http.c revision 241840
137535Sdes/*- 2226537Sdes * Copyright (c) 2000-2011 Dag-Erling Sm��rgrav 337535Sdes * All rights reserved. 437535Sdes * 537535Sdes * Redistribution and use in source and binary forms, with or without 637535Sdes * modification, are permitted provided that the following conditions 737535Sdes * are met: 837535Sdes * 1. Redistributions of source code must retain the above copyright 937535Sdes * notice, this list of conditions and the following disclaimer 1037535Sdes * in this position and unchanged. 1137535Sdes * 2. Redistributions in binary form must reproduce the above copyright 1237535Sdes * notice, this list of conditions and the following disclaimer in the 1337535Sdes * documentation and/or other materials provided with the distribution. 1437535Sdes * 3. The name of the author may not be used to endorse or promote products 1563012Sdes * derived from this software without specific prior written permission. 1637535Sdes * 1737535Sdes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1837535Sdes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1937535Sdes * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 2037535Sdes * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 2137535Sdes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2237535Sdes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2337535Sdes * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2437535Sdes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2537535Sdes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2637535Sdes * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2737535Sdes */ 2837535Sdes 2984203Sdillon#include <sys/cdefs.h> 3084203Sdillon__FBSDID("$FreeBSD: head/lib/libfetch/http.c 241840 2012-10-22 03:00:10Z eadler $"); 3184203Sdillon 3263236Sdes/* 3363236Sdes * The following copyright applies to the base64 code: 3463236Sdes * 3563236Sdes *- 3663236Sdes * Copyright 1997 Massachusetts Institute of Technology 3763236Sdes * 3863236Sdes * Permission to use, copy, modify, and distribute this software and 3963236Sdes * its documentation for any purpose and without fee is hereby 4063236Sdes * granted, provided that both the above copyright notice and this 4163236Sdes * permission notice appear in all copies, that both the above 4263236Sdes * copyright notice and this permission notice appear in all 4363236Sdes * supporting documentation, and that the name of M.I.T. not be used 4463236Sdes * in advertising or publicity pertaining to distribution of the 4563236Sdes * software without specific, written prior permission. M.I.T. makes 4663236Sdes * no representations about the suitability of this software for any 4763236Sdes * purpose. It is provided "as is" without express or implied 4863236Sdes * warranty. 4990267Sdes * 5063236Sdes * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 5163236Sdes * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 5263236Sdes * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 5363236Sdes * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 5463236Sdes * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 5563236Sdes * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 5663236Sdes * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 5763236Sdes * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 5863236Sdes * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 5963236Sdes * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 6063236Sdes * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 6163236Sdes * SUCH DAMAGE. 6263236Sdes */ 6363236Sdes 6437535Sdes#include <sys/param.h> 6560737Sume#include <sys/socket.h> 66186124Smurray#include <sys/time.h> 6737535Sdes 6863012Sdes#include <ctype.h> 6937535Sdes#include <err.h> 7063012Sdes#include <errno.h> 7160376Sdes#include <locale.h> 7260189Sdes#include <netdb.h> 7337608Sdes#include <stdarg.h> 7437535Sdes#include <stdio.h> 7537535Sdes#include <stdlib.h> 7637535Sdes#include <string.h> 7760376Sdes#include <time.h> 7837535Sdes#include <unistd.h> 79240496Sdes 80240496Sdes#ifdef WITH_SSL 81240496Sdes#include <openssl/md5.h> 82240496Sdes#define MD5Init(c) MD5_Init(c) 83240496Sdes#define MD5Update(c, data, len) MD5_Update(c, data, len) 84240496Sdes#define MD5Final(md, c) MD5_Final(md, c) 85240496Sdes#else 86202613Sdes#include <md5.h> 87240496Sdes#endif 8837535Sdes 89141958Skbyanc#include <netinet/in.h> 90141958Skbyanc#include <netinet/tcp.h> 91141958Skbyanc 9237535Sdes#include "fetch.h" 9340939Sdes#include "common.h" 9441862Sdes#include "httperr.h" 9537535Sdes 9663012Sdes/* Maximum number of redirects to follow */ 97241839Seadler#define MAX_REDIRECT 20 9837535Sdes 9963012Sdes/* Symbolic names for reply codes we care about */ 10063012Sdes#define HTTP_OK 200 10163012Sdes#define HTTP_PARTIAL 206 10263012Sdes#define HTTP_MOVED_PERM 301 10363012Sdes#define HTTP_MOVED_TEMP 302 10463012Sdes#define HTTP_SEE_OTHER 303 105186124Smurray#define HTTP_NOT_MODIFIED 304 106169386Sdes#define HTTP_TEMP_REDIRECT 307 107241840Seadler#define HTTP_PERM_REDIRECT 308 10863012Sdes#define HTTP_NEED_AUTH 401 10987317Sdes#define HTTP_NEED_PROXY_AUTH 407 110125696Sdes#define HTTP_BAD_RANGE 416 11163012Sdes#define HTTP_PROTOCOL_ERROR 999 11260196Sdes 11363012Sdes#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ 11490267Sdes || (xyz) == HTTP_MOVED_TEMP \ 115169386Sdes || (xyz) == HTTP_TEMP_REDIRECT \ 11690267Sdes || (xyz) == HTTP_SEE_OTHER) 11763012Sdes 11888771Sdes#define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599) 11963012Sdes 12090267Sdes 12163012Sdes/***************************************************************************** 12263012Sdes * I/O functions for decoding chunked streams 12363012Sdes */ 12463012Sdes 12597859Sdesstruct httpio 12637535Sdes{ 12797858Sdes conn_t *conn; /* connection */ 12897866Sdes int chunked; /* chunked mode */ 12997858Sdes char *buf; /* chunk buffer */ 13097866Sdes size_t bufsize; /* size of chunk buffer */ 13197866Sdes ssize_t buflen; /* amount of data currently in buffer */ 13297866Sdes int bufpos; /* current read offset in buffer */ 13397858Sdes int eof; /* end-of-file flag */ 13497858Sdes int error; /* error flag */ 13597858Sdes size_t chunksize; /* remaining size of current chunk */ 13663281Sdes#ifndef NDEBUG 13790267Sdes size_t total; 13863012Sdes#endif 13937535Sdes}; 14037535Sdes 14137608Sdes/* 14263012Sdes * Get next chunk header 14337608Sdes */ 14437608Sdesstatic int 145174588Sdeshttp_new_chunk(struct httpio *io) 14637608Sdes{ 14790267Sdes char *p; 14890267Sdes 149174588Sdes if (fetch_getln(io->conn) == -1) 15090267Sdes return (-1); 15190267Sdes 152174761Sdes if (io->conn->buflen < 2 || !isxdigit((unsigned char)*io->conn->buf)) 15390267Sdes return (-1); 15490267Sdes 155174761Sdes for (p = io->conn->buf; *p && !isspace((unsigned char)*p); ++p) { 15690267Sdes if (*p == ';') 15790267Sdes break; 158174761Sdes if (!isxdigit((unsigned char)*p)) 15990267Sdes return (-1); 160174761Sdes if (isdigit((unsigned char)*p)) { 16197859Sdes io->chunksize = io->chunksize * 16 + 16290267Sdes *p - '0'; 16390267Sdes } else { 16497859Sdes io->chunksize = io->chunksize * 16 + 165176036Sdes 10 + tolower((unsigned char)*p) - 'a'; 16690267Sdes } 16790267Sdes } 16890267Sdes 16963281Sdes#ifndef NDEBUG 17090267Sdes if (fetchDebug) { 17197859Sdes io->total += io->chunksize; 17297859Sdes if (io->chunksize == 0) 173106207Sdes fprintf(stderr, "%s(): end of last chunk\n", __func__); 17490267Sdes else 175106207Sdes fprintf(stderr, "%s(): new chunk: %lu (%lu)\n", 176106207Sdes __func__, (unsigned long)io->chunksize, 177106207Sdes (unsigned long)io->total); 17890267Sdes } 17963012Sdes#endif 18090267Sdes 18197859Sdes return (io->chunksize); 18237608Sdes} 18337608Sdes 18437608Sdes/* 18597866Sdes * Grow the input buffer to at least len bytes 18697866Sdes */ 18797866Sdesstatic inline int 188174588Sdeshttp_growbuf(struct httpio *io, size_t len) 18997866Sdes{ 19097866Sdes char *tmp; 19197866Sdes 19297866Sdes if (io->bufsize >= len) 19397866Sdes return (0); 19497866Sdes 19597866Sdes if ((tmp = realloc(io->buf, len)) == NULL) 19697866Sdes return (-1); 19797866Sdes io->buf = tmp; 19897866Sdes io->bufsize = len; 199106044Sdes return (0); 20097866Sdes} 20197866Sdes 20297866Sdes/* 20337608Sdes * Fill the input buffer, do chunk decoding on the fly 20437608Sdes */ 20563012Sdesstatic int 206174588Sdeshttp_fillbuf(struct httpio *io, size_t len) 20737535Sdes{ 208230307Sdes ssize_t nbytes; 209230307Sdes 21097859Sdes if (io->error) 21190267Sdes return (-1); 21297859Sdes if (io->eof) 21390267Sdes return (0); 21490267Sdes 21597866Sdes if (io->chunked == 0) { 216174588Sdes if (http_growbuf(io, len) == -1) 21797866Sdes return (-1); 218230307Sdes if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) { 219230307Sdes io->error = errno; 22097866Sdes return (-1); 221106185Sdes } 222230307Sdes io->buflen = nbytes; 22397866Sdes io->bufpos = 0; 22497866Sdes return (io->buflen); 22597866Sdes } 22697866Sdes 22797859Sdes if (io->chunksize == 0) { 228174588Sdes switch (http_new_chunk(io)) { 22990267Sdes case -1: 23097859Sdes io->error = 1; 23190267Sdes return (-1); 23290267Sdes case 0: 23397859Sdes io->eof = 1; 23490267Sdes return (0); 23590267Sdes } 23637535Sdes } 