Fix a parsing bug in the rules that would ignore the very first rule. See #23.

- Add an error message when the configuration file could not be found.
 - Log to stderr when running in the foreground.

.gitignore

@@ -1,5 +1,6 @@
 .auto
 .deps
+.dirstamp
 Makefile
 Makefile.in
 stamp-*
@@ -13,4 +14,8 @@ configure
 
 *.o
 rinetd
+rinetd.exe
 
+*.vcxproj.user
+Debug
+Release

CHANGES.md

@@ -1,4 +1,29 @@
-## Version 0.63
+## Version 0.73 (2021/02/19)
+
+ * improve error reporting
+ * fixed another configuration parsing bug
+
+## Version 0.72 (2021/02/16)
+
+ * fixed a configuration parsing bug making 0.71 almost unusable
+
+## Version 0.71 (2021/02/14)
+
+ * IPv6 support
+ * fixed a display overflow in data usage statistics
+ * made the configuration parser more tolerant with service names that contain
+   dashes (e.g. snmp-trap) or hostnames with underscores (e.g. \_http.example.com).
+ * create the log file if it does not exist
+ * new Visual Studio project file
+
+## Version 0.70 (2017/09/09)
+
+ * UDP support
+ * source address binding support
+ * use a real grammar for the configuration file and get rid of the hand-made
+   parser
+
+## Version 0.63 (2017/07/19)
 
  * added a `-f` flag to run in the foreground
  * quit cleanly when `SIGINT` is received

COPYING

@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
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+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
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+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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+
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+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+to attach them to the start of each source file to most effectively
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+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
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+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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+
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+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
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+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

Makefile.am

@@ -1,25 +1,18 @@
 
 AUTOMAKE_OPTIONS = foreign dist-bzip2
 
-EXTRA_DIST = bootstrap CHANGES.md README.md index.html \
-	getopt.c getopt.h $(man_MANS) $(sysconf_DATA)
+SUBDIRS = src
+
+EXTRA_DIST = bootstrap COPYING CHANGES.md README.md index.html rinetd.vcxproj \
+	$(man_MANS) $(sysconf_DATA)
 
 man_MANS = rinetd.8
 sysconf_DATA = rinetd.conf
+noinst_DATA = index.html
 
-sbin_PROGRAMS = rinetd
-rinetd_SOURCES = rinetd.c rinetd.h parse.h match.c match.h
-
-GENERATED_SOURCES = parse.h
-
-# If peg/leg is available, regenerate parse.h
-parse.h: parse.peg
-	if which leg >/dev/null 2>&1; then leg -o $@ $^; else touch $@; fi
-
-# _POSIX_C_SOURCE is for SA_RESTART and others
-# _XOPEN_SOURCE is for struct sigaction
-# _GNU_SOURCE is for h_errno and gethostbyname-related macros
-rinetd_CFLAGS = -std=c99 -D_XOPEN_SOURCE -D_GNU_SOURCE -D_POSIX_C_SOURCE=200809L -Wall -Wextra -Wwrite-strings -I.
+# If roffit is available, regenerate index.html
+index.html: rinetd.8
+	if which roffit >/dev/null 2>&1; then roffit < $^ > $@; else touch $@; fi
 
 # This is for Travis CI; we don’t have a testsuite yet.
 test:

configure.ac

@@ -1,9 +1,9 @@
 # Process this file with autoconf to produce a configure script.
 AC_PREREQ(2.52)
-AC_INIT(rinetd, 0.63, sam@hocevar.net)
+AC_INIT(rinetd, 0.73, sam@hocevar.net)
 AC_CONFIG_AUX_DIR(.auto)
-AC_CONFIG_SRCDIR([getopt.h])
-AC_CONFIG_HEADER([config.h])
+AC_CONFIG_SRCDIR([src/rinetd.c])
+AC_CONFIG_HEADER([src/config.h])
 AM_INIT_AUTOMAKE([no-define tar-ustar silent-rules])
 
 # Checks for programs.
@@ -21,6 +21,8 @@ AC_CHECK_HEADERS([arpa/inet.h errno.h fcntl.h netdb.h netinet/in.h stdlib.h stri
 AC_C_CONST
 AC_HEADER_TIME
 AC_STRUCT_TM
+AC_CHECK_TYPES(ssize_t, [], [],
+  [#include <sys/types.h>])
 AC_CHECK_TYPES(socklen_t, [], [],
   [#include <sys/types.h>
    #include <sys/socket.h>])
@@ -34,4 +36,5 @@ AC_FUNC_STRFTIME
 AC_CHECK_FUNCS([gethostbyname memset select socket strstr daemon fork sigaction])
 
 AC_CONFIG_FILES([Makefile])
+AC_CONFIG_FILES([src/Makefile])
 AC_OUTPUT

index.html

@@ -1,232 +1,140 @@
-<html>
-<head>
-<title>RINETD(8)</title>
-<style>
-body {
-  background-color: #fffff0;
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
+ "http://www.w3.org/TR/html4/loose.dtd">
+<html><head>
+<title>rinetd man page</title>
+<meta name="generator" content="roffit">
+<STYLE type="text/css">
+P.level0 {
+ padding-left: 2em;
 }
-h3 {
-  color: #ff8888;
+
+P.level1 {
+ padding-left: 4em;
 }
-blockquote,code {
-  font-family: consolas, monospace, fixed;
-  font-size: 0.9em;
-  font-weight: bold;
-  color: #555555;
+
+P.level2 {
+ padding-left: 6em;
 }
-</style>
-</head>
-<body>
-<!--
- Copyright (c) 1997, 1998, 1999, Thomas Boutell and Boutell.Com, Inc.
- This software is released for free use under the terms of
- the GNU General Public License, version 2 or higher.
--->
-<table>
- <tr>
-  <th width=33% align=left>RINETD(8)
-  <th width=33% align=right>Unix System Manager's Manual
-  <th width=33% align=right>RINETD(8)
- </tr>
-</table>
 
-<h3>NAME</h3>
+span.emphasis {
+ font-style: italic;
+}
 
-<p> rinetd -- internet “redirection server”</p>
+span.bold {
+ font-weight: bold;
+}
 
-<h3>SYNOPSIS</h3>
+span.manpage {
+ font-weight: bold;
+}
 
-<p> <code>/usr/sbin/rinetd</code></p>
+h2.nroffsh {
+ background-color: #e0e0e0;
+}
 
-<h3>VERSION</h3>
+span.nroffip {
+ font-weight: bold;
+ font-size: 120%;
+ font-family: monospace;
+}
 
-<p> Version 0.63, 2017/07/19. Version 0.63 corrects several bugs including a
-denial of service security issue, and greatly improves performance, ease of
-use, and portability. </p>
+p.roffit {
+ text-align: center;
+ font-size: 80%;
+}
+</STYLE>
+</head><body>
 
