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-rw-r--r--src/udev/udev-event.c1162
1 files changed, 1162 insertions, 0 deletions
diff --git a/src/udev/udev-event.c b/src/udev/udev-event.c
new file mode 100644
index 0000000..036fe05
--- /dev/null
+++ b/src/udev/udev-event.c
@@ -0,0 +1,1162 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <net/if.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "sd-event.h"
+
+#include "alloc-util.h"
+#include "device-private.h"
+#include "device-util.h"
+#include "fd-util.h"
+#include "fs-util.h"
+#include "format-util.h"
+#include "netif-naming-scheme.h"
+#include "netlink-util.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "process-util.h"
+#include "rlimit-util.h"
+#include "signal-util.h"
+#include "stdio-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "strxcpyx.h"
+#include "udev-builtin.h"
+#include "udev-event.h"
+#include "udev-node.h"
+#include "udev-util.h"
+#include "udev-watch.h"
+#include "user-util.h"
+
+typedef struct Spawn {
+ sd_device *device;
+ const char *cmd;
+ pid_t pid;
+ usec_t timeout_warn_usec;
+ usec_t timeout_usec;
+ int timeout_signal;
+ usec_t event_birth_usec;
+ bool accept_failure;
+ int fd_stdout;
+ int fd_stderr;
+ char *result;
+ size_t result_size;
+ size_t result_len;
+ bool truncated;
+} Spawn;
+
+UdevEvent *udev_event_new(sd_device *dev, usec_t exec_delay_usec, sd_netlink *rtnl, int log_level) {
+ UdevEvent *event;
+
+ assert(dev);
+
+ event = new(UdevEvent, 1);
+ if (!event)
+ return NULL;
+
+ *event = (UdevEvent) {
+ .dev = sd_device_ref(dev),
+ .birth_usec = now(CLOCK_MONOTONIC),
+ .exec_delay_usec = exec_delay_usec,
+ .rtnl = sd_netlink_ref(rtnl),
+ .uid = UID_INVALID,
+ .gid = GID_INVALID,
+ .mode = MODE_INVALID,
+ .log_level_was_debug = log_level == LOG_DEBUG,
+ .default_log_level = log_level,
+ };
+
+ return event;
+}
+
+UdevEvent *udev_event_free(UdevEvent *event) {
+ if (!event)
+ return NULL;
+
+ sd_device_unref(event->dev);
+ sd_device_unref(event->dev_db_clone);
+ sd_netlink_unref(event->rtnl);
+ ordered_hashmap_free_free_key(event->run_list);
+ ordered_hashmap_free_free_free(event->seclabel_list);
+ free(event->program_result);
+ free(event->name);
+
+ return mfree(event);
+}
+
+typedef enum {
+ FORMAT_SUBST_DEVNODE,
+ FORMAT_SUBST_ATTR,
+ FORMAT_SUBST_ENV,
+ FORMAT_SUBST_KERNEL,
+ FORMAT_SUBST_KERNEL_NUMBER,
+ FORMAT_SUBST_DRIVER,
+ FORMAT_SUBST_DEVPATH,
+ FORMAT_SUBST_ID,
+ FORMAT_SUBST_MAJOR,
+ FORMAT_SUBST_MINOR,
+ FORMAT_SUBST_RESULT,
+ FORMAT_SUBST_PARENT,
+ FORMAT_SUBST_NAME,
+ FORMAT_SUBST_LINKS,
+ FORMAT_SUBST_ROOT,
+ FORMAT_SUBST_SYS,
+ _FORMAT_SUBST_TYPE_MAX,
+ _FORMAT_SUBST_TYPE_INVALID = -EINVAL,
+} FormatSubstitutionType;
+
+struct subst_map_entry {
+ const char *name;
+ const char fmt;
+ FormatSubstitutionType type;
+};
+
+static const struct subst_map_entry map[] = {
+ { .name = "devnode", .fmt = 'N', .type = FORMAT_SUBST_DEVNODE },
+ { .name = "tempnode", .fmt = 'N', .type = FORMAT_SUBST_DEVNODE }, /* deprecated */
+ { .name = "attr", .fmt = 's', .type = FORMAT_SUBST_ATTR },
