yahooIM协议头分析

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（一）、长度

20个字节

（二）、各字段长度及其含义

1、固定头“YMSG”：4个字节；

2、版本号：2个字节，本版本填充0x000c；

3、固定填充0x0000，2个字节；

4、Yahoo包发送内容的长度：2个字节，不包括头文件的20个字节；

5、SERVICE类型：2个字节，以下是yahoo协议中定义的服务类型以及对应的数值；

enum yahoo_service { /* these are easier to see in hex */

YAHOO_SERVICE_LOGON = 1,

YAHOO_SERVICE_LOGOFF,

YAHOO_SERVICE_ISAWAY,

YAHOO_SERVICE_ISBACK,

YAHOO_SERVICE_IDLE, /* 5 (placemarker) */

YAHOO_SERVICE_MESSAGE,

YAHOO_SERVICE_IDACT,

YAHOO_SERVICE_IDDEACT,

YAHOO_SERVICE_MAILSTAT,

YAHOO_SERVICE_USERSTAT, /* 0xa */

YAHOO_SERVICE_NEWMAIL,

YAHOO_SERVICE_CHATINVITE,

YAHOO_SERVICE_CALENDAR,

YAHOO_SERVICE_NEWPERSONALMAIL,

YAHOO_SERVICE_NEWCONTACT,

YAHOO_SERVICE_ADDIDENT, /* 0x10 */

YAHOO_SERVICE_ADDIGNORE,

YAHOO_SERVICE_PING,

YAHOO_SERVICE_GOTGROUPRENAME,

YAHOO_SERVICE_SYSMESSAGE = 0x14,

YAHOO_SERVICE_SKINNAME = 0x15,

YAHOO_SERVICE_PASSTHROUGH2 = 0x16,

YAHOO_SERVICE_CONFINVITE = 0x18,

YAHOO_SERVICE_CONFLOGON,

YAHOO_SERVICE_CONFDECLINE,

YAHOO_SERVICE_CONFLOGOFF,

YAHOO_SERVICE_CONFADDINVITE,

YAHOO_SERVICE_CONFMSG,

YAHOO_SERVICE_CHATLOGON,

YAHOO_SERVICE_CHATLOGOFF,

YAHOO_SERVICE_CHATMSG = 0x20,

YAHOO_SERVICE_GAMELOGON = 0x28,

YAHOO_SERVICE_GAMELOGOFF,

YAHOO_SERVICE_GAMEMSG = 0x2a,

YAHOO_SERVICE_FILETRANSFER = 0x46,

YAHOO_SERVICE_VOICECHAT = 0x4A,

YAHOO_SERVICE_NOTIFY = 0x4B,

YAHOO_SERVICE_VERIFY,

YAHOO_SERVICE_P2PFILEXFER,

YAHOO_SERVICE_PEERTOPEER = 0x4F,

YAHOO_SERVICE_WEBCAM,

YAHOO_SERVICE_AUTHRESP = 0x54,

YAHOO_SERVICE_LIST = 0x55,

YAHOO_SERVICE_AUTH = 0x57,

YAHOO_SERVICE_AUTHBUDDY = 0x6d,

YAHOO_SERVICE_ADDBUDDY = 0x83,

YAHOO_SERVICE_REMBUDDY = 0x84,

YAHOO_SERVICE_IGNORECONTACT, /* > 1, 7, 13 < 1, 66, 13, 0*/

YAHOO_SERVICE_REJECTCONTACT,

YAHOO_SERVICE_GROUPRENAME = 0x89, /* > 1, 65(new), 66(0), 67(old) */

YAHOO_SERVICE_CHATONLINE = 0x96, /* > 109(id), 1, 6(abcde) < 0,1*/

YAHOO_SERVICE_CHATGOTO,

YAHOO_SERVICE_CHATJOIN, /* > 1 104-room 129-1600326591 62-2 */

YAHOO_SERVICE_CHATLEAVE,

YAHOO_SERVICE_CHATEXIT = 0x9b,

YAHOO_SERVICE_CHATADDINVITE = 0x9d,

YAHOO_SERVICE_CHATLOGOUT = 0xa0,

YAHOO_SERVICE_CHATPING,

YAHOO_SERVICE_COMMENT = 0xa8,

YAHOO_SERVICE_PRESENCE_PERM = 0xb9,

YAHOO_SERVICE_PRESENCE_SESSION = 0xba,

YAHOO_SERVICE_AVATAR = 0xbc,

YAHOO_SERVICE_PICTURE_CHECKSUM = 0xbd,

YAHOO_SERVICE_PICTURE = 0xbe,

YAHOO_SERVICE_PICTURE_UPDATE = 0xc1,

YAHOO_SERVICE_PICTURE_UPLOAD = 0xc2,

YAHOO_SERVICE_Y6_VISIBLE_TOGGLE = 0xc5,

YAHOO_SERVICE_Y6_STATUS_UPDATE = 0xc6,

YAHOO_SERVICE_AVATAR_UPDATE = 0xc7,

YAHOO_SERVICE_VERIFY_ID_EXISTS = 0xc8,

YAHOO_SERVICE_AUDIBLE = 0xd0,

YAHOO_SERVICE_STATUS_15 = 0xf0,

YAHOO_SERVICE_LIST_15 = 0Xf1,

YAHOO_SERVICE_WEBLOGIN = 0x0226,

YAHOO_SERVICE_SMS_MSG = 0x02ea

};

6、STATUS 类型：4个字节，以下是yahoo协议中定义的用户状态

enum yahoo_status {

YAHOO_STATUS_AVAILABLE = 0,

YAHOO_STATUS_BRB,

YAHOO_STATUS_BUSY,

YAHOO_STATUS_NOTATHOME,

YAHOO_STATUS_NOTATDESK,

YAHOO_STATUS_NOTINOFFICE,

YAHOO_STATUS_ONPHONE,

YAHOO_STATUS_ONVACATION,

YAHOO_STATUS_OUTTOLUNCH,

YAHOO_STATUS_STEPPEDOUT,

YAHOO_STATUS_INVISIBLE = 12,

YAHOO_STATUS_CUSTOM = 99,

YAHOO_STATUS_IDLE = 999,

YAHOO_STATUS_WEBLOGIN = 0x5a55aa55,

YAHOO_STATUS_OFFLINE = 0x5a55aa56, /* don't ask */

YAHOO_STATUS_TYPING = 0x16

};

7、SESSION ID：4个字节，一般给服务器发送时，填充全0。服务器返回的包会自己填充服务器的SESSION。

8、分隔符：0xc080,在yahoo的包中用到的固定分隔符，用在关键字key和value之间以及其他任何需要分隔的地方，包括包头与后面内容的分隔。