From aa8afceb8403ba5af7f9db96cdd2d9766961ab09 Mon Sep 17 00:00:00 2001 From: Lucas Date: Fri, 4 Sep 2020 02:03:44 +0000 Subject: [PATCH] Initial import --- COPYING | 113 +++++++++++++++++++++++++++++++++++++++++++++++++++++ Makefile | 40 +++++++++++++++++++ README | 10 +++++ discardd.c | 59 ++++++++++++++++++++++++++++ 4 files changed, 222 insertions(+) create mode 100644 COPYING create mode 100644 Makefile create mode 100644 README create mode 100644 discardd.c diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..c7a74f9 --- /dev/null +++ b/COPYING @@ -0,0 +1,113 @@ +CC0 1.0 Universal + +Statement of Purpose + +The laws of most jurisdictions throughout the world automatically confer +exclusive Copyright and Related Rights (defined below) upon the creator and +subsequent owner(s) (each and all, an "owner") of an original work of +authorship and/or a database (each, a "Work"). + +Certain owners wish to permanently relinquish those rights to a Work for the +purpose of contributing to a commons of creative, cultural and scientific +works ("Commons") that the public can reliably and without fear of later +claims of infringement build upon, modify, incorporate in other works, reuse +and redistribute as freely as possible in any form whatsoever and for any +purposes, including without limitation commercial purposes. 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Affirmer understands and acknowledges that Creative Commons is not a + party to this document and has no duty or obligation with respect to this + CC0 or use of the Work. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..4e46ac9 --- /dev/null +++ b/Makefile @@ -0,0 +1,40 @@ +# discardd +# Written in 2020 by Lucas +# CC0 1.0 Universal/Public domain - No rights reserved +# +# To the extent possible under law, the author(s) have dedicated all +# copyright and related and neighboring rights to this software to the +# public domain worldwide. This software is distributed without any +# warranty. You should have received a copy of the CC0 Public Domain +# Dedication along with this software. If not, see +# . +.POSIX: +.SUFFIXES: .c + +P = discardd +V = 0.0 + +PREFIX = /usr/local + +BIN = discardd +SRC = ${BIN:=.c} +FILES = COPYING Makefile README ${SRC} + +.c: + ${CC} ${CFLAGS} ${LDFLAGS} ${INCS} -o $@ $< ${LIBS} + +all: ${BIN} + +clean: + rm -f ${BIN} ${P}-${V}.tgz + +dist: clean + pax -ws ,^,${P}-${V}/, ${FILES} | gzip >${P}-${V}.tgz + +install: all + mkdir -p ${PREFIX}/bin + cp -f ${BIN} ${PREFIX}/bin + cd ${PREFIX}/bin && chmod 555 ${BIN} + +uninstall: + cd ${PREFIX}/bin && rm -f ${BIN} diff --git a/README b/README new file mode 100644 index 0000000..11f8e85 --- /dev/null +++ b/README @@ -0,0 +1,10 @@ +discardd +======== + +This is a C implementation of the Discard Protocol, described in RFC +863. The point of it is to kill boredness, get back to play a bit with +network programming in C and to tackle how to use `poll(2)` to handle +concurrent clients. + +`discardd` will listen on port 9999 if it's run as a normal user, and +on port 9, reserved by IANA for it, if it's run as root. diff --git a/discardd.c b/discardd.c new file mode 100644 index 0000000..3297c92 --- /dev/null +++ b/discardd.c @@ -0,0 +1,59 @@ +/* + * discard + * Written in 2020 by Lucas + * CC0 1.0 Universal/Public domain - No rights reserved + * + * To the extent possible under law, the author(s) have dedicated all + * copyright and related and neighboring rights to this software to the + * public domain worldwide. This software is distributed without any + * warranty. You should have received a copy of the CC0 Public Domain + * Dedication along with this software. If not, see + * . + */ + +#include +#include +#include +#include + +static void +usage(void) +{ + fprintf(stderr, "Usage: %s -t | -u\n", getprogname()); + exit(1); +} + +int +main(int argc, char *argv[]) +{ + int ch, do_tcp, do_udp; + + do_tcp = do_udp = 0; + while ((ch = getopt(argc, argv, "tu")) != -1) { + switch (ch) { + case 't': + do_tcp = 1; + break; + case 'u': + do_udp = 1; + break; + default: + usage(); + } + } + argc -= optind; + argv += optind; + + if (argc > 0) + usage(); + if (!do_tcp && !do_udp) + errx(1, "one of -t or -u is needed"); + if (do_tcp && do_udp) + errx(1, "-t and -u are mutually exclusive"); + if (do_udp) + errx(1, "UDP unimplemented"); + if (do_tcp) + errx(1, "TCP unimplemented"); + + return 0; +}