]> The Tcpdump Group git mirrors - tcpdump/blobdiff - print-sl.c
projects / tcpdump / blobdiff
summary | shortlog | log | commit | commitdiff | tree
raw | inline | side by side
gre: add support for MikroTik Ethernet-over-IP hack.
[tcpdump] / print-sl.c
diff --git a/print-sl.c b/print-sl.c
index 9f2858a01b046e8646837ade659a504ef926201e..88f9fb0291e10fe48b32cac3cfecd89097477cba 100644 (file)
--- a/print-sl.c
+++ b/print-sl.c
@@ -19,173 +19,122 @@
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
-#ifndef lint
-static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-sl.c,v 1.47 2000-07-01 03:39:09 assar Exp $ (LBL)";
-#endif
+/* \summary: Compressed Serial Line Internet Protocol printer */
 
 #ifdef HAVE_CONFIG_H
 
 #ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
 #endif
 
 #endif
 
-#ifdef HAVE_NET_SLIP_H
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/timeb.h>
-#include <sys/file.h>
-#include <sys/ioctl.h>
-#include <sys/mbuf.h>
-#include <sys/socket.h>
-
-struct mbuf;
-struct rtentry;
-#include <net/if.h>
-
-#include <netinet/in.h>
-#include <netinet/in_systm.h>
-#include <netinet/ip.h>
-#include <netinet/if_ether.h>
-#include <netinet/udp.h>
-#include <netinet/tcp.h>
-
-#include <net/slcompress.h>
-#include <net/slip.h>
-
-#include <ctype.h>
-#include <netdb.h>
-#include <pcap.h>
-#include <stdio.h>
-
-#include "interface.h"
-#include "addrtoname.h"
-#include "extract.h"                   /* must come after interface.h */
+#include "netdissect-stdinc.h"
 
 
-static u_int lastlen[2][256];
-static u_int lastconn = 255;
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "extract.h"
 
 
-static void sliplink_print(const u_char *, const struct ip *, u_int);
-static void compressed_sl_print(const u_char *, const struct ip *, u_int, int);
+#include "ip.h"
+#include "tcp.h"
+#include "slcompress.h"
+
+/*
+ * definitions of the pseudo- link-level header attached to slip
+ * packets grabbed by the packet filter (bpf) traffic monitor.
+ */
+#define SLIP_HDRLEN 16
 
 
-/* XXX BSD/OS 2.1 compatibility */
-#if !defined(SLIP_HDRLEN) && defined(SLC_BPFHDR)
-#define SLIP_HDRLEN SLC_BPFHDR
 #define SLX_DIR 0
 #define SLX_DIR 0
-#define SLX_CHDR (SLC_BPFHDRLEN - 1)
-#define CHDR_LEN (SLC_BPFHDR - SLC_BPFHDRLEN)
-#endif
+#define SLX_CHDR 1
+
+#define SLIPDIR_IN 0
+#define SLIPDIR_OUT 1
+
 
 
-/* XXX needs more hacking to work right */
+static u_int lastlen[2][256];
+static u_int lastconn = 255;
+
+static void sliplink_print(netdissect_options *, const u_char *, const struct ip *, u_int);
+static void compressed_sl_print(netdissect_options *, const u_char *, const struct ip *, u_int, int);
 
 void
 
 void
-sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
+sl_if_print(netdissect_options *ndo,
+            const struct pcap_pkthdr *h, const u_char *p)
 {
 {
-       register u_int caplen = h->caplen;
-       register u_int length = h->len;
-       register const struct ip *ip;
-
-       ts_print(&h->ts);
+       u_int length = h->len;
+       const struct ip *ip;
 
 
-       if (caplen < SLIP_HDRLEN) {
-               printf("[|slip]");
-               goto out;
-       }
-       /*
-        * Some printers want to get back at the link level 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;
+       ndo->ndo_protocol = "slip";
+       ND_TCHECK_LEN(p, SLIP_HDRLEN);
+       ndo->ndo_ll_hdr_len += SLIP_HDRLEN;
 
        length -= SLIP_HDRLEN;
 
 
        length -= SLIP_HDRLEN;
 