-<h3>WHERE TO GET</h3>
- <p> <a href="https://github.com/samhocevar/rinetd/releases">By HTTP on
-GitHub</a> in the releases section. </p>
-
-<h3>DESCRIPTION</h3>
-
-<p> Redirects TCP connections from one IP address and port to another. rinetd
-is a single-process server which handles any number of connections to the
-address/port pairs specified in the file <code>/etc/rinetd.conf</code>. Since
-rinetd runs as a single process using nonblocking I/O, it is able to redirect
-a large number of connections without a severe impact on the machine. This
-makes it practical to run TCP services on machines inside an IP masquerading
-firewall. rinetd <strong>does not redirect FTP</strong>, because FTP requires
-more than one socket. </p>
-
-<p> rinetd is typically launched at boot time, using the following syntax: </p>
-
-<blockquote>/usr/sbin/rinetd</blockquote>
-
-<p> The configuration file is found in the file <code>/etc/rinetd.conf</code>,
-unless another file is specified using the <code>-c</code> command line option.
-</p>
-
-<h3>FORWARDING RULES</h3>
-
-<p> Most entries in the configuration file are forwarding rules. The format of
-a forwarding rule is as follows:
-  <blockquote>bindaddress bindport connectaddress connectport</blockquote>
-For example:
-  <blockquote>206.125.69.81 80 10.1.1.2 80</blockquote>
-Would redirect all connections to port 80 of the “real” IP address
-206.125.69.81, which could be a virtual interface, through rinetd to port 80
-of the address 10.1.1.2, which would typically be a machine on the inside of a
-firewall which has no direct routing to the outside world. </p>
-
-<p> Although responding on individual interfaces rather than on all interfaces
-is one of rinetd's primary features, sometimes it is preferable to respond on
-all IP addresses that belong to the server. In this situation, the special IP
-address <code>0.0.0.0</code> can be used. For example:
-  <blockquote>0.0.0.0 23 10.1.1.2 23</blockquote>
-Would redirect all connections to port 23, for all IP addresses assigned to the
-server. This is the default behavior for most other programs. </p>
-
-<p> Service names can be specified instead of port numbers. On most systems,
-service names are defined in the file /etc/services. </p>
-
-<p> Both IP addresses and hostnames are accepted for bindaddress and
-connectaddress. </p>
-
-<h3>ALLOW AND DENY RULES</h3>
-
-<p> Configuration files can also contain allow and deny rules. </p>
-
-<p> Allow rules which appear before the first forwarding rule are applied
-globally: if at least one global allow rule exists, and the address of a new
-connection does not satisfy at least one of the global allow rules, that
-connection is immediately rejected, regardless of any other rules. </p>
-
-<p> Allow rules which appear after a specific forwarding rule apply to that
-forwarding rule only. If at least one allow rule exists for a particular
-forwarding rule, and the address of a new connection does not satisfy at least
-one of the allow rules for that forwarding rule, that connection is immediately
-rejected, regardless of any other rules. </p>
-
-<p> Deny rules which appear before the first forwarding rule are applied
-globally: if the address of a new connection satisfies any of the global deny
-rules, that connection is immediately rejected, regardless of any other rules.
-</p>
-
-<p> Deny rules which appear after a specific forwarding rule apply to that
-forwarding rule only. If the address of a new connection satisfies any of the
-deny rules for that forwarding rule, that connection is immediately rejected,
-regardless of any other rules. </p>
-
-<p> The format of an allow rule is as follows:
-  <blockquote>allow pattern</blockquote>
-Patterns can contain the following characters: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, .
-(period), ?, and *. The ? wildcard matches any one character. The * wildcard
-matches any number of characters, including zero. </p>
-
-<p> For example: </p>
-
-<p> <blockquote>allow 206.125.69.*</blockquote>
-This allow rule matches all IP addresses in the 206.125.69 class C domain. </p>
-
-<p> Host names are NOT permitted in allow and deny rules. The performance cost
-of looking up IP addresses to find their corresponding names is prohibitive.
-Since rinetd is a single process server, all other connections would be forced
-to pause during the address lookup. </p>
-
-<h3>LOGGING</h3>
-
-<p> rinetd is able to produce a log file in either of two formats:
-tab-delimited and web server-style “common log format.” </p>
-
-<p> By default, rinetd does not produce a log file. To activate logging, add
-the following line to the configuration file:
-  <blockquote>logfile log-file-location</blockquote>
-Example:
-  <blockquote>logfile /var/log/rinetd.log</blockquote>
-By default, rinetd logs in a simple tab-delimited format containing the
-following information: </p>
-
-<ul>
- <li> Date and time </li>
- <li> Client address<br />
- <li> Listening host </li>
- <li> Listening port </li>
- <li> Forwarded-to host </li>
- <li> Forwarded-to port </li>
- <li> Bytes received from client </li>
- <li> Bytes sent to client </li>
- <li> Result message </li>
-</ul>
-
-<p> To activate web server-style “common log format” logging, add the following
-line to the configuration file:
-  <blockquote>logcommon</blockquote>
-</p>
-
-<h3>COMMAND LINE OPTIONS</h3>
-
-<p> The -c command line option is used to specify an alternate configuration
-file. </p>
-
-<p> The -f command line option is used to run rinetd in the foreground, without
-forking to the background. </p>
-
-<p> The -h command line option produces a short help message. </p>
-
-<p> The -v command line option displays the version number. </p>
-
-<h3>REINITIALIZING RINETD</h3>
-
-<p> The kill -1 signal (SIGHUP) can be used to cause rinetd to reload
-its configuration file <strong>without</strong> interrupting existing
-connections. Under Linux(tm) the process id is saved in the file
-<code>/var/run/rinetd.pid</code> to facilitate the kill -HUP. An alternate file
-name can be provided by using the <code>pidlogfile</code> configuration file
-option. </p>
-
-<h3>BUGS</h3>
-
-<p> The server redirected to is not able to identify the host the client
-really came from. This cannot be corrected; however, the log produced by
-rinetd provides a way to obtain this information. Under Unix, sockets would
-theoretically lose data when closed with <code>SO_LINGER</code> turned off, but
-in Linux this is not the case (kernel source comments support this belief on
-my part). On non-Linux Unix platforms, alternate code which uses a different
-trick to work around blocking <code>close()</code> is provided, but this code
-is untested. </p>
-
-<p> The logging is inadequate. The duration of the connection should be logged.
-</p>
-
-<h3>LICENSE</h3>
-
-<p> Copyright (c) 1997, 1998, 1999,
-<a href="http://www.boutell.com/boutell">Thomas Boutell</a> and
-<a href="http://www.boutell.com/">Boutell.Com, Inc.</a> </p>
-
-<p> Copyright (c) 2003&mdash;2017 <a href="https://github.com/samhocevar">Sam
-Hocevar</a> </p>
-
-<p> This software is released for free use under the terms of the GNU
-General Public License, version 2 or higher. </p>
-
-<h3>CONTACT INFORMATION</h3>
-
-<p> See <a href="https://github.com/samhocevar/rinetd/releases">the rinetd web
-page</a> for the latest release. </p>
-
-<p> Thomas Boutell can be reached by email: <a
-href="mailto:boutell@boutell.com">boutell@boutell.com</a> </p>
-
-<p> Sam Hocevar can be reached by email: <a
-href="mailto:sam@hocevar.net">sam@hocevar.net</a> </p>
-
-<h3>THANKS</h3>
-
-<p> Thanks are due to Bill Davidsen, Libor Pechachek, Sascha Ziemann, Joel
-S. Noble, the Apache Group, and many others who have contributed advice,
-encouragement and/or source code to this and other open software projects. </p>
-
-</body>
-</html>
+<p class="level0">
+<p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
+<p class="level0">rinetd - internet redirection server 
+<p class="level0"><a name="SYNOPSIS"></a><h2 class="nroffsh">SYNOPSIS</h2>
+<p class="level0"><span Class="bold">rinetd</span> [<span Class="bold">-f</span>] [<span Class="bold">-c</span> <span Class="emphasis">configuration</span>] 
+<p class="level0"><span Class="bold">rinetd -h</span> 
+<p class="level0"><span Class="bold">rinetd -v</span> 
+<p class="level0"><a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
+<p class="level0">
+<p class="level0"><span Class="bold">rinetd</span> redirects TCP or UDP connections from one IP address and port to another. <span Class="bold">rinetd</span> is a single-process server which handles any number of connections to the address/port pairs specified in the file <span Class="emphasis">/etc/rinetd.conf</span>. Since <span Class="bold">rinetd</span> runs as a single process using nonblocking I/O, it is able to redirect a large number of connections without a severe impact on the machine. This makes it practical to run services on machines inside an IP masquerading firewall. 
+<p class="level0"><span Class="bold">rinetd</span> is typically launched at boot time, using the following syntax: 
+<p class="level0"><span Class="bold">    /usr/sbin/rinetd</span> 
+<p class="level0">The configuration file is found in the file <span Class="emphasis">/etc/rinetd.conf</span>, unless another file is specified using the <span Class="bold">-c</span> command line option. 
+<p class="level0"><a name="OPTIONS"></a><h2 class="nroffsh">OPTIONS</h2>
+<p class="level0">
+<p class="level0"><span Class="bold">-f</span> Run <span Class="bold">rinetd</span> in the foreground, without forking to the background. 
+<p class="level0"><span Class="bold">-c</span> <span Class="emphasis">configuration</span> Specify an alternate configuration file. 
+<p class="level0"><span Class="bold">-v</span> Display the version number and exit. 
