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378 lines
11 KiB
378 lines
11 KiB
// -*-go-*-
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package sip
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import (
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"bytes"
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"errors"
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"fmt"
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"github.com/jart/gosip/sdp"
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)
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%% machine msg;
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%% write data;
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// ParseMsg turns a a SIP message into a data structure.
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func ParseMsg(s string) (msg *Msg, err error) {
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if s == "" {
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return nil, errors.New("Empty SIP message")
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}
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return ParseMsgBytes([]byte(s))
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}
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// ParseMsg turns a a SIP message byte slice into a data structure.
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func ParseMsgBytes(data []byte) (msg *Msg, err error) {
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if data == nil {
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return nil, nil
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}
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msg = new(Msg)
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viap := &msg.Via
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routep := &msg.Route
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rroutep := &msg.RecordRoute
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contactp := &msg.Contact
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cs := 0
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p := 0
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pe := len(data)
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eof := len(data)
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//stack := make([]int, 2)
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//top := 0
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line := 1
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linep := 0
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buf := make([]byte, len(data))
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amt := 0
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mark := 0
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clen := 0
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ctype := ""
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var b1 string
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var hex byte
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var dest *string
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%%{
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action break {
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fbreak;
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}
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action mark {
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mark = p
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}
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action start {
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amt = 0
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}
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action append {
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buf[amt] = fc
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amt++
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}
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action collapse {
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amt = appendCollapse(buf, amt, fc)
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}
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action hexHi {
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hex = unhex(fc) * 16
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}
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action hexLo {
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hex += unhex(fc)
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buf[amt] = hex
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amt++
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}
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action lower {
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amt = appendLower(buf, amt, fc)
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}
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action Method {
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msg.Method = string(data[mark:p])
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}
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action VersionMajor {
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msg.VersionMajor = msg.VersionMajor * 10 + (fc - 0x30)
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}
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action VersionMinor {
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msg.VersionMinor = msg.VersionMinor * 10 + (fc - 0x30)
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}
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action RequestURI {
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msg.Request, err = ParseURIBytes(data[mark:p])
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if err != nil { return nil, err }
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}
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action StatusCode {
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msg.Status = msg.Status * 10 + (int(fc) - 0x30)
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}
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action ReasonPhrase {
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msg.Phrase = string(buf[0:amt])
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}
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action header {
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fgoto header;
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}
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action hname {
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b1 = string(bytes.ToLower(data[mark:p]))
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}
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action svalue {
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fhold;
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fgoto svalue;
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}
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action svalueDone {{
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b := data[mark:p - 1]
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if dest != nil {
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*dest = string(b)
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} else {
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if msg.Headers == nil {
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msg.Headers = Headers{}
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}
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msg.Headers[b1] = string(b)
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}
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}}
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action xheader {
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dest = nil;
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fhold;
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fgoto xheader;
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}
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action CallID {
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msg.CallID = string(data[mark:p])
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}
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action Contact {
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*contactp, err = ParseAddr(string(data[mark:p]))
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if err != nil { return nil, err }
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for *contactp != nil { contactp = &(*contactp).Next }
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}
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action ContentLength {
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clen = clen * 10 + (int(fc) - 0x30)
