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Encode Circuit ID as src IP in Proxy Protocol for Opportunistic Onions

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This commit is contained in:
Mahrud Sayrafi 2018-07-30 16:10:23 -07:00 committed by George Kadianakis
parent 0dbd4fe309
commit be142194cd
1 changed files with 23 additions and 0 deletions
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23
src/core/or/connection_edge.c
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@ -617,6 +617,29 @@ connection_edge_finished_connecting(edge_connection_t *edge_conn)
rep_hist_note_exit_stream_opened(conn->port);
conn->state = EXIT_CONN_STATE_OPEN;
/* Include Proxy Protocol header. */
char buf[512];
char dst_ipv6[39] = "::1";
/* See RFC4193 regarding fc00::/7 */
char src_ipv6_prefix[34] = "fc00:dead:beef:4dad:";
/* TODO: retain virtual port and use as destination port */
uint16_t dst_port = 443;
uint16_t src_port = 0;
uint32_t gid = 0;
if (edge_conn->on_circuit != NULL) {
gid = TO_ORIGIN_CIRCUIT(edge_conn->on_circuit)->global_identifier;
src_port = gid & 0x0000ffff;
}
gid = (gid == 0) ? 1 : gid;
src_port = (src_port == 0) ? 1 : src_port;
tor_snprintf(buf, sizeof(buf), "PROXY TCP6 %s:%x %s %d %d\r\n",
src_ipv6_prefix, gid, dst_ipv6, src_port, dst_port);
connection_buf_add(buf, strlen(buf), conn);
connection_watch_events(conn, READ_EVENT); /* stop writing, keep reading */
if (connection_get_outbuf_len(conn)) /* in case there are any queued relay
* cells */