/*
- *
+ *
* Tampere University of Technology - Telecommunications Laboratory
*
* Permission to use, copy, modify and distribute this
* documentation, and that the use of this software is
* acknowledged in any publications resulting from using
* the software.
- *
+ *
* TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS
* SOFTWARE.
- *
+ *
*/
-#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-cip.c,v 1.4 2000-04-28 11:34:12 itojun Exp $ (LBL)";
-#endif
+/* \summary: Classical-IP over ATM printer */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/socket.h>
+#include <string.h>
-#include <net/if.h>
+#include <netdissect-stdinc.h>
-#include <netinet/in.h>
-#include <netinet/if_ether.h>
-#include <netinet/in_systm.h>
-#include <netinet/ip.h>
-#include <netinet/ip_var.h>
-#include <netinet/udp.h>
-#include <netinet/udp_var.h>
-#include <netinet/tcp.h>
-
-#include <stdio.h>
-#include <pcap.h>
-
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
-const u_char *packetp;
-const u_char *snapend;
-
-#define RFC1483LLC_LEN 8
-
-static unsigned char rfcllc[] = {
+static const unsigned char rfcllc[] = {
0xaa, /* DSAP: non-ISO */
0xaa, /* SSAP: non-ISO */
0x03, /* Ctrl: Unnumbered Information Command PDU */
0x00 };
static inline void
-cip_print(register const u_char *bp, int length)
+cip_print(netdissect_options *ndo, u_int length)
{
- int i;
-
- if (memcmp(rfcllc, bp, sizeof(rfcllc))) {
- if (qflag) {
- for (i = 0;i < RFC1483LLC_LEN; i++)
- (void)printf("%2.2x ",bp[i]);
- } else {
- for (i = 0;i < RFC1483LLC_LEN - 2; i++)
- (void)printf("%2.2x ",bp[i]);
- etherproto_string(((u_short*)bp)[3]);
- }
- } else {
- if (qflag)
- (void)printf("(null encapsulation)");
- else {
- (void)printf("(null encap)");
- etherproto_string(ETHERTYPE_IP);
- }
- }
+ /*
+ * There is no MAC-layer header, so just print the length.
+ */
+ ND_PRINT((ndo, "%u: ", length));
}
/*
- * This is the top level routine of the printer. 'p' is the points
- * to the raw header of the packet, 'tvp' is the timestamp,
- * 'length' is the length of the packet off the wire, and 'caplen'
+ * This is the top level routine of the printer. 'p' points
+ * to the LLC/SNAP or raw header of the packet, 'h->ts' is the timestamp,
+ * 'h->len' is the length of the packet off the wire, and 'h->caplen'
* is the number of bytes actually captured.
*/
-void
-cip_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
+u_int
+cip_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
{
- int caplen = h->caplen;
- int length = h->len;
- u_short ether_type;
- u_short extracted_ethertype;
- u_short *bp;
-
- ts_print(&h->ts);
-
- if (memcmp(rfcllc, p, sizeof(rfcllc))==0 && caplen < RFC1483LLC_LEN) {
- printf("[|cip]");
- goto out;
+ u_int caplen = h->caplen;
+ u_int length = h->len;
+ size_t cmplen;
+ int llc_hdrlen;
+
+ cmplen = sizeof(rfcllc);
+ if (cmplen > caplen)
+ cmplen = caplen;
+ if (cmplen > length)
+ cmplen = length;
+
+ if (ndo->ndo_eflag)
+ cip_print(ndo, length);
+
+ if (cmplen == 0) {
+ ND_PRINT((ndo, "[|cip]"));
+ return 0;
}
-
- if (eflag)
- cip_print(p, length);
-
- /*
- * Some printers want to get back at the ethernet addresses,
- * and/or check that they're not walking off the end of the packet.
- * Rather than pass them all the way down, we set these globals.
- */
- packetp = p;
- snapend = p + caplen;
-
- if (memcmp(rfcllc, p, sizeof(rfcllc))==0) {
- length -= RFC1483LLC_LEN;
- caplen -= RFC1483LLC_LEN;
- bp = (u_short *)p;
- p += RFC1483LLC_LEN;
- ether_type = ntohs(bp[3]);
+ if (memcmp(rfcllc, p, cmplen) == 0) {
+ /*
+ * LLC header is present. Try to print it & higher layers.
+ */
+ llc_hdrlen = llc_print(ndo, p, length, caplen, NULL, NULL);
+ if (llc_hdrlen < 0) {
+ /* packet type not known, print raw packet */
+ if (!ndo->ndo_suppress_default_print)
+ ND_DEFAULTPRINT(p, caplen);
+ llc_hdrlen = -llc_hdrlen;
+ }
} else {
- ether_type = ETHERTYPE_IP;
- bp = (u_short *)p;
+ /*
+ * LLC header is absent; treat it as just IP.
+ */
+ llc_hdrlen = 0;
+ ip_print(ndo, p, length);
}
- /*
- * Is it (gag) an 802.3 encapsulation?
- */
- extracted_ethertype = 0;
- if (ether_type < ETHERMTU) {
- /* Try to print the LLC-layer header & higher layers */
- if (llc_print(p, length, caplen, NULL, NULL)==0) {
- /* ether_type not known, print raw packet */
- if (!eflag)
- cip_print((u_char *)bp, length);
- if (extracted_ethertype) {
- printf("(LLC %s) ",
- etherproto_string(htons(extracted_ethertype)));
- }
- if (!xflag && !qflag)
- default_print(p, caplen);
- }
- } else if (ether_encap_print(ether_type, p, length, caplen) == 0) {
- /* ether_type not known, print raw packet */
- if (!eflag)
- cip_print((u_char *)bp, length + RFC1483LLC_LEN);
- if (!xflag && !qflag)
- default_print(p, caplen);
- }
- if (xflag)
- default_print(p, caplen);
- out:
- putchar('\n');
+ return (llc_hdrlen);
}
+
+
+/*
+ * Local Variables:
+ * c-style: whitesmith
+ * c-basic-offset: 8
+ * End:
+ */
projects / tcpdump / blobdiff