未定义参考“DTLS_client_method” [英] Undefined reference to 'DTLS_client_method'
问题描述
目前，我正在试图实现以加密的UDP数据报在Android DTLS。
对于这一点，我建了的OpenSSL Android项目可以在这里，从此我有两个共享库的libssl的.so和libcrypto.so我libsslx.so重命名并libcryptox.so以避免在Android系统中包含的库混乱。
I'm currently trying to implement DTLS on android in order to encrypt UDP datagrams. For this, I built the openssl-android project available here, from this I got two shared libraries libssl.so and libcrypto.so which I renamed libsslx.so and libcryptox.so to avoid confusion with the included library in the android system.
然后我把这些文件（并因此对于OpenSSL的头文件夹）到我的Android项目JNI的文件夹下的结构如下：
Then I put these files (and so for the openssl header folder) into my android project under the jni folder with the following structure:
jni->|->includes--->openssl--->header files
|
|->precompiled-|->libcryptox.so
| |
| |->libsslx.so
|
|->Android.mk
|
|->security.cpp
在Android.mk文件内容：
Content of the Android.mk file:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := sslx
LOCAL_SRC_FILES := precompiled/libsslx.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/includes
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := cryptox
LOCAL_SRC_FILES := precompiled/libcryptox.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/includes
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := security
LOCAL_SRC_FILES := security.cpp
LOCAL_SHARED_LIBRARIES := sslx cryptox
include $(BUILD_SHARED_LIBRARY)
在security.cpp文件内容
Content of the security.cpp file
1 #include <jni.h>
2 #include <string.h>
3 #include <sys/types.h>
4 #include <sys/socket.h>
5 #include <netinet/in.h>
6 #include <arpa/inet.h>
7 extern "C" {
8 #include "openssl/bio.h"
9 #include "openssl/ssl.h"
10 #include "openssl/err.h"
11 struct sockaddr_in dst;
12 static int const SOCKET_ERROR = 1000;
13 static int const SOCKET_CREATED = 1100;
14 static int const BIO_ERROR = 1200;
15 static int const BIO_CREATED = 1300;
16 static int const CTX_ERROR = 1400;
17 static int const CTX_CREATED = 1500;
18 static int const SSL_ERROR = 1600;
19 static int const SSL_CREATED = 1700;
20 void Java_ch_gt_gcservjni_TestOpenSSLJni_initOpenSSL(JNIEnv *pEnv, jobject jObj){
21 SSL_load_error_strings();
22 ERR_load_BIO_strings();
23 OpenSSL_add_all_algorithms();
24 }
25 jlong Java_ch_gt_gcservjni_TestOpenSSLJni_startConnection(JNIEnv *pEnv, jobject jObj, jstring jAddress, jint jPort){
26 char *address;
27 jclass clazz = pEnv->GetObjectClass(jObj);
28 jmethodID mid = pEnv->GetMethodID(clazz, "printMessage", "(I)V");
29 if(mid == 0) return -1;
30 address = 0;
31 if (jAddress) {
32 address = (char *)pEnv->GetStringUTFChars( jAddress, 0);
33 if (!jAddress) return 0;
34 }
//Socket creation/////////////////////////////////////////////////////////////////////////////
35 int sock = 0;
36 int port = (int)jPort;
37 struct sockaddr_in addr;
38 addr.sin_addr.s_addr = htonl(INADDR_ANY);
39 addr.sin_port = htons(port);
40 sock = socket(PF_INET, SOCK_DGRAM, 0);
41 if(sock < 0){
42 pEnv->CallVoidMethod(jObj, mid, SOCKET_ERROR);
43 }else{
44 pEnv->CallVoidMethod(jObj, mid, SOCKET_CREATED);
45 }
///////////////////////////////////////////////////////////////////////////////////////////////
//Basic IO functionalities initialisation//////////////////////////////////////////////////////
46 BIO* cnx = BIO_new_dgram(sock, BIO_NOCLOSE);
