1 /*- 2 * Copyright (c) 1998 Dag-Erling Co�dan Sm�rgrav 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/socket.h> 34 #include <sys/time.h> 35 #include <sys/uio.h> 36 #include <netinet/in.h> 37 38 #include <errno.h> 39 #include <netdb.h> 40 #include <stdarg.h> 41 #include <stdlib.h> 42 #include <stdio.h> 43 #include <string.h> 44 #include <unistd.h> 45 46 #include "fetch.h" 47 #include "common.h" 48 49 50 /*** Local data **************************************************************/ 51 52 /* 53 * Error messages for resolver errors 54 */ 55 static struct fetcherr _netdb_errlist[] = { 56 { EAI_NODATA, FETCH_RESOLV, "Host not found" }, 57 { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, 58 { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, 59 { EAI_NONAME, FETCH_RESOLV, "No address record" }, 60 { -1, FETCH_UNKNOWN, "Unknown resolver error" } 61 }; 62 63 /* End-of-Line */ 64 static const char ENDL[2] = "\r\n"; 65 66 67 /*** Error-reporting functions ***********************************************/ 68 69 /* 70 * Map error code to string 71 */ 72 static struct fetcherr * 73 _fetch_finderr(struct fetcherr *p, int e) 74 { 75 while (p->num != -1 && p->num != e) 76 p++; 77 return (p); 78 } 79 80 /* 81 * Set error code 82 */ 83 void 84 _fetch_seterr(struct fetcherr *p, int e) 85 { 86 p = _fetch_finderr(p, e); 87 fetchLastErrCode = p->cat; 88 snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string); 89 } 90 91 /* 92 * Set error code according to errno 93 */ 94 void 95 _fetch_syserr(void) 96 { 97 switch (errno) { 98 case 0: 99 fetchLastErrCode = FETCH_OK; 100 break; 101 case EPERM: 102 case EACCES: 103 case EROFS: 104 case EAUTH: 105 case ENEEDAUTH: 106 fetchLastErrCode = FETCH_AUTH; 107 break; 108 case ENOENT: 109 case EISDIR: /* XXX */ 110 fetchLastErrCode = FETCH_UNAVAIL; 111 break; 112 case ENOMEM: 113 fetchLastErrCode = FETCH_MEMORY; 114 break; 115 case EBUSY: 116 case EAGAIN: 117 fetchLastErrCode = FETCH_TEMP; 118 break; 119 case EEXIST: 120 fetchLastErrCode = FETCH_EXISTS; 121 break; 122 case ENOSPC: 123 fetchLastErrCode = FETCH_FULL; 124 break; 125 case EADDRINUSE: 126 case EADDRNOTAVAIL: 127 case ENETDOWN: 128 case ENETUNREACH: 129 case ENETRESET: 130 case EHOSTUNREACH: 131 fetchLastErrCode = FETCH_NETWORK; 132 break; 133 case ECONNABORTED: 134 case ECONNRESET: 135 fetchLastErrCode = FETCH_ABORT; 136 break; 137 case ETIMEDOUT: 138 fetchLastErrCode = FETCH_TIMEOUT; 139 break; 140 case ECONNREFUSED: 141 case EHOSTDOWN: 142 fetchLastErrCode = FETCH_DOWN; 143 break; 144 default: 145 fetchLastErrCode = FETCH_UNKNOWN; 146 } 147 snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno)); 148 } 149 150 151 /* 152 * Emit status message 153 */ 154 void 155 _fetch_info(const char *fmt, ...) 