Checkout from seSuperuser/Superuser, leaving only native parts

- Checkout from https://github.com/seSuperuser/Superuser (commit: 69f84dd7a035b4a9f18dea69d9e0452bf0f73103)
- Move Superuser/Superuser/jni/su/* to root
- Move Superuser/jni/sqlite3/* to sqlite3

db.c

@@ -0,0 +1,105 @@
+/*
+** Copyright 2013, Koushik Dutta (@koush)
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <limits.h>
+#include <sqlite3.h>
+#include <time.h>
+
+#include "su.h"
+
+struct callback_data_t {
+    struct su_context *ctx;
+    policy_t policy;
+};
+
+static int database_callback(void *v, int argc, char **argv, char **azColName){
+    struct callback_data_t *data = (struct callback_data_t *)v;
+    int command_match = 0;
+    policy_t policy = DENY;
+    int i;
+    time_t until = 0;
+    for(i = 0; i < argc; i++) {
+        if (strcmp(azColName[i], "policy") == 0) {
+            if (argv[i] == NULL) {
+                policy = DENY;
+            }
+            if (strcmp(argv[i], "allow") == 0) {
+                policy = ALLOW;
+            }
+            else if (strcmp(argv[i], "interactive") == 0) {
+                policy = INTERACTIVE;
+            }
+            else {
+                policy = DENY;
+            }
+        }
+        else if (strcmp(azColName[i], "command") == 0) {
+            // null or empty command means to match all commands (whitelist all from uid)
+            command_match = argv[i] == NULL || strlen(argv[i]) == 0 || strcmp(argv[i], get_command(&(data->ctx->to))) == 0;
+        }
+        else if (strcmp(azColName[i], "until") == 0) {
+            if (argv[i] != NULL) {
+                until = atoi(argv[i]);
+            }
+        }
+    }
+
+    // check for command match
+    if (command_match) {
+        // also make sure this policy has not expired
+        if (until == 0 || until > time(NULL)) {
+            if (policy == DENY) {
+                data->policy = DENY;
+                return -1;
+            }
+
+            data->policy = ALLOW;
+            // even though we allow, continue, so we can see if there's another policy
+            // that denies...
+        }
+    }
+    
+    return 0;
+}
+
+policy_t database_check(struct su_context *ctx) {
+    sqlite3 *db = NULL;
+    
+    char query[512];
+    snprintf(query, sizeof(query), "select policy, until, command from uid_policy where uid=%d", ctx->from.uid);
+    int ret = sqlite3_open_v2(ctx->user.database_path, &db, SQLITE_OPEN_READONLY, NULL);
+    if (ret) {
+        LOGE("sqlite3 open failure: %d", ret);
+        sqlite3_close(db);
+        return INTERACTIVE;
+    }
+    
+    int result;
+    char *err = NULL;
+    struct callback_data_t data;
+    data.ctx = ctx;
+    data.policy = INTERACTIVE;
+    ret = sqlite3_exec(db, query, database_callback, &data, &err);
+    sqlite3_close(db);
+    if (err != NULL) {
+        LOGE("sqlite3_exec: %s", err);
+        return DENY;
+    }
+
+    return data.policy;
+}