Updated pcap-snf.c to support --time-stamp-precision=nano option.

diff --git a/pcap-snf.c b/pcap-snf.c
index db5900005e97c8779b443ef0915e6c34a119e6ab..a2ba495d7bd2299aea1046dc2bf79a3ecc7b8a81 100644 (file)
--- a/pcap-snf.c
+++ b/pcap-snf.c
@@ -106,14 +106,23 @@ snf_setnonblock(pcap_t *p, int nonblock, char *errbuf)
 
 static inline
 struct timeval
-snf_timestamp_to_timeval(const int64_t ts_nanosec)
+snf_timestamp_to_timeval(const int64_t ts_nanosec, const int tstamp_precision)
 {
        struct timeval tv;
-       int32_t rem;
+       long tv_nsec;
+
        if (ts_nanosec == 0)
                return (struct timeval) { 0, 0 };
+
        tv.tv_sec = ts_nanosec / _NSEC_PER_SEC;
-       tv.tv_usec = (ts_nanosec % _NSEC_PER_SEC) / 1000;
+       tv_nsec = (ts_nanosec % _NSEC_PER_SEC);
+
+       /* libpcap expects tv_usec to be nanos if using nanosecond precision. */
+       if (tstamp_precision == PCAP_TSTAMP_PRECISION_NANO)
+               tv.tv_usec = tv_nsec;
+       else
+               tv.tv_usec = tv_nsec / 1000;
+
        return tv;
 }
 
@@ -167,7 +176,7 @@ snf_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
 
                if ((p->fcode.bf_insns == NULL) ||
                     bpf_filter(p->fcode.bf_insns, req.pkt_addr, req.length, caplen)) {
-                       hdr.ts = snf_timestamp_to_timeval(req.timestamp);
+                       hdr.ts = snf_timestamp_to_timeval(req.timestamp, p->opt.tstamp_precision);
                        hdr.caplen = caplen;
                        hdr.len = req.length;
                        callback(user, &hdr, req.pkt_addr);
@@ -466,6 +475,22 @@ snf_create(const char *device, char *ebuf, int *is_ours)
                return NULL;
        ps = p->priv;
 
+       /*
+        * We support microsecond and nanosecond time stamps. 
+        */
+       p->tstamp_precision_count = 2;
+       p->tstamp_precision_list = malloc(2 * sizeof(u_int));
+       if (p->tstamp_precision_list == NULL) {
+               snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
+                   pcap_strerror(errno));
+               if (p->tstamp_type_list != NULL)
+                       free(p->tstamp_type_list);
+               free(p);
+               return NULL;
+       }
+       p->tstamp_precision_list[0] = PCAP_TSTAMP_PRECISION_MICRO;
+       p->tstamp_precision_list[1] = PCAP_TSTAMP_PRECISION_NANO;
+
        p->activate_op = snf_activate;
        ps->snf_boardnum = boardnum;
        return p;