ping: Fix unwanted bell on unreachable address

Commit 4471ac629cf2603f4b8b45e042e072c992ce25a5 caused regression for IPv6
that ping -a IP6_ADDR beeps also on wrong address (i.e.  when "Address
unreachable"):

    $ ping -a -c1 fd00:1:1:1::15
    PING fd00:1:1:1::15(fd00:1:1:1::15) 56 data bytes
    From fd00:1:1:1::2 icmp_seq=1 Destination unreachable: Address unreachable

    --- fd00:1:1:1::15 ping statistics ---
    1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0m

It should only bell when ping returns correctly.

Another (fixed) regression was that ping after exit printed error "pipe N",
where N is number of counts. Error was result of code from ping_common.c:
printf("%spipe %d", comma, pipesize);

4471ac6 was wrong that code for sock->working_recverr == 1 should stay,
sock->working_recverr should be removed.

Thus changes:
* ping.c: put back "stronger filter" for raw socket but (unlike before
  4471ac6) exit with 2 if setsockopt(ICMP_FILTER) fails
* ping6_common.c: put back setsockopt(IPV6_RECVERR), but (unlike before
  4471ac6) exit with 2 if it fails
* ping6_common.c: remove ICMP6_FILTER_SETPASS calls. These caused error "pipe N".
* ping6_common.c: return 0 after acknowledge() in ping6_parse_reply

Fixes: 4471ac6 ("ping: Remove workaround for bug in IP_RECVERR on raw sockets")
Fixes: https://github.com/iputils/iputils/issues/182
Reported-by: Luiz Angelo Daros de Luca <luizluca@tre-sc.jus.br>
Signed-off-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Sami Kerola <kerolasa@iki.fi>

2 files changed, 15 insertions, 12 deletions

diff --git a/ping.c b/ping.c
index 3debd82..34653be 100644
--- a/ping.c
+++ b/ping.c
@@ -877,6 +877,16 @@ int ping4_receive_error_msg(socket_st *sock)
 
 		acknowledge(ntohs(icmph.un.echo.sequence));
 
+		if (sock->socktype == SOCK_RAW) {
+			struct icmp_filter filt;
+
+			filt.data = ~((1 << ICMP_SOURCE_QUENCH) |
+				      (1 << ICMP_REDIRECT) |
+				      (1 << ICMP_ECHOREPLY));
+			if (setsockopt(sock->fd, SOL_RAW, ICMP_FILTER, (const void *)&filt,
+				       sizeof(filt)) == -1)
+				error(2, errno, "setsockopt(ICMP_FILTER)");
+		}
 		net_errors++;
 		nerrors++;
 		if (options & F_QUIET)
diff --git a/ping6_common.c b/ping6_common.c
index f2b91d8..6cc5404 100644
--- a/ping6_common.c
+++ b/ping6_common.c
@@ -726,6 +726,10 @@ int ping6_run(int argc, char **argv, struct addrinfo *ai, struct socket_st *sock
 	if (!(packet = (unsigned char *)malloc((unsigned int)packlen)))
 		error(2, errno, _("memory allocation failed"));
 
+	hold = 1;
+	if (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_RECVERR, (const void *)&hold, sizeof hold))
+		error(2, errno, "IPV6_RECVERR");
+
 	/* Estimate memory eaten by single packet. It is rough estimate.
 	 * Actually, for small datalen's it depends on kernel side a lot. */
 	hold = datalen + 8;
@@ -754,11 +758,6 @@ int ping6_run(int argc, char **argv, struct addrinfo *ai, struct socket_st *sock
 
 		ICMP6_FILTER_SETBLOCKALL(&filter);
 
-		ICMP6_FILTER_SETPASS(ICMP6_DST_UNREACH, &filter);
-		ICMP6_FILTER_SETPASS(ICMP6_PACKET_TOO_BIG, &filter);
-		ICMP6_FILTER_SETPASS(ICMP6_TIME_EXCEEDED, &filter);
-		ICMP6_FILTER_SETPASS(ICMP6_PARAM_PROB, &filter);
-
 		if (niquery_is_enabled())
 			ICMP6_FILTER_SETPASS(IPUTILS_NI_ICMP6_REPLY, &filter);
 		else
@@ -1254,13 +1253,7 @@ ping6_parse_reply(socket_st *sock, struct msghdr *msg, int cc, void *addr, struc
 			    !is_ours(sock, icmph1->icmp6_id))
 				return 1;
 			acknowledge(ntohs(icmph1->icmp6_seq));
-			nerrors++;
-			if (options & F_FLOOD) {
-				write_stdout("\bE", 2);
-				return 0;
-			}
-			print_timestamp();
-			printf(_("From %s: icmp_seq=%u "), pr_addr(from, sizeof *from), ntohs(icmph1->icmp6_seq));
+			return 0;
 		} else {
 			/* We've got something other than an ECHOREPLY */
 			if (!(options & F_VERBOSE) || uid)