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From d8d7143f1c0ca5a36f7d1f1092d360afbf4e71d3 Mon Sep 17 00:00:00 2001
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From: rpm-build <rpm-build>
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Date: Mon, 20 Oct 2014 13:26:38 +0200
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Subject: [PATCH 06/13] Introduce -nn option
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This changes the semantics on -n option so only namelookups are skipped. Port
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numbers *are* translated to their string representations. Option -nn then has
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the same semantics as -n had originally.
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---
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addrtoname.c | 4 ++--
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tcpdump.1.in | 6 +++++-
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2 files changed, 7 insertions(+), 3 deletions(-)
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diff --git a/addrtoname.c b/addrtoname.c
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index a1e360d..f8e777c 100644
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--- a/addrtoname.c
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+++ b/addrtoname.c
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@@ -822,7 +822,7 @@ init_servarray(netdissect_options *ndo)
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while (table->name)
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table = table->nxt;
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- if (ndo->ndo_nflag) {
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+ if (ndo->ndo_nflag > 1) {
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(void)snprintf(buf, sizeof(buf), "%d", port);
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table->name = strdup(buf);
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} else
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@@ -1245,7 +1245,7 @@ init_addrtoname(netdissect_options *ndo, uint32_t localnet, uint32_t mask)
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f_localnet = localnet;
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f_netmask = mask;
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}
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- if (ndo->ndo_nflag)
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+ if (ndo->ndo_nflag > 1)
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/*
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* Simplest way to suppress names.
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*/
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diff --git a/tcpdump.1.in b/tcpdump.1.in
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index 081e5d1..f233934 100644
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--- a/tcpdump.1.in
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+++ b/tcpdump.1.in
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@@ -544,7 +544,11 @@ Use \fIsecret\fP as a shared secret for validating the digests found in
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TCP segments with the TCP-MD5 option (RFC 2385), if present.
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.TP
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.B \-n
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-Don't convert addresses (i.e., host addresses, port numbers, etc.) to names.
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+Don't convert host addresses to names. This can be used to avoid
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+DNS lookups.
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+.TP
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+.B \-nn
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+Don't convert protocol and port numbers etc. to names either.
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.TP
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.B \-N
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Don't print domain name qualification of host names.
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--
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2.13.5
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