Get the list of functions in a DLL

Question

HI,
Is there anyway to get the list of all the functions defined in a particular DLL e.g. I have the following native function
static
System.loadLibrary( "A" );
I load the above dll is there a way to get the name of all the functions defined in that DLL.
thanks

Answer 1

If you have the Microsoft Visual Studio installed you can use the "depends" tool or the "dumpbin /exports" command. I will give you an example for the w2k_lsa_auth.dll DLL that is a part of the J2SDK 1.4.2 and implements the method acquireDefaultNativeCreds in the class sun.security.krb5.Credentials. You can see that you can't determine what parameters you need to pass to the acquireDefaultNativeCreds method using the tool because such information is not present in the DLL, only in the associated Java class. (Sorry, I don't know if there is a GNU tool that does the same thing).
Hint - DLLs that have JNI code usually have a lot of functions whose names start with "_Java_".
C:\j2sdk1.4.2_04\jre\bin>dumpbin /exports w2k_lsa_auth.dll
Microsoft (R) COFF/PE Dumper Version 7.10.3077
Copyright (C) Microsoft Corporation.  All rights reserved.
Dump of file w2k_lsa_auth.dll
File Type: DLL
  Section contains the following exports for w2k_lsa_auth.dll
    00000000 characteristics
    3A5DE0FE time date stamp Thu Jan 11 14:36:14 2001
        0.00 version
           1 ordinal base
           3 number of functions
           3 number of names
    ordinal hint RVA      name
          1    0 00001000 _JNI_OnLoad@8
          2    1 000012C4 _JNI_OnUnload@8
          3    2 0000137F _Java_sun_security_krb5_Credentials_acquireDefaultNati
veCreds@8
  Summary
        1000 .data
        1000 .rdata
        1000 .reloc
        1000 .text