Difference between revisions of "LightMessaging"

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(Digestible, Production Example Code)
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There are some cool helper functions for if you want to send Images / PropertyLists / etc instead of just strings. Look at the header file or other examples to see how to use them.
 
There are some cool helper functions for if you want to send Images / PropertyLists / etc instead of just strings. Look at the header file or other examples to see how to use them.
  
== Working, Digestible Example Code ==
+
 
 +
== References ==
 +
 
 +
=== Working, Digestible Example Code ===
  
 
* [https://github.com/r-plus/libcanopenurl/blob/master/LCCanOpenURL.x libcanopenurl]
 
* [https://github.com/r-plus/libcanopenurl/blob/master/LCCanOpenURL.x libcanopenurl]
 
* [https://github.com/rweichler/lucy/blob/master/client/liblucy.c lucy client], [https://github.com/rweichler/lucy/blob/master/server/springboard.m lucy server]
 
* [https://github.com/rweichler/lucy/blob/master/client/liblucy.c lucy client], [https://github.com/rweichler/lucy/blob/master/server/springboard.m lucy server]
  
== References ==
+
=== From rpetrich himself ===
  
 
* [https://rpetri.ch/jbcon2016/JailbreakCon2016.pdf rpetrich's JailbreakCon 2016 keynote on IPC]
 
* [https://rpetri.ch/jbcon2016/JailbreakCon2016.pdf rpetrich's JailbreakCon 2016 keynote on IPC]
 
* [https://github.com/rpetrich/LightMessaging/blob/master/LightMessaging.h LightMessaging.h]
 
* [https://github.com/rpetrich/LightMessaging/blob/master/LightMessaging.h LightMessaging.h]

Revision as of 01:26, 3 August 2016

LightMessaging is a sexy header-only IPC framework by the grate god Ryan Petrich. According to its GitHub page, it is a "simple low-level replacement for CFMessagePort".

Why should I use this?

  • Ryan Petrich.
  • Everyone else is using it.

Server

It is recommended that this is only done in SpringBoard.

Starting the Server

LMStartService("net.iphonedevwiki.some.server", CFRunLoopGetCurrent(), (CFMachPortCallBack)some_callback);

The Callback

void some_callback(CFMachPortRef port,
                        LMMessage *request,
                        CFIndex size,
                        void *info)
{
    // get the reply port
    mach_port_t replyPort = request->head.msgh_remote_port;
    // sanity check
    if(size < sizeof(LMMessage)) {
        LMSendReply(replyPort, NULL, 0);
        LMResponseBufferFree((LMResponseBuffer *)request);
        return;
    }
    
    // get the data you recieved
    void *data = LMMessageGetData(request);

    // send some data back
    const char *msg = "lol";
    LMSendReply(replyPort, msg, strlen(msg) + 1);

    // free the response buffer??
    LMResponseBufferFree((LMResponseBuffer *)request);
}

Client

This can be put literally anywhere.

// setup connection
LMConnection connection = {
    MACH_PORT_NULL,
    "net.iphonedevwiki.some.server"
};

//send message
LMResponseBuffer buffer;
const char *msg = "lol wtf";
SInt32 messageId = 0x1111; // this is arbitrary i think
LMConnectionSendTwoWay(connection, messageId, msg, strlen(msg) + 1, &buffer);
LMMessage *response = &(buffer.message);

// do whatever you want !!!!
const char *data = LMMessageGetData(response);

ConsumeInteger / ConsumePropertyList / etc

There are some cool helper functions for if you want to send Images / PropertyLists / etc instead of just strings. Look at the header file or other examples to see how to use them.


References

Working, Digestible Example Code

From rpetrich himself