rtc_stun/
attributes.rs

1#[cfg(test)]
2mod attributes_test;
3
4use crate::message::*;
5use shared::error::*;
6
7use std::fmt;
8
9/// Attributes is list of message attributes.
10#[derive(Default, PartialEq, Eq, Debug, Clone)]
11pub struct Attributes(pub Vec<RawAttribute>);
12
13impl Attributes {
14    /// get returns first attribute from list by the type.
15    /// If attribute is present the RawAttribute is returned and the
16    /// boolean is true. Otherwise the returned RawAttribute will be
17    /// empty and boolean will be false.
18    pub fn get(&self, t: AttrType) -> (RawAttribute, bool) {
19        for candidate in &self.0 {
20            if candidate.typ == t {
21                return (candidate.clone(), true);
22            }
23        }
24
25        (RawAttribute::default(), false)
26    }
27}
28
29/// AttrType is attribute type.
30#[derive(PartialEq, Debug, Eq, Default, Copy, Clone)]
31pub struct AttrType(pub u16);
32
33impl fmt::Display for AttrType {
34    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
35        let other = format!("0x{:x}", self.0);
36
37        let s = match *self {
38            ATTR_MAPPED_ADDRESS => "MAPPED-ADDRESS",
39            ATTR_USERNAME => "USERNAME",
40            ATTR_ERROR_CODE => "ERROR-CODE",
41            ATTR_MESSAGE_INTEGRITY => "MESSAGE-INTEGRITY",
42            ATTR_UNKNOWN_ATTRIBUTES => "UNKNOWN-ATTRIBUTES",
43            ATTR_REALM => "REALM",
44            ATTR_NONCE => "NONCE",
45            ATTR_XORMAPPED_ADDRESS => "XOR-MAPPED-ADDRESS",
46            ATTR_SOFTWARE => "SOFTWARE",
47            ATTR_ALTERNATE_SERVER => "ALTERNATE-SERVER",
48            ATTR_FINGERPRINT => "FINGERPRINT",
49            ATTR_PRIORITY => "PRIORITY",
50            ATTR_USE_CANDIDATE => "USE-CANDIDATE",
51            ATTR_ICE_CONTROLLED => "ICE-CONTROLLED",
52            ATTR_ICE_CONTROLLING => "ICE-CONTROLLING",
53            ATTR_CHANNEL_NUMBER => "CHANNEL-NUMBER",
54            ATTR_LIFETIME => "LIFETIME",
55            ATTR_XOR_PEER_ADDRESS => "XOR-PEER-ADDRESS",
56            ATTR_DATA => "DATA",
57            ATTR_XOR_RELAYED_ADDRESS => "XOR-RELAYED-ADDRESS",
58            ATTR_EVEN_PORT => "EVEN-PORT",
59            ATTR_REQUESTED_TRANSPORT => "REQUESTED-TRANSPORT",
60            ATTR_DONT_FRAGMENT => "DONT-FRAGMENT",
61            ATTR_RESERVATION_TOKEN => "RESERVATION-TOKEN",
62            ATTR_CONNECTION_ID => "CONNECTION-ID",
63            ATTR_REQUESTED_ADDRESS_FAMILY => "REQUESTED-ADDRESS-FAMILY",
64            ATTR_MESSAGE_INTEGRITY_SHA256 => "MESSAGE-INTEGRITY-SHA256",
65            ATTR_PASSWORD_ALGORITHM => "PASSWORD-ALGORITHM",
66            ATTR_USER_HASH => "USERHASH",
67            ATTR_PASSWORD_ALGORITHMS => "PASSWORD-ALGORITHMS",
68            ATTR_ALTERNATE_DOMAIN => "ALTERNATE-DOMAIN",
69            _ => other.as_str(),
70        };
71
72        write!(f, "{s}")
73    }
74}
75
76impl AttrType {
77    /// required returns true if type is from comprehension-required range (0x0000-0x7FFF).
78    pub fn required(&self) -> bool {
79        self.0 <= 0x7FFF
80    }
81
82    /// optional returns true if type is from comprehension-optional range (0x8000-0xFFFF).
83    pub fn optional(&self) -> bool {
84        self.0 >= 0x8000
85    }
86
87    /// value returns uint16 representation of attribute type.
88    pub fn value(&self) -> u16 {
89        self.0
90    }
91}
92
93/// Attributes from comprehension-required range (0x0000-0x7FFF).
94pub const ATTR_MAPPED_ADDRESS: AttrType = AttrType(0x0001); // MAPPED-ADDRESS
95pub const ATTR_USERNAME: AttrType = AttrType(0x0006); // USERNAME
96pub const ATTR_MESSAGE_INTEGRITY: AttrType = AttrType(0x0008); // MESSAGE-INTEGRITY
97pub const ATTR_ERROR_CODE: AttrType = AttrType(0x0009); // ERROR-CODE
98pub const ATTR_UNKNOWN_ATTRIBUTES: AttrType = AttrType(0x000A); // UNKNOWN-ATTRIBUTES
99pub const ATTR_REALM: AttrType = AttrType(0x0014); // REALM
100pub const ATTR_NONCE: AttrType = AttrType(0x0015); // NONCE
101pub const ATTR_XORMAPPED_ADDRESS: AttrType = AttrType(0x0020); // XOR-MAPPED-ADDRESS
102
103/// Attributes from comprehension-optional range (0x8000-0xFFFF).
104pub const ATTR_SOFTWARE: AttrType = AttrType(0x8022); // SOFTWARE
105pub const ATTR_ALTERNATE_SERVER: AttrType = AttrType(0x8023); // ALTERNATE-SERVER
106pub const ATTR_FINGERPRINT: AttrType = AttrType(0x8028); // FINGERPRINT
107
108/// Attributes from RFC 5245 ICE.
109pub const ATTR_PRIORITY: AttrType = AttrType(0x0024); // PRIORITY
110pub const ATTR_USE_CANDIDATE: AttrType = AttrType(0x0025); // USE-CANDIDATE
111pub const ATTR_ICE_CONTROLLED: AttrType = AttrType(0x8029); // ICE-CONTROLLED
112pub const ATTR_ICE_CONTROLLING: AttrType = AttrType(0x802A); // ICE-CONTROLLING
113pub const ATTR_NETWORK_COST: AttrType = AttrType(0xC057); // NETWORK-COST
114
115/// Attributes from RFC 5766 TURN.
116pub const ATTR_CHANNEL_NUMBER: AttrType = AttrType(0x000C); // CHANNEL-NUMBER
117pub const ATTR_LIFETIME: AttrType = AttrType(0x000D); // LIFETIME
118pub const ATTR_XOR_PEER_ADDRESS: AttrType = AttrType(0x0012); // XOR-PEER-ADDRESS
119pub const ATTR_DATA: AttrType = AttrType(0x0013); // DATA
120pub const ATTR_XOR_RELAYED_ADDRESS: AttrType = AttrType(0x0016); // XOR-RELAYED-ADDRESS
121pub const ATTR_EVEN_PORT: AttrType = AttrType(0x0018); // EVEN-PORT
122pub const ATTR_REQUESTED_TRANSPORT: AttrType = AttrType(0x0019); // REQUESTED-TRANSPORT
123pub const ATTR_DONT_FRAGMENT: AttrType = AttrType(0x001A); // DONT-FRAGMENT
124pub const ATTR_RESERVATION_TOKEN: AttrType = AttrType(0x0022); // RESERVATION-TOKEN
125
126/// Attributes from RFC 5780 NAT Behavior Discovery
127pub const ATTR_CHANGE_REQUEST: AttrType = AttrType(0x0003); // CHANGE-REQUEST
128pub const ATTR_PADDING: AttrType = AttrType(0x0026); // PADDING
129pub const ATTR_RESPONSE_PORT: AttrType = AttrType(0x0027); // RESPONSE-PORT
130pub const ATTR_CACHE_TIMEOUT: AttrType = AttrType(0x8027); // CACHE-TIMEOUT
131pub const ATTR_RESPONSE_ORIGIN: AttrType = AttrType(0x802b); // RESPONSE-ORIGIN
132pub const ATTR_OTHER_ADDRESS: AttrType = AttrType(0x802C); // OTHER-ADDRESS
133
134/// Attributes from RFC 3489, removed by RFC 5389,
135///  but still used by RFC5389-implementing software like Vovida.org, reTURNServer, etc.
136pub const ATTR_SOURCE_ADDRESS: AttrType = AttrType(0x0004); // SOURCE-ADDRESS
137pub const ATTR_CHANGED_ADDRESS: AttrType = AttrType(0x0005); // CHANGED-ADDRESS
138
139/// Attributes from RFC 6062 TURN Extensions for TCP Allocations.
140pub const ATTR_CONNECTION_ID: AttrType = AttrType(0x002a); // CONNECTION-ID
141
142/// Attributes from RFC 6156 TURN IPv6.
143pub const ATTR_REQUESTED_ADDRESS_FAMILY: AttrType = AttrType(0x0017); // REQUESTED-ADDRESS-FAMILY
144
145/// Attributes from An Origin Attribute for the STUN Protocol.
146pub const ATTR_ORIGIN: AttrType = AttrType(0x802F);
147
148/// Attributes from RFC 8489 STUN.
149pub const ATTR_MESSAGE_INTEGRITY_SHA256: AttrType = AttrType(0x001C); // MESSAGE-INTEGRITY-SHA256
150pub const ATTR_PASSWORD_ALGORITHM: AttrType = AttrType(0x001D); // PASSWORD-ALGORITHM
151pub const ATTR_USER_HASH: AttrType = AttrType(0x001E); // USER-HASH
152pub const ATTR_PASSWORD_ALGORITHMS: AttrType = AttrType(0x8002); // PASSWORD-ALGORITHMS
153pub const ATTR_ALTERNATE_DOMAIN: AttrType = AttrType(0x8003); // ALTERNATE-DOMAIN
154
155/// RawAttribute is a Type-Length-Value (TLV) object that
156/// can be added to a STUN message. Attributes are divided into two
157/// types: comprehension-required and comprehension-optional.  STUN
158/// agents can safely ignore comprehension-optional attributes they
159/// don't understand, but cannot successfully process a message if it
160/// contains comprehension-required attributes that are not
161/// understood.
162#[derive(Default, Debug, Clone, PartialEq, Eq)]
163pub struct RawAttribute {
164    pub typ: AttrType,
165    pub length: u16, // ignored while encoding
166    pub value: Vec<u8>,
167}
168
169impl fmt::Display for RawAttribute {
170    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
171        write!(f, "{}: {:?}", self.typ, self.value)
172    }
173}
174
175impl Setter for RawAttribute {
176    /// add_to implements Setter, adding attribute as a.Type with a.Value and ignoring
177    /// the Length field.
178    fn add_to(&self, m: &mut Message) -> Result<()> {
179        m.add(self.typ, &self.value);
180        Ok(())
181    }
182}
183
184pub(crate) const PADDING: usize = 4;
185
186/// STUN aligns attributes on 32-bit boundaries, attributes whose content
187/// is not a multiple of 4 bytes are padded with 1, 2, or 3 bytes of
188/// padding so that its value contains a multiple of 4 bytes.  The
189/// padding bits are ignored, and may be any value.
190///
191/// https://tools.ietf.org/html/rfc5389#section-15
192pub(crate) fn nearest_padded_value_length(l: usize) -> usize {
193    let mut n = PADDING * (l / PADDING);
194    if n < l {
195        n += PADDING
196    }
197    n
198}
199
200/// This method converts uint16 vlue to AttrType. If it finds an old attribute
201/// type value, it also translates it to the new value to enable backward
202/// compatibility. (See: https://github.com/pion/stun/issues/21)
203pub(crate) fn compat_attr_type(val: u16) -> AttrType {
204    if val == 0x8020 {
205        // draft-ietf-behave-rfc3489bis-02, MS-TURN
206        ATTR_XORMAPPED_ADDRESS // new: 0x0020 (from draft-ietf-behave-rfc3489bis-03 on)
207    } else {
208        AttrType(val)
209    }
210}
rtc_stun/attributes.rs

rtc_stun/
attributes.rs
