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 * $FreeBSD: src/lib/libfetch/fetch.c,v 1.10.2.14 2003/06/06 06:45:25 des Exp $ 29 * $DragonFly: src/lib/libfetch/fetch.c,v 1.2 2003/06/17 04:26:49 dillon Exp $ 30 */ 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 int direct; 78 79 direct = CHECK_FLAG('d'); 80 if (us != NULL) { 81 us->size = -1; 82 us->atime = us->mtime = 0; 83 } 84 if (strcasecmp(URL->scheme, SCHEME_FILE) == 0) 85 return (fetchXGetFile(URL, us, flags)); 86 else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) 87 return (fetchXGetFTP(URL, us, flags)); 88 else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) 89 return (fetchXGetHTTP(URL, us, flags)); 90 else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0) 91 return (fetchXGetHTTP(URL, us, flags)); 92 _url_seterr(URL_BAD_SCHEME); 93 return (NULL); 94 } 95 96 /* 97 * Select the appropriate protocol for the URL scheme, and return a 98 * read-only stream connected to the document referenced by the URL. 99 */ 100 FILE * 101 fetchGet(struct url *URL, const char *flags) 102 { 103 return (fetchXGet(URL, NULL, flags)); 104 } 105 106 /* 107 * Select the appropriate protocol for the URL scheme, and return a 108 * write-only stream connected to the document referenced by the URL. 109 */ 110 FILE * 111 fetchPut(struct url *URL, const char *flags) 112 { 113 int direct; 114 115 direct = CHECK_FLAG('d'); 116 if (strcasecmp(URL->scheme, SCHEME_FILE) == 0) 117 return (fetchPutFile(URL, flags)); 118 else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) 119 return (fetchPutFTP(URL, flags)); 120 else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) 121 return (fetchPutHTTP(URL, flags)); 122 else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0) 123 return (fetchPutHTTP(URL, flags)); 124 _url_seterr(URL_BAD_SCHEME); 125 return (NULL); 126 } 127 128 /* 129 * Select the appropriate protocol for the URL scheme, and return the 130 * size of the document referenced by the URL if it exists. 131 */ 132 int 133 fetchStat(struct url *URL, struct url_stat *us, const char *flags) 134 { 135 int direct; 136 137 direct = CHECK_FLAG('d'); 138 if (us != NULL) { 139 us->size = -1; 140 us->atime = us->mtime = 0; 141 } 142 if (strcasecmp(URL->scheme, SCHEME_FILE) == 0) 143 return (fetchStatFile(URL, us, flags)); 144 else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) 145 return (fetchStatFTP(URL, us, flags)); 146 else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) 147 return (fetchStatHTTP(URL, us, flags)); 148 else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0) 149 return (fetchStatHTTP(URL, us, flags)); 150 _url_seterr(URL_BAD_SCHEME); 151 return (-1); 152 } 153 154 /* 155 * Select the appropriate protocol for the URL scheme, and return a 156 * list of files in the directory pointed to by the URL. 157 */ 158 struct url_ent * 159 fetchList(struct url *URL, const char *flags) 160 { 161 int direct; 162 163 direct = CHECK_FLAG('d'); 164 if (strcasecmp(URL->scheme, SCHEME_FILE) == 0) 165 return (fetchListFile(URL, flags)); 166 else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) 167 return (fetchListFTP(URL, flags)); 168 else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) 169 return (fetchListHTTP(URL, flags)); 170 else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0) 171 return (fetchListHTTP(URL, flags)); 172 _url_seterr(URL_BAD_SCHEME); 173 return (NULL); 174 } 175 176 /* 177 * Attempt to parse the given URL; if successful, call fetchXGet(). 178 */ 179 FILE * 180 fetchXGetURL(const char *URL, struct url_stat *us, const char *flags) 181 { 182 struct url *u; 183 FILE *f; 184 185 if ((u = fetchParseURL(URL)) == NULL) 186 return (NULL); 187 188 f = fetchXGet(u, us, flags); 189 190 fetchFreeURL(u); 191 return (f); 192 } 193 194 /* 195 * Attempt to parse the given URL; if successful, call fetchGet(). 196 */ 197 FILE * 198 fetchGetURL(const char *URL, const char *flags) 199 { 200 return (fetchXGetURL(URL, NULL, flags)); 201 } 202 203 /* 204 * Attempt to parse the given URL; if successful, call fetchPut(). 205 */ 206 FILE * 207 fetchPutURL(const char *URL, const char *flags) 208 { 209 struct url *u; 210 FILE *f; 211 212 if ((u = fetchParseURL(URL)) == NULL) 213 return (NULL); 214 215 f = fetchPut(u, flags); 216 217 fetchFreeURL(u); 218 return (f); 219 } 220 221 /* 222 * Attempt to parse the given URL; if successful, call fetchStat(). 