+ { .name = "sysfs", .fmt = 's', .type = FORMAT_SUBST_ATTR }, /* deprecated */
+ { .name = "env", .fmt = 'E', .type = FORMAT_SUBST_ENV },
+ { .name = "kernel", .fmt = 'k', .type = FORMAT_SUBST_KERNEL },
+ { .name = "number", .fmt = 'n', .type = FORMAT_SUBST_KERNEL_NUMBER },
+ { .name = "driver", .fmt = 'd', .type = FORMAT_SUBST_DRIVER },
+ { .name = "devpath", .fmt = 'p', .type = FORMAT_SUBST_DEVPATH },
+ { .name = "id", .fmt = 'b', .type = FORMAT_SUBST_ID },
+ { .name = "major", .fmt = 'M', .type = FORMAT_SUBST_MAJOR },
+ { .name = "minor", .fmt = 'm', .type = FORMAT_SUBST_MINOR },
+ { .name = "result", .fmt = 'c', .type = FORMAT_SUBST_RESULT },
+ { .name = "parent", .fmt = 'P', .type = FORMAT_SUBST_PARENT },
+ { .name = "name", .fmt = 'D', .type = FORMAT_SUBST_NAME },
+ { .name = "links", .fmt = 'L', .type = FORMAT_SUBST_LINKS },
+ { .name = "root", .fmt = 'r', .type = FORMAT_SUBST_ROOT },
+ { .name = "sys", .fmt = 'S', .type = FORMAT_SUBST_SYS },
+};
+
+static const char *format_type_to_string(FormatSubstitutionType t) {
+ for (size_t i = 0; i < ELEMENTSOF(map); i++)
+ if (map[i].type == t)
+ return map[i].name;
+ return NULL;
+}
+
+static char format_type_to_char(FormatSubstitutionType t) {
+ for (size_t i = 0; i < ELEMENTSOF(map); i++)
+ if (map[i].type == t)
+ return map[i].fmt;
+ return '\0';
+}
+
+static int get_subst_type(const char **str, bool strict, FormatSubstitutionType *ret_type, char ret_attr[static UDEV_PATH_SIZE]) {
+ const char *p = *str, *q = NULL;
+ size_t i;
+
+ assert(str);
+ assert(*str);
+ assert(ret_type);
+ assert(ret_attr);
+
+ if (*p == '$') {
+ p++;
+ if (*p == '$') {
+ *str = p;
+ return 0;
+ }
+ for (i = 0; i < ELEMENTSOF(map); i++)
+ if ((q = startswith(p, map[i].name)))
+ break;
+ } else if (*p == '%') {
+ p++;
+ if (*p == '%') {
+ *str = p;
+ return 0;
+ }
+
+ for (i = 0; i < ELEMENTSOF(map); i++)
+ if (*p == map[i].fmt) {
+ q = p + 1;
+ break;
+ }
+ } else
+ return 0;
+ if (!q)
+ /* When 'strict' flag is set, then '$' and '%' must be escaped. */
+ return strict ? -EINVAL : 0;
+
+ if (*q == '{') {
+ const char *start, *end;
+ size_t len;
+
+ start = q + 1;
+ end = strchr(start, '}');
+ if (!end)
+ return -EINVAL;
+
+ len = end - start;
+ if (len == 0 || len >= UDEV_PATH_SIZE)
+ return -EINVAL;
+
+ strnscpy(ret_attr, UDEV_PATH_SIZE, start, len);
+ q = end + 1;
+ } else
+ *ret_attr = '\0';
+
+ *str = q;
+ *ret_type = map[i].type;
+ return 1;
+}
+
+static int safe_atou_optional_plus(const char *s, unsigned *ret) {
+ const char *p;
+ int r;
+
+ assert(s);
+ assert(ret);
+
+ /* Returns 1 if plus, 0 if no plus, negative on error */
+
+ p = endswith(s, "+");
+ if (p)
+ s = strndupa_safe(s, p - s);
+
+ r = safe_atou(s, ret);
+ if (r < 0)
+ return r;
+
+ return !!p;
+}
+
+static ssize_t udev_event_subst_format(
+ UdevEvent *event,
+ FormatSubstitutionType type,
+ const char *attr,
+ char *dest,
+ size_t l,
+ bool *ret_truncated) {
+
+ sd_device *parent, *dev = ASSERT_PTR(ASSERT_PTR(event)->dev);
+ const char *val = NULL;
+ bool truncated = false;
+ char *s = dest;
+ int r;
+
+ switch (type) {
+ case FORMAT_SUBST_DEVPATH:
