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--- a/arpwatch.8 2016-03-02 13:06:36.712324185 +0100
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+++ b/arpwatch.8 2016-03-02 13:07:03.091306605 +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 promiscuous 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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--- a/arpwatch.c 2016-03-02 13:06:36.723324178 +0100
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+++ b/arpwatch.c 2016-03-02 13:11:20.650134958 +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[IF_NAMESIZE + 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;
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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);
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