external/bsd/fetch/dist/libfetch/common.c

   1 /*      $NetBSD: common.c,v 1.2 2011/06/25 20:27:01 christos Exp $      */
   2 /*-
   3  * Copyright (c) 1998-2004 Dag-Erling Coïdan Smørgrav
   4  * Copyright (c) 2008, 2010 Joerg Sonnenberger <joerg@NetBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer
  12  *    in this position and unchanged.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. The name of the author may not be used to endorse or promote products
  17  *    derived from this software without specific prior written permission
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  * $FreeBSD: common.c,v 1.53 2007/12/19 00:26:36 des Exp $
  31  */
  32
  33 #if HAVE_CONFIG_H
  34 #include "config.h"
  35 #endif
  36 #ifndef NETBSD
  37 #include <nbcompat.h>
  38 #endif
  39
  40 #include <sys/types.h>
  41 #include <sys/socket.h>
  42 #include <sys/time.h>
  43 #include <sys/uio.h>
  44
  45 #include <netinet/in.h>
  46 #include <arpa/inet.h>
  47
  48 #include <ctype.h>
  49 #include <errno.h>
  50 #if defined(HAVE_INTTYPES_H) || defined(NETBSD)
  51 #include <inttypes.h>
  52 #endif
  53 #ifndef NETBSD
  54 #include <nbcompat/netdb.h>
  55 #else
  56 #include <netdb.h>
  57 #endif
  58 #include <pwd.h>
  59 #include <stdarg.h>
  60 #include <stdlib.h>
  61 #include <stdio.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64
  65 #ifndef MSG_NOSIGNAL
  66 #include <signal.h>
  67 #endif
  68
  69 #include "fetch.h"
  70 #include "common.h"
  71
  72 /*** Local data **************************************************************/
  73
  74 /*
  75  * Error messages for resolver errors
  76  */
  77 static struct fetcherr netdb_errlist[] = {
  78 #ifdef EAI_NODATA
  79         { EAI_NODATA,   FETCH_RESOLV,   "Host not found" },
  80 #endif
  81         { EAI_AGAIN,    FETCH_TEMP,     "Transient resolver failure" },
  82         { EAI_FAIL,     FETCH_RESOLV,   "Non-recoverable resolver failure" },
  83         { EAI_NONAME,   FETCH_RESOLV,   "No address record" },
  84         { -1,           FETCH_UNKNOWN,  "Unknown resolver error" }
  85 };
  86
  87 /*** Error-reporting functions ***********************************************/
  88
  89 /*
  90  * Map error code to string
  91  */
  92 static struct fetcherr *
  93 fetch_finderr(struct fetcherr *p, int e)
  94 {
  95         while (p->num != -1 && p->num != e)
  96                 p++;
  97         return (p);
  98 }
  99
 100 /*
 101  * Set error code
 102  */
 103 void
 104 fetch_seterr(struct fetcherr *p, int e)
 105 {
 106         p = fetch_finderr(p, e);
 107         fetchLastErrCode = p->cat;
 108         snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string);
 109 }
 110
 111 /*
 112  * Set error code according to errno
 113  */
 114 void
 115 fetch_syserr(void)
 116 {
 117         switch (errno) {
 118         case 0:
 119                 fetchLastErrCode = FETCH_OK;
 120                 break;
 121         case EPERM:
 122         case EACCES:
 123         case EROFS:
 124 #ifdef EAUTH
 125         case EAUTH:
 126 #endif
 127 #ifdef ENEEDAUTH
 128         case ENEEDAUTH:
 129 #endif
 130                 fetchLastErrCode = FETCH_AUTH;
 131                 break;
 132         case ENOENT:
 133         case EISDIR: /* XXX */
 134                 fetchLastErrCode = FETCH_UNAVAIL;
 135                 break;
 136         case ENOMEM:
 137                 fetchLastErrCode = FETCH_MEMORY;
 138                 break;
 139         case EBUSY:
 140         case EAGAIN:
 141                 fetchLastErrCode = FETCH_TEMP;
 142                 break;
 143         case EEXIST:
 144                 fetchLastErrCode = FETCH_EXISTS;
 145                 break;
 146         case ENOSPC:
 147                 fetchLastErrCode = FETCH_FULL;
 148                 break;
 149         case EADDRINUSE:
 150         case EADDRNOTAVAIL:
 151         case ENETDOWN:
 152         case ENETUNREACH:
 153         case ENETRESET:
 154         case EHOSTUNREACH:
 155                 fetchLastErrCode = FETCH_NETWORK;
 156                 break;
 157         case ECONNABORTED:
 158         case ECONNRESET:
 159                 fetchLastErrCode = FETCH_ABORT;
 160                 break;
 161         case ETIMEDOUT:
 162                 fetchLastErrCode = FETCH_TIMEOUT;
 163                 break;
 164         case ECONNREFUSED:
 165         case EHOSTDOWN:
 166                 fetchLastErrCode = FETCH_DOWN;
 167                 break;
 168 default:
 169                 fetchLastErrCode = FETCH_UNKNOWN;
 170         }
 171         snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno));
 172 }
 173
 174
 175 /*
 176  * Emit status message
 177  */
 178 void
 179 fetch_info(const char *fmt, ...)
