common.c revision 230307
1228060Sbapt/*- 2228060Sbapt * Copyright (c) 1998-2011 Dag-Erling Sm��rgrav 3228060Sbapt * All rights reserved. 4228060Sbapt * 5228060Sbapt * Redistribution and use in source and binary forms, with or without 6228060Sbapt * modification, are permitted provided that the following conditions 7228060Sbapt * are met: 8228060Sbapt * 1. Redistributions of source code must retain the above copyright 9228060Sbapt * notice, this list of conditions and the following disclaimer 10228060Sbapt * in this position and unchanged. 11228060Sbapt * 2. Redistributions in binary form must reproduce the above copyright 12228060Sbapt * notice, this list of conditions and the following disclaimer in the 13228060Sbapt * documentation and/or other materials provided with the distribution. 14228060Sbapt * 3. The name of the author may not be used to endorse or promote products 15228060Sbapt * derived from this software without specific prior written permission 16228060Sbapt * 17228060Sbapt * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18228060Sbapt * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19228060Sbapt * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20228060Sbapt * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21228060Sbapt * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22228060Sbapt * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23228060Sbapt * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24228060Sbapt * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25228060Sbapt * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26228060Sbapt * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27228060Sbapt */ 28228060Sbapt 29228060Sbapt#include <sys/cdefs.h> 30228060Sbapt__FBSDID("$FreeBSD: head/lib/libfetch/common.c 230307 2012-01-18 15:13:21Z des $"); 31228060Sbapt 32228060Sbapt#include <sys/param.h> 33228060Sbapt#include <sys/socket.h> 34228060Sbapt#include <sys/time.h> 35228060Sbapt#include <sys/uio.h> 36228060Sbapt 37228060Sbapt#include <netinet/in.h> 38228060Sbapt 39228060Sbapt#include <ctype.h> 40228060Sbapt#include <errno.h> 41228060Sbapt#include <fcntl.h> 42228060Sbapt#include <netdb.h> 43228060Sbapt#include <pwd.h> 44228060Sbapt#include <stdarg.h> 45228060Sbapt#include <stdlib.h> 46228060Sbapt#include <stdio.h> 47228060Sbapt#include <string.h> 48228060Sbapt#include <unistd.h> 49228060Sbapt 50228060Sbapt#include "fetch.h" 51228060Sbapt#include "common.h" 52228060Sbapt 53228060Sbapt 54228060Sbapt/*** Local data **************************************************************/ 55228060Sbapt 56228060Sbapt/* 57228060Sbapt * Error messages for resolver errors 58228060Sbapt */ 59228060Sbaptstatic struct fetcherr netdb_errlist[] = { 60228060Sbapt#ifdef EAI_NODATA 61228060Sbapt { EAI_NODATA, FETCH_RESOLV, "Host not found" }, 62228060Sbapt#endif 63228060Sbapt { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, 64228060Sbapt { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, 65228060Sbapt { EAI_NONAME, FETCH_RESOLV, "No address record" }, 66228060Sbapt { -1, FETCH_UNKNOWN, "Unknown resolver error" } 67228060Sbapt}; 68228060Sbapt 69228060Sbapt/* End-of-Line */ 70228060Sbaptstatic const char ENDL[2] = "\r\n"; 7167064Sobrien 7267064Sobrien 7367064Sobrien/*** Error-reporting functions ***********************************************/ 7467064Sobrien 7567064Sobrien/* 7667064Sobrien * Map error code to string 7767064Sobrien */ 7867064Sobrienstatic struct fetcherr * 7967064Sobrienfetch_finderr(struct fetcherr *p, int e) 8067064Sobrien{ 8158551Skris while (p->num != -1 && p->num != e) 8258551Skris p++; 8358551Skris return (p); 8458551Skris} 8558551Skris 8658551Skris/* 8758551Skris * Set error code 8858551Skris */ 8958551Skrisvoid 9058551Skrisfetch_seterr(struct fetcherr *p, int e) 9158551Skris{ 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 