Function ap_proxy_trans_match

modules/proxy/mod_proxy.c:825–977

}

PROXY_DECLARE(int) ap_proxy_trans_match(request_rec *r, struct proxy_alias *ent,
                                        proxy_dir_conf *dconf)
{
    int len;
    const char *fake;
    const char *real;
    ap_regmatch_t regm[AP_MAX_REG_MATCH];
    ap_regmatch_t reg1[AP_MAX_REG_MATCH];
    char *found = NULL;
    int mismatch = 0;
    unsigned int nocanon = ent->flags & PROXYPASS_NOCANON;
    const char *use_uri = nocanon ? r->unparsed_uri : r->uri;
    const char *servlet_uri = NULL;

    if (dconf && (dconf->interpolate_env == 1) && (ent->flags & PROXYPASS_INTERPOLATE)) {
        fake = ap_proxy_interpolate(r, ent->fake);
        real = ap_proxy_interpolate(r, ent->real);
    }
    else {
        fake = ent->fake;
        real = ent->real;
    }

    ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, APLOGNO(03461)
                  "attempting to match URI path '%s' against %s '%s' for "
                  "proxying", r->uri, (ent->regex ? "pattern" : "prefix"),
                  fake);

    if (ent->regex) {
        if (!ap_regexec(ent->regex, r->uri, AP_MAX_REG_MATCH, regm, 0)) {
            if ((real[0] == '!') && (real[1] == '\0')) {
                ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(03462)
                              "proxying is explicitly disabled for URI path "
                              "'%s'; declining", r->uri);
                return DECLINED;
            }
            /* test that we haven't reduced the URI */
            if (nocanon && ap_regexec(ent->regex, r->unparsed_uri,
                    AP_MAX_REG_MATCH, reg1, 0)) {
                mismatch = 1;
                use_uri = r->uri;
            }
            found = ap_pregsub(r->pool, real, use_uri, AP_MAX_REG_MATCH,
                    (use_uri == r->uri) ? regm : reg1);
            if (!found) {
                ap_log_rerror(APLOG_MARK, APLOG_CRIT, 0, r, APLOGNO(01135)
                              "Substitution in regular expression failed. "
                              "Replacement too long?");
                return HTTP_INTERNAL_SERVER_ERROR;
            }

            /* Note: The strcmp() below catches cases where there
             * was no regex substitution. This is so cases like:
             *
             *    ProxyPassMatch \.gif balancer://foo
             *
             * will work "as expected". The upshot is that the 2
             * directives below act the exact same way (ie: $1 is implied):