 180 {
 181         va_list ap;
 182
 183         va_start(ap, fmt);
 184         vfprintf(stderr, fmt, ap);
 185         va_end(ap);
 186         fputc('\n', stderr);
 187 }
 188
 189
 190 /*** Network-related utility functions ***************************************/
 191
 192 /*
 193  * Return the default port for a scheme
 194  */
 195 int
 196 fetch_default_port(const char *scheme)
 197 {
 198         struct servent *se;
 199
 200         if ((se = getservbyname(scheme, "tcp")) != NULL)
 201                 return (ntohs(se->s_port));
 202         if (strcasecmp(scheme, SCHEME_FTP) == 0)
 203                 return (FTP_DEFAULT_PORT);
 204         if (strcasecmp(scheme, SCHEME_HTTP) == 0)
 205                 return (HTTP_DEFAULT_PORT);
 206         return (0);
 207 }
 208
 209 /*
 210  * Return the default proxy port for a scheme
 211  */
 212 int
 213 fetch_default_proxy_port(const char *scheme)
 214 {
 215         if (strcasecmp(scheme, SCHEME_FTP) == 0)
 216                 return (FTP_DEFAULT_PROXY_PORT);
 217         if (strcasecmp(scheme, SCHEME_HTTP) == 0)
 218                 return (HTTP_DEFAULT_PROXY_PORT);
 219         return (0);
 220 }
 221
 222
 223 /*
 224  * Create a connection for an existing descriptor.
 225  */
 226 conn_t *
 227 fetch_reopen(int sd)
 228 {
 229         conn_t *conn;
 230
 231         /* allocate and fill connection structure */
 232         if ((conn = calloc(1, sizeof(*conn))) == NULL)
 233                 return (NULL);
 234         conn->ftp_home = NULL;
 235         conn->cache_url = NULL;
 236         conn->next_buf = NULL;
 237         conn->next_len = 0;
 238         conn->sd = sd;
 239         return (conn);
 240 }
 241
 242
 243 /*
 244  * Bind a socket to a specific local address
 245  */
 246 int
 247 fetch_bind(int sd, int af, const char *addr)
 248 {
 249         struct addrinfo hints, *res, *res0;
 250
 251         memset(&hints, 0, sizeof(hints));
 252         hints.ai_family = af;
 253         hints.ai_socktype = SOCK_STREAM;
 254         hints.ai_protocol = 0;
 255         if (getaddrinfo(addr, NULL, &hints, &res0))
 256                 return (-1);
 257         for (res = res0; res; res = res->ai_next) {
 258                 if (bind(sd, res->ai_addr, res->ai_addrlen) == 0)
 259                         return (0);
 260         }
 261         return (-1);
 262 }
 263
 264
 265 /*
 266  * Establish a TCP connection to the specified port on the specified host.
