Added option -n,--no-dns which disables hostname lookup.
Signed-off-by: Vadim Kochan <[email protected]>
---
flowtop.8 | 3 +++
flowtop.c | 28 ++++++++++++++++++++++++++--
2 files changed, 29 insertions(+), 2 deletions(-)
diff --git a/flowtop.8 b/flowtop.8
index faa1da1..8feb1c0 100644
--- a/flowtop.8
+++ b/flowtop.8
@@ -117,6 +117,9 @@ separated by a newline.
.SS -t <time>, --interval <time>
Flow info refresh interval in seconds, default is 1s.
.PP
+.SS -n, --no-dns
+Do not perform hostname lookup
+.PP
.SS -v, --version
Show version information and exit.
.PP
diff --git a/flowtop.c b/flowtop.c
index 50064bb..5848264 100644
--- a/flowtop.c
+++ b/flowtop.c
@@ -26,6 +26,7 @@
#include <inttypes.h>
#include <poll.h>
#include <fcntl.h>
+#include <arpa/inet.h>
#include "die.h"
#include "xmalloc.h"
@@ -110,8 +111,9 @@ static struct flow_list flow_list;
static struct sysctl_params_ctx sysctl = { -1, -1 };
static unsigned int interval = 1;
+static bool resolve_dns = true;
-static const char *short_options = "vhTUsDIS46ut:";
+static const char *short_options = "vhTUsDIS46ut:n";
static const struct option long_options[] = {
{"ipv4", no_argument, NULL, '4'},
{"ipv6", no_argument, NULL, '6'},
@@ -123,6 +125,7 @@ static const struct option long_options[] = {
{"show-src", no_argument, NULL, 's'},
{"update", no_argument, NULL, 'u'},
{"interval", required_argument, NULL, 't'},
+ {"no-dns", no_argument, NULL, 'n'},
{"version", no_argument, NULL, 'v'},
{"help", no_argument, NULL, 'h'},
{NULL, 0, NULL, 0}
@@ -256,6 +259,7 @@ static void help(void)
" -s|--show-src Also show source, not only dest\n"
" -u|--update Update GeoIP databases\n"
" -t|--interval <time> Refresh time in seconds (default 1s)\n"
+ " -n|--no-dns Do not perform hostname lookup\n"
" -v|--version Print version and exit\n"
" -h|--help Print this help and exit\n\n"
"Examples:\n"
@@ -707,12 +711,22 @@ static void flow_entry_get_extended_revdns(struct
flow_entry *n,
struct sockaddr *sa;
struct hostent *hent;
+ build_bug_on(sizeof(n->rev_dns_src) != sizeof(n->rev_dns_dst));
+
switch (n->l3_proto) {
default:
bug();
case AF_INET:
flow_entry_get_sain4_obj(n, dir, &sa4);
+
+ if (!resolve_dns) {
+ inet_ntop(AF_INET, &sa4.sin_addr,
+ SELFLD(dir, rev_dns_src, rev_dns_dst),
+ sizeof(n->rev_dns_src));
+ return;
+ }
+
sa = (struct sockaddr *) &sa4;
sa_len = sizeof(sa4);
hent = gethostbyaddr(&sa4.sin_addr, sizeof(sa4.sin_addr),
AF_INET);
@@ -720,13 +734,20 @@ static void flow_entry_get_extended_revdns(struct
flow_entry *n,
case AF_INET6:
flow_entry_get_sain6_obj(n, dir, &sa6);
+
+ if (!resolve_dns) {
+ inet_ntop(AF_INET6, &sa6.sin6_addr,
+ SELFLD(dir, rev_dns_src, rev_dns_dst),
+ sizeof(n->rev_dns_src));
+ return;
+ }
+
sa = (struct sockaddr *) &sa6;
sa_len = sizeof(sa6);
hent = gethostbyaddr(&sa6.sin6_addr, sizeof(sa6.sin6_addr),
AF_INET6);
break;
}
- build_bug_on(sizeof(n->rev_dns_src) != sizeof(n->rev_dns_dst));
getnameinfo(sa, sa_len, SELFLD(dir, rev_dns_src, rev_dns_dst),
sizeof(n->rev_dns_src), NULL, 0, NI_NUMERICHOST);
@@ -1518,6 +1539,9 @@ int main(int argc, char **argv)
case 't':
interval = strtoul(optarg, NULL, 10);
break;
+ case 'n':
+ resolve_dns = false;
+ break;
case 'h':
help();
break;
--
2.6.1
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