1022 lines
36 KiB
C
1022 lines
36 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <net/if.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "sd-event.h"
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#include "alloc-util.h"
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#include "device-private.h"
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#include "device-util.h"
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#include "fd-util.h"
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#include "fs-util.h"
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#include "format-util.h"
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#include "libudev-util.h"
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#include "netlink-util.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "process-util.h"
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#include "rlimit-util.h"
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#include "signal-util.h"
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#include "stdio-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "strxcpyx.h"
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#include "udev-builtin.h"
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#include "udev-event.h"
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#include "udev-node.h"
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#include "udev-util.h"
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#include "udev-watch.h"
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#include "user-util.h"
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typedef struct Spawn {
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sd_device *device;
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const char *cmd;
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pid_t pid;
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usec_t timeout_warn_usec;
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usec_t timeout_usec;
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usec_t event_birth_usec;
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bool accept_failure;
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int fd_stdout;
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int fd_stderr;
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char *result;
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size_t result_size;
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size_t result_len;
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} Spawn;
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UdevEvent *udev_event_new(sd_device *dev, usec_t exec_delay_usec, sd_netlink *rtnl) {
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UdevEvent *event;
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assert(dev);
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event = new(UdevEvent, 1);
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if (!event)
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return NULL;
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*event = (UdevEvent) {
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.dev = sd_device_ref(dev),
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.birth_usec = now(CLOCK_MONOTONIC),
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.exec_delay_usec = exec_delay_usec,
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.rtnl = sd_netlink_ref(rtnl),
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.uid = UID_INVALID,
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.gid = GID_INVALID,
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.mode = MODE_INVALID,
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};
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return event;
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}
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UdevEvent *udev_event_free(UdevEvent *event) {
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if (!event)
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return NULL;
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sd_device_unref(event->dev);
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sd_device_unref(event->dev_db_clone);
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sd_netlink_unref(event->rtnl);
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ordered_hashmap_free_free_key(event->run_list);
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ordered_hashmap_free_free_free(event->seclabel_list);
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free(event->program_result);
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free(event->name);
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return mfree(event);
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}
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typedef enum {
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FORMAT_SUBST_DEVNODE,
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FORMAT_SUBST_ATTR,
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FORMAT_SUBST_ENV,
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FORMAT_SUBST_KERNEL,
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FORMAT_SUBST_KERNEL_NUMBER,
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FORMAT_SUBST_DRIVER,
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FORMAT_SUBST_DEVPATH,
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FORMAT_SUBST_ID,
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FORMAT_SUBST_MAJOR,
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FORMAT_SUBST_MINOR,
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FORMAT_SUBST_RESULT,
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FORMAT_SUBST_PARENT,
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FORMAT_SUBST_NAME,
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FORMAT_SUBST_LINKS,
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FORMAT_SUBST_ROOT,
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FORMAT_SUBST_SYS,
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_FORMAT_SUBST_TYPE_MAX,
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_FORMAT_SUBST_TYPE_INVALID = -1