 267  */
 268 conn_t *
 269 fetch_connect(struct url *url, int af, int verbose)
 270 {
 271         conn_t *conn;
 272         char pbuf[10];
 273         const char *bindaddr;
 274         struct addrinfo hints, *res, *res0;
 275         int sd, error;
 276
 277         if (verbose)
 278                 fetch_info("looking up %s", url->host);
 279
 280         /* look up host name and set up socket address structure */
 281         snprintf(pbuf, sizeof(pbuf), "%d", url->port);
 282         memset(&hints, 0, sizeof(hints));
 283         hints.ai_family = af;
 284         hints.ai_socktype = SOCK_STREAM;
 285         hints.ai_protocol = 0;
 286         if ((error = getaddrinfo(url->host, pbuf, &hints, &res0)) != 0) {
 287                 netdb_seterr(error);
 288                 return (NULL);
 289         }
 290         bindaddr = getenv("FETCH_BIND_ADDRESS");
 291
 292         if (verbose)
 293                 fetch_info("connecting to %s:%d", url->host, url->port);
 294
 295         /* try to connect */
 296         for (sd = -1, res = res0; res; sd = -1, res = res->ai_next) {
 297                 if ((sd = socket(res->ai_family, res->ai_socktype,
 298                          res->ai_protocol)) == -1)
 299                         continue;
 300                 if (bindaddr != NULL && *bindaddr != '\0' &&
 301                     fetch_bind(sd, res->ai_family, bindaddr) != 0) {
 302                         fetch_info("failed to bind to '%s'", bindaddr);
 303                         close(sd);
 304                         continue;
 305                 }
 306                 if (connect(sd, res->ai_addr, res->ai_addrlen) == 0)
 307                         break;
 308                 close(sd);
 309         }
 310         freeaddrinfo(res0);
 311         if (sd == -1) {
 312                 fetch_syserr();
 313                 return (NULL);
 314         }
 315
 316         if ((conn = fetch_reopen(sd)) == NULL) {
 317                 fetch_syserr();
 318                 close(sd);
 319         }
 320         conn->cache_url = fetchCopyURL(url);
 321         conn->cache_af = af;
 322         return (conn);
 323 }
 324
 325 static conn_t *connection_cache;
 326 static int cache_global_limit = 0;
 327 static int cache_per_host_limit = 0;
 328
 329 /*
 330  * Initialise cache with the given limits.
 331  */
 332 void
 333 fetchConnectionCacheInit(int global_limit, int per_host_limit)
 334 {
 335
 336         if (global_limit < 0)
 337                 cache_global_limit = INT_MAX;
 338         else if (per_host_limit > global_limit)
 339                 cache_global_limit = per_host_limit;
 340         else
 341                 cache_global_limit = global_limit;
 342         if (per_host_limit < 0)
 343                 cache_per_host_limit = INT_MAX;
 344         else
 345                 cache_per_host_limit = per_host_limit;
 346 }
 347
 348 /*
 349  * Flush cache and free all associated resources.
 350  */
 351 void
 352 fetchConnectionCacheClose(void)
 353 {
 354         conn_t *conn;
 355
 356         while ((conn = connection_cache) != NULL) {
 357                 connection_cache = conn->next_cached;
 358                 (*conn->cache_close)(conn);
 359         }
 360 }
 361
 362 /*
 363  * Check connection cache for an existing entry matching
 364  * protocol/host/port/user/password/family.
 365  */
 366 conn_t *
 367 fetch_cache_get(const struct url *url, int af)
 368 {
 369         conn_t *conn, *last_conn = NULL;
 370
 371         for (conn = connection_cache; conn; conn = conn->next_cached) {
 372                 if (conn->cache_url->port == url->port &&
 373                     strcmp(conn->cache_url->scheme, url->scheme) == 0 &&
 374                     strcmp(conn->cache_url->host, url->host) == 0 &&
 375                     strcmp(conn->cache_url->user, url->user) == 0 &&
 376                     strcmp(conn->cache_url->pwd, url->pwd) == 0 &&
 377                     (conn->cache_af == AF_UNSPEC || af == AF_UNSPEC ||
 378                      conn->cache_af == af)) {
 379                         if (last_conn != NULL)
 380                                 last_conn->next_cached = conn->next_cached;
 381                         else
 382                                 connection_cache = conn->next_cached;
 383                         return conn;
 384                 }
 385         }
 386
 387         return NULL;
 388 }
 389
 390 /*
 391  * Put the connection back into the cache for reuse.
 392  * If the connection is freed due to LRU or if the cache
 393  * is explicitly closed, the given callback is called.
 394  */
 395 void
 396 fetch_cache_put(conn_t *conn, int (*closecb)(conn_t *))
 397 {
 398         conn_t *iter, *last;
 399         int global_count, host_count;
 400
 401         if (conn->cache_url == NULL || cache_global_limit == 0) {
 402                 (*closecb)(conn);
 403                 return;
 404         }
 405
 406         global_count = host_count = 0;
 407         last = NULL;
 408         for (iter = connection_cache; iter;
 409             last = iter, iter = iter->next_cached) {
 410                 ++global_count;
 411                 if (strcmp(conn->cache_url->host, iter->cache_url->host) == 0)
 412                         ++host_count;
 413                 if (global_count < cache_global_limit &&
 414                     host_count < cache_per_host_limit)
 415                         continue;
 416                 --global_count;
 417                 if (last != NULL)
 418                         last->next_cached = iter->next_cached;
 419                 else
 420                         connection_cache = iter->next_cached;
 421                 (*iter->cache_close)(iter);
 422         }
 423
 424         conn->cache_close = closecb;
 425         conn->next_cached = connection_cache;
 426         connection_cache = conn;
 427 }
 428
 429 /*
 430  * Enable SSL on a connection.
 431  */
 432 int
 433 fetch_ssl(conn_t *conn, int verbose)
 434 {
 435
 436 #ifdef WITH_SSL
 437         /* Init the SSL library and context */
 438         if (!SSL_library_init()){
 439                 fprintf(stderr, "SSL library init failed\n");
 440                 return (-1);
 441         }
 442
 443         SSL_load_error_strings();
 444
 445         conn->ssl_meth = SSLv23_client_method();
 446         conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth);
 447         SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY);
 448
 449         conn->ssl = SSL_new(conn->ssl_ctx);
 450         if (conn->ssl == NULL){
 451                 fprintf(stderr, "SSL context creation failed\n");
 452                 return (-1);
 453         }
 454         SSL_set_fd(conn->ssl, conn->sd);
 455         if (SSL_connect(conn->ssl) == -1){
 456                 ERR_print_errors_fp(stderr);
 457                 return (-1);
 458         }
 459
 460         if (verbose) {
 461                 X509_NAME *name;
 462                 char *str;
 463
 464                 fprintf(stderr, "SSL connection established using %s\n",
 465                     SSL_get_cipher(conn->ssl));
 466                 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl);
 467                 name = X509_get_subject_name(conn->ssl_cert);
 468                 str = X509_NAME_oneline(name, 0, 0);
 469                 printf("Certificate subject: %s\n", str);
 470                 free(str);
 471                 name = X509_get_issuer_name(conn->ssl_cert);
 472                 str = X509_NAME_oneline(name, 0, 0);
 473                 printf("Certificate issuer: %s\n", str);
 474                 free(str);
 475         }
 476
 477         return (0);
 478 #else
 479         (void)conn;
 480         (void)verbose;
 481         fprintf(stderr, "SSL support disabled\n");
 482         return (-1);
 483 #endif
 484 }
 485
 486
 487 /*
 488  * Read a character from a connection w/ timeout
 489  */
 490 ssize_t
 491 fetch_read(conn_t *conn, char *buf, size_t len)
 492 {
 493         struct timeval now, timeout, waittv;
 494         fd_set readfds;
 495         ssize_t rlen;
 496         int r;
 497
 498         if (len == 0)
 499                 return 0;
 500
 501         if (conn->next_len != 0) {
 502                 if (conn->next_len < len)
 503                         len = conn->next_len;
 504                 memmove(buf, conn->next_buf, len);
 505                 conn->next_len -= len;
 506                 conn->next_buf += len;
 507                 return len;
 508         }
 509
 510         if (fetchTimeout) {
 511                 FD_ZERO(&readfds);
 512                 gettimeofday(&timeout, NULL);
 513                 timeout.tv_sec += fetchTimeout;
 514         }
 515
 516         for (;;) {
 517                 while (fetchTimeout && !FD_ISSET(conn->sd, &readfds)) {
