common.c revision 236193
1103285Sikob/*- 2103285Sikob * Copyright (c) 1998-2011 Dag-Erling Sm��rgrav 3103285Sikob * All rights reserved. 4103285Sikob * 5103285Sikob * Redistribution and use in source and binary forms, with or without 6103285Sikob * modification, are permitted provided that the following conditions 7103285Sikob * are met: 8103285Sikob * 1. Redistributions of source code must retain the above copyright 9103285Sikob * notice, this list of conditions and the following disclaimer 10103285Sikob * in this position and unchanged. 11103285Sikob * 2. Redistributions in binary form must reproduce the above copyright 12103285Sikob * notice, this list of conditions and the following disclaimer in the 13103285Sikob * documentation and/or other materials provided with the distribution. 14103285Sikob * 3. The name of the author may not be used to endorse or promote products 15103285Sikob * derived from this software without specific prior written permission 16103285Sikob * 17103285Sikob * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18103285Sikob * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19103285Sikob * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20103285Sikob * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21103285Sikob * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22103285Sikob * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23103285Sikob * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24103285Sikob * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25103285Sikob * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26103285Sikob * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27103285Sikob */ 28103285Sikob 29103285Sikob#include <sys/cdefs.h> 30103285Sikob__FBSDID("$FreeBSD: head/lib/libfetch/common.c 236193 2012-05-28 19:22:23Z jilles $"); 31103285Sikob 32103285Sikob#include <sys/param.h> 33103285Sikob#include <sys/socket.h> 34103285Sikob#include <sys/time.h> 35103285Sikob#include <sys/uio.h> 36103285Sikob 37103285Sikob#include <netinet/in.h> 38103285Sikob 39103285Sikob#include <ctype.h> 40103285Sikob#include <errno.h> 41103285Sikob#include <fcntl.h> 42103285Sikob#include <netdb.h> 43103285Sikob#include <pwd.h> 44103285Sikob#include <stdarg.h> 45103285Sikob#include <stdlib.h> 46103285Sikob#include <stdio.h> 47103285Sikob#include <string.h> 48103285Sikob#include <unistd.h> 49103285Sikob 50103285Sikob#include "fetch.h" 51103285Sikob#include "common.h" 52103285Sikob 53103285Sikob 54103285Sikob/*** Local data **************************************************************/ 55103285Sikob 56103285Sikob/* 57106810Ssimokawa * Error messages for resolver errors 58106810Ssimokawa */ 59103285Sikobstatic struct fetcherr netdb_errlist[] = { 60103285Sikob#ifdef EAI_NODATA 61108281Ssimokawa { EAI_NODATA, FETCH_RESOLV, "Host not found" }, 62106810Ssimokawa#endif 63106810Ssimokawa { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, 64106810Ssimokawa { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, 65106810Ssimokawa { EAI_NONAME, FETCH_RESOLV, "No address record" }, 66103285Sikob { -1, FETCH_UNKNOWN, "Unknown resolver error" } 67103285Sikob}; 68103285Sikob 69103285Sikob/* End-of-Line */ 70103285Sikobstatic const char ENDL[2] = "\r\n"; 71106816Ssimokawa 72106816Ssimokawa 73106816Ssimokawa/*** Error-reporting functions ***********************************************/ 74106816Ssimokawa 75106816Ssimokawa/* 76106810Ssimokawa * Map error code to string 77106816Ssimokawa */ 78106816Ssimokawastatic struct fetcherr * 79106816Ssimokawafetch_finderr(struct fetcherr *p, int e) 80106816Ssimokawa{ 81103285Sikob while (p->num != -1 && p->num != e) 82103285Sikob p++; 83103285Sikob return (p); 84103285Sikob} 85106804Ssimokawa 86103285Sikob/* 87106804Ssimokawa * Set error code 88106810Ssimokawa */ 89106810Ssimokawavoid 90106816Ssimokawafetch_seterr(struct fetcherr *p, int e) 91106816Ssimokawa{ 92106816Ssimokawa p = fetch_finderr(p, e); 93106816Ssimokawa fetchLastErrCode = p->cat; 94106816Ssimokawa snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string); 95106816Ssimokawa} 96106804Ssimokawa 97106816Ssimokawa/* 98106816Ssimokawa * Set error code according to errno 99106816Ssimokawa */ 100106816Ssimokawavoid 101106804Ssimokawafetch_syserr(void) 102103285Sikob{ 103106804Ssimokawa switch (errno) { 104103285Sikob case 0: 105106816Ssimokawa fetchLastErrCode = FETCH_OK; 106103285Sikob break; 107106816Ssimokawa case EPERM: 108106816Ssimokawa case EACCES: 109106816Ssimokawa case EROFS: 110106816Ssimokawa case EAUTH: 111106816Ssimokawa case ENEEDAUTH: 112106816Ssimokawa fetchLastErrCode = FETCH_AUTH; 113106816Ssimokawa break; 114106816Ssimokawa case ENOENT: 115106816Ssimokawa case EISDIR: /* XXX */ 116106816Ssimokawa fetchLastErrCode = FETCH_UNAVAIL; 117106816Ssimokawa break; 118106816Ssimokawa case ENOMEM: 119106816Ssimokawa fetchLastErrCode = FETCH_MEMORY; 120106816Ssimokawa break; 121106816Ssimokawa case EBUSY: 122106816Ssimokawa case EAGAIN: 123106816Ssimokawa fetchLastErrCode = FETCH_TEMP; 124106816Ssimokawa break; 125106816Ssimokawa case EEXIST: 126103285Sikob fetchLastErrCode = FETCH_EXISTS; 127103285Sikob break; 128103285Sikob case ENOSPC: 129103285Sikob fetchLastErrCode = FETCH_FULL; 130103285Sikob break; 131103285Sikob case EADDRINUSE: 132103285Sikob case EADDRNOTAVAIL: 133106816Ssimokawa case ENETDOWN: 134106816Ssimokawa case ENETUNREACH: 135106804Ssimokawa case ENETRESET: 136106810Ssimokawa case EHOSTUNREACH: 137103285Sikob fetchLastErrCode = FETCH_NETWORK; 138106804Ssimokawa break; 139103285Sikob case ECONNABORTED: 140103285Sikob case ECONNRESET: 141103285Sikob fetchLastErrCode = FETCH_ABORT; 142103285Sikob break; 143103285Sikob case ETIMEDOUT: 144106810Ssimokawa fetchLastErrCode = FETCH_TIMEOUT; 145106810Ssimokawa break; 146106810Ssimokawa case ECONNREFUSED: 147106810Ssimokawa case EHOSTDOWN: 148106810Ssimokawa fetchLastErrCode = FETCH_DOWN; 149106810Ssimokawa break; 150106810Ssimokawadefault: 151106810Ssimokawa fetchLastErrCode = FETCH_UNKNOWN; 152106810Ssimokawa } 153106810Ssimokawa snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno)); 154106810Ssimokawa} 155106810Ssimokawa 156106816Ssimokawa 157106810Ssimokawa/* 158106810Ssimokawa * Emit status message 159106810Ssimokawa */ 160106810Ssimokawavoid 161110072Ssimokawafetch_info(const char *fmt, ...) 162106810Ssimokawa{ 163106810Ssimokawa va_list ap; 164106810Ssimokawa 165106810Ssimokawa va_start(ap, fmt); 166106810Ssimokawa vfprintf(stderr, fmt, ap); 167106810Ssimokawa va_end(ap); 168106810Ssimokawa fputc('\n', stderr); 169106816Ssimokawa} 170106816Ssimokawa 171106810Ssimokawa 172106810Ssimokawa/*** Network-related utility functions ***************************************/ 173106810Ssimokawa 174106810Ssimokawa/* 175106810Ssimokawa * Return the default port for a scheme 176106810Ssimokawa */ 177106810Ssimokawaint 178106810Ssimokawafetch_default_port(const char *scheme) 179106810Ssimokawa{ 180103285Sikob struct servent *se; 181106810Ssimokawa 182106810Ssimokawa if ((se = getservbyname(scheme, "tcp")) != NULL) 183106804Ssimokawa return (ntohs(se->s_port)); 184103285Sikob if (strcasecmp(scheme, SCHEME_FTP) == 0) 185103285Sikob return (FTP_DEFAULT_PORT); 186106804Ssimokawa if (strcasecmp(scheme, SCHEME_HTTP) == 0) 187106804Ssimokawa return (HTTP_DEFAULT_PORT); 188103285Sikob return (0); 189103285Sikob} 190103285Sikob 191103285Sikob/* 192106816Ssimokawa * Return the default proxy port for a scheme 193106804Ssimokawa */ 194103285Sikobint 195106804Ssimokawafetch_default_proxy_port(const char *scheme) 196103285Sikob{ 197103285Sikob if (strcasecmp(scheme, SCHEME_FTP) == 0) 198103285Sikob return (FTP_DEFAULT_PROXY_PORT); 199103285Sikob if (strcasecmp(scheme, SCHEME_HTTP) == 0) 200103285Sikob return (HTTP_DEFAULT_PROXY_PORT); 201103285Sikob return (0); 202103285Sikob} 203103285Sikob 204106816Ssimokawa 205106810Ssimokawa/* 206106810Ssimokawa * Create a connection for an existing descriptor. 207103285Sikob */ 208106804Ssimokawaconn_t * 209103285Sikobfetch_reopen(int sd) 210103285Sikob{ 211103285Sikob conn_t *conn; 212103285Sikob int opt = 1; 213103285Sikob 214103285Sikob /* allocate and fill connection structure */ 215103285Sikob if ((conn = calloc(1, sizeof(*conn))) == NULL) 216103285Sikob return (NULL); 217103285Sikob fcntl(sd, F_SETFD, FD_CLOEXEC); 218103285Sikob setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof opt); 219103285Sikob conn->sd = sd; 220103285Sikob ++conn->ref; 221103285Sikob return (conn); 222103285Sikob} 223103285Sikob 224103285Sikob 225103285Sikob/* 226103285Sikob * Bump a connection's reference count. 227103285Sikob */ 228103285Sikobconn_t * 229103285Sikobfetch_ref(conn_t *conn) 230103285Sikob{ 231103285Sikob 232103285Sikob ++conn->ref; 233106810Ssimokawa return (conn); 234103285Sikob} 235103285Sikob 236103285Sikob 237103285Sikob/* 238103285Sikob * Bind a socket to a specific local address 239103285Sikob */ 240103285Sikobint 241103285Sikobfetch_bind(int sd, int af, const char *addr) 242103285Sikob{ 243110072Ssimokawa struct addrinfo hints, *res, *res0; 244106810Ssimokawa int err; 245106810Ssimokawa 246106810Ssimokawa memset(&hints, 0, sizeof(hints)); 247106810Ssimokawa hints.ai_family = af; 248106810Ssimokawa hints.ai_socktype = SOCK_STREAM; 249103285Sikob hints.ai_protocol = 0; 250103285Sikob if ((err = getaddrinfo(addr, NULL, &hints, &res0)) != 0) 251103285Sikob return (-1); 252103285Sikob for (res = res0; res; res = res->ai_next) 253103285Sikob if (bind(sd, res->ai_addr, res->ai_addrlen) == 0) 254103285Sikob return (0); 255103285Sikob return (-1); 256103285Sikob} 257103285Sikob 258103285Sikob 259106810Ssimokawa/* 