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- /* ====================================================================
- * Copyright (c) 1995-1997 The Apache Group. 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. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the Apache Group
- * for use in the Apache HTTP server project (http://www.apache.org/)."
- *
- * 4. The names "Apache Server" and "Apache Group" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission.
- *
- * 5. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the Apache Group
- * for use in the Apache HTTP server project (http://www.apache.org/)."
- *
- * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``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 GROUP 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 Group and was originally based
- * on public domain software written at the National Center for
- * Supercomputing Applications, University of Illinois, Urbana-Champaign.
- * For more information on the Apache Group and the Apache HTTP server
- * project, please see <http://www.apache.org/>.
- *
- */
-
- /*
- * rfc1413() speaks a common subset of the RFC 1413, AUTH, TAP and IDENT
- * protocols. The code queries an RFC 1413 etc. compatible daemon on a remote
- * host to look up the owner of a connection. The information should not be
- * used for authentication purposes. This routine intercepts alarm signals.
- *
- * Diagnostics are reported through syslog(3).
- *
- * Author: Wietse Venema, Eindhoven University of Technology,
- * The Netherlands.
- */
-
- /* Some small additions for Apache --- ditch the "sccsid" var if
- * compiling with gcc (it *has* changed), include conf.h for the
- * prototypes it defines on at least one system (SunlOSs) which has
- * them missing from the standard header files, and one minor change
- * below (extra parens around assign "if (foo = bar) ..." to shut up
- * gcc -Wall).
- */
-
- /* Rewritten by David Robinson */
-
- #include "httpd.h" /* for server_rec, conn_rec, ap_longjmp, etc. */
- #include "http_log.h" /* for log_unixerr */
- #include "rfc1413.h"
-
- #ifndef SCO
- extern char *strchr();
- extern char *inet_ntoa();
- #endif
-
- /* Local stuff. */
- /* Semi-well-known port */
- #define RFC1413_PORT 113
- /* maximum allowed length of userid */
- #define RFC1413_USERLEN 512
- /* rough limit on the amount of data we accept. */
- #define RFC1413_MAXDATA 1000
-
- #ifndef RFC1413_TIMEOUT
- #define RFC1413_TIMEOUT 30
- #endif
- #define ANY_PORT 0 /* Any old port will do */
- #define FROM_UNKNOWN "unknown"
-
- int rfc1413_timeout = RFC1413_TIMEOUT; /* Global so it can be changed */
-
- JMP_BUF timebuf;
-
- /* bind_connect - bind both ends of a socket */
-
- static int
- get_rfc1413(int sock, const struct sockaddr_in *our_sin,
- const struct sockaddr_in *rmt_sin, char user[256], server_rec *srv)
- {
- struct sockaddr_in rmt_query_sin, our_query_sin;
- unsigned int rmt_port, our_port;
- int i;
- char *cp;
- char buffer[RFC1413_MAXDATA+1];
-
- /*
- * Bind the local and remote ends of the query socket to the same
- * IP addresses as the connection under investigation. We go
- * through all this trouble because the local or remote system
- * might have more than one network address. The RFC1413 etc.
- * client sends only port numbers; the server takes the IP
- * addresses from the query socket.
- */
-
- our_query_sin = *our_sin;
- our_query_sin.sin_port = htons(ANY_PORT);
- rmt_query_sin = *rmt_sin;
- rmt_query_sin.sin_port = htons(RFC1413_PORT);
-
- if (bind(sock, (struct sockaddr *)&our_query_sin,
- sizeof(struct sockaddr_in)) < 0)
- {
- log_unixerr("bind", NULL, "rfc1413: Error binding to local port", srv);
- return -1;
- }
-
- /*
- * errors from connect usually imply the remote machine doesn't support
- * the service
- */
- if (connect(sock, (struct sockaddr *)&rmt_query_sin,
- sizeof(struct sockaddr_in)) < 0)
- return -1;
-
- /* send the data */
- ap_snprintf(buffer, sizeof(buffer), "%u,%u\r\n", ntohs(rmt_sin->sin_port),
- ntohs(our_sin->sin_port));
- do i = write(sock, buffer, strlen(buffer));
- while (i == -1 && errno == EINTR);
- if (i == -1)
- {
- log_unixerr("write", NULL, "rfc1413: error sending request", srv);
- return -1;
- }
-
- /*
- * Read response from server. We assume that all the data
- * comes in a single packet.
- */
-
- do i = read(sock, buffer, RFC1413_MAXDATA);
- while (i == -1 && errno == EINTR);
- if (i == -1)
- {
- log_unixerr("read", NULL, "rfc1413: error reading response", srv);
- return -1;
- }
-
- buffer[i] = '\0';
- /* RFC1413_USERLEN = 512 */
- if (sscanf(buffer, "%u , %u : USERID :%*[^:]:%512s", &rmt_port, &our_port,
- user) != 3 || ntohs(rmt_sin->sin_port) != rmt_port
- || ntohs(our_sin->sin_port) != our_port) return -1;
-
- /*
- * Strip trailing carriage return. It is part of the
- * protocol, not part of the data.
- */
-
- if ((cp = strchr(user, '\r'))) *cp = '\0';
-
- return 0;
- }
-
- /* ident_timeout - handle timeouts */
- static void
- ident_timeout(int sig)
- {
- ap_longjmp(timebuf, sig);
- }
-
- /* rfc1413 - return remote user name, given socket structures */
- char *
- rfc1413(conn_rec *conn, server_rec *srv)
- {
- static char user[RFC1413_USERLEN+1]; /* XXX */
- static char *result;
- static int sock;
-
- result = FROM_UNKNOWN;
-
- sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
- if (sock < 0)
- {
- log_unixerr("socket", NULL, "rfc1413: error creating socket", srv);
- conn->remote_logname = result;
- }
-
- /*
- * Set up a timer so we won't get stuck while waiting for the server.
- */
- if (ap_setjmp(timebuf) == 0)
- {
- signal(SIGALRM, ident_timeout);
- alarm(rfc1413_timeout);
-
- if (get_rfc1413(sock, &conn->local_addr, &conn->remote_addr, user,
- srv)
- >= 0)
- result = user;
-
- alarm(0);
- }
- close(sock);
- conn->remote_logname = result;
-
- return conn->remote_logname;
- }
-