1 /*- 2 * Copyright (c) 1998-2004 Dag-Erling Co�dan Sm�rgrav 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 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 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/socket.h> 34 #include <sys/time.h> 35 #include <sys/uio.h> 36 37 #include <netinet/in.h> 38 39 #include <ctype.h> 40 #include <errno.h> 41 #include <netdb.h> 42 #include <pwd.h> 43 #include <stdarg.h> 44 #include <stdlib.h> 45 #include <stdio.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 #include "fetch.h" 50 #include "common.h" 51 52 53 /*** Local data **************************************************************/ 54 55 /* 56 * Error messages for resolver errors 57 */ 58 static struct fetcherr netdb_errlist[] = { 59 #ifdef EAI_NODATA 60 { EAI_NODATA, FETCH_RESOLV, "Host not found" }, 61 #endif 62 { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, 63 { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, 64 { EAI_NONAME, FETCH_RESOLV, "No address record" }, 65 { -1, FETCH_UNKNOWN, "Unknown resolver error" } 66 }; 67 68 /* End-of-Line */ 69 static const char ENDL[2] = "\r\n"; 70 71 72 /*** Error-reporting functions ***********************************************/ 73 74 /* 75 * Map error code to string 76 */ 77 static struct fetcherr * 78 fetch_finderr(struct fetcherr *p, int e) 79 { 80 while (p->num != -1 && p->num != e) 81 p++; 82 return (p); 83 } 84 85 /* 86 * Set error code 87 */ 88 void 89 fetch_seterr(struct fetcherr *p, int e) 90 { 91 p = fetch_finderr(p, e); 92 fetchLastErrCode = p->cat; 93 snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string); 94 } 95 96 /* 97 * Set error code according to errno 98 */ 99 void 100 fetch_syserr(void) 101 { 102 switch (errno) { 103 case 0: 104 fetchLastErrCode = FETCH_OK; 105 break; 106 case EPERM: 107 case EACCES: 108 case EROFS: 109 case EAUTH: 110 case ENEEDAUTH: 111 fetchLastErrCode = FETCH_AUTH; 112 break; 113 case ENOENT: 114 case EISDIR: /* XXX */ 115 fetchLastErrCode = FETCH_UNAVAIL; 116 break; 117 case ENOMEM: 118 fetchLastErrCode = FETCH_MEMORY; 119 break; 120 case EBUSY: 121 case EAGAIN: 122 fetchLastErrCode = FETCH_TEMP; 123 break; 124 case EEXIST: 125 fetchLastErrCode = FETCH_EXISTS; 126 break; 127 case ENOSPC: 128 fetchLastErrCode = FETCH_FULL; 129 break; 130 case EADDRINUSE: 131 case EADDRNOTAVAIL: 132 case ENETDOWN: 133 case ENETUNREACH: 134 case ENETRESET: 135 case EHOSTUNREACH: 136 fetchLastErrCode = FETCH_NETWORK; 137 break; 138 case ECONNABORTED: 139 case ECONNRESET: 140 fetchLastErrCode = FETCH_ABORT; 141 break; 142 case ETIMEDOUT: 143 fetchLastErrCode = FETCH_TIMEOUT; 144 break; 145 case ECONNREFUSED: 146 case EHOSTDOWN: 147 fetchLastErrCode = FETCH_DOWN; 148 break; 149 default: 150 fetchLastErrCode = FETCH_UNKNOWN; 151 } 152 snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno)); 153 } 154 155 156 /* 157 * Emit status message 158 */ 159 void 160 fetch_info(const char *fmt, ...) 161 { 162 va_list ap; 163 164 va_start(ap, fmt); 165 vfprintf(stderr, fmt, ap); 166 va_end(ap); 167 fputc('\n', stderr); 168 } 169 170 171 /*** Network-related utility functions ***************************************/ 172 173 /* 174 * Return the default port for a scheme 175 */ 176 int 177 fetch_default_port(const char *scheme) 178 { 179 struct servent *se; 180 181 if ((se = getservbyname(scheme, "tcp")) != NULL) 182 return (ntohs(se->s_port)); 183 if (strcasecmp(scheme, SCHEME_FTP) == 0) 184 return (FTP_DEFAULT_PORT); 185 if (strcasecmp(scheme, SCHEME_HTTP) == 0) 186 return (HTTP_DEFAULT_PORT); 187 return (0); 188 } 189 190 /* 191 * Return the default proxy port for a scheme 192 */ 193 int 194 fetch_default_proxy_port(const char *scheme) 195 { 196 if (strcasecmp(scheme, SCHEME_FTP) == 0) 197 return (FTP_DEFAULT_PROXY_PORT); 198 if (strcasecmp(scheme, SCHEME_HTTP) == 0) 199 return (HTTP_DEFAULT_PROXY_PORT); 200 return (0); 201 } 202 203 204 /* 205 * Create a connection for an existing descriptor. 