| /* 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-internal.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 "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] = PIPE_EBADF, errpipe[2] = PIPE_EBADF; |
| _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|FORK_RLIMIT_NOFILE_SAFE, &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(-EBADF, TAKE_FD(outpipe[WRITE_END]), TAKE_FD(errpipe[WRITE_END])) < 0) |
| _exit(EXIT_FAILURE); |
| |
| (void) close_all_fds(NULL, 0); |
| |
| 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 device_rename(sd_device *device, const char *name) { |
| _cleanup_free_ char *new_syspath = NULL; |
| const char *s; |
| int r; |
| |
| assert(device); |
| assert(name); |
| |
| if (!filename_is_valid(name)) |
| return -EINVAL; |
| |
| r = sd_device_get_syspath(device, &s); |
| if (r < 0) |
| return r; |
| |
| r = path_extract_directory(s, &new_syspath); |
| if (r < 0) |
| return r; |
| |
| if (!path_extend(&new_syspath, name)) |
| return -ENOMEM; |
| |
| if (!path_is_safe(new_syspath)) |
| return -EINVAL; |
| |
| /* At the time this is called, the renamed device may not exist yet. Hence, we cannot validate |
| * the new syspath. */ |
| r = device_set_syspath(device, new_syspath, /* verify = */ false); |
| if (r < 0) |
| return r; |
| |
| r = sd_device_get_property_value(device, "INTERFACE", &s); |
| if (r == -ENOENT) |
| return 0; |
| if (r < 0) |
| return r; |
| |
| /* like DEVPATH_OLD, INTERFACE_OLD is not saved to the db, but only stays around for the current event */ |
| r = device_add_property_internal(device, "INTERFACE_OLD", s); |
| if (r < 0) |
| return r; |
| |
| return device_add_property_internal(device, "INTERFACE", name); |
| } |
| |
| static int rename_netif(UdevEvent *event) { |
| _cleanup_free_ char *old_syspath = NULL, *old_sysname = NULL; |
| const char *s; |
| sd_device *dev; |
| int ifindex, r; |
| |
| assert(event); |
| |
| if (!event->name) |
| return 0; /* No new name is requested. */ |
| |
| dev = ASSERT_PTR(event->dev); |
| |
| 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_warning_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; |
| } |
| |
| r = sd_device_get_sysname(dev, &s); |
| if (r < 0) |
| return log_device_warning_errno(dev, r, "Failed to get sysname: %m"); |
| |
| if (streq(event->name, s)) |
| return 0; /* The interface name is already requested name. */ |
| |
| old_sysname = strdup(s); |
| if (!old_sysname) |
| return -ENOMEM; |
| |
| r = sd_device_get_syspath(dev, &s); |
| if (r < 0) |
| return log_device_warning_errno(dev, r, "Failed to get syspath: %m"); |
| |
| old_syspath = strdup(s); |
| if (!old_syspath) |
| return -ENOMEM; |
| |
| r = device_rename(dev, event->name); |
| if (r < 0) { |
| log_device_warning_errno(dev, r, "Failed to update properties with new name '%s': %m", event->name); |
| goto revert; |
| } |
| |
| /* Set ID_RENAMING boolean property here. It will be dropped when the corresponding move uevent is processed. */ |
| r = device_add_property(dev, "ID_RENAMING", "1"); |
| if (r < 0) { |
| log_device_warning_errno(dev, r, "Failed to add 'ID_RENAMING' property: %m"); |
| goto revert; |
| } |
| |
| /* 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) { |
| log_device_warning_errno(event->dev_db_clone, r, "Failed to add 'ID_RENAMING' property: %m"); |
| goto revert; |
| } |
| |
| r = device_update_db(event->dev_db_clone); |
| if (r < 0) { |
| log_device_debug_errno(event->dev_db_clone, r, "Failed to update database under /run/udev/data/: %m"); |
| goto revert; |
| } |
| |
| r = rtnl_set_link_name(&event->rtnl, ifindex, event->name); |
| if (r < 0) { |
| if (r == -EBUSY) { |
| log_device_info(dev, "Network interface '%s' is already up, cannot rename to '%s'.", |
| old_sysname, event->name); |
| r = 0; |
| } else |
| log_device_error_errno(dev, r, "Failed to rename network interface %i from '%s' to '%s': %m", |
| ifindex, old_sysname, event->name); |
| goto revert; |
| } |
| |
| log_device_debug(dev, "Network interface %i is renamed from '%s' to '%s'", ifindex, old_sysname, event->name); |
| return 1; |
| |
| revert: |
| /* Restore 'dev_db_clone' */ |
| (void) device_add_property(event->dev_db_clone, "ID_RENAMING", NULL); |
| (void) device_update_db(event->dev_db_clone); |
| |
| /* Restore 'dev' */ |
| (void) device_set_syspath(dev, old_syspath, /* verify = */ false); |
| if (sd_device_get_property_value(dev, "INTERFACE_OLD", &s) >= 0) { |
| (void) device_add_property_internal(dev, "INTERFACE", s); |
| (void) device_add_property_internal(dev, "INTERFACE_OLD", NULL); |
| } |
| (void) device_add_property(dev, "ID_RENAMING", NULL); |
| |
| return r; |
| } |
| |
| 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 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; |
| |
| dev = ASSERT_PTR(ASSERT_PTR(event)->dev); |
| assert(rules); |
| |
| 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, 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"); |
| |
| /* Drop previously added property for safety to make IMPORT{db}="ID_RENAMING" not work. This is |
| * mostly for 'move' uevent, but let's do unconditionally. Why? If a network interface is renamed in |
| * initrd, then udevd may lose the 'move' uevent during switching root. Usually, we do not set the |
| * persistent flag for network interfaces, but user may set it. Just for safety. */ |
| r = device_add_property(event->dev_db_clone, "ID_RENAMING", NULL); |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to remove 'ID_RENAMING' property: %m"); |
| |
| 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); |
| } |
| } |
| } |
