1021 lines
23 KiB
C
1021 lines
23 KiB
C
/*-
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* Copyright (c) 2000 Dag-Erling Coïdan Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* The following copyright applies to the base64 code:
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*
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*-
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* Copyright 1997 Massachusetts Institute of Technology
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby
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* granted, provided that both the above copyright notice and this
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* permission notice appear in all copies, that both the above
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* copyright notice and this permission notice appear in all
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* supporting documentation, and that the name of M.I.T. not be used
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* in advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission. M.I.T. makes
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* no representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied
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* warranty.
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*
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* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
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* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
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* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <locale.h>
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#include <netdb.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include "fetch.h"
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#include "common.h"
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#include "httperr.h"
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extern char *__progname; /* XXX not portable */
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/* Maximum number of redirects to follow */
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#define MAX_REDIRECT 5
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/* Symbolic names for reply codes we care about */
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#define HTTP_OK 200
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#define HTTP_PARTIAL 206
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#define HTTP_MOVED_PERM 301
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#define HTTP_MOVED_TEMP 302
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#define HTTP_SEE_OTHER 303
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#define HTTP_NEED_AUTH 401
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#define HTTP_NEED_PROXY_AUTH 403
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#define HTTP_PROTOCOL_ERROR 999
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#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \
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|| (xyz) == HTTP_MOVED_TEMP \
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|| (xyz) == HTTP_SEE_OTHER)
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/*****************************************************************************
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* I/O functions for decoding chunked streams
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*/
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struct cookie
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{
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int fd;
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char *buf;
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size_t b_size;
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size_t b_len;
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int b_pos;
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int eof;
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int error;
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long chunksize;
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#ifdef DEBUG
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long total;
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#endif
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};
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/*
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* Get next chunk header
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*/
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static int
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_http_new_chunk(struct cookie *c)
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{
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char *p;
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if (_fetch_getln(c->fd, &c->buf, &c->b_size, &c->b_len) == -1)
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return -1;
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if (c->b_len < 2 || !ishexnumber(*c->buf))
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return -1;
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for (p = c->buf; !isspace(*p) && *p != ';' && p < c->buf + c->b_len; ++p)
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if (!ishexnumber(*p))
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return -1;
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else if (isdigit(*p))
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c->chunksize = c->chunksize * 16 + *p - '0';
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else
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c->chunksize = c->chunksize * 16 + 10 + tolower(*p) - 'a';
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#ifdef DEBUG
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c->total += c->chunksize;
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if (c->chunksize == 0)
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fprintf(stderr, "\033[1m_http_fillbuf(): "
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"end of last chunk\033[m\n");
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else
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fprintf(stderr, "\033[1m_http_fillbuf(): "
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"new chunk: %ld (%ld)\033[m\n", c->chunksize, c->total);
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#endif
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return c->chunksize;
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}
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/*
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* Fill the input buffer, do chunk decoding on the fly
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*/
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static int
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_http_fillbuf(struct cookie *c)
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{
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if (c->error)
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return -1;
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if (c->eof)
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return 0;
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if (c->chunksize == 0) {
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switch (_http_new_chunk(c)) {
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case -1:
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c->error = 1;
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return -1;
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case 0:
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c->eof = 1;
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return 0;
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}
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}
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if (c->b_size < c->chunksize) {
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char *tmp;
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if ((tmp = realloc(c->buf, c->chunksize)) == NULL)
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return -1;
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c->buf = tmp;
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c->b_size = c->chunksize;
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}
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if ((c->b_len = read(c->fd, c->buf, c->chunksize)) == -1)
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return -1;
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c->chunksize -= c->b_len;
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if (c->chunksize == 0) {
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char endl[2];
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read(c->fd, endl, 2);
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}
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c->b_pos = 0;
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return c->b_len;
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}
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/*
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* Read function
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*/
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static int
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_http_readfn(void *v, char *buf, int len)
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{
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struct cookie *c = (struct cookie *)v;
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int l, pos;
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if (c->error)
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return -1;
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if (c->eof)
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return 0;
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for (pos = 0; len > 0; pos += l, len -= l) {
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/* empty buffer */
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if (!c->buf || c->b_pos == c->b_len)
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if (_http_fillbuf(c) < 1)
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break;
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l = c->b_len - c->b_pos;
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if (len < l)
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l = len;
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bcopy(c->buf + c->b_pos, buf + pos, l);
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c->b_pos += l;
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}
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if (!pos && c->error)
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return -1;
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return pos;
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}
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/*
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* Write function
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*/
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static int
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_http_writefn(void *v, const char *buf, int len)
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{
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struct cookie *c = (struct cookie *)v;
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return write(c->fd, buf, len);
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}
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/*
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* Close function
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*/
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static int
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_http_closefn(void *v)
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{
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struct cookie *c = (struct cookie *)v;
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int r;
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r = close(c->fd);
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if (c->buf)
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free(c->buf);
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free(c);
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return r;
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}
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/*
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* Wrap a file descriptor up
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*/
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static FILE *
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_http_funopen(int fd)
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{
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struct cookie *c;
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FILE *f;
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if ((c = calloc(1, sizeof *c)) == NULL) {
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_fetch_syserr();
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return NULL;
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}
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c->fd = fd;
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if (!(f = funopen(c, _http_readfn, _http_writefn, NULL, _http_closefn))) {
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_fetch_syserr();
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free(c);
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return NULL;
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}
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return f;
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}
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/*****************************************************************************
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* Helper functions for talking to the server and parsing its replies
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*/
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/* Header types */
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typedef enum {
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hdr_syserror = -2,
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hdr_error = -1,
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hdr_end = 0,
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hdr_unknown = 1,
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hdr_content_length,
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hdr_content_range,
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hdr_last_modified,
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hdr_location,
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hdr_transfer_encoding
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} hdr;
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/* Names of interesting headers */
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static struct {
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hdr num;
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char *name;
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} hdr_names[] = {
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{ hdr_content_length, "Content-Length" },
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{ hdr_content_range, "Content-Range" },
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{ hdr_last_modified, "Last-Modified" },
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{ hdr_location, "Location" },
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{ hdr_transfer_encoding, "Transfer-Encoding" },
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{ hdr_unknown, NULL },
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};
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static char *reply_buf;
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static size_t reply_size;
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static size_t reply_length;
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/*
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* Send a formatted line; optionally echo to terminal
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*/
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static int
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_http_cmd(int fd, char *fmt, ...)
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{
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va_list ap;
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size_t len;
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char *msg;
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int r;
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va_start(ap, fmt);
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len = vasprintf(&msg, fmt, ap);
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va_end(ap);
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if (msg == NULL) {
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errno = ENOMEM;
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_fetch_syserr();
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return -1;
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}
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r = _fetch_putln(fd, msg, len);
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free(msg);
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if (r == -1) {
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_fetch_syserr();
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return -1;
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}
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return 0;
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}
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/*
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* Get and parse status line
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*/
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static int
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_http_get_reply(int fd)
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{
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if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1)
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return -1;
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/*
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* A valid status line looks like "HTTP/m.n xyz reason" where m
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* and n are the major and minor protocol version numbers and xyz
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* is the reply code.
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* We grok HTTP 1.0 and 1.1, so m must be 1 and n must be 0 or 1.
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* We don't care about the reason phrase.
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*/
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if (strncmp(reply_buf, "HTTP/1.", 7) != 0
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|| (reply_buf[7] != '0' && reply_buf[7] != '1') || reply_buf[8] != ' '
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|| !isdigit(reply_buf[9])
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|| !isdigit(reply_buf[10])
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|| !isdigit(reply_buf[11]))
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return HTTP_PROTOCOL_ERROR;
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return ((reply_buf[9] - '0') * 100
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+ (reply_buf[10] - '0') * 10
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+ (reply_buf[11] - '0'));
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}
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/*
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* Check a header; if the type matches the given string, return a
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* pointer to the beginning of the value.
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*/
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static char *
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_http_match(char *str, char *hdr)
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{
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while (*str && *hdr && tolower(*str++) == tolower(*hdr++))
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/* nothing */;
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if (*str || *hdr != ':')
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return NULL;
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while (*hdr && isspace(*++hdr))
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/* nothing */;
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return hdr;
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}
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/*
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* Get the next header and return the appropriate symbolic code.
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*/
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static hdr
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_http_next_header(int fd, char **p)
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{
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int i;
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if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1)
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return hdr_syserror;
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while (reply_length && isspace(reply_buf[reply_length-1]))
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reply_length--;
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reply_buf[reply_length] = 0;
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if (reply_length == 0)
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return hdr_end;
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/*
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* We could check for malformed headers but we don't really care.
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* A valid header starts with a token immediately followed by a
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* colon; a token is any sequence of non-control, non-whitespace
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* characters except "()<>@,;:\\\"{}".
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*/
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for (i = 0; hdr_names[i].num != hdr_unknown; i++)
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if ((*p = _http_match(hdr_names[i].name, reply_buf)) != NULL)
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return hdr_names[i].num;
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return hdr_unknown;
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}
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/*
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* Parse a last-modified header
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*/
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static time_t
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_http_parse_mtime(char *p)
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{
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char locale[64];
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struct tm tm;
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strncpy(locale, setlocale(LC_TIME, NULL), sizeof locale);
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setlocale(LC_TIME, "C");
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strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm);
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/* XXX should add support for date-2 and date-3 */
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setlocale(LC_TIME, locale);
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DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d "
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"%02d:%02d:%02d\033[m]\n",
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tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
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tm.tm_hour, tm.tm_min, tm.tm_sec));
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return timegm(&tm);
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}
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/*
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* Parse a content-length header
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*/
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static off_t
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_http_parse_length(char *p)
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{
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off_t len;
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for (len = 0; *p && isdigit(*p); ++p)
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len = len * 10 + (*p - '0');
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DEBUG(fprintf(stderr, "content length: [\033[1m%lld\033[m]\n", len));
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return len;
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}
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/*
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* Parse a content-range header
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*/
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static off_t
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_http_parse_range(char *p)
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{
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off_t off;
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if (strncasecmp(p, "bytes ", 6) != 0)
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return -1;
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for (p += 6, off = 0; *p && isdigit(*p); ++p)
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off = off * 10 + *p - '0';
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if (*p != '-')
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return -1;
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DEBUG(fprintf(stderr, "content range: [\033[1m%lld-\033[m]\n", off));
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return off;
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}
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/*****************************************************************************
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* Helper functions for authorization
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*/
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/*
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* Base64 encoding
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*/
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static char *
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_http_base64(char *src)
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{
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static const char base64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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char *str, *dst;
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size_t l;
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int t, r;
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l = strlen(src);
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if ((str = malloc(((l + 2) / 3) * 4)) == NULL)
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return NULL;
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dst = str;
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r = 0;
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while (l >= 3) {
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t = (src[0] << 16) | (src[1] << 8) | src[2];
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dst[0] = base64[(t >> 18) & 0x3f];
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dst[1] = base64[(t >> 12) & 0x3f];
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dst[2] = base64[(t >> 6) & 0x3f];
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dst[3] = base64[(t >> 0) & 0x3f];
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src += 3; l -= 3;
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dst += 4; r += 4;
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}
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switch (l) {
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case 2:
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t = (src[0] << 16) | (src[1] << 8);
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dst[0] = base64[(t >> 18) & 0x3f];
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dst[1] = base64[(t >> 12) & 0x3f];
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dst[2] = base64[(t >> 6) & 0x3f];
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dst[3] = '=';
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dst += 4;
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r += 4;
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break;
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case 1:
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t = src[0] << 16;
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dst[0] = base64[(t >> 18) & 0x3f];
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dst[1] = base64[(t >> 12) & 0x3f];
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dst[2] = dst[3] = '=';
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dst += 4;
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r += 4;
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break;
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case 0:
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break;
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}
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*dst = 0;
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return str;
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}
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/*
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* Encode username and password
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*/
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static int
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_http_basic_auth(int fd, char *hdr, char *usr, char *pwd)
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{
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char *upw, *auth;
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int r;
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if (asprintf(&upw, "%s:%s", usr, pwd) == -1)
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return -1;
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auth = _http_base64(upw);
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free(upw);
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if (auth == NULL)
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return -1;
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r = _http_cmd(fd, "%s: Basic %s", hdr, auth);
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free(auth);
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return r;
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}
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/*
|
||
* Send an authorization header
|
||
*/
|
||
static int
|
||
_http_authorize(int fd, char *hdr, char *p)
|
||
{
|
||
/* basic authorization */
|
||
if (strncasecmp(p, "basic:", 6) == 0) {
|
||
char *user, *pwd, *str;
|
||
int r;
|
||
|
||
/* skip realm */
|
||
for (p += 6; *p && *p != ':'; ++p)
|
||
/* nothing */ ;
|
||
if (!*p || strchr(++p, ':') == NULL)
|
||
return -1;
|
||
if ((str = strdup(p)) == NULL)
|
||
return -1; /* XXX */
|
||
user = str;
|
||
pwd = strchr(str, ':');
|
||
*pwd++ = '\0';
|
||
r = _http_basic_auth(fd, hdr, user, pwd);
|
||
free(str);
|
||
return r;
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
|
||
/*****************************************************************************
|
||
* Helper functions for connecting to a server or proxy
|
||
*/
|
||
|
||
/*
|
||
* Connect to the specified HTTP proxy server.
|
||
*/
|
||
static int
|
||
_http_proxy_connect(char *proxy, int af, int verbose)
|
||
{
|
||
char *hostname, *p;
|
||
int fd, port;
|
||
|
||
/* get hostname */
|
||
hostname = NULL;
|
||
#ifdef INET6
|
||
/* host part can be an IPv6 address enclosed in square brackets */
|
||
if (*proxy == '[') {
|
||
if ((p = strchr(proxy, ']')) == NULL) {
|
||
/* no terminating bracket */
|
||
/* XXX should set an error code */
|
||
goto ouch;
|
||
}
|
||
if (p[1] != '\0' && p[1] != ':') {
|
||
/* garbage after address */
|
||
/* XXX should set an error code */
|
||
goto ouch;
|
||
}
|
||
if ((hostname = malloc(p - proxy)) == NULL) {
|
||
errno = ENOMEM;
|
||
_fetch_syserr();
|
||
goto ouch;
|
||
}
|
||
strncpy(hostname, proxy + 1, p - proxy - 1);
|
||
hostname[p - proxy - 1] = '\0';
|
||
++p;
|
||
} else {
|
||
#endif /* INET6 */
|
||
if ((p = strchr(proxy, ':')) == NULL)
|
||
p = strchr(proxy, '\0');
|
||
if ((hostname = malloc(p - proxy + 1)) == NULL) {
|
||
errno = ENOMEM;
|
||
_fetch_syserr();
|
||
goto ouch;
|
||
}
|
||
strncpy(hostname, proxy, p - proxy);
|
||
hostname[p - proxy] = '\0';
|
||
#ifdef INET6
|
||
}
|
||
#endif /* INET6 */
|
||
DEBUG(fprintf(stderr, "proxy name: [%s]\n", hostname));
|
||
|
||
/* get port number */
|
||
port = 0;
|
||
if (*p == ':') {
|
||
++p;
|
||
if (strspn(p, "0123456789") != strlen(p) || strlen(p) > 5) {
|
||
/* port number is non-numeric or too long */
|
||
/* XXX should set an error code */
|
||
goto ouch;
|
||
}
|
||
port = atoi(p);
|
||
if (port < 1 || port > 65535) {
|
||
/* port number is out of range */
|
||
/* XXX should set an error code */
|
||
goto ouch;
|
||
}
|
||
}
|
||
|
||
if (!port) {
|
||
#if 0
|
||
/*
|
||
* commented out, since there is currently no service name
|
||
* for HTTP proxies
|
||
*/
|
||
struct servent *se;
|
||
|
||
if ((se = getservbyname("xxxx", "tcp")) != NULL)
|
||
port = ntohs(se->s_port);
|
||
else
|
||
#endif
|
||
port = 3128;
|
||
}
|
||
DEBUG(fprintf(stderr, "proxy port: %d\n", port));
|
||
|
||
/* connect */
|
||
if ((fd = _fetch_connect(hostname, port, af, verbose)) == -1)
|
||
_fetch_syserr();
|
||
return fd;
|
||
|
||
ouch:
|
||
if (hostname)
|
||
free(hostname);
|
||
return -1;
|
||
}
|
||
|
||
/*
|
||
* Connect to the correct HTTP server or proxy.
|
||
*/
|
||
static int
|
||
_http_connect(struct url *URL, int *proxy, char *flags)
|
||
{
|
||
int direct, verbose;
|
||
int af, fd;
|
||
char *p;
|
||
|
||
#ifdef INET6
|
||
af = AF_UNSPEC;
|
||
#else
|
||
af = AF_INET;
|
||
#endif
|
||
|
||
direct = (flags && strchr(flags, 'd'));
|
||
verbose = (flags && strchr(flags, 'v'));
|
||
if (flags && strchr(flags, '4'))
|
||
af = AF_INET;
|
||
else if (flags && strchr(flags, '6'))
|
||
af = AF_INET6;
|
||
|
||
/* check port */
|
||
if (!URL->port) {
|
||
struct servent *se;
|
||
|
||
/* Scheme can be ftp if we're using a proxy */
|
||
if (strcasecmp(URL->scheme, "ftp") == 0)
|
||
if ((se = getservbyname("ftp", "tcp")) != NULL)
|
||
URL->port = ntohs(se->s_port);
|
||
else
|
||
URL->port = 21;
|
||
else
|
||
if ((se = getservbyname("http", "tcp")) != NULL)
|
||
URL->port = ntohs(se->s_port);
|
||
else
|
||
URL->port = 80;
|
||
}
|
||
|
||
if (!direct && (p = getenv("HTTP_PROXY")) != NULL) {
|
||
/* attempt to connect to proxy server */
|
||
if ((fd = _http_proxy_connect(p, af, verbose)) == -1)
|
||
return -1;
|
||
*proxy = 1;
|
||
} else {
|
||
/* if no proxy is configured, try direct */
|
||
if (strcasecmp(URL->scheme, "ftp") == 0) {
|
||
/* can't talk http to an ftp server */
|
||
/* XXX should set an error code */
|
||
return -1;
|
||
}
|
||
if ((fd = _fetch_connect(URL->host, URL->port, af, verbose)) == -1)
|
||
/* _fetch_connect() has already set an error code */
|
||
return -1;
|
||
*proxy = 0;
|
||
}
|
||
|
||
return fd;
|
||
}
|
||
|
||
|
||
/*****************************************************************************
|
||
* Core
|
||
*/
|
||
|
||
/*
|
||
* Send a request and process the reply
|
||
*/
|
||
static FILE *
|
||
_http_request(struct url *URL, char *op, struct url_stat *us, char *flags)
|
||
{
|
||
struct url *url, *new;
|
||
int chunked, need_auth, noredirect, proxy, verbose;
|
||
int code, fd, i, n;
|
||
off_t offset;
|
||
char *p;
|
||
FILE *f;
|
||
hdr h;
|
||
char *host;
|
||
#ifdef INET6
|
||
char hbuf[MAXHOSTNAMELEN + 1];
|
||
#endif
|
||
|
||
noredirect = (flags && strchr(flags, 'A'));
|
||
verbose = (flags && strchr(flags, 'v'));
|
||
|
||
n = noredirect ? 1 : MAX_REDIRECT;
|
||
|
||
/* just to appease compiler warnings */
|
||
code = HTTP_PROTOCOL_ERROR;
|
||
chunked = 0;
|
||
offset = 0;
|
||
fd = -1;
|
||
|
||
for (url = URL, i = 0; i < n; ++i) {
|
||
new = NULL;
|
||
us->size = -1;
|
||
us->atime = us->mtime = 0;
|
||
chunked = 0;
|
||
need_auth = 0;
|
||
offset = 0;
|
||
fd = -1;
|
||
retry:
|
||
/* connect to server or proxy */
|
||
if ((fd = _http_connect(url, &proxy, flags)) == -1)
|
||
goto ouch;
|
||
|
||
host = url->host;
|
||
#ifdef INET6
|
||
if (strchr(url->host, ':')) {
|
||
snprintf(hbuf, sizeof(hbuf), "[%s]", url->host);
|
||
host = hbuf;
|
||
}
|
||
#endif
|
||
|
||
/* send request */
|
||
if (verbose)
|
||
_fetch_info("requesting %s://%s:%d%s",
|
||
url->scheme, host, url->port, url->doc);
|
||
if (proxy) {
|
||
_http_cmd(fd, "%s %s://%s:%d%s HTTP/1.1",
|
||
op, url->scheme, host, url->port, url->doc);
|
||
} else {
|
||
_http_cmd(fd, "%s %s HTTP/1.1",
|
||
op, url->doc);
|
||
}
|
||
|
||
/* proxy authorization */
|
||
if (proxy && (p = getenv("HTTP_PROXY_AUTH")) != NULL)
|
||
_http_authorize(fd, "Proxy-Authorization", p);
|
||
|
||
/* server authorization */
|
||
if (need_auth) {
|
||
if (*url->user || *url->pwd)
|
||
_http_basic_auth(fd, "Authorization",
|
||
url->user ? url->user : "",
|
||
url->pwd ? url->pwd : "");
|
||
else if ((p = getenv("HTTP_AUTH")) != NULL)
|
||
_http_authorize(fd, "Authorization", p);
|
||
else {
|
||
_http_seterr(HTTP_NEED_AUTH);
|
||
goto ouch;
|
||
}
|
||
}
|
||
|
||
/* other headers */
|
||
_http_cmd(fd, "Host: %s:%d", host, url->port);
|
||
_http_cmd(fd, "User-Agent: %s " _LIBFETCH_VER, __progname);
|
||
if (URL->offset)
|
||
_http_cmd(fd, "Range: bytes=%lld-", url->offset);
|
||
_http_cmd(fd, "Connection: close");
|
||
_http_cmd(fd, "");
|
||
|
||
/* get reply */
|
||
switch ((code = _http_get_reply(fd))) {
|
||
case HTTP_OK:
|
||
case HTTP_PARTIAL:
|
||
/* fine */
|
||
break;
|
||
case HTTP_MOVED_PERM:
|
||
case HTTP_MOVED_TEMP:
|
||
/*
|
||
* Not so fine, but we still have to read the headers to
|
||
* get the new location.
|
||
*/
|
||
break;
|
||
case HTTP_NEED_AUTH:
|
||
if (need_auth) {
|
||
/*
|
||
* We already sent out authorization code, so there's
|
||
* nothing more we can do.
|
||
*/
|
||
_http_seterr(code);
|
||
goto ouch;
|
||
}
|
||
/* try again, but send the password this time */
|
||
if (verbose)
|
||
_fetch_info("server requires authorization");
|
||
need_auth = 1;
|
||
close(fd);
|
||
goto retry;
|
||
case HTTP_NEED_PROXY_AUTH:
|
||
/*
|
||
* If we're talking to a proxy, we already sent our proxy
|
||
* authorization code, so there's nothing more we can do.
|
||
*/
|
||
_http_seterr(code);
|
||
goto ouch;
|
||
case HTTP_PROTOCOL_ERROR:
|
||
/* fall through */
|
||
case -1:
|
||
_fetch_syserr();
|
||
goto ouch;
|
||
default:
|
||
_http_seterr(code);
|
||
goto ouch;
|
||
}
|
||
|
||
/* get headers */
|
||
do {
|
||
switch ((h = _http_next_header(fd, &p))) {
|
||
case hdr_syserror:
|
||
_fetch_syserr();
|
||
goto ouch;
|
||
case hdr_error:
|
||
_http_seterr(HTTP_PROTOCOL_ERROR);
|
||
goto ouch;
|
||
case hdr_content_length:
|
||
us->size = _http_parse_length(p);
|
||
break;
|
||
case hdr_content_range:
|
||
offset = _http_parse_range(p);
|
||
break;
|
||
case hdr_last_modified:
|
||
us->atime = us->mtime = _http_parse_mtime(p);
|
||
break;
|
||
case hdr_location:
|
||
if (!HTTP_REDIRECT(code))
|
||
break;
|
||
if (new)
|
||
free(new);
|
||
if (verbose)
|
||
_fetch_info("%d redirect to %s", code, p);
|
||
if (*p == '/')
|
||
/* absolute path */
|
||
new = fetchMakeURL(url->scheme, url->host, url->port, p,
|
||
url->user, url->pwd);
|
||
else
|
||
new = fetchParseURL(p);
|
||
if (new == NULL) {
|
||
/* XXX should set an error code */
|
||
DEBUG(fprintf(stderr, "failed to parse new URL\n"));
|
||
goto ouch;
|
||
}
|
||
if (!*new->user && !*new->pwd) {
|
||
strcpy(new->user, url->user);
|
||
strcpy(new->pwd, url->pwd);
|
||
}
|
||
new->offset = url->offset;
|
||
new->length = url->length;
|
||
break;
|
||
case hdr_transfer_encoding:
|
||
/* XXX weak test*/
|
||
chunked = (strcasecmp(p, "chunked") == 0);
|
||
break;
|
||
case hdr_end:
|
||
/* fall through */
|
||
case hdr_unknown:
|
||
/* ignore */
|
||
break;
|
||
}
|
||
} while (h > hdr_end);
|
||
|
||
/* we either have a hit, or a redirect with no Location: header */
|
||
if (code == HTTP_OK || code == HTTP_PARTIAL || !new)
|
||
break;
|
||
|
||
/* we have a redirect */
|
||
close(fd);
|
||
if (url != URL)
|
||
fetchFreeURL(url);
|
||
url = new;
|
||
}
|
||
|
||
/* no success */
|
||
if (fd == -1) {
|
||
_http_seterr(code);
|
||
goto ouch;
|
||
}
|
||
|
||
/* wrap it up in a FILE */
|
||
if ((f = chunked ? _http_funopen(fd) : fdopen(fd, "r")) == NULL) {
|
||
_fetch_syserr();
|
||
goto ouch;
|
||
}
|
||
|
||
while (offset++ < url->offset)
|
||
if (fgetc(f) == EOF) {
|
||
_fetch_syserr();
|
||
fclose(f);
|
||
f = NULL;
|
||
}
|
||
|
||
if (url != URL)
|
||
fetchFreeURL(url);
|
||
|
||
return f;
|
||
|
||
ouch:
|
||
if (url != URL)
|
||
fetchFreeURL(url);
|
||
if (fd != -1)
|
||
close(fd);
|
||
return NULL;
|
||
}
|
||
|
||
|
||
/*****************************************************************************
|
||
* Entry points
|
||
*/
|
||
|
||
/*
|
||
* Retrieve a file by HTTP
|
||
*/
|
||
FILE *
|
||
fetchGetHTTP(struct url *URL, char *flags)
|
||
{
|
||
struct url_stat us;
|
||
|
||
return _http_request(URL, "GET", &us, flags);
|
||
}
|
||
|
||
FILE *
|
||
fetchPutHTTP(struct url *URL, char *flags)
|
||
{
|
||
warnx("fetchPutHTTP(): not implemented");
|
||
return NULL;
|
||
}
|
||
|
||
/*
|
||
* Get an HTTP document's metadata
|
||
*/
|
||
int
|
||
fetchStatHTTP(struct url *URL, struct url_stat *us, char *flags)
|
||
{
|
||
FILE *f;
|
||
|
||
if ((f = _http_request(URL, "HEAD", us, flags)) == NULL)
|
||
return -1;
|
||
fclose(f);
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* List a directory
|
||
*/
|
||
struct url_ent *
|
||
fetchListHTTP(struct url *url, char *flags)
|
||
{
|
||
warnx("fetchListHTTP(): not implemented");
|
||
return NULL;
|
||
}
|