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-rw-r--r--src/udev/udev-event.c1011
1 files changed, 1011 insertions, 0 deletions
diff --git a/src/udev/udev-event.c b/src/udev/udev-event.c
new file mode 100644
index 0000000000..40a6b7d33e
--- /dev/null
+++ b/src/udev/udev-event.c
@@ -0,0 +1,1011 @@
+/*
+ * Copyright (C) 2003-2010 Kay Sievers <kay.sievers@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 <stdlib.h>
+#include <stdio.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <ctype.h>
+#include <string.h>
+#include <time.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <sys/prctl.h>
+#include <sys/poll.h>
+#include <sys/epoll.h>
+#include <sys/wait.h>
+#include <sys/socket.h>
+#include <sys/signalfd.h>
+#include <linux/sockios.h>
+
+#include "udev.h"
+
+struct udev_event *udev_event_new(struct udev_device *dev)
+{
+ struct udev *udev = udev_device_get_udev(dev);
+ struct udev_event *event;
+
+ event = calloc(1, sizeof(struct udev_event));
+ if (event == NULL)
+ return NULL;
+ event->dev = dev;
+ event->udev = udev;
+ udev_list_init(udev, &event->run_list, false);
+ event->fd_signal = -1;
+ event->birth_usec = now_usec();
+ event->timeout_usec = 30 * 1000 * 1000;
+ dbg(event->udev, "allocated event %p\n", event);
+ return event;
+}
+
+void udev_event_unref(struct udev_event *event)
+{
+ if (event == NULL)
+ return;
+ udev_list_cleanup(&event->run_list);
+ free(event->program_result);
+ free(event->name);
+ dbg(event->udev, "free event %p\n", event);
+ 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 {
+ char *name;
+ 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;
+
+ 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 < ARRAY_SIZE(map); i++) {
+ if (strncmp(&from[1], map[i].name, strlen(map[i].name)) == 0) {
+ type = map[i].type;
+ from += strlen(map[i].name)+1;
+ dbg(event->udev, "will substitute format name '%s'\n", map[i].name);
+ goto subst;
+ }
+ }
+ } else if (from[0] == '%') {
+ /* substitute format char */
+ unsigned int i;
+
+ if (from[1] == '%') {
+ from++;
+ goto copy;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(map); i++) {
+ if (from[1] == map[i].fmt) {
+ type = map[i].type;
+ from += 2;
+ dbg(event->udev, "will substitute format char '%c'\n", map[i].fmt);
+ 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') {
+ err(event->udev, "missing closing brace for format '%s'\n", 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 = util_strpcpy(&s, l, udev_device_get_devpath(dev));
+ dbg(event->udev, "substitute devpath '%s'\n", udev_device_get_devpath(dev));
+ break;
+ case SUBST_KERNEL:
+ l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
+ dbg(event->udev, "substitute kernel name '%s'\n", udev_device_get_sysname(dev));
+ break;
+ case SUBST_KERNEL_NUMBER:
+ if (udev_device_get_sysnum(dev) == NULL)
+ break;
+ l = util_strpcpy(&s, l, udev_device_get_sysnum(dev));
+ dbg(event->udev, "substitute kernel number '%s'\n", udev_device_get_sysnum(dev));
+ break;
+ case SUBST_ID:
+ if (event->dev_parent == NULL)
+ break;
+ l = util_strpcpy(&s, l, udev_device_get_sysname(event->dev_parent));
+ dbg(event->udev, "substitute id '%s'\n", 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 = util_strpcpy(&s, l, driver);
+ dbg(event->udev, "substitute driver '%s'\n", driver);
+ break;
+ }
+ case SUBST_MAJOR: {
+ char num[UTIL_PATH_SIZE];
+
+ sprintf(num, "%d", major(udev_device_get_devnum(dev)));
+ l = util_strpcpy(&s, l, num);
