Add printing support for vsockmon devices.

[tcpdump] / print-sl.c

diff --git a/print-sl.c b/print-sl.c
index 2aad552f2798a67de7d4450b3115413876632a0a..14f9bc1b607736bbaa6647d494cf16f6ac138771 100644 (file)
--- a/print-sl.c
+++ b/print-sl.c
@@ -47,13 +47,12 @@
 #define SLIPDIR_IN 0
 #define SLIPDIR_OUT 1
 
-static const char tstr[] = "[|slip]";
 
 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);
+static int sliplink_print(netdissect_options *, const u_char *, const struct ip *, u_int);
+static int compressed_sl_print(netdissect_options *, const u_char *, const struct ip *, u_int, int);
 
 u_int
 sl_if_print(netdissect_options *ndo,
@@ -63,8 +62,9 @@ sl_if_print(netdissect_options *ndo,
        u_int length = h->len;
        const struct ip *ip;
 
-       if (caplen < SLIP_HDRLEN || length < SLIP_HDRLEN) {
-               ND_PRINT("%s", tstr);
+       ndo->ndo_protocol = "sl_if";
+       if (caplen < SLIP_HDRLEN) {
+               nd_print_trunc(ndo);
                return (caplen);
        }
 
@@ -74,10 +74,13 @@ sl_if_print(netdissect_options *ndo,
        ip = (const struct ip *)(p + SLIP_HDRLEN);
 
        if (ndo->ndo_eflag)
-               sliplink_print(ndo, p, ip, length);
+               if (sliplink_print(ndo, p, ip, length) == -1) {
+                       nd_print_trunc(ndo);
+                       return (caplen + SLIP_HDRLEN);
+               }
 
-       if (caplen < 1 || length < 1) {
-               ND_PRINT("%s", tstr);
+       if (caplen < 1) {
+               nd_print_trunc(ndo);
                return (caplen + SLIP_HDRLEN);
        }
 
@@ -103,8 +106,9 @@ sl_bsdos_if_print(netdissect_options *ndo,
        u_int length = h->len;
        const struct ip *ip;
 
+       ndo->ndo_protocol = "sl_bsdos_if";
        if (caplen < SLIP_HDRLEN) {
-               ND_PRINT("%s", tstr);
+               nd_print_trunc(ndo);
                return (caplen);
        }
 
@@ -122,7 +126,7 @@ sl_bsdos_if_print(netdissect_options *ndo,
        return (SLIP_HDRLEN);
 }
 
-static void
+static int
 sliplink_print(netdissect_options *ndo,
                const u_char *p, const struct ip *ip,
                u_int length)
@@ -130,7 +134,7 @@ sliplink_print(netdissect_options *ndo,
        int dir;
        u_int hlen;
 
-       dir = EXTRACT_U_1(p + SLX_DIR);
+       dir = GET_U_1(p + SLX_DIR);
        switch (dir) {
 
        case SLIPDIR_IN:
@@ -146,16 +150,7 @@ sliplink_print(netdissect_options *ndo,
                dir = -1;
                break;
        }
-       if (ndo->ndo_nflag) {
-               /* XXX just dump the header */
-               int i;
-
-               for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i)
-                       ND_PRINT("%02x.", EXTRACT_U_1(p + i));
-               ND_PRINT("%02x: ", EXTRACT_U_1(p + SLX_CHDR + CHDR_LEN - 1));
-               return;
-       }
-       switch (EXTRACT_U_1(p + SLX_CHDR) & 0xf0) {
+       switch (GET_U_1(p + SLX_CHDR) & 0xf0) {
 
