                                device = udev_monitor_receive_device(udev_monitor);
                                if (device == NULL)
                                        continue;
                                print_device(device, "UDEV", prop);
                                udev_device_unref(device);
                        }
                }
        }
out:
        if (fd_ep >= 0)
                close(fd_ep);
        udev_monitor_unref(udev_monitor);
        udev_monitor_unref(kernel_monitor);
        udev_list_cleanup(&subsystem_match_list);
        udev_list_cleanup(&tag_match_list);
        return rc;
}