http.c revision 225814
1275970Scy/*- 2275970Scy * Copyright (c) 2000-2011 Dag-Erling Sm�rgrav 3275970Scy * All rights reserved. 4275970Scy * 5275970Scy * Redistribution and use in source and binary forms, with or without 6275970Scy * modification, are permitted provided that the following conditions 7275970Scy * are met: 8275970Scy * 1. Redistributions of source code must retain the above copyright 9275970Scy * notice, this list of conditions and the following disclaimer 10275970Scy * in this position and unchanged. 11275970Scy * 2. Redistributions in binary form must reproduce the above copyright 12275970Scy * notice, this list of conditions and the following disclaimer in the 13275970Scy * documentation and/or other materials provided with the distribution. 14275970Scy * 3. The name of the author may not be used to endorse or promote products 15275970Scy * derived from this software without specific prior written permission. 16275970Scy * 17275970Scy * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18275970Scy * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19275970Scy * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20275970Scy * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21275970Scy * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22275970Scy * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23275970Scy * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24275970Scy * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25275970Scy * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26275970Scy * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27275970Scy */ 28275970Scy 29275970Scy#include <sys/cdefs.h> 30275970Scy__FBSDID("$FreeBSD: head/lib/libfetch/http.c 225814 2011-09-27 18:57:26Z des $"); 31275970Scy 32275970Scy/* 33275970Scy * The following copyright applies to the base64 code: 34275970Scy * 35275970Scy *- 36275970Scy * Copyright 1997 Massachusetts Institute of Technology 37275970Scy * 38275970Scy * Permission to use, copy, modify, and distribute this software and 39275970Scy * its documentation for any purpose and without fee is hereby 40275970Scy * granted, provided that both the above copyright notice and this 41275970Scy * permission notice appear in all copies, that both the above 42275970Scy * copyright notice and this permission notice appear in all 43275970Scy * supporting documentation, and that the name of M.I.T. not be used 44275970Scy * in advertising or publicity pertaining to distribution of the 45275970Scy * software without specific, written prior permission. M.I.T. makes 46275970Scy * no representations about the suitability of this software for any 47275970Scy * purpose. It is provided "as is" without express or implied 48275970Scy * warranty. 49275970Scy * 50275970Scy * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 51275970Scy * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 52275970Scy * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 53275970Scy * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 54275970Scy * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 55275970Scy * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 56275970Scy * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 57275970Scy * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 58275970Scy * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 59275970Scy * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 60275970Scy * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61275970Scy * SUCH DAMAGE. 62275970Scy */ 63275970Scy 64275970Scy#include <sys/param.h> 65275970Scy#include <sys/socket.h> 66275970Scy#include <sys/time.h> 67275970Scy 68275970Scy#include <ctype.h> 69275970Scy#include <err.h> 70275970Scy#include <errno.h> 71275970Scy#include <locale.h> 72275970Scy#include <netdb.h> 73275970Scy#include <stdarg.h> 74275970Scy#include <stdio.h> 75275970Scy#include <stdlib.h> 76275970Scy#include <string.h> 77275970Scy#include <time.h> 78275970Scy#include <unistd.h> 79275970Scy#include <md5.h> 80275970Scy 81275970Scy#include <netinet/in.h> 82275970Scy#include <netinet/tcp.h> 83275970Scy 84275970Scy#include "fetch.h" 85275970Scy#include "common.h" 86275970Scy#include "httperr.h" 87275970Scy 88275970Scy/* Maximum number of redirects to follow */ 89275970Scy#define MAX_REDIRECT 5 90275970Scy 91275970Scy/* Symbolic names for reply codes we care about */ 92275970Scy#define HTTP_OK 200 93275970Scy#define HTTP_PARTIAL 206 94275970Scy#define HTTP_MOVED_PERM 301 95275970Scy#define HTTP_MOVED_TEMP 302 96275970Scy#define HTTP_SEE_OTHER 303 97275970Scy#define HTTP_NOT_MODIFIED 304 98275970Scy#define HTTP_TEMP_REDIRECT 307 99275970Scy#define HTTP_NEED_AUTH 401 100275970Scy#define HTTP_NEED_PROXY_AUTH 407 101275970Scy#define HTTP_BAD_RANGE 416 102275970Scy#define HTTP_PROTOCOL_ERROR 999 103275970Scy 104275970Scy#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ 105275970Scy || (xyz) == HTTP_MOVED_TEMP \ 106275970Scy || (xyz) == HTTP_TEMP_REDIRECT \ 107275970Scy || (xyz) == HTTP_SEE_OTHER) 108275970Scy 109275970Scy#define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599) 110275970Scy 111275970Scy 112275970Scy/***************************************************************************** 113275970Scy * I/O functions for decoding chunked streams 114275970Scy */ 115275970Scy 116275970Scystruct httpio 117275970Scy{ 118275970Scy conn_t *conn; /* connection */ 119275970Scy int chunked; /* chunked mode */ 120275970Scy char *buf; /* chunk buffer */ 121275970Scy size_t bufsize; /* size of chunk buffer */ 122275970Scy ssize_t buflen; /* amount of data currently in buffer */ 123275970Scy int bufpos; /* current read offset in buffer */ 124275970Scy int eof; /* end-of-file flag */ 125275970Scy int error; /* error flag */ 126275970Scy size_t chunksize; /* remaining size of current chunk */ 127275970Scy#ifndef NDEBUG 128275970Scy size_t total; 129275970Scy#endif 130275970Scy}; 131275970Scy 132275970Scy/* 133275970Scy * Get next chunk header 134275970Scy */ 135275970Scystatic int 136275970Scyhttp_new_chunk(struct httpio *io) 137275970Scy{ 138275970Scy char *p; 139275970Scy 140275970Scy if (fetch_getln(io->conn) == -1) 141275970Scy return (-1); 142275970Scy 143275970Scy if (io->conn->buflen < 2 || !isxdigit((unsigned char)*io->conn->buf)) 144275970Scy return (-1); 145275970Scy 146275970Scy for (p = io->conn->buf; *p && !isspace((unsigned char)*p); ++p) { 147275970Scy if (*p == ';') 148275970Scy break; 149275970Scy if (!isxdigit((unsigned char)*p)) 150275970Scy return (-1); 151275970Scy if (isdigit((unsigned char)*p)) { 152275970Scy io->chunksize = io->chunksize * 16 + 153275970Scy *p - '0'; 154275970Scy } else { 155275970Scy io->chunksize = io->chunksize * 16 + 156275970Scy 10 + tolower((unsigned char)*p) - 'a'; 157275970Scy } 158275970Scy } 159275970Scy 160275970Scy#ifndef NDEBUG 161275970Scy if (fetchDebug) { 162275970Scy io->total += io->chunksize; 163275970Scy if (io->chunksize == 0) 164275970Scy fprintf(stderr, "%s(): end of last chunk\n", __func__); 165275970Scy else 166275970Scy fprintf(stderr, "%s(): new chunk: %lu (%lu)\n", 167275970Scy __func__, (unsigned long)io->chunksize, 168275970Scy (unsigned long)io->total); 169275970Scy } 170275970Scy#endif 171275970Scy 172275970Scy return (io->chunksize); 173275970Scy} 174275970Scy 175275970Scy/* 176275970Scy * Grow the input buffer to at least len bytes 177275970Scy */ 178275970Scystatic inline int 179275970Scyhttp_growbuf(struct httpio *io, size_t len) 180275970Scy{ 181275970Scy char *tmp; 182275970Scy 183275970Scy if (io->bufsize >= len) 184275970Scy return (0); 185275970Scy 186275970Scy if ((tmp = realloc(io->buf, len)) == NULL) 187275970Scy return (-1); 188275970Scy io->buf = tmp; 189275970Scy io->bufsize = len; 190275970Scy return (0); 191275970Scy} 192275970Scy 193275970Scy/* 194275970Scy * Fill the input buffer, do chunk decoding on the fly 195275970Scy */ 196275970Scystatic int 197275970Scyhttp_fillbuf(struct httpio *io, size_t len) 198275970Scy{ 199275970Scy if (io->error) 200275970Scy return (-1); 201275970Scy if (io->eof) 202275970Scy return (0); 203275970Scy 204275970Scy if (io->chunked == 0) { 205275970Scy if (http_growbuf(io, len) == -1) 206275970Scy return (-1); 207275970Scy if ((io->buflen = fetch_read(io->conn, io->buf, len)) == -1) { 208275970Scy io->error = 1; 209275970Scy return (-1); 210275970Scy } 211275970Scy io->bufpos = 0; 212275970Scy return (io->buflen); 213275970Scy } 214275970Scy 215275970Scy if (io->chunksize == 0) { 216275970Scy switch (http_new_chunk(io)) { 217275970Scy case -1: 218275970Scy io->error = 1; 219275970Scy return (-1); 220275970Scy case 0: 221275970Scy io->eof = 1; 222275970Scy return (0); 223275970Scy } 