/
fd_table.c
516 lines (433 loc) · 18.1 KB
/
fd_table.c
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#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#ifndef _WIN32
# include <sys/types.h>
#endif /* _WIN32 */
#include "uv.h"
#include "fd_table.h"
#include "wasi_types.h"
#include "uv_mapping.h"
#include "uvwasi_alloc.h"
#define UVWASI__RIGHTS_ALL (UVWASI_RIGHT_FD_DATASYNC | \
UVWASI_RIGHT_FD_READ | \
UVWASI_RIGHT_FD_SEEK | \
UVWASI_RIGHT_FD_FDSTAT_SET_FLAGS | \
UVWASI_RIGHT_FD_SYNC | \
UVWASI_RIGHT_FD_TELL | \
UVWASI_RIGHT_FD_WRITE | \
UVWASI_RIGHT_FD_ADVISE | \
UVWASI_RIGHT_FD_ALLOCATE | \
UVWASI_RIGHT_PATH_CREATE_DIRECTORY | \
UVWASI_RIGHT_PATH_CREATE_FILE | \
UVWASI_RIGHT_PATH_LINK_SOURCE | \
UVWASI_RIGHT_PATH_LINK_TARGET | \
UVWASI_RIGHT_PATH_OPEN | \
UVWASI_RIGHT_FD_READDIR | \
UVWASI_RIGHT_PATH_READLINK | \
UVWASI_RIGHT_PATH_RENAME_SOURCE | \
UVWASI_RIGHT_PATH_RENAME_TARGET | \
UVWASI_RIGHT_PATH_FILESTAT_GET | \
UVWASI_RIGHT_PATH_FILESTAT_SET_SIZE | \
UVWASI_RIGHT_PATH_FILESTAT_SET_TIMES | \
UVWASI_RIGHT_FD_FILESTAT_GET | \
UVWASI_RIGHT_FD_FILESTAT_SET_TIMES | \
UVWASI_RIGHT_FD_FILESTAT_SET_SIZE | \
UVWASI_RIGHT_PATH_SYMLINK | \
UVWASI_RIGHT_PATH_UNLINK_FILE | \
UVWASI_RIGHT_PATH_REMOVE_DIRECTORY | \
UVWASI_RIGHT_POLL_FD_READWRITE | \
UVWASI_RIGHT_SOCK_SHUTDOWN)
#define UVWASI__RIGHTS_BLOCK_DEVICE_BASE UVWASI__RIGHTS_ALL
#define UVWASI__RIGHTS_BLOCK_DEVICE_INHERITING UVWASI__RIGHTS_ALL
#define UVWASI__RIGHTS_CHARACTER_DEVICE_BASE UVWASI__RIGHTS_ALL
#define UVWASI__RIGHTS_CHARACTER_DEVICE_INHERITING UVWASI__RIGHTS_ALL
#define UVWASI__RIGHTS_REGULAR_FILE_BASE (UVWASI_RIGHT_FD_DATASYNC | \
UVWASI_RIGHT_FD_READ | \
UVWASI_RIGHT_FD_SEEK | \
UVWASI_RIGHT_FD_FDSTAT_SET_FLAGS | \
UVWASI_RIGHT_FD_SYNC | \
UVWASI_RIGHT_FD_TELL | \
UVWASI_RIGHT_FD_WRITE | \
UVWASI_RIGHT_FD_ADVISE | \
UVWASI_RIGHT_FD_ALLOCATE | \
UVWASI_RIGHT_FD_FILESTAT_GET | \
UVWASI_RIGHT_FD_FILESTAT_SET_SIZE | \
UVWASI_RIGHT_FD_FILESTAT_SET_TIMES |\
UVWASI_RIGHT_POLL_FD_READWRITE)
#define UVWASI__RIGHTS_REGULAR_FILE_INHERITING 0
#define UVWASI__RIGHTS_DIRECTORY_BASE (UVWASI_RIGHT_FD_FDSTAT_SET_FLAGS | \
UVWASI_RIGHT_FD_SYNC | \
UVWASI_RIGHT_FD_ADVISE | \
UVWASI_RIGHT_PATH_CREATE_DIRECTORY | \
UVWASI_RIGHT_PATH_CREATE_FILE | \
UVWASI_RIGHT_PATH_LINK_SOURCE | \
UVWASI_RIGHT_PATH_LINK_TARGET | \
UVWASI_RIGHT_PATH_OPEN | \
UVWASI_RIGHT_FD_READDIR | \
UVWASI_RIGHT_PATH_READLINK | \
UVWASI_RIGHT_PATH_RENAME_SOURCE | \
UVWASI_RIGHT_PATH_RENAME_TARGET | \
UVWASI_RIGHT_PATH_FILESTAT_GET | \
UVWASI_RIGHT_PATH_FILESTAT_SET_SIZE | \
UVWASI_RIGHT_PATH_FILESTAT_SET_TIMES | \
UVWASI_RIGHT_FD_FILESTAT_GET | \
UVWASI_RIGHT_FD_FILESTAT_SET_TIMES | \
UVWASI_RIGHT_PATH_SYMLINK | \
UVWASI_RIGHT_PATH_UNLINK_FILE | \
UVWASI_RIGHT_PATH_REMOVE_DIRECTORY | \
UVWASI_RIGHT_POLL_FD_READWRITE)
#define UVWASI__RIGHTS_DIRECTORY_INHERITING (UVWASI__RIGHTS_DIRECTORY_BASE | \
UVWASI__RIGHTS_REGULAR_FILE_BASE)
#define UVWASI__RIGHTS_SOCKET_BASE (UVWASI_RIGHT_FD_READ | \
UVWASI_RIGHT_FD_FDSTAT_SET_FLAGS | \