 518                         FD_SET(conn->sd, &readfds);
 519                         gettimeofday(&now, NULL);
 520                         waittv.tv_sec = timeout.tv_sec - now.tv_sec;
 521                         waittv.tv_usec = timeout.tv_usec - now.tv_usec;
 522                         if (waittv.tv_usec < 0) {
 523                                 waittv.tv_usec += 1000000;
 524                                 waittv.tv_sec--;
 525                         }
 526                         if (waittv.tv_sec < 0) {
 527                                 errno = ETIMEDOUT;
 528                                 fetch_syserr();
 529                                 return (-1);
 530                         }
 531                         errno = 0;
 532                         r = select(conn->sd + 1, &readfds, NULL, NULL, &waittv);
 533                         if (r == -1) {
 534                                 if (errno == EINTR && fetchRestartCalls)
 535                                         continue;
 536                                 fetch_syserr();
 537                                 return (-1);
 538                         }
 539                 }
 540 #ifdef WITH_SSL
 541                 if (conn->ssl != NULL)
 542                         rlen = SSL_read(conn->ssl, buf, (int)len);
 543                 else
 544 #endif
 545                         rlen = read(conn->sd, buf, len);
 546                 if (rlen >= 0)
 547                         break;
 548
 549                 if (errno != EINTR || !fetchRestartCalls)
 550                         return (-1);
 551         }
 552         return (rlen);
 553 }
 554
 555
 556 /*
 557  * Read a line of text from a connection w/ timeout
 558  */
 559 #define MIN_BUF_SIZE 1024
 560
 561 int
 562 fetch_getln(conn_t *conn)
 563 {
 564         char *tmp, *next;
 565         size_t tmpsize;
 566         ssize_t len;
 567
 568         if (conn->buf == NULL) {
 569                 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) {
 570                         errno = ENOMEM;
 571                         return (-1);
 572                 }
 573                 conn->bufsize = MIN_BUF_SIZE;
 574         }
 575
 576         conn->buflen = 0;
 577         next = NULL;
 578
 579         do {
 580                 /*
 581                  * conn->bufsize != conn->buflen at this point,
 582                  * so the buffer can be NUL-terminated below for
 583                  * the case of len == 0.
 584                  */
 585                 len = fetch_read(conn, conn->buf + conn->buflen,
 586                     conn->bufsize - conn->buflen);
 587                 if (len == -1)
 588                         return (-1);
 589                 if (len == 0)
 590                         break;
 591                 next = memchr(conn->buf + conn->buflen, '\n', (size_t)len);
 592                 conn->buflen += len;
 593                 if (conn->buflen == conn->bufsize && next == NULL) {
 594                         tmp = conn->buf;
 595                         tmpsize = conn->bufsize * 2;
 596                         if (tmpsize < conn->bufsize) {
 597                                 errno = ENOMEM;
 598                                 return (-1);
 599                         }
 600                         if ((tmp = realloc(tmp, tmpsize)) == NULL) {
 601                                 errno = ENOMEM;
 602                                 return (-1);
 603                         }
 604                         conn->buf = tmp;
 605                         conn->bufsize = tmpsize;
 606                 }
 607         } while (next == NULL);
 608
 609         if (next != NULL) {
 610                 *next = '\0';
 611                 conn->next_buf = next + 1;
 612                 conn->next_len = conn->buflen - (conn->next_buf - conn->buf);
 613                 conn->buflen = next - conn->buf;
 614         } else {
 615                 conn->buf[conn->buflen] = '\0';
 616                 conn->next_len = 0;
 617         }
 618         return (0);
 619 }
 620
 621 /*
 622  * Write a vector to a connection w/ timeout
 623  * Note: can modify the iovec.