206 */ 207 conn_t * 208 fetch_reopen(int sd) 209 { 210 conn_t *conn; 211 212 /* allocate and fill connection structure */ 213 if ((conn = calloc(1, sizeof(*conn))) == NULL) 214 return (NULL); 215 conn->sd = sd; 216 ++conn->ref; 217 return (conn); 218 } 219 220 221 /* 222 * Bump a connection's reference count. 223 */ 224 conn_t * 225 fetch_ref(conn_t *conn) 226 { 227 228 ++conn->ref; 229 return (conn); 230 } 231 232 233 /* 234 * Bind a socket to a specific local address 235 */ 236 int 237 fetch_bind(int sd, int af, const char *addr) 238 { 239 struct addrinfo hints, *res, *res0; 240 int err; 241 242 memset(&hints, 0, sizeof(hints)); 243 hints.ai_family = af; 244 hints.ai_socktype = SOCK_STREAM; 245 hints.ai_protocol = 0; 246 if ((err = getaddrinfo(addr, NULL, &hints, &res0)) != 0) 247 return (-1); 248 for (res = res0; res; res = res->ai_next) 249 if (bind(sd, res->ai_addr, res->ai_addrlen) == 0) 250 return (0); 251 return (-1); 252 } 253 254 255 /* 256 * Establish a TCP connection to the specified port on the specified host. 257 */ 258 conn_t * 259 fetch_connect(const char *host, int port, int af, int verbose) 260 { 261 conn_t *conn; 262 char pbuf[10]; 263 const char *bindaddr; 264 struct addrinfo hints, *res, *res0; 265 int sd, err; 266 267 DEBUG(fprintf(stderr, "---> %s:%d\n", host, port)); 268 269 if (verbose) 270 fetch_info("looking up %s", host); 271 272 /* look up host name and set up socket address structure */ 273 snprintf(pbuf, sizeof(pbuf), "%d", port); 274 memset(&hints, 0, sizeof(hints)); 275 hints.ai_family = af; 276 hints.ai_socktype = SOCK_STREAM; 277 hints.ai_protocol = 0; 278 if ((err = getaddrinfo(host, pbuf, &hints, &res0)) != 0) { 279 netdb_seterr(err); 280 return (NULL); 281 } 282 bindaddr = getenv("FETCH_BIND_ADDRESS"); 283 284 if (verbose) 285 fetch_info("connecting to %s:%d", host, port); 286 287 /* try to connect */ 288 for (sd = -1, res = res0; res; sd = -1, res = res->ai_next) { 289 if ((sd = socket(res->ai_family, res->ai_socktype, 290 res->ai_protocol)) == -1) 291 continue; 292 if (bindaddr != NULL && *bindaddr != '\0' && 293 fetch_bind(sd, res->ai_family, bindaddr) != 0) { 294 fetch_info("failed to bind to '%s'", bindaddr); 295 close(sd); 296 continue; 297 } 298 if (connect(sd, res->ai_addr, res->ai_addrlen) == 0) 299 break; 300 close(sd); 301 } 302 freeaddrinfo(res0); 303 if (sd == -1) { 304 fetch_syserr(); 305 return (NULL); 306 } 307 308 if ((conn = fetch_reopen(sd)) == NULL) { 309 fetch_syserr(); 310 close(sd); 311 } 312 return (conn); 313 } 314 315 316 /* 317 * Enable SSL on a connection. 318 */ 319 int 320 fetch_ssl(conn_t *conn, int verbose) 321 { 322 323 #ifdef WITH_SSL 324 /* Init the SSL library and context */ 325 if (!SSL_library_init()){ 326 fprintf(stderr, "SSL library init failed\n"); 327 return (-1); 328 } 329 330 SSL_load_error_strings(); 331 332 conn->ssl_meth = SSLv23_client_method(); 333 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); 334 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 335 336 conn->ssl = SSL_new(conn->ssl_ctx); 337 if (conn->ssl == NULL){ 338 fprintf(stderr, "SSL context creation failed\n"); 339 return (-1); 340 } 341 SSL_set_fd(conn->ssl, conn->sd); 342 if (SSL_connect(conn->ssl) == -1){ 343 ERR_print_errors_fp(stderr); 344 return (-1); 345 } 346 347 if (verbose) { 348 X509_NAME *name; 349 char *str; 350 351 fprintf(stderr, "SSL connection established using %s\n", 352 SSL_get_cipher(conn->ssl)); 353 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 354 name = X509_get_subject_name(conn->ssl_cert); 355 str = X509_NAME_oneline(name, 0, 0); 356 printf("Certificate subject: %s\n", str); 357 free(str); 358 name = X509_get_issuer_name(conn->ssl_cert); 359 str = X509_NAME_oneline(name, 0, 0); 360 printf("Certificate issuer: %s\n", str); 361 free(str); 362 } 363 364 return (0); 365 #else 366 (void)conn; 367 (void)verbose; 368 fprintf(stderr, "SSL support disabled\n"); 369 return (-1); 370 #endif 371 } 372 373 374 /* 375 * Read a character from a connection w/ timeout 376 */ 377 ssize_t 378 fetch_read(conn_t *conn, char *buf, size_t len) 379 { 380 struct timeval now, timeout, delta; 381 fd_set readfds; 382 ssize_t rlen, total; 383 int r; 384 385 if (fetchTimeout) { 386 FD_ZERO(&readfds); 387 gettimeofday(&timeout, NULL); 388 timeout.tv_sec += fetchTimeout; 389 } 390 391 total = 0; 392 while (len > 0) { 393 while (fetchTimeout && !FD_ISSET(conn->sd, &readfds)) { 394 FD_SET(conn->sd, &readfds); 395 gettimeofday(&now, NULL); 396 delta.tv_sec = timeout.tv_sec - now.tv_sec; 397 delta.tv_usec = timeout.tv_usec - now.tv_usec; 398 if (delta.tv_usec < 0) { 399 delta.tv_usec += 1000000; 400 delta.tv_sec--; 401 } 402 if (delta.tv_sec < 0) { 403 errno = ETIMEDOUT; 404 fetch_syserr(); 405 return (-1); 406 } 407 errno = 0; 408 r = select(conn->sd + 1, &readfds, NULL, NULL, &delta); 409 if (r == -1) { 410 if (errno == EINTR && fetchRestartCalls) 411 continue; 412 fetch_syserr(); 413 return (-1); 414 } 415 } 416 #ifdef WITH_SSL 417 if (conn->ssl != NULL) 418 rlen = SSL_read(conn->ssl, buf, len); 419 else 420 #endif 421 rlen = read(conn->sd, buf, len); 422 if (rlen == 0) 423 break; 424 if (rlen < 0) { 425 if (errno == EINTR && fetchRestartCalls) 426 continue; 427 return (-1); 428 } 429 len -= rlen; 430 buf += rlen; 431 total += rlen; 432 } 433 return (total); 434 } 435 436 437 /* 438 * Read a line of text from a connection w/ timeout 439 */ 440 #define MIN_BUF_SIZE 1024 441 442 int 443 fetch_getln(conn_t *conn) 444 { 445 char *tmp; 446 size_t tmpsize; 447 ssize_t len; 448 char c; 449 450 if (conn->buf == NULL) { 451 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 452 errno = ENOMEM; 453 return (-1); 454 } 455 conn->bufsize = MIN_BUF_SIZE; 456 } 457 458 conn->buf[0] = '\0'; 459 conn->buflen = 0; 460 461 do { 462 len = fetch_read(conn, &c, 1); 463 if (len == -1) 464 return (-1); 465 if (len == 0) 466 break; 467 conn->buf[conn->buflen++] = c; 468 if (conn->buflen == conn->bufsize) { 469 tmp = conn->buf; 470 tmpsize = conn->bufsize * 2 + 1; 471 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 472 errno = ENOMEM; 473 return (-1); 474 } 475 conn->buf = tmp; 476 conn->bufsize = tmpsize; 477 } 478 } while (c != '\n'); 479 480 conn->buf[conn->buflen] = '\0'; 481 DEBUG(fprintf(stderr, "<<< %s", conn->buf)); 482 return (0); 483 } 484 485 486 /* 487 * Write to a connection w/ timeout 488 */ 489 ssize_t 490 fetch_write(conn_t *conn, const char *buf, size_t len) 491 { 492 struct iovec iov; 493 494 iov.iov_base = __DECONST(char *, buf); 495 iov.iov_len = len; 496 return fetch_writev(conn, &iov, 1); 497 } 498 499 /* 500 * Write a vector to a connection w/ timeout 501 * Note: can modify the iovec. 