qemu/hw/virtio-9p-local.c

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/*
* Virtio 9p Posix callback
*
* Copyright IBM, Corp. 2010
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include "virtio.h"
#include "virtio-9p.h"
#include <arpa/inet.h>
#include <pwd.h>
#include <grp.h>
#include <sys/socket.h>
#include <sys/un.h>
static const char *rpath(FsContext *ctx, const char *path)
{
/* FIXME: so wrong... */
static char buffer[4096];
snprintf(buffer, sizeof(buffer), "%s/%s", ctx->fs_root, path);
return buffer;
}
static int local_lstat(FsContext *ctx, const char *path, struct stat *stbuf)
{
return lstat(rpath(ctx, path), stbuf);
}
static int local_setuid(FsContext *ctx, uid_t uid)
{
struct passwd *pw;
gid_t groups[33];
int ngroups;
static uid_t cur_uid = -1;
if (cur_uid == uid) {
return 0;
}
if (setreuid(0, 0)) {
return -1;
}
pw = getpwuid(uid);
if (pw == NULL) {
return -1;
}
ngroups = 33;
if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups) == -1) {
return -1;
}
if (setgroups(ngroups, groups)) {
return -1;
}
if (setregid(-1, pw->pw_gid)) {
return -1;
}
if (setreuid(-1, uid)) {
return -1;
}
cur_uid = uid;
return 0;
}
static ssize_t local_readlink(FsContext *ctx, const char *path,
char *buf, size_t bufsz)
{
return readlink(rpath(ctx, path), buf, bufsz);
}
static int local_close(FsContext *ctx, int fd)
{
return close(fd);
}
static int local_closedir(FsContext *ctx, DIR *dir)
{
return closedir(dir);
}
static int local_open(FsContext *ctx, const char *path, int flags)
{
return open(rpath(ctx, path), flags);
}
static DIR *local_opendir(FsContext *ctx, const char *path)
{
return opendir(rpath(ctx, path));
}
static void local_rewinddir(FsContext *ctx, DIR *dir)
{
return rewinddir(dir);
}
static off_t local_telldir(FsContext *ctx, DIR *dir)
{
return telldir(dir);
}
static struct dirent *local_readdir(FsContext *ctx, DIR *dir)
{
return readdir(dir);
}
static void local_seekdir(FsContext *ctx, DIR *dir, off_t off)
{
return seekdir(dir, off);
}
static ssize_t local_readv(FsContext *ctx, int fd, const struct iovec *iov,
int iovcnt)
{
return readv(fd, iov, iovcnt);
}
static off_t local_lseek(FsContext *ctx, int fd, off_t offset, int whence)
{
return lseek(fd, offset, whence);
}
static ssize_t local_writev(FsContext *ctx, int fd, const struct iovec *iov,
int iovcnt)
{
return writev(fd, iov, iovcnt);
}
static int local_chmod(FsContext *ctx, const char *path, mode_t mode)
{
return chmod(rpath(ctx, path), mode);
}
static int local_mknod(FsContext *ctx, const char *path, mode_t mode, dev_t dev)
{
return mknod(rpath(ctx, path), mode, dev);
}
static int local_mksock(FsContext *ctx2, const char *path)
{
struct sockaddr_un addr;
int s;
addr.sun_family = AF_UNIX;
snprintf(addr.sun_path, 108, "%s", rpath(ctx2, path));
s = socket(PF_UNIX, SOCK_STREAM, 0);
if (s == -1) {
return -1;
}
if (bind(s, (struct sockaddr *)&addr, sizeof(addr))) {
close(s);
return -1;
}
close(s);
return 0;
}
static int local_mkdir(FsContext *ctx, const char *path, mode_t mode)
{
return mkdir(rpath(ctx, path), mode);
}
static int local_fstat(FsContext *ctx, int fd, struct stat *stbuf)
{
return fstat(fd, stbuf);
}
static int local_open2(FsContext *ctx, const char *path, int flags, mode_t mode)
{
return open(rpath(ctx, path), flags, mode);
}
static int local_symlink(FsContext *ctx, const char *oldpath,
const char *newpath)
{
return symlink(oldpath, rpath(ctx, newpath));
}
static int local_link(FsContext *ctx, const char *oldpath, const char *newpath)
{
char *tmp = qemu_strdup(rpath(ctx, oldpath));
int err, serrno = 0;
if (tmp == NULL) {
return -ENOMEM;
}
err = link(tmp, rpath(ctx, newpath));
if (err == -1) {
serrno = errno;
}
qemu_free(tmp);
if (err == -1) {
errno = serrno;
}
return err;
}
static int local_truncate(FsContext *ctx, const char *path, off_t size)
{
return truncate(rpath(ctx, path), size);
}
static int local_rename(FsContext *ctx, const char *oldpath,
const char *newpath)
{
char *tmp;
int err;
tmp = qemu_strdup(rpath(ctx, oldpath));
if (tmp == NULL) {
return -1;
}
err = rename(tmp, rpath(ctx, newpath));
if (err == -1) {
int serrno = errno;
qemu_free(tmp);
errno = serrno;
} else {
qemu_free(tmp);
}
return err;
}
static int local_chown(FsContext *ctx, const char *path, uid_t uid, gid_t gid)
{
return chown(rpath(ctx, path), uid, gid);
}
static int local_utime(FsContext *ctx, const char *path,
const struct utimbuf *buf)
{
return utime(rpath(ctx, path), buf);
}
static int local_remove(FsContext *ctx, const char *path)
{
return remove(rpath(ctx, path));
}
static int local_fsync(FsContext *ctx, int fd)
{
return fsync(fd);
}
FileOperations local_ops = {
.lstat = local_lstat,
.setuid = local_setuid,
.readlink = local_readlink,
.close = local_close,
.closedir = local_closedir,
.open = local_open,
.opendir = local_opendir,
.rewinddir = local_rewinddir,
.telldir = local_telldir,
.readdir = local_readdir,
.seekdir = local_seekdir,
.readv = local_readv,
.lseek = local_lseek,
.writev = local_writev,
.chmod = local_chmod,
.mknod = local_mknod,
.mksock = local_mksock,
.mkdir = local_mkdir,
.fstat = local_fstat,
.open2 = local_open2,
.symlink = local_symlink,
.link = local_link,
.truncate = local_truncate,
.rename = local_rename,
.chown = local_chown,
.utime = local_utime,
.remove = local_remove,
.fsync = local_fsync,
};