1 /* $NetBSD: rumpuser_sp.c,v 1.59 2013/07/18 12:28:26 pooka Exp $ */ 2 3 /* 4 * Copyright (c) 2010, 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 * Sysproxy routines. This provides system RPC support over host sockets. 30 * The most notable limitation is that the client and server must share 31 * the same ABI. This does not mean that they have to be the same 32 * machine or that they need to run the same version of the host OS, 33 * just that they must agree on the data structures. This even *might* 34 * work correctly from one hardware architecture to another. 35 */ 36 37 #include "rumpuser_port.h" 38 39 #if !defined(lint) 40 __RCSID("$NetBSD: rumpuser_sp.c,v 1.59 2013/07/18 12:28:26 pooka Exp $"); 41 #endif /* !lint */ 42 43 #include <sys/types.h> 44 #include <sys/mman.h> 45 #include <sys/socket.h> 46 47 #include <arpa/inet.h> 48 #include <netinet/in.h> 49 #include <netinet/tcp.h> 50 51 #include <assert.h> 52 #include <errno.h> 53 #include <fcntl.h> 54 #include <poll.h> 55 #include <pthread.h> 56 #include <stdarg.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 62 #include <rump/rump.h> /* XXX: for rfork flags */ 63 #include <rump/rumpuser.h> 64 65 #include "rumpuser_int.h" 66 67 #include "sp_common.c" 68 69 #ifndef MAXCLI 70 #define MAXCLI 256 71 #endif 72 #ifndef MAXWORKER 73 #define MAXWORKER 128 74 #endif 75 #ifndef IDLEWORKER 76 #define IDLEWORKER 16 77 #endif 78 int rumpsp_maxworker = MAXWORKER; 79 int rumpsp_idleworker = IDLEWORKER; 80 81 static struct pollfd pfdlist[MAXCLI]; 82 static struct spclient spclist[MAXCLI]; 83 static unsigned int disco; 84 static volatile int spfini; 85 86 static char banner[MAXBANNER]; 87 88 #define PROTOMAJOR 0 89 #define PROTOMINOR 4 90 91 92 /* how to use atomic ops on Linux? */ 93 #if defined(__linux__) || defined(__CYGWIN__) 94 static pthread_mutex_t discomtx = PTHREAD_MUTEX_INITIALIZER; 95 96 static void 97 signaldisco(void) 98 { 99 100 pthread_mutex_lock(&discomtx); 101 disco++; 102 pthread_mutex_unlock(&discomtx); 103 } 104 105 static unsigned int 106 getdisco(void) 107 { 108 unsigned int discocnt; 109 110 pthread_mutex_lock(&discomtx); 111 discocnt = disco; 112 disco = 0; 113 pthread_mutex_unlock(&discomtx); 114 115 return discocnt; 116 } 117 118 #elif defined(__FreeBSD__) || defined(__DragonFly__) 119 120 #include <machine/atomic.h> 121 #define signaldisco() atomic_add_int(&disco, 1) 122 #define getdisco() atomic_readandclear_int(&disco) 123 124 #else /* NetBSD */ 125 126 #include <sys/atomic.h> 127 #define signaldisco() atomic_inc_uint(&disco) 128 #define getdisco() atomic_swap_uint(&disco, 0) 129 130 #endif 131 132 133 struct prefork { 134 uint32_t pf_auth[AUTHLEN]; 135 struct lwp *pf_lwp; 136 137 LIST_ENTRY(prefork) pf_entries; /* global list */ 138 LIST_ENTRY(prefork) pf_spcentries; /* linked from forking spc */ 139 }; 140 static LIST_HEAD(, prefork) preforks = LIST_HEAD_INITIALIZER(preforks); 141 static pthread_mutex_t pfmtx; 142 143 /* 144 * This version is for the server. It's optimized for multiple threads 145 * and is *NOT* reentrant wrt to signals. 146 */ 147 static int 148 waitresp(struct spclient *spc, struct respwait *rw) 149 { 150 int spcstate; 151 int rv = 0; 152 153 pthread_mutex_lock(&spc->spc_mtx); 154 sendunlockl(spc); 155 while (!rw->rw_done && spc->spc_state != SPCSTATE_DYING) { 156 pthread_cond_wait(&rw->rw_cv, &spc->spc_mtx); 157 } 158 TAILQ_REMOVE(&spc->spc_respwait, rw, rw_entries); 159 spcstate = spc->spc_state; 160 pthread_mutex_unlock(&spc->spc_mtx); 161 162 pthread_cond_destroy(&rw->rw_cv); 163 164 if (rv) 165 return rv; 166 if (spcstate == SPCSTATE_DYING) 167 return ENOTCONN; 168 return rw->rw_error; 169 } 170 171 /* 172 * Manual wrappers, since librump does not have access to the 173 * user namespace wrapped interfaces. 