224275970Scy } 225275970Scy 226275970Scy if (len > io->chunksize) 227275970Scy len = io->chunksize; 228275970Scy if (http_growbuf(io, len) == -1) 229275970Scy return (-1); 230275970Scy if ((io->buflen = fetch_read(io->conn, io->buf, len)) == -1) { 231275970Scy io->error = 1; 232275970Scy return (-1); 233275970Scy } 234275970Scy io->chunksize -= io->buflen; 235275970Scy 236275970Scy if (io->chunksize == 0) { 237275970Scy char endl[2]; 238275970Scy 239275970Scy if (fetch_read(io->conn, endl, 2) != 2 || 240275970Scy endl[0] != '\r' || endl[1] != '\n') 241275970Scy return (-1); 242275970Scy } 243275970Scy 244275970Scy io->bufpos = 0; 245275970Scy 246275970Scy return (io->buflen); 247275970Scy} 248275970Scy 249275970Scy/* 250275970Scy * Read function 251275970Scy */ 252275970Scystatic int 253275970Scyhttp_readfn(void *v, char *buf, int len) 254275970Scy{ 255275970Scy struct httpio *io = (struct httpio *)v; 256275970Scy int l, pos; 257275970Scy 258275970Scy if (io->error) 259275970Scy return (-1); 260275970Scy if (io->eof) 261275970Scy return (0); 262275970Scy 263275970Scy for (pos = 0; len > 0; pos += l, len -= l) { 264275970Scy /* empty buffer */ 265275970Scy if (!io->buf || io->bufpos == io->buflen) 266275970Scy if (http_fillbuf(io, len) < 1) 267275970Scy break; 268275970Scy l = io->buflen - io->bufpos; 269275970Scy if (len < l) 270275970Scy l = len; 271275970Scy memcpy(buf + pos, io->buf + io->bufpos, l); 272275970Scy io->bufpos += l; 273275970Scy } 274275970Scy 275275970Scy if (!pos && io->error) 276275970Scy return (-1); 277275970Scy return (pos); 278275970Scy} 279275970Scy 280275970Scy/* 281275970Scy * Write function 282275970Scy */ 283275970Scystatic int 284275970Scyhttp_writefn(void *v, const char *buf, int len) 285275970Scy{ 286275970Scy struct httpio *io = (struct httpio *)v; 287275970Scy 288275970Scy return (fetch_write(io->conn, buf, len)); 289275970Scy} 290275970Scy 291275970Scy/* 292275970Scy * Close function 293275970Scy */ 294275970Scystatic int 295275970Scyhttp_closefn(void *v) 296275970Scy{ 297275970Scy struct httpio *io = (struct httpio *)v; 298275970Scy int r; 299275970Scy 300275970Scy r = fetch_close(io->conn); 301275970Scy if (io->buf) 302275970Scy free(io->buf); 303275970Scy free(io); 304275970Scy return (r); 305275970Scy} 306275970Scy 307275970Scy/* 308275970Scy * Wrap a file descriptor up 309275970Scy */ 310275970Scystatic FILE * 311275970Scyhttp_funopen(conn_t *conn, int chunked) 312275970Scy{ 313275970Scy struct httpio *io; 314275970Scy FILE *f; 315275970Scy 316275970Scy if ((io = calloc(1, sizeof(*io))) == NULL) { 317275970Scy fetch_syserr(); 318275970Scy return (NULL); 319275970Scy } 320275970Scy io->conn = conn; 321275970Scy io->chunked = chunked; 322275970Scy f = funopen(io, http_readfn, http_writefn, NULL, http_closefn); 323275970Scy if (f == NULL) { 324275970Scy fetch_syserr(); 325275970Scy free(io); 326275970Scy return (NULL); 327275970Scy } 328275970Scy return (f); 329275970Scy} 330275970Scy 331275970Scy 332275970Scy/***************************************************************************** 333275970Scy * Helper functions for talking to the server and parsing its replies 334275970Scy */ 335275970Scy 336275970Scy/* Header types */ 337275970Scytypedef enum { 338275970Scy hdr_syserror = -2, 339275970Scy hdr_error = -1, 340275970Scy hdr_end = 0, 341275970Scy hdr_unknown = 1, 342275970Scy hdr_content_length, 343275970Scy hdr_content_range, 344275970Scy hdr_last_modified, 345275970Scy hdr_location, 346275970Scy hdr_transfer_encoding, 347275970Scy hdr_www_authenticate, 348275970Scy hdr_proxy_authenticate, 349275970Scy} hdr_t; 350275970Scy 351275970Scy/* Names of interesting headers */ 352275970Scystatic struct { 353275970Scy hdr_t num; 354275970Scy const char *name; 355275970Scy} hdr_names[] = { 356275970Scy { hdr_content_length, "Content-Length" }, 357275970Scy { hdr_content_range, "Content-Range" }, 358275970Scy { hdr_last_modified, "Last-Modified" }, 359275970Scy { hdr_location, "Location" }, 360275970Scy { hdr_transfer_encoding, "Transfer-Encoding" }, 361275970Scy { hdr_www_authenticate, "WWW-Authenticate" }, 362275970Scy { hdr_proxy_authenticate, "Proxy-Authenticate" }, 363275970Scy { hdr_unknown, NULL }, 364275970Scy}; 365275970Scy 366275970Scy/* 367275970Scy * Send a formatted line; optionally echo to terminal 368275970Scy */ 369275970Scystatic int 370275970Scyhttp_cmd(conn_t *conn, const char *fmt, ...) 371275970Scy{ 372275970Scy va_list ap; 373275970Scy size_t len; 374275970Scy char *msg; 375275970Scy int r; 376275970Scy 377275970Scy va_start(ap, fmt); 378275970Scy len = vasprintf(&msg, fmt, ap); 379275970Scy va_end(ap); 380275970Scy 381275970Scy if (msg == NULL) { 382275970Scy errno = ENOMEM; 383275970Scy fetch_syserr(); 384275970Scy return (-1); 385275970Scy } 386275970Scy 387275970Scy r = fetch_putln(conn, msg, len); 388275970Scy free(msg); 389275970Scy 390275970Scy if (r == -1) { 391275970Scy fetch_syserr(); 392275970Scy return (-1); 393275970Scy } 394275970Scy 395275970Scy return (0); 396275970Scy} 397275970Scy 398275970Scy/* 399275970Scy * Get and parse status line 400275970Scy */ 401275970Scystatic int 402275970Scyhttp_get_reply(conn_t *conn) 403275970Scy{ 404275970Scy char *p; 405275970Scy 406275970Scy if (fetch_getln(conn) == -1) 407275970Scy return (-1); 408275970Scy /* 409275970Scy * A valid status line looks like "HTTP/m.n xyz reason" where m 410275970Scy * and n are the major and minor protocol version numbers and xyz 411275970Scy * is the reply code. 412275970Scy * Unfortunately, there are servers out there (NCSA 1.5.1, to name 413275970Scy * just one) that do not send a version number, so we can't rely 414275970Scy * on finding one, but if we do, insist on it being 1.0 or 1.1. 415275970Scy * We don't care about the reason phrase. 416275970Scy */ 417275970Scy if (strncmp(conn->buf, "HTTP", 4) != 0) 418275970Scy return (HTTP_PROTOCOL_ERROR); 419275970Scy p = conn->buf + 4; 420275970Scy if (*p == '/') { 421275970Scy if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) 422275970Scy return (HTTP_PROTOCOL_ERROR); 423275970Scy p += 4; 424275970Scy } 425275970Scy if (*p != ' ' || 426275970Scy !isdigit((unsigned char)p[1]) || 427275970Scy !isdigit((unsigned char)p[2]) || 428275970Scy !isdigit((unsigned char)p[3])) 429275970Scy return (HTTP_PROTOCOL_ERROR); 430275970Scy 431275970Scy conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'); 432275970Scy return (conn->err); 433275970Scy} 434275970Scy 435275970Scy/* 436275970Scy * Check a header; if the type matches the given string, return a pointer 437275970Scy * to the beginning of the value. 438275970Scy */ 439275970Scystatic const char * 440275970Scyhttp_match(const char *str, const char *hdr) 441275970Scy{ 442275970Scy while (*str && *hdr && 443275970Scy tolower((unsigned char)*str++) == tolower((unsigned char)*hdr++)) 444275970Scy /* nothing */; 445275970Scy if (*str || *hdr != ':') 446275970Scy return (NULL); 447275970Scy while (*hdr && isspace((unsigned char)*++hdr)) 448275970Scy /* nothing */; 449275970Scy return (hdr); 450275970Scy} 451275970Scy 452275970Scy 453275970Scy/* 454275970Scy * Get the next header and return the appropriate symbolic code. We 455275970Scy * need to read one line ahead for checking for a continuation line 456275970Scy * belonging to the current header (continuation lines start with 457275970Scy * white space). 458275970Scy * 459275970Scy * We get called with a fresh line already in the conn buffer, either 460275970Scy * from the previous http_next_header() invocation, or, the first 461275970Scy * time, from a fetch_getln() performed by our caller. 462275970Scy * 463275970Scy * This stops when we encounter an empty line (we dont read beyond the header 464275970Scy * area). 465275970Scy * 466275970Scy * Note that the "headerbuf" is just a place to return the result. Its 467275970Scy * contents are not used for the next call. This means that no cleanup 468275970Scy * is needed when ie doing another connection, just call the cleanup when 469275970Scy * fully done to deallocate memory. 