1 /*- 2 * Copyright (c) 1998-2004 Dag-Erling Smørgrav 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/errno.h> 34 35 #include <ctype.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 40 #include "fetch.h" 41 #include "common.h" 42 43 auth_t fetchAuthMethod; 44 int fetchLastErrCode; 45 char fetchLastErrString[MAXERRSTRING]; 46 int fetchTimeout; 47 int fetchRestartCalls = 1; 48 int fetchDebug; 49 50 51 /*** Local data **************************************************************/ 52 53 /* 54 * Error messages for parser errors 55 */ 56 #define URL_MALFORMED 1 57 #define URL_BAD_SCHEME 2 58 #define URL_BAD_PORT 3 59 static struct fetcherr url_errlist[] = { 60 { URL_MALFORMED, FETCH_URL, "Malformed URL" }, 61 { URL_BAD_SCHEME, FETCH_URL, "Invalid URL scheme" }, 62 { URL_BAD_PORT, FETCH_URL, "Invalid server port" }, 63 { -1, FETCH_UNKNOWN, "Unknown parser error" } 64 }; 65 66 67 /*** Public API **************************************************************/ 68 69 /* 70 * Select the appropriate protocol for the URL scheme, and return a 71 * read-only stream connected to the document referenced by the URL. 72 * Also fill out the struct url_stat. 73 */ 74 FILE * 75 fetchXGet(struct url *URL, struct url_stat *us, const char *flags) 76 { 77 78 if (us != NULL) { 79 us->size = -1; 80 us->atime = us->mtime = 0; 81 } 82 if (strcasecmp(URL->scheme, SCHEME_FILE) == 0) 83 return (fetchXGetFile(URL, us, flags)); 84 else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) 85 return (fetchXGetFTP(URL, us, flags)); 86 else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) 87 return (fetchXGetHTTP(URL, us, flags)); 88 else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0) 89 return (fetchXGetHTTP(URL, us, flags)); 90 url_seterr(URL_BAD_SCHEME); 91 return (NULL); 92 } 93 94 /* 95 * Select the appropriate protocol for the URL scheme, and return a 96 * read-only stream connected to the document referenced by the URL. 97 */ 98 FILE * 99 fetchGet(struct url *URL, const char *flags) 100 { 101 return (fetchXGet(URL, NULL, flags)); 102 } 103 104 /* 105 * Select the appropriate protocol for the URL scheme, and return a 106 * write-only stream connected to the document referenced by the URL. 107 */ 108 FILE * 109 fetchPut(struct url *URL, const char *flags) 110 { 111 112 if (strcasecmp(URL->scheme, SCHEME_FILE) == 0) 113 return (fetchPutFile(URL, flags)); 114 else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) 115 return (fetchPutFTP(URL, flags)); 116 else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) 117 return (fetchPutHTTP(URL, flags)); 118 else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0) 119 return (fetchPutHTTP(URL, flags)); 120 url_seterr(URL_BAD_SCHEME); 121 return (NULL); 122 } 123 124 /* 125 * Select the appropriate protocol for the URL scheme, and return the 126 * size of the document referenced by the URL if it exists. 127 */ 128 int 129 fetchStat(struct url *URL, struct url_stat *us, const char *flags) 130 { 131 132 if (us != NULL) { 133 us->size = -1; 134 us->atime = us->mtime = 0; 135 } 136 if (strcasecmp(URL->scheme, SCHEME_FILE) == 0) 137 return (fetchStatFile(URL, us, flags)); 138 else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) 139 return (fetchStatFTP(URL, us, flags)); 140 else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) 141 return (fetchStatHTTP(URL, us, flags)); 142 else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0) 143 return (fetchStatHTTP(URL, us, flags)); 144 url_seterr(URL_BAD_SCHEME); 145 return (-1); 146 } 147 148 /* 149 * Select the