23763012Sdes 23897866Sdes if (len > io->chunksize) 23997866Sdes len = io->chunksize; 240174588Sdes if (http_growbuf(io, len) == -1) 24190267Sdes return (-1); 242230307Sdes if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) { 243230307Sdes io->error = errno; 24497866Sdes return (-1); 245106185Sdes } 246230307Sdes io->buflen = nbytes; 24797866Sdes io->chunksize -= io->buflen; 24890267Sdes 24997859Sdes if (io->chunksize == 0) { 25097856Sdes char endl[2]; 25197856Sdes 252174588Sdes if (fetch_read(io->conn, endl, 2) != 2 || 25397856Sdes endl[0] != '\r' || endl[1] != '\n') 25490267Sdes return (-1); 25590267Sdes } 25690267Sdes 25797866Sdes io->bufpos = 0; 25890267Sdes 25997866Sdes return (io->buflen); 26037535Sdes} 26137535Sdes 26237608Sdes/* 26337608Sdes * Read function 26437608Sdes */ 26537535Sdesstatic int 266174588Sdeshttp_readfn(void *v, char *buf, int len) 26737535Sdes{ 26897859Sdes struct httpio *io = (struct httpio *)v; 26990267Sdes int l, pos; 27063012Sdes 27197859Sdes if (io->error) 27290267Sdes return (-1); 27397859Sdes if (io->eof) 27490267Sdes return (0); 27563012Sdes 27690267Sdes for (pos = 0; len > 0; pos += l, len -= l) { 27790267Sdes /* empty buffer */ 27897866Sdes if (!io->buf || io->bufpos == io->buflen) 279174588Sdes if (http_fillbuf(io, len) < 1) 28090267Sdes break; 28197866Sdes l = io->buflen - io->bufpos; 28290267Sdes if (len < l) 28390267Sdes l = len; 284176105Sdes memcpy(buf + pos, io->buf + io->bufpos, l); 28597866Sdes io->bufpos += l; 28690267Sdes } 28737535Sdes 288230307Sdes if (!pos && io->error) { 289230307Sdes if (io->error == EINTR) 290230307Sdes io->error = 0; 29190267Sdes return (-1); 292230307Sdes } 29390267Sdes return (pos); 29437535Sdes} 29537535Sdes 29637608Sdes/* 29737608Sdes * Write function 29837608Sdes */ 29937535Sdesstatic int 300174588Sdeshttp_writefn(void *v, const char *buf, int len) 30137535Sdes{ 30297859Sdes struct httpio *io = (struct httpio *)v; 30390267Sdes 304174588Sdes return (fetch_write(io->conn, buf, len)); 30537535Sdes} 30637535Sdes 30737608Sdes/* 30837608Sdes * Close function 30937608Sdes */ 31037535Sdesstatic int 311174588Sdeshttp_closefn(void *v) 31237535Sdes{ 31397859Sdes struct httpio *io = (struct httpio *)v; 31490267Sdes int r; 31563012Sdes 316174588Sdes r = fetch_close(io->conn); 31797859Sdes if (io->buf) 31897859Sdes free(io->buf); 31997859Sdes free(io); 32090267Sdes return (r); 32137535Sdes} 32237535Sdes 32337608Sdes/* 32463012Sdes * Wrap a file descriptor up 32537608Sdes */ 32663012Sdesstatic FILE * 327174588Sdeshttp_funopen(conn_t *conn, int chunked) 32837535Sdes{ 32997859Sdes struct httpio *io; 33090267Sdes FILE *f; 33163012Sdes 332109967Sdes if ((io = calloc(1, sizeof(*io))) == NULL) { 333174588Sdes fetch_syserr(); 33490267Sdes return (NULL); 33590267Sdes } 33697859Sdes io->conn = conn; 33797866Sdes io->chunked = chunked; 338174588Sdes f = funopen(io, http_readfn, http_writefn, NULL, http_closefn); 33990267Sdes if (f == NULL) { 340174588Sdes fetch_syserr(); 34197859Sdes free(io); 34290267Sdes return (NULL); 34390267Sdes } 34490267Sdes return (f); 34563012Sdes} 34663012Sdes 34790267Sdes 34863012Sdes/***************************************************************************** 34963012Sdes * Helper functions for talking to the server and parsing its replies 35063012Sdes */ 35163012Sdes 35263012Sdes/* Header types */ 35363012Sdestypedef enum { 35490267Sdes hdr_syserror = -2, 35590267Sdes hdr_error = -1, 35690267Sdes hdr_end = 0, 35790267Sdes hdr_unknown = 1, 35890267Sdes hdr_content_length, 35990267Sdes hdr_content_range, 36090267Sdes hdr_last_modified, 36190267Sdes hdr_location, 36290267Sdes hdr_transfer_encoding, 363202613Sdes hdr_www_authenticate, 364202613Sdes hdr_proxy_authenticate, 36585093Sdes} hdr_t; 36663012Sdes 36763012Sdes/* Names of interesting headers */ 36863012Sdesstatic struct { 36990267Sdes hdr_t num; 37090267Sdes const char *name; 37163012Sdes} hdr_names[] = { 37290267Sdes { hdr_content_length, "Content-Length" }, 37390267Sdes { hdr_content_range, "Content-Range" }, 37490267Sdes { hdr_last_modified, "Last-Modified" }, 37590267Sdes { hdr_location, "Location" }, 37690267Sdes { hdr_transfer_encoding, "Transfer-Encoding" }, 37790267Sdes { hdr_www_authenticate, "WWW-Authenticate" }, 378202613Sdes { hdr_proxy_authenticate, "Proxy-Authenticate" }, 37990267Sdes { hdr_unknown, NULL }, 38063012Sdes}; 38163012Sdes 38263012Sdes/* 38363012Sdes * Send a formatted line; optionally echo to terminal 38463012Sdes */ 38563012Sdesstatic int 386174588Sdeshttp_cmd(conn_t *conn, const char *fmt, ...) 38763012Sdes{ 38890267Sdes va_list ap; 38990267Sdes size_t len; 39090267Sdes char *msg; 39190267Sdes int r; 39263012Sdes 39390267Sdes va_start(ap, fmt); 39490267Sdes len = vasprintf(&msg, fmt, ap); 39590267Sdes va_end(ap); 39690267Sdes 39790267Sdes if (msg == NULL) { 39890267Sdes errno = ENOMEM; 399174588Sdes fetch_syserr(); 40090267Sdes return (-1); 40190267Sdes } 40290267Sdes 403174588Sdes r = fetch_putln(conn, msg, len); 40490267Sdes free(msg); 40590267Sdes 40690267Sdes if (r == -1) { 407174588Sdes fetch_syserr(); 40890267Sdes return (-1); 40990267Sdes } 41090267Sdes 41190267Sdes return (0); 41263012Sdes} 41363012Sdes 41463012Sdes/* 41563012Sdes * Get and parse status line 41663012Sdes */ 41763012Sdesstatic int 418174588Sdeshttp_get_reply(conn_t *conn) 41963012Sdes{ 42090267Sdes char *p; 42190267Sdes 422174588Sdes if (fetch_getln(conn) == -1) 42390267Sdes return (-1); 42490267Sdes /* 42590267Sdes * A valid status line looks like "HTTP/m.n xyz reason" where m 42690267Sdes * and n are the major and minor protocol version numbers and xyz 42790267Sdes * is the reply code. 42890267Sdes * Unfortunately, there are servers out there (NCSA 1.5.1, to name 42990267Sdes * just one) that do not send a version number, so we can't rely 43090267Sdes * on finding one, but if we do, insist on it being 1.0 or 1.1. 43190267Sdes * We don't care about the reason phrase. 43290267Sdes */ 43397856Sdes if (strncmp(conn->buf, "HTTP", 4) != 0) 43490267Sdes return (HTTP_PROTOCOL_ERROR); 43597856Sdes p = conn->buf + 4; 43690267Sdes if (*p == '/') { 43790267Sdes if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) 43890267Sdes return (HTTP_PROTOCOL_ERROR); 43990267Sdes p += 4; 44090267Sdes } 441174761Sdes if (*p != ' ' || 442174761Sdes !isdigit((unsigned char)p[1]) || 443174761Sdes !isdigit((unsigned char)p[2]) || 444174761Sdes !isdigit((unsigned char)p[3])) 44590267Sdes return (HTTP_PROTOCOL_ERROR); 44690267Sdes 44797856Sdes conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'); 44897856Sdes return (conn->err); 44937535Sdes} 45037535Sdes 45137608Sdes/* 45290267Sdes * Check a header; if the type matches the given string, return a pointer 45390267Sdes * to the beginning of the value. 45463012Sdes */ 45575891Sarchiestatic const char * 456174588Sdeshttp_match(const char *str, const char *hdr) 45763012Sdes{ 458176036Sdes while (*str && *hdr && 459176036Sdes tolower((unsigned char)*str++) == tolower((unsigned char)*hdr++)) 46090267Sdes /* nothing */; 46190267Sdes if (*str || *hdr != ':') 46290267Sdes return (NULL); 463174761Sdes while (*hdr && isspace((unsigned char)*++hdr)) 46490267Sdes /* nothing */; 46590267Sdes return (hdr); 46663012Sdes} 46763012Sdes 468202613Sdes 46963012Sdes/* 470202613Sdes * Get the next header and return the appropriate symbolic code. We 471202613Sdes * need to read one line ahead for checking for a continuation line 472202613Sdes * belonging to the current header (continuation lines start with 473221821Sdes * white space). 474202613Sdes * 475202613Sdes * We get called with a fresh line already in the conn buffer, either 476202613Sdes * from the previous http_next_header() invocation, or, the first 477202613Sdes * time, from a fetch_getln() performed by our caller. 478202613Sdes * 479202613Sdes * This stops when we encounter an empty line (we dont read beyond the header 480202613Sdes * area). 481221821Sdes * 482202613Sdes * Note that the "headerbuf" is just a place to return the result. Its 483202613Sdes * contents are not used for the next call. This means that no cleanup 484202613Sdes * is needed when ie doing another connection, just call the cleanup when 485202613Sdes * fully done to deallocate memory. 