502 */ 503 ssize_t 504 fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 505 { 506 struct timeval now, timeout, delta; 507 fd_set writefds; 508 ssize_t wlen, total; 509 int r; 510 511 if (fetchTimeout) { 512 FD_ZERO(&writefds); 513 gettimeofday(&timeout, NULL); 514 timeout.tv_sec += fetchTimeout; 515 } 516 517 total = 0; 518 while (iovcnt > 0) { 519 while (fetchTimeout && !FD_ISSET(conn->sd, &writefds)) { 520 FD_SET(conn->sd, &writefds); 521 gettimeofday(&now, NULL); 522 delta.tv_sec = timeout.tv_sec - now.tv_sec; 523 delta.tv_usec = timeout.tv_usec - now.tv_usec; 524 if (delta.tv_usec < 0) { 525 delta.tv_usec += 1000000; 526 delta.tv_sec--; 527 } 528 if (delta.tv_sec < 0) { 529 errno = ETIMEDOUT; 530 fetch_syserr(); 531 return (-1); 532 } 533 errno = 0; 534 r = select(conn->sd + 1, NULL, &writefds, NULL, &delta); 535 if (r == -1) { 536 if (errno == EINTR && fetchRestartCalls) 537 continue; 538 return (-1); 539 } 540 } 541 errno = 0; 542 #ifdef WITH_SSL 543 if (conn->ssl != NULL) 544 wlen = SSL_write(conn->ssl, 545 iov->iov_base, iov->iov_len); 546 else 547 #endif 548 wlen = writev(conn->sd, iov, iovcnt); 549 if (wlen == 0) { 550 /* we consider a short write a failure */ 551 errno = EPIPE; 552 fetch_syserr(); 553 return (-1); 554 } 555 if (wlen < 0) { 556 if (errno == EINTR && fetchRestartCalls) 557 continue; 558 return (-1); 559 } 560 total += wlen; 561 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 562 wlen -= iov->iov_len; 563 iov++; 564 iovcnt--; 565 } 566 if (iovcnt > 0) { 567 iov->iov_len -= wlen; 568 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 569 } 570 } 571 return (total); 572 } 573 574 575 /* 576 * Write a line of text to a connection w/ timeout 577 */ 578 int 579 fetch_putln(conn_t *conn, const char *str, size_t len) 580 { 581 struct iovec iov[2]; 582 int ret; 583 584 DEBUG(fprintf(stderr, ">>> %s\n", str)); 585 iov[0].iov_base = __DECONST(char *, str); 586 iov[0].iov_len = len; 587 iov[1].iov_base = __DECONST(char *, ENDL); 588 iov[1].iov_len = sizeof(ENDL); 589 if (len == 0) 590 ret = fetch_writev(conn, &iov[1], 1); 591 else 592 ret = fetch_writev(conn, iov, 2); 593 if (ret == -1) 594 return (-1); 595 return (0); 596 } 597 598 599 /* 600 * Close connection 601 */ 602 int 603 fetch_close(conn_t *conn) 604 { 605 int ret; 606 607 if (--conn->ref > 0) 608 return (0); 609 ret = close(conn->sd); 610 free(conn->buf); 611 free(conn); 612 return (ret); 613 } 614 615 616 /*** Directory-related utility functions *************************************/ 617 618 int 619 fetch_add_entry(struct url_ent **p, int *size, int *len, 620 const char *name, struct url_stat *us) 621 { 622 struct url_ent *tmp; 623 624 if (*p == NULL) { 625 *size = 0; 626 *len = 0; 627 } 628 629 if (*len >= *size - 1) { 630 tmp = realloc(*p, (*size * 2 + 1) * sizeof(**p)); 631 if (tmp == NULL) { 632 errno = ENOMEM; 633 fetch_syserr(); 634 return (-1); 635 } 636 *size = (*size * 2 + 1); 637 *p = tmp; 638 } 639 640 tmp = *p + *len; 641 snprintf(tmp->name, PATH_MAX, "%s", name); 642 memcpy(&tmp->stat, us, sizeof(*us)); 643 644 (*len)++; 645 (++tmp)->name[0] = 0; 646 647 return (0); 648 } 649 650 651 /*** Authentication-related utility functions ********************************/ 652 