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/*
* DEBUG: section 68 HTTP Content-Range Header
* AUTHOR: Alex Rousskov
*
* SQUID Web Proxy Cache http://www.squid-cache.org/
* ----------------------------------------------------------
*
* Squid is the result of efforts by numerous individuals from
* the Internet community; see the CONTRIBUTORS file for full
* details. Many organizations have provided support for Squid's
* development; see the SPONSORS file for full details. Squid is
* Copyrighted (C) 2001 by the Regents of the University of
* California; see the COPYRIGHT file for full details. Squid
* incorporates software developed and/or copyrighted by other
* sources; see the CREDITS file for full details.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
*/
#include "squid.h"
#include "Debug.h"
#include "enums.h"
#include "HttpHdrContRange.h"
#include "HttpHeaderTools.h"
#include "Mem.h"
/*
* Currently only byte ranges are supported
*
* Content-Range = "Content-Range" ":" content-range-spec
* content-range-spec = byte-content-range-spec
* byte-content-range-spec = bytes-unit SP
* ( byte-range-resp-spec | "*") "/"
* ( entity-length | "*" )
* byte-range-resp-spec = first-byte-pos "-" last-byte-pos
* entity-length = 1*DIGIT
*/
/* local constants */
#define range_spec_unknown (-1)
/* local routines */
#define known_spec(s) ((s) != range_spec_unknown)
#define size_min(a,b) ((a) <= (b) ? (a) : (b))
#define size_diff(a,b) ((a) >= (b) ? ((a)-(b)) : 0)
/* globals */
/* parses range-resp-spec and inits spec, returns true on success */
static int
httpHdrRangeRespSpecParseInit(HttpHdrRangeSpec * spec, const char *field, int flen)
{
const char *p;
assert(spec);
spec->offset = spec->length = range_spec_unknown;
if (flen < 2)
return 0;
/* is spec given ? */
if (*field == '*')
return 1;
/* check format, must be %d-%d */
if (!((p = strchr(field, '-')) && (p - field < flen))) {
debugs(68, 2, "invalid (no '-') resp-range-spec near: '" << field << "'");
return 0;
}
/* parse offset */
if (!httpHeaderParseOffset(field, &spec->offset))
return 0;
/* Additional check for BUG2155 - there MUST BE first-byte-pos and it MUST be positive*/
if (spec->offset < 0) {
debugs(68, 2, "invalid (no first-byte-pos or it is negative) resp-range-spec near: '" << field << "'");
return 0;
}
++p;
/* do we have last-pos ? */
if (p - field >= flen) {
debugs(68, 2, "invalid (no last-byte-pos) resp-range-spec near: '" << field << "'");
return 0;
}
int64_t last_pos;
if (!httpHeaderParseOffset(p, &last_pos))
return 0;
if (last_pos < spec->offset) {
debugs(68, 2, "invalid (negative last-byte-pos) resp-range-spec near: '" << field << "'");
return 0;
}
spec->length = size_diff(last_pos + 1, spec->offset);
/* we managed to parse, check if the result makes sence */
if (spec->length <= 0) {
debugs(68, 2, "invalid range (" << spec->offset << " += " <<
(long int) spec->length << ") in resp-range-spec near: '" << field << "'");
return 0;
}
return 1;
}
static void
httpHdrRangeRespSpecPackInto(const HttpHdrRangeSpec * spec, Packer * p)
{
/* Ensure typecast is safe */
assert (spec->length >= 0);
if (!known_spec(spec->offset) || !known_spec(spec->length))
packerPrintf(p, "*");
else
packerPrintf(p, "bytes %" PRId64 "-%" PRId64,
spec->offset, spec->offset + spec->length - 1);
}
/*
* Content Range
*/
HttpHdrContRange *
httpHdrContRangeCreate(void)
{
HttpHdrContRange *r = (HttpHdrContRange *)memAllocate(MEM_HTTP_HDR_CONTENT_RANGE);
r->spec.offset = r->spec.length = range_spec_unknown;
r->elength = range_spec_unknown;
return r;
}
HttpHdrContRange *
httpHdrContRangeParseCreate(const char *str)
{
HttpHdrContRange *r = httpHdrContRangeCreate();
if (!httpHdrContRangeParseInit(r, str)) {
httpHdrContRangeDestroy(r);
r = NULL;
}
return r;
}
/* returns true if ranges are valid; inits HttpHdrContRange */
int
httpHdrContRangeParseInit(HttpHdrContRange * range, const char *str)
{
const char *p;
assert(range && str);
debugs(68, 8, "parsing content-range field: '" << str << "'");
/* check range type */
if (strncasecmp(str, "bytes ", 6))
return 0;
str += 6;
/* split */
if (!(p = strchr(str, '/')))
return 0;
if (*str == '*')
range->spec.offset = range->spec.length = range_spec_unknown;
else if (!httpHdrRangeRespSpecParseInit(&range->spec, str, p - str))
return 0;
++p;
if (*p == '*')
range->elength = range_spec_unknown;
else if (!httpHeaderParseOffset(p, &range->elength))
return 0;
else if (range->elength <= 0) {
/* Additional paranoidal check for BUG2155 - entity-length MUST be > 0 */
debugs(68, 2, "invalid (entity-length is negative) content-range-spec near: '" << str << "'");
return 0;
} else if (known_spec(range->spec.length) && range->elength < (range->spec.offset + range->spec.length)) {
debugs(68, 2, "invalid (range is outside entity-length) content-range-spec near: '" << str << "'");
return 0;
}
debugs(68, 8, "parsed content-range field: " <<
(long int) range->spec.offset << "-" <<
(long int) range->spec.offset + range->spec.length - 1 << " / " <<
(long int) range->elength);
return 1;
}
void
httpHdrContRangeDestroy(HttpHdrContRange * range)
{
assert(range);
memFree(range, MEM_HTTP_HDR_CONTENT_RANGE);
}
HttpHdrContRange *
httpHdrContRangeDup(const HttpHdrContRange * range)
{
HttpHdrContRange *dup;
assert(range);
dup = httpHdrContRangeCreate();
*dup = *range;
return dup;
}
void
httpHdrContRangePackInto(const HttpHdrContRange * range, Packer * p)
{
assert(range && p);
httpHdrRangeRespSpecPackInto(&range->spec, p);
/* Ensure typecast is safe */
assert (range->elength >= 0);
if (!known_spec(range->elength))
packerPrintf(p, "/*");
else
packerPrintf(p, "/%" PRId64, range->elength);
}
void
httpHdrContRangeSet(HttpHdrContRange * cr, HttpHdrRangeSpec spec, int64_t ent_len)
{
assert(cr && ent_len >= 0);
cr->spec = spec;
cr->elength = ent_len;
}
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