sys/compat/cloudabi/cloudabi_fd.c

   1 /*-
   2  * Copyright (c) 2015 Nuxi, https://nuxi.nl/
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 __FBSDID("$FreeBSD$");
  28
  29 #include <sys/param.h>
  30 #include <sys/capsicum.h>
  31 #include <sys/filedesc.h>
  32 #include <sys/proc.h>
  33 #include <sys/mman.h>
  34 #include <sys/socketvar.h>
  35 #include <sys/syscallsubr.h>
  36 #include <sys/sysproto.h>
  37 #include <sys/systm.h>
  38 #include <sys/unistd.h>
  39 #include <sys/vnode.h>
  40
  41 #include <contrib/cloudabi/cloudabi_types_common.h>
  42
  43 #include <compat/cloudabi/cloudabi_proto.h>
  44 #include <compat/cloudabi/cloudabi_util.h>
  45
  46 /* Translation between CloudABI and Capsicum rights. */
  47 #define RIGHTS_MAPPINGS \
  48         MAPPING(CLOUDABI_RIGHT_FD_DATASYNC, CAP_FSYNC)                  \
  49         MAPPING(CLOUDABI_RIGHT_FD_READ, CAP_READ)                       \
  50         MAPPING(CLOUDABI_RIGHT_FD_SEEK, CAP_SEEK)                       \
  51         MAPPING(CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS, CAP_FCNTL)            \
  52         MAPPING(CLOUDABI_RIGHT_FD_SYNC, CAP_FSYNC)                      \
  53         MAPPING(CLOUDABI_RIGHT_FD_TELL, CAP_SEEK_TELL)                  \
  54         MAPPING(CLOUDABI_RIGHT_FD_WRITE, CAP_WRITE)                     \
  55         MAPPING(CLOUDABI_RIGHT_FILE_ADVISE)                             \
  56         MAPPING(CLOUDABI_RIGHT_FILE_ALLOCATE, CAP_WRITE)                \
  57         MAPPING(CLOUDABI_RIGHT_FILE_CREATE_DIRECTORY, CAP_MKDIRAT)      \
  58         MAPPING(CLOUDABI_RIGHT_FILE_CREATE_FILE, CAP_CREATE)            \
  59         MAPPING(CLOUDABI_RIGHT_FILE_CREATE_FIFO, CAP_MKFIFOAT)          \
  60         MAPPING(CLOUDABI_RIGHT_FILE_LINK_SOURCE, CAP_LINKAT_SOURCE)     \
  61         MAPPING(CLOUDABI_RIGHT_FILE_LINK_TARGET, CAP_LINKAT_TARGET)     \
  62         MAPPING(CLOUDABI_RIGHT_FILE_OPEN, CAP_LOOKUP)                   \
  63         MAPPING(CLOUDABI_RIGHT_FILE_READDIR, CAP_READ)                  \
  64         MAPPING(CLOUDABI_RIGHT_FILE_READLINK, CAP_LOOKUP)               \
  65         MAPPING(CLOUDABI_RIGHT_FILE_RENAME_SOURCE, CAP_RENAMEAT_SOURCE) \
  66         MAPPING(CLOUDABI_RIGHT_FILE_RENAME_TARGET, CAP_RENAMEAT_TARGET) \
  67         MAPPING(CLOUDABI_RIGHT_FILE_STAT_FGET, CAP_FSTAT)               \
  68         MAPPING(CLOUDABI_RIGHT_FILE_STAT_FPUT_SIZE, CAP_FTRUNCATE)      \
  69         MAPPING(CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES, CAP_FUTIMES)       \
  70         MAPPING(CLOUDABI_RIGHT_FILE_STAT_GET, CAP_FSTATAT)              \
  71         MAPPING(CLOUDABI_RIGHT_FILE_STAT_PUT_TIMES, CAP_FUTIMESAT)      \
  72         MAPPING(CLOUDABI_RIGHT_FILE_SYMLINK, CAP_SYMLINKAT)             \
  73         MAPPING(CLOUDABI_RIGHT_FILE_UNLINK, CAP_UNLINKAT)               \
  74         MAPPING(CLOUDABI_RIGHT_MEM_MAP, CAP_MMAP)                       \