260106804Ssimokawa * Establish a TCP connection to the specified port on the specified host. 261106804Ssimokawa */ 262106804Ssimokawaconn_t * 263106804Ssimokawafetch_connect(const char *host, int port, int af, int verbose) 264106804Ssimokawa{ 265103285Sikob conn_t *conn; 266103285Sikob char pbuf[10]; 267103285Sikob const char *bindaddr; 268103285Sikob struct addrinfo hints, *res, *res0; 269103285Sikob int sd, err; 270103285Sikob 271103285Sikob DEBUG(fprintf(stderr, "---> %s:%d\n", host, port)); 272106810Ssimokawa 273106804Ssimokawa if (verbose) 274106804Ssimokawa fetch_info("looking up %s", host); 275106804Ssimokawa 276106804Ssimokawa /* look up host name and set up socket address structure */ 277106804Ssimokawa snprintf(pbuf, sizeof(pbuf), "%d", port); 278103285Sikob memset(&hints, 0, sizeof(hints)); 279103285Sikob hints.ai_family = af; 280103285Sikob hints.ai_socktype = SOCK_STREAM; 281103285Sikob hints.ai_protocol = 0; 282103285Sikob if ((err = getaddrinfo(host, pbuf, &hints, &res0)) != 0) { 283103285Sikob netdb_seterr(err); 284103285Sikob return (NULL); 285103285Sikob } 286103285Sikob bindaddr = getenv("FETCH_BIND_ADDRESS"); 287103285Sikob 288103285Sikob if (verbose) 289103285Sikob fetch_info("connecting to %s:%d", host, port); 290103285Sikob 291103285Sikob /* try to connect */ 292103285Sikob for (sd = -1, res = res0; res; sd = -1, res = res->ai_next) { 293103285Sikob if ((sd = socket(res->ai_family, res->ai_socktype, 294103285Sikob res->ai_protocol)) == -1) 295103285Sikob continue; 296103285Sikob if (bindaddr != NULL && *bindaddr != '\0' && 297103285Sikob fetch_bind(sd, res->ai_family, bindaddr) != 0) { 298103285Sikob fetch_info("failed to bind to '%s'", bindaddr); 299103285Sikob close(sd); 300103285Sikob continue; 301103285Sikob } 302103285Sikob if (connect(sd, res->ai_addr, res->ai_addrlen) == 0 && 303103285Sikob fcntl(sd, F_SETFL, O_NONBLOCK) == 0) 304103285Sikob break; 305103285Sikob close(sd); 306103285Sikob } 307103285Sikob freeaddrinfo(res0); 308103285Sikob if (sd == -1) { 309 fetch_syserr(); 310 return (NULL); 311 } 312 313 if ((conn = fetch_reopen(sd)) == NULL) { 314 fetch_syserr(); 315 close(sd); 316 } 317 return (conn); 318} 319 320 321/* 322 * Enable SSL on a connection. 323 */ 324int 325fetch_ssl(conn_t *conn, int verbose) 326{ 327#ifdef WITH_SSL 328 int ret, ssl_err; 329 330 /* Init the SSL library and context */ 331 if (!SSL_library_init()){ 332 fprintf(stderr, "SSL library init failed\n"); 333 return (-1); 334 } 335 336 SSL_load_error_strings(); 337 338 conn->ssl_meth = SSLv23_client_method(); 339 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); 340 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 341 342 conn->ssl = SSL_new(conn->ssl_ctx); 343 if (conn->ssl == NULL){ 344 fprintf(stderr, "SSL context creation failed\n"); 345 return (-1); 346 } 347 SSL_set_fd(conn->ssl, conn->sd); 348 while ((ret = SSL_connect(conn->ssl)) == -1) { 349 ssl_err = SSL_get_error(conn->ssl, ret); 350 if (ssl_err != SSL_ERROR_WANT_READ && 351 ssl_err != SSL_ERROR_WANT_WRITE) { 352 ERR_print_errors_fp(stderr); 353 return (-1); 354 } 355 } 356 357 if (verbose) { 358 X509_NAME *name; 359 char *str; 360 361 fprintf(stderr, "SSL connection established