diff --git a/README.md b/README.md index 4231887e..b70b13f4 100644 --- a/README.md +++ b/README.md @@ -75,6 +75,7 @@ Built-in optional inetd services: - echo RFC862 - chargen RFC864 +- daytime RFC867 - discard RFC863 - time (rdate) RFC868 @@ -487,6 +488,7 @@ network testing/availability, as well as a rudimentary time server for - echo - chargen +- daytime - discard - time @@ -499,6 +501,8 @@ the `finit.conf` or `finit.d/*.conf` like this: inetd echo/tcp nowait [2345] internal inetd chargen/udp wait [2345] internal inetd chargen/tcp nowait [2345] internal + inetd daytime/udp wait [2345] internal + inetd daytime/tcp nowait [2345] internal inetd discard/udp wait [2345] internal inetd discard/tcp nowait [2345] internal inetd time/udp wait [2345] internal @@ -577,6 +581,8 @@ For your convenience a set of *optional* plugins are available: * *chargen.so*: RFC 864 plugin. Start as inetd service, like time below. +* *daytime.so*: RFC 867 plugin. Start as inetd service, like time below. + * *discard.so*: RFC 863 plugin. Start as inetd service, like time below. * *hwclock.so*: Restore and save system clock from/to RTC on diff --git a/configure.ac b/configure.ac index 2e1f4081..772af2f3 100644 --- a/configure.ac +++ b/configure.ac @@ -57,7 +57,8 @@ AC_PLUGIN([alsa-utils], [no], [Save and restore ALSA sound settings using al AC_PLUGIN([dbus], [no], [Setup and start system message bus, D-Bus]) AC_PLUGIN([inetd-echo], [no], [Inetd plugin: echo server, RFC862]) AC_PLUGIN([inetd-chargen], [no], [Inetd plugin: character generator, RFC864]) -AC_PLUGIN([inetd-discard], [no], [Inetd plugin: discard server, RFC862]) +AC_PLUGIN([inetd-daytime], [no], [Inetd plugin: daytime server, RFC867]) +AC_PLUGIN([inetd-discard], [no], [Inetd plugin: discard server, RFC863]) AC_PLUGIN([inetd-time], [no], [Inetd plugin: time (rdate) server, RFC868]) AC_PLUGIN([lost], [no], [Example HOOK_SVC_LOST plugin, very noisy as-is!]) AC_PLUGIN([resolvconf], [no], [Setup necessary files for resolvconf]) diff --git a/plugins/Makefile.am b/plugins/Makefile.am index 49d6a5c4..80533802 100644 --- a/plugins/Makefile.am +++ b/plugins/Makefile.am @@ -23,6 +23,10 @@ if BUILD_INETD_CHARGEN_PLUGIN libplug_la_SOURCES += chargen.c endif +if BUILD_INETD_DAYTIME_PLUGIN +libplug_la_SOURCES += daytime.c +endif + if BUILD_INETD_DISCARD_PLUGIN libplug_la_SOURCES += discard.c endif @@ -62,6 +66,10 @@ if BUILD_INETD_CHARGEN_PLUGIN pkglib_LTLIBRARIES += chargen.la endif +if BUILD_INETD_DAYTIME_PLUGIN +pkglib_LTLIBRARIES += daytime.la +endif + if BUILD_INETD_DISCARD_PLUGIN pkglib_LTLIBRARIES += discard.la endif diff --git a/plugins/daytime.c b/plugins/daytime.c new file mode 100644 index 00000000..64264176 --- /dev/null +++ b/plugins/daytime.c @@ -0,0 +1,96 @@ +/* Optional inetd plugin for Daytime Protocol, RFC 867 + * + * 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 +#include /* STDIN_FILENO */ +#include + +#include "../plugin.h" + +static char *daytime(char *buf, size_t len) +{ + time_t t; + struct tm *tmp; + + t = time(NULL); + tmp = localtime(&t); + + memset(buf, 0, len); + strftime(buf, len, "%a, %B %d, %Y %T-%Z", tmp); + + return buf; +} + +static int recv_peer(int sd, char *buf, ssize_t len, struct sockaddr *sa, socklen_t *sa_len) +{ + len = recvfrom(sd, buf, sizeof(buf), MSG_DONTWAIT, sa, sa_len); + if (-1 == len) + return -1; /* On error, close connection. */ + + return 0; +} + +static int send_peer(int sd, char *buf, ssize_t len, struct sockaddr *sa, socklen_t sa_len) +{ + char *now = daytime(buf, len); + + return sendto(sd, now, strlen(now), MSG_DONTWAIT, sa, sa_len); +} + +static int cb(int type) +{ + int sd = STDIN_FILENO; + char buf[BUFSIZ]; + struct sockaddr_storage sa; + socklen_t sa_len = sizeof(sa); + + if (recv_peer(sd, buf, sizeof(buf), (struct sockaddr *)&sa, &sa_len)) + return -1; + + return send_peer(sd, buf, sizeof(buf), (struct sockaddr *)&sa, sa_len); +} + +static plugin_t plugin = { + .name = "daytime", /* Must match the inetd /etc/services entry */ + .inetd = { + .cmd = 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: + */