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} FormatSubstitutionType;
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struct subst_map_entry {
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const char *name;
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const char fmt;
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FormatSubstitutionType type;
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};
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static const struct subst_map_entry map[] = {
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{ .name = "devnode", .fmt = 'N', .type = FORMAT_SUBST_DEVNODE },
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{ .name = "tempnode", .fmt = 'N', .type = FORMAT_SUBST_DEVNODE }, /* deprecated */
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{ .name = "attr", .fmt = 's', .type = FORMAT_SUBST_ATTR },
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{ .name = "sysfs", .fmt = 's', .type = FORMAT_SUBST_ATTR }, /* deprecated */
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{ .name = "env", .fmt = 'E', .type = FORMAT_SUBST_ENV },
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{ .name = "kernel", .fmt = 'k', .type = FORMAT_SUBST_KERNEL },
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{ .name = "number", .fmt = 'n', .type = FORMAT_SUBST_KERNEL_NUMBER },
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{ .name = "driver", .fmt = 'd', .type = FORMAT_SUBST_DRIVER },
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{ .name = "devpath", .fmt = 'p', .type = FORMAT_SUBST_DEVPATH },
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{ .name = "id", .fmt = 'b', .type = FORMAT_SUBST_ID },
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{ .name = "major", .fmt = 'M', .type = FORMAT_SUBST_MAJOR },
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{ .name = "minor", .fmt = 'm', .type = FORMAT_SUBST_MINOR },
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{ .name = "result", .fmt = 'c', .type = FORMAT_SUBST_RESULT },
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{ .name = "parent", .fmt = 'P', .type = FORMAT_SUBST_PARENT },
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{ .name = "name", .fmt = 'D', .type = FORMAT_SUBST_NAME },
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{ .name = "links", .fmt = 'L', .type = FORMAT_SUBST_LINKS },
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{ .name = "root", .fmt = 'r', .type = FORMAT_SUBST_ROOT },
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{ .name = "sys", .fmt = 'S', .type = FORMAT_SUBST_SYS },
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};
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static const char *format_type_to_string(FormatSubstitutionType t) {
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for (size_t i = 0; i < ELEMENTSOF(map); i++)
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if (map[i].type == t)
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return map[i].name;
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return NULL;
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}
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static char format_type_to_char(FormatSubstitutionType t) {
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for (size_t i = 0; i < ELEMENTSOF(map); i++)
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if (map[i].type == t)
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return map[i].fmt;
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return '\0';
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}
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static int get_subst_type(const char **str, bool strict, FormatSubstitutionType *ret_type, char ret_attr[static UTIL_PATH_SIZE]) {
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const char *p = *str, *q = NULL;
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size_t i;
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assert(str);
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assert(*str);
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assert(ret_type);
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assert(ret_attr);
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if (*p == '$') {
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p++;
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if (*p == '$') {
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*str = p;
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return 0;
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}
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for (i = 0; i < ELEMENTSOF(map); i++)
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if ((q = startswith(p, map[i].name)))
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break;
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} else if (*p == '%') {
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p++;
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if (*p == '%') {
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*str = p;
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return 0;
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}
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for (i = 0; i < ELEMENTSOF(map); i++)
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if (*p == map[i].fmt) {
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q = p + 1;
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break;
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}
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} else
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return 0;
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if (!q)
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/* When 'strict' flag is set, then '$' and '%' must be escaped. */
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return strict ? -EINVAL : 0;
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if (*q == '{') {
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const char *start, *end;
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size_t len;
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start = q + 1;
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end = strchr(start, '}');
