diff options
Diffstat (limited to 'print-sl.c')
| -rw-r--r-- | print-sl.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/print-sl.c b/print-sl.c index 3fd7e898dee5..a02077b3773d 100644 --- a/print-sl.c +++ b/print-sl.c @@ -131,8 +131,21 @@ sliplink_print(netdissect_options *ndo, u_int hlen; dir = p[SLX_DIR]; - ND_PRINT((ndo, dir == SLIPDIR_IN ? "I " : "O ")); + switch (dir) { + case SLIPDIR_IN: + ND_PRINT((ndo, "I ")); + break; + + case SLIPDIR_OUT: + ND_PRINT((ndo, "O ")); + break; + + default: + ND_PRINT((ndo, "Invalid direction %d ", dir)); + dir = -1; + break; + } if (ndo->ndo_nflag) { /* XXX just dump the header */ register int i; @@ -155,13 +168,21 @@ sliplink_print(netdissect_options *ndo, * has restored the IP header copy to IPPROTO_TCP. */ lastconn = ((const struct ip *)&p[SLX_CHDR])->ip_p; + ND_PRINT((ndo, "utcp %d: ", 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); - ND_PRINT((ndo, "utcp %d: ", lastconn)); break; default: + if (dir == -1) { + /* Direction is bogus, don't use it */ + return; + } if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) { compressed_sl_print(ndo, &p[SLX_CHDR], ip, length, dir); |