48663012Sdes */ 487202613Sdes 488202613Sdes/* Limit the max number of continuation lines to some reasonable value */ 489202613Sdes#define HTTP_MAX_CONT_LINES 10 490202613Sdes 491202613Sdes/* Place into which to build a header from one or several lines */ 492202613Sdestypedef struct { 493202613Sdes char *buf; /* buffer */ 494202613Sdes size_t bufsize; /* buffer size */ 495202613Sdes size_t buflen; /* length of buffer contents */ 496202613Sdes} http_headerbuf_t; 497202613Sdes 498202613Sdesstatic void 499202613Sdesinit_http_headerbuf(http_headerbuf_t *buf) 50063012Sdes{ 501202613Sdes buf->buf = NULL; 502202613Sdes buf->bufsize = 0; 503202613Sdes buf->buflen = 0; 504202613Sdes} 50590267Sdes 506221821Sdesstatic void 507202613Sdesclean_http_headerbuf(http_headerbuf_t *buf) 508202613Sdes{ 509202613Sdes if (buf->buf) 510202613Sdes free(buf->buf); 511202613Sdes init_http_headerbuf(buf); 512202613Sdes} 513202613Sdes 514202613Sdes/* Remove whitespace at the end of the buffer */ 515221821Sdesstatic void 516202613Sdeshttp_conn_trimright(conn_t *conn) 517202613Sdes{ 518221821Sdes while (conn->buflen && 519202613Sdes isspace((unsigned char)conn->buf[conn->buflen - 1])) 52097856Sdes conn->buflen--; 52197856Sdes conn->buf[conn->buflen] = '\0'; 522202613Sdes} 523202613Sdes 524202613Sdesstatic hdr_t 525202613Sdeshttp_next_header(conn_t *conn, http_headerbuf_t *hbuf, const char **p) 526202613Sdes{ 527221820Sdes unsigned int i, len; 528202613Sdes 529221821Sdes /* 530202613Sdes * Have to do the stripping here because of the first line. So 531221821Sdes * it's done twice for the subsequent lines. No big deal 532202613Sdes */ 533202613Sdes http_conn_trimright(conn); 53497856Sdes if (conn->buflen == 0) 53597856Sdes return (hdr_end); 536202613Sdes 537202613Sdes /* Copy the line to the headerbuf */ 538202613Sdes if (hbuf->bufsize < conn->buflen + 1) { 539202613Sdes if ((hbuf->buf = realloc(hbuf->buf, conn->buflen + 1)) == NULL) 540202613Sdes return (hdr_syserror); 541202613Sdes hbuf->bufsize = conn->buflen + 1; 542202613Sdes } 543202613Sdes strcpy(hbuf->buf, conn->buf); 544202613Sdes hbuf->buflen = conn->buflen; 545202613Sdes 546221821Sdes /* 547202613Sdes * Fetch possible continuation lines. Stop at 1st non-continuation 548221821Sdes * and leave it in the conn buffer 549221821Sdes */ 550202613Sdes for (i = 0; i < HTTP_MAX_CONT_LINES; i++) { 551202613Sdes if (fetch_getln(conn) == -1) 552202613Sdes return (hdr_syserror); 553202613Sdes 554221821Sdes /* 555202613Sdes * Note: we carry on the idea from the previous version 556202613Sdes * that a pure whitespace line is equivalent to an empty 557202613Sdes * one (so it's not continuation and will be handled when 558221821Sdes * we are called next) 559202613Sdes */ 560202613Sdes http_conn_trimright(conn); 561202613Sdes if (conn->buf[0] != ' ' && conn->buf[0] != "\t"[0]) 562202613Sdes break; 563202613Sdes 564202613Sdes /* Got a continuation line. Concatenate to previous */ 565202613Sdes len = hbuf->buflen + conn->buflen; 566202613Sdes if (hbuf->bufsize < len + 1) { 567202613Sdes len *= 2; 568202613Sdes if ((hbuf->buf = realloc(hbuf->buf, len + 1)) == NULL) 569202613Sdes return (hdr_syserror); 570202613Sdes hbuf->bufsize = len + 1; 571202613Sdes } 572202613Sdes strcpy(hbuf->buf + hbuf->buflen, conn->buf); 573202613Sdes hbuf->buflen += conn->buflen; 574221821Sdes } 575202613Sdes 57690267Sdes /* 57790267Sdes * We could check for malformed headers but we don't really care. 57890267Sdes * A valid header starts with a token immediately followed by a 57990267Sdes * colon; a token is any sequence of non-control, non-whitespace 58090267Sdes * characters except "()<>@,;:\\\"{}". 58190267Sdes */ 58290267Sdes for (i = 0; hdr_names[i].num != hdr_unknown; i++) 583202613Sdes if ((*p = http_match(hdr_names[i].name, hbuf->buf)) != NULL) 58490267Sdes return (hdr_names[i].num); 585202613Sdes 58690267Sdes return (hdr_unknown); 58763012Sdes} 58863012Sdes 589202613Sdes/************************** 590202613Sdes * [Proxy-]Authenticate header parsing 591202613Sdes */ 592202613Sdes 593221821Sdes/* 594221821Sdes * Read doublequote-delimited string into output buffer obuf (allocated 595202613Sdes * by caller, whose responsibility it is to ensure that it's big enough) 596202613Sdes * cp points to the first char after the initial '"' 597221821Sdes * Handles \ quoting 598221821Sdes * Returns pointer to the first char after the terminating double quote, or 599202613Sdes * NULL for error. 600202613Sdes */ 601202613Sdesstatic const char * 602202613Sdeshttp_parse_headerstring(const char *cp, char *obuf) 603202613Sdes{ 604202613Sdes for (;;) { 605202613Sdes switch (*cp) { 606202613Sdes case 0: /* Unterminated string */ 607202613Sdes *obuf = 0; 608202613Sdes return (NULL); 609202613Sdes case '"': /* Ending quote */ 610202613Sdes *obuf = 0; 611202613Sdes return (++cp); 612202613Sdes case '\\': 613202613Sdes if (*++cp == 0) { 614202613Sdes *obuf = 0; 615202613Sdes return (NULL); 616202613Sdes } 617202613Sdes /* FALLTHROUGH */ 618202613Sdes default: 619202613Sdes *obuf++ = *cp++; 620202613Sdes } 621202613Sdes } 622202613Sdes} 623202613Sdes 624202613Sdes/* Http auth challenge schemes */ 625202613Sdestypedef enum {HTTPAS_UNKNOWN, HTTPAS_BASIC,HTTPAS_DIGEST} http_auth_schemes_t; 626202613Sdes 627202613Sdes/* Data holder for a Basic or Digest challenge. */ 628202613Sdestypedef struct { 629202613Sdes http_auth_schemes_t scheme; 630202613Sdes char *realm; 631202613Sdes char *qop; 632202613Sdes char *nonce; 633202613Sdes char *opaque; 634202613Sdes char *algo; 635202613Sdes int stale; 636202613Sdes int nc; /* Nonce count */ 637202613Sdes} http_auth_challenge_t; 638202613Sdes 639221821Sdesstatic void 640202613Sdesinit_http_auth_challenge(http_auth_challenge_t *b) 641202613Sdes{ 642202613Sdes b->scheme = HTTPAS_UNKNOWN; 643202613Sdes b->realm = b->qop = b->nonce = b->opaque = b->algo = NULL; 644202613Sdes b->stale = b->nc = 0; 645202613Sdes} 646202613Sdes 647221821Sdesstatic void 648202613Sdesclean_http_auth_challenge(http_auth_challenge_t *b) 649202613Sdes{ 650221821Sdes if (b->realm) 651202613Sdes free(b->realm); 652221821Sdes if (b->qop) 653202613Sdes free(b->qop); 654221821Sdes if (b->nonce) 655202613Sdes free(b->nonce); 656221821Sdes if (b->opaque) 657202613Sdes free(b->opaque); 658221821Sdes if (b->algo) 659202613Sdes free(b->algo); 660202613Sdes init_http_auth_challenge(b); 661202613Sdes} 662202613Sdes 663202613Sdes/* Data holder for an array of challenges offered in an http response. */ 664202613Sdes#define MAX_CHALLENGES 10 665202613Sdestypedef struct { 666202613Sdes http_auth_challenge_t *challenges[MAX_CHALLENGES]; 667202613Sdes int count; /* Number of parsed challenges in the array */ 668202613Sdes int valid; /* We did parse an authenticate header */ 669202613Sdes} http_auth_challenges_t; 670202613Sdes 671221821Sdesstatic void 672202613Sdesinit_http_auth_challenges(http_auth_challenges_t *cs) 673202613Sdes{ 674202613Sdes int i; 675202613Sdes for (i = 0; i < MAX_CHALLENGES; i++) 676202613Sdes cs->challenges[i] = NULL; 677202613Sdes cs->count = cs->valid = 0; 678202613Sdes} 679202613Sdes 680221821Sdesstatic void 681202613Sdesclean_http_auth_challenges(http_auth_challenges_t *cs) 682202613Sdes{ 683202613Sdes int i; 684202613Sdes /* We rely on non-zero pointers being allocated, not on the count */ 685202613Sdes for (i = 0; i < MAX_CHALLENGES; i++) { 686202613Sdes if (cs->challenges[i] != NULL) { 687202613Sdes clean_http_auth_challenge(cs->challenges[i]); 688202613Sdes free(cs->challenges[i]); 689202613Sdes } 690202613Sdes } 691202613Sdes init_http_auth_challenges(cs); 692202613Sdes} 693202613Sdes 694221821Sdes/* 695202613Sdes * Enumeration for lexical elements. Separators will be returned as their own 696202613Sdes * ascii value 697202613Sdes */ 698202613Sdestypedef enum {HTTPHL_WORD=256, HTTPHL_STRING=257, HTTPHL_END=258, 699202613Sdes HTTPHL_ERROR = 259} http_header_lex_t; 700202613Sdes 701221821Sdes/* 702202613Sdes * Determine what kind of token comes next and return possible value 703202613Sdes * in buf, which is supposed to have been allocated big enough by 704221821Sdes * caller. Advance input pointer and return element type. 705202613Sdes */ 706221821Sdesstatic int 707202613Sdeshttp_header_lex(const char **cpp, char *buf) 708202613Sdes{ 709202613Sdes size_t l; 710202613Sdes /* Eat initial whitespace */ 711202613Sdes *cpp += strspn(*cpp, " \t"); 712202613Sdes if (**cpp == 0) 713202613Sdes return (HTTPHL_END); 714202613Sdes 715202613Sdes /* Separator ? */ 716202613Sdes if (**cpp == ',' || **cpp == '=') 717202613Sdes return (*((*cpp)++)); 718202613Sdes 719202613Sdes /* String ? */ 720202613Sdes if (**cpp == '"') { 721202613Sdes *cpp = http_parse_headerstring(++*cpp, buf); 722202613Sdes if (*cpp == NULL) 723202613Sdes return (HTTPHL_ERROR); 724202613Sdes return (HTTPHL_STRING); 725202613Sdes } 726202613Sdes 727202613Sdes /* Read other token, until separator or whitespace */ 728202613Sdes l = strcspn(*cpp, " \t,="); 729202613Sdes memcpy(buf, *cpp, l); 730202613Sdes buf[l] = 0; 731202613Sdes *cpp += l; 732202613Sdes return (HTTPHL_WORD); 733202613Sdes} 734202613Sdes 735221821Sdes/* 736202613Sdes * Read challenges from http xxx-authenticate header and accumulate them 737202613Sdes * in the challenges list structure. 738202613Sdes * 739202613Sdes * Headers with multiple challenges are specified by rfc2617, but 740202613Sdes * servers (ie: squid) often send them in separate headers instead, 741202613Sdes * which in turn is forbidden by the http spec (multiple headers with 742202613Sdes * the same name are only allowed for pure comma-separated lists, see 743202613Sdes * rfc2616 sec 4.2). 