gre: add support for MikroTik Ethernet-over-IP hack.

[tcpdump] / print-esp.c

diff --git a/print-esp.c b/print-esp.c
index 61c3e13bffdae2da778ca29f5732f5929a22aaff..2cee08893a12a4f9d180e270c23733d5efa03fe9 100644 (file)
--- a/print-esp.c
+++ b/print-esp.c
@@ -47,6 +47,8 @@
 #include "netdissect.h"
 #include "extract.h"
 
+#include "diag-control.h"
+
 #ifdef HAVE_LIBCRYPTO
 #include "strtoaddr.h"
 #include "ascii_strcasecmp.h"
@@ -236,7 +238,7 @@ do_decrypt(netdissect_options *ndo, const char *caller, struct sa_list *sa,
         * we can't decrypt on top of the input buffer.
         */
        ptlen = ctlen;
-       pt = (u_char *)malloc(ptlen);
+       pt = (u_char *)calloc(1, ptlen);
        if (pt == NULL) {
                EVP_CIPHER_CTX_free(ctx);
                (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
@@ -278,7 +280,7 @@ do_decrypt(netdissect_options *ndo, const char *caller, struct sa_list *sa,
  * dissecting anything in it and before it does any dissection of
  * anything in the old buffer.  That will free the new buffer.
  */
-USES_APPLE_DEPRECATED_API
+DIAG_OFF_DEPRECATION
 int esp_decrypt_buffer_by_ikev2_print(netdissect_options *ndo,
                                      int initiator,
                                      const u_char spii[8],
@@ -317,7 +319,7 @@ int esp_decrypt_buffer_by_ikev2_print(netdissect_options *ndo,
 
        if(end <= ct) return 0;
 
-       pt = do_decrypt(ndo, "esp_decrypt_buffer_by_ikev2_print", sa, iv,
+       pt = do_decrypt(ndo, __func__, sa, iv,
            ct, ctlen);
        if (pt == NULL)
                return 0;
@@ -327,17 +329,18 @@ int esp_decrypt_buffer_by_ikev2_print(netdissect_options *ndo,
         * on the buffer stack so it can be freed; our caller must
         * pop it when done.
         */
-       if (!nd_push_buffer(ndo, pt, pt, pt + ctlen)) {
+       if (!nd_push_buffer(ndo, pt, pt, ctlen)) {
                free(pt);
-               return 0;
+               (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
+                       "%s: can't push buffer on buffer stack", __func__);
        }
 
        return 1;
 }
-USES_APPLE_RST
+DIAG_ON_DEPRECATION
 
 static void esp_print_addsa(netdissect_options *ndo,
-                           struct sa_list *sa, int sa_def)
+                           const struct sa_list *sa, int sa_def)
 {
        /* copy the "sa" */
 
@@ -384,10 +387,9 @@ static u_int hex2byte(netdissect_options *ndo, char *hexstring)
 /*
  * returns size of binary, 0 on failure.
  */
-static
-int espprint_decode_hex(netdissect_options *ndo,
-                       u_char *binbuf, unsigned int binbuf_len,
-                       char *hex)
+static int
+espprint_decode_hex(netdissect_options *ndo,
+                   u_char *binbuf, unsigned int binbuf_len, char *hex)
 {
        unsigned int len;
        int i;
@@ -413,7 +415,7 @@ int espprint_decode_hex(netdissect_options *ndo,
  * decode the form:    SPINUM@IP <tab> ALGONAME:0xsecret
  */
 
-USES_APPLE_DEPRECATED_API
+DIAG_OFF_DEPRECATION
 static int
 espprint_decode_encalgo(netdissect_options *ndo,
                        char *decode, struct sa_list *sa)
@@ -478,7 +480,7 @@ espprint_decode_encalgo(netdissect_options *ndo,
 
        return 1;
 }
-USES_APPLE_RST
+DIAG_ON_DEPRECATION
 
 /*
  * for the moment, ignore the auth algorithm, just hard code the authenticator
@@ -670,7 +672,7 @@ static void esp_print_decode_onesecret(netdissect_options *ndo, char *line,
        esp_print_addsa(ndo, &sa1, sa_def);
 }
 