using %s\n", 362 SSL_get_cipher(conn->ssl)); 363 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 364 name = X509_get_subject_name(conn->ssl_cert); 365 str = X509_NAME_oneline(name, 0, 0); 366 printf("Certificate subject: %s\n", str); 367 free(str); 368 name = X509_get_issuer_name(conn->ssl_cert); 369 str = X509_NAME_oneline(name, 0, 0); 370 printf("Certificate issuer: %s\n", str); 371 free(str); 372 } 373 374 return (0); 375#else 376 (void)conn; 377 (void)verbose; 378 fprintf(stderr, "SSL support disabled\n"); 379 return (-1); 380#endif 381} 382 383#define FETCH_READ_WAIT -2 384#define FETCH_READ_ERROR -1 385#define FETCH_READ_DONE 0 386 387#ifdef WITH_SSL 388static ssize_t 389fetch_ssl_read(SSL *ssl, char *buf, size_t len) 390{ 391 ssize_t rlen; 392 int ssl_err; 393 394 rlen = SSL_read(ssl, buf, len); 395 if (rlen < 0) { 396 ssl_err = SSL_get_error(ssl, rlen); 397 if (ssl_err == SSL_ERROR_WANT_READ || 398 ssl_err == SSL_ERROR_WANT_WRITE) { 399 return (FETCH_READ_WAIT); 400 } else { 401 ERR_print_errors_fp(stderr); 402 return (FETCH_READ_ERROR); 403 } 404 } 405 return (rlen); 406} 407#endif 408 409/* 410 * Cache some data that was read from a socket but cannot be immediately 411 * returned because of an interrupted system call. 412 */ 413static int 414fetch_cache_data(conn_t *conn, char *src, size_t nbytes) 415{ 416 char *tmp; 417 418 if (conn->cache.size < nbytes) { 419 tmp = realloc(conn->cache.buf, nbytes); 420 if (tmp == NULL) { 421 fetch_syserr(); 422 return (-1); 423 } 424 conn->cache.buf = tmp; 425 conn->cache.size = nbytes; 426 } 427 428 memcpy(conn->cache.buf, src, nbytes); 429 conn->cache.len = nbytes; 430 conn->cache.pos = 0; 431 432 return (0); 433} 434 435 436static ssize_t 437fetch_socket_read(int sd, char *buf, size_t len) 438{ 439 ssize_t rlen; 440 441 rlen = read(sd, buf, len); 442 if (rlen < 0) { 443 if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls)) 444 return (FETCH_READ_WAIT); 445 else 446 return (FETCH_READ_ERROR); 447 } 448 return (rlen); 449} 450 451/* 452 * Read a character from a connection w/ timeout 453 */ 454ssize_t 455fetch_read(conn_t *conn, char *buf, size_t len) 456{ 457 struct timeval now, timeout, delta; 458 fd_set readfds; 459 ssize_t rlen, total; 460 char *start; 461 462 if (fetchTimeout > 0) { 463 gettimeofday(&timeout, NULL); 464 timeout.tv_sec += fetchTimeout; 465 } 466 467 total = 0; 468 start = buf; 469 470 if (conn->cache.len > 0) { 471 /* 472 * The last invocation of fetch_read was interrupted by a 473 * signal after some data had been read from the socket. Copy 474 * the cached data into the supplied buffer before trying to 475 * read from the socket again. 476 */ 477 total = (conn->cache.len < len) ? conn->cache.len : len; 478 memcpy(buf, conn->cache.buf, total); 479 480 conn->cache.len -= total; 481 conn->cache.pos += total; 482 len -= total; 483 buf += total; 484 } 485 486 while (len > 0) { 487 /* 488 * The socket is non-blocking. Instead of the canonical 489 * select() -> read(), we do the following: 490 * 491 * 1) call read() or SSL_read(). 492 * 2) if an error occurred, return -1. 493 * 3) if we received data but we still expect more, 494 * update our counters and loop. 495 * 4) if read() or SSL_read() signaled EOF, return. 