-       ip = (struct ip *)(p + SLIP_HDRLEN);
+       ip = (const struct ip *)(p + SLIP_HDRLEN);
 
 
-       if (eflag)
-               sliplink_print(p, ip, length);
+       if (ndo->ndo_eflag)
+               sliplink_print(ndo, p, ip, length);
 
 
-       switch (ip->ip_v) {
+       switch (IP_V(ip)) {
        case 4:
        case 4:
-               ip_print((u_char *)ip, length);
+               ip_print(ndo, (const u_char *)ip, length);
                break;
                break;
-#ifdef INET6
        case 6:
        case 6:
-               ip6_print((u_char *)ip, length);
+               ip6_print(ndo, (const u_char *)ip, length);
                break;
                break;
-#endif
        default:
        default:
-               printf ("ip v%d", ip->ip_v);
+               ND_PRINT("ip v%u", IP_V(ip));
        }
        }
-
-       if (xflag)
-               default_print((u_char *)ip, caplen - SLIP_HDRLEN);
- out:
-       putchar('\n');
 }
 
 }
 
-
 void
 void
-sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
+sl_bsdos_if_print(netdissect_options *ndo,
+                  const struct pcap_pkthdr *h, const u_char *p)
 {
 {
-       register u_int caplen = h->caplen;
-       register u_int length = h->len;
-       register const struct ip *ip;
+       u_int length = h->len;
+       const struct ip *ip;
 
 
-       ts_print(&h->ts);
-
-       if (caplen < SLIP_HDRLEN) {
-               printf("[|slip]");
-               goto out;
-       }
-       /*
-        * Some printers want to get back at the link level 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;
+       ndo->ndo_protocol = "slip_bsdos";
+       ND_TCHECK_LEN(p, SLIP_HDRLEN);
+       ndo->ndo_ll_hdr_len += SLIP_HDRLEN;
 
        length -= SLIP_HDRLEN;
 
 
        length -= SLIP_HDRLEN;
 
-       ip = (struct ip *)(p + SLIP_HDRLEN);
+       ip = (const struct ip *)(p + SLIP_HDRLEN);
 
 #ifdef notdef
 
 #ifdef notdef
-       if (eflag)
-               sliplink_print(p, ip, length);
+       if (ndo->ndo_eflag)
+               sliplink_print(ndo, p, ip, length);
 #endif
 
 #endif
 
-       ip_print((u_char *)ip, length);
-
-       if (xflag)
-               default_print((u_char *)ip, caplen - SLIP_HDRLEN);
- out:
-       putchar('\n');
+       ip_print(ndo, (const u_char *)ip, length);
 }
 
 static void
 }
 
 static void
-sliplink_print(register const u_char *p, register const struct ip *ip,
-              register u_int length)
+sliplink_print(netdissect_options *ndo,
+               const u_char *p, const struct ip *ip,
+               u_int length)
 {
        int dir;
        u_int hlen;
 
 {
        int dir;
        u_int hlen;
 
-       dir = p[SLX_DIR];
-       putchar(dir == SLIPDIR_IN ? 'I' : 'O');
-       putchar(' ');
+       dir = GET_U_1(p + SLX_DIR);
+       switch (dir) {
 
 
-       if (nflag) {
-               /* XXX just dump the header */
-               register int i;
+       case SLIPDIR_IN:
+               ND_PRINT("I ");
+               break;
+
+       case SLIPDIR_OUT:
+               ND_PRINT("O ");
+               break;
 