470275970Scy */ 471275970Scy 472275970Scy/* Limit the max number of continuation lines to some reasonable value */ 473275970Scy#define HTTP_MAX_CONT_LINES 10 474275970Scy 475275970Scy/* Place into which to build a header from one or several lines */ 476275970Scytypedef struct { 477275970Scy char *buf; /* buffer */ 478275970Scy size_t bufsize; /* buffer size */ 479275970Scy size_t buflen; /* length of buffer contents */ 480275970Scy} http_headerbuf_t; 481275970Scy 482275970Scystatic void 483275970Scyinit_http_headerbuf(http_headerbuf_t *buf) 484275970Scy{ 485275970Scy buf->buf = NULL; 486275970Scy buf->bufsize = 0; 487275970Scy buf->buflen = 0; 488275970Scy} 489275970Scy 490275970Scystatic void 491275970Scyclean_http_headerbuf(http_headerbuf_t *buf) 492275970Scy{ 493275970Scy if (buf->buf) 494275970Scy free(buf->buf); 495275970Scy init_http_headerbuf(buf); 496275970Scy} 497275970Scy 498275970Scy/* Remove whitespace at the end of the buffer */ 499275970Scystatic void 500275970Scyhttp_conn_trimright(conn_t *conn) 501275970Scy{ 502275970Scy while (conn->buflen && 503275970Scy isspace((unsigned char)conn->buf[conn->buflen - 1])) 504275970Scy conn->buflen--; 505275970Scy conn->buf[conn->buflen] = '\0'; 506275970Scy} 507275970Scy 508275970Scystatic hdr_t 509275970Scyhttp_next_header(conn_t *conn, http_headerbuf_t *hbuf, const char **p) 510275970Scy{ 511275970Scy unsigned int i, len; 512275970Scy 513275970Scy /* 514275970Scy * Have to do the stripping here because of the first line. So 515275970Scy * it's done twice for the subsequent lines. No big deal 516275970Scy */ 517275970Scy http_conn_trimright(conn); 518275970Scy if (conn->buflen == 0) 519275970Scy return (hdr_end); 520275970Scy 521275970Scy /* Copy the line to the headerbuf */ 522275970Scy if (hbuf->bufsize < conn->buflen + 1) { 523275970Scy if ((hbuf->buf = realloc(hbuf->buf, conn->buflen + 1)) == NULL) 524275970Scy return (hdr_syserror); 525275970Scy hbuf->bufsize = conn->buflen + 1; 526275970Scy } 527275970Scy strcpy(hbuf->buf, conn->buf); 528275970Scy hbuf->buflen = conn->buflen; 529275970Scy 530275970Scy /* 531275970Scy * Fetch possible continuation lines. Stop at 1st non-continuation 532275970Scy * and leave it in the conn buffer 533275970Scy */ 534275970Scy for (i = 0; i < HTTP_MAX_CONT_LINES; i++) { 535275970Scy if (fetch_getln(conn) == -1) 536275970Scy return (hdr_syserror); 537275970Scy 538275970Scy /* 539275970Scy * Note: we carry on the idea from the previous version 540275970Scy * that a pure whitespace line is equivalent to an empty 541275970Scy * one (so it's not continuation and will be handled when 542275970Scy * we are called next) 543275970Scy */ 544275970Scy http_conn_trimright(conn); 545275970Scy if (conn->buf[0] != ' ' && conn->buf[0] != "\t"[0]) 546275970Scy break; 547275970Scy 548275970Scy /* Got a continuation line. Concatenate to previous */ 549275970Scy len = hbuf->buflen + conn->buflen; 550275970Scy if (hbuf->bufsize < len + 1) { 551275970Scy len *= 2; 552275970Scy if ((hbuf->buf = realloc(hbuf->buf, len + 1)) == NULL) 553275970Scy return (hdr_syserror); 554275970Scy hbuf->bufsize = len + 1; 555275970Scy } 556275970Scy strcpy(hbuf->buf + hbuf->buflen, conn->buf); 557275970Scy hbuf->buflen += conn->buflen; 558275970Scy } 559275970Scy 560275970Scy /* 561275970Scy * We could check for malformed headers but we don't really care. 562275970Scy * A valid header starts with a token immediately followed by a 563275970Scy * colon; a token is any sequence of non-control, non-whitespace 564275970Scy * characters except "()<>@,;:\\\"{}". 565275970Scy */ 566275970Scy for (i = 0; hdr_names[i].num != hdr_unknown; i++) 567275970Scy if ((*p = http_match(hdr_names[i].name, hbuf->buf)) != NULL) 568275970Scy return (hdr_names[i].num); 569275970Scy 570275970Scy return (hdr_unknown); 571275970Scy} 572275970Scy 573275970Scy/************************** 574275970Scy * [Proxy-]Authenticate header parsing 575275970Scy */ 576275970Scy 577275970Scy/* 578275970Scy * Read doublequote-delimited string into output buffer obuf (allocated 579275970Scy * by caller, whose responsibility it is to ensure that it's big enough) 580275970Scy * cp points to the first char after the initial '"' 581275970Scy * Handles \ quoting 582275970Scy * Returns pointer to the first char after the terminating double quote, or 583275970Scy * NULL for error. 584275970Scy */ 585275970Scystatic const char * 586275970Scyhttp_parse_headerstring(const char *cp, char *obuf) 587275970Scy{ 588275970Scy for (;;) { 589275970Scy switch (*cp) { 590275970Scy case 0: /* Unterminated string */ 591275970Scy *obuf = 0; 592275970Scy return (NULL); 593275970Scy case '"': /* Ending quote */ 594275970Scy *obuf = 0; 595275970Scy return (++cp); 596275970Scy case '\\': 597275970Scy if (*++cp == 0) { 598275970Scy *obuf = 0; 599275970Scy return (NULL); 600275970Scy } 601275970Scy /* FALLTHROUGH */ 602275970Scy default: 603275970Scy *obuf++ = *cp++; 604275970Scy } 605275970Scy } 606275970Scy} 607275970Scy 608275970Scy/* Http auth challenge schemes */ 609275970Scytypedef enum {HTTPAS_UNKNOWN, HTTPAS_BASIC,HTTPAS_DIGEST} http_auth_schemes_t; 610275970Scy 611275970Scy/* Data holder for a Basic or Digest challenge. */ 612275970Scytypedef struct { 613275970Scy http_auth_schemes_t scheme; 614275970Scy char *realm; 615275970Scy char *qop; 616275970Scy char *nonce; 617275970Scy char *opaque; 618275970Scy char *algo; 619275970Scy int stale; 620275970Scy int nc; /* Nonce count */ 621275970Scy} http_auth_challenge_t; 622275970Scy 623275970Scystatic void 624275970Scyinit_http_auth_challenge(http_auth_challenge_t *b) 625275970Scy{ 626275970Scy b->scheme = HTTPAS_UNKNOWN; 627275970Scy b->realm = b->qop = b->nonce = b->opaque = b->algo = NULL; 628275970Scy b->stale = b->nc = 0; 629275970Scy} 630275970Scy 631275970Scystatic void 632275970Scyclean_http_auth_challenge(http_auth_challenge_t *b) 633275970Scy{ 634275970Scy if (b->realm) 635275970Scy free(b->realm); 636275970Scy if (b->qop) 637275970Scy free(b->qop); 638275970Scy if (b->nonce) 639275970Scy free(b->nonce); 640275970Scy if (b->opaque) 641275970Scy free(b->opaque); 642275970Scy if (b->algo) 643275970Scy free(b->algo); 644275970Scy init_http_auth_challenge(b); 645275970Scy} 646275970Scy 647275970Scy/* Data holder for an array of challenges offered in an http response. */ 648275970Scy#define MAX_CHALLENGES 10 649275970Scytypedef struct { 650275970Scy http_auth_challenge_t *challenges[MAX_CHALLENGES]; 651275970Scy int count; /* Number of parsed challenges in the array */ 652275970Scy int valid; /* We did parse an authenticate header */ 653275970Scy} http_auth_challenges_t; 654275970Scy 655275970Scystatic void 656275970Scyinit_http_auth_challenges(http_auth_challenges_t *cs) 657275970Scy{ 658275970Scy int i; 659275970Scy for (i = 0; i < MAX_CHALLENGES; i++) 660275970Scy cs->challenges[i] = NULL; 661275970Scy cs->count = cs->valid = 0; 662275970Scy} 663275970Scy 664275970Scystatic void 665275970Scyclean_http_auth_challenges(http_auth_challenges_t *cs) 666275970Scy{ 667275970Scy int i; 668275970Scy /* We rely on non-zero pointers being allocated, not on the count */ 669275970Scy for (i = 0; i < MAX_CHALLENGES; i++) { 670275970Scy if (cs->challenges[i] != NULL) { 671275970Scy clean_http_auth_challenge(cs->challenges[i]); 672275970Scy free(cs->challenges[i]); 673275970Scy } 674275970Scy } 675275970Scy init_http_auth_challenges(cs); 676275970Scy} 677275970Scy 678275970Scy/* 679275970Scy * Enumeration for lexical elements. Separators will be returned as their own 680275970Scy * ascii value 681275970Scy */ 682275970Scytypedef enum {HTTPHL_WORD=256, HTTPHL_STRING=257, HTTPHL_END=258, 683275970Scy HTTPHL_ERROR = 259} http_header_lex_t; 684275970Scy 685275970Scy/* 686275970Scy * Determine what kind of token comes next and return possible value 687275970Scy * in buf, which is supposed to have been allocated big enough by 688275970Scy * caller. Advance input pointer and return element type. 689275970Scy */ 690275970Scystatic int 691275970Scyhttp_header_lex(const char **cpp, char *buf) 692275970Scy{ 693275970Scy size_t l; 694275970Scy /* Eat initial whitespace */ 695275970Scy *cpp += strspn(*cpp, " \t"); 696275970Scy if (**cpp == 0) 697275970Scy return (HTTPHL_END); 698275970Scy 699275970Scy /* Separator ? */ 700275970Scy if (**cpp == ',' || **cpp == '=') 701275970Scy return (*((*cpp)++)); 702275970Scy 703275970Scy /* String ? */ 704275970Scy if (**cpp == '"') { 705275970Scy *cpp = http_parse_headerstring(++*cpp, buf); 706275970Scy if (*cpp == NULL) 707275970Scy return (HTTPHL_ERROR); 708275970Scy return (HTTPHL_STRING); 709275970Scy } 710275970Scy 711275970Scy /* Read other token, until separator or whitespace */ 712275970Scy l = strcspn(*cpp, " \t,="); 713275970Scy memcpy(buf, *cpp, l); 714275970Scy buf[l] = 0; 715275970Scy *cpp += l; 716275970Scy return (HTTPHL_WORD); 717275970Scy} 718275970Scy 719275970Scy/* 720275970Scy * Read challenges from http xxx-authenticate header and accumulate them 721275970Scy * in the challenges list structure. 722275970Scy * 723275970Scy * Headers with multiple challenges are specified by rfc2617, but 724275970Scy * servers (ie: squid) often send them in separate headers instead, 725275970Scy * which in turn is forbidden by the http spec (multiple headers with 726275970Scy * the same name are only allowed for pure comma-separated lists, see 727275970Scy * rfc2616 sec 4.2). 