http.c revision 226537
162590Sitojun/*- 2122615Sume * Copyright (c) 2000-2011 Dag-Erling Sm��rgrav 362590Sitojun * All rights reserved. 455505Sshin * 555505Sshin * Redistribution and use in source and binary forms, with or without 655505Sshin * modification, are permitted provided that the following conditions 755505Sshin * are met: 855505Sshin * 1. Redistributions of source code must retain the above copyright 955505Sshin * notice, this list of conditions and the following disclaimer 1055505Sshin * in this position and unchanged. 1155505Sshin * 2. Redistributions in binary form must reproduce the above copyright 1255505Sshin * notice, this list of conditions and the following disclaimer in the 1355505Sshin * documentation and/or other materials provided with the distribution. 1455505Sshin * 3. The name of the author may not be used to endorse or promote products 1555505Sshin * derived from this software without specific prior written permission. 1655505Sshin * 1755505Sshin * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1855505Sshin * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1955505Sshin * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 2055505Sshin * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 2155505Sshin * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2255505Sshin * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2355505Sshin * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2455505Sshin * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2555505Sshin * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2655505Sshin * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2755505Sshin */ 2855505Sshin 2955505Sshin#include <sys/cdefs.h> 3055505Sshin__FBSDID("$FreeBSD: head/lib/libfetch/http.c 226537 2011-10-19 11:43:51Z des $"); 3155505Sshin 3255505Sshin/* 3355505Sshin * The following copyright applies to the base64 code: 3455505Sshin * 3555505Sshin *- 3655505Sshin * Copyright 1997 Massachusetts Institute of Technology 3755505Sshin * 3855505Sshin * Permission to use, copy, modify, and distribute this software and 3955505Sshin * its documentation for any purpose and without fee is hereby 4055505Sshin * granted, provided that both the above copyright notice and this 4155505Sshin * permission notice appear in all copies, that both the above 4255505Sshin * copyright notice and this permission notice appear in all 4355505Sshin * supporting documentation, and that the name of M.I.T. not be used 4455505Sshin * in advertising or publicity pertaining to distribution of the 4555505Sshin * software without specific, written prior permission. M.I.T. makes 4655505Sshin * no representations about the suitability of this software for any 4755505Sshin * purpose. It is provided "as is" without express or implied 4855505Sshin * warranty. 4955505Sshin * 5055505Sshin * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 5155505Sshin * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 5255505Sshin * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 5355505Sshin * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 5455505Sshin * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 5555505Sshin * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 5655505Sshin * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 5755505Sshin * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 5855505Sshin * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 5955505Sshin * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 6055505Sshin * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 6155505Sshin * SUCH DAMAGE. 6255505Sshin */ 6355505Sshin 6455505Sshin#include <sys/param.h> 6555505Sshin#include <sys/socket.h> 6655505Sshin#include <sys/time.h> 6755505Sshin 6855505Sshin#include <ctype.h> 6955505Sshin#include <err.h> 7055505Sshin#include <errno.h> 7155505Sshin#include <locale.h> 7255505Sshin#include <netdb.h> 7355505Sshin#include <stdarg.h> 7455505Sshin#include <stdio.h> 7555505Sshin#include <stdlib.h> 7655505Sshin#include <string.h> 7755505Sshin#include <time.h> 7855505Sshin#include <unistd.h> 7955505Sshin#include <md5.h> 8055505Sshin 8155505Sshin#include <netinet/in.h> 82253999Shrs#include <netinet/tcp.h> 8378064Sume 8455505Sshin#include "fetch.h" 8555505Sshin#include "common.h" 8655505Sshin#include "httperr.h" 8755505Sshin 8855505Sshin/* Maximum number of redirects to follow */ 8955505Sshin#define MAX_REDIRECT 5 9055505Sshin 9155505Sshin/* Symbolic names for reply codes we care about */ 9255505Sshin#define HTTP_OK 200 9355505Sshin#define HTTP_PARTIAL 206 9455505Sshin#define HTTP_MOVED_PERM 301 9555505Sshin#define HTTP_MOVED_TEMP 302 9655505Sshin#define HTTP_SEE_OTHER 303 9755505Sshin#define HTTP_NOT_MODIFIED 304 9855505Sshin#define HTTP_TEMP_REDIRECT 307 99265778Smelifaro#define HTTP_NEED_AUTH 401 10055505Sshin#define HTTP_NEED_PROXY_AUTH 407 10155505Sshin#define HTTP_BAD_RANGE 416 10255505Sshin#define HTTP_PROTOCOL_ERROR 999 10355505Sshin 10455505Sshin#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ 10555505Sshin || (xyz) == HTTP_MOVED_TEMP \ 10655505Sshin || (xyz) == HTTP_TEMP_REDIRECT \ 10755505Sshin || (xyz) == HTTP_SEE_OTHER) 10855505Sshin 10955505Sshin#define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599) 11055505Sshin 11155505Sshin 112186119Sqingli/***************************************************************************** 113186119Sqingli * I/O functions for decoding chunked streams 114196866Sbz */ 115186119Sqingli 116186119Sqinglistruct httpio 117100650Sjmallett{ 11862590Sitojun conn_t *conn; /* connection */ 11962590Sitojun int chunked; /* chunked mode */ 12062590Sitojun char *buf; /* chunk buffer */ 12162590Sitojun size_t bufsize; /* size of chunk buffer */ 12262590Sitojun ssize_t buflen; /* amount of data currently in buffer */ 12355505Sshin int bufpos; /* current read offset in buffer */ 124287097Shrs int eof; /* end-of-file flag */ 125287097Shrs int error; /* error flag */ 12655505Sshin size_t chunksize; /* remaining size of current chunk */ 127265778Smelifaro#ifndef NDEBUG 128287097Shrs size_t total; 129287097Shrs#endif 130287097Shrs}; 131287097Shrs 132287097Shrs/* 133173412Skevlo * Get next chunk header 134173412Skevlo */ 135287097Shrsstatic int 136287097Shrshttp_new_chunk(struct httpio *io) 137287097Shrs{ 138287097Shrs char *p; 139287097Shrs 140287097Shrs if (fetch_getln(io->conn) == -1) 141287097Shrs return (-1); 142287097Shrs 143287097Shrs if (io->conn->buflen < 2 || !isxdigit((unsigned char)*io->conn->buf)) 14462590Sitojun return (-1); 145173412Skevlo 146173412Skevlo for (p = io->conn->buf; *p && !isspace((unsigned char)*p); ++p) { 14762590Sitojun if (*p == ';') 148173412Skevlo break; 149253999Shrs if (!isxdigit((unsigned char)*p)) 15055505Sshin return (-1); 15178064Sume if (isdigit((unsigned char)*p)) { 15278064Sume io->chunksize = io->chunksize * 16 + 15378064Sume *p - '0'; 15478064Sume } else { 15578064Sume io->chunksize = io->chunksize * 16 + 15678064Sume 10 + tolower((unsigned char)*p) - 'a'; 15778064Sume } 15855505Sshin } 159259169Sae 16055505Sshin#ifndef NDEBUG 161287097Shrs if (fetchDebug) { 162287097Shrs io->total += io->chunksize; 16355505Sshin if (io->chunksize == 0) 16455505Sshin fprintf(stderr, "%s(): end of last chunk\n", __func__); 16555505Sshin else 166122615Sume fprintf(stderr, "%s(): new chunk: %lu (%lu)\n", 167121156Sume __func__, (unsigned long)io->chunksize, 16855505Sshin (unsigned long)io->total); 16955505Sshin } 170122615Sume#endif 171122615Sume 172122615Sume return (io->chunksize); 173122615Sume} 174122615Sume 175122615Sume/* 176122615Sume * Grow the input buffer to at least len bytes 177122615Sume */ 178122615Sumestatic inline int 179122615Sumehttp_growbuf(struct httpio *io, size_t len) 180122615Sume{ 181122615Sume char *tmp; 182122615Sume 18355505Sshin if (io->bufsize >= len) 184122615Sume return (0); 185265778Smelifaro 186268827Speter if ((tmp = realloc(io->buf, len)) == NULL) 187265778Smelifaro return (-1); 188122615Sume io->buf = tmp; 18955505Sshin io->bufsize = len; 190122615Sume return (0); 191122615Sume} 192122615Sume 193122615Sume/* 194122615Sume * Fill the input buffer, do chunk decoding on the fly 19555505Sshin */ 19655505Sshinstatic int 19755505Sshinhttp_fillbuf(struct httpio *io, size_t len) 19855505Sshin{ 19955505Sshin if (io->error) 20055505Sshin return (-1); 20155505Sshin if (io->eof) 202122615Sume return (0); 203122615Sume 204122615Sume if (io->chunked == 0) { 205122615Sume if (http_growbuf(io, len) == -1) 206122615Sume return (-1); 20755505Sshin if ((io->buflen = fetch_read(io->conn, io->buf, len)) == -1) { 208122615Sume io->error = 1; 20955505Sshin return (-1); 210122615Sume } 211122615Sume io->bufpos = 0; 21255505Sshin return (io->buflen); 21355505Sshin } 21455505Sshin 21555505Sshin if (io->chunksize == 0) { 21655505Sshin switch (http_new_chunk(io)) { 21755505Sshin case -1: 21855505Sshin io->error = 1; 21955505Sshin return (-1); 220122615Sume case 0: 221122615Sume io->eof = 1; 222122615Sume return (0); 223122615Sume } 22455505Sshin } 225122615Sume 226122615Sume if (len > io->chunksize) 227122615Sume len = io->chunksize; 228122615Sume if (http_growbuf(io, len) == -1) 229122615Sume return (-1); 230122615Sume if ((io->buflen = fetch_read(io->conn, io->buf, len)) == -1) { 231122615Sume io->error = 1; 232122615Sume return (-1); 233122615Sume } 234122615Sume io->chunksize -= io->buflen; 235122615Sume 236122615Sume if (io->chunksize == 0) { 237122615Sume char endl[2]; 238122615Sume 239122615Sume if (fetch_read(io->conn, endl, 2) != 2 || 240122615Sume endl[0] != '\r' || endl[1] != '\n') 241122615Sume return (-1); 242122615Sume } 243122615Sume 244122615Sume io->bufpos = 0; 245122615Sume 246122615Sume return (io->buflen); 247122615Sume} 248122615Sume 249122615Sume/* 250122615Sume * Read function 251122615Sume */ 252122615Sumestatic int 253122615Sumehttp_readfn(void *v, char *buf, int len) 254122615Sume{ 255122615Sume struct httpio *io = (struct httpio *)v; 256122615Sume int l, pos; 257122615Sume 258122615Sume if (io->error) 25955505Sshin return (-1); 260122615Sume if (io->eof) 261122615Sume return (0); 262122615Sume 263122615Sume for (pos = 0; len > 0; pos += l, len -= l) { 264122615Sume /* empty buffer */ 265122615Sume if (!io->buf || io->bufpos == io->buflen) 266122615Sume if (http_fillbuf(io, len) < 1) 267122615Sume break; 268122615Sume l = io->buflen - io->bufpos; 26955505Sshin if (len < l) 270122615Sume l = len; 271122615Sume memcpy(buf + pos, io->buf + io->bufpos, l); 27255505Sshin io->bufpos += l; 27355505Sshin } 27455505Sshin 275122615Sume if (!pos && io->error) 276122615Sume return (-1); 277122615Sume return (pos); 278122615Sume} 279122615Sume 28055505Sshin/* 281122615Sume * Write function 282122615Sume */ 283122615Sumestatic int 284122615Sumehttp_writefn(void *v, const char *buf, int len) 285122615Sume{ 286122615Sume struct httpio *io = (struct httpio *)v; 28755505Sshin 288122615Sume return (fetch_write(io->conn, buf, len)); 289122615Sume} 290122615Sume 291122615Sume/* 292122615Sume * Close function 293122615Sume */ 29455505Sshinstatic int 295122615Sumehttp_closefn(void *v) 296122615Sume{ 297122615Sume struct httpio *io = (struct httpio *)v; 298122615Sume int r; 299122615Sume 300122615Sume r = fetch_close(io->conn); 301122615Sume if (io->buf) 302122615Sume free(io->buf); 30355505Sshin free(io); 30455505Sshin return (r); 30555505Sshin} 30655505Sshin 30755505Sshin/* 30855505Sshin * Wrap a file descriptor up 30955505Sshin */ 310265778Smelifarostatic FILE * 311259169Saehttp_funopen(conn_t *conn, int chunked) 31255505Sshin{ 31355505Sshin struct httpio *io; 31455505Sshin FILE *f; 315265778Smelifaro 31655505Sshin if ((io = calloc(1, sizeof(*io))) == NULL) { 317265778Smelifaro fetch_syserr(); 318265778Smelifaro return (NULL); 31955505Sshin } 32055505Sshin io->conn = conn; 32155505Sshin io->chunked = chunked; 32255505Sshin f = funopen(io, http_readfn, http_writefn, NULL, http_closefn); 32355505Sshin if (f == NULL) { 32455505Sshin fetch_syserr(); 325167260Skevlo free(io); 326265778Smelifaro return (NULL); 327265778Smelifaro } 328265778Smelifaro return (f); 329265778Smelifaro} 330265778Smelifaro 331122615Sume 332122615Sume/***************************************************************************** 33355505Sshin * Helper functions for talking to the server and parsing its replies 334265778Smelifaro */ 33555505Sshin 33655505Sshin/* Header types */ 33755505Sshintypedef enum { 33855505Sshin hdr_syserror = -2, 33955505Sshin hdr_error = -1, 34055505Sshin hdr_end = 0, 34155505Sshin hdr_unknown = 1, 34255505Sshin hdr_content_length, 34355505Sshin hdr_content_range, 34455505Sshin hdr_last_modified, 345287097Shrs hdr_location, 34655505Sshin hdr_transfer_encoding, 34755505Sshin hdr_www_authenticate, 34855505Sshin hdr_proxy_authenticate, 34955505Sshin} hdr_t; 35055505Sshin 351121156Sume/* Names of interesting headers */ 352121156Sumestatic struct { 35355505Sshin hdr_t num; 35455505Sshin const char *name; 35555505Sshin} hdr_names[] = { 35655505Sshin { hdr_content_length, "Content-Length" }, 357287097Shrs { hdr_content_range, "Content-Range" }, 358287097Shrs { hdr_last_modified, "Last-Modified" }, 359287097Shrs { hdr_location, "Location" }, 360287097Shrs { hdr_transfer_encoding, "Transfer-Encoding" }, 361287097Shrs { hdr_www_authenticate, "WWW-Authenticate" }, 362287097Shrs { hdr_proxy_authenticate, "Proxy-Authenticate" }, 363287097Shrs { hdr_unknown, NULL }, 364287097Shrs}; 365287097Shrs 366287097Shrs/* 367287097Shrs * Send a formatted line; optionally echo to terminal 368287097Shrs */ 369287097Shrsstatic int 370287097Shrshttp_cmd(conn_t *conn, const char *fmt, ...) 371287097Shrs{ 372287097Shrs va_list ap; 373287097Shrs size_t len; 37455505Sshin char *msg; 37555505Sshin int r; 376287097Shrs 37755505Sshin va_start(ap, fmt); 37855505Sshin len = vasprintf(&msg, fmt, ap); 37955505Sshin va_end(ap); 38055505Sshin 381287097Shrs if (msg == NULL) { 382259169Sae errno = ENOMEM; 38355505Sshin fetch_syserr(); 38455505Sshin return (-1); 38555505Sshin } 38655505Sshin 38755505Sshin r = fetch_putln(conn, msg, len); 38855505Sshin free(msg); 38955505Sshin 39055505Sshin if (r == -1) { 39155505Sshin fetch_syserr(); 39255505Sshin return (-1); 39355505Sshin } 39455505Sshin 39555505Sshin return (0); 39655505Sshin} 39755505Sshin 39855505Sshin/* 39955505Sshin * Get and parse status line 40055505Sshin */ 40155505Sshinstatic int 40255505Sshinhttp_get_reply(conn_t *conn) 40355505Sshin{ 40455505Sshin char *p; 40555505Sshin 40655505Sshin if (fetch_getln(conn) == -1) 407243903Shrs return (-1); 408243903Shrs /* 40955505Sshin * A valid status line looks like "HTTP/m.n xyz reason" where m 41055505Sshin * and n are the major and minor protocol version numbers and xyz 41155505Sshin * is the reply code. 41255505Sshin * Unfortunately, there are servers out there (NCSA 1.5.1, to name 41355505Sshin * just one) that do not send a version number, so we can't rely 41455505Sshin * on finding one, but if we do, insist on it being 1.0 or 1.1. 415253999Shrs * We don't care about the reason phrase. 416121156Sume */ 417253999Shrs if (strncmp(conn->buf, "HTTP", 4) != 0) 418253970Shrs return (HTTP_PROTOCOL_ERROR); 41962590Sitojun p = conn->buf + 4; 42062590Sitojun if (*p == '/') { 42155505Sshin if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) 42255505Sshin return (HTTP_PROTOCOL_ERROR); 42355505Sshin p += 4; 424121156Sume } 425121156Sume if (*p != ' ' || 42655505Sshin !isdigit((unsigned char)p[1]) || 42755505Sshin !isdigit((unsigned char)p[2]) || 428259171Sae !isdigit((unsigned char)p[3])) 42955505Sshin return (HTTP_PROTOCOL_ERROR); 43055505Sshin 431122615Sume conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'); 432122615Sume return (conn->err); 433122615Sume} 434122615Sume 435210936Sjhb/* 436122615Sume * Check a header; if the type matches the given string, return a pointer 437122615Sume * to the beginning of the value. 43855505Sshin */ 43962590Sitojunstatic const char * 44062590Sitojunhttp_match(const char *str, const char *hdr) 44155505Sshin{ 44262590Sitojun while (*str && *hdr && 44355505Sshin tolower((unsigned char)*str++) == tolower((unsigned char)*hdr++)) 44455505Sshin /* nothing */; 44555505Sshin if (*str || *hdr != ':') 44655505Sshin return (NULL); 44755505Sshin while (*hdr && isspace((unsigned char)*++hdr)) 44855505Sshin /* nothing */; 44955505Sshin return (hdr); 45055505Sshin} 45155505Sshin 45255505Sshin 45355505Sshin/* 45455505Sshin * Get the next header and return the appropriate symbolic code. We 45555505Sshin * need to read one line ahead for checking for a continuation line 456287097Shrs * belonging to the current header (continuation lines start with 457259169Sae * white space). 45855505Sshin * 45955505Sshin * We get called with a fresh line already in the conn buffer, either 46055505Sshin * from the previous http_next_header() invocation, or, the first 46155505Sshin * time, from a fetch_getln() performed by our caller. 46255505Sshin * 46355505Sshin * This stops when we encounter an empty line (we dont read beyond the header 46455505Sshin * area). 46555505Sshin * 46655505Sshin * Note that the "headerbuf" is just a place to return the result. Its 46755505Sshin * contents are not used for the next call. This means that no cleanup 46855505Sshin * is needed when ie doing another connection, just call the cleanup when 469121156Sume * fully done to deallocate memory. 47055505Sshin */ 47155505Sshin 47255505Sshin/* Limit the max number of continuation lines to some reasonable value */ 473259176Sae#define HTTP_MAX_CONT_LINES 10 474259176Sae 475259176Sae/* Place into which to build a header from one or several lines */ 47655505Sshintypedef struct { 47755505Sshin char *buf; /* buffer */ 478121156Sume size_t bufsize; /* buffer size */ 479121156Sume size_t buflen; /* length of buffer contents */ 48055505Sshin} http_headerbuf_t; 48155505Sshin 48255505Sshinstatic void 48355505Sshininit_http_headerbuf(http_headerbuf_t *buf) 48455505Sshin{ 48555505Sshin buf->buf = NULL; 48655505Sshin buf->bufsize = 0; 48755505Sshin buf->buflen = 0; 488287097Shrs} 489259169Sae 49055505Sshinstatic void 49155505Sshinclean_http_headerbuf(http_headerbuf_t *buf) 49255505Sshin{ 493186119Sqingli if (buf->buf) 49455505Sshin free(buf->buf); 49555505Sshin init_http_headerbuf(buf); 49655505Sshin} 49755505Sshin 49855505Sshin/* Remove whitespace at the end of the buffer */ 49955505Sshinstatic void 50055505Sshinhttp_conn_trimright(conn_t *conn) 50155505Sshin{ 50255505Sshin while (conn->buflen && 50355505Sshin isspace((unsigned char)conn->buf[conn->buflen - 1])) 50455505Sshin conn->buflen--; 50555505Sshin conn->buf[conn->buflen] = '\0'; 506121156Sume} 50755505Sshin 50855505Sshinstatic hdr_t 50955505Sshinhttp_next_header(conn_t *conn, http_headerbuf_t *hbuf, const char **p) 510243903Shrs{ 511243903Shrs unsigned int i, len; 51255505Sshin 513121156Sume /* 514121156Sume * Have to do the stripping here because of the first line. So 51555505Sshin * it's done twice for the subsequent lines. No big deal 51655505Sshin */ 517259171Sae http_conn_trimright(conn); 51855505Sshin if (conn->buflen == 0) 51955505Sshin return (hdr_end); 52062590Sitojun 52178064Sume /* Copy the line to the headerbuf */ 52255505Sshin if (hbuf->bufsize < conn->buflen + 1) { 52362590Sitojun if ((hbuf->buf = realloc(hbuf->buf, conn->buflen + 1)) == NULL) 52462590Sitojun return (hdr_syserror); 52555505Sshin hbuf->bufsize = conn->buflen + 1; 52662590Sitojun } 52755505Sshin strcpy(hbuf->buf, conn->buf); 52855505Sshin hbuf->buflen = conn->buflen; 52955505Sshin 53055505Sshin /* 53155505Sshin * Fetch possible continuation lines. Stop at 1st non-continuation 532186119Sqingli * and leave it in the conn buffer 533186119Sqingli */ 534186119Sqingli for (i = 0; i < HTTP_MAX_CONT_LINES; i++) { 535186119Sqingli if (fetch_getln(conn) == -1) 536186119Sqingli return (hdr_syserror); 537186500Sqingli 53855505Sshin /* 539243903Shrs * Note: we carry on the idea from the previous version 540243903Shrs * that a pure whitespace line is equivalent to an empty 541121156Sume * one (so it's not continuation and will be handled when 542121156Sume * we are called next) 54355505Sshin */ 54455505Sshin http_conn_trimright(conn); 54555505Sshin if (conn->buf[0] != ' ' && conn->buf[0] != "\t"[0]) 54655505Sshin break; 54755505Sshin 54855505Sshin /* Got a continuation line. Concatenate to previous */ 549122615Sume len = hbuf->buflen + conn->buflen; 55078064Sume if (hbuf->bufsize < len + 1) { 55178064Sume len *= 2; 55278064Sume if ((hbuf->buf = realloc(hbuf->buf, len + 1)) == NULL) 55355505Sshin return (hdr_syserror); 55455505Sshin hbuf->bufsize = len + 1; 55555505Sshin } 556287097Shrs strcpy(hbuf->buf + hbuf->buflen, conn->buf); 557259176Sae hbuf->buflen += conn->buflen; 55855505Sshin } 55955505Sshin 56055505Sshin /* 56162590Sitojun * We could check for malformed headers but we don't really care. 56255505Sshin * A valid header starts with a token immediately followed by a 56355505Sshin * colon; a token is any sequence of non-control, non-whitespace 56455505Sshin * characters except "()<>@,;:\\\"{}". 56555505Sshin */ 566253999Shrs for (i = 0; hdr_names[i].num != hdr_unknown; i++) 567292333Smelifaro if ((*p = http_match(hdr_names[i].name, hbuf->buf)) != NULL) 56855505Sshin return (hdr_names[i].num); 56978064Sume 57078064Sume return (hdr_unknown); 57162590Sitojun} 57278064Sume 57355505Sshin/************************** 57455505Sshin * [Proxy-]Authenticate header parsing 57566865Ssumikawa */ 576122615Sume 57778064Sume/* 578122615Sume * Read doublequote-delimited string into output buffer obuf (allocated 57955505Sshin * by caller, whose responsibility it is to ensure that it's big enough) 58055505Sshin * cp points to the first char after the initial '"' 58155505Sshin * Handles \ quoting 58255505Sshin * Returns pointer to the first char after the terminating double quote, or 58355505Sshin * NULL for error. 58455505Sshin */ 58555505Sshinstatic const char * 586186119Sqinglihttp_parse_headerstring(const char *cp, char *obuf) 58755505Sshin{ 588186119Sqingli for (;;) { 589186119Sqingli switch (*cp) { 590186119Sqingli case 0: /* Unterminated string */ 59155505Sshin *obuf = 0; 59255505Sshin return (NULL); 59355505Sshin case '"': /* Ending quote */ 59455505Sshin *obuf = 0; 595121156Sume return (++cp); 59655505Sshin case '\\': 59755505Sshin if (*++cp == 0) { 59855505Sshin *obuf = 0; 59955505Sshin return (NULL); 60055505Sshin } 60155505Sshin /* FALLTHROUGH */ 60255505Sshin default: 60355505Sshin *obuf++ = *cp++; 60455505Sshin } 60555505Sshin } 60655505Sshin} 607259171Sae 60878064Sume/* Http auth challenge schemes */ 60978064Sumetypedef enum {HTTPAS_UNKNOWN, HTTPAS_BASIC,HTTPAS_DIGEST} http_auth_schemes_t; 61078064Sume 61178064Sume/* Data holder for a Basic or Digest challenge. */ 61278064Sumetypedef struct { 61378064Sume http_auth_schemes_t scheme; 61478064Sume char *realm; 61578064Sume char *qop; 616121156Sume char *nonce; 61778064Sume char *opaque; 61878064Sume char *algo; 61978064Sume int stale; 62078064Sume int nc; /* Nonce count */ 62178064Sume} http_auth_challenge_t; 62278064Sume 62378064Sumestatic void 62478064Sumeinit_http_auth_challenge(http_auth_challenge_t *b) 625122615Sume{ 626122615Sume b->scheme = HTTPAS_UNKNOWN; 627122615Sume b->realm = b->qop = b->nonce = b->opaque = b->algo = NULL; 62855505Sshin b->stale = b->nc = 0; 629259176Sae} 630259176Sae 631259176Saestatic void 63255505Sshinclean_http_auth_challenge(http_auth_challenge_t *b) 63355505Sshin{ 63455505Sshin if (b->realm) 63555505Sshin free(b->realm); 63655505Sshin if (b->qop) 63755505Sshin free(b->qop); 63855505Sshin if (b->nonce) 63955505Sshin free(b->nonce); 64055505Sshin if (b->opaque) 64155505Sshin free(b->opaque); 64255505Sshin if (b->algo) 643121156Sume free(b->algo); 644122615Sume init_http_auth_challenge(b); 64581366Ssumikawa} 64681366Ssumikawa 64781366Ssumikawa/* Data holder for an array of challenges offered in an http response. */ 648122615Sume#define MAX_CHALLENGES 10 649122615Sumetypedef struct { 650122615Sume http_auth_challenge_t *challenges[MAX_CHALLENGES]; 65181366Ssumikawa int count; /* Number of parsed challenges in the array */ 652288297Smelifaro int valid; /* We did parse an authenticate header */ 653288297Smelifaro} http_auth_challenges_t; 65466865Ssumikawa 65581366Ssumikawastatic void 65666865Ssumikawainit_http_auth_challenges(http_auth_challenges_t *cs) 65766865Ssumikawa{ 658253999Shrs int i; 65955505Sshin for (i = 0; i < MAX_CHALLENGES; i++) 660253970Shrs cs->challenges[i] = NULL; 66155505Sshin cs->count = cs->valid = 0; 66278064Sume} 66378064Sume 66478064Sumestatic void 66578064Sumeclean_http_auth_challenges(http_auth_challenges_t *cs) 66678064Sume{ 66778064Sume int i; 66878064Sume /* We rely on non-zero pointers being allocated, not on the count */ 66978064Sume for (i = 0; i < MAX_CHALLENGES; i++) { 67078064Sume if (cs->challenges[i] != NULL) { 67178064Sume clean_http_auth_challenge(cs->challenges[i]); 67278064Sume free(cs->challenges[i]); 67378064Sume } 67455505Sshin } 67578064Sume init_http_auth_challenges(cs); 67678064Sume} 67755505Sshin 678289677Seadler/* 679292333Smelifaro * Enumeration for lexical elements. Separators will be returned as their own 680292333Smelifaro * ascii value 681292333Smelifaro */ 682292333Smelifarotypedef enum {HTTPHL_WORD=256, HTTPHL_STRING=257, HTTPHL_END=258, 683292333Smelifaro HTTPHL_ERROR = 259} http_header_lex_t; 684292333Smelifaro 685292333Smelifaro/* 68655505Sshin * Determine what kind of token comes next and return possible value 687292333Smelifaro * in buf, which is supposed to have been allocated big enough by 688292333Smelifaro * caller. Advance input pointer and return element type. 689292333Smelifaro */ 690292333Smelifarostatic int 69178064Sumehttp_header_lex(const char **cpp, char *buf) 692292333Smelifaro{ 693292333Smelifaro size_t l; 694292333Smelifaro /* Eat initial whitespace */ 69578064Sume *cpp += strspn(*cpp, " \t"); 696292333Smelifaro if (**cpp == 0) 697292333Smelifaro return (HTTPHL_END); 698292333Smelifaro 699292333Smelifaro /* Separator ? */ 700292333Smelifaro if (**cpp == ',' || **cpp == '=') 701292333Smelifaro return (*((*cpp)++)); 702292333Smelifaro 703292333Smelifaro /* String ? */ 704292333Smelifaro if (**cpp == '"') { 705292333Smelifaro *cpp = http_parse_headerstring(++*cpp, buf); 706292333Smelifaro if (*cpp == NULL) 707292333Smelifaro return (HTTPHL_ERROR); 708292333Smelifaro return (HTTPHL_STRING); 709292333Smelifaro } 710292333Smelifaro 711292333Smelifaro /* Read other token, until separator or whitespace */ 712292333Smelifaro l = strcspn(*cpp, " \t,="); 713292333Smelifaro memcpy(buf, *cpp, l); 71455505Sshin buf[l] = 0; 71555505Sshin *cpp += l; 716292333Smelifaro return (HTTPHL_WORD); 717292333Smelifaro} 718292333Smelifaro 71962590Sitojun/* 72062590Sitojun * Read challenges from http xxx-authenticate header and accumulate them 72162590Sitojun * in the challenges list structure. 72262590Sitojun * 72362590Sitojun * Headers with multiple challenges are specified by rfc2617, but 724121156Sume * servers (ie: squid) often send them in separate headers instead, 725121156Sume * which in turn is forbidden by the http spec (multiple headers with 72662590Sitojun * the same name are only allowed for pure comma-separated lists, see 727287995Sdelphij * rfc2616 sec 4.2). 72862590Sitojun * 729121156Sume * We support both approaches anyway 73062590Sitojun */ 731121156Sumestatic int 732121156Sumehttp_parse_authenticate(const char *cp, http_auth_challenges_t *cs) 733121156Sume{ 734121156Sume int ret = -1; 735122615Sume http_header_lex_t lex; 736122615Sume char *key = malloc(strlen(cp) + 1); 737122615Sume char *value = malloc(strlen(cp) + 1); 738122615Sume char *buf = malloc(strlen(cp) + 1); 739122615Sume 74055505Sshin if (key == NULL || value == NULL || buf == NULL) { 741122615Sume fetch_syserr(); 74255505Sshin goto out; 74355505Sshin } 744122615Sume 74555505Sshin /* In any case we've seen the header and we set the valid bit */ 74655505Sshin cs->valid = 1; 74755505Sshin 74878064Sume /* Need word first */ 74978064Sume lex = http_header_lex(&cp, key); 75055505Sshin if (lex != HTTPHL_WORD) 75155505Sshin goto out; 75255505Sshin 753125675Ssumikawa /* Loop on challenges */ 75455505Sshin for (; cs->count < MAX_CHALLENGES; cs->count++) { 75555505Sshin cs->challenges[cs->count] = 75655505Sshin malloc(sizeof(http_auth_challenge_t)); 75755505Sshin if (cs->challenges[cs->count] == NULL) { 75855505Sshin fetch_syserr(); 75955505Sshin goto out; 760259169Sae } 76155505Sshin init_http_auth_challenge(cs->challenges[cs->count]); 76255505Sshin if (!strcasecmp(key, "basic")) { 76355505Sshin cs->challenges[cs->count]->scheme = HTTPAS_BASIC; 76455505Sshin } else if (!strcasecmp(key, "digest")) { 76555505Sshin cs->challenges[cs->count]->scheme = HTTPAS_DIGEST; 76655505Sshin } else { 76755505Sshin cs->challenges[cs->count]->scheme = HTTPAS_UNKNOWN; 76855505Sshin /* 76955505Sshin * Continue parsing as basic or digest may 77055505Sshin * follow, and the syntax is the same for 77155505Sshin * all. We'll just ignore this one when 77262590Sitojun * looking at the list 77362590Sitojun */ 77455505Sshin } 77555505Sshin 77655505Sshin /* Loop on attributes */ 77755505Sshin for (;;) { 77855505Sshin /* Key */ 77955505Sshin lex = http_header_lex(&cp, key); 78055505Sshin if (lex != HTTPHL_WORD) 78155505Sshin goto out; 78255505Sshin 783217140Sdelphij /* Equal sign */ 78455505Sshin lex = http_header_lex(&cp, buf); 785121156Sume if (lex != '=') 78655505Sshin goto out; 787219819Sjeff 788217140Sdelphij /* Value */ 789217140Sdelphij lex = http_header_lex(&cp, value); 790219819Sjeff if (lex != HTTPHL_WORD && lex != HTTPHL_STRING) 791219819Sjeff goto out; 792219819Sjeff 793219819Sjeff if (!strcasecmp(key, "realm")) 794121156Sume cs->challenges[cs->count]->realm = 79555505Sshin strdup(value); 796121156Sume else if (!strcasecmp(key, "qop")) 79755505Sshin cs->challenges[cs->count]->qop = 79855505Sshin strdup(value); 799287097Shrs else if (!strcasecmp(key, "nonce")) 800259169Sae cs->challenges[cs->count]->nonce = 80155505Sshin strdup(value); 80255505Sshin else if (!strcasecmp(key, "opaque")) 80355505Sshin cs->challenges[cs->count]->opaque = 80455505Sshin strdup(value); 805121156Sume else if (!strcasecmp(key, "algorithm")) 80655505Sshin cs->challenges[cs->count]->algo = 80755505Sshin strdup(value); 80855505Sshin else if (!strcasecmp(key, "stale")) 80955505Sshin cs->challenges[cs->count]->stale = 810121156Sume strcasecmp(value, "no"); 81155505Sshin /* Else ignore unknown attributes */ 81255505Sshin 81355505Sshin /* Comma or Next challenge or End */ 81455505Sshin lex = http_header_lex(&cp, key); 815287097Shrs /* 81655505Sshin * If we get a word here, this is the beginning of the 81755505Sshin * next challenge. Break the attributes loop 818122615Sume */ 819122615Sume if (lex == HTTPHL_WORD) 82078064Sume break; 821122615Sume 822122615Sume if (lex == HTTPHL_END) { 823122615Sume /* End while looking for ',' is normal exit */ 82462590Sitojun cs->count++; 825122615Sume ret = 0; 82662590Sitojun goto out; 827122615Sume } 82855505Sshin /* Anything else is an error */ 82955505Sshin if (lex != ',') 83055505Sshin goto out; 831287097Shrs 832259169Sae } /* End attributes loop */ 83355505Sshin } /* End challenge loop */ 83455505Sshin 83555505Sshin /* 83655505Sshin * Challenges max count exceeded. This really can't happen 83755505Sshin * with normal data, something's fishy -> error 83855505Sshin */ 83955505Sshin 84055505Sshinout: 84155505Sshin if (key) 84255505Sshin free(key); 84355505Sshin if (value) 84455505Sshin free(value); 84555505Sshin if (buf) 84655505Sshin free(buf); 84755505Sshin return (ret); 84855505Sshin} 84955505Sshin 85055505Sshin 85155505Sshin/* 85255505Sshin * Parse a last-modified header 853122615Sume */ 854122615Sumestatic int 855122615Sumehttp_parse_mtime(const char *p, time_t *mtime) 856122615Sume{ 857186500Sqingli char locale[64], *r; 858151473Ssuz struct tm tm; 85962590Sitojun 86062590Sitojun strncpy(locale, setlocale(LC_TIME, NULL), sizeof(locale)); 861124241Ssuz setlocale(LC_TIME, "C"); 86262590Sitojun r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 863151473Ssuz /* XXX should add support for date-2 and date-3 */ 86455505Sshin setlocale(LC_TIME, locale); 86555505Sshin if (r == NULL) 86655505Sshin return (-1); 86755505Sshin DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d " 86855505Sshin "%02d:%02d:%02d]\n", 86955505Sshin tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 87055505Sshin tm.tm_hour, tm.tm_min, tm.tm_sec)); 871151473Ssuz *mtime = timegm(&tm); 87262590Sitojun return (0); 87355505Sshin} 874151473Ssuz 87555505Sshin/* 87655505Sshin * Parse a content-length header 87755505Sshin */ 87855505Sshinstatic int 87955505Sshinhttp_parse_length(const char *p, off_t *length) 88055505Sshin{ 88155505Sshin off_t len; 88255505Sshin 883121156Sume for (len = 0; *p && isdigit((unsigned char)*p); ++p) 884121156Sume len = len * 10 + (*p - '0'); 88555505Sshin if (*p) 88655505Sshin return (-1); 88755505Sshin DEBUG(fprintf(stderr, "content length: [%lld]\n", 88855505Sshin (long long)len)); 88955505Sshin *length = len; 89055505Sshin return (0); 89155505Sshin} 89255505Sshin 89355505Sshin/* 89455505Sshin * Parse a content-range header 89555505Sshin */ 896287097Shrsstatic int 897259169Saehttp_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) 89855505Sshin{ 89955505Sshin off_t first, last, len; 90062590Sitojun 90162590Sitojun if (strncasecmp(p, "bytes ", 6) != 0) 90278064Sume return (-1); 90378064Sume p += 6; 90478064Sume if (*p == '*') { 90555505Sshin first = last = -1; 90655505Sshin ++p; 907121156Sume } else { 908121156Sume for (first = 0; *p && isdigit((unsigned char)*p); ++p) 90955505Sshin first = first * 10 + *p - '0'; 91055505Sshin if (*p != '-') 911121156Sume return (-1); 91255505Sshin for (last = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 913121156Sume last = last * 10 + *p - '0'; 914121156Sume } 915122615Sume if (first > last || *p != '/') 91662590Sitojun return (-1); 91762590Sitojun for (len = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 918122615Sume len = len * 10 + *p - '0'; 91962590Sitojun if (*p || len < last - first + 1) 92062590Sitojun return (-1); 92162590Sitojun if (first == -1) { 92262590Sitojun DEBUG(fprintf(stderr, "content range: [*/%lld]\n", 92362590Sitojun (long long)len)); 92462590Sitojun *length = 0; 92562590Sitojun } else { 92662590Sitojun DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n", 92762590Sitojun (long long)first, (long long)last, (long long)len)); 92862590Sitojun *length = last - first + 1; 92962590Sitojun } 93062590Sitojun *offset = first; 93162590Sitojun *size = len; 93262590Sitojun return (0); 93362590Sitojun} 93462590Sitojun 93562590Sitojun 936151468Ssuz/***************************************************************************** 937151468Ssuz * Helper functions for authorization 938151468Ssuz */ 939151468Ssuz 940151468Ssuz/* 941151468Ssuz * Base64 encoding 942151468Ssuz */ 943151468Ssuzstatic char * 944151468Ssuzhttp_base64(const char *src) 945151468Ssuz{ 946151468Ssuz static const char base64[] = 947151468Ssuz "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 948151468Ssuz "abcdefghijklmnopqrstuvwxyz" 949151468Ssuz "0123456789+/"; 950151468Ssuz char *str, *dst; 951151468Ssuz size_t l; 952151468Ssuz int t, r; 953151468Ssuz 954151468Ssuz l = strlen(src); 955151468Ssuz if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL) 956151468Ssuz return (NULL); 957151474Ssuz dst = str; 95862590Sitojun r = 0; 959118498Sume 960118498Sume while (l >= 3) { 961118498Sume t = (src[0] << 16) | (src[1] << 8) | src[2]; 962197138Shrs dst[0] = base64[(t >> 18) & 0x3f]; 963197138Shrs dst[1] = base64[(t >> 12) & 0x3f]; 964197138Shrs dst[2] = base64[(t >> 6) & 0x3f]; 965245230Sume dst[3] = base64[(t >> 0) & 0x3f]; 966245230Sume src += 3; l -= 3; 967245230Sume dst += 4; r += 4; 968151468Ssuz } 969151468Ssuz 970151468Ssuz switch (l) { 97162590Sitojun case 2: 97262590Sitojun t = (src[0] << 16) | (src[1] << 8); 973151468Ssuz dst[0] = base64[(t >> 18) & 0x3f]; 974151468Ssuz dst[1] = base64[(t >> 12) & 0x3f]; 975121156Sume dst[2] = base64[(t >> 6) & 0x3f]; 97662590Sitojun dst[3] = '='; 97762590Sitojun dst += 4; 978151468Ssuz r += 4; 97962590Sitojun break; 98062590Sitojun case 1: 981121162Sume t = src[0] << 16; 982121162Sume dst[0] = base64[(t >> 18) & 0x3f]; 983121162Sume dst[1] = base64[(t >> 12) & 0x3f]; 984121162Sume dst[2] = dst[3] = '='; 985121162Sume dst += 4; 986151468Ssuz r += 4; 987151468Ssuz break; 988151468Ssuz case 0: 989151468Ssuz break; 99055505Sshin } 991121471Sume 99255505Sshin *dst = 0; 99355505Sshin return (str); 994121156Sume} 99555505Sshin 99662590Sitojun 99778064Sume/* 99878064Sume * Extract authorization parameters from environment value. 99978064Sume * The value is like scheme:realm:user:pass 100078064Sume */ 100178064Sumetypedef struct { 100278064Sume char *scheme; 100378064Sume char *realm; 1004121156Sume char *user; 100578064Sume char *password; 100678064Sume} http_auth_params_t; 100778064Sume 100878064Sumestatic void 100978064Sumeinit_http_auth_params(http_auth_params_t *s) 101078064Sume{ 101178064Sume s->scheme = s->realm = s->user = s->password = 0; 101278064Sume} 101378064Sume 101478064Sumestatic void 101578064Sumeclean_http_auth_params(http_auth_params_t *s) 101678064Sume{ 1017151472Ssuz if (s->scheme) 1018151472Ssuz free(s->scheme); 101978064Sume if (s->realm) 102078064Sume free(s->realm); 102178064Sume if (s->user) 102278064Sume free(s->user); 102378064Sume if (s->password) 102478064Sume free(s->password); 102562590Sitojun init_http_auth_params(s); 102662590Sitojun} 1027151474Ssuz 1028151474Ssuzstatic int 1029151474Ssuzhttp_authfromenv(const char *p, http_auth_params_t *parms) 1030151474Ssuz{ 1031118498Sume int ret = -1; 1032118498Sume char *v, *ve; 1033118498Sume char *str = strdup(p); 1034118498Sume 1035118498Sume if (str == NULL) { 1036118498Sume fetch_syserr(); 1037197138Shrs return (-1); 1038197138Shrs } 1039197138Shrs v = str; 1040197138Shrs 1041245230Sume if ((ve = strchr(v, ':')) == NULL) 1042245230Sume goto out; 1043245230Sume 1044245230Sume *ve = 0; 1045122615Sume if ((parms->scheme = strdup(v)) == NULL) { 104662590Sitojun fetch_syserr(); 104755505Sshin goto out; 1048121156Sume } 104955505Sshin v = ve + 1; 105055505Sshin 105155505Sshin if ((ve = strchr(v, ':')) == NULL) 105278064Sume goto out; 105378064Sume 105478064Sume *ve = 0; 105578064Sume if ((parms->realm = strdup(v)) == NULL) { 1056287097Shrs fetch_syserr(); 105755505Sshin goto out; 105855505Sshin } 105978064Sume v = ve + 1; 106078064Sume 106178064Sume if ((ve = strchr(v, ':')) == NULL) 106278064Sume goto out; 1063253999Shrs 106478064Sume *ve = 0; 106578064Sume if ((parms->user = strdup(v)) == NULL) { 106678064Sume fetch_syserr(); 106778064Sume goto out; 106878064Sume } 1069151472Ssuz v = ve + 1; 1070151472Ssuz 107178064Sume 107278064Sume if ((parms->password = strdup(v)) == NULL) { 1073121156Sume fetch_syserr(); 107478064Sume goto out; 107578064Sume } 107678064Sume ret = 0; 107778064Sumeout: 107878064Sume if (ret == -1) 107978064Sume clean_http_auth_params(parms); 108078064Sume if (str) 108178064Sume free(str); 108278064Sume return (ret); 108378064Sume} 108478064Sume 108578064Sume 108678064Sume/* 1087121156Sume * Digest response: the code to compute the digest is taken from the 108878064Sume * sample implementation in RFC2616 1089121156Sume */ 109078064Sume#define IN const 1091121156Sume#define OUT 109278064Sume 1093121156Sume#define HASHLEN 16 1094121156Sumetypedef char HASH[HASHLEN]; 109578064Sume#define HASHHEXLEN 32 109678064Sumetypedef char HASHHEX[HASHHEXLEN+1]; 1097121156Sume 1098253999Shrsstatic const char *hexchars = "0123456789abcdef"; 109978064Sumestatic void 110078064SumeCvtHex(IN HASH Bin, OUT HASHHEX Hex) 110178064Sume{ 110278064Sume unsigned short i; 1103253970Shrs unsigned char j; 110478064Sume 110578064Sume for (i = 0; i < HASHLEN; i++) { 110655505Sshin j = (Bin[i] >> 4) & 0xf; 110755505Sshin Hex[i*2] = hexchars[j]; 1108287097Shrs j = Bin[i] & 0xf; 110955505Sshin Hex[i*2+1] = hexchars[j]; 111055505Sshin }; 111178064Sume Hex[HASHHEXLEN] = '\0'; 111278064Sume}; 111378064Sume 111478064Sume/* calculate H(A1) as per spec */ 111578064Sumestatic void 1116253999ShrsDigestCalcHA1( 111778064Sume IN char * pszAlg, 111878064Sume IN char * pszUserName, 111978064Sume IN char * pszRealm, 112078064Sume IN char * pszPassword, 112178064Sume IN char * pszNonce, 112278064Sume IN char * pszCNonce, 112378064Sume OUT HASHHEX SessionKey 112478064Sume ) 112578064Sume{ 112678064Sume MD5_CTX Md5Ctx; 1127121156Sume HASH HA1; 112878064Sume 112978064Sume MD5Init(&Md5Ctx); 113078064Sume MD5Update(&Md5Ctx, pszUserName, strlen(pszUserName)); 113178064Sume MD5Update(&Md5Ctx, ":", 1); 113278064Sume MD5Update(&Md5Ctx, pszRealm, strlen(pszRealm)); 113378064Sume MD5Update(&Md5Ctx, ":", 1); 113478064Sume MD5Update(&Md5Ctx, pszPassword, strlen(pszPassword)); 113578064Sume MD5Final(HA1, &Md5Ctx); 113678064Sume if (strcasecmp(pszAlg, "md5-sess") == 0) { 113778064Sume 113878064Sume MD5Init(&Md5Ctx); 113978064Sume MD5Update(&Md5Ctx, HA1, HASHLEN); 114078064Sume MD5Update(&Md5Ctx, ":", 1); 114178064Sume MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); 114278064Sume MD5Update(&Md5Ctx, ":", 1); 114378064Sume MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); 114478064Sume MD5Final(HA1, &Md5Ctx); 1145121156Sume }; 114678064Sume CvtHex(HA1, SessionKey); 1147253999Shrs} 114878064Sume 114978064Sume/* calculate request-digest/response-digest as per HTTP Digest spec */ 115078064Sumestatic void 115178064SumeDigestCalcResponse( 115278064Sume IN HASHHEX HA1, /* H(A1) */ 1153121156Sume IN char * pszNonce, /* nonce from server */ 1154121156Sume IN char * pszNonceCount, /* 8 hex digits */ 1155121156Sume IN char * pszCNonce, /* client nonce */ 1156121156Sume IN char * pszQop, /* qop-value: "", "auth", "auth-int" */ 115778064Sume IN char * pszMethod, /* method from the request */ 1158121156Sume IN char * pszDigestUri, /* requested URL */ 115978064Sume IN HASHHEX HEntity, /* H(entity body) if qop="auth-int" */ 1160121156Sume OUT HASHHEX Response /* request-digest or response-digest */ 116178064Sume ) 1162121156Sume{ 116378064Sume/* DEBUG(fprintf(stderr, 116478064Sume "Calc: HA1[%s] Nonce[%s] qop[%s] method[%s] URI[%s]\n", 116578064Sume HA1, pszNonce, pszQop, pszMethod, pszDigestUri));*/ 1166122615Sume MD5_CTX Md5Ctx; 116778064Sume HASH HA2; 116878064Sume HASH RespHash; 116978064Sume HASHHEX HA2Hex; 1170122615Sume 117178064Sume // calculate H(A2) 117278064Sume MD5Init(&Md5Ctx); 1173253970Shrs MD5Update(&Md5Ctx, pszMethod, strlen(pszMethod)); 117478064Sume MD5Update(&Md5Ctx, ":", 1); 1175253970Shrs MD5Update(&Md5Ctx, pszDigestUri, strlen(pszDigestUri)); 117678064Sume if (strcasecmp(pszQop, "auth-int") == 0) { 117778064Sume MD5Update(&Md5Ctx, ":", 1); 117878064Sume MD5Update(&Md5Ctx, HEntity, HASHHEXLEN); 117978064Sume }; 118078064Sume MD5Final(HA2, &Md5Ctx); 118178064Sume CvtHex(HA2, HA2Hex); 118278064Sume 118378064Sume // calculate response 118478064Sume MD5Init(&Md5Ctx); 118578064Sume MD5Update(&Md5Ctx, HA1, HASHHEXLEN); 118678064Sume MD5Update(&Md5Ctx, ":", 1); 118778064Sume MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); 1188122615Sume MD5Update(&Md5Ctx, ":", 1); 118978064Sume if (*pszQop) { 119078064Sume MD5Update(&Md5Ctx, pszNonceCount, strlen(pszNonceCount)); 119178064Sume MD5Update(&Md5Ctx, ":", 1); 119278064Sume MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); 119378064Sume MD5Update(&Md5Ctx, ":", 1); 119478064Sume MD5Update(&Md5Ctx, pszQop, strlen(pszQop)); 119578064Sume MD5Update(&Md5Ctx, ":", 1); 119678064Sume }; 119778064Sume MD5Update(&Md5Ctx, HA2Hex, HASHHEXLEN); 119878064Sume MD5Final(RespHash, &Md5Ctx); 1199121156Sume CvtHex(RespHash, Response); 1200121156Sume} 120178064Sume 1202121156Sume/* 120378064Sume * Generate/Send a Digest authorization header 120478064Sume * This looks like: [Proxy-]Authorization: credentials 120578064Sume * 120678064Sume * credentials = "Digest" digest-response 120778064Sume * digest-response = 1#( username | realm | nonce | digest-uri 120878064Sume * | response | [ algorithm ] | [cnonce] | 120978064Sume * [opaque] | [message-qop] | 121078064Sume * [nonce-count] | [auth-param] ) 121178064Sume * username = "username" "=" username-value 121278064Sume * username-value = quoted-string 121378064Sume * digest-uri = "uri" "=" digest-uri-value 121478064Sume * digest-uri-value = request-uri ; As specified by HTTP/1.1 121578064Sume * message-qop = "qop" "=" qop-value 121678064Sume * cnonce = "cnonce" "=" cnonce-value 121778064Sume * cnonce-value = nonce-value 121878064Sume * nonce-count = "nc" "=" nc-value 121978064Sume * nc-value = 8LHEX 122055505Sshin * response = "response" "=" request-digest 122155505Sshin * request-digest = <"> 32LHEX <"> 1222287097Shrs */ 122355505Sshinstatic int 122455505Sshinhttp_digest_auth(conn_t *conn, const char *hdr, http_auth_challenge_t *c, 122555505Sshin http_auth_params_t *parms, struct url *url) 122655505Sshin{ 122755505Sshin int r; 122855505Sshin char noncecount[10]; 122955505Sshin char cnonce[40]; 1230121156Sume char *options = 0; 123155505Sshin 1232121156Sume if (!c->realm || !c->nonce) { 123355505Sshin DEBUG(fprintf(stderr, "realm/nonce not set in challenge\n")); 123455505Sshin return(-1); 1235287097Shrs } 123655505Sshin if (!c->algo) 123755505Sshin c->algo = strdup(""); 123855505Sshin 123955505Sshin if (asprintf(&options, "%s%s%s%s", 124055505Sshin *c->algo? ",algorithm=" : "", c->algo, 124155505Sshin c->opaque? ",opaque=" : "", c->opaque?c->opaque:"")== -1) 124255505Sshin return (-1); 1243121156Sume 124455505Sshin if (!c->qop) { 1245121156Sume c->qop = strdup(""); 124662590Sitojun *noncecount = 0; 124762590Sitojun *cnonce = 0; 124855505Sshin } else { 124955505Sshin c->nc++; 1250287097Shrs sprintf(noncecount, "%08x", c->nc); 125155505Sshin /* We don't try very hard with the cnonce ... */ 125255505Sshin sprintf(cnonce, "%x%lx", getpid(), (unsigned long)time(0)); 125355505Sshin } 125455505Sshin 125555505Sshin HASHHEX HA1; 125662590Sitojun DigestCalcHA1(c->algo, parms->user, c->realm, 125762590Sitojun parms->password, c->nonce, cnonce, HA1); 1258121156Sume DEBUG(fprintf(stderr, "HA1: [%s]\n", HA1)); 125962590Sitojun HASHHEX digest; 1260121156Sume DigestCalcResponse(HA1, c->nonce, noncecount, cnonce, c->qop, 126162590Sitojun "GET", url->doc, "", digest); 126262590Sitojun 126355505Sshin if (c->qop[0]) { 126455505Sshin r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," 126562590Sitojun "nonce=\"%s\",uri=\"%s\",response=\"%s\"," 126662590Sitojun "qop=\"auth\", cnonce=\"%s\", nc=%s%s", 1267259169Sae hdr, parms->user, c->realm, 126862590Sitojun c->nonce, url->doc, digest, 126962590Sitojun cnonce, noncecount, options); 127062590Sitojun } else { 127162590Sitojun r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," 127262590Sitojun "nonce=\"%s\",uri=\"%s\",response=\"%s\"%s", 127362590Sitojun hdr, parms->user, c->realm, 127462590Sitojun c->nonce, url->doc, digest, options); 127562590Sitojun } 127662590Sitojun if (options) 127762590Sitojun free(options); 127862590Sitojun return (r); 127962590Sitojun} 128062590Sitojun 128162590Sitojun/* 1282121156Sume * Encode username and password 128362590Sitojun */ 128462590Sitojunstatic int 128562590Sitojunhttp_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd) 1286121156Sume{ 128762590Sitojun char *upw, *auth; 128862590Sitojun int r; 128962590Sitojun 129062590Sitojun DEBUG(fprintf(stderr, "basic: usr: [%s]\n", usr)); 129162590Sitojun DEBUG(fprintf(stderr, "basic: pwd: [%s]\n", pwd)); 129262590Sitojun if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 129362590Sitojun return (-1); 129462590Sitojun auth = http_base64(upw); 129562590Sitojun free(upw); 129662590Sitojun if (auth == NULL) 129762590Sitojun return (-1); 129862590Sitojun r = http_cmd(conn, "%s: Basic %s", hdr, auth); 129962590Sitojun free(auth); 130062590Sitojun return (r); 1301121156Sume} 130262590Sitojun 130362590Sitojun/* 1304121156Sume * Chose the challenge to answer and call the appropriate routine to 130562590Sitojun * produce the header. 