744202613Sdes * 745202613Sdes * We support both approaches anyway 746202613Sdes */ 747221821Sdesstatic int 748202613Sdeshttp_parse_authenticate(const char *cp, http_auth_challenges_t *cs) 749202613Sdes{ 750202613Sdes int ret = -1; 751202613Sdes http_header_lex_t lex; 752202613Sdes char *key = malloc(strlen(cp) + 1); 753202613Sdes char *value = malloc(strlen(cp) + 1); 754202613Sdes char *buf = malloc(strlen(cp) + 1); 755202613Sdes 756202613Sdes if (key == NULL || value == NULL || buf == NULL) { 757202613Sdes fetch_syserr(); 758202613Sdes goto out; 759202613Sdes } 760202613Sdes 761202613Sdes /* In any case we've seen the header and we set the valid bit */ 762202613Sdes cs->valid = 1; 763202613Sdes 764202613Sdes /* Need word first */ 765202613Sdes lex = http_header_lex(&cp, key); 766202613Sdes if (lex != HTTPHL_WORD) 767202613Sdes goto out; 768202613Sdes 769202613Sdes /* Loop on challenges */ 770202613Sdes for (; cs->count < MAX_CHALLENGES; cs->count++) { 771221821Sdes cs->challenges[cs->count] = 772202613Sdes malloc(sizeof(http_auth_challenge_t)); 773202613Sdes if (cs->challenges[cs->count] == NULL) { 774202613Sdes fetch_syserr(); 775202613Sdes goto out; 776202613Sdes } 777202613Sdes init_http_auth_challenge(cs->challenges[cs->count]); 778202613Sdes if (!strcasecmp(key, "basic")) { 779202613Sdes cs->challenges[cs->count]->scheme = HTTPAS_BASIC; 780202613Sdes } else if (!strcasecmp(key, "digest")) { 781202613Sdes cs->challenges[cs->count]->scheme = HTTPAS_DIGEST; 782202613Sdes } else { 783202613Sdes cs->challenges[cs->count]->scheme = HTTPAS_UNKNOWN; 784221821Sdes /* 785221821Sdes * Continue parsing as basic or digest may 786202613Sdes * follow, and the syntax is the same for 787202613Sdes * all. We'll just ignore this one when 788202613Sdes * looking at the list 789202613Sdes */ 790202613Sdes } 791221821Sdes 792202613Sdes /* Loop on attributes */ 793202613Sdes for (;;) { 794202613Sdes /* Key */ 795202613Sdes lex = http_header_lex(&cp, key); 796202613Sdes if (lex != HTTPHL_WORD) 797202613Sdes goto out; 798202613Sdes 799202613Sdes /* Equal sign */ 800202613Sdes lex = http_header_lex(&cp, buf); 801202613Sdes if (lex != '=') 802202613Sdes goto out; 803202613Sdes 804202613Sdes /* Value */ 805202613Sdes lex = http_header_lex(&cp, value); 806202613Sdes if (lex != HTTPHL_WORD && lex != HTTPHL_STRING) 807202613Sdes goto out; 808202613Sdes 809202613Sdes if (!strcasecmp(key, "realm")) 810221821Sdes cs->challenges[cs->count]->realm = 811202613Sdes strdup(value); 812202613Sdes else if (!strcasecmp(key, "qop")) 813221821Sdes cs->challenges[cs->count]->qop = 814202613Sdes strdup(value); 815202613Sdes else if (!strcasecmp(key, "nonce")) 816221821Sdes cs->challenges[cs->count]->nonce = 817202613Sdes strdup(value); 818202613Sdes else if (!strcasecmp(key, "opaque")) 819221821Sdes cs->challenges[cs->count]->opaque = 820202613Sdes strdup(value); 821202613Sdes else if (!strcasecmp(key, "algorithm")) 822221821Sdes cs->challenges[cs->count]->algo = 823202613Sdes strdup(value); 824202613Sdes else if (!strcasecmp(key, "stale")) 825221821Sdes cs->challenges[cs->count]->stale = 826202613Sdes strcasecmp(value, "no"); 827202613Sdes /* Else ignore unknown attributes */ 828202613Sdes 829202613Sdes /* Comma or Next challenge or End */ 830202613Sdes lex = http_header_lex(&cp, key); 831221821Sdes /* 832221821Sdes * If we get a word here, this is the beginning of the 833221821Sdes * next challenge. Break the attributes loop 834221821Sdes */ 835202613Sdes if (lex == HTTPHL_WORD) 836202613Sdes break; 837202613Sdes 838202613Sdes if (lex == HTTPHL_END) { 839202613Sdes /* End while looking for ',' is normal exit */ 840202613Sdes cs->count++; 841202613Sdes ret = 0; 842202613Sdes goto out; 843202613Sdes } 844202613Sdes /* Anything else is an error */ 845202613Sdes if (lex != ',') 846202613Sdes goto out; 847202613Sdes 848202613Sdes } /* End attributes loop */ 849202613Sdes } /* End challenge loop */ 850202613Sdes 851221821Sdes /* 852221821Sdes * Challenges max count exceeded. This really can't happen 853221821Sdes * with normal data, something's fishy -> error 854221821Sdes */ 855202613Sdes 856202613Sdesout: 857202613Sdes if (key) 858202613Sdes free(key); 859202613Sdes if (value) 860202613Sdes free(value); 861202613Sdes if (buf) 862202613Sdes free(buf); 863202613Sdes return (ret); 864202613Sdes} 865202613Sdes 866202613Sdes 86763012Sdes/* 86863012Sdes * Parse a last-modified header 86963012Sdes */ 87063716Sdesstatic int 871174588Sdeshttp_parse_mtime(const char *p, time_t *mtime) 87263012Sdes{ 87390267Sdes char locale[64], *r; 87490267Sdes struct tm tm; 87563012Sdes 876109967Sdes strncpy(locale, setlocale(LC_TIME, NULL), sizeof(locale)); 87790267Sdes setlocale(LC_TIME, "C"); 87890267Sdes r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 87990267Sdes /* XXX should add support for date-2 and date-3 */ 88090267Sdes setlocale(LC_TIME, locale); 88190267Sdes if (r == NULL) 88290267Sdes return (-1); 88390267Sdes DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d " 88488769Sdes "%02d:%02d:%02d]\n", 88563012Sdes tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 88663012Sdes tm.tm_hour, tm.tm_min, tm.tm_sec)); 88790267Sdes *mtime = timegm(&tm); 88890267Sdes return (0); 88963012Sdes} 89063012Sdes 89163012Sdes/* 89263012Sdes * Parse a content-length header 89363012Sdes */ 89463716Sdesstatic int 895174588Sdeshttp_parse_length(const char *p, off_t *length) 89663012Sdes{ 89790267Sdes off_t len; 89890267Sdes 899174761Sdes for (len = 0; *p && isdigit((unsigned char)*p); ++p) 90090267Sdes len = len * 10 + (*p - '0'); 90190267Sdes if (*p) 90290267Sdes return (-1); 90390267Sdes DEBUG(fprintf(stderr, "content length: [%lld]\n", 90490267Sdes (long long)len)); 90590267Sdes *length = len; 90690267Sdes return (0); 90763012Sdes} 90863012Sdes 90963012Sdes/* 91063012Sdes * Parse a content-range header 91163012Sdes */ 91263716Sdesstatic int 913174588Sdeshttp_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) 91463012Sdes{ 91590267Sdes off_t first, last, len; 91663716Sdes 91790267Sdes if (strncasecmp(p, "bytes ", 6) != 0) 91890267Sdes return (-1); 919125696Sdes p += 6; 920125696Sdes if (*p == '*') { 921125696Sdes first = last = -1; 922125696Sdes ++p; 923125696Sdes } else { 924174761Sdes for (first = 0; *p && isdigit((unsigned char)*p); ++p) 925125696Sdes first = first * 10 + *p - '0'; 926125696Sdes if (*p != '-') 927125696Sdes return (-1); 928174761Sdes for (last = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 929125696Sdes last = last * 10 + *p - '0'; 930125696Sdes } 93190267Sdes if (first > last || *p != '/') 93290267Sdes return (-1); 933174761Sdes for (len = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 93490267Sdes len = len * 10 + *p - '0'; 93590267Sdes if (*p || len < last - first + 1) 93690267Sdes return (-1); 937125696Sdes if (first == -1) { 938125696Sdes DEBUG(fprintf(stderr, "content range: [*/%lld]\n", 939125696Sdes (long long)len)); 940125696Sdes *length = 0; 941125696Sdes } else { 942125696Sdes DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n", 943125696Sdes (long long)first, (long long)last, (long long)len)); 944125696Sdes *length = last - first + 1; 945125696Sdes } 94690267Sdes *offset = first; 94790267Sdes *size = len; 94890267Sdes return (0); 94963012Sdes} 95063012Sdes 95190267Sdes 95263012Sdes/***************************************************************************** 95363012Sdes * Helper functions for authorization 95463012Sdes */ 95563012Sdes 95663012Sdes/* 95737608Sdes * Base64 encoding 95837608Sdes */ 95962965Sdesstatic char * 960174588Sdeshttp_base64(const char *src) 96137608Sdes{ 96290267Sdes static const char base64[] = 96390267Sdes "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 96490267Sdes "abcdefghijklmnopqrstuvwxyz" 96590267Sdes "0123456789+/"; 96690267Sdes char *str, *dst; 96790267Sdes size_t l; 96890267Sdes int t, r; 96962965Sdes 97090267Sdes l = strlen(src); 971133280Sdes if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL) 97290267Sdes return (NULL); 97390267Sdes dst = str; 97490267Sdes r = 0; 97537608Sdes 97690267Sdes while (l >= 3) { 97790267Sdes t = (src[0] << 16) | (src[1] << 8) | src[2]; 97890267Sdes dst[0] = base64[(t >> 18) & 0x3f]; 97990267Sdes dst[1] = base64[(t >> 12) & 0x3f]; 98090267Sdes dst[2] = base64[(t >> 6) & 0x3f]; 98190267Sdes dst[3] = base64[(t >> 0) & 0x3f]; 98290267Sdes src += 3; l -= 3; 98390267Sdes dst += 4; r += 4; 98490267Sdes } 98537608Sdes 98690267Sdes switch (l) { 98790267Sdes case 2: 98890267Sdes t = (src[0] << 16) | (src[1] << 8); 98990267Sdes dst[0] = base64[(t >> 18) & 0x3f]; 99090267Sdes dst[1] = base64[(t >> 12) & 0x3f]; 99190267Sdes dst[2] = base64[(t >> 6) & 0x3f]; 99290267Sdes dst[3] = '='; 99390267Sdes dst += 4; 99490267Sdes r += 4; 99590267Sdes break; 99690267Sdes case 1: 99790267Sdes t = src[0] << 16; 99890267Sdes dst[0] = base64[(t >> 18) & 0x3f]; 99990267Sdes dst[1] = base64[(t >> 12) & 0x3f]; 100090267Sdes dst[2] = dst[3] = '='; 100190267Sdes dst += 4; 100290267Sdes r += 4; 100390267Sdes break; 100490267Sdes case 0: 100590267Sdes break; 100690267Sdes } 100790267Sdes 100890267Sdes *dst = 0; 100990267Sdes return (str); 101037608Sdes} 101137608Sdes 1012202613Sdes 101337608Sdes/* 1014202613Sdes * Extract authorization parameters from environment value. 