appropriate protocol for the URL scheme, and return a 150 * list of files in the directory pointed to by the URL. 151 */ 152 struct url_ent * 153 fetchList(struct url *URL, const char *flags) 154 { 155 156 if (strcasecmp(URL->scheme, SCHEME_FILE) == 0) 157 return (fetchListFile(URL, flags)); 158 else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) 159 return (fetchListFTP(URL, flags)); 160 else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) 161 return (fetchListHTTP(URL, flags)); 162 else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0) 163 return (fetchListHTTP(URL, flags)); 164 url_seterr(URL_BAD_SCHEME); 165 return (NULL); 166 } 167 168 /* 169 * Attempt to parse the given URL; if successful, call fetchXGet(). 170 */ 171 FILE * 172 fetchXGetURL(const char *URL, struct url_stat *us, const char *flags) 173 { 174 struct url *u; 175 FILE *f; 176 177 if ((u = fetchParseURL(URL)) == NULL) 178 return (NULL); 179 180 f = fetchXGet(u, us, flags); 181 182 fetchFreeURL(u); 183 return (f); 184 } 185 186 /* 187 * Attempt to parse the given URL; if successful, call fetchGet(). 188 */ 189 FILE * 190 fetchGetURL(const char *URL, const char *flags) 191 { 192 return (fetchXGetURL(URL, NULL, flags)); 193 } 194 195 /* 196 * Attempt to parse the given URL; if successful, call fetchPut(). 197 */ 198 FILE * 199 fetchPutURL(const char *URL, const char *flags) 200 { 201 struct url *u; 202 FILE *f; 203 204 if ((u = fetchParseURL(URL)) == NULL) 205 return (NULL); 206 207 f = fetchPut(u, flags); 208 209 fetchFreeURL(u); 210 return (f); 211 } 212 213 /* 214 * Attempt to parse the given URL; if successful, call fetchStat(). 215 */ 216 int 217 fetchStatURL(const char *URL, struct url_stat *us, const char *flags) 218 { 219 struct url *u; 220 int s; 221 222 if ((u = fetchParseURL(URL)) == NULL) 223 return (-1); 224 225 s = fetchStat(u, us, flags); 226 227 fetchFreeURL(u); 228 return (s); 229 } 230 231 /* 232 * Attempt to parse the given URL; if successful, call fetchList(). 233 */ 234 struct url_ent * 235 fetchListURL(const char *URL, const char *flags) 236 { 237 struct url *u; 238 struct url_ent *ue; 239 240 if ((u = fetchParseURL(URL)) == NULL) 241 return (NULL); 242 243 ue = fetchList(u, flags); 244 245 fetchFreeURL(u); 246 return (ue); 247 } 248 249 /* 250 * Make a URL 251 */ 252 struct url * 253 fetchMakeURL(const char *scheme, const char *host, int port, const char *doc, 254 const char *user, const char *pwd) 255 { 256 struct url *u; 257 258 if (!scheme || (!host && !doc)) { 259 url_seterr(URL_MALFORMED); 260 return (NULL); 261 } 262 263 if (port < 0 || port > 65535) { 264 url_seterr(URL_BAD_PORT); 265 return (NULL); 266 } 267 268 /* allocate struct url */ 269 if ((u = calloc(1, sizeof(*u))) == NULL) { 270 fetch_syserr(); 271 return (NULL); 272 } 273 274 if ((u->doc = strdup(doc ? doc : "/")) == NULL) { 275 fetch_syserr(); 276 free(u); 277 return (NULL); 278 } 279 280 #define seturl(x) snprintf(u->x, sizeof(u->x), "%s", x) 281 seturl(scheme); 282 seturl(host); 283 seturl(user); 284 seturl(pwd); 285 #undef seturl 286 u->port = port; 287 288 return (u); 289 } 290 291 /* 292 * Return value of the given hex digit. 293 */ 294 static int 295 fetch_hexval(char ch) 296 { 297 298 if (ch >= '0' && ch <= '9') 299 return (ch - '0'); 300 else if (ch >= 'a' && ch <= 'f') 301 return (ch - 'a' + 10); 302 else if (ch >= 'A' && ch <= 'F') 303 return (ch - 'A' + 10); 304 return (-1); 305 } 306 307 /* 308 * Decode percent-encoded URL component from src into dst, stopping at end 309 * of string, or at @ or : separators. Returns a pointer to the unhandled 310 * part of the input string (null terminator, @, or :). No terminator is 311 * written to dst (it is the caller's responsibility). 