+ /*
+ * XXX - of course this is wrong, because buf is a const buffer,
+ * but changing this would require a more complicated fix.
+ */
+ memcpy(buf, output_buffer, len);
+ free(output_buffer);
+
+ ndo->ndo_packetp = buf;
+ ndo->ndo_snapend = end;
+
+ return 1;
+}
+USES_APPLE_RST
+
+static void esp_print_addsa(netdissect_options *ndo,
+ struct sa_list *sa, int sa_def)
+{
+ /* copy the "sa" */
+
+ struct sa_list *nsa;
+
+ nsa = (struct sa_list *)malloc(sizeof(struct sa_list));
+ if (nsa == NULL)
+ (*ndo->ndo_error)(ndo, "ran out of memory to allocate sa structure");
+
+ *nsa = *sa;
+
+ if (sa_def)
+ ndo->ndo_sa_default = nsa;
+
+ nsa->next = ndo->ndo_sa_list_head;
+ ndo->ndo_sa_list_head = nsa;
+}
+
+
+static u_int hexdigit(netdissect_options *ndo, char hex)
+{
+ if (hex >= '0' && hex <= '9')
+ return (hex - '0');
+ else if (hex >= 'A' && hex <= 'F')
+ return (hex - 'A' + 10);
+ else if (hex >= 'a' && hex <= 'f')
+ return (hex - 'a' + 10);
+ else {
+ (*ndo->ndo_error)(ndo, "invalid hex digit %c in espsecret\n", hex);
+ return 0;
+ }
+}
+
+static u_int hex2byte(netdissect_options *ndo, char *hexstring)
+{
+ u_int byte;
+
+ byte = (hexdigit(ndo, hexstring[0]) << 4) + hexdigit(ndo, hexstring[1]);
+ return byte;
+}
+
+/*
+ * returns size of binary, 0 on failure.
+ */
+static
+int espprint_decode_hex(netdissect_options *ndo,
+ u_char *binbuf, unsigned int binbuf_len,
+ char *hex)
+{
+ unsigned int len;
+ int i;
+
+ len = strlen(hex) / 2;
+
+ if (len > binbuf_len) {
+ (*ndo->ndo_warning)(ndo, "secret is too big: %d\n", len);
+ return 0;
+ }
+
+ i = 0;
+ while (hex[0] != '\0' && hex[1]!='\0') {
+ binbuf[i] = hex2byte(ndo, hex);
+ hex += 2;
+ i++;
+ }
+
+ return i;
+}
+
+/*
+ * decode the form: SPINUM@IP <tab> ALGONAME:0xsecret
+ */
+
+USES_APPLE_DEPRECATED_API
+static int
+espprint_decode_encalgo(netdissect_options *ndo,
+ char *decode, struct sa_list *sa)
+{
+ size_t i;
+ const EVP_CIPHER *evp;
+ int authlen = 0;
+ char *colon, *p;
+
+ colon = strchr(decode, ':');
+ if (colon == NULL) {
+ (*ndo->ndo_warning)(ndo, "failed to decode espsecret: %s\n", decode);
+ return 0;
+ }
+ *colon = '\0';
+
+ if (strlen(decode) > strlen("-hmac96") &&
+ !strcmp(decode + strlen(decode) - strlen("-hmac96"),
+ "-hmac96")) {
+ p = strstr(decode, "-hmac96");
+ *p = '\0';
+ authlen = 12;
+ }
+ if (strlen(decode) > strlen("-cbc") &&
+ !strcmp(decode + strlen(decode) - strlen("-cbc"), "-cbc")) {
+ p = strstr(decode, "-cbc");
+ *p = '\0';
+ }
+ evp = EVP_get_cipherbyname(decode);
+
+ if (!evp) {
+ (*ndo->ndo_warning)(ndo, "failed to find cipher algo %s\n", decode);
+ sa->evp = NULL;
+ sa->authlen = 0;
+ sa->ivlen = 0;
+ return 0;
+ }
+
+ sa->evp = evp;
+ sa->authlen = authlen;
+ sa->ivlen = EVP_CIPHER_iv_length(evp);
projects / tcpdump / blobdiff