+ dbg(event->udev, "substitute major number '%s'\n", num);
+ break;
+ }
+ case SUBST_MINOR: {
+ char num[UTIL_PATH_SIZE];
+
+ sprintf(num, "%d", minor(udev_device_get_devnum(dev)));
+ l = util_strpcpy(&s, l, num);
+ dbg(event->udev, "substitute minor number '%s'\n", num);
+ break;
+ }
+ case SUBST_RESULT: {
+ char *rest;
+ int i;
+
+ if (event->program_result == NULL)
+ break;
+ /* get part 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;
+
+ dbg(event->udev, "request part #%d of result string\n", i);
+ util_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 (i > 0) {
+ err(event->udev, "requested part of result string not found\n");
+ break;
+ }
+ util_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 = util_strpcpy(&s, l, tmp);
+ dbg(event->udev, "substitute part of result string '%s'\n", tmp);
+ } else {
+ l = util_strpcpy(&s, l, event->program_result);
+ dbg(event->udev, "substitute result string '%s'\n", event->program_result);
+ }
+ break;
+ }
+ case SUBST_ATTR: {
+ const char *value = NULL;
+ char vbuf[UTIL_NAME_SIZE];
+ size_t len;
+ int count;
+
+ if (attr == NULL) {
+ err(event->udev, "missing file parameter for attr\n");
+ 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)
+ util_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)
+ info(event->udev, "%i character(s) replaced\n" , count);
+ l = util_strpcpy(&s, l, vbuf);
+ dbg(event->udev, "substitute sysfs value '%s'\n", 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) {
+ size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
+
+ l = util_strpcpy(&s, l, &devnode[devlen]);
+ dbg(event->udev, "found parent '%s', got node name '%s'\n",
+ udev_device_get_syspath(dev_parent), &devnode[devlen]);
+ }
+ break;
+ }
+ case SUBST_DEVNODE:
+ if (udev_device_get_devnode(dev) != NULL)
+ l = util_strpcpy(&s, l, udev_device_get_devnode(dev));
+ break;
+ case SUBST_NAME: {
+ if (event->name != NULL) {
+ l = util_strpcpy(&s, l, event->name);
+ dbg(event->udev, "substitute custom node name '%s'\n", event->name);
+ } else if (udev_device_get_devnode(dev) != NULL) {
+ size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
+
+ l = util_strpcpy(&s, l, &udev_device_get_devnode(dev)[devlen]);
+ dbg(event->udev, "substitute node name'%s'\n", &udev_device_get_devnode(dev)[devlen]);
+ } else {
+ l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
+ dbg(event->udev, "substitute device name'%s'\n", udev_device_get_sysname(dev));
+ }
+ break;
+ }
+ case SUBST_LINKS: {
+ size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
+ struct udev_list_entry *list_entry;
+
+ list_entry = udev_device_get_devlinks_list_entry(dev);
+ if (list_entry == NULL)
+ break;
+ l = util_strpcpy(&s, l, &udev_list_entry_get_name(list_entry)[devlen]);
+ udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
+ l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL);
+ break;
+ }
+ case SUBST_ROOT:
+ l = util_strpcpy(&s, l, udev_get_dev_path(event->udev));
+ dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
+ break;
+ case SUBST_SYS:
+ l = util_strpcpy(&s, l, udev_get_sys_path(event->udev));
+ dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
+ break;
+ case SUBST_ENV:
+ if (attr == NULL) {
+ dbg(event->udev, "missing attribute\n");
+ break;
+ } else {
+ const char *value;
+
+ value = udev_device_get_property_value(event->dev, attr);
+ if (value == NULL)
+ break;
+ dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