  75         MAPPING(CLOUDABI_RIGHT_MEM_MAP_EXEC, CAP_MMAP_X)                \
  76         MAPPING(CLOUDABI_RIGHT_POLL_FD_READWRITE, CAP_EVENT)            \
  77         MAPPING(CLOUDABI_RIGHT_POLL_MODIFY, CAP_KQUEUE_CHANGE)          \
  78         MAPPING(CLOUDABI_RIGHT_POLL_PROC_TERMINATE, CAP_EVENT)          \
  79         MAPPING(CLOUDABI_RIGHT_POLL_WAIT, CAP_KQUEUE_EVENT)             \
  80         MAPPING(CLOUDABI_RIGHT_PROC_EXEC, CAP_FEXECVE)                  \
  81         MAPPING(CLOUDABI_RIGHT_SOCK_ACCEPT, CAP_ACCEPT)                 \
  82         MAPPING(CLOUDABI_RIGHT_SOCK_BIND_DIRECTORY, CAP_BINDAT)         \
  83         MAPPING(CLOUDABI_RIGHT_SOCK_BIND_SOCKET, CAP_BIND)              \
  84         MAPPING(CLOUDABI_RIGHT_SOCK_CONNECT_DIRECTORY, CAP_CONNECTAT)   \
  85         MAPPING(CLOUDABI_RIGHT_SOCK_CONNECT_SOCKET, CAP_CONNECT)        \
  86         MAPPING(CLOUDABI_RIGHT_SOCK_LISTEN, CAP_LISTEN)                 \
  87         MAPPING(CLOUDABI_RIGHT_SOCK_SHUTDOWN, CAP_SHUTDOWN)             \
  88         MAPPING(CLOUDABI_RIGHT_SOCK_STAT_GET, CAP_GETPEERNAME,          \
  89             CAP_GETSOCKNAME, CAP_GETSOCKOPT)
  90
  91 int
  92 cloudabi_sys_fd_close(struct thread *td, struct cloudabi_sys_fd_close_args *uap)
  93 {
  94
  95         return (kern_close(td, uap->fd));
  96 }
  97
  98 int
  99 cloudabi_sys_fd_create1(struct thread *td,
 100     struct cloudabi_sys_fd_create1_args *uap)
 101 {
 102         struct filecaps fcaps = {};
 103
 104         switch (uap->type) {
 105         case CLOUDABI_FILETYPE_POLL:
 106                 cap_rights_init(&fcaps.fc_rights, CAP_FSTAT, CAP_KQUEUE);
 107                 return (kern_kqueue(td, 0, &fcaps));
 108         case CLOUDABI_FILETYPE_SHARED_MEMORY:
 109                 cap_rights_init(&fcaps.fc_rights, CAP_FSTAT, CAP_FTRUNCATE,
 110                     CAP_MMAP_RWX);
 111                 return (kern_shm_open(td, SHM_ANON, O_RDWR, 0, &fcaps));
 112         case CLOUDABI_FILETYPE_SOCKET_DGRAM:
 113                 return (kern_socket(td, AF_UNIX, SOCK_DGRAM, 0));
 114         case CLOUDABI_FILETYPE_SOCKET_SEQPACKET:
 115                 return (kern_socket(td, AF_UNIX, SOCK_SEQPACKET, 0));
 116         case CLOUDABI_FILETYPE_SOCKET_STREAM:
 117                 return (kern_socket(td, AF_UNIX, SOCK_STREAM, 0));
 118         default:
 119                 return (EINVAL);
 120         }
 121 }
 122
 123 int
 124 cloudabi_sys_fd_create2(struct thread *td,
 125     struct cloudabi_sys_fd_create2_args *uap)
 126 {
 127         struct filecaps fcaps1 = {}, fcaps2 = {};
 128         int fds[2];
 129         int error;
 130
 131         switch (uap->type) {
 132         case CLOUDABI_FILETYPE_FIFO:
 133                 /*
 134                  * CloudABI pipes are unidirectional. Restrict rights on
 135                  * the pipe to simulate this.
