100 lines
3.8 KiB
Markdown
100 lines
3.8 KiB
Markdown
# Introduction
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`CVR` is a command introduced with [MSNP2](../versions/msnp2.md).
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It is a Notification Server and as of [MSNP8](../versions/msnp8.md) a Dispatch Server command, without either a request or response payload.
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Sends the current client information and retrieves the latest avaliable version of the client.
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Related to [CVQ](cvq.md).
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# Client/Request
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`CVR TrID locale system-type system-ver system-arch requesting-library client-version {client-identification} {user-handle}`
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Where `locale` is a 16-bit hexadecimally encoded LCID. `0x0409` is the LCID for English, United States.
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Where `system-type` is a string that defines the operating system you are using, such as `winnt`.
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Where `system-ver` is the major and minor version of the operating system, such as `5.1`.
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Where `system-arch` is the architecture of the processor that is used to run the client, usually `i386`.
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Where `requesting-library` is the name of the library that requested this CVR, usually `MSMSGS` or `MSNMSGR`.
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Where `client-version` is the current client's major, minor and patch version, should be in the format of "{M}M.m.pppp".
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Where `client-identification` is the internal name of the codebase used to create `requesting-library`, usually `MSMSGS` or an empty parameter.
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Included since [MSNP4](../versions/msnp4.md). Non-empty since [MSNP8](../versions/msnp8.md).
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Where `user-handle` is the user's handle. Included since [MSNP8](../versions/msnp8.md).
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# Server/Response
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`CVR TrID recommended-version recommended-version-2 minimum-allowed-version download-url fallback-url`
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Where `recommended-version` is the current version of the client for this system.
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Where `recommended-version-2` is (usually) the same as `recommended-version`,
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Could possibly be a maximum allowed version? (forced downgrade)
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Where `minimum-allowed-version` is the lowest version the server considers "safe" to connect with.
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If the client's `client-version` is lower than the server's `minimum-allowed-version`,
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the client should automatically disconnect from the server,
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and request an forced upgrade using the binary provided in `download-url`.
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Where `download-url` is the file to download and open to update this client to `recommended-version`.
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Where `fallback-url` is the URL the client opens if it failed to download `download-url` for any reason.
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# Examples
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*NOTE: This has been line-breaked.
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Lines beginning with `..` are continuations of the previous line."
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## Post-login
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*Only used in [MSNP2](../versions/msnp2.md) to [MSNP7](../versions/msnp2.md).*
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```
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C: CVR 1 0x0409 win 4.10 i386 MSMSGS 1.0.0863 MSMSGS
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S: CVR 1 5.0.0537 5.0.0537 1.0.0863
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.. http://download.microsoft.com/download/msnmessenger/install/5.0/w98nt42kmexp/en-us/setupdl.exe
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.. http://messenger.microsoft.com
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```
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Client asks if user would like to update, and stays connected.
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## Pre-login
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*Since [MSNP8](../versions/msnp8.md).*
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```
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C: CVR 2 0x0409 winnt 5.1 i386 MSNMSGR 6.0.0602 MSMSGS example@hotmail.com
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S: CVR 2 7.0.0813 7.0.0813 6.2.0205
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.. http://msgr.dlservice.microsoft.com/download/5/d/9/5d9bb5b2-49c7-4890-94ab-d1d5e44a0e6d/Install_MSN_Messenger.exe
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.. http://messenger.msn.com
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```
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Client disconnects from server, since it sees that `minimum-allowed` is above it's `client-version`.
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## Invalid client identification or version
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*This response may or may not disconnect you.*
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```
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C: CVR 3 0x0409 winnt 5.0 i386 MSNMSGR 99.9.9999 MSMSGS
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S: 420 3
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C: CVR 4 0x0409 winnt 5.0 i386 YCOMM 0.1.0023 MSMSGS
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S: 420 4
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```
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## Invalid language ID
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```
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C: CVR 5 0x1111 winnt 5.1 MSNMSGR 6.0.0602 MSMSGS example@hotmail.com
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S: 710 5
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```
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## Invalid CVR
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```
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C: CVR 6 spaghetti
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S: 731 6
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```
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Server disconnects client.
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# Known changes
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* [MSNP2](../versions/msnp2.md): Added a fallback URL parameter to the response (parameter 5).
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* [MSNP4](../versions/msnp4.md):
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* [MSNP8](../versions/msnp8.md): Added support for this command in Dispatch Servers.
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* Removed in MSNP24.
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