UVWASI_RIGHT_FD_WRITE | \
UVWASI_RIGHT_FD_FILESTAT_GET | \
UVWASI_RIGHT_POLL_FD_READWRITE | \
UVWASI_RIGHT_SOCK_SHUTDOWN)
#define UVWASI__RIGHTS_SOCKET_INHERITING UVWASI__RIGHTS_ALL;
#define UVWASI__RIGHTS_TTY_BASE (UVWASI_RIGHT_FD_READ | \
UVWASI_RIGHT_FD_FDSTAT_SET_FLAGS | \
UVWASI_RIGHT_FD_WRITE | \
UVWASI_RIGHT_FD_FILESTAT_GET | \
UVWASI_RIGHT_POLL_FD_READWRITE)
#define UVWASI__RIGHTS_TTY_INHERITING 0
static uvwasi_errno_t uvwasi__get_type_and_rights(uv_file fd,
int flags,
uvwasi_filetype_t* type,
uvwasi_rights_t* rights_base,
uvwasi_rights_t* rights_inheriting) {
uv_fs_t req;
uvwasi_filetype_t filetype;
int read_or_write_only;
int r;
r = uv_fs_fstat(NULL, &req, fd, NULL);
filetype = uvwasi__stat_to_filetype(&req.statbuf);
uv_fs_req_cleanup(&req);
if (r != 0)
return uvwasi__translate_uv_error(r);
*type = filetype;
switch (filetype) {
case UVWASI_FILETYPE_REGULAR_FILE:
*rights_base = UVWASI__RIGHTS_REGULAR_FILE_BASE;
*rights_inheriting = UVWASI__RIGHTS_REGULAR_FILE_INHERITING;
break;
case UVWASI_FILETYPE_DIRECTORY:
*rights_base = UVWASI__RIGHTS_DIRECTORY_BASE;
*rights_inheriting = UVWASI__RIGHTS_DIRECTORY_INHERITING;
break;
/* uvwasi__stat_to_filetype() cannot differentiate socket types. It only
returns UVWASI_FILETYPE_SOCKET_STREAM. */
case UVWASI_FILETYPE_SOCKET_STREAM:
if (uv_guess_handle(fd) == UV_UDP)
*type = UVWASI_FILETYPE_SOCKET_DGRAM;
*rights_base = UVWASI__RIGHTS_SOCKET_BASE;
*rights_inheriting = UVWASI__RIGHTS_SOCKET_INHERITING;
break;
case UVWASI_FILETYPE_CHARACTER_DEVICE:
if (uv_guess_handle(fd) == UV_TTY) {
*rights_base = UVWASI__RIGHTS_TTY_BASE;
*rights_inheriting = UVWASI__RIGHTS_TTY_INHERITING;
} else {
*rights_base = UVWASI__RIGHTS_CHARACTER_DEVICE_BASE;
*rights_inheriting = UVWASI__RIGHTS_CHARACTER_DEVICE_INHERITING;
}
break;
case UVWASI_FILETYPE_BLOCK_DEVICE:
*rights_base = UVWASI__RIGHTS_BLOCK_DEVICE_BASE;
*rights_inheriting = UVWASI__RIGHTS_BLOCK_DEVICE_INHERITING;
break;
default:
*rights_base = 0;
*rights_inheriting = 0;
}
if (*type == UVWASI_FILETYPE_UNKNOWN)
return UVWASI_EINVAL;
/* Disable read/write bits depending on access mode. */
read_or_write_only = flags & (UV_FS_O_RDONLY | UV_FS_O_WRONLY | UV_FS_O_RDWR);
if (read_or_write_only == UV_FS_O_RDONLY)
*rights_base &= ~UVWASI_RIGHT_FD_WRITE;
else if (read_or_write_only == UV_FS_O_WRONLY)
*rights_base &= ~UVWASI_RIGHT_FD_READ;
return UVWASI_ESUCCESS;
}
static uvwasi_errno_t uvwasi__fd_table_insert(uvwasi_t* uvwasi,
struct uvwasi_fd_table_t* table,
uv_file fd,
const char* mapped_path,
const char* real_path,
uvwasi_filetype_t type,
uvwasi_rights_t rights_base,
uvwasi_rights_t rights_inheriting,
int preopen,
struct uvwasi_fd_wrap_t** wrap) {
struct uvwasi_fd_wrap_t* entry;
struct uvwasi_fd_wrap_t** new_fds;
uvwasi_errno_t err;
uint32_t new_size;
int index;
uint32_t i;
int r;
size_t mp_len;
char* mp_copy;
size_t rp_len;
char* rp_copy;
mp_len = strlen(mapped_path);
rp_len = strlen(real_path);
entry = (struct uvwasi_fd_wrap_t*)
uvwasi__malloc(uvwasi, sizeof(*entry) + mp_len + rp_len + 2);