47 if(cnx == NULL){
48 pEnv->CallVoidMethod(jObj, mid, BIO_ERROR);
49 }else{
50 pEnv->CallVoidMethod(jObj, mid, BIO_CREATED);
51 }
///////////////////////////////////////////////////////////////////////////////////////////////
52 struct sockaddr_in dst;
53 struct sockaddr* d = (struct sockaddr*)&dst;
54 dst.sin_family = AF_INET;
55 dst.sin_port = htons(port);
56 dst.sin_addr.s_addr = inet_addr(address);
//Set the BIO connection
57 int err = BIO_dgram_set_peer(cnx, d);
//Initialisalisation of the Context///////////////////////////////////////////////////////////
58 SSL_CTX *ctx = SSL_CTX_new(DTLSv1_client_method());
59 if(ctx == NULL){
60 pEnv->CallVoidMethod(jObj, mid, CTX_ERROR);
61 }
62 else{
63 pEnv->CallVoidMethod(jObj, mid, CTX_CREATED);
64 }
65 SSL_CTX_set_read_ahead(ctx, 1);
66 SSL_CTX_set_cipher_list(ctx, "HIGH:MEDIUM:aNull");
67 SSL *ssl = SSL_new(ctx);
68 if(ssl == NULL){
69 pEnv->CallVoidMethod(jObj, mid, SSL_ERROR);
70 }
71 else{
72 pEnv->CallVoidMethod(jObj, mid, SSL_CREATED);
73 }
74 SSL_set_bio(ssl, cnx, cnx);
75 SSL_set_connect_state(ssl);
76 return 0;
77 }
78 }
和这里有一个问题，当我建立这个code，所有功能，除了最重要的这是DTLSv1_client_method（），当我在该行58初始化上下文对象确定。
And here's the problem, when I build this code, all the functions are OK except the most important one which is the DTLSv1_client_method() when I initialize the context object at the line 58.
生成的错误，这是之一：
The generated error is this one:
/Applications/eclipse_bundle_mac/android-ndk-r8d/toolchains/arm-linux-androideabi- 4.6/prebuilt/darwin-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/security/security.o: in function Java_ch_gt_gcservjni_TestOpenSSLJni_startConnection:jni/security.cpp:107: error: undefined reference to 'DTLSv1_client_method'
如此看来，功能是不是在我建造图书馆参考，我检查了我的头文件中，DTLS功能都在那里，我在的OpenSSL Android项目的android-config.mk文件检查，看看是否功能未从打造专业化的结果排除在外，我想看看没有成功的.so文件的内容，顺便说一句，我的工作在Mac OS X上。
So it seems that the function is not referenced in my builded library, I checked my header files, the DTLS functions are there, I checked at the android-config.mk file of the openssl-android project to see if the functions were not excluded from the buid result and I tried to see the content of the .so files without success, btw I'm working on Mac OS X.
有没有人有关于DTLS android上的经验？我将AP preciate对于这个问题有所帮助。
Has anyone got experience about DTLS on android? I'll appreciate some help for this problem.
编辑：我设法让我的.so文件与ARM-Linux的androideabi-objdump的工具，并没有任何DTLS功能跟踪的内容。它可能来自OpenSSL的构建过程中我这样做，而是因为DTLS不是在android-config.mk丢弃真奇怪。
I managed to get the content of my .so files with the arm-linux-androideabi-objdump tool and no trace of any DTLS function. It maybe comes from the openssl build process I did, but it's strange because DTLS wasn't discarded in android-config.mk.
推荐答案
好吧，它是由刚刚好转的另一个项目在位于/应用/ SSL localted的.mk文件和/加密文件夹建立OpenSSL和修改共享库的名称解决为了避免混淆像它在这告诉<一href=\"http://stackoverflow.com/questions/11003111/android-cant-load-local-libcrypto-unsatisfied-link-error\">topic.
Ok, it's solved by just picking another project for building openssl and change the shared library names in the .mk files localted in /apps /ssl and /crypto folders to avoid confusion like it is told in this topic.
您可以找到我下使用该项目的网址
You can find the project I used under this url
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