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key_db.c
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key_db.c
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#include <sqlite3.h>
#include <linux/types.h>
#include <limits.h>
#include <string.h>
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include "uthash.h"
#include <inttypes.h>
#define PREP_SQL(QUERY) res = sqlite3_prepare_v2(db, QUERY, -1, &pstmt, NULL); \
if (res != SQLITE_OK) { \
fprintf(stderr, "SQL prep error: %s\n", sqlite3_errmsg(db)); \
sqlