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IPMsg飞鸽传书--文件传输解析这里继续讨论IPMSG飞鸽传书，前几天，详细的了解了IPMSG飞鸽传书的网络协议，详细分析并且实现了IPMSG飞鸽传书的消息传递过程，这里就IPMSG飞鸽传书中的文件和文件夹的传输做详细的说明。在IPMSG 飞鸽传书中，如果要进行文件或者文件夹的传输，首先需要做的就是消息的应答，通过UDP发送文件传输报文，另外的IPMSG飞鸽传书客户端收到报文后，使用TCP协议发送应答报文，这阅读详情

最近看到一些朋友在编写网络程序是遇到一些问题，故把以前做IPMSG时翻译的文档贴过来，希望对网络编程新手有所帮助，在寻找编程项目的同学们也可参照此文档写出自己的IPMSG。

本文只包含其中几个比较重要的命令以及运行机制的中文翻译，更详细的内容请参照文后的IPMSG 协议英文文档

声明：下述协议内容略去了一些在编写程序过程中没有用到协议内容，最初的Ipmsg协议是用日文写的，下面协议内容由本人(cugb_cat)翻译自Mr.Kanazawa的英文文档。本翻译文档可任意传播和使用。

IP信使传输协议(第9版草案) 1996/02/21
2003/01/14 修订

H.Shirouzu
shirouzu@h.email.ne.jp

关于IP信使：
IP信使使用TCP/UDP协议提供收发消息及文件(目录)。
特性：
IP信使能够安装在任何一个安装了TCP/IP协议栈的操作系统上，使用在线用户的动态识别机制，可以和在线所有用户进行信息交换。
运行机制介绍：
使用TCP/UDP端口(默认端口为2425)，消息的收发使用UDP协议，文件(文件夹)的收发使用TCP协议。
1、   命令字：
1)   基本命令字(32位命令字的低8位)
    IPMSG_NOOPERATION     不进行任何操作
    IPMSG_BR_ENTRY     用户上线
    IPMSG_BR_EXIT         用户退出
    IPMSG_ANSENTRY     通报在线
    IPMSG_SENDMSG         发送消息
    IPMSG_RECVMSG         通报收到消息
    IPMSG_GETFILEDATA     请求通过TCP传输文件
    IPMSG_RELEASEFILES   停止接收文件
    IPMSG_GETDIRFILES     请求传输文件夹
2)   选项位(32位命令字的高24位)
IPMSG_SENDCHECKOPT   传送检查(需要对方返回确认信息)
IPMSG_FILEATTACHOPT   传送文件选项
3)   附件类型命令(文件类型命令字的低8位)
IPMSG_FILE_REGULAR   普通文件
IPMSG_FILE_DIR     目录文件
IPMSG_FILE_RETPARENT   返回上一级目录
2、   数据包格式(使用字符串)：
1)   数据包格式(版本1的格式)
版本号(1):包编号:发送者姓名:发送者主机名:命令字:附加信息
2)   举例如下
“1:100:shirouzu:Jupiter:32:Hello”
3、   数据包处理总述：
1)   用户识别
当IPMSG 启动时，命令IPMSG_BR_ENTRY被广播到网络中，向所有在线的用户提示一个新用户的到达(即表示“我来了”)；所有在线用户将把该新上线用户添加到自己的用户列表中，并向该新上线用户发送IPMSG_ANSENTRY命令(即表示“我在线”)；该新上线用户接收到IPMSG_ANSENTRY命令后即将在线用户添加到自己的用户列表中。
2)   收发消息
使用IPMSG_SENDMSG命令发送消息，消息内容添加在附加信息中；在接收消息时，如果对方要求回信确认(IPMSG_SENDCHECKOPT位打开)，则需发送IPMSG_RECVMSG命令并将对方发送的数据包的编号放在附加信息中一同发送至发送消息方
3)   附加文件的扩充(添加于第9版)
带有IPMSG_FILEATTACHOPT位的IPMSG_SENDMSG命令可用来传输文件，文件属性及内容添加在附加信息中，文件内容添加在消息内容后并以’/0’与之分隔开。传输文件时以下信息将被添加到消息内容之后(包括格式)：文件序号:文件名:大小(单位:字节):最后修改时间:文件属性[: 附加属性=val1[,val2…][:附加信息=…]]:/a:文件序号…
(文件大小、最后修改时间和文件属性为十六进制数，如果文件名中包含’:’则使用“::”代替)。
接收端开始接收文件时，请求传输文件命令IPMSG_GETFILEDATA将发送到发送端的TCP端口(和UDP的发送端口相同)，并将发送端发送的包编号:文件序号:偏移量(全为十六进制格式)写到附加信息区一同发送，文件发送端接收到该请求信息并进行校验正确后即开始发送文件(不使用任何格式，亦不进行加密)。
当接收端接收到目录文件时，将发送附加信息区为发送端发送的包编号:文件序号:偏移量(全为十六进制格式)的 IPMSG_GETDIRFILES命令，以用来请求传输目录文件；发送端则将头信息长度:文件名:文件大小:文件属性:文件内容添加到附加信息区(除了文件名和文件内容外，其余皆为十六进制)，头信息长度是从头信息长度开始到文件内容前的‘:’分割符为止的字符个数。
当文件属性为IPMSG_FILE_DIR时，IPMsg能够自动识别其为目录，下一个文件的数据在该目录之后。
当文件属性为IPMSG_FILE_RETPARENT时，IPMsg识别其动作为返回上一级目录，在这种情况下，文件名为‘.’其属性为当前目录的值。

