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Diffstat (limited to 'src/grp-udev/libudev-core/udev-event.c')
-rw-r--r--src/grp-udev/libudev-core/udev-event.c943
1 files changed, 943 insertions, 0 deletions
diff --git a/src/grp-udev/libudev-core/udev-event.c b/src/grp-udev/libudev-core/udev-event.c
new file mode 100644
index 0000000000..f553b8b73d
--- /dev/null
+++ b/src/grp-udev/libudev-core/udev-event.c
@@ -0,0 +1,943 @@
+/*
+ * Copyright (C) 2003-2013 Kay Sievers <kay@vrfy.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#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 "sd-netlink/netlink-util.h"
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/fd-util.h"
+#include "systemd-basic/formats-util.h"
+#include "systemd-basic/process-util.h"
+#include "systemd-basic/signal-util.h"
+#include "systemd-basic/string-util.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 *udev = udev_device_get_udev(dev);
+ struct udev_event *event;
+
+ event = new0(struct udev_event, 1);
+ if (event == NULL)
+ return NULL;
+ event->dev = dev;
+ event->udev = udev;
+ udev_list_init(udev, &event->run_list, false);
+ udev_list_init(udev, &event->seclabel_list, false);
+ event->birth_usec = clock_boottime_or_monotonic();
+ return event;
+}
+
+void udev_event_unref(struct udev_event *event) {
+ if (event == NULL)
+ return;
+ sd_netlink_unref(event->rtnl);
+ udev_list_cleanup(&event->run_list);
+ udev_list_cleanup(&event->seclabel_list);
+ free(event->program_result);
+ free(event->name);
+ free(event);
+}
+
+size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size) {
+ struct udev_device *dev = event->dev;
+ 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 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;
+
+ while (from[0] != '\0') {
+ if (from[0] == '$') {
+ /* substitute named variable */
+ unsigned int i;
+
+ if (from[1] == '$') {
+ 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 int 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 == 0)
+ goto out;
+ s[0] = from[0];
+ from++;
+ s++;
+ l--;
+ }
+
+ goto out;
+subst:
+ /* extract possible $format{attr} */
+ if (from[0] == '{') {
+ unsigned int 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;
+ }
+
+ 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(event->udev, 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;
+ }
+ }
+
+out:
+ 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 = clock_boottime_or_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_boottime_or_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_boottime_or_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_boottime_or_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_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[]) {
+ int i = 0;
+ char *pos;
+
+ if (strchr(cmd, ' ') == NULL) {
+ argv[i++] = cmd;
+ goto out;
+ }
+
+ pos = cmd;
+ while (pos != NULL && pos[0] != '\0') {
+ if (pos[0] == '\'') {
+ /* do not separate quotes */
+ pos++;
+ argv[i] = strsep(&pos, "\'");
+ if (pos != NULL)
+ while (pos[0] == ' ')
+ pos++;
+ } else {
+ argv[i] = strsep(&pos, " ");
+ if (pos != NULL)
+ while (pos[0] == ' ')
+ pos++;
+ }
+ i++;
+ }
+out:
+ argv[i] = NULL;
+ if (argc)
+ *argc = i;
+ return 0;
+}
+
+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) {
+ int outpipe[2] = {-1, -1};
+ int errpipe[2] = {-1, -1};
+ pid_t pid;
+ int err = 0;
+
+ /* pipes from child to parent */
+ if (result != NULL || log_get_max_level() >= LOG_INFO) {
+ if (pipe2(outpipe, O_NONBLOCK) != 0) {
+ err = log_error_errno(errno, "pipe failed: %m");
+ goto out;
+ }
+ }
+ if (log_get_max_level() >= LOG_INFO) {
+ if (pipe2(errpipe, O_NONBLOCK) != 0) {
+ err = log_error_errno(errno, "pipe failed: %m");
+ goto out;
+ }
+ }
+
+ pid = fork();
+ switch(pid) {
+ case 0:
+ {
+ char arg[UTIL_PATH_SIZE];
+ char *argv[128];
+ char program[UTIL_PATH_SIZE];
+
+ /* child closes parent's ends of pipes */
+ outpipe[READ_END] = safe_close(outpipe[READ_END]);
+ errpipe[READ_END] = safe_close(errpipe[READ_END]);
+
+ strscpy(arg, sizeof(arg), cmd);
+ udev_build_argv(event->udev, arg, NULL, argv);
+
+ /* allow programs in /usr/lib/udev/ to be called without the path */
+ if (argv[0][0] != '/') {
+ strscpyl(program, sizeof(program), UDEVLIBEXECDIR "/", argv[0], NULL);
+ argv[0] = program;
+ }
+
+ 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);
+ }
+ case -1:
+ log_error_errno(errno, "fork of '%s' failed: %m", cmd);
+ err = -1;
+ goto out;
+ default:
+ /* 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);
+
+ err = spawn_wait(event, timeout_usec, timeout_warn_usec, cmd, pid, accept_failure);
+ }
+
+out:
+ if (outpipe[READ_END] >= 0)
+ close(outpipe[READ_END]);
+ if (outpipe[WRITE_END] >= 0)
+ close(outpipe[WRITE_END]);
+ if (errpipe[READ_END] >= 0)
+ close(errpipe[READ_END]);
+ if (errpipe[WRITE_END] >= 0)
+ close(errpipe[WRITE_END]);
+ return err;
+}
+
+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,
+ struct udev_list *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(event->udev, dev);
+
+ 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);
+ } 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->udev, event->dev_db);
+
+ 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, event->dev_db);
+
+ 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, 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) {
+ struct udev_list_entry *list_entry;
+
+ udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
+ char command[UTIL_PATH_SIZE];
+ const char *cmd = udev_list_entry_get_name(list_entry);
+ enum udev_builtin_cmd builtin_cmd = udev_list_entry_get_num(list_entry);
+
+ udev_event_apply_format(event, cmd, command, sizeof(command));
+
+ 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);
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 11:48:13 +0000