+ l = util_strpcpy(&s, l, value);
+ break;
+ }
+ default:
+ err(event->udev, "unknown substitution type=%i\n", type);
+ break;
+ }
+ }
+
+out:
+ s[0] = '\0';
+ dbg(event->udev, "'%s' -> '%s' (%zu)\n", src, dest, l);
+ return l;
+}
+
+static int spawn_exec(struct udev_event *event,
+ const char *cmd, char *const argv[], char **envp, const sigset_t *sigmask,
+ int fd_stdout, int fd_stderr)
+{
+ struct udev *udev = event->udev;
+ int err;
+ int fd;
+
+ /* discard child output or connect to pipe */
+ fd = open("/dev/null", O_RDWR);
+ if (fd >= 0) {
+ dup2(fd, STDIN_FILENO);
+ if (fd_stdout < 0)
+ dup2(fd, STDOUT_FILENO);
+ if (fd_stderr < 0)
+ dup2(fd, STDERR_FILENO);
+ close(fd);
+ } else {
+ err(udev, "open /dev/null failed: %m\n");
+ }
+
+ /* connect pipes to std{out,err} */
+ if (fd_stdout >= 0) {
+ dup2(fd_stdout, STDOUT_FILENO);
+ close(fd_stdout);
+ }
+ if (fd_stderr >= 0) {
+ dup2(fd_stderr, STDERR_FILENO);
+ close(fd_stderr);
+ }
+
+ /* terminate child in case parent goes away */
+ prctl(PR_SET_PDEATHSIG, SIGTERM);
+
+ /* restore original udev sigmask before exec */
+ if (sigmask)
+ sigprocmask(SIG_SETMASK, sigmask, NULL);
+
+ execve(argv[0], argv, envp);
+
+ /* exec failed */
+ err = -errno;
+ err(udev, "failed to execute '%s' '%s': %m\n", argv[0], cmd);
+ return err;
+}
+
+static void spawn_read(struct udev_event *event,
+ const char *cmd,
+ int fd_stdout, int fd_stderr,
+ char *result, size_t ressize)
+{
+ struct udev *udev = event->udev;
+ size_t respos = 0;
+ int fd_ep = -1;
+ struct epoll_event ep_outpipe, ep_errpipe;
+
+ /* read from child if requested */
+ if (fd_stdout < 0 && fd_stderr < 0)
+ return;
+
+ fd_ep = epoll_create1(EPOLL_CLOEXEC);
+ if (fd_ep < 0) {
+ err(udev, "error creating epoll fd: %m\n");
+ goto out;
+ }
+
+ if (fd_stdout >= 0) {
+ memset(&ep_outpipe, 0, sizeof(struct epoll_event));
+ ep_outpipe.events = EPOLLIN;
+ ep_outpipe.data.ptr = &fd_stdout;
+ if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe) < 0) {
+ err(udev, "fail to add fd to epoll: %m\n");
+ goto out;
+ }
+ }
+
+ if (fd_stderr >= 0) {
+ memset(&ep_errpipe, 0, sizeof(struct epoll_event));
+ ep_errpipe.events = EPOLLIN;
+ ep_errpipe.data.ptr = &fd_stderr;
+ if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe) < 0) {
+ err(udev, "fail to add fd to epoll: %m\n");
+ goto out;
+ }
+ }
+
+ /* read child output */
+ while (fd_stdout >= 0 || fd_stderr >= 0) {
+ int timeout;
+ int fdcount;
+ struct epoll_event ev[4];
+ int i;
+
+ if (event->timeout_usec > 0) {
+ unsigned long long age_usec;
+
+ age_usec = now_usec() - event->birth_usec;
+ if (age_usec >= event->timeout_usec) {
+ err(udev, "timeout '%s'\n", cmd);
+ goto out;
+ }
+ timeout = ((event->timeout_usec - age_usec) / 1000) + 1000;
+ } else {
+ timeout = -1;
+ }
+
+ fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), timeout);
+ if (fdcount < 0) {
+ if (errno == EINTR)
+ continue;
+ err(udev, "failed to poll: %m\n");
+ goto out;
+ }
+ if (fdcount == 0) {
+ err(udev, "timeout '%s'\n", cmd);
+ goto out;
+ }
+
+ for (i = 0; i < fdcount; i++) {
+ int *fd = (int *)ev[i].data.ptr;
+
+ 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 {
+ err(udev, "'%s' ressize %zd too short\n", 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')
+ info(udev, "'%s'(%s) '%s'\n", cmd, *fd == fd_stdout ? "out" : "err" , line);
+ }
+ }
+ } else if (ev[i].events & EPOLLHUP) {
+ if (epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL) < 0) {
