915 lines
34 KiB
C
915 lines
34 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <net/if.h>
|
|
#include <poll.h>
|
|
#include <stddef.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/epoll.h>
|
|
#include <sys/prctl.h>
|
|
#include <sys/signalfd.h>
|
|
#include <sys/wait.h>
|
|
#include <unistd.h>
|
|
|
|
#include "alloc-util.h"
|
|
#include "fd-util.h"
|
|
#include "format-util.h"
|
|
#include "libudev-device-internal.h"
|
|
#include "netlink-util.h"
|
|
#include "path-util.h"
|
|
#include "process-util.h"
|
|
#include "signal-util.h"
|
|
#include "string-util.h"
|
|
#include "udev-builtin.h"
|
|
#include "udev-node.h"
|
|
#include "udev-watch.h"
|
|
#include "udev.h"
|
|
|
|
typedef struct Spawn {
|
|
const char *cmd;
|
|
pid_t pid;
|
|
usec_t timeout_warn;
|
|
usec_t timeout;
|
|
bool accept_failure;
|
|
} Spawn;
|
|
|
|
struct udev_event *udev_event_new(struct udev_device *dev) {
|
|
struct udev_event *event;
|
|
|
|
event = new0(struct udev_event, 1);
|
|
if (event == NULL)
|
|
return NULL;
|
|
event->dev = dev;
|
|
event->birth_usec = now(CLOCK_MONOTONIC);
|
|
return event;
|
|
}
|
|
|
|
void udev_event_unref(struct udev_event *event) {
|
|
void *p;
|
|
|
|
if (event == NULL)
|
|
return;
|
|
sd_netlink_unref(event->rtnl);
|
|
while ((p = hashmap_steal_first_key(event->run_list)))
|
|
free(p);
|
|
hashmap_free_free_free(event->seclabel_list);
|
|
free(event->program_result);
|
|
free(event->name);
|
|
free(event);
|
|
}
|
|
|
|
enum subst_type {
|
|
SUBST_UNKNOWN,
|
|
SUBST_DEVNODE,
|
|
SUBST_ATTR,
|
|
SUBST_ENV,
|
|
SUBST_KERNEL,
|
|
SUBST_KERNEL_NUMBER,
|
|
SUBST_DRIVER,
|
|
SUBST_DEVPATH,
|
|
SUBST_ID,
|
|
SUBST_MAJOR,
|
|
SUBST_MINOR,
|
|
SUBST_RESULT,
|
|
SUBST_PARENT,
|
|
SUBST_NAME,
|
|
SUBST_LINKS,
|
|
SUBST_ROOT,
|
|
SUBST_SYS,
|
|
};
|
|
|
|
static size_t subst_format_var(struct udev_event *event, struct udev_device *dev,
|
|
enum subst_type type, char *attr,
|
|
char *dest, size_t l) {
|
|
char *s = dest;
|
|
|
|
switch (type) {
|
|
case SUBST_DEVPATH:
|
|
l = strpcpy(&s, l, udev_device_get_devpath(dev));
|
|
break;
|
|
case SUBST_KERNEL:
|
|
l = strpcpy(&s, l, udev_device_get_sysname(dev));
|
|
break;
|
|
case SUBST_KERNEL_NUMBER:
|
|
if (udev_device_get_sysnum(dev) == NULL)
|
|
break;
|
|
l = strpcpy(&s, l, udev_device_get_sysnum(dev));
|
|
break;
|
|
case SUBST_ID:
|
|
if (event->dev_parent == NULL)
|
|
break;
|
|
l = strpcpy(&s, l, udev_device_get_sysname(event->dev_parent));
|
|
break;
|
|
case SUBST_DRIVER: {
|
|
const char *driver;
|
|
|
|
if (event->dev_parent == NULL)
|
|
break;
|
|
|
|
driver = udev_device_get_driver(event->dev_parent);
|
|
if (driver == NULL)
|
|
break;
|
|
l = strpcpy(&s, l, driver);
|
|
break;
|
|
}
|
|
case SUBST_MAJOR: {
|
|
char num[UTIL_PATH_SIZE];
|
|
|
|
sprintf(num, "%u", major(udev_device_get_devnum(dev)));
|
|
l = strpcpy(&s, l, num);
|
|
break;
|
|
}
|
|
case SUBST_MINOR: {
|
|
char num[UTIL_PATH_SIZE];
|
|
|
|
sprintf(num, "%u", minor(udev_device_get_devnum(dev)));
|
|
l = strpcpy(&s, l, num);
|
|
break;
|
|
}
|
|
case SUBST_RESULT: {
|
|
char *rest;
