1 files changed, 136 insertions, 0 deletions
diff --git a/agent/mibgroup/snmp-usm-dh-objects-mib/usmDHParameters/usmDHParameters.c b/agent/mibgroup/snmp-usm-dh-objects-mib/usmDHParameters/usmDHParameters.c
new file mode 100644
index 0000000..d28225d
--- /dev/null
+++ b/agent/mibgroup/snmp-usm-dh-objects-mib/usmDHParameters/usmDHParameters.c
@@ -0,0 +1,136 @@
+/*
+ * Note: this file originally auto-generated by mib2c using
+ *        : mib2c.scalar.conf,v 1.7 2003/04/08 14:57:04 dts12 Exp $
+ */
+
+#include <net-snmp/net-snmp-config.h>
+#include <net-snmp/net-snmp-includes.h>
+#include <net-snmp/agent/net-snmp-agent-includes.h>
+#include "usmDHParameters.h"
+
+#include <openssl/dh.h>
+
+static DH *dh_params = NULL;
+
+DH *
+get_dh_params(void)
+{
+    return dh_params;
+}
+
+/** Initializes the usmDHParameters module */
+void
+init_usmDHParameters(void)
+{
+    static oid      usmDHParameters_oid[] =
+        { 1, 3, 6, 1, 3, 101, 1, 1, 1 };
+
+    DEBUGMSGTL(("usmDHParameters", "Initializing\n"));
+
+    netsnmp_register_scalar(netsnmp_create_handler_registration
+                            ("usmDHParameters", handle_usmDHParameters,
+                             usmDHParameters_oid,
+                             OID_LENGTH(usmDHParameters_oid),
+                             HANDLER_CAN_RWRITE));
+
+    /* currently hard coded to the oakly group 2 set. */
+    /* these values are modifiable via SNMP SETs if needed by
+       management apps though */
+    if (!dh_params) {
+        dh_params = DH_new();
+        dh_params->g = BN_new();
+        BN_hex2bn(&dh_params->g, "02");
+        BN_hex2bn(&dh_params->p, "ffffffffffffffffc90fdaa22168c234c4c6628b80dc1cd129024e088a67cc74020bbea63b139b22514a08798e3404ddef9519b3cd3a431b302b0a6df25f14374fe1356d6d51c245e485b576625e7ec6f44c42e9a637ed6b0bff5cb6f406b7edee386bfb5a899fa5ae9f24117c4b1fe649286651ece65381ffffffffffffffff");
+    }
+}
+
+int
+handle_usmDHParameters(netsnmp_mib_handler *handler,
+                       netsnmp_handler_registration *reginfo,
+                       netsnmp_agent_request_info *reqinfo,
+                       netsnmp_request_info *requests)
+{
+    /*
+     * We are never called for a GETNEXT if it's registered as a
+     * "instance", as it's "magically" handled for us.  
+     */
+
+    static unsigned char *cp = NULL;
+    static DH *dh_tmpp = NULL;
+    int cp_len;
+
+    /*
+     * a instance handler also only hands us one request at a time, so
+     * we don't need to loop over a list of requests; we'll only get one. 
+     */
+
+    switch (reqinfo->mode) {
+
+    case MODE_GET:
+        if(cp) {
+            free(cp);
+            cp = NULL;
+        }
+        cp_len = i2d_DHparams(dh_params, &cp);
+        if (cp_len > 0)
+            snmp_set_var_typed_value(requests->requestvb, ASN_OCTET_STR,
+                                     (u_char *) cp, cp_len);
+        break;
+
+        /*
+         * SET REQUEST
+         *
+         * multiple states in the transaction.  See:
+         * http://www.net-snmp.org/tutorial-5/toolkit/mib_module/set-actions.jpg
+         */
+    case MODE_SET_RESERVE1:
+        break;
+
+    case MODE_SET_RESERVE2:
+        cp = requests->requestvb->val.string;
+        dh_tmpp = d2i_DHparams(NULL, (const unsigned char **) (void *)&cp,
+                               requests->requestvb->val_len);
+        if ( !dh_tmpp) {
+            netsnmp_set_request_error(reqinfo, requests, SNMP_ERR_WRONGVALUE);
+        }
+        if (cp - requests->requestvb->val.string !=
+            requests->requestvb->val_len) {
+            /* value too long; we didn't parse the whole thing */
+            netsnmp_set_request_error(reqinfo, requests, SNMP_ERR_WRONGVALUE);
+            DH_free(dh_tmpp);
+            dh_tmpp = NULL;
+        }
+        break;
+
+    case MODE_SET_FREE:
+    case MODE_SET_COMMIT:
+        DH_free(dh_tmpp);
+        dh_tmpp = NULL;
+        break;
+
+    case MODE_SET_ACTION:
+    {
+        DH *tmpp;
+        tmpp = dh_params;
+        dh_params = dh_tmpp;
+        dh_tmpp = tmpp;
+        break;
+    }
+
+    case MODE_SET_UNDO:
+    {
+        DH_free(dh_params);  /* free new value */
+        dh_params = dh_tmpp; /* restore old value */
+        dh_tmpp = NULL;
+        break;
+    }
+
+    default:
+        /*
+         * we should never get here, so this is a really bad error 
+         */
+        return SNMP_ERR_GENERR;
+    }
+
+    return SNMP_ERR_NOERROR;
+}