130662590Sitojun */ 130762590Sitojunstatic int 130862590Sitojunhttp_authorize(conn_t *conn, const char *hdr, http_auth_challenges_t *cs, 130962590Sitojun http_auth_params_t *parms, struct url *url) 131062590Sitojun{ 131162590Sitojun http_auth_challenge_t *basic = NULL; 131262590Sitojun http_auth_challenge_t *digest = NULL; 131362590Sitojun int i; 131462590Sitojun 131562590Sitojun /* If user or pass are null we're not happy */ 131662590Sitojun if (!parms->user || !parms->password) { 131762590Sitojun DEBUG(fprintf(stderr, "NULL usr or pass\n")); 131862590Sitojun return (-1); 131955505Sshin } 1320259169Sae 132155505Sshin /* Look for a Digest and a Basic challenge */ 132255505Sshin for (i = 0; i < cs->count; i++) { 132355505Sshin if (cs->challenges[i]->scheme == HTTPAS_BASIC) 132455505Sshin basic = cs->challenges[i]; 132555505Sshin if (cs->challenges[i]->scheme == HTTPAS_DIGEST) 1326121156Sume digest = cs->challenges[i]; 1327121156Sume } 132855505Sshin 132955505Sshin /* Error if "Digest" was specified and there is no Digest challenge */ 133055505Sshin if (!digest && (parms->scheme && 133155505Sshin !strcasecmp(parms->scheme, "digest"))) { 133255505Sshin DEBUG(fprintf(stderr, 133355505Sshin "Digest auth in env, not supported by peer\n")); 133455505Sshin return (-1); 133555505Sshin } 1336121156Sume /* 1337121156Sume * If "basic" was specified in the environment, or there is no Digest 1338121156Sume * challenge, do the basic thing. Don't need a challenge for this, 1339121156Sume * so no need to check basic!=NULL 134055505Sshin */ 134155505Sshin if (!digest || (parms->scheme && !strcasecmp(parms->scheme,"basic"))) 134255505Sshin return (http_basic_auth(conn,hdr,parms->user,parms->password)); 1343121156Sume 1344121156Sume /* Else, prefer digest. We just checked that it's not NULL */ 1345121156Sume return (http_digest_auth(conn, hdr, digest, parms, url)); 1346121156Sume} 134755505Sshin 134855505Sshin/***************************************************************************** 134955505Sshin * Helper functions for connecting to a server or proxy 1350121156Sume */ 1351121156Sume 1352121156Sume/* 1353121156Sume * Connect to the correct HTTP server or proxy. 135455505Sshin */ 1355121156Sumestatic conn_t * 135655505Sshinhttp_connect(struct url *URL, struct url *purl, const char *flags) 135755505Sshin{ 135855505Sshin conn_t *conn; 135955505Sshin int verbose; 136055505Sshin int af, val; 136155505Sshin 136255505Sshin#ifdef INET6 136355505Sshin af = AF_UNSPEC; 136455505Sshin#else 1365259169Sae af = AF_INET; 136655505Sshin#endif 136755505Sshin 136855505Sshin verbose = CHECK_FLAG('v'); 136955505Sshin if (CHECK_FLAG('4')) 1370253999Shrs af = AF_INET; 137155505Sshin#ifdef INET6 1372253999Shrs else if (CHECK_FLAG('6')) 137355505Sshin af = AF_INET6; 1374186119Sqingli#endif 1375186119Sqingli 1376 if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) { 1377 URL = purl; 1378 } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 1379 /* can't talk http to an ftp server */ 1380 /* XXX should set an error code */ 1381 return (NULL); 1382 } 1383 1384 if ((conn = fetch_connect(URL->host, URL->port, af, verbose)) == NULL) 1385 /* fetch_connect() has already set an error code */ 1386 return (NULL); 1387 if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && 1388 fetch_ssl(conn, verbose) == -1) { 1389 fetch_close(conn); 1390 /* grrr */ 1391 errno = EAUTH; 1392 fetch_syserr(); 1393 return (NULL); 1394 } 1395 1396 val = 1; 1397 setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val)); 1398 1399 return (conn); 1400} 1401 1402static struct url * 1403http_get_proxy(struct url * url, const char *flags) 1404{ 1405 struct url *purl; 1406 char *p; 1407 1408 if (flags != NULL && strchr(flags, 'd') != NULL) 1409 return (NULL); 1410 if (fetch_no_proxy_match(url->host)) 1411 return (NULL); 1412 if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1413 *p && (purl = fetchParseURL(p))) { 1414 if (!*purl->scheme) 1415 strcpy(purl->scheme, SCHEME_HTTP); 1416 if (!purl->port) 1417 purl->port = fetch_default_proxy_port(purl->scheme); 1418 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 1419 return (purl); 1420 fetchFreeURL(purl); 1421 } 1422 return (NULL); 1423} 1424 1425static void 1426http_print_html(FILE *out, FILE *in) 1427{ 1428 size_t len; 1429 char *line, *p, *q; 1430 int comment, tag; 1431 1432 comment = tag = 0; 1433 while ((line = fgetln(in, &len)) != NULL) { 1434 while (len && isspace((unsigned char)line[len - 1])) 1435 --len; 1436 for (p = q = line; q < line + len; ++q) { 1437 if (comment && *q == '-') { 1438 if (q + 2 < line + len && 1439 strcmp(q, "-->") == 0) { 1440 tag = comment = 0; 1441 q += 2; 1442 } 1443 } else if (tag && !comment && *q == '>') { 1444 p = q + 1; 1445 tag = 0; 1446 } else if (!tag && *q == '<') { 1447 if (q > p) 1448 fwrite(p, q - p, 1, out); 1449 tag = 1; 1450 if (q + 3 < line + len && 1451 strcmp(q, "<!--") == 0) { 1452 comment = 1; 1453 q += 3; 1454 } 1455 } 1456 } 1457 if (!tag && q > p) 1458 fwrite(p, q - p, 1, out); 1459 fputc('\n', out); 1460 } 1461} 1462 1463 1464/***************************************************************************** 1465 * Core 1466 */ 1467 1468/* 1469 * Send a request and process the reply 1470 * 1471 * XXX This function is way too long, the do..while loop should be split 1472 * XXX off into a separate function. 1473 */ 1474FILE * 1475http_request(struct url *URL, const char *op, struct url_stat *us, 1476 struct url *purl, const char *flags) 1477{ 1478 char timebuf[80]; 1479 char hbuf[MAXHOSTNAMELEN + 7], *host; 1480 conn_t *conn; 1481 struct url *url, *new; 1482 int chunked, direct, ims, noredirect, verbose; 1483 int e, i, n, val; 1484 off_t offset, clength, length, size; 1485 time_t mtime; 1486 const char *p; 1487 FILE *f; 1488 hdr_t h; 1489 struct tm *timestruct; 1490 http_headerbuf_t headerbuf; 1491 http_auth_challenges_t server_challenges; 1492 http_auth_challenges_t proxy_challenges; 1493 1494 /* The following calls don't allocate anything */ 1495 init_http_headerbuf(&headerbuf); 1496 init_http_auth_challenges(&server_challenges); 1497 init_http_auth_challenges(&proxy_challenges); 1498 1499 direct = CHECK_FLAG('d'); 1500 noredirect = CHECK_FLAG('A'); 1501 verbose = CHECK_FLAG('v'); 1502 ims = CHECK_FLAG('i'); 1503 1504 if (direct && purl) { 1505 fetchFreeURL(purl); 1506 purl = NULL; 1507 } 1508 1509 /* try the provided URL first */ 1510 url = URL; 1511 1512 /* if the A flag is set, we only get one try */ 1513 n = noredirect ? 