1015202613Sdes * The value is like scheme:realm:user:pass 1016202613Sdes */ 1017202613Sdestypedef struct { 1018202613Sdes char *scheme; 1019202613Sdes char *realm; 1020202613Sdes char *user; 1021202613Sdes char *password; 1022202613Sdes} http_auth_params_t; 1023202613Sdes 1024202613Sdesstatic void 1025202613Sdesinit_http_auth_params(http_auth_params_t *s) 1026202613Sdes{ 1027202613Sdes s->scheme = s->realm = s->user = s->password = 0; 1028202613Sdes} 1029202613Sdes 1030221821Sdesstatic void 1031202613Sdesclean_http_auth_params(http_auth_params_t *s) 1032202613Sdes{ 1033221821Sdes if (s->scheme) 1034202613Sdes free(s->scheme); 1035221821Sdes if (s->realm) 1036202613Sdes free(s->realm); 1037221821Sdes if (s->user) 1038202613Sdes free(s->user); 1039221821Sdes if (s->password) 1040202613Sdes free(s->password); 1041202613Sdes init_http_auth_params(s); 1042202613Sdes} 1043202613Sdes 1044202613Sdesstatic int 1045202613Sdeshttp_authfromenv(const char *p, http_auth_params_t *parms) 1046202613Sdes{ 1047202613Sdes int ret = -1; 1048202613Sdes char *v, *ve; 1049202613Sdes char *str = strdup(p); 1050202613Sdes 1051202613Sdes if (str == NULL) { 1052202613Sdes fetch_syserr(); 1053202613Sdes return (-1); 1054202613Sdes } 1055202613Sdes v = str; 1056202613Sdes 1057202613Sdes if ((ve = strchr(v, ':')) == NULL) 1058202613Sdes goto out; 1059202613Sdes 1060202613Sdes *ve = 0; 1061202613Sdes if ((parms->scheme = strdup(v)) == NULL) { 1062202613Sdes fetch_syserr(); 1063202613Sdes goto out; 1064202613Sdes } 1065202613Sdes v = ve + 1; 1066202613Sdes 1067202613Sdes if ((ve = strchr(v, ':')) == NULL) 1068202613Sdes goto out; 1069202613Sdes 1070202613Sdes *ve = 0; 1071202613Sdes if ((parms->realm = strdup(v)) == NULL) { 1072202613Sdes fetch_syserr(); 1073202613Sdes goto out; 1074202613Sdes } 1075202613Sdes v = ve + 1; 1076202613Sdes 1077202613Sdes if ((ve = strchr(v, ':')) == NULL) 1078202613Sdes goto out; 1079202613Sdes 1080202613Sdes *ve = 0; 1081202613Sdes if ((parms->user = strdup(v)) == NULL) { 1082202613Sdes fetch_syserr(); 1083202613Sdes goto out; 1084202613Sdes } 1085202613Sdes v = ve + 1; 1086202613Sdes 1087202613Sdes 1088202613Sdes if ((parms->password = strdup(v)) == NULL) { 1089202613Sdes fetch_syserr(); 1090202613Sdes goto out; 1091202613Sdes } 1092202613Sdes ret = 0; 1093202613Sdesout: 1094221821Sdes if (ret == -1) 1095202613Sdes clean_http_auth_params(parms); 1096202613Sdes if (str) 1097202613Sdes free(str); 1098202613Sdes return (ret); 1099202613Sdes} 1100202613Sdes 1101202613Sdes 1102221821Sdes/* 1103202613Sdes * Digest response: the code to compute the digest is taken from the 1104221821Sdes * sample implementation in RFC2616 1105202613Sdes */ 1106221822Sdes#define IN const 1107202613Sdes#define OUT 1108202613Sdes 1109202613Sdes#define HASHLEN 16 1110202613Sdestypedef char HASH[HASHLEN]; 1111202613Sdes#define HASHHEXLEN 32 1112202613Sdestypedef char HASHHEX[HASHHEXLEN+1]; 1113202613Sdes 1114202613Sdesstatic const char *hexchars = "0123456789abcdef"; 1115221821Sdesstatic void 1116202613SdesCvtHex(IN HASH Bin, OUT HASHHEX Hex) 1117202613Sdes{ 1118202613Sdes unsigned short i; 1119202613Sdes unsigned char j; 1120202613Sdes 1121202613Sdes for (i = 0; i < HASHLEN; i++) { 1122202613Sdes j = (Bin[i] >> 4) & 0xf; 1123202613Sdes Hex[i*2] = hexchars[j]; 1124202613Sdes j = Bin[i] & 0xf; 1125202613Sdes Hex[i*2+1] = hexchars[j]; 1126202613Sdes }; 1127202613Sdes Hex[HASHHEXLEN] = '\0'; 1128202613Sdes}; 1129202613Sdes 1130202613Sdes/* calculate H(A1) as per spec */ 1131221821Sdesstatic void 1132202613SdesDigestCalcHA1( 1133202613Sdes IN char * pszAlg, 1134202613Sdes IN char * pszUserName, 1135202613Sdes IN char * pszRealm, 1136202613Sdes IN char * pszPassword, 1137202613Sdes IN char * pszNonce, 1138202613Sdes IN char * pszCNonce, 1139202613Sdes OUT HASHHEX SessionKey 1140202613Sdes ) 1141202613Sdes{ 1142202613Sdes MD5_CTX Md5Ctx; 1143202613Sdes HASH HA1; 1144202613Sdes 1145202613Sdes MD5Init(&Md5Ctx); 1146202613Sdes MD5Update(&Md5Ctx, pszUserName, strlen(pszUserName)); 1147202613Sdes MD5Update(&Md5Ctx, ":", 1); 1148202613Sdes MD5Update(&Md5Ctx, pszRealm, strlen(pszRealm)); 1149202613Sdes MD5Update(&Md5Ctx, ":", 1); 1150202613Sdes MD5Update(&Md5Ctx, pszPassword, strlen(pszPassword)); 1151202613Sdes MD5Final(HA1, &Md5Ctx); 1152202613Sdes if (strcasecmp(pszAlg, "md5-sess") == 0) { 1153202613Sdes 1154202613Sdes MD5Init(&Md5Ctx); 1155202613Sdes MD5Update(&Md5Ctx, HA1, HASHLEN); 1156202613Sdes MD5Update(&Md5Ctx, ":", 1); 1157202613Sdes MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); 1158202613Sdes MD5Update(&Md5Ctx, ":", 1); 1159202613Sdes MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); 1160202613Sdes MD5Final(HA1, &Md5Ctx); 1161202613Sdes }; 1162202613Sdes CvtHex(HA1, SessionKey); 1163202613Sdes} 1164202613Sdes 1165202613Sdes/* calculate request-digest/response-digest as per HTTP Digest spec */ 1166221821Sdesstatic void 1167202613SdesDigestCalcResponse( 1168202613Sdes IN HASHHEX HA1, /* H(A1) */ 1169202613Sdes IN char * pszNonce, /* nonce from server */ 1170202613Sdes IN char * pszNonceCount, /* 8 hex digits */ 1171202613Sdes IN char * pszCNonce, /* client nonce */ 1172202613Sdes IN char * pszQop, /* qop-value: "", "auth", "auth-int" */ 1173202613Sdes IN char * pszMethod, /* method from the request */ 1174202613Sdes IN char * pszDigestUri, /* requested URL */ 1175202613Sdes IN HASHHEX HEntity, /* H(entity body) if qop="auth-int" */ 1176202613Sdes OUT HASHHEX Response /* request-digest or response-digest */ 1177202613Sdes ) 1178202613Sdes{ 1179221821Sdes/* DEBUG(fprintf(stderr, 1180202613Sdes "Calc: HA1[%s] Nonce[%s] qop[%s] method[%s] URI[%s]\n", 1181202613Sdes HA1, pszNonce, pszQop, pszMethod, pszDigestUri));*/ 1182202613Sdes MD5_CTX Md5Ctx; 1183202613Sdes HASH HA2; 1184202613Sdes HASH RespHash; 1185202613Sdes HASHHEX HA2Hex; 1186202613Sdes 1187202613Sdes // calculate H(A2) 1188202613Sdes MD5Init(&Md5Ctx); 1189202613Sdes MD5Update(&Md5Ctx, pszMethod, strlen(pszMethod)); 1190202613Sdes MD5Update(&Md5Ctx, ":", 1); 1191202613Sdes MD5Update(&Md5Ctx, pszDigestUri, strlen(pszDigestUri)); 1192202613Sdes if (strcasecmp(pszQop, "auth-int") == 0) { 1193202613Sdes MD5Update(&Md5Ctx, ":", 1); 1194202613Sdes MD5Update(&Md5Ctx, HEntity, HASHHEXLEN); 1195202613Sdes }; 1196202613Sdes MD5Final(HA2, &Md5Ctx); 1197202613Sdes CvtHex(HA2, HA2Hex); 1198202613Sdes 1199202613Sdes // calculate response 1200202613Sdes MD5Init(&Md5Ctx); 1201202613Sdes MD5Update(&Md5Ctx, HA1, HASHHEXLEN); 1202202613Sdes MD5Update(&Md5Ctx, ":", 1); 1203202613Sdes MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); 1204202613Sdes MD5Update(&Md5Ctx, ":", 1); 1205202613Sdes if (*pszQop) { 1206202613Sdes MD5Update(&Md5Ctx, pszNonceCount, strlen(pszNonceCount)); 1207202613Sdes MD5Update(&Md5Ctx, ":", 1); 1208202613Sdes MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); 1209202613Sdes MD5Update(&Md5Ctx, ":", 1); 1210202613Sdes MD5Update(&Md5Ctx, pszQop, strlen(pszQop)); 1211202613Sdes MD5Update(&Md5Ctx, ":", 1); 1212202613Sdes }; 1213202613Sdes MD5Update(&Md5Ctx, HA2Hex, HASHHEXLEN); 1214202613Sdes MD5Final(RespHash, &Md5Ctx); 1215202613Sdes CvtHex(RespHash, Response); 1216202613Sdes} 1217202613Sdes 1218221821Sdes/* 1219221821Sdes * Generate/Send a Digest authorization header 1220202613Sdes * This looks like: [Proxy-]Authorization: credentials 1221202613Sdes * 1222202613Sdes * credentials = "Digest" digest-response 1223202613Sdes * digest-response = 1#( username | realm | nonce | digest-uri 1224202613Sdes * | response | [ algorithm ] | [cnonce] | 1225202613Sdes * [opaque] | [message-qop] | 1226202613Sdes * [nonce-count] | [auth-param] ) 1227202613Sdes * username = "username" "=" username-value 1228202613Sdes * username-value = quoted-string 1229202613Sdes * digest-uri = "uri" "=" digest-uri-value 1230202613Sdes * digest-uri-value = request-uri ; As specified by HTTP/1.1 1231202613Sdes * message-qop = "qop" "=" qop-value 1232202613Sdes * cnonce = "cnonce" "=" cnonce-value 1233202613Sdes * cnonce-value = nonce-value 1234202613Sdes * nonce-count = "nc" "=" nc-value 1235202613Sdes * nc-value = 8LHEX 1236202613Sdes * response = "response" "=" request-digest 1237202613Sdes * request-digest = <"> 32LHEX <"> 1238202613Sdes */ 1239202613Sdesstatic int 1240202613Sdeshttp_digest_auth(conn_t *conn, const char *hdr, http_auth_challenge_t *c, 1241202613Sdes http_auth_params_t *parms, struct url *url) 1242202613Sdes{ 1243202613Sdes int r; 1244202613Sdes char noncecount[10]; 1245202613Sdes char cnonce[40]; 1246202613Sdes char *options = 0; 1247202613Sdes 1248202613Sdes if (!c->realm || !c->nonce) { 1249202613Sdes DEBUG(fprintf(stderr, "realm/nonce not set in challenge\n")); 1250202613Sdes return(-1); 1251202613Sdes } 1252221821Sdes if (!c->algo) 1253202613Sdes c->algo = strdup(""); 1254202613Sdes 1255221821Sdes if (asprintf(&options, "%s%s%s%s", 1256202613Sdes *c->algo? ",algorithm=" : "", c->algo, 1257202613Sdes c->opaque? ",opaque=" : "", c->opaque?c->opaque:"")== -1) 1258202613Sdes return (-1); 1259202613Sdes 1260202613Sdes if (!c->qop) { 1261202613Sdes c->qop = strdup(""); 1262202613Sdes *noncecount = 0; 1263202613Sdes *cnonce = 0; 1264202613Sdes } else { 1265202613Sdes c->nc++; 1266202613Sdes sprintf(noncecount, "%08x", c->nc); 1267202613Sdes /* We don't try very hard with the cnonce ... */ 1268202613Sdes sprintf(cnonce, "%x%lx", getpid(), (unsigned long)time(0)); 1269202613Sdes } 1270202613Sdes 1271202613Sdes HASHHEX HA1; 1272202613Sdes DigestCalcHA1(c->algo, parms->user, c->realm, 1273202613Sdes parms->password, c->nonce, cnonce, HA1); 1274202613Sdes DEBUG(fprintf(stderr, "HA1: [%s]\n", HA1)); 1275202613Sdes HASHHEX digest; 1276202613Sdes