|
|
int i;
|
|
|
|
if (event->program_result == NULL)
|
|
break;
|
|
/* get part of the result string */
|
|
i = 0;
|
|
if (attr != NULL)
|
|
i = strtoul(attr, &rest, 10);
|
|
if (i > 0) {
|
|
char result[UTIL_PATH_SIZE];
|
|
char tmp[UTIL_PATH_SIZE];
|
|
char *cpos;
|
|
|
|
strscpy(result, sizeof(result), event->program_result);
|
|
cpos = result;
|
|
while (--i) {
|
|
while (cpos[0] != '\0' && !isspace(cpos[0]))
|
|
cpos++;
|
|
while (isspace(cpos[0]))
|
|
cpos++;
|
|
if (cpos[0] == '\0')
|
|
break;
|
|
}
|
|
if (i > 0) {
|
|
log_error("requested part of result string not found");
|
|
break;
|
|
}
|
|
strscpy(tmp, sizeof(tmp), cpos);
|
|
/* %{2+}c copies the whole string from the second part on */
|
|
if (rest[0] != '+') {
|
|
cpos = strchr(tmp, ' ');
|
|
if (cpos)
|
|
cpos[0] = '\0';
|
|
}
|
|
l = strpcpy(&s, l, tmp);
|
|
} else {
|
|
l = strpcpy(&s, l, event->program_result);
|
|
}
|
|
break;
|
|
}
|
|
case SUBST_ATTR: {
|
|
const char *value = NULL;
|
|
char vbuf[UTIL_NAME_SIZE];
|
|
size_t len;
|
|
int count;
|
|
|
|
if (attr == NULL) {
|
|
log_error("missing file parameter for attr");
|
|
break;
|
|
}
|
|
|
|
/* try to read the value specified by "[dmi/id]product_name" */
|
|
if (util_resolve_subsys_kernel(attr, vbuf, sizeof(vbuf), 1) == 0)
|
|
value = vbuf;
|
|
|
|
/* try to read the attribute the device */
|
|
if (value == NULL)
|
|
value = udev_device_get_sysattr_value(event->dev, attr);
|
|
|
|
/* try to read the attribute of the parent device, other matches have selected */
|
|
if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev)
|
|
value = udev_device_get_sysattr_value(event->dev_parent, attr);
|
|
|
|
if (value == NULL)
|
|
break;
|
|
|
|
/* strip trailing whitespace, and replace unwanted characters */
|
|
if (value != vbuf)
|
|
strscpy(vbuf, sizeof(vbuf), value);
|
|
len = strlen(vbuf);
|
|
while (len > 0 && isspace(vbuf[--len]))
|
|
vbuf[len] = '\0';
|
|
count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
|
|
if (count > 0)
|
|
log_debug("%i character(s) replaced" , count);
|
|
l = strpcpy(&s, l, vbuf);
|
|
break;
|
|
}
|
|
case SUBST_PARENT: {
|
|
struct udev_device *dev_parent;
|
|
const char *devnode;
|
|
|
|
dev_parent = udev_device_get_parent(event->dev);
|
|
if (dev_parent == NULL)
|
|
break;
|
|
devnode = udev_device_get_devnode(dev_parent);
|
|
if (devnode != NULL)
|
|
l = strpcpy(&s, l, devnode + STRLEN("/dev/"));
|
|
break;
|
|
}
|
|
case SUBST_DEVNODE:
|
|
if (udev_device_get_devnode(dev) != NULL)
|
|
l = strpcpy(&s, l, udev_device_get_devnode(dev));
|
|
break;
|
|
case SUBST_NAME:
|
|
if (event->name != NULL)
|
|
l = strpcpy(&s, l, event->name);
|
|
else if (udev_device_get_devnode(dev) != NULL)
|
|
l = strpcpy(&s, l,
|
|
udev_device_get_devnode(dev) + STRLEN("/dev/"));
|
|
else
|
|
l = strpcpy(&s, l, udev_device_get_sysname(dev));
|
|
break;
|
|
case SUBST_LINKS: {
|
|
struct udev_list_entry *list_entry;
|
|
|
|
list_entry = udev_device_get_devlinks_list_entry(dev);
|
|
if (list_entry == NULL)
|
|
break;
|
|
l = strpcpy(&s, l,
|
|
udev_list_entry_get_name(list_entry) + STRLEN("/dev/"));