+ err(udev, "failed to remove fd from epoll: %m\n");
+ goto out;
+ }
+ *fd = -1;
+ }
+ }
+ }
+
+ /* return the child's stdout string */
+ if (result != NULL) {
+ result[respos] = '\0';
+ dbg(udev, "result='%s'\n", result);
+ }
+out:
+ if (fd_ep >= 0)
+ close(fd_ep);
+}
+
+static int spawn_wait(struct udev_event *event, const char *cmd, pid_t pid)
+{
+ struct udev *udev = event->udev;
+ struct pollfd pfd[1];
+ int err = 0;
+
+ pfd[0].events = POLLIN;
+ pfd[0].fd = event->fd_signal;
+
+ while (pid > 0) {
+ int timeout;
+ int fdcount;
+
+ if (event->timeout_usec > 0) {
+ unsigned long long age_usec;
+
+ age_usec = now_usec() - event->birth_usec;
+ if (age_usec >= event->timeout_usec)
+ timeout = 1000;
+ else
+ timeout = ((event->timeout_usec - age_usec) / 1000) + 1000;
+ } else {
+ timeout = -1;
+ }
+
+ fdcount = poll(pfd, 1, timeout);
+ if (fdcount < 0) {
+ if (errno == EINTR)
+ continue;
+ err = -errno;
+ err(udev, "failed to poll: %m\n");
+ goto out;
+ }
+ if (fdcount == 0) {
+ err(udev, "timeout: killing '%s' [%u]\n", cmd, pid);
+ kill(pid, SIGKILL);
+ }
+
+ if (pfd[0].revents & POLLIN) {
+ struct signalfd_siginfo fdsi;
+ int status;
+ ssize_t size;
+
+ size = read(event->fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
+ if (size != sizeof(struct signalfd_siginfo))
+ continue;
+
+ switch (fdsi.ssi_signo) {
+ case SIGTERM:
+ event->sigterm = true;
+ break;
+ case SIGCHLD:
+ if (waitpid(pid, &status, WNOHANG) < 0)
+ break;
+ if (WIFEXITED(status)) {
+ info(udev, "'%s' [%u] exit with return code %i\n", cmd, pid, WEXITSTATUS(status));
+ if (WEXITSTATUS(status) != 0)
+ err = -1;
+ } else if (WIFSIGNALED(status)) {
+ err(udev, "'%s' [%u] terminated by signal %i (%s)\n", cmd, pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
+ err = -1;
+ } else if (WIFSTOPPED(status)) {
+ err(udev, "'%s' [%u] stopped\n", cmd, pid);
+ err = -1;
+ } else if (WIFCONTINUED(status)) {
+ err(udev, "'%s' [%u] continued\n", cmd, pid);
+ err = -1;
+ } else {
+ err(udev, "'%s' [%u] exit with status 0x%04x\n", cmd, pid, status);
+ err = -1;
+ }
+ pid = 0;
+ break;
+ }
+ }
+ }
+out:
+ return err;
+}
+
+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++;
+ }
+ dbg(udev, "argv[%i] '%s'\n", i, argv[i]);
+ i++;
+ }
+out:
+ argv[i] = NULL;
+ if (argc)
+ *argc = i;
+ return 0;
+}
+
+int udev_event_spawn(struct udev_event *event,
+ const char *cmd, char **envp, const sigset_t *sigmask,
+ char *result, size_t ressize)
+{
+ struct udev *udev = event->udev;
+ int outpipe[2] = {-1, -1};
+ int errpipe[2] = {-1, -1};
+ pid_t pid;
+ char arg[UTIL_PATH_SIZE];
+ char *argv[128];
+ char program[UTIL_PATH_SIZE];
+ int err = 0;
+
+ util_strscpy(arg, sizeof(arg), cmd);
+ udev_build_argv(event->udev, arg, NULL, argv);
+
+ /* pipes from child to parent */
+ if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) {
+ if (pipe2(outpipe, O_NONBLOCK) != 0) {
+ err = -errno;
+ err(udev, "pipe failed: %m\n");
+ goto out;
+ }
+ }
+ if (udev_get_log_priority(udev) >= LOG_INFO) {
+ if (pipe2(errpipe, O_NONBLOCK) != 0) {
+ err = -errno;
+ err(udev, "pipe failed: %m\n");
+ goto out;
+ }
+ }
+
+ /* allow programs in /usr/lib/udev/ to be called without the path */
+ if (argv[0][0] != '/') {
+ util_strscpyl(program, sizeof(program), UDEVLIBEXECDIR "/", argv[0], NULL);
+ argv[0] = program;
+ }
+
+ pid = fork();
+ switch(pid) {
+ case 0:
+ /* child closes parent's ends of pipes */