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if (!end)
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return -EINVAL;
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len = end - start;
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if (len == 0 || len >= UTIL_PATH_SIZE)
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return -EINVAL;
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strnscpy(ret_attr, UTIL_PATH_SIZE, start, len);
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q = end + 1;
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} else
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*ret_attr = '\0';
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*str = q;
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*ret_type = map[i].type;
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return 1;
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}
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static int safe_atou_optional_plus(const char *s, unsigned *ret) {
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const char *p;
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int r;
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assert(s);
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assert(ret);
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/* Returns 1 if plus, 0 if no plus, negative on error */
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p = endswith(s, "+");
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if (p)
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s = strndupa(s, p - s);
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r = safe_atou(s, ret);
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if (r < 0)
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return r;
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return !!p;
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}
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static ssize_t udev_event_subst_format(
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UdevEvent *event,
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FormatSubstitutionType type,
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const char *attr,
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char *dest,
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size_t l) {
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sd_device *parent, *dev = event->dev;
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const char *val = NULL;
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char *s = dest;
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int r;
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switch (type) {
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case FORMAT_SUBST_DEVPATH:
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r = sd_device_get_devpath(dev, &val);
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if (r < 0)
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return r;
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l = strpcpy(&s, l, val);
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break;
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case FORMAT_SUBST_KERNEL:
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r = sd_device_get_sysname(dev, &val);
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if (r < 0)
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return r;
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l = strpcpy(&s, l, val);
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break;
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case FORMAT_SUBST_KERNEL_NUMBER:
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r = sd_device_get_sysnum(dev, &val);
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if (r == -ENOENT)
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goto null_terminate;
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if (r < 0)
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return r;
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l = strpcpy(&s, l, val);
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break;
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case FORMAT_SUBST_ID:
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if (!event->dev_parent)
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goto null_terminate;
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r = sd_device_get_sysname(event->dev_parent, &val);
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if (r < 0)
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return r;
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l = strpcpy(&s, l, val);
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break;
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case FORMAT_SUBST_DRIVER:
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if (!event->dev_parent)
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goto null_terminate;
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r = sd_device_get_driver(event->dev_parent, &val);
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if (r == -ENOENT)
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goto null_terminate;
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if (r < 0)
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return r;
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l = strpcpy(&s, l, val);
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break;
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case FORMAT_SUBST_MAJOR:
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case FORMAT_SUBST_MINOR: {
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dev_t devnum;
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r = sd_device_get_devnum(dev, &devnum);
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if (r < 0 && r != -ENOENT)
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return r;
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l = strpcpyf(&s, l, "%u", r < 0 ? 0 : type == FORMAT_SUBST_MAJOR ? major(devnum) : minor(devnum));
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break;
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}
