1 /* $NetBSD: hijack.c,v 1.124 2017/10/23 06:52:17 ozaki-r Exp $ */ 2 3 /*- 4 * Copyright (c) 2011 Antti Kantee. All Rights Reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 /* 29 * XXX: rumphijack sort of works on glibc Linux. But it's not 30 * the same quality working as on NetBSD. 31 * autoconf HAVE_FOO vs. __NetBSD__ / __linux__ could be further 32 * improved. 33 */ 34 #include <rump/rumpuser_port.h> 35 36 #if !defined(lint) 37 __RCSID("$NetBSD: hijack.c,v 1.124 2017/10/23 06:52:17 ozaki-r Exp $"); 38 #endif 39 40 #include <sys/param.h> 41 #include <sys/types.h> 42 #include <sys/ioctl.h> 43 #include <sys/mman.h> 44 #include <sys/mount.h> 45 #include <sys/socket.h> 46 #include <sys/stat.h> 47 #include <sys/time.h> 48 #include <sys/uio.h> 49 50 #ifdef __NetBSD__ 51 #include <sys/statvfs.h> 52 #endif 53 54 #ifdef HAVE_KQUEUE 55 #include <sys/event.h> 56 #endif 57 58 #ifdef __NetBSD__ 59 #include <sys/quotactl.h> 60 #endif 61 62 #include <assert.h> 63 #include <dlfcn.h> 64 #include <err.h> 65 #include <errno.h> 66 #include <fcntl.h> 67 #include <poll.h> 68 #include <pthread.h> 69 #include <signal.h> 70 #include <stdarg.h> 71 #include <stdbool.h> 72 #include <stdint.h> 73 #include <stdio.h> 74 #include <stdlib.h> 75 #include <string.h> 76 #include <time.h> 77 #include <unistd.h> 78 79 #include <rump/rumpclient.h> 80 #include <rump/rump_syscalls.h> 81 82 #include "hijack.h" 83 84 /* 85 * XXX: Consider autogenerating this, syscnames[] and syscalls[] with 86 * a DSL where the tool also checks the symbols exported by this library 87 * to make sure all relevant calls are accounted for. 88 */ 89 enum dualcall { 90 DUALCALL_WRITE, DUALCALL_WRITEV, DUALCALL_PWRITE, DUALCALL_PWRITEV, 91 DUALCALL_IOCTL, DUALCALL_FCNTL, 92 DUALCALL_SOCKET, DUALCALL_ACCEPT, DUALCALL_PACCEPT, 93 DUALCALL_BIND, DUALCALL_CONNECT, 94 DUALCALL_GETPEERNAME, DUALCALL_GETSOCKNAME, DUALCALL_LISTEN, 95 DUALCALL_RECVFROM, DUALCALL_RECVMSG, 96 DUALCALL_SENDTO, DUALCALL_SENDMSG, 97 DUALCALL_GETSOCKOPT, DUALCALL_SETSOCKOPT, 98 DUALCALL_SHUTDOWN, 99 DUALCALL_READ, DUALCALL_READV, DUALCALL_PREAD, DUALCALL_PREADV, 100 DUALCALL_DUP2, 101 DUALCALL_CLOSE, 102 DUALCALL_POLLTS, 103 104 #ifndef __linux__ 105 DUALCALL_STAT, DUALCALL_LSTAT, DUALCALL_FSTAT, 106 #endif 107 108 DUALCALL_CHMOD, DUALCALL_LCHMOD, DUALCALL_FCHMOD, 109 DUALCALL_CHOWN, DUALCALL_LCHOWN, DUALCALL_FCHOWN, 110 DUALCALL_OPEN, 111 DUALCALL_CHDIR, DUALCALL_FCHDIR, 112 DUALCALL_LSEEK, 113 DUALCALL_UNLINK, DUALCALL_SYMLINK, DUALCALL_READLINK, 114 DUALCALL_LINK, DUALCALL_RENAME, 115 DUALCALL_MKDIR, DUALCALL_RMDIR, 116 DUALCALL_UTIMES, DUALCALL_LUTIMES, DUALCALL_FUTIMES, 117 DUALCALL_UTIMENSAT, DUALCALL_FUTIMENS, 118 DUALCALL_TRUNCATE, DUALCALL_FTRUNCATE, 119 DUALCALL_FSYNC, 120 DUALCALL_ACCESS, 121 122 #ifndef __linux__ 123 DUALCALL___GETCWD, 124 DUALCALL_GETDENTS, 125 #endif 126 127 #ifndef __linux__ 128 DUALCALL_MKNOD, 129 #endif 130 131 #ifdef __NetBSD__ 132 DUALCALL_GETFH, DUALCALL_FHOPEN, DUALCALL_FHSTAT, DUALCALL_FHSTATVFS1, 133 #endif 134 135 #ifdef HAVE_KQUEUE 136 DUALCALL_KEVENT, 137 #endif 138 139 #ifdef __NetBSD__ 140 DUALCALL___SYSCTL, 141 #endif 142 143 #ifdef __NetBSD__ 144 DUALCALL_NFSSVC, 145 #endif 146 147 #ifdef __NetBSD__ 148 DUALCALL_STATVFS1, DUALCALL_FSTATVFS1, DUALCALL_GETVFSSTAT, 149 #endif 150 151 #ifdef __NetBSD__ 152 DUALCALL_MOUNT, DUALCALL_UNMOUNT, 153 #endif 154 155 #ifdef HAVE_FSYNC_RANGE 156 DUALCALL_FSYNC_RANGE, 157 #endif 158 159 #ifdef HAVE_CHFLAGS 160 DUALCALL_CHFLAGS, DUALCALL_LCHFLAGS, DUALCALL_FCHFLAGS, 161 #endif 162 163 #ifdef HAVE___QUOTACTL 164 DUALCALL_QUOTACTL, 165 #endif 166 #ifdef __NetBSD__ 167 DUALCALL_LINKAT, 168 #endif 169 DUALCALL__NUM 170 }; 171 172 #define RSYS_STRING(a) __STRING(a) 173 #define RSYS_NAME(a) RSYS_STRING(__CONCAT(RUMP_SYS_RENAME_,a)) 174 175 /* 176 * Would be nice to get this automatically in sync with libc. 177 * Also, this does not work for compat-using binaries (we should 178 * provide all previous interfaces, not just the current ones) 179 */ 180 #if defined(__NetBSD__) 181 182 #if !__NetBSD_Prereq__(5,99,7) 183 #define REALSELECT select 184 #define REALPOLLTS pollts 185 #define REALKEVENT kevent 186 #define REALSTAT __stat30 187 #define REALLSTAT __lstat30 188 #define REALFSTAT __fstat30 189 #define REALUTIMES utimes 190 #define REALLUTIMES lutimes 191 #define REALFUTIMES futimes 192 #define REALMKNOD mknod 193 #define REALFHSTAT __fhstat40 194 #else /* >= 5.99.7 */ 195 #define REALSELECT _sys___select50 196 #define REALPOLLTS _sys___pollts50 197 #define REALKEVENT _sys___kevent50 198 #define REALSTAT __stat50 199 #define REALLSTAT __lstat50 200 #define REALFSTAT __fstat50 201 #define REALUTIMES __utimes50 202 #define REALLUTIMES __lutimes50 203 #define REALFUTIMES __futimes50 204 #define REALMKNOD __mknod50 205 #define REALFHSTAT __fhstat50 206 #endif /* < 5.99.7 */ 207 208 #define REALREAD _sys_read 209 #define REALPREAD _sys_pread 210 #define REALPWRITE _sys_pwrite 211 #define REALGETDENTS __getdents30 212 #define REALMOUNT __mount50 213 #define REALGETFH __getfh30 214 #define REALFHOPEN __fhopen40 215 #define REALFHSTATVFS1 __fhstatvfs140 216 #define REALSOCKET __socket30 217 218 #define LSEEK_ALIAS _lseek 219 #define VFORK __vfork14 220 221 int REALSTAT(const char *, struct stat *); 222 int REALLSTAT(const char *, struct stat *); 223 int REALFSTAT(int, struct stat *); 224 int REALMKNOD(const char *, mode_t, dev_t); 225 int REALGETDENTS(int, char *, size_t); 226 227 int __getcwd(char *, size_t); 228 229 #elif defined(__linux__) /* glibc, really */ 230 231 #define REALREAD read 232 #define REALPREAD pread 233 #define REALPWRITE pwrite 234 #define REALSELECT select 235 #define REALPOLLTS ppoll 236 #define REALUTIMES utimes 237 #define REALLUTIMES lutimes 238 #define REALFUTIMES futimes 239 #define REALFHSTAT fhstat 240 #define REALSOCKET socket 241 242 #else /* !NetBSD && !linux */ 243 244 #error platform not supported 245 246 #endif /* platform */ 247 248 int REALSELECT(int, fd_set *, fd_set *, fd_set *, struct timeval *); 249 int REALPOLLTS(struct pollfd *, nfds_t, 250 const struct timespec *, const sigset_t *); 251 int REALKEVENT(int, const struct kevent *, size_t, struct kevent *, size_t, 252 const struct timespec *); 253 ssize_t REALREAD(int, void *, size_t); 254 ssize_t REALPREAD(int, void *, size_t, off_t); 255 ssize_t REALPWRITE(int, const void *, size_t, off_t); 256 int REALUTIMES(const char *, const struct timeval [2]); 257 int REALLUTIMES(const char *, const struct timeval [2]); 258 int REALFUTIMES(int, const struct timeval [2]); 259 int REALMOUNT(const char *, const char *, int, void *, size_t); 260 int REALGETFH(const char *, void *, size_t *); 261 int REALFHOPEN(const void *, size_t, int); 262 int REALFHSTAT(const void *, size_t, struct stat *); 263 int REALFHSTATVFS1(const void *, size_t, struct statvfs *, int); 264 int REALSOCKET(int, int, int); 265 266 #define S(a) __STRING(a) 267 struct sysnames { 268 enum dualcall scm_callnum; 269 const char *scm_hostname; 270 const char *scm_rumpname; 271 } syscnames[] = { 272 { DUALCALL_SOCKET, S(REALSOCKET), RSYS_NAME(SOCKET) }, 273 { DUALCALL_ACCEPT, "accept", RSYS_NAME(ACCEPT) }, 274 { DUALCALL_PACCEPT, "paccept", RSYS_NAME(PACCEPT) }, 275 { DUALCALL_BIND, "bind", RSYS_NAME(BIND) }, 276 { DUALCALL_CONNECT, "connect", RSYS_NAME(CONNECT) }, 277 { DUALCALL_GETPEERNAME, "getpeername", RSYS_NAME(GETPEERNAME) }, 278 { DUALCALL_GETSOCKNAME, "getsockname", RSYS_NAME(GETSOCKNAME) }, 279 { DUALCALL_LISTEN, "listen", RSYS_NAME(LISTEN) }, 280 { DUALCALL_RECVFROM, "recvfrom", RSYS_NAME(RECVFROM) }, 281 { DUALCALL_RECVMSG, "recvmsg", RSYS_NAME(RECVMSG) }, 282 { DUALCALL_SENDTO, "sendto", RSYS_NAME(SENDTO) }, 283 { DUALCALL_SENDMSG, "sendmsg", RSYS_NAME(SENDMSG) }, 284 { DUALCALL_GETSOCKOPT, "getsockopt", RSYS_NAME(GETSOCKOPT) }, 285 { DUALCALL_SETSOCKOPT, "setsockopt", RSYS_NAME(SETSOCKOPT) }, 286 { DUALCALL_SHUTDOWN, "shutdown", RSYS_NAME(SHUTDOWN) }, 287 { DUALCALL_READ, S(REALREAD), RSYS_NAME(READ) }, 288 { DUALCALL_READV, "readv", RSYS_NAME(READV) }, 289 { DUALCALL_PREAD, S(REALPREAD), RSYS_NAME(PREAD) }, 290 { DUALCALL_PREADV, "preadv", RSYS_NAME(PREADV) }, 291 { DUALCALL_WRITE, "write", RSYS_NAME(WRITE) }, 292 { DUALCALL_WRITEV, "writev", RSYS_NAME(WRITEV) }, 293 { DUALCALL_PWRITE, S(REALPWRITE), RSYS_NAME(PWRITE) }, 294 { DUALCALL_PWRITEV, "pwritev", RSYS_NAME(PWRITEV) }, 295 { DUALCALL_IOCTL, "ioctl", RSYS_NAME(IOCTL) }, 296 { DUALCALL_FCNTL, "fcntl", RSYS_NAME(FCNTL) }, 297 { DUALCALL_DUP2, "dup2", RSYS_NAME(DUP2) }, 298 { DUALCALL_CLOSE, "close", RSYS_NAME(CLOSE) }, 299 { DUALCALL_POLLTS, S(REALPOLLTS), RSYS_NAME(POLLTS) }, 300 #ifndef __linux__ 301 { DUALCALL_STAT, S(REALSTAT), RSYS_NAME(STAT) }, 302 { DUALCALL_LSTAT, S(REALLSTAT), RSYS_NAME(LSTAT) }, 