3 files changed, 649 insertions, 0 deletions
diff --git a/code/core/vconn/Makefile b/code/core/vconn/Makefile
new file mode 100644
index 0000000..613601c
--- /dev/null
+++ b/code/core/vconn/Makefile
@@ -0,0 +1,14 @@
+include ../../Makefile.platform
+CFLAGS=$(CFLAGS_PL) $(PIC) -I..
+
+obj = vconn.o
+
+
+%.o: %.c %.h
+	$(CC) $(CFLAGS) -c $<
+
+all: $(obj)
+	$(AR) rcs libecpvconn.a $(obj)
+
+clean:
+	rm -f *.o *.a
+\ No newline at end of file
diff --git a/code/core/vconn/vconn.c b/code/core/vconn/vconn.c
new file mode 100644
index 0000000..dadff0f
--- /dev/null
+++ b/code/core/vconn/vconn.c
@@ -0,0 +1,613 @@
+#include "core.h"
+#include "vconn.h"
+
+#include <string.h>
+
+#ifdef ECP_WITH_PTHREAD
+static pthread_mutex_t key_perma_mutex;
+static pthread_mutex_t key_next_mutex;
+#endif
+
+static void *key_perma_table;
+static void *key_next_table;
+    
+static unsigned char key_null[ECP_ECDH_SIZE_KEY] = { 0 };
+
+static ECPConnHandler handler_vc;
+static ECPConnHandler handler_vl;
+
+static int vconn_create(ECPConnection *conn, unsigned char *payload, size_t size) {
+    ECPContext *ctx = conn->sock->ctx;
+    ECPVConnIn *conn_v = (ECPVConnIn *)conn;
+    int rv = ECP_OK;
+    
+    if (conn->out) return ECP_ERR;
+    if (conn->type != ECP_CTYPE_VCONN) return ECP_ERR;
+    if (size < 2*ECP_ECDH_SIZE_KEY) return ECP_ERR;
+
+    conn_v->key_next_curr = 0;
+    memset(conn_v->key_next, 0, sizeof(conn_v->key_next));
+    memset(conn_v->key_out, 0, sizeof(conn_v->key_out));
+    memcpy(conn_v->key_next[conn_v->key_next_curr], payload, ECP_ECDH_SIZE_KEY);
+    memcpy(conn_v->key_out, payload+ECP_ECDH_SIZE_KEY, ECP_ECDH_SIZE_KEY);
+
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_lock(&key_next_mutex);
+#endif
+#ifdef ECP_WITH_HTABLE
+    rv = ctx->ht.init ? ctx->ht.insert(key_next_table, conn_v->key_next[conn_v->key_next_curr], conn) : ECP_ERR;
+#endif
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_unlock(&key_next_mutex);
+#endif
+    
+    return rv;
+}
+
+static void vconn_destroy(ECPConnection *conn) {
+    ECPContext *ctx = conn->sock->ctx;
+    ECPVConnIn *conn_v = (ECPVConnIn *)conn;
+
+    if (conn->out) return;
+    if (conn->type != ECP_CTYPE_VCONN) return;
+
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_lock(&key_next_mutex);
+    pthread_mutex_lock(&conn->mutex);
+#endif
+#ifdef ECP_WITH_HTABLE
+    if (ctx->ht.init) {
+        int i;
+        for (i=0; i<ECP_MAX_NODE_KEY; i++) {
+            if (memcmp(conn_v->key_next[i], key_null, ECP_ECDH_SIZE_KEY)) ctx->ht.remove(key_next_table, conn_v->key_next[i]);
+        }
+    }
+#endif
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_unlock(&conn->mutex);
+    pthread_mutex_unlock(&key_next_mutex);
+#endif
+}
+
+static ssize_t _vconn_send_open(ECPConnection *conn, ECPTimerItem *ti) {
+    ECPBuffer packet;
+    ECPBuffer payload;
+    unsigned char pkt_buf[ECP_SIZE_PKT_BUF(0, ECP_MTYPE_KGET_REQ, conn)];
+    unsigned char pld_buf[ECP_SIZE_PLD_BUF(0, ECP_MTYPE_KGET_REQ, conn)];
+    
+    packet.buffer = pkt_buf;
+    packet.size = ECP_SIZE_PKT_BUF(0, ECP_MTYPE_KGET_REQ, conn);
+    payload.buffer = pld_buf;
+    payload.size = ECP_SIZE_PLD_BUF(0, ECP_MTYPE_KGET_REQ, conn);
+
+    ecp_pld_set_type(pld_buf, ECP_MTYPE_KGET_REQ);
