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Diffstat (limited to 'src/core/namespace.c')
-rw-r--r--src/core/namespace.c44
1 files changed, 11 insertions, 33 deletions
diff --git a/src/core/namespace.c b/src/core/namespace.c
index eb88574f8f..2b8b707df5 100644
--- a/src/core/namespace.c
+++ b/src/core/namespace.c
@@ -643,16 +643,7 @@ int setup_tmp_dirs(const char *id, char **tmp_dir, char **var_tmp_dir) {
int setup_netns(int netns_storage_socket[2]) {
_cleanup_close_ int netns = -1;
- union {
- struct cmsghdr cmsghdr;
- uint8_t buf[CMSG_SPACE(sizeof(int))];
- } control = {};
- struct msghdr mh = {
- .msg_control = &control,
- .msg_controllen = sizeof(control),
- };
- struct cmsghdr *cmsg;
- int r;
+ int r, q;
assert(netns_storage_socket);
assert(netns_storage_socket[0] >= 0);
@@ -669,12 +660,8 @@ int setup_netns(int netns_storage_socket[2]) {
if (lockf(netns_storage_socket[0], F_LOCK, 0) < 0)
return -errno;
- if (recvmsg(netns_storage_socket[0], &mh, MSG_DONTWAIT|MSG_CMSG_CLOEXEC) < 0) {
- if (errno != EAGAIN) {
- r = -errno;
- goto fail;
- }
-
+ netns = receive_one_fd(netns_storage_socket[0], MSG_DONTWAIT);
+ if (netns == -EAGAIN) {
/* Nothing stored yet, so let's create a new namespace */
if (unshare(CLONE_NEWNET) < 0) {
@@ -691,15 +678,13 @@ int setup_netns(int netns_storage_socket[2]) {
}
r = 1;
- } else {
- /* Yay, found something, so let's join the namespace */
- CMSG_FOREACH(cmsg, &mh)
- if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
- assert(cmsg->cmsg_len == CMSG_LEN(sizeof(int)));
- netns = *(int*) CMSG_DATA(cmsg);
- }
+ } else if (netns < 0) {
+ r = netns;
+ goto fail;
+ } else {
+ /* Yay, found something, so let's join the namespace */
if (setns(netns, CLONE_NEWNET) < 0) {
r = -errno;
goto fail;
@@ -708,21 +693,14 @@ int setup_netns(int netns_storage_socket[2]) {
r = 0;
}
- cmsg = CMSG_FIRSTHDR(&mh);
- cmsg->cmsg_level = SOL_SOCKET;
- cmsg->cmsg_type = SCM_RIGHTS;
- cmsg->cmsg_len = CMSG_LEN(sizeof(int));
- memcpy(CMSG_DATA(cmsg), &netns, sizeof(int));
- mh.msg_controllen = cmsg->cmsg_len;
-
- if (sendmsg(netns_storage_socket[1], &mh, MSG_DONTWAIT|MSG_NOSIGNAL) < 0) {
- r = -errno;
+ q = send_one_fd(netns_storage_socket[1], netns, MSG_DONTWAIT);
+ if (q < 0) {
+ r = q;
goto fail;
}
fail:
lockf(netns_storage_socket[0], F_ULOCK, 0);
-
return r;
}