modules/proxy/proxy_ftp.c

	proxy_ftp.c revision a2f9f38db0931e6edf7b71378dd680c3c5fa5841
/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * Portions of this software are based upon public domain software
 * originally written at the National Center for Supercomputing Applications,
 * University of Illinois, Urbana-Champaign.
 */

/* FTP routines for Apache proxy */

#include "apr_strings.h"
#include "mod_proxy.h"
#include "http_main.h"
#include "http_log.h"
#include "http_core.h"

#define AUTODETECT_PWD

static void skiplf(BUFF *foo)
{
    char c;
    do
    {
        c = ap_bgetc(foo);
    } while(c != '\n');
}

/*
 * Decodes a '%' escaped string, and returns the number of characters
 */
static int decodeenc(char *x)
{
    int i, j, ch;

    if (x[0] == '\0')
    return 0;        /* special case for no characters */
    for (i = 0, j = 0; x[i] != '\0'; i++, j++) {
/* decode it if not already done */
    ch = x[i];
    if (ch == '%' && apr_isxdigit(x[i + 1]) && apr_isxdigit(x[i + 2])) {
        ch = ap_proxy_hex2c(&x[i + 1]);
        i += 2;
    }
    x[j] = ch;
    }
    x[j] = '\0';
    return j;
}

/*
 * checks an encoded ftp string for bad characters, namely, CR, LF or
 * non-ascii character
 */
static int ftp_check_string(const char *x)
{
    int i, ch;

    for (i = 0; x[i] != '\0'; i++) {
    ch = x[i];
    if (ch == '%' && apr_isxdigit(x[i + 1]) && apr_isxdigit(x[i + 2])) {
        ch = ap_proxy_hex2c(&x[i + 1]);
        i += 2;
    }
#ifndef CHARSET_EBCDIC
    if (ch == '\015' || ch == '\012' || (ch & 0x80))
#else /*CHARSET_EBCDIC*/
    if (ch == '\r' || ch == '\n' || (os_toascii[ch] & 0x80))
#endif /*CHARSET_EBCDIC*/
        return 0;
    }
    return 1;
}

/*
 * Canonicalise ftp URLs.
 */
int ap_proxy_ftp_canon(request_rec *r, char *url)
{
    char *user, *password, *host, *path, *parms, *strp, sport[7];
    apr_pool_t *p = r->pool;
    const char *err;
    int port;

    port = DEFAULT_FTP_PORT;
    err = ap_proxy_canon_netloc(p, &url, &user, &password, &host, &port);
    if (err)
    return HTTP_BAD_REQUEST;
    if (user != NULL && !ftp_check_string(user))
    return HTTP_BAD_REQUEST;
    if (password != NULL && !ftp_check_string(password))
    return HTTP_BAD_REQUEST;

/* now parse path/parameters args, according to rfc1738 */
/* N.B. if this isn't a true proxy request, then the URL path
 * (but not query args) has already been decoded.
 * This gives rise to the problem of a ; being decoded into the
 * path.
 */
    strp = strchr(url, ';');
    if (strp != NULL) {
    *(strp++) = '\0';
    parms = ap_proxy_canonenc(p, strp, strlen(strp), enc_parm, r->proxyreq);
    if (parms == NULL)
        return HTTP_BAD_REQUEST;
    }
    else
    parms = "";

    path = ap_proxy_canonenc(p, url, strlen(url), enc_path, r->proxyreq);
    if (path == NULL)
    return HTTP_BAD_REQUEST;
    if (!ftp_check_string(path))
    return HTTP_BAD_REQUEST;

    if (!r->proxyreq && r->args != NULL) {
    if (strp != NULL) {
        strp = ap_proxy_canonenc(p, r->args, strlen(r->args), enc_parm, 1);
        if (strp == NULL)
        return HTTP_BAD_REQUEST;
        parms = apr_pstrcat(p, parms, "?", strp, NULL);
    }
    else {
        strp = ap_proxy_canonenc(p, r->args, strlen(r->args), enc_fpath, 1);
        if (strp == NULL)
        return HTTP_BAD_REQUEST;
        path = apr_pstrcat(p, path, "?", strp, NULL);
    }
    r->args = NULL;
    }

/* now, rebuild URL */

    if (port != DEFAULT_FTP_PORT)
    apr_snprintf(sport, sizeof(sport), ":%d", port);
    else
    sport[0] = '\0';

    r->filename = apr_pstrcat(p, "proxy:ftp://", (user != NULL) ? user : "",
                   (password != NULL) ? ":" : "",
                   (password != NULL) ? password : "",
                  (user != NULL) ? "@" : "", host, sport, "/", path,
                   (parms[0] != '\0') ? ";" : "", parms, NULL);

    return OK;
}

/*
 * Returns the ftp status code;
 *  or -1 on I/O error, 0 on data error
 */
static int ftp_getrc(BUFF *f)
{
    int len, status;
    char linebuff[100], buff[5];

    len = ap_bgets(linebuff, sizeof linebuff, f);
    if (len == -1)
    return -1;
/* check format */
    if (len < 5 || !apr_isdigit(linebuff[0]) || !apr_isdigit(linebuff[1]) ||
    !apr_isdigit(linebuff[2]) || (linebuff[3] != ' ' && linebuff[3] != '-'))
    status = 0;
    else
    status = 100 * linebuff[0] + 10 * linebuff[1] + linebuff[2] - 111 * '0';

