common.c revision 234837
1/*- 2 * Copyright (c) 1998-2011 Dag-Erling 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: head/lib/libfetch/common.c 234837 2012-04-30 12:11:45Z des $"); 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 <fcntl.h> 42#include <netdb.h> 43#include <pwd.h> 44#include <stdarg.h> 45#include <stdlib.h> 46#include <stdio.h> 47#include <string.h> 48#include <unistd.h> 49 50#include "fetch.h" 51#include "common.h" 52 53 54/*** Local data **************************************************************/ 55 56/* 57 * Error messages for resolver errors 58 */ 59static struct fetcherr netdb_errlist[] = { 60#ifdef EAI_NODATA 61 { EAI_NODATA, FETCH_RESOLV, "Host not found" }, 62#endif 63 { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, 64 { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, 65 { EAI_NONAME, FETCH_RESOLV, "No address record" }, 66 { -1, FETCH_UNKNOWN, "Unknown resolver error" } 67}; 68 69/* End-of-Line */ 70static const char ENDL[2] = "\r\n"; 71 72 73/*** Error-reporting functions ***********************************************/ 74 75/* 76 * Map error code to string 77 */ 78static struct fetcherr * 79fetch_finderr(struct fetcherr *p, int e) 80{ 81 while (p->num != -1 && p->num != e) 82 p++; 83 return (p); 84} 85 86/* 87 * Set error code 88 */ 89void 90fetch_seterr(struct fetcherr *p, int e) 91{ 92 p = fetch_finderr(p, e); 93 fetchLastErrCode = p->cat; 94 snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string); 95} 96 97/* 98 * Set error code according to errno 99 */ 100void 101fetch_syserr(void) 102{ 103 switch (errno) { 104 case 0: 105 fetchLastErrCode = FETCH_OK; 106 break; 107 case EPERM: 108 case EACCES: 109 case EROFS: 110 case EAUTH: 111 case ENEEDAUTH: 112 fetchLastErrCode = FETCH_AUTH; 113 break; 114 case ENOENT: 115 case EISDIR: /* XXX */ 116 fetchLastErrCode = FETCH_UNAVAIL; 117 break; 118 case ENOMEM: 119 fetchLastErrCode = FETCH_MEMORY; 120 break; 121 case EBUSY: 122 case EAGAIN: 123 fetchLastErrCode = FETCH_TEMP; 124 break; 125 case EEXIST: 126 fetchLastErrCode = FETCH_EXISTS; 127 break; 128 case ENOSPC: 129 fetchLastErrCode = FETCH_FULL; 130 break; 131 case EADDRINUSE: 132 case EADDRNOTAVAIL: 133 case ENETDOWN: 134 case ENETUNREACH: 135 case ENETRESET: 136 case EHOSTUNREACH: 137 fetchLastErrCode = FETCH_NETWORK; 138 break; 139 case ECONNABORTED: 140 case ECONNRESET: 141 fetchLastErrCode = FETCH_ABORT; 142 break; 143 case ETIMEDOUT: 144 fetchLastErrCode = FETCH_TIMEOUT; 145 break; 146 case ECONNREFUSED: 147 case EHOSTDOWN: 148 fetchLastErrCode = FETCH_DOWN; 149 break; 150default: 151 fetchLastErrCode = FETCH_UNKNOWN; 152 } 153 snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno)); 154} 155 156 157/* 158 * Emit status message 159 */ 160void 161fetch_info(const char *fmt, ...) 162{ 163 va_list ap; 164 165 va_start(ap, fmt); 166 vfprintf(stderr, fmt, ap); 167 va_end(ap); 168 fputc('\n', stderr); 169} 170 171 172/*** Network-related utility functions ***************************************/ 173 174/* 175 * Return the default port for a scheme 176 */ 177int 178fetch_default_port(const char *scheme) 179{ 180 struct servent *se; 181 182 if ((se = getservbyname(scheme, "tcp")) != NULL) 183 return (ntohs(se->s_port)); 184 if (strcasecmp(scheme, SCHEME_FTP) == 0) 185 return (FTP_DEFAULT_PORT); 186 if (strcasecmp(scheme, SCHEME_HTTP) == 0) 187 return (HTTP_DEFAULT_PORT); 188 return (0); 189} 190 191/* 192 * Return the default proxy port for a scheme 193 */ 194int 195fetch_default_proxy_port(const char *scheme) 196{ 197 if (strcasecmp(scheme, SCHEME_FTP) == 0) 198 return (FTP_DEFAULT_PROXY_PORT); 199 if (strcasecmp(scheme, SCHEME_HTTP) == 0) 200 return (HTTP_DEFAULT_PROXY_PORT); 201 return (0); 202} 203 204 205/* 206 * Create a connection for an existing descriptor. 