In "init_linktype()", map DLT_ codes that don't have the same value as

the equivalent PCAP_ENCAP_ codes to the corresponding PCAP_ENCAP_ code
so that the code generator need check only the PCAP_ENCAP_ codes.

Handle PCAP_ENCAP_PPP_HDLC just like PCAP_ENCAP_PPP.

diff --git a/gencode.c b/gencode.c
index a5cdd1a403b192ae41fd69048a26d6c480d46919..e66223b135773ef6e48129669c53943af78f8a09 100644 (file)
--- a/gencode.c
+++ b/gencode.c
@@ -21,7 +21,7 @@
  */
 #ifndef lint
 static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.117 2000-09-17 04:04:36 guy Exp $ (LBL)";
+    "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.118 2000-09-18 06:39:44 guy Exp $ (LBL)";
 #endif
 
 #ifdef HAVE_CONFIG_H
@@ -538,10 +538,73 @@ static void
 init_linktype(type)
        int type;
 {
-       linktype = type;
-
+       /*
+        * Map DLT_ codes that don't have the same value as the
+        * equivalent PCAP_ENCAP_ codes to the corresponding PCAP_ENCAP_
+        * code.
+        *
+        * Even though "pcap_open_live()" in "pcap-bpf.c" does a
+        * similar mapping, we do that mapping here as well, to
+        * handle filters constructed for savefiles.
+        *
+        * XXX - should we do this mapping in "savefile.c"?  Doing so
+        * might cause programs that read one or more capture files
+        * and write another capture file with the same type as
+        * the input file(s) to use PCAP_ENCAP_ values that aren't
+        * supported by the libpcap on the system that wrote the original
+        * capture file, so we might not want to do that.
+        */
        switch (type) {
 
+#ifdef DLT_ATM_RFC1483
+       case DLT_ATM_RFC1483:
+               linktype = PCAP_ENCAP_ATM_RFC1483;
+               break;
+#endif
+
+#ifdef DLT_RAW
+       case DLT_RAW:
+               linktype = PCAP_ENCAP_RAW;
+               break;
+#endif
+
+#ifdef DLT_SLIP_BSDOS
+       case DLT_SLIP_BSDOS:
+               linktype = PCAP_ENCAP_SLIP_BSDOS;
+               break;
+#endif
+
+#ifdef DLT_PPP_BSDOS
+       case DLT_PPP_BSDOS:
+               linktype = PCAP_ENCAP_PPP_BSDOS;
+               break;
+#endif
+
+#ifdef DLT_CIP
+       case DLT_CIP:
+               linktype = PCAP_ENCAP_ATM_CLIP;
+               break;
+#endif
+
+#ifdef DLT_ATM_CLIP
+       case DLT_ATM_CLIP:
+               linktype = PCAP_ENCAP_ATM_CLIP;
+               break;
+#endif
+
+#ifdef DLT_PPP_SERIAL
+       case DLT_PPP_SERIAL:
+               linktype = PCAP_ENCAP_PPP_HDLC;
+               break;
+#endif
+
+       default:
+               linktype = type;
+               break;
+       }
+
+       switch (linktype) {
+
        case PCAP_ENCAP_ETHERNET:
                off_linktype = 12;
                off_nl = 14;
@@ -570,6 +633,7 @@ init_linktype(type)
 
        case PCAP_ENCAP_PPP:
        case PCAP_ENCAP_C_HDLC:
+       case PCAP_ENCAP_PPP_HDLC:
                off_linktype = 2;
                off_nl = 4;
                return;
@@ -690,6 +754,7 @@ gen_linktype(proto)
                return gen_false();
 
        case PCAP_ENCAP_PPP:
+       case PCAP_ENCAP_PPP_HDLC:
                if (proto == ETHERTYPE_IP)
                        proto = PPP_IP;                 /* XXX was 0x21 */
 #ifdef INET6