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--- a/arpwatch.8	2016-01-26 10:13:58.344326599 +0100
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+++ b/arpwatch.8	2016-01-26 09:59:46.620048949 +0100
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@@ -27,7 +27,7 @@ arpwatch - keep track of ethernet/ip add
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 .na
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 .B arpwatch
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 [
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-.B -dN
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+.B -dNp
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 ] [
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 .B -f
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 .I datafile
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@@ -70,6 +70,10 @@ background and emailing the reports. Ins
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 .IR stderr .
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 .LP
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 The
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+.B -p
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+flag disables promiscous mode.
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+.LP
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+The
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 .B -f
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 flag is used to set the ethernet/ip address database filename.
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 The default is
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diff -rup arpwatch-2.1a15/arpwatch.c arpwatch-2.1a15-new/arpwatch.c
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--- a/arpwatch.c	2016-01-26 10:13:58.356326563 +0100
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+++ b/arpwatch.c	2016-01-26 10:13:37.273390029 +0100
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@@ -162,7 +162,7 @@ void dropprivileges(const char* user)
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 }
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 char *
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-try_dev(char *interface, pcap_t **pd, int *linktype, char *errbuf)
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+try_dev(char *interface, pcap_t **pd, int *linktype, int promisc, char *errbuf)
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 {
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 	register int snaplen, timeout;
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@@ -170,7 +170,7 @@ try_dev(char *interface, pcap_t **pd, in
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 				  sizeof(struct fddi_header)) + sizeof(struct ether_arp);
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 	timeout = 1000;
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-	*pd = pcap_open_live(interface, snaplen, 1, timeout, errbuf);
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+	*pd = pcap_open_live(interface, snaplen, promisc, timeout, errbuf);
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 	if (NULL == *pd) {
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 		syslog(LOG_ERR, "pcap open %s: %s", interface,  errbuf);
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 		return NULL;
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@@ -187,14 +187,14 @@ try_dev(char *interface, pcap_t **pd, in
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 }
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 char *
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-iterate_dev(char *arginterface, pcap_t **pd, int *linktype, char *errbuf)
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+iterate_dev(char *arginterface, pcap_t **pd, int *linktype, int promisc, char *errbuf)
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 {
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 	static char interface[64 + 1];
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 	pcap_if_t *alldevs;
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 	pcap_if_t *dev;
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 	if (NULL != arginterface) {
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-		return try_dev(arginterface, pd, linktype, errbuf);
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+		return try_dev(arginterface, pd, linktype, promisc, errbuf);
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 	} else {
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 		if (pcap_findalldevs(&alldevs, errbuf) == -1) {
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 			(void)fprintf(stderr, "%s: lookup_device: %s\n",
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@@ -203,7 +203,7 @@ iterate_dev(char *arginterface, pcap_t *
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 		}
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 		for (dev = alldevs; dev && (arginterface == NULL); dev = dev->next) {
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 			strncpy(interface, dev->name, strlen(dev->name)+1);
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-			arginterface = try_dev(interface, pd, linktype, errbuf);
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+			arginterface = try_dev(interface, pd, linktype, promisc, errbuf);
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 		}
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 		pcap_freealldevs(alldevs);
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 		return arginterface;
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@@ -224,6 +224,7 @@ main(int argc, char **argv)
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 	struct bpf_program code;
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 	char errbuf[PCAP_ERRBUF_SIZE];
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 	char* serveruser = NULL;
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+	int promisc = 1;
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 	if (argv[0] == NULL)
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 		prog = "arpwatch";
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@@ -242,7 +243,7 @@ main(int argc, char **argv)
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 	linktype = -1;
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 	rfilename = NULL;
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 	pd = NULL;
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-	while ((op = getopt(argc, argv, "df:i:n:Nr:u:e:s:")) != EOF)
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+	while ((op = getopt(argc, argv, "df:i:n:Nr:u:e:s:p")) != EOF)
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 		switch (op) {
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 		case 'd':
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@@ -304,6 +305,10 @@ main(int argc, char **argv)
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 			}
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 			break;
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+		case 'p':
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+			promisc = 0;
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+			break;
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+
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 		default:
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 			usage();
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 		}
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@@ -317,7 +322,7 @@ main(int argc, char **argv)
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 	} else {
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 		/* Determine interface if not specified */
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-		interface = iterate_dev(interface, &pd, &linktype, errbuf);
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+		interface = iterate_dev(interface, &pd, &linktype, promisc, errbuf);
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 		if (interface == NULL) {
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 			(void)fprintf(stderr, "%s: lookup_device: no suitable interface found\n",
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 						  prog);