DigestCalcResponse(HA1, c->nonce, noncecount, cnonce, c->qop, 1277202613Sdes "GET", url->doc, "", digest); 1278202613Sdes 1279202613Sdes if (c->qop[0]) { 1280202613Sdes r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," 1281202613Sdes "nonce=\"%s\",uri=\"%s\",response=\"%s\"," 1282202613Sdes "qop=\"auth\", cnonce=\"%s\", nc=%s%s", 1283221821Sdes hdr, parms->user, c->realm, 1284202613Sdes c->nonce, url->doc, digest, 1285202613Sdes cnonce, noncecount, options); 1286202613Sdes } else { 1287202613Sdes r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," 1288202613Sdes "nonce=\"%s\",uri=\"%s\",response=\"%s\"%s", 1289221821Sdes hdr, parms->user, c->realm, 1290202613Sdes c->nonce, url->doc, digest, options); 1291202613Sdes } 1292202613Sdes if (options) 1293202613Sdes free(options); 1294202613Sdes return (r); 1295202613Sdes} 1296202613Sdes 1297202613Sdes/* 129837608Sdes * Encode username and password 129937608Sdes */ 130062965Sdesstatic int 1301174588Sdeshttp_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd) 130237608Sdes{ 130390267Sdes char *upw, *auth; 130490267Sdes int r; 130537608Sdes 1306202613Sdes DEBUG(fprintf(stderr, "basic: usr: [%s]\n", usr)); 1307202613Sdes DEBUG(fprintf(stderr, "basic: pwd: [%s]\n", pwd)); 130890267Sdes if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 130990267Sdes return (-1); 1310174588Sdes auth = http_base64(upw); 131190267Sdes free(upw); 131290267Sdes if (auth == NULL) 131390267Sdes return (-1); 1314174588Sdes r = http_cmd(conn, "%s: Basic %s", hdr, auth); 131590267Sdes free(auth); 131690267Sdes return (r); 131762965Sdes} 131862965Sdes 131962965Sdes/* 1320221821Sdes * Chose the challenge to answer and call the appropriate routine to 1321202613Sdes * produce the header. 132262965Sdes */ 132362965Sdesstatic int 1324202613Sdeshttp_authorize(conn_t *conn, const char *hdr, http_auth_challenges_t *cs, 1325202613Sdes http_auth_params_t *parms, struct url *url) 132662965Sdes{ 1327202613Sdes http_auth_challenge_t *basic = NULL; 1328202613Sdes http_auth_challenge_t *digest = NULL; 1329202613Sdes int i; 133062965Sdes 1331202613Sdes /* If user or pass are null we're not happy */ 1332202613Sdes if (!parms->user || !parms->password) { 1333202613Sdes DEBUG(fprintf(stderr, "NULL usr or pass\n")); 1334202613Sdes return (-1); 133590267Sdes } 1336202613Sdes 1337202613Sdes /* Look for a Digest and a Basic challenge */ 1338202613Sdes for (i = 0; i < cs->count; i++) { 1339202613Sdes if (cs->challenges[i]->scheme == HTTPAS_BASIC) 1340202613Sdes basic = cs->challenges[i]; 1341202613Sdes if (cs->challenges[i]->scheme == HTTPAS_DIGEST) 1342202613Sdes digest = cs->challenges[i]; 1343202613Sdes } 1344202613Sdes 1345202613Sdes /* Error if "Digest" was specified and there is no Digest challenge */ 1346221821Sdes if (!digest && (parms->scheme && 1347202613Sdes !strcasecmp(parms->scheme, "digest"))) { 1348221821Sdes DEBUG(fprintf(stderr, 1349202613Sdes "Digest auth in env, not supported by peer\n")); 1350202613Sdes return (-1); 1351202613Sdes } 1352221821Sdes /* 1353221821Sdes * If "basic" was specified in the environment, or there is no Digest 1354202613Sdes * challenge, do the basic thing. Don't need a challenge for this, 1355221821Sdes * so no need to check basic!=NULL 1356202613Sdes */ 1357202613Sdes if (!digest || (parms->scheme && !strcasecmp(parms->scheme,"basic"))) 1358202613Sdes return (http_basic_auth(conn,hdr,parms->user,parms->password)); 1359202613Sdes 1360202613Sdes /* Else, prefer digest. We just checked that it's not NULL */ 1361202613Sdes return (http_digest_auth(conn, hdr, digest, parms, url)); 136237608Sdes} 136337608Sdes 136463012Sdes/***************************************************************************** 136563012Sdes * Helper functions for connecting to a server or proxy 136663012Sdes */ 136763012Sdes 136837608Sdes/* 136990267Sdes * Connect to the correct HTTP server or proxy. 137063012Sdes */ 137197856Sdesstatic conn_t * 1372174588Sdeshttp_connect(struct url *URL, struct url *purl, const char *flags) 137363012Sdes{ 137497856Sdes conn_t *conn; 137590267Sdes int verbose; 1376141958Skbyanc int af, val; 137790267Sdes 137863012Sdes#ifdef INET6 137990267Sdes af = AF_UNSPEC; 138060737Sume#else 138190267Sdes af = AF_INET; 138260737Sume#endif 138390267Sdes 138490267Sdes verbose = CHECK_FLAG('v'); 138590267Sdes if (CHECK_FLAG('4')) 138690267Sdes af = AF_INET; 138767043Sdes#ifdef INET6 138890267Sdes else if (CHECK_FLAG('6')) 138990267Sdes af = AF_INET6; 139067043Sdes#endif 139167043Sdes 139297868Sdes if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) { 139390267Sdes URL = purl; 139490267Sdes } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 139590267Sdes /* can't talk http to an ftp server */ 139690267Sdes /* XXX should set an error code */ 139797856Sdes return (NULL); 139890267Sdes } 139990267Sdes 1400174588Sdes if ((conn = fetch_connect(URL->host, URL->port, af, verbose)) == NULL) 1401174588Sdes /* fetch_connect() has already set an error code */ 140297856Sdes return (NULL); 140397868Sdes if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && 1404174588Sdes fetch_ssl(conn, verbose) == -1) { 1405174588Sdes fetch_close(conn); 140697891Sdes /* grrr */ 140797891Sdes errno = EAUTH; 1408174588Sdes fetch_syserr(); 140997868Sdes return (NULL); 141097868Sdes } 1411141958Skbyanc 1412141958Skbyanc val = 1; 1413141958Skbyanc setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val)); 1414141958Skbyanc 141597856Sdes return (conn); 141667043Sdes} 141767043Sdes 141867043Sdesstatic struct url * 1419174752Sdeshttp_get_proxy(struct url * url, const char *flags) 142067043Sdes{ 142190267Sdes struct url *purl; 142290267Sdes char *p; 142390267Sdes 1424112797Sdes if (flags != NULL && strchr(flags, 'd') != NULL) 1425112081Sdes return (NULL); 1426174752Sdes if (fetch_no_proxy_match(url->host)) 1427174752Sdes return (NULL); 142890267Sdes if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1429149414Sdes *p && (purl = fetchParseURL(p))) { 143090267Sdes if (!*purl->scheme) 143190267Sdes strcpy(purl->scheme, SCHEME_HTTP); 143290267Sdes if (!purl->port) 1433174588Sdes purl->port = fetch_default_proxy_port(purl->scheme); 143490267Sdes if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 143590267Sdes return (purl); 143690267Sdes fetchFreeURL(purl); 143790267Sdes } 143890267Sdes return (NULL); 143960376Sdes} 144060376Sdes 144188771Sdesstatic void 1442174588Sdeshttp_print_html(FILE *out, FILE *in) 144388771Sdes{ 144490267Sdes size_t len; 144590267Sdes char *line, *p, *q; 144690267Sdes int comment, tag; 144788771Sdes 144890267Sdes comment = tag = 0; 144990267Sdes while ((line = fgetln(in, &len)) != NULL) { 1450174761Sdes while (len && isspace((unsigned char)line[len - 1])) 145190267Sdes --len; 145290267Sdes for (p = q = line; q < line + len; ++q) { 145390267Sdes if (comment && *q == '-') { 145490267Sdes if (q + 2 < line + len && 145590267Sdes strcmp(q, "-->") == 0) { 145690267Sdes tag = comment = 0; 145790267Sdes q += 2; 145890267Sdes } 145990267Sdes } else if (tag && !comment && *q == '>') { 146090267Sdes p = q + 1; 146190267Sdes tag = 0; 146290267Sdes } else if (!tag && *q == '<') { 146390267Sdes if (q > p) 146490267Sdes fwrite(p, q - p, 1, out); 146590267Sdes tag = 1; 146690267Sdes if (q + 3 < line + len && 146790267Sdes strcmp(q, "<!--") == 0) { 146890267Sdes comment = 1; 146990267Sdes q += 3; 147090267Sdes } 147190267Sdes } 147288771Sdes } 147390267Sdes if (!tag && q > p) 147490267Sdes fwrite(p, q - p, 1, out); 147590267Sdes fputc('\n', out); 147688771Sdes } 147788771Sdes} 147888771Sdes 147990267Sdes 148063012Sdes/***************************************************************************** 148163012Sdes * Core 148260954Sdes */ 148360954Sdes 148460954Sdes/* 148563012Sdes * Send a request and process the reply 148697866Sdes * 148797866Sdes * XXX This function is way too long, the do..while loop should be split 148897866Sdes * XXX off into a separate function. 