|
|
udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
|
|
l = strpcpyl(&s, l, " ",
|
|
udev_list_entry_get_name(list_entry) + STRLEN("/dev/"),
|
|
NULL);
|
|
break;
|
|
}
|
|
case SUBST_ROOT:
|
|
l = strpcpy(&s, l, "/dev");
|
|
break;
|
|
case SUBST_SYS:
|
|
l = strpcpy(&s, l, "/sys");
|
|
break;
|
|
case SUBST_ENV:
|
|
if (attr == NULL) {
|
|
break;
|
|
} else {
|
|
const char *value;
|
|
|
|
value = udev_device_get_property_value(event->dev, attr);
|
|
if (value == NULL)
|
|
break;
|
|
l = strpcpy(&s, l, value);
|
|
break;
|
|
}
|
|
default:
|
|
log_error("unknown substitution type=%i", type);
|
|
break;
|
|
}
|
|
|
|
return s - dest;
|
|
}
|
|
|
|
size_t udev_event_apply_format(struct udev_event *event,
|
|
const char *src, char *dest, size_t size,
|
|
bool replace_whitespace) {
|
|
struct udev_device *dev = event->dev;
|
|
static const struct subst_map {
|
|
const char *name;
|
|
const char fmt;
|
|
enum subst_type type;
|
|
} map[] = {
|
|
{ .name = "devnode", .fmt = 'N', .type = SUBST_DEVNODE },
|
|
{ .name = "tempnode", .fmt = 'N', .type = SUBST_DEVNODE },
|
|
{ .name = "attr", .fmt = 's', .type = SUBST_ATTR },
|
|
{ .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
|
|
{ .name = "env", .fmt = 'E', .type = SUBST_ENV },
|
|
{ .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
|
|
{ .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
|
|
{ .name = "driver", .fmt = 'd', .type = SUBST_DRIVER },
|
|
{ .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
|
|
{ .name = "id", .fmt = 'b', .type = SUBST_ID },
|
|
{ .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
|
|
{ .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
|
|
{ .name = "result", .fmt = 'c', .type = SUBST_RESULT },
|
|
{ .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
|
|
{ .name = "name", .fmt = 'D', .type = SUBST_NAME },
|
|
{ .name = "links", .fmt = 'L', .type = SUBST_LINKS },
|
|
{ .name = "root", .fmt = 'r', .type = SUBST_ROOT },
|
|
{ .name = "sys", .fmt = 'S', .type = SUBST_SYS },
|
|
};
|
|
const char *from;
|
|
char *s;
|
|
size_t l;
|
|
|
|
assert(dev);
|
|
|
|
from = src;
|
|
s = dest;
|
|
l = size;
|
|
|
|
for (;;) {
|
|
enum subst_type type = SUBST_UNKNOWN;
|
|
char attrbuf[UTIL_PATH_SIZE];
|
|
char *attr = NULL;
|
|
size_t subst_len;
|
|
|
|
while (from[0] != '\0') {
|
|
if (from[0] == '$') {
|
|
/* substitute named variable */
|
|
unsigned i;
|
|
|
|
if (from[1] == '$') {
|
|
from++;
|
|
goto copy;
|
|
}
|
|
|
|
for (i = 0; i < ELEMENTSOF(map); i++) {
|
|
if (startswith(&from[1], map[i].name)) {
|
|
type = map[i].type;
|
|
from += strlen(map[i].name)+1;
|
|
goto subst;
|
|
}
|
|
}
|
|
} else if (from[0] == '%') {
|
|
/* substitute format char */
|
|
unsigned i;
|
|
|
|
if (from[1] == '%') {
|
|
from++;
|
|
goto copy;
|
|
}
|
|
|
|
for (i = 0; i < ELEMENTSOF(map); i++) {
|
|
if (from[1] == map[i].fmt) {
|
|
type = map[i].type;
|
|
from += 2;
|
|
goto subst;
|
|
}
|
|
}
|
|
}
|
|
copy:
|
|
/* copy char */
|
|
if (l < 2) /* need space for this char and the terminating NUL */
|
|
