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nspawn: check with udev before we take possession of an interface

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This commit is contained in:
Lennart Poettering 2014-02-13 14:38:02 +01:00
parent b88eb17a7a
commit 7e2270246b
2 changed files with 23 additions and 0 deletions
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1
Makefile.am
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@ -1849,6 +1849,7 @@ systemd_nspawn_LDADD = \
libsystemd-capability.la \
libsystemd-internal.la \
libsystemd-daemon-internal.la \
libudev-internal.la \
libsystemd-shared.la
# ------------------------------------------------------------------------------

22
src/nspawn/nspawn.c
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@ -73,6 +73,7 @@
#include "env-util.h"
#include "def.h"
#include "rtnl-util.h"
#include "udev-util.h"
typedef enum LinkJournal {
LINK_NO,
@ -1256,6 +1257,7 @@ static int reset_audit_loginuid(void) {
static int move_network_interfaces(pid_t pid) {
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
_cleanup_udev_unref_ struct udev *udev = NULL;
char **i;
int r;
@ -1271,8 +1273,16 @@ static int move_network_interfaces(pid_t pid) {
return r;
}
udev = udev_new();
if (!udev) {
log_error("Failed to connect to udev.");
return -ENOMEM;
}
STRV_FOREACH(i, arg_network_interfaces) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
_cleanup_udev_device_unref_ struct udev_device *d = NULL;
char ifi_str[2 + DECIMAL_STR_MAX(int)];
int ifi;
ifi = (int) if_nametoindex(*i);
@ -1281,6 +1291,18 @@ static int move_network_interfaces(pid_t pid) {
return -errno;
}
sprintf(ifi_str, "n%i", ifi);
d = udev_device_new_from_device_id(udev, ifi_str);
if (!d) {
log_error("Failed to get udev device for interface %s: %m", *i);
return -errno;
}
if (udev_device_get_is_initialized(d) <= 0) {
log_error("Network interface %s is not initialized yet.", *i);
return -EBUSY;
}
r = sd_rtnl_message_new_link(RTM_NEWLINK, ifi, &m);
if (r < 0) {
log_error("Failed to allocate netlink message: %s", strerror(-r));