207 */ 208conn_t * 209fetch_reopen(int sd) 210{ 211 conn_t *conn; 212 213 /* allocate and fill connection structure */ 214 if ((conn = calloc(1, sizeof(*conn))) == NULL) 215 return (NULL); 216 fcntl(sd, F_SETFD, FD_CLOEXEC); 217 conn->sd = sd; 218 ++conn->ref; 219 return (conn); 220} 221 222 223/* 224 * Bump a connection's reference count. 225 */ 226conn_t * 227fetch_ref(conn_t *conn) 228{ 229 230 ++conn->ref; 231 return (conn); 232} 233 234 235/* 236 * Bind a socket to a specific local address 237 */ 238int 239fetch_bind(int sd, int af, const char *addr) 240{ 241 struct addrinfo hints, *res, *res0; 242 int err; 243 244 memset(&hints, 0, sizeof(hints)); 245 hints.ai_family = af; 246 hints.ai_socktype = SOCK_STREAM; 247 hints.ai_protocol = 0; 248 if ((err = getaddrinfo(addr, NULL, &hints, &res0)) != 0) 249 return (-1); 250 for (res = res0; res; res = res->ai_next) 251 if (bind(sd, res->ai_addr, res->ai_addrlen) == 0) 252 return (0); 253 return (-1); 254} 255 256 257/* 258 * Establish a TCP connection to the specified port on the specified host. 259 */ 260conn_t * 261fetch_connect(const char *host, int port, int af, int verbose) 262{ 263 conn_t *conn; 264 char pbuf[10]; 265 const char *bindaddr; 266 struct addrinfo hints, *res, *res0; 267 int sd, err; 268 269 DEBUG(fprintf(stderr, "---> %s:%d\n", host, port)); 270 271 if (verbose) 272 fetch_info("looking up %s", host); 273 274 /* look up host name and set up socket address structure */ 275 snprintf(pbuf, sizeof(pbuf), "%d", port); 276 memset(&hints, 0, sizeof(hints)); 277 hints.ai_family = af; 278 hints.ai_socktype = SOCK_STREAM; 279 hints.ai_protocol = 0; 280 if ((err = getaddrinfo(host, pbuf, &hints, &res0)) != 0) { 281 netdb_seterr(err); 282 return (NULL); 283 } 284 bindaddr = getenv("FETCH_BIND_ADDRESS"); 285 286 if (verbose) 287 fetch_info("connecting to %s:%d", host, port); 288 289 /* try to connect */ 290 for (sd = -1, res = res0; res; sd = -1, res = res->ai_next) { 291 if ((sd = socket(res->ai_family, res->ai_socktype, 292 res->ai_protocol)) == -1) 293 continue; 294 if (bindaddr != NULL && *bindaddr != '\0' && 295 fetch_bind(sd, res->ai_family, bindaddr) != 0) { 296 fetch_info("failed to bind to '%s'", bindaddr); 297 close(sd); 298 continue; 299 } 300 if (connect(sd, res->ai_addr, res->ai_addrlen) == 0 && 301 fcntl(sd, F_SETFL, O_NONBLOCK) == 0) 302 break; 303 close(sd); 304 } 305 freeaddrinfo(res0); 306 if (sd == -1) { 307 fetch_syserr(); 308 return (NULL); 309 } 310 311 if ((conn = fetch_reopen(sd)) == NULL) { 312 fetch_syserr(); 313 close(sd); 314 } 315 return (conn); 316} 317 318 319/* 320 * Enable SSL on a connection. 