+<p class="level0"><span Class="bold">-h</span> Produce a short help message and exit. 
+<p class="level0"><a name="FORWARDING"></a><h2 class="nroffsh">FORWARDING RULES</h2>
+<p class="level0">
+<p class="level0">Most entries in the configuration file are forwarding rules. The format of a forwarding rule is as follows: 
+<p class="level0"><span Class="bold">    bindaddress bindport connectaddress connectport [options...]</span> 
+<p class="level0">For example: 
+<p class="level0"><span Class="bold">    206.125.69.81 80  10.1.1.2 80</span> 
+<p class="level0">Would redirect all connections to port 80 of the "real" IP address 206.125.69.81, which could be a virtual interface, through <span Class="bold">rinetd</span> to port 80 of the address 10.1.1.2, which would typically be a machine on the inside of a firewall which has no direct routing to the outside world. 
+<p class="level0">
+<p class="level0">is one of <span Class="bold">rinetd</span>'s primary features, sometimes it is preferable to respond on all IP addresses that belong to the server. In this situation, the special IP address 0.0.0.0 can be used. For example: 
+<p class="level0">
+<p class="level0"><span Class="bold">    0.0.0.0 23  10.1.1.2 23</span> 
+<p class="level0">Would redirect all connections to port 23, for all IP addresses assigned to the server. This is the default behavior for most other programs. 
+<p class="level0">Ports default to TCP. To specify the protocol, append <span Class="emphasis">/udp</span> or <span Class="emphasis">/tcp</span> to the port number: 
+<p class="level0"><span Class="bold">    206.125.69.81 80/tcp  10.1.1.2 8000/udp</span> 
+<p class="level0">Service names can be specified instead of port numbers. On most systems, service names are defined in the file <span Class="emphasis">/etc/services</span>. 
+<p class="level0">Both IP addresses and hostnames are accepted for bindaddress and connectaddress, including IPv6. 
+<p class="level0">
+<p class="level0"><a name="UDP"></a><h2 class="nroffsh">UDP timeout option</h2>
+<p class="level0">Since UDP is a connectionless protocol, a timeout is necessary or forwarding connections may accumulate with time and exhaust resources. By default, if no data is sent or received on a UDP connection for 72 seconds, the other connection is closed. This value can be changed using the <span Class="emphasis">timeout</span> option: 
+<p class="level0"><span Class="bold">    0.0.0.0 8000/udp  10.1.1.2 80  [timeout=3600]</span> 
+<p class="level0">This rule will forward all data received on UDP port 8000 to host 10.1.1.2 on TCP port 80, and will close the connection after no data is received on the UDP port for 3600 seconds. 
+<p class="level0"><a name="Source"></a><h2 class="nroffsh">Source address option</h2>
+<p class="level0">A forwarding rule option allows to bind to a specific local address when sending data to the other end. This is done using the <span Class="emphasis">src</span> option: 
+<p class="level0"><span Class="bold">    192.168.1.1 80  10.1.1.127 80  [src=10.1.1.2]</span> 
+<p class="level0">Assuming the local host has two IP addresses, 10.1.1.1 and 10.1.1.2, this rule ensures that forwarded packets are sent using source address 10.1.1.2. 
+<p class="level0"><a name="ALLOW"></a><h2 class="nroffsh">ALLOW AND DENY RULES</h2>
+<p class="level0">Configuration files can also contain allow and deny rules. 
+<p class="level0">Allow rules which appear before the first forwarding rule are applied globally: if at least one global allow rule exists, and the address of a new connection does not satisfy at least one of the global allow rules, that connection is immediately rejected, regardless of any other rules. 
+<p class="level0">Allow rules which appear after a specific forwarding rule apply to that forwarding rule only. If at least one allow rule exists for a particular forwarding rule, and the address of a new connection does not satisfy at least one of the allow rules for that forwarding rule, that connection is immediately rejected, regardless of any other rules. 
+<p class="level0">Deny rules which appear before the first forwarding rule are applied globally: if the address of a new connection satisfies any of the global deny rules, that connection is immediately rejected, regardless of any other rules. 
+<p class="level0">Deny rules which appear after a specific forwarding rule apply to that forwarding rule only. If the address of a new connection satisfies any of the deny rules for that forwarding rule, that connection is immediately rejected, regardless of any other rules. 
+<p class="level0">The format of an allow rule is as follows: 
+<p class="level0"><span Class="bold">    allow|deny pattern</span> 
+<p class="level0">Patterns can contain the following characters: <span Class="bold">0</span>, <span Class="bold">1</span>, <span Class="bold">2</span>, <span Class="bold">3</span>, <span Class="bold">4</span>, <span Class="bold">5</span>, <span Class="bold">6</span>, <span Class="bold">7</span>, <span Class="bold">8</span>, <span Class="bold">9</span>, <span Class="bold">.</span> (period), <span Class="bold">?</span>, and <span Class="bold">*</span>. The <span Class="bold">?</span> wildcard matches any one character. The <span Class="bold">*</span> wildcard matches any number of characters, including zero. 
+<p class="level0">For example: 
+<p class="level0"><span Class="bold">    allow 206.125.69.*</span> 
+<p class="level0">This allow rule matches all IP addresses in the 206.125.69 class C domain. 
+<p class="level0">Host names are NOT permitted in allow and deny rules. The performance cost of looking up IP addresses to find their corresponding names is prohibitive. Since <span Class="bold">rinetd</span> is a single process server, all other connections would be forced to pause during the address lookup. 
+<p class="level0"><a name="LOGGING"></a><h2 class="nroffsh">LOGGING</h2>
+<p class="level0"><span Class="bold">rinetd</span> is able to produce a log file in either of two formats: tab-delimited and web server-style "common log format". 
+<p class="level0">By default, <span Class="bold">rinetd</span> does not produce a log file. To activate logging, add the following line to the configuration file: 
+<p class="level0"><span Class="bold">    logfile log-file-location</span> 
+<p class="level0">Example: 
+<p class="level0"><span Class="bold">    logfile /var/log/rinetd.log</span> 
+<p class="level0">By default, <span Class="bold">rinetd</span> logs in a simple tab-delimited format containing the following information: 
+<p class="level0">&nbsp;   Date and time 
+<p class="level0">&nbsp;   Client address 
+<p class="level0">&nbsp;   Listening host 
+<p class="level0">&nbsp;   Listening port 
+<p class="level0">&nbsp;   Forwarded-to host 
+<p class="level0">&nbsp;   Forwarded-to port 
+<p class="level0">&nbsp;   Bytes received from client 
+<p class="level0">&nbsp;   Bytes sent to client 
+<p class="level0">&nbsp;   Result message 
+<p class="level0">To activate web server-style "common log format" logging, add the following line to the configuration file: 
+<p class="level0"><span Class="bold">    logcommon</span> 
+<p class="level0"><a name="REINITIALIZING"></a><h2 class="nroffsh">REINITIALIZING RINETD</h2>
+<p class="level0">
+<p class="level0">The <span Class="bold">kill -1</span> signal (<span Class="emphasis">SIGHUP</span>) can be used to cause <span Class="bold">rinetd</span> to reload its configuration file without interrupting existing connections. 
+<p class="level0">Under Linux(tm the process id is saved in the file <span Class="emphasis">/var/run/rinetd.pid</span> to facilitate the <span Class="bold">kill -HUP</span>. An alternate filename can be provided by using the pidlogfile configuration file option. 
+<p class="level0"><a name="BUGS"></a><h2 class="nroffsh">BUGS AND LIMITATIONS</h2>
+<p class="level0">
+<p class="level0"><span Class="bold">rinetd</span> only redirects protocols which use a single TCP or UDP socket. This rules out FTP. 
+<p class="level0">The server redirected to is not able to identify the host the client really came from. This cannot be corrected; however, the log produced by <span Class="bold">rinetd</span> provides a way to obtain this information. Under Unix, Sockets would theoretically lose data when closed with SO_LINGER turned off, but in Linux this is not the case (kernel source comments support this belief on my part). On non-Linux Unix platforms, alternate code which uses a different trick to work around blocking close() is provided, but this code is untested. 
+<p class="level0">The logging is inadequate. The duration of each connection should be logged. <a name="LICENSE"></a><h2 class="nroffsh">LICENSE</h2>
+<p class="level0">Copyright (c) 1997, 1998, 1999, Thomas Boutell and Boutell.Com, Inc. 
+<p class="level0">Copyright (c) 2003-2021 Sam Hocevar 
+<p class="level0">This software is released for free use under the terms of the GNU General Public License, version 2 or higher. NO WARRANTY IS EXPRESSED OR IMPLIED. USE THIS SOFTWARE AT YOUR OWN RISK. <a name="CONTACT"></a><h2 class="nroffsh">CONTACT INFORMATION</h2>
+<p class="level0">See https://github.com/samhocevar/rinetd/releases for the latest release. 
+<p class="level0">Thomas Boutell can be reached by email: boutell@boutell.com 
+<p class="level0">Sam Hocevar can be reached by email: sam@hocevar.net <a name="THANKS"></a><h2 class="nroffsh">THANKS</h2>
+<p class="level0">Thanks are due to Bill Davidsen, Libor Pechachek, Sascha Ziemann, the Apache Group, and many others who have contributed advice and/or source code to this and other free software projects. <p class="roffit">
+ This HTML page was made with <a href="http://daniel.haxx.se/projects/roffit/">roffit</a>.
+</body></html>

