diff options
Diffstat (limited to 'code/proxy.c')
| -rw-r--r-- | code/proxy.c | 438 |
1 files changed, 438 insertions, 0 deletions
diff --git a/code/proxy.c b/code/proxy.c new file mode 100644 index 0000000..a55d53e --- /dev/null +++ b/code/proxy.c @@ -0,0 +1,438 @@ +#include "core.h" +#include "proxy.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_f; +static ECPConnHandler handler_b; + +static int proxyf_create(ECPConnection *conn, unsigned char *payload, size_t size) { + ECPContext *ctx = conn->sock->ctx; + ECPConnProxyF *conn_p = (ECPConnProxyF *)conn; + int rv; + + if (conn->out) return ECP_ERR; + if (conn->type != ECP_CTYPE_PROXYF) return ECP_ERR; + if (size < 2*ECP_ECDH_SIZE_KEY) return ECP_ERR; + + conn_p->key_next_curr = 0; + memcpy(conn_p->key_next[0], payload, ECP_ECDH_SIZE_KEY); + memcpy(conn_p->key_out, payload+ECP_ECDH_SIZE_KEY, ECP_ECDH_SIZE_KEY); + +#ifdef ECP_WITH_PTHREAD + pthread_mutex_lock(&key_next_mutex); +#endif + rv = ctx->ht.init ? ctx->ht.insert(key_next_table, payload+1, conn) : ECP_ERR; +#ifdef ECP_WITH_PTHREAD + pthread_mutex_unlock(&key_next_mutex); +#endif + if (rv) return rv; + + return ECP_OK; +} + +static void proxyf_destroy(ECPConnection *conn) { + ECPContext *ctx = conn->sock->ctx; + ECPConnProxyF *conn_p = (ECPConnProxyF *)conn; + + if (conn->out) return; + if (conn->type != ECP_CTYPE_PROXYF) return; + +#ifdef ECP_WITH_PTHREAD + pthread_mutex_lock(&key_next_mutex); + pthread_mutex_lock(&conn->mutex); +#endif + if (ctx->ht.init) { + int i; + for (i=0; i<ECP_MAX_NODE_KEY; i++) { + if (memcmp(conn_p->key_next[i], key_null, ECP_ECDH_SIZE_KEY)) ctx->ht.remove(key_next_table, conn_p->key_next[i]); + } + } +#ifdef ECP_WITH_PTHREAD + pthread_mutex_unlock(&conn->mutex); + pthread_mutex_unlock(&key_next_mutex); +#endif +} + +static ssize_t _proxyf_send_open(ECPConnection *conn) { + ECPConnProxy *conn_p = (ECPConnProxy *)conn; + ECPConnection *conn_next = conn_p->next; + unsigned char payload[ECP_SIZE_PLD(0)]; + + if (conn_next == NULL) return ECP_ERR; + + ecp_pld_set_type(payload, ECP_MTYPE_KGET); + return ecp_pld_send_wkey(conn_next, ECP_ECDH_IDX_PERMA, ECP_ECDH_IDX_INV, payload, sizeof(payload)); +} + +static ssize_t _proxyf_retry_kget(ECPConnection *conn, ECPTimerItem *ti) { + if (conn->proxy == NULL) return ECP_ERR; + + return _proxyf_send_open(conn->proxy); +} + +static ssize_t proxyf_open(ECPConnection *conn) { + int rv = ECP_OK; + ECPTimerItem ti; + ECPConnProxy *conn_p = (ECPConnProxy *)conn; + ECPConnection *conn_next = conn_p->next; + + rv = ecp_timer_item_init(&ti, conn_next, ECP_MTYPE_KGET, 3, 500); + if (rv) return rv; + + ti.retry = _proxyf_retry_kget; + rv = ecp_timer_push(&ti); + if (rv) return rv; + + return _proxyf_send_open(conn); +} + +static ssize_t proxyf_handle_open(ECPConnection *conn, unsigned char mtype, unsigned char *msg, ssize_t size) { + if (conn->type != ECP_CTYPE_PROXYF) return