附IPMSG协议英文版:

QUOTE:
Original ipmsg protocol specification is written in Japanese.
This document was translated by Mr.Kanazawa.
This document is not verified yet.

----------------------------------------------------------------------
IP Messenger communication protocol (Draft-9) 1996/02/21
Modified 2003/01/14

H.Shirouzu
shirouzu@h.email.ne.jp
----------------------------------------------------------------------

About IP Messenger
This is a Send/Receive message service using the TCP/UDP Port.

Characteristics
    IP Messenger can be installed in any OS if TCP/IP is used on your machine.
    Dynamic member recognition can be done within your network or specified network.
    You can exchange messages between all IPMsg members.

Function description
Use TCP/UDP port(default:2425). See the following descriptions
(Message Send/Receive: UDP, File Send/Receive: TCP)

1. Command

1) Command functions (Low 8 bits from command number 32 bits)

    IPMSG_NOOPERATION     No Operation
    IPMSG_BR_ENTRY           Entry to service (Start-up with a Broadcast command)
    IPMSG_BR_EXIT           Exit from service (End with a Broadcast command)
    IPMSG_ANSENTRY           Notify a new entry
    IPMSG_BR_ABSENCE     Change absence mode

    IPMSG_BR_ISGETLIST     Search valid sending host members
    IPMSG_OKGETLIST           Host list sending notice
    IPMSG_GETLIST           Host list sending request
    IPMSG_ANSLIST           Host list sending

IPMSG_SENDMSG Message transmission
IPMSG_RECVMSG Message receiving check

    IPMSG_READMSG           Message open notice
    IPMSG_DELMSG           Message discarded notice
    IPMSG_ANSREADMSG     Message open confirmation notice(added from version-8 )

    IPMSG_GETFILEDATA     File Transfer request by TCP
    IPMSG_RELEASEFILES     Discard attachment file
    IPMSG_GETDIRFILES     Attachment hierarchical file request

IPMSG_GETINFO Get IPMSG version info.
IPMSG_SENDINFO Send IPMSG version info.

IPMSG_GETABSENCEINFO Get absence sentence
IPMSG_SENDABSENCEINFO Send absence sentence

IPMSG_GETPUBKEY RSA Public Key Acquisition
IPMSG_ANSPUBKEY RSA Public Key Response

2) Option flag (High 24 bits from command number 32 bits)

    IPMSG_ABSENCEOPT     Absence mode(Member recognition command)
    IPMSG_SERVEROPT           Server(Reserved)
    IPMSG_DIALUPOPT           Send individual member recognition command

    IPMSG_SENDCHECKOPT     Transmission check
    IPMSG_SECRETOPT           Sealed message
    IPMSG_READCHECKOPT     Sealed message check(added from ver8 )
    IPMSG_PASSWORDOPT     Lock
    IPMSG_BROADCASTOPT     Broadcast message
    IPMSG_MULTICASTOPT     Multi-cast(Multiple casts selection)
    IPMSG_NEWMUTIOPT     New version multi-cast(reserved)
    IPMSG_AUTORETOPT     Automatic response(Ping-pong protection)
    IPMSG_NOLOGOPT           No log files
    IPMSG_NOADDLISTOPT     Notice to the members outside of BR_ENTRY

IPMSG_FILEATTACHOPT File attachment
IPMSG_ENCRYPTOPT Code

IPMSG_NOPOPUPOPT (No longer valid)
IPMSG_RETRYOPT Re-send flag(Use when acquiring HOSTLIST)

3) Extended code flag (hex format combination)

    IPMSG_RSA_512
    IPMSG_RSA_1024
    IPMSG_RSA_2048
    IPMSG_RC2_40
    IPMSG_RC2_128
    IPMSG_RC2_256
    IPMSG_BLOWFISH_128
    IPMSG_BLOWFISH_256
    IPMSG_SIGN_MD5