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}
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action ContentType {
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ctype = string(data[mark:p])
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}
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action CSeq {
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msg.CSeq = msg.CSeq * 10 + (int(fc) - 0x30)
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}
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action CSeqMethod {
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msg.CSeqMethod = string(data[mark:p])
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}
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action Expires {
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msg.Expires = msg.Expires * 10 + (int(fc) - 0x30)
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}
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action From {
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msg.From, err = ParseAddr(string(data[mark:p]))
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if err != nil { return nil, err }
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}
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action MaxForwards {
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msg.MaxForwards = msg.MaxForwards * 10 + (int(fc) - 0x30)
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}
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action MinExpires {
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msg.MinExpires = msg.MinExpires * 10 + (int(fc) - 0x30)
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}
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action PAssertedIdentity {
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msg.PAssertedIdentity, err = ParseAddr(string(data[mark:p]))
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if err != nil { return nil, err }
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}
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action RecordRoute {
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*rroutep, err = ParseAddr(string(data[mark:p]))
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if err != nil { return nil, err }
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for *rroutep != nil { rroutep = &(*rroutep).Next }
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}
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action RemotePartyID {
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msg.RemotePartyID, err = ParseAddr(string(data[mark:p]))
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if err != nil { return nil, err }
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}
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action Route {
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*routep, err = ParseAddr(string(data[mark:p]))
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if err != nil { return nil, err }
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for *routep != nil { routep = &(*routep).Next }
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}
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action To {
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msg.To, err = ParseAddr(string(data[mark:p]))
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if err != nil { return nil, err }
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}
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action Via {
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*viap, err = ParseVia(string(data[mark:p]))
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if err != nil { return nil, err }
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for *viap != nil { viap = &(*viap).Next }
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}
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action lookAheadWSP { p + 2 < pe && (data[p+2] == ' ' || data[p+2] == '\t') }
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# https://tools.ietf.org/html/rfc2234
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SP = " ";
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HTAB = "\t";
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CR = "\r";
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LF = "\n" @{ line++; linep = p; };
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CRLF = CR LF;
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WSP = SP | HTAB;
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LWS = ( WSP* ( CR when lookAheadWSP ) LF )? WSP+;
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SWS = LWS?;
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UTF8_CONT = 0x80..0xBF;
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UTF8_NONASCII = 0xC0..0xDF UTF8_CONT {1}
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| 0xE0..0xEF UTF8_CONT {2}
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| 0xF0..0xF7 UTF8_CONT {3}
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| 0xF8..0xFb UTF8_CONT {4}
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| 0xFC..0xFD UTF8_CONT {5};
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UTF8 = 0x21..0x7F | UTF8_NONASCII;
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UTF8_TRIM = ( UTF8+ (LWS* UTF8)* ) >start @collapse;
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# https://tools.ietf.org/html/rfc3261#section-25.1
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reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" | "$" | "," ;
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mark = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")" ;
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unreserved = alpha | digit | mark ;
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tokenc = alpha | digit | "-" | "." | "!" | "%" | "*" | "_"
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| "+" | "`" | "'" | "~" ;
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separators = "(" | ")" | "<" | ">" | "@" | "," | ";" | ":" | "\\"
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| "\"" | "/" | "[" | "]" | "?" | "=" | "{" | "}" | SP
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| HTAB ;
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wordc = alpha | digit | "-" | "." | "!" | "%" | "*" | "_"
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| "+" | "`" | "'" | "~" | "(" | ")" | "<" | ">" | ":"
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| "\\" | "\"" | "/" | "[" | "]" | "?" | "{" | "}" ;
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word = wordc+ ;
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STAR = SWS "*" SWS ;
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SLASH = SWS "/" SWS ;
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EQUAL = SWS "=" SWS ;
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LPAREN = SWS "(" SWS ;
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RPAREN = SWS ")" SWS ;
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RAQUOT = ">" SWS ;
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LAQUOT = SWS "<" ;
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COMMA = SWS "," SWS ;
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SEMI = SWS ";" SWS ;
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COLON = SWS ":" SWS ;
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HCOLON = WSP* ":" SWS ;
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LDQUOT = SWS "\"" ;
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RDQUOT = "\"" SWS ;
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ctext = 0x21..0x27 | 0x2A..0x5B | 0x5D..0x7E | UTF8_NONASCII | LWS ;
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quoted_pair = "\\" ( 0x00..0x09 | 0x0B..0x0C | 0x0E..0x7F ) ;
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comment = LPAREN ( ctext | quoted_pair )* <: RPAREN ; # TODO(jart): Nested parens
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qdtext = LWS | 0x21 | 0x23..0x5B | 0x5D..0x7E | UTF8_NONASCII ;
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quoted_string = SWS "\"" ( qdtext | quoted_pair )* <: "\"" ;
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escaped = "%" ( xdigit @hexHi ) ( xdigit @hexLo ) ;
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uric = reserved | unreserved | escaped ;
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uric_no_slash = unreserved | escaped | ";" | "?" | ":" | "@" | "&" | "="
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| "+" | "$" | "," ;
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token = tokenc+ >mark ;