ECP_ERR; + + if (conn->out) { + if (size < 0) { + ecp_conn_handler_msg_t *handler = NULL; + while (conn->type == ECP_CTYPE_PROXYF) { + ECPConnProxy *conn_p = (ECPConnProxy *)conn; + conn = conn_p->next; + } + handler = conn->sock->ctx->handler[conn->type] ? conn->sock->ctx->handler[conn->type]->msg[ECP_MTYPE_OPEN] : NULL; + return handler ? handler(conn, mtype, msg, size) : size; + } + return 0; + } else { + ECPContext *ctx = conn->sock->ctx; + ECPConnProxyF *conn_p = (ECPConnProxyF *)conn; + int rv = ECP_OK; + + 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 + + if (!ecp_conn_is_open(conn)) conn->flags |= ECP_CONN_FLAG_OPEN; + if (memcmp(conn_p->key_next[conn_p->key_next_curr], msg, ECP_ECDH_SIZE_KEY)) { + rv = ctx->ht.init ? ctx->ht.insert(key_next_table, msg, conn) : ECP_ERR; + if (!rv) { + conn_p->key_next_curr = (conn_p->key_next_curr + 1) % ECP_MAX_NODE_KEY; + if (memcmp(conn_p->key_next[conn_p->key_next_curr], key_null, ECP_ECDH_SIZE_KEY)) { + if (ctx->ht.init) ctx->ht.remove(key_next_table, conn_p->key_next[conn_p->key_next_curr]); + } + memcpy(conn_p->key_next[conn_p->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; + } +} + +static ssize_t proxyf_handle_relay(ECPConnection *conn, unsigned char mtype, unsigned char *msg, ssize_t size) { + ECPContext *ctx = conn->sock->ctx; + ECPConnection *conn_out = NULL; + ECPConnProxyF *conn_p = (ECPConnProxyF *)conn; + unsigned char *payload = NULL; + ssize_t rv; + + if (conn->out) return ECP_ERR; + if (conn->type != ECP_CTYPE_PROXYF) 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 + conn_out = ctx->ht.init ? ctx->ht.search(key_perma_table, conn_p->key_out) : NULL; + 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; + + payload = msg - ECP_SIZE_MSG_HDR; + ecp_pld_set_type(payload, ECP_MTYPE_EXEC); + rv = ecp_pld_send(conn_out, payload, ECP_SIZE_PLD(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 proxyb_create(ECPConnection *conn, unsigned char *payload, size_t size) { + ECPContext *ctx = conn->sock->ctx; + int rv; + + if (conn->out) return ECP_ERR; + if (conn->type != ECP_CTYPE_PROXYB) 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); + +#ifdef ECP_WITH_PTHREAD + pthread_mutex_lock(&key_perma_mutex); +#endif + rv = ctx->ht.init ? ctx->ht.insert(key_perma_table, payload, conn) : ECP_ERR; +#ifdef ECP_WITH_PTHREAD + pthread_mutex_unlock(&key_perma_mutex); +#endif + if (rv) return rv; + + return ECP_OK; +} + +static void proxyb_destroy(ECPConnection *conn) { + ECPContext *ctx = conn->sock->ctx; + + if (conn->out) return; + if (conn->type != ECP_CTYPE_PROXYB) return; + +#ifdef ECP_WITH_PTHREAD + pthread_mutex_lock(&key_perma_mutex); +#endif + if (ctx->ht.init) ctx->ht.remove(key_perma_table, ctx->cr.dh_pub_get_buf(&conn->node.public)); +#ifdef ECP_WITH_PTHREAD + pthread_mutex_unlock(&key_perma_mutex); +#endif +} + +static ssize_t _proxyb_send_open(ECPConnection *conn, ECPTimerItem *ti) { + ECPSocket *sock = conn->sock; + ECPContext *ctx = sock->ctx; + unsigned char payload[ECP_SIZE_PLD(ECP_ECDH_SIZE_KEY+1)]; + unsigned char *buf = ecp_pld_get_buf(payload); + int rv = ECP_OK; + + // XXX server should verify perma_key + ecp_pld_set_type(payload, ECP_MTYPE_OPEN); + 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(conn, payload, sizeof(payload)); +} + +static ssize_t proxyb_open(ECPConnection *conn) { + return ecp_timer_send(conn, _proxyb_send_open, ECP_MTYPE_OPEN, 3, 500); +} + +static ssize_t proxyb_handle_open(ECPConnection *conn, unsigned char mtype, unsigned char *msg, ssize_t size) { + ssize_t rv; + + if (size < 0) return size; + + if (conn->out) return ECP_ERR; + if (conn->type != ECP_CTYPE_PROXYB) return ECP_ERR; + + rv = ecp_conn_handle_open(conn, mtype, msg, size); + if (rv < 0) return rv; + + // XXX should verify perma_key + if (size < rv+ECP_ECDH_SIZE_KEY) return ECP_ERR; + + return rv+ECP_ECDH_SIZE_KEY; +} + +static ssize_t proxyb_handle_relay(ECPConnection *conn, unsigned char mtype, unsigned char *msg, ssize_t size) { + ECPContext *ctx = conn->sock->ctx; + unsigned char *payload = NULL; + ssize_t rv; + + if (conn->out) return ECP_ERR; + if (conn->type != ECP_CTYPE_PROXYB) 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 + conn = ctx->ht.init ? ctx->ht.search(key_next_table, msg+ECP_SIZE_PROTO+1) : NULL; + 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; + + payload = msg - ECP_SIZE_MSG_HDR; + ecp_pld_set_type(payload, ECP_MTYPE_EXEC); + rv = ecp_pld_send(conn, payload, ECP_SIZE_PLD(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 proxy_set_msg(ECPConnection *conn, unsigned char *pld_out, size_t pld_out_size, unsigned char *pld_in, size_t pld_in_size) { + if ((conn->type == ECP_CTYPE_PROXYF) && conn->out) { + unsigned char mtype = ecp_pld_get_type(pld_in); + if ((mtype == ECP_MTYPE_OPEN) || (mtype == ECP_MTYPE_KGET)) { + ECPConnProxy *conn_p = (ECPConnProxy *)conn; + ECPContext *ctx = conn->sock->ctx; + ECPConnection *conn_next = conn_p->next; + unsigned char *buf = NULL; + int rv; + + if (pld_out_size < ECP_SIZE_PLD(2+2*ECP_ECDH_SIZE_KEY)) return ECP_ERR; + if (conn_next == NULL) return ECP_ERR; + + ecp_pld_set_type(pld_out, ECP_MTYPE_OPEN); + buf = ecp_pld_get_buf(pld_out); + + buf[0] = ECP_CTYPE_PROXYF; + 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(2+2*ECP_ECDH_SIZE_KEY); + } + } + + ecp_pld_set_type(pld_out, ECP_MTYPE_RELAY); + return ECP_SIZE_PLD(0); +} + +static ssize_t proxy_pack(ECPConnection *conn, ECPNetAddr *addr, unsigned char *packet, size_t pkt_size, unsigned char s_idx, unsigned char c_idx, unsigned char *payload, size_t payload_size) { + ECPContext *ctx = conn->sock->ctx; + unsigned char payload_[ECP_MAX_PLD]; + ssize_t rv, hdr_size = proxy_set_msg(conn->proxy, payload_, sizeof(payload_), payload, payload_size); + if (hdr_size < 0) return