 
-               for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i)
-                       printf("%02x.", p[i]);
-               printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]);
-               return;
+       default:
+               ND_PRINT("Invalid direction %d ", dir);
+               dir = -1;
+               break;
        }
        }
-       switch (p[SLX_CHDR] & 0xf0) {
+       switch (GET_U_1(p + SLX_CHDR) & 0xf0) {
 
        case TYPE_IP:
 
        case TYPE_IP:
-               printf("ip %d: ", length + SLIP_HDRLEN);
+               ND_PRINT("ip %u: ", length + SLIP_HDRLEN);
                break;
 
        case TYPE_UNCOMPRESSED_TCP:
                break;
 
        case TYPE_UNCOMPRESSED_TCP:
@@ -194,124 +143,113 @@ sliplink_print(register const u_char *p, register const struct ip *ip,
                 * Get it from the link layer since sl_uncompress_tcp()
                 * has restored the IP header copy to IPPROTO_TCP.
                 */
                 * Get it from the link layer since sl_uncompress_tcp()
                 * has restored the IP header copy to IPPROTO_TCP.
                 */
-               lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p;
-               hlen = ip->ip_hl;
-               hlen += ((struct tcphdr *)&((int *)ip)[hlen])->th_off;
+               lastconn = GET_U_1(((const struct ip *)(p + SLX_CHDR))->ip_p);
+               ND_PRINT("utcp %u: ", lastconn);
+               if (dir == -1) {
+                       /* Direction is bogus, don't use it */
+                       return;
+               }
+               hlen = IP_HL(ip);
+               hlen += TH_OFF((const struct tcphdr *)&((const int *)ip)[hlen]);
                lastlen[dir][lastconn] = length - (hlen << 2);
                lastlen[dir][lastconn] = length - (hlen << 2);
-               printf("utcp %d: ", lastconn);
                break;
 
        default:
                break;
 
        default:
-               if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) {
-                       compressed_sl_print(&p[SLX_CHDR], ip,
-                           length, dir);
-                       printf(": ");
+               if (dir == -1) {
+                       /* Direction is bogus, don't use it */
+                       return;
+               }
+               if (GET_U_1(p + SLX_CHDR) & TYPE_COMPRESSED_TCP) {
+                       compressed_sl_print(ndo, p + SLX_CHDR, ip, length, dir);
+                       ND_PRINT(": ");
                } else
                } else
-                       printf("slip-%d!: ", p[SLX_CHDR]);
+                       ND_PRINT("slip-%u!: ", GET_U_1(p + SLX_CHDR));
        }
 }
 
 static const u_char *
        }
 }
 
 static const u_char *
-print_sl_change(const char *str, register const u_char *cp)
+print_sl_change(netdissect_options *ndo,
+                const char *str, const u_char *cp)
 {
 {
-       register u_int i;
+       u_int i;
 
 
-       if ((i = *cp++) == 0) {
-               i = EXTRACT_16BITS(cp);
+       if ((i = GET_U_1(cp)) == 0) {
+               cp++;
+               i = GET_BE_U_2(cp);
                cp += 2;
        }
                cp += 2;
        }
-       printf(" %s%d", str, i);
+       ND_PRINT(" %s%u", str, i);
        return (cp);
 }
 
 static const u_char *
        return (cp);
 }
 
 static const u_char *
-print_sl_winchange(register const u_char *cp)
+print_sl_winchange(netdissect_options *ndo,
+                   const u_char *cp)
 {
 {
-       register short i;
+       int16_t i;
 
 
-       if ((i = *cp++) == 0) {
-               i = EXTRACT_16BITS(cp);
+       if ((i = GET_U_1(cp)) == 0) {
+               cp++;
+               i = GET_BE_S_2(cp);
                cp += 2;
        }
        if (i >= 0)
                cp += 2;
        }
        if (i >= 0)
-               printf(" W+%d", i);
+               ND_PRINT(" W+%d", i);
        else
        else
-               printf(" W%d", i);
+               ND_PRINT(" W%d", i);
        return (cp);
 }
 
 static void
        return (cp);
 }
 
 static void
-compressed_sl_print(const u_char *chdr, const struct ip *ip,
-                   u_int length, int dir)
+compressed_sl_print(netdissect_options *ndo,
+                    const u_char *chdr, const struct ip *ip,
+                    u_int length, int dir)
 {
 {
-       register const u_char *cp = chdr;
-       register u_int flags, hlen;
+       const u_char *cp = chdr;
+       u_int flags, hlen;
 