errno = ENOMEM; 420 fetch_syserr(); 421 return (-1); 422 } 423 conn->cache.buf = tmp; 424 conn->cache.size = nbytes; 425 } 426 427 memcpy(conn->cache.buf, src, nbytes); 428 conn->cache.len = nbytes; 429 conn->cache.pos = 0; 430 431 return (0); 432} 433 434 435static ssize_t 436fetch_socket_read(int sd, char *buf, size_t len) 437{ 438 ssize_t rlen; 439 440 rlen = read(sd, buf, len); 441 if (rlen < 0) { 442 if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls)) 443 return (FETCH_READ_WAIT); 444 else 445 return (FETCH_READ_ERROR); 446 } 447 return (rlen); 448} 449 450/* 451 * Read a character from a connection w/ timeout 452 */ 453ssize_t 454fetch_read(conn_t *conn, char *buf, size_t len) 455{ 456 struct timeval now, timeout, delta; 457 fd_set readfds; 458 ssize_t rlen, total; 459 int r; 460 char *start; 461 462 if (fetchTimeout) { 463 FD_ZERO(&readfds); 464 gettimeofday(&timeout, NULL); 465 timeout.tv_sec += fetchTimeout; 466 } 467 468 total = 0; 469 start = buf; 470 471 if (conn->cache.len > 0) { 472 /* 473 * The last invocation of fetch_read was interrupted by a 474 * signal after some data had been read from the socket. Copy 475 * the cached data into the supplied buffer before trying to 476 * read from the socket again. 477 */ 478 total = (conn->cache.len < len) ? conn->cache.len : len; 479 memcpy(buf, conn->cache.buf, total); 480 481 conn->cache.len -= total; 482 conn->cache.pos += total; 483 len -= total; 484 buf+= total; 485 } 486 487 while (len > 0) { 488 /* 489 * The socket is non-blocking. Instead of the canonical 490 * select() -> read(), we do the following: 491 * 492 * 1) call read() or SSL_read(). 493 * 2) if an error occurred, return -1. 494 * 3) if we received data but we still expect more, 495 * update our counters and loop. 496 * 4) if read() or SSL_read() signaled EOF, return. 497 * 5) if we did not receive any data but we're not at EOF, 498 * call select(). 499 * 500 * In the SSL case, this is necessary because if we 501 * receive a close notification, we have to call 502 * SSL_read() one additional time after we've read 503 * everything we received. 504 * 505 * In the non-SSL case, it may improve performance (very 506 * slightly) when reading small amounts of data. 507 */ 508#ifdef WITH_SSL 509 if (conn->ssl != NULL) 510 rlen = fetch_ssl_read(conn->ssl, buf, len); 511 else 512#endif 513 rlen = fetch_socket_read(conn->sd, buf, len); 514 if (rlen == 0) { 515 break; 516 } else if (rlen > 0) { 517 len -= rlen; 518 buf += rlen; 519 total += rlen; 520 continue; 521 } else if (rlen == FETCH_READ_ERROR) { 522 if (errno == EINTR) 523 fetch_cache_data(conn, start, total); 524 return (-1); 525 } 526 // assert(rlen == FETCH_READ_WAIT); 527 while (fetchTimeout && !FD_ISSET(conn->sd, &readfds)) { 528 FD_SET(conn->sd, &readfds); 529 gettimeofday(&now, NULL); 530 delta.tv_sec = timeout.tv_sec - now.tv_sec; 531 delta.tv_usec = timeout.tv_usec - now.tv_usec; 532 if (delta.tv_usec < 0) { 533 delta.tv_usec += 1000000; 534 delta.tv_sec--; 535 } 536 if (delta.tv_sec < 0) { 537 errno = ETIMEDOUT; 538 fetch_syserr(); 539 return (-1); 540 } 541 errno = 0; 542 r = select(conn->sd + 1, &readfds, NULL, NULL, &delta); 543 if (r == -1) { 544 if (errno == EINTR) { 545 if (fetchRestartCalls) 546 continue; 547 /* Save anything that was read. */ 548 fetch_cache_data(conn, start, total); 549 } 550 fetch_syserr(); 551 return (-1); 552 } 553 } 554 } 555 return (total); 556} 557 558 559/* 560 * Read a line of text from a connection w/ timeout 561 */ 562#define MIN_BUF_SIZE 1024 563 564int 565fetch_getln(conn_t *conn) 566{ 567 char *tmp; 568 size_t tmpsize; 569 ssize_t len; 570 char c; 571 572 if (conn->buf == NULL) { 573 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 574 errno = ENOMEM; 575 return (-1); 576 } 577 conn->bufsize = MIN_BUF_SIZE; 578 } 579 