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/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 (strcasecmp(URL->scheme, SCHEME_FILE) == 0) 81 return fetchXGetFile(URL, us, flags); 82 else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) 83 return fetchXGetHTTP(URL, us, flags); 84 else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 85 return fetchXGetFTP(URL, us, flags); 86 } else { 87 _url_seterr(URL_BAD_SCHEME); 88 return NULL; 89 } 90 } 91 92 /* 93 * Select the appropriate protocol for the URL scheme, and return a 94 * read-only stream connected to the document referenced by the URL. 95 */ 96 FILE * 97 fetchGet(struct url *URL, const char *flags) 98 { 99 return fetchXGet(URL, NULL, flags); 100 } 101 102 /* 103 * Select the appropriate protocol for the URL scheme, and return a 104 * write-only stream connected to the document referenced by the URL. 105 */ 106 FILE * 107 fetchPut(struct url *URL, const char *flags) 108 { 109 int direct; 110 111 direct = CHECK_FLAG('d'); 112 if (strcasecmp(URL->scheme, SCHEME_FILE) == 0) 113 return fetchPutFile(URL, flags); 114 else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) 115 return fetchPutHTTP(URL, flags); 116 else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 117 return fetchPutFTP(URL, flags); 118 } else { 119 _url_seterr(URL_BAD_SCHEME); 120 return NULL; 121 } 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 int direct; 132 133 direct = CHECK_FLAG('d'); 134 if (strcasecmp(URL->scheme, SCHEME_FILE) == 0) 135 return fetchStatFile(URL, us, flags); 136 else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) 137 return fetchStatHTTP(URL, us, flags); 138 else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 139 return fetchStatFTP(URL, us, flags); 140 } else { 141 _url_seterr(URL_BAD_SCHEME); 142 return -1; 143 } 144 } 145 146 /* 147 * Select the appropriate protocol for the URL scheme, and return a 148 * list of files in the directory pointed to by the URL. 149 */ 150 struct url_ent * 151 fetchList(struct url *URL, const char *flags) 152 { 153 int direct; 154 155 direct = CHECK_FLAG('d'); 156 if (strcasecmp(URL->scheme, SCHEME_FILE) == 0) 157 return fetchListFile(URL, flags); 158 else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) 159 return fetchListHTTP(URL, flags); 160 else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 161 return fetchListFTP(URL, flags); 162 } else { 163 _url_seterr(URL_BAD_SCHEME); 164 return NULL; 165 } 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 * Split an URL into components. URL syntax is: 293 * [method:/][/[user[:pwd]@]host[:port]/][document] 294 * This almost, but not quite, RFC1738 URL syntax. 295 */ 296 struct url * 297 fetchParseURL(const char *URL) 298 { 299 char *doc; 300 const char *p, *q; 301 struct url *u; 302 int i; 303 304 /* allocate struct url */ 305 if ((u = calloc(1, sizeof *u)) == NULL) { 306 _fetch_syserr(); 307 return NULL; 308 } 309 310 /* scheme name */ 311 if ((p = strstr(URL, ":/"))) { 312 snprintf(u->scheme, URL_SCHEMELEN+1, "%.*s", (int)(p - URL), URL); 313 URL = ++p; 314 /* 315 * Only one slash: no host, leave slash as part of document 316 * Two slashes: host follows, strip slashes 317 */ 318 if (URL[1] == '/') 319 URL = (p += 2); 320 } else { 321 p = URL; 322 } 323 if (!*URL || *URL == '/' || *URL == '.' || 324 (u->scheme[0] == '\0' && 325 strchr(URL, '/') == NULL && strchr(URL, ':') == NULL)) 326 goto nohost; 327 328 p = strpbrk(URL, "/@"); 329 if (p && *p == '@') { 330 /* username */ 331 for (q = URL, i = 0; (*q != ':') && (*q != '@'); q++) 332 if (i < URL_USERLEN) 333 u->user[i++] = *q; 334 335 /* password */ 336 if (*q == ':') 337 for (q++, i = 0; (*q != ':') && (*q != '@'); q++) 338 if (i < URL_PWDLEN) 339 u->pwd[i++] = *q; 340 341 p++; 342 } else { 343 p = URL; 344 } 345 346 /* hostname */ 347 #ifdef INET6 348 if (*p == '[' && (q = strchr(p + 1, ']')) != NULL && 349 (*++q == '\0' || *q == '/' || *q == ':')) { 350 if ((i = q - p - 2) > MAXHOSTNAMELEN) 351 i = MAXHOSTNAMELEN; 352 strncpy(u->host, ++p, i); 353 p = q; 354 } else 355 #endif 356 for (i = 0; *p && (*p != '/') && (*p != ':'); p++) 357 if (i < MAXHOSTNAMELEN) 358 u->host[i++] = *p; 359 360 /* port */ 361 if (*p == ':') { 362 for (q = ++p; *q && (*q != '/'); q++) 363 if (isdigit(*q)) 364 u->port = u->port * 10 + (*q - '0'); 365 else { 366 /* invalid port */ 367 _url_seterr(URL_BAD_PORT); 368 goto ouch; 369 } 370 while (*p && (*p != '/')) 371 p++; 372 } 373 374 nohost: 375 /* document */ 376 if (!*p) 377 p = "/"; 378 379 if (strcasecmp(u->scheme, SCHEME_HTTP) == 0 || 380 strcasecmp(u->scheme, SCHEME_HTTPS) == 0) { 381 const char hexnums[] = "0123456789abcdef"; 382 383 /* percent-escape whitespace. */ 384 if ((doc = malloc(strlen(p) * 3 + 1)) == NULL) { 385 _fetch_syserr(); 386 goto ouch; 387 } 388 u->doc = doc; 389 while (*p != '\0') { 390 if (!isspace(*p)) { 391 *doc++ = *p++; 392 } else { 393 *doc++ = '%'; 394 *doc++ = hexnums[((unsigned int)*p) >> 4]; 395 *doc++ = hexnums[((unsigned int)*p) & 0xf]; 396 p++; 397 } 398 } 399 *doc = '\0'; 400 } else if ((u->doc = strdup(p)) == NULL) { 401 _fetch_syserr(); 402 goto ouch; 403 } 404 405 DEBUG(fprintf(stderr, 406 "scheme: [\033[1m%s\033[m]\n" 407 "user: [\033[1m%s\033[m]\n" 408 "password: [\033[1m%s\033[m]\n" 409 "host: [\033[1m%s\033[m]\n" 410 "port: [\033[1m%d\033[m]\n" 411 "document: [\033[1m%s\033[m]\n", 412 u->scheme, u->user, u->pwd, 413 u->host, u->port, u->doc)); 414 415 return u; 416 417 ouch: 418 free(u); 419 return NULL; 420 } 421 422 /* 423 * Free a URL 424 */ 425 void 426 fetchFreeURL(struct url *u) 427 { 428 free(u->doc); 429 free(u); 430 } 431