321 */ 322int 323fetch_ssl(conn_t *conn, int verbose) 324{ 325#ifdef WITH_SSL 326 int ret, ssl_err; 327 328 /* Init the SSL library and context */ 329 if (!SSL_library_init()){ 330 fprintf(stderr, "SSL library init failed\n"); 331 return (-1); 332 } 333 334 SSL_load_error_strings(); 335 336 conn->ssl_meth = SSLv23_client_method(); 337 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); 338 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 339 340 conn->ssl = SSL_new(conn->ssl_ctx); 341 if (conn->ssl == NULL){ 342 fprintf(stderr, "SSL context creation failed\n"); 343 return (-1); 344 } 345 SSL_set_fd(conn->ssl, conn->sd); 346 while ((ret = SSL_connect(conn->ssl)) == -1) { 347 ssl_err = SSL_get_error(conn->ssl, ret); 348 if (ssl_err != SSL_ERROR_WANT_READ && 349 ssl_err != SSL_ERROR_WANT_WRITE) { 350 ERR_print_errors_fp(stderr); 351 return (-1); 352 } 353 } 354 355 if (verbose) { 356 X509_NAME *name; 357 char *str; 358 359 fprintf(stderr, "SSL connection established using %s\n", 360 SSL_get_cipher(conn->ssl)); 361 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 362 name = X509_get_subject_name(conn->ssl_cert); 363 str = X509_NAME_oneline(name, 0, 0); 364 printf("Certificate subject: %s\n", str); 365 free(str); 366 name = X509_get_issuer_name(conn->ssl_cert); 367 str = X509_NAME_oneline(name, 0, 0); 368 printf("Certificate issuer: %s\n", str); 369 free(str); 370 } 371 372 return (0); 373#else 374 (void)conn; 375 (void)verbose; 376 fprintf(stderr, "SSL support disabled\n"); 377 return (-1); 378#endif 379} 380 381#define FETCH_READ_WAIT -2 382#define FETCH_READ_ERROR -1 383#define FETCH_READ_DONE 0 384 385#ifdef WITH_SSL 386static ssize_t 387fetch_ssl_read(SSL *ssl, char *buf, size_t len) 388{ 389 ssize_t rlen; 390 int ssl_err; 391 392 rlen = SSL_read(ssl, buf, len); 393 if (rlen < 0) { 394 ssl_err = SSL_get_error(ssl, rlen); 395 if (ssl_err == SSL_ERROR_WANT_READ || 396 ssl_err == SSL_ERROR_WANT_WRITE) { 397 return (FETCH_READ_WAIT); 398 } else { 399 ERR_print_errors_fp(stderr); 400 return (FETCH_READ_ERROR); 401 } 402 } 403 return (rlen); 404} 405#endif 406 407/* 408 * Cache some data that was read from a socket but cannot be immediately 409 * returned because of an interrupted system call. 410 */ 411static int 412fetch_cache_data(conn_t *conn, char *src, size_t nbytes) 413{ 414 char *tmp; 415 416 if (conn->cache.size < nbytes) { 417 tmp = realloc(conn->cache.buf, nbytes); 418 if (tmp == NULL) { 419 fetch_syserr(); 420 return (-1); 421 } 422 conn->cache.buf = tmp; 423 conn->cache.size = nbytes; 424 } 425 426 memcpy(conn->cache.buf, src, nbytes); 427 conn->cache.len = nbytes; 428 conn->cache.pos = 0; 429 430 return (0); 431} 432 433 434static ssize_t 435fetch_socket_read(int sd, char *buf, size_t len) 436{ 437 ssize_t rlen; 438 439 rlen = read(sd, buf, len); 440 if (rlen < 0) { 441 if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls)) 442 return (FETCH_READ_WAIT); 443 else 444 return (FETCH_READ_ERROR); 445 } 446 return (rlen); 447} 448 449/* 450 * Read a character from a connection w/ timeout 451 */ 452ssize_t 453fetch_read(conn_t *conn, char *buf, size_t len) 454{ 455 struct timeval now, timeout, delta; 456 fd_set readfds; 457 ssize_t rlen, total; 458 char *start; 459 460 if (fetchTimeout > 0) { 461 gettimeofday(&timeout, NULL); 462 timeout.tv_sec += fetchTimeout; 463 } 464 465 total = 0; 466 start = buf; 467 468 if (conn->cache.len > 0) { 469 /* 470 * The last invocation of fetch_read was interrupted by a 471 * signal after some data had been read from the socket. Copy 472 * the cached data into the supplied buffer before trying to 473 * read from the socket again. 