diff --git a/configure.ac b/configure.ac index 242934c6..f3705fa3 100644 --- a/configure.ac +++ b/configure.ac @@ -55,6 +55,7 @@ AC_ARG_ENABLE(quiet, # Check for extra plugins to enable AC_PLUGIN([alsa-utils], [no], [Save and restore ALSA sound settings using alsactl]) AC_PLUGIN([dbus], [no], [Setup and start system message bus, D-Bus]) +AC_PLUGIN([inetd-echo], [no], [Inetd plugin: echo server, RFC862]) AC_PLUGIN([lost], [no], [Example HOOK_SVC_LOST plugin, very noisy as-is!]) AC_PLUGIN([resolvconf], [no], [Setup necessary files for resolvconf]) AC_PLUGIN([x11-common], [no], [Console setup (for X)]) diff --git a/plugins/Makefile.am b/plugins/Makefile.am index d2233f84..35038251 100644 --- a/plugins/Makefile.am +++ b/plugins/Makefile.am @@ -16,6 +16,10 @@ if BUILD_DBUS_PLUGIN libplug_la_SOURCES += dbus.c endif +if BUILD_INETD_ECHO_PLUGIN +libplug_la_SOURCES += echo.c +endif + if BUILD_LOST_PLUGIN libplug_la_SOURCES += lost.c endif @@ -36,6 +40,10 @@ if BUILD_DBUS_PLUGIN pkglib_LTLIBRARIES += dbus.la endif +if BUILD_INETD_ECHO_PLUGIN +pkglib_LTLIBRARIES += echo.la +endif + if BUILD_LOST_PLUGIN pkglib_LTLIBRARIES += lost.la endif diff --git a/plugins/echo.c b/plugins/echo.c new file mode 100644 index 00000000..6cad05a5 --- /dev/null +++ b/plugins/echo.c @@ -0,0 +1,67 @@ +/* Optional inetd plugin for the echo protocol RFC 862 + * + * Copyright (c) 2016 Joachim Nilsson + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include +#include /* STDIN_FILENO */ +#include + +#include "../plugin.h" + +static int echo_cb(int type) +{ + int sd = STDIN_FILENO; + char buf[BUFSIZ]; + ssize_t len; + struct sockaddr_storage sa; + socklen_t sa_len = sizeof(sa); + + len = recvfrom(sd, buf, sizeof(buf), MSG_DONTWAIT, (struct sockaddr *)&sa, &sa_len); + if (-1 == len) + return -1; /* On error, close connection. */ + + return sendto(sd, buf, len, MSG_DONTWAIT, (struct sockaddr *)&sa, sa_len); +} + +static plugin_t plugin = { + .name = "echo", /* Must match the inetd /etc/services entry */ + .inetd = { + .cmd = echo_cb + }, +}; + +PLUGIN_INIT(plugin_init) +{ + plugin_register(&plugin); +} + +PLUGIN_EXIT(plugin_exit) +{ + plugin_unregister(&plugin); +} + +/** + * Local Variables: + * indent-tabs-mode: t + * c-file-style: "linux" + * End: + */