4) Extended files for attachment (fileattr low 8 bits)

    IPMSG_FILE_REGULAR
    IPMSG_FILE_DIR
    IPMSG_FILE_RETPARENT
    IPMSG_FILE_SYMLINK
    IPMSG_FILE_CDEV
    IPMSG_FILE_BDEV
    IPMSG_FILE_FIFO
    IPMSG_FILE_RESFORK

5) Attachment file extended attribute(fileattr high 24 bits)

    IPMSG_FILE_RONLYOPT
    IPMSG_FILE_HIDDENOPT
    IPMSG_FILE_EXHIDDENOPT
    IPMSG_FILE_ARCHIVEOPT
    IPMSG_FILE_SYSTEMOPT

6) Extended file attribute for attachment file

    IPMSG_FILE_UID
    IPMSG_FILE_USERNAME
    IPMSG_FILE_GID
    IPMSG_FILE_GROUPNAME
    IPMSG_FILE_PERM
    IPMSG_FILE_MAJORNO
    IPMSG_FILE_MINORNO
    IPMSG_FILE_CTIME
    IPMSG_FILE_MTIME
    IPMSG_FILE_ATIME
    IPMSG_FILE_CREATETIME

    IPMSG_FILE_CREATOR
    IPMSG_FILE_FILETYPE
    IPMSG_FILE_FINDERINFO

    IPMSG_FILE_ACL
    IPMSG_FILE_ALIASFNAME
    IPMSG_FILE_UNICODEFNAME

2.Command format(Use all character strings)

1) Command(Format version-1)

Ver(1) : PacketNo : SenderName : SenderHost : CommandNo : AdditionalSection

2) An example for Message Send/Receive by using the current command format

"1:100:shirouzu:jupiter:32:Hello"

3.Command process overview

1) Member recognition

An IPMSG_BR_ENTRY command notifies a new entry to the current
members at start-up.

All members add the new member to their list after getting a notification message.
An IPMSG_ANSENTRY command sends a message back to the new member.

    The new member gets the current member data by a
    IPMSG_ANSENTRY command. All members can communicate as long as an
    IP packet exists.

    An IPMSG_BR_ABSENCE command broadcasts absence mode cancel or
    nickname change to all members. However, an IPMSG_ANSENTRY command
    does not send a message back, which is different from an IPMSG_BR_ENTRY
    command.

    IPMSG_BR_ENTRY, IPMSG_ANSENTRY, and IPMSG_BR_ABSENCE commands
    use an IPMSG_ABSENCEOPT flag for absence mode. Input a nickname to
    additional command.
    Add an IPMSG_DIALUPOPT flag for dial-up users who can't be reached by
    a broadcast command. A member recognition command needs to be
    sent individually to the members with this optional flag.

    (Extended group)IPMSG_BR_ENTRY and IPMSG_BR_ABSENCE commands
    sends a group name by adding the new group name after the current
    command format character strings (Input '/0' between the current
    command and extended name).

2) Send/Receive Message
    Send Message uses an IPMSG_SENDMSG command that can input a message
    in the extended area.
    Receive Message sends back an IPMSG_RECVMSG command only
    if an IPMSG_SENDCHECKOPT flag is ON. Input the original packet number
    to the extended area.

    Broadcast Message Send uses an IPMSG_BOADCASTOPT command
    and an IPMSG_SENDMSG flag should be ON.
    Auto-Send packet(absence notice) needs to be added to IPMSG_AUTORETOPT
    for ping-pong protection. If either one or another packet is ON, then
    confirmation/auto-send packet is not sent back.

    Send Message Sealing needs to be an IPMSG_SECRETOPT packet ON.
    In this case, Receive Message sends an IPMSG_READMSG command.
    Input the original packet number to the extended area.

    (Additional IPMSG_NOADDLISTOPT)
    When receiving an IPMSG_SENDMSG packet from a host that is
    not on your Send/Receive list, IPMsg will either confirm a host by
    sending an IPMSG_BR_ENTRY command or add a host name to
    the Send/Receive list.
    However, single-shot Message Send/Receive action needs to be avoided.
    Add an IPMSG_NOADDLISTOPT flag to an IPMSG_SENDMSG command.

    (Additional IPMSG_READCHECKOPT from version-8 )
    When an IPMSG_READMSG command contains an IPMSG_READCHECKOPT flag,
    IPMsg process is the same as IPMSG_SENDMSG with an
    IPMSG_SENDCHECKOPT flag.
    However, Send Message uses an IPMSG_ANSREADMSG command,
    not IPMSG_RECVMSG.

3) Message Send/Receive 亅encrypted extension (Added in the version-9 )

Use the combination of Public-key(RSA) and common key(RC2/Blowfish).
(Encrypted extension area is used in hex format.)

