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namespace-util: introduce pidref_namespace_open()

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This commit is contained in:
Mike Yuan 2024-07-22 20:11:54 +02:00
parent 30957ced45
commit 86a3c1fd95
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GPG Key ID: 417471C0A40F58B3
2 changed files with 38 additions and 8 deletions
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37
src/basic/namespace-util.c
View File

@ -42,8 +42,8 @@ static NamespaceType clone_flag_to_namespace_type(unsigned long clone_flag) {
return _NAMESPACE_TYPE_INVALID;
}
int namespace_open(
pid_t pid,
int pidref_namespace_open(
const PidRef *pidref,
int *ret_pidns_fd,
int *ret_mntns_fd,
int *ret_netns_fd,
@ -52,13 +52,14 @@ int namespace_open(
_cleanup_close_ int pidns_fd = -EBADF, mntns_fd = -EBADF, netns_fd = -EBADF,
userns_fd = -EBADF, root_fd = -EBADF;
int r;
assert(pid >= 0);
assert(pidref_is_set(pidref));
if (ret_pidns_fd) {
const char *pidns;
pidns = pid_namespace_path(pid, NAMESPACE_PID);
pidns = pid_namespace_path(pidref->pid, NAMESPACE_PID);
pidns_fd = open(pidns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (pidns_fd < 0)
return -errno;
@ -67,7 +68,7 @@ int namespace_open(
if (ret_mntns_fd) {
const char *mntns;
mntns = pid_namespace_path(pid, NAMESPACE_MOUNT);
mntns = pid_namespace_path(pidref->pid, NAMESPACE_MOUNT);
mntns_fd = open(mntns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (mntns_fd < 0)
return -errno;
@ -76,7 +77,7 @@ int namespace_open(
if (ret_netns_fd) {
const char *netns;
netns = pid_namespace_path(pid, NAMESPACE_NET);
netns = pid_namespace_path(pidref->pid, NAMESPACE_NET);
netns_fd = open(netns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (netns_fd < 0)
return -errno;
@ -85,7 +86,7 @@ int namespace_open(
if (ret_userns_fd) {
const char *userns;
userns = pid_namespace_path(pid, NAMESPACE_USER);
userns = pid_namespace_path(pidref->pid, NAMESPACE_USER);
userns_fd = open(userns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (userns_fd < 0 && errno != ENOENT)
return -errno;
@ -94,12 +95,16 @@ int namespace_open(
if (ret_root_fd) {
const char *root;
root = procfs_file_alloca(pid, "root");
root = procfs_file_alloca(pidref->pid, "root");
root_fd = open(root, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
if (root_fd < 0)
return -errno;
}
r = pidref_verify(pidref);
if (r < 0)
return r;
if (ret_pidns_fd)
*ret_pidns_fd = TAKE_FD(pidns_fd);
@ -118,6 +123,22 @@ int namespace_open(
return 0;
}
int namespace_open(
pid_t pid,
int *ret_pidns_fd,
int *ret_mntns_fd,
int *ret_netns_fd,
int *ret_userns_fd,
int *ret_root_fd) {
assert(pid >= 0);
if (pid == 0)
pid = getpid_cached();
return pidref_namespace_open(&PIDREF_MAKE_FROM_PID(pid), ret_pidns_fd, ret_mntns_fd, ret_netns_fd, ret_userns_fd, ret_root_fd);
}
int namespace_enter(int pidns_fd, int mntns_fd, int netns_fd, int userns_fd, int root_fd) {
int r;

9
src/basic/namespace-util.h
View File

@ -3,6 +3,8 @@
#include <sys/types.h>
#include "pidref.h"
typedef enum NamespaceType {
NAMESPACE_CGROUP,
NAMESPACE_IPC,
@ -22,6 +24,13 @@ extern const struct namespace_info {
unsigned int clone_flag;
} namespace_info[_NAMESPACE_TYPE_MAX + 1];
int pidref_namespace_open(
const PidRef *pidref,
int *ret_pidns_fd,
int *ret_mntns_fd,
int *ret_netns_fd,
int *ret_userns_fd,
int *ret_root_fd);
int namespace_open(
pid_t pid,
int *ret_pidns_fd,