174 */ 175 176 static void 177 lwproc_switch(struct lwp *l) 178 { 179 180 rumpuser__hyp.hyp_schedule(); 181 rumpuser__hyp.hyp_lwproc_switch(l); 182 rumpuser__hyp.hyp_unschedule(); 183 } 184 185 static void 186 lwproc_release(void) 187 { 188 189 rumpuser__hyp.hyp_schedule(); 190 rumpuser__hyp.hyp_lwproc_release(); 191 rumpuser__hyp.hyp_unschedule(); 192 } 193 194 static int 195 lwproc_rfork(struct spclient *spc, int flags, const char *comm) 196 { 197 int rv; 198 199 rumpuser__hyp.hyp_schedule(); 200 rv = rumpuser__hyp.hyp_lwproc_rfork(spc, flags, comm); 201 rumpuser__hyp.hyp_unschedule(); 202 203 return rv; 204 } 205 206 static int 207 lwproc_newlwp(pid_t pid) 208 { 209 int rv; 210 211 rumpuser__hyp.hyp_schedule(); 212 rv = rumpuser__hyp.hyp_lwproc_newlwp(pid); 213 rumpuser__hyp.hyp_unschedule(); 214 215 return rv; 216 } 217 218 static struct lwp * 219 lwproc_curlwp(void) 220 { 221 struct lwp *l; 222 223 rumpuser__hyp.hyp_schedule(); 224 l = rumpuser__hyp.hyp_lwproc_curlwp(); 225 rumpuser__hyp.hyp_unschedule(); 226 227 return l; 228 } 229 230 static pid_t 231 lwproc_getpid(void) 232 { 233 pid_t p; 234 235 rumpuser__hyp.hyp_schedule(); 236 p = rumpuser__hyp.hyp_getpid(); 237 rumpuser__hyp.hyp_unschedule(); 238 239 return p; 240 } 241 242 static void 243 lwproc_execnotify(const char *comm) 244 { 245 246 rumpuser__hyp.hyp_schedule(); 247 rumpuser__hyp.hyp_execnotify(comm); 248 rumpuser__hyp.hyp_unschedule(); 249 } 250 251 static void 252 lwproc_lwpexit(void) 253 { 254 255 rumpuser__hyp.hyp_schedule(); 256 rumpuser__hyp.hyp_lwpexit(); 257 rumpuser__hyp.hyp_unschedule(); 258 } 259 260 static int 261 rumpsyscall(int sysnum, void *data, register_t *regrv) 262 { 263 long retval[2] = {0, 0}; 264 int rv; 265 266 rumpuser__hyp.hyp_schedule(); 267 rv = rumpuser__hyp.hyp_syscall(sysnum, data, retval); 268 rumpuser__hyp.hyp_unschedule(); 269 270 regrv[0] = retval[0]; 271 regrv[1] = retval[1]; 272 return rv; 273 } 274 275 static uint64_t 276 nextreq(struct spclient *spc) 277 { 278 uint64_t nw; 279 280 pthread_mutex_lock(&spc->spc_mtx); 281 nw = spc->spc_nextreq++; 282 pthread_mutex_unlock(&spc->spc_mtx); 283 284 return nw; 285 } 286 287 /* 288 * XXX: we send responses with "blocking" I/O. This is not 289 * ok for the main thread. XXXFIXME 290 */ 291 292 static void 293 send_error_resp(struct spclient *spc, uint64_t reqno, enum rumpsp_err error) 294 { 295 struct rsp_hdr rhdr; 296 struct iovec iov[1]; 297 298 rhdr.rsp_len = sizeof(rhdr); 299 rhdr.rsp_reqno = reqno; 300 rhdr.rsp_class = RUMPSP_ERROR; 301 rhdr.rsp_type = 0; 302 rhdr.rsp_error = error; 303 304 IOVPUT(iov[0], rhdr); 305 306 sendlock(spc); 307 (void)SENDIOV(spc, iov); 308 sendunlock(spc); 309 } 310 311 static int 312 send_handshake_resp(struct spclient *spc, uint64_t reqno, int error) 313 { 314 struct rsp_hdr rhdr; 315 struct iovec iov[2]; 316 int rv; 317 318 rhdr.rsp_len = sizeof(rhdr) + sizeof(error); 319 rhdr.rsp_reqno = reqno; 320 rhdr.rsp_class = RUMPSP_RESP; 321 rhdr.rsp_type = RUMPSP_HANDSHAKE; 322 rhdr.rsp_error = 0; 323 324 IOVPUT(iov[0], rhdr); 325 IOVPUT(iov[1], error); 326 327 sendlock(spc); 328 rv = SENDIOV(spc, iov); 329 sendunlock(spc); 330 331 return rv; 332 } 333 334 static int 335 send_syscall_resp(struct spclient *spc, uint64_t reqno, int error, 336 register_t *retval) 337 { 338 struct rsp_hdr rhdr; 339 struct rsp_sysresp sysresp; 340 struct iovec iov[2]; 341 int rv; 342 343 rhdr.rsp_len = sizeof(rhdr) + sizeof(sysresp); 344 rhdr.rsp_reqno = reqno; 345 rhdr.rsp_class = RUMPSP_RESP; 346 rhdr.rsp_type = RUMPSP_SYSCALL; 347 rhdr.rsp_sysnum = 0; 348 349 sysresp.rsys_error = error; 350 memcpy(sysresp.rsys_retval, retval, sizeof(sysresp.rsys_retval)); 351 352 IOVPUT(iov[0], rhdr); 353 IOVPUT(iov[1], sysresp); 354 355 sendlock(spc); 356 rv = SENDIOV(spc, iov); 357 sendunlock(spc); 358 359 return rv; 360 } 361 362 static int 363 send_prefork_resp(struct spclient *spc, uint64_t reqno, uint32_t *auth) 364 { 365 struct rsp_hdr rhdr; 366 struct iovec iov[2]; 367 int rv; 368 369 rhdr.rsp_len = sizeof(rhdr) + AUTHLEN*sizeof(*auth); 370 rhdr.rsp_reqno = reqno; 371 rhdr.rsp_class = RUMPSP_RESP; 372 rhdr.rsp_type = RUMPSP_PREFORK; 373 rhdr.rsp_sysnum = 0; 374 375 IOVPUT(iov[0], rhdr); 376 IOVPUT_WITHSIZE(iov[1], auth, AUTHLEN*sizeof(*auth)); 377 378 sendlock(spc); 379 rv = SENDIOV(spc, iov); 380 sendunlock(spc); 381 382 return rv; 383 } 384 385 static int 386 copyin_req(struct spclient *spc, const void *remaddr, size_t *dlen, 387 int wantstr, void **resp) 388 { 389 struct rsp_hdr rhdr; 390 struct rsp_copydata copydata; 391 struct respwait rw; 392 struct iovec iov[2]; 393 int rv; 394 395 DPRINTF(("copyin_req: %zu bytes from %p\n", *dlen, remaddr)); 396 397 rhdr.rsp_len = sizeof(rhdr) + sizeof(copydata); 398 rhdr.rsp_class = RUMPSP_REQ; 399 if (wantstr) 400 rhdr.rsp_type = RUMPSP_COPYINSTR; 401 else 402 rhdr.rsp_type = RUMPSP_COPYIN; 403 rhdr.rsp_sysnum = 0; 404 405 copydata.rcp_addr = __UNCONST(remaddr); 406 copydata.rcp_len = *dlen; 407 408 IOVPUT(iov[0], rhdr); 409 IOVPUT(iov[1], copydata); 410 411 putwait(spc, &rw, &rhdr); 412 rv = SENDIOV(spc, iov); 413 if (rv) { 414 unputwait(spc, &rw); 415 return rv; 416 } 417 418 rv = waitresp(spc, &rw); 419 420 DPRINTF(("copyin: response %d\n", rv)); 421 422 *resp = rw.rw_data; 423 if (wantstr) 424 *dlen = rw.rw_dlen; 425 426 return rv; 427 428 } 429 430 static int 431 send_copyout_req(struct spclient *spc, const void *remaddr, 432 const void *data, size_t dlen) 433 { 434 struct rsp_hdr rhdr; 435 struct rsp_copydata copydata; 436 struct iovec iov[3]; 437 int rv; 438 439 DPRINTF(("copyout_req (async): %zu bytes to %p\n", dlen, remaddr)); 440 441 rhdr.rsp_len = sizeof(rhdr) + sizeof(copydata) + dlen; 442 rhdr.rsp_reqno = nextreq(spc); 443 rhdr.rsp_class = RUMPSP_REQ; 444 rhdr.rsp_type = RUMPSP_COPYOUT; 445 rhdr.rsp_sysnum = 0; 446 447 copydata.rcp_addr = __UNCONST(remaddr); 448 copydata.rcp_len = dlen; 449 450 IOVPUT(iov[0], rhdr); 451 IOVPUT(iov[1], copydata); 452 IOVPUT_WITHSIZE(iov[2], __UNCONST(data), dlen); 453 454 sendlock(spc); 455 rv = SENDIOV(spc, iov); 456 sendunlock(spc); 457 458 return rv; 459 } 460 461 static int 462 anonmmap_req(struct spclient *spc, size_t howmuch, void **resp) 463 { 464 struct rsp_hdr rhdr; 465 struct respwait rw; 466 struct iovec iov[2]; 467 int rv; 468 469 DPRINTF(("anonmmap_req: %zu bytes\n", howmuch)); 470 471 rhdr.rsp_len = sizeof(rhdr) + sizeof(howmuch); 472 rhdr.rsp_class = RUMPSP_REQ; 473 rhdr.rsp_type = RUMPSP_ANONMMAP; 474 rhdr.rsp_sysnum = 0; 475 476 IOVPUT(iov[0], rhdr); 477 IOVPUT(iov[1], howmuch); 478 479 putwait(spc, &rw, &rhdr); 480 rv = SENDIOV(spc, iov); 481 if (rv) { 482 unputwait(spc, &rw); 483 return rv; 484 } 485 486 rv = waitresp(spc, &rw); 487 488 *resp = rw.rw_data; 489 490 DPRINTF(("anonmmap: mapped at %p\n", **(void ***)resp)); 491 492 return rv; 493 } 494 495 static int 496 send_raise_req(struct spclient *spc, int signo) 497 { 498 struct rsp_hdr rhdr; 499 struct iovec iov[1]; 500 int rv; 501 502 rhdr.rsp_len = sizeof(rhdr); 503 rhdr.rsp_class = RUMPSP_REQ; 504 rhdr.rsp_type = RUMPSP_RAISE; 505 rhdr.rsp_signo = signo; 506 507 IOVPUT(iov[0], rhdr); 508 509 sendlock(spc); 510 rv = SENDIOV(spc, iov); 511 sendunlock(spc); 512 513 return rv; 514 } 515 516 static void 517 spcref(struct spclient *spc) 518 { 519 520 pthread_mutex_lock(&spc->spc_mtx); 521 spc->spc_refcnt++; 522 pthread_mutex_unlock(&spc->spc_mtx); 523 } 524 525 static void 526 spcrelease(struct spclient *spc) 527 { 528 int ref; 529 530 pthread_mutex_lock(&spc->spc_mtx); 531 ref = --spc->spc_refcnt; 532 if (__predict_false(spc->spc_inexec && ref <= 2)) 533 pthread_cond_broadcast(&spc->spc_cv); 534 pthread_mutex_unlock(&spc->spc_mtx); 535 536 if (ref > 0) 537 return; 538 539 DPRINTF(("rump_sp: spcrelease: spc %p fd %d\n", spc, spc->spc_fd)); 540 541 _DIAGASSERT(TAILQ_EMPTY(&spc->spc_respwait)); 542 _DIAGASSERT(spc->spc_buf == NULL); 543 544 if (spc->spc_mainlwp) { 545 lwproc_switch(spc->spc_mainlwp); 546 lwproc_release(); 547 } 548 spc->spc_mainlwp = NULL; 549 550 close(spc->spc_fd); 551 spc->spc_fd = -1; 552 spc->spc_state = SPCSTATE_NEW; 553 554 signaldisco(); 555 } 556 557 static void 558 serv_handledisco(unsigned int idx) 559 { 560 struct spclient *spc = &spclist[idx]; 561 int dolwpexit; 562 563 DPRINTF(("rump_sp: disconnecting [%u]\n", idx)); 564 565 pfdlist[idx].fd = -1; 566 