303 { DUALCALL_FSTAT, S(REALFSTAT), RSYS_NAME(FSTAT) }, 304 #endif 305 { DUALCALL_CHOWN, "chown", RSYS_NAME(CHOWN) }, 306 { DUALCALL_LCHOWN, "lchown", RSYS_NAME(LCHOWN) }, 307 { DUALCALL_FCHOWN, "fchown", RSYS_NAME(FCHOWN) }, 308 { DUALCALL_CHMOD, "chmod", RSYS_NAME(CHMOD) }, 309 { DUALCALL_LCHMOD, "lchmod", RSYS_NAME(LCHMOD) }, 310 { DUALCALL_FCHMOD, "fchmod", RSYS_NAME(FCHMOD) }, 311 { DUALCALL_UTIMES, S(REALUTIMES), RSYS_NAME(UTIMES) }, 312 { DUALCALL_LUTIMES, S(REALLUTIMES), RSYS_NAME(LUTIMES) }, 313 { DUALCALL_FUTIMES, S(REALFUTIMES), RSYS_NAME(FUTIMES) }, 314 { DUALCALL_UTIMENSAT, "utimensat", RSYS_NAME(UTIMENSAT) }, 315 { DUALCALL_FUTIMENS, "futimens", RSYS_NAME(FUTIMENS) }, 316 { DUALCALL_OPEN, "open", RSYS_NAME(OPEN) }, 317 { DUALCALL_CHDIR, "chdir", RSYS_NAME(CHDIR) }, 318 { DUALCALL_FCHDIR, "fchdir", RSYS_NAME(FCHDIR) }, 319 { DUALCALL_LSEEK, "lseek", RSYS_NAME(LSEEK) }, 320 { DUALCALL_UNLINK, "unlink", RSYS_NAME(UNLINK) }, 321 { DUALCALL_SYMLINK, "symlink", RSYS_NAME(SYMLINK) }, 322 { DUALCALL_READLINK, "readlink", RSYS_NAME(READLINK) }, 323 { DUALCALL_LINK, "link", RSYS_NAME(LINK) }, 324 { DUALCALL_RENAME, "rename", RSYS_NAME(RENAME) }, 325 { DUALCALL_MKDIR, "mkdir", RSYS_NAME(MKDIR) }, 326 { DUALCALL_RMDIR, "rmdir", RSYS_NAME(RMDIR) }, 327 { DUALCALL_TRUNCATE, "truncate", RSYS_NAME(TRUNCATE) }, 328 { DUALCALL_FTRUNCATE, "ftruncate", RSYS_NAME(FTRUNCATE) }, 329 { DUALCALL_FSYNC, "fsync", RSYS_NAME(FSYNC) }, 330 { DUALCALL_ACCESS, "access", RSYS_NAME(ACCESS) }, 331 332 #ifndef __linux__ 333 { DUALCALL___GETCWD, "__getcwd", RSYS_NAME(__GETCWD) }, 334 { DUALCALL_GETDENTS, S(REALGETDENTS),RSYS_NAME(GETDENTS) }, 335 #endif 336 337 #ifndef __linux__ 338 { DUALCALL_MKNOD, S(REALMKNOD), RSYS_NAME(MKNOD) }, 339 #endif 340 341 #ifdef __NetBSD__ 342 { DUALCALL_GETFH, S(REALGETFH), RSYS_NAME(GETFH) }, 343 { DUALCALL_FHOPEN, S(REALFHOPEN), RSYS_NAME(FHOPEN) }, 344 { DUALCALL_FHSTAT, S(REALFHSTAT), RSYS_NAME(FHSTAT) }, 345 { DUALCALL_FHSTATVFS1, S(REALFHSTATVFS1),RSYS_NAME(FHSTATVFS1) }, 346 #endif 347 348 #ifdef HAVE_KQUEUE 349 { DUALCALL_KEVENT, S(REALKEVENT), RSYS_NAME(KEVENT) }, 350 #endif 351 352 #ifdef __NetBSD__ 353 { DUALCALL___SYSCTL, "__sysctl", RSYS_NAME(__SYSCTL) }, 354 #endif 355 356 #ifdef __NetBSD__ 357 { DUALCALL_NFSSVC, "nfssvc", RSYS_NAME(NFSSVC) }, 358 #endif 359 360 #ifdef __NetBSD__ 361 { DUALCALL_STATVFS1, "statvfs1", RSYS_NAME(STATVFS1) }, 362 { DUALCALL_FSTATVFS1, "fstatvfs1", RSYS_NAME(FSTATVFS1) }, 363 { DUALCALL_GETVFSSTAT, "getvfsstat", RSYS_NAME(GETVFSSTAT) }, 364 #endif 365 366 #ifdef __NetBSD__ 367 { DUALCALL_MOUNT, S(REALMOUNT), RSYS_NAME(MOUNT) }, 368 { DUALCALL_UNMOUNT, "unmount", RSYS_NAME(UNMOUNT) }, 369 #endif 370 371 #ifdef HAVE_FSYNC_RANGE 372 { DUALCALL_FSYNC_RANGE, "fsync_range", RSYS_NAME(FSYNC_RANGE) }, 373 #endif 374 375 #ifdef HAVE_CHFLAGS 376 { DUALCALL_CHFLAGS, "chflags", RSYS_NAME(CHFLAGS) }, 377 { DUALCALL_LCHFLAGS, "lchflags", RSYS_NAME(LCHFLAGS) }, 378 { DUALCALL_FCHFLAGS, "fchflags", RSYS_NAME(FCHFLAGS) }, 379 #endif /* HAVE_CHFLAGS */ 380 381 #ifdef HAVE___QUOTACTL 382 { DUALCALL_QUOTACTL, "__quotactl", RSYS_NAME(__QUOTACTL) }, 383 #endif /* HAVE___QUOTACTL */ 384 385 #ifdef __NetBSD__ 386 { DUALCALL_LINKAT, "linkat", RSYS_NAME(LINKAT) }, 387 #endif 388 }; 389 #undef S 390 391 struct bothsys { 392 void *bs_host; 393 void *bs_rump; 394 } syscalls[DUALCALL__NUM]; 395 #define GETSYSCALL(which, name) syscalls[DUALCALL_##name].bs_##which 396 397 static pid_t (*host_fork)(void); 398 static int (*host_daemon)(int, int); 399 static void * (*host_mmap)(void *, size_t, int, int, int, off_t); 400 401 /* 402 * This tracks if our process is in a subdirectory of /rump. 403 * It's preserved over exec. 404 */ 405 static bool pwdinrump; 406 407 enum pathtype { PATH_HOST, PATH_RUMP, PATH_RUMPBLANKET }; 408 409 static bool fd_isrump(int); 410 static enum pathtype path_isrump(const char *); 411 412 /* default FD_SETSIZE is 256 ==> default fdoff is 128 */ 413 static int hijack_fdoff = FD_SETSIZE/2; 414 415 /* 416 * Maintain a mapping table for the usual dup2 suspects. 417 * Could use atomic ops to operate on dup2vec, but an application 418 * racing there is not well-defined, so don't bother. 419 */ 420 /* note: you cannot change this without editing the env-passing code */ 421 #define DUP2HIGH 2 422 static uint32_t dup2vec[DUP2HIGH+1]; 423 #define DUP2BIT (1<<31) 424 #define DUP2ALIAS (1<<30) 425 #define DUP2FDMASK ((1<<30)-1) 426 427 static bool 428 isdup2d(int fd) 429 { 430 431 return fd <= DUP2HIGH && fd >= 0 && dup2vec[fd] & DUP2BIT; 432 } 433 434 static int 435 mapdup2(int hostfd) 436 { 437 438 _DIAGASSERT(isdup2d(hostfd)); 439 return dup2vec[hostfd] & DUP2FDMASK; 440 } 441 442 static int 443 unmapdup2(int rumpfd) 444 { 445 int i; 446 447 for (i = 0; i <= DUP2HIGH; i++) { 448 if (dup2vec[i] & DUP2BIT && 449 (dup2vec[i] & DUP2FDMASK) == (unsigned)rumpfd) 450 return i; 451 } 452 return -1; 453 } 454 455 static void 456 setdup2(int hostfd, int rumpfd) 457 { 458 459 if (hostfd > DUP2HIGH) { 460 _DIAGASSERT(0); 461 return; 462 } 463 464 dup2vec[hostfd] = DUP2BIT | DUP2ALIAS | rumpfd; 465 } 466 467 static void 468 clrdup2(int hostfd) 469 { 470 471 if (hostfd > DUP2HIGH) { 472 _DIAGASSERT(0); 473 return; 474 } 475 476 dup2vec[hostfd] = 0; 477 } 478 479 static bool 480 killdup2alias(int rumpfd) 481 { 482 int hostfd; 483 484 if ((hostfd = unmapdup2(rumpfd)) == -1) 485 return false; 486 487 if (dup2vec[hostfd] & DUP2ALIAS) { 488 dup2vec[hostfd] &= ~DUP2ALIAS; 489 return true; 490 } 491 return false; 492 } 493 494 //#define DEBUGJACK 495 #ifdef DEBUGJACK 496 #define DPRINTF(x) mydprintf x 497 static void 498 mydprintf(const char *fmt, ...) 499 { 500 va_list ap; 501 502 if (isdup2d(STDERR_FILENO)) 503 return; 504 505 va_start(ap, fmt); 506 vfprintf(stderr, fmt, ap); 507 va_end(ap); 508 } 509 510 static const char * 511 whichfd(int fd) 512 { 513 514 if (fd == -1) 515 return "-1"; 516 else if (fd_isrump(fd)) 517 return "rump"; 518 else 519 return "host"; 520 } 521 522 static const char * 523 whichpath(const char *path) 524 { 525 526 if (path_isrump(path)) 527 return "rump"; 528 else 529 return "host"; 530 } 531 532 #else 533 #define DPRINTF(x) 534 #endif 535 536 #define ATCALL(type, name, rcname, args, proto, vars) \ 537 type name args \ 538 { \ 539 type (*fun) proto; \ 540 int isrump = -1; \ 541 \ 542 if (fd == AT_FDCWD || *path == '/') { \ 543 isrump = path_isrump(path); \ 544 } else { \ 545 isrump = fd_isrump(fd); \ 546 } \ 547 \ 548 DPRINTF(("%s -> %d:%s (%s)\n", __STRING(name), \ 549 fd, path, isrump ? "rump" : "host")); \ 550 \ 551 assert(isrump != -1); \ 552 if (isrump) { \ 553 fun = syscalls[rcname].bs_rump; \ 554 if (fd != AT_FDCWD) \ 555 fd = fd_host2rump(fd); \ 556 path = path_host2rump(path); \ 557 } else { \ 558 fun = syscalls[rcname].bs_host; \ 559 } \ 560 return fun vars; \ 561 } 562 563 #define FDCALL(type, name, rcname, args, proto, vars) \ 564 type name args \ 565 { \ 566 type (*fun) proto; \ 567 \ 568 DPRINTF(("%s -> %d (%s)\n", __STRING(name), fd, whichfd(fd))); \ 569 if (fd_isrump(fd)) { \ 570 fun = syscalls[rcname].bs_rump; \ 571 fd = fd_host2rump(fd); \ 572 } else { \ 573 fun = syscalls[rcname].bs_host; \ 574 } \ 575 \ 576 return fun vars; \ 577 } 578 579 #define PATHCALL(type, name, rcname, args, proto, vars) \ 580 type name args \ 581 { \ 582 type (*fun) proto; \ 583 enum pathtype pt; \ 584 \ 585 DPRINTF(("%s -> %s (%s)\n", __STRING(name), path, \ 586 whichpath(path))); \ 587 if ((pt = path_isrump(path)) != PATH_HOST) { \ 588 fun = syscalls[rcname].bs_rump; \ 589 if (pt == PATH_RUMP) \ 590 path = path_host2rump(path); \ 591 } else { \ 592 fun = syscalls[rcname].bs_host; \ 593 } \ 594 \ 595 return fun vars; \ 596 } 597 598 #define VFSCALL(bit, type, name, rcname, args, proto, vars) \ 599 type name args \ 600 { \ 601 type (*fun) proto; \ 602 \ 603 DPRINTF(("%s (0x%x, 0x%x)\n", __STRING(name), bit, vfsbits)); \ 604 if (vfsbits & bit) { \ 605 fun = syscalls[rcname].bs_rump; \ 606 } else { \ 607 fun = syscalls[rcname].bs_host; \ 608 } \ 609 \ 610 return fun vars; \ 611 } 612 613 /* 614 * These variables are set from the RUMPHIJACK string and control 615 * which operations can product rump kernel file descriptors. 616 * This should be easily extendable for future needs. 