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Merge pull request #715 from justincormack/runc-vendor-up

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Update the opencontainers/runc vendor
This commit is contained in:
Qiang Huang 2017-04-12 09:18:05 +08:00 committed by GitHub
commit f108e08703
8 changed files with 239 additions and 253 deletions
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2
vendor.conf
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@ -11,7 +11,7 @@ github.com/matttproud/golang_protobuf_extensions v1.0.0
github.com/docker/go-units v0.3.1
github.com/gogo/protobuf d2e1ade2d719b78fe5b061b4c18a9f7111b5bdc8
github.com/golang/protobuf 8ee79997227bf9b34611aee7946ae64735e6fd93
github.com/opencontainers/runc ce450bcc6c135cae93ee2a99d41a308c179ff6dc
github.com/opencontainers/runc 50401b5b4c2e01e4f1372b73a021742deeaf4e2d
github.com/opencontainers/runtime-spec 035da1dca3dfbb00d752eb58b0b158d6129f3776
github.com/Sirupsen/logrus v0.11.0
github.com/stevvooe/go-btrfs ea304655a3ed8f00773db1844f921d12541ee0d1

7
vendor/github.com/opencontainers/runc/README.md generated vendored
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@ -2,6 +2,7 @@
[![Build Status](https://travis-ci.org/opencontainers/runc.svg?branch=master)](https://travis-ci.org/opencontainers/runc)
[![Go Report Card](https://goreportcard.com/badge/github.com/opencontainers/runc)](https://goreportcard.com/report/github.com/opencontainers/runc)
[![GoDoc](https://godoc.org/github.com/opencontainers/runc?status.svg)](https://godoc.org/github.com/opencontainers/runc)
## Introduction
@ -76,6 +77,12 @@ You can run a specific test case by setting the `TESTFLAGS` variable.
# make test TESTFLAGS="-run=SomeTestFunction"
```
### Dependencies Management
`runc` uses [vndr](https://github.com/LK4D4/vndr) for dependencies management.
Please refer to [vndr](https://github.com/LK4D4/vndr) for how to add or update
new dependencies.
## Using runc
### Creating an OCI Bundle

11
vendor/github.com/opencontainers/runc/libcontainer/README.md generated vendored
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@ -1,3 +1,7 @@
# libcontainer
[![GoDoc](https://godoc.org/github.com/opencontainers/runc/libcontainer?status.svg)](https://godoc.org/github.com/opencontainers/runc/libcontainer)
Libcontainer provides a native Go implementation for creating containers
with namespaces, cgroups, capabilities, and filesystem access controls.
It allows you to manage the lifecycle of the container performing additional operations
@ -16,7 +20,14 @@ the current binary (/proc/self/exe) to be executed as the init process, and use
arg "init", we call the first step process "bootstrap", so you always need a "init"
function as the entry of "bootstrap".
In addition to the go init function the early stage bootstrap is handled by importing
[nsenter](https://github.com/opencontainers/runc/blob/master/libcontainer/nsenter/README.md).