match.h

@@ -1,9 +0,0 @@
-#ifndef MATCH_H
-#define MATCH_H 1
-
-extern int match(char const *s, char const *p);
-extern int matchNoCase(char const *s, char const *p);
-extern int matchBody(char const *s, char const *p, int nocase);
-
-#endif /* MATCH_H */
-

parse.peg

@@ -1,182 +0,0 @@
-%{
-#define YY_CTX_LOCAL 1
-#define YY_CTX_MEMBERS \
-    FILE *fp; \
-    int currentLine; \
-    int isAuthAllow; \
-    unsigned int port, bindPort, connectPort; \
-    char *bindAddress, *connectAddress;
-#define YY_INPUT(yyctx, buf, result, max_size) \
-{ \
-    int yyc = fgetc(yyctx->fp); \
-    result = (EOF == yyc) ? 0 : (*(buf) = yyc, 1); \
-}
-#define PARSE_ERROR exit(1);
-%}
-
-file     =  (sol (line eol | invalid_syntax))*
-line     =  -? (rule | auth | logfile | pidlogfile | logcommon )? -? comment?
-
-comment  =  "#" (!eol .)*
-
-rule  =  bind_address - bind_port - connect_address - connect_port {
-	/* Turn all of this stuff into reasonable addresses */
-	struct in_addr iaddr;
-	if (getAddress(yy->bindAddress, &iaddr) < 0) {
-		fprintf(stderr, "rinetd: host %s could not be resolved.\n",
-			yy->bindAddress);
-		PARSE_ERROR;
-	}
-	/* Make a server socket */
-	SOCKET fd = socket(PF_INET, SOCK_STREAM, 0);
-	if (fd == INVALID_SOCKET) {
-		syslog(LOG_ERR, "couldn't create "
-			"server socket! (%m)\n");
-		PARSE_ERROR;
-	}
-	struct sockaddr_in saddr;
-	saddr.sin_family = AF_INET;
-	memcpy(&saddr.sin_addr, &iaddr, sizeof(iaddr));
-	saddr.sin_port = htons(yy->bindPort);
-	int tmp = 1;
-	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
-		(const char *) &tmp, sizeof(tmp));
-	if (bind(fd, (struct sockaddr *)
-		&saddr, sizeof(saddr)) == SOCKET_ERROR)
-	{
-		/* Warn -- don't exit. */
-		syslog(LOG_ERR, "couldn't bind to "
-			"address %s port %d (%m)\n",
-			yy->bindAddress, yy->bindPort);
-		closesocket(fd);
-		PARSE_ERROR;
-	}
-	if (listen(fd, RINETD_LISTEN_BACKLOG) == SOCKET_ERROR) {
-		/* Warn -- don't exit. */
-		syslog(LOG_ERR, "couldn't listen to "
-			"address %s port %d (%m)\n",
-			yy->bindAddress, yy->bindPort);
-		closesocket(fd);
-		PARSE_ERROR;
-	}
-#if _WIN32
-	u_long ioctltmp;
-#else
-	int ioctltmp;
-#endif
-	ioctlsocket(fd, FIONBIO, &ioctltmp);
-	if (getAddress(yy->connectAddress, &iaddr) < 0) {
-		/* Warn -- don't exit. */
-		syslog(LOG_ERR, "host %s could not be resolved.\n",
-			yy->bindAddress);
-		closesocket(fd);
-		PARSE_ERROR;
-	}
-	/* Allocate server info */
-	seInfo = (ServerInfo *)
-		realloc(seInfo, sizeof(ServerInfo) * (seTotal + 1));
-	if (!seInfo) {
-		PARSE_ERROR;
-	}
-	ServerInfo *srv = &seInfo[seTotal];
-	memset(srv, 0, sizeof(*srv));
-	srv->fd = fd;
-	srv->localAddr = iaddr;
-	srv->localPort = htons(yy->connectPort);
-	srv->fromHost = yy->bindAddress;
-	if (!srv->fromHost) {
-		PARSE_ERROR;
-	}
-	srv->fromPort = yy->bindPort;
-	srv->toHost = yy->connectAddress;
-	if (!srv->toHost) {
-		PARSE_ERROR;
-	}
-	srv->toPort = yy->connectPort;
-#ifndef _WIN32
-	if (fd > maxfd) {
-		maxfd = fd;
-	}
-#endif
-	++seTotal;
-
-	yy->bindAddress = yy->connectAddress = NULL;
-}
-
-bind_address     =  < ipv4 > { yy->bindAddress = strdup(yytext); }
-connect_address  =  < ipv4 > { yy->connectAddress = strdup(yytext); }
-bind_port        =  port { yy->bindPort = yy->port; }
-connect_port     =  port { yy->connectPort = yy->port; }
-
-port  =  < (number | service) > {
-	struct servent *bindService = getservbyname(yytext, "tcp");
-	yy->port = bindService ? ntohs(bindService->s_port) : atoi(yytext);
-	if (yy->port == 0 || yy->port >= 65536) {
-		syslog(LOG_ERR, "bind port missing or out of range\n");
-		PARSE_ERROR;
-	}
-}
-
-auth  =  auth_key - < pattern > {
-	allRules = (Rule *)
-		realloc(allRules, sizeof(Rule) * (allRulesCount + 1));
-	if (!allRules) {
-		PARSE_ERROR;
-	}
-	allRules[allRulesCount].pattern = strdup(yytext);
-	if (!allRules[allRulesCount].pattern) {
-		PARSE_ERROR;
-	}
-	allRules[allRulesCount].type = yy->isAuthAllow ? allowRule : denyRule;
-	if (seTotal > 0) {
-		if (seInfo[seTotal - 1].rulesStart == 0) {
-			seInfo[seTotal - 1].rulesStart = allRulesCount;
-		}
-		++seInfo[seTotal - 1].rulesCount;
-	} else {
-		++globalRulesCount;
-	}
-	++allRulesCount;
-}
-
-auth_key = < ("allow" | "deny") >         { yy->isAuthAllow = (yytext[0] == 'a'); }
-
-logfile  =  "logfile" - < filename > {
-	logFileName = strdup(yytext);
-	if (!logFileName) {
-		PARSE_ERROR;
-	}
-}
-
-pidlogfile  =  "pidlogfile" - < filename > {
-	pidLogFileName = strdup(yytext);
-	if (!pidLogFileName) {
-		PARSE_ERROR;
-	}
-}
-
-logcommon  =  "logcommon" {
-	logFormatCommon = 1;
-}
-
-invalid_syntax  =  < (!eol .)+ > eol {
-	fprintf(stderr, "rinetd: invalid syntax at line %d: %s\n",
-	        yy->currentLine, yytext);
-	PARSE_ERROR; /* FIXME */
-}
-
-service  =  name
-ipv4     =  number [.] number [.] number [.] number | '0'
-pattern  =  [0-9*?]+ ('.' [0-9*?]+ ('.' [0-9*?]+ ('.' [0-9*?]+)?)?)?
-number   =  digit+
-
-name     =  [a-zA-Z][a-zA-Z0-9_]*
-filename =  '"' [^"]+ '"'
-         | [^ \t\r\n]+
-
--        =  [ \t]+
-digit    =  [0-9]
-sol      =  { ++yy->currentLine; }
-eol      =  '\r'? '\n' | eof
-eof      =  '\0'
-