+ if (outpipe[READ_END] >= 0) {
+ close(outpipe[READ_END]);
+ outpipe[READ_END] = -1;
+ }
+ if (errpipe[READ_END] >= 0) {
+ close(errpipe[READ_END]);
+ errpipe[READ_END] = -1;
+ }
+
+ info(udev, "starting '%s'\n", cmd);
+
+ err = spawn_exec(event, cmd, argv, envp, sigmask,
+ outpipe[WRITE_END], errpipe[WRITE_END]);
+
+ _exit(2 );
+ case -1:
+ err(udev, "fork of '%s' failed: %m\n", cmd);
+ err = -1;
+ goto out;
+ default:
+ /* parent closed child's ends of pipes */
+ if (outpipe[WRITE_END] >= 0) {
+ close(outpipe[WRITE_END]);
+ outpipe[WRITE_END] = -1;
+ }
+ if (errpipe[WRITE_END] >= 0) {
+ close(errpipe[WRITE_END]);
+ errpipe[WRITE_END] = -1;
+ }
+
+ spawn_read(event, cmd,
+ outpipe[READ_END], errpipe[READ_END],
+ result, ressize);
+
+ err = spawn_wait(event, cmd, pid);
+ }
+
+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 void rename_netif_kernel_log(struct ifreq ifr)
+{
+ int klog;
+ FILE *f;
+
+ klog = open("/dev/kmsg", O_WRONLY);
+ if (klog < 0)
+ return;
+
+ f = fdopen(klog, "w");
+ if (f == NULL) {
+ close(klog);
+ return;
+ }
+
+ fprintf(f, "<30>udevd[%u]: renamed network interface %s to %s\n",
+ getpid(), ifr.ifr_name, ifr.ifr_newname);
+ fclose(f);
+}
+
+static int rename_netif(struct udev_event *event)
+{
+ struct udev_device *dev = event->dev;
+ int sk;
+ struct ifreq ifr;
+ int loop;
+ int err;
+
+ info(event->udev, "changing net interface name from '%s' to '%s'\n",
+ udev_device_get_sysname(dev), event->name);
+
+ sk = socket(PF_INET, SOCK_DGRAM, 0);
+ if (sk < 0) {
+ err = -errno;
+ err(event->udev, "error opening socket: %m\n");
+ return err;
+ }
+
+ memset(&ifr, 0x00, sizeof(struct ifreq));
+ util_strscpy(ifr.ifr_name, IFNAMSIZ, udev_device_get_sysname(dev));
+ util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
+ err = ioctl(sk, SIOCSIFNAME, &ifr);
+ if (err == 0) {
+ rename_netif_kernel_log(ifr);
+ goto out;
+ }
+
+ /* keep trying if the destination interface name already exists */
+ err = -errno;
+ if (err != -EEXIST)
+ goto out;
+
+ /* free our own name, another process may wait for us */
+ snprintf(ifr.ifr_newname, IFNAMSIZ, "rename%u", udev_device_get_ifindex(dev));
+ err = ioctl(sk, SIOCSIFNAME, &ifr);
+ if (err < 0) {
+ err = -errno;
+ goto out;
+ }
+
+ /* log temporary name */
+ rename_netif_kernel_log(ifr);
+
+ /* wait a maximum of 90 seconds for our target to become available */
+ util_strscpy(ifr.ifr_name, IFNAMSIZ, ifr.ifr_newname);
+ util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
+ loop = 90 * 20;
+ while (loop--) {
+ const struct timespec duration = { 0, 1000 * 1000 * 1000 / 20 };
+
+ dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
+ event->name, (90 * 20) - loop);
+ nanosleep(&duration, NULL);
+
+ err = ioctl(sk, SIOCSIFNAME, &ifr);
+ if (err == 0) {
+ rename_netif_kernel_log(ifr);
+ break;
+ }
+ err = -errno;
+ if (err != -EEXIST)
+ break;
+ }
+
+out:
+ if (err < 0)
+ err(event->udev, "error changing net interface name %s to %s: %m\n", ifr.ifr_name, ifr.ifr_newname);
+ close(sk);
+ return err;
+}
+
+int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules, const sigset_t *sigmask)
+{
+ struct udev_device *dev = event->dev;
+ int err = 0;
+
+ if (udev_device_get_subsystem(dev) == NULL)
+ return -1;
+
+ if (strcmp(udev_device_get_action(dev), "remove") == 0) {
+ udev_device_read_db(dev, NULL);
+ udev_device_delete_db(dev);
+ udev_device_tag_index(dev, NULL, false);
+
+ if (major(udev_device_get_devnum(dev)) != 0)
