Function dav_process_if_header

modules/dav/main/util.c:669–852

dav_process_if_header: * * If NULL (no error) is returned, then **if_header points to the * "If" productions structure (or NULL if "If" is not present). * * ### this part is bogus: * If an error is encountered, the error is logged. Parent should * return err->status. */

 *   return err->status.
 */
static dav_error * dav_process_if_header(request_rec *r, dav_if_header **p_ih)
{
    dav_error *err;
    char *str;
    char *list;
    const char *state_token;
    const char *uri = NULL;        /* scope of current production; NULL=no-tag */
    apr_size_t uri_len = 0;
    apr_status_t rv;
    dav_if_header *ih = NULL;
    apr_uri_t parsed_uri;
    const dav_hooks_locks *locks_hooks = DAV_GET_HOOKS_LOCKS(r);
    enum {no_tagged, tagged, unknown} list_type = unknown;
    int condition;

    *p_ih = NULL;

    if ((str = apr_pstrdup(r->pool, apr_table_get(r->headers_in, "If"))) == NULL)
        return NULL;

    while (*str) {
        switch(*str) {
        case '<':
            /* Tagged-list production - following states apply to this uri */
            if (list_type == no_tagged
                || ((uri = dav_fetch_next_token(&str, '>')) == NULL)) {
                return dav_new_error(r->pool, HTTP_BAD_REQUEST,
                                     DAV_ERR_IF_TAGGED, 0,
                                     "Invalid If-header: unclosed \"<\" or "
                                     "unexpected tagged-list production.");
            }

            /* 2518 specifies this must be an absolute URI; just take the
             * relative part for later comparison against r->uri */
            if ((rv = apr_uri_parse(r->pool, uri, &parsed_uri)) != APR_SUCCESS
                || !parsed_uri.path) {
                return dav_new_error(r->pool, HTTP_BAD_REQUEST,
                                     DAV_ERR_IF_TAGGED, rv,
                                     "Invalid URI in tagged If-header.");
            }
            /* note that parsed_uri.path is allocated; we can trash it */

            /* clean up the URI a bit */
            if (!ap_normalize_path(parsed_uri.path,
                                   AP_NORMALIZE_NOT_ABOVE_ROOT |
                                   AP_NORMALIZE_DECODE_UNRESERVED)) {
                return dav_new_error(r->pool, HTTP_BAD_REQUEST,
                                     DAV_ERR_IF_TAGGED, rv,
                                     "Invalid URI path tagged If-header.");
            }

            /* the resources we will compare to have unencoded paths */
            if (ap_unescape_url(parsed_uri.path) != OK) {
                return dav_new_error(r->pool, HTTP_BAD_REQUEST,
                                     DAV_ERR_IF_TAGGED, rv,
                                     "Invalid percent encoded URI in "
                                     "tagged If-header.");
            }