617 */ 618 #define RUMPHIJACK_DEFAULT "path=/rump,socket=all:nolocal" 619 static bool rumpsockets[PF_MAX]; 620 static const char *rumpprefix; 621 static size_t rumpprefixlen; 622 623 static struct { 624 int pf; 625 const char *name; 626 } socketmap[] = { 627 { PF_LOCAL, "local" }, 628 { PF_INET, "inet" }, 629 #ifdef PF_LINK 630 { PF_LINK, "link" }, 631 #endif 632 #ifdef PF_OROUTE 633 { PF_OROUTE, "oroute" }, 634 #endif 635 { PF_ROUTE, "route" }, 636 { PF_INET6, "inet6" }, 637 #ifdef PF_MPLS 638 { PF_MPLS, "mpls" }, 639 #endif 640 { -1, NULL } 641 }; 642 643 static void 644 sockparser(char *buf) 645 { 646 char *p, *l = NULL; 647 bool value; 648 int i; 649 650 /* if "all" is present, it must be specified first */ 651 if (strncmp(buf, "all", strlen("all")) == 0) { 652 for (i = 0; i < (int)__arraycount(rumpsockets); i++) { 653 rumpsockets[i] = true; 654 } 655 buf += strlen("all"); 656 if (*buf == ':') 657 buf++; 658 } 659 660 for (p = strtok_r(buf, ":", &l); p; p = strtok_r(NULL, ":", &l)) { 661 value = true; 662 if (strncmp(p, "no", strlen("no")) == 0) { 663 value = false; 664 p += strlen("no"); 665 } 666 667 for (i = 0; socketmap[i].name; i++) { 668 if (strcmp(p, socketmap[i].name) == 0) { 669 rumpsockets[socketmap[i].pf] = value; 670 break; 671 } 672 } 673 if (socketmap[i].name == NULL) { 674 errx(1, "invalid socket specifier %s", p); 675 } 676 } 677 } 678 679 static void 680 pathparser(char *buf) 681 { 682 683 /* sanity-check */ 684 if (*buf != '/') 685 errx(1, "hijack path specifier must begin with ``/''"); 686 rumpprefixlen = strlen(buf); 687 if (rumpprefixlen < 2) 688 errx(1, "invalid hijack prefix: %s", buf); 689 if (buf[rumpprefixlen-1] == '/' && strspn(buf, "/") != rumpprefixlen) 690 errx(1, "hijack prefix may end in slash only if pure " 691 "slash, gave %s", buf); 692 693 if ((rumpprefix = strdup(buf)) == NULL) 694 err(1, "strdup"); 695 rumpprefixlen = strlen(rumpprefix); 696 } 697 698 static struct blanket { 699 const char *pfx; 700 size_t len; 701 } *blanket; 702 static int nblanket; 703 704 static void 705 blanketparser(char *buf) 706 { 707 char *p, *l = NULL; 708 int i; 709 710 for (nblanket = 0, p = buf; p; p = strchr(p+1, ':'), nblanket++) 711 continue; 712 713 blanket = malloc(nblanket * sizeof(*blanket)); 714 if (blanket == NULL) 715 err(1, "alloc blanket %d", nblanket); 716 717 for (p = strtok_r(buf, ":", &l), i = 0; p; 718 p = strtok_r(NULL, ":", &l), i++) { 719 blanket[i].pfx = strdup(p); 720 if (blanket[i].pfx == NULL) 721 err(1, "strdup blanket"); 722 blanket[i].len = strlen(p); 723 724 if (blanket[i].len == 0 || *blanket[i].pfx != '/') 725 errx(1, "invalid blanket specifier %s", p); 726 if (*(blanket[i].pfx + blanket[i].len-1) == '/') 727 errx(1, "invalid blanket specifier %s", p); 728 } 729 } 730 731 #define VFSBIT_NFSSVC 0x01 732 #define VFSBIT_GETVFSSTAT 0x02 733 #define VFSBIT_FHCALLS 0x04 734 static unsigned vfsbits; 735 736 static struct { 737 int bit; 738 const char *name; 739 } vfscalls[] = { 740 { VFSBIT_NFSSVC, "nfssvc" }, 741 { VFSBIT_GETVFSSTAT, "getvfsstat" }, 742 { VFSBIT_FHCALLS, "fhcalls" }, 743 { -1, NULL } 744 }; 745 746 static void 747 vfsparser(char *buf) 748 { 749 char *p, *l = NULL; 750 bool turnon; 751 unsigned int fullmask; 752 int i; 753 754 /* build the full mask and sanity-check while we're at it */ 755 fullmask = 0; 756 for (i = 0; vfscalls[i].name != NULL; i++) { 757 if (fullmask & vfscalls[i].bit) 758 errx(1, "problem exists between vi and chair"); 759 fullmask |= vfscalls[i].bit; 760 } 761 762 763 /* if "all" is present, it must be specified first */ 764 if (strncmp(buf, "all", strlen("all")) == 0) { 765 vfsbits = fullmask; 766 buf += strlen("all"); 767 if (*buf == ':') 768 buf++; 769 } 770 771 for (p = strtok_r(buf, ":", &l); p; p = strtok_r(NULL, ":", &l)) { 772 turnon = true; 773 if (strncmp(p, "no", strlen("no")) == 0) { 774 turnon = false; 775 p += strlen("no"); 776 } 777 778 for (i = 0; vfscalls[i].name; i++) { 779 if (strcmp(p, vfscalls[i].name) == 0) { 780 if (turnon) 781 vfsbits |= vfscalls[i].bit; 782 else 783 vfsbits &= ~vfscalls[i].bit; 784 break; 785 } 786 } 787 if (vfscalls[i].name == NULL) { 788 errx(1, "invalid vfscall specifier %s", p); 789 } 790 } 791 } 792 793 static bool rumpsysctl = false; 794 795 static void 796 sysctlparser(char *buf) 797 { 798 799 if (buf == NULL) { 800 rumpsysctl = true; 801 return; 802 } 803 804 if (strcasecmp(buf, "y") == 0 || strcasecmp(buf, "yes") == 0 || 805 strcasecmp(buf, "yep") == 0 || strcasecmp(buf, "tottakai") == 0) { 806 rumpsysctl = true; 807 return; 808 } 809 if (strcasecmp(buf, "n") == 0 || strcasecmp(buf, "no") == 0) { 810 rumpsysctl = false; 811 return; 812 } 813 814 errx(1, "sysctl value should be y(es)/n(o), gave: %s", buf); 815 } 816 817 static void 818 fdoffparser(char *buf) 819 { 820 unsigned long fdoff; 821 char *ep; 822 823 if (*buf == '-') { 824 errx(1, "fdoff must not be negative"); 825 } 826 fdoff = strtoul(buf, &ep, 10); 827 if (*ep != '\0') 828 errx(1, "invalid fdoff specifier \"%s\"", buf); 829 if (fdoff >= INT_MAX/2 || fdoff < 3) 830 errx(1, "fdoff out of range"); 831 hijack_fdoff = fdoff; 832 } 833 834 static struct { 835 void (*parsefn)(char *); 836 const char *name; 837 bool needvalues; 838 } hijackparse[] = { 839 { sockparser, "socket", true }, 840 { pathparser, "path", true }, 841 { blanketparser, "blanket", true }, 842 { vfsparser, "vfs", true }, 843 { sysctlparser, "sysctl", false }, 844 { fdoffparser, "fdoff", true }, 845 { NULL, NULL, false }, 846 }; 847 848 static void 849 parsehijack(char *hijack) 850 { 851 char *p, *p2, *l; 852 const char *hijackcopy; 853 bool nop2; 854 int i; 855 856 if ((hijackcopy = strdup(hijack)) == NULL) 857 err(1, "strdup"); 858 859 /* disable everything explicitly */ 860 for (i = 0; i < PF_MAX; i++) 861 rumpsockets[i] = false; 862 863 for (p = strtok_r(hijack, ",", &l); p; p = strtok_r(NULL, ",", &l)) { 864 nop2 = false; 865 p2 = strchr(p, '='); 866 if (!p2) { 867 nop2 = true; 868 p2 = p + strlen(p); 869 } 870 871 for (i = 0; hijackparse[i].parsefn; i++) { 872 if (strncmp(hijackparse[i].name, p, 873 (size_t)(p2-p)) == 0) { 874 if (nop2 && hijackparse[i].needvalues) 875 errx(1, "invalid hijack specifier: %s", 876 hijackcopy); 877 hijackparse[i].parsefn(nop2 ? NULL : p2+1); 878 break; 879 } 880 } 881 882 if (hijackparse[i].parsefn == NULL) 883 errx(1, "invalid hijack specifier name in %s", p); 884 } 885 886 } 887 888 static void __attribute__((constructor)) 889 rcinit(void) 890 { 891 char buf[1024]; 892 unsigned i, j; 893 894 host_fork = dlsym(RTLD_NEXT, "fork"); 895 host_daemon = dlsym(RTLD_NEXT, "daemon"); 896 if (host_mmap == NULL) 897 host_mmap = dlsym(RTLD_NEXT, "mmap"); 898 899 /* 900 * In theory cannot print anything during lookups because 901 * we might not have the call vector set up. so, the errx() 902 * is a bit of a strech, but it might work. 903 */ 904 905 for (i = 0; i < DUALCALL__NUM; i++) { 906 /* build runtime O(1) access */ 907 for (j = 0; j < __arraycount(syscnames); j++) { 908 if (syscnames[j].scm_callnum == i) 909 break; 910 } 911 912 if (j == __arraycount(syscnames)) 913 errx(1, "rumphijack error: syscall pos %d missing", i); 914 915 syscalls[i].bs_host = dlsym(RTLD_NEXT, 916 syscnames[j].scm_hostname); 917 if (syscalls[i].bs_host == NULL) 918 errx(1, "hostcall %s not found!", 919 syscnames[j].scm_hostname); 920 921 syscalls[i].bs_rump = dlsym(RTLD_NEXT, 922 syscnames[j].scm_rumpname); 923 if (syscalls[i].bs_rump == NULL) 924 errx(1, "rumpcall %s not found!", 925 syscnames[j].scm_rumpname); 926 } 927 928 if (rumpclient_init() == -1) 929 err(1, "rumpclient init"); 930 931 /* check which syscalls we're supposed to hijack */ 932 if (getenv_r("RUMPHIJACK", buf, sizeof(buf)) == -1) { 933 strcpy(buf, RUMPHIJACK_DEFAULT); 934 } 935 parsehijack(buf); 936 937 /* set client persistence level */ 938 if (getenv_r("RUMPHIJACK_RETRYCONNECT", buf, sizeof(buf)) != -1) { 939 if (strcmp(buf, "die") == 0) 940 rumpclient_setconnretry(RUMPCLIENT_RETRYCONN_DIE); 941 else if (strcmp(buf, "inftime") == 0) 942 rumpclient_setconnretry(RUMPCLIENT_RETRYCONN_INFTIME); 943 else if (strcmp(buf, "once") == 0) 944 rumpclient_setconnretry(RUMPCLIENT_RETRYCONN_ONCE); 945 else { 946 time_t timeout; 947 char *ep; 948 949 timeout = (time_t)strtoll(buf, &ep, 10); 950 if (timeout <= 0 || ep != buf + strlen(buf)) 951 errx(1, "RUMPHIJACK_RETRYCONNECT must be " 952 "keyword or integer, got: %s", buf); 953 954 rumpclient_setconnretry(timeout); 955 } 956 } 957 958 if (getenv_r("RUMPHIJACK__DUP2INFO", buf, sizeof(buf)) == 0) { 959 if (sscanf(buf, "%u,%u,%u", 960 &dup2vec[0], &dup2vec[1], &dup2vec[2]) != 3) { 961 warnx("invalid dup2mask: %s", buf); 962 memset(dup2vec, 0, sizeof(dup2vec)); 963 } 964 unsetenv("RUMPHIJACK__DUP2INFO"); 965 } 966 if (getenv_r("RUMPHIJACK__PWDINRUMP", buf, sizeof(buf)) == 0) { 967 pwdinrump = true; 968 unsetenv("RUMPHIJACK__PWDINRUMP"); 969 } 970 } 971 972 static int 973 fd_rump2host(int fd) 974 { 975 976 if (fd == -1) 977 return fd; 978 return fd + hijack_fdoff; 979 } 980 981 static int 982 fd_rump2host_withdup(int fd) 983 { 984 int hfd; 985 986 _DIAGASSERT(fd != -1); 987 hfd = unmapdup2(fd); 988 if (hfd != -1) { 989 _DIAGASSERT(hfd <= DUP2HIGH); 