 624  */
 625 ssize_t
 626 fetch_write(conn_t *conn, const void *buf, size_t len)
 627 {
 628         struct timeval now, timeout, waittv;
 629         fd_set writefds;
 630         ssize_t wlen, total;
 631         int r;
 632 #ifndef MSG_NOSIGNAL
 633         static int killed_sigpipe;
 634 #endif
 635
 636 #ifndef MSG_NOSIGNAL
 637         if (!killed_sigpipe) {
 638                 signal(SIGPIPE, SIG_IGN);
 639                 killed_sigpipe = 1;
 640         }
 641 #endif
 642
 643
 644         if (fetchTimeout) {
 645                 FD_ZERO(&writefds);
 646                 gettimeofday(&timeout, NULL);
 647                 timeout.tv_sec += fetchTimeout;
 648         }
 649
 650         total = 0;
 651         while (len) {
 652                 while (fetchTimeout && !FD_ISSET(conn->sd, &writefds)) {
 653                         FD_SET(conn->sd, &writefds);
 654                         gettimeofday(&now, NULL);
 655                         waittv.tv_sec = timeout.tv_sec - now.tv_sec;
 656                         waittv.tv_usec = timeout.tv_usec - now.tv_usec;
 657                         if (waittv.tv_usec < 0) {
 658                                 waittv.tv_usec += 1000000;
 659                                 waittv.tv_sec--;
 660                         }
 661                         if (waittv.tv_sec < 0) {
 662                                 errno = ETIMEDOUT;
 663                                 fetch_syserr();
 664                                 return (-1);
 665                         }
 666                         errno = 0;
 667                         r = select(conn->sd + 1, NULL, &writefds, NULL, &waittv);
 668                         if (r == -1) {
 669                                 if (errno == EINTR && fetchRestartCalls)
 670                                         continue;
 671                                 return (-1);
 672                         }
 673                 }
 674                 errno = 0;
 675 #ifdef WITH_SSL
 676                 if (conn->ssl != NULL)
 677                         wlen = SSL_write(conn->ssl, buf, (int)len);
 678                 else
 679 #endif
 680 #ifndef MSG_NOSIGNAL
 681                         wlen = send(conn->sd, buf, len, 0);
 682 #else
 683                         wlen = send(conn->sd, buf, len, MSG_NOSIGNAL);
 684 #endif
 685                 if (wlen == 0) {
 686                         /* we consider a short write a failure */
 687                         errno = EPIPE;
 688                         fetch_syserr();
 689                         return (-1);
 690                 }
 691                 if (wlen < 0) {
 692                         if (errno == EINTR && fetchRestartCalls)
 693                                 continue;
 694                         return (-1);
 695                 }
 696                 total += wlen;
 697                 buf = (const char *)buf + wlen;
 698                 len -= wlen;
 699         }
 700         return (total);
 701 }
 702
 703
 704 /*
 705  * Close connection
 706  */
 707 int
 708 fetch_close(conn_t *conn)
 709 {
 710         int ret;
 711
 712         ret = close(conn->sd);
 713         if (conn->cache_url)
 714                 fetchFreeURL(conn->cache_url);
 715         free(conn->ftp_home);
 716         free(conn->buf);
 717         free(conn);
 718         return (ret);
 719 }
 720
 721
 722 /*** Directory-related utility functions *************************************/
 723
 724 int
 725 fetch_add_entry(struct url_list *ue, struct url *base, const char *name,
 726     int pre_quoted)
 727 {
 728         struct url *tmp;
 729         char *tmp_name;
 730         size_t base_doc_len, name_len, i;
 731         unsigned char c;
 732
 733         if (strchr(name, '/') != NULL ||
 734             strcmp(name, "..") == 0 ||
 735             strcmp(name, ".") == 0)
 736                 return 0;
 737
 738         if (strcmp(base->doc, "/") == 0)
 739                 base_doc_len = 0;
 740         else
 741                 base_doc_len = strlen(base->doc);
 742
 743         name_len = 1;
 744         for (i = 0; name[i] != '\0'; ++i) {
 745                 if ((!pre_quoted && name[i] == '%') ||
 746                     !fetch_urlpath_safe(name[i]))
 747                         name_len += 3;
 748                 else
 749                         ++name_len;
 750         }
 751
 752         tmp_name = malloc( base_doc_len + name_len + 1);
 753         if (tmp_name == NULL) {
 754                 errno = ENOMEM;
 755                 fetch_syserr();
 756                 return (-1);
 757         }
 758
 759         if (ue->length + 1 >= ue->alloc_size) {
 760                 tmp = realloc(ue->urls, (ue->alloc_size * 2 + 1) * sizeof(*tmp));
 761                 if (tmp == NULL) {
 762                         free(tmp_name);
 763                         errno = ENOMEM;
 764                         fetch_syserr();