pfdlist[idx].revents = 0; 567 pthread_mutex_lock(&spc->spc_mtx); 568 spc->spc_state = SPCSTATE_DYING; 569 kickall(spc); 570 sendunlockl(spc); 571 /* exec uses mainlwp in another thread, but also nuked all lwps */ 572 dolwpexit = !spc->spc_inexec; 573 pthread_mutex_unlock(&spc->spc_mtx); 574 575 if (dolwpexit && spc->spc_mainlwp) { 576 lwproc_switch(spc->spc_mainlwp); 577 lwproc_lwpexit(); 578 lwproc_switch(NULL); 579 } 580 581 /* 582 * Nobody's going to attempt to send/receive anymore, 583 * so reinit info relevant to that. 584 */ 585 /*LINTED:pointer casts may be ok*/ 586 memset((char *)spc + SPC_ZEROFF, 0, sizeof(*spc) - SPC_ZEROFF); 587 588 spcrelease(spc); 589 } 590 591 static void 592 serv_shutdown(void) 593 { 594 struct spclient *spc; 595 unsigned int i; 596 597 for (i = 1; i < MAXCLI; i++) { 598 spc = &spclist[i]; 599 if (spc->spc_fd == -1) 600 continue; 601 602 shutdown(spc->spc_fd, SHUT_RDWR); 603 serv_handledisco(i); 604 605 spcrelease(spc); 606 } 607 } 608 609 static unsigned 610 serv_handleconn(int fd, connecthook_fn connhook, int busy) 611 { 612 struct sockaddr_storage ss; 613 socklen_t sl = sizeof(ss); 614 int newfd, flags; 615 unsigned i; 616 617 /*LINTED: cast ok */ 618 newfd = accept(fd, (struct sockaddr *)&ss, &sl); 619 if (newfd == -1) 620 return 0; 621 622 if (busy) { 623 close(newfd); /* EBUSY */ 624 return 0; 625 } 626 627 flags = fcntl(newfd, F_GETFL, 0); 628 if (fcntl(newfd, F_SETFL, flags | O_NONBLOCK) == -1) { 629 close(newfd); 630 return 0; 631 } 632 633 if (connhook(newfd) != 0) { 634 close(newfd); 635 return 0; 636 } 637 638 /* write out a banner for the client */ 639 if (send(newfd, banner, strlen(banner), MSG_NOSIGNAL) 640 != (ssize_t)strlen(banner)) { 641 close(newfd); 642 return 0; 643 } 644 645 /* find empty slot the simple way */ 646 for (i = 0; i < MAXCLI; i++) { 647 if (pfdlist[i].fd == -1 && spclist[i].spc_state == SPCSTATE_NEW) 648 break; 649 } 650 651 /* 652 * Although not finding a slot is impossible (cf. how this routine 653 * is called), the compiler can still think that i == MAXCLI 654 * if this code is either compiled with NDEBUG or the platform 655 * does not use __dead for assert(). Therefore, add an explicit 656 * check to avoid an array-bounds error. 657 */ 658 /* assert(i < MAXCLI); */ 659 if (i == MAXCLI) 660 abort(); 661 662 pfdlist[i].fd = newfd; 663 spclist[i].spc_fd = newfd; 664 spclist[i].spc_istatus = SPCSTATUS_BUSY; /* dedicated receiver */ 665 spclist[i].spc_refcnt = 1; 666 667 TAILQ_INIT(&spclist[i].spc_respwait); 668 669 DPRINTF(("rump_sp: added new connection fd %d at idx %u\n", newfd, i)); 670 671 return i; 672 } 673 674 static void 675 serv_handlesyscall(struct spclient *spc, struct rsp_hdr *rhdr, uint8_t *data) 676 { 677 register_t retval[2] = {0, 0}; 678 int rv, sysnum; 679 680 sysnum = (int)rhdr->rsp_sysnum; 681 DPRINTF(("rump_sp: handling syscall %d from client %d\n", 682 sysnum, spc->spc_pid)); 683 684 if (__predict_false((rv = lwproc_newlwp(spc->spc_pid)) != 0)) { 685 retval[0] = -1; 686 send_syscall_resp(spc, rhdr->rsp_reqno, rv, retval); 687 return; 688 } 689 spc->spc_syscallreq = rhdr->rsp_reqno; 690 rv = rumpsyscall(sysnum, data, retval); 691 spc->spc_syscallreq = 0; 692 lwproc_release(); 693 694 DPRINTF(("rump_sp: got return value %d & %d/%d\n", 695 rv, retval[0], retval[1])); 696 697 send_syscall_resp(spc, rhdr->rsp_reqno, rv, retval); 698 } 699 700 static void 701 serv_handleexec(struct spclient *spc, struct rsp_hdr *rhdr, char *comm) 702 { 703 size_t commlen = rhdr->rsp_len - HDRSZ; 704 705 pthread_mutex_lock(&spc->spc_mtx); 706 /* one for the connection and one for us */ 707 while (spc->spc_refcnt > 2) 708 pthread_cond_wait(&spc->spc_cv, &spc->spc_mtx); 709 pthread_mutex_unlock(&spc->spc_mtx); 710 711 /* 712 * ok, all the threads are dead (or one is still alive and 713 * the connection is dead, in which case this doesn't matter 714 * very much). proceed with exec. 715 */ 716 717 /* ensure comm is 0-terminated */ 718 /* TODO: make sure it contains sensible chars? */ 719 comm[commlen] = '\0'; 720 721 