/*
* return < 0 on transport error.
* *status is valid only if return >= 0
*/
static int v9fs_receive_status(V9fsProxy *proxy,
struct iovec *reply, int *status)
{
int retval;
ProxyHeader header;
*status = 0;
reply->iov_len = 0;
retval = socket_read(proxy->sockfd, reply->iov_base, PROXY_HDR_SZ);
if (retval < 0) {
return retval;
}
reply->iov_len = PROXY_HDR_SZ;
proxy_unmarshal(reply, 0, "dd", &header.type, &header.size);
if (header.size != sizeof(int)) {
*status = -ENOBUFS;
return 0;
}
retval = socket_read(proxy->sockfd,
reply->iov_base + PROXY_HDR_SZ, header.size);
if (retval < 0) {
return retval;
}
reply->iov_len += header.size;
proxy_unmarshal(reply, PROXY_HDR_SZ, "d", status);
return 0;
}
/*
* create other filesystem objects and send 0 on success
* return -errno on error
*/
static int do_create_others(int type, struct iovec *iovec)
{
dev_t rdev;
int retval = 0;
int offset = PROXY_HDR_SZ;
V9fsString oldpath, path;
int mode, uid, gid, cur_uid, cur_gid;
v9fs_string_init(&path);
v9fs_string_init(&oldpath);
cur_uid = geteuid();
cur_gid = getegid();
retval = proxy_unmarshal(iovec, offset, "dd", &uid, &gid);
if (retval < 0) {
return retval;
}
offset += retval;
retval = setfsugid(uid, gid);
if (retval < 0) {
retval = -errno;
goto err_out;
}
switch (type) {
case T_MKNOD:
retval = proxy_unmarshal(iovec, offset, "sdq", &path, &mode, &rdev);
if (retval < 0) {
goto err_out;
}
retval = mknod(path.data, mode, rdev);
break;
case T_MKDIR:
retval = proxy_unmarshal(iovec, offset, "sd", &path, &mode);
if (retval < 0) {
goto err_out;
}
retval = mkdir(path.data, mode);
break;
case T_SYMLINK:
retval = proxy_unmarshal(iovec, offset, "ss", &oldpath, &path);
if (retval < 0) {
goto err_out;
}
retval = symlink(oldpath.data, path.data);
break;
}
if (retval < 0) {
retval = -errno;
}
err_out:
v9fs_string_free(&path);
v9fs_string_free(&oldpath);
setfsugid(cur_uid, cur_gid);
return retval;
}
static int do_getxattr(int type, struct iovec *iovec, struct iovec *out_iovec)
{
int size = 0, offset, retval;
V9fsString path, name, xattr;
v9fs_string_init(&xattr);
v9fs_string_init(&path);
retval = proxy_unmarshal(iovec, PROXY_HDR_SZ, "ds", &size, &path);
if (retval < 0) {
return retval;
}
offset = PROXY_HDR_SZ + retval;
if (size) {
xattr.data = g_malloc(size);
xattr.size = size;
}
switch (type) {
case T_LGETXATTR:
v9fs_string_init(&name);
retval = proxy_unmarshal(iovec, offset, "s", &name);
if (retval > 0) {
retval = lgetxattr(path.data, name.data, xattr.data, size);
if (retval < 0) {
retval = -errno;
} else {
xattr.size = retval;
}
}
v9fs_string_free(&name);
break;
case T_LLISTXATTR:
retval = llistxattr(path.data, xattr.data, size);
if (retval < 0) {
retval = -errno;
} else {
xattr.size = retval;
}
break;
}
if (retval < 0) {
goto err_out;
}
if (!size) {
proxy_marshal(out_iovec, PROXY_HDR_SZ, "d", retval);
retval = sizeof(retval);