if (entry == NULL) return UVWASI_ENOMEM;
mp_copy = (char*)(entry + 1);
rp_copy = mp_copy + mp_len + 1;
memcpy(mp_copy, mapped_path, mp_len);
mp_copy[mp_len] = '\0';
memcpy(rp_copy, real_path, rp_len);
rp_copy[rp_len] = '\0';
uv_rwlock_wrlock(&table->rwlock);
/* Check that there is room for a new item. If there isn't, grow the table. */
if (table->used >= table->size) {
new_size = table->size * 2;
new_fds = uvwasi__realloc(uvwasi, table->fds, new_size * sizeof(*new_fds));
if (new_fds == NULL) {
uvwasi__free(uvwasi, entry);
err = UVWASI_ENOMEM;
goto exit;
}
for (i = table->size; i < new_size; ++i)
new_fds[i] = NULL;
index = table->size;
table->fds = new_fds;
table->size = new_size;
} else {
/* The table is big enough, so find an empty slot for the new data. */
index = -1;
for (i = 0; i < table->size; ++i) {
if (table->fds[i] == NULL) {
index = i;
break;
}
}
/* index should never be -1. */
if (index == -1) {
uvwasi__free(uvwasi, entry);
err = UVWASI_ENOSPC;
goto exit;
}
}
table->fds[index] = entry;
r = uv_mutex_init(&entry->mutex);
if (r != 0) {
err = uvwasi__translate_uv_error(r);
goto exit;
}
entry->id = index;
entry->fd = fd;
entry->path = mp_copy;
entry->real_path = rp_copy;
entry->type = type;
entry->rights_base = rights_base;
entry->rights_inheriting = rights_inheriting;
entry->preopen = preopen;
table->used++;
if (wrap != NULL)
*wrap = entry;
err = UVWASI_ESUCCESS;
exit:
uv_rwlock_wrunlock(&table->rwlock);
return err;
}
uvwasi_errno_t uvwasi_fd_table_init(uvwasi_t* uvwasi,
struct uvwasi_fd_table_t* table,
uint32_t init_size) {
struct uvwasi_fd_wrap_t* wrap;
uvwasi_filetype_t type;
uvwasi_rights_t base;
uvwasi_rights_t inheriting;
uvwasi_errno_t err;
uvwasi_fd_t i;
int r;
/* Require an initial size of at least three to store the stdio FDs. */
if (table == NULL || init_size < 3)
return UVWASI_EINVAL;
table->fds = NULL;
r = uv_rwlock_init(&table->rwlock);
if (r != 0)
return uvwasi__translate_uv_error(r);
table->used = 0;
table->size = init_size;
table->fds = uvwasi__calloc(uvwasi,
init_size,
sizeof(struct uvwasi_fd_wrap_t*));
if (table->fds == NULL) {
err = UVWASI_ENOMEM;
goto error_exit;
}
/* Create the stdio FDs. */
for (i = 0; i < 3; ++i) {
err = uvwasi__get_type_and_rights(i,
UV_FS_O_RDWR,
&type,
&base,
&inheriting);
if (err != UVWASI_ESUCCESS)
goto error_exit;
err = uvwasi__fd_table_insert(uvwasi,
table,
i,
"",
"",
type,
base,
inheriting,
0,
&wrap);
if (err != UVWASI_ESUCCESS)
goto error_exit;
if (wrap->id != i || wrap->id != (uvwasi_fd_t) wrap->fd) {
err = UVWASI_EBADF;
goto error_exit;
}
}
return UVWASI_ESUCCESS;
error_exit:
uvwasi_fd_table_free(uvwasi, table);
return err;
}
void uvwasi_fd_table_free(uvwasi_t* uvwasi, struct uvwasi_fd_table_t* table) {
struct uvwasi_fd_wrap_t* entry;
uint32_t i;
if (table == NULL)
return;
for (i = 0; i < table->size; i++) {
entry = table->fds[i];
if (entry == NULL) continue;
uv_mutex_destroy(&entry->mutex);
uvwasi__free(uvwasi, entry);
}
uvwasi__free(uvwasi, table->fds);
table->fds = NULL;