474 */ 475 total = (conn->cache.len < len) ? conn->cache.len : len; 476 memcpy(buf, conn->cache.buf, total); 477 478 conn->cache.len -= total; 479 conn->cache.pos += total; 480 len -= total; 481 buf += total; 482 } 483 484 while (len > 0) { 485 /* 486 * The socket is non-blocking. Instead of the canonical 487 * select() -> read(), we do the following: 488 * 489 * 1) call read() or SSL_read(). 490 * 2) if an error occurred, return -1. 491 * 3) if we received data but we still expect more, 492 * update our counters and loop. 493 * 4) if read() or SSL_read() signaled EOF, return. 494 * 5) if we did not receive any data but we're not at EOF, 495 * call select(). 496 * 497 * In the SSL case, this is necessary because if we 498 * receive a close notification, we have to call 499 * SSL_read() one additional time after we've read 500 * everything we received. 501 * 502 * In the non-SSL case, it may improve performance (very 503 * slightly) when reading small amounts of data. 504 */ 505#ifdef WITH_SSL 506 if (conn->ssl != NULL) 507 rlen = fetch_ssl_read(conn->ssl, buf, len); 508 else 509#endif 510 rlen = fetch_socket_read(conn->sd, buf, len); 511 if (rlen == 0) { 512 break; 513 } else if (rlen > 0) { 514 len -= rlen; 515 buf += rlen; 516 total += rlen; 517 continue; 518 } else if (rlen == FETCH_READ_ERROR) { 519 if (errno == EINTR) 520 fetch_cache_data(conn, start, total); 521 return (-1); 522 } 523 // assert(rlen == FETCH_READ_WAIT); 524 FD_ZERO(&readfds); 525 while (!FD_ISSET(conn->sd, &readfds)) { 526 FD_SET(conn->sd, &readfds); 527 if (fetchTimeout > 0) { 528 gettimeofday(&now, NULL); 529 if (!timercmp(&timeout, &now, >)) { 530 errno = ETIMEDOUT; 531 fetch_syserr(); 532 return (-1); 533 } 534 timersub(&timeout, &now, &delta); 535 } 536 errno = 0; 537 if (select(conn->sd + 1, &readfds, NULL, NULL, 538 fetchTimeout > 0 ? &delta : NULL) < 0) { 539 if (errno == EINTR) { 540 if (fetchRestartCalls) 541 continue; 542 /* Save anything that was read. */ 543 fetch_cache_data(conn, start, total); 544 } 545 fetch_syserr(); 546 return (-1); 547 } 548 } 549 } 550 return (total); 551} 552 553 554/* 555 * Read a line of text from a connection w/ timeout 556 */ 557#define MIN_BUF_SIZE 1024 558 559int 560fetch_getln(conn_t *conn) 561{ 562 char *tmp; 563 size_t tmpsize; 564 ssize_t len; 565 char c; 566 567 if (conn->buf == NULL) { 568 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 569 errno = ENOMEM; 570 return (-1); 571 } 572 conn->bufsize = MIN_BUF_SIZE; 573 } 574 575 conn->buf[0] = '\0'; 576 conn->buflen = 0; 577 578 do { 579 len = fetch_read(conn, &c, 1); 580 if (len == -1) 581 return (-1); 582 if (len == 0) 583 break; 584 conn->buf[conn->buflen++] = c; 585 if (conn->buflen == conn->bufsize) { 586 tmp = conn->buf; 587 tmpsize = conn->bufsize * 2 + 1; 588 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 589 errno = ENOMEM; 590 return (-1); 591 } 592 conn->buf = tmp; 593 conn->bufsize = tmpsize; 594 } 595 } while (c != '\n'); 596 597 conn->buf[conn->buflen] = '\0'; 598 DEBUG(fprintf(stderr, "<<< %s", conn->buf)); 599 return (0); 600} 601 602 603/* 604 * Write to a connection w/ timeout 605 */ 606ssize_t 607fetch_write(conn_t *conn, const char *buf, size_t len) 608{ 609 struct iovec iov; 610 611 iov.iov_base = __DECONST(char *, buf); 612 iov.iov_len = len; 613 return fetch_writev(conn, &iov, 1); 614} 615 616/* 617 * Write a vector to a connection w/ timeout 618 * Note: can modify the iovec. 