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ping: add -H option for enabling reverse DNS lookup

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This is the reverse of the -n flag.

Submitted by:	Ján Sučan <sucanjan@gmail.com>
Sponsored by:	Google LLC (Google Summer of Code 2019)
Differential Revision:	https://reviews.freebsd.org/D21356
This commit is contained in:
Alan Somers 2019-08-21 21:05:15 +00:00
parent 71a2818142
commit 99f13ae12c
2 changed files with 17 additions and 6 deletions
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14
sbin/ping/ping.8
View File

@ -28,7 +28,7 @@
.\" @(#)ping.8 8.2 (Berkeley) 12/11/93
.\" $FreeBSD$
.\"
.Dd March 11, 2016
.Dd August 21, 2019
.Dt PING 8
.Os
.Sh NAME
@ -38,7 +38,7 @@
packets to network hosts
.Sh SYNOPSIS
.Nm
.Op Fl AaDdfnoQqRrv
.Op Fl AaDdfHnoQqRrv
.Op Fl c Ar count
.Op Fl G Ar sweepmaxsize
.Op Fl g Ar sweepminsize
@ -56,7 +56,7 @@ packets to network hosts
.Op Fl z Ar tos
.Ar host
.Nm
.Op Fl AaDdfLnoQqRrv
.Op Fl AaDdfHLnoQqRrv
.Op Fl c Ar count
.Op Fl I Ar iface
.Op Fl i Ar wait
@ -157,6 +157,14 @@ Specify the size of
.Tn ICMP
payload to start with when sending sweeping pings.
The default value is 0.
.It Fl H
Hostname output.
Try to do a reverse DNS lookup when displaying addresses.
This is the opposite of
.Fl n ,
and it is the default behavior.
.Nm
utility tries reverse-lookup by default.
.It Fl h Ar sweepincrsize
Specify the number of bytes to increment the size of
.Tn ICMP

9
sbin/ping/ping.c
View File

@ -297,7 +297,7 @@ main(int argc, char *const *argv)
outpack = outpackhdr + sizeof(struct ip);
while ((ch = getopt(argc, argv,
"Aac:DdfG:g:h:I:i:Ll:M:m:nop:QqRrS:s:T:t:vW:z:"
"Aac:DdfG:g:Hh:I:i:Ll:M:m:nop:QqRrS:s:T:t:vW:z:"
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
"P:"
@ -363,6 +363,9 @@ main(int argc, char *const *argv)
options |= F_SWEEP;
sweepmin = ltmp;
break;
case 'H':
options &= ~F_NUMERIC;
break;
case 'h': /* Packet size increment for ping sweep */
ltmp = strtol(optarg, &ep, 0);
if (*ep || ep == optarg || ltmp < 1)
@ -1743,11 +1746,11 @@ usage(void)
{
(void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
"usage: ping [-AaDdfnoQqRrv] [-c count] [-G sweepmaxsize] [-g sweepminsize]",
"usage: ping [-AaDdfHnoQqRrv] [-c count] [-G sweepmaxsize] [-g sweepminsize]",
" [-h sweepincrsize] [-i wait] [-l preload] [-M mask | time] [-m ttl]",
" " SECOPT " [-p pattern] [-S src_addr] [-s packetsize] [-t timeout]",
" [-W waittime] [-z tos] host",
" ping [-AaDdfLnoQqRrv] [-c count] [-I iface] [-i wait] [-l preload]",
" ping [-AaDdfHLnoQqRrv] [-c count] [-I iface] [-i wait] [-l preload]",
" [-M mask | time] [-m ttl]" SECOPT " [-p pattern] [-S src_addr]",
" [-s packetsize] [-T ttl] [-t timeout] [-W waittime]",
" [-z tos] mcast-group");