728275970Scy * 729275970Scy * We support both approaches anyway 730275970Scy */ 731275970Scystatic int 732275970Scyhttp_parse_authenticate(const char *cp, http_auth_challenges_t *cs) 733275970Scy{ 734275970Scy int ret = -1; 735275970Scy http_header_lex_t lex; 736275970Scy char *key = malloc(strlen(cp) + 1); 737275970Scy char *value = malloc(strlen(cp) + 1); 738275970Scy char *buf = malloc(strlen(cp) + 1); 739275970Scy 740275970Scy if (key == NULL || value == NULL || buf == NULL) { 741275970Scy fetch_syserr(); 742275970Scy goto out; 743275970Scy } 744275970Scy 745275970Scy /* In any case we've seen the header and we set the valid bit */ 746275970Scy cs->valid = 1; 747275970Scy 748275970Scy /* Need word first */ 749275970Scy lex = http_header_lex(&cp, key); 750275970Scy if (lex != HTTPHL_WORD) 751275970Scy goto out; 752275970Scy 753275970Scy /* Loop on challenges */ 754275970Scy for (; cs->count < MAX_CHALLENGES; cs->count++) { 755275970Scy cs->challenges[cs->count] = 756275970Scy malloc(sizeof(http_auth_challenge_t)); 757275970Scy if (cs->challenges[cs->count] == NULL) { 758275970Scy fetch_syserr(); 759275970Scy goto out; 760275970Scy } 761275970Scy init_http_auth_challenge(cs->challenges[cs->count]); 762275970Scy if (!strcasecmp(key, "basic")) { 763275970Scy cs->challenges[cs->count]->scheme = HTTPAS_BASIC; 764275970Scy } else if (!strcasecmp(key, "digest")) { 765275970Scy cs->challenges[cs->count]->scheme = HTTPAS_DIGEST; 766275970Scy } else { 767275970Scy cs->challenges[cs->count]->scheme = HTTPAS_UNKNOWN; 768275970Scy /* 769275970Scy * Continue parsing as basic or digest may 770275970Scy * follow, and the syntax is the same for 771275970Scy * all. We'll just ignore this one when 772275970Scy * looking at the list 773275970Scy */ 774275970Scy } 775275970Scy 776275970Scy /* Loop on attributes */ 777275970Scy for (;;) { 778275970Scy /* Key */ 779275970Scy lex = http_header_lex(&cp, key); 780275970Scy if (lex != HTTPHL_WORD) 781275970Scy goto out; 782275970Scy 783275970Scy /* Equal sign */ 784275970Scy lex = http_header_lex(&cp, buf); 785275970Scy if (lex != '=') 786275970Scy goto out; 787275970Scy 788275970Scy /* Value */ 789275970Scy lex = http_header_lex(&cp, value); 790275970Scy if (lex != HTTPHL_WORD && lex != HTTPHL_STRING) 791275970Scy goto out; 792275970Scy 793275970Scy if (!strcasecmp(key, "realm")) 794275970Scy cs->challenges[cs->count]->realm = 795275970Scy strdup(value); 796275970Scy else if (!strcasecmp(key, "qop")) 797275970Scy cs->challenges[cs->count]->qop = 798275970Scy strdup(value); 799275970Scy else if (!strcasecmp(key, "nonce")) 800275970Scy cs->challenges[cs->count]->nonce = 801275970Scy strdup(value); 802275970Scy else if (!strcasecmp(key, "opaque")) 803275970Scy cs->challenges[cs->count]->opaque = 804275970Scy strdup(value); 805275970Scy else if (!strcasecmp(key, "algorithm")) 806275970Scy cs->challenges[cs->count]->algo = 807275970Scy strdup(value); 808275970Scy else if (!strcasecmp(key, "stale")) 809275970Scy cs->challenges[cs->count]->stale = 810275970Scy strcasecmp(value, "no"); 811275970Scy /* Else ignore unknown attributes */ 812275970Scy 813275970Scy /* Comma or Next challenge or End */ 814275970Scy lex = http_header_lex(&cp, key); 815275970Scy /* 816275970Scy * If we get a word here, this is the beginning of the 817275970Scy * next challenge. Break the attributes loop 818275970Scy */ 819275970Scy if (lex == HTTPHL_WORD) 820275970Scy break; 821275970Scy 822275970Scy if (lex == HTTPHL_END) { 823275970Scy /* End while looking for ',' is normal exit */ 824275970Scy cs->count++; 825275970Scy ret = 0; 826275970Scy goto out; 827275970Scy } 828275970Scy /* Anything else is an error */ 829275970Scy if (lex != ',') 830275970Scy goto out; 831275970Scy 832275970Scy } /* End attributes loop */ 833275970Scy } /* End challenge loop */ 834275970Scy 835275970Scy /* 836275970Scy * Challenges max count exceeded. This really can't happen 837275970Scy * with normal data, something's fishy -> error 838275970Scy */ 839275970Scy 840275970Scyout: 841275970Scy if (key) 842275970Scy free(key); 843275970Scy if (value) 844275970Scy free(value); 845275970Scy if (buf) 846275970Scy free(buf); 847275970Scy return (ret); 848275970Scy} 849275970Scy 850275970Scy 851275970Scy/* 852275970Scy * Parse a last-modified header 853275970Scy */ 854275970Scystatic int 855275970Scyhttp_parse_mtime(const char *p, time_t *mtime) 856275970Scy{ 857275970Scy char locale[64], *r; 858275970Scy struct tm tm; 859275970Scy 860275970Scy strncpy(locale, setlocale(LC_TIME, NULL), sizeof(locale)); 861275970Scy setlocale(LC_TIME, "C"); 862275970Scy r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 863275970Scy /* XXX should add support for date-2 and date-3 */ 864275970Scy setlocale(LC_TIME, locale); 865275970Scy if (r == NULL) 866275970Scy return (-1); 867275970Scy DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d " 868275970Scy "%02d:%02d:%02d]\n", 869275970Scy tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 870275970Scy tm.tm_hour, tm.tm_min, tm.tm_sec)); 871275970Scy *mtime = timegm(&tm); 872275970Scy return (0); 873275970Scy} 874275970Scy 875275970Scy/* 876275970Scy * Parse a content-length header 877275970Scy */ 878275970Scystatic int 879275970Scyhttp_parse_length(const char *p, off_t *length) 880275970Scy{ 881275970Scy off_t len; 882275970Scy 883275970Scy for (len = 0; *p && isdigit((unsigned char)*p); ++p) 884275970Scy len = len * 10 + (*p - '0'); 885275970Scy if (*p) 886275970Scy return (-1); 887275970Scy DEBUG(fprintf(stderr, "content length: [%lld]\n", 888275970Scy (long long)len)); 889275970Scy *length = len; 890275970Scy return (0); 891275970Scy} 892275970Scy 893275970Scy/* 894275970Scy * Parse a content-range header 895275970Scy */ 896275970Scystatic int 897275970Scyhttp_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) 898275970Scy{ 899275970Scy off_t first, last, len; 900275970Scy 901275970Scy if (strncasecmp(p, "bytes ", 6) != 0) 902275970Scy return (-1); 903275970Scy p += 6; 904275970Scy if (*p == '*') { 905275970Scy first = last = -1; 906275970Scy ++p; 907275970Scy } else { 908275970Scy for (first = 0; *p && isdigit((unsigned char)*p); ++p) 909275970Scy first = first * 10 + *p - '0'; 910275970Scy if (*p != '-') 911275970Scy return (-1); 912275970Scy for (last = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 913275970Scy last = last * 10 + *p - '0'; 914275970Scy } 915275970Scy if (first > last || *p != '/') 916275970Scy return (-1); 917275970Scy for (len = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 918275970Scy len = len * 10 + *p - '0'; 919275970Scy if (*p || len < last - first + 1) 920275970Scy return (-1); 921275970Scy if (first == -1) { 922275970Scy DEBUG(fprintf(stderr, "content range: [*/%lld]\n", 923275970Scy (long long)len)); 924275970Scy *length = 0; 925275970Scy } else { 926275970Scy DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n", 927275970Scy (long long)first, (long long)last, (long long)len)); 928275970Scy *length = last - first + 1; 929275970Scy } 930275970Scy *offset = first; 931275970Scy *size = len; 932275970Scy return (0); 933275970Scy} 934275970Scy 935275970Scy 936275970Scy/***************************************************************************** 937275970Scy * Helper functions for authorization 938275970Scy */ 939275970Scy 940275970Scy/* 941275970Scy * Base64 encoding 942275970Scy */ 943275970Scystatic char * 944275970Scyhttp_base64(const char *src) 945275970Scy{ 946275970Scy static const char base64[] = 947275970Scy "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 948275970Scy "abcdefghijklmnopqrstuvwxyz" 949275970Scy "0123456789+/"; 950275970Scy char *str, *dst; 951275970Scy size_t l; 952275970Scy int t, r; 953275970Scy 954275970Scy l = strlen(src); 955275970Scy if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL) 956275970Scy return (NULL); 957275970Scy dst = str; 958275970Scy r = 0; 959275970Scy 960275970Scy while (l >= 3) { 961275970Scy t = (src[0] << 16) | (src[1] << 8) | src[2]; 962275970Scy dst[0] = base64[(t >> 18) & 0x3f]; 963275970Scy dst[1] = base64[(t >> 12) & 0x3f]; 964275970Scy dst[2] = base64[(t >> 6) & 0x3f]; 965275970Scy dst[3] = base64[(t >> 0) & 0x3f]; 966275970Scy src += 3; l -= 3; 967275970Scy dst += 4; r += 4; 968275970Scy } 969275970Scy 970275970Scy switch (l) { 971275970Scy case 2: 972275970Scy t = (src[0] << 16) | (src[1] << 8); 973275970Scy dst[0] = base64[(t >> 18) & 0x3f]; 974275970Scy dst[1] = base64[(t >> 12) & 0x3f]; 975275970Scy dst[2] = base64[(t >> 6) & 0x3f]; 976275970Scy dst[3] = '='; 977275970Scy dst += 4; 978275970Scy r += 4; 979275970Scy break; 980275970Scy case 1: 981275970Scy t = src[0] << 16; 982275970Scy dst[0] = base64[(t >> 18) & 0x3f]; 983275970Scy dst[1] = base64[(t >> 12) & 0x3f]; 984275970Scy dst[2] = dst[3] = '='; 985275970Scy dst += 4; 986275970Scy r += 4; 987275970Scy break; 988275970Scy case 0: 989275970Scy break; 990275970Scy } 991275970Scy 992275970Scy *dst = 0; 993275970Scy return (str); 994275970Scy} 995275970Scy 996275970Scy 997275970Scy/* 998275970Scy * Extract authorization parameters from environment value. 