hdr_size; + + rv = ecp_conn_pack(conn, NULL, payload_+hdr_size, ECP_MAX_PLD-hdr_size, s_idx, c_idx, payload, payload_size); + if (rv < 0) return rv; + + return ecp_proxy_pack(conn->proxy, addr, packet, pkt_size, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, payload_, rv+hdr_size); +} + +static ssize_t proxy_pack_raw(ECPConnection *proxy, ECPNetAddr *addr, unsigned char *packet, size_t pkt_size, unsigned char s_idx, unsigned char c_idx, ecp_dh_public_t *public, ecp_aead_key_t *shsec, unsigned char *nonce, unsigned char *seq, unsigned char *payload, size_t payload_size) { + ECPContext *ctx = proxy->sock->ctx; + unsigned char payload_[ECP_MAX_PLD]; + ssize_t rv, hdr_size = proxy_set_msg(proxy, payload_, sizeof(payload_), payload, payload_size); + if (hdr_size < 0) return hdr_size; + + rv = ecp_pack(ctx, payload_+hdr_size, ECP_MAX_PLD-hdr_size, s_idx, c_idx, public, shsec, nonce, seq, payload, payload_size); + if (rv < 0) return rv; + + return ecp_proxy_pack(proxy, addr, packet, ECP_MAX_PKT, ECP_ECDH_IDX_INV, ECP_ECDH_IDX_INV, payload_, rv+hdr_size); +} + +int ecp_proxy_init(ECPContext *ctx) { + int rv; + + rv = ecp_conn_handler_init(&handler_f); + if (rv) return rv; + + handler_f.conn_create = proxyf_create; + handler_f.conn_destroy = proxyf_destroy; + handler_f.conn_open = proxyf_open; + handler_f.msg[ECP_MTYPE_OPEN] = proxyf_handle_open; + handler_f.msg[ECP_MTYPE_RELAY] = proxyf_handle_relay; + ctx->handler[ECP_CTYPE_PROXYF] = &handler_f; + + rv = ecp_conn_handler_init(&handler_b); + if (rv) return rv; + handler_b.conn_create = proxyb_create; + handler_b.conn_destroy = proxyb_destroy; + handler_b.conn_open = proxyb_open; + handler_b.msg[ECP_MTYPE_OPEN] = proxyb_handle_open; + handler_b.msg[ECP_MTYPE_RELAY] = proxyb_handle_relay; + ctx->handler[ECP_CTYPE_PROXYB] = &handler_b; + + ctx->pr.init = 1; + ctx->pr.pack = proxy_pack; + ctx->pr.pack_raw = proxy_pack_raw; + +#ifdef ECP_WITH_PTHREAD + pthread_mutex_init(&key_next_mutex, NULL); + pthread_mutex_init(&key_next_mutex, NULL); +#endif + + if (ctx->ht.init) { + key_perma_table = ctx->ht.create(ctx); + key_next_table = ctx->ht.create(ctx); + } + + return ECP_OK; +} + +int ecp_conn_proxy_init(ECPConnection *conn, ECPNode *conn_node, ECPConnProxy *proxy[], ECPNode *proxy_node[], int size, ECPSocket *sock) { + int i, rv; + + rv = ecp_conn_init(conn, conn_node); + if (rv) return rv; + + conn->proxy = (ECPConnection *)proxy[size-1]; + for (i=0; i<size; i++) { + rv = ecp_conn_create((ECPConnection *)proxy[i], sock, ECP_CTYPE_PROXYF); + if (rv) return rv; + + rv = ecp_conn_init((ECPConnection *)proxy[i], proxy_node[i]); + if (rv) return rv; + + if (i == 0) { + proxy[i]->b.proxy = NULL; + } else { + proxy[i]->b.proxy = (ECPConnection *)proxy[i-1]; + } + if (i == size-1) { + proxy[i]->next = conn; + } else { + proxy[i]->next = (ECPConnection *)proxy[i+1]; + } + } + + return ECP_OK; +} + |