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@@ -515,8 +515,11 @@ connection_ext_or_process_inbuf(or_connection_t *or_conn)
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/* If the transport proxy did not use the TRANSPORT command to
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* specify the transport name, mark this as unknown transport. */
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- if (!or_conn->ext_or_transport)
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- or_conn->ext_or_transport = tor_strdup("<?\?>");
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+ if (!or_conn->ext_or_transport) {
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+ /* We write this string this way to avoid ??>, which is a C
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+ * trigraph. */
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+ or_conn->ext_or_transport = tor_strdup("<?" "?>");
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+ }
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connection_write_ext_or_command(conn, EXT_OR_CMD_BT_OKAY, NULL, 0);
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