    if (linebuff[len - 1] != '\n') {
        skiplf(f);
    }

/* skip continuation lines */
    if (linebuff[3] == '-') {
    memcpy(buff, linebuff, 3);
    buff[3] = ' ';
    do {
        len = ap_bgets(linebuff, sizeof linebuff, f);
        if (len == -1)
        return -1;
        if (linebuff[len - 1] != '\n') {
            skiplf(f);
        }
    } while (memcmp(linebuff, buff, 4) != 0);
    }

    return status;
}

/*
 * Like ftp_getrc but returns both the ftp status code and
 * remembers the response message in the supplied buffer
 */
static int ftp_getrc_msg(BUFF *f, char *msgbuf, int msglen)
{
    int len, status;
    char linebuff[100], buff[5];
    char *mb = msgbuf,
     *me = &msgbuf[msglen];

    len = ap_bgets(linebuff, sizeof linebuff, f);
    if (len == -1)
    return -1;
    if (len < 5 || !apr_isdigit(linebuff[0]) || !apr_isdigit(linebuff[1]) ||
    !apr_isdigit(linebuff[2]) || (linebuff[3] != ' ' && linebuff[3] != '-'))
    status = 0;
    else
    status = 100 * linebuff[0] + 10 * linebuff[1] + linebuff[2] - 111 * '0';

    mb = apr_cpystrn(mb, linebuff+4, me - mb);

    if (linebuff[len - 1] != '\n')
        skiplf(f);

    if (linebuff[3] == '-') {
    memcpy(buff, linebuff, 3);
    buff[3] = ' ';
    do {
        len = ap_bgets(linebuff, sizeof linebuff, f);
        if (len == -1)
        return -1;
        if (linebuff[len - 1] != '\n') {
            skiplf(f);
        }
        mb = apr_cpystrn(mb, linebuff+4, me - mb);
    } while (memcmp(linebuff, buff, 4) != 0);
    }
    return status;
}

static long int send_dir(BUFF *f, request_rec *r, ap_cache_el  *c, char *cwd)
{
    char buf[IOBUFSIZE];
    char buf2[IOBUFSIZE];
    char *filename;
    int searchidx = 0;
    char *searchptr = NULL;
    int firstfile = 1;
    apr_ssize_t cntr;
    unsigned long total_bytes_sent = 0;
    register int n, o, w;
    conn_rec *con = r->connection;
    char *dir, *path, *reldir, *site;
    apr_file_t *cachefp = NULL;

    if(c) ap_cache_el_data(c, &cachefp);

    /* Save "scheme://site" prefix without password */
    site = ap_unparse_uri_components(r->pool, &r->parsed_uri, UNP_OMITPASSWORD|UNP_OMITPATHINFO);
    /* ... and path without query args */
    path = ap_unparse_uri_components(r->pool, &r->parsed_uri, UNP_OMITSITEPART|UNP_OMITQUERY);
    (void)decodeenc(path);

    /* Copy path, strip (all except the last) trailing slashes */
    path = dir = apr_pstrcat(r->pool, path, "/", NULL);
    while ((n = strlen(path)) > 1 && path[n-1] == '/' && path[n-2] == '/')
    path[n-1] = '\0';

    /* print "ftp://host/" */
    n = apr_snprintf(buf, sizeof(buf), DOCTYPE_HTML_3_2
        "<HTML><HEAD><TITLE>%s%s</TITLE>\n"
        "<BASE HREF=\"%s%s\"></HEAD>\n"
        "<BODY><H2>Directory of "
        "<A HREF=\"/\">%s</A>/",
        site, path, site, path, site);
    total_bytes_sent += ap_proxy_bputs2(buf, con->client, c);

    while ((dir = strchr(dir+1, '/')) != NULL)
    {
    *dir = '\0';
    if ((reldir = strrchr(path+1, '/'))==NULL)
        reldir = path+1;
    else
        ++reldir;
    /* print "path/" component */
    apr_snprintf(buf, sizeof(buf), "<A HREF=\"/%s/\">%s</A>/", path+1, reldir);
    total_bytes_sent += ap_proxy_bputs2(buf, con->client, c);
    *dir = '/';
    }
    /* If the caller has determined the current directory, and it differs */
    /* from what the client requested, then show the real name */
    if (cwd == NULL || strncmp (cwd, path, strlen(cwd)) == 0) {
    apr_snprintf(buf, sizeof(buf), "</H2>\n<HR><PRE>");
    } else {
    apr_snprintf(buf, sizeof(buf), "</H2>\n(%s)\n<HR><PRE>", cwd);
    }
    total_bytes_sent += ap_proxy_bputs2(buf, con->client, c);

    while (!con->aborted) {
    n = ap_bgets(buf, sizeof buf, f);
    if (n == -1) {        /* input error */
        if (c != NULL) {
            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                          "proxy: error reading from cache");
            ap_proxy_cache_error(&c);
        }
        break;
    }
    if (n == 0)
        break;        /* EOF */
    if (buf[0] == 'l' && (filename=strstr(buf, " -> ")) != NULL) {
        char *link_ptr = filename;