+ r = sd_device_get_devpath(dev, &val);
+ if (r < 0)
+ return r;
+ strpcpy_full(&s, l, val, &truncated);
+ break;
+ case FORMAT_SUBST_KERNEL:
+ r = sd_device_get_sysname(dev, &val);
+ if (r < 0)
+ return r;
+ strpcpy_full(&s, l, val, &truncated);
+ break;
+ case FORMAT_SUBST_KERNEL_NUMBER:
+ r = sd_device_get_sysnum(dev, &val);
+ if (r == -ENOENT)
+ goto null_terminate;
+ if (r < 0)
+ return r;
+ strpcpy_full(&s, l, val, &truncated);
+ break;
+ case FORMAT_SUBST_ID:
+ if (!event->dev_parent)
+ goto null_terminate;
+ r = sd_device_get_sysname(event->dev_parent, &val);
+ if (r < 0)
+ return r;
+ strpcpy_full(&s, l, val, &truncated);
+ break;
+ case FORMAT_SUBST_DRIVER:
+ if (!event->dev_parent)
+ goto null_terminate;
+ r = sd_device_get_driver(event->dev_parent, &val);
+ if (r == -ENOENT)
+ goto null_terminate;
+ if (r < 0)
+ return r;
+ strpcpy_full(&s, l, val, &truncated);
+ break;
+ case FORMAT_SUBST_MAJOR:
+ case FORMAT_SUBST_MINOR: {
+ dev_t devnum;
+
+ r = sd_device_get_devnum(dev, &devnum);
+ if (r < 0 && r != -ENOENT)
+ return r;
+ strpcpyf_full(&s, l, &truncated, "%u", r < 0 ? 0 : type == FORMAT_SUBST_MAJOR ? major(devnum) : minor(devnum));
+ break;
+ }
+ case FORMAT_SUBST_RESULT: {
+ unsigned index = 0; /* 0 means whole string */
+ bool has_plus;
+
+ if (!event->program_result)
+ goto null_terminate;
+
+ if (!isempty(attr)) {
+ r = safe_atou_optional_plus(attr, &index);
+ if (r < 0)
+ return r;
+
+ has_plus = r;
+ }
+
+ if (index == 0)
+ strpcpy_full(&s, l, event->program_result, &truncated);
+ else {
+ const char *start, *p;
+ unsigned i;
+
+ p = skip_leading_chars(event->program_result, NULL);
+
+ for (i = 1; i < index; i++) {
+ while (*p && !strchr(WHITESPACE, *p))
+ p++;
+ p = skip_leading_chars(p, NULL);
+ if (*p == '\0')
+ break;
+ }
+ if (i != index) {
+ log_device_debug(dev, "requested part of result string not found");
+ goto null_terminate;
+ }
+
+ start = p;
+ /* %c{2+} copies the whole string from the second part on */
+ if (has_plus)
+ strpcpy_full(&s, l, start, &truncated);
+ else {
+ while (*p && !strchr(WHITESPACE, *p))
+ p++;
+ strnpcpy_full(&s, l, start, p - start, &truncated);
+ }
+ }
+ break;
+ }
+ case FORMAT_SUBST_ATTR: {
+ char vbuf[UDEV_NAME_SIZE];
+ int count;
+ bool t;
+
+ if (isempty(attr))
+ return -EINVAL;
+
+ /* try to read the value specified by "[dmi/id]product_name" */
+ if (udev_resolve_subsys_kernel(attr, vbuf, sizeof(vbuf), true) == 0)
+ val = vbuf;
+
+ /* try to read the attribute the device */
+ if (!val)
+ (void) sd_device_get_sysattr_value(dev, attr, &val);
+
+ /* try to read the attribute of the parent device, other matches have selected */
+ if (!val && event->dev_parent && event->dev_parent != dev)
+ (void) sd_device_get_sysattr_value(event->dev_parent, attr, &val);
+
+ if (!val)
+ goto null_terminate;
+
+ /* strip trailing whitespace, and replace unwanted characters */
+ if (val != vbuf)
+ strscpy_full(vbuf, sizeof(vbuf), val, &truncated);
+ delete_trailing_chars(vbuf, NULL);
+ count = udev_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
+ if (count > 0)