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case FORMAT_SUBST_RESULT: {
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unsigned index = 0; /* 0 means whole string */
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bool has_plus;
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if (!event->program_result)
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goto null_terminate;
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if (!isempty(attr)) {
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r = safe_atou_optional_plus(attr, &index);
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if (r < 0)
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return r;
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has_plus = r;
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}
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if (index == 0)
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l = strpcpy(&s, l, event->program_result);
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else {
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const char *start, *p;
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unsigned i;
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p = skip_leading_chars(event->program_result, NULL);
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for (i = 1; i < index; i++) {
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while (*p && !strchr(WHITESPACE, *p))
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p++;
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p = skip_leading_chars(p, NULL);
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if (*p == '\0')
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break;
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}
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if (i != index) {
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log_device_debug(dev, "requested part of result string not found");
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goto null_terminate;
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}
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start = p;
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/* %c{2+} copies the whole string from the second part on */
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if (has_plus)
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l = strpcpy(&s, l, start);
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else {
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while (*p && !strchr(WHITESPACE, *p))
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p++;
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l = strnpcpy(&s, l, start, p - start);
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}
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}
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break;
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}
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case FORMAT_SUBST_ATTR: {
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char vbuf[UTIL_NAME_SIZE];
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int count;
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if (isempty(attr))
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return -EINVAL;
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/* try to read the value specified by "[dmi/id]product_name" */
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if (util_resolve_subsys_kernel(attr, vbuf, sizeof(vbuf), true) == 0)
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val = vbuf;
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/* try to read the attribute the device */
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if (!val)
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(void) sd_device_get_sysattr_value(dev, attr, &val);
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/* try to read the attribute of the parent device, other matches have selected */
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if (!val && event->dev_parent && event->dev_parent != dev)
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(void) sd_device_get_sysattr_value(event->dev_parent, attr, &val);
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if (!val)
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goto null_terminate;
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/* strip trailing whitespace, and replace unwanted characters */
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if (val != vbuf)
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strscpy(vbuf, sizeof(vbuf), val);
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delete_trailing_chars(vbuf, NULL);
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count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
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if (count > 0)
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log_device_debug(dev, "%i character(s) replaced", count);
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l = strpcpy(&s, l, vbuf);
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break;
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}
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case FORMAT_SUBST_PARENT:
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r = sd_device_get_parent(dev, &parent);
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if (r == -ENODEV)
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goto null_terminate;
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if (r < 0)
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return r;
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r = sd_device_get_devname(parent, &val);
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if (r == -ENOENT)
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goto null_terminate;
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if (r < 0)
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return r;
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l = strpcpy(&s, l, val + STRLEN("/dev/"));
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break;
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case FORMAT_SUBST_DEVNODE:
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r = sd_device_get_devname(dev, &val);
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if (r == -ENOENT)
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goto null_terminate;
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if (r < 0)
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return r;
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l = strpcpy(&s, l, val);
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break;
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case FORMAT_SUBST_NAME:
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if (event->name)
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l = strpcpy(&s, l, event->name);
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else if (sd_device_get_devname(dev, &val) >= 0)
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l = strpcpy(&s, l, val + STRLEN("/dev/"));
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else {
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r = sd_device_get_sysname(dev, &val);
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if (r < 0)
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return r;
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l = strpcpy(&s, l, val);
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}
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break;
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case FORMAT_SUBST_LINKS:
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FOREACH_DEVICE_DEVLINK(dev, val)
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if (s == dest)
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l = strpcpy(&s, l, val + STRLEN("/dev/"));
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else
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l = strpcpyl(&s, l, " ", val + STRLEN("/dev/"), NULL);
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if (s == dest)
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goto null_terminate;
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break;
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case FORMAT_SUBST_ROOT:
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l = strpcpy(&s, l, "/dev");
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break;
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case FORMAT_SUBST_SYS:
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l = strpcpy(&s, l, "/sys");
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break;
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case FORMAT_SUBST_ENV:
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if (isempty(attr))
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return -EINVAL;
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r = sd_device_get_property_value(dev, attr, &val);
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if (r == -ENOENT)
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goto null_terminate;
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if (r < 0)
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return r;
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l = strpcpy(&s, l, val);
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break;
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default:
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assert_not_reached("Unknown format substitution type");
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}
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|
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return s - dest;
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null_terminate:
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*s = '\0';
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return 0;
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}
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ssize_t udev_event_apply_format(UdevEvent *event,
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const char *src, char *dest, size_t size,
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bool replace_whitespace) {
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const char *s = src;
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int r;
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assert(event);
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assert(event->dev);
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assert(src);
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assert(dest);
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assert(size > 0);
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|
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while (*s) {
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FormatSubstitutionType type;
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char attr[UTIL_PATH_SIZE];
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ssize_t subst_len;
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|
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r = get_subst_type(&s, false, &type, attr);
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if (r < 0)
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return log_device_warning_errno(event->dev, r, "Invalid format string, ignoring: %s", src);
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if (r == 0) {
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if (size < 2) /* need space for this char and the terminating NUL */
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break;
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*dest++ = *s++;
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size--;
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continue;
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}
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|
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subst_len = udev_event_subst_format(event, type, attr, dest, size);
|
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if (subst_len < 0)
|
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return log_device_warning_errno(event->dev, subst_len,
|
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"Failed to substitute variable '$%s' or apply format '%%%c', ignoring: %m",