        do {
        filename--;
        } while (filename[0] != ' ');
        *(filename++) = '\0';
        *(link_ptr++) = '\0';
        if ((n = strlen(link_ptr)) > 1 && link_ptr[n - 1] == '\n')
          link_ptr[n - 1] = '\0';
        apr_snprintf(buf2, sizeof(buf2), "%s <A HREF=\"%s\">%s %s</A>\n", buf, filename, filename, link_ptr);
        apr_cpystrn(buf, buf2, sizeof(buf));
        n = strlen(buf);
    }
    else if (buf[0] == 'd' || buf[0] == '-' || buf[0] == 'l' || apr_isdigit(buf[0])) {
        if (apr_isdigit(buf[0])) {    /* handle DOS dir */
        searchptr = strchr(buf, '<');
        if (searchptr != NULL)
            *searchptr = '[';
        searchptr = strchr(buf, '>');
        if (searchptr != NULL)
            *searchptr = ']';
        }

        filename = strrchr(buf, ' ');
        *(filename++) = 0;
        filename[strlen(filename) - 1] = 0;

        /* handle filenames with spaces in 'em */
        if (!strcmp(filename, ".") || !strcmp(filename, "..") || firstfile) {
        firstfile = 0;
        searchidx = filename - buf;
        }
        else if (searchidx != 0 && buf[searchidx] != 0) {
        *(--filename) = ' ';
        buf[searchidx - 1] = 0;
        filename = &buf[searchidx];
        }

        /* Special handling for '.' and '..' */
        if (!strcmp(filename, ".") || !strcmp(filename, "..") || buf[0] == 'd') {
        apr_snprintf(buf2, sizeof(buf2), "%s <A HREF=\"%s/\">%s</A>\n",
            buf, filename, filename);
        }
        else {
        apr_snprintf(buf2, sizeof(buf2), "%s <A HREF=\"%s\">%s</A>\n", buf, filename, filename);
        }
        apr_cpystrn(buf, buf2, sizeof(buf));
        n = strlen(buf);
    }

    o = 0;
    total_bytes_sent += n;

    cntr = n;
    if (cachefp && apr_write(cachefp, buf, &cntr) != APR_SUCCESS) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                      "proxy: error writing to cache");
        ap_proxy_cache_error(&c);
        cachefp = NULL;
    }

    while (n && !r->connection->aborted) {
        w = ap_bwrite(con->client, &buf[o], n, &cntr);
        if (w <= 0)
        break;
        n -= w;
        o += w;
    }
    }

    total_bytes_sent += ap_proxy_bputs2("</PRE><HR>\n", con->client, c);
    total_bytes_sent += ap_proxy_bputs2(ap_psignature("", r), con->client, c);
    total_bytes_sent += ap_proxy_bputs2("</BODY></HTML>\n", con->client, c);

    ap_bflush(con->client);

    return total_bytes_sent;
}

/* Common routine for failed authorization (i.e., missing or wrong password)
 * to an ftp service. This causes most browsers to retry the request
 * with username and password (which was presumably queried from the user)
 * supplied in the Authorization: header.
 * Note that we "invent" a realm name which consists of the
 * ftp://user@host part of the reqest (sans password if supplied but invalid-)
 */
static int ftp_unauthorized (request_rec *r, int log_it)
{
    r->proxyreq = 0;
    /* Log failed requests if they supplied a password
     * (log username/password guessing attempts)
     */
    if (log_it)
    ap_log_rerror(APLOG_MARK, APLOG_INFO|APLOG_NOERRNO, 0, r,
              "proxy: missing or failed auth to %s",
              ap_unparse_uri_components(r->pool,
              &r->parsed_uri, UNP_OMITPATHINFO));

    apr_table_setn(r->err_headers_out, "WWW-Authenticate",
                  apr_pstrcat(r->pool, "Basic realm=\"",
          ap_unparse_uri_components(r->pool, &r->parsed_uri,
                        UNP_OMITPASSWORD|UNP_OMITPATHINFO),
          "\"", NULL));

    return HTTP_UNAUTHORIZED;
}

/*
 * Handles direct access of ftp:// URLs
 * Original (Non-PASV) version from
 * Troy Morrison <spiffnet@zoom.com>
 * PASV added by Chuck
 */
int ap_proxy_ftp_handler(request_rec *r, ap_cache_el  *c, char *url)
{
    char *host, *path, *strp, *parms;
    char *cwd = NULL;
    char *user = NULL;
/*    char *account = NULL; how to supply an account in a URL? */
    const char *password = NULL;
    apr_socket_t *sock, *dsock, *inc;
    int port, i, j, len, rc, nocache = 0;
    apr_socket_t *csd;
    struct in_addr destaddr;
    BUFF *f;
    apr_file_t *cachefp = NULL;
    BUFF *data = NULL;
    apr_pool_t *p = r->pool;
    int one = 1;
    const long int zero = 0L;
    apr_table_t *resp_hdrs;

    void *sconf = r->server->module_config;
    proxy_server_conf *conf =
    (proxy_server_conf *) ap_get_module_config(sconf, &proxy_module);
    struct noproxy_entry *npent = (struct noproxy_entry *) conf->noproxies->elts;
    struct nocache_entry *ncent = (struct nocache_entry *) conf->nocaches->elts;

/* stuff for PASV mode */
    unsigned int presult, h0, h1, h2, h3, p0, p1;
    unsigned short pport;
    int pasvmode = 0;
    char pasv[64];
    char *pstr, dates[APR_RFC822_DATE_LEN];

    char *npaddr;
    apr_uint32_t npport;