rinetd.8

@@ -1,199 +1,233 @@
-.\" Copyright (c) 1997, 1998, 1999, Thomas Boutell and Boutell.Com, Inc.
-.\" This software is released for free use under the terms of
-.\" the GNU Public License, version 2 or higher.
-.\"
-.Dd July 19, 2017
-.Dt RINETD 8
-.Os LINUX
-.Sh NAME
-.Nm rinetd
-.Nd internet
-.Dq redirection server
-.Sh SYNOPSIS
-.Nm /usr/sbin/rinetd
-.Sh VERSION
-Version 0.63, 2017/07/19.
-.Sh DESCRIPTION
-.Nm rinetd
-redirects TCP connections from one IP address and port to another. rinetd
-is a single-process server which handles any number of connections to
-the address/port pairs specified in the file /etc/rinetd.conf.
-Since rinetd runs as a single process using nonblocking I/O, it is
-able to redirect a large number of connections without a severe
-impact on the machine. This makes it practical to run TCP services
-on machines inside an IP masquerading firewall. rinetd does not
-redirect FTP, because FTP requires more than one socket.
-.Pp
-rinetd is typically launched at boot time, using the following syntax:
-.Pp
-/usr/sbin/rinetd
-.Pp
-The configuration file is found in the file /etc/rinetd.conf, unless
-another file is specified using the -c command line option.
-.Sh FORWARDING RULES
+.TH rinetd 8 "2021-02-19" "rinetd 0.73"
+
+.SH NAME
+rinetd \- internet redirection server
+
+.SH SYNOPSIS
+\fBrinetd\fR
+[\fB\-f\fR]
+[\fB\-c\fR \fIconfiguration\fR]
+.br
+\fBrinetd \-h\fR
+.br
+\fBrinetd \-v\fR
+
+.SH DESCRIPTION
+.PP
+\fBrinetd\fR
+redirects TCP or UDP connections from one IP address and port to another.
+\fBrinetd\fR is a single-process server which handles any number of connections to
+the address/port pairs specified in the file \fI/etc/rinetd.conf\fR. Since
+\fBrinetd\fR runs as a single process using nonblocking I/O, it is able to redirect a
+large number of connections without a severe impact on the machine. This makes
+it practical to run services on machines inside an IP masquerading firewall.
+.PP
+\fBrinetd\fR is typically launched at boot time, using the following syntax:
+.PP
+\fB    /usr/sbin/rinetd\fR
+.PP
+The configuration file is found in the file \fI/etc/rinetd.conf\fR, unless
+another file is specified using the \fB\-c\fR command line option.
+
+.SH OPTIONS
+.TP
+\fB\-f\fR
+Run \fBrinetd\fR in the foreground, without forking to the background.
+.TP
+\fB\-c\fR \fIconfiguration\fR
+Specify an alternate configuration file.
+.TP
+\fB\-v\fR
+Display the version number and exit.
+.TP
+\fB\-h\fR
+Produce a short help message and exit.
+
+.SH FORWARDING RULES
+.PP
 Most entries in the configuration file are forwarding rules. The
 format of a forwarding rule is as follows:
-.Pp
-bindaddress bindport connectaddress connectport
-.Pp
+.PP
+\fB    bindaddress bindport connectaddress connectport [options...]\fR
+.PP
 For example:
-.Pp
-206.125.69.81 80 10.1.1.2 80
-.Pp
+.PP
+\fB    206.125.69.81 80  10.1.1.2 80\fR
+.PP
 Would redirect all connections to port 80 of the "real" IP address
-206.125.69.81, which could be a virtual interface, through
-rinetd to port 80 of the address 10.1.1.2, which would typically
-be a machine on the inside of a firewall which has no
-direct routing to the outside world.
-.Pp
-Although responding on individual interfaces rather than on all
-interfaces is one of rinetd's primary features, sometimes it is
-preferable to respond on all IP addresses that belong to the server.
-In this situation, the special IP address 0.0.0.0
-can be used. For example:
-.Pp
-0.0.0.0 23 10.1.1.2 23
-.Pp
+206.125.69.81, which could be a virtual interface, through \fBrinetd\fR to port
+80 of the address 10.1.1.2, which would typically be a machine on the inside of
+a firewall which has no direct routing to the outside world.
+
+.PP Although responding on individual interfaces rather than on all interfaces
+is one of \fBrinetd\fR's primary features, sometimes it is preferable to
+respond on all IP addresses that belong to the server. In this situation, the
+special IP address 0.0.0.0 can be used. For example:
+
+.PP
+\fB    0.0.0.0 23  10.1.1.2 23\fR
+.PP
 Would redirect all connections to port 23, for all IP addresses
 assigned to the server. This is the default behavior for most
 other programs.
-.Pp
+.PP
+Ports default to TCP. To specify the protocol, append \fI/udp\fR
+or \fI/tcp\fR to the port number:
+.PP
+\fB    206.125.69.81 80/tcp  10.1.1.2 8000/udp\fR
+.PP
 Service names can be specified instead of port numbers. On most systems,
-service names are defined in the file /etc/services.
-.Pp
+service names are defined in the file \fI/etc/services\fR.
+.PP
 Both IP addresses and hostnames are accepted for
-bindaddress and connectaddress.
-.Pp
-.Sh ALLOW AND DENY RULES
+bindaddress and connectaddress, including IPv6.
+.PP
+
+.SS UDP timeout option
+Since UDP is a connectionless protocol, a timeout is necessary or forwarding
+connections may accumulate with time and exhaust resources. By default, if
+no data is sent or received on a UDP connection for 72 seconds, the other
+connection is closed. This value can be changed using the \fItimeout\fR option:
+.PP
+\fB    0.0.0.0 8000/udp  10.1.1.2 80  [timeout=3600]\fR
+.PP
+This rule will forward all data received on UDP port 8000 to host 10.1.1.2
+on TCP port 80, and will close the connection after no data is received on
+the UDP port for 3600 seconds.
+
+.SS Source address option
+A forwarding rule option allows to bind to a specific local address when
+sending data to the other end. This is done using the \fIsrc\fR option:
+.PP
+\fB    192.168.1.1 80  10.1.1.127 80  [src=10.1.1.2]\fR
+.PP
+Assuming the local host has two IP addresses, 10.1.1.1 and 10.1.1.2, this
+rule ensures that forwarded packets are sent using source address 10.1.1.2.
+
+.SH ALLOW AND DENY RULES
 Configuration files can also contain allow and deny rules.
-.Pp
+.PP
 Allow rules which appear before the first forwarding rule are
 applied globally: if at least one global allow rule exists,
 and the address of a new connection does not
 satisfy at least one of the global allow rules, that connection
 is immediately rejected, regardless of any other rules.
-.Pp
+.PP
 Allow rules which appear after a specific forwarding rule apply
 to that forwarding rule only. If at least one allow rule
 exists for a particular forwarding rule, and the address of a new
 connection does not satisfy at least one of the allow rules
 for that forwarding rule, that connection is immediately
 rejected, regardless of any other rules.
-.Pp
+.PP
 Deny rules which appear before the first forwarding rule are
 applied globally: if the address of a new connection satisfies
 any of the global deny rules, that connection
 is immediately rejected, regardless of any other rules.
-.Pp
+.PP
 Deny rules which appear after a specific forwarding rule apply
 to that forwarding rule only. If the address of a new
 connection satisfies any of the deny rules for that forwarding rule,
 that connection is immediately rejected, regardless of any other rules.
-.Pp
+.PP
 The format of an allow rule is as follows:
-.Pp
-allow pattern
-.Pp
-Patterns can contain the following characters: 0, 1, 2, 3, 4, 5,
-6, 7, 8, 9, . (period), ?, and *. The ? wildcard matches any one
-character. The * wildcard matches any number of characters, including
-zero.
-.Pp
+.PP
+\fB    allow|deny pattern\fR
+.PP
+Patterns can contain the following characters: \fB0\fR, \fB1\fR, \fB2\fR,
+\fB3\fR, \fB4\fR, \fB5\fR, \fB6\fR, \fB7\fR, \fB8\fR, \fB9\fR, \fB.\fR
+(period), \fB?\fR, and \fB*\fR. The \fB?\fR wildcard matches any one character.
+The \fB*\fR wildcard matches any number of characters, including zero.
+.PP
 For example:
-.Pp
-allow 206.125.69.*
-.Pp
+.PP
+\fB    allow 206.125.69.*\fR
+.PP
 This allow rule matches all IP addresses in the 206.125.69 class C domain.
-.Pp
+.PP
 Host names are NOT permitted in allow and deny rules. The performance
 cost of looking up IP addresses to find their corresponding names
-is prohibitive. Since rinetd is a single process server, all other
+is prohibitive. Since \fBrinetd\fR is a single process server, all other
 connections would be forced to pause during the address lookup.
-.Pp
-.Sh LOGGING
-rinetd is able to produce a log file in either of two formats:
-tab-delimited and web server-style "common log format."
-.Pp
-By default, rinetd does not produce a log file. To activate logging, add
+
+.SH LOGGING
+\fBrinetd\fR is able to produce a log file in either of two formats:
+tab-delimited and web server-style "common log format".
+.PP
+By default, \fBrinetd\fR does not produce a log file. To activate logging, add
 the following line to the configuration file:
-.Pp
-logfile log-file-location
-.Pp
-Example: logfile /var/log/rinetd.log
-.Pp
-By default, rinetd logs in a simple tab-delimited format containing
+.PP
+\fB    logfile log-file-location\fR
+.PP
+Example:
+.PP
+\fB    logfile /var/log/rinetd.log\fR
+.PP
+By default, \fBrinetd\fR logs in a simple tab-delimited format containing
 the following information:
-.Pp
-Date and time
-.Pp
-Client address
-.Pp
-Listening host
-.Pp
-Listening port
-.Pp
-Forwarded-to host
-.Pp
-Forwarded-to port
-.Pp
-Bytes received from client
-.Pp
-Bytes sent to client
-.Pp
-Result message
-.Pp
+.PP
+    Date and time
+.PP
+    Client address
+.PP
+    Listening host
+.PP
+    Listening port
+.PP
+    Forwarded-to host
+.PP
+    Forwarded-to port
+.PP
+    Bytes received from client
+.PP
+    Bytes sent to client
+.PP
+    Result message
+.PP
 To activate web server-style "common log format" logging,
 add the following line to the configuration file:
-.Pp
-logcommon
-.Sh COMMAND LINE OPTIONS
-The -c command line option is used to specify an alternate
-configuration file.
-.Pp
-The -f command line option is used to run rinetd in the
-foreground, without forking to the background.
-.Pp
-The -h command line option produces a short help message.
-.Pp
-The -v command line option displays the version number.
-.Sh REINITIALIZING RINETD
-The kill -1 signal (SIGHUP) can be used to cause rinetd
+.PP
+\fB    logcommon\fR
+
+.SH REINITIALIZING RINETD
+.PP
+The \fBkill -1\fR signal (\fISIGHUP\fR) can be used to cause \fBrinetd\fR
 to reload its configuration file without interrupting existing
 connections.
+.PP
 Under Linux\(tm the process id is saved in the file \fI/var/run/rinetd.pid\fR
-to facilitate the kill -HUP. An alternate
-filename can be provided by using the <code>pidlogfile</code>
-configuration file option.
+to facilitate the \fBkill -HUP\fR. An alternate filename can be provided by
+using the pidlogfile configuration file option.
 