580 conn->buf[0] = '\0'; 581 conn->buflen = 0; 582 583 do { 584 len = fetch_read(conn, &c, 1); 585 if (len == -1) 586 return (-1); 587 if (len == 0) 588 break; 589 conn->buf[conn->buflen++] = c; 590 if (conn->buflen == conn->bufsize) { 591 tmp = conn->buf; 592 tmpsize = conn->bufsize * 2 + 1; 593 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 594 errno = ENOMEM; 595 return (-1); 596 } 597 conn->buf = tmp; 598 conn->bufsize = tmpsize; 599 } 600 } while (c != '\n'); 601 602 conn->buf[conn->buflen] = '\0'; 603 DEBUG(fprintf(stderr, "<<< %s", conn->buf)); 604 return (0); 605} 606 607 608/* 609 * Write to a connection w/ timeout 610 */ 611ssize_t 612fetch_write(conn_t *conn, const char *buf, size_t len) 613{ 614 struct iovec iov; 615 616 iov.iov_base = __DECONST(char *, buf); 617 iov.iov_len = len; 618 return fetch_writev(conn, &iov, 1); 619} 620 621/* 622 * Write a vector to a connection w/ timeout 623 * Note: can modify the iovec. 624 */ 625ssize_t 626fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 627{ 628 struct timeval now, timeout, delta; 629 fd_set writefds; 630 ssize_t wlen, total; 631 int r; 632 633 if (fetchTimeout) { 634 FD_ZERO(&writefds); 635 gettimeofday(&timeout, NULL); 636 timeout.tv_sec += fetchTimeout; 637 } 638 639 total = 0; 640 while (iovcnt > 0) { 641 while (fetchTimeout && !FD_ISSET(conn->sd, &writefds)) { 642 FD_SET(conn->sd, &writefds); 643 gettimeofday(&now, NULL); 644 delta.tv_sec = timeout.tv_sec - now.tv_sec; 645 delta.tv_usec = timeout.tv_usec - now.tv_usec; 646 if (delta.tv_usec < 0) { 647 delta.tv_usec += 1000000; 648 delta.tv_sec--; 649 } 650 if (delta.tv_sec < 0) { 651 errno = ETIMEDOUT; 652 fetch_syserr(); 653 return (-1); 654 } 655 errno = 0; 656 r = select(conn->sd + 1, NULL, &writefds, NULL, &delta); 657 if (r == -1) { 658 if (errno == EINTR && fetchRestartCalls) 659 continue; 660 return (-1); 661 } 662 } 663 errno = 0; 664#ifdef WITH_SSL 665 if (conn->ssl != NULL) 666 wlen = SSL_write(conn->ssl, 667 iov->iov_base, iov->iov_len); 668 else 669#endif 670 wlen = writev(conn->sd, iov, iovcnt); 671 if (wlen == 0) { 672 /* we consider a short write a failure */ 673 /* XXX perhaps we shouldn't in the SSL case */ 674 errno = EPIPE; 675 fetch_syserr(); 676 return (-1); 677 } 678 if (wlen < 0) { 679 if (errno == EINTR && fetchRestartCalls) 680 continue; 681 return (-1); 682 } 683 total += wlen; 684 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 685 wlen -= iov->iov_len; 686 iov++; 687 iovcnt--; 688 } 689 if (iovcnt > 0) { 690 iov->iov_len -= wlen; 691 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 692 } 693 } 694 return (total); 695} 696 697 698/* 699 * Write a line of text to a connection w/ timeout 700 */ 701int 702fetch_putln(conn_t *conn, const char *str, size_t len) 703{ 704 struct iovec iov[2]; 705 int ret; 706 707 DEBUG(fprintf(stderr, ">>> %s\n", str)); 708 iov[0].iov_base = __DECONST(char *, str); 709 iov[0].iov_len = len; 710 iov[1].iov_base = __DECONST(char *, ENDL); 711 iov[1].iov_len = sizeof(ENDL); 712 if (len == 0) 713 ret = fetch_writev(conn, &iov[1], 1); 714 else 715 ret = fetch_writev(conn, iov, 2); 716 if (ret == -1) 717 return (-1); 718 return (0); 719} 720 721 722/* 723 * Close connection 724 */ 725int 726fetch_close(conn_t *conn) 727{ 728 int ret; 729 730 if (--conn->ref > 0) 731 return (0); 732 ret = close(conn->sd); 733 free(conn->cache.buf); 734 free(conn->buf); 735 free(conn); 736 return (ret); 737} 738 739 740/*** Directory-related utility functions *************************************/ 741 742int 743fetch_add_entry(struct url_ent **p, int *size, int *len, 744 const char *name, struct url_stat *us) 745{ 746 struct url_ent *tmp; 747 748 if (*p == NULL) { 749 *size = 0; 750 *len = 0; 751 } 752 753 if (*len >= *size - 1) { 754 tmp = realloc(*p, (*size * 2 + 1) * sizeof(**p)); 755 if (tmp == NULL) { 