Introduce a buffer stack, and use it for ESP decryption.

[tcpdump] / netdissect.c

diff --git a/netdissect.c b/netdissect.c
index d32de4e97816f8f96acab65397345fe099f7204b..08a3280c43dc0e2463c07f8930ea5bfdd8f47ea0 100644 (file)
--- a/netdissect.c
+++ b/netdissect.c
@@ -144,3 +144,46 @@ nd_smi_version_string(void)
        return (NULL);
 #endif
 }
+
+
+int
+nd_push_buffer(netdissect_options *ndo, u_char *new_buffer,
+    const u_char *new_packetp, const u_char *new_snapend)
+{
+       struct netdissect_saved_info *ndsi;
+
+       ndsi = (struct netdissect_saved_info *)malloc(sizeof(struct netdissect_saved_info));
+       if (ndsi == NULL)
+               return (0);     /* fail */
+       ndsi->ndsi_buffer = new_buffer;
+       ndsi->ndsi_packetp = ndo->ndo_packetp;
+       ndsi->ndsi_snapend = ndo->ndo_snapend;
+       ndsi->ndsi_prev = ndo->ndo_buffer_stack;
+
+       ndo->ndo_packetp = new_packetp;
+       ndo->ndo_snapend = new_snapend;
+       ndo->ndo_buffer_stack = ndsi;
+
+       return (1);     /* success */
+}
+
+void
+nd_pop_buffer(netdissect_options *ndo)
+{
+       struct netdissect_saved_info *ndsi;
+
+       ndsi = ndo->ndo_buffer_stack;
+       ndo->ndo_packetp = ndsi->ndsi_packetp;
+       ndo->ndo_snapend = ndsi->ndsi_snapend;
+       ndo->ndo_buffer_stack = ndsi->ndsi_prev;
+
+       free(ndsi->ndsi_buffer);
+       free(ndsi);
+}
+
+void
+nd_pop_all_buffers(netdissect_options *ndo)
+{
+       while (ndo->ndo_buffer_stack != NULL)
+               nd_pop_buffer(ndo);
+}