999275970Scy * The value is like scheme:realm:user:pass 1000275970Scy */ 1001275970Scytypedef struct { 1002275970Scy char *scheme; 1003275970Scy char *realm; 1004275970Scy char *user; 1005275970Scy char *password; 1006275970Scy} http_auth_params_t; 1007275970Scy 1008275970Scystatic void 1009275970Scyinit_http_auth_params(http_auth_params_t *s) 1010275970Scy{ 1011275970Scy s->scheme = s->realm = s->user = s->password = 0; 1012275970Scy} 1013275970Scy 1014275970Scystatic void 1015275970Scyclean_http_auth_params(http_auth_params_t *s) 1016275970Scy{ 1017275970Scy if (s->scheme) 1018275970Scy free(s->scheme); 1019275970Scy if (s->realm) 1020275970Scy free(s->realm); 1021275970Scy if (s->user) 1022275970Scy free(s->user); 1023275970Scy if (s->password) 1024275970Scy free(s->password); 1025275970Scy init_http_auth_params(s); 1026275970Scy} 1027275970Scy 1028275970Scystatic int 1029275970Scyhttp_authfromenv(const char *p, http_auth_params_t *parms) 1030275970Scy{ 1031275970Scy int ret = -1; 1032275970Scy char *v, *ve; 1033275970Scy char *str = strdup(p); 1034275970Scy 1035275970Scy if (str == NULL) { 1036275970Scy fetch_syserr(); 1037275970Scy return (-1); 1038275970Scy } 1039275970Scy v = str; 1040275970Scy 1041275970Scy if ((ve = strchr(v, ':')) == NULL) 1042275970Scy goto out; 1043275970Scy 1044275970Scy *ve = 0; 1045275970Scy if ((parms->scheme = strdup(v)) == NULL) { 1046275970Scy fetch_syserr(); 1047275970Scy goto out; 1048275970Scy } 1049275970Scy v = ve + 1; 1050275970Scy 1051275970Scy if ((ve = strchr(v, ':')) == NULL) 1052275970Scy goto out; 1053275970Scy 1054275970Scy *ve = 0; 1055275970Scy if ((parms->realm = strdup(v)) == NULL) { 1056275970Scy fetch_syserr(); 1057275970Scy goto out; 1058275970Scy } 1059275970Scy v = ve + 1; 1060275970Scy 1061275970Scy if ((ve = strchr(v, ':')) == NULL) 1062275970Scy goto out; 1063275970Scy 1064275970Scy *ve = 0; 1065275970Scy if ((parms->user = strdup(v)) == NULL) { 1066275970Scy fetch_syserr(); 1067275970Scy goto out; 1068275970Scy } 1069275970Scy v = ve + 1; 1070275970Scy 1071275970Scy 1072275970Scy if ((parms->password = strdup(v)) == NULL) { 1073275970Scy fetch_syserr(); 1074275970Scy goto out; 1075275970Scy } 1076275970Scy ret = 0; 1077275970Scyout: 1078275970Scy if (ret == -1) 1079275970Scy clean_http_auth_params(parms); 1080275970Scy if (str) 1081275970Scy free(str); 1082275970Scy return (ret); 1083275970Scy} 1084275970Scy 1085275970Scy 1086275970Scy/* 1087275970Scy * Digest response: the code to compute the digest is taken from the 1088275970Scy * sample implementation in RFC2616 1089275970Scy */ 1090275970Scy#define IN const 1091275970Scy#define OUT 1092275970Scy 1093275970Scy#define HASHLEN 16 1094275970Scytypedef char HASH[HASHLEN]; 1095275970Scy#define HASHHEXLEN 32 1096275970Scytypedef char HASHHEX[HASHHEXLEN+1]; 1097275970Scy 1098275970Scystatic const char *hexchars = "0123456789abcdef"; 1099275970Scystatic void 1100275970ScyCvtHex(IN HASH Bin, OUT HASHHEX Hex) 1101275970Scy{ 1102275970Scy unsigned short i; 1103275970Scy unsigned char j; 1104275970Scy 1105275970Scy for (i = 0; i < HASHLEN; i++) { 1106275970Scy j = (Bin[i] >> 4) & 0xf; 1107275970Scy Hex[i*2] = hexchars[j]; 1108275970Scy j = Bin[i] & 0xf; 1109275970Scy Hex[i*2+1] = hexchars[j]; 1110275970Scy }; 1111275970Scy Hex[HASHHEXLEN] = '\0'; 1112275970Scy}; 1113275970Scy 1114275970Scy/* calculate H(A1) as per spec */ 1115275970Scystatic void 1116275970ScyDigestCalcHA1( 1117275970Scy IN char * pszAlg, 1118275970Scy IN char * pszUserName, 1119275970Scy IN char * pszRealm, 1120275970Scy IN char * pszPassword, 1121275970Scy IN char * pszNonce, 1122275970Scy IN char * pszCNonce, 1123275970Scy OUT HASHHEX SessionKey 1124275970Scy ) 1125275970Scy{ 1126275970Scy MD5_CTX Md5Ctx; 1127275970Scy HASH HA1; 1128275970Scy 1129275970Scy MD5Init(&Md5Ctx); 1130275970Scy MD5Update(&Md5Ctx, pszUserName, strlen(pszUserName)); 1131275970Scy MD5Update(&Md5Ctx, ":", 1); 1132275970Scy MD5Update(&Md5Ctx, pszRealm, strlen(pszRealm)); 1133275970Scy MD5Update(&Md5Ctx, ":", 1); 1134275970Scy MD5Update(&Md5Ctx, pszPassword, strlen(pszPassword)); 1135275970Scy MD5Final(HA1, &Md5Ctx); 1136275970Scy if (strcasecmp(pszAlg, "md5-sess") == 0) { 1137275970Scy 1138275970Scy MD5Init(&Md5Ctx); 1139275970Scy MD5Update(&Md5Ctx, HA1, HASHLEN); 1140275970Scy MD5Update(&Md5Ctx, ":", 1); 1141275970Scy MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); 1142275970Scy MD5Update(&Md5Ctx, ":", 1); 1143275970Scy MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); 1144275970Scy MD5Final(HA1, &Md5Ctx); 1145275970Scy }; 1146275970Scy CvtHex(HA1, SessionKey); 1147275970Scy} 1148275970Scy 1149275970Scy/* calculate request-digest/response-digest as per HTTP Digest spec */ 1150275970Scystatic void 1151275970ScyDigestCalcResponse( 1152275970Scy IN HASHHEX HA1, /* H(A1) */ 1153275970Scy IN char * pszNonce, /* nonce from server */ 1154275970Scy IN char * pszNonceCount, /* 8 hex digits */ 1155275970Scy IN char * pszCNonce, /* client nonce */ 1156275970Scy IN char * pszQop, /* qop-value: "", "auth", "auth-int" */ 1157275970Scy IN char * pszMethod, /* method from the request */ 1158275970Scy IN char * pszDigestUri, /* requested URL */ 1159275970Scy IN HASHHEX HEntity, /* H(entity body) if qop="auth-int" */ 1160275970Scy OUT HASHHEX Response /* request-digest or response-digest */ 1161275970Scy ) 1162275970Scy{ 1163275970Scy/* DEBUG(fprintf(stderr, 1164275970Scy "Calc: HA1[%s] Nonce[%s] qop[%s] method[%s] URI[%s]\n", 1165275970Scy HA1, pszNonce, pszQop, pszMethod, pszDigestUri));*/ 1166275970Scy MD5_CTX Md5Ctx; 1167275970Scy HASH HA2; 1168275970Scy HASH RespHash; 1169275970Scy HASHHEX HA2Hex; 1170275970Scy 1171275970Scy // calculate H(A2) 1172275970Scy MD5Init(&Md5Ctx); 1173275970Scy MD5Update(&Md5Ctx, pszMethod, strlen(pszMethod)); 1174275970Scy MD5Update(&Md5Ctx, ":", 1); 1175275970Scy MD5Update(&Md5Ctx, pszDigestUri, strlen(pszDigestUri)); 1176275970Scy if (strcasecmp(pszQop, "auth-int") == 0) { 1177275970Scy MD5Update(&Md5Ctx, ":", 1); 1178275970Scy MD5Update(&Md5Ctx, HEntity, HASHHEXLEN); 1179275970Scy }; 1180275970Scy MD5Final(HA2, &Md5Ctx); 1181275970Scy CvtHex(HA2, HA2Hex); 1182275970Scy 1183275970Scy // calculate response 1184275970Scy MD5Init(&Md5Ctx); 1185275970Scy MD5Update(&Md5Ctx, HA1, HASHHEXLEN); 1186275970Scy MD5Update(&Md5Ctx, ":", 1); 1187275970Scy MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); 1188275970Scy MD5Update(&Md5Ctx, ":", 1); 1189275970Scy if (*pszQop) { 1190275970Scy MD5Update(&Md5Ctx, pszNonceCount, strlen(pszNonceCount)); 1191275970Scy MD5Update(&Md5Ctx, ":", 1); 1192275970Scy MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); 1193275970Scy MD5Update(&Md5Ctx, ":", 1); 1194275970Scy MD5Update(&Md5Ctx, pszQop, strlen(pszQop)); 1195275970Scy MD5Update(&Md5Ctx, ":", 1); 1196275970Scy }; 1197275970Scy MD5Update(&Md5Ctx, HA2Hex, HASHHEXLEN); 1198275970Scy MD5Final(RespHash, &Md5Ctx); 1199275970Scy CvtHex(RespHash, Response); 1200275970Scy} 1201275970Scy 1202275970Scy/* 1203275970Scy * Generate/Send a Digest authorization header 1204275970Scy * This looks like: [Proxy-]Authorization: credentials 1205275970Scy * 1206275970Scy * credentials = "Digest" digest-response 1207275970Scy * digest-response = 1#( username | realm | nonce | digest-uri 1208275970Scy * | response | [ algorithm ] | [cnonce] | 1209275970Scy * [opaque] | [message-qop] | 1210275970Scy * [nonce-count] | [auth-param] ) 1211275970Scy * username = "username" "=" username-value 1212275970Scy * username-value = quoted-string 1213275970Scy * digest-uri = "uri" "=" digest-uri-value 1214275970Scy * digest-uri-value = request-uri ; As specified by HTTP/1.1 1215275970Scy * message-qop = "qop" "=" qop-value 1216275970Scy * cnonce = "cnonce" "=" cnonce-value 1217275970Scy * cnonce-value = nonce-value 1218275970Scy * nonce-count = "nc" "=" nc-value 1219275970Scy * nc-value = 8LHEX 1220275970Scy * response = "response" "=" request-digest 1221275970Scy * request-digest = <"> 32LHEX <"> 1222275970Scy */ 1223275970Scystatic int 1224275970Scyhttp_digest_auth(conn_t *conn, const char *hdr, http_auth_challenge_t *c, 1225275970Scy http_auth_params_t *parms, struct url *url) 1226275970Scy{ 1227275970Scy int r; 1228275970Scy char noncecount[10]; 1229275970Scy char cnonce[40]; 1230275970Scy char *options = 0; 1231275970Scy 1232275970Scy if (!c->realm || !c->nonce) { 1233275970Scy DEBUG(fprintf(stderr, "realm/nonce not set in challenge\n")); 1234275970Scy return(-1); 1235275970Scy } 1236275970Scy if (!c->algo) 1237275970Scy c->algo = strdup(""); 1238275970Scy 1239275970Scy if (asprintf(&options, "%s%s%s%s", 1240275970Scy *c->algo? ",algorithm=" : "", c->algo, 1241275970Scy c->opaque? ",opaque=" : "", c->opaque?c->opaque:"")== -1) 1242275970Scy return (-1); 1243275970Scy 1244275970Scy if (!c->qop) { 1245275970Scy c->qop = strdup(""); 1246275970Scy *noncecount = 0; 1247275970Scy *cnonce = 0; 1248275970Scy } else { 1249275970Scy c->nc++; 1250275970Scy sprintf(noncecount, "%08x", c->nc); 1251275970Scy /* We don't try very hard with the cnonce ... */ 1252275970Scy sprintf(cnonce, "%x%lx", getpid(), (unsigned long)time(0)); 1253275970Scy } 1254275970Scy 1255275970Scy HASHHEX HA1; 1256275970Scy DigestCalcHA1(c->algo, parms->user, c->realm, 1257275970Scy parms->password, c->nonce, cnonce, HA1); 1258275970Scy DEBUG(fprintf(stderr, "HA1: [%s]\n", HA1)); 1259275970Scy HASHHEX digest; 1260275970Scy DigestCalcResponse(HA1, c->nonce, noncecount, cnonce, c->qop, 1261275970Scy "GET", url->doc, "", digest); 1262275970Scy 1263275970Scy if (c->qop[0]) { 1264275970Scy r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," 1265275970Scy "nonce=\"%s\",uri=\"%s\",response=\"%s\"," 1266275970Scy "qop=\"auth\", cnonce=\"%s\", nc=%s%s", 1267275970Scy hdr, parms->user, c->realm, 1268275970Scy c->nonce, url->doc, digest, 1269275970Scy cnonce, noncecount, options); 1270275970Scy } else { 1271275970Scy r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," 1272275970Scy "nonce=\"%s\",uri=\"%s\",response=\"%s\"%s", 1273275970Scy hdr, parms->user, c->realm, 1274275970Scy c->nonce, url->doc, digest, options); 1275275970Scy } 1276275970Scy if (options) 1277275970Scy free(options); 1278275970Scy return (r); 1279275970Scy} 1280275970Scy 1281275970Scy/* 1282275970Scy * Encode username and password 1283275970Scy */ 1284275970Scystatic int 1285275970Scyhttp_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd) 1286275970Scy{ 1287275970Scy char *upw, *auth; 1288275970Scy int r; 1289275970Scy 1290275970Scy DEBUG(fprintf(stderr, "basic: usr: [%s]\n", usr)); 1291275970Scy DEBUG(fprintf(stderr, "basic: pwd: [%s]\n", pwd)); 1292275970Scy if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 1293275970Scy return (-1); 1294275970Scy auth = http_base64(upw); 1295275970Scy free(upw); 1296275970Scy if (auth == NULL) 1297275970Scy return (-1); 1298275970Scy r = http_cmd(conn, "%s: Basic %s", hdr, auth); 1299275970Scy free(auth); 1300275970Scy return (r); 1301275970Scy} 1302275970Scy 1303275970Scy/* 1304275970Scy * Chose the challenge to answer and call the appropriate routine to 1305275970Scy * produce the header. 1306275970Scy */ 1307275970Scystatic int 1308275970Scyhttp_authorize(conn_t *conn, const char *hdr, http_auth_challenges_t *cs, 1309275970Scy http_auth_params_t *parms, struct url *url) 1310275970Scy{ 1311275970Scy http_auth_challenge_t *basic = NULL; 1312275970Scy http_auth_challenge_t *digest = NULL; 1313275970Scy int i; 1314275970Scy 1315275970Scy /* If user or pass are null we're not happy */ 1316275970Scy if (!parms->user || !parms->password) { 1317275970Scy DEBUG(fprintf(stderr, "NULL usr or pass\n")); 1318275970Scy return (-1); 1319275970Scy } 1320275970Scy 1321275970Scy /* Look for a Digest and a Basic challenge */ 1322275970Scy for (i = 0; i < cs->count; i++) { 1323275970Scy if (cs->challenges[i]->scheme == HTTPAS_BASIC) 1324275970Scy basic = cs->challenges[i]; 1325275970Scy if (cs->challenges[i]->scheme == HTTPAS_DIGEST) 1326275970Scy digest = cs->challenges[i]; 1327275970Scy } 1328275970Scy 1329275970Scy /* Error if "Digest" was specified and there is no Digest challenge */ 1330275970Scy if (!digest && (parms->scheme && 1331275970Scy !strcasecmp(parms->scheme, "digest"))) { 1332275970Scy DEBUG(fprintf(stderr, 1333275970Scy "Digest auth in env, not supported by peer\n")); 1334275970Scy return (-1); 1335275970Scy } 1336275970Scy /* 1337275970Scy * If "basic" was specified in the environment, or there is no Digest 1338275970Scy * challenge, do the basic thing. Don't need a challenge for this, 1339275970Scy * so no need to check basic!=NULL 1340275970Scy */ 1341275970Scy if (!digest || (parms->scheme && !strcasecmp(parms->scheme,"basic"))) 1342275970Scy return (http_basic_auth(conn,hdr,parms->user,parms->password)); 1343275970Scy 1344275970Scy /* Else, prefer digest. We just checked that it's not NULL */ 1345275970Scy return (http_digest_auth(conn, hdr, digest, parms, url)); 1346275970Scy} 1347275970Scy 1348275970Scy/***************************************************************************** 1349275970Scy * Helper functions for connecting to a server or proxy 1350275970Scy */ 1351275970Scy 1352275970Scy/* 1353275970Scy * Connect to the correct HTTP server or proxy. 1354275970Scy */ 1355275970Scystatic conn_t * 1356275970Scyhttp_connect(struct url *URL, struct url *purl, const char *flags) 1357275970Scy{ 1358275970Scy conn_t *conn; 1359275970Scy int verbose; 1360275970Scy int af, val; 1361275970Scy 1362275970Scy#ifdef INET6 1363275970Scy af = AF_UNSPEC; 1364275970Scy#else 1365275970Scy af = AF_INET; 1366275970Scy#endif 1367275970Scy 1368275970Scy verbose = CHECK_FLAG('v'); 1369275970Scy if (CHECK_FLAG('4')) 1370275970Scy af = AF_INET; 1371275970Scy#ifdef INET6 1372275970Scy else if (CHECK_FLAG('6')) 1373275970Scy af = AF_INET6; 1374275970Scy#endif 1375275970Scy 1376275970Scy if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) { 1377275970Scy URL = purl; 1378275970Scy } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 1379275970Scy /* can't talk http to an ftp server */ 1380275970Scy /* XXX should set an error code */ 1381275970Scy return (NULL); 1382275970Scy } 1383275970Scy 1384275970Scy if ((conn = fetch_connect(URL->host, URL->port, af, verbose)) == NULL) 1385275970Scy /* fetch_connect() has already set an error code */ 1386275970Scy return (NULL); 1387275970Scy if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && 1388275970Scy fetch_ssl(conn, verbose) == -1) { 1389275970Scy fetch_close(conn); 1390275970Scy /* grrr */ 1391275970Scy errno = EAUTH; 1392275970Scy fetch_syserr(); 1393275970Scy return (NULL); 1394275970Scy } 1395275970Scy 1396275970Scy val = 1; 1397275970Scy setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val)); 1398275970Scy 1399275970Scy return (conn); 1400275970Scy} 1401275970Scy 1402275970Scystatic struct url * 1403275970Scyhttp_get_proxy(struct url * url, const char *flags) 1404275970Scy{ 1405275970Scy struct url *purl; 1406275970Scy char *p; 1407275970Scy 1408275970Scy if (flags != NULL && strchr(flags, 'd') != NULL) 1409275970Scy return (NULL); 1410275970Scy if (fetch_no_proxy_match(url->host)) 1411275970Scy return (NULL); 1412275970Scy if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1413275970Scy *p && (purl = fetchParseURL(p))) { 1414275970Scy if (!*purl->scheme) 1415275970Scy strcpy(purl->scheme, SCHEME_HTTP); 1416275970Scy if (!purl->port) 1417275970Scy purl->port = fetch_default_proxy_port(purl->scheme); 1418275970Scy if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 1419275970Scy return (purl); 1420275970Scy fetchFreeURL(purl); 1421275970Scy } 1422275970Scy return (NULL); 1423275970Scy} 1424275970Scy 1425275970Scystatic void 1426275970Scyhttp_print_html(FILE *out, FILE *in) 1427275970Scy{ 1428275970Scy size_t len; 1429275970Scy char *line, *p, *q; 1430275970Scy int comment, tag; 1431275970Scy 1432275970Scy comment = tag = 0; 1433275970Scy while ((line = fgetln(in, &len)) != NULL) { 1434275970Scy while (len && isspace((unsigned char)line[len - 1])) 1435275970Scy --len; 1436275970Scy for (p = q = line; q < line + len; ++q) { 1437275970Scy if (comment && *q == '-') { 1438275970Scy if (q + 2 < line + len && 1439275970Scy strcmp(q, "-->") == 0) { 1440275970Scy tag = comment = 0; 1441275970Scy q += 2; 1442275970Scy } 1443275970Scy } else if (tag && !comment && *q == '>') { 1444275970Scy p = q + 1; 1445275970Scy tag = 0; 1446275970Scy } else if (!tag && *q == '<') { 1447275970Scy if (q > p) 1448275970Scy fwrite(p, q - p, 1, out); 1449275970Scy tag = 1; 1450275970Scy if (q + 3 < line + len && 1451275970Scy strcmp(q, "<!--") == 0) { 1452275970Scy comment = 1; 1453275970Scy q += 3; 1454275970Scy } 1455275970Scy } 1456275970Scy } 1457275970Scy if (!tag && q > p) 1458275970Scy fwrite(p, q - p, 1, out); 1459275970Scy fputc('\n', out); 1460275970Scy } 1461275970Scy} 1462275970Scy 1463275970Scy 1464275970Scy/***************************************************************************** 1465275970Scy * Core 1466275970Scy */ 1467275970Scy 1468275970Scy/* 1469275970Scy * Send a request and process the reply 1470275970Scy * 1471275970Scy * XXX This function is way too long, the do..while loop should be split 1472275970Scy * XXX off into a separate function. 