619 */ 620ssize_t 621fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 622{ 623 struct timeval now, timeout, delta; 624 fd_set writefds; 625 ssize_t wlen, total; 626 int r; 627 628 if (fetchTimeout) { 629 FD_ZERO(&writefds); 630 gettimeofday(&timeout, NULL); 631 timeout.tv_sec += fetchTimeout; 632 } 633 634 total = 0; 635 while (iovcnt > 0) { 636 while (fetchTimeout && !FD_ISSET(conn->sd, &writefds)) { 637 FD_SET(conn->sd, &writefds); 638 gettimeofday(&now, NULL); 639 delta.tv_sec = timeout.tv_sec - now.tv_sec; 640 delta.tv_usec = timeout.tv_usec - now.tv_usec; 641 if (delta.tv_usec < 0) { 642 delta.tv_usec += 1000000; 643 delta.tv_sec--; 644 } 645 if (delta.tv_sec < 0) { 646 errno = ETIMEDOUT; 647 fetch_syserr(); 648 return (-1); 649 } 650 errno = 0; 651 r = select(conn->sd + 1, NULL, &writefds, NULL, &delta); 652 if (r == -1) { 653 if (errno == EINTR && fetchRestartCalls) 654 continue; 655 return (-1); 656 } 657 } 658 errno = 0; 659#ifdef WITH_SSL 660 if (conn->ssl != NULL) 661 wlen = SSL_write(conn->ssl, 662 iov->iov_base, iov->iov_len); 663 else 664#endif 665 wlen = writev(conn->sd, iov, iovcnt); 666 if (wlen == 0) { 667 /* we consider a short write a failure */ 668 /* XXX perhaps we shouldn't in the SSL case */ 669 errno = EPIPE; 670 fetch_syserr(); 671 return (-1); 672 } 673 if (wlen < 0) { 674 if (errno == EINTR && fetchRestartCalls) 675 continue; 676 return (-1); 677 } 678 total += wlen; 679 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 680 wlen -= iov->iov_len; 681 iov++; 682 iovcnt--; 683 } 684 if (iovcnt > 0) { 685 iov->iov_len -= wlen; 686 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 687 } 688 } 689 return (total); 690} 691 692 693/* 694 * Write a line of text to a connection w/ timeout 695 */ 696int 697fetch_putln(conn_t *conn, const char *str, size_t len) 698{ 699 struct iovec iov[2]; 700 int ret; 701 702 DEBUG(fprintf(stderr, ">>> %s\n", str)); 703 iov[0].iov_base = __DECONST(char *, str); 704 iov[0].iov_len = len; 705 iov[1].iov_base = __DECONST(char *, ENDL); 706 iov[1].iov_len = sizeof(ENDL); 707 if (len == 0) 708 ret = fetch_writev(conn, &iov[1], 1); 709 else 710 ret = fetch_writev(conn, iov, 2); 711 if (ret == -1) 712 return (-1); 713 return (0); 714} 715 716 717/* 718 * Close connection 719 */ 720int 721fetch_close(conn_t *conn) 722{ 723 int ret; 724 725 if (--conn->ref > 0) 726 return (0); 727 ret = close(conn->sd); 728 free(conn->cache.buf); 729 free(conn->buf); 730 free(conn); 731 return (ret); 732} 733 734 735/*** Directory-related utility functions *************************************/ 736 737int 738fetch_add_entry(struct url_ent **p, int *size, int *len, 739 const char *name, struct url_stat *us) 740{ 741 struct url_ent *tmp; 742 743 if (*p == NULL) { 744 *size = 0; 745 *len = 0; 746 } 747 748 if (*len >= *size - 1) { 749 tmp = realloc(*p, (*size * 2 + 1) * sizeof(**p)); 750 if (tmp == NULL) { 751 errno = ENOMEM; 752 fetch_syserr(); 753 return (-1); 754 } 755 *size = (*size * 2 + 1); 756 *p = tmp; 757 } 758 759 tmp = *p + *len; 760 snprintf(tmp->name, PATH_MAX, "%s", name); 761 memcpy(&tmp->stat, us, sizeof(*us)); 762 763 (*len)++; 764 (++tmp)->name[0] = 0; 765 766 return (0); 767} 768 769 770/*** Authentication-related utility functions ********************************/ 771 772static const char * 773fetch_read_word(FILE *f) 774{ 775 static char