} else {
retval = proxy_marshal(out_iovec, PROXY_HDR_SZ, "s", &xattr);
}
err_out:
v9fs_string_free(&xattr);
v9fs_string_free(&path);
return retval;
}
/*
* create a file and send fd on success
* return -errno on error
*/
static int do_create(struct iovec *iovec)
{
int ret;
V9fsString path;
int flags, mode, uid, gid, cur_uid, cur_gid;
v9fs_string_init(&path);
ret = proxy_unmarshal(iovec, PROXY_HDR_SZ, "sdddd",
&path, &flags, &mode, &uid, &gid);
if (ret < 0) {
goto unmarshal_err_out;
}
ret = setugid(uid, gid, &cur_uid, &cur_gid);
if (ret < 0) {
goto unmarshal_err_out;
}
ret = open(path.data, flags, mode);
if (ret < 0) {
ret = -errno;
}
resetugid(cur_uid, cur_gid);
unmarshal_err_out:
v9fs_string_free(&path);
return ret;
}
static int do_readlink(struct iovec *iovec, struct iovec *out_iovec)
{
char *buffer;
int size, retval;
V9fsString target, path;
v9fs_string_init(&path);
retval = proxy_unmarshal(iovec, PROXY_HDR_SZ, "sd", &path, &size);
if (retval < 0) {
v9fs_string_free(&path);
return retval;
}
buffer = g_malloc(size);
v9fs_string_init(&target);
retval = readlink(path.data, buffer, size - 1);
if (retval > 0) {
buffer[retval] = '\0';
v9fs_string_sprintf(&target, "%s", buffer);
retval = proxy_marshal(out_iovec, PROXY_HDR_SZ, "s", &target);
} else {
retval = -errno;
}
g_free(buffer);
v9fs_string_free(&target);
v9fs_string_free(&path);
return retval;
}
static int read_request(int sockfd, struct iovec *iovec, ProxyHeader *header)
{
int retval;
/*
* read the request header.
*/
iovec->iov_len = 0;
retval = socket_read(sockfd, iovec->iov_base, PROXY_HDR_SZ);
if (retval < 0) {
return retval;
}
iovec->iov_len = PROXY_HDR_SZ;
retval = proxy_unmarshal(iovec, 0, "dd", &header->type, &header->size);
if (retval < 0) {
return retval;
}
/*
* We can't process message.size > PROXY_MAX_IO_SZ.
* Treat it as fatal error
*/
if (header->size > PROXY_MAX_IO_SZ) {
return -ENOBUFS;
}
retval = socket_read(sockfd, iovec->iov_base + PROXY_HDR_SZ, header->size);
if (retval < 0) {
return retval;
}
iovec->iov_len += header->size;
return 0;
}
/*
* create a file and send fd on success
* return -errno on error
*/
static int do_create(struct iovec *iovec)
{
int ret;
V9fsString path;
int flags, mode, uid, gid, cur_uid, cur_gid;
v9fs_string_init(&path);
ret = proxy_unmarshal(iovec, PROXY_HDR_SZ, "sdddd",
&path, &flags, &mode, &uid, &gid);
if (ret < 0) {
goto unmarshal_err_out;
}
cur_uid = geteuid();
cur_gid = getegid();
ret = setfsugid(uid, gid);
if (ret < 0) {
/*
* On failure reset back to the
* old uid/gid
*/
ret = -errno;
goto err_out;
}
ret = open(path.data, flags, mode);
if (ret < 0) {
LOGV("%s: Could not open file: %s", __func__, path.data);
ret = -errno;
}
err_out:
setfsugid(cur_uid, cur_gid);
unmarshal_err_out:
v9fs_string_free(&path);
return ret;
}
/*
* Gets stat/statfs information and packs in out_iovec structure