/* stuff for responses */
    char resp[MAX_STRING_LEN];
    char *size = NULL;

/* we only support GET and HEAD */

    if (r->method_number != M_GET)
    return HTTP_NOT_IMPLEMENTED;

/* We break the URL into host, port, path-search */

    host = r->parsed_uri.hostname;
    port = (r->parsed_uri.port != 0)
        ? r->parsed_uri.port
        : ap_default_port_for_request(r);
    path = apr_pstrdup(p, r->parsed_uri.path);
    path = (path != NULL && path[0] != '\0') ? &path[1] : "";

    /* The "Authorization:" header must be checked first.
     * We allow the user to "override" the URL-coded user [ & password ]
     * in the Browsers' User&Password Dialog.
     * NOTE that this is only marginally more secure than having the
     * password travel in plain as part of the URL, because Basic Auth
     * simply uuencodes the plain text password.
     * But chances are still smaller that the URL is logged regularly.
     */
    if ((password = apr_table_get(r->headers_in, "Authorization")) != NULL
    && strcasecmp(ap_getword(r->pool, &password, ' '), "Basic") == 0
        && (password = ap_pbase64decode(r->pool, password))[0] != ':') {
        /* Note that this allocation has to be made from r->connection->pool
         * because it has the lifetime of the connection.  The other allocations
         * are temporary and can be tossed away any time.
         */
        user = ap_getword_nulls (r->pool, &password, ':');
        r->ap_auth_type = "Basic";
        r->user = r->parsed_uri.user = user;
        nocache = 1;    /* This resource only accessible with username/password */
    }
    else if ((user = r->parsed_uri.user) != NULL) {
    user = apr_pstrdup(p, user);
    decodeenc(user);
    if ((password = r->parsed_uri.password) != NULL) {
        char *tmp = apr_pstrdup(p, password);
        decodeenc(tmp);
        password = tmp;
    }
    nocache = 1;    /* This resource only accessible with username/password */
    }
    else {
        user = "anonymous";
        password = "apache_proxy@";
    }

/* check if ProxyBlock directive on this host */
    destaddr.s_addr = apr_inet_addr(host);
    for (i = 0; i < conf->noproxies->nelts; i++) {
    if ((npent[i].name != NULL && ap_strstr_c(host, npent[i].name) != NULL)
        || destaddr.s_addr == npent[i].addr.s_addr || npent[i].name[0] == '*')
        return ap_proxyerror(r, HTTP_FORBIDDEN,
                 "Connect to remote machine blocked");
    }

    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: connect to %s:%d", host, port);

    parms = strchr(path, ';');
    if (parms != NULL)
    *(parms++) = '\0';

    if ((apr_create_tcp_socket(&sock, r->pool)) != APR_SUCCESS) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                      "proxy: error creating socket");
        return HTTP_INTERNAL_SERVER_ERROR;
    }

    if (conf->recv_buffer_size > 0 && apr_setsocketopt(sock, APR_SO_RCVBUF,conf->recv_buffer_size)) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                      "setsockopt(SO_RCVBUF): Failed to set ProxyReceiveBufferSize, using default");
    }

    if (apr_setsocketopt(sock, APR_SO_REUSEADDR, one)) {
#ifndef _OSD_POSIX /* BS2000 has this option "always on" */
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                      "proxy: error setting reuseaddr option: setsockopt(SO_REUSEADDR)");
        apr_close_socket(sock);
        return HTTP_INTERNAL_SERVER_ERROR;
#endif /*_OSD_POSIX*/
    }

    if (ap_proxy_doconnect(sock, host, port, r) == -1) {
        apr_close_socket(sock);
        return ap_proxyerror(r, HTTP_BAD_GATEWAY,
                             apr_pstrcat(r->pool, "Could not connect to remote machine: ",
                                        strerror(errno), NULL));
    }

    f = ap_bcreate(p, B_RDWR);
    ap_bpush_socket(f, sock);
/* shouldn't we implement telnet control options here? */

#ifdef CHARSET_EBCDIC
    ap_bsetflag(f, B_ASCII2EBCDIC|B_EBCDIC2ASCII, 1);
#endif /*CHARSET_EBCDIC*/

/* possible results: */
    /* 120 Service ready in nnn minutes. */
    /* 220 Service ready for new user. */
    /* 421 Service not available, closing control connection. */
    i = ftp_getrc_msg(f, resp, sizeof resp);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: returned status %d", i);
    if (i == -1) {
    return ap_proxyerror(r, HTTP_BAD_GATEWAY,
                             "Error reading from remote server");
    }
#if 0
    if (i == 120) {
    /* RFC2068 states:
     * 14.38 Retry-After
     *
     *  The Retry-After response-header field can be used with a 503 (Service
     *  Unavailable) response to indicate how long the service is expected to
     *  be unavailable to the requesting client. The value of this field can
     *  be either an HTTP-date or an integer number of seconds (in decimal)
     *  after the time of the response.
     *     Retry-After  = "Retry-After" ":" ( HTTP-date | delta-seconds )
     */
    ap_set_header("Retry-After", apr_psprintf(p, "%u", 60*wait_mins);
    return ap_proxyerror(r, HTTP_SERVICE_UNAVAILABLE, resp);
    }
#endif
    if (i != 220) {
        return ap_proxyerror(r, HTTP_BAD_GATEWAY, resp);
    }