|
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format_type_to_string(type), format_type_to_char(type));
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|
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/* FORMAT_SUBST_RESULT handles spaces itself */
|
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if (replace_whitespace && type != FORMAT_SUBST_RESULT)
|
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/* util_replace_whitespace can replace in-place,
|
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* and does nothing if subst_len == 0 */
|
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subst_len = util_replace_whitespace(dest, dest, subst_len);
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|
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dest += subst_len;
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size -= subst_len;
|
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}
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|
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assert(size >= 1);
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*dest = '\0';
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return size;
|
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}
|
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|
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int udev_check_format(const char *value, size_t *offset, const char **hint) {
|
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FormatSubstitutionType type;
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const char *s = value;
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char attr[UTIL_PATH_SIZE];
|
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int r;
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|
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while (*s) {
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r = get_subst_type(&s, true, &type, attr);
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if (r < 0) {
|
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if (offset)
|
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*offset = s - value;
|
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if (hint)
|
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*hint = "invalid substitution type";
|
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return r;
|
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} else if (r == 0) {
|
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s++;
|
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continue;
|
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}
|
|
|
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if (IN_SET(type, FORMAT_SUBST_ATTR, FORMAT_SUBST_ENV) && isempty(attr)) {
|
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if (offset)
|
|
*offset = s - value;
|
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if (hint)
|
|
*hint = "attribute value missing";
|
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return -EINVAL;
|
|
}
|
|
|
|
if (type == FORMAT_SUBST_RESULT && !isempty(attr)) {
|
|
unsigned i;
|
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|
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r = safe_atou_optional_plus(attr, &i);
|
|
if (r < 0) {
|
|
if (offset)
|
|
*offset = s - value;
|
|
if (hint)
|
|
*hint = "attribute value not a valid number";
|
|
return r;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int on_spawn_io(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
|
|
Spawn *spawn = userdata;
|
|
char buf[4096], *p;
|
|
size_t size;
|
|
ssize_t l;
|
|
|
|
assert(spawn);
|
|
assert(fd == spawn->fd_stdout || fd == spawn->fd_stderr);
|
|
assert(!spawn->result || spawn->result_len < spawn->result_size);
|
|
|
|
if (fd == spawn->fd_stdout && spawn->result) {
|
|
p = spawn->result + spawn->result_len;
|
|
size = spawn->result_size - spawn->result_len;
|
|
} else {
|
|
p = buf;
|
|
size = sizeof(buf);
|
|
}
|
|
|
|
l = read(fd, p, size - 1);
|
|
if (l < 0) {
|
|
if (errno != EAGAIN)
|
|
log_device_error_errno(spawn->device, errno,
|
|
"Failed to read stdout of '%s': %m", spawn->cmd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
p[l] = '\0';
|
|
if (fd == spawn->fd_stdout && spawn->result)
|
|
spawn->result_len += l;
|
|
|
|
/* Log output only if we watch stderr. */
|
|
if (l > 0 && spawn->fd_stderr >= 0) {
|
|
_cleanup_strv_free_ char **v = NULL;
|
|
char **q;
|
|
|
|
v = strv_split_newlines(p);
|
|
if (!v)
|
|
return 0;
|
|
|
|
STRV_FOREACH(q, v)
|
|
log_device_debug(spawn->device, "'%s'(%s) '%s'", spawn->cmd,
|
|
fd == spawn->fd_stdout ? "out" : "err", *q);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int on_spawn_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
|
|
Spawn *spawn = userdata;
|
|
char timeout[FORMAT_TIMESPAN_MAX];
|
|
|
|
assert(spawn);
|
|
|
|
kill_and_sigcont(spawn->pid, SIGKILL);
|
|
|
|
log_device_error(spawn->device, "Spawned process '%s' ["PID_FMT"] timed out after %s, killing",
|
|
spawn->cmd, spawn->pid,
|
|
format_timespan(timeout, sizeof(timeout), spawn->timeout_usec, USEC_PER_SEC));
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int on_spawn_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) {
|
|
Spawn *spawn = userdata;
|
|
char timeout[FORMAT_TIMESPAN_MAX];
|
|
|
|
assert(spawn);
|
|
|
|
log_device_warning(spawn->device, "Spawned process '%s' ["PID_FMT"] is taking longer than %s to complete",
|
|
spawn->cmd, spawn->pid,
|
|
format_timespan(timeout, sizeof(timeout), spawn->timeout_warn_usec, USEC_PER_SEC));
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int on_spawn_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata) {
|
|
Spawn *spawn = userdata;
|
|
int ret = -EIO;
|
|
|
|
assert(spawn);
|
|
|
|
switch (si->si_code) {
|
|
case CLD_EXITED:
|
|
if (si->si_status == 0)
|
|
log_device_debug(spawn->device, "Process '%s' succeeded.", spawn->cmd);
|
|
else
|
|
log_device_full(spawn->device, spawn->accept_failure ? LOG_DEBUG : LOG_WARNING, 0,
|
|
"Process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
|
|
ret = si->si_status;
|
|
break;
|
|
case CLD_KILLED:
|
|
case CLD_DUMPED:
|
|
log_device_error(spawn->device, "Process '%s' terminated by signal %s.", spawn->cmd, signal_to_string(si->si_status));
|
|