+    return ecp_pld_send_ll(conn, &packet, ECP_ECDH_IDX_PERMA, ECP_ECDH_IDX_INV, &payload, ECP_SIZE_PLD(0, ECP_MTYPE_KGET_REQ), ti);
+}
+
+static ssize_t vconn_open(ECPConnection *conn) {
+    int rv = ECP_OK;
+    ECPTimerItem ti;
+    ECPVConnection *conn_v = (ECPVConnection *)conn;
+    ECPConnection *conn_next = conn_v->next;
+
+    if (conn_next == NULL) return ECP_ERR;
+
+    ssize_t _rv = ecp_timer_send(conn_next, _vconn_send_open, ECP_MTYPE_KGET_REP, 3, 3000);
+    if (_rv < 0) return _rv;
+
+    return _rv;
+}
+
+static ssize_t vconn_handle_open(ECPConnection *conn, ecp_seq_t seq, unsigned char mtype, unsigned char *msg, ssize_t size, ECP2Buffer *b) {
+    if (conn->type != ECP_CTYPE_VCONN) return ECP_ERR;
+
+    if (mtype & ECP_MTYPE_FLAG_REP) {
+        if (!conn->out) return ECP_ERR;
+        if (size < 0) {
+            ecp_conn_handler_msg_t *handler = NULL;
+            while (conn->type == ECP_CTYPE_VCONN) {
+                ECPVConnection *conn_v = (ECPVConnection *)conn;
+                conn = conn_v->next;
+            }
+            handler = conn->sock->ctx->handler[conn->type] ? conn->sock->ctx->handler[conn->type]->msg[ECP_MTYPE_OPEN] : NULL;
+            return handler ? handler(conn, seq, mtype, msg, size, b) : size;
+        }
+
+        return ecp_conn_handle_open(conn, seq, mtype, msg, size, b);
+    } else {
+        ECPContext *ctx = conn->sock->ctx;
+        ECPVConnIn *conn_v = (ECPVConnIn *)conn;
+        int rv = ECP_OK;
+        unsigned char ctype = 0;
+
+        if (conn->out) return ECP_ERR;
+        if (size < 0) return size;
+        if (size < 1+2*ECP_ECDH_SIZE_KEY) return ECP_ERR;
+
+#ifdef ECP_WITH_PTHREAD
+        pthread_mutex_lock(&key_next_mutex);
+        pthread_mutex_lock(&conn->mutex);
+#endif
+
+        ctype = msg[0];
+        msg++;
+
+        if (!ecp_conn_is_open(conn)) conn->flags |= ECP_CONN_FLAG_OPEN;
+        if (memcmp(conn_v->key_next[conn_v->key_next_curr], msg, ECP_ECDH_SIZE_KEY)) {
+            conn_v->key_next_curr = (conn_v->key_next_curr + 1) % ECP_MAX_NODE_KEY;
+#ifdef ECP_WITH_HTABLE
+            if (ctx->ht.init) {
+                if (memcmp(conn_v->key_next[conn_v->key_next_curr], key_null, ECP_ECDH_SIZE_KEY)) ctx->ht.remove(key_next_table, conn_v->key_next[conn_v->key_next_curr]);
+                rv = ctx->ht.insert(key_next_table, conn_v->key_next[conn_v->key_next_curr], conn);
+            } else {
+                rv = ECP_ERR;
+            }
+#endif
+            if (!rv) memcpy(conn_v->key_next[conn_v->key_next_curr], msg, ECP_ECDH_SIZE_KEY);
+        }
+
+#ifdef ECP_WITH_PTHREAD
+        pthread_mutex_unlock(&conn->mutex);
+        pthread_mutex_unlock(&key_next_mutex);
+#endif
+    
+        if (rv) return rv;
+
+        return 1+2*ECP_ECDH_SIZE_KEY;
+    }
+
+    return ECP_ERR;
+}
+
+static ssize_t vconn_handle_relay(ECPConnection *conn, ecp_seq_t seq, unsigned char mtype, unsigned char *msg, ssize_t size, ECP2Buffer *b) {
+    ECPContext *ctx = conn->sock->ctx;
+    ECPConnection *conn_out = NULL;
+    ECPVConnIn *conn_v = (ECPVConnIn *)conn;
+    ssize_t rv;
+
+    if (conn->out) return ECP_ERR;
+    if (conn->type != ECP_CTYPE_VCONN) return ECP_ERR;
+    if (b == NULL) return ECP_ERR;
+    
+    if (size < 0) return size;
+    if (size < ECP_MIN_PKT) return ECP_ERR_MIN_PKT;