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reasonc = reserved | unreserved | UTF8_NONASCII | SP | HTAB ;
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reasonmc = escaped | ( reasonc @append ) ;
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cid = word ( "@" word )? ;
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Method = token %Method;
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SIPVersionNo = digit+ @VersionMajor "." digit+ @VersionMinor;
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RequestURI = ^SP+ >mark %RequestURI;
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StatusCode = ( digit @StatusCode ) {3};
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ReasonPhrase = reasonmc+ >start %ReasonPhrase;
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hval = ( UTF8 | LWS )* >mark;
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cheader = ("Call-ID"i | "i"i) HCOLON cid >mark %CallID
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| ("Contact"i | "m"i) HCOLON <: hval %Contact
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| ("Content-Length"i | "l"i) HCOLON digit+ >{clen=0} @ContentLength
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| ("Content-Type"i | "c"i) HCOLON <: hval %ContentType
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| "CSeq"i HCOLON (digit+ @CSeq) LWS token %CSeqMethod
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| ("Expires"i | "l"i) HCOLON digit+ >{msg.Expires=0} @Expires
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| ("From"i | "f"i) HCOLON <: hval %From
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| ("Max-Forwards"i | "l"i) HCOLON digit+ >{msg.MaxForwards=0} @MaxForwards
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| ("Min-Expires"i | "l"i) HCOLON digit+ >{msg.MinExpires=0} @MinExpires
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| "P-Asserted-Identity"i HCOLON <: hval %PAssertedIdentity
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| "Record-Route"i HCOLON <: hval %RecordRoute
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| "Remote-Party-ID"i HCOLON <: hval %RemotePartyID
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| "Route"i HCOLON <: hval %Route
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| ("To"i | "t"i) HCOLON <: hval %To
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| ("Via"i | "v"i) HCOLON <: hval %Via
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;
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sname = "Accept"i %{dest=&msg.Accept}
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| ("Accept-Contact"i | "a"i) %{dest=&msg.AcceptContact}
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| "Accept-Encoding"i %{dest=&msg.AcceptEncoding}
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| "Accept-Language"i %{dest=&msg.AcceptLanguage}
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| ("Allow"i | "u"i) %{dest=&msg.Allow}
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| ("Allow-Events"i | "u"i) %{dest=&msg.AllowEvents}
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| "Alert-Info"i %{dest=&msg.AlertInfo}
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| "Authentication-Info"i %{dest=&msg.AuthenticationInfo}
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| "Authorization"i %{dest=&msg.Authorization}
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| "Content-Disposition"i %{dest=&msg.ContentDisposition}
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| "Content-Language"i %{dest=&msg.ContentLanguage}
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| ("Content-Encoding"i | "e"i) %{dest=&msg.ContentEncoding}
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| "Call-Info"i %{dest=&msg.CallInfo}
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| "Date"i %{dest=&msg.Date}
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| "Error-Info"i %{dest=&msg.ErrorInfo}
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| ("Event"i | "o"i) %{dest=&msg.Event}
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| "In-Reply-To"i %{dest=&msg.InReplyTo}
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| "Reply-To"i %{dest=&msg.ReplyTo}
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| "MIME-Version"i %{dest=&msg.MIMEVersion}
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| "Organization"i %{dest=&msg.Organization}
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| "Priority"i %{dest=&msg.Priority}
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| "Proxy-Authenticate"i %{dest=&msg.ProxyAuthenticate}
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| "Proxy-Authorization"i %{dest=&msg.ProxyAuthorization}
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| "Proxy-Require"i %{dest=&msg.ProxyRequire}
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| ("Refer-To"i | "r"i) %{dest=&msg.ReferTo}
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| ("Referred-By"i | "b"i) %{dest=&msg.ReferredBy}
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| "Require"i %{dest=&msg.Require}
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| "Retry-After"i %{dest=&msg.RetryAfter}
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| "Server"i %{dest=&msg.Server}
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| ("Subject"i | "s"i) %{dest=&msg.Subject}
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| ("Supported"i | "k"i) %{dest=&msg.Supported}
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| "Timestamp"i %{dest=&msg.Timestamp}
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| "Unsupported"i %{dest=&msg.Unsupported}
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| "User-Agent"i %{dest=&msg.UserAgent}
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| "Warning"i %{dest=&msg.Warning}
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| "WWW-Authenticate"i %{dest=&msg.WWWAuthenticate}
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;
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svalue := hval CR LF @svalueDone @header;
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xheader := token %hname HCOLON <: any @svalue;
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header := CR LF @break
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| cheader CR LF @header
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| sname >mark @err(xheader) HCOLON <: any @svalue
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;
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SIPVersion = "SIP/" SIPVersionNo;
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Request = Method SP RequestURI SP SIPVersion CR LF @header;
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Response = SIPVersion SP StatusCode SP ReasonPhrase CR LF @header;
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main := Request | Response;
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write init;
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write exec;
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}%%
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if cs < msg_first_final {
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if p == pe {
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return nil, errors.New(fmt.Sprintf("Incomplete SIP message: %s", data))
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} else {
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return nil, errors.New(fmt.Sprintf("Error in SIP message at line %d offset %d:\n%s", line, p - linep, data))
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}
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}
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if clen > 0 {
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if clen != len(data) - p {
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return nil, errors.New(fmt.Sprintf("Content-Length incorrect: %d != %d", clen, len(data) - p))
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}
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if ctype == sdp.ContentType {
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ms, err := sdp.Parse(string(data[p:len(data)]))
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if err != nil { return nil, err }
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msg.Payload = ms
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} else {
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msg.Payload = &MiscPayload{T: ctype, D: data[p:len(data)]}
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}
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}
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return msg, nil
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}
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