table->size = 0;
table->used = 0;
uv_rwlock_destroy(&table->rwlock);
}
uvwasi_errno_t uvwasi_fd_table_insert_preopen(uvwasi_t* uvwasi,
struct uvwasi_fd_table_t* table,
const uv_file fd,
const char* path,
const char* real_path) {
uvwasi_filetype_t type;
uvwasi_rights_t base;
uvwasi_rights_t inheriting;
uvwasi_errno_t err;
if (table == NULL || path == NULL || real_path == NULL)
return UVWASI_EINVAL;
err = uvwasi__get_type_and_rights(fd, 0, &type, &base, &inheriting);
if (err != UVWASI_ESUCCESS)
return err;
if (type != UVWASI_FILETYPE_DIRECTORY)
return UVWASI_ENOTDIR;
err = uvwasi__fd_table_insert(uvwasi,
table,
fd,
path,
real_path,
UVWASI_FILETYPE_DIRECTORY,
UVWASI__RIGHTS_DIRECTORY_BASE,
UVWASI__RIGHTS_DIRECTORY_INHERITING,
1,
NULL);
if (err != UVWASI_ESUCCESS)
return err;
return UVWASI_ESUCCESS;
}
uvwasi_errno_t uvwasi_fd_table_insert_fd(uvwasi_t* uvwasi,
struct uvwasi_fd_table_t* table,
const uv_file fd,
const int flags,
const char* path,
uvwasi_rights_t rights_base,
uvwasi_rights_t rights_inheriting,
struct uvwasi_fd_wrap_t* wrap) {
struct uvwasi_fd_wrap_t* fd_wrap;
uvwasi_filetype_t type;
uvwasi_rights_t max_base;
uvwasi_rights_t max_inheriting;
uvwasi_errno_t r;
if (table == NULL || path == NULL || wrap == NULL)
return UVWASI_EINVAL;
r = uvwasi__get_type_and_rights(fd, flags, &type, &max_base, &max_inheriting);
if (r != UVWASI_ESUCCESS)
return r;
r = uvwasi__fd_table_insert(uvwasi,
table,
fd,
path,
path,
type,
rights_base & max_base,
rights_inheriting & max_inheriting,
0,
&fd_wrap);
if (r != UVWASI_ESUCCESS)
return r;
*wrap = *fd_wrap;
return UVWASI_ESUCCESS;
}
uvwasi_errno_t uvwasi_fd_table_get(const struct uvwasi_fd_table_t* table,
const uvwasi_fd_t id,
struct uvwasi_fd_wrap_t** wrap,
uvwasi_rights_t rights_base,
uvwasi_rights_t rights_inheriting) {
struct uvwasi_fd_wrap_t* entry;
uvwasi_errno_t err;
if (table == NULL || wrap == NULL)
return UVWASI_EINVAL;
uv_rwlock_rdlock((uv_rwlock_t *)&table->rwlock);
if (id >= table->size) {
err = UVWASI_EBADF;
goto exit;
}
entry = table->fds[id];
if (entry == NULL || entry->id != id) {
err = UVWASI_EBADF;
goto exit;
}
/* Validate that the fd has the necessary rights. */
if ((~entry->rights_base & rights_base) != 0 ||
(~entry->rights_inheriting & rights_inheriting) != 0) {
err = UVWASI_ENOTCAPABLE;
goto exit;
}
uv_mutex_lock(&entry->mutex);
*wrap = entry;
err = UVWASI_ESUCCESS;
exit:
uv_rwlock_rdunlock((uv_rwlock_t *)&table->rwlock);
return err;
}
uvwasi_errno_t uvwasi_fd_table_remove(uvwasi_t* uvwasi,
struct uvwasi_fd_table_t* table,
const uvwasi_fd_t id) {
struct uvwasi_fd_wrap_t* entry;
uvwasi_errno_t err;
if (table == NULL)
return UVWASI_EINVAL;
uv_rwlock_wrlock(&table->rwlock);
if (id >= table->size) {
err = UVWASI_EBADF;
goto exit;
}
entry = table->fds[id];
if (entry == NULL || entry->id != id) {
err = UVWASI_EBADF;
goto exit;
}
uv_mutex_destroy(&entry->mutex);
uvwasi__free(uvwasi, entry);
table->fds[id] = NULL;
table->used--;
err = UVWASI_ESUCCESS;
exit:
uv_rwlock_wrunlock(&table->rwlock);
return err;
}