word[1024]; 776 777 if (fscanf(f, " %1023s ", word) != 1) 778 return (NULL); 779 return (word); 780} 781 782/* 783 * Get authentication data for a URL from .netrc 784 */ 785int 786fetch_netrc_auth(struct url *url) 787{ 788 char fn[PATH_MAX]; 789 const char *word; 790 char *p; 791 FILE *f; 792 793 if ((p = getenv("NETRC")) != NULL) { 794 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 795 fetch_info("$NETRC specifies a file name " 796 "longer than PATH_MAX"); 797 return (-1); 798 } 799 } else { 800 if ((p = getenv("HOME")) != NULL) { 801 struct passwd *pwd; 802 803 if ((pwd = getpwuid(getuid())) == NULL || 804 (p = pwd->pw_dir) == NULL) 805 return (-1); 806 } 807 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 808 return (-1); 809 } 810 811 if ((f = fopen(fn, "r")) == NULL) 812 return (-1); 813 while ((word = fetch_read_word(f)) != NULL) { 814 if (strcmp(word, "default") == 0) { 815 DEBUG(fetch_info("Using default .netrc settings")); 816 break; 817 } 818 if (strcmp(word, "machine") == 0 && 819 (word = fetch_read_word(f)) != NULL && 820 strcasecmp(word, url->host) == 0) { 821 DEBUG(fetch_info("Using .netrc settings for %s", word)); 822 break; 823 } 824 } 825 if (word == NULL) 826 goto ferr; 827 while ((word = fetch_read_word(f)) != NULL) { 828 if (strcmp(word, "login") == 0) { 829 if ((word = fetch_read_word(f)) == NULL) 830 goto ferr; 831 if (snprintf(url->user, sizeof(url->user), 832 "%s", word) > (int)sizeof(url->user)) { 833 fetch_info("login name in .netrc is too long"); 834 url->user[0] = '\0'; 835 } 836 } else if (strcmp(word, "password") == 0) { 837 if ((word = fetch_read_word(f)) == NULL) 838 goto ferr; 839 if (snprintf(url->pwd, sizeof(url->pwd), 840 "%s", word) > (int)sizeof(url->pwd)) { 841 fetch_info("password in .netrc is too long"); 842 url->pwd[0] = '\0'; 843 } 844 } else if (strcmp(word, "account") == 0) { 845 if ((word = fetch_read_word(f)) == NULL) 846 goto ferr; 847 /* XXX not supported! */ 848 } else { 849 break; 850 } 851 } 852 fclose(f); 853 return (0); 854 ferr: 855 fclose(f); 856 return (-1); 857} 858 859/* 860 * The no_proxy environment variable specifies a set of domains for 861 * which the proxy should not be consulted; the contents is a comma-, 862 * or space-separated list of domain names. A single asterisk will 863 * override all proxy variables and no transactions will be proxied 864 * (for compatability with lynx and curl, see the discussion at 865 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 866 */ 867int 868fetch_no_proxy_match(const char *host) 869{ 870 const char *no_proxy, *p, *q; 871 size_t h_len, d_len; 872 873 if ((no_proxy = getenv("NO_PROXY")) == NULL && 874 (no_proxy = getenv("no_proxy")) == NULL) 875 return (0); 876 877 /* asterisk matches any hostname */ 878 if (strcmp(no_proxy, "*") == 0) 879 return (1); 880 881 h_len = strlen(host); 882 p = no_proxy; 883 do { 884 /* position p at the beginning of a domain suffix */ 885 while (*p == ',' || isspace((unsigned char)*p)) 886 p++; 887 888 /* position q at the first separator character */ 889 for (q = p; *q; ++q) 890 if (*q == ',' || isspace((unsigned char)*q)) 891 break; 892 893 d_len = q - p; 894 if (d_len > 0 && h_len >= d_len && 895 strncasecmp(host + h_len - d_len, 896 p, d_len) == 0) { 897 /* domain name matches */ 898 return (1); 899 } 900 901 p = q + 1; 902 } while (*q); 903 904 return (0); 905} 906