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Make meta refresh content attribute parsing more tolerant.

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Simply search for 'url' marker ignoring anything
before it.
ELinks is now able to follow incorrectly written
meta refresh content attribute with missing ; before
url= parameter.
As an example, try http://akkada.tivi.net.pl/
This commit is contained in:
Laurent MONIN 2007-09-08 21:03:22 +02:00
parent 8dbd38eded
commit 41ece7a758
1 changed files with 80 additions and 1 deletions
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81
src/document/html/parser.c
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@ -1,5 +1,9 @@
/* HTML parser */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE /* XXX: we _WANT_ strcasestr() ! */
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
@ -296,6 +300,81 @@ parse_old_meta_refresh(unsigned char *str, unsigned char **ret)
if (len) *ret = memacpy(p, len);
}
/* Search for the url part in the content attribute and returns
* it if found.
* It searches the first occurence of 'url' marker somewhere ignoring
* anything before it.
* It should cope with most situations including:
* content="0; URL='http://www.site.com/path/xxx.htm'"
* content="0 url=http://www.site.com/path/xxx.htm"
* content="anything ; some url === ''''http://www.site.com/path/xxx.htm''''
*
* The return value is one of:
*
* - HEADER_PARAM_FOUND: the parameter was found, copied, and stored in *@ret.
* - HEADER_PARAM_NOT_FOUND: the parameter is not there. *@ret is now NULL.
* - HEADER_PARAM_OUT_OF_MEMORY: error. *@ret is now NULL.
*
* If @ret is NULL, then this function doesn't actually access *@ret,
* and cannot fail with HEADER_PARAM_OUT_OF_MEMORY. Some callers may
* rely on this. */
static enum parse_header_param
search_for_url_param(unsigned char *str, unsigned char **ret)
{
#define LWS(c) ((c) == ' ' || (c) == ASCII_TAB)
unsigned char *p;
int plen = 0;
if (ret) *ret = NULL; /* default in case of early return */
assert(str);
if_assert_failed return HEADER_PARAM_NOT_FOUND;
/* Returns now if string @str is empty. */
if (!*str) return HEADER_PARAM_NOT_FOUND;
p = strcasestr(str, "url");
if (!p) return HEADER_PARAM_NOT_FOUND;
p += 3;
while (*p && (*p <= ' ' || *p == '=')) p++;
if (!*p) {
if (ret) {
*ret = stracpy("");
if (!*ret)
return HEADER_PARAM_OUT_OF_MEMORY;
}
return HEADER_PARAM_FOUND;
}
while ((p[plen] > ' ' || LWS(p[plen])) && p[plen] != ';') plen++;
/* Trim ending spaces */
while (plen > 0 && LWS(p[plen - 1])) plen--;
/* XXX: Drop enclosing single quotes if there's some.
*
* Some websites like newsnow.co.uk are using single quotes around url
* in URL field in meta tag content attribute like this:
* <meta http-equiv="Refresh" content="0; URL='http://www.site.com/path/xxx.htm'">
*
* This is an attempt to handle that, but it may break something else.
* We drop all pair of enclosing quotes found (eg. '''url''' => url).
* Please report any issue related to this. --Zas */
while (plen > 1 && *p == '\'' && p[plen - 1] == '\'') {
p++;
plen -= 2;
}
if (ret) {
*ret = memacpy(p, plen);
if (!*ret)
return HEADER_PARAM_OUT_OF_MEMORY;
}
return HEADER_PARAM_FOUND;
#undef LWS
}
void
process_head(struct html_context *html_context, unsigned char *head)
{
@ -304,7 +383,7 @@ process_head(struct html_context *html_context, unsigned char *head)
refresh = parse_header(head, "Refresh", NULL);
if (!refresh) return;
parse_header_param(refresh, "URL", &url);
search_for_url_param(refresh, &url);
if (!url) {
/* Let's try a more tolerant parsing. */
parse_old_meta_refresh(refresh, &url);