496 * 5) if we did not receive any data but we're not at EOF, 497 * call select(). 498 * 499 * In the SSL case, this is necessary because if we 500 * receive a close notification, we have to call 501 * SSL_read() one additional time after we've read 502 * everything we received. 503 * 504 * In the non-SSL case, it may improve performance (very 505 * slightly) when reading small amounts of data. 506 */ 507#ifdef WITH_SSL 508 if (conn->ssl != NULL) 509 rlen = fetch_ssl_read(conn->ssl, buf, len); 510 else 511#endif 512 rlen = fetch_socket_read(conn->sd, buf, len); 513 if (rlen == 0) { 514 break; 515 } else if (rlen > 0) { 516 len -= rlen; 517 buf += rlen; 518 total += rlen; 519 continue; 520 } else if (rlen == FETCH_READ_ERROR) { 521 if (errno == EINTR) 522 fetch_cache_data(conn, start, total); 523 return (-1); 524 } 525 // assert(rlen == FETCH_READ_WAIT); 526 FD_ZERO(&readfds); 527 while (!FD_ISSET(conn->sd, &readfds)) { 528 FD_SET(conn->sd, &readfds); 529 if (fetchTimeout > 0) { 530 gettimeofday(&now, NULL); 531 if (!timercmp(&timeout, &now, >)) { 532 errno = ETIMEDOUT; 533 fetch_syserr(); 534 return (-1); 535 } 536 timersub(&timeout, &now, &delta); 537 } 538 errno = 0; 539 if (select(conn->sd + 1, &readfds, NULL, NULL, 540 fetchTimeout > 0 ? &delta : NULL) < 0) { 541 if (errno == EINTR) { 542 if (fetchRestartCalls) 543 continue; 544 /* Save anything that was read. */ 545 fetch_cache_data(conn, start, total); 546 } 547 fetch_syserr(); 548 return (-1); 549 } 550 } 551 } 552 return (total); 553} 554 555 556/* 557 * Read a line of text from a connection w/ timeout 558 */ 559#define MIN_BUF_SIZE 1024 560 561int 562fetch_getln(conn_t *conn) 563{ 564 char *tmp; 565 size_t tmpsize; 566 ssize_t len; 567 char c; 568 569 if (conn->buf == NULL) { 570 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 571 errno = ENOMEM; 572 return (-1); 573 } 574 conn->bufsize = MIN_BUF_SIZE; 575 } 576 577 conn->buf[0] = '\0'; 578 conn->buflen = 0; 579 580 do { 581 len = fetch_read(conn, &c, 1); 582 if (len == -1) 583 return (-1); 584 if (len == 0) 585 break; 586 conn->buf[conn->buflen++] = c; 587 if (conn->buflen == conn->bufsize) { 588 tmp = conn->buf; 589 tmpsize = conn->bufsize * 2 + 1; 590 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 591 errno = ENOMEM; 592 return (-1); 593 } 594 conn->buf = tmp; 595 conn->bufsize = tmpsize; 596 } 597 } while (c != '\n'); 598 599 conn->buf[conn->buflen] = '\0'; 600 DEBUG(fprintf(stderr, "<<< %s", conn->buf)); 601 return (0); 602} 603 604 605/* 606 * Write to a connection w/ timeout 607 */ 608ssize_t 609fetch_write(conn_t *conn, const char *buf, size_t len) 610{ 611 struct iovec iov; 612 613 iov.iov_base = __DECONST(char *, buf); 614 iov.iov_len = len; 615 return fetch_writev(conn, &iov, 1); 616} 617 618/* 619 * Write a vector to a connection w/ timeout 620 * Note: can modify the iovec. 