473 lines
12 KiB
C
473 lines
12 KiB
C
/*-
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* Copyright (c) 1998 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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* $Id: http.c,v 1.3 1998/07/11 21:29:08 des Exp $
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*/
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/*
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* The base64 code in this file is based on code from MIT fetch, which
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* has the following copyright and license:
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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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#include <sys/param.h>
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#include <sys/errno.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <err.h>
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#include <ctype.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 <unistd.h>
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#include "fetch.h"
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#include "httperr.c"
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#ifndef NDEBUG
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#define DEBUG(x) do x; while (0)
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#else
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#define DEBUG(x) do { } while (0)
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#endif
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extern char *__progname;
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#define ENDL "\r\n"
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struct cookie
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{
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FILE *real_f;
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#define ENC_NONE 0
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#define ENC_CHUNKED 1
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int encoding; /* 1 = chunked, 0 = none */
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#define HTTPCTYPELEN 59
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char content_type[HTTPCTYPELEN+1];
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char *buf;
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int b_cur, eof;
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unsigned b_len, chunksize;
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};
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/*
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* Look up error code
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*/
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static const char *
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_http_errstring(int e)
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{
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struct httperr *p = _http_errlist;
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while ((p->num != -1) && (p->num != e))
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p++;
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return p->string;
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}
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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(FILE *f, char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vfprintf(f, fmt, ap);
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#ifndef NDEBUG
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fprintf(stderr, "\033[1m>>> ");
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vfprintf(stderr, fmt, ap);
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fprintf(stderr, "\033[m");
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#endif
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va_end(ap);
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return 0; /* XXX */
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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 char *
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_http_fillbuf(struct cookie *c)
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{
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char *ln;
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unsigned int len;
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if (c->eof)
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return NULL;
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if (c->encoding == ENC_NONE) {
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c->buf = fgetln(c->real_f, &(c->b_len));
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c->b_cur = 0;
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} else if (c->encoding == ENC_CHUNKED) {
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if (c->chunksize == 0) {
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ln = fgetln(c->real_f, &len);
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DEBUG(fprintf(stderr, "\033[1m_http_fillbuf(): new chunk: "
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"%*.*s\033[m\n", (int)len-2, (int)len-2, ln));
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sscanf(ln, "%x", &(c->chunksize));
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if (!c->chunksize) {
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DEBUG(fprintf(stderr, "\033[1m_http_fillbuf(): "
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"end of last chunk\033[m\n"));
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c->eof = 1;
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return NULL;
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}
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DEBUG(fprintf(stderr, "\033[1m_http_fillbuf(): "
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"new chunk: %X\033[m\n", c->chunksize));
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}
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c->buf = fgetln(c->real_f, &(c->b_len));
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if (c->b_len > c->chunksize)
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c->b_len = c->chunksize;
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c->chunksize -= c->b_len;
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c->b_cur = 0;
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}
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else return NULL; /* unknown encoding */
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return c->buf;
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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(struct cookie *c, char *buf, int len)
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{
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int l, pos = 0;
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while (len) {
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/* empty buffer */
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if (!c->buf || (c->b_cur == c->b_len))
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if (!_http_fillbuf(c))
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break;
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l = c->b_len - c->b_cur;
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if (len < l) l = len;
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memcpy(buf + pos, c->buf + c->b_cur, l);
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c->b_cur += l;
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pos += l;
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len -= l;
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}
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if (ferror(c->real_f))
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return -1;
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else 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(struct cookie *c, const char *buf, int len)
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{
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size_t r = fwrite(buf, 1, (size_t)len, c->real_f);
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return r ? r : -1;
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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(struct cookie *c)
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{
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int r = fclose(c->real_f);
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free(c);
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return (r == EOF) ? -1 : 0;
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}
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/*
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* Extract content type from cookie
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*/
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char *
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fetchContentType(FILE *f)
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{
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/*
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* We have no way of making sure this really *is* one of our cookies,
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* so just check for a null pointer and hope for the best.
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*/
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return f->_cookie ? (((struct cookie *)f->_cookie)->content_type) : NULL;
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}
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/*
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* Base64 encoding
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*/
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int
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_http_base64(char *dst, char *src, int l)
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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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int t, 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 r;
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}
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/*
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* Encode username and password
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*/
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char *
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_http_auth(char *usr, char *pwd)
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{
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int len, lu, lp;
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char *str, *s;
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lu = strlen(usr);
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lp = strlen(pwd);
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len = (lu * 4 + 2) / 3 /* user name, round up */
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+ 1 /* colon */
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+ (lp * 4 + 2) / 3 /* password, round up */
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+ 1; /* null */
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if ((s = str = (char *)malloc(len)) == NULL)
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return NULL;
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s += _http_base64(s, usr, lu);
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*s++ = ':';
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s += _http_base64(s, pwd, lp);
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*s = 0;
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return str;
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}
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/*
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* retrieve a file by HTTP
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*/
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FILE *
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fetchGetHTTP(url_t *URL, char *flags)
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{
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int sd = -1, err, i, enc = ENC_NONE;
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struct cookie *c;
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char *ln, *p, *q;
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FILE *f, *cf;
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size_t len;
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/* allocate cookie */
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if ((c = calloc(1, sizeof(struct cookie))) == NULL)
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return NULL;
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/* check port */
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if (!URL->port)
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URL->port = 80; /* default HTTP port */
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/* attempt to connect to proxy server */
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if (getenv("HTTP_PROXY")) {
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char *px, host[MAXHOSTNAMELEN];
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int port = 3128; /* XXX I think 3128 is default... check? */
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size_t len;
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/* measure length */
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px = getenv("HTTP_PROXY");
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len = strcspn(px, ":");
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/* get port (atoi is a little too tolerant perhaps?) */
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if (px[len] == ':')
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port = atoi(px+len+1);
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/* get host name */
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if (len >= MAXHOSTNAMELEN)
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len = MAXHOSTNAMELEN - 1;
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strncpy(host, px, len);
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host[len] = 0;
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/* connect */
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sd = fetchConnect(host, port);
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}
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/* if no proxy is configured or could be contacted, try direct */
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if (sd < 0) {
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if ((sd = fetchConnect(URL->host, URL->port)) < 0)
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goto ouch;
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}
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/* reopen as stream */
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if ((f = fdopen(sd, "r+")) == NULL)
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goto ouch;
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c->real_f = f;
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/* send request (proxies require absolute form, so use that) */
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_http_cmd(f, "GET http://%s:%d%s HTTP/1.1" ENDL,
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URL->host, URL->port, URL->doc);
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/* start sending headers away */
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if (URL->user[0] || URL->pwd[0]) {
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char *auth_str = _http_auth(URL->user, URL->pwd);
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if (!auth_str)
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goto fouch;
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_http_cmd(f, "Authorization: Basic %s" ENDL, auth_str);
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free(auth_str);
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}
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_http_cmd(f, "Host: %s:%d" ENDL, URL->host, URL->port);
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_http_cmd(f, "User-Agent: %s " _LIBFETCH_VER ENDL, __progname);
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_http_cmd(f, "Connection: close" ENDL ENDL);
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/* get response */
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if ((ln = fgetln(f, &len)) == NULL)
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goto fouch;
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DEBUG(fprintf(stderr, "response: [\033[1m%*.*s\033[m]\n",
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(int)len-2, (int)len-2, ln));
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/* we can't use strchr() and friends since ln isn't NUL-terminated */
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p = ln;
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while ((p < ln + len) && !isspace(*p))
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p++;
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while ((p < ln + len) && !isdigit(*p))
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p++;
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if (!isdigit(*p))
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goto fouch;
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err = atoi(p);
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DEBUG(fprintf(stderr, "code: [\033[1m%d\033[m]\n", err));
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/* add code to handle redirects later */
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if (err != 200) {
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fetchLastErrCode = err;
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fetchLastErrText = _http_errstring(err);
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goto fouch;
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}
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/* browse through header */
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while (1) {
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if ((ln = fgetln(f, &len)) == NULL)
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goto fouch;
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if ((ln[0] == '\r') || (ln[0] == '\n'))
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break;
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DEBUG(fprintf(stderr, "header: [\033[1m%*.*s\033[m]\n",
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(int)len-2, (int)len-2, ln));
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#define XFERENC "Transfer-Encoding:"
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if (strncasecmp(ln, XFERENC, sizeof(XFERENC)-1) == 0) {
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p = ln + sizeof(XFERENC) - 1;
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while ((p < ln + len) && isspace(*p))
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p++;
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for (q = p; (q < ln + len) && !isspace(*q); q++)
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/* VOID */ ;
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*q = 0;
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if (strcasecmp(p, "chunked") == 0)
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enc = ENC_CHUNKED;
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DEBUG(fprintf(stderr, "xferenc: [\033[1m%s\033[m]\n", p));
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#undef XFERENC
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#define CONTTYPE "Content-Type:"
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} else if (strncasecmp(ln, CONTTYPE, sizeof(CONTTYPE)-1) == 0) {
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p = ln + sizeof(CONTTYPE) - 1;
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while ((p < ln + len) && isspace(*p))
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p++;
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for (i = 0; p < ln + len; p++)
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if (i < HTTPCTYPELEN)
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c->content_type[i++] = *p;
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do c->content_type[i--] = 0; while (isspace(c->content_type[i]));
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DEBUG(fprintf(stderr, "conttype: [\033[1m%s\033[m]\n",
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c->content_type));
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#undef CONTTYPE
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}
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}
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/* only body remains */
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c->encoding = enc;
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cf = funopen(c,
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(int (*)(void *, char *, int))_http_readfn,
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(int (*)(void *, const char *, int))_http_writefn,
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(fpos_t (*)(void *, fpos_t, int))NULL,
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(int (*)(void *))_http_closefn);
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if (cf == NULL)
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goto fouch;
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return cf;
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ouch:
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if (sd >= 0)
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close(sd);
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free(c);
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return NULL;
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fouch:
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fclose(f);
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free(c);
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return NULL;
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}
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FILE *
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fetchPutHTTP(url_t *URL, char *flags)
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{
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warnx("fetchPutHTTP(): not implemented");
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return NULL;
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}
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