goto out;
|
|
s[0] = from[0];
|
|
from++;
|
|
s++;
|
|
l--;
|
|
}
|
|
|
|
goto out;
|
|
subst:
|
|
/* extract possible $format{attr} */
|
|
if (from[0] == '{') {
|
|
unsigned i;
|
|
|
|
from++;
|
|
for (i = 0; from[i] != '}'; i++)
|
|
if (from[i] == '\0') {
|
|
log_error("missing closing brace for format '%s'", src);
|
|
goto out;
|
|
}
|
|
|
|
if (i >= sizeof(attrbuf))
|
|
goto out;
|
|
memcpy(attrbuf, from, i);
|
|
attrbuf[i] = '\0';
|
|
from += i+1;
|
|
attr = attrbuf;
|
|
} else {
|
|
attr = NULL;
|
|
}
|
|
|
|
subst_len = subst_format_var(event, dev, type, attr, s, l);
|
|
|
|
/* SUBST_RESULT handles spaces itself */
|
|
if (replace_whitespace && type != SUBST_RESULT)
|
|
/* util_replace_whitespace can replace in-place,
|
|
* and does nothing if subst_len == 0
|
|
*/
|
|
subst_len = util_replace_whitespace(s, s, subst_len);
|
|
|
|
s += subst_len;
|
|
l -= subst_len;
|
|
}
|
|
|
|
out:
|
|
assert(l >= 1);
|
|
s[0] = '\0';
|
|
return l;
|
|
}
|
|
|
|
static int spawn_exec(struct udev_event *event,
|
|
const char *cmd, char *const argv[], char **envp,
|
|
int fd_stdout, int fd_stderr) {
|
|
_cleanup_close_ int fd = -1;
|
|
int r;
|
|
|
|
/* discard child output or connect to pipe */
|
|
fd = open("/dev/null", O_RDWR);
|
|
if (fd >= 0) {
|
|
r = dup2(fd, STDIN_FILENO);
|
|
if (r < 0)
|
|
log_warning_errno(errno, "redirecting stdin failed: %m");
|
|
|
|
if (fd_stdout < 0) {
|
|
r = dup2(fd, STDOUT_FILENO);
|
|
if (r < 0)
|
|
log_warning_errno(errno, "redirecting stdout failed: %m");
|
|
}
|
|
|
|
if (fd_stderr < 0) {
|
|
r = dup2(fd, STDERR_FILENO);
|
|
if (r < 0)
|
|
log_warning_errno(errno, "redirecting stderr failed: %m");
|
|
}
|
|
} else
|
|
log_warning_errno(errno, "open /dev/null failed: %m");
|
|
|
|
/* connect pipes to std{out,err} */
|
|
if (fd_stdout >= 0) {
|
|
r = dup2(fd_stdout, STDOUT_FILENO);
|
|
if (r < 0)
|
|
log_warning_errno(errno, "redirecting stdout failed: %m");
|
|
|
|
fd_stdout = safe_close(fd_stdout);
|
|
}
|
|
|
|
if (fd_stderr >= 0) {
|
|
r = dup2(fd_stderr, STDERR_FILENO);
|
|
if (r < 0)
|
|
log_warning_errno(errno, "redirecting stdout failed: %m");
|
|
|
|
fd_stderr = safe_close(fd_stderr);
|
|
}
|
|
|
|
/* terminate child in case parent goes away */
|
|
prctl(PR_SET_PDEATHSIG, SIGTERM);
|
|
|
|
/* restore sigmask before exec */
|
|
(void) reset_signal_mask();
|
|
|
|
execve(argv[0], argv, envp);
|
|
|
|
/* exec failed */
|
|
return log_error_errno(errno, "failed to execute '%s' '%s': %m", argv[0], cmd);
|
|
}
|
|
|
|
static void spawn_read(struct udev_event *event,
|
|
usec_t timeout_usec,
|
|
const char *cmd,
|
|
int fd_stdout, int fd_stderr,
|
|
char *result, size_t ressize) {
|
|
_cleanup_close_ int fd_ep = -1;
|
|
struct epoll_event ep_outpipe = {
|
|
.events = EPOLLIN,
|
|
.data.ptr = &fd_stdout,
|
|
};
|
|
struct epoll_event ep_errpipe = {
|
|
.events = EPOLLIN,
|
|
.data.ptr = &fd_stderr,
|
|
};
|
|
size_t respos = 0;
|
|
int r;
|
|
|
|
/* read from child if requested */
|
|
if (fd_stdout < 0 && fd_stderr < 0)
|
|
return;
|
|
|
|
fd_ep = epoll_create1(EPOLL_CLOEXEC);
|
|