990 return hfd; 991 } 992 return fd_rump2host(fd); 993 } 994 995 static int 996 fd_host2rump(int fd) 997 { 998 if (!isdup2d(fd)) 999 return fd - hijack_fdoff; 1000 else 1001 return mapdup2(fd); 1002 } 1003 1004 static bool 1005 fd_isrump(int fd) 1006 { 1007 1008 return isdup2d(fd) || fd >= hijack_fdoff; 1009 } 1010 1011 #define assertfd(_fd_) assert(ISDUP2D(_fd_) || (_fd_) >= hijack_fdoff) 1012 1013 static enum pathtype 1014 path_isrump(const char *path) 1015 { 1016 size_t plen; 1017 int i; 1018 1019 if (rumpprefix == NULL && nblanket == 0) 1020 return PATH_HOST; 1021 1022 if (*path == '/') { 1023 plen = strlen(path); 1024 if (rumpprefix && plen >= rumpprefixlen) { 1025 if (strncmp(path, rumpprefix, rumpprefixlen) == 0 1026 && (plen == rumpprefixlen 1027 || *(path + rumpprefixlen) == '/')) { 1028 return PATH_RUMP; 1029 } 1030 } 1031 for (i = 0; i < nblanket; i++) { 1032 if (strncmp(path, blanket[i].pfx, blanket[i].len) == 0) 1033 return PATH_RUMPBLANKET; 1034 } 1035 1036 return PATH_HOST; 1037 } else { 1038 return pwdinrump ? PATH_RUMP : PATH_HOST; 1039 } 1040 } 1041 1042 static const char *rootpath = "/"; 1043 static const char * 1044 path_host2rump(const char *path) 1045 { 1046 const char *rv; 1047 1048 if (*path == '/') { 1049 rv = path + rumpprefixlen; 1050 if (*rv == '\0') 1051 rv = rootpath; 1052 } else { 1053 rv = path; 1054 } 1055 1056 return rv; 1057 } 1058 1059 static int 1060 dodup(int oldd, int minfd) 1061 { 1062 int (*op_fcntl)(int, int, ...); 1063 int newd; 1064 int isrump; 1065 1066 DPRINTF(("dup -> %d (minfd %d)\n", oldd, minfd)); 1067 if (fd_isrump(oldd)) { 1068 op_fcntl = GETSYSCALL(rump, FCNTL); 1069 oldd = fd_host2rump(oldd); 1070 if (minfd >= hijack_fdoff) 1071 minfd -= hijack_fdoff; 1072 isrump = 1; 1073 } else { 1074 if (minfd >= hijack_fdoff) { 1075 errno = EINVAL; 1076 return -1; 1077 } 1078 op_fcntl = GETSYSCALL(host, FCNTL); 1079 isrump = 0; 1080 } 1081 1082 newd = op_fcntl(oldd, F_DUPFD, minfd); 1083 1084 if (isrump) 1085 newd = fd_rump2host(newd); 1086 DPRINTF(("dup <- %d\n", newd)); 1087 1088 return newd; 1089 } 1090 1091 /* 1092 * Check that host fd value does not exceed fdoffset and if necessary 1093 * dup the file descriptor so that it doesn't collide with the dup2mask. 1094 */ 1095 static int 1096 fd_host2host(int fd) 1097 { 1098 int (*op_fcntl)(int, int, ...) = GETSYSCALL(host, FCNTL); 1099 int (*op_close)(int) = GETSYSCALL(host, CLOSE); 1100 int ofd, i; 1101 1102 if (fd >= hijack_fdoff) { 1103 op_close(fd); 1104 errno = ENFILE; 1105 return -1; 1106 } 1107 1108 for (i = 1; isdup2d(fd); i++) { 1109 ofd = fd; 1110 fd = op_fcntl(ofd, F_DUPFD, i); 1111 op_close(ofd); 1112 } 1113 1114 return fd; 1115 } 1116 1117 int 1118 open(const char *path, int flags, ...) 1119 { 1120 int (*op_open)(const char *, int, ...); 1121 bool isrump; 1122 va_list ap; 1123 enum pathtype pt; 1124 int fd; 1125 1126 DPRINTF(("open -> %s (%s)\n", path, whichpath(path))); 1127 1128 if ((pt = path_isrump(path)) != PATH_HOST) { 1129 if (pt == PATH_RUMP) 1130 path = path_host2rump(path); 1131 op_open = GETSYSCALL(rump, OPEN); 1132 isrump = true; 1133 } else { 1134 op_open = GETSYSCALL(host, OPEN); 1135 isrump = false; 1136 } 1137 1138 va_start(ap, flags); 1139 fd = op_open(path, flags, va_arg(ap, mode_t)); 1140 va_end(ap); 1141 1142 if (isrump) 1143 fd = fd_rump2host(fd); 1144 else 1145 fd = fd_host2host(fd); 1146 1147 DPRINTF(("open <- %d (%s)\n", fd, whichfd(fd))); 1148 return fd; 1149 } 1150 1151 int 1152 chdir(const char *path) 1153 { 1154 int (*op_chdir)(const char *); 1155 enum pathtype pt; 1156 int rv; 1157 1158 if ((pt = path_isrump(path)) != PATH_HOST) { 1159 op_chdir = GETSYSCALL(rump, CHDIR); 1160 if (pt == PATH_RUMP) 1161 path = path_host2rump(path); 1162 } else { 1163 op_chdir = GETSYSCALL(host, CHDIR); 1164 } 1165 1166 rv = op_chdir(path); 1167 if (rv == 0) 1168 pwdinrump = pt != PATH_HOST; 1169 1170 return rv; 1171 } 1172 1173 int 1174 fchdir(int fd) 1175 { 1176 int (*op_fchdir)(int); 1177 bool isrump; 1178 int rv; 1179 1180 if (fd_isrump(fd)) { 1181 op_fchdir = GETSYSCALL(rump, FCHDIR); 1182 isrump = true; 1183 fd = fd_host2rump(fd); 1184 } else { 1185 op_fchdir = GETSYSCALL(host, FCHDIR); 1186 isrump = false; 1187 } 1188 1189 rv = op_fchdir(fd); 1190 if (rv == 0) { 1191 pwdinrump = isrump; 1192 } 1193 1194 return rv; 1195 } 1196 1197 #ifndef __linux__ 1198 int 1199 __getcwd(char *bufp, size_t len) 1200 { 1201 int (*op___getcwd)(char *, size_t); 1202 size_t prefixgap; 1203 bool iamslash; 1204 int rv; 1205 1206 if (pwdinrump && rumpprefix) { 1207 if (rumpprefix[rumpprefixlen-1] == '/') 1208 iamslash = true; 1209 else 1210 iamslash = false; 1211 1212 if (iamslash) 1213 prefixgap = rumpprefixlen - 1; /* ``//+path'' */ 1214 else 1215 prefixgap = rumpprefixlen; /* ``/pfx+/path'' */ 1216 if (len <= prefixgap) { 1217 errno = ERANGE; 1218 return -1; 1219 } 1220 1221 op___getcwd = GETSYSCALL(rump, __GETCWD); 1222 rv = op___getcwd(bufp + prefixgap, len - prefixgap); 1223 if (rv == -1) 1224 return rv; 1225 1226 /* augment the "/" part only for a non-root path */ 1227 memcpy(bufp, rumpprefix, rumpprefixlen); 1228 1229 /* append / only to non-root cwd */ 1230 if (rv != 2) 1231 bufp[prefixgap] = '/'; 1232 1233 /* don't append extra slash in the purely-slash case */ 1234 if (rv == 2 && !iamslash) 1235 bufp[rumpprefixlen] = '\0'; 1236 } else if (pwdinrump) { 1237 /* assume blanket. we can't provide a prefix here */ 1238 op___getcwd = GETSYSCALL(rump, __GETCWD); 1239 rv = op___getcwd(bufp, len); 1240 } else { 1241 op___getcwd = GETSYSCALL(host, __GETCWD); 1242 rv = op___getcwd(bufp, len); 1243 } 1244 1245 return rv; 1246 } 1247 #endif 1248 1249 static int 1250 moveish(const char *from, const char *to, 1251 int (*rump_op)(const char *, const char *), 1252 int (*host_op)(const char *, const char *)) 1253 { 1254 int (*op)(const char *, const char *); 1255 enum pathtype ptf, ptt; 1256 1257 if ((ptf = path_isrump(from)) != PATH_HOST) { 1258 if ((ptt = path_isrump(to)) == PATH_HOST) { 1259 errno = EXDEV; 1260 return -1; 1261 } 1262 1263 if (ptf == PATH_RUMP) 1264 from = path_host2rump(from); 1265 if (ptt == PATH_RUMP) 1266 to = path_host2rump(to); 1267 op = rump_op; 1268 } else { 1269 if (path_isrump(to) != PATH_HOST) { 1270 errno = EXDEV; 1271 return -1; 1272 } 1273 1274 op = host_op; 1275 } 1276 1277 return op(from, to); 1278 } 1279 1280 #ifdef __NetBSD__ 1281 int 1282 linkat(int fromfd, const char *from, int tofd, const char *to, int flags) 1283 { 1284 if (fromfd != AT_FDCWD || tofd != AT_FDCWD 1285 || flags != AT_SYMLINK_FOLLOW) 1286 return ENOSYS; 1287 1288 return moveish(from, to, 1289 GETSYSCALL(rump, LINK), GETSYSCALL(host, LINK)); 1290 } 1291 #endif 1292 1293 int 1294 link(const char *from, const char *to) 1295 { 1296 return moveish(from, to, 1297 GETSYSCALL(rump, LINK), GETSYSCALL(host, LINK)); 1298 } 1299 1300 int 1301 rename(const char *from, const char *to) 1302 { 1303 return moveish(from, to, 1304 GETSYSCALL(rump, RENAME), GETSYSCALL(host, RENAME)); 1305 } 1306 1307 int 1308 REALSOCKET(int domain, int type, int protocol) 1309 { 1310 int (*op_socket)(int, int, int); 1311 int fd; 1312 bool isrump; 1313 1314 isrump = domain < PF_MAX && rumpsockets[domain]; 1315 1316 if (isrump) 1317 op_socket = GETSYSCALL(rump, SOCKET); 1318 else 1319 op_socket = GETSYSCALL(host, SOCKET); 1320 fd = op_socket(domain, type, protocol); 1321 1322 if (isrump) 1323 fd = fd_rump2host(fd); 1324 else 1325 fd = fd_host2host(fd); 1326 DPRINTF(("socket <- %d\n", fd)); 1327 1328 return fd; 1329 } 1330 1331 int 1332 accept(int s, struct sockaddr *addr, socklen_t *addrlen) 1333 { 1334 int (*op_accept)(int, struct sockaddr *, socklen_t *); 1335 int fd; 1336 bool isrump; 1337 1338 isrump = fd_isrump(s); 1339 1340 DPRINTF(("accept -> %d", s)); 1341 if (isrump) { 1342 op_accept = GETSYSCALL(rump, ACCEPT); 1343 s = fd_host2rump(s); 1344 } else { 1345 op_accept = GETSYSCALL(host, ACCEPT); 1346 } 1347 fd = op_accept(s, addr, addrlen); 1348 if (fd != -1 && isrump) 1349 fd = fd_rump2host(fd); 1350 else 1351 fd = fd_host2host(fd); 1352 1353 DPRINTF((" <- %d\n", fd)); 1354 1355 return fd; 1356 } 1357 1358 int 1359 paccept(int s, struct sockaddr *addr, socklen_t *addrlen, 1360 const sigset_t * restrict sigmask, int flags) 1361 { 1362 int (*op_paccept)(int, struct sockaddr *, socklen_t *, 1363 const sigset_t * restrict, int); 1364 int fd; 1365 bool isrump; 1366 1367 isrump = fd_isrump(s); 1368 1369 DPRINTF(("paccept -> %d", s)); 1370 if (isrump) { 1371 op_paccept = GETSYSCALL(rump, PACCEPT); 1372 s = fd_host2rump(s); 1373 } else { 1374 op_paccept = GETSYSCALL(host, PACCEPT); 1375 } 1376 fd = op_paccept(s, addr, addrlen, sigmask, flags); 1377 if (fd != -1 && isrump) 1378 fd = fd_rump2host(fd); 1379 else 1380 fd = fd_host2host(fd); 1381 1382 DPRINTF((" <- %d\n", fd)); 1383 1384 return fd; 1385 } 1386 1387 /* 1388 * ioctl() and fcntl() are varargs calls and need special treatment. 