+
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_lock(&key_perma_mutex);
+#endif
+#ifdef ECP_WITH_HTABLE
+    conn_out = ctx->ht.init ? ctx->ht.search(key_perma_table, conn_v->key_out) : NULL;
+#endif
+    if (conn_out) {
+#ifdef ECP_WITH_PTHREAD
+        pthread_mutex_lock(&conn_out->mutex);
+#endif
+        conn_out->refcount++;
+#ifdef ECP_WITH_PTHREAD
+        pthread_mutex_unlock(&conn_out->mutex);
+#endif
+    }
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_unlock(&key_perma_mutex);
+#endif
+
+    if (conn_out == NULL) return ECP_ERR;
+    
+    ECPBuffer payload;
+    payload.buffer = msg - ECP_SIZE_PLD_HDR - 1;
+    payload.size = b->payload->size - (payload.buffer - b->payload->buffer);
+
+    ecp_pld_set_type(payload.buffer, ECP_MTYPE_EXEC);
+    rv = ecp_pld_send(conn_out, b->packet, &payload, ECP_SIZE_PLD_HDR+1+size);
+
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_lock(&conn_out->mutex);
+#endif
+    conn_out->refcount--;
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_unlock(&conn_out->mutex);
+#endif
+
+    if (rv < 0) return rv;
+    return size;
+}
+
+static int vlink_insert(ECPConnection *conn) {
+    int rv = ECP_OK;
+    ECPContext *ctx = conn->sock->ctx;
+    
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_lock(&key_perma_mutex);
+#endif
+#ifdef ECP_WITH_HTABLE
+    rv = ctx->ht.init ? ctx->ht.insert(key_perma_table, ctx->cr.dh_pub_get_buf(&conn->node.public), conn) : ECP_OK;
+#endif
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_unlock(&key_perma_mutex);
+#endif
+
+    return rv;
+}
+
+static void vlink_remove(ECPConnection *conn) {
+    ECPContext *ctx = conn->sock->ctx;
+    
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_lock(&key_perma_mutex);
+#endif
+#ifdef ECP_WITH_HTABLE
+    if (ctx->ht.init) ctx->ht.remove(key_perma_table, ctx->cr.dh_pub_get_buf(&conn->node.public));
+#endif
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_unlock(&key_perma_mutex);
+#endif
+}
+
+static int vlink_create(ECPConnection *conn, unsigned char *payload, size_t size) {
+    ECPContext *ctx = conn->sock->ctx;
+    
+    if (conn->out) return ECP_ERR;
+    if (conn->type != ECP_CTYPE_VLINK) return ECP_ERR;
+
+    // XXX should verify perma_key
+    if (size < ECP_ECDH_SIZE_KEY) return ECP_ERR;
+    ctx->cr.dh_pub_from_buf(&conn->node.public, payload);
+
+    return vlink_insert(conn);
+}
+
+static void vlink_destroy(ECPConnection *conn) {
+    ECPContext *ctx = conn->sock->ctx;
+
+    if (conn->out) return;
+    if (conn->type != ECP_CTYPE_VLINK) return;
+
+    vlink_remove(conn);
+}
+
+static ssize_t _vlink_send_open(ECPConnection *conn, ECPTimerItem *ti) {
+    ECPSocket *sock = conn->sock;
+    ECPContext *ctx = sock->ctx;
+
+    ECPBuffer packet;
+    ECPBuffer payload;
+    unsigned char pkt_buf[ECP_SIZE_PKT_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_OPEN_REQ, conn)];
+    unsigned char pld_buf[ECP_SIZE_PLD_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_OPEN_REQ, conn)];
+    unsigned char *buf = ecp_pld_get_buf(pld_buf, ECP_MTYPE_OPEN_REQ);
+    int rv = ECP_OK;
+    
+    packet.buffer = pkt_buf;
+    packet.size = ECP_SIZE_PKT_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_OPEN_REQ, conn);
+    payload.buffer = pld_buf;