-.Sh LIMITATIONS
-rinetd redirects TCP connections only. There is
-no support for UDP. rinetd only redirects protocols which
-use a single TCP socket. This rules out FTP.
-.Sh BUGS
-The server redirected to is not able to identify the host the
-client really came from. This cannot be corrected; however,
-the log produced by rinetd provides a way to obtain this
-information. Under Unix, Sockets would theoretically lose data when closed
-with SO_LINGER turned off, but in Linux this is not the case (kernel
-source comments support this belief on my part). On non-Linux Unix platforms,
-alternate code which uses a different trick to work around blocking close()
-is provided, but this code is untested. The logging is inadequate.
-The duration of each connection should be logged.
-.Sh LICENSE
+.SH BUGS AND LIMITATIONS
+.PP
+\fBrinetd\fR only redirects protocols which use a single TCP or UDP
+socket. This rules out FTP.
+.PP
+The server redirected to is not able to identify the host the client really
+came from. This cannot be corrected; however, the log produced by \fBrinetd\fR
+provides a way to obtain this information. Under Unix, Sockets would
+theoretically lose data when closed with SO_LINGER turned off, but in Linux
+this is not the case (kernel source comments support this belief on my part).
+On non-Linux Unix platforms, alternate code which uses a different trick to
+work around blocking close() is provided, but this code is untested.
+.PP
+The logging is inadequate. The duration of each connection should be logged.
+.SH LICENSE
 Copyright (c) 1997, 1998, 1999, Thomas Boutell and Boutell.Com, Inc.
-.Pp
-Copyright (c) 2003\-2017 Sam Hocevar
-.Pp
+.PP
+Copyright (c) 2003\-2021 Sam Hocevar
+.PP
 This software is released for free use under the terms of
-the GNU Public License, version 2 or higher. NO WARRANTY
+the GNU General Public License, version 2 or higher. NO WARRANTY
 IS EXPRESSED OR IMPLIED. USE THIS SOFTWARE AT YOUR OWN RISK.
-.Sh CONTACT INFORMATION
+.SH CONTACT INFORMATION
 See https://github.com/samhocevar/rinetd/releases for the latest release.
-.Pp
+.PP
 Thomas Boutell can be reached by email: boutell@boutell.com
-.Pp
+.PP
 Sam Hocevar can be reached by email: sam@hocevar.net
-.Sh THANKS
+.SH THANKS
 Thanks are due to Bill Davidsen, Libor Pechachek, Sascha Ziemann, the
 Apache Group, and many others who have contributed advice
 and/or source code to this and other free software projects.

rinetd.conf

@@ -7,6 +7,8 @@
 #
 # allow 192.168.2.*
 # deny 192.168.2.1?
+# allow fe80:*
+# deny 2001:618:*:e43f
 
 
 #
@@ -15,9 +17,13 @@
 # you may specify allow and deny rules after a specific forwarding rule
 # to apply to only that forwarding rule
 #
-# bindadress    bindport  connectaddress  connectport
-127.0.0.1 4000    127.0.0.1 22
-#127.0.0.1 4000/udp    127.0.0.1 22
+# bindadress  bindport  connectaddress  connectport  options...
+# 0.0.0.0     80        192.168.1.2     80
+# ::1         80        192.168.1.2     80
+# 0.0.0.0     80        fe80::1         80
+# 127.0.0.1   4000      127.0.0.1       3000
+# 127.0.0.1   4000/udp  127.0.0.1       22           [timeout=1200]
+# 127.0.0.1   8000/udp  192.168.1.2     8000/udp     [src=192.168.1.2,timeout=1200]
 
 # logging information
 logfile /var/log/rinetd.log

rinetd.h

@@ -1,69 +0,0 @@
-/* Constants */
-
-static int const RINETD_BUFFER_SIZE = 16384;
-static int const RINETD_LISTEN_BACKLOG = 128;
-
-#define RINETD_CONFIG_FILE "/etc/rinetd.conf"
-#define RINETD_PID_FILE "/var/run/rinetd.pid"
-
-/* Program state */
-
-enum ruleType {
-	allowRule,
-	denyRule,
-};
-
-typedef struct _rule Rule;
-struct _rule
-{
-	char *pattern;
-	int type;
-};
-
-typedef struct _server_info ServerInfo;
-struct _server_info {
-	SOCKET fd;
-
-	/* In network order, for network purposes */
-	struct in_addr localAddr;
-	unsigned short localPort;
-
-	/* In ASCII and local byte order, for logging purposes */
-	char *fromHost, *toHost;
-	int fromPort, toPort;
-
-	/* Offset and count into list of allow and deny rules. Any rules
-		prior to globalAllowRules and globalDenyRules are global rules. */
-	int rulesStart, rulesCount;
-};
-
-typedef struct _socket Socket;
-struct _socket
-{
-	SOCKET fd;
-	/* recv: received on this socket
-		sent: sent to this socket from the other buffer */
-	int recvPos, sentPos;
-	int recvBytes, sentBytes;
-	char *buffer;
-};
-
-typedef struct _connection_info ConnectionInfo;
-struct _connection_info
-{
-	Socket remote, local;
-	struct in_addr reAddresses;
-	int coClosing;
-	int coLog;
-	ServerInfo const *server; // only useful for logEvent
-};
-
-/* Option parsing */
-
-typedef struct _rinetd_options RinetdOptions;
-struct _rinetd_options
-{
-	char const *conf_file;
-	int foreground;
-};
-

rinetd.vcxproj

@@ -0,0 +1,110 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="src\getopt.c" />
+    <ClCompile Include="src\match.c" />
+    <ClCompile Include="src\net.c" />
+    <ClCompile Include="src\parse.c" />
+    <ClCompile Include="src\rinetd.c" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="src\getopt.h" />
+    <ClInclude Include="src\match.h" />
+    <ClInclude Include="src\net.h" />
+    <ClInclude Include="src\parse.h" />
+    <ClInclude Include="src\rinetd.h" />
+    <ClInclude Include="src\types.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="src\parse.peg" />
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <VCProjectVersion>15.0</VCProjectVersion>
+    <ProjectGuid>{3F1D9D58-3205-48E9-9C93-557291A45D74}</ProjectGuid>
+    <Keyword>Win32Proj</Keyword>
+    <RootNamespace>rinetd</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <PlatformToolset>v142</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)'=='Debug'" Label="Configuration">
+    <UseDebugLibraries>true</UseDebugLibraries>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)'=='Release'" Label="Configuration">
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="Shared">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup Condition="'$(Configuration)'=='Debug'">
+    <LinkIncremental>true</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)'=='Release'">
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <SDLCheck>true</SDLCheck>
+      <CompileAs>CompileAsC</CompileAs>
+      <ConformanceMode>true</ConformanceMode>
+      <PreprocessorDefinitions>_CONSOLE;PACKAGE_VERSION="0.73";_CRT_SECURE_NO_WARNINGS;_CRT_NONSTDC_NO_DEPRECATE;_WINSOCK_DEPRECATED_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <AdditionalDependencies>ws2_32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)'=='Debug'">
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)'=='Release'">
+    <ClCompile>
+      <Optimization>MaxSpeed</Optimization>
+      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+    </ClCompile>
+    <Link>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+  </ItemDefinitionGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>

src/Makefile.am

@@ -0,0 +1,24 @@
+
+EXTRA_DIST = parse.peg getopt.c getopt.h
+
+sbin_PROGRAMS = ../rinetd
+___rinetd_SOURCES = rinetd.c rinetd.h \
+                    parse.c parse.h \
+                    match.c match.h \
+                    net.c net.h \
+                    types.h
+
+BUILT_SOURCES = parse.c
+
+# If peg/leg is available, regenerate parse.h
+parse.c: parse.peg
+	if which leg >/dev/null 2>&1; then leg -o $@ $^; else touch $@; fi
+
+# _POSIX_C_SOURCE is for SA_RESTART and others
+# _DARWIN_C_SOURCE is for NI_MAXHOST on OS X
+# _XOPEN_SOURCE is for struct sigaction
+# _GNU_SOURCE is for h_errno and gethostbyname-related macros
+___rinetd_CFLAGS = -std=c99 -D_POSIX_C_SOURCE=200809L \
+                   -D_XOPEN_SOURCE -D_GNU_SOURCE -D_DARWIN_C_SOURCE \
+                   -Wall -Wextra -Wwrite-strings
+

src/match.c

@@ -1,5 +1,13 @@
+/* Copyright © 1997—1999 Thomas Boutell <boutell@boutell.com>
+                         and Boutell.Com, Inc.
+             © 2003—2017 Sam Hocevar <sam@hocevar.net>
+
+   This software is released for free use under the terms of
+   the GNU Public License, version 2 or higher. NO WARRANTY
+   IS EXPRESSED OR IMPLIED. USE THIS SOFTWARE AT YOUR OWN RISK. */
+
 #if HAVE_CONFIG_H
-#include <config.h>
+   #include <config.h>
 #endif
 