if (fd_ep < 0) {
|
|
log_error_errno(errno, "error creating epoll fd: %m");
|
|
return;
|
|
}
|
|
|
|
if (fd_stdout >= 0) {
|
|
r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe);
|
|
if (r < 0) {
|
|
log_error_errno(errno, "fail to add stdout fd to epoll: %m");
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (fd_stderr >= 0) {
|
|
r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe);
|
|
if (r < 0) {
|
|
log_error_errno(errno, "fail to add stderr fd to epoll: %m");
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* read child output */
|
|
while (fd_stdout >= 0 || fd_stderr >= 0) {
|
|
int timeout;
|
|
int fdcount;
|
|
struct epoll_event ev[4];
|
|
int i;
|
|
|
|
if (timeout_usec > 0) {
|
|
usec_t age_usec;
|
|
|
|
age_usec = now(CLOCK_MONOTONIC) - event->birth_usec;
|
|
if (age_usec >= timeout_usec) {
|
|
log_error("timeout '%s'", cmd);
|
|
return;
|
|
}
|
|
timeout = ((timeout_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
|
|
} else {
|
|
timeout = -1;
|
|
}
|
|
|
|
fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
|
|
if (fdcount < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
log_error_errno(errno, "failed to poll: %m");
|
|
return;
|
|
} else if (fdcount == 0) {
|
|
log_error("timeout '%s'", cmd);
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < fdcount; i++) {
|
|
int *fd = (int *)ev[i].data.ptr;
|
|
|
|
if (*fd < 0)
|
|
continue;
|
|
|
|
if (ev[i].events & EPOLLIN) {
|
|
ssize_t count;
|
|
char buf[4096];
|
|
|
|
count = read(*fd, buf, sizeof(buf)-1);
|
|
if (count <= 0)
|
|
continue;
|
|
buf[count] = '\0';
|
|
|
|
/* store stdout result */
|
|
if (result != NULL && *fd == fd_stdout) {
|
|
if (respos + count < ressize) {
|
|
memcpy(&result[respos], buf, count);
|
|
respos += count;
|
|
} else {
|
|
log_error("'%s' ressize %zu too short", cmd, ressize);
|
|
}
|
|
}
|
|
|
|
/* log debug output only if we watch stderr */
|
|
if (fd_stderr >= 0) {
|
|
char *pos;
|
|
char *line;
|
|
|
|
pos = buf;
|
|
while ((line = strsep(&pos, "\n"))) {
|
|
if (pos != NULL || line[0] != '\0')
|
|
log_debug("'%s'(%s) '%s'", cmd, *fd == fd_stdout ? "out" : "err" , line);
|
|
}
|
|
}
|
|
} else if (ev[i].events & EPOLLHUP) {
|
|
r = epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL);
|
|
if (r < 0) {
|
|
log_error_errno(errno, "failed to remove fd from epoll: %m");
|
|
return;
|
|
}
|
|
*fd = -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* return the child's stdout string */
|
|
if (result != NULL)
|
|
result[respos] = '\0';
|
|
}
|
|
|
|
static int on_spawn_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
|
|
Spawn *spawn = userdata;
|
|
char timeout[FORMAT_TIMESTAMP_RELATIVE_MAX];
|
|
|
|
assert(spawn);
|
|
|
|
kill_and_sigcont(spawn->pid, SIGKILL);
|
|
|
|
log_error("spawned process '%s' ["PID_FMT"] timed out after %s, killing", spawn->cmd, spawn->pid,
|
|
format_timestamp_relative(timeout, sizeof(timeout), spawn->timeout));
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int on_spawn_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) {
|
|
Spawn *spawn = userdata;