1473275970Scy */ 1474275970ScyFILE * 1475275970Scyhttp_request(struct url *URL, const char *op, struct url_stat *us, 1476275970Scy struct url *purl, const char *flags) 1477275970Scy{ 1478275970Scy char timebuf[80]; 1479275970Scy char hbuf[MAXHOSTNAMELEN + 7], *host; 1480275970Scy conn_t *conn; 1481275970Scy struct url *url, *new; 1482275970Scy int chunked, direct, ims, noredirect, verbose; 1483275970Scy int e, i, n, val; 1484275970Scy off_t offset, clength, length, size; 1485275970Scy time_t mtime; 1486275970Scy const char *p; 1487275970Scy FILE *f; 1488275970Scy hdr_t h; 1489275970Scy struct tm *timestruct; 1490275970Scy http_headerbuf_t headerbuf; 1491275970Scy http_auth_challenges_t server_challenges; 1492275970Scy http_auth_challenges_t proxy_challenges; 1493275970Scy 1494275970Scy /* The following calls don't allocate anything */ 1495275970Scy init_http_headerbuf(&headerbuf); 1496275970Scy init_http_auth_challenges(&server_challenges); 1497275970Scy init_http_auth_challenges(&proxy_challenges); 1498275970Scy 1499275970Scy direct = CHECK_FLAG('d'); 1500275970Scy noredirect = CHECK_FLAG('A'); 1501275970Scy verbose = CHECK_FLAG('v'); 1502275970Scy ims = CHECK_FLAG('i'); 1503275970Scy 1504275970Scy if (direct && purl) { 1505275970Scy fetchFreeURL(purl); 1506275970Scy purl = NULL; 1507275970Scy } 1508275970Scy 1509275970Scy /* try the provided URL first */ 1510275970Scy url = URL; 1511275970Scy 1512275970Scy /* if the A flag is set, we only get one try */ 1513275970Scy n = noredirect ? 1 : MAX_REDIRECT; 1514275970Scy i = 0; 1515275970Scy 1516275970Scy e = HTTP_PROTOCOL_ERROR; 1517275970Scy do { 1518275970Scy new = NULL; 1519275970Scy chunked = 0; 1520275970Scy offset = 0; 1521275970Scy clength = -1; 1522275970Scy length = -1; 1523275970Scy size = -1; 1524275970Scy mtime = 0; 1525275970Scy 1526275970Scy /* check port */ 1527275970Scy if (!url->port) 1528275970Scy url->port = fetch_default_port(url->scheme); 1529275970Scy 1530275970Scy /* were we redirected to an FTP URL? */ 1531275970Scy if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) { 1532275970Scy if (strcmp(op, "GET") == 0) 1533275970Scy return (ftp_request(url, "RETR", us, purl, flags)); 1534275970Scy else if (strcmp(op, "HEAD") == 0) 1535275970Scy return (ftp_request(url, "STAT", us, purl, flags)); 1536275970Scy } 1537275970Scy 1538275970Scy /* connect to server or proxy */ 1539275970Scy if ((conn = http_connect(url, purl, flags)) == NULL) 1540275970Scy goto ouch; 1541275970Scy 1542275970Scy host = url->host; 1543275970Scy#ifdef INET6 1544275970Scy if (strchr(url->host, ':')) { 1545275970Scy snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 1546275970Scy host = hbuf; 1547275970Scy } 1548275970Scy#endif 1549275970Scy if (url->port != fetch_default_port(url->scheme)) { 1550275970Scy if (host != hbuf) { 1551275970Scy strcpy(hbuf, host); 1552275970Scy host = hbuf; 1553275970Scy } 1554275970Scy snprintf(hbuf + strlen(hbuf), 1555275970Scy sizeof(hbuf) - strlen(hbuf), ":%d", url->port); 1556275970Scy } 1557275970Scy 1558275970Scy /* send request */ 1559275970Scy if (verbose) 1560275970Scy fetch_info("requesting %s://%s%s", 1561275970Scy url->scheme, host, url->doc); 1562275970Scy if (purl) { 1563275970Scy http_cmd(conn, "%s %s://%s%s HTTP/1.1", 1564275970Scy op, url->scheme, host, url->doc); 1565275970Scy } else { 1566275970Scy http_cmd(conn, "%s %s HTTP/1.1", 1567275970Scy op, url->doc); 1568275970Scy } 1569275970Scy 1570275970Scy if (ims && url->ims_time) { 1571275970Scy timestruct = gmtime((time_t *)&url->ims_time); 1572275970Scy (void)strftime(timebuf, 80, "%a, %d %b %Y %T GMT", 1573275970Scy timestruct); 1574275970Scy if (verbose) 1575275970Scy fetch_info("If-Modified-Since: %s", timebuf); 1576275970Scy http_cmd(conn, "If-Modified-Since: %s", timebuf); 1577275970Scy } 1578275970Scy /* virtual host */ 1579275970Scy http_cmd(conn, "Host: %s", host); 1580275970Scy 1581275970Scy /* 1582275970Scy * Proxy authorization: we only send auth after we received 1583275970Scy * a 407 error. We do not first try basic anyway (changed 1584275970Scy * when support was added for digest-auth) 1585275970Scy */ 1586275970Scy if (purl && proxy_challenges.valid) { 1587275970Scy http_auth_params_t aparams; 1588275970Scy init_http_auth_params(&aparams); 1589275970Scy if (*purl->user || *purl->pwd) { 1590275970Scy aparams.user = purl->user ? 1591275970Scy strdup(purl->user) : strdup(""); 1592275970Scy aparams.password = purl->pwd? 1593275970Scy strdup(purl->pwd) : strdup(""); 1594275970Scy } else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && 1595275970Scy *p != '\0') { 1596275970Scy if (http_authfromenv(p, &aparams) < 0) { 1597275970Scy http_seterr(HTTP_NEED_PROXY_AUTH); 1598275970Scy goto ouch; 1599275970Scy } 1600275970Scy } 1601275970Scy http_authorize(conn, "Proxy-Authorization", 1602275970Scy &proxy_challenges, &aparams, url); 1603275970Scy clean_http_auth_params(&aparams); 1604275970Scy } 1605275970Scy 1606275970Scy /* 1607275970Scy * Server authorization: we never send "a priori" 1608275970Scy * Basic auth, which used to be done if user/pass were 1609275970Scy * set in the url. This would be weird because we'd send the 1610275970Scy * password in the clear even if Digest is finally to be 1611275970Scy * used (it would have made more sense for the 1612275970Scy * pre-digest version to do this when Basic was specified 1613275970Scy * in the environment) 1614275970Scy */ 1615275970Scy if (server_challenges.valid) { 1616275970Scy http_auth_params_t aparams; 1617275970Scy init_http_auth_params(&aparams); 1618275970Scy if (*url->user || *url->pwd) { 1619275970Scy aparams.user = url->user ? 1620275970Scy strdup(url->user) : strdup(""); 1621275970Scy aparams.password = url->pwd ? 1622275970Scy strdup(url->pwd) : strdup(""); 1623275970Scy } else if ((p = getenv("HTTP_AUTH")) != NULL && 1624275970Scy *p != '\0') { 1625275970Scy if (http_authfromenv(p, &aparams) < 0) { 1626275970Scy http_seterr(HTTP_NEED_AUTH); 1627275970Scy goto ouch; 1628275970Scy } 1629275970Scy } else if (fetchAuthMethod && 1630275970Scy fetchAuthMethod(url) == 0) { 1631275970Scy aparams.user = url->user ? 1632275970Scy strdup(url->user) : strdup(""); 1633275970Scy aparams.password = url->pwd ? 1634275970Scy strdup(url->pwd) : strdup(""); 1635275970Scy } else { 1636275970Scy http_seterr(HTTP_NEED_AUTH); 1637275970Scy goto ouch; 1638275970Scy } 1639275970Scy http_authorize(conn, "Authorization", 1640275970Scy &server_challenges, &aparams, url); 1641275970Scy clean_http_auth_params(&aparams); 1642275970Scy } 1643275970Scy 1644275970Scy /* other headers */ 1645275970Scy if ((p = getenv("HTTP_REFERER")) != NULL && *p != '\0') { 1646275970Scy if (strcasecmp(p, "auto") == 0) 1647275970Scy http_cmd(conn, "Referer: %s://%s%s", 1648275970Scy url->scheme, host, url->doc); 1649275970Scy else 1650275970Scy http_cmd(conn, "Referer: %s", p); 1651275970Scy } 1652275970Scy if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0') 1653275970Scy http_cmd(conn, "User-Agent: %s", p); 1654275970Scy else 1655275970Scy http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname()); 1656275970Scy if (url->offset > 0) 1657275970Scy http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset); 1658275970Scy http_cmd(conn, "Connection: close"); 1659275970Scy http_cmd(conn, ""); 1660275970Scy 1661275970Scy /* 1662275970Scy * Force the queued request to be dispatched. Normally, one 1663275970Scy * would do this with shutdown(2) but squid proxies can be 1664275970Scy * configured to disallow such half-closed connections. To 1665275970Scy * be compatible with such configurations, fiddle with socket 1666275970Scy * options to force the pending data to be written. 1667275970Scy */ 1668275970Scy val = 0; 1669275970Scy setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, 1670275970Scy sizeof(val)); 1671275970Scy val = 1; 1672275970Scy setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val, 1673275970Scy sizeof(val)); 1674275970Scy 1675275970Scy /* get reply */ 1676275970Scy switch (http_get_reply(conn)) { 1677275970Scy case HTTP_OK: 1678275970Scy case HTTP_PARTIAL: 1679275970Scy case HTTP_NOT_MODIFIED: 1680275970Scy /* fine */ 1681275970Scy break; 1682275970Scy case HTTP_MOVED_PERM: 1683275970Scy case HTTP_MOVED_TEMP: 1684275970Scy case HTTP_SEE_OTHER: 1685275970Scy /* 1686275970Scy * Not so fine, but we still have to read the 1687275970Scy * headers to get the new location. 