* on success returns number of bytes packed in out_iovec struture
* otherwise returns -errno
*/
static int do_stat(int type, struct iovec *iovec, struct iovec *out_iovec)
{
int retval;
V9fsString path;
ProxyStat pr_stat;
ProxyStatFS pr_stfs;
struct stat st_buf;
struct statfs stfs_buf;
v9fs_string_init(&path);
retval = proxy_unmarshal(iovec, PROXY_HDR_SZ, "s", &path);
if (retval < 0) {
return retval;
}
switch (type) {
case T_LSTAT:
retval = lstat(path.data, &st_buf);
if (retval < 0) {
retval = -errno;
} else {
stat_to_prstat(&pr_stat, &st_buf);
retval = proxy_marshal(out_iovec, PROXY_HDR_SZ,
"qqqdddqqqqqqqqqq", pr_stat.st_dev,
pr_stat.st_ino, pr_stat.st_nlink,
pr_stat.st_mode, pr_stat.st_uid,
pr_stat.st_gid, pr_stat.st_rdev,
pr_stat.st_size, pr_stat.st_blksize,
pr_stat.st_blocks,
pr_stat.st_atim_sec, pr_stat.st_atim_nsec,
pr_stat.st_mtim_sec, pr_stat.st_mtim_nsec,
pr_stat.st_ctim_sec, pr_stat.st_ctim_nsec);
}
break;
case T_STATFS:
retval = statfs(path.data, &stfs_buf);
if (retval < 0) {
retval = -errno;
} else {
statfs_to_prstatfs(&pr_stfs, &stfs_buf);
retval = proxy_marshal(out_iovec, PROXY_HDR_SZ,
"qqqqqqqqqqq", pr_stfs.f_type,
pr_stfs.f_bsize, pr_stfs.f_blocks,
pr_stfs.f_bfree, pr_stfs.f_bavail,
pr_stfs.f_files, pr_stfs.f_ffree,
pr_stfs.f_fsid[0], pr_stfs.f_fsid[1],
pr_stfs.f_namelen, pr_stfs.f_frsize);
}
break;
}
v9fs_string_free(&path);
return retval;
}
/*
* open a file and send fd on success
* return -errno on error
*/
static int do_open(struct iovec *iovec)
{
int flags, ret;
V9fsString path;
v9fs_string_init(&path);
ret = proxy_unmarshal(iovec, PROXY_HDR_SZ, "sd", &path, &flags);
if (ret < 0) {
goto err_out;
}
ret = open(path.data, flags);
if (ret < 0) {
ret = -errno;
}
err_out:
v9fs_string_free(&path);
return ret;
}
/*
* gets generation number
* returns -errno on failure and sizeof(generation number) on success
*/
static int do_getversion(struct iovec *iovec, struct iovec *out_iovec)
{
uint64_t version;
int retval = -ENOTTY;
#ifdef FS_IOC_GETVERSION
int fd;
V9fsString path;
#endif
/* no need to issue ioctl */
if (!get_version) {
version = 0;
retval = proxy_marshal(out_iovec, PROXY_HDR_SZ, "q", version);
return retval;
}
#ifdef FS_IOC_GETVERSION
retval = proxy_unmarshal(iovec, PROXY_HDR_SZ, "s", &path);
if (retval < 0) {
return retval;
}
fd = open(path.data, O_RDONLY);
if (fd < 0) {
retval = -errno;
goto err_out;
}
if (ioctl(fd, FS_IOC_GETVERSION, &version) < 0) {
retval = -errno;
} else {
retval = proxy_marshal(out_iovec, PROXY_HDR_SZ, "q", version);
}
close(fd);
err_out:
v9fs_string_free(&path);
#endif
return retval;
}
/*
* Response contains two parts
* {header, data}
* header.type == T_ERROR, data -> -errno
* header.type == T_SUCCESS, data -> response
* size of errno/response is given by header.size
* returns < 0, on transport error. response is
* valid only if status >= 0.