653 static const char * 654 fetch_read_word(FILE *f) 655 { 656 static char word[1024]; 657 658 if (fscanf(f, " %1023s ", word) != 1) 659 return (NULL); 660 return (word); 661 } 662 663 /* 664 * Get authentication data for a URL from .netrc 665 */ 666 int 667 fetch_netrc_auth(struct url *url) 668 { 669 char fn[PATH_MAX]; 670 const char *word; 671 char *p; 672 FILE *f; 673 674 if ((p = getenv("NETRC")) != NULL) { 675 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 676 fetch_info("$NETRC specifies a file name " 677 "longer than PATH_MAX"); 678 return (-1); 679 } 680 } else { 681 if ((p = getenv("HOME")) != NULL) { 682 struct passwd *pwd; 683 684 if ((pwd = getpwuid(getuid())) == NULL || 685 (p = pwd->pw_dir) == NULL) 686 return (-1); 687 } 688 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 689 return (-1); 690 } 691 692 if ((f = fopen(fn, "r")) == NULL) 693 return (-1); 694 while ((word = fetch_read_word(f)) != NULL) { 695 if (strcmp(word, "default") == 0) { 696 DEBUG(fetch_info("Using default .netrc settings")); 697 break; 698 } 699 if (strcmp(word, "machine") == 0 && 700 (word = fetch_read_word(f)) != NULL && 701 strcasecmp(word, url->host) == 0) { 702 DEBUG(fetch_info("Using .netrc settings for %s", word)); 703 break; 704 } 705 } 706 if (word == NULL) 707 goto ferr; 708 while ((word = fetch_read_word(f)) != NULL) { 709 if (strcmp(word, "login") == 0) { 710 if ((word = fetch_read_word(f)) == NULL) 711 goto ferr; 712 if (snprintf(url->user, sizeof(url->user), 713 "%s", word) > (int)sizeof(url->user)) { 714 fetch_info("login name in .netrc is too long"); 715 url->user[0] = '\0'; 716 } 717 } else if (strcmp(word, "password") == 0) { 718 if ((word = fetch_read_word(f)) == NULL) 719 goto ferr; 720 if (snprintf(url->pwd, sizeof(url->pwd), 721 "%s", word) > (int)sizeof(url->pwd)) { 722 fetch_info("password in .netrc is too long"); 723 url->pwd[0] = '\0'; 724 } 725 } else if (strcmp(word, "account") == 0) { 726 if ((word = fetch_read_word(f)) == NULL) 727 goto ferr; 728 /* XXX not supported! */ 729 } else { 730 break; 731 } 732 } 733 fclose(f); 734 return (0); 735 ferr: 736 fclose(f); 737 return (-1); 738 } 739 740 /* 741 * The no_proxy environment variable specifies a set of domains for 742 * which the proxy should not be consulted; the contents is a comma-, 743 * or space-separated list of domain names. A single asterisk will 744 * override all proxy variables and no transactions will be proxied 745 * (for compatability with lynx and curl, see the discussion at 746 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 747 */ 748 int 749 fetch_no_proxy_match(const char *host) 750 { 751 const char *no_proxy, *p, *q; 752 size_t h_len, d_len; 753 754 if ((no_proxy = getenv("NO_PROXY")) == NULL && 755 (no_proxy = getenv("no_proxy")) == NULL) 756 return (0); 757 758 /* asterisk matches any hostname */ 759 if (strcmp(no_proxy, "*") == 0) 760 return (1); 761 762 h_len = strlen(host); 763 p = no_proxy; 764 do { 765 /* position p at the beginning of a domain suffix */ 766 while (*p == ',' || isspace((unsigned char)*p)) 767 p++; 768 769 /* position q at the first separator character */ 770 for (q = p; *q; ++q) 771 if (*q == ',' || isspace((unsigned char)*q)) 772 break; 773 774 d_len = q - p; 775 if (d_len > 0 && h_len >= d_len && 776 strncasecmp(host + h_len - d_len, 777 p, d_len) == 0) { 778 /* domain name matches */ 779 return (1); 780 } 781 782 p = q + 1; 783 } while (*q); 784 785 return (0); 786 } 787