pflog: handle OpenBSD's "rewriten" flag and addresses.

Derived from the OpenBSD tcpdump.

diff --git a/print-pflog.c b/print-pflog.c
index df5f8551b21838c9d63a5ca42c76bc0979f98396..f65ede295938ba0e39affe17c3c7a316ccf33eb3 100644 (file)
--- a/print-pflog.c
+++ b/print-pflog.c
@@ -31,6 +31,7 @@
 #include "netdissect.h"
 #include "extract.h"
 #include "af.h"
+#include "addrtostr.h"
 
 /*
  * pflog headers, at least as they exist now.
@@ -337,6 +338,34 @@ static const struct tok pf_directions_other[] = {
        { 0,            NULL }
 };
 
+static void
+print_pf_addr(netdissect_options *ndo, const char *tag, u_int naf,
+    const struct pf_addr *addr, const nd_uint16_t port)
+{
+       char buf[INET6_ADDRSTRLEN];
+       uint16_t portnum;
+
+       ND_PRINT("%s ", tag);
+       ND_TCHECK_SIZE(addr);
+       switch (naf) {
+
+       case BSD_AF_INET:
+               addrtostr(addr->v4, buf, sizeof(buf));
+               break;
+
+       case BSD_AF_INET6_BSD:
+               addrtostr6(addr->v6, buf, sizeof(buf));
+               break;
+
+       default:
+               strlcpy(buf, "?", sizeof(buf));
+               break;
+       }
+       ND_PRINT("%s:", buf);
+       portnum = GET_BE_U_2(port);
+       ND_PRINT("%u", portnum);
+}
+
 static void
 pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr)
 {
@@ -427,6 +456,20 @@ pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr)
        }
        nd_printjnp(ndo, (const u_char*)hdr->ifname, PFLOG_IFNAMSIZ);
        ND_PRINT(": ");
+       if (length == PFLOG_HEADER_LEN_OPENBSD) {
+               if (ndo->ndo_vflag && GET_U_1(hdr->u.openbsd.rewritten)) {
+                       uint8_t naf;
+
+                       ND_PRINT("[rewritten: ");
+                       naf = GET_U_1(hdr->u.openbsd.naf);
+                       print_pf_addr(ndo, "src", naf, &hdr->u.openbsd.saddr,
+                           hdr->u.openbsd.sport);
+                       ND_PRINT(", ");
+                       print_pf_addr(ndo, "src", naf, &hdr->u.openbsd.daddr,
+                           hdr->u.openbsd.dport);
+                       ND_PRINT("; ");
+               }
+       }
 }
 
 void