1389 */ 1390 1391 /* 1392 * Various [Linux] libc's have various signatures for ioctl so we 1393 * need to handle the discrepancies. On NetBSD, we use the 1394 * one with unsigned long cmd. 1395 */ 1396 int 1397 #ifdef HAVE_IOCTL_CMD_INT 1398 ioctl(int fd, int cmd, ...) 1399 { 1400 int (*op_ioctl)(int, int cmd, ...); 1401 #else 1402 ioctl(int fd, unsigned long cmd, ...) 1403 { 1404 int (*op_ioctl)(int, unsigned long cmd, ...); 1405 #endif 1406 va_list ap; 1407 int rv; 1408 1409 DPRINTF(("ioctl -> %d (%s)\n", fd, whichfd(fd))); 1410 if (fd_isrump(fd)) { 1411 fd = fd_host2rump(fd); 1412 op_ioctl = GETSYSCALL(rump, IOCTL); 1413 } else { 1414 op_ioctl = GETSYSCALL(host, IOCTL); 1415 } 1416 1417 va_start(ap, cmd); 1418 rv = op_ioctl(fd, cmd, va_arg(ap, void *)); 1419 va_end(ap); 1420 DPRINTF(("ioctl <- %d\n", rv)); 1421 return rv; 1422 } 1423 1424 int 1425 fcntl(int fd, int cmd, ...) 1426 { 1427 int (*op_fcntl)(int, int, ...); 1428 va_list ap; 1429 int rv, minfd; 1430 1431 DPRINTF(("fcntl -> %d (cmd %d)\n", fd, cmd)); 1432 1433 switch (cmd) { 1434 case F_DUPFD_CLOEXEC: /* Ignore CLOEXEC bit for now */ 1435 case F_DUPFD: 1436 va_start(ap, cmd); 1437 minfd = va_arg(ap, int); 1438 va_end(ap); 1439 return dodup(fd, minfd); 1440 1441 #ifdef F_CLOSEM 1442 case F_CLOSEM: { 1443 int maxdup2, i; 1444 1445 /* 1446 * So, if fd < HIJACKOFF, we want to do a host closem. 1447 */ 1448 1449 if (fd < hijack_fdoff) { 1450 int closemfd = fd; 1451 1452 if (rumpclient__closenotify(&closemfd, 1453 RUMPCLIENT_CLOSE_FCLOSEM) == -1) 1454 return -1; 1455 op_fcntl = GETSYSCALL(host, FCNTL); 1456 rv = op_fcntl(closemfd, cmd); 1457 if (rv) 1458 return rv; 1459 } 1460 1461 /* 1462 * Additionally, we want to do a rump closem, but only 1463 * for the file descriptors not dup2'd. 1464 */ 1465 1466 for (i = 0, maxdup2 = -1; i <= DUP2HIGH; i++) { 1467 if (dup2vec[i] & DUP2BIT) { 1468 int val; 1469 1470 val = dup2vec[i] & DUP2FDMASK; 1471 maxdup2 = MAX(val, maxdup2); 1472 } 1473 } 1474 1475 if (fd >= hijack_fdoff) 1476 fd -= hijack_fdoff; 1477 else 1478 fd = 0; 1479 fd = MAX(maxdup2+1, fd); 1480 1481 /* hmm, maybe we should close rump fd's not within dup2mask? */ 1482 return rump_sys_fcntl(fd, F_CLOSEM); 1483 } 1484 #endif /* F_CLOSEM */ 1485 1486 #ifdef F_MAXFD 1487 case F_MAXFD: 1488 /* 1489 * For maxfd, if there's a rump kernel fd, return 1490 * it hostified. Otherwise, return host's MAXFD 1491 * return value. 1492 */ 1493 if ((rv = rump_sys_fcntl(fd, F_MAXFD)) != -1) { 1494 /* 1495 * This might go a little wrong in case 1496 * of dup2 to [012], but I'm not sure if 1497 * there's a justification for tracking 1498 * that info. Consider e.g. 1499 * dup2(rumpfd, 2) followed by rump_sys_open() 1500 * returning 1. We should return 1+HIJACKOFF, 1501 * not 2+HIJACKOFF. However, if [01] is not 1502 * open, the correct return value is 2. 1503 */ 1504 return fd_rump2host(fd); 1505 } else { 1506 op_fcntl = GETSYSCALL(host, FCNTL); 1507 return op_fcntl(fd, F_MAXFD); 1508 } 1509 /*NOTREACHED*/ 1510 #endif /* F_MAXFD */ 1511 1512 default: 1513 if (fd_isrump(fd)) { 1514 fd = fd_host2rump(fd); 1515 op_fcntl = GETSYSCALL(rump, FCNTL); 1516 } else { 1517 op_fcntl = GETSYSCALL(host, FCNTL); 1518 } 1519 1520 va_start(ap, cmd); 1521 rv = op_fcntl(fd, cmd, va_arg(ap, void *)); 1522 va_end(ap); 1523 return rv; 1524 } 1525 /*NOTREACHED*/ 1526 } 1527 1528 int 1529 close(int fd) 1530 { 1531 int (*op_close)(int); 1532 int rv; 1533 1534 DPRINTF(("close -> %d\n", fd)); 1535 if (fd_isrump(fd)) { 1536 bool undup2 = false; 1537 int ofd; 1538 1539 if (isdup2d(ofd = fd)) { 1540 undup2 = true; 1541 } 1542 1543 fd = fd_host2rump(fd); 1544 if (!undup2 && killdup2alias(fd)) { 1545 return 0; 1546 } 1547 1548 op_close = GETSYSCALL(rump, CLOSE); 1549 rv = op_close(fd); 1550 if (rv == 0 && undup2) { 1551 clrdup2(ofd); 1552 } 1553 } else { 1554 if (rumpclient__closenotify(&fd, RUMPCLIENT_CLOSE_CLOSE) == -1) 1555 return -1; 1556 op_close = GETSYSCALL(host, CLOSE); 1557 rv = op_close(fd); 1558 } 1559 1560 return rv; 1561 } 1562 1563 /* 1564 * write cannot issue a standard debug printf due to recursion 1565 */ 1566 ssize_t 1567 write(int fd, const void *buf, size_t blen) 1568 { 1569 ssize_t (*op_write)(int, const void *, size_t); 1570 1571 if (fd_isrump(fd)) { 1572 fd = fd_host2rump(fd); 1573 op_write = GETSYSCALL(rump, WRITE); 1574 } else { 1575 op_write = GETSYSCALL(host, WRITE); 1576 } 1577 1578 return op_write(fd, buf, blen); 1579 } 1580 1581 /* 1582 * file descriptor passing 1583 * 1584 * we intercept sendmsg and recvmsg to convert file descriptors in 1585 * control messages. an attempt to send a descriptor from a different kernel 1586 * is rejected. (ENOTSUP) 1587 */ 1588 1589 static int 1590 msg_convert(struct msghdr *msg, int (*func)(int)) 1591 { 1592 struct cmsghdr *cmsg; 1593 1594 for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; 1595 cmsg = CMSG_NXTHDR(msg, cmsg)) { 1596 if (cmsg->cmsg_level == SOL_SOCKET && 1597 cmsg->cmsg_type == SCM_RIGHTS) { 1598 int *fdp = (void *)CMSG_DATA(cmsg); 1599 const size_t size = 1600 cmsg->cmsg_len - __CMSG_ALIGN(sizeof(*cmsg)); 1601 const int nfds = (int)(size / sizeof(int)); 1602 const int * const efdp = fdp + nfds; 1603 1604 while (fdp < efdp) { 1605 const int newval = func(*fdp); 1606 1607 if (newval < 0) { 1608 return ENOTSUP; 1609 } 1610 *fdp = newval; 1611 fdp++; 1612 } 1613 } 1614 } 1615 return 0; 1616 } 1617 1618 ssize_t 1619 recvmsg(int fd, struct msghdr *msg, int flags) 1620 { 1621 ssize_t (*op_recvmsg)(int, struct msghdr *, int); 1622 ssize_t ret; 1623 const bool isrump = fd_isrump(fd); 1624 1625 if (isrump) { 1626 fd = fd_host2rump(fd); 1627 op_recvmsg = GETSYSCALL(rump, RECVMSG); 1628 } else { 1629 op_recvmsg = GETSYSCALL(host, RECVMSG); 1630 } 1631 ret = op_recvmsg(fd, msg, flags); 1632 if (ret == -1) { 1633 return ret; 1634 } 1635 /* 1636 * convert descriptors in the message. 1637 */ 1638 if (isrump) { 1639 msg_convert(msg, fd_rump2host); 1640 } else { 1641 msg_convert(msg, fd_host2host); 1642 } 1643 return ret; 1644 } 1645 1646 ssize_t 1647 recv(int fd, void *buf, size_t len, int flags) 1648 { 1649 1650 return recvfrom(fd, buf, len, flags, NULL, NULL); 1651 } 1652 1653 ssize_t 1654 send(int fd, const void *buf, size_t len, int flags) 1655 { 1656 1657 return sendto(fd, buf, len, flags, NULL, 0); 1658 } 1659 1660 static int 1661 fd_check_rump(int fd) 1662 { 1663 1664 return fd_isrump(fd) ? 0 : -1; 1665 } 1666 1667 static int 1668 fd_check_host(int fd) 1669 { 1670 1671 return !fd_isrump(fd) ? 0 : -1; 1672 } 1673 1674 ssize_t 1675 sendmsg(int fd, const struct msghdr *msg, int flags) 1676 { 1677 ssize_t (*op_sendmsg)(int, const struct msghdr *, int); 1678 const bool isrump = fd_isrump(fd); 1679 int error; 1680 1681 /* 1682 * reject descriptors from a different kernel. 1683 */ 1684 error = msg_convert(__UNCONST(msg), 1685 isrump ? fd_check_rump: fd_check_host); 1686 if (error != 0) { 1687 errno = error; 1688 return -1; 1689 } 1690 /* 1691 * convert descriptors in the message to raw values. 1692 */ 1693 if (isrump) { 1694 fd = fd_host2rump(fd); 1695 /* 1696 * XXX we directly modify the given message assuming: 1697 * - cmsg is writable (typically on caller's stack) 1698 * - caller don't care cmsg's contents after calling sendmsg. 1699 * (thus no need to restore values) 1700 * 1701 * it's safer to copy and modify instead. 1702 */ 1703 msg_convert(__UNCONST(msg), fd_host2rump); 1704 op_sendmsg = GETSYSCALL(rump, SENDMSG); 1705 } else { 1706 op_sendmsg = GETSYSCALL(host, SENDMSG); 1707 } 1708 return op_sendmsg(fd, msg, flags); 1709 } 1710 1711 /* 1712 * dup2 is special. we allow dup2 of a rump kernel fd to 0-2 since 1713 * many programs do that. dup2 of a rump kernel fd to another value 1714 * not >= fdoff is an error. 1715 * 1716 * Note: cannot rump2host newd, because it is often hardcoded. 1717 */ 1718 int 1719 dup2(int oldd, int newd) 1720 { 1721 int (*host_dup2)(int, int); 1722 int rv; 1723 1724 DPRINTF(("dup2 -> %d (o) -> %d (n)\n", oldd, newd)); 1725 1726 if (fd_isrump(oldd)) { 1727 int (*op_close)(int) = GETSYSCALL(host, CLOSE); 1728 1729 /* only allow fd 0-2 for cross-kernel dup */ 1730 if (!(newd >= 0 && newd <= 2 && !fd_isrump(newd))) { 1731 errno = EBADF; 1732 return -1; 1733 } 1734 1735 /* regular dup2? */ 1736 if (fd_isrump(newd)) { 1737 newd = fd_host2rump(newd); 1738 rv = rump_sys_dup2(oldd, newd); 1739 return fd_rump2host(rv); 1740 } 1741 1742 /* 1743 * dup2 rump => host? just establish an 1744 * entry in the mapping table. 