sp_common.c revision 1.8
1 /* $NetBSD: sp_common.c,v 1.8 2010/11/24 17:00:10 pooka Exp $ */ 2 3 /* 4 * Copyright (c) 2010 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 * Common client/server sysproxy routines. #included. 30 */ 31 32 #include <sys/cdefs.h> 33 34 #include <sys/types.h> 35 #include <sys/mman.h> 36 #include <sys/queue.h> 37 #include <sys/socket.h> 38 #include <sys/un.h> 39 40 #include <arpa/inet.h> 41 #include <netinet/in.h> 42 #include <netinet/tcp.h> 43 44 #include <assert.h> 45 #include <errno.h> 46 #include <fcntl.h> 47 #include <poll.h> 48 #include <pthread.h> 49 #include <stdarg.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 //#define DEBUG 56 #ifdef DEBUG 57 #define DPRINTF(x) mydprintf x 58 static void 59 mydprintf(const char *fmt, ...) 60 { 61 va_list ap; 62 63 va_start(ap, fmt); 64 vfprintf(stderr, fmt, ap); 65 va_end(ap); 66 } 67 #else 68 #define DPRINTF(x) 69 #endif 70 71 /* 72 * Bah, I hate writing on-off-wire conversions in C 73 */ 74 75 enum { RUMPSP_REQ, RUMPSP_RESP }; 76 enum { RUMPSP_SYSCALL, RUMPSP_COPYIN, RUMPSP_COPYOUT, RUMPSP_ANONMMAP }; 77 78 struct rsp_hdr { 79 uint64_t rsp_len; 80 uint64_t rsp_reqno; 81 uint16_t rsp_class; 82 uint16_t rsp_type; 83 /* 84 * We want this structure 64bit-aligned for typecast fun, 85 * so might as well use the following for something. 86 */ 87 uint32_t rsp_sysnum; 88 }; 89 #define HDRSZ sizeof(struct rsp_hdr) 90 91 /* 92 * Data follows the header. We have two types of structured data. 93 */ 94 95 /* copyin/copyout */ 96 struct rsp_copydata { 97 size_t rcp_len; 98 void *rcp_addr; 99 uint8_t rcp_data[0]; 100 }; 101 102 /* syscall response */ 103 struct rsp_sysresp { 104 int rsys_error; 105 register_t rsys_retval[2]; 106 }; 107 108 struct respwait { 109 uint64_t rw_reqno; 110 void *rw_data; 111 size_t rw_dlen; 112 113 pthread_cond_t rw_cv; 114 115 TAILQ_ENTRY(respwait) rw_entries; 116 }; 117 118 struct spclient { 119 int spc_fd; 120 int spc_refcnt; 121 int spc_dying; 122 123 struct lwp *spc_mainlwp; 124 pid_t spc_pid; 125 126 struct pollfd *spc_pfd; 127 128 struct rsp_hdr spc_hdr; 129 uint8_t *spc_buf; 130 size_t spc_off; 131 132 pthread_mutex_t spc_mtx; 133 pthread_cond_t spc_cv; 134 135 uint64_t spc_nextreq; 136 int spc_ostatus, spc_istatus; 137 138 TAILQ_HEAD(, respwait) spc_respwait; 139 }; 140 #define SPCSTATUS_FREE 0 141 #define SPCSTATUS_BUSY 1 142 #define SPCSTATUS_WANTED 2 143 144 typedef int (*addrparse_fn)(const char *, struct sockaddr **, int); 145 typedef int (*connecthook_fn)(int); 146 147 static int readframe(struct spclient *); 148 static void handlereq(struct spclient *); 149 150 static void 151 sendlock(struct spclient *spc) 152 { 153 154 pthread_mutex_lock(&spc->spc_mtx); 155 while (spc->spc_ostatus != SPCSTATUS_FREE) { 156 spc->spc_ostatus = SPCSTATUS_WANTED; 157 pthread_cond_wait(&spc->spc_cv, &spc->spc_mtx); 158 } 159 spc->spc_ostatus = SPCSTATUS_BUSY; 160 pthread_mutex_unlock(&spc->spc_mtx); 161 } 162 163 static void 164 sendunlock(struct spclient *spc) 165 { 166 167 pthread_mutex_lock(&spc->spc_mtx); 168 if (spc->spc_ostatus == SPCSTATUS_WANTED) 169 pthread_cond_broadcast(&spc->spc_cv); 170 spc->spc_ostatus = SPCSTATUS_FREE; 171 pthread_mutex_unlock(&spc->spc_mtx); 172 } 173 174 static int 175 dosend(struct spclient *spc, const void *data, size_t dlen) 176 { 177 struct pollfd pfd; 178 const uint8_t *sdata = data; 179 ssize_t n; 180 size_t sent; 181 int fd = spc->spc_fd; 182 183 pfd.fd = fd; 184 pfd.events = POLLOUT; 185 186 for (sent = 0, n = 0; sent < dlen; ) { 187 if (n) { 188 if (poll(&pfd, 1, INFTIM) == -1) { 189 if (errno == EINTR) 190 continue; 191 return errno; 192 } 193 } 194 195 n = send(fd, sdata + sent, dlen - sent, MSG_NOSIGNAL); 196 if (n == 0) { 197 return EFAULT; 198 } 199 if (n == -1 && errno != EAGAIN) { 200 return EFAULT; 201 } 202 sent += n; 203 } 204 205 return 0; 206 } 207 208 static void 209 putwait(struct spclient *spc, struct respwait *rw, struct rsp_hdr *rhdr) 210 { 211 212 rw->rw_data = NULL; 213 rw->rw_dlen = 0; 214 pthread_cond_init(&rw->rw_cv, NULL); 215 216 pthread_mutex_lock(&spc->spc_mtx); 217 rw->rw_reqno = rhdr->rsp_reqno = spc->spc_nextreq++; 218 TAILQ_INSERT_TAIL(&spc->spc_respwait, rw, rw_entries); 219 } 220 221 static void 222 unputwait(struct spclient *spc, struct respwait *rw) 223 { 224 225 TAILQ_REMOVE(&spc->spc_respwait, rw, rw_entries); 226 pthread_mutex_unlock(&spc->spc_mtx); 227 pthread_cond_destroy(&rw->rw_cv); 228 } 229 230 static void 231 kickwaiter(struct spclient *spc) 232 { 233 struct respwait *rw; 234 235 pthread_mutex_lock(&spc->spc_mtx); 236 TAILQ_FOREACH(rw, &spc->spc_respwait, rw_entries) { 237 if (rw->rw_reqno == spc->spc_hdr.rsp_reqno) 238 break; 239 } 240 if (rw == NULL) { 241 printf("PANIC: no waiter\n"); 242 abort(); 243 return; 244 } 245 rw->rw_data = spc->spc_buf; 246 pthread_cond_signal(&rw->rw_cv); 247 pthread_mutex_unlock(&spc->spc_mtx); 248 249 spc->spc_buf = NULL; 250 spc->spc_off = 0; 251 } 252 253 static void 254 kickall(struct spclient *spc) 255 { 256 struct respwait *rw; 257 258 /* DIAGASSERT(mutex_owned(spc_lock)) */ 259 TAILQ_FOREACH(rw, &spc->spc_respwait, rw_entries) 260 pthread_cond_signal(&rw->rw_cv); 261 } 262 263 static int 264 waitresp(struct spclient *spc, struct respwait *rw) 265 { 266 struct pollfd pfd; 267 int rv = 0; 268 269 while (rw->rw_data == NULL && spc->spc_dying == 0) { 270 /* are we free to receive? */ 271 if (spc->spc_istatus == SPCSTATUS_FREE) { 272 int gotresp; 273 274 spc->spc_istatus = SPCSTATUS_BUSY; 275 pthread_mutex_unlock(&spc->spc_mtx); 276 277 pfd.fd = spc->spc_fd; 278 pfd.events = POLLIN; 279 280 for (gotresp = 0; !gotresp; ) { 281 rv = readframe(spc); 282 switch (rv) { 283 case 0: 284 poll(&pfd, 1, INFTIM); 285 continue; 286 case -1: 287 spc->spc_dying = 1; 288 break; 289 default: 290 break; 291 } 292 293 switch (spc->spc_hdr.rsp_class) { 294 case RUMPSP_RESP: 295 kickwaiter(spc); 296 gotresp = spc->spc_hdr.rsp_reqno == 297 rw->rw_reqno; 298 break; 299 case RUMPSP_REQ: 300 handlereq(spc); 301 break; 302 default: 303 /* panic */ 304 break; 305 } 306 } 307 pthread_mutex_lock(&spc->spc_mtx); 308 if (spc->spc_istatus == SPCSTATUS_WANTED) 309 kickall(spc); 310 spc->spc_istatus = SPCSTATUS_FREE; 311 } else { 312 spc->spc_istatus = SPCSTATUS_WANTED; 313 pthread_cond_wait(&rw->rw_cv, &spc->spc_mtx); 314 } 315 } 316 317 TAILQ_REMOVE(&spc->spc_respwait, rw, rw_entries); 318 pthread_mutex_unlock(&spc->spc_mtx); 319 320 pthread_cond_destroy(&rw->rw_cv); 321 return rv; 322 } 323 324 static int 325 readframe(struct spclient *spc) 326 { 327 int fd = spc->spc_fd; 328 size_t left; 329 size_t framelen; 330 ssize_t n; 331 332 /* still reading header? */ 333 if (spc->spc_off < HDRSZ) { 334 DPRINTF(("rump_sp: readframe getting header at offset %zu\n", 335 spc->spc_off)); 336 337 left = HDRSZ - spc->spc_off; 338 /*LINTED: cast ok */ 339 n = read(fd, (uint8_t *)&spc->spc_hdr + spc->spc_off, left); 340 if (n == 0) { 341 return -1; 342 } 343 if (n == -1) { 344 if (errno == EAGAIN) 345 return 0; 346 return -1; 347 } 348 349 spc->spc_off += n; 350 if (spc->spc_off < HDRSZ) 351 return -1; 352 353 /*LINTED*/ 354 framelen = spc->spc_hdr.rsp_len; 355 356 if (framelen < HDRSZ) { 357 return -1; 358 } else if (framelen == HDRSZ) { 359 return 1; 360 } 361 362 spc->spc_buf = malloc(framelen - HDRSZ); 363 if (spc->spc_buf == NULL) { 364 return -1; 365 } 366 memset(spc->spc_buf, 0, framelen - HDRSZ); 367 368 /* "fallthrough" */ 369 } else { 370 /*LINTED*/ 371 framelen = spc->spc_hdr.rsp_len; 372 } 373 374 left = framelen - spc->spc_off; 375 376 DPRINTF(("rump_sp: readframe getting body at offset %zu, left %zu\n", 377 spc->spc_off, left)); 378 379 if (left == 0) 380 return 1; 381 n = read(fd, spc->spc_buf + (spc->spc_off - HDRSZ), left); 382 if (n == 0) { 383 return -1; 384 } 385 if (n == -1) { 386 if (errno == EAGAIN) 387 return 0; 388 return -1; 389 } 390 spc->spc_off += n; 391 left -= n; 392 393 /* got everything? */ 394 if (left == 0) 395 return 1; 396 else 397 return 0; 398 } 399 400 static int 401 tcp_parse(const char *addr, struct sockaddr **sa, int allow_wildcard) 402 { 403 struct sockaddr_in sin; 404 char buf[64]; 405 const char *p; 406 size_t l; 407 int port; 408 409 memset(&sin, 0, sizeof(sin)); 410 sin.sin_len = sizeof(sin); 411 sin.sin_family = AF_INET; 412 413 p = strchr(addr, ':'); 414 if (!p) { 415 fprintf(stderr, "rump_sp_tcp: missing port specifier\n"); 416 return EINVAL; 417 } 418 419 l = p - addr; 420 if (l > sizeof(buf)-1) { 421 fprintf(stderr, "rump_sp_tcp: address too long\n"); 422 return EINVAL; 423 } 424 strncpy(buf, addr, l); 425 buf[l] = '\0'; 426 427 /* special INADDR_ANY treatment */ 428 if (strcmp(buf, "*") == 0 || strcmp(buf, "0") == 0) { 429 sin.sin_addr.s_addr = INADDR_ANY; 430 } else { 431 switch (inet_pton(AF_INET, buf, &sin.sin_addr)) { 432 case 1: 433 break; 434 case 0: 435 fprintf(stderr, "rump_sp_tcp: cannot parse %s\n", buf); 436 return EINVAL; 437 case -1: 438 fprintf(stderr, "rump_sp_tcp: inet_pton failed\n"); 439 return errno; 440 default: 441 assert(/*CONSTCOND*/0); 442 return EINVAL; 443 } 444 } 445 446 if (!allow_wildcard && sin.sin_addr.s_addr == INADDR_ANY) { 447 fprintf(stderr, "rump_sp_tcp: client needs !INADDR_ANY\n"); 448 return EINVAL; 449 } 450 451 /* advance to port number & parse */ 452 p++; 453 l = strspn(p, "0123456789"); 454 if (l == 0) { 455 fprintf(stderr, "rump_sp_tcp: port now found: %s\n", p); 456 return EINVAL; 457 } 458 strncpy(buf, p, l); 459 buf[l] = '\0'; 460 461 if (*(p+l) != '/' && *(p+l) != '\0') { 462 fprintf(stderr, "rump_sp_tcp: junk at end of port: %s\n", addr); 463 return EINVAL; 464 } 465 466 port = atoi(buf); 467 if (port < 0 || port >= (1<<(8*sizeof(in_port_t)))) { 468 fprintf(stderr, "rump_sp_tcp: port %d out of range\n", port); 469 return ERANGE; 470 } 471 sin.sin_port = htons(port); 472 473 *sa = malloc(sizeof(sin)); 474 if (*sa == NULL) 475 return errno; 476 memcpy(*sa, &sin, sizeof(sin)); 477 return 0; 478 } 479 480 static int 481 tcp_connecthook(int s) 482 { 483 int x; 484 485 x = 1; 486 setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &x, sizeof(x)); 487 488 return 0; 489 } 490 491 /*ARGSUSED*/ 492 static int 493 unix_parse(const char *addr, struct sockaddr **sa, int allow_wildcard) 494 { 495 struct sockaddr_un sun; 496 size_t slen; 497 498 if (strlen(addr) > sizeof(sun.sun_path)) 499 return ENAMETOOLONG; 500 501 /* 502 * The pathname can be all kinds of spaghetti elementals, 503 * so meek and obidient we accept everything. 504 */ 505 memset(&sun, 0, sizeof(sun)); 506 sun.sun_family = AF_LOCAL; 507 strlcpy(sun.sun_path, addr, sizeof(sun.sun_path)); 508 sun.sun_len = slen = SUN_LEN(&sun); 509 510 *sa = malloc(slen); 511 if (*sa == NULL) 512 return errno; 513 memcpy(*sa, &sun, slen); 514 515 return 0; 516 } 517 518 /*ARGSUSED*/ 519 static int 520 notsupp(void) 521 { 522 523 fprintf(stderr, "rump_sp: support not yet implemented\n"); 524 return EOPNOTSUPP; 525 } 526 527 static int 528 success(void) 529 { 530 531 return 0; 532 } 533 534 struct { 535 const char *id; 536 int domain; 537 addrparse_fn ap; 538 connecthook_fn connhook; 539 } parsetab[] = { 540 { "tcp", PF_INET, tcp_parse, tcp_connecthook }, 541 { "unix", PF_LOCAL, unix_parse, (connecthook_fn)success }, 542 { "tcp6", PF_INET6, (addrparse_fn)notsupp, (connecthook_fn)success }, 543 }; 544 #define NPARSE (sizeof(parsetab)/sizeof(parsetab[0])) 545 546 static int 547 parseurl(const char *url, struct sockaddr **sap, unsigned *idxp, 548 int allow_wildcard) 549 { 550 char id[16]; 551 const char *p, *p2; 552 size_t l; 553 unsigned i; 554 int error; 555 556 /* 557 * Parse the url 558 */ 559 560 p = url; 561 p2 = strstr(p, "://"); 562 if (!p2) { 563 fprintf(stderr, "rump_sp: invalid locator ``%s''\n", p); 564 return EINVAL; 565 } 566 l = p2-p; 567 if (l > sizeof(id)-1) { 568 fprintf(stderr, "rump_sp: identifier too long in ``%s''\n", p); 569 return EINVAL; 570 } 571 572 strncpy(id, p, l); 573 id[l] = '\0'; 574 p2 += 3; /* beginning of address */ 575 576 for (i = 0; i < NPARSE; i++) { 577 if (strcmp(id, parsetab[i].id) == 0) { 578 error = parsetab[i].ap(p2, sap, allow_wildcard); 579 if (error) 580 return error; 581 break; 582 } 583 } 584 if (i == NPARSE) { 585 fprintf(stderr, "rump_sp: invalid identifier ``%s''\n", p); 586 return EINVAL; 587 } 588 589 *idxp = i; 590 return 0; 591 } 592
Indexes created Thu Sep 25 16:09:42 GMT 2025