initial code for dumping imessages in a reasonable format

dump-imessages/iphone-dataprotection/ramdisk_tools/IOKit.c

@@ -0,0 +1,90 @@
+#include <stdio.h>
+#include <string.h>
+#include "IOKit.h"
+
+struct ioconnectCache {
+    const char* serviceName;
+    io_connect_t conn;
+};
+
+struct ioconnectCache cache[10]={{NULL, 0}};
+
+void __attribute__((destructor)) IOKit_destruct()
+{
+    int i;
+    for (i=0; i < 10 && cache[i].conn != 0; i++) {
+        //printf("Closing %s\n", cache[i].serviceName);
+        IOServiceClose(cache[i].conn);
+    } 
+}
+
+io_connect_t IOKit_getConnect(const char* serviceName)
+{
+    IOReturn ret;
+    io_connect_t conn = 0;
+    int i;
+    
+    for (i=0; i < 10 && cache[i].serviceName != NULL; i++) {
+        if (!strcmp(serviceName, cache[i].serviceName))
+        {
+            //printf("got cache for %s\n", serviceName);
+            return cache[i].conn;
+        }
+    }
+    
+    CFMutableDictionaryRef dict = IOServiceMatching(serviceName);
+    io_service_t dev = IOServiceGetMatchingService(kIOMasterPortDefault, dict);
+    
+    if(!dev) {
+        fprintf(stderr, "FAIL: Could not get %s service\n", serviceName);
+        return -1;
+    }
+    
+    ret = IOServiceOpen(dev, mach_task_self(), 0, &conn);
+    
+    IOObjectRelease(dev);
+    if(ret != kIOReturnSuccess) {
+        fprintf(stderr, "FAIL: Cannot open service %s\n", serviceName);
+        return -1;
+    }
+    
+    if (i < 10) {
+        cache[i].serviceName = serviceName;
+        cache[i].conn = conn;
+    }
+    
+    return conn;
+}
+
+IOReturn IOKit_call(const char* serviceName,
+                    uint32_t     selector,
+                    const uint64_t  *input,
+                    uint32_t     inputCnt,
+                    const void      *inputStruct,
+                    size_t       inputStructCnt,
+                    uint64_t    *output,
+                    uint32_t    *outputCnt,
+                    void        *outputStruct,
+                    size_t      *outputStructCnt)
+{
+    IOReturn ret;
+    io_connect_t conn = IOKit_getConnect(serviceName);
+    
+    ret = IOConnectCallMethod(conn,
+                              selector,
+                              input,
+                              inputCnt,
+                              inputStruct,
+                              inputStructCnt,
+                              output,
+                              outputCnt,
+                              outputStruct,
+                              outputStructCnt);
+    
+    if (ret != kIOReturnSuccess)
+    {
+        fprintf(stderr, "IOConnectCallMethod on %s selector %d returned %x\n", serviceName, selector, ret);
+    }
+    
+    return ret;
+}