    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: connected.");

    ap_bvputs(f, "USER ", user, CRLF, NULL);
    ap_bflush(f);            /* capture any errors */
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: USER %s", user);

/* possible results; 230, 331, 332, 421, 500, 501, 530 */
/* states: 1 - error, 2 - success; 3 - send password, 4,5 fail */
    /* 230 User logged in, proceed. */
    /* 331 User name okay, need password. */
    /* 332 Need account for login. */
    /* 421 Service not available, closing control connection. */
    /* 500 Syntax error, command unrecognized. */
    /*     (This may include errors such as command line too long.) */
    /* 501 Syntax error in parameters or arguments. */
    /* 530 Not logged in. */
    i = ftp_getrc(f);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: returned status %d", i);
    if (i == -1) {
        return ap_proxyerror(r, HTTP_BAD_GATEWAY,
                             "Error reading from remote server");
    }
    if (i == 530) {
        return ftp_unauthorized (r, 1);    /* log it: user name guessing attempt? */
    }
    if (i != 230 && i != 331) {
        return HTTP_BAD_GATEWAY;
    }

    if (i == 331) {        /* send password */
        if (password == NULL) {
            return ftp_unauthorized (r, 0);
        }
        ap_bvputs(f, "PASS ", password, CRLF, NULL);
        ap_bflush(f);
        ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                     "FTP: PASS %s", password);
/* possible results 202, 230, 332, 421, 500, 501, 503, 530 */
        /* 230 User logged in, proceed. */
        /* 332 Need account for login. */
        /* 421 Service not available, closing control connection. */
        /* 500 Syntax error, command unrecognized. */
        /* 501 Syntax error in parameters or arguments. */
        /* 503 Bad sequence of commands. */
        /* 530 Not logged in. */
        i = ftp_getrc(f);
        ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                     "FTP: returned status %d", i);
        if (i == -1) {
            return ap_proxyerror(r, HTTP_BAD_GATEWAY, "Error reading from remote server");
        }
        if (i == 332) {
            return ap_proxyerror(r, HTTP_UNAUTHORIZED, "Need account for login");
        }
        /* @@@ questionable -- we might as well return a 403 Forbidden here */
        if (i == 530) {
            return ftp_unauthorized (r, 1); /* log it: passwd guessing attempt? */
        }
        if (i != 230 && i != 202) {
            return HTTP_BAD_GATEWAY;
        }
    }

/* set the directory (walk directory component by component):
 * this is what we must do if we don't know the OS type of the remote
 * machine
 */
    for (;;) {
        strp = strchr(path, '/');
        if (strp == NULL)
            break;
        *strp = '\0';

        len = decodeenc(path);
        ap_bvputs(f, "CWD ", path, CRLF, NULL);
        ap_bflush(f);
        ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                     "FTP: CWD %s", path);
        *strp = '/';
/* responses: 250, 421, 500, 501, 502, 530, 550 */
        /* 250 Requested file action okay, completed. */
        /* 421 Service not available, closing control connection. */
        /* 500 Syntax error, command unrecognized. */
        /* 501 Syntax error in parameters or arguments. */
        /* 502 Command not implemented. */
        /* 530 Not logged in. */
        /* 550 Requested action not taken. */
        i = ftp_getrc(f);
        ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                     "FTP: returned status %d", i);
        if (i == -1) {
            return ap_proxyerror(r, HTTP_BAD_GATEWAY,
                                 "Error reading from remote server");
        }
        if (i == 550) {
            return HTTP_NOT_FOUND;
        }
        if (i != 250) {
            return HTTP_BAD_GATEWAY;
        }

        path = strp + 1;
    }

    if (parms != NULL && strncmp(parms, "type=", 5) == 0) {
    parms += 5;
    if ((parms[0] != 'd' && parms[0] != 'a' && parms[0] != 'i') ||
        parms[1] != '\0')
        parms = "";
    }
    else
    parms = "";

    /* changed to make binary transfers the default */

    if (parms[0] != 'a') {
    /* set type to image */
    /* TM - Added \015\012 to the end of TYPE I, otherwise it hangs the
       connection */
    ap_bputs("TYPE I" CRLF, f);
    ap_bflush(f);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: TYPE I");
/* responses: 200, 421, 500, 501, 504, 530 */
    /* 200 Command okay. */
    /* 421 Service not available, closing control connection. */
    /* 500 Syntax error, command unrecognized. */
    /* 501 Syntax error in parameters or arguments. */
    /* 504 Command not implemented for that parameter. */
    /* 530 Not logged in. */
    i = ftp_getrc(f);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: returned status %d", i);
    if (i == -1) {
        return ap_proxyerror(r, HTTP_BAD_GATEWAY,
                                 "Error reading from remote server");
    }
    if (i != 200 && i != 504) {
        return HTTP_BAD_GATEWAY;
    }
/* Allow not implemented */
    if (i == 504)
        parms[0] = '\0';
    }

