/*
* 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 <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 <poll.h>
#include <sys/epoll.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/signalfd.h>
#include <linux/sockios.h>
#include <sys/sysmacros.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 = 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->fd_signal = -1;
event->birth_usec = now(CLOCK_MONOTONIC);
return event;
}
void udev_event_unref(struct udev_event *event) {
if (event == NULL)
return;
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,
bool replace_whitespace) {
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;
from = src;
s = dest;
l = size;
for (;;) {
enum subst_type type = SUBST_UNKNOWN;
char attrbuf[UTIL_PATH_SIZE], sbuf[UTIL_PATH_SIZE];
char *attr = NULL, *_s;
size_t _l;
bool replws = replace_whitespace;
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;
}
/* result subst handles space as field separator */
if (type == SUBST_RESULT)
replws = false;
if (replws) {
/* store dest string ptr and remaining len */
_s = s;
_l = l;
/* temporarily use sbuf */
s = sbuf;
l = UTIL_PATH_SIZE;
}
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 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;
}
/* replace whitespace in sbuf and copy to dest */
if (replws) {
size_t tmplen = UTIL_PATH_SIZE - l;
/* restore s and l to dest string values */
s = _s;
l = _l;
/* copy ws-replaced value to s */
tmplen = util_replace_whitespace(sbuf, s, MIN(tmplen, l));
l -= tmplen;
s += tmplen;
}
}
out:
s[0] = '\0';
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) {
_cleanup_close_ int fd = -1;
/* 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);
} else
log_error_errno(errno, "open /dev/null failed: %m");
/* connect pipes to std{out,err} */
if (fd_stdout >= 0) {
dup2(fd_stdout, STDOUT_FILENO);
safe_close(fd_stdout);
}
if (fd_stderr >= 0) {
dup2(fd_stderr, STDERR_FILENO);
safe_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 */
log_error_errno(errno, "failed to execute '%s' '%s': %m", argv[0], cmd);
return -errno;
}
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 spawn_wait(struct udev_event *event,
usec_t timeout_usec,
usec_t timeout_warn_usec,
const char *cmd, pid_t pid) {
struct pollfd pfd[1];
int err = 0;
pfd[0].events = POLLIN;
pfd[0].fd = event->fd_signal;
while (pid > 0) {
int timeout;
int timeout_warn = 0;
int fdcount;
if (timeout_usec > 0) {
usec_t age_usec;
age_usec = now(CLOCK_MONOTONIC) - event->birth_usec;
if (age_usec >= timeout_usec)
timeout = 1000;
else {
if (timeout_warn_usec > 0)
timeout_warn = ((timeout_warn_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
timeout = ((timeout_usec - timeout_warn_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
}
} else {
timeout = -1;
}
fdcount = poll(pfd, 1, timeout_warn);
if (fdcount < 0) {
if (errno == EINTR)
continue;
err = -errno;
log_error_errno(errno, "failed to poll: %m");
goto out;
}
if (fdcount == 0) {
log_warning("slow: '%s' ["PID_FMT"]", cmd, pid);
fdcount = poll(pfd, 1, timeout);
if (fdcount < 0) {
if (errno == EINTR)
continue;
err = -errno;
log_error_errno(errno, "failed to poll: %m");
goto out;
}
if (fdcount == 0) {
log_error("timeout: killing '%s' ["PID_FMT"]", 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)) {
log_debug("'%s' ["PID_FMT"] exit with return code %i", cmd, pid, WEXITSTATUS(status));
if (WEXITSTATUS(status) != 0)
err = -1;
} else if (WIFSIGNALED(status)) {
log_error("'%s' ["PID_FMT"] terminated by signal %i (%s)", cmd, pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
err = -1;
} else if (WIFSTOPPED(status)) {
log_error("'%s' ["PID_FMT"] stopped", cmd, pid);
err = -1;
} else if (WIFCONTINUED(status)) {
log_error("'%s' ["PID_FMT"] continued", cmd, pid);
err = -1;
} else {
log_error("'%s' ["PID_FMT"] exit with status 0x%04x", 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 (IN_SET(pos[0], '\'', '"')) {
/* do not separate quotes or double quotes */
char delim[2] = { pos[0], '\0' };
pos++;
argv[i] = strsep(&pos, delim);
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,
const char *cmd, char **envp, const sigset_t *sigmask,
char *result, size_t ressize) {
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;
strscpy(arg, sizeof(arg), cmd);