621 */ 622ssize_t 623fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 624{ 625 struct timeval now, timeout, delta; 626 fd_set writefds; 627 ssize_t wlen, total; 628 int r; 629 630 if (fetchTimeout) { 631 FD_ZERO(&writefds); 632 gettimeofday(&timeout, NULL); 633 timeout.tv_sec += fetchTimeout; 634 } 635 636 total = 0; 637 while (iovcnt > 0) { 638 while (fetchTimeout && !FD_ISSET(conn->sd, &writefds)) { 639 FD_SET(conn->sd, &writefds); 640 gettimeofday(&now, NULL); 641 delta.tv_sec = timeout.tv_sec - now.tv_sec; 642 delta.tv_usec = timeout.tv_usec - now.tv_usec; 643 if (delta.tv_usec < 0) { 644 delta.tv_usec += 1000000; 645 delta.tv_sec--; 646 } 647 if (delta.tv_sec < 0) { 648 errno = ETIMEDOUT; 649 fetch_syserr(); 650 return (-1); 651 } 652 errno = 0; 653 r = select(conn->sd + 1, NULL, &writefds, NULL, &delta); 654 if (r == -1) { 655 if (errno == EINTR && fetchRestartCalls) 656 continue; 657 return (-1); 658 } 659 } 660 errno = 0; 661#ifdef WITH_SSL 662 if (conn->ssl != NULL) 663 wlen = SSL_write(conn->ssl, 664 iov->iov_base, iov->iov_len); 665 else 666#endif 667 wlen = writev(conn->sd, iov, iovcnt); 668 if (wlen == 0) { 669 /* we consider a short write a failure */ 670 /* XXX perhaps we shouldn't in the SSL case */ 671 errno = EPIPE; 672 fetch_syserr(); 673 return (-1); 674 } 675 if (wlen < 0) { 676 if (errno == EINTR && fetchRestartCalls) 677 continue; 678 return (-1); 679 } 680 total += wlen; 681 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 682 wlen -= iov->iov_len; 683 iov++; 684 iovcnt--; 685 } 686 if (iovcnt > 0) { 687 iov->iov_len -= wlen; 688 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 689 } 690 } 691 return (total); 692} 693 694 695/* 696 * Write a line of text to a connection w/ timeout 697 */ 698int 699fetch_putln(conn_t *conn, const char *str, size_t len) 700{ 701 struct iovec iov[2]; 702 int ret; 703 704 DEBUG(fprintf(stderr, ">>> %s\n", str)); 705 iov[0].iov_base = __DECONST(char *, str); 706 iov[0].iov_len = len; 707 iov[1].iov_base = __DECONST(char *, ENDL); 708 iov[1].iov_len = sizeof(ENDL); 709 if (len == 0) 710 ret = fetch_writev(conn, &iov[1], 1); 711 else 712 ret = fetch_writev(conn, iov, 2); 713 if (ret == -1) 714 return (-1); 715 return (0); 716} 717 718 719/* 720 * Close connection 721 */ 722int 723fetch_close(conn_t *conn) 724{ 725 int ret; 726 727 if (--conn->ref > 0) 728 return (0); 729 ret = close(conn->sd); 730 free(conn->cache.buf); 731 free(conn->buf); 732 free(conn); 733 return (ret); 734} 735 736 737/*** Directory-related utility functions *************************************/ 738 739int 740fetch_add_entry(struct url_ent **p, int *size, int *len, 741 const char *name, struct url_stat *us) 742{ 743 struct url_ent *tmp; 744 745 if (*p == NULL) { 746 *size = 0; 747 *len = 0; 748 } 749 750 if (*len >= *size - 1) { 751 tmp = realloc(*p, (*size * 2 + 1) * sizeof(**p)); 752 if (tmp == NULL) { 753 errno = ENOMEM; 754 fetch_syserr(); 755 return (-1); 756 } 757 *size = (*size * 2 + 1); 758 *p = tmp; 759 } 760 761 tmp = *p + *len; 762 snprintf(tmp->name, PATH_MAX, "%s", name); 763 memcpy(&tmp->stat, us, sizeof(*us)); 764 765 (*len)++; 766 (++tmp)->name[0] = 0; 767 768 return (0); 769} 770 771 772/*** Authentication-related utility functions ********************************/ 773 774static const char * 775fetch_read_word(FILE *f) 776{ 777 static char word[1024]; 778 779 if (fscanf(f, " %1023s ", word) != 1) 780 return (NULL); 781 return (word); 782} 783 784/* 785 * Get authentication data for a URL from .netrc 786 */ 787int 788fetch_netrc_auth(struct url *url) 789{ 790 char fn[PATH_MAX]; 791 const char *word; 792 char *p; 793 FILE *f; 794 795 if ((p = getenv("NETRC")) != NULL) { 796 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 797 fetch_info("$NETRC specifies a file name " 798 "longer than PATH_MAX"); 799 return (-1); 800 } 801 } else { 802 if ((p = getenv("HOME")) != NULL) { 803 struct passwd *pwd; 804 805 if ((pwd = getpwuid(getuid())) == NULL || 806 (p = pwd->pw_dir) == NULL) 807 return (-1); 808 } 809 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 810 return (-1); 811 } 812 813 if ((f = fopen(fn, "r")) == NULL) 814 return (-1); 815 while ((word = fetch_read_word(f)) != NULL) { 816 if (strcmp(word, "default") == 0) { 817 DEBUG(fetch_info("Using default .netrc settings")); 818 break; 819 } 820 if (strcmp(word, "machine") == 0 && 821 (word = fetch_read_word(f)) != NULL && 822 strcasecmp(word, url->host) == 0) { 823 DEBUG(fetch_info("Using .netrc settings for %s", word)); 824 break; 825 } 826 } 827 if (word == NULL) 828 goto ferr; 829 while ((word = fetch_read_word(f)) != NULL) { 830 if (strcmp(word, "login") == 0) { 831 if ((word = fetch_read_word(f)) == NULL) 832 goto ferr; 833 if (snprintf(url->user, sizeof(url->user), 834 "%s", word) > (int)sizeof(url->user)) { 835 fetch_info("login name in .netrc is too long"); 836 url->user[0] = '\0'; 837 } 838 } else if (strcmp(word, "password") == 0) { 839 if ((word = fetch_read_word(f)) == NULL) 840 goto ferr; 841 if (snprintf(url->pwd, sizeof(url->pwd), 842 "%s", word) > (int)sizeof(url->pwd)) { 843 fetch_info("password in .netrc is too long"); 844 url->pwd[0] = '\0'; 845 } 846 } else if (strcmp(word, "account") == 0) { 847 if ((word = fetch_read_word(f)) == NULL) 848 goto ferr; 849 /* XXX not supported! */ 850 } else { 851 break; 852 } 853 } 854 fclose(f); 855 return (0); 856 ferr: 857 fclose(f); 858 return (-1); 859} 860 861/* 862 * The no_proxy environment variable specifies a set of domains for 863 * which the proxy should not be consulted; the contents is a comma-, 864 * or space-separated list of domain names. A single asterisk will 865 * override all proxy variables and no transactions will be proxied 866 * (for compatability with lynx and curl, see the discussion at 867 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 868 */ 869int 870fetch_no_proxy_match(const char *host) 871{ 872 const char *no_proxy, *p, *q; 873 size_t h_len, d_len; 874 875 if ((no_proxy = getenv("NO_PROXY")) == NULL && 876 (no_proxy = getenv("no_proxy")) == NULL) 877 return (0); 878 879 /* asterisk matches any hostname */ 880 if (strcmp(no_proxy, "*") == 0) 881 return (1); 882 883 h_len = strlen(host); 884 p = no_proxy; 885 do { 886 /* position p at the beginning of a domain suffix */ 887 while (*p == ',' || isspace((unsigned char)*p)) 888 p++; 889 890 /* position q at the first separator character */ 891 for (q = p; *q; ++q) 892 if (*q == ',' || isspace((unsigned char)*q)) 893 break; 894 895 d_len = q - p; 896 if (d_len > 0 && h_len >= d_len && 897 strncasecmp(host + h_len - d_len, 898 p, d_len) == 0) { 899 /* domain name matches */ 900 return (1); 901 } 902 903 p = q + 1; 904 } while (*q); 905 906 return (0); 907} 908