Archipelago » qemu

/*

 * 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_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,

    .fsync = local_fsync,

};