 136                  */
 137                 cap_rights_init(&fcaps1.fc_rights, CAP_EVENT, CAP_FCNTL,
 138                     CAP_FSTAT, CAP_READ);
 139                 fcaps1.fc_fcntls = CAP_FCNTL_SETFL;
 140                 cap_rights_init(&fcaps2.fc_rights, CAP_EVENT, CAP_FCNTL,
 141                     CAP_FSTAT, CAP_WRITE);
 142                 fcaps2.fc_fcntls = CAP_FCNTL_SETFL;
 143                 error = kern_pipe(td, fds, 0, &fcaps1, &fcaps2);
 144                 break;
 145         case CLOUDABI_FILETYPE_SOCKET_DGRAM:
 146                 error = kern_socketpair(td, AF_UNIX, SOCK_DGRAM, 0, fds);
 147                 break;
 148         case CLOUDABI_FILETYPE_SOCKET_SEQPACKET:
 149                 error = kern_socketpair(td, AF_UNIX, SOCK_SEQPACKET, 0, fds);
 150                 break;
 151         case CLOUDABI_FILETYPE_SOCKET_STREAM:
 152                 error = kern_socketpair(td, AF_UNIX, SOCK_STREAM, 0, fds);
 153                 break;
 154         default:
 155                 return (EINVAL);
 156         }
 157
 158         if (error == 0) {
 159                 td->td_retval[0] = fds[0];
 160                 td->td_retval[1] = fds[1];
 161         }
 162         return (0);
 163 }
 164
 165 int
 166 cloudabi_sys_fd_datasync(struct thread *td,
 167     struct cloudabi_sys_fd_datasync_args *uap)
 168 {
 169
 170         return (kern_fsync(td, uap->fd, false));
 171 }
 172
 173 int
 174 cloudabi_sys_fd_dup(struct thread *td, struct cloudabi_sys_fd_dup_args *uap)
 175 {
 176
 177         return (kern_dup(td, FDDUP_NORMAL, 0, uap->from, 0));
 178 }
 179
 180 int
 181 cloudabi_sys_fd_replace(struct thread *td,
 182     struct cloudabi_sys_fd_replace_args *uap)
 183 {
 184         int error;
 185
 186         /*
 187          * CloudABI's equivalent to dup2(). CloudABI processes should
 188          * not depend on hardcoded file descriptor layouts, but simply
 189          * use the file descriptor numbers that are allocated by the
 190          * kernel. Duplicating file descriptors to arbitrary numbers
 191          * should not be done.
 192          *
 193          * Invoke kern_dup() with FDDUP_MUSTREPLACE, so that we return
 194          * EBADF when duplicating to a nonexistent file descriptor. Also
 195          * clear the return value, as this system call yields no return
 196          * value.
 197          */
 198         error = kern_dup(td, FDDUP_MUSTREPLACE, 0, uap->from, uap->to);
 199         td->td_retval[0] = 0;
 200         return (error);
 201 }
 202
 203 int
 204 cloudabi_sys_fd_seek(struct thread *td, struct cloudabi_sys_fd_seek_args *uap)
 205 {
 206         int whence;
 207
 208         switch (uap->whence) {
 209         case CLOUDABI_WHENCE_CUR:
 210                 whence = SEEK_CUR;
 211                 break;
 212         case CLOUDABI_WHENCE_END:
 213                 whence = SEEK_END;
 214                 break;
 215         case CLOUDABI_WHENCE_SET:
 216                 whence = SEEK_SET;
 217                 break;
 218         default:
 219                 return (EINVAL);
 220         }
 221
 222         return (kern_lseek(td, uap->fd, uap->offset, whence));
 223 }
 224
 225 /* Converts a file descriptor to a CloudABI file descriptor type. */
 226 cloudabi_filetype_t
 227 cloudabi_convert_filetype(const struct file *fp)
