250 lines
6.9 KiB
BNF
250 lines
6.9 KiB
BNF
; BNF from RFC 2327
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announcement = proto-version
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origin-field
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session-name-field
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information-field
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uri-field
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email-fields
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phone-fields
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connection-field
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bandwidth-fields
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time-fields
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key-field
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attribute-fields
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media-descriptions
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proto-version = "v=" 1*DIGIT CRLF
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;this memo describes version 0
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origin-field = "o=" username space
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sess-id space sess-version space
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nettype space addrtype space
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addr CRLF
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session-name-field = "s=" text CRLF
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information-field = ["i=" text CRLF]
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uri-field = ["u=" uri CRLF]
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email-fields = *("e=" email-address CRLF)
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phone-fields = *("p=" phone-number CRLF)
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connection-field = ["c=" nettype space addrtype space
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connection-address CRLF]
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;a connection field must be present
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;in every media description or at the
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;session-level
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bandwidth-fields = *("b=" bwtype ":" bandwidth CRLF)
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time-fields = 1*( "t=" start-time space stop-time
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*(CRLF repeat-fields) CRLF)
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[zone-adjustments CRLF]
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repeat-fields = "r=" repeat-interval space typed-time
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1*(space typed-time)
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zone-adjustments = "z=" time space ["-"] typed-time
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*(space time space ["-"] typed-time)
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key-field = ["k=" key-type CRLF]
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key-type = "prompt" |
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"clear:" key-data |
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"base64:" key-data |
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"uri:" uri
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key-data = email-safe | "~" | "
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attribute-fields = *("a=" attribute CRLF)
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media-descriptions = *( media-field
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information-field
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*(connection-field)
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bandwidth-fields
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key-field
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attribute-fields )
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media-field = "m=" media space port ["/" integer]
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space proto 1*(space fmt) CRLF
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media = 1*(alpha-numeric)
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;typically "audio", "video", "application"
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;or "data"
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fmt = 1*(alpha-numeric)
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;typically an RTP payload type for audio
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;and video media
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proto = 1*(alpha-numeric | "/") ; PPe
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;typically "RTP/AVP" or "udp" for IP4
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port = 1*(DIGIT)
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;should in the range "1024" to "65535" inclusive
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;for UDP based media
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attribute = (att-field ":" att-value) | att-field
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att-field = 1*(alpha-numeric)
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att-value = byte-string
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sess-id = 1*(DIGIT)
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;should be unique for this originating username/host
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sess-version = 1*(DIGIT)
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;0 is a new session
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connection-address = multicast-address
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| addr
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multicast-address = 3*(decimal-uchar ".") decimal-uchar "/" ttl
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[ "/" integer ]
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;multicast addresses may be in the range
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;224.0.0.0 to 239.255.255.255
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ttl = decimal-uchar
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start-time = time | "0"
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stop-time = time | "0"
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time = POS-DIGIT 9*(DIGIT)
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;sufficient for 2 more centuries
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repeat-interval = typed-time
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typed-time = 1*(DIGIT) [fixed-len-time-unit]
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fixed-len-time-unit = "d" | "h" | "m" | "s"
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bwtype = 1*(alpha-numeric)
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bandwidth = 1*(DIGIT)
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username = safe
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;pretty wide definition, but doesn't include space
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email-address = email | email "(" email-safe ")" |
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email-safe "<" email ">"
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email = ;defined in RFC822
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uri= ;defined in RFC1630
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phone-number = phone | phone "(" email-safe ")" |
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email-safe "<" phone ">"
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phone = "+" POS-DIGIT 1*(space | "-" | DIGIT)
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;there must be a space or hyphen between the
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;international code and the rest of the number.
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nettype = "IN"
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;list to be extended
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addrtype = "IP4" | "IP6"
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;list to be extended
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addr = FQDN | unicast-address
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FQDN = 4*(alpha-numeric|"-"|".")
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;fully qualified domain name as specified in RFC1035
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unicast-address = IP4-address | IP6-address
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IP4-address = b1 "." decimal-uchar "." decimal-uchar "." b4
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b1 = decimal-uchar
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;less than "224"; not "0" or "127"
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b4 = decimal-uchar
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;not "0"
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IP6-address = ;to be defined
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text = byte-string
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;default is to interpret this as IS0-10646 UTF8
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;ISO 8859-1 requires a "a=charset:ISO-8859-1"
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;session-level attribute to be used
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byte-string = 1*(0x01..0x09|0x0b|0x0c|0x0e..0xff)
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;any byte except NUL, CR or LF
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decimal-uchar = DIGIT
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| POS-DIGIT DIGIT
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| ("1" 2*(DIGIT))
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| ("2" ("0"|"1"|"2"|"3"|"4") DIGIT)
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| ("2" "5" ("0"|"1"|"2"|"3"|"4"|"5"))
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integer = POS-DIGIT *(DIGIT)
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alpha-numeric = ALPHA | DIGIT
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DIGIT = "0" | POS-DIGIT
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POS-DIGIT = "1"|"2"|"3"|"4"|"5"|"6"|"7"|"8"|"9"
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ALPHA = "a"|"b"|"c"|"d"|"e"|"f"|"g"|"h"|"i"|"j"|"k"|
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"l"|"m"|"n"|"o "|"p"|"q"|"r"|"s"|"t"|"u"|"v"|
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"w"|"x"|"y"|"z"|"A"|"B"|"C "|"D"|"E"|"F"|"G"|
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"H"|"I"|"J"|"K"|"L"|"M"|"N"|"O"|"P"|" Q"|"R"|
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"S"|"T"|"U"|"V"|"W"|"X"|"Y"|"Z"
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email-safe = safe | space | tab
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safe = alpha-numeric |
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"'" | "'" | "-" | "." | "/" | ":" | "?" | """ |
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"#" | "$" | "&" | "*" | ";" | "=" | "@" | "[" |
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"]" | "^" | "_" | "`" | "{" | "|" | "}" | "+" |
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"~" | "
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space = %d32
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tab = %d9
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CRLF = %d13.10
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