1745 */ 1746 op_close(newd); 1747 setdup2(newd, fd_host2rump(oldd)); 1748 rv = 0; 1749 } else { 1750 host_dup2 = syscalls[DUALCALL_DUP2].bs_host; 1751 if (rumpclient__closenotify(&newd, RUMPCLIENT_CLOSE_DUP2) == -1) 1752 return -1; 1753 rv = host_dup2(oldd, newd); 1754 } 1755 1756 return rv; 1757 } 1758 1759 int 1760 dup(int oldd) 1761 { 1762 1763 return dodup(oldd, 0); 1764 } 1765 1766 pid_t 1767 fork(void) 1768 { 1769 pid_t rv; 1770 1771 DPRINTF(("fork\n")); 1772 1773 rv = rumpclient__dofork(host_fork); 1774 1775 DPRINTF(("fork returns %d\n", rv)); 1776 return rv; 1777 } 1778 #ifdef VFORK 1779 /* we do not have the luxury of not requiring a stackframe */ 1780 #define __strong_alias_macro(m, f) __strong_alias(m, f) 1781 __strong_alias_macro(VFORK,fork); 1782 #endif 1783 1784 int 1785 daemon(int nochdir, int noclose) 1786 { 1787 struct rumpclient_fork *rf; 1788 1789 if ((rf = rumpclient_prefork()) == NULL) 1790 return -1; 1791 1792 if (host_daemon(nochdir, noclose) == -1) 1793 return -1; 1794 1795 if (rumpclient_fork_init(rf) == -1) 1796 return -1; 1797 1798 return 0; 1799 } 1800 1801 int 1802 execve(const char *path, char *const argv[], char *const envp[]) 1803 { 1804 char buf[128]; 1805 char *dup2str; 1806 const char *pwdinrumpstr; 1807 char **newenv; 1808 size_t nelem; 1809 int rv, sverrno; 1810 int bonus = 2, i = 0; 1811 1812 snprintf(buf, sizeof(buf), "RUMPHIJACK__DUP2INFO=%u,%u,%u", 1813 dup2vec[0], dup2vec[1], dup2vec[2]); 1814 dup2str = strdup(buf); 1815 if (dup2str == NULL) { 1816 errno = ENOMEM; 1817 return -1; 1818 } 1819 1820 if (pwdinrump) { 1821 pwdinrumpstr = "RUMPHIJACK__PWDINRUMP=true"; 1822 bonus++; 1823 } else { 1824 pwdinrumpstr = NULL; 1825 } 1826 1827 for (nelem = 0; envp && envp[nelem]; nelem++) 1828 continue; 1829 newenv = malloc(sizeof(*newenv) * (nelem+bonus)); 1830 if (newenv == NULL) { 1831 free(dup2str); 1832 errno = ENOMEM; 1833 return -1; 1834 } 1835 memcpy(newenv, envp, nelem*sizeof(*newenv)); 1836 newenv[nelem+i] = dup2str; 1837 i++; 1838 1839 if (pwdinrumpstr) { 1840 newenv[nelem+i] = __UNCONST(pwdinrumpstr); 1841 i++; 1842 } 1843 newenv[nelem+i] = NULL; 1844 _DIAGASSERT(i < bonus); 1845 1846 rv = rumpclient_exec(path, argv, newenv); 1847 1848 _DIAGASSERT(rv != 0); 1849 sverrno = errno; 1850 free(newenv); 1851 free(dup2str); 1852 errno = sverrno; 1853 return rv; 1854 } 1855 1856 /* 1857 * select is done by calling poll. 1858 */ 1859 int 1860 REALSELECT(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, 1861 struct timeval *timeout) 1862 { 1863 struct pollfd *pfds; 1864 struct timespec ts, *tsp = NULL; 1865 nfds_t realnfds; 1866 int i, j; 1867 int rv, incr; 1868 1869 DPRINTF(("select %d %p %p %p %p\n", nfds, 1870 readfds, writefds, exceptfds, timeout)); 1871 1872 /* 1873 * Well, first we must scan the fds to figure out how many 1874 * fds there really are. This is because up to and including 1875 * nb5 poll() silently refuses nfds > process_maxopen_fds. 1876 * Seems to be fixed in current, thank the maker. 1877 * god damn cluster...bomb. 1878 */ 1879 1880 for (i = 0, realnfds = 0; i < nfds; i++) { 1881 if (readfds && FD_ISSET(i, readfds)) { 1882 realnfds++; 1883 continue; 1884 } 1885 if (writefds && FD_ISSET(i, writefds)) { 1886 realnfds++; 1887 continue; 1888 } 1889 if (exceptfds && FD_ISSET(i, exceptfds)) { 1890 realnfds++; 1891 continue; 1892 } 1893 } 1894 1895 if (realnfds) { 1896 pfds = calloc(realnfds, sizeof(*pfds)); 1897 if (!pfds) 1898 return -1; 1899 } else { 1900 pfds = NULL; 1901 } 1902 1903 for (i = 0, j = 0; i < nfds; i++) { 1904 incr = 0; 1905 if (readfds && FD_ISSET(i, readfds)) { 1906 pfds[j].fd = i; 1907 pfds[j].events |= POLLIN; 1908 incr=1; 1909 } 1910 if (writefds && FD_ISSET(i, writefds)) { 1911 pfds[j].fd = i; 1912 pfds[j].events |= POLLOUT; 1913 incr=1; 1914 } 1915 if (exceptfds && FD_ISSET(i, exceptfds)) { 1916 pfds[j].fd = i; 1917 pfds[j].events |= POLLHUP|POLLERR; 1918 incr=1; 1919 } 1920 if (incr) 1921 j++; 1922 } 1923 assert(j == (int)realnfds); 1924 1925 if (timeout) { 1926 TIMEVAL_TO_TIMESPEC(timeout, &ts); 1927 tsp = &ts; 1928 } 1929 rv = REALPOLLTS(pfds, realnfds, tsp, NULL); 1930 /* 1931 * "If select() returns with an error the descriptor sets 1932 * will be unmodified" 1933 */ 1934 if (rv < 0) 1935 goto out; 1936 1937 /* 1938 * zero out results (can't use FD_ZERO for the 1939 * obvious select-me-not reason). whee. 1940 * 1941 * We do this here since some software ignores the return 1942 * value of select, and hence if the timeout expires, it may 1943 * assume all input descriptors have activity. 1944 */ 1945 for (i = 0; i < nfds; i++) { 1946 if (readfds) 1947 FD_CLR(i, readfds); 1948 if (writefds) 1949 FD_CLR(i, writefds); 1950 if (exceptfds) 1951 FD_CLR(i, exceptfds); 1952 } 1953 if (rv == 0) 1954 goto out; 1955 1956 /* 1957 * We have >0 fds with activity. Harvest the results. 1958 */ 1959 for (i = 0; i < (int)realnfds; i++) { 1960 if (readfds) { 1961 if (pfds[i].revents & POLLIN) { 1962 FD_SET(pfds[i].fd, readfds); 1963 } 1964 } 1965 if (writefds) { 1966 if (pfds[i].revents & POLLOUT) { 1967 FD_SET(pfds[i].fd, writefds); 1968 } 1969 } 1970 if (exceptfds) { 1971 if (pfds[i].revents & (POLLHUP|POLLERR)) { 1972 FD_SET(pfds[i].fd, exceptfds); 1973 } 1974 } 1975 } 1976 1977 out: 1978 free(pfds); 1979 return rv; 1980 } 1981 1982 static void 1983 checkpoll(struct pollfd *fds, nfds_t nfds, int *hostcall, int *rumpcall) 1984 { 1985 nfds_t i; 1986 1987 for (i = 0; i < nfds; i++) { 1988 if (fds[i].fd == -1) 1989 continue; 1990 1991 if (fd_isrump(fds[i].fd)) 1992 (*rumpcall)++; 1993 else 1994 (*hostcall)++; 1995 } 1996 } 1997 1998 static void 1999 adjustpoll(struct pollfd *fds, nfds_t nfds, int (*fdadj)(int)) 2000 { 2001 nfds_t i; 2002 2003 for (i = 0; i < nfds; i++) { 2004 fds[i].fd = fdadj(fds[i].fd); 2005 } 2006 } 2007 2008 /* 2009 * poll is easy as long as the call comes in the fds only in one 2010 * kernel. otherwise its quite tricky... 2011 */ 2012 struct pollarg { 2013 struct pollfd *pfds; 2014 nfds_t nfds; 2015 const struct timespec *ts; 2016 const sigset_t *sigmask; 2017 int pipefd; 2018 int errnum; 2019 }; 2020 2021 static void * 2022 hostpoll(void *arg) 2023 { 2024 int (*op_pollts)(struct pollfd *, nfds_t, const struct timespec *, 2025 const sigset_t *); 2026 struct pollarg *parg = arg; 2027 intptr_t rv; 2028 2029 op_pollts = GETSYSCALL(host, POLLTS); 2030 rv = op_pollts(parg->pfds, parg->nfds, parg->ts, parg->sigmask); 2031 if (rv == -1) 2032 parg->errnum = errno; 2033 rump_sys_write(parg->pipefd, &rv, sizeof(rv)); 2034 2035 return (void *)rv; 2036 } 2037 2038 int 2039 REALPOLLTS(struct pollfd *fds, nfds_t nfds, const struct timespec *ts, 2040 const sigset_t *sigmask) 2041 { 2042 int (*op_pollts)(struct pollfd *, nfds_t, const struct timespec *, 2043 const sigset_t *); 2044 int (*host_close)(int); 2045 int hostcall = 0, rumpcall = 0; 2046 pthread_t pt; 2047 nfds_t i; 2048 int rv; 2049 2050 DPRINTF(("poll %p %d %p %p\n", fds, (int)nfds, ts, sigmask)); 2051 checkpoll(fds, nfds, &hostcall, &rumpcall); 2052 2053 if (hostcall && rumpcall) { 2054 struct pollfd *pfd_host = NULL, *pfd_rump = NULL; 2055 int rpipe[2] = {-1,-1}, hpipe[2] = {-1,-1}; 2056 struct pollarg parg; 2057 void *trv_val; 2058 int sverrno = 0, rv_rump, rv_host, errno_rump, errno_host; 2059 2060 /* 2061 * ok, this is where it gets tricky. We must support 2062 * this since it's a very common operation in certain 2063 * types of software (telnet, netcat, etc). We allocate 2064 * two vectors and run two poll commands in separate 2065 * threads. Whichever returns first "wins" and the 2066 * other kernel's fds won't show activity. 2067 */ 2068 rv = -1; 2069 2070 /* allocate full vector for O(n) joining after call */ 2071 pfd_host = malloc(sizeof(*pfd_host)*(nfds+1)); 2072 if (!pfd_host) 2073 goto out; 2074 pfd_rump = malloc(sizeof(*pfd_rump)*(nfds+1)); 2075 if (!pfd_rump) { 2076 goto out; 2077 } 2078 2079 /* 2080 * then, open two pipes, one for notifications 2081 * to each kernel. 2082 * 2083 * At least the rump pipe should probably be 2084 * cached, along with the helper threads. This 2085 * should give a microbenchmark improvement (haven't 2086 * experienced a macro-level problem yet, though). 