 
-       flags = *cp++;
+       flags = GET_U_1(cp);
+       cp++;
        if (flags & NEW_C) {
        if (flags & NEW_C) {
-               lastconn = *cp++;
-               printf("ctcp %d", lastconn);
+               lastconn = GET_U_1(cp);
+               cp++;
+               ND_PRINT("ctcp %u", lastconn);
        } else
        } else
-               printf("ctcp *");
+               ND_PRINT("ctcp *");
 
        /* skip tcp checksum */
        cp += 2;
 
        switch (flags & SPECIALS_MASK) {
        case SPECIAL_I:
 
        /* skip tcp checksum */
        cp += 2;
 
        switch (flags & SPECIALS_MASK) {
        case SPECIAL_I:
-               printf(" *SA+%d", lastlen[dir][lastconn]);
+               ND_PRINT(" *SA+%u", lastlen[dir][lastconn]);
                break;
 
        case SPECIAL_D:
                break;
 
        case SPECIAL_D:
-               printf(" *S+%d", lastlen[dir][lastconn]);
+               ND_PRINT(" *S+%u", lastlen[dir][lastconn]);
                break;
 
        default:
                if (flags & NEW_U)
                break;
 
        default:
                if (flags & NEW_U)
-                       cp = print_sl_change("U=", cp);
+                       cp = print_sl_change(ndo, "U=", cp);
                if (flags & NEW_W)
                if (flags & NEW_W)
-                       cp = print_sl_winchange(cp);
+                       cp = print_sl_winchange(ndo, cp);
                if (flags & NEW_A)
                if (flags & NEW_A)
-                       cp = print_sl_change("A+", cp);
+                       cp = print_sl_change(ndo, "A+", cp);
                if (flags & NEW_S)
                if (flags & NEW_S)
-                       cp = print_sl_change("S+", cp);
+                       cp = print_sl_change(ndo, "S+", cp);
                break;
        }
        if (flags & NEW_I)
                break;
        }
        if (flags & NEW_I)
-               cp = print_sl_change("I+", cp);
+               cp = print_sl_change(ndo, "I+", cp);
 
        /*
         * 'hlen' is the length of the uncompressed TCP/IP header (in words).
         * 'cp - chdr' is the length of the compressed header.
         * 'length - hlen' is the amount of data in the packet.
         */
 
        /*
         * 'hlen' is the length of the uncompressed TCP/IP header (in words).
         * 'cp - chdr' is the length of the compressed header.
         * 'length - hlen' is the amount of data in the packet.
         */
-       hlen = ip->ip_hl;
-       hlen += ((struct tcphdr *)&((int32_t *)ip)[hlen])->th_off;
+       hlen = IP_HL(ip);
+       hlen += TH_OFF((const struct tcphdr *)&((const int32_t *)ip)[hlen]);
        lastlen[dir][lastconn] = length - (hlen << 2);
        lastlen[dir][lastconn] = length - (hlen << 2);
-       printf(" %d (%d)", lastlen[dir][lastconn], cp - chdr);
+       ND_PRINT(" %u (%ld)", lastlen[dir][lastconn], (long)(cp - chdr));
 }
 }
-#else
-#include <sys/types.h>
-#include <sys/time.h>
-
-#include <pcap.h>
-#include <stdio.h>
-
-#include "interface.h"
-
-void
-sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
-{
-
-       error("not configured for slip");
-       /* NOTREACHED */
-}
-
-void
-sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
-{
-
-       error("not configured for slip");
-       /* NOTREACHED */
-}
-#endif
[mirror] the TCPdump network dissector