/* try to set up PASV data connection first */
    if ((apr_create_tcp_socket(&dsock, r->pool)) != APR_SUCCESS) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                      "proxy: error creating PASV socket");
        ap_bclose(f);
        return HTTP_INTERNAL_SERVER_ERROR;
    }

    if (conf->recv_buffer_size > 0 && apr_setsocketopt(dsock, APR_SO_RCVBUF,conf->recv_buffer_size)) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
             "setsockopt(SO_RCVBUF): Failed to set ProxyReceiveBufferSize, using default");
    }

    ap_bputs("PASV" CRLF, f);
    ap_bflush(f);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: PASV command issued");
/* possible results: 227, 421, 500, 501, 502, 530 */
    /* 227 Entering Passive Mode (h1,h2,h3,h4,p1,p2). */
    /* 421 Service not available, closing control connection. */
    /* 500 Syntax error, command unrecognized. */
    /* 501 Syntax error in parameters or arguments. */
    /* 502 Command not implemented. */
    /* 530 Not logged in. */
    i = ap_bgets(pasv, sizeof(pasv), f);
    if (i == -1) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r,
                      "PASV: control connection is toast");
        apr_close_socket(dsock);
        ap_bclose(f);
        return HTTP_INTERNAL_SERVER_ERROR;
    }
    else {
        pasv[i - 1] = '\0';
        pstr = strtok(pasv, " ");    /* separate result code */
        if (pstr != NULL) {
            presult = atoi(pstr);
            if (*(pstr + strlen(pstr) + 1) == '=')
                pstr += strlen(pstr) + 2;
            else
            {
                pstr = strtok(NULL, "(");  /* separate address & port params */
                if (pstr != NULL)
                    pstr = strtok(NULL, ")");
            }
        }
        else
            presult = atoi(pasv);

        ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                     "FTP: returned status %d", presult);

        if (presult == 227 && pstr != NULL && (sscanf(pstr,
                                                      "%d,%d,%d,%d,%d,%d", &h3, &h2, &h1, &h0, &p1, &p0) == 6)) {
            /* pardon the parens, but it makes gcc happy */
            destaddr.s_addr = htonl((((((h3 << 8) + h2) << 8) + h1) << 8) + h0);
            pport = (p1 << 8) + p0;
            ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                         "FTP: contacting host %d.%d.%d.%d:%d",
                         h3, h2, h1, h0, pport);

            if (ap_proxy_doconnect(dsock, inet_ntoa(destaddr), pport, r) == -1) {
                return ap_proxyerror(r, HTTP_BAD_GATEWAY,
                                     apr_pstrcat(r->pool,
                                                "Could not connect to remote machine: ",
                                                strerror(errno), NULL));
            }
            else {
                pasvmode = 1;
            }
        }
        else
            apr_close_socket(dsock);    /* and try the regular way */
    }

    if (!pasvmode) {        /* set up data connection */

        if ((apr_create_tcp_socket(&dsock, r->pool)) != APR_SUCCESS) {
            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                          "proxy: error creating socket");
            ap_bclose(f);
            return HTTP_INTERNAL_SERVER_ERROR;
        }
        apr_get_local_port(&npport, sock);
        apr_get_local_ipaddr(&npaddr, sock);
        apr_set_local_port(dsock, npport);
        apr_set_local_ipaddr(dsock, npaddr);

        if (apr_setsocketopt(dsock, APR_SO_REUSEADDR, one) != APR_SUCCESS) {
#ifndef _OSD_POSIX /* BS2000 has this option "always on" */
            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                          "proxy: error setting reuseaddr option");
            apr_close_socket(dsock);
            ap_bclose(f);
            return HTTP_INTERNAL_SERVER_ERROR;
#endif /*_OSD_POSIX*/
        }

        if (apr_bind(dsock) != APR_SUCCESS) {
            char buff[22];

            apr_snprintf(buff, sizeof(buff), "%s:%d", npaddr, npport);
            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                          "proxy: error binding to ftp data socket %s", buff);
            ap_bclose(f);
            apr_close_socket(dsock);
            return HTTP_INTERNAL_SERVER_ERROR;
        }
        apr_listen(dsock, 2);    /* only need a short queue */
    }

/* set request; "path" holds last path component */
    len = decodeenc(path);

    /* TM - if len == 0 then it must be a directory (you can't RETR nothing) */

    if (len == 0) {
        parms = "d";
    }
    else {
        ap_bvputs(f, "SIZE ", path, CRLF, NULL);
        ap_bflush(f);
        ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                     "FTP: SIZE %s", path);
        i = ftp_getrc_msg(f, resp, sizeof resp);
        ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                     "FTP: returned status %d with response %s", i, resp);
        if (i != 500) {        /* Size command not recognized */
            if (i == 550) {    /* Not a regular file */
                ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                             "FTP: SIZE shows this is a directory");
                parms = "d";
                ap_bvputs(f, "CWD ", path, CRLF, NULL);
                ap_bflush(f);
                ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                             "FTP: CWD %s", path);
                i = ftp_getrc(f);
                /* possible results: 250, 421, 500, 501, 502, 530, 550 */
                /* 250 Requested file action okay, completed. */
                /* 421 Service not available, closing control connection. */
                /* 500 Syntax error, command unrecognized. */
                /* 501 Syntax error in parameters or arguments. */
                /* 502 Command not implemented. */
                /* 530 Not logged in. */
                /* 550 Requested action not taken. */
                ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                             "FTP: returned status %d", i);
                if (i == -1) {
                    return ap_proxyerror(r, HTTP_BAD_GATEWAY,
                                         "Error reading from remote server");
                }
                if (i == 550) {
                    return HTTP_NOT_FOUND;
                }
                if (i != 250) {
                    return HTTP_BAD_GATEWAY;
                }
                path = "";
                len = 0;
            }
            else if (i == 213) { /* Size command ok */
                for (j = 0; j < sizeof resp && apr_isdigit(resp[j]); j++)
                    ;
                resp[j] = '\0';
                if (resp[0] != '\0')
                    size = apr_pstrdup(p, resp);
            }
        }
    }

