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[Cranky]

Smali Editing für Anfänger:

Da leider NIEMAND sagen kann er beherrscht smali komplett, werde ich euch hier einen Quelltext einfügen der in smali geschrieben ist. Dieser ist sehr limitiert, jedoch steht nach jedem # eine Beschreibung des Befehles.

.class public Lcom/lohan/crackme1/example;
.super Ljava/lang/Object;
.source "example.java"
 
 
# static fields
.field private static Counter:I
 
 
# direct methods
# all the constructor does is set Counter to 0x10 (or 16)
.method public constructor <init>()V
    .registers 2
 
    .prologue
    .line 11
    invoke-direct {p0}, Ljava/lang/Object;-><init>()V
 
    const/16 v0, 0x10
    sput v0, Lcom/lohan/crackme1/example;->Counter:I
 
    return-void
.end method
 
.method public static ArrayExample()V
    .registers 4
 
    .prologue
    const/4 v3, 0x1
    const/4 v2, 0x0
 
    .line 50
    const/4 v1, 0x5
 
    new-array v0, v1, [Ljava/lang/String;
 
    .line 52
    .local v0, someArray:[Ljava/lang/String;
 
    # put value v1 inside array v0 at index v2 (0x0)
    const-string v1, "set value at index 0"
    aput-object v1, v0, v2
 
    .line 53
    # put value v1 inside array v0 at index v3 (0x1)
    const-string v1, "index 1 has this value"
    aput-object v1, v0, v3
 
    .line 55
    # store in v1 the value from array v0 at index v2
    aget-object v1, v0, v2
 
    # store in v2 the value from array v0 at index v3
    aget-object v2, v0, v3
 
    # compare two strings
    invoke-virtual {v1, v2}, Ljava/lang/String;->equals(Ljava/lang/Object;)Z
    move-result v1
 
    # if equals() returns 0, it means they are not equal, so just return
    if-eqz v1, :cond_1e
 
    .line 57
    sget-object v1, Ljava/lang/System;->out:Ljava/io/PrintStream;
    const-string v2, "array at index 0 = 1 (wont happen)"
    invoke-virtual {v1, v2}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
 
    .line 59
    :cond_1e
    return-void
.end method
 
# loop from 0 to Counter
# just a few lines in java
.method public static LoopExample()V
    .registers 4
 
    .prologue
    .line 15
    const/4 v0, 0x0
 
    .local v0, i:I
    :goto_1
    sget v1, Lcom/lohan/crackme1/example;->Counter:I
 
    if-lt v0, v1, :cond_6
 
    .line 17
    return-void
 
    .line 16
    :cond_6
    sget-object v1, Ljava/lang/System;->out:Ljava/io/PrintStream;
 
    new-instance v2, Ljava/lang/StringBuilder;
    const-string v3, "current val for loop: "
    invoke-direct {v2, v3}, Ljava/lang/StringBuilder;-><init>(Ljava/lang/String;)V
    invoke-virtual {v2, v0}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;
    move-result-object v2
 
    invoke-virtual {v2}, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;
    move-result-object v2
 
    invoke-virtual {v1, v2}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
 
    .line 15
    add-int/lit8 v0, v0, 0x1
 
    goto :goto_1
.end method
 
.method public static SwitchExample()V
    .registers 3
 
    .prologue
    .line 21
    const/16 v0, 0x2a
 
    .line 22
    .local v0, val:I
     
    # begin the switch
    # look down at .sparse_switch directive
    sparse-switch v0, :sswitch_data_2e
 
    # switch default just passes through to here
    .line 27
    sget-object v1, Ljava/lang/System;->out:Ljava/io/PrintStream;
    const-string v2, "invalid value"
    invoke-virtual {v1, v2}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
 
    .line 29
    :goto_c
    return-void
 
    .line 23
    :sswitch_d # if v0 is 1, we'll be here
    sget-object v1, Ljava/lang/System;->out:Ljava/io/PrintStream;
    const-string v2, "val 1"
    invoke-virtual {v1, v2}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
    goto :goto_c
 
    .line 24
    :sswitch_15 # if v0 is 2
    sget-object v1, Ljava/lang/System;->out:Ljava/io/PrintStream;
    const-string v2, "val 2"
    invoke-virtual {v1, v2}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
    goto :goto_c
 
    .line 25
    :sswitch_1d # if v0 is 42
    sget-object v1, Ljava/lang/System;->out:Ljava/io/PrintStream;
    const-string v2, "val 42"
    invoke-virtual {v1, v2}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
    goto :goto_c
 
    .line 26
    :sswitch_25 # if v0 is 5
    sget-object v1, Ljava/lang/System;->out:Ljava/io/PrintStream;
    const-string v2, "val 5"
    invoke-virtual {v1, v2}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
    goto :goto_c
 