lwproc_switch(spc->spc_mainlwp); 722 lwproc_execnotify(comm); 723 lwproc_switch(NULL); 724 725 pthread_mutex_lock(&spc->spc_mtx); 726 spc->spc_inexec = 0; 727 pthread_mutex_unlock(&spc->spc_mtx); 728 send_handshake_resp(spc, rhdr->rsp_reqno, 0); 729 } 730 731 enum sbatype { SBA_SYSCALL, SBA_EXEC }; 732 733 struct servbouncearg { 734 struct spclient *sba_spc; 735 struct rsp_hdr sba_hdr; 736 enum sbatype sba_type; 737 uint8_t *sba_data; 738 739 TAILQ_ENTRY(servbouncearg) sba_entries; 740 }; 741 static pthread_mutex_t sbamtx; 742 static pthread_cond_t sbacv; 743 static int nworker, idleworker, nwork; 744 static TAILQ_HEAD(, servbouncearg) wrklist = TAILQ_HEAD_INITIALIZER(wrklist); 745 746 /*ARGSUSED*/ 747 static void * 748 serv_workbouncer(void *arg) 749 { 750 struct servbouncearg *sba; 751 752 for (;;) { 753 pthread_mutex_lock(&sbamtx); 754 if (__predict_false(idleworker - nwork >= rumpsp_idleworker)) { 755 nworker--; 756 pthread_mutex_unlock(&sbamtx); 757 break; 758 } 759 idleworker++; 760 while (TAILQ_EMPTY(&wrklist)) { 761 _DIAGASSERT(nwork == 0); 762 pthread_cond_wait(&sbacv, &sbamtx); 763 } 764 idleworker--; 765 766 sba = TAILQ_FIRST(&wrklist); 767 TAILQ_REMOVE(&wrklist, sba, sba_entries); 768 nwork--; 769 pthread_mutex_unlock(&sbamtx); 770 771 if (__predict_true(sba->sba_type == SBA_SYSCALL)) { 772 serv_handlesyscall(sba->sba_spc, 773 &sba->sba_hdr, sba->sba_data); 774 } else { 775 _DIAGASSERT(sba->sba_type == SBA_EXEC); 776 serv_handleexec(sba->sba_spc, &sba->sba_hdr, 777 (char *)sba->sba_data); 778 } 779 spcrelease(sba->sba_spc); 780 free(sba->sba_data); 781 free(sba); 782 } 783 784 return NULL; 785 } 786 787 static int 788 sp_copyin(void *arg, const void *raddr, void *laddr, size_t *len, int wantstr) 789 { 790 struct spclient *spc = arg; 791 void *rdata = NULL; /* XXXuninit */ 792 int rv, nlocks; 793 794 rumpkern_unsched(&nlocks, NULL); 795 796 rv = copyin_req(spc, raddr, len, wantstr, &rdata); 797 if (rv) 798 goto out; 799 800 memcpy(laddr, rdata, *len); 801 free(rdata); 802 803 out: 804 rumpkern_sched(nlocks, NULL); 805 if (rv) 806 rv = EFAULT; 807 ET(rv); 808 } 809 810 int 811 rumpuser_sp_copyin(void *arg, const void *raddr, void *laddr, size_t len) 812 { 813 int rv; 814 815 rv = sp_copyin(arg, raddr, laddr, &len, 0); 816 ET(rv); 817 } 818 819 int 820 rumpuser_sp_copyinstr(void *arg, const void *raddr, void *laddr, size_t *len) 821 { 822 int rv; 823 824 rv = sp_copyin(arg, raddr, laddr, len, 1); 825 ET(rv); 826 } 827 828 static int 829 sp_copyout(void *arg, const void *laddr, void *raddr, size_t dlen) 830 { 831 struct spclient *spc = arg; 832 int nlocks, rv; 833 834 rumpkern_unsched(&nlocks, NULL); 835 rv = send_copyout_req(spc, raddr, laddr, dlen); 836 rumpkern_sched(nlocks, NULL); 837 838 if (rv) 839 rv = EFAULT; 840 ET(rv); 841 } 842 843 int 844 rumpuser_sp_copyout(void *arg, const void *laddr, void *raddr, size_t dlen) 845 { 846 int rv; 847 848 rv = sp_copyout(arg, laddr, raddr, dlen); 849 ET(rv); 850 } 851 852 int 853 rumpuser_sp_copyoutstr(void *arg, const void *laddr, void *raddr, size_t *dlen) 854 { 855 int rv; 856 857 rv = sp_copyout(arg, laddr, raddr, *dlen); 858 ET(rv); 859 } 860 861 int 862 rumpuser_sp_anonmmap(void *arg, size_t howmuch, void **addr) 863 { 864 struct spclient *spc = arg; 865 void *resp, *rdata; 866 int nlocks, rv; 867 868 rumpkern_unsched(&nlocks, NULL); 869 870 rv = anonmmap_req(spc, howmuch, &rdata); 871 if (rv) { 872 rv = EFAULT; 873 goto out; 874 } 875 876 resp = *(void **)rdata; 877 free(rdata); 878 879 if (resp == NULL) { 880 rv = ENOMEM; 881 } 882 883 *addr = resp; 884 885 out: 886 rumpkern_sched(nlocks, NULL); 887 ET(rv); 888 } 889 890 int 891 rumpuser_sp_raise(void *arg, int signo) 892 { 893 struct spclient *spc = arg; 894 int rv, nlocks; 895 896 rumpkern_unsched(&nlocks, NULL); 897 rv = send_raise_req(spc, signo); 898 rumpkern_sched(nlocks, NULL); 899 900 return rv; 901 } 902 903 static pthread_attr_t pattr_detached; 904 static void 905 schedulework(struct spclient *spc, enum sbatype sba_type) 906 { 907 struct servbouncearg *sba; 908 pthread_t pt; 909 uint64_t reqno; 910 int retries = 0; 911 912 reqno = spc->spc_hdr.rsp_reqno; 913 while ((sba = malloc(sizeof(*sba))) == NULL) { 914 if (nworker == 0 || retries > 10) { 915 send_error_resp(spc, reqno, RUMPSP_ERR_TRYAGAIN); 916 spcfreebuf(spc); 917 return; 918 } 919 /* slim chance of more memory? */ 920 usleep(10000); 921 } 922 923 sba->sba_spc = spc; 924 sba->sba_type = sba_type; 925 sba->sba_hdr = spc->spc_hdr; 926 sba->sba_data = spc->spc_buf; 927 spcresetbuf(spc); 928 929 spcref(spc); 930 931 pthread_mutex_lock(&sbamtx); 932 TAILQ_INSERT_TAIL(&wrklist, sba, sba_entries); 933 nwork++; 934 if (nwork <= idleworker) { 935 /* do we have a daemon's tool (i.e. idle threads)? */ 936 pthread_cond_signal(&sbacv); 937 } else if (nworker < rumpsp_maxworker) { 938 /* 939 * Else, need to create one 940 * (if we can, otherwise just expect another 941 * worker to pick up the syscall) 942 */ 943 if (pthread_create(&pt, &pattr_detached, 944 serv_workbouncer, NULL) == 0) { 945 nworker++; 946 } 947 } 948 pthread_mutex_unlock(&sbamtx); 949 } 950 951 /* 952 * 953 * Startup routines and mainloop for server. 954 * 955 */ 956 957 struct spservarg { 958 int sps_sock; 959 connecthook_fn sps_connhook; 960 }; 961 962 static void 963 handlereq(struct spclient *spc) 964 { 965 uint64_t reqno; 966 int error; 967 968 reqno = spc->spc_hdr.rsp_reqno; 969 if (__predict_false(spc->spc_state == SPCSTATE_NEW)) { 970 if (spc->spc_hdr.rsp_type != RUMPSP_HANDSHAKE) { 971 send_error_resp(spc, reqno, RUMPSP_ERR_AUTH); 972 shutdown(spc->spc_fd, SHUT_RDWR); 973 spcfreebuf(spc); 974 return; 975 } 976 977 if (spc->spc_hdr.rsp_handshake == HANDSHAKE_GUEST) { 978 char *comm = (char *)spc->spc_buf; 979 size_t commlen = spc->spc_hdr.rsp_len - HDRSZ; 980 981 /* ensure it's 0-terminated */ 982 /* XXX make sure it contains sensible chars? */ 983 comm[commlen] = '\0'; 984 985 if ((error = lwproc_rfork(spc, 986 RUMP_RFCFDG, comm)) != 0) { 987 shutdown(spc->spc_fd, SHUT_RDWR); 988 } 989 990 spcfreebuf(spc); 991 if (error) 992 return; 993 994 spc->spc_mainlwp = lwproc_curlwp(); 995 996 send_handshake_resp(spc, reqno, 0); 997 } else if (spc->spc_hdr.rsp_handshake == HANDSHAKE_FORK) { 998 struct lwp *tmpmain; 999 struct prefork *pf; 1000 struct handshake_fork *rfp; 1001 int cancel; 1002 1003 if (spc->spc_off-HDRSZ != sizeof(*rfp)) { 1004 send_error_resp(spc, reqno, 1005 RUMPSP_ERR_MALFORMED_REQUEST); 1006 shutdown(spc->spc_fd, SHUT_RDWR); 1007 spcfreebuf(spc); 1008 return; 1009 } 1010 1011 /*LINTED*/ 1012 rfp = (void *)spc->spc_buf; 1013 cancel = rfp->rf_cancel; 1014 1015 pthread_mutex_lock(&pfmtx); 1016 LIST_FOREACH(pf, &preforks, pf_entries) { 1017 if (memcmp(rfp->rf_auth, pf->pf_auth, 1018 sizeof(rfp->rf_auth)) == 0) { 1019 LIST_REMOVE(pf, pf_entries); 1020 LIST_REMOVE(pf, pf_spcentries); 1021 break; 1022 } 1023 } 1024 pthread_mutex_lock(&pfmtx); 1025 spcfreebuf(spc); 1026 1027 if (!pf) { 1028 send_error_resp(spc, reqno, 1029 RUMPSP_ERR_INVALID_PREFORK); 1030 shutdown(spc->spc_fd, SHUT_RDWR); 1031 return; 1032 } 1033 1034 tmpmain = pf->pf_lwp; 1035 free(pf); 1036 lwproc_switch(tmpmain); 1037 if (cancel) { 1038 lwproc_release(); 1039 shutdown(spc->spc_fd, SHUT_RDWR); 1040 return; 1041 } 1042 1043 /* 1044 * So, we forked already during "prefork" to save 1045 * the file descriptors from a parent exit 1046 * race condition. But now we need to fork 1047 * a second time since the initial fork has 1048 * the wrong spc pointer. (yea, optimize 1049 * interfaces some day if anyone cares) 1050 */ 1051 if ((error = lwproc_rfork(spc, 0, NULL)) != 0) { 1052 send_error_resp(spc, reqno, 1053 RUMPSP_ERR_RFORK_FAILED); 1054 shutdown(spc->spc_fd, SHUT_RDWR); 1055 lwproc_release(); 1056 return; 1057 } 1058 spc->spc_mainlwp = lwproc_curlwp(); 1059 lwproc_switch(tmpmain); 1060 lwproc_release(); 1061 lwproc_switch(spc->spc_mainlwp); 1062 1063 send_handshake_resp(spc, reqno, 0); 1064 } else { 1065 send_error_resp(spc, reqno, RUMPSP_ERR_AUTH); 1066 shutdown(spc->spc_fd, SHUT_RDWR); 1067 spcfreebuf(spc); 1068 return; 