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first draft of rough JNI interface

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Greg Alexander 2014-12-16 10:34:10 -05:00
parent 720007ae32
commit e1d43c3208
1 changed files with 62 additions and 1 deletions
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63
jni/interface.c
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@ -1,4 +1,65 @@
#include <jni.h>
#include <sys/types.h>
#include <signal.h>
#include <unistd.h>
/* XXX - java-invocable function that starts listener */
/* XXX - do i need a function to generate host keys? DROPBEAR_DELAY_HOSTKEY */
/* XXX - a C-callable interface to get property strings from the java side (paths, etc) */
static JNIEnv *env;
static jclass cl_string;
static jclass cl_simplesshdservice;
static jfieldID fid_sss_sshd_pid;
static int
jni_init(JNIEnv *env_)
{
env = env_;
#define CLASS(var, id) \
cl_##var = (*env)->FindClass(env, id); \
if (!cl_##var) return 0;
#define METHOD(var, mycl, id, sig) \
mid_##var = (*env)->GetMethodID(env, cl_##mycl, id, sig); \
if (!mid_##var) return 0;
#define FIELD(var, mycl, id, sig) \
fid_##var = (*env)->GetFieldID(env, cl_##mycl, id, sig); \
if (!fid_##var) return 0;
#define STFIELD(var, mycl, id, sig) \
fid_##var = (*env)->GetStaticFieldID(env, cl_##mycl, id, sig); \
if (!fid_##var) return 0;
CLASS(string, "java/lang/String")
CLASS(simplesshdservice, "org/galexander/sshd/SimpleSSHDService")
FIELD(sss_sshd_pid, simplesshdservice, "sshd_pid", "I")
return 1;
}
JNIEXPORT void JNICALL
Java_org_galexander_sshd_SimpleSSHDService_start_1sshd(JNIEnv *env_,
jobject this)
{
pid_t pid;
if (!jni_init(env_)) {
return;
}
pid = fork();
if (pid == 0) {
/* XXX - call dropbear main() */
} else {
(*env)->SetIntField(env, this, fid_sss_sshd_pid, pid);
}
}
JNIEXPORT void JNICALL
Java_org_galexander_sshd_SimpleSSHDService_stop_1sshd(JNIEnv *env_, jobject this)
{
pid_t pid;
if (!jni_init(env_)) {
return;
}
pid = (*env)->GetIntField(env, this, fid_sss_sshd_pid);
kill(pid, SIGKILL);
(*env)->SetIntField(env, this, fid_sss_sshd_pid, 0);
}