    .line 22
    nop
 
    :sswitch_data_2e
    # if v0 is 0x1 goto :sswitch_d
    # if 0x2 :sswitch_15
    # and so on...
    .sparse-switch
	    0x1 -> :sswitch_d   # 1
	    0x2 -> :sswitch_15  # 2
	    0x5 -> :sswitch_25  # 5
	    0x2a -> :sswitch_1d # 42
    .end sparse-switch
.end method
 
.method public static TryCatchExample()V
    .registers 8
 
    .prologue
    const-string v7, ": "
 
    .line 33
    const-string v3, "google.com"
 
    .line 36
    .local v3, urlStr:Ljava/lang/String;
    # begin try here
    :try_start_4
    new-instance v2, Ljava/net/URL;
 
    invoke-direct {v2, v3}, Ljava/net/URL;-><init>(Ljava/lang/String;)V
 
    .line 37
    .local v2, url:Ljava/net/URL;
    invoke-virtual {v2}, Ljava/net/URL;->openStream()Ljava/io/InputStream;
 
    move-result-object v1
 
    .line 38
    .local v1, is:Ljava/io/InputStream;
    invoke-virtual {v1}, Ljava/io/InputStream;->close()V
    :try_end_10
    # end of the try
     
	 # if there was a MalformedURLException, goto :catch_11
    .catch Ljava/net/MalformedURLException; {:try_start_4 .. :try_end_10} :catch_11
     
    # IOException goes to :catch_36
    .catch Ljava/io/IOException; {:try_start_4 .. :try_end_10} :catch_36
 
    # if NO exception, just pass through:
    .line 46
    .end local v1		   #is:Ljava/io/InputStream;
    .end local v2		   #url:Ljava/net/URL;
    :goto_10
    return-void
 
    .line 39
    :catch_11
    # move the exception to v4, then to v0
    # all of the code below is what happens with an exception
    move-exception v4
    move-object v0, v4
 
    .line 41
    .local v0, e:Ljava/net/MalformedURLException;
    sget-object v4, Ljava/lang/System;->out:Ljava/io/PrintStream;
 
    new-instance v5, Ljava/lang/StringBuilder;
    const-string v6, "Invalid URL "
    invoke-direct {v5, v6}, Ljava/lang/StringBuilder;-><init>(Ljava/lang/String;)V
    invoke-virtual {v5, v3}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;
    move-result-object v5
 
    const-string v6, ": "
    invoke-virtual {v5, v7}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;
    move-result-object v5
 
    invoke-virtual {v0}, Ljava/net/MalformedURLException;->getMessage()Ljava/lang/String;
    move-result-object v6
 
    invoke-virtual {v5, v6}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;
    move-result-object v5
 
    invoke-virtual {v5}, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;
    move-result-object v5
 
    invoke-virtual {v4, v5}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
 
    goto :goto_10
 
    .line 42
    .end local v0		   #e:Ljava/net/MalformedURLException;
    # end exception code
     
    # begin exception code    
    :catch_36
    move-exception v4
    move-object v0, v4
 
    .line 44
    .local v0, e:Ljava/io/IOException;
    sget-object v4, Ljava/lang/System;->out:Ljava/io/PrintStream;
 
    new-instance v5, Ljava/lang/StringBuilder;
    const-string v6, "Unable to execute "
    invoke-direct {v5, v6}, Ljava/lang/StringBuilder;-><init>(Ljava/lang/String;)V
    invoke-virtual {v5, v3}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;
    move-result-object v5
 
    const-string v6, ": "
    invoke-virtual {v5, v7}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;
    move-result-object v5
 
    invoke-virtual {v0}, Ljava/io/IOException;->getMessage()Ljava/lang/String;
    move-result-object v6
 
    invoke-virtual {v5, v6}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;
    move-result-object v5
 
    invoke-virtual {v5}, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;
    move-result-object v5
 
    invoke-virtual {v4, v5}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
 
    goto :goto_10
    # end exception code
.end method

Das ist Leider wirklich nur eine BASIS.

Wie lernt man smali?

Schreibe ein APP. Beispiel Hello world. Nun decompile das App und vergleiche Strings.

Hier mal ein Komplett in smali geschriebenes Hello World. In den Kommentaren (#) seht ihr auch wie ihr smali files builden könnt:

.class public LHelloWorld;
 
# Ye olde hello world application
# To assemble and run this on a phone or emulator:
#
# java -jar smali.jar -o classes.dex HelloWorld.smali
# zip HelloWorld.zip classes.dex
# adb push HelloWorld.zip /data/local
# adb shell dalvikvm -cp /data/local/HelloWorld.zip HelloWorld
#
# if you get out of memory type errors when running smali.jar
# give java more memory with -Xmx512m, like this:
# java -Xmx512m -jar smali.jar HelloWorld.smali
 
.super Ljava/lang/Object;
 
.method public static main([Ljava/lang/String;)V
    .registers 2
 
    sget-object v0, Ljava/lang/System;->out:Ljava/io/PrintStream;
 
    const-string v1, "hello,world!"
 
    # combine executing with adb shell commands and console output
    # and you have a very quick way to test code
    invoke-virtual {v0, v1}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
 
    return-void
.end method