 228 {
 229         struct socket *so;
 230         struct vnode *vp;
 231
 232         switch (fp->f_type) {
 233         case DTYPE_FIFO:
 234                 return (CLOUDABI_FILETYPE_FIFO);
 235         case DTYPE_KQUEUE:
 236                 return (CLOUDABI_FILETYPE_POLL);
 237         case DTYPE_PIPE:
 238                 return (CLOUDABI_FILETYPE_FIFO);
 239         case DTYPE_PROCDESC:
 240                 return (CLOUDABI_FILETYPE_PROCESS);
 241         case DTYPE_SHM:
 242                 return (CLOUDABI_FILETYPE_SHARED_MEMORY);
 243         case DTYPE_SOCKET:
 244                 so = fp->f_data;
 245                 switch (so->so_type) {
 246                 case SOCK_DGRAM:
 247                         return (CLOUDABI_FILETYPE_SOCKET_DGRAM);
 248                 case SOCK_SEQPACKET:
 249                         return (CLOUDABI_FILETYPE_SOCKET_SEQPACKET);
 250                 case SOCK_STREAM:
 251                         return (CLOUDABI_FILETYPE_SOCKET_STREAM);
 252                 default:
 253                         return (CLOUDABI_FILETYPE_UNKNOWN);
 254                 }
 255         case DTYPE_VNODE:
 256                 vp = fp->f_vnode;
 257                 switch (vp->v_type) {
 258                 case VBLK:
 259                         return (CLOUDABI_FILETYPE_BLOCK_DEVICE);
 260                 case VCHR:
 261                         return (CLOUDABI_FILETYPE_CHARACTER_DEVICE);
 262                 case VDIR:
 263                         return (CLOUDABI_FILETYPE_DIRECTORY);
 264                 case VFIFO:
 265                         return (CLOUDABI_FILETYPE_FIFO);
 266                 case VLNK:
 267                         return (CLOUDABI_FILETYPE_SYMBOLIC_LINK);
 268                 case VREG:
 269                         return (CLOUDABI_FILETYPE_REGULAR_FILE);
 270                 case VSOCK:
 271                         return (CLOUDABI_FILETYPE_SOCKET_STREAM);
 272                 default:
 273                         return (CLOUDABI_FILETYPE_UNKNOWN);
 274                 }
 275         default:
 276                 return (CLOUDABI_FILETYPE_UNKNOWN);
 277         }
 278 }
 279
 280 /* Removes rights that conflict with the file descriptor type. */
 281 void
 282 cloudabi_remove_conflicting_rights(cloudabi_filetype_t filetype,
 283     cloudabi_rights_t *base, cloudabi_rights_t *inheriting)
 284 {
 285
 286         /*
 287          * CloudABI has a small number of additional rights bits to
 288          * disambiguate between multiple purposes. Remove the bits that
 289          * don't apply to the type of the file descriptor.
 290          *
 291          * As file descriptor access modes (O_ACCMODE) has been fully
 292          * replaced by rights bits, CloudABI distinguishes between
 293          * rights that apply to the file descriptor itself (base) versus
 294          * rights of new file descriptors derived from them
 295          * (inheriting). The code below approximates the pair by
 296          * decomposing depending on the file descriptor type.
 297          *
 298          * We need to be somewhat accurate about which actions can
 299          * actually be performed on the file descriptor, as functions
 300          * like fcntl(fd, F_GETFL) are emulated on top of this.