 765                         return (-1);
 766                 }
 767                 ue->alloc_size = ue->alloc_size * 2 + 1;
 768                 ue->urls = tmp;
 769         }
 770
 771         tmp = ue->urls + ue->length;
 772         strcpy(tmp->scheme, base->scheme);
 773         strcpy(tmp->user, base->user);
 774         strcpy(tmp->pwd, base->pwd);
 775         strcpy(tmp->host, base->host);
 776         tmp->port = base->port;
 777         tmp->doc = tmp_name;
 778         memcpy(tmp->doc, base->doc, base_doc_len);
 779         tmp->doc[base_doc_len] = '/';
 780
 781         for (i = base_doc_len + 1; *name != '\0'; ++name) {
 782                 if ((!pre_quoted && *name == '%') ||
 783                     !fetch_urlpath_safe(*name)) {
 784                         tmp->doc[i++] = '%';
 785                         c = (unsigned char)*name / 16;
 786                         if (c < 10)
 787                                 tmp->doc[i++] = '0' + c;
 788                         else
 789                                 tmp->doc[i++] = 'a' - 10 + c;
 790                         c = (unsigned char)*name % 16;
 791                         if (c < 10)
 792                                 tmp->doc[i++] = '0' + c;
 793                         else
 794                                 tmp->doc[i++] = 'a' - 10 + c;
 795                 } else {
 796                         tmp->doc[i++] = *name;
 797                 }
 798         }
 799         tmp->doc[i] = '\0';
 800
 801         tmp->offset = 0;
 802         tmp->length = 0;
 803         tmp->last_modified = -1;
 804
 805         ++ue->length;
 806
 807         return (0);
 808 }
 809
 810 void
 811 fetchInitURLList(struct url_list *ue)
 812 {
 813         ue->length = ue->alloc_size = 0;
 814         ue->urls = NULL;
 815 }
 816
 817 int
 818 fetchAppendURLList(struct url_list *dst, const struct url_list *src)
 819 {
 820         size_t i, j, len;
 821
 822         len = dst->length + src->length;
 823         if (len > dst->alloc_size) {
 824                 struct url *tmp;
 825
 826                 tmp = realloc(dst->urls, len * sizeof(*tmp));
 827                 if (tmp == NULL) {
 828                         errno = ENOMEM;
 829                         fetch_syserr();
 830                         return (-1);
 831                 }
 832                 dst->alloc_size = len;
 833                 dst->urls = tmp;
 834         }
 835
 836         for (i = 0, j = dst->length; i < src->length; ++i, ++j) {
 837                 dst->urls[j] = src->urls[i];
 838                 dst->urls[j].doc = strdup(src->urls[i].doc);
 839                 if (dst->urls[j].doc == NULL) {
 840                         while (i-- > 0)
 841                                 free(dst->urls[j].doc);
 842                         fetch_syserr();
 843                         return -1;
 844                 }
 845         }
 846         dst->length = len;
 847
 848         return 0;
 849 }
 850
 851 void
 852 fetchFreeURLList(struct url_list *ue)
 853 {
 854         size_t i;
 855
 856         for (i = 0; i < ue->length; ++i)
 857                 free(ue->urls[i].doc);
 858         free(ue->urls);
 859         ue->length = ue->alloc_size = 0;
 860 }
 861
 862
 863 /*** Authentication-related utility functions ********************************/
 864
 865 static const char *
 866 fetch_read_word(FILE *f)
 867 {
 868         static char word[1024];
 869
 870         if (fscanf(f, " %1023s ", word) != 1)
 871                 return (NULL);
 872         return (word);
 873 }
 874
 875 /*
 876  * Get authentication data for a URL from .netrc
 877  */
 878 int
 879 fetch_netrc_auth(struct url *url)
 880 {
 881         char fn[PATH_MAX];
 882         const char *word;
 883         char *p;
 884         FILE *f;
 885
 886         if ((p = getenv("NETRC")) != NULL) {
 887                 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) {
 888                         fetch_info("$NETRC specifies a file name "
 889                             "longer than PATH_MAX");
 890                         return (-1);
 891                 }
 892         } else {
 893                 if ((p = getenv("HOME")) != NULL) {
 894                         struct passwd *pwd;
 895
 896                         if ((pwd = getpwuid(getuid())) == NULL ||
 897                             (p = pwd->pw_dir) == NULL)
 898                                 return (-1);
 899                 }
 900                 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn))
 901                         return (-1);
 902         }
 903
 904         if ((f = fopen(fn, "r")) == NULL)
 905                 return (-1);
 906         while ((word = fetch_read_word(f)) != NULL) {
 907                 if (strcmp(word, "default") == 0)
 908                         break;
 909                 if (strcmp(word, "machine") == 0 &&