156 { 157 va_list ap; 158 159 va_start(ap, fmt); 160 vfprintf(stderr, fmt, ap); 161 va_end(ap); 162 fputc('\n', stderr); 163 } 164 165 166 /*** Network-related utility functions ***************************************/ 167 168 /* 169 * Return the default port for a scheme 170 */ 171 int 172 _fetch_default_port(const char *scheme) 173 { 174 struct servent *se; 175 176 if ((se = getservbyname(scheme, "tcp")) != NULL) 177 return (ntohs(se->s_port)); 178 if (strcasecmp(scheme, SCHEME_FTP) == 0) 179 return (FTP_DEFAULT_PORT); 180 if (strcasecmp(scheme, SCHEME_HTTP) == 0) 181 return (HTTP_DEFAULT_PORT); 182 return (0); 183 } 184 185 /* 186 * Return the default proxy port for a scheme 187 */ 188 int 189 _fetch_default_proxy_port(const char *scheme) 190 { 191 if (strcasecmp(scheme, SCHEME_FTP) == 0) 192 return (FTP_DEFAULT_PROXY_PORT); 193 if (strcasecmp(scheme, SCHEME_HTTP) == 0) 194 return (HTTP_DEFAULT_PROXY_PORT); 195 return (0); 196 } 197 198 199 /* 200 * Create a connection for an existing descriptor. 201 */ 202 conn_t * 203 _fetch_reopen(int sd) 204 { 205 conn_t *conn; 206 207 /* allocate and fill connection structure */ 208 if ((conn = calloc(1, sizeof *conn)) == NULL) 209 return (NULL); 210 conn->sd = sd; 211 ++conn->ref; 212 return (conn); 213 } 214 215 216 /* 217 * Bump a connection's reference count. 218 */ 219 conn_t * 220 _fetch_ref(conn_t *conn) 221 { 222 223 ++conn->ref; 224 return (conn); 225 } 226 227 228 /* 229 * Establish a TCP connection to the specified port on the specified host. 230 */ 231 conn_t * 232 _fetch_connect(const char *host, int port, int af, int verbose) 233 { 234 conn_t *conn; 235 char pbuf[10]; 236 struct addrinfo hints, *res, *res0; 237 int sd, err; 238 239 DEBUG(fprintf(stderr, "---> %s:%d\n", host, port)); 240 241 if (verbose) 242 _fetch_info("looking up %s", host); 243 244 /* look up host name and set up socket address structure */ 245 snprintf(pbuf, sizeof(pbuf), "%d", port); 246 memset(&hints, 0, sizeof(hints)); 247 hints.ai_family = af; 248 hints.ai_socktype = SOCK_STREAM; 249 hints.ai_protocol = 0; 250 if ((err = getaddrinfo(host, pbuf, &hints, &res0)) != 0) { 251 _netdb_seterr(err); 252 return (NULL); 253 } 254 255 if (verbose) 256 _fetch_info("connecting to %s:%d", host, port); 257 258 /* try to connect */ 259 for (sd = -1, res = res0; res; res = res->ai_next) { 260 if ((sd = socket(res->ai_family, res->ai_socktype, 261 res->ai_protocol)) == -1) 262 continue; 263 if (connect(sd, res->ai_addr, res->ai_addrlen) != -1) 264 break; 265 close(sd); 266 sd = -1; 267 } 268 freeaddrinfo(res0); 269 if (sd == -1) { 270 _fetch_syserr(); 271 return (NULL); 272 } 273 274 if ((conn = _fetch_reopen(sd)) == NULL) { 275 _fetch_syserr(); 276 close(sd); 277 } 278 return (conn); 279 } 280 281 282 /* 283 * Enable SSL on a connection. 