|
|
char timeout[FORMAT_TIMESTAMP_RELATIVE_MAX];
|
|
|
|
assert(spawn);
|
|
|
|
log_warning("spawned process '%s' ["PID_FMT"] is taking longer than %s to complete", spawn->cmd, spawn->pid,
|
|
format_timestamp_relative(timeout, sizeof(timeout), spawn->timeout));
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int on_spawn_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata) {
|
|
Spawn *spawn = userdata;
|
|
|
|
assert(spawn);
|
|
|
|
switch (si->si_code) {
|
|
case CLD_EXITED:
|
|
if (si->si_status == 0) {
|
|
log_debug("Process '%s' succeeded.", spawn->cmd);
|
|
sd_event_exit(sd_event_source_get_event(s), 0);
|
|
|
|
return 1;
|
|
} else if (spawn->accept_failure)
|
|
log_debug("Process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
|
|
else
|
|
log_warning("Process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
|
|
|
|
break;
|
|
case CLD_KILLED:
|
|
case CLD_DUMPED:
|
|
log_warning("Process '%s' terminated by signal %s.", spawn->cmd, signal_to_string(si->si_status));
|
|
|
|
break;
|
|
default:
|
|
log_error("Process '%s' failed due to unknown reason.", spawn->cmd);
|
|
}
|
|
|
|
sd_event_exit(sd_event_source_get_event(s), -EIO);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int spawn_wait(struct udev_event *event,
|
|
usec_t timeout_usec,
|
|
usec_t timeout_warn_usec,
|
|
const char *cmd, pid_t pid,
|
|
bool accept_failure) {
|
|
Spawn spawn = {
|
|
.cmd = cmd,
|
|
.pid = pid,
|
|
.accept_failure = accept_failure,
|
|
};
|
|
_cleanup_(sd_event_unrefp) sd_event *e = NULL;
|
|
int r, ret;
|
|
|
|
r = sd_event_new(&e);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (timeout_usec > 0) {
|
|
usec_t usec, age_usec;
|
|
|
|
usec = now(CLOCK_MONOTONIC);
|
|
age_usec = usec - event->birth_usec;
|
|
if (age_usec < timeout_usec) {
|
|
if (timeout_warn_usec > 0 && timeout_warn_usec < timeout_usec && age_usec < timeout_warn_usec) {
|
|
spawn.timeout_warn = timeout_warn_usec - age_usec;
|
|
|
|
r = sd_event_add_time(e, NULL, CLOCK_MONOTONIC,
|
|
usec + spawn.timeout_warn, USEC_PER_SEC,
|
|
on_spawn_timeout_warning, &spawn);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
spawn.timeout = timeout_usec - age_usec;
|
|
|
|
r = sd_event_add_time(e, NULL, CLOCK_MONOTONIC,
|
|
usec + spawn.timeout, USEC_PER_SEC, on_spawn_timeout, &spawn);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
r = sd_event_add_child(e, NULL, pid, WEXITED, on_spawn_sigchld, &spawn);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_event_loop(e);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_event_get_exit_code(e, &ret);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int udev_event_spawn(struct udev_event *event,
|
|
usec_t timeout_usec,
|
|
usec_t timeout_warn_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;
|
|
pid_t pid;
|
|
int r;
|
|
|
|
/* pipes from child to parent */
|
|
if (!result || log_get_max_level() >= LOG_INFO)
|
|
if (pipe2(outpipe, O_NONBLOCK) != 0)
|
|
return log_error_errno(errno, "Failed to create pipe for command '%s': %m", cmd);
|
|
|
|
if (log_get_max_level() >= LOG_INFO)