    (Public key acquisition)Send an IPMSG_GETPUBKEY command to Receive
    Message. Receive Message gets an IPMSG_ANSPUBKEY that
    means receiving RSA public key from Send Message.

    IPMSG_GETPUBKEY/IPMSG_ANSPUBKEY both require the value which is
    encryption capability (Exp. IPMSG_RSA_1024) flag uses "OR" at first
    part of extension

    In addition, In IPMSG_ANSPUBKEY, public key written as EE-NNNNNN
    E=Exponent丄N=method)devide by ':'. and Input the Fdelimiter '-'
    between E and N.

    This sequence can be skipped after the 2nd Send/Receive process by
    memorizing public key and encrypted data.

    (Encrypted message)After a sender creates a common key that is
    supported both sender and receiver, a common key can encrypt a message.
    In addition, a receiver's public key encrypts the common key.

    (Encrypted message transmission) IPMSG_ENCRYPTOPT is used in
    IPMSG_SENDMSG. At the first part of extension, input the value which
    is 'or' resoult from Convination of public key and common key type .
    Then use common key which encrypt with public key devide by ':'.
    Then input message which is eccrypted by public key devide by ':'.
    If both supports IPMSG_SIGN_XXX, then add ':' and signeture.

Also, In the method of encode padding, PKCS#1ECB key is used for RSA,
PKCS#5 CBC common key is used for RC2/blowfish.

Also, The Packet related to Entry manifestation the capability of
ecryption support using IPMSG_ENCRYPTOPT

4) Extension with file attachment(Available from version-9 )

    An IPMSG_SENDMSG command with an IPMSG_FILEATTACHOPT flag for
    File transfer (download permission)notification sends a message
    with attachment.
    Input '/0' after the message and attachment file data.

    fileID:filename:size:mtime:fileattr[:extend-attr=val1
    [,val2...][:extend-attr2=...]]:/a:fileID...
    (size, mtime, and fileattr describe hex format.
      If a filename contains ':', please replace with "::".)

    When Receive Message downloads an attachment file, an IPMSG_GETFILEDATA
    command requests a data transmission packet to the TCP port that is the same number
    as the UDP sending port number. Input packetID:fileID: offset to the extended area.
    (Use all hex format.)
    File Transfer side receives the request. After recognizing that it's a correct request,
    then send the specified data (no format)

    When the data receiving side downloads a hierarchical attachment file,
    use an IPMSG_GETDIRFILES command and input a packetID:fileID
    to the extended area and send a data transmission request packet.
    (all hex format)

    Data sending side sends the following hierarchical data format.
    header-size:filename:file-size:fileattr[:extend-attr=val1
    [,val2...][:extend-attr2=...]]:contents-data
    Next headersize: Next filename...
    (All hex format except for filename and contetns-data)

    header-size is from the beginning of header-size to the delimiter ':'
    that is before contents-data. extend-attr can be omitted and used multiple
    extended attributes. Use '=' for data input.

When fileattr is IPMSG_FILE_DIR, IPMsg recognizes that it is automatically
in the directory, the next file data is after the directory.

    When fileattr is IPMSG_FILE_RETPARENT, IMPsg recognizes that it returns
    to the parent directory. In this case, File name is always "." and the attribute
    value is the current directory data.

Sending process starts from the attachment directly and returns the
IPMSG_FILE_RETPARENT command to the attachment directory.

Add an IPMSG_FILEATTACHOPT flag for an Entry packet to support the
attachment file.

5) Other commands

    When acquiring different versions, send an IPMSG_GETINFO command.
    Receiving side sends the version information character string to
    extended area.

    Send an IPMSG_GETABSENCEINFO command for acquiring an absence message.
    Receiving side sends an IPMSG_SENDABSENCEINFO back if the status is absence mode.
    If the status is not absence mode, a character string "Not absence mode" will be sent back.

6) Confirmation/Retry

    If a confirmation packet for IPMSG_SENDMSG or IPMSG_RECVMSG is not delivered
    within a specified time, then it will be sent again.
    A number of retry actions or interval period is depended on the current condition.

4. Other

1) Linefeed

Linefeed characters in Send Message is standardized with UNIX type ('0x0a').
Please change if needed.

2) Delimiter ':'

    ':' is used as a delimiter. You can't use this delimiter for user name
    and host name.
    If the use/host names contain a ':', please replace with another sign,
    for an example ';'.
    Although using this delimiter isn't problem as yet, I may create an
    escape sequence.

3) Kanji codes

SJIS

5. Contact e-mail address

E-Mail shirouzu@h.email.ne.jp

Note
See ipmsg.h for command codes.
Please e-mail me your comments and suggestions.

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