284 */ 285 int 286 _fetch_ssl(conn_t *conn, int verbose) 287 { 288 289 #ifdef WITH_SSL 290 /* Init the SSL library and context */ 291 if (!SSL_library_init()){ 292 fprintf(stderr, "SSL library init failed\n"); 293 return (-1); 294 } 295 296 SSL_load_error_strings(); 297 298 conn->ssl_meth = SSLv23_client_method(); 299 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); 300 301 conn->ssl = SSL_new(conn->ssl_ctx); 302 if (conn->ssl == NULL){ 303 fprintf(stderr, "SSL context creation failed\n"); 304 return (-1); 305 } 306 SSL_set_fd(conn->ssl, conn->sd); 307 if (SSL_connect(conn->ssl) == -1){ 308 ERR_print_errors_fp(stderr); 309 return (-1); 310 } 311 312 if (verbose) { 313 X509_NAME *name; 314 char *str; 315 316 fprintf(stderr, "SSL connection established using %s\n", 317 SSL_get_cipher(conn->ssl)); 318 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 319 name = X509_get_subject_name(conn->ssl_cert); 320 str = X509_NAME_oneline(name, 0, 0); 321 printf("Certificate subject: %s\n", str); 322 free(str); 323 name = X509_get_issuer_name(conn->ssl_cert); 324 str = X509_NAME_oneline(name, 0, 0); 325 printf("Certificate issuer: %s\n", str); 326 free(str); 327 } 328 329 return (0); 330 #else 331 (void)conn; 332 (void)verbose; 333 fprintf(stderr, "SSL support disabled\n"); 334 return (-1); 335 #endif 336 } 337 338 339 /* 340 * Read a character from a connection w/ timeout 341 */ 342 ssize_t 343 _fetch_read(conn_t *conn, char *buf, size_t len) 344 { 345 struct timeval now, timeout, wait; 346 fd_set readfds; 347 ssize_t rlen, total; 348 int r; 349 350 rlen = 0; 351 352 if (fetchTimeout) { 353 FD_ZERO(&readfds); 354 gettimeofday(&timeout, NULL); 355 timeout.tv_sec += fetchTimeout; 356 } 357 358 total = 0; 359 while (len > 0) { 360 while (fetchTimeout && !FD_ISSET(conn->sd, &readfds)) { 361 FD_SET(conn->sd, &readfds); 362 gettimeofday(&now, NULL); 363 wait.tv_sec = timeout.tv_sec - now.tv_sec; 364 wait.tv_usec = timeout.tv_usec - now.tv_usec; 365 if (wait.tv_usec < 0) { 366 wait.tv_usec += 1000000; 367 wait.tv_sec--; 368 } 369 if (wait.tv_sec < 0) 370 return (rlen); 371 errno = 0; 372 r = select(conn->sd + 1, &readfds, NULL, NULL, &wait); 373 if (r == -1) { 374 if (errno == EINTR && fetchRestartCalls) 375 continue; 376 return (-1); 377 } 378 } 379 #ifdef WITH_SSL 380 if (conn->ssl != NULL) 381 rlen = SSL_read(conn->ssl, buf, len); 382 else 383 #endif 384 rlen = read(conn->sd, buf, len); 385 if (rlen == 0) 386 break; 387 if (rlen < 0) { 388 if (errno == EINTR && fetchRestartCalls) 389 continue; 390 return (-1); 391 } 392 len -= rlen; 393 buf += rlen; 394 total += rlen; 395 } 396 return (total); 397 } 398 399 400 /* 401 * Read a line of text from a connection w/ timeout 402 */ 403 #define MIN_BUF_SIZE 1024 404 405 int 406 _fetch_getln(conn_t *conn) 407 { 408 char *tmp; 409 size_t tmpsize; 410 char c; 411 int error; 412 413 if (conn->buf == NULL) { 414 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 415 errno = ENOMEM; 416 return (-1); 417 } 418 conn->bufsize = MIN_BUF_SIZE; 419 } 420 421 conn->buf[0] = '\0'; 422 conn->buflen = 0; 423 424 do { 425 error = _fetch_read(conn, &c, 1); 426 if (error == -1) 427 return (-1); 428 else if (error == 0) 429 break; 430 conn->buf[conn->buflen++] = c; 431 if (conn->buflen == conn->bufsize) { 432 tmp = conn->buf; 433 tmpsize = conn->bufsize * 2 + 1; 434 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 435 errno = ENOMEM; 436 return (-1); 437 } 438 conn->buf = tmp; 439 conn->bufsize = tmpsize; 440 } 441 } while (c != '\n'); 442 443 conn->buf[conn->buflen] = '\0'; 444 DEBUG(fprintf(stderr, "<<< %s", conn->buf)); 445 return (0); 446 } 447 448 449 /* 450 * Write to a connection w/ timeout 451 */ 452 ssize_t 453 _fetch_write(conn_t *conn, const char *buf, size_t len) 454 { 455 struct timeval now, timeout, wait; 456 fd_set writefds; 457 ssize_t wlen, total; 458 int r; 459 460 total = 0; 461 462 if (fetchTimeout) { 463 FD_ZERO(&writefds); 464 gettimeofday(&timeout, NULL); 465 timeout.tv_sec += fetchTimeout; 466 } 467 468 while (len > 0) { 469 while (fetchTimeout && !FD_ISSET(conn->sd, &writefds)) { 470 FD_SET(conn->sd, &writefds); 471 gettimeofday(&now, NULL); 472 wait.tv_sec = timeout.tv_sec - now.tv_sec; 473 wait.tv_usec = timeout.tv_usec - now.tv_usec; 474 if (wait.tv_usec < 0) { 475 wait.tv_usec += 1000000; 476 wait.tv_sec--; 477 } 478 if (wait.tv_sec < 0) { 479 errno = ETIMEDOUT; 480 return (-1); 481 } 482 errno = 0; 483 r = select(conn->sd + 1, NULL, &writefds, NULL, &wait); 484 if (r == -1) { 485 if (errno == EINTR && fetchRestartCalls) 486 continue; 487 return (-1); 488 } 489 } 490 errno = 0; 491 #ifdef WITH_SSL 492 if (conn->ssl != NULL) 493 wlen = SSL_write(conn->ssl, buf, len); 494 else 495 #endif 496 wlen = write(conn->sd, buf, len); 497 if (wlen == 0) 498 /* we consider a short write a failure */ 499 return (-1); 500 if (wlen < 0) { 501 if (errno == EINTR && fetchRestartCalls) 502 continue; 503 return (-1); 504 } 505 len -= wlen; 506 buf += wlen; 507 total += wlen; 508 } 509 return (total); 510 } 511 512 513 /* 514 * Write a line of text to a connection w/ timeout 515 */ 516 int 517 _fetch_putln(conn_t *conn, const char *str, size_t len) 518 { 519 520 DEBUG(fprintf(stderr, ">>> %s\n", str)); 521 if (_fetch_write(conn, str, len) == -1 || 522 _fetch_write(conn, ENDL, sizeof ENDL) == -1) 523 return (-1); 524 return (0); 525 } 526 527 528 /* 529 * Close connection 530 */ 531 int 532 _fetch_close(conn_t *conn) 533 { 534 int ret; 535 536 if (--conn->ref > 0) 537 return (0); 538 ret = close(conn->sd); 539 free(conn); 540 return (ret); 541 } 542 543 544 /*** Directory-related utility functions *************************************/ 545 546 int 547 _fetch_add_entry(struct url_ent **p, int *size, int *len, 548 const char *name, struct url_stat *us) 549 { 550 struct url_ent *tmp; 551 552 if (*p == NULL) { 553 *size = 0; 554 *len = 0; 555 } 556 557 if (*len >= *size - 1) { 558 tmp = realloc(*p, (*size * 2 + 1) * sizeof **p); 559 if (tmp == NULL) { 560 errno = ENOMEM; 561 _fetch_syserr(); 562 return (-1); 563 } 564 *size = (*size * 2 + 1); 565 *p = tmp; 566 } 567 568 tmp = *p + *len; 569 snprintf(tmp->name, PATH_MAX, "%s", name); 570 bcopy(us, &tmp->stat, sizeof *us); 571 572 (*len)++; 573 (++tmp)->name[0] = 0; 574 575 return (0); 576 } 577