+ log_device_debug(dev, "%i character(s) replaced", count);
+ strpcpy_full(&s, l, vbuf, &t);
+ truncated = truncated || t;
+ break;
+ }
+ case FORMAT_SUBST_PARENT:
+ r = sd_device_get_parent(dev, &parent);
+ if (r == -ENOENT)
+ goto null_terminate;
+ if (r < 0)
+ return r;
+ r = sd_device_get_devname(parent, &val);
+ if (r == -ENOENT)
+ goto null_terminate;
+ if (r < 0)
+ return r;
+ strpcpy_full(&s, l, val + STRLEN("/dev/"), &truncated);
+ break;
+ case FORMAT_SUBST_DEVNODE:
+ r = sd_device_get_devname(dev, &val);
+ if (r == -ENOENT)
+ goto null_terminate;
+ if (r < 0)
+ return r;
+ strpcpy_full(&s, l, val, &truncated);
+ break;
+ case FORMAT_SUBST_NAME:
+ if (event->name)
+ strpcpy_full(&s, l, event->name, &truncated);
+ else if (sd_device_get_devname(dev, &val) >= 0)
+ strpcpy_full(&s, l, val + STRLEN("/dev/"), &truncated);
+ else {
+ r = sd_device_get_sysname(dev, &val);
+ if (r < 0)
+ return r;
+ strpcpy_full(&s, l, val, &truncated);
+ }
+ break;
+ case FORMAT_SUBST_LINKS:
+ FOREACH_DEVICE_DEVLINK(dev, val) {
+ if (s == dest)
+ strpcpy_full(&s, l, val + STRLEN("/dev/"), &truncated);
+ else
+ strpcpyl_full(&s, l, &truncated, " ", val + STRLEN("/dev/"), NULL);
+ if (truncated)
+ break;
+ }
+ if (s == dest)
+ goto null_terminate;
+ break;
+ case FORMAT_SUBST_ROOT:
+ strpcpy_full(&s, l, "/dev", &truncated);
+ break;
+ case FORMAT_SUBST_SYS:
+ strpcpy_full(&s, l, "/sys", &truncated);
+ break;
+ case FORMAT_SUBST_ENV:
+ if (isempty(attr))
+ return -EINVAL;
+ r = sd_device_get_property_value(dev, attr, &val);
+ if (r == -ENOENT)
+ goto null_terminate;
+ if (r < 0)
+ return r;
+ strpcpy_full(&s, l, val, &truncated);
+ break;
+ default:
+ assert_not_reached();
+ }
+
+ if (ret_truncated)
+ *ret_truncated = truncated;
+
+ return s - dest;
+
+null_terminate:
+ if (ret_truncated)
+ *ret_truncated = truncated;
+
+ *s = '\0';
+ return 0;
+}
+
+size_t udev_event_apply_format(
+ UdevEvent *event,
+ const char *src,
+ char *dest,
+ size_t size,
+ bool replace_whitespace,
+ bool *ret_truncated) {
+
+ bool truncated = false;
+ const char *s = ASSERT_PTR(src);
+ int r;
+
+ assert(event);
+ assert(event->dev);
+ assert(dest);
+ assert(size > 0);
+
+ while (*s) {
+ FormatSubstitutionType type;
+ char attr[UDEV_PATH_SIZE];
+ ssize_t subst_len;
+ bool t;
+
+ r = get_subst_type(&s, false, &type, attr);
+ if (r < 0) {
+ log_device_warning_errno(event->dev, r, "Invalid format string, ignoring: %s", src);
+ break;
+ } else if (r == 0) {
+ if (size < 2) {
+ /* need space for this char and the terminating NUL */
+ truncated = true;
+ break;
+ }
+ *dest++ = *s++;
+ size--;
+ continue;
+ }
+
+ subst_len = udev_event_subst_format(event, type, attr, dest, size, &t);
+ if (subst_len < 0) {
+ log_device_warning_errno(event->dev, subst_len,
+ "Failed to substitute variable '$%s' or apply format '%%%c', ignoring: %m",
+ format_type_to_string(type), format_type_to_char(type));
+ break;
+ }
+
+ truncated = truncated || t;
+
+ /* FORMAT_SUBST_RESULT handles spaces itself */
+ if (replace_whitespace && type != FORMAT_SUBST_RESULT)
+ /* udev_replace_whitespace can replace in-place,