148960376Sdes */ 149067043SdesFILE * 1491174588Sdeshttp_request(struct url *URL, const char *op, struct url_stat *us, 1492202613Sdes struct url *purl, const char *flags) 149360376Sdes{ 1494186124Smurray char timebuf[80]; 1495186124Smurray char hbuf[MAXHOSTNAMELEN + 7], *host; 149697856Sdes conn_t *conn; 149790267Sdes struct url *url, *new; 1498202613Sdes int chunked, direct, ims, noredirect, verbose; 1499143049Skbyanc int e, i, n, val; 150090267Sdes off_t offset, clength, length, size; 150190267Sdes time_t mtime; 150290267Sdes const char *p; 150390267Sdes FILE *f; 150490267Sdes hdr_t h; 1505186124Smurray struct tm *timestruct; 1506202613Sdes http_headerbuf_t headerbuf; 1507202613Sdes http_auth_challenges_t server_challenges; 1508202613Sdes http_auth_challenges_t proxy_challenges; 150963012Sdes 1510202613Sdes /* The following calls don't allocate anything */ 1511221821Sdes init_http_headerbuf(&headerbuf); 1512202613Sdes init_http_auth_challenges(&server_challenges); 1513202613Sdes init_http_auth_challenges(&proxy_challenges); 1514202613Sdes 151590267Sdes direct = CHECK_FLAG('d'); 151690267Sdes noredirect = CHECK_FLAG('A'); 151790267Sdes verbose = CHECK_FLAG('v'); 1518186124Smurray ims = CHECK_FLAG('i'); 151960737Sume 152090267Sdes if (direct && purl) { 152190267Sdes fetchFreeURL(purl); 152290267Sdes purl = NULL; 152390267Sdes } 152463716Sdes 152590267Sdes /* try the provided URL first */ 152690267Sdes url = URL; 152763012Sdes 1528241840Seadler n = MAX_REDIRECT; 152990267Sdes i = 0; 153063012Sdes 153198422Sdes e = HTTP_PROTOCOL_ERROR; 153290267Sdes do { 153390267Sdes new = NULL; 153490267Sdes chunked = 0; 153590267Sdes offset = 0; 153690267Sdes clength = -1; 153790267Sdes length = -1; 153890267Sdes size = -1; 153990267Sdes mtime = 0; 154090267Sdes 154190267Sdes /* check port */ 154290267Sdes if (!url->port) 1543174588Sdes url->port = fetch_default_port(url->scheme); 154490267Sdes 154590267Sdes /* were we redirected to an FTP URL? */ 154690267Sdes if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) { 154790267Sdes if (strcmp(op, "GET") == 0) 1548174588Sdes return (ftp_request(url, "RETR", us, purl, flags)); 154990267Sdes else if (strcmp(op, "HEAD") == 0) 1550174588Sdes return (ftp_request(url, "STAT", us, purl, flags)); 155190267Sdes } 155290267Sdes 155390267Sdes /* connect to server or proxy */ 1554174588Sdes if ((conn = http_connect(url, purl, flags)) == NULL) 155590267Sdes goto ouch; 155690267Sdes 155790267Sdes host = url->host; 155860737Sume#ifdef INET6 155990267Sdes if (strchr(url->host, ':')) { 156090267Sdes snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 156190267Sdes host = hbuf; 156290267Sdes } 156360737Sume#endif 1564174588Sdes if (url->port != fetch_default_port(url->scheme)) { 1565107372Sdes if (host != hbuf) { 1566107372Sdes strcpy(hbuf, host); 1567107372Sdes host = hbuf; 1568107372Sdes } 1569107372Sdes snprintf(hbuf + strlen(hbuf), 1570107372Sdes sizeof(hbuf) - strlen(hbuf), ":%d", url->port); 1571107372Sdes } 157237535Sdes 157390267Sdes /* send request */ 157490267Sdes if (verbose) 1575174588Sdes fetch_info("requesting %s://%s%s", 1576107372Sdes url->scheme, host, url->doc); 157790267Sdes if (purl) { 1578174588Sdes http_cmd(conn, "%s %s://%s%s HTTP/1.1", 1579107372Sdes op, url->scheme, host, url->doc); 158090267Sdes } else { 1581174588Sdes http_cmd(conn, "%s %s HTTP/1.1", 158290267Sdes op, url->doc); 158390267Sdes } 158437535Sdes 1585186124Smurray if (ims && url->ims_time) { 1586186124Smurray timestruct = gmtime((time_t *)&url->ims_time); 1587186124Smurray (void)strftime(timebuf, 80, "%a, %d %b %Y %T GMT", 1588186124Smurray timestruct); 1589186124Smurray if (verbose) 1590186124Smurray fetch_info("If-Modified-Since: %s", timebuf); 1591186124Smurray http_cmd(conn, "If-Modified-Since: %s", timebuf); 1592186124Smurray } 159390267Sdes /* virtual host */ 1594174588Sdes http_cmd(conn, "Host: %s", host); 159590267Sdes 1596221821Sdes /* 1597221821Sdes * Proxy authorization: we only send auth after we received 1598221821Sdes * a 407 error. We do not first try basic anyway (changed 1599221821Sdes * when support was added for digest-auth) 1600221821Sdes */ 1601202613Sdes if (purl && proxy_challenges.valid) { 1602202613Sdes http_auth_params_t aparams; 1603202613Sdes init_http_auth_params(&aparams); 1604202613Sdes if (*purl->user || *purl->pwd) { 1605221821Sdes aparams.user = purl->user ? 1606202613Sdes strdup(purl->user) : strdup(""); 1607202613Sdes aparams.password = purl->pwd? 1608202613Sdes strdup(purl->pwd) : strdup(""); 1609221821Sdes } else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && 1610202613Sdes *p != '\0') { 1611202613Sdes if (http_authfromenv(p, &aparams) < 0) { 1612202613Sdes http_seterr(HTTP_NEED_PROXY_AUTH); 1613202613Sdes goto ouch; 1614202613Sdes } 1615202613Sdes } 1616221821Sdes http_authorize(conn, "Proxy-Authorization", 1617202613Sdes &proxy_challenges, &aparams, url); 1618202613Sdes clean_http_auth_params(&aparams); 161990267Sdes } 162090267Sdes 1621221821Sdes /* 1622221821Sdes * Server authorization: we never send "a priori" 1623202613Sdes * Basic auth, which used to be done if user/pass were 1624202613Sdes * set in the url. This would be weird because we'd send the 1625221821Sdes * password in the clear even if Digest is finally to be 1626202613Sdes * used (it would have made more sense for the 1627221821Sdes * pre-digest version to do this when Basic was specified 1628221821Sdes * in the environment) 1629221821Sdes */ 1630202613Sdes if (server_challenges.valid) { 1631202613Sdes http_auth_params_t aparams; 1632202613Sdes init_http_auth_params(&aparams); 1633202613Sdes if (*url->user || *url->pwd) { 1634221821Sdes aparams.user = url->user ? 1635202613Sdes strdup(url->user) : strdup(""); 1636221821Sdes aparams.password = url->pwd ? 1637202613Sdes strdup(url->pwd) : strdup(""); 1638221821Sdes } else if ((p = getenv("HTTP_AUTH")) != NULL && 1639202613Sdes *p != '\0') { 1640202613Sdes if (http_authfromenv(p, &aparams) < 0) { 1641202613Sdes http_seterr(HTTP_NEED_AUTH); 1642202613Sdes goto ouch; 1643202613Sdes } 1644221821Sdes } else if (fetchAuthMethod && 1645202613Sdes fetchAuthMethod(url) == 0) { 1646221821Sdes aparams.user = url->user ? 1647202613Sdes strdup(url->user) : strdup(""); 1648221821Sdes aparams.password = url->pwd ? 1649202613Sdes strdup(url->pwd) : strdup(""); 165090267Sdes } else { 1651174588Sdes http_seterr(HTTP_NEED_AUTH); 165290267Sdes goto ouch; 165390267Sdes } 1654221821Sdes http_authorize(conn, "Authorization", 1655202613Sdes &server_challenges, &aparams, url); 1656202613Sdes clean_http_auth_params(&aparams); 165790267Sdes } 165890267Sdes 165990267Sdes /* other headers */ 1660107372Sdes if ((p = getenv("HTTP_REFERER")) != NULL && *p != '\0') { 1661107372Sdes if (strcasecmp(p, "auto") == 0) 1662174588Sdes http_cmd(conn, "Referer: %s://%s%s", 1663107372Sdes url->scheme, host, url->doc); 1664107372Sdes else 1665174588Sdes http_cmd(conn, "Referer: %s", p); 1666107372Sdes } 166790267Sdes if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0') 1668174588Sdes http_cmd(conn, "User-Agent: %s", p); 166990267Sdes else 1670174588Sdes http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname()); 1671109693Sdes if (url->offset > 0) 1672174588Sdes http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset); 1673174588Sdes http_cmd(conn, "Connection: close"); 1674174588Sdes http_cmd(conn, ""); 167590267Sdes 1676143049Skbyanc /* 1677143049Skbyanc * Force the queued request to be dispatched. Normally, one 1678143049Skbyanc * would do this with shutdown(2) but squid proxies can be 1679143049Skbyanc * configured to disallow such half-closed connections. To 1680143049Skbyanc * be compatible with such configurations, fiddle with socket 1681143049Skbyanc * options to force the pending data to be written. 1682143049Skbyanc */ 1683143049Skbyanc val = 0; 1684143049Skbyanc setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, 1685143049Skbyanc sizeof(val)); 1686143049Skbyanc val = 1; 1687143049Skbyanc setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val, 1688143049Skbyanc sizeof(val)); 1689143049Skbyanc 169090267Sdes /* get reply */ 1691174588Sdes switch (http_get_reply(conn)) { 169290267Sdes case HTTP_OK: 169390267Sdes case HTTP_PARTIAL: 1694186124Smurray case HTTP_NOT_MODIFIED: 169590267Sdes /* fine */ 169690267Sdes break; 169790267Sdes case HTTP_MOVED_PERM: 169890267Sdes case HTTP_MOVED_TEMP: 169990267Sdes case HTTP_SEE_OTHER: 170090267Sdes /* 1701125695Sdes * Not so fine, but we still have to read the 1702125695Sdes * headers to get the new location. 170390267Sdes */ 170490267Sdes break; 170590267Sdes case HTTP_NEED_AUTH: 1706202613Sdes if (server_challenges.valid) { 170790267Sdes /* 1708125695Sdes * We already sent out authorization code, 1709125695Sdes * so there's nothing more we can do. 171090267Sdes */ 1711174588Sdes http_seterr(conn->err); 171290267Sdes goto ouch; 171390267Sdes } 171490267Sdes /* try again, but send the password this time */ 171590267Sdes if (verbose) 1716174588Sdes fetch_info("server requires authorization"); 171790267Sdes break; 171890267Sdes case HTTP_NEED_PROXY_AUTH: 1719202613Sdes if (proxy_challenges.valid) { 1720202613Sdes /* 1721202613Sdes * We already sent our proxy 1722202613Sdes * authorization code, so there's 1723202613Sdes * nothing more we can do. */ 1724202613Sdes http_seterr(conn->err); 1725202613Sdes goto ouch; 1726202613Sdes } 1727202613Sdes /* try again, but send the password this time */ 1728202613Sdes if (verbose) 1729202613Sdes fetch_info("proxy requires authorization"); 1730202613Sdes break; 1731125696Sdes case HTTP_BAD_RANGE: 1732125696Sdes /* 1733125696Sdes * This can happen if we ask for 0 bytes because 1734125696Sdes * we already have the whole file. Consider this 1735125696Sdes * a success for now, and check sizes later. 