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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
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=351354
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 .\" @(#)ping.8 8.2 (Berkeley) 12/11/93
.\" $FreeBSD$ .\" $FreeBSD$
.\" .\"
.Dd March 11, 2016 .Dd August 21, 2019
.Dt PING 8 .Dt PING 8
.Os .Os
.Sh NAME .Sh NAME
@ -38,7 +38,7 @@
packets to network hosts packets to network hosts
.Sh SYNOPSIS .Sh SYNOPSIS
.Nm .Nm
.Op Fl AaDdfnoQqRrv .Op Fl AaDdfHnoQqRrv
.Op Fl c Ar count .Op Fl c Ar count
.Op Fl G Ar sweepmaxsize .Op Fl G Ar sweepmaxsize
.Op Fl g Ar sweepminsize .Op Fl g Ar sweepminsize
@ -56,7 +56,7 @@ packets to network hosts
.Op Fl z Ar tos .Op Fl z Ar tos
.Ar host .Ar host
.Nm .Nm
.Op Fl AaDdfLnoQqRrv .Op Fl AaDdfHLnoQqRrv
.Op Fl c Ar count .Op Fl c Ar count
.Op Fl I Ar iface .Op Fl I Ar iface
.Op Fl i Ar wait .Op Fl i Ar wait
@ -157,6 +157,14 @@ Specify the size of
.Tn ICMP .Tn ICMP
payload to start with when sending sweeping pings. payload to start with when sending sweeping pings.
The default value is 0. 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 .It Fl h Ar sweepincrsize
Specify the number of bytes to increment the size of Specify the number of bytes to increment the size of
.Tn ICMP .Tn ICMP

9
sbin/ping/ping.c
View File

@ -297,7 +297,7 @@ main(int argc, char *const *argv)
outpack = outpackhdr + sizeof(struct ip); outpack = outpackhdr + sizeof(struct ip);
while ((ch = getopt(argc, argv, 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
#ifdef IPSEC_POLICY_IPSEC #ifdef IPSEC_POLICY_IPSEC
"P:" "P:"
@ -363,6 +363,9 @@ main(int argc, char *const *argv)
options |= F_SWEEP; options |= F_SWEEP;
sweepmin = ltmp; sweepmin = ltmp;
break; break;
case 'H':
options &= ~F_NUMERIC;
break;
case 'h': /* Packet size increment for ping sweep */ case 'h': /* Packet size increment for ping sweep */
ltmp = strtol(optarg, &ep, 0); ltmp = strtol(optarg, &ep, 0);
if (*ep || ep == optarg || ltmp < 1) 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", (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]", " [-h sweepincrsize] [-i wait] [-l preload] [-M mask | time] [-m ttl]",
" " SECOPT " [-p pattern] [-S src_addr] [-s packetsize] [-t timeout]", " " SECOPT " [-p pattern] [-S src_addr] [-s packetsize] [-t timeout]",
" [-W waittime] [-z tos] host", " [-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]", " [-M mask | time] [-m ttl]" SECOPT " [-p pattern] [-S src_addr]",
" [-s packetsize] [-T ttl] [-t timeout] [-W waittime]", " [-s packetsize] [-T ttl] [-t timeout] [-W waittime]",
" [-z tos] mcast-group"); " [-z tos] mcast-group");