1069 } 1070 1071 spc->spc_pid = lwproc_getpid(); 1072 1073 DPRINTF(("rump_sp: handshake for client %p complete, pid %d\n", 1074 spc, spc->spc_pid)); 1075 1076 lwproc_switch(NULL); 1077 spc->spc_state = SPCSTATE_RUNNING; 1078 return; 1079 } 1080 1081 if (__predict_false(spc->spc_hdr.rsp_type == RUMPSP_PREFORK)) { 1082 struct prefork *pf; 1083 uint32_t auth[AUTHLEN]; 1084 size_t randlen; 1085 int inexec; 1086 1087 DPRINTF(("rump_sp: prefork handler executing for %p\n", spc)); 1088 spcfreebuf(spc); 1089 1090 pthread_mutex_lock(&spc->spc_mtx); 1091 inexec = spc->spc_inexec; 1092 pthread_mutex_unlock(&spc->spc_mtx); 1093 if (inexec) { 1094 send_error_resp(spc, reqno, RUMPSP_ERR_INEXEC); 1095 shutdown(spc->spc_fd, SHUT_RDWR); 1096 return; 1097 } 1098 1099 pf = malloc(sizeof(*pf)); 1100 if (pf == NULL) { 1101 send_error_resp(spc, reqno, RUMPSP_ERR_NOMEM); 1102 return; 1103 } 1104 1105 /* 1106 * Use client main lwp to fork. this is never used by 1107 * worker threads (except in exec, but we checked for that 1108 * above) so we can safely use it here. 1109 */ 1110 lwproc_switch(spc->spc_mainlwp); 1111 if ((error = lwproc_rfork(spc, RUMP_RFFDG, NULL)) != 0) { 1112 DPRINTF(("rump_sp: fork failed: %d (%p)\n",error, spc)); 1113 send_error_resp(spc, reqno, RUMPSP_ERR_RFORK_FAILED); 1114 lwproc_switch(NULL); 1115 free(pf); 1116 return; 1117 } 1118 1119 /* Ok, we have a new process context and a new curlwp */ 1120 rumpuser_getrandom(auth, sizeof(auth), 0, &randlen); 1121 memcpy(pf->pf_auth, auth, sizeof(pf->pf_auth)); 1122 pf->pf_lwp = lwproc_curlwp(); 1123 lwproc_switch(NULL); 1124 1125 pthread_mutex_lock(&pfmtx); 1126 LIST_INSERT_HEAD(&preforks, pf, pf_entries); 1127 LIST_INSERT_HEAD(&spc->spc_pflist, pf, pf_spcentries); 1128 pthread_mutex_unlock(&pfmtx); 1129 1130 DPRINTF(("rump_sp: prefork handler success %p\n", spc)); 1131 1132 send_prefork_resp(spc, reqno, auth); 1133 return; 1134 } 1135 1136 if (__predict_false(spc->spc_hdr.rsp_type == RUMPSP_HANDSHAKE)) { 1137 int inexec; 1138 1139 if (spc->spc_hdr.rsp_handshake != HANDSHAKE_EXEC) { 1140 send_error_resp(spc, reqno, 1141 RUMPSP_ERR_MALFORMED_REQUEST); 1142 shutdown(spc->spc_fd, SHUT_RDWR); 1143 spcfreebuf(spc); 1144 return; 1145 } 1146 1147 pthread_mutex_lock(&spc->spc_mtx); 1148 inexec = spc->spc_inexec; 1149 pthread_mutex_unlock(&spc->spc_mtx); 1150 if (inexec) { 1151 send_error_resp(spc, reqno, RUMPSP_ERR_INEXEC); 1152 shutdown(spc->spc_fd, SHUT_RDWR); 1153 spcfreebuf(spc); 1154 return; 1155 } 1156 1157 pthread_mutex_lock(&spc->spc_mtx); 1158 spc->spc_inexec = 1; 1159 pthread_mutex_unlock(&spc->spc_mtx); 1160 1161 /* 1162 * start to drain lwps. we will wait for it to finish 1163 * in another thread 1164 */ 1165 lwproc_switch(spc->spc_mainlwp); 1166 lwproc_lwpexit(); 1167 lwproc_switch(NULL); 1168 1169 /* 1170 * exec has to wait for lwps to drain, so finish it off 1171 * in another thread 1172 */ 1173 schedulework(spc, SBA_EXEC); 1174 return; 1175 } 1176 1177 if (__predict_false(spc->spc_hdr.rsp_type != RUMPSP_SYSCALL)) { 1178 send_error_resp(spc, reqno, RUMPSP_ERR_MALFORMED_REQUEST); 1179 spcfreebuf(spc); 1180 return; 1181 } 1182 1183 schedulework(spc, SBA_SYSCALL); 1184 } 1185 1186 static void * 1187 spserver(void *arg) 1188 { 1189 struct spservarg *sarg = arg; 1190 struct spclient *spc; 1191 unsigned idx; 1192 int seen; 1193 int rv; 1194 unsigned int nfds, maxidx; 1195 1196 for (idx = 0; idx < MAXCLI; idx++) { 1197 pfdlist[idx].fd = -1; 1198 pfdlist[idx].events = POLLIN; 1199 1200 spc = &spclist[idx]; 1201 pthread_mutex_init(&spc->spc_mtx, NULL); 1202 pthread_cond_init(&spc->spc_cv, NULL); 1203 spc->spc_fd = -1; 1204 } 1205 pfdlist[0].fd = spclist[0].spc_fd = sarg->sps_sock; 1206 pfdlist[0].events = POLLIN; 1207 nfds = 1; 1208 maxidx = 0; 1209 1210 pthread_attr_init(&pattr_detached); 1211 pthread_attr_setdetachstate(&pattr_detached, PTHREAD_CREATE_DETACHED); 1212 #if NOTYET 1213 pthread_attr_setstacksize(&pattr_detached, 32*1024); 1214 #endif 1215 1216 pthread_mutex_init(&sbamtx, NULL); 1217 pthread_cond_init(&sbacv, NULL); 