756 errno = ENOMEM; 757 fetch_syserr(); 758 return (-1); 759 } 760 *size = (*size * 2 + 1); 761 *p = tmp; 762 } 763 764 tmp = *p + *len; 765 snprintf(tmp->name, PATH_MAX, "%s", name); 766 memcpy(&tmp->stat, us, sizeof(*us)); 767 768 (*len)++; 769 (++tmp)->name[0] = 0; 770 771 return (0); 772} 773 774 775/*** Authentication-related utility functions ********************************/ 776 777static const char * 778fetch_read_word(FILE *f) 779{ 780 static char word[1024]; 781 782 if (fscanf(f, " %1023s ", word) != 1) 783 return (NULL); 784 return (word); 785} 786 787/* 788 * Get authentication data for a URL from .netrc 789 */ 790int 791fetch_netrc_auth(struct url *url) 792{ 793 char fn[PATH_MAX]; 794 const char *word; 795 char *p; 796 FILE *f; 797 798 if ((p = getenv("NETRC")) != NULL) { 799 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 800 fetch_info("$NETRC specifies a file name " 801 "longer than PATH_MAX"); 802 return (-1); 803 } 804 } else { 805 if ((p = getenv("HOME")) != NULL) { 806 struct passwd *pwd; 807 808 if ((pwd = getpwuid(getuid())) == NULL || 809 (p = pwd->pw_dir) == NULL) 810 return (-1); 811 } 812 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 813 return (-1); 814 } 815 816 if ((f = fopen(fn, "r")) == NULL) 817 return (-1); 818 while ((word = fetch_read_word(f)) != NULL) { 819 if (strcmp(word, "default") == 0) { 820 DEBUG(fetch_info("Using default .netrc settings")); 821 break; 822 } 823 if (strcmp(word, "machine") == 0 && 824 (word = fetch_read_word(f)) != NULL && 825 strcasecmp(word, url->host) == 0) { 826 DEBUG(fetch_info("Using .netrc settings for %s", word)); 827 break; 828 } 829 } 830 if (word == NULL) 831 goto ferr; 832 while ((word = fetch_read_word(f)) != NULL) { 833 if (strcmp(word, "login") == 0) { 834 if ((word = fetch_read_word(f)) == NULL) 835 goto ferr; 836 if (snprintf(url->user, sizeof(url->user), 837 "%s", word) > (int)sizeof(url->user)) { 838 fetch_info("login name in .netrc is too long"); 839 url->user[0] = '\0'; 840 } 841 } else if (strcmp(word, "password") == 0) { 842 if ((word = fetch_read_word(f)) == NULL) 843 goto ferr; 844 if (snprintf(url->pwd, sizeof(url->pwd), 845 "%s", word) > (int)sizeof(url->pwd)) { 846 fetch_info("password in .netrc is too long"); 847 url->pwd[0] = '\0'; 848 } 849 } else if (strcmp(word, "account") == 0) { 850 if ((word = fetch_read_word(f)) == NULL) 851 goto ferr; 852 /* XXX not supported! */ 853 } else { 854 break; 855 } 856 } 857 fclose(f); 858 return (0); 859 ferr: 860 fclose(f); 861 return (-1); 862} 863 864/* 865 * The no_proxy environment variable specifies a set of domains for 866 * which the proxy should not be consulted; the contents is a comma-, 867 * or space-separated list of domain names. A single asterisk will 868 * override all proxy variables and no transactions will be proxied 869 * (for compatability with lynx and curl, see the discussion at 870 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 871 */ 872int 873fetch_no_proxy_match(const char *host) 874{ 875 const char *no_proxy, *p, *q; 876 size_t h_len, d_len; 877 878 if ((no_proxy = getenv("NO_PROXY")) == NULL && 879 (no_proxy = getenv("no_proxy")) == NULL) 880 return (0); 881 882 /* asterisk matches any hostname */ 883 if (strcmp(no_proxy, "*") == 0) 884 return (1); 885 886 h_len = strlen(host); 887 p = no_proxy; 888 do { 889 /* position p at the beginning of a domain suffix */ 890 while (*p == ',' || isspace((unsigned char)*p)) 891 p++; 892 893 /* position q at the first separator character */ 894 for (q = p; *q; ++q) 895 if (*q == ',' || isspace((unsigned char)*q)) 896 break; 897 898 d_len = q - p; 899 if (d_len > 0 && h_len >= d_len && 900 strncasecmp(host + h_len - d_len, 901 p, d_len) == 0) { 902 /* domain name matches */ 903 return (1); 904 } 905 906 p = q + 1; 907 } while (*q); 908 909 return (0); 910} 911