1688275970Scy */ 1689275970Scy break; 1690275970Scy case HTTP_NEED_AUTH: 1691275970Scy if (server_challenges.valid) { 1692275970Scy /* 1693275970Scy * We already sent out authorization code, 1694275970Scy * so there's nothing more we can do. 1695275970Scy */ 1696275970Scy http_seterr(conn->err); 1697275970Scy goto ouch; 1698275970Scy } 1699275970Scy /* try again, but send the password this time */ 1700275970Scy if (verbose) 1701275970Scy fetch_info("server requires authorization"); 1702275970Scy break; 1703275970Scy case HTTP_NEED_PROXY_AUTH: 1704275970Scy if (proxy_challenges.valid) { 1705275970Scy /* 1706275970Scy * We already sent our proxy 1707275970Scy * authorization code, so there's 1708275970Scy * nothing more we can do. */ 1709275970Scy http_seterr(conn->err); 1710275970Scy goto ouch; 1711275970Scy } 1712275970Scy /* try again, but send the password this time */ 1713275970Scy if (verbose) 1714275970Scy fetch_info("proxy requires authorization"); 1715275970Scy break; 1716275970Scy case HTTP_BAD_RANGE: 1717275970Scy /* 1718275970Scy * This can happen if we ask for 0 bytes because 1719275970Scy * we already have the whole file. Consider this 1720275970Scy * a success for now, and check sizes later. 1721275970Scy */ 1722275970Scy break; 1723275970Scy case HTTP_PROTOCOL_ERROR: 1724275970Scy /* fall through */ 1725275970Scy case -1: 1726275970Scy fetch_syserr(); 1727275970Scy goto ouch; 1728275970Scy default: 1729275970Scy http_seterr(conn->err); 1730275970Scy if (!verbose) 1731275970Scy goto ouch; 1732275970Scy /* fall through so we can get the full error message */ 1733275970Scy } 1734275970Scy 1735275970Scy /* get headers. http_next_header expects one line readahead */ 1736275970Scy if (fetch_getln(conn) == -1) { 1737275970Scy fetch_syserr(); 1738275970Scy goto ouch; 1739275970Scy } 1740275970Scy do { 1741275970Scy switch ((h = http_next_header(conn, &headerbuf, &p))) { 1742275970Scy case hdr_syserror: 1743275970Scy fetch_syserr(); 1744275970Scy goto ouch; 1745275970Scy case hdr_error: 1746275970Scy http_seterr(HTTP_PROTOCOL_ERROR); 1747275970Scy goto ouch; 1748275970Scy case hdr_content_length: 1749275970Scy http_parse_length(p, &clength); 1750275970Scy break; 1751275970Scy case hdr_content_range: 1752275970Scy http_parse_range(p, &offset, &length, &size); 1753275970Scy break; 1754275970Scy case hdr_last_modified: 1755275970Scy http_parse_mtime(p, &mtime); 1756275970Scy break; 1757275970Scy case hdr_location: 1758275970Scy if (!HTTP_REDIRECT(conn->err)) 1759275970Scy break; 1760275970Scy if (new) 1761275970Scy free(new); 1762275970Scy if (verbose) 1763275970Scy fetch_info("%d redirect to %s", conn->err, p); 1764275970Scy if (*p == '/') 1765275970Scy /* absolute path */ 1766275970Scy new = fetchMakeURL(url->scheme, url->host, url->port, p, 1767275970Scy url->user, url->pwd); 1768275970Scy else 1769275970Scy new = fetchParseURL(p); 1770275970Scy if (new == NULL) { 1771275970Scy /* XXX should set an error code */ 1772275970Scy DEBUG(fprintf(stderr, "failed to parse new URL\n")); 1773275970Scy goto ouch; 1774275970Scy } 1775275970Scy if (!*new->user && !*new->pwd) { 1776275970Scy strcpy(new->user, url->user); 1777275970Scy strcpy(new->pwd, url->pwd); 1778275970Scy } 1779275970Scy new->offset = url->offset; 1780275970Scy new->length = url->length; 1781275970Scy break; 1782275970Scy case hdr_transfer_encoding: 1783275970Scy /* XXX weak test*/ 1784275970Scy chunked = (strcasecmp(p, "chunked") == 0); 1785275970Scy break; 1786275970Scy case hdr_www_authenticate: 1787275970Scy if (conn->err != HTTP_NEED_AUTH) 1788275970Scy break; 1789275970Scy if (http_parse_authenticate(p, &server_challenges) == 0) 1790275970Scy ++n; 1791275970Scy break; 1792275970Scy case hdr_proxy_authenticate: 1793275970Scy if (conn->err != HTTP_NEED_PROXY_AUTH) 1794275970Scy break; 1795275970Scy if (http_parse_authenticate(p, &proxy_challenges) == 0) 1796275970Scy ++n; 1797275970Scy break; 1798275970Scy case hdr_end: 1799275970Scy /* fall through */ 1800275970Scy case hdr_unknown: 1801275970Scy /* ignore */ 1802275970Scy break; 1803275970Scy } 1804275970Scy } while (h > hdr_end); 1805275970Scy 1806 /* we need to provide authentication */ 1807 if (conn->err == HTTP_NEED_AUTH || 1808 conn->err == HTTP_NEED_PROXY_AUTH) { 1809 e = conn->err; 1810 if ((conn->err == HTTP_NEED_AUTH && 1811 !server_challenges.valid) || 1812 (conn->err == HTTP_NEED_PROXY_AUTH && 1813 !proxy_challenges.valid)) { 1814 /* 401/7 but no www/proxy-authenticate ?? */ 1815 DEBUG(fprintf(stderr, "401/7 and no auth header\n")); 1816 goto ouch; 1817 } 1818 fetch_close(conn); 1819 conn = NULL; 1820 continue; 1821 } 1822 1823 /* requested range not satisfiable */ 1824 if (conn->err == HTTP_BAD_RANGE) { 1825 if (url->offset == size && url->length == 0) { 1826 /* asked for 0 bytes; fake it */ 1827 offset = url->offset; 1828 clength = -1; 1829 conn->err = HTTP_OK; 1830 break; 1831 } else { 1832 http_seterr(conn->err); 1833 goto ouch; 1834 } 1835 } 1836 1837 /* we have a hit or an error */ 1838 if (conn->err == HTTP_OK 1839 || conn->err == HTTP_NOT_MODIFIED 1840 || conn->err == HTTP_PARTIAL 1841 || HTTP_ERROR(conn->err)) 1842 break; 1843 1844 /* all other cases: we got a redirect */ 1845 e = conn->err; 1846 clean_http_auth_challenges(&server_challenges); 1847 fetch_close(conn); 1848 conn = NULL; 1849 if (!new) { 1850 DEBUG(fprintf(stderr, "redirect with no new location\n")); 1851 break; 1852 } 1853 if (url != URL) 1854 fetchFreeURL(url); 1855 url = new; 1856 } while (++i < n); 1857 1858 /* we failed, or ran out of retries */ 1859 if (conn == NULL) { 1860 http_seterr(e); 1861 goto ouch; 1862 } 1863 1864 DEBUG(fprintf(stderr, "offset %lld, length %lld," 1865 " size %lld, clength %lld\n", 1866 (long long)offset, (long long)length, 1867 (long long)size, (long long)clength)); 1868 1869 if (conn->err == HTTP_NOT_MODIFIED) { 1870 http_seterr(HTTP_NOT_MODIFIED); 1871 return (NULL); 1872 } 1873 1874 /* check for inconsistencies */ 1875 if (clength != -1 && length != -1 && clength != length) { 1876 http_seterr(HTTP_PROTOCOL_ERROR); 1877 goto ouch; 1878 } 1879 if (clength == -1) 1880 clength = length; 1881 if (clength != -1) 1882 length = offset + clength; 1883 if (length != -1 && size != -1 && length != size) { 1884 http_seterr(HTTP_PROTOCOL_ERROR); 1885 goto ouch; 1886 } 1887 if (size == -1) 1888 size = length; 1889 1890 /* fill in stats */ 1891 if (us) { 1892 us->size = size; 1893 us->atime = us->mtime = mtime; 1894 } 1895 1896 /* too far? */ 1897 if (URL->offset > 0 && offset > URL->offset) { 1898 http_seterr(HTTP_PROTOCOL_ERROR); 1899 goto ouch; 1900 } 1901 1902 /* report back real offset and size */ 1903 URL->offset = offset; 1904 URL->length = clength; 1905 1906 /* wrap it up in a FILE */ 1907 if ((f = http_funopen(conn, chunked)) == NULL) { 1908 fetch_syserr(); 1909 goto ouch; 1910 } 1911 1912 if (url != URL) 1913 fetchFreeURL(url); 1914 if (purl) 1915 fetchFreeURL(purl); 1916 1917 if (HTTP_ERROR(conn->err)) { 1918 http_print_html(stderr, f); 1919 fclose(f); 1920 f = NULL; 1921 } 1922 clean_http_headerbuf(&headerbuf); 1923 clean_http_auth_challenges(&server_challenges); 1924 clean_http_auth_challenges(&proxy_challenges); 1925 return (f); 1926 1927ouch: 1928 if (url != URL) 1929 fetchFreeURL(url); 1930 if (purl) 1931 fetchFreeURL(purl); 1932 if (conn != NULL) 1933 fetch_close(conn); 1934 clean_http_headerbuf(&headerbuf); 1935 clean_http_auth_challenges(&server_challenges); 1936 clean_http_auth_challenges(&proxy_challenges); 1937 return (NULL); 1938} 1939 1940 1941/***************************************************************************** 1942 * Entry points 1943 */ 1944 1945/* 1946 * Retrieve and stat a file by HTTP 1947 */ 1948FILE * 1949fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags) 1950{ 1951 return (http_request(URL, "GET", us, http_get_proxy(URL, flags), flags)); 1952} 1953 1954/* 1955 * Retrieve a file by HTTP 1956 */ 1957FILE * 1958fetchGetHTTP(struct url *URL, const char *flags) 1959{ 1960 return (fetchXGetHTTP(URL, NULL, flags)); 1961} 1962 1963/* 1964 * Store a file by HTTP 1965 */ 1966FILE * 1967fetchPutHTTP(struct url *URL __unused, const char *flags __unused) 1968{ 1969 warnx("fetchPutHTTP(): not implemented"); 1970 return (NULL); 1971} 1972 1973/* 1974 * Get an HTTP document's metadata 1975 */ 1976int 1977fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags) 1978{ 1979 FILE *f; 1980 1981 f = http_request(URL, "HEAD", us, http_get_proxy(URL, flags), flags); 1982 if (f == NULL) 1983 return (-1); 1984 fclose(f); 1985 return (0); 1986} 1987 1988/* 1989 * List a directory 1990 */ 1991struct url_ent * 1992fetchListHTTP(struct url *url __unused, const char *flags __unused) 1993{ 1994 warnx("fetchListHTTP(): not implemented"); 1995 return (NULL); 1996} 1997