        case TYPE_IP:
                ND_PRINT("ip %u: ", length + SLIP_HDRLEN);
@@ -167,13 +162,15 @@ sliplink_print(netdissect_options *ndo,
                 * Get it from the link layer since sl_uncompress_tcp()
                 * has restored the IP header copy to IPPROTO_TCP.
                 */
-               lastconn = EXTRACT_U_1(((const struct ip *)(p + SLX_CHDR))->ip_p);
+               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;
+                       return 0;
                }
+               ND_TCHECK_SIZE(ip);
                hlen = IP_HL(ip);
+               ND_TCHECK_SIZE((const struct tcphdr *)&((const int *)ip)[hlen]);
                hlen += TH_OFF((const struct tcphdr *)&((const int *)ip)[hlen]);
                lastlen[dir][lastconn] = length - (hlen << 2);
                break;
@@ -181,15 +178,19 @@ sliplink_print(netdissect_options *ndo,
        default:
                if (dir == -1) {
                        /* Direction is bogus, don't use it */
-                       return;
+                       return 0;
                }
-               if (EXTRACT_U_1(p + SLX_CHDR) & TYPE_COMPRESSED_TCP) {
-                       compressed_sl_print(ndo, p + SLX_CHDR, ip,
-                                           length, dir);
+               if (GET_U_1(p + SLX_CHDR) & TYPE_COMPRESSED_TCP) {
+                       if (compressed_sl_print(ndo, p + SLX_CHDR, ip,
+                                               length, dir) == -1)
+                               goto trunc;
                        ND_PRINT(": ");
                } else
-                       ND_PRINT("slip-%u!: ", EXTRACT_U_1(p + SLX_CHDR));
+                       ND_PRINT("slip-%u!: ", GET_U_1(p + SLX_CHDR));
        }
+       return 0;
+trunc:
+       return -1;
 }
 
 static const u_char *
@@ -198,9 +199,9 @@ print_sl_change(netdissect_options *ndo,
 {
        u_int i;
 
-       if ((i = EXTRACT_U_1(cp)) == 0) {
+       if ((i = GET_U_1(cp)) == 0) {
                cp++;
-               i = EXTRACT_BE_U_2(cp);
+               i = GET_BE_U_2(cp);
                cp += 2;
        }
        ND_PRINT(" %s%u", str, i);
@@ -213,9 +214,9 @@ print_sl_winchange(netdissect_options *ndo,
 {
        int16_t i;
 
-       if ((i = EXTRACT_U_1(cp)) == 0) {
+       if ((i = GET_U_1(cp)) == 0) {
                cp++;
-               i = EXTRACT_BE_S_2(cp);
+               i = GET_BE_S_2(cp);
                cp += 2;
        }
        if (i >= 0)
@@ -225,7 +226,7 @@ print_sl_winchange(netdissect_options *ndo,
        return (cp);
 }
 
-static void
+static int
 compressed_sl_print(netdissect_options *ndo,
                     const u_char *chdr, const struct ip *ip,
                     u_int length, int dir)
@@ -233,10 +234,10 @@ compressed_sl_print(netdissect_options *ndo,
        const u_char *cp = chdr;
        u_int flags, hlen;
 
-       flags = EXTRACT_U_1(cp);
+       flags = GET_U_1(cp);
        cp++;
        if (flags & NEW_C) {
-               lastconn = EXTRACT_U_1(cp);
+               lastconn = GET_U_1(cp);
                cp++;
                ND_PRINT("ctcp %u", lastconn);
        } else
@@ -273,8 +274,13 @@ compressed_sl_print(netdissect_options *ndo,
         * 'cp - chdr' is the length of the compressed header.
         * 'length - hlen' is the amount of data in the packet.
         */
+       ND_TCHECK_SIZE(ip);
        hlen = IP_HL(ip);
+       ND_TCHECK_SIZE((const struct tcphdr *)&((const int32_t *)ip)[hlen]);
        hlen += TH_OFF((const struct tcphdr *)&((const int32_t *)ip)[hlen]);
        lastlen[dir][lastconn] = length - (hlen << 2);
        ND_PRINT(" %u (%ld)", lastlen[dir][lastconn], (long)(cp - chdr));
+       return 0;
+trunc:
+       return -1;
 }