1218 1219 DPRINTF(("rump_sp: server mainloop\n")); 1220 1221 for (;;) { 1222 int discoed; 1223 1224 /* g/c hangarounds (eventually) */ 1225 discoed = getdisco(); 1226 while (discoed--) { 1227 nfds--; 1228 idx = maxidx; 1229 while (idx) { 1230 if (pfdlist[idx].fd != -1) { 1231 maxidx = idx; 1232 break; 1233 } 1234 idx--; 1235 } 1236 DPRINTF(("rump_sp: set maxidx to [%u]\n", 1237 maxidx)); 1238 } 1239 1240 DPRINTF(("rump_sp: loop nfd %d\n", maxidx+1)); 1241 seen = 0; 1242 rv = poll(pfdlist, maxidx+1, INFTIM); 1243 assert(maxidx+1 <= MAXCLI); 1244 assert(rv != 0); 1245 if (rv == -1) { 1246 if (errno == EINTR) 1247 continue; 1248 fprintf(stderr, "rump_spserver: poll returned %d\n", 1249 errno); 1250 break; 1251 } 1252 1253 for (idx = 0; seen < rv && idx < MAXCLI; idx++) { 1254 if ((pfdlist[idx].revents & POLLIN) == 0) 1255 continue; 1256 1257 seen++; 1258 DPRINTF(("rump_sp: activity at [%u] %d/%d\n", 1259 idx, seen, rv)); 1260 if (idx > 0) { 1261 spc = &spclist[idx]; 1262 DPRINTF(("rump_sp: mainloop read [%u]\n", idx)); 1263 switch (readframe(spc)) { 1264 case 0: 1265 break; 1266 case -1: 1267 serv_handledisco(idx); 1268 break; 1269 default: 1270 switch (spc->spc_hdr.rsp_class) { 1271 case RUMPSP_RESP: 1272 kickwaiter(spc); 1273 break; 1274 case RUMPSP_REQ: 1275 handlereq(spc); 1276 break; 1277 default: 1278 send_error_resp(spc, 1279 spc->spc_hdr.rsp_reqno, 1280 RUMPSP_ERR_MALFORMED_REQUEST); 1281 spcfreebuf(spc); 1282 break; 1283 } 1284 break; 1285 } 1286 1287 } else { 1288 DPRINTF(("rump_sp: mainloop new connection\n")); 1289 1290 if (__predict_false(spfini)) { 1291 close(spclist[0].spc_fd); 1292 serv_shutdown(); 1293 goto out; 1294 } 1295 1296 idx = serv_handleconn(pfdlist[0].fd, 1297 sarg->sps_connhook, nfds == MAXCLI); 1298 if (idx) 1299 nfds++; 1300 if (idx > maxidx) 1301 maxidx = idx; 1302 DPRINTF(("rump_sp: maxid now %d\n", maxidx)); 1303 } 1304 } 1305 } 1306 1307 out: 1308 return NULL; 1309 } 1310 1311 static unsigned cleanupidx; 1312 static struct sockaddr *cleanupsa; 1313 int 1314 rumpuser_sp_init(const char *url, 1315 const char *ostype, const char *osrelease, const char *machine) 1316 { 1317 pthread_t pt; 1318 struct spservarg *sarg; 1319 struct sockaddr *sap; 1320 char *p; 1321 unsigned idx; 1322 int error, s; 1323 1324 p = strdup(url); 1325 if (p == NULL) { 1326 error = ENOMEM; 1327 goto out; 1328 } 1329 error = parseurl(p, &sap, &idx, 1); 1330 free(p); 1331 if (error) 1332 goto out; 1333 1334 snprintf(banner, sizeof(banner), "RUMPSP-%d.%d-%s-%s/%s\n", 1335 PROTOMAJOR, PROTOMINOR, ostype, osrelease, machine); 1336 1337 s = socket(parsetab[idx].domain, SOCK_STREAM, 0); 1338 if (s == -1) { 1339 error = errno; 1340 goto out; 1341 } 1342 1343 sarg = malloc(sizeof(*sarg)); 1344 if (sarg == NULL) { 1345 close(s); 1346 error = ENOMEM; 1347 goto out; 1348 } 1349 1350 sarg->sps_sock = s; 1351 sarg->sps_connhook = parsetab[idx].connhook; 1352 1353 cleanupidx = idx; 1354 cleanupsa = sap; 1355 1356 /* sloppy error recovery */ 1357 1358 /*LINTED*/ 1359 if (bind(s, sap, parsetab[idx].slen) == -1) { 1360 error = errno; 1361 fprintf(stderr, "rump_sp: server bind failed\n"); 1362 goto out; 1363 } 1364 1365 if (listen(s, MAXCLI) == -1) { 1366 error = errno; 1367 fprintf(stderr, "rump_sp: server listen failed\n"); 1368 goto out; 1369 } 1370 1371 if ((error = pthread_create(&pt, NULL, spserver, sarg)) != 0) { 1372 fprintf(stderr, "rump_sp: cannot create wrkr thread\n"); 1373 goto out; 1374 } 1375 pthread_detach(pt); 1376 1377 out: 1378 ET(error); 1379 } 1380 1381 void 1382 rumpuser_sp_fini(void *arg) 1383 { 1384 struct spclient *spc = arg; 1385 register_t retval[2] = {0, 0}; 1386 1387 if (spclist[0].spc_fd) { 1388 parsetab[cleanupidx].cleanup(cleanupsa); 1389 } 1390 1391 /* 1392 * stuff response into the socket, since this process is just 1393 * about to exit 1394 */ 1395 if (spc && spc->spc_syscallreq) 1396 send_syscall_resp(spc, spc->spc_syscallreq, 0, retval); 1397 1398 if (spclist[0].spc_fd) { 1399 shutdown(spclist[0].spc_fd, SHUT_RDWR); 1400 spfini = 1; 1401 } 1402 } 1403