1736125696Sdes */ 1737125696Sdes break; 173890267Sdes case HTTP_PROTOCOL_ERROR: 173990267Sdes /* fall through */ 174090267Sdes case -1: 1741174588Sdes fetch_syserr(); 174290267Sdes goto ouch; 174390267Sdes default: 1744174588Sdes http_seterr(conn->err); 174590267Sdes if (!verbose) 174690267Sdes goto ouch; 174790267Sdes /* fall through so we can get the full error message */ 174890267Sdes } 174990267Sdes 1750202613Sdes /* get headers. http_next_header expects one line readahead */ 1751202613Sdes if (fetch_getln(conn) == -1) { 1752202613Sdes fetch_syserr(); 1753202613Sdes goto ouch; 1754202613Sdes } 175590267Sdes do { 1756202613Sdes switch ((h = http_next_header(conn, &headerbuf, &p))) { 175790267Sdes case hdr_syserror: 1758174588Sdes fetch_syserr(); 175990267Sdes goto ouch; 176090267Sdes case hdr_error: 1761174588Sdes http_seterr(HTTP_PROTOCOL_ERROR); 176290267Sdes goto ouch; 176390267Sdes case hdr_content_length: 1764174588Sdes http_parse_length(p, &clength); 176590267Sdes break; 176690267Sdes case hdr_content_range: 1767174588Sdes http_parse_range(p, &offset, &length, &size); 176890267Sdes break; 176990267Sdes case hdr_last_modified: 1770174588Sdes http_parse_mtime(p, &mtime); 177190267Sdes break; 177290267Sdes case hdr_location: 177397856Sdes if (!HTTP_REDIRECT(conn->err)) 177490267Sdes break; 1775241840Seadler /* 1776241840Seadler * if the A flag is set, we don't follow 1777241840Seadler * temporary redirects. 1778241840Seadler */ 1779241840Seadler if (noredirect && 1780241840Seadler conn->err != HTTP_MOVED_PERM && 1781241840Seadler conn->err != HTTP_PERM_REDIRECT) { 1782241840Seadler n = 1; 1783241840Seadler break; 1784241840Seadler } 178590267Sdes if (new) 178690267Sdes free(new); 178790267Sdes if (verbose) 1788174588Sdes fetch_info("%d redirect to %s", conn->err, p); 178990267Sdes if (*p == '/') 179090267Sdes /* absolute path */ 179190267Sdes new = fetchMakeURL(url->scheme, url->host, url->port, p, 179290267Sdes url->user, url->pwd); 179390267Sdes else 179490267Sdes new = fetchParseURL(p); 179590267Sdes if (new == NULL) { 179690267Sdes /* XXX should set an error code */ 179790267Sdes DEBUG(fprintf(stderr, "failed to parse new URL\n")); 179890267Sdes goto ouch; 179990267Sdes } 1800234838Sdes 1801234838Sdes /* Only copy credentials if the host matches */ 1802234838Sdes if (!strcmp(new->host, url->host) && !*new->user && !*new->pwd) { 180390267Sdes strcpy(new->user, url->user); 180490267Sdes strcpy(new->pwd, url->pwd); 180590267Sdes } 180690267Sdes new->offset = url->offset; 180790267Sdes new->length = url->length; 180890267Sdes break; 180990267Sdes case hdr_transfer_encoding: 181090267Sdes /* XXX weak test*/ 181190267Sdes chunked = (strcasecmp(p, "chunked") == 0); 181290267Sdes break; 181390267Sdes case hdr_www_authenticate: 181497856Sdes if (conn->err != HTTP_NEED_AUTH) 181590267Sdes break; 1816210563Sdes if (http_parse_authenticate(p, &server_challenges) == 0) 1817209632Sdes ++n; 181890267Sdes break; 1819202613Sdes case hdr_proxy_authenticate: 1820202613Sdes if (conn->err != HTTP_NEED_PROXY_AUTH) 1821202613Sdes break; 1822210563Sdes if (http_parse_authenticate(p, &proxy_challenges) == 0) 1823209632Sdes ++n; 1824202613Sdes break; 182590267Sdes case hdr_end: 182690267Sdes /* fall through */ 182790267Sdes case hdr_unknown: 182890267Sdes /* ignore */ 182990267Sdes break; 183090267Sdes } 183190267Sdes } while (h > hdr_end); 183290267Sdes 183390267Sdes /* we need to provide authentication */ 1834221821Sdes if (conn->err == HTTP_NEED_AUTH || 1835202613Sdes conn->err == HTTP_NEED_PROXY_AUTH) { 183698422Sdes e = conn->err; 1837221821Sdes if ((conn->err == HTTP_NEED_AUTH && 1838221821Sdes !server_challenges.valid) || 1839221821Sdes (conn->err == HTTP_NEED_PROXY_AUTH && 1840202613Sdes !proxy_challenges.valid)) { 1841202613Sdes /* 401/7 but no www/proxy-authenticate ?? */ 1842202613Sdes DEBUG(fprintf(stderr, "401/7 and no auth header\n")); 1843202613Sdes goto ouch; 1844202613Sdes } 1845174588Sdes fetch_close(conn); 184697856Sdes conn = NULL; 184790267Sdes continue; 184890267Sdes } 184990267Sdes 1850125696Sdes /* requested range not satisfiable */ 1851125696Sdes if (conn->err == HTTP_BAD_RANGE) { 1852125696Sdes if (url->offset == size && url->length == 0) { 1853125696Sdes /* asked for 0 bytes; fake it */ 1854125696Sdes offset = url->offset; 1855184222Sru clength = -1; 1856125696Sdes conn->err = HTTP_OK; 1857125696Sdes break; 1858125696Sdes } else { 1859174588Sdes http_seterr(conn->err); 1860125696Sdes goto ouch; 1861125696Sdes } 1862125696Sdes } 1863125696Sdes 1864104404Sru /* we have a hit or an error */ 1865186124Smurray if (conn->err == HTTP_OK 1866186124Smurray || conn->err == HTTP_NOT_MODIFIED 1867186124Smurray || conn->err == HTTP_PARTIAL 1868186124Smurray || HTTP_ERROR(conn->err)) 1869104404Sru break; 1870104404Sru 187190267Sdes /* all other cases: we got a redirect */ 187298422Sdes e = conn->err; 1873202613Sdes clean_http_auth_challenges(&server_challenges); 1874174588Sdes fetch_close(conn); 187597856Sdes conn = NULL; 187690267Sdes if (!new) { 187790267Sdes DEBUG(fprintf(stderr, "redirect with no new location\n")); 187890267Sdes break; 187990267Sdes } 188090267Sdes if (url != URL) 188190267Sdes fetchFreeURL(url); 188290267Sdes url = new; 188390267Sdes } while (++i < n); 188490267Sdes 188590267Sdes /* we failed, or ran out of retries */ 188697856Sdes if (conn == NULL) { 1887174588Sdes http_seterr(e); 188863012Sdes goto ouch; 188963012Sdes } 189060376Sdes 189190267Sdes DEBUG(fprintf(stderr, "offset %lld, length %lld," 189290267Sdes " size %lld, clength %lld\n", 189390267Sdes (long long)offset, (long long)length, 189490267Sdes (long long)size, (long long)clength)); 189560376Sdes 1896186124Smurray if (conn->err == HTTP_NOT_MODIFIED) { 1897186124Smurray http_seterr(HTTP_NOT_MODIFIED); 1898186124Smurray return (NULL); 1899186124Smurray } 1900186124Smurray 190190267Sdes /* check for inconsistencies */ 190290267Sdes if (clength != -1 && length != -1 && clength != length) { 1903174588Sdes http_seterr(HTTP_PROTOCOL_ERROR); 190463012Sdes goto ouch; 190563012Sdes } 190690267Sdes if (clength == -1) 190790267Sdes clength = length; 190890267Sdes if (clength != -1) 190990267Sdes length = offset + clength; 191090267Sdes if (length != -1 && size != -1 && length != size) { 1911174588Sdes http_seterr(HTTP_PROTOCOL_ERROR); 191263012Sdes goto ouch; 191390267Sdes } 191490267Sdes if (size == -1) 191590267Sdes size = length; 191660376Sdes 191790267Sdes /* fill in stats */ 191890267Sdes if (us) { 191990267Sdes us->size = size; 192090267Sdes us->atime = us->mtime = mtime; 192190267Sdes } 192263069Sdes 192390267Sdes /* too far? */ 1924109693Sdes if (URL->offset > 0 && offset > URL->offset) { 1925174588Sdes http_seterr(HTTP_PROTOCOL_ERROR); 192690267Sdes goto ouch; 192777238Sdes } 192860376Sdes 192990267Sdes /* report back real offset and size */ 193090267Sdes URL->offset = offset; 193190267Sdes URL->length = clength; 193237535Sdes 193390267Sdes /* wrap it up in a FILE */ 1934174588Sdes if ((f = http_funopen(conn, chunked)) == NULL) { 1935174588Sdes fetch_syserr(); 193690267Sdes goto ouch; 193790267Sdes } 193863716Sdes 193990267Sdes if (url != URL) 194090267Sdes fetchFreeURL(url); 194190267Sdes if (purl) 194290267Sdes fetchFreeURL(purl); 194363567Sdes 194497856Sdes if (HTTP_ERROR(conn->err)) { 1945174588Sdes http_print_html(stderr, f); 194690267Sdes fclose(f); 194790267Sdes f = NULL; 194890267Sdes } 1949202613Sdes clean_http_headerbuf(&headerbuf); 1950202613Sdes clean_http_auth_challenges(&server_challenges); 1951202613Sdes clean_http_auth_challenges(&proxy_challenges); 195290267Sdes return (f); 195388771Sdes 195490267Sdesouch: 195590267Sdes if (url != URL) 195690267Sdes fetchFreeURL(url); 195790267Sdes if (purl) 195890267Sdes fetchFreeURL(purl); 195997856Sdes if (conn != NULL) 1960174588Sdes fetch_close(conn); 1961202613Sdes clean_http_headerbuf(&headerbuf); 1962202613Sdes clean_http_auth_challenges(&server_challenges); 1963202613Sdes clean_http_auth_challenges(&proxy_challenges); 196490267Sdes return (NULL); 196563012Sdes} 196660189Sdes 196790267Sdes 196863012Sdes/***************************************************************************** 196963012Sdes * Entry points 197063012Sdes */ 197163012Sdes 197263012Sdes/* 197363340Sdes * Retrieve and stat a file by HTTP 197463340Sdes */ 197563340SdesFILE * 197675891SarchiefetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags) 197763340Sdes{ 1978174752Sdes return (http_request(URL, "GET", us, http_get_proxy(URL, flags), flags)); 197963340Sdes} 198063340Sdes 198163340Sdes/* 198263012Sdes * Retrieve a file by HTTP 198363012Sdes */ 198463012SdesFILE * 198575891SarchiefetchGetHTTP(struct url *URL, const char *flags) 198663012Sdes{ 198790267Sdes return (fetchXGetHTTP(URL, NULL, flags)); 198837535Sdes} 198937535Sdes 199063340Sdes/* 199163340Sdes * Store a file by HTTP 199263340Sdes */ 199337535SdesFILE * 199485093SdesfetchPutHTTP(struct url *URL __unused, const char *flags __unused) 199537535Sdes{ 199690267Sdes warnx("fetchPutHTTP(): not implemented"); 199790267Sdes return (NULL); 199837535Sdes} 199940975Sdes 200040975Sdes/* 200140975Sdes * Get an HTTP document's metadata 200240975Sdes */ 200340975Sdesint 200475891SarchiefetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags) 200540975Sdes{ 200690267Sdes FILE *f; 200790267Sdes 2008174752Sdes f = http_request(URL, "HEAD", us, http_get_proxy(URL, flags), flags); 2009112081Sdes if (f == NULL) 201090267Sdes return (-1); 201190267Sdes fclose(f); 201290267Sdes return (0); 201340975Sdes} 201441989Sdes 201541989Sdes/* 201641989Sdes * List a directory 201741989Sdes */ 201841989Sdesstruct url_ent * 201985093SdesfetchListHTTP(struct url *url __unused, const char *flags __unused) 202041989Sdes{ 202190267Sdes warnx("fetchListHTTP(): not implemented"); 202290267Sdes return (NULL); 202341989Sdes} 2024