 301          */
 302         switch (filetype) {
 303         case CLOUDABI_FILETYPE_DIRECTORY:
 304                 *base &= CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
 305                     CLOUDABI_RIGHT_FD_SYNC | CLOUDABI_RIGHT_FILE_ADVISE |
 306                     CLOUDABI_RIGHT_FILE_CREATE_DIRECTORY |
 307                     CLOUDABI_RIGHT_FILE_CREATE_FILE |
 308                     CLOUDABI_RIGHT_FILE_CREATE_FIFO |
 309                     CLOUDABI_RIGHT_FILE_LINK_SOURCE |
 310                     CLOUDABI_RIGHT_FILE_LINK_TARGET |
 311                     CLOUDABI_RIGHT_FILE_OPEN |
 312                     CLOUDABI_RIGHT_FILE_READDIR |
 313                     CLOUDABI_RIGHT_FILE_READLINK |
 314                     CLOUDABI_RIGHT_FILE_RENAME_SOURCE |
 315                     CLOUDABI_RIGHT_FILE_RENAME_TARGET |
 316                     CLOUDABI_RIGHT_FILE_STAT_FGET |
 317                     CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES |
 318                     CLOUDABI_RIGHT_FILE_STAT_GET |
 319                     CLOUDABI_RIGHT_FILE_STAT_PUT_TIMES |
 320                     CLOUDABI_RIGHT_FILE_SYMLINK |
 321                     CLOUDABI_RIGHT_FILE_UNLINK |
 322                     CLOUDABI_RIGHT_POLL_FD_READWRITE |
 323                     CLOUDABI_RIGHT_SOCK_BIND_DIRECTORY |
 324                     CLOUDABI_RIGHT_SOCK_CONNECT_DIRECTORY;
 325                 *inheriting &= CLOUDABI_RIGHT_FD_DATASYNC |
 326                     CLOUDABI_RIGHT_FD_READ |
 327                     CLOUDABI_RIGHT_FD_SEEK |
 328                     CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
 329                     CLOUDABI_RIGHT_FD_SYNC |
 330                     CLOUDABI_RIGHT_FD_TELL |
 331                     CLOUDABI_RIGHT_FD_WRITE |
 332                     CLOUDABI_RIGHT_FILE_ADVISE |
 333                     CLOUDABI_RIGHT_FILE_ALLOCATE |
 334                     CLOUDABI_RIGHT_FILE_CREATE_DIRECTORY |
 335                     CLOUDABI_RIGHT_FILE_CREATE_FILE |
 336                     CLOUDABI_RIGHT_FILE_CREATE_FIFO |
 337                     CLOUDABI_RIGHT_FILE_LINK_SOURCE |
 338                     CLOUDABI_RIGHT_FILE_LINK_TARGET |
 339                     CLOUDABI_RIGHT_FILE_OPEN |
 340                     CLOUDABI_RIGHT_FILE_READDIR |
 341                     CLOUDABI_RIGHT_FILE_READLINK |
 342                     CLOUDABI_RIGHT_FILE_RENAME_SOURCE |
 343                     CLOUDABI_RIGHT_FILE_RENAME_TARGET |
 344                     CLOUDABI_RIGHT_FILE_STAT_FGET |
 345                     CLOUDABI_RIGHT_FILE_STAT_FPUT_SIZE |
 346                     CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES |
 347                     CLOUDABI_RIGHT_FILE_STAT_GET |
 348                     CLOUDABI_RIGHT_FILE_STAT_PUT_TIMES |
 349                     CLOUDABI_RIGHT_FILE_SYMLINK |
 350                     CLOUDABI_RIGHT_FILE_UNLINK |
 351                     CLOUDABI_RIGHT_MEM_MAP |
 352                     CLOUDABI_RIGHT_MEM_MAP_EXEC |
 353                     CLOUDABI_RIGHT_POLL_FD_READWRITE |
 354                     CLOUDABI_RIGHT_PROC_EXEC |
 355                     CLOUDABI_RIGHT_SOCK_BIND_DIRECTORY |
 356                     CLOUDABI_RIGHT_SOCK_CONNECT_DIRECTORY;
 357                 break;
 358         case CLOUDABI_FILETYPE_FIFO:
 359                 *base &= CLOUDABI_RIGHT_FD_READ |
 360                     CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
 361                     CLOUDABI_RIGHT_FD_WRITE |
 362                     CLOUDABI_RIGHT_FILE_STAT_FGET |
 363                     CLOUDABI_RIGHT_POLL_FD_READWRITE;