+    payload.size = ECP_SIZE_PLD_BUF(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_OPEN_REQ, conn);
+
+    // XXX server should verify perma_key
+    ecp_pld_set_type(pld_buf, ECP_MTYPE_OPEN_REQ);
+    buf[0] = conn->type;
+    memcpy(buf+1, ctx->cr.dh_pub_get_buf(&sock->key_perma.public), ECP_ECDH_SIZE_KEY);
+
+    return ecp_pld_send_wtimer(conn, &packet, &payload, ECP_SIZE_PLD(ECP_ECDH_SIZE_KEY+1, ECP_MTYPE_OPEN_REQ), ti);
+}
+
+static ssize_t vlink_open(ECPConnection *conn) {
+    return ecp_timer_send(conn, _vlink_send_open, ECP_MTYPE_OPEN_REP, 3, 500);
+}
+
+static void vlink_close(ECPConnection *conn) {
+    vlink_remove(conn);
+}
+
+static ssize_t vlink_handle_open(ECPConnection *conn, ecp_seq_t seq, unsigned char mtype, unsigned char *msg, ssize_t size, ECP2Buffer *b) {
+    ssize_t rv;
+    int is_open;
+    
+    if (conn->type != ECP_CTYPE_VLINK) return ECP_ERR;
+
+    if (size < 0) return size;
+    
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_lock(&conn->mutex);
+#endif
+    is_open = ecp_conn_is_open(conn);
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_unlock(&conn->mutex);
+#endif
+
+    rv = ecp_conn_handle_open(conn, seq, mtype, msg, size, b);
+    if (rv < 0) return rv;
+
+    if (mtype & ECP_MTYPE_FLAG_REP) {
+        if (!conn->out) return ECP_ERR;
+        if (!is_open) {
+            int rv = vlink_insert(conn);
+            if (rv) return rv;
+        }
+        return rv;
+    } else {
+        if (conn->out) return ECP_ERR;
+        if (size < rv+ECP_ECDH_SIZE_KEY) return ECP_ERR;
+
+        msg += rv;
+
+        // XXX should verify perma_key
+        return rv+ECP_ECDH_SIZE_KEY;
+    }
+
+    return ECP_ERR;
+}
+
+static ssize_t vlink_handle_relay(ECPConnection *conn, ecp_seq_t seq, unsigned char mtype, unsigned char *msg, ssize_t size, ECP2Buffer *b) {
+    ECPContext *ctx = conn->sock->ctx;
+    ssize_t rv;
+
+    if (conn->type != ECP_CTYPE_VLINK) return ECP_ERR;
+    if (b == NULL) return ECP_ERR;
+
+    if (size < 0) return size;
+    if (size < ECP_MIN_PKT) return ECP_ERR_MIN_PKT;
+
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_lock(&key_next_mutex);
+#endif
+#ifdef ECP_WITH_HTABLE
+    conn = ctx->ht.init ? ctx->ht.search(key_next_table, msg+ECP_SIZE_PROTO+1) : NULL;
+#endif
+    if (conn) {
+#ifdef ECP_WITH_PTHREAD
+        pthread_mutex_lock(&conn->mutex);
+#endif
+        conn->refcount++;
+#ifdef ECP_WITH_PTHREAD
+        pthread_mutex_unlock(&conn->mutex);
+#endif
+    }
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_unlock(&key_next_mutex);
+#endif
+
+    if (conn == NULL) return ECP_ERR;
+
+    ECPBuffer payload;
+    payload.buffer = msg - ECP_SIZE_PLD_HDR - 1;
+    payload.size = b->payload->size - (payload.buffer - b->payload->buffer);
+
+    ecp_pld_set_type(payload.buffer, ECP_MTYPE_EXEC);
+    rv = ecp_pld_send(conn, b->packet, &payload, ECP_SIZE_PLD_HDR+1+size);
+
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_lock(&conn->mutex);
+#endif
+    conn->refcount--;
+#ifdef ECP_WITH_PTHREAD
+    pthread_mutex_unlock(&conn->mutex);
+#endif
+
+    if (rv < 0) return rv;
+    return size;
+}
+
+static ssize_t vconn_set_msg(ECPConnection *conn, ECPBuffer *payload, unsigned char mtype) {