 #include <string.h>

src/match.h

@@ -0,0 +1,14 @@
+/* Copyright © 1997—1999 Thomas Boutell <boutell@boutell.com>
+                         and Boutell.Com, Inc.
+             © 2003—2017 Sam Hocevar <sam@hocevar.net>
+
+   This software is released for free use under the terms of
+   the GNU Public License, version 2 or higher. NO WARRANTY
+   IS EXPRESSED OR IMPLIED. USE THIS SOFTWARE AT YOUR OWN RISK. */
+
+#pragma once
+
+extern int match(char const *s, char const *p);
+extern int matchNoCase(char const *s, char const *p);
+extern int matchBody(char const *s, char const *p, int nocase);
+

src/net.c

@@ -0,0 +1,85 @@
+/* Copyright © 1997—1999 Thomas Boutell <boutell@boutell.com>
+                         and Boutell.Com, Inc.
+             © 2003—2021 Sam Hocevar <sam@hocevar.net>
+
+   This software is released for free use under the terms of
+   the GNU Public License, version 2 or higher. NO WARRANTY
+   IS EXPRESSED OR IMPLIED. USE THIS SOFTWARE AT YOUR OWN RISK. */
+
+#if HAVE_CONFIG_H
+#	include <config.h>
+#endif
+
+#include <stdio.h>
+#include "net.h"
+
+void setSocketDefaults(SOCKET fd) {
+	/* Make socket non-blocking (FIXME: this uses legacy API) */
+	FIONBIO_ARG_T ioctltmp = 1;
+#if _WIN32
+	ioctlsocket(fd, FIONBIO, &ioctltmp);
+#else
+	ioctl(fd, FIONBIO, &ioctltmp);
+#endif
+
+#if defined __linux__
+	int tmp = 0;
+	setsockopt(fd, SOL_SOCKET, SO_LINGER, &tmp, sizeof(tmp));
+#endif
+
+#if !defined __linux__ && !defined _WIN32
+	int tmp = 1024;
+	setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp));
+#endif
+}
+
+int getAddrInfoWithProto(char *address, char *port, int protocol, struct addrinfo **ai)
+{
+	struct addrinfo hints = {
+		.ai_family = AF_UNSPEC,
+		.ai_protocol = protocol,
+		.ai_socktype = protocol == IPPROTO_UDP ? SOCK_DGRAM : SOCK_STREAM,
+		.ai_flags = AI_PASSIVE,
+	};
+
+	int ret = getaddrinfo(address, port, &hints, ai);
+	if (ret != 0) {
+		fprintf(stderr, "rinetd: cannot resolve host \"%s\" port %s "
+				"(getaddrinfo() error: %s)\n",
+			address, port ? port : "<null>", gai_strerror(ret));
+	}
+
+	return ret;
+}
+
+int sameSocketAddress(struct sockaddr_storage *a, struct sockaddr_storage *b) {
+	if (a->ss_family != b->ss_family)
+		return 0;
+
+	switch (a->ss_family) {
+		case AF_INET: {
+			struct sockaddr_in *a4 = (struct sockaddr_in *)a;
+			struct sockaddr_in *b4 = (struct sockaddr_in *)b;
+			return a4->sin_port == b4->sin_port
+				&& a4->sin_addr.s_addr == b4->sin_addr.s_addr;
+		}
+		case AF_INET6: {
+			struct sockaddr_in6 *a6 = (struct sockaddr_in6 *)a;
+			struct sockaddr_in6 *b6 = (struct sockaddr_in6 *)b;
+			return a6->sin6_port == b6->sin6_port
+				&& a6->sin6_addr.s6_addr == b6->sin6_addr.s6_addr;
+		}
+	}
+	return 0;
+}
+
+uint16_t getPort(struct addrinfo* ai) {
+	switch (ai->ai_family) {
+		case AF_INET:
+			return ntohs(((struct sockaddr_in*)ai->ai_addr)->sin_port);
+		case AF_INET6:
+			return ntohs(((struct sockaddr_in6*)ai->ai_addr)->sin6_port);
+		default:
+			return 0;
+	}
+}

src/net.h

@@ -0,0 +1,90 @@
+/* Copyright © 1997—1999 Thomas Boutell <boutell@boutell.com>
+                         and Boutell.Com, Inc.
+             © 2003—2021 Sam Hocevar <sam@hocevar.net>
+
+   This software is released for free use under the terms of
+   the GNU Public License, version 2 or higher. NO WARRANTY
+   IS EXPRESSED OR IMPLIED. USE THIS SOFTWARE AT YOUR OWN RISK. */
+
+#pragma once
+
+#if _WIN32
+	/* Define this to a reasonably large value */
+#	define FD_SETSIZE 4096
+#	include <winsock2.h>
+#	include <ws2ipdef.h>
+#	include <ws2tcpip.h>
+#	include <windows.h>
+#else
+#	include <sys/types.h>
+#	include <sys/socket.h>
+#	include <sys/ioctl.h>
+#	include <netdb.h>
+#	include <netinet/in.h>
+#	include <arpa/inet.h>
+#endif
+
+#include <stdint.h>
+
+#if defined HAVE_ERRNO_H
+#	include <errno.h>
+#endif
+
+#if defined HAVE_UNISTD_H
+#	include <unistd.h>
+#endif
+
+/* We've got to get FIONBIO from somewhere. Try the Solaris location
+	if it isn't defined yet by the above includes. */
+#ifndef FIONBIO
+#	include <sys/filio.h>
+#endif /* FIONBIO */
+
+#if HAVE_SSIZE_T
+#	define SSIZE_T ssize_t
+#else
+#	define SSIZE_T int
+#endif
+
+#if HAVE_SOCKLEN_T
+#	define SOCKLEN_T socklen_t
+#else
+#	define SOCKLEN_T int
+#endif
+
+#if _WIN32
+#	define FIONBIO_ARG_T u_long
+#else
+#	define FIONBIO_ARG_T int
+#endif
+
+#if _WIN32
+	/* _WIN32 doesn't really have WSAEAGAIN */
+#	ifndef WSAEAGAIN
+#		define WSAEAGAIN WSAEWOULDBLOCK
+#	endif
+#	ifdef gai_strerror
+#		undef gai_strerror
+#		define gai_strerror gai_strerrorA
+#	endif
+#else
+	/* Windows sockets compatibility defines */
+#	define INVALID_SOCKET (-1)
+#	define SOCKET_ERROR (-1)
+static inline int closesocket(int s) {
+	return close(s);
+}
+#	define WSAEWOULDBLOCK EWOULDBLOCK
+#	define WSAEAGAIN EAGAIN
+#	define WSAEINPROGRESS EINPROGRESS
+#	define WSAEINTR EINTR
+#	define SOCKET int
+static inline int GetLastError(void) {
+	return errno;
+}
+#endif /* _WIN32 */
+
+void setSocketDefaults(SOCKET fd);
+int sameSocketAddress(struct sockaddr_storage *a, struct sockaddr_storage *b);
+int getAddrInfoWithProto(char *address, char *port, int protocol, struct addrinfo **ai);
+uint16_t getPort(struct addrinfo* ai);

src/parse.h

@@ -0,0 +1,12 @@
+/* Copyright © 1997—1999 Thomas Boutell <boutell@boutell.com>
+                         and Boutell.Com, Inc.
+             © 2003—2017 Sam Hocevar <sam@hocevar.net>
+
+   This software is released for free use under the terms of
+   the GNU Public License, version 2 or higher. NO WARRANTY
+   IS EXPRESSED OR IMPLIED. USE THIS SOFTWARE AT YOUR OWN RISK. */
+
+#pragma once
+
+void parseConfiguration(char const *in);
+