312 */ 313 static const char * 314 fetch_pctdecode(char *dst, const char *src, size_t dlen) 315 { 316 int d1, d2; 317 char c; 318 const char *s; 319 320 for (s = src; *s != '\0' && *s != '@' && *s != ':'; s++) { 321 if (s[0] == '%' && (d1 = fetch_hexval(s[1])) >= 0 && 322 (d2 = fetch_hexval(s[2])) >= 0 && (d1 > 0 || d2 > 0)) { 323 c = d1 << 4 | d2; 324 s += 2; 325 } else { 326 c = *s; 327 } 328 if (dlen-- > 0) 329 *dst++ = c; 330 } 331 return (s); 332 } 333 334 /* 335 * Split an URL into components. URL syntax is: 336 * [method:/][/[user[:pwd]@]host[:port]/][document] 337 * This almost, but not quite, RFC1738 URL syntax. 338 */ 339 struct url * 340 fetchParseURL(const char *URL) 341 { 342 char *doc; 343 const char *p, *q; 344 struct url *u; 345 int i; 346 347 /* allocate struct url */ 348 if ((u = calloc(1, sizeof(*u))) == NULL) { 349 fetch_syserr(); 350 return (NULL); 351 } 352 353 /* scheme name */ 354 if ((p = strstr(URL, ":/"))) { 355 snprintf(u->scheme, URL_SCHEMELEN+1, 356 "%.*s", (int)(p - URL), URL); 357 URL = ++p; 358 /* 359 * Only one slash: no host, leave slash as part of document 360 * Two slashes: host follows, strip slashes 361 */ 362 if (URL[1] == '/') 363 URL = (p += 2); 364 } else { 365 p = URL; 366 } 367 if (!*URL || *URL == '/' || *URL == '.' || 368 (u->scheme[0] == '\0' && 369 strchr(URL, '/') == NULL && strchr(URL, ':') == NULL)) 370 goto nohost; 371 372 p = strpbrk(URL, "/@"); 373 if (p && *p == '@') { 374 /* username */ 375 q = fetch_pctdecode(u->user, URL, URL_USERLEN); 376 377 /* password */ 378 if (*q == ':') 379 q = fetch_pctdecode(u->pwd, q + 1, URL_PWDLEN); 380 381 p++; 382 } else { 383 p = URL; 384 } 385 386 /* hostname */ 387 #ifdef INET6 388 if (*p == '[' && (q = strchr(p + 1, ']')) != NULL && 389 (*++q == '\0' || *q == '/' || *q == ':')) { 390 if ((i = q - p - 2) > MAXHOSTNAMELEN) 391 i = MAXHOSTNAMELEN; 392 strncpy(u->host, ++p, i); 393 p = q; 394 } else 395 #endif 396 for (i = 0; *p && (*p != '/') && (*p != ':'); p++) 397 if (i < MAXHOSTNAMELEN) 398 u->host[i++] = *p; 399 400 /* port */ 401 if (*p == ':') { 402 for (q = ++p; *q && (*q != '/'); q++) 403 if (isdigit((unsigned char)*q)) 404 u->port = u->port * 10 + (*q - '0'); 405 else { 406 /* invalid port */ 407 url_seterr(URL_BAD_PORT); 408 goto ouch; 409 } 410 p = q; 411 } 412 413 nohost: 414 /* document */ 415 if (!*p) 416 p = "/"; 417 418 if (strcasecmp(u->scheme, SCHEME_HTTP) == 0 || 419 strcasecmp(u->scheme, SCHEME_HTTPS) == 0) { 420 const char hexnums[] = "0123456789abcdef"; 421 422 /* percent-escape whitespace. */ 423 if ((doc = malloc(strlen(p) * 3 + 1)) == NULL) { 424 fetch_syserr(); 425 goto ouch; 426 } 427 u->doc = doc; 428 while (*p != '\0') { 429 if (!isspace((unsigned char)*p)) { 430 *doc++ = *p++; 431 } else { 432 *doc++ = '%'; 433 *doc++ = hexnums[((unsigned int)*p) >> 4]; 434 *doc++ = hexnums[((unsigned int)*p) & 0xf]; 435 p++; 436 } 437 } 438 *doc = '\0'; 439 } else if ((u->doc = strdup(p)) == NULL) { 440 fetch_syserr(); 441 goto ouch; 442 } 443 444 DEBUG(fprintf(stderr, 445 "scheme: [%s]\n" 446 "user: [%s]\n" 447 "password: [%s]\n" 448 "host: [%s]\n" 449 "port: [%d]\n" 450 "document: [%s]\n", 451 u->scheme, u->user, u->pwd, 452 u->host, u->port, u->doc)); 453 454 return (u); 455 456 ouch: 457 free(u); 458 return (NULL); 459 } 460 461 /* 462 * Free a URL 463 */ 464 void 465 fetchFreeURL(struct url *u) 466 { 467 free(u->doc); 468 free(u); 469 } 470