udev_build_argv(event->udev, arg, NULL, argv);
/* pipes from child to parent */
if (result != NULL || log_get_max_level() >= LOG_INFO) {
if (pipe2(outpipe, O_NONBLOCK) != 0) {
err = -errno;
log_error_errno(errno, "pipe failed: %m");
goto out;
}
}
if (log_get_max_level() >= LOG_INFO) {
if (pipe2(errpipe, O_NONBLOCK) != 0) {
err = -errno;
log_error_errno(errno, "pipe failed: %m");
goto out;
}
}
/* allow programs in /usr/lib/udev/ to be called without the path */
if (argv[0][0] != '/') {
strscpyl(program, sizeof(program), UDEV_LIBEXEC_DIR "/", argv[0], NULL);
#ifdef HAVE_SPLIT_USR
if(access(program, X_OK))
strscpyl(program, sizeof(program), "/usr/lib/udev/", argv[0], NULL);
if(access(program, X_OK))
strscpyl(program, sizeof(program), "/lib/udev/", argv[0], NULL);
#endif
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;
}
log_debug("starting '%s'", cmd);
spawn_exec(event, cmd, argv, envp, sigmask,
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 */
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,
timeout_usec,
cmd,
outpipe[READ_END], errpipe[READ_END],
result, ressize);
err = spawn_wait(event, timeout_usec, timeout_warn_usec, 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;
}
#ifdef ENABLE_RULE_GENERATOR
/* function to return the count of rules that assign NAME= to a value matching arg#2 , defined in udev-rules.c */
int udev_rules_assigning_name_to(struct udev_rules *rules,const char *match_name);
#endif
static int rename_netif_dev_fromname_toname(struct udev_device *dev,const char *oldname,const char *name) {
int r;
int sk;
struct ifreq ifr;
log_debug("changing net interface name from '%s' to '%s'\n",oldname,name);
sk = socket(PF_INET, SOCK_DGRAM, 0);
if (sk < 0)
return log_error_errno(-errno, "error opening socket: %m");
memzero(&ifr, sizeof(struct ifreq));
strscpy(ifr.ifr_name, IFNAMSIZ, oldname);
strscpy(ifr.ifr_newname, IFNAMSIZ, name);
r = ioctl(sk, SIOCSIFNAME, &ifr);
#ifdef ENABLE_RULE_GENERATOR
int loop;
struct ifreq ifr_tmp;
if (r == 0) {
log_info("renamed network interface %s to %s\n", ifr.ifr_name, ifr.ifr_newname);
goto out;
}
/* keep trying if the destination interface name already exists */
log_debug("collision on rename of network interface %s to %s , retrying until timeout\n",
ifr.ifr_name, ifr.ifr_newname);
/* there has been a collision so rename my name to a temporal name, letting other one to rename to my name, freeying its name... */
memzero(&ifr_tmp, sizeof(struct ifreq));
strscpy(ifr_tmp.ifr_name, IFNAMSIZ, oldname);
snprintf(ifr_tmp.ifr_newname, IFNAMSIZ, "rename_%s", oldname);
r = ioctl(sk, SIOCSIFNAME, &ifr_tmp);
log_info("Temporarily renamed network interface %s to %s\n", ifr_tmp.ifr_name, ifr_tmp.ifr_newname);
/* we have changed our name so in subsequents tries i should rename my temporal name to the wanted one */
strscpy(ifr.ifr_name, IFNAMSIZ, ifr_tmp.ifr_newname);
r = -errno;
if (r != -EEXIST)
goto out;
/* wait a maximum of 90 seconds for our target to become available */
loop = 90 * 20;
while (loop--) {
const struct timespec duration = { 0, 1000 * 1000 * 1000 / 20 };
nanosleep(&duration, NULL);
r = ioctl(sk, SIOCSIFNAME, &ifr);
if (r == 0) {
log_info("renamed network interface %s to %s\n", ifr.ifr_name, ifr.ifr_newname);
break;
}
r = -errno;
if (r != -EEXIST)
break;
}
out:
#endif
if (r < 0)
log_error_errno(-errno, "Error changing net interface name %s to %s: %m\n", ifr.ifr_name, ifr.ifr_newname);
else
log_debug("renamed network interface '%s' to '%s'", oldname, name);
close(sk);
return r;
}
static int rename_netif(struct udev_event *event) {
return rename_netif_dev_fromname_toname(event->dev,udev_device_get_sysname(event->dev),event->name);
}
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,
const sigset_t *sigmask) {
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,
sigmask);
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,
sigmask);
/* rename a new network interface, if needed */
/* ENABLE_RULE_GENERATOR conditional:
* if this is a net iface, and it is an add event,
* and as long as all of the following are FALSE:
* - no NAME target and the current name is not being used
* - there is a NAME target and it is the same as the current name
* - the rules can successfully be searched for the current name (not really part of the conditional)
* the run the rename.
*
* note - udev_rules_assigning_name_to is run when event->name is NULL to ensure renames happen,
* but also on its own to check if a temp-rename is necessary when event->name exists.
*
* A temp-rename is necessary when:
* - there is no rule renaming the current iface but the current name IS used in some other rule
* - there is a rule renaming the current iface,
* the current name IS used AND the target name != the current name
*/
#ifdef ENABLE_RULE_GENERATOR
int r;
if (udev_device_get_ifindex(dev) > 0 && streq(udev_device_get_action(dev), "add") &&
(event->name == NULL && (r=udev_rules_assigning_name_to(rules,udev_device_get_sysname(dev))) > 0 ||
event->name != NULL && !streq(event->name, udev_device_get_sysname(dev)))) {
char syspath[UTIL_PATH_SIZE];
char *pos;
char *finalifname = event->name;
char newifname[IFNAMSIZ];
/* r is the number of rules that assign a device with NAME= this sysname */
if (r > 0 || (r=udev_rules_assigning_name_to(rules,udev_device_get_sysname(dev))) > 0) {
/* have a conflict, rename to a temp name */
char *newpos;
int ifidnum;
/* build the temporary iface name */
strscpy(newifname, IFNAMSIZ, udev_device_get_sysname(dev));
newpos=pos=&newifname[strcspn(newifname,"0123456789")];
ifidnum=(int)strtol(pos,&newpos,10);
*pos='\0';
if (newpos > pos && *newpos == '\0') /* append new iface num to name */
/* use udev_device_get_ifindex(dev) as it is unique to every iface */
snprintf(pos,IFNAMSIZ+(newifname-pos), "%d", 128 - udev_device_get_ifindex(dev));
/* note, r > 0, which will skip the post-rename stuff if no rename occurs */
/* if sysname isn't already the tmpname (ie there is no numeric component), do the rename */
if (!streq(newifname,udev_device_get_sysname(dev))) {
r = rename_netif_dev_fromname_toname(dev,udev_device_get_sysname(dev),newifname);
if (r == 0) {
finalifname = newifname;
log_debug("renamed netif to '%s' for collision avoidance\n", newifname);
} else {
log_error("could not rename netif to '%s' for collision avoidance\n",newifname);
}
}
/* rename it now to its final target if its not already there */
if (event->name != NULL && !streq(event->name, newifname)) {
r = rename_netif_dev_fromname_toname(dev,newifname,event->name);
if (r == 0)
finalifname = event->name;
}
} else { /* no need to rename to a tempname first, do a regular direct rename to event->name */
r = 1; /* skip the post-rename stuff if no rename occurs */
if (!streq(event->name, udev_device_get_sysname(dev)))
r = rename_netif(event);
}
if (r == 0) {
log_debug("renamed netif to '%s'\n", finalifname);
r = udev_device_rename(dev, finalifname);
#else
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);
#endif
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, const sigset_t *sigmask) {
struct udev_list_entry *list_entry;
udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
const char *cmd = udev_list_entry_get_name(list_entry);
enum udev_builtin_cmd builtin_cmd = udev_list_entry_get_num(list_entry);
if (builtin_cmd < UDEV_BUILTIN_MAX) {
char command[UTIL_PATH_SIZE];
udev_event_apply_format(event, cmd, command, sizeof(command), false);
udev_builtin_run(event->dev, builtin_cmd, command, false);
} else {
char program[UTIL_PATH_SIZE];
char **envp;
if (event->exec_delay > 0) {
log_debug("delay execution of '%s'", program);
sleep(event->exec_delay);
}
udev_event_apply_format(event, cmd, program, sizeof(program), false);
envp = udev_device_get_properties_envp(event->dev);
udev_event_spawn(event, timeout_usec, timeout_warn_usec, program, envp, sigmask, NULL, 0);
}
}
}