 910                     (word = fetch_read_word(f)) != NULL &&
 911                     strcasecmp(word, url->host) == 0) {
 912                         break;
 913                 }
 914         }
 915         if (word == NULL)
 916                 goto ferr;
 917         while ((word = fetch_read_word(f)) != NULL) {
 918                 if (strcmp(word, "login") == 0) {
 919                         if ((word = fetch_read_word(f)) == NULL)
 920                                 goto ferr;
 921                         if (snprintf(url->user, sizeof(url->user),
 922                                 "%s", word) > (int)sizeof(url->user)) {
 923                                 fetch_info("login name in .netrc is too long");
 924                                 url->user[0] = '\0';
 925                         }
 926                 } else if (strcmp(word, "password") == 0) {
 927                         if ((word = fetch_read_word(f)) == NULL)
 928                                 goto ferr;
 929                         if (snprintf(url->pwd, sizeof(url->pwd),
 930                                 "%s", word) > (int)sizeof(url->pwd)) {
 931                                 fetch_info("password in .netrc is too long");
 932                                 url->pwd[0] = '\0';
 933                         }
 934                 } else if (strcmp(word, "account") == 0) {
 935                         if ((word = fetch_read_word(f)) == NULL)
 936                                 goto ferr;
 937                         /* XXX not supported! */
 938                 } else {
 939                         break;
 940                 }
 941         }
 942         fclose(f);
 943         return (0);
 944  ferr:
 945         fclose(f);
 946         return (-1);
 947 }
 948
 949 /*
 950  * The no_proxy environment variable specifies a set of domains for
 951  * which the proxy should not be consulted; the contents is a comma-,
 952  * or space-separated list of domain names.  A single asterisk will
 953  * override all proxy variables and no transactions will be proxied
 954  * (for compatability with lynx and curl, see the discussion at
 955  * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>).
 956  */
 957 int
 958 fetch_no_proxy_match(const char *host)
 959 {
 960         const char *no_proxy, *p, *q;
 961         size_t h_len, d_len;
 962
 963         if ((no_proxy = getenv("NO_PROXY")) == NULL &&
 964             (no_proxy = getenv("no_proxy")) == NULL)
 965                 return (0);
 966
 967         /* asterisk matches any hostname */
 968         if (strcmp(no_proxy, "*") == 0)
 969                 return (1);
 970
 971         h_len = strlen(host);
 972         p = no_proxy;
 973         do {
 974                 /* position p at the beginning of a domain suffix */
 975                 while (*p == ',' || isspace((unsigned char)*p))
 976                         p++;
 977
 978                 /* position q at the first separator character */
 979                 for (q = p; *q; ++q)
 980                         if (*q == ',' || isspace((unsigned char)*q))
 981                                 break;
 982
 983                 d_len = q - p;
 984                 if (d_len > 0 && h_len > d_len &&
 985                     strncasecmp(host + h_len - d_len,
 986                         p, d_len) == 0) {
 987                         /* domain name matches */
 988                         return (1);
 989                 }
 990
 991                 p = q + 1;
 992         } while (*q);
 993
 994         return (0);
 995 }
 996
 997 struct fetchIO {
 998         void *io_cookie;
 999         ssize_t (*io_read)(void *, void *, size_t);
1000         ssize_t (*io_write)(void *, const void *, size_t);
1001         void (*io_close)(void *);
1002 };
1003
1004 void
1005 fetchIO_close(fetchIO *f)
1006 {
1007         if (f->io_close != NULL)
1008                 (*f->io_close)(f->io_cookie);
1009
1010         free(f);
1011 }
1012
1013 fetchIO *
1014 fetchIO_unopen(void *io_cookie, ssize_t (*io_read)(void *, void *, size_t),
1015     ssize_t (*io_write)(void *, const void *, size_t),
1016     void (*io_close)(void *))
1017 {
1018         fetchIO *f;
1019
1020         f = malloc(sizeof(*f));
1021         if (f == NULL)
1022                 return f;
1023
1024         f->io_cookie = io_cookie;
1025         f->io_read = io_read;
1026         f->io_write = io_write;
1027         f->io_close = io_close;
1028
1029         return f;
1030 }
1031
1032 ssize_t
1033 fetchIO_read(fetchIO *f, void *buf, size_t len)
1034 {
1035         if (f->io_read == NULL)
1036                 return EBADF;
1037         return (*f->io_read)(f->io_cookie, buf, len);
1038 }
1039
1040 ssize_t
1041 fetchIO_write(fetchIO *f, const void *buf, size_t len)
1042 {
1043         if (f->io_read == NULL)
1044                 return EBADF;
1045         return (*f->io_write)(f->io_cookie, buf, len);
1046 }