|
|
if (pipe2(errpipe, O_NONBLOCK) != 0)
|
|
return log_error_errno(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();
|
|
|
|
/* allow programs in /usr/lib/udev/ to be called without the path */
|
|
if (!path_is_absolute(argv[0])) {
|
|
char *program;
|
|
|
|
program = path_join(NULL, UDEVLIBEXECDIR, argv[0]);
|
|
if (!program)
|
|
return log_oom();
|
|
|
|
free_and_replace(argv[0], program);
|
|
}
|
|
|
|
r = safe_fork("(spawn)", FORK_RESET_SIGNALS|FORK_LOG, &pid);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to fork() to execute command '%s': %m", cmd);
|
|
if (r == 0) {
|
|
/* child closes parent's ends of pipes */
|
|
outpipe[READ_END] = safe_close(outpipe[READ_END]);
|
|
errpipe[READ_END] = safe_close(errpipe[READ_END]);
|
|
|
|
log_debug("Starting '%s'", cmd);
|
|
|
|
spawn_exec(event, cmd, argv, udev_device_get_properties_envp(event->dev),
|
|
outpipe[WRITE_END], errpipe[WRITE_END]);
|
|
|
|
_exit(2);
|
|
}
|
|
|
|
/* parent closed child's ends of pipes */
|
|
outpipe[WRITE_END] = safe_close(outpipe[WRITE_END]);
|
|
errpipe[WRITE_END] = safe_close(errpipe[WRITE_END]);
|
|
|
|
spawn_read(event,
|
|
timeout_usec,
|
|
cmd,
|
|
outpipe[READ_END], errpipe[READ_END],
|
|
result, ressize);
|
|
|
|
r = spawn_wait(event, timeout_usec, timeout_warn_usec, cmd, pid, accept_failure);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to wait spawned command '%s': %m", cmd);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int rename_netif(struct udev_event *event) {
|
|
struct udev_device *dev = event->dev;
|
|
char name[IFNAMSIZ];
|
|
const char *oldname;
|
|
int r;
|
|
|
|
oldname = udev_device_get_sysname(dev);
|
|
|
|
strscpy(name, IFNAMSIZ, event->name);
|
|
|
|
r = rtnl_set_link_name(&event->rtnl, udev_device_get_ifindex(dev), name);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Error changing net interface name '%s' to '%s': %m", oldname, name);
|
|
|
|
log_debug("renamed network interface '%s' to '%s'", oldname, name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void udev_event_execute_rules(struct udev_event *event,
|
|
usec_t timeout_usec, usec_t timeout_warn_usec,
|
|
Hashmap *properties_list,
|
|
struct udev_rules *rules) {
|
|
struct udev_device *dev = event->dev;
|
|
|
|
if (udev_device_get_subsystem(dev) == NULL)
|
|
return;
|
|
|
|
if (streq(udev_device_get_action(dev), "remove")) {
|
|
udev_device_read_db(dev);
|
|
udev_device_tag_index(dev, NULL, false);
|
|
udev_device_delete_db(dev);
|
|
|
|
if (major(udev_device_get_devnum(dev)) != 0)
|
|
udev_watch_end(dev->device);
|
|
|
|
udev_rules_apply_to_event(rules, event,
|
|
timeout_usec, timeout_warn_usec,
|
|
properties_list);
|
|
|
|
if (major(udev_device_get_devnum(dev)) != 0)
|
|
udev_node_remove(dev->device);
|
|
} else {
|
|
event->dev_db = udev_device_clone_with_db(dev);
|
|
if (event->dev_db != NULL) {
|
|
/* disable watch during event processing */
|
|
if (major(udev_device_get_devnum(dev)) != 0)
|
|
udev_watch_end(event->dev_db->device);
|
|
|
|
if (major(udev_device_get_devnum(dev)) == 0 &&
|
|