+    if (conn->out && (conn->type == ECP_CTYPE_VCONN) && ((mtype == ECP_MTYPE_OPEN_REQ) || (mtype == ECP_MTYPE_KGET_REQ))) {
+        ECPVConnection *conn_v = (ECPVConnection *)conn;
+        ECPContext *ctx = conn->sock->ctx;
+        ECPConnection *conn_next = conn_v->next;
+        unsigned char *buf = NULL;
+        int rv;
+
+        if (payload->size < ECP_SIZE_PLD_HDR + 3 + 2 * ECP_ECDH_SIZE_KEY) return ECP_ERR;
+        if (conn_next == NULL) return ECP_ERR;
+
+        ecp_pld_set_type(payload->buffer, ECP_MTYPE_OPEN_REQ);
+        buf = ecp_pld_get_buf(payload->buffer, 0);
+
+        buf[0] = ECP_CTYPE_VCONN;
+        rv = ecp_conn_dhkey_get_curr(conn_next, NULL, buf+1);
+        if (rv) return rv;
+
+        memcpy(buf+1+ECP_ECDH_SIZE_KEY, ctx->cr.dh_pub_get_buf(&conn_next->node.public), ECP_ECDH_SIZE_KEY);
+        buf[1+2*ECP_ECDH_SIZE_KEY] = ECP_MTYPE_RELAY;
+
+        return ECP_SIZE_PLD_HDR + 3 + 2 * ECP_ECDH_SIZE_KEY;
+    } else {
+        if (payload->size < ECP_SIZE_PLD_HDR + 1) return ECP_ERR;
+
+        ecp_pld_set_type(payload->buffer, ECP_MTYPE_RELAY);
+
+        return ECP_SIZE_PLD_HDR + 1;
+    }
+
+}
+
+/* Memory limited version: */
+static ssize_t vconn_pack(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPBuffer *payload, size_t pld_size, ECPSeqItem *si, ECPNetAddr *addr) {
+    ECPContext *ctx = conn->sock->ctx;
+
+    if (conn->parent) {
+        unsigned char mtype = ecp_pld_get_type(payload->buffer);
+        ssize_t rv, hdr_size = vconn_set_msg(conn->parent, packet, mtype);
+        if (hdr_size < 0) return hdr_size;
+
+        rv = ecp_conn_pack(conn, packet->buffer+hdr_size, packet->size-hdr_size, s_idx, c_idx, payload->buffer, pld_size, si, NULL);
+        if (rv < 0) return rv;
+
+        if (payload->size < rv+hdr_size) return ECP_ERR;
+        memcpy(payload->buffer, packet->buffer, rv+hdr_size);
+
+        return vconn_pack(conn->parent, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, payload, rv+hdr_size, NULL, addr);
+    } else {
+        return ecp_conn_pack(conn, packet->buffer, packet->size, s_idx, c_idx, payload->buffer, pld_size, si, addr);
+    }
+}
+
+static ssize_t vconn_pack_raw(ECPSocket *sock, ECPConnection *parent, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ecp_dh_public_t *public, ecp_aead_key_t *shsec, unsigned char *nonce, ecp_seq_t seq, ECPBuffer *payload, size_t pld_size, ECPNetAddr *addr) {
+    ECPContext *ctx = sock->ctx;
+
+    if (parent) {
+        unsigned char mtype = ecp_pld_get_type(payload->buffer);
+        ssize_t rv, hdr_size = vconn_set_msg(parent, packet, mtype);
+        if (hdr_size < 0) return hdr_size;
+
+        rv = ecp_pack(ctx, packet->buffer+hdr_size, packet->size-hdr_size, s_idx, c_idx, public, shsec, nonce, seq, payload->buffer, pld_size);
+        if (rv < 0) return rv;
+
+        if (payload->size < rv+hdr_size) return ECP_ERR;
+        memcpy(payload->buffer, packet->buffer, rv+hdr_size);
+
+        return vconn_pack(parent, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, payload, rv+hdr_size, NULL, addr);
+    } else {
+        return ecp_pack(ctx, packet->buffer, packet->size, s_idx, c_idx, public, shsec, nonce, seq, payload->buffer, pld_size);
+    }
+}
+
+/* Non memory limited version: */
+/*
