+
+trunc:
+ printf("[|bacp]");
+ return 0;
+}
+
+
+static void
+ppp_hdlc(const u_char *p, int length)
+{
+ u_char *b, *s, *t, c;
+ int i, proto;
+ const void *se;
+
+ b = (u_int8_t *)malloc(length);
+ if (b == NULL)
+ return;
+
+ /*
+ * Unescape all the data into a temporary, private, buffer.
+ * Do this so that we dont overwrite the original packet
+ * contents.
+ */
+ for (s = (u_char *)p, t = b, i = length; i > 0; i--) {
+ c = *s++;
+ if (c == 0x7d) {
+ if (i > 1) {
+ i--;
+ c = *s++ ^ 0x20;
+ } else
+ continue;
+ }
+ *t++ = c;
+ }
+
+ se = snapend;
+ snapend = t;
+
+ /* now lets guess about the payload codepoint format */
+ proto = *b; /* start with a one-octet codepoint guess */
+
+ switch (proto) {
+ case PPP_IP:
+ ip_print(b+1, t - b - 1);
+ goto cleanup;
+#ifdef INET6
+ case PPP_IPV6:
+ ip6_print(b+1, t - b - 1);
+ goto cleanup;
+#endif
+ default: /* no luck - try next guess */
+ break;
+ }
+
+ proto = EXTRACT_16BITS(b); /* next guess - load two octets */
+
+ switch (proto) {
+ case 0xff03: /* looks like a PPP frame */
+ proto = EXTRACT_16BITS(b+2); /* load the PPP proto-id */
+ handle_ppp(proto, b+4, t - b - 4);
+ break;
+ default: /* last guess - proto must be a PPP proto-id */
+ handle_ppp(proto, b+2, t - b - 2);
+ break;
+ }
+
+cleanup:
+ snapend = se;
+ free(b);
+ return;
projects / tcpdump / blobdiff