11 #include <dnscrypt/plugin.h>
12 #include <ldns/ldns.h>
14 DCPLUGIN_MAIN(__FILE__
);
16 #define EDNS_HEADER "0004000f4f70656e444e53"
17 #define EDNS_DEV_ID "cafebabedeadbeef"
20 dcplugin_description(DCPlugin
* const dcplugin
)
22 return "Add an OpenDNS device identifier to outgoing queries";
26 dcplugin_long_description(DCPlugin
* const dcplugin
)
29 "This plugin tags outgoing packets with a 64-bit shared secret key,\n"
30 "that the OpenDNS Umbrella service uses to identify users.\n"
32 "If you happen to have an OpenDNS Umbrella account,\n"
33 "your secret key ('device') can be retrieved with:\n"
35 "$ dig txt debug.opendns.com\n"
37 "# env OPENDNS_DEVICE_ID='<device id>' dnscrypt-proxy --plugin \n"
38 " libdcplugin_example_ldns_opendns_deviceid.la";
42 dcplugin_init(DCPlugin
* const dcplugin
, int argc
, char *argv
[])
47 size_t edns_hex_size
= sizeof EDNS_HEADER EDNS_DEV_ID
;
49 edns_hex
= malloc(sizeof EDNS_HEADER EDNS_DEV_ID
);
50 dcplugin_set_user_data(dcplugin
, edns_hex
);
51 if (edns_hex
== NULL
) {
54 memcpy(edns_hex
, EDNS_HEADER EDNS_DEV_ID
, edns_hex_size
);
55 assert(sizeof EDNS_DEV_ID
- 1U == (size_t) 16U);
56 device_id
= device_id_env
= getenv("OPENDNS_DEVICE_ID");
57 if (device_id
!= NULL
) {
58 memcpy(edns_hex
+ sizeof EDNS_HEADER
- (size_t) 1U,
59 device_id
, sizeof EDNS_DEV_ID
);
61 if (device_id_env
!= NULL
) {
62 memset(device_id_env
, 0, strlen(device_id_env
));
68 dcplugin_destroy(DCPlugin
*dcplugin
)
70 free(dcplugin_get_user_data(dcplugin
));
75 DCPluginSyncFilterResult
76 dcplugin_sync_pre_filter(DCPlugin
*dcplugin
, DCPluginDNSPacket
*dcp_packet
)
81 size_t new_packet_size
;
83 ldns_wire2pkt(&packet
, dcplugin_get_wire_data(dcp_packet
),
84 dcplugin_get_wire_data_len(dcp_packet
));
86 edns_data
= ldns_rdf_new_frm_str(LDNS_RDF_TYPE_HEX
,
87 dcplugin_get_user_data(dcplugin
));
88 ldns_pkt_set_edns_data(packet
, edns_data
);
90 ldns_pkt2wire(&new_packet
, packet
, &new_packet_size
);
91 if (dcplugin_get_wire_data_max_len(dcp_packet
) >= new_packet_size
) {
92 dcplugin_set_wire_data(dcp_packet
, new_packet
, new_packet_size
);
96 ldns_pkt_free(packet
);
98 return DCP_SYNC_FILTER_RESULT_OK
;