configure.ac: modernize for autoconf 2.71

Without -d it won't be set, regardless of the ip_no_pmtu_disc sysctl
setting on Linux.

.gitignore

@@ -1,3 +1,26 @@
-echoc
+*.la
+*.lo
 *.o
 *~
+.deps
+.libs
+m4/*.m4
+Makefile
+Makefile.in
+aclocal.m4
+autom4te.cache
+compile
+config.guess
+config.h
+config.h.in
+config.log
+config.status
+config.sub
+configure
+depcomp
+install-sh
+libtool
+ltmain.sh
+missing
+stamp-*
+obj*

LICENSE

@@ -0,0 +1,13 @@
+ Copyright (c) 2012-2015 Matthieu Herrb <matthieu@herrb.eu>
+ 
+ Permission to use, copy, modify, and distribute this software for any
+ purpose with or without fee is hereby granted, provided that the above
+ copyright notice and this permission notice appear in all copies.
+ 
+ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Makefile

@@ -1,19 +0,0 @@
-#
-
-PROG= echoc
-SRCS= echoc.c
-
-OBJS= $(SRCS:%.c=%.o)
-
-LIBS=
-
-all: $(PROG)
-
-$(PROG): $(OBJS)
-	$(CC) -o $@ $(OBJS) $(LIBS)
-
-clean:
-	rm -f $(OBJS) $(PROG)
-
-.c.o:
-	$(CC) -c $(CFLAGS) -o $@ $<

Makefile.am

@@ -0,0 +1,5 @@
+bin_PROGRAMS = echoc
+
+AM_CFLAGS = -g -Wall
+
+dist_man_MANS = echoc.1

README

@@ -1,21 +0,0 @@
-echoc is a small network test program that sends UDP packets to the
-echo service (it should be activated in [x]inetd on the target host).
-echoc displays the start/end date of loss of connectivity.
-
-It's distributed under the ISC license:
-
-/*
- * Copyright (c) 2012 Matthieu Herrb <matthieu@herrb.eu>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */

README.md

@@ -0,0 +1,45 @@
+echoc
+=====
+
+echoc is a small network test program that sends UDP packets to the
+echo service (it should be activated in [x]inetd on the target host).
+echoc displays the start/end date of loss of connectivity.
+
+Building
+--------
+
+From git, run:
+
+```
+./autogen.sh
+make
+make install
+```
+
+From a source tarball, run:
+
+```
+./configure
+make
+make install
+```
+
+Licence
+-------
+
+Echoc is distributed under the ISC license:
+
+  Copyright (c) 2012-2015 Matthieu Herrb <matthieu@herrb.eu>
+  
+  Permission to use, copy, modify, and distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+  
+  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+

autogen.sh

@@ -0,0 +1,13 @@
+#! /bin/sh
+srcdir=`dirname "$0"`
+test -z "$srcdir" && srcdir=.
+
+ORIGDIR=`pwd`
+cd "$srcdir"
+
+autoreconf -v --install || exit 1
+cd "$ORIGDIR" || exit $?
+
+if test -z "$NOCONFIGURE"; then
+    exec "$srcdir"/configure "$@"
+fi

configure.ac

@@ -0,0 +1,11 @@
+AC_PREREQ([2.71])
+AC_INIT([echoc],[0.6.99],[https://gitlab.laas.fr/matthieu/echoc],[echoc])
+AM_INIT_AUTOMAKE([foreign dist-bzip2])
+AC_CONFIG_MACRO_DIR([m4])
+AC_PROG_CC
+
+AC_CHECK_HEADERS([bsd/stdlib.h])
+AC_SEARCH_LIBS(strtonum, [bsd])
+
+AC_CONFIG_FILES([Makefile])
+AC_OUTPUT

echoc.1

@@ -0,0 +1,80 @@
+.\"
+.\" Copyright (c) 2012-2015 Matthieu Herrb <matthieu@herrb.eu>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd $Mdocdate: September 29 2015 $
+.Dt ECHOC 1
+.Os
+.Sh NAME
+.Nm echoc
+.Nd send UDP packets to network hosts and wait for replies
+.Sh SYNOPSYS
+.Nm echoc
+.Bk -words
+.Op Fl dv
+.Op Fl c Ar count
+.Op Fl i Ar ms
+.Op Fl l Ar len
+.Op Fl p Ar port
+.Op Fl t Ar ms
+.Ar host
+.Ek
+.Sh DESCRIPTION
+.Nm
+sends UDP packets to the 
+.Dv ECHO
+service on the remote 
+.Ar host .
+.Nm 
+displays the start/end date of loss of connectivity.
+The options are as follow:
+.Bl -tag -width Ds
+.It Fl c Ar count
+Stop sending after
+.Ar count
+packets have been sent.
+.It Fl d
+Set the 
+.Dv Don't Fragment
+bit on outgoing datagrams, on systems that allow programs to control it.
+On some systems (MacOSX, OpenBSD) this option will do nothing and the
+generated datagrams will have the DF bit set or not, depending on
+system settings.
+.It Fl i Ar ms
+wait
+.Ar ms
+milliseconds between every packet (default: 100 ms).
+.It Fl l Ar len
+Send packets of length
+.Ar len
+bytes (default: 10).
+.It Fl p Ar port
+Set destination port to 
+.Ar port
+(default: 7 - echo).
+.It Fl t Ar ms
+Wait at most
+.Ar ms
+milliseconds for the reply before declaring the connection dead
+(default: 500ms).
+.El
+.Sh SEE ALSO
+.Xr nc 1 ,
+.Xr ping 8 ,
+.Xr ping6 8
+.Sh AUTHOR
+The
+.Nm
+utility was written for tetaneutral.net by Matthieu Herrb.
+

echoc.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012 Matthieu Herrb <matthieu@herrb.eu>
+ * Copyright (c) 2012-2015 Matthieu Herrb <matthieu@herrb.eu>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -18,6 +18,11 @@
 #include <sys/socket.h>
 #include <sys/time.h>
 
+#include <limits.h>
+#ifdef HAVE_BSD_STDLIB_H
+#include <bsd/stdlib.h>
+#endif
+
 #include <err.h>
 #include <errno.h>
 #include <netdb.h>
@@ -32,21 +37,34 @@
 
 int sock = -1;
 int verbose = 0;
+int aborting = 0;
 struct sockaddr *server;
 socklen_t serverlen;
 unsigned int seq = 0;
+size_t len = 10;
 
 static void
 usage(void)
 {
-	errx(2, "usage: echoc [-i ms][-t ms][-v] server");
+	errx(2, "usage: echoc [-c nbr][-d][-i ms][-l len][-p port][-t ms][-v] server");
+}
+
+static void
+sigint_handler(int unused)
+{
+	aborting = 1;
 }
 
 static void
 send_packet(int unused)
 {
-	if (sendto(sock, &seq, sizeof(seq), 0, server,
+       char *buf;
-		serverlen) != sizeof(seq)) {
+	buf = malloc(len);
+	if (buf == NULL)
+		return;
+	snprintf(buf, len, "%d", seq);
+	if (sendto(sock, buf, len, 0, server,
+		serverlen) != len) {
 		if (verbose)
 			warn("sendto");
 	}
@@ -59,7 +77,10 @@ int
 main(int argc, char *argv[])
 {
 	char name[NI_MAXHOST];
-	char buf[80];
+	char *recvbuf;
+	const char *errstr;
+	char date[80];
+	char *port = "echo";
 	struct sockaddr_storage client;
 	struct addrinfo hints, *res, *res0;
 	struct itimerval itv;
@@ -68,20 +89,35 @@ main(int argc, char *argv[])
 	struct tm *tm;
 	struct pollfd pfd[1];
 	socklen_t addrlen;
-	long interval = 100; 	/* default interval (ms) */
+	long interval = 100;	/* default interval (ms) */
 	long timeout = 500;	/* default timeout (ms) */
 	int ch;
 	int nfds, received = 0;
-	int error, buffer, last = -1;
+	int error, last = -1;
 	int disconnected;
+	int nofragment = 0;
+	int we_count = 0, counter = 0; /* don't loop forever */
 	extern int optind;
 
 	setbuf(stdout, NULL);
-	while ((ch = getopt(argc, argv, "i:t:v")) != -1) {
+	while ((ch = getopt(argc, argv, "c:di:l:p:t:v")) != -1) {
 		switch (ch) {
+		case 'c':
+			we_count++;
+			counter = atoi(optarg);
+			break;
+		case 'd':
+			nofragment++;
+			break;
 		case 'i':
 			interval = atoi(optarg);
 			break;
+		case 'l':
+			len = atoi(optarg);
+			break;
+		case 'p':
+			port = optarg;
+			break;
 		case 't':
 			timeout = atoi(optarg);
 			break;
@@ -99,7 +135,8 @@ main(int argc, char *argv[])
 
 	if (interval <= 0 || timeout <= 0)
 		errx(2, "interval and timeout must be > 0");
-
+	if (we_count && counter < 2)
+		errx(2, "can't count down from nothing");
 	/* force timeout >= interval */
 	if (timeout < interval) {
 		timeout = interval;
@@ -111,7 +148,7 @@ main(int argc, char *argv[])
 	memset(&hints, 0, sizeof(hints));
 	hints.ai_family = PF_UNSPEC;
 	hints.ai_socktype = SOCK_DGRAM;
-	error = getaddrinfo(argv[0], "echo", &hints, &res0);
+	error = getaddrinfo(argv[0], port, &hints, &res0);
 	if (error)
 		errx(1, "%s: %s", argv[0], gai_strerror(error));
 
@@ -130,6 +167,22 @@ main(int argc, char *argv[])
 	disconnected = 0;
 	memset(&client, 0, sizeof(client));
 
+	recvbuf = malloc(len);
+	if (recvbuf == NULL)
+		err(2, "malloc receive buffer");
+
+#ifdef IP_MTU_DISCOVER
+	/* set the DF flag ? */
+	if (nofragment)
+		ch = IP_PMTUDISC_DO;
+	else
+		ch = IP_PMTUDISC_DONT;
+	if (setsockopt(sock, IPPROTO_IP, IP_MTU_DISCOVER, &ch, sizeof(ch)) < 0)
+	       err(2, "setsockopt IP_MTU_DISCOVER");
+#endif
+	signal(SIGALRM, send_packet);
+	signal(SIGINT, sigint_handler);
+
 	/* timer values */
 	itv.it_interval.tv_usec = interval*1000;
 	itv.it_interval.tv_sec = 0;
@@ -138,13 +191,14 @@ main(int argc, char *argv[])
 	if (setitimer(ITIMER_REAL, &itv, NULL) == -1)
 		err(2, "setitimer");
 
-	signal(SIGALRM, send_packet);
-
 	gettimeofday(&last_ts, NULL);
+	tm = localtime((time_t *)&last_ts.tv_sec);
+	strftime(date, sizeof(date), "%F %T", tm);
+	printf("%s.%06ld: starting\n", date, last_ts.tv_usec);
 
-	while (1) {
+	while (!aborting) {
 		/* poll() loop to handle interruptions by SIGALRM */
-		while (1) {
+		while (!aborting) {
 			pfd[0].fd = sock;
 			pfd[0].events = POLLIN;
 			nfds = poll(pfd, 1, timeout);
@@ -160,31 +214,33 @@ main(int argc, char *argv[])
 				break;
 			}
 		}
+		if (aborting)
+			break;
 		if ((nfds == 0)) {
 			if (verbose)
 				printf("%d packet(s) dropped in %ld.%06ld s\n",
-				    seq - last, diff.tv_sec, diff.tv_usec);
+				    seq - last, (long)diff.tv_sec, diff.tv_usec);
 
 			if (disconnected == 1) {
 				tm = localtime((time_t *)&last_ts.tv_sec);
-				strftime(buf, sizeof(buf), "%F %T", tm);
+				strftime(date, sizeof(date), "%F %T", tm);
 				printf("%s.%06ld: lost connection\n",
-				    buf, last_ts.tv_usec);
+				    date, last_ts.tv_usec);
 			}
 			continue;
 		}
 		addrlen = sizeof(client);
-		if ((received = recvfrom(sock, &buffer, sizeof(buffer),
+		if ((received = recvfrom(sock, recvbuf, len,
 			    MSG_DONTWAIT,
 			    (struct sockaddr *) &client,
-			    &addrlen)) != sizeof(buffer)) {
+			    &addrlen)) != len) {
 			warn("recvfrom");
 		}
 
 		if (verbose && (serverlen != addrlen ||
 			memcmp(&client, server, addrlen) != 0)) {
 			if ((error = getnameinfo((struct sockaddr *)&client,
-				addrlen, name, sizeof(name),
+				    addrlen, name, sizeof(name),
 				    NULL, 0, NI_DGRAM)) != 0) {
 				warnx("%s", gai_strerror(error));
 			} else {
@@ -194,17 +250,32 @@ main(int argc, char *argv[])
 		}
 		if (disconnected) {
 			tm = localtime((time_t *)&now.tv_sec);
-			strftime(buf, sizeof(buf), "%F %T", tm);
+			strftime(date, sizeof(date), "%F %T", tm);
 			printf("%s.%06ld: connection is back "
 			    "dropped %d packets\n",
-			    buf, now.tv_usec, seq - last);
+			    date, now.tv_usec, seq - last);
 			disconnected = 0;
 		}
-		last = buffer;
+		last = strtonum(recvbuf, 0, INT_MAX, &errstr);
+		if (errstr)
+			errx(1, "invalid reply %s", errstr);
 		memcpy(&last_ts, &now, sizeof(struct timeval));
 		if (verbose)
-			printf("received %d %ld.%06ld\n", buffer, 
+			printf("received %d %ld.%06ld\n", last,
 			    (long)diff.tv_sec, diff.tv_usec);
+		if (we_count) {
+			counter--;
+			if (counter == 0) {
+				printf("all job done\n");
+				break;
+			}
+		}
+	}
+	if (aborting) {
+		gettimeofday(&now, NULL);
+		tm = localtime((time_t *)&now.tv_sec);
+		strftime(date, sizeof(date), "%F %T", tm);
+		printf("%s.%06ld: aborting\n", date, now.tv_usec);
 	}
 	close(sock);
 	exit(0);