1 /*- 2 * Copyright (c) 1998-2004 Dag-Erling Codan Smrgrav 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 "free2net.h" 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD: src/lib/libfetch/common.c,v 1.48.4.2 2006/11/11 00:16:07 des Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/socket.h> 36 #include <sys/time.h> 37 #include <sys/uio.h> 38 #include <netinet/in.h> 39 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; 240 241 memset(&hints, 0, sizeof(hints)); 242 hints.ai_family = af; 243 hints.ai_socktype = SOCK_STREAM; 244 hints.ai_protocol = 0; 245 if (getaddrinfo(addr, NULL, &hints, &res0) != 0) 246 return (-1); 247 for (res = res0; res; res = res->ai_next) 248 if (bind(sd, res->ai_addr, res->ai_addrlen) == 0) 249 return (0); 250 return (-1); 251 } 252 253 254 /* 255 * Establish a TCP connection to the specified port on the specified host. 256 */ 257 conn_t * 258 _fetch_connect(const char *host, int port, int af, int verbose) 259 { 260 conn_t *conn; 261 char pbuf[10]; 262 const char *bindaddr; 263 struct addrinfo hints, *res, *res0; 264 int sd, err; 265 266 DEBUG(fprintf(stderr, "---> %s:%d\n", host, port)); 267 268 if (verbose) 269 _fetch_info("looking up %s", host); 270 271 /* look up host name and set up socket address structure */ 272 snprintf(pbuf, sizeof(pbuf), "%d", port); 273 memset(&hints, 0, sizeof(hints)); 274 hints.ai_family = af; 275 hints.ai_socktype = SOCK_STREAM; 276 hints.ai_protocol = 0; 277 if ((err = getaddrinfo(host, pbuf, &hints, &res0)) != 0) { 278 _netdb_seterr(err); 279 return (NULL); 280 } 281 bindaddr = getenv("FETCH_BIND_ADDRESS"); 282 283 if (verbose) 284 _fetch_info("connecting to %s:%d", host, port); 285 286 /* try to connect */ 287 for (sd = -1, res = res0; res; sd = -1, res = res->ai_next) { 288 if ((sd = socket(res->ai_family, res->ai_socktype, 289 res->ai_protocol)) == -1) 290 continue; 291 if (bindaddr != NULL && *bindaddr != '\0' && 292 _fetch_bind(sd, res->ai_family, bindaddr) != 0) { 293 _fetch_info("failed to bind to '%s'", bindaddr); 294 close(sd); 295 continue; 296 } 297 if (connect(sd, res->ai_addr, res->ai_addrlen) == 0) 298 break; 299 close(sd); 300 } 301 freeaddrinfo(res0); 302 if (sd == -1) { 303 _fetch_syserr(); 304 return (NULL); 305 } 306 307 if ((conn = _fetch_reopen(sd)) == NULL) { 308 _fetch_syserr(); 309 close(sd); 310 } 311 return (conn); 312 } 313 314 315 /* 316 * Enable SSL on a connection. 317 */ 318 int 319 _fetch_ssl(conn_t *conn, int verbose) 320 { 321 322 #ifdef WITH_SSL 323 /* Init the SSL library and context */ 324 if (!SSL_library_init()){ 325 fprintf(stderr, "SSL library init failed\n"); 326 return (-1); 327 } 328 329 SSL_load_error_strings(); 330 331 conn->ssl_meth = SSLv23_client_method(); 332 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); 333 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 334 335 conn->ssl = SSL_new(conn->ssl_ctx); 336 if (conn->ssl == NULL){ 337 fprintf(stderr, "SSL context creation failed\n"); 338 return (-1); 339 } 340 