223 */ 224 int 225 fetchStatURL(const char *URL, struct url_stat *us, const char *flags) 226 { 227 struct url *u; 228 int s; 229 230 if ((u = fetchParseURL(URL)) == NULL) 231 return (-1); 232 233 s = fetchStat(u, us, flags); 234 235 fetchFreeURL(u); 236 return (s); 237 } 238 239 /* 240 * Attempt to parse the given URL; if successful, call fetchList(). 241 */ 242 struct url_ent * 243 fetchListURL(const char *URL, const char *flags) 244 { 245 struct url *u; 246 struct url_ent *ue; 247 248 if ((u = fetchParseURL(URL)) == NULL) 249 return (NULL); 250 251 ue = fetchList(u, flags); 252 253 fetchFreeURL(u); 254 return (ue); 255 } 256 257 /* 258 * Make a URL 259 */ 260 struct url * 261 fetchMakeURL(const char *scheme, const char *host, int port, const char *doc, 262 const char *user, const char *pwd) 263 { 264 struct url *u; 265 266 if (!scheme || (!host && !doc)) { 267 _url_seterr(URL_MALFORMED); 268 return (NULL); 269 } 270 271 if (port < 0 || port > 65535) { 272 _url_seterr(URL_BAD_PORT); 273 return (NULL); 274 } 275 276 /* allocate struct url */ 277 if ((u = calloc(1, sizeof(*u))) == NULL) { 278 _fetch_syserr(); 279 return (NULL); 280 } 281 282 if ((u->doc = strdup(doc ? doc : "/")) == NULL) { 283 _fetch_syserr(); 284 free(u); 285 return (NULL); 286 } 287 288 #define seturl(x) snprintf(u->x, sizeof(u->x), "%s", x) 289 seturl(scheme); 290 seturl(host); 291 seturl(user); 292 seturl(pwd); 293 #undef seturl 294 u->port = port; 295 296 return (u); 297 } 298 299 /* 300 * Split an URL into components. URL syntax is: 301 * [method:/][/[user[:pwd]@]host[:port]/][document] 302 * This almost, but not quite, RFC1738 URL syntax. 303 */ 304 struct url * 305 fetchParseURL(const char *URL) 306 { 307 char *doc; 308 const char *p, *q; 309 struct url *u; 310 int i; 311 312 /* allocate struct url */ 313 if ((u = calloc(1, sizeof(*u))) == NULL) { 314 _fetch_syserr(); 315 return (NULL); 316 } 317 318 /* scheme name */ 319 if ((p = strstr(URL, ":/"))) { 320 snprintf(u->scheme, URL_SCHEMELEN+1, 321 "%.*s", (int)(p - URL), URL); 322 URL = ++p; 323 /* 324 * Only one slash: no host, leave slash as part of document 325 * Two slashes: host follows, strip slashes 326 */ 327 if (URL[1] == '/') 328 URL = (p += 2); 329 } else { 330 p = URL; 331 } 332 if (!*URL || *URL == '/' || *URL == '.' || 333 (u->scheme[0] == '\0' && 334 strchr(URL, '/') == NULL && strchr(URL, ':') == NULL)) 335 goto nohost; 336 337 p = strpbrk(URL, "/@"); 338 if (p && *p == '@') { 339 /* username */ 340 for (q = URL, i = 0; (*q != ':') && (*q != '@'); q++) 341 if (i < URL_USERLEN) 342 u->user[i++] = *q; 343 344 /* password */ 345 if (*q == ':') 346 for (q++, i = 0; (*q != ':') && (*q != '@'); q++) 347 if (i < URL_PWDLEN) 348 u->pwd[i++] = *q; 349 350 p++; 351 } else { 352 p = URL; 353 } 354 355 /* hostname */ 356 #ifdef INET6 357 if (*p == '[' && (q = strchr(p + 1, ']')) != NULL && 358 (*++q == '\0' || *q == '/' || *q == ':')) { 359 if ((i = q - p - 2) > MAXHOSTNAMELEN) 360 i = MAXHOSTNAMELEN; 361 strncpy(u->host, ++p, i); 362 p = q; 363 } else 364 #endif 365 for (i = 0; *p && (*p != '/') && (*p != ':'); p++) 366 if (i < MAXHOSTNAMELEN) 367 u->host[i++] = *p; 368 369 /* port */ 370 if (*p == ':') { 371 for (q = ++p; *q && (*q != '/'); q++) 372 if (isdigit(*q)) 373 u->port = u->port * 10 + (*q - '0'); 374 else { 375 /* invalid port */ 376 _url_seterr(URL_BAD_PORT); 377 goto ouch; 378 } 379 p = q; 380 } 381 382 nohost: 383 /* document */ 384 if (!*p) 385 p = "/"; 386 387 if (strcasecmp(u->scheme, SCHEME_HTTP) == 0 || 388 strcasecmp(u->scheme, SCHEME_HTTPS) == 0) { 389 const char hexnums[] = "0123456789abcdef"; 390 391 /* percent-escape whitespace. */ 392 if ((doc = malloc(strlen(p) * 3 + 1)) == NULL) { 393 _fetch_syserr(); 394 goto ouch; 395 } 396 u->doc = doc; 397 while (*p != '\0') { 398 if (!isspace(*p)) { 399 *doc++ = *p++; 400 } else { 401 *doc++ = '%'; 402 *doc++ = hexnums[((unsigned int)*p) >> 4]; 403 *doc++ = hexnums[((unsigned int)*p) & 0xf]; 404 p++; 405 } 406 } 407 *doc = '\0'; 408 } else if ((u->doc = strdup(p)) == NULL) { 409 _fetch_syserr(); 410 goto ouch; 411 } 412 413 DEBUG(fprintf(stderr, 414 "scheme: [%s]\n" 415 "user: [%s]\n" 416 "password: [%s]\n" 417 "host: [%s]\n" 418 "port: [%d]\n" 419 "document: [%s]\n", 420 u->scheme, u->user, u->pwd, 421 u->host, u->port, u->doc)); 422 423 return (u); 424 425 ouch: 426 free(u); 427 return (NULL); 428 } 429 430 /* 431 * Free a URL 432 */ 433 void 434 fetchFreeURL(struct url *u) 435 { 436 free(u->doc); 437 free(u); 438 } 439