*/
static int v9fs_receive_response(V9fsProxy *proxy, int type,
int *status, void *response)
{
int retval;
ProxyHeader header;
struct iovec *reply = &proxy->in_iovec;
*status = 0;
reply->iov_len = 0;
retval = socket_read(proxy->sockfd, reply->iov_base, PROXY_HDR_SZ);
if (retval < 0) {
return retval;
}
reply->iov_len = PROXY_HDR_SZ;
proxy_unmarshal(reply, 0, "dd", &header.type, &header.size);
/*
* if response size > PROXY_MAX_IO_SZ, read the response but ignore it and
* return -ENOBUFS
*/
if (header.size > PROXY_MAX_IO_SZ) {
int count;
while (header.size > 0) {
count = MIN(PROXY_MAX_IO_SZ, header.size);
count = socket_read(proxy->sockfd, reply->iov_base, count);
if (count < 0) {
return count;
}
header.size -= count;
}
*status = -ENOBUFS;
return 0;
}
retval = socket_read(proxy->sockfd,
reply->iov_base + PROXY_HDR_SZ, header.size);
if (retval < 0) {
return retval;
}
reply->iov_len += header.size;
/* there was an error during processing request */
if (header.type == T_ERROR) {
int ret;
ret = proxy_unmarshal(reply, PROXY_HDR_SZ, "d", status);
if (ret < 0) {
*status = ret;
}
return 0;
}
switch (type) {
case T_LSTAT: {
ProxyStat prstat;
retval = proxy_unmarshal(reply, PROXY_HDR_SZ,
"qqqdddqqqqqqqqqq", &prstat.st_dev,
&prstat.st_ino, &prstat.st_nlink,
&prstat.st_mode, &prstat.st_uid,
&prstat.st_gid, &prstat.st_rdev,
&prstat.st_size, &prstat.st_blksize,
&prstat.st_blocks,
&prstat.st_atim_sec, &prstat.st_atim_nsec,
&prstat.st_mtim_sec, &prstat.st_mtim_nsec,
&prstat.st_ctim_sec, &prstat.st_ctim_nsec);
prstat_to_stat(response, &prstat);
break;
}
case T_STATFS: {
ProxyStatFS prstfs;
retval = proxy_unmarshal(reply, PROXY_HDR_SZ,
"qqqqqqqqqqq", &prstfs.f_type,
&prstfs.f_bsize, &prstfs.f_blocks,
&prstfs.f_bfree, &prstfs.f_bavail,
&prstfs.f_files, &prstfs.f_ffree,
&prstfs.f_fsid[0], &prstfs.f_fsid[1],
&prstfs.f_namelen, &prstfs.f_frsize);
prstatfs_to_statfs(response, &prstfs);
break;
}
case T_READLINK: {
V9fsString target;
v9fs_string_init(&target);
retval = proxy_unmarshal(reply, PROXY_HDR_SZ, "s", &target);
strcpy(response, target.data);
v9fs_string_free(&target);
break;
}
case T_LGETXATTR:
case T_LLISTXATTR: {
V9fsString xattr;
v9fs_string_init(&xattr);
retval = proxy_unmarshal(reply, PROXY_HDR_SZ, "s", &xattr);
memcpy(response, xattr.data, xattr.size);
v9fs_string_free(&xattr);
break;
}
case T_GETVERSION:
proxy_unmarshal(reply, PROXY_HDR_SZ, "q", response);
break;
default:
return -1;
}
if (retval < 0) {
*status = retval;
}
return 0;
}
static int process_requests(int sock)
{
int flags;
int size = 0;
int retval = 0;
uint64_t offset;
ProxyHeader header;
int mode, uid, gid;
V9fsString name, value;
struct timespec spec[2];
V9fsString oldpath, path;
struct iovec in_iovec, out_iovec;
in_iovec.iov_base = g_malloc(PROXY_MAX_IO_SZ + PROXY_HDR_SZ);
in_iovec.iov_len = PROXY_MAX_IO_SZ + PROXY_HDR_SZ;
out_iovec.iov_base = g_malloc(PROXY_MAX_IO_SZ + PROXY_HDR_SZ);
out_iovec.iov_len = PROXY_MAX_IO_SZ + PROXY_HDR_SZ;
while (1) {
/*
* initialize the header type, so that we send
* response to proper request type.