 364                 *inheriting = 0;
 365                 break;
 366         case CLOUDABI_FILETYPE_POLL:
 367                 *base &= ~CLOUDABI_RIGHT_FILE_ADVISE;
 368                 *inheriting = 0;
 369                 break;
 370         case CLOUDABI_FILETYPE_PROCESS:
 371                 *base &= ~(CLOUDABI_RIGHT_FILE_ADVISE |
 372                     CLOUDABI_RIGHT_POLL_FD_READWRITE);
 373                 *inheriting = 0;
 374                 break;
 375         case CLOUDABI_FILETYPE_REGULAR_FILE:
 376                 *base &= CLOUDABI_RIGHT_FD_DATASYNC |
 377                     CLOUDABI_RIGHT_FD_READ |
 378                     CLOUDABI_RIGHT_FD_SEEK |
 379                     CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
 380                     CLOUDABI_RIGHT_FD_SYNC |
 381                     CLOUDABI_RIGHT_FD_TELL |
 382                     CLOUDABI_RIGHT_FD_WRITE |
 383                     CLOUDABI_RIGHT_FILE_ADVISE |
 384                     CLOUDABI_RIGHT_FILE_ALLOCATE |
 385                     CLOUDABI_RIGHT_FILE_STAT_FGET |
 386                     CLOUDABI_RIGHT_FILE_STAT_FPUT_SIZE |
 387                     CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES |
 388                     CLOUDABI_RIGHT_MEM_MAP |
 389                     CLOUDABI_RIGHT_MEM_MAP_EXEC |
 390                     CLOUDABI_RIGHT_POLL_FD_READWRITE |
 391                     CLOUDABI_RIGHT_PROC_EXEC;
 392                 *inheriting = 0;
 393                 break;
 394         case CLOUDABI_FILETYPE_SHARED_MEMORY:
 395                 *base &= ~(CLOUDABI_RIGHT_FD_SEEK |
 396                     CLOUDABI_RIGHT_FD_TELL |
 397                     CLOUDABI_RIGHT_FILE_ADVISE |
 398                     CLOUDABI_RIGHT_FILE_ALLOCATE |
 399                     CLOUDABI_RIGHT_FILE_READDIR);
 400                 *inheriting = 0;
 401                 break;
 402         case CLOUDABI_FILETYPE_SOCKET_DGRAM:
 403         case CLOUDABI_FILETYPE_SOCKET_SEQPACKET:
 404         case CLOUDABI_FILETYPE_SOCKET_STREAM:
 405                 *base &= CLOUDABI_RIGHT_FD_READ |
 406                     CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
 407                     CLOUDABI_RIGHT_FD_WRITE |
 408                     CLOUDABI_RIGHT_FILE_STAT_FGET |
 409                     CLOUDABI_RIGHT_POLL_FD_READWRITE |
 410                     CLOUDABI_RIGHT_SOCK_ACCEPT |
 411                     CLOUDABI_RIGHT_SOCK_BIND_SOCKET |
 412                     CLOUDABI_RIGHT_SOCK_CONNECT_SOCKET |
 413                     CLOUDABI_RIGHT_SOCK_LISTEN |
 414                     CLOUDABI_RIGHT_SOCK_SHUTDOWN |
 415                     CLOUDABI_RIGHT_SOCK_STAT_GET;
 416                 break;
 417         default:
 418                 *inheriting = 0;
 419                 break;
 420         }
 421 }
 422
 423 /* Converts FreeBSD's Capsicum rights to CloudABI's set of rights. */
 424 static void
 425 convert_capabilities(const cap_rights_t *capabilities,
 426     cloudabi_filetype_t filetype, cloudabi_rights_t *base,
 427     cloudabi_rights_t *inheriting)
 428 {
 429         cloudabi_rights_t rights;
 430
 431         /* Convert FreeBSD bits to CloudABI bits. */
 432         rights = 0;
 433 #define MAPPING(cloudabi, ...) do {                             \
 434         if (cap_rights_is_set(capabilities, ##__VA_ARGS__))     \
 435                 rights |= (cloudabi);                           \
 436 } while (0);
 437         RIGHTS_MAPPINGS
 438 #undef MAPPING
 439
 440         *base = rights;
 441         *inheriting = rights;
 442         cloudabi_remove_conflicting_rights(filetype, base, inheriting);