+static ssize_t vconn_pack(ECPConnection *conn, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ECPBuffer *payload, size_t pld_size, ECPSeqItem *si, ECPNetAddr *addr) {
+    ECPContext *ctx = conn->sock->ctx;
+
+    if (conn->parent) {
+        ECPBuffer payload_;
+        unsigned char pld_buf[ECP_MAX_PLD];
+        
+        payload_.buffer = pld_buf;
+        payload_.size = ECP_MAX_PLD;
+        
+        unsigned char mtype = ecp_pld_get_type(payload->buffer);
+        ssize_t rv, hdr_size = vconn_set_msg(conn->parent, &payload_, mtype);
+        if (hdr_size < 0) return hdr_size;
+
+        rv = ecp_conn_pack(conn, payload_.buffer+hdr_size, payload_.size-hdr_size, s_idx, c_idx, payload->buffer, pld_size, si, NULL);
+        if (rv < 0) return rv;
+
+        return vconn_pack(conn->parent, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, &payload_, rv+hdr_size, NULL, addr);
+    } else {
+        return ecp_conn_pack(conn, packet->buffer, packet->size, s_idx, c_idx, payload->buffer, pld_size, si, addr);
+    }
+}
+
+static ssize_t vconn_pack_raw(ECPSocket *sock, ECPConnection *parent, ECPBuffer *packet, unsigned char s_idx, unsigned char c_idx, ecp_dh_public_t *public, ecp_aead_key_t *shsec, unsigned char *nonce, ecp_seq_t seq, ECPBuffer *payload, size_t pld_size, ECPNetAddr *addr) {
+    ECPContext *ctx = sock->ctx;
+
+    if (parent) {
+        ECPBuffer payload_;
+        unsigned char pld_buf[ECP_MAX_PLD];
+        
+        payload_.buffer = pld_buf;
+        payload_.size = ECP_MAX_PLD;
+
+        unsigned char mtype = ecp_pld_get_type(payload->buffer);
+        ssize_t rv, hdr_size = vconn_set_msg(parent, &payload_, mtype);
+        if (hdr_size < 0) return hdr_size;
+
+        rv = ecp_pack(ctx, payload_.buffer+hdr_size, payload_.size-hdr_size, s_idx, c_idx, public, shsec, nonce, seq, payload->buffer, pld_size);
+        if (rv < 0) return rv;
+
+        return vconn_pack(parent, packet, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, &payload_, rv+hdr_size, NULL, addr);
+    } else {
+        return ecp_pack(ctx, packet->buffer, packet->size, s_idx, c_idx, public, shsec, nonce, seq, payload->buffer, pld_size);
+    }
+}
+*/
+
+int ecp_ctx_vconn_init(ECPContext *ctx) {
+    int rv;
+    
+    rv = ecp_conn_handler_init(&handler_vc);
+    if (rv) return rv;
+    
+    handler_vc.conn_create = vconn_create;
+    handler_vc.conn_destroy = vconn_destroy;
+    handler_vc.conn_open = vconn_open;
+    handler_vc.msg[ECP_MTYPE_OPEN] = vconn_handle_open;
+    handler_vc.msg[ECP_MTYPE_EXEC] = ecp_conn_handle_exec;
+    handler_vc.msg[ECP_MTYPE_RELAY] = vconn_handle_relay;
+    ctx->handler[ECP_CTYPE_VCONN] = &handler_vc;
+
+    rv = ecp_conn_handler_init(&handler_vl);
+    if (rv) return rv;
+
+    handler_vl.conn_create = vlink_create;
+    handler_vl.conn_destroy = vlink_destroy;
+    handler_vl.conn_open = vlink_open;
+    handler_vl.conn_close = vlink_close;
+    handler_vl.msg[ECP_MTYPE_OPEN] = vlink_handle_open;
+    handler_vl.msg[ECP_MTYPE_EXEC] = ecp_conn_handle_exec;
+    handler_vl.msg[ECP_MTYPE_RELAY] = vlink_handle_relay;
+    ctx->handler[ECP_CTYPE_VLINK] = &handler_vl;
+
+    ctx->pack = vconn_pack;
+    ctx->pack_raw = vconn_pack_raw;
+
+#ifdef ECP_WITH_PTHREAD
+    rv = pthread_mutex_init(&key_perma_mutex, NULL);