2087 */ 2088 if ((rv = rump_sys_pipe(rpipe)) == -1) { 2089 sverrno = errno; 2090 } 2091 if (rv == 0 && (rv = pipe(hpipe)) == -1) { 2092 sverrno = errno; 2093 } 2094 2095 /* split vectors (or signal errors) */ 2096 for (i = 0; i < nfds; i++) { 2097 int fd; 2098 2099 fds[i].revents = 0; 2100 if (fds[i].fd == -1) { 2101 pfd_host[i].fd = -1; 2102 pfd_rump[i].fd = -1; 2103 } else if (fd_isrump(fds[i].fd)) { 2104 pfd_host[i].fd = -1; 2105 fd = fd_host2rump(fds[i].fd); 2106 if (fd == rpipe[0] || fd == rpipe[1]) { 2107 fds[i].revents = POLLNVAL; 2108 if (rv != -1) 2109 rv++; 2110 } 2111 pfd_rump[i].fd = fd; 2112 pfd_rump[i].events = fds[i].events; 2113 } else { 2114 pfd_rump[i].fd = -1; 2115 fd = fds[i].fd; 2116 if (fd == hpipe[0] || fd == hpipe[1]) { 2117 fds[i].revents = POLLNVAL; 2118 if (rv != -1) 2119 rv++; 2120 } 2121 pfd_host[i].fd = fd; 2122 pfd_host[i].events = fds[i].events; 2123 } 2124 pfd_rump[i].revents = pfd_host[i].revents = 0; 2125 } 2126 if (rv) { 2127 goto out; 2128 } 2129 2130 pfd_host[nfds].fd = hpipe[0]; 2131 pfd_host[nfds].events = POLLIN; 2132 pfd_rump[nfds].fd = rpipe[0]; 2133 pfd_rump[nfds].events = POLLIN; 2134 2135 /* 2136 * then, create a thread to do host part and meanwhile 2137 * do rump kernel part right here 2138 */ 2139 2140 parg.pfds = pfd_host; 2141 parg.nfds = nfds+1; 2142 parg.ts = ts; 2143 parg.sigmask = sigmask; 2144 parg.pipefd = rpipe[1]; 2145 pthread_create(&pt, NULL, hostpoll, &parg); 2146 2147 op_pollts = GETSYSCALL(rump, POLLTS); 2148 rv_rump = op_pollts(pfd_rump, nfds+1, ts, NULL); 2149 errno_rump = errno; 2150 write(hpipe[1], &rv, sizeof(rv)); 2151 pthread_join(pt, &trv_val); 2152 rv_host = (int)(intptr_t)trv_val; 2153 errno_host = parg.errnum; 2154 2155 /* strip cross-thread notification from real results */ 2156 if (rv_host > 0 && pfd_host[nfds].revents & POLLIN) { 2157 rv_host--; 2158 } 2159 if (rv_rump > 0 && pfd_rump[nfds].revents & POLLIN) { 2160 rv_rump--; 2161 } 2162 2163 /* then merge the results into what's reported to the caller */ 2164 if (rv_rump > 0 || rv_host > 0) { 2165 /* SUCCESS */ 2166 2167 rv = 0; 2168 if (rv_rump > 0) { 2169 for (i = 0; i < nfds; i++) { 2170 if (pfd_rump[i].fd != -1) 2171 fds[i].revents 2172 = pfd_rump[i].revents; 2173 } 2174 rv += rv_rump; 2175 } 2176 if (rv_host > 0) { 2177 for (i = 0; i < nfds; i++) { 2178 if (pfd_host[i].fd != -1) 2179 fds[i].revents 2180 = pfd_host[i].revents; 2181 } 2182 rv += rv_host; 2183 } 2184 assert(rv > 0); 2185 sverrno = 0; 2186 } else if (rv_rump == -1 || rv_host == -1) { 2187 /* ERROR */ 2188 2189 /* just pick one kernel at "random" */ 2190 rv = -1; 2191 if (rv_host == -1) { 2192 sverrno = errno_host; 2193 } else if (rv_rump == -1) { 2194 sverrno = errno_rump; 2195 } 2196 } else { 2197 /* TIMEOUT */ 2198 2199 rv = 0; 2200 assert(rv_rump == 0 && rv_host == 0); 2201 } 2202 2203 out: 2204 host_close = GETSYSCALL(host, CLOSE); 2205 if (rpipe[0] != -1) 2206 rump_sys_close(rpipe[0]); 2207 if (rpipe[1] != -1) 2208 rump_sys_close(rpipe[1]); 2209 if (hpipe[0] != -1) 2210 host_close(hpipe[0]); 2211 if (hpipe[1] != -1) 2212 host_close(hpipe[1]); 2213 free(pfd_host); 2214 free(pfd_rump); 2215 errno = sverrno; 2216 } else { 2217 if (hostcall) { 2218 op_pollts = GETSYSCALL(host, POLLTS); 2219 } else { 2220 op_pollts = GETSYSCALL(rump, POLLTS); 2221 adjustpoll(fds, nfds, fd_host2rump); 2222 } 2223 2224 rv = op_pollts(fds, nfds, ts, sigmask); 2225 if (rumpcall) 2226 adjustpoll(fds, nfds, fd_rump2host_withdup); 2227 } 2228 2229 return rv; 2230 } 2231 2232 int 2233 poll(struct pollfd *fds, nfds_t nfds, int timeout) 2234 { 2235 struct timespec ts; 2236 struct timespec *tsp = NULL; 2237 2238 if (timeout != INFTIM) { 2239 ts.tv_sec = timeout / 1000; 2240 ts.tv_nsec = (timeout % 1000) * 1000*1000; 2241 2242 tsp = &ts; 2243 } 2244 2245 return REALPOLLTS(fds, nfds, tsp, NULL); 2246 } 2247 2248 #ifdef HAVE_KQUEUE 2249 int 2250 REALKEVENT(int kq, const struct kevent *changelist, size_t nchanges, 2251 struct kevent *eventlist, size_t nevents, 2252 const struct timespec *timeout) 2253 { 2254 int (*op_kevent)(int, const struct kevent *, size_t, 2255 struct kevent *, size_t, const struct timespec *); 2256 const struct kevent *ev; 2257 size_t i; 2258 2259 /* 2260 * Check that we don't attempt to kevent rump kernel fd's. 2261 * That needs similar treatment to select/poll, but is slightly 2262 * trickier since we need to manage to different kq descriptors. 2263 * (TODO, in case you're wondering). 2264 */ 2265 for (i = 0; i < nchanges; i++) { 2266 ev = &changelist[i]; 2267 if (ev->filter == EVFILT_READ || ev->filter == EVFILT_WRITE || 2268 ev->filter == EVFILT_VNODE) { 2269 if (fd_isrump((int)ev->ident)) { 2270 errno = ENOTSUP; 2271 return -1; 2272 } 2273 } 2274 } 2275 2276 op_kevent = GETSYSCALL(host, KEVENT); 2277 return op_kevent(kq, changelist, nchanges, eventlist, nevents, timeout); 2278 } 2279 #endif /* HAVE_KQUEUE */ 2280 2281 /* 2282 * mmapping from a rump kernel is not supported, so disallow it. 2283 */ 2284 void * 2285 mmap(void *addr, size_t len, int prot, int flags, int fd, off_t offset) 2286 { 2287 2288 if (flags & MAP_FILE && fd_isrump(fd)) { 2289 errno = ENOSYS; 2290 return MAP_FAILED; 2291 } 2292 if (__predict_false(host_mmap == NULL)) { 2293 host_mmap = rumphijack_dlsym(RTLD_NEXT, "mmap"); 2294 } 2295 return host_mmap(addr, len, prot, flags, fd, offset); 2296 } 2297 2298 #ifdef __NetBSD__ 2299 /* 2300 * these go to one or the other on a per-process configuration 2301 */ 2302 int __sysctl(const int *, unsigned int, void *, size_t *, const void *, size_t); 2303 int 2304 __sysctl(const int *name, unsigned int namelen, void *old, size_t *oldlenp, 2305 const void *new, size_t newlen) 2306 { 2307 int (*op___sysctl)(const int *, unsigned int, void *, size_t *, 2308 const void *, size_t); 2309 2310 if (rumpsysctl) { 2311 op___sysctl = GETSYSCALL(rump, __SYSCTL); 2312 } else { 2313 op___sysctl = GETSYSCALL(host, __SYSCTL); 2314 /* we haven't inited yet */ 2315 if (__predict_false(op___sysctl == NULL)) { 2316 op___sysctl = rumphijack_dlsym(RTLD_NEXT, "__sysctl"); 2317 } 2318 } 2319 2320 return op___sysctl(name, namelen, old, oldlenp, new, newlen); 2321 } 2322 #endif 2323 2324 /* 2325 * Rest are std type calls. 2326 */ 2327 2328 #ifdef HAVE_UTIMENSAT 2329 ATCALL(int, utimensat, DUALCALL_UTIMENSAT, \ 2330 (int fd, const char *path, const struct timespec t[2], int f), \ 2331 (int, const char *, const struct timespec [2], int), 2332 (fd, path, t, f)) 2333 #endif 2334 2335 FDCALL(int, bind, DUALCALL_BIND, \ 2336 (int fd, const struct sockaddr *name, socklen_t namelen), \ 2337 (int, const struct sockaddr *, socklen_t), \ 2338 (fd, name, namelen)) 2339 2340 FDCALL(int, connect, DUALCALL_CONNECT, \ 2341 (int fd, const struct sockaddr *name, socklen_t namelen), \ 2342 (int, const struct sockaddr *, socklen_t), \ 2343 (fd, name, namelen)) 2344 2345 FDCALL(int, getpeername, DUALCALL_GETPEERNAME, \ 2346 (int fd, struct sockaddr *name, socklen_t *namelen), \ 2347 (int, struct sockaddr *, socklen_t *), \ 2348 (fd, name, namelen)) 2349 2350 FDCALL(int, getsockname, DUALCALL_GETSOCKNAME, \ 2351 (int fd, struct sockaddr *name, socklen_t *namelen), \ 2352 (int, struct sockaddr *, socklen_t *), \ 2353 (fd, name, namelen)) 2354 2355 FDCALL(int, listen, DUALCALL_LISTEN, \ 2356 (int fd, int backlog), \ 2357 (int, int), \ 2358 (fd, backlog)) 2359 2360 FDCALL(ssize_t, recvfrom, DUALCALL_RECVFROM, \ 2361 (int fd, void *buf, size_t len, int flags, \ 2362 struct sockaddr *from, socklen_t *fromlen), \ 2363 (int, void *, size_t, int, struct sockaddr *, socklen_t *), \ 2364 (fd, buf, len, flags, from, fromlen)) 2365 2366 FDCALL(ssize_t, sendto, DUALCALL_SENDTO, \ 2367 (int fd, const void *buf, size_t len, int flags, \ 2368 const struct sockaddr *to, socklen_t tolen), \ 2369 (int, const void *, size_t, int, \ 2370 const struct sockaddr *, socklen_t), \ 2371 (fd, buf, len, flags, to, tolen)) 2372 2373 FDCALL(int, getsockopt, DUALCALL_GETSOCKOPT, \ 2374 (int fd, int level, int optn, void *optval, socklen_t *optlen), \ 2375 (int, int, int, void *, socklen_t *), \ 2376 (fd, level, optn, optval, optlen)) 2377 2378 FDCALL(int, setsockopt, DUALCALL_SETSOCKOPT, \ 2379 (int fd, int level, int optn, \ 2380 const void *optval, socklen_t optlen), \ 2381 (int, int, int, const void *, socklen_t), \ 2382 (fd, level, optn, optval, optlen)) 2383 2384 FDCALL(int, shutdown, DUALCALL_SHUTDOWN, \ 2385 (int fd, int how), \ 2386 (int, int), \ 2387 (fd, how)) 2388 2389 FDCALL(ssize_t, REALREAD, DUALCALL_READ, \ 2390 (int fd, void *buf, size_t buflen), \ 2391 (int, void *, size_t), \ 2392 (fd, buf, buflen)) 2393 2394 #ifdef __linux__ 2395 ssize_t __read_chk(int, void *, size_t) 2396 __attribute__((alias("read"))); 2397 #endif 2398 2399 FDCALL(ssize_t, readv, DUALCALL_READV, \ 2400 (int fd, const struct iovec *iov, int iovcnt), \ 2401 (int, const struct iovec *, int), \ 2402 (fd, iov, iovcnt)) 2403 2404 FDCALL(ssize_t, REALPREAD, DUALCALL_PREAD, \ 2405 (int fd, void *buf, size_t nbytes, off_t offset), \ 2406 (int, void *, size_t, off_t), \ 2407 (fd, buf, nbytes, offset)) 2408 2409 FDCALL(ssize_t, preadv, DUALCALL_PREADV, \ 2410 (int fd, const struct iovec *iov, int iovcnt, off_t offset), \ 2411 (int, const struct iovec *, int, off_t), \ 2412 (fd, iov, iovcnt, offset)) 2413 2414 FDCALL(ssize_t, writev, DUALCALL_WRITEV, \ 2415 (int fd, const struct iovec *iov, int iovcnt), \ 2416 (int, const