#ifdef AUTODETECT_PWD
    ap_bvputs(f, "PWD", CRLF, NULL);
    ap_bflush(f);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: PWD");
/* responses: 257, 500, 501, 502, 421, 550 */
    /* 257 "<directory-name>" <commentary> */
    /* 421 Service not available, closing control connection. */
    /* 500 Syntax error, command unrecognized. */
    /* 501 Syntax error in parameters or arguments. */
    /* 502 Command not implemented. */
    /* 550 Requested action not taken. */
    i = ftp_getrc_msg(f, resp, sizeof resp);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: PWD returned status %d", i);
    if (i == -1 || i == 421) {
    return ap_proxyerror(r, HTTP_BAD_GATEWAY,
                             "Error reading from remote server");
    }
    if (i == 550) {
    return HTTP_NOT_FOUND;
    }
    if (i == 257) {
    const char *dirp = resp;
    cwd = ap_getword_conf(r->pool, &dirp);
    }
#endif /*AUTODETECT_PWD*/

    if (parms[0] == 'd') {
        if (len != 0)
            ap_bvputs(f, "LIST ", path, CRLF, NULL);
        else
            ap_bputs("LIST -lag" CRLF, f);
        ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                     "FTP: LIST %s", (len == 0 ? "" : path));
    }
    else {
        ap_bvputs(f, "RETR ", path, CRLF, NULL);
        ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                     "FTP: RETR %s", path);
    }
    ap_bflush(f);
/* RETR: 110, 125, 150, 226, 250, 421, 425, 426, 450, 451, 500, 501, 530, 550
   NLST: 125, 150, 226, 250, 421, 425, 426, 450, 451, 500, 501, 502, 530 */
    /* 110 Restart marker reply. */
    /* 125 Data connection already open; transfer starting. */
    /* 150 File status okay; about to open data connection. */
    /* 226 Closing data connection. */
    /* 250 Requested file action okay, completed. */
    /* 421 Service not available, closing control connection. */
    /* 425 Can't open data connection. */
    /* 426 Connection closed; transfer aborted. */
    /* 450 Requested file action not taken. */
    /* 451 Requested action aborted. Local error in processing. */
    /* 500 Syntax error, command unrecognized. */
    /* 501 Syntax error in parameters or arguments. */
    /* 530 Not logged in. */
    /* 550 Requested action not taken. */
    rc = ftp_getrc(f);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: returned status %d", rc);
    if (rc == -1) {
    return ap_proxyerror(r, HTTP_BAD_GATEWAY,
                             "Error reading from remote server");
    }
    if (rc == 550) {
        ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                     "FTP: RETR failed, trying LIST instead");
    parms = "d";
    ap_bvputs(f, "CWD ", path, CRLF, NULL);
    ap_bflush(f);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: CWD %s", path);
    /* possible results: 250, 421, 500, 501, 502, 530, 550 */
    /* 250 Requested file action okay, completed. */
    /* 421 Service not available, closing control connection. */
    /* 500 Syntax error, command unrecognized. */
    /* 501 Syntax error in parameters or arguments. */
    /* 502 Command not implemented. */
    /* 530 Not logged in. */
    /* 550 Requested action not taken. */
    rc = ftp_getrc(f);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: returned status %d", rc);
    if (rc == -1) {
        return ap_proxyerror(r, HTTP_BAD_GATEWAY,
                                 "Error reading from remote server");
    }
    if (rc == 550) {
        return HTTP_NOT_FOUND;
    }
    if (rc != 250) {
        return HTTP_BAD_GATEWAY;
    }

#ifdef AUTODETECT_PWD
    ap_bvputs(f, "PWD", CRLF, NULL);
    ap_bflush(f);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: PWD");
/* responses: 257, 500, 501, 502, 421, 550 */
    /* 257 "<directory-name>" <commentary> */
    /* 421 Service not available, closing control connection. */
    /* 500 Syntax error, command unrecognized. */
    /* 501 Syntax error in parameters or arguments. */
    /* 502 Command not implemented. */
    /* 550 Requested action not taken. */
    i = ftp_getrc_msg(f, resp, sizeof resp);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: PWD returned status %d", i);
    if (i == -1 || i == 421) {
        return ap_proxyerror(r, HTTP_BAD_GATEWAY,
                                 "Error reading from remote server");
    }
    if (i == 550) {
        return HTTP_NOT_FOUND;
    }
    if (i == 257) {
        const char *dirp = resp;
        cwd = ap_getword_conf(r->pool, &dirp);
    }
#endif /*AUTODETECT_PWD*/

    ap_bputs("LIST -lag" CRLF, f);
    ap_bflush(f);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: LIST -lag");
    rc = ftp_getrc(f);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: returned status %d", rc);
    if (rc == -1)
        return ap_proxyerror(r, HTTP_BAD_GATEWAY,
                 "Error reading from remote server");
    }
    if (rc != 125 && rc != 150 && rc != 226 && rc != 250)
    return HTTP_BAD_GATEWAY;