src/parse.peg

@@ -0,0 +1,189 @@
+#  Copyright © 1997—1999 Thomas Boutell <boutell@boutell.com>
+#                        and Boutell.Com, Inc.
+#            © 2003—2021 Sam Hocevar <sam@hocevar.net>
+#
+#  This software is released for free use under the terms of
+#  the GNU Public License, version 2 or higher. NO WARRANTY
+#  IS EXPRESSED OR IMPLIED. USE THIS SOFTWARE AT YOUR OWN RISK. */
+
+%{
+#if HAVE_CONFIG_H
+#	include <config.h>
+#endif
+
+#include "net.h"
+#include "types.h"
+#include "rinetd.h"
+#include "parse.h"
+
+#define YY_CTX_LOCAL 1
+#define YY_CTX_MEMBERS \
+	FILE *fp; \
+	int currentLine; \
+	int isAuthAllow; \
+	char *tmpPort, *bindPort, *connectPort; \
+	int tmpProto, bindProto, connectProto; \
+	int serverTimeout; \
+	char *bindAddress, *connectAddress, *sourceAddress;
+#define YY_INPUT(yyctx, buf, result, max_size) \
+{ \
+	int yyc = fgetc(yyctx->fp); \
+	result = (EOF == yyc) ? 0 : (*(buf) = yyc, 1); \
+}
+#define PARSE_ERROR exit(1);
+#define MEMORY_ERROR { \
+		logError("could not allocate memory when parsing configuration.\n"); \
+		exit(1); \
+	}
+
+#if defined __clang__
+#pragma clang diagnostic ignored "-Wunused-parameter"
+#pragma clang diagnostic ignored "-Wunused-label"
+#elif defined __GNUC__
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#pragma GCC diagnostic ignored "-Wunused-label"
+#endif
+
+%}
+
+file     =  (sol (line eol | invalid-syntax))*
+line     =  -? (command -?)? comment?
+command  =  (server-rule | auth-rule | logfile | pidlogfile | logcommon)
+comment  =  "#" (!eol .)*
+
+server-rule  =  bind-address - bind-port - connect-address - connect-port (-? server-options)?
+{
+	addServer(yy->bindAddress, yy->bindPort, yy->bindProto,
+		yy->connectAddress, yy->connectPort, yy->connectProto,
+		yy->serverTimeout > 0 ? yy->serverTimeout : RINETD_DEFAULT_UDP_TIMEOUT,
+		yy->sourceAddress);
+	free(yy->bindAddress);
+	free(yy->connectAddress);
+	free(yy->sourceAddress);
+	yy->bindAddress = yy->connectAddress = yy->sourceAddress = NULL;
+	free(yy->bindPort);
+	free(yy->connectPort);
+	yy->bindPort = yy->connectPort = NULL;
+	yy->serverTimeout = 0;
+}
+
+bind-address     =  < address > { yy->bindAddress = strdup(yytext); }
+connect-address  =  < address > { yy->connectAddress = strdup(yytext); }
+bind-port        =  full-port { yy->bindPort = yy->tmpPort; yy->bindProto = yy->tmpProto; }
+connect-port     =  full-port { yy->connectPort = yy->tmpPort; yy->connectProto = yy->tmpProto; }
+server-options   =  "[" -? option-list -? "]"
+
+option-list     =  option (-? ',' -? option-list)?
+option          =  (option-timeout | option-source)
+option-timeout  =  "timeout" -? "=" -? < number >    { yy->serverTimeout = atoi(yytext); }
+option-source   =  "src"     -? "=" -? < address >   { yy->sourceAddress = strdup(yytext); }
+
+full-port  =  port proto
+
+port   = < (number | service) >   { yy->tmpPort = strdup(yytext); }
+proto  = '/tcp'                   { yy->tmpProto = IPPROTO_TCP; }
+       | '/udp'                   { yy->tmpProto = IPPROTO_UDP; }
+       | ''                       { yy->tmpProto = IPPROTO_TCP; }
+
+auth-rule  =  auth-key - < pattern >
+{
+	allRules = (Rule *)
+		realloc(allRules, sizeof(Rule) * (allRulesCount + 1));
+	if (!allRules) {
+		MEMORY_ERROR;
+	}
+	allRules[allRulesCount].pattern = strdup(yytext);
+	if (!allRules[allRulesCount].pattern) {
+		MEMORY_ERROR;
+	}
+	allRules[allRulesCount].type = yy->isAuthAllow ? allowRule : denyRule;
+	if (seTotal > 0) {
+		if (seInfo[seTotal - 1].rulesStart == 0 && seInfo[seTotal - 1].rulesCount == 0) {
+			seInfo[seTotal - 1].rulesStart = allRulesCount;
+		}
+		++seInfo[seTotal - 1].rulesCount;
+	} else {
+		++globalRulesCount;
+	}
+	++allRulesCount;
+}
+
+auth-key = < ("allow" | "deny") >         { yy->isAuthAllow = (yytext[0] == 'a'); }
+
+logfile  =  "logfile" - < filename >
+{
+	logFileName = strdup(yytext);
+	if (!logFileName) {
+		MEMORY_ERROR;
+	}
+}
+
+pidlogfile  =  "pidlogfile" - < filename >
+{
+	pidLogFileName = strdup(yytext);
+	if (!pidLogFileName) {
+		MEMORY_ERROR;
+	}
+}
+
+logcommon  =  "logcommon"
+{
+	logFormatCommon = 1;
+}
+
+invalid_syntax  =  < (!eol .)+ > eol
+{
+	logError("invalid syntax at line %d: %s\n",
+	        yy->currentLine, yytext);
+	PARSE_ERROR; /* FIXME */
+}
+
+service  =  name
+address  =  ipv4 | ipv6 | hostname
+pattern  =  (hexdigit | '[' | ']' | ':' | '.' | [*?] )+
+number   =  digit+
+
+ipv4      =  number '.' number '.' number '.' number | '0'
+ipv6      = '[' bare_ipv6 ']' | bare_ipv6
+bare_ipv6 =  hexdigit* ':' (hexdigit | ':')* # Must have at least one ':'
+hostname  =  (label '.')* name '.'?
+
+
+name     =  id ('-' | id | digit)*
+label    =  (id | digit) ('-' | id | digit)* # DNS labels may have digits
+filename =  '"' [^"]+ '"'
+         |  [^ \t\r\n]+
+
+-        =  [ \t]+
+digit    =  [0-9]
+hexdigit =  [0-9a-fA-F]
+id       =  [a-zA-Z_]
+sol      =  { ++yy->currentLine; }
+eol      =  '\r'? '\n' | eof
+eof      =  '\0'
+
+%%
+
+void parseConfiguration(char const *file)
+{
+	FILE *in = fopen(file, "r");
+	if (!in) {
+		logError("could not open configuration file %s.\n", file);
+		exit(1);
+	}
+
+	yycontext ctx;
+	memset(&ctx, 0, sizeof(yycontext));
+	ctx.fp = in;
+	if (!yyparse(&ctx)) {
+		logError("invalid syntax in file %s, line %d.\n", file, -1);
+		exit(1);
+	}
+	yyrelease(&ctx);
+
+	fclose(in);
+
+	/* Avoid warnings for these unused functions */
+	(void)yySet; (void)yyPush; (void)yyPop; (void)yyAccept;
+}
+

src/rinetd.h

@@ -0,0 +1,42 @@
+/* Copyright © 1997—1999 Thomas Boutell <boutell@boutell.com>
+                         and Boutell.Com, Inc.
+             © 2003—2021 Sam Hocevar <sam@hocevar.net>
+
+   This software is released for free use under the terms of
+   the GNU Public License, version 2 or higher. NO WARRANTY
+   IS EXPRESSED OR IMPLIED. USE THIS SOFTWARE AT YOUR OWN RISK. */
+
+#pragma once
+
+#include <stdint.h>
+
+/* Constants */
+
+static int const RINETD_BUFFER_SIZE = 16384;
+static int const RINETD_LISTEN_BACKLOG = 128;
+static int const RINETD_DEFAULT_UDP_TIMEOUT = 72;
+
+#define RINETD_CONFIG_FILE "/etc/rinetd.conf"
+#define RINETD_PID_FILE "/var/run/rinetd.pid"
+
+/* Global configuration */
+
+extern Rule *allRules;
+extern int allRulesCount;
+extern int globalRulesCount;
+
+extern ServerInfo *seInfo;
+extern int seTotal;
+
+extern char *logFileName;
+extern char *pidLogFileName;
+extern int logFormatCommon;
+extern FILE *logFile;
+
+/* Functions */
+
+void logError(char const *fmt, ...);
+void logInfo(char const *fmt, ...);
+void addServer(char *bindAddress, char *bindPort, int bindProtocol,
+               char *connectAddress, char *connectPort, int connectProtocol,
+               int serverTimeout, char *sourceAddress);

src/types.h

@@ -0,0 +1,76 @@
+/* Copyright © 1997—1999 Thomas Boutell <boutell@boutell.com>
+                         and Boutell.Com, Inc.
+             © 2003—2021 Sam Hocevar <sam@hocevar.net>
+
+   This software is released for free use under the terms of
+   the GNU Public License, version 2 or higher. NO WARRANTY
+   IS EXPRESSED OR IMPLIED. USE THIS SOFTWARE AT YOUR OWN RISK. */
+
+#pragma once
+
+#include <time.h>
+#include <stdint.h>
+
+typedef enum _rule_type ruleType;
+enum _rule_type {
+	allowRule,
+	denyRule,
+};
+
+typedef struct _rule Rule;
+struct _rule
+{
+	char *pattern;
+	ruleType type;
+};
+
+typedef struct _server_info ServerInfo;
+struct _server_info {
+	SOCKET fd;
+
+	/* In network order, for network purposes */
+	struct addrinfo *fromAddrInfo, *toAddrInfo, *sourceAddrInfo;
+
+	/* In ASCII, for logging purposes */
+	char *fromHost, *toHost;
+
+	/* Offset and count into list of allow and deny rules. Any rules
+		prior to globalAllowRules and globalDenyRules are global rules. */
+	int rulesStart, rulesCount;
+	/* Timeout for UDP traffic before we consider the connection
+		was dropped by the remote host. */
+	int serverTimeout;
+};
+
+typedef struct _socket Socket;
+struct _socket
+{
+	SOCKET fd;
+	int family, protocol;
+	/* recv: received on this socket
+		sent: sent through this socket from the other buffer */
+	int recvPos, sentPos;
+	uint64_t totalBytesIn, totalBytesOut;
+	char *buffer;
+};
+
+typedef struct _connection_info ConnectionInfo;
+struct _connection_info
+{
+	Socket remote, local;
+	struct sockaddr_storage remoteAddress;
+	time_t remoteTimeout;
+	int coClosing;
+	int coLog;
+	ServerInfo const *server; // only useful for logEvent
+};
+
+/* Option parsing */
+
+typedef struct _rinetd_options RinetdOptions;
+struct _rinetd_options
+{
+	char const *conf_file;
+	int foreground;
+};
+