*/
header.type = 0;
retval = read_request(sock, &in_iovec, &header);
if (retval < 0) {
goto err_out;
}
switch (header.type) {
case T_OPEN:
retval = do_open(&in_iovec);
break;
case T_CREATE:
retval = do_create(&in_iovec);
break;
case T_MKNOD:
case T_MKDIR:
case T_SYMLINK:
retval = do_create_others(header.type, &in_iovec);
break;
case T_LINK:
v9fs_string_init(&path);
v9fs_string_init(&oldpath);
retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ,
"ss", &oldpath, &path);
if (retval > 0) {
retval = link(oldpath.data, path.data);
if (retval < 0) {
retval = -errno;
}
}
v9fs_string_free(&oldpath);
v9fs_string_free(&path);
break;
case T_LSTAT:
case T_STATFS:
retval = do_stat(header.type, &in_iovec, &out_iovec);
break;
case T_READLINK:
retval = do_readlink(&in_iovec, &out_iovec);
break;
case T_CHMOD:
v9fs_string_init(&path);
retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ,
"sd", &path, &mode);
if (retval > 0) {
retval = chmod(path.data, mode);
if (retval < 0) {
retval = -errno;
}
}
v9fs_string_free(&path);
break;
case T_CHOWN:
v9fs_string_init(&path);
retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ, "sdd", &path,
&uid, &gid);
if (retval > 0) {
retval = lchown(path.data, uid, gid);
if (retval < 0) {
retval = -errno;
}
}
v9fs_string_free(&path);
break;
case T_TRUNCATE:
v9fs_string_init(&path);
retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ, "sq",
&path, &offset);
if (retval > 0) {
retval = truncate(path.data, offset);
if (retval < 0) {
retval = -errno;
}
}
v9fs_string_free(&path);
break;
case T_UTIME:
v9fs_string_init(&path);
retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ, "sqqqq", &path,
&spec[0].tv_sec, &spec[0].tv_nsec,
&spec[1].tv_sec, &spec[1].tv_nsec);
if (retval > 0) {
retval = utimensat(AT_FDCWD, path.data, spec,
AT_SYMLINK_NOFOLLOW);
if (retval < 0) {
retval = -errno;
}
}
v9fs_string_free(&path);
break;
case T_RENAME:
v9fs_string_init(&path);
v9fs_string_init(&oldpath);
retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ,
"ss", &oldpath, &path);
if (retval > 0) {
retval = rename(oldpath.data, path.data);
if (retval < 0) {
retval = -errno;
}
}
v9fs_string_free(&oldpath);
v9fs_string_free(&path);
break;
case T_REMOVE:
v9fs_string_init(&path);
retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ, "s", &path);
if (retval > 0) {
retval = remove(path.data);
if (retval < 0) {
retval = -errno;
}
}
v9fs_string_free(&path);
break;
case T_LGETXATTR:
case T_LLISTXATTR:
retval = do_getxattr(header.type, &in_iovec, &out_iovec);
break;
case T_LSETXATTR:
v9fs_string_init(&path);
v9fs_string_init(&name);
v9fs_string_init(&value);
retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ, "sssdd", &path,
&name, &value, &size, &flags);
if (retval > 0) {
retval = lsetxattr(path.data,
name.data, value.data, size, flags);
if (retval < 0) {
retval = -errno;
}
}
v9fs_string_free(&path);
v9fs_string_free(&name);
v9fs_string_free(&value);
break;
case T_LREMOVEXATTR:
v9fs_string_init(&path);
v9fs_string_init(&name);
retval = proxy_unmarshal(&in_iovec,
PROXY_HDR_SZ, "ss", &path, &name);
if (retval > 0) {
retval = lremovexattr(path.data, name.data);
if (retval < 0) {
retval = -errno;
}
}
v9fs_string_free(&path);
v9fs_string_free(&name);
break;
case T_GETVERSION:
retval = do_getversion(&in_iovec, &out_iovec);
break;
default:
goto err_out;
break;
}
if (process_reply(sock, header.type, &out_iovec, retval) < 0) {
goto err_out;
}
}
err_out:
g_free(in_iovec.iov_base);
g_free(out_iovec.iov_base);
return -1;
}