+ udev_watch_end(event->udev, dev);
+
+ udev_rules_apply_to_event(rules, event, sigmask);
+
+ if (major(udev_device_get_devnum(dev)) != 0)
+ udev_node_remove(dev);
+ } else {
+ event->dev_db = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
+ if (event->dev_db != NULL) {
+ udev_device_read_db(event->dev_db, NULL);
+ udev_device_set_info_loaded(event->dev_db);
+
+ /* disable watch during event processing */
+ if (major(udev_device_get_devnum(dev)) != 0)
+ udev_watch_end(event->udev, event->dev_db);
+ }
+
+ udev_rules_apply_to_event(rules, event, sigmask);
+
+ /* rename a new network interface, if needed */
+ if (udev_device_get_ifindex(dev) > 0 && strcmp(udev_device_get_action(dev), "add") == 0 &&
+ event->name != NULL && strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
+ char syspath[UTIL_PATH_SIZE];
+ char *pos;
+
+ err = rename_netif(event);
+ if (err == 0) {
+ info(event->udev, "renamed netif to '%s'\n", event->name);
+
+ /* remember old name */
+ udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
+
+ /* now change the devpath, because the kernel device name has changed */
+ util_strscpy(syspath, sizeof(syspath), udev_device_get_syspath(dev));
+ pos = strrchr(syspath, '/');
+ if (pos != NULL) {
+ pos++;
+ util_strscpy(pos, sizeof(syspath) - (pos - syspath), event->name);
+ udev_device_set_syspath(event->dev, syspath);
+ udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
+ info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
+ }
+ }
+ }
+
+ if (major(udev_device_get_devnum(dev)) > 0) {
+ /* 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->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;
+ }
+ }
+
+ udev_node_add(dev, event->mode, event->uid, event->gid);
+ }
+
+ /* preserve old, or get new initialization timestamp */
+ if (event->dev_db != NULL && udev_device_get_usec_initialized(event->dev_db) > 0)
+ udev_device_set_usec_initialized(event->dev, udev_device_get_usec_initialized(event->dev_db));
+ else if (udev_device_get_usec_initialized(event->dev) == 0)
+ udev_device_set_usec_initialized(event->dev, now_usec());
+
+ /* (re)write database file */
+ udev_device_update_db(dev);
+ udev_device_tag_index(dev, event->dev_db, true);
+ udev_device_set_is_initialized(dev);
+
+ udev_device_unref(event->dev_db);
+ event->dev_db = NULL;
+ }
+out:
+ return err;
+}
+
+int udev_event_execute_run(struct udev_event *event, const sigset_t *sigmask)
+{
+ struct udev_list_entry *list_entry;
+ int err = 0;
+
+ dbg(event->udev, "executing run list\n");
+ udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
+ const char *cmd = udev_list_entry_get_name(list_entry);
+
+ if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
+ struct udev_monitor *monitor;
+
+ monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
+ if (monitor == NULL)
+ continue;
+ udev_monitor_send_device(monitor, NULL, event->dev);
+ udev_monitor_unref(monitor);
+ } else {
+ char program[UTIL_PATH_SIZE];
+ char **envp;
+
+ if (event->exec_delay > 0) {
+ info(event->udev, "delay execution of '%s'\n", program);
+ sleep(event->exec_delay);
+ }
+
+ udev_event_apply_format(event, cmd, program, sizeof(program));
+ envp = udev_device_get_properties_envp(event->dev);
+ if (udev_event_spawn(event, program, envp, sigmask, NULL, 0) < 0) {
+ if (udev_list_entry_get_num(list_entry))
+ err = -1;
+ }
+ }
+ }
+ return err;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-07 22:05:58 +0000