1 : MAX_REDIRECT; 1514 i = 0; 1515 1516 e = HTTP_PROTOCOL_ERROR; 1517 do { 1518 new = NULL; 1519 chunked = 0; 1520 offset = 0; 1521 clength = -1; 1522 length = -1; 1523 size = -1; 1524 mtime = 0; 1525 1526 /* check port */ 1527 if (!url->port) 1528 url->port = fetch_default_port(url->scheme); 1529 1530 /* were we redirected to an FTP URL? */ 1531 if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) { 1532 if (strcmp(op, "GET") == 0) 1533 return (ftp_request(url, "RETR", us, purl, flags)); 1534 else if (strcmp(op, "HEAD") == 0) 1535 return (ftp_request(url, "STAT", us, purl, flags)); 1536 } 1537 1538 /* connect to server or proxy */ 1539 if ((conn = http_connect(url, purl, flags)) == NULL) 1540 goto ouch; 1541 1542 host = url->host; 1543#ifdef INET6 1544 if (strchr(url->host, ':')) { 1545 snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 1546 host = hbuf; 1547 } 1548#endif 1549 if (url->port != fetch_default_port(url->scheme)) { 1550 if (host != hbuf) { 1551 strcpy(hbuf, host); 1552 host = hbuf; 1553 } 1554 snprintf(hbuf + strlen(hbuf), 1555 sizeof(hbuf) - strlen(hbuf), ":%d", url->port); 1556 } 1557 1558 /* send request */ 1559 if (verbose) 1560 fetch_info("requesting %s://%s%s", 1561 url->scheme, host, url->doc); 1562 if (purl) { 1563 http_cmd(conn, "%s %s://%s%s HTTP/1.1", 1564 op, url->scheme, host, url->doc); 1565 } else { 1566 http_cmd(conn, "%s %s HTTP/1.1", 1567 op, url->doc); 1568 } 1569 1570 if (ims && url->ims_time) { 1571 timestruct = gmtime((time_t *)&url->ims_time); 1572 (void)strftime(timebuf, 80, "%a, %d %b %Y %T GMT", 1573 timestruct); 1574 if (verbose) 1575 fetch_info("If-Modified-Since: %s", timebuf); 1576 http_cmd(conn, "If-Modified-Since: %s", timebuf); 1577 } 1578 /* virtual host */ 1579 http_cmd(conn, "Host: %s", host); 1580 1581 /* 1582 * Proxy authorization: we only send auth after we received 1583 * a 407 error. We do not first try basic anyway (changed 1584 * when support was added for digest-auth) 1585 */ 1586 if (purl && proxy_challenges.valid) { 1587 http_auth_params_t aparams; 1588 init_http_auth_params(&aparams); 1589 if (*purl->user || *purl->pwd) { 1590 aparams.user = purl->user ? 1591 strdup(purl->user) : strdup(""); 1592 aparams.password = purl->pwd? 1593 strdup(purl->pwd) : strdup(""); 1594 } else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && 1595 *p != '\0') { 1596 if (http_authfromenv(p, &aparams) < 0) { 1597 http_seterr(HTTP_NEED_PROXY_AUTH); 1598 goto ouch; 1599 } 1600 } 1601 http_authorize(conn, "Proxy-Authorization", 1602 &proxy_challenges, &aparams, url); 1603 clean_http_auth_params(&aparams); 1604 } 1605 1606 /* 1607 * Server authorization: we never send "a priori" 1608 * Basic auth, which used to be done if user/pass were 1609 * set in the url. This would be weird because we'd send the 1610 * password in the clear even if Digest is finally to be 1611 * used (it would have made more sense for the 1612 * pre-digest version to do this when Basic was specified 1613 * in the environment) 1614 */ 1615 if (server_challenges.valid) { 1616 http_auth_params_t aparams; 1617 init_http_auth_params(&aparams); 1618 if (*url->user || *url->pwd) { 1619 aparams.user = url->user ? 1620 strdup(url->user) : strdup(""); 1621 aparams.password = url->pwd ? 1622 strdup(url->pwd) : strdup(""); 1623 } else if ((p = getenv("HTTP_AUTH")) != NULL && 1624 *p != '\0') { 1625 if (http_authfromenv(p, &aparams) < 0) { 1626 http_seterr(HTTP_NEED_AUTH); 1627 goto ouch; 1628 } 1629 } else if (fetchAuthMethod && 1630 fetchAuthMethod(url) == 0) { 1631 aparams.user = url->user ? 1632 strdup(url->user) : strdup(""); 1633 aparams.password = url->pwd ? 1634 strdup(url->pwd) : strdup(""); 1635 } else { 1636 http_seterr(HTTP_NEED_AUTH); 1637 goto ouch; 1638 } 1639 http_authorize(conn, "Authorization", 1640 &server_challenges, &aparams, url); 1641 clean_http_auth_params(&aparams); 1642 } 1643 1644 /* other headers */ 1645 if ((p = getenv("HTTP_REFERER")) != NULL && *p != '\0') { 1646 if (strcasecmp(p, "auto") == 0) 1647 http_cmd(conn, "Referer: %s://%s%s", 1648 url->scheme, host, url->doc); 1649 else 1650 http_cmd(conn, "Referer: %s", p); 1651 } 1652 if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0') 1653 http_cmd(conn, "User-Agent: %s", p); 1654 else 1655 http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname()); 1656 if (url->offset > 0) 1657 http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset); 1658 http_cmd(conn, "Connection: close"); 1659 http_cmd(conn, ""); 1660 1661 /* 1662 * Force the queued request to be dispatched. Normally, one 1663 * would do this with shutdown(2) but squid proxies can be 1664 * configured to disallow such half-closed connections. To 1665 * be compatible with such configurations, fiddle with socket 1666 * options to force the pending data to be written. 1667 */ 1668 val = 0; 1669 setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, 1670 sizeof(val)); 1671 val = 1; 1672 setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val, 1673 sizeof(val)); 1674 1675 /* get reply */ 1676 switch (http_get_reply(conn)) { 1677 case HTTP_OK: 1678 case HTTP_PARTIAL: 1679 case HTTP_NOT_MODIFIED: 1680 /* fine */ 1681 break; 1682 case HTTP_MOVED_PERM: 1683 case HTTP_MOVED_TEMP: 1684 case HTTP_SEE_OTHER: 1685 /* 1686 * Not so fine, but we still have to read the 1687 * headers to get the new location. 1688 */ 1689 break; 1690 case HTTP_NEED_AUTH: 1691 if (server_challenges.valid) { 1692 /* 1693 * We already sent out authorization code, 1694 * so there's nothing more we can do. 1695 */ 1696 http_seterr(conn->err); 1697 goto ouch; 1698 } 1699 /* try again, but send the password this time */ 1700 if (verbose) 1701 fetch_info("server requires authorization"); 1702 break; 1703 case HTTP_NEED_PROXY_AUTH: 1704 if (proxy_challenges.valid) { 1705 /* 1706 * We already sent our proxy 1707 * authorization code, so there's 1708 * nothing more we can do. */ 1709 http_seterr(conn->err); 1710 goto ouch; 1711 } 1712 /* try again, but send the password this time */ 1713 if (verbose) 1714 fetch_info("proxy requires authorization"); 1715 break; 1716 case HTTP_BAD_RANGE: 1717 /* 1718 * This can happen if we ask for 0 bytes because 1719 * we already have the whole file. Consider this 1720 * a success for now, and check sizes later. 1721 */ 1722 break; 1723 case HTTP_PROTOCOL_ERROR: 1724 /* fall through */ 1725 case -1: 1726 fetch_syserr(); 1727 goto ouch; 1728 default: 1729 http_seterr(conn->err); 1730 if (!verbose) 1731 goto ouch; 1732 /* fall through so we can get the full error message */ 1733 } 1734 1735 /* get headers. http_next_header expects one line readahead */ 1736 if (fetch_getln(conn) == -1) { 1737 fetch_syserr(); 1738 goto ouch; 1739 } 1740 do { 1741 switch ((h = http_next_header(conn, &headerbuf, &p))) { 1742 case hdr_syserror: 1743 fetch_syserr(); 1744 goto ouch; 1745 case hdr_error: 1746 http_seterr(HTTP_PROTOCOL_ERROR); 1747 goto ouch; 1748 case hdr_content_length: 1749 http_parse_length(p, &clength); 1750 break; 1751 case hdr_content_range: 1752 http_parse_range(p, &offset, &length, &size); 1753 break; 1754 case hdr_last_modified: 1755 http_parse_mtime(p, &mtime); 1756 break; 1757 case hdr_location: 1758 if (!HTTP_REDIRECT(conn->err)) 1759 break; 1760 if (new) 1761 free(new); 1762 if (verbose) 1763 fetch_info("%d redirect to %s", conn->err, p); 1764 if (*p == '/') 1765 /* absolute path */ 1766 new = fetchMakeURL(url->scheme, url->host, url->port, p, 1767 url->user, url->pwd); 1768 else 1769 new = fetchParseURL(p); 1770 if (new == NULL) { 1771 /* XXX should set an error code */ 1772 DEBUG(fprintf(stderr, "failed to parse new URL\n")); 1773 goto ouch; 1774 } 1775 if (!*new->user && !*new->pwd) { 1776 strcpy(new->user, url->user); 1777 strcpy(new->pwd, url->pwd); 1778 } 1779 new->offset = url->offset; 1780 new->length = url->length; 1781 break; 1782 case hdr_transfer_encoding: 1783 /* XXX weak test*/ 1784 chunked = (strcasecmp(p, "chunked") == 0); 1785 break; 1786 case hdr_www_authenticate: 1787 if (conn->err != HTTP_NEED_AUTH) 1788 break; 1789 if (http_parse_authenticate(p, &server_challenges) == 0) 1790 ++n; 1791 break; 1792 case hdr_proxy_authenticate: 1793 if (conn->err != HTTP_NEED_PROXY_AUTH) 1794 break; 1795 if (http_parse_authenticate(p, &proxy_challenges) == 0) 1796 ++n; 1797 break; 1798 case hdr_end: 1799 /* fall through */ 1800 case hdr_unknown: 1801 /* ignore */ 1802 break; 1803 } 1804 } while (h > hdr_end); 1805 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