+    if (!rv) pthread_mutex_init(&key_next_mutex, NULL);
+    if (rv) return ECP_ERR;
+#endif
+
+#ifdef ECP_WITH_HTABLE
+    if (ctx->ht.init) {
+        key_perma_table = ctx->ht.create(ctx);
+        key_next_table = ctx->ht.create(ctx);
+        if ((key_perma_table == NULL) || (key_next_table == NULL)) return ECP_ERR;
+    }
+#endif
+    
+    return ECP_OK;
+}
+
+int ecp_vconn_init(ECPConnection *conn, ECPNode *conn_node, ECPVConnection vconn[], ECPNode vconn_node[], int size) {
+    ECPSocket *sock = conn->sock;
+    int i, rv;
+    
+    rv = ecp_conn_init(conn, conn_node);
+    if (rv) return rv;
+
+    conn->parent = (ECPConnection *)&vconn[size-1];
+    conn->pcount = size;
+    for (i=0; i<size; i++) {
+        rv = ecp_conn_create((ECPConnection *)&vconn[i], sock, ECP_CTYPE_VCONN);
+        if (rv) return rv;
+
+        rv = ecp_conn_init((ECPConnection *)&vconn[i], &vconn_node[i]);
+        if (rv) return rv;
+
+        if (i == 0) {
+            vconn[i].b.parent = NULL;
+        } else {
+            vconn[i].b.parent = (ECPConnection *)&vconn[i-1];
+        }
+        vconn[i].b.pcount = i;
+
+        if (i == size - 1) {
+            vconn[i].next = conn;
+        } else {
+            vconn[i].next = (ECPConnection *)&vconn[i+1];
+        }
+    }
+    
+    return ECP_OK;
+}
+
+static ssize_t _vconn_send_kget(ECPConnection *conn, ECPTimerItem *ti) {
+    ECPBuffer packet;
+    ECPBuffer payload;
+    unsigned char pkt_buf[ECP_SIZE_PKT_BUF(0, ECP_MTYPE_KGET_REQ, conn)];
+    unsigned char pld_buf[ECP_SIZE_PLD_BUF(0, ECP_MTYPE_KGET_REQ, conn)];
+    
+    packet.buffer = pkt_buf;
+    packet.size = ECP_SIZE_PKT_BUF(0, ECP_MTYPE_KGET_REQ, conn);
+    payload.buffer = pld_buf;
+    payload.size = ECP_SIZE_PLD_BUF(0, ECP_MTYPE_KGET_REQ, conn);
+
+    ecp_pld_set_type(pld_buf, ECP_MTYPE_KGET_REQ);
+    return ecp_pld_send_ll(conn, &packet, ECP_ECDH_IDX_PERMA, ECP_ECDH_IDX_INV, &payload, ECP_SIZE_PLD(0, ECP_MTYPE_KGET_REQ), ti);
+}
+
+int ecp_vconn_open(ECPConnection *conn, ECPNode *conn_node, ECPVConnection vconn[], ECPNode vconn_node[], int size) {
+    int rv = ecp_vconn_init(conn, conn_node, vconn, vconn_node, size);
+    if (rv) return rv;
+
+    ssize_t _rv = ecp_timer_send((ECPConnection *)&vconn[0], _vconn_send_kget, ECP_MTYPE_KGET_REP, 3, 500);
+    if (_rv < 0) return _rv;
+    
+    return ECP_OK;
+}
+\ No newline at end of file
diff --git a/code/core/vconn/vconn.h b/code/core/vconn/vconn.h
new file mode 100644
index 0000000..07832c7
--- /dev/null
+++ b/code/core/vconn/vconn.h
@@ -0,0 +1,22 @@
+#define ECP_CTYPE_VCONN     1
+#define ECP_CTYPE_VLINK     2
+
+#define ECP_MTYPE_RELAY     0x08
+#define ECP_MTYPE_EXEC      0x09
+
+typedef struct ECPVConnection {
+    ECPConnection b;
+    ECPConnection *next;
+} ECPVConnection;
+
+typedef struct ECPVConnIn {
+    ECPConnection b;
+    unsigned char key_next[ECP_MAX_NODE_KEY][ECP_ECDH_SIZE_KEY];
+    unsigned char key_next_curr;
+    unsigned char key_out[ECP_ECDH_SIZE_KEY];
+} ECPVConnIn;
+
+int ecp_ctx_vconn_init(ECPContext *ctx);
+
+int ecp_vconn_init(ECPConnection *conn, ECPNode *conn_node, ECPVConnection vconn[], ECPNode vconn_node[], int size);
+int ecp_vconn_open(ECPConnection *conn, ECPNode *conn_node, ECPVConnection vconn[], ECPNode vconn_node[], int size);