+ * and does nothing if subst_len == 0 */
+ subst_len = udev_replace_whitespace(dest, dest, subst_len);
+
+ dest += subst_len;
+ size -= subst_len;
+ }
+
+ assert(size >= 1);
+
+ if (ret_truncated)
+ *ret_truncated = truncated;
+
+ *dest = '\0';
+ return size;
+}
+
+int udev_check_format(const char *value, size_t *offset, const char **hint) {
+ FormatSubstitutionType type;
+ const char *s = value;
+ char attr[UDEV_PATH_SIZE];
+ int r;
+
+ while (*s) {
+ r = get_subst_type(&s, true, &type, attr);
+ if (r < 0) {
+ if (offset)
+ *offset = s - value;
+ if (hint)
+ *hint = "invalid substitution type";
+ return r;
+ } else if (r == 0) {
+ s++;
+ continue;
+ }
+
+ if (IN_SET(type, FORMAT_SUBST_ATTR, FORMAT_SUBST_ENV) && isempty(attr)) {
+ if (offset)
+ *offset = s - value;
+ if (hint)
+ *hint = "attribute value missing";
+ return -EINVAL;
+ }
+
+ if (type == FORMAT_SUBST_RESULT && !isempty(attr)) {
+ unsigned i;
+
+ 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 = ASSERT_PTR(userdata);
+ char buf[4096], *p;
+ size_t size;
+ ssize_t l;
+ int r;
+
+ 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 - (p == buf));
+ if (l < 0) {
+ if (errno == EAGAIN)
+ goto reenable;
+
+ log_device_error_errno(spawn->device, errno,
+ "Failed to read stdout of '%s': %m", spawn->cmd);
+
+ return 0;
+ }
+
+ if ((size_t) l == size) {
+ log_device_warning(spawn->device, "Truncating stdout of '%s' up to %zu byte.",
+ spawn->cmd, spawn->result_size);
+ l--;
+ spawn->truncated = true;
+ }
+
+ 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;
+
+ r = strv_split_newlines_full(&v, p, EXTRACT_RETAIN_ESCAPE);
+ if (r < 0)
+ log_device_debug(spawn->device,
+ "Failed to split output from '%s'(%s), ignoring: %m",
+ spawn->cmd, fd == spawn->fd_stdout ? "out" : "err");
+
+ STRV_FOREACH(q, v)
+ log_device_debug(spawn->device, "'%s'(%s) '%s'", spawn->cmd,
+ fd == spawn->fd_stdout ? "out" : "err", *q);
+ }
+
+ if (l == 0 || spawn->truncated)
+ return 0;
+
+reenable:
+ /* Re-enable the event source if we did not encounter EOF */
+
+ r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT);
+ if (r < 0)
+ log_device_error_errno(spawn->device, r,
+ "Failed to reactivate IO source of '%s'", spawn->cmd);
+ return 0;
+}
+
+static int on_spawn_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
+ Spawn *spawn = ASSERT_PTR(userdata);
+
+ DEVICE_TRACE_POINT(spawn_timeout, spawn->device, spawn->cmd);
+
+ kill_and_sigcont(spawn->pid, spawn->timeout_signal);
+
+ log_device_error(spawn->device, "Spawned process '%s' ["PID_FMT"] timed out after %s, killing",
+ spawn->cmd, spawn->pid,
+ FORMAT_TIMESPAN(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 = ASSERT_PTR(userdata);
+
+ log_device_warning(spawn->device, "Spawned process '%s' ["PID_FMT"] is taking longer than %s to complete",
+ spawn->cmd, spawn->pid,
+ FORMAT_TIMESPAN(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 = ASSERT_PTR(userdata);
+ int ret = -EIO;
+
+ 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,
+ "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);
+ }
+