-USES_APPLE_DEPRECATED_API
+DIAG_OFF_DEPRECATION
 static void esp_init(netdissect_options *ndo _U_)
 {
        /*
@@ -683,7 +685,7 @@ static void esp_init(netdissect_options *ndo _U_)
 #endif
        EVP_add_cipher_alias(SN_des_ede3_cbc, "3des");
 }
-USES_APPLE_RST
+DIAG_ON_DEPRECATION
 
 void esp_decodesecret_print(netdissect_options *ndo)
 {
@@ -720,7 +722,7 @@ void esp_decodesecret_print(netdissect_options *ndo)
 #endif
 
 #ifdef HAVE_LIBCRYPTO
-USES_APPLE_DEPRECATED_API
+DIAG_OFF_DEPRECATION
 #endif
 void
 esp_print(netdissect_options *ndo,
@@ -760,7 +762,7 @@ esp_print(netdissect_options *ndo,
        ND_PRINT(", length %u", length);
 
 #ifdef HAVE_LIBCRYPTO
-       /* initiailize SAs */
+       /* initialize SAs */
        if (ndo->ndo_sa_list_head == NULL) {
                if (!ndo->ndo_espsecret)
                        return;
@@ -868,7 +870,7 @@ esp_print(netdissect_options *ndo,
                return;
        }
 
-       pt = do_decrypt(ndo, "esp_print", sa, iv, ct, payloadlen);
+       pt = do_decrypt(ndo, __func__, sa, iv, ct, payloadlen);
        if (pt == NULL)
                return;
 
@@ -876,8 +878,7 @@ esp_print(netdissect_options *ndo,
         * Switch to the output buffer for dissection, and
         * save it on the buffer stack so it can be freed.
         */
-       ep = pt + payloadlen;
-       if (!nd_push_buffer(ndo, pt, pt, ep)) {
+       if (!nd_push_buffer(ndo, pt, pt, payloadlen)) {
                free(pt);
                (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
                        "%s: can't push buffer on buffer stack", __func__);
@@ -892,14 +893,14 @@ esp_print(netdissect_options *ndo,
         * it was not decrypted with the correct key, so that the
         * "plaintext" is not what was being sent.
         */
-       padlen = GET_U_1(ep - 2);
+       padlen = GET_U_1(pt + payloadlen - 2);
        if (padlen + 2 > payloadlen) {
                nd_print_trunc(ndo);
                return;
        }
 
        /* Get the next header */
-       nh = GET_U_1(ep - 1);
+       nh = GET_U_1(pt + payloadlen - 1);
 
        ND_PRINT(": ");
 
@@ -907,7 +908,10 @@ esp_print(netdissect_options *ndo,
         * Don't put padding + padding length(1 byte) + next header(1 byte)
         * in the buffer because they are not part of the plaintext to decode.
         */
-       nd_push_snapend(ndo, ep - (padlen + 2));
+       if (!nd_push_snaplen(ndo, pt, payloadlen - (padlen + 2))) {
+               (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
+                       "%s: can't push snaplen on buffer stack", __func__);
+       }
 
        /* Now dissect the plaintext. */
        ip_demux_print(ndo, pt, payloadlen - (padlen + 2), ver, fragmented,
@@ -915,10 +919,10 @@ esp_print(netdissect_options *ndo,
 
        /* Pop the buffer, freeing it. */
        nd_pop_packet_info(ndo);
-       /* Pop the nd_push_snapend */
+       /* Pop the nd_push_snaplen */
        nd_pop_packet_info(ndo);
 #endif
 }
 #ifdef HAVE_LIBCRYPTO
-USES_APPLE_RST
+DIAG_ON_DEPRECATION
 #endif