SSL_set_fd(conn->ssl, conn->sd); 341 if (SSL_connect(conn->ssl) == -1){ 342 ERR_print_errors_fp(stderr); 343 return (-1); 344 } 345 346 if (verbose) { 347 X509_NAME *name; 348 char *str; 349 350 fprintf(stderr, "SSL connection established using %s\n", 351 SSL_get_cipher(conn->ssl)); 352 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 353 name = X509_get_subject_name(conn->ssl_cert); 354 str = X509_NAME_oneline(name, 0, 0); 355 printf("Certificate subject: %s\n", str); 356 free(str); 357 name = X509_get_issuer_name(conn->ssl_cert); 358 str = X509_NAME_oneline(name, 0, 0); 359 printf("Certificate issuer: %s\n", str); 360 free(str); 361 } 362 363 return (0); 364 #else 365 /* LINTED */ 366 (void)conn; 367 /* LINTED */ 368 (void)verbose; 369 fprintf(stderr, "SSL support disabled\n"); 370 return (-1); 371 #endif 372 } 373 374 375 /* 376 * Read a character from a connection w/ timeout 377 */ 378 ssize_t 379 _fetch_read(conn_t *conn, char *buf, size_t len) 380 { 381 struct timeval now, timeout, wait; 382 fd_set readfds; 383 ssize_t rlen, total; 384 int r; 385 386 if (fetchTimeout) { 387 FD_ZERO(&readfds); 388 gettimeofday(&timeout, NULL); 389 timeout.tv_sec += fetchTimeout; 390 } 391 392 total = 0; 393 while (len > 0) { 394 while (fetchTimeout && !FD_ISSET(conn->sd, &readfds)) { 395 FD_SET(conn->sd, &readfds); 396 gettimeofday(&now, NULL); 397 wait.tv_sec = timeout.tv_sec - now.tv_sec; 398 wait.tv_usec = timeout.tv_usec - now.tv_usec; 399 if (wait.tv_usec < 0) { 400 wait.tv_usec += 1000000; 401 wait.tv_sec--; 402 } 403 if (wait.tv_sec < 0) { 404 errno = ETIMEDOUT; 405 _fetch_syserr(); 406 return (-1); 407 } 408 errno = 0; 409 r = select(conn->sd + 1, &readfds, NULL, NULL, &wait); 410 if (r == -1) { 411 if (errno == EINTR && fetchRestartCalls) 412 continue; 413 _fetch_syserr(); 414 return (-1); 415 } 416 } 417 #ifdef WITH_SSL 418 if (conn->ssl != NULL) 419 rlen = SSL_read(conn->ssl, buf, len); 420 else 421 #endif 422 rlen = read(conn->sd, buf, len); 423 if (rlen == 0) 424 break; 425 if (rlen < 0) { 426 if (errno == EINTR && fetchRestartCalls) 427 continue; 428 return (-1); 429 } 430 len -= rlen; 431 buf += rlen; 432 total += rlen; 433 } 434 return (total); 435 } 436 437 438 /* 439 * Read a line of text from a connection w/ timeout 440 */ 441 #define MIN_BUF_SIZE 1024 442 443 int 444 _fetch_getln(conn_t *conn) 445 { 446 char *tmp; 447 size_t tmpsize; 448 ssize_t len; 449 char c; 450 451 if (conn->buf == NULL) { 452 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 453 errno = ENOMEM; 454 return (-1); 455 } 456 conn->bufsize = MIN_BUF_SIZE; 457 } 458 459 conn->buf[0] = '\0'; 460 conn->buflen = 0; 461 462 do { 463 len = _fetch_read(conn, &c, 1); 464 if (len == -1) 465 return (-1); 466 if (len == 0) 467 break; 468 conn->buf[conn->buflen++] = c; 469 if (conn->buflen == conn->bufsize) { 470 tmp = conn->buf; 471 tmpsize = conn->bufsize * 2 + 1; 472 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 473 errno = ENOMEM; 474 return (-1); 475 } 476 