+ DEVICE_TRACE_POINT(spawn_exit, spawn->device, 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;
+ _cleanup_(sd_event_source_disable_unrefp) sd_event_source *sigchld_source = NULL;
+ _cleanup_(sd_event_source_disable_unrefp) sd_event_source *stdout_source = NULL;
+ _cleanup_(sd_event_source_disable_unrefp) sd_event_source *stderr_source = NULL;
+ int r;
+
+ assert(spawn);
+
+ r = sd_event_new(&e);
+ if (r < 0)
+ return log_device_debug_errno(spawn->device, r, "Failed to allocate sd-event object: %m");
+
+ 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 log_device_debug_errno(spawn->device, r, "Failed to create timeout warning event source: %m");
+ }
+
+ 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 log_device_debug_errno(spawn->device, r, "Failed to create timeout event source: %m");
+ }
+ }
+
+ if (spawn->fd_stdout >= 0) {
+ r = sd_event_add_io(e, &stdout_source, spawn->fd_stdout, EPOLLIN, on_spawn_io, spawn);
+ if (r < 0)
+ return log_device_debug_errno(spawn->device, r, "Failed to create stdio event source: %m");
+ r = sd_event_source_set_enabled(stdout_source, SD_EVENT_ONESHOT);
+ if (r < 0)
+ return log_device_debug_errno(spawn->device, r, "Failed to enable stdio event source: %m");
+ }
+
+ if (spawn->fd_stderr >= 0) {
+ r = sd_event_add_io(e, &stderr_source, spawn->fd_stderr, EPOLLIN, on_spawn_io, spawn);
+ if (r < 0)
+ return log_device_debug_errno(spawn->device, r, "Failed to create stderr event source: %m");
+ r = sd_event_source_set_enabled(stderr_source, SD_EVENT_ONESHOT);
+ if (r < 0)
+ return log_device_debug_errno(spawn->device, r, "Failed to enable stderr event source: %m");
+ }
+
+ r = sd_event_add_child(e, &sigchld_source, spawn->pid, WEXITED, on_spawn_sigchld, spawn);
+ if (r < 0)
+ return log_device_debug_errno(spawn->device, r, "Failed to create sigchild event source: %m");
+ /* SIGCHLD should be processed after IO is complete */
+ r = sd_event_source_set_priority(sigchld_source, SD_EVENT_PRIORITY_NORMAL + 1);
+ if (r < 0)
+ return log_device_debug_errno(spawn->device, r, "Failed to set priority to sigchild event source: %m");
+
+ return sd_event_loop(e);
+}
+
+int udev_event_spawn(
+ UdevEvent *event,
+ usec_t timeout_usec,
+ int timeout_signal,
+ bool accept_failure,
+ const char *cmd,
+ char *result,
+ size_t ressize,
+ bool *ret_truncated) {
+
+ _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);
+
+ r = strv_split_full(&argv, cmd, NULL, EXTRACT_UNQUOTE | EXTRACT_RELAX | EXTRACT_RETAIN_ESCAPE);
+ if (r < 0)
+ return log_device_error_errno(event->dev, r, "Failed to split command: %m");
+
+ 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, TAKE_FD(outpipe[WRITE_END]), TAKE_FD(errpipe[WRITE_END])) < 0)
+ _exit(EXIT_FAILURE);
+
+ (void) close_all_fds(NULL, 0);
+ (void) rlimit_nofile_safe();
+
+ DEVICE_TRACE_POINT(spawn_exec, event->dev, cmd);
+
+ 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,
+ .timeout_signal = timeout_signal,
+ .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';
+
+ if (ret_truncated)
+ *ret_truncated = spawn.truncated;
+
