| /* |
| * Marko Kiiskila carnil@cs.tut.fi |
| * |
| * Tampere University of Technology - Telecommunications Laboratory |
| * |
| * Permission to use, copy, modify and distribute this |
| * software and its documentation is hereby granted, |
| * provided that both the copyright notice and this |
| * permission notice appear in all copies of the software, |
| * derivative works or modified versions, and any portions |
| * thereof, that both notices appear in supporting |
| * 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 |
| |
| #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 <net/if.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 "addrtoname.h" |
| |
| const u_char *packetp; |
| const u_char *snapend; |
| |
| #define RFC1483LLC_LEN 8 |
| |
| static unsigned char rfcllc[] = { |
| 0xaa, /* DSAP: non-ISO */ |
| 0xaa, /* SSAP: non-ISO */ |
| 0x03, /* Ctrl: Unnumbered Information Command PDU */ |
| 0x00, /* OUI: EtherType */ |
| 0x00, |
| 0x00 }; |
| |
| static inline void |
| cip_print(register const u_char *bp, 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); |
| } |
| } |
| } |
| |
| /* |
| * 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' |
| * is the number of bytes actually captured. |
| */ |
| void |
| cip_if_print(u_char *user, 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; |
| } |
| |
| 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]); |
| } else { |
| ether_type = ETHERTYPE_IP; |
| bp = (u_short *)p; |
| } |
| |
| /* |
| * 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'); |
| } |