conn->buf = tmp; 477 conn->bufsize = tmpsize; 478 } 479 } while (c != '\n'); 480 481 conn->buf[conn->buflen] = '\0'; 482 DEBUG(fprintf(stderr, "<<< %s", conn->buf)); 483 return (0); 484 } 485 486 487 /* 488 * Write to a connection w/ timeout 489 */ 490 ssize_t 491 _fetch_write(conn_t *conn, const char *buf, size_t len) 492 { 493 struct iovec iov; 494 495 iov.iov_base = __DECONST(char *, buf); 496 iov.iov_len = len; 497 return _fetch_writev(conn, &iov, 1); 498 } 499 500 /* 501 * Write a vector to a connection w/ timeout 502 * Note: can modify the iovec. 503 */ 504 ssize_t 505 _fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 506 { 507 struct timeval now, timeout, wait; 508 fd_set writefds; 509 ssize_t wlen, total; 510 int r; 511 512 if (fetchTimeout) { 513 FD_ZERO(&writefds); 514 gettimeofday(&timeout, NULL); 515 timeout.tv_sec += fetchTimeout; 516 } 517 518 total = 0; 519 while (iovcnt > 0) { 520 while (fetchTimeout && !FD_ISSET(conn->sd, &writefds)) { 521 FD_SET(conn->sd, &writefds); 522 gettimeofday(&now, NULL); 523 wait.tv_sec = timeout.tv_sec - now.tv_sec; 524 wait.tv_usec = timeout.tv_usec - now.tv_usec; 525 if (wait.tv_usec < 0) { 526 wait.tv_usec += 1000000; 527 wait.tv_sec--; 528 } 529 if (wait.tv_sec < 0) { 530 errno = ETIMEDOUT; 531 _fetch_syserr(); 532 return (-1); 533 } 534 errno = 0; 535 r = select(conn->sd + 1, NULL, &writefds, NULL, &wait); 536 if (r == -1) { 537 if (errno == EINTR && fetchRestartCalls) 538 continue; 539 return (-1); 540 } 541 } 542 errno = 0; 543 #ifdef WITH_SSL 544 if (conn->ssl != NULL) 545 wlen = SSL_write(conn->ssl, 546 iov->iov_base, iov->iov_len); 547 else 548 #endif 549 wlen = writev(conn->sd, iov, iovcnt); 550 if (wlen == 0) { 551 /* we consider a short write a failure */ 552 errno = EPIPE; 553 _fetch_syserr(); 554 return (-1); 555 } 556 if (wlen < 0) { 557 if (errno == EINTR && fetchRestartCalls) 558 continue; 559 return (-1); 560 } 561 total += wlen; 562 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 563 wlen -= iov->iov_len; 564 iov++; 565 iovcnt--; 566 } 567 if (iovcnt > 0) { 568 iov->iov_len -= wlen; 569 iov->iov_base = (__DECONST(char *, iov->iov_base)) + wlen; 570 } 571 } 572 return (total); 573 } 574 575 576 /* 577 * Write a line of text to a connection w/ timeout 578 */ 579 int 580 _fetch_putln(conn_t *conn, const char *str, size_t len) 581 { 582 struct iovec iov[2]; 583 int ret; 584 585 DEBUG(fprintf(stderr, ">>> %s\n", str)); 586 iov[0].iov_base = __DECONST(char *, str); 587 iov[0].iov_len = len; 588 iov[1].iov_base = __DECONST(char *, ENDL); 589 iov[1].iov_len = sizeof(ENDL); 590 if (len == 0) 591 ret = _fetch_writev(conn, &iov[1], 1); 592 else 593 ret = _fetch_writev(conn, iov, 2); 594 if (ret == -1) 595 return (-1); 596 return (0); 597 } 598 599 600 /* 601 * Close connection 602 */ 603 int 604 _fetch_close(conn_t *conn) 605 { 606 int ret; 607 608 if (--conn->ref > 0) 609 return (0); 610 ret = close(conn->sd); 611 free(conn->buf); 612 free(conn); 613 return (ret); 614 } 615 616 617 /*** Directory-related utility functions *************************************/ 618 619 int 620 _fetch_add_entry(struct url_ent **p, int *size, int *len, 621 const char *name, struct url_stat *us) 622 { 623 struct url_ent *tmp; 624 625 if (*p == NULL) { 626 *size = 0; 627 *len = 0; 628 } 629 630 if (*len >= *size - 1) { 631 tmp = realloc(*p, (*size * 2 + 1) * sizeof(**p)); 632 if (tmp == NULL) { 633 errno = ENOMEM; 634 _fetch_syserr(); 635 return (-1); 636 } 637 *size = (*size * 2 + 1); 638 *p = tmp; 639 } 640 641 tmp = *p + *len; 642 snprintf(tmp->name, PATH_MAX, "%s", name); 643 bcopy(us, &tmp->stat, sizeof(*us)); 644 645 (*len)++; 646 (++tmp)->name[0] = 0; 647 648 return (0); 649 } 650 651 652 /*** Authentication-related utility functions ********************************/ 653 654 static const char * 655 _fetch_read_word(FILE *f) 656 { 657 static char word[1024]; 658 659 if (fscanf(f, " %1024s ", word) != 1) 660 return (NULL); 661 return (word); 662 } 663 664 /* 665 * Get authentication data for a URL from .netrc 666 */ 667 int 668 _fetch_netrc_auth(struct url *url) 669 { 670 char fn[PATH_MAX]; 671 const char *word; 672 char *p; 673 FILE *f; 674 675 if ((p = getenv("NETRC")) != NULL) { 676 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 677 _fetch_info("$NETRC specifies a file name " 678 "longer than PATH_MAX"); 679 return (-1); 680 } 681 } else { 682 if ((p = getenv("HOME")) != NULL) { 683 struct passwd *pwd; 684 685 if ((pwd = getpwuid(getuid())) == NULL || 686 (p = pwd->pw_dir) == NULL) 687 return (-1); 688 } 689 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 690 return (-1); 691 } 692 693 if ((f = fopen(fn, "r")) == NULL) 694 return (-1); 695 while ((word = _fetch_read_word(f)) != NULL) { 696 if (strcmp(word, "default") == 0) { 697 DEBUG(_fetch_info("Using default .netrc settings")); 698 break; 699 } 700 if (strcmp(word, "machine") == 0 && 701 (word = _fetch_read_word(f)) != NULL && 702 strcasecmp(word, url->host) == 0) { 703 DEBUG(_fetch_info("Using .netrc settings for %s", word)); 704 break; 705 } 706 } 707 if (word == NULL) 708 goto ferr; 709 while ((word = _fetch_read_word(f)) != NULL) { 710 if (strcmp(word, "login") == 0) { 711 if ((word = _fetch_read_word(f)) == NULL) 712 goto ferr; 713 if (snprintf(url->user, sizeof(url->user), 714 "%s", word) > (int)sizeof(url->user)) { 715 _fetch_info("login name in .netrc is too long"); 716 url->user[0] = '\0'; 717 } 718 } else if (strcmp(word, "password") == 0) { 719 if ((word = _fetch_read_word(f)) == NULL) 720 goto ferr; 721 if (snprintf(url->pwd, sizeof(url->pwd), 722 "%s", word) > (int)sizeof(url->pwd)) { 723 _fetch_info("password in .netrc is too long"); 724 url->pwd[0] = '\0'; 725 } 726 } else if (strcmp(word, "account") == 0) { 727 if ((word = _fetch_read_word(f)) == NULL) 728 goto ferr; 729 /* XXX not supported! */ 730 } else { 731 break; 732 } 733 } 734 fclose(f); 735 return (0); 736 ferr: 737 fclose(f); 738 return (-1); 739 } 740
Indexes created Sat Sep 20 22:09:52 GMT 2025