Function match_headers

modules/metadata/mod_setenvif.c:492–638

* This routine gets called at two different points in request processing: * once before the URI has been translated (during the post-read-request * phase) and once after (during the header-parse phase). We use different * config records for the two different calls to reduce overhead (by not * re-doing the server-wide settings during directory processing), and * signal which call it is by hav

 * later one.
 */
static int match_headers(request_rec *r)
{
    sei_cfg_rec *sconf;
    sei_entry *entries;
    const apr_table_entry_t *elts;
    const char *val, *err;
    apr_size_t val_len = 0;
    int i, j;
    char *last_name;
    ap_regmatch_t regm[AP_MAX_REG_MATCH];

    if (!ap_get_module_config(r->request_config, &setenvif_module)) {
        ap_set_module_config(r->request_config, &setenvif_module,
                             SEI_MAGIC_HEIRLOOM);
        sconf  = (sei_cfg_rec *) ap_get_module_config(r->server->module_config,
                                                      &setenvif_module);
    }
    else {
        sconf = (sei_cfg_rec *) ap_get_module_config(r->per_dir_config,
                                                     &setenvif_module);
    }
    entries = (sei_entry *) sconf->conditionals->elts;
    last_name = NULL;
    val = NULL;
    for (i = 0; i < sconf->conditionals->nelts; ++i) {
        sei_entry *b = &entries[i];

        if (!b->expr) {
            /* Optimize the case where a bunch of directives in a row use the
             * same header.  Remember we don't need to strcmp the two header
             * names because we made sure the pointers were equal during
             * configuration.
             */
            if (b->name != last_name) {
                last_name = b->name;
                switch (b->special_type) {
                case SPECIAL_REMOTE_ADDR:
                    val = r->useragent_ip;
                    break;
                case SPECIAL_SERVER_ADDR:
                    val = r->connection->local_ip;
                    break;
                case SPECIAL_REMOTE_HOST:
                    val = ap_get_useragent_host(r, REMOTE_NAME, NULL);
                    break;
                case SPECIAL_REQUEST_URI:
                    val = r->uri;
                    break;
                case SPECIAL_REQUEST_METHOD:
                    val = r->method;
                    break;
                case SPECIAL_REQUEST_PROTOCOL:
                    val = r->protocol;
                    break;
                case SPECIAL_NOT:
                    if (b->pnamereg) {
                        /* Matching headers_in against a regex. Iterate through
                         * the headers_in until we find a match or run out of