diff options
Diffstat (limited to 'freebsd/contrib/tcpdump/print-sl.c')
| -rw-r--r-- | freebsd/contrib/tcpdump/print-sl.c | 34 |
1 files changed, 24 insertions, 10 deletions
diff --git a/freebsd/contrib/tcpdump/print-sl.c b/freebsd/contrib/tcpdump/print-sl.c index faaa5ba7..609f0950 100644 --- a/freebsd/contrib/tcpdump/print-sl.c +++ b/freebsd/contrib/tcpdump/print-sl.c @@ -58,8 +58,8 @@ 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, @@ -80,7 +80,10 @@ 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((ndo, "%s", tstr)); + return (caplen + SLIP_HDRLEN); + } if (caplen < 1 || length < 1) { ND_PRINT((ndo, "%s", tstr)); @@ -128,7 +131,7 @@ sl_bsdos_if_print(netdissect_options *ndo, return (SLIP_HDRLEN); } -static void +static int sliplink_print(netdissect_options *ndo, register const u_char *p, register const struct ip *ip, register u_int length) @@ -159,7 +162,7 @@ sliplink_print(netdissect_options *ndo, for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i) ND_PRINT((ndo, "%02x.", p[i])); ND_PRINT((ndo, "%02x: ", p[SLX_CHDR + CHDR_LEN - 1])); - return; + return 0; } switch (p[SLX_CHDR] & 0xf0) { @@ -177,9 +180,11 @@ sliplink_print(netdissect_options *ndo, ND_PRINT((ndo, "utcp %d: ", lastconn)); if (dir == -1) { /* Direction is bogus, don't use it */ - return; + return 0; } + ND_TCHECK(*ip); hlen = IP_HL(ip); + ND_TCHECK(*((const struct tcphdr *)&((const int *)ip)[hlen])); hlen += TH_OFF((const struct tcphdr *)&((const int *)ip)[hlen]); lastlen[dir][lastconn] = length - (hlen << 2); break; @@ -187,15 +192,19 @@ sliplink_print(netdissect_options *ndo, default: if (dir == -1) { /* Direction is bogus, don't use it */ - return; + return 0; } if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) { - compressed_sl_print(ndo, &p[SLX_CHDR], ip, - length, dir); + if (compressed_sl_print(ndo, &p[SLX_CHDR], ip, + length, dir) == -1) + goto trunc; ND_PRINT((ndo, ": ")); } else ND_PRINT((ndo, "slip-%d!: ", p[SLX_CHDR])); } + return 0; +trunc: + return -1; } static const u_char * @@ -229,7 +238,7 @@ 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) @@ -275,10 +284,15 @@ 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(*ip); hlen = IP_HL(ip); + ND_TCHECK(*((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((ndo, " %d (%ld)", lastlen[dir][lastconn], (long)(cp - chdr))); + return 0; +trunc: + return -1; } #ifdef __rtems__ #include "rtems-bsd-tcpdump-print-sl-data.h" |