struct iovec *, int), \ 2417 (fd, iov, iovcnt)) 2418 2419 FDCALL(ssize_t, REALPWRITE, DUALCALL_PWRITE, \ 2420 (int fd, const void *buf, size_t nbytes, off_t offset), \ 2421 (int, const void *, size_t, off_t), \ 2422 (fd, buf, nbytes, offset)) 2423 2424 FDCALL(ssize_t, pwritev, DUALCALL_PWRITEV, \ 2425 (int fd, const struct iovec *iov, int iovcnt, off_t offset), \ 2426 (int, const struct iovec *, int, off_t), \ 2427 (fd, iov, iovcnt, offset)) 2428 2429 #ifndef __linux__ 2430 FDCALL(int, REALFSTAT, DUALCALL_FSTAT, \ 2431 (int fd, struct stat *sb), \ 2432 (int, struct stat *), \ 2433 (fd, sb)) 2434 #endif 2435 2436 #ifdef __NetBSD__ 2437 FDCALL(int, fstatvfs1, DUALCALL_FSTATVFS1, \ 2438 (int fd, struct statvfs *buf, int flags), \ 2439 (int, struct statvfs *, int), \ 2440 (fd, buf, flags)) 2441 #endif 2442 2443 FDCALL(off_t, lseek, DUALCALL_LSEEK, \ 2444 (int fd, off_t offset, int whence), \ 2445 (int, off_t, int), \ 2446 (fd, offset, whence)) 2447 #ifdef LSEEK_ALIAS 2448 __strong_alias(LSEEK_ALIAS,lseek); 2449 #endif 2450 2451 #ifndef __linux__ 2452 FDCALL(int, REALGETDENTS, DUALCALL_GETDENTS, \ 2453 (int fd, char *buf, size_t nbytes), \ 2454 (int, char *, size_t), \ 2455 (fd, buf, nbytes)) 2456 #endif 2457 2458 FDCALL(int, fchown, DUALCALL_FCHOWN, \ 2459 (int fd, uid_t owner, gid_t group), \ 2460 (int, uid_t, gid_t), \ 2461 (fd, owner, group)) 2462 2463 FDCALL(int, fchmod, DUALCALL_FCHMOD, \ 2464 (int fd, mode_t mode), \ 2465 (int, mode_t), \ 2466 (fd, mode)) 2467 2468 FDCALL(int, ftruncate, DUALCALL_FTRUNCATE, \ 2469 (int fd, off_t length), \ 2470 (int, off_t), \ 2471 (fd, length)) 2472 2473 FDCALL(int, fsync, DUALCALL_FSYNC, \ 2474 (int fd), \ 2475 (int), \ 2476 (fd)) 2477 2478 #ifdef HAVE_FSYNC_RANGE 2479 FDCALL(int, fsync_range, DUALCALL_FSYNC_RANGE, \ 2480 (int fd, int how, off_t start, off_t length), \ 2481 (int, int, off_t, off_t), \ 2482 (fd, how, start, length)) 2483 #endif 2484 2485 FDCALL(int, futimes, DUALCALL_FUTIMES, \ 2486 (int fd, const struct timeval *tv), \ 2487 (int, const struct timeval *), \ 2488 (fd, tv)) 2489 2490 FDCALL(int, futimens, DUALCALL_FUTIMENS, \ 2491 (int fd, const struct timespec *ts), \ 2492 (int, const struct timespec *), \ 2493 (fd, ts)) 2494 2495 #ifdef HAVE_CHFLAGS 2496 FDCALL(int, fchflags, DUALCALL_FCHFLAGS, \ 2497 (int fd, u_long flags), \ 2498 (int, u_long), \ 2499 (fd, flags)) 2500 #endif 2501 2502 /* 2503 * path-based selectors 2504 */ 2505 2506 #ifndef __linux__ 2507 PATHCALL(int, REALSTAT, DUALCALL_STAT, \ 2508 (const char *path, struct stat *sb), \ 2509 (const char *, struct stat *), \ 2510 (path, sb)) 2511 2512 PATHCALL(int, REALLSTAT, DUALCALL_LSTAT, \ 2513 (const char *path, struct stat *sb), \ 2514 (const char *, struct stat *), \ 2515 (path, sb)) 2516 #endif 2517 2518 PATHCALL(int, chown, DUALCALL_CHOWN, \ 2519 (const char *path, uid_t owner, gid_t group), \ 2520 (const char *, uid_t, gid_t), \ 2521 (path, owner, group)) 2522 2523 PATHCALL(int, lchown, DUALCALL_LCHOWN, \ 2524 (const char *path, uid_t owner, gid_t group), \ 2525 (const char *, uid_t, gid_t), \ 2526 (path, owner, group)) 2527 2528 PATHCALL(int, chmod, DUALCALL_CHMOD, \ 2529 (const char *path, mode_t mode), \ 2530 (const char *, mode_t), \ 2531 (path, mode)) 2532 2533 PATHCALL(int, lchmod, DUALCALL_LCHMOD, \ 2534 (const char *path, mode_t mode), \ 2535 (const char *, mode_t), \ 2536 (path, mode)) 2537 2538 #ifdef __NetBSD__ 2539 PATHCALL(int, statvfs1, DUALCALL_STATVFS1, \ 2540 (const char *path, struct statvfs *buf, int flags), \ 2541 (const char *, struct statvfs *, int), \ 2542 (path, buf, flags)) 2543 #endif 2544 2545 PATHCALL(int, unlink, DUALCALL_UNLINK, \ 2546 (const char *path), \ 2547 (const char *), \ 2548 (path)) 2549 2550 PATHCALL(int, symlink, DUALCALL_SYMLINK, \ 2551 (const char *target, const char *path), \ 2552 (const char *, const char *), \ 2553 (target, path)) 2554 2555 /* 2556 * readlink() can be called from malloc which can be called 2557 * from dlsym() during init 2558 */ 2559 ssize_t 2560 readlink(const char *path, char *buf, size_t bufsiz) 2561 { 2562 int (*op_readlink)(const char *, char *, size_t); 2563 enum pathtype pt; 2564 2565 if ((pt = path_isrump(path)) != PATH_HOST) { 2566 op_readlink = GETSYSCALL(rump, READLINK); 2567 if (pt == PATH_RUMP) 2568 path = path_host2rump(path); 2569 } else { 2570 op_readlink = GETSYSCALL(host, READLINK); 2571 } 2572 2573 if (__predict_false(op_readlink == NULL)) { 2574 errno = ENOENT; 2575 return -1; 2576 } 2577 2578 return op_readlink(path, buf, bufsiz); 2579 } 2580 2581 PATHCALL(int, mkdir, DUALCALL_MKDIR, \ 2582 (const char *path, mode_t mode), \ 2583 (const char *, mode_t), \ 2584 (path, mode)) 2585 2586 PATHCALL(int, rmdir, DUALCALL_RMDIR, \ 2587 (const char *path), \ 2588 (const char *), \ 2589 (path)) 2590 2591 PATHCALL(int, utimes, DUALCALL_UTIMES, \ 2592 (const char *path, const struct timeval *tv), \ 2593 (const char *, const struct timeval *), \ 2594 (path, tv)) 2595 2596 PATHCALL(int, lutimes, DUALCALL_LUTIMES, \ 2597 (const char *path, const struct timeval *tv), \ 2598 (const char *, const struct timeval *), \ 2599 (path, tv)) 2600 2601 #ifdef HAVE_CHFLAGS 2602 PATHCALL(int, chflags, DUALCALL_CHFLAGS, \ 2603 (const char *path, u_long flags), \ 2604 (const char *, u_long), \ 2605 (path, flags)) 2606 2607 PATHCALL(int, lchflags, DUALCALL_LCHFLAGS, \ 2608 (const char *path, u_long flags), \ 2609 (const char *, u_long), \ 2610 (path, flags)) 2611 #endif /* HAVE_CHFLAGS */ 2612 2613 PATHCALL(int, truncate, DUALCALL_TRUNCATE, \ 2614 (const char *path, off_t length), \ 2615 (const char *, off_t), \ 2616 (path, length)) 2617 2618 PATHCALL(int, access, DUALCALL_ACCESS, \ 2619 (const char *path, int mode), \ 2620 (const char *, int), \ 2621 (path, mode)) 2622 2623 #ifndef __linux__ 2624 PATHCALL(int, REALMKNOD, DUALCALL_MKNOD, \ 2625 (const char *path, mode_t mode, dev_t dev), \ 2626 (const char *, mode_t, dev_t), \ 2627 (path, mode, dev)) 2628 #endif 2629 2630 /* 2631 * Note: with mount the decisive parameter is the mount 2632 * destination directory. This is because we don't really know 2633 * about the "source" directory in a generic call (and besides, 2634 * it might not even exist, cf. nfs). 2635 */ 2636 #ifdef __NetBSD__ 2637 PATHCALL(int, REALMOUNT, DUALCALL_MOUNT, \ 2638 (const char *type, const char *path, int flags, \ 2639 void *data, size_t dlen), \ 2640 (const char *, const char *, int, void *, size_t), \ 2641 (type, path, flags, data, dlen)) 2642 2643 PATHCALL(int, unmount, DUALCALL_UNMOUNT, \ 2644 (const char *path, int flags), \ 2645 (const char *, int), \ 2646 (path, flags)) 2647 #endif /* __NetBSD__ */ 2648 2649 #ifdef HAVE___QUOTACTL 2650 PATHCALL(int, __quotactl, DUALCALL_QUOTACTL, \ 2651 (const char *path, struct quotactl_args *args), \ 2652 (const char *, struct quotactl_args *), \ 2653 (path, args)) 2654 #endif /* HAVE___QUOTACTL */ 2655 2656 #ifdef __NetBSD__ 2657 PATHCALL(int, REALGETFH, DUALCALL_GETFH, \ 2658 (const char *path, void *fhp, size_t *fh_size), \ 2659 (const char *, void *, size_t *), \ 2660 (path, fhp, fh_size)) 2661 #endif 2662 2663 /* 2664 * These act different on a per-process vfs configuration 2665 */ 2666 2667 #ifdef __NetBSD__ 2668 VFSCALL(VFSBIT_GETVFSSTAT, int, getvfsstat, DUALCALL_GETVFSSTAT, \ 2669 (struct statvfs *buf, size_t buflen, int flags), \ 2670 (struct statvfs *, size_t, int), \ 2671 (buf, buflen, flags)) 2672 #endif 2673 2674 #ifdef __NetBSD__ 2675 VFSCALL(VFSBIT_FHCALLS, int, REALFHOPEN, DUALCALL_FHOPEN, \ 2676 (const void *fhp, size_t fh_size, int flags), \ 2677 (const char *, size_t, int), \ 2678 (fhp, fh_size, flags)) 2679 2680 VFSCALL(VFSBIT_FHCALLS, int, REALFHSTAT, DUALCALL_FHSTAT, \ 2681 (const void *fhp, size_t fh_size, struct stat *sb), \ 2682 (const char *, size_t, struct stat *), \ 2683 (fhp, fh_size, sb)) 2684 2685 VFSCALL(VFSBIT_FHCALLS, int, REALFHSTATVFS1, DUALCALL_FHSTATVFS1, \ 2686 (const void *fhp, size_t fh_size, struct statvfs *sb, int flgs),\ 2687 (const char *, size_t, struct statvfs *, int), \ 2688 (fhp, fh_size, sb, flgs)) 2689 #endif 2690 2691 2692 #ifdef __NetBSD__ 2693 2694 /* finally, put nfssvc here. "keep the namespace clean" */ 2695 #include <nfs/rpcv2.h> 2696 #include <nfs/nfs.h> 2697 2698 int 2699 nfssvc(int flags, void *argstructp) 2700 { 2701 int (*op_nfssvc)(int, void *); 2702 2703 if (vfsbits & VFSBIT_NFSSVC){ 2704 struct nfsd_args *nfsdargs; 2705 2706 /* massage the socket descriptor if necessary */ 2707 if (flags == NFSSVC_ADDSOCK) { 2708 nfsdargs = argstructp; 2709 nfsdargs->sock = fd_host2rump(nfsdargs->sock); 2710 } 2711 op_nfssvc = GETSYSCALL(rump, NFSSVC); 2712 } else 2713 op_nfssvc = GETSYSCALL(host, NFSSVC); 2714 2715 return op_nfssvc(flags, argstructp); 2716 } 2717 #endif /* __NetBSD__ */ 2718