streq(udev_device_get_action(dev), "move"))
|
|
udev_device_copy_properties(dev, event->dev_db);
|
|
}
|
|
|
|
udev_rules_apply_to_event(rules, event,
|
|
timeout_usec, timeout_warn_usec,
|
|
properties_list);
|
|
|
|
/* rename a new network interface, if needed */
|
|
if (udev_device_get_ifindex(dev) > 0 && streq(udev_device_get_action(dev), "add") &&
|
|
event->name != NULL && !streq(event->name, udev_device_get_sysname(dev))) {
|
|
int r;
|
|
|
|
r = rename_netif(event);
|
|
if (r < 0)
|
|
log_warning_errno(r, "could not rename interface '%d' from '%s' to '%s': %m", udev_device_get_ifindex(dev),
|
|
udev_device_get_sysname(dev), event->name);
|
|
else {
|
|
r = udev_device_rename(dev, event->name);
|
|
if (r < 0)
|
|
log_warning_errno(r, "renamed interface '%d' from '%s' to '%s', but could not update udev_device: %m",
|
|
udev_device_get_ifindex(dev), udev_device_get_sysname(dev), event->name);
|
|
else
|
|
log_debug("changed devpath to '%s'", udev_device_get_devpath(dev));
|
|
}
|
|
}
|
|
|
|
if (major(udev_device_get_devnum(dev)) > 0) {
|
|
bool apply;
|
|
|
|
/* remove/update possible left-over symlinks from old database entry */
|
|
if (event->dev_db != NULL)
|
|
udev_node_update_old_links(dev->device, event->dev_db->device);
|
|
|
|
if (!event->owner_set)
|
|
event->uid = udev_device_get_devnode_uid(dev);
|
|
|
|
if (!event->group_set)
|
|
event->gid = udev_device_get_devnode_gid(dev);
|
|
|
|
if (!event->mode_set) {
|
|
if (udev_device_get_devnode_mode(dev) > 0) {
|
|
/* kernel supplied value */
|
|
event->mode = udev_device_get_devnode_mode(dev);
|
|
} else if (event->gid > 0) {
|
|
/* default 0660 if a group is assigned */
|
|
event->mode = 0660;
|
|
} else {
|
|
/* default 0600 */
|
|
event->mode = 0600;
|
|
}
|
|
}
|
|
|
|
apply = streq(udev_device_get_action(dev), "add") || event->owner_set || event->group_set || event->mode_set;
|
|
udev_node_add(dev->device, apply, event->mode, event->uid, event->gid, event->seclabel_list);
|
|
}
|
|
|
|
/* preserve old, or get new initialization timestamp */
|
|
udev_device_ensure_usec_initialized(event->dev, event->dev_db);
|
|
|
|
/* (re)write database file */
|
|
udev_device_tag_index(dev, event->dev_db, true);
|
|
udev_device_update_db(dev);
|
|
udev_device_set_is_initialized(dev);
|
|
|
|
event->dev_db = udev_device_unref(event->dev_db);
|
|
}
|
|
}
|
|
|
|
void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, usec_t timeout_warn_usec) {
|
|
const char *cmd;
|
|
void *val;
|
|
Iterator i;
|
|
|
|
HASHMAP_FOREACH_KEY(val, cmd, event->run_list, i) {
|
|
enum udev_builtin_cmd builtin_cmd = PTR_TO_INT(val);
|
|
char command[UTIL_PATH_SIZE];
|
|
|
|
udev_event_apply_format(event, cmd, command, sizeof(command), false);
|
|
|
|
if (builtin_cmd < UDEV_BUILTIN_MAX)
|
|
udev_builtin_run(event->dev, builtin_cmd, command, false);
|
|
else {
|
|
if (event->exec_delay > 0) {
|
|
log_debug("delay execution of '%s'", command);
|
|
sleep(event->exec_delay);
|
|
}
|
|
|
|
udev_event_spawn(event, timeout_usec, timeout_warn_usec, false, command, NULL, 0);
|
|
}
|
|
}
|
|
}
|