break;
|
|
default:
|
|
log_device_error(spawn->device, "Process '%s' failed due to unknown reason.", spawn->cmd);
|
|
}
|
|
|
|
sd_event_exit(sd_event_source_get_event(s), ret);
|
|
return 1;
|
|
}
|
|
|
|
static int spawn_wait(Spawn *spawn) {
|
|
_cleanup_(sd_event_unrefp) sd_event *e = NULL;
|
|
int r;
|
|
|
|
assert(spawn);
|
|
|
|
r = sd_event_new(&e);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (spawn->timeout_usec > 0) {
|
|
usec_t usec, age_usec;
|
|
|
|
usec = now(CLOCK_MONOTONIC);
|
|
age_usec = usec - spawn->event_birth_usec;
|
|
if (age_usec < spawn->timeout_usec) {
|
|
if (spawn->timeout_warn_usec > 0 &&
|
|
spawn->timeout_warn_usec < spawn->timeout_usec &&
|
|
spawn->timeout_warn_usec > age_usec) {
|
|
spawn->timeout_warn_usec -= age_usec;
|
|
|
|
r = sd_event_add_time(e, NULL, CLOCK_MONOTONIC,
|
|
usec + spawn->timeout_warn_usec, USEC_PER_SEC,
|
|
on_spawn_timeout_warning, spawn);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
spawn->timeout_usec -= age_usec;
|
|
|
|
r = sd_event_add_time(e, NULL, CLOCK_MONOTONIC,
|
|
usec + spawn->timeout_usec, USEC_PER_SEC, on_spawn_timeout, spawn);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
if (spawn->fd_stdout >= 0) {
|
|
r = sd_event_add_io(e, NULL, spawn->fd_stdout, EPOLLIN, on_spawn_io, spawn);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
if (spawn->fd_stderr >= 0) {
|
|
r = sd_event_add_io(e, NULL, spawn->fd_stderr, EPOLLIN, on_spawn_io, spawn);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
r = sd_event_add_child(e, NULL, spawn->pid, WEXITED, on_spawn_sigchld, spawn);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return sd_event_loop(e);
|
|
}
|
|
|
|
int udev_event_spawn(UdevEvent *event,
|
|
usec_t timeout_usec,
|
|
bool accept_failure,
|
|
const char *cmd,
|
|
char *result, size_t ressize) {
|
|
_cleanup_close_pair_ int outpipe[2] = {-1, -1}, errpipe[2] = {-1, -1};
|
|
_cleanup_strv_free_ char **argv = NULL;
|
|
char **envp = NULL;
|
|
Spawn spawn;
|
|
pid_t pid;
|
|
int r;
|
|
|
|
assert(event);
|
|
assert(event->dev);
|
|
assert(result || ressize == 0);
|
|
|
|
/* pipes from child to parent */
|
|
if (result || log_get_max_level() >= LOG_INFO)
|
|
if (pipe2(outpipe, O_NONBLOCK|O_CLOEXEC) != 0)
|
|
return log_device_error_errno(event->dev, errno,
|
|
"Failed to create pipe for command '%s': %m", cmd);
|
|
|
|
if (log_get_max_level() >= LOG_INFO)
|
|
if (pipe2(errpipe, O_NONBLOCK|O_CLOEXEC) != 0)
|
|
return log_device_error_errno(event->dev, errno,
|
|
"Failed to create pipe for command '%s': %m", cmd);
|
|
|
|
argv = strv_split_full(cmd, NULL, SPLIT_QUOTES|SPLIT_RELAX);
|
|
if (!argv)
|
|
return log_oom();
|
|
|
|
if (isempty(argv[0]))
|
|
return log_device_error_errno(event->dev, SYNTHETIC_ERRNO(EINVAL),
|
|
"Invalid command '%s'", cmd);
|
|
|
|
/* allow programs in /usr/lib/udev/ to be called without the path */
|
|
if (!path_is_absolute(argv[0])) {
|
|
char *program;
|
|
|
|
program = path_join(UDEVLIBEXECDIR, argv[0]);
|
|
if (!program)
|
|
return log_oom();
|
|
|
|
free_and_replace(argv[0], program);
|
|
}
|
|
|
|
r = device_get_properties_strv(event->dev, &envp);
|
|
if (r < 0)
|
|
return log_device_error_errno(event->dev, r, "Failed to get device properties");
|
|
|
|
log_device_debug(event->dev, "Starting '%s'", cmd);
|
|
|
|
r = safe_fork("(spawn)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid);
|
|
if (r < 0)
|
|
return log_device_error_errno(event->dev, r,
|
|
"Failed to fork() to execute command '%s': %m", cmd);
|
|
if (r == 0) {
|
|
if (rearrange_stdio(-1, outpipe[WRITE_END], errpipe[WRITE_END]) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
(void) close_all_fds(NULL, 0);
|
|
(void) rlimit_nofile_safe();
|
|
|
|
execve(argv[0], argv, envp);
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
/* parent closed child's ends of pipes */
|
|
outpipe[WRITE_END] = safe_close(outpipe[WRITE_END]);
|
|
errpipe[WRITE_END] = safe_close(errpipe[WRITE_END]);
|
|
|
|
spawn = (Spawn) {
|
|
.device = event->dev,
|
|
.cmd = cmd,
|
|
.pid = pid,
|
|
.accept_failure = accept_failure,
|
|
.timeout_warn_usec = udev_warn_timeout(timeout_usec),
|
|
.timeout_usec = timeout_usec,
|
|
.event_birth_usec = event->birth_usec,
|
|
.fd_stdout = outpipe[READ_END],
|
|
.fd_stderr = errpipe[READ_END],
|
|
.result = result,
|
|
.result_size = ressize,
|
|
};
|
|
r = spawn_wait(&spawn);
|
|
if (r < 0)
|
|
return log_device_error_errno(event->dev, r,
|
|
"Failed to wait for spawned command '%s': %m", cmd);
|
|
|
|
if (result)
|
|
result[spawn.result_len] = '\0';
|
|
|
|
return r; /* 0 for success, and positive if the program failed */
|
|
}
|
|
|
|
static int rename_netif(UdevEvent *event) {
|
|
sd_device *dev = event->dev;
|
|
const char *oldname;
|
|
int ifindex, r;
|
|
|
|
if (!event->name)
|
|
return 0; /* No new name is requested. */
|
|
|
|
r = sd_device_get_sysname(dev, &oldname);
|
|
if (r < 0)
|
|
return log_device_error_errno(dev, r, "Failed to get sysname: %m");
|
|
|
|
if (streq(event->name, oldname))
|
|
return 0; /* The interface name is already requested name. */
|
|
|
|
if (!device_for_action(dev, DEVICE_ACTION_ADD))
|
|
return 0; /* Rename the interface only when it is added. */
|
|
|
|
r = sd_device_get_ifindex(dev, &ifindex);
|
|
if (r == -ENOENT)
|
|
return 0; /* Device is not a network interface. */
|
|
if (r < 0)
|
|
return log_device_error_errno(dev, r, "Failed to get ifindex: %m");
|
|
|
|
r = rtnl_set_link_name(&event->rtnl, ifindex, event->name);
|
|
if (r < 0)
|
|
return log_device_error_errno(dev, r, "Failed to rename network interface %i from '%s' to '%s': %m",
|
|
ifindex, oldname, event->name);
|
|
|
|
/* Set ID_RENAMING boolean property here, and drop it in the corresponding move uevent later. */
|
|
r = device_add_property(dev, "ID_RENAMING", "1");
|
|
if (r < 0)
|
|
return log_device_warning_errno(dev, r, "Failed to add 'ID_RENAMING' property: %m");
|
|
|
|
r = device_rename(dev, event->name);
|
|
if (r < 0)
|
|
return log_device_warning_errno(dev, r, "Failed to update properties with new name '%s': %m", event->name);
|
|
|
|
log_device_debug(dev, "Network interface %i is renamed from '%s' to '%s'", ifindex, oldname, event->name);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int update_devnode(UdevEvent *event) {
|
|
sd_device *dev = event->dev;
|
|
int r;