 443 }
 444
 445 int
 446 cloudabi_sys_fd_stat_get(struct thread *td,
 447     struct cloudabi_sys_fd_stat_get_args *uap)
 448 {
 449         cloudabi_fdstat_t fsb = {};
 450         struct file *fp;
 451         cap_rights_t rights;
 452         struct filecaps fcaps;
 453         int error, oflags;
 454
 455         /* Obtain file descriptor properties. */
 456         error = fget_cap(td, uap->fd, cap_rights_init(&rights), &fp,
 457             &fcaps);
 458         if (error != 0)
 459                 return (error);
 460         oflags = OFLAGS(fp->f_flag);
 461         fsb.fs_filetype = cloudabi_convert_filetype(fp);
 462         fdrop(fp, td);
 463
 464         /* Convert file descriptor flags. */
 465         if (oflags & O_APPEND)
 466                 fsb.fs_flags |= CLOUDABI_FDFLAG_APPEND;
 467         if (oflags & O_NONBLOCK)
 468                 fsb.fs_flags |= CLOUDABI_FDFLAG_NONBLOCK;
 469         if (oflags & O_SYNC)
 470                 fsb.fs_flags |= CLOUDABI_FDFLAG_SYNC;
 471
 472         /* Convert capabilities to CloudABI rights. */
 473         convert_capabilities(&fcaps.fc_rights, fsb.fs_filetype,
 474             &fsb.fs_rights_base, &fsb.fs_rights_inheriting);
 475         filecaps_free(&fcaps);
 476         return (copyout(&fsb, (void *)uap->buf, sizeof(fsb)));
 477 }
 478
 479 /* Converts CloudABI rights to a set of Capsicum capabilities. */
 480 int
 481 cloudabi_convert_rights(cloudabi_rights_t in, cap_rights_t *out)
 482 {
 483
 484         cap_rights_init(out);
 485 #define MAPPING(cloudabi, ...) do {                     \
 486         if (in & (cloudabi)) {                          \
 487                 cap_rights_set(out, ##__VA_ARGS__);     \
 488                 in &= ~(cloudabi);                      \
 489         }                                               \
 490 } while (0);
 491         RIGHTS_MAPPINGS
 492 #undef MAPPING
 493         if (in != 0)
 494                 return (ENOTCAPABLE);
 495         return (0);
 496 }
 497
 498 int
 499 cloudabi_sys_fd_stat_put(struct thread *td,
 500     struct cloudabi_sys_fd_stat_put_args *uap)
 501 {
 502         cloudabi_fdstat_t fsb;
 503         cap_rights_t rights;
 504         int error, oflags;
 505
 506         error = copyin(uap->buf, &fsb, sizeof(fsb));
 507         if (error != 0)
 508                 return (error);
 509
 510         if (uap->flags == CLOUDABI_FDSTAT_FLAGS) {
 511                 /* Convert flags. */
 512                 oflags = 0;
 513                 if (fsb.fs_flags & CLOUDABI_FDFLAG_APPEND)
 514                         oflags |= O_APPEND;
 515                 if (fsb.fs_flags & CLOUDABI_FDFLAG_NONBLOCK)
 516                         oflags |= O_NONBLOCK;
 517                 if (fsb.fs_flags & (CLOUDABI_FDFLAG_SYNC |
 518                     CLOUDABI_FDFLAG_DSYNC | CLOUDABI_FDFLAG_RSYNC))
 519                         oflags |= O_SYNC;
 520                 return (kern_fcntl(td, uap->fd, F_SETFL, oflags));
 521         } else if (uap->flags == CLOUDABI_FDSTAT_RIGHTS) {
 522                 /* Convert rights. */
 523                 error = cloudabi_convert_rights(
 524                     fsb.fs_rights_base | fsb.fs_rights_inheriting, &rights);
 525                 if (error != 0)
 526                         return (error);
 527                 return (kern_cap_rights_limit(td, uap->fd, &rights));
 528         }
 529         return (EINVAL);
 530 }
 531
 532 int
 533 cloudabi_sys_fd_sync(struct thread *td, struct cloudabi_sys_fd_sync_args *uap)
 534 {
 535
 536         return (kern_fsync(td, uap->fd, true));
 537 }