    r->status = HTTP_OK;
    r->status_line = "200 OK";
    resp_hdrs = apr_make_table(p, 2);

    apr_rfc822_date(dates, r->request_time);
    apr_table_setn(resp_hdrs, "Date", dates);
    apr_table_setn(resp_hdrs, "Server", ap_get_server_version());

    if (parms[0] == 'd')
        apr_table_setn(resp_hdrs, "Content-Type", "text/html");
    else {
    if (r->content_type != NULL) {
        apr_table_setn(resp_hdrs, "Content-Type", r->content_type);
        ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                     "FTP: Content-Type set to %s", r->content_type);
    }
    else {
        apr_table_setn(resp_hdrs, "Content-Type", ap_default_type(r));
    }
    if (parms[0] != 'a' && size != NULL) {
        /* We "trust" the ftp server to really serve (size) bytes... */
        apr_table_setn(resp_hdrs, "Content-Length", size);
        ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                     "FTP: Content-Length set to %s", size);
    }
    }
    if (r->content_encoding != NULL && r->content_encoding[0] != '\0') {
        ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                     "FTP: Content-Encoding set to %s", r->content_encoding);
        apr_table_setn(resp_hdrs, "Content-Encoding", r->content_encoding);
    }
    ap_cache_el_header_merge(c, resp_hdrs);

/* check if NoCache directive on this host */
    for (i = 0; i < conf->nocaches->nelts; i++) {
    if ((ncent[i].name != NULL && ap_strstr_c(host, ncent[i].name) != NULL)
        || destaddr.s_addr == ncent[i].addr.s_addr || ncent[i].name[0] == '*')
        nocache = 1;
    }

    if(nocache || !ap_proxy_cache_should_cache(r, resp_hdrs, 0))
        ap_proxy_cache_error(&c);
    else
        ap_cache_el_data(c, &cachefp);

    if (!pasvmode) {        /* wait for connection */
        for(;;)
        {
            switch(apr_accept(&inc, dsock, r->pool))
            {
            case APR_EINTR:
                continue;
            case APR_SUCCESS:
                break;
            default:
                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                              "proxy: failed to accept data connection");
                apr_close_socket(dsock);
                ap_bclose(f);
                if (c != NULL) ap_proxy_cache_error(&c);
                return HTTP_BAD_GATEWAY;
            }
        }
        data = ap_bcreate(p, B_RDWR);
        ap_bpush_socket(f, csd);
    }
    else {
        data = ap_bcreate(p, B_RDWR);
        ap_bpush_socket(data, dsock);
    }

/* send response */
/* write status line */
    if (!r->assbackwards)
    ap_rvputs(r, "HTTP/1.0 ", r->status_line, CRLF, NULL);
    if (cachefp    && apr_puts(apr_pstrcat(r->pool, "HTTP/1.0 ", r->status_line, CRLF, NULL), cachefp) != APR_SUCCESS) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                      "proxy: error writing CRLF to cache");
        ap_proxy_cache_error(&c);
        cachefp = NULL;
    }

/* send headers */
    ap_cache_el_header_walk(c, ap_proxy_send_hdr_line, r, NULL);
    if (!r->assbackwards)
        ap_rputs(CRLF, r);
    if (cachefp && apr_puts(CRLF, cachefp) == -1) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                      "proxy: error writing CRLF to cache");
        ap_proxy_cache_error(&c);
        cachefp = NULL;
    }

    ap_bsetopt(r->connection->client, BO_BYTECT, &zero);
    r->sent_bodyct = 1;
/* send body */
    if (!r->header_only) {
        if (parms[0] != 'd') {
            /* we don't need no steekin' cache completion*/
            ap_proxy_send_fb(NULL, data, r, c);
        } else
        send_dir(data, r, c, cwd);

    if (rc == 125 || rc == 150)
        rc = ftp_getrc(f);

    /* XXX: we checked for 125||150||226||250 above. This is redundant. */
    if (rc != 226 && rc != 250)
            /* XXX: we no longer log an "error writing to c->tempfile" - should we? */
        ap_proxy_cache_error(&c);
    }
    else {
/* abort the transfer */
    ap_bputs("ABOR" CRLF, f);
    ap_bflush(f);
    if (!pasvmode)
        ap_bclose(data);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: ABOR");
/* responses: 225, 226, 421, 500, 501, 502 */
    /* 225 Data connection open; no transfer in progress. */
    /* 226 Closing data connection. */
    /* 421 Service not available, closing control connection. */
    /* 500 Syntax error, command unrecognized. */
    /* 501 Syntax error in parameters or arguments. */
    /* 502 Command not implemented. */
    i = ftp_getrc(f);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: returned status %d", i);
    }

/* finish */
    ap_bputs("QUIT" CRLF, f);
    ap_bflush(f);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: QUIT");
/* responses: 221, 500 */
    /* 221 Service closing control connection. */
    /* 500 Syntax error, command unrecognized. */
    i = ftp_getrc(f);
    ap_log_error(APLOG_MARK, APLOG_DEBUG|APLOG_NOERRNO, 0, NULL,
                 "FTP: QUIT: status %d", i);
    if (pasvmode)
    ap_bclose(data);
    ap_bclose(f);

    ap_rflush(r);    /* flush before garbage collection */

    if(c) ap_proxy_cache_update(c);
    return OK;
}