|
|
|
|
r = sd_device_get_devnum(dev, NULL);
|
|
if (r == -ENOENT)
|
|
return 0;
|
|
if (r < 0)
|
|
return log_device_error_errno(dev, r, "Failed to get devnum: %m");
|
|
|
|
/* remove/update possible left-over symlinks from old database entry */
|
|
if (event->dev_db_clone)
|
|
(void) udev_node_update_old_links(dev, event->dev_db_clone);
|
|
|
|
if (!uid_is_valid(event->uid)) {
|
|
r = device_get_devnode_uid(dev, &event->uid);
|
|
if (r < 0 && r != -ENOENT)
|
|
return log_device_error_errno(dev, r, "Failed to get devnode UID: %m");
|
|
}
|
|
|
|
if (!gid_is_valid(event->gid)) {
|
|
r = device_get_devnode_gid(dev, &event->gid);
|
|
if (r < 0 && r != -ENOENT)
|
|
return log_device_error_errno(dev, r, "Failed to get devnode GID: %m");
|
|
}
|
|
|
|
if (event->mode == MODE_INVALID) {
|
|
r = device_get_devnode_mode(dev, &event->mode);
|
|
if (r < 0 && r != -ENOENT)
|
|
return log_device_error_errno(dev, r, "Failed to get devnode mode: %m");
|
|
}
|
|
if (event->mode == MODE_INVALID && gid_is_valid(event->gid) && event->gid > 0)
|
|
/* If group is set, but mode is not set, "upgrade" mode for the group. */
|
|
event->mode = 0660;
|
|
|
|
bool apply_mac = device_for_action(dev, DEVICE_ACTION_ADD);
|
|
|
|
return udev_node_add(dev, apply_mac, event->mode, event->uid, event->gid, event->seclabel_list);
|
|
}
|
|
|
|
static void event_execute_rules_on_remove(
|
|
UdevEvent *event,
|
|
usec_t timeout_usec,
|
|
Hashmap *properties_list,
|
|
UdevRules *rules) {
|
|
|
|
sd_device *dev = event->dev;
|
|
int r;
|
|
|
|
r = device_read_db_internal(dev, true);
|
|
if (r < 0)
|
|
log_device_debug_errno(dev, r, "Failed to read database under /run/udev/data/: %m");
|
|
|
|
r = device_tag_index(dev, NULL, false);
|
|
if (r < 0)
|
|
log_device_debug_errno(dev, r, "Failed to remove corresponding tag files under /run/udev/tag/, ignoring: %m");
|
|
|
|
r = device_delete_db(dev);
|
|
if (r < 0)
|
|
log_device_debug_errno(dev, r, "Failed to delete database under /run/udev/data/, ignoring: %m");
|
|
|
|
if (sd_device_get_devnum(dev, NULL) >= 0)
|
|
(void) udev_watch_end(dev);
|
|
|
|
(void) udev_rules_apply_to_event(rules, event, timeout_usec, properties_list);
|
|
|
|
if (sd_device_get_devnum(dev, NULL) >= 0)
|
|
(void) udev_node_remove(dev);
|
|
}
|
|
|
|
static int udev_event_on_move(UdevEvent *event) {
|
|
sd_device *dev = event->dev;
|
|
int r;
|
|
|
|
if (event->dev_db_clone &&
|
|
sd_device_get_devnum(dev, NULL) < 0) {
|
|
r = device_copy_properties(dev, event->dev_db_clone);
|
|
if (r < 0)
|
|
log_device_debug_errno(dev, r, "Failed to copy properties from cloned sd_device object, ignoring: %m");
|
|
}
|
|
|
|
/* Drop previously added property */
|
|
r = device_add_property(dev, "ID_RENAMING", NULL);
|
|
if (r < 0)
|
|
return log_device_debug_errno(dev, r, "Failed to remove 'ID_RENAMING' property: %m");
|
|
|
|
return 0;
|
|
}
|
|
|
|
int udev_event_execute_rules(UdevEvent *event,
|
|
usec_t timeout_usec,
|
|
Hashmap *properties_list,
|
|
UdevRules *rules) {
|
|
const char *subsystem;
|
|
DeviceAction action;
|
|
sd_device *dev;
|
|
int r;
|
|
|
|
assert(event);
|
|
assert(rules);
|
|
|
|
dev = event->dev;
|
|
|
|
r = sd_device_get_subsystem(dev, &subsystem);
|
|
if (r < 0)
|
|
return log_device_error_errno(dev, r, "Failed to get subsystem: %m");
|
|
|
|
r = device_get_action(dev, &action);
|
|
if (r < 0)
|
|
return log_device_error_errno(dev, r, "Failed to get ACTION: %m");
|
|
|
|
if (action == DEVICE_ACTION_REMOVE) {
|
|
event_execute_rules_on_remove(event, timeout_usec, properties_list, rules);
|
|
return 0;
|
|
}
|
|
|
|
r = device_clone_with_db(dev, &event->dev_db_clone);
|
|
if (r < 0)
|
|
return log_device_debug_errno(dev, r, "Failed to clone sd_device object: %m");
|
|
|
|
if (event->dev_db_clone && sd_device_get_devnum(dev, NULL) >= 0)
|
|
/* Disable watch during event processing. */
|
|
(void) udev_watch_end(event->dev_db_clone);
|
|
|
|
if (action == DEVICE_ACTION_MOVE) {
|
|
r = udev_event_on_move(event);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
r = udev_rules_apply_to_event(rules, event, timeout_usec, properties_list);
|
|
if (r < 0)
|
|
return log_device_debug_errno(dev, r, "Failed to apply udev rules: %m");
|
|
|
|
r = rename_netif(event);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = update_devnode(event);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* preserve old, or get new initialization timestamp */
|
|
r = device_ensure_usec_initialized(dev, event->dev_db_clone);
|
|
if (r < 0)
|
|
return log_device_debug_errno(dev, r, "Failed to set initialization timestamp: %m");
|
|
|
|
/* (re)write database file */
|
|
r = device_tag_index(dev, event->dev_db_clone, true);
|
|
if (r < 0)
|
|
return log_device_debug_errno(dev, r, "Failed to update tags under /run/udev/tag/: %m");
|
|
|
|
r = device_update_db(dev);
|
|
if (r < 0)
|
|
return log_device_debug_errno(dev, r, "Failed to update database under /run/udev/data/: %m");
|
|
|
|
device_set_is_initialized(dev);
|
|
|
|
event->dev_db_clone = sd_device_unref(event->dev_db_clone);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void udev_event_execute_run(UdevEvent *event, usec_t timeout_usec) {
|
|
const char *command;
|
|
void *val;
|
|
Iterator i;
|
|
int r;
|
|
|
|
ORDERED_HASHMAP_FOREACH_KEY(val, command, event->run_list, i) {
|
|
UdevBuiltinCommand builtin_cmd = PTR_TO_UDEV_BUILTIN_CMD(val);
|
|
|
|
if (builtin_cmd != _UDEV_BUILTIN_INVALID) {
|
|
log_device_debug(event->dev, "Running built-in command \"%s\"", command);
|
|
r = udev_builtin_run(event->dev, builtin_cmd, command, false);
|
|
if (r < 0)
|
|
log_device_debug_errno(event->dev, r, "Failed to run built-in command \"%s\", ignoring: %m", command);
|
|
} else {
|
|
if (event->exec_delay_usec > 0) {
|
|
char buf[FORMAT_TIMESPAN_MAX];
|
|
|
|
log_device_debug(event->dev, "Delaying execution of \"%s\" for %s.",
|
|
command, format_timespan(buf, sizeof(buf), event->exec_delay_usec, USEC_PER_SEC));
|
|
(void) usleep(event->exec_delay_usec);
|
|
}
|
|
|
|
log_device_debug(event->dev, "Running command \"%s\"", command);
|
|
r = udev_event_spawn(event, timeout_usec, false, command, NULL, 0);
|
|
if (r > 0) /* returned value is positive when program fails */
|
|
log_device_debug(event->dev, "Command \"%s\" returned %d (error), ignoring.", command, r);
|
|
}
|
|
}
|
|
}
|