+ return r; /* 0 for success, and positive if the program failed */
+}
+
+static int rename_netif(UdevEvent *event) {
+ const char *oldname;
+ sd_device *dev;
+ int ifindex, r;
+
+ assert(event);
+
+ if (!event->name)
+ return 0; /* No new name is requested. */
+
+ dev = ASSERT_PTR(event->dev);
+
+ /* Read sysname from cloned sd-device object, otherwise use-after-free is triggered, as the
+ * main object will be renamed and dev->sysname will be freed in device_rename(). */
+ r = sd_device_get_sysname(event->dev_db_clone, &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, SD_DEVICE_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");
+
+ if (naming_scheme_has(NAMING_REPLACE_STRICTLY) &&
+ !ifname_valid(event->name)) {
+ log_device_warning(dev, "Invalid network interface name, ignoring: %s", event->name);
+ return 0;
+ }
+
+ /* 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);
+
+ /* Also set ID_RENAMING boolean property to cloned sd_device object and save it to database
+ * before calling rtnl_set_link_name(). Otherwise, clients (e.g., systemd-networkd) may receive
+ * RTM_NEWLINK netlink message before the database is updated. */
+ r = device_add_property(event->dev_db_clone, "ID_RENAMING", "1");
+ if (r < 0)
+ return log_device_warning_errno(event->dev_db_clone, r, "Failed to add 'ID_RENAMING' property: %m");
+
+ r = device_update_db(event->dev_db_clone);
+ if (r < 0)
+ return log_device_debug_errno(event->dev_db_clone, r, "Failed to update database under /run/udev/data/: %m");
+
+ r = rtnl_set_link_name(&event->rtnl, ifindex, event->name);
+ if (r == -EBUSY) {
+ log_device_info(dev, "Network interface '%s' is already up, cannot rename to '%s'.",
+ oldname, event->name);
+ return 0;
+ }
+ 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);
+
+ 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 = ASSERT_PTR(ASSERT_PTR(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");
+
+ 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");
+ }
+
+ bool apply_mac = device_for_action(dev, SD_DEVICE_ADD);
+
+ r = udev_node_apply_permissions(dev, apply_mac, event->mode, event->uid, event->gid, event->seclabel_list);
+ if (r < 0)
+ return log_device_error_errno(dev, r, "Failed to apply devnode permissions: %m");
+
+ return udev_node_update(dev, event->dev_db_clone);
+}
+
+static int event_execute_rules_on_remove(
+ UdevEvent *event,
+ int inotify_fd,
+ usec_t timeout_usec,
+ int timeout_signal,
+ Hashmap *properties_list,
+ UdevRules *rules) {
+
+ sd_device *dev = ASSERT_PTR(ASSERT_PTR(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");
+
+ r = udev_watch_end(inotify_fd, dev);
+ if (r < 0)
+ log_device_warning_errno(dev, r, "Failed to remove inotify watch, ignoring: %m");
+
+ r = udev_rules_apply_to_event(rules, event, timeout_usec, timeout_signal, properties_list);
+
+ if (sd_device_get_devnum(dev, NULL) >= 0)
+ (void) udev_node_remove(dev);
+
+ return r;
+}
+
+static int udev_event_on_move(sd_device *dev) {
+ int r;
+
+ /* 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;
+}
+
+static int copy_all_tags(sd_device *d, sd_device *s) {
+ const char *tag;
+ int r;
+
+ assert(d);
+
+ if (!s)
+ return 0;
+
+ FOREACH_DEVICE_TAG(s, tag) {
+ r = device_add_tag(d, tag, false);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+int udev_event_execute_rules(
+ UdevEvent *event,
+ int inotify_fd, /* This may be negative */
+ usec_t timeout_usec,
+ int timeout_signal,
+ Hashmap *properties_list,
+ UdevRules *rules) {
+
+ sd_device_action_t action;
+ sd_device *dev;
+ int r;
+
+ assert(event);
+ assert(rules);
+
+ dev = event->dev;
+
+ r = sd_device_get_action(dev, &action);
+ if (r < 0)
+ return log_device_error_errno(dev, r, "Failed to get ACTION: %m");
+
+ if (action == SD_DEVICE_REMOVE)
+ return event_execute_rules_on_remove(event, inotify_fd, timeout_usec, timeout_signal, properties_list, rules);
+
+ /* Disable watch during event processing. */
+ r = udev_watch_end(inotify_fd, event->dev);
+ if (r < 0)
+ log_device_warning_errno(dev, r, "Failed to remove inotify watch, ignoring: %m");
+
+ 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");
+
+ r = copy_all_tags(dev, event->dev_db_clone);
+ if (r < 0)
+ log_device_warning_errno(dev, r, "Failed to copy all tags from old database entry, ignoring: %m");
+
+ if (action == SD_DEVICE_MOVE) {
+ r = udev_event_on_move(event->dev);
+ if (r < 0)
+ return r;
+ }
+
+ DEVICE_TRACE_POINT(rules_start, dev);
+
+ r = udev_rules_apply_to_event(rules, event, timeout_usec, timeout_signal, properties_list);
+ if (r < 0)
+ return log_device_debug_errno(dev, r, "Failed to apply udev rules: %m");
+
+ DEVICE_TRACE_POINT(rules_finished, dev);
+
+ 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);
+
+ return 0;
+}
+
+void udev_event_execute_run(UdevEvent *event, usec_t timeout_usec, int timeout_signal) {
+ const char *command;
+ void *val;
+ int r;
+
+ ORDERED_HASHMAP_FOREACH_KEY(val, command, event->run_list) {
+ 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, &event->rtnl, 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) {
+ log_device_debug(event->dev, "Delaying execution of \"%s\" for %s.",
+ command, FORMAT_TIMESPAN(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, timeout_signal, false, command, NULL, 0, NULL);
+ if (r < 0)
+ log_device_warning_errno(event->dev, r, "Failed to execute '%s', ignoring: %m", command);
+ else if (r > 0) /* returned value is positive when program fails */
+ log_device_debug(event->dev, "Command \"%s\" returned %d (error), ignoring.", command, r);
+ }
+ }
+}
+
+void udev_event_process_inotify_watch(UdevEvent *event, int inotify_fd) {
+ sd_device *dev;
+ int r;
+
+ assert(event);
+ assert(inotify_fd >= 0);
+
+ dev = ASSERT_PTR(event->dev);
+
+ if (!event->inotify_watch)
+ return;
+
+ if (device_for_action(dev, SD_DEVICE_REMOVE))
+ return;
+
+ r = udev_watch_begin(inotify_fd, dev);
+ if (r < 0) /* The device may be already removed, downgrade log level in that case. */
+ log_device_full_errno(dev, r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
+ "Failed to add inotify watch, ignoring: %m");
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-19 15:43:52 +0000