```go
import (
_ "github.com/opencontainers/runc/libcontainer/nsenter"
)
func init() {
if len(os.Args) > 1 && os.Args[1] == "init" {
runtime.GOMAXPROCS(1)

186
vendor/github.com/opencontainers/runc/libcontainer/nsenter/nsexec.c generated vendored
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@ -33,7 +33,8 @@ enum sync_t {
SYNC_USERMAP_ACK = 0x41, /* Mapping finished by the parent. */
SYNC_RECVPID_PLS = 0x42, /* Tell parent we're sending the PID. */
SYNC_RECVPID_ACK = 0x43, /* PID was correctly received by parent. */
SYNC_CHILD_READY = 0x44, /* The grandchild is ready to return. */
SYNC_GRANDCHILD = 0x44, /* The grandchild is ready to run. */
SYNC_CHILD_READY = 0x45, /* The child or grandchild is ready to return. */
/* XXX: This doesn't help with segfaults and other such issues. */
SYNC_ERR = 0xFF, /* Fatal error, no turning back. The error code follows. */
@ -71,6 +72,9 @@ struct nlconfig_t {
char *namespaces;
size_t namespaces_len;
uint8_t is_setgroup;
uint8_t is_rootless;
char *oom_score_adj;
size_t oom_score_adj_len;
};
/*
@ -83,6 +87,8 @@ struct nlconfig_t {
#define UIDMAP_ATTR 27283
#define GIDMAP_ATTR 27284
#define SETGROUP_ATTR 27285
#define OOM_SCORE_ADJ_ATTR 27286
#define ROOTLESS_ATTR 27287
/*
* Use the raw syscall for versions of glibc which don't include a function for
@ -171,6 +177,7 @@ static void update_setgroups(int pid, enum policy_t setgroup)
policy = "deny";
break;
case SETGROUPS_DEFAULT:
default:
/* Nothing to do. */
return;
}
@ -185,7 +192,7 @@ static void update_setgroups(int pid, enum policy_t setgroup)
}
}
static void update_uidmap(int pid, char *map, int map_len)
static void update_uidmap(int pid, char *map, size_t map_len)
{
if (map == NULL || map_len <= 0)
return;
@ -194,7 +201,7 @@ static void update_uidmap(int pid, char *map, int map_len)
bail("failed to update /proc/%d/uid_map", pid);
}
static void update_gidmap(int pid, char *map, int map_len)
static void update_gidmap(int pid, char *map, size_t map_len)
{
if (map == NULL || map_len <= 0)
return;
@ -203,6 +210,15 @@ static void update_gidmap(int pid, char *map, int map_len)
bail("failed to update /proc/%d/gid_map", pid);
}
static void update_oom_score_adj(char *data, size_t len)
{
if (data == NULL || len <= 0)
return;
if (write_file(data, len, "/proc/self/oom_score_adj") < 0)
bail("failed to update /proc/self/oom_score_adj");
}
/* A dummy function that just jumps to the given jumpval. */
static int child_func(void *arg) __attribute__ ((noinline));
static int child_func(void *arg)
@ -284,7 +300,7 @@ static void nl_parse(int fd, struct nlconfig_t *config)
/* Retrieve the netlink header. */
len = read(fd, &hdr, NLMSG_HDRLEN);
if (len != NLMSG_HDRLEN)
bail("invalid netlink header length %lu", len);
bail("invalid netlink header length %zu", len);
if (hdr.nlmsg_type == NLMSG_ERROR)
bail("failed to read netlink message");
@ -300,7 +316,7 @@ static void nl_parse(int fd, struct nlconfig_t *config)
len = read(fd, data, size);
if (len != size)
bail("failed to read netlink payload, %lu != %lu", len, size);
bail("failed to read netlink payload, %zu != %zu", len, size);
/* Parse the netlink payload. */
config->data = data;
@ -316,6 +332,13 @@ static void nl_parse(int fd, struct nlconfig_t *config)
case CLONE_FLAGS_ATTR:
config->cloneflags = readint32(current);
break;
case ROOTLESS_ATTR:
config->is_rootless = readint8(current);
break;
case OOM_SCORE_ADJ_ATTR:
config->oom_score_adj = current;
config->oom_score_adj_len = payload_len;
break;
case NS_PATHS_ATTR:
config->namespaces = current;
config->namespaces_len = payload_len;
@ -413,7 +436,7 @@ void nsexec(void)
{
int pipenum;
jmp_buf env;
int syncpipe[2];
int sync_child_pipe[2], sync_grandchild_pipe[2];
struct nlconfig_t config = {0};
/*
@ -424,18 +447,43 @@ void nsexec(void)
if (pipenum == -1)
return;
/* make the process non-dumpable */
if (prctl(PR_SET_DUMPABLE, 0, 0, 0, 0) != 0) {
bail("failed to set process as non-dumpable");
}
/* Parse all of the netlink configuration. */
nl_parse(pipenum, &config);
/* Set oom_score_adj. This has to be done before !dumpable because
* /proc/self/oom_score_adj is not writeable unless you're an privileged
* user (if !dumpable is set). All children inherit their parent's
* oom_score_adj value on fork(2) so this will always be propagated
* properly.
*/
update_oom_score_adj(config.oom_score_adj, config.oom_score_adj_len);
/*
* Make the process non-dumpable, to avoid various race conditions that
* could cause processes in namespaces we're joining to access host
* resources (or potentially execute code).
*
* However, if the number of namespaces we are joining is 0, we are not
* going to be switching to a different security context. Thus setting
* ourselves to be non-dumpable only breaks things (like rootless
* containers), which is the recommendation from the kernel folks.
*/
if (config.namespaces) {
if (prctl(PR_SET_DUMPABLE, 0, 0, 0, 0) < 0)
bail("failed to set process as non-dumpable");
}
/* Pipe so we can tell the child when we've finished setting up. */
if (socketpair(AF_LOCAL, SOCK_STREAM, 0, syncpipe) < 0)
if (socketpair(AF_LOCAL, SOCK_STREAM, 0, sync_child_pipe) < 0)
bail("failed to setup sync pipe between parent and child");
/*
* We need a new socketpair to sync with grandchild so we don't have
* race condition with child.
*/
if (socketpair(AF_LOCAL, SOCK_STREAM, 0, sync_grandchild_pipe) < 0)
bail("failed to setup sync pipe between parent and grandchild");
/* TODO: Currently we aren't dealing with child deaths properly. */
/*
@ -494,9 +542,10 @@ void nsexec(void)
* process.
*/
case JUMP_PARENT: {
int len, ready = 0;
int len;
pid_t child;
char buf[JSON_MAX];
bool ready = false;
/* For debugging. */
prctl(PR_SET_NAME, (unsigned long) "runc:[0:PARENT]", 0, 0, 0);
@ -513,30 +562,39 @@ void nsexec(void)
* ready, so we can receive all possible error codes
* generated by children.
*/
while (ready < 2) {
while (!ready) {
enum sync_t s;
int ret;
/* This doesn't need to be global, we're in the parent. */
int syncfd = syncpipe[1];
syncfd = sync_child_pipe[1];
close(sync_child_pipe[0]);
if (read(syncfd, &s, sizeof(s)) != sizeof(s))
bail("failed to sync with child: next state");
switch (s) {
case SYNC_ERR: {
case SYNC_ERR:
/* We have to mirror the error code of the child. */
int ret;
if (read(syncfd, &ret, sizeof(ret)) != sizeof(ret))
bail("failed to sync with child: read(error code)");
exit(ret);
}
break;
case SYNC_USERMAP_PLS:
/* Enable setgroups(2) if we've been asked to. */
/*
* Enable setgroups(2) if we've been asked to. But we also
* have to explicitly disable setgroups(2) if we're
* creating a rootless container (this is required since
* Linux 3.19).
*/
if (config.is_rootless && config.is_setgroup) {
kill(child, SIGKILL);
bail("cannot allow setgroup in an unprivileged user namespace setup");
}
if (config.is_setgroup)
update_setgroups(child, SETGROUPS_ALLOW);
if (config.is_rootless)
update_setgroups(child, SETGROUPS_DENY);
/* Set up mappings. */
update_uidmap(child, config.uidmap, config.uidmap_len);
@ -548,11 +606,6 @@ void nsexec(void)
bail("failed to sync with child: write(SYNC_USERMAP_ACK)");
}
break;
case SYNC_USERMAP_ACK:
/* We should _never_ receive acks. */
kill(child, SIGKILL);
bail("failed to sync with child: unexpected SYNC_USERMAP_ACK");
break;
case SYNC_RECVPID_PLS: {
pid_t old = child;
@ -570,20 +623,46 @@ void nsexec(void)
bail("failed to sync with child: write(SYNC_RECVPID_ACK)");
}
}
ready++;
break;
case SYNC_RECVPID_ACK:
/* We should _never_ receive acks. */
kill(child, SIGKILL);
bail("failed to sync with child: unexpected SYNC_RECVPID_ACK");
break;
case SYNC_CHILD_READY:
ready++;
ready = true;
break;
default:
bail("unexpected sync value");
bail("unexpected sync value: %u", s);
}
}
/* Now sync with grandchild. */
ready = false;
while (!ready) {
enum sync_t s;
int ret;
syncfd = sync_grandchild_pipe[1];
close(sync_grandchild_pipe[0]);
s = SYNC_GRANDCHILD;
if (write(syncfd, &s, sizeof(s)) != sizeof(s)) {
kill(child, SIGKILL);
bail("failed to sync with child: write(SYNC_GRANDCHILD)");
}
if (read(syncfd, &s, sizeof(s)) != sizeof(s))
bail("failed to sync with child: next state");
switch (s) {
case SYNC_ERR:
/* We have to mirror the error code of the child. */
if (read(syncfd, &ret, sizeof(ret)) != sizeof(ret))
bail("failed to sync with child: read(error code)");
exit(ret);
case SYNC_CHILD_READY:
ready = true;
break;
default:
bail("unexpected sync value: %u", s);
}
}
@ -615,7 +694,8 @@ void nsexec(void)
enum sync_t s;
/* We're in a child and thus need to tell the parent if we die. */
syncfd = syncpipe[0];
syncfd = sync_child_pipe[0];
close(sync_child_pipe[1]);
/* For debugging. */
prctl(PR_SET_NAME, (unsigned long) "runc:[1:CHILD]", 0, 0, 0);
@ -653,6 +733,11 @@ void nsexec(void)
* clone_parent rant). So signal our parent to hook us up.
*/
/* Switching is only necessary if we joined namespaces. */
if (config.namespaces) {
if (prctl(PR_SET_DUMPABLE, 1, 0, 0, 0) < 0)
bail("failed to set process as dumpable");
}
s = SYNC_USERMAP_PLS;
if (write(syncfd, &s, sizeof(s)) != sizeof(s))
bail("failed to sync with parent: write(SYNC_USERMAP_PLS)");
@ -663,6 +748,11 @@ void nsexec(void)
bail("failed to sync with parent: read(SYNC_USERMAP_ACK)");
if (s != SYNC_USERMAP_ACK)
bail("failed to sync with parent: SYNC_USERMAP_ACK: got %u", s);
/* Switching is only necessary if we joined namespaces. */
if (config.namespaces) {
if (prctl(PR_SET_DUMPABLE, 0, 0, 0, 0) < 0)
bail("failed to set process as dumpable");
}
}
/*
@ -700,6 +790,12 @@ void nsexec(void)
bail("failed to sync with parent: SYNC_RECVPID_ACK: got %u", s);
}
s = SYNC_CHILD_READY;
if (write(syncfd, &s, sizeof(s)) != sizeof(s)) {
kill(child, SIGKILL);
bail("failed to sync with parent: write(SYNC_CHILD_READY)");
}
/* Our work is done. [Stage 2: JUMP_INIT] is doing the rest of the work. */
exit(0);
}
@ -718,11 +814,19 @@ void nsexec(void)
enum sync_t s;
/* We're in a child and thus need to tell the parent if we die. */
syncfd = syncpipe[0];
syncfd = sync_grandchild_pipe[0];
close(sync_grandchild_pipe[1]);
close(sync_child_pipe[0]);
close(sync_child_pipe[1]);
/* For debugging. */
prctl(PR_SET_NAME, (unsigned long) "runc:[2:INIT]", 0, 0, 0);
if (read(syncfd, &s, sizeof(s)) != sizeof(s))
bail("failed to sync with parent: read(SYNC_GRANDCHILD)");
if (s != SYNC_GRANDCHILD)
bail("failed to sync with parent: SYNC_GRANDCHILD: got %u", s);
if (setsid() < 0)
bail("setsid failed");
@ -732,16 +836,17 @@ void nsexec(void)
if (setgid(0) < 0)
bail("setgid failed");
if (!config.is_rootless && config.is_setgroup) {
if (setgroups(0, NULL) < 0)
bail("setgroups failed");
}
s = SYNC_CHILD_READY;
if (write(syncfd, &s, sizeof(s)) != sizeof(s))
bail("failed to sync with patent: write(SYNC_CHILD_READY)");
/* Close sync pipes. */
close(syncpipe[0]);
close(syncpipe[1]);
close(sync_grandchild_pipe[0]);
/* Free netlink data. */
nl_free(&config);
@ -751,7 +856,6 @@ void nsexec(void)
}
default:
bail("unexpected jump value");
break;
}
/* Should never be reached. */

148
vendor/github.com/opencontainers/runc/libcontainer/utils/cmsg.c generated vendored
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@ -1,148 +0,0 @@
/*
* Copyright 2016 SUSE LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include "cmsg.h"
#define error(fmt, ...) \
({ \
fprintf(stderr, "nsenter: " fmt ": %m\n", ##__VA_ARGS__); \
errno = ECOMM; \
goto err; /* return value */ \
})
/*
* Sends a file descriptor along the sockfd provided. Returns the return
* value of sendmsg(2). Any synchronisation and preparation of state
* should be done external to this (we expect the other side to be in
* recvfd() in the code).
*/
ssize_t sendfd(int sockfd, struct file_t file)
{
struct msghdr msg = {0};
struct iovec iov[1] = {0};
struct cmsghdr *cmsg;
int *fdptr;
int ret;
union {
char buf[CMSG_SPACE(sizeof(file.fd))];
struct cmsghdr align;
} u;
/*
* We need to send some other data along with the ancillary data,
* otherwise the other side won't recieve any data. This is very
* well-hidden in the documentation (and only applies to
* SOCK_STREAM). See the bottom part of unix(7).
*/
iov[0].iov_base = file.name;
iov[0].iov_len = strlen(file.name) + 1;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = iov;
msg.msg_iovlen = 1;
msg.msg_control = u.buf;
msg.msg_controllen = sizeof(u.buf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
fdptr = (int *) CMSG_DATA(cmsg);
memcpy(fdptr, &file.fd, sizeof(int));
return sendmsg(sockfd, &msg, 0);
}
/*
* Receives a file descriptor from the sockfd provided. Returns the file
* descriptor as sent from sendfd(). It will return the file descriptor
* or die (literally) trying. Any synchronisation and preparation of
* state should be done external to this (we expect the other side to be
* in sendfd() in the code).
*/
struct file_t recvfd(int sockfd)
{
struct msghdr msg = {0};
struct iovec iov[1] = {0};
struct cmsghdr *cmsg;
struct file_t file = {0};
int *fdptr;
int olderrno;
union {
char buf[CMSG_SPACE(sizeof(file.fd))];
struct cmsghdr align;
} u;
/* Allocate a buffer. */
/* TODO: Make this dynamic with MSG_PEEK. */
file.name = malloc(TAG_BUFFER);
if (!file.name)
error("recvfd: failed to allocate file.tag buffer\n");
/*
* We need to "recieve" the non-ancillary data even though we don't
* plan to use it at all. Otherwise, things won't work as expected.
* See unix(7) and other well-hidden documentation.
*/
iov[0].iov_base = file.name;
iov[0].iov_len = TAG_BUFFER;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = iov;
msg.msg_iovlen = 1;
msg.msg_control = u.buf;
msg.msg_controllen = sizeof(u.buf);
ssize_t ret = recvmsg(sockfd, &msg, 0);
if (ret < 0)
goto err;
cmsg = CMSG_FIRSTHDR(&msg);
if (!cmsg)
error("recvfd: got NULL from CMSG_FIRSTHDR");
if (cmsg->cmsg_level != SOL_SOCKET)
error("recvfd: expected SOL_SOCKET in cmsg: %d", cmsg->cmsg_level);
if (cmsg->cmsg_type != SCM_RIGHTS)
error("recvfd: expected SCM_RIGHTS in cmsg: %d", cmsg->cmsg_type);
if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
error("recvfd: expected correct CMSG_LEN in cmsg: %lu", cmsg->cmsg_len);
fdptr = (int *) CMSG_DATA(cmsg);
if (!fdptr || *fdptr < 0)
error("recvfd: recieved invalid pointer");
file.fd = *fdptr;
return file;
err:
olderrno = errno;
free(file.name);
errno = olderrno;
return (struct file_t){0};
}

76
vendor/github.com/opencontainers/runc/libcontainer/utils/cmsg.go generated vendored
View File

@ -3,7 +3,7 @@
package utils
/*
* Copyright 2016 SUSE LLC
* Copyright 2016, 2017 SUSE LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -18,28 +18,66 @@ package utils
* limitations under the License.
*/
/*
#include <errno.h>
#include <stdlib.h>
#include "cmsg.h"
*/
import "C"
import (
"fmt"
"os"
"unsafe"
"golang.org/x/sys/unix"
)
// MaxSendfdLen is the maximum length of the name of a file descriptor being
// sent using SendFd. The name of the file handle returned by RecvFd will never
// be larger than this value.
const MaxNameLen = 4096
// oobSpace is the size of the oob slice required to store a single FD. Note
// that unix.UnixRights appears to make the assumption that fd is always int32,
// so sizeof(fd) = 4.
var oobSpace = unix.CmsgSpace(4)
// RecvFd waits for a file descriptor to be sent over the given AF_UNIX
// socket. The file name of the remote file descriptor will be recreated
// locally (it is sent as non-auxiliary data in the same payload).
func RecvFd(socket *os.File) (*os.File, error) {
file, err := C.recvfd(C.int(socket.Fd()))
// For some reason, unix.Recvmsg uses the length rather than the capacity
// when passing the msg_controllen and other attributes to recvmsg. So we
// have to actually set the length.
name := make([]byte, MaxNameLen)
oob := make([]byte, oobSpace)
sockfd := socket.Fd()
n, oobn, _, _, err := unix.Recvmsg(int(sockfd), name, oob, 0)
if err != nil {
return nil, err
}
defer C.free(unsafe.Pointer(file.name))
return os.NewFile(uintptr(file.fd), C.GoString(file.name)), nil
if n >= MaxNameLen || oobn != oobSpace {
return nil, fmt.Errorf("recvfd: incorrect number of bytes read (n=%d oobn=%d)", n, oobn)
}
// Truncate.
name = name[:n]
oob = oob[:oobn]
scms, err := unix.ParseSocketControlMessage(oob)
if err != nil {
return nil, err
}
if len(scms) != 1 {
return nil, fmt.Errorf("recvfd: number of SCMs is not 1: %d", len(scms))
}
scm := scms[0]
fds, err := unix.ParseUnixRights(&scm)
if err != nil {
return nil, err
}
if len(fds) != 1 {
return nil, fmt.Errorf("recvfd: number of fds is not 1: %d", len(fds))
}
fd := uintptr(fds[0])
return os.NewFile(fd, string(name)), nil
}
// SendFd sends a file descriptor over the given AF_UNIX socket. In
@ -47,11 +85,11 @@ func RecvFd(socket *os.File) (*os.File, error) {
// non-auxiliary data in the same payload (allowing to send contextual
// information for a file descriptor).
func SendFd(socket, file *os.File) error {
var cfile C.struct_file_t
cfile.fd = C.int(file.Fd())
cfile.name = C.CString(file.Name())
defer C.free(unsafe.Pointer(cfile.name))
_, err := C.sendfd(C.int(socket.Fd()), cfile)
return err
name := []byte(file.Name())
if len(name) >= MaxNameLen {
return fmt.Errorf("sendfd: filename too long: %s", file.Name())
}
oob := unix.UnixRights(int(file.Fd()))
return unix.Sendmsg(int(socket.Fd()), name, oob, nil, 0)
}

36
vendor/github.com/opencontainers/runc/libcontainer/utils/cmsg.h generated vendored
View File

@ -1,36 +0,0 @@
/*
* Copyright 2016 SUSE LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#if !defined(CMSG_H)
#define CMSG_H
#include <sys/types.h>
/* TODO: Implement this properly with MSG_PEEK. */
#define TAG_BUFFER 4096
/* This mirrors Go's (*os.File). */
struct file_t {
char *name;
int fd;
};
struct file_t recvfd(int sockfd);
ssize_t sendfd(int sockfd, struct file_t file);
#endif /* !defined(CMSG_H) */

10
vendor/github.com/opencontainers/runc/libcontainer/utils/utils_unix.go generated vendored
View File

@ -4,6 +4,7 @@ package utils
import (
"io/ioutil"
"os"
"strconv"
"syscall"
)
@ -31,3 +32,12 @@ func CloseExecFrom(minFd int) error {
}
return nil
}
// NewSockPair returns a new unix socket pair
func NewSockPair(name string) (parent *os.File, child *os.File, err error) {
fds, err := syscall.Socketpair(syscall.AF_LOCAL, syscall.SOCK_STREAM|syscall.SOCK_CLOEXEC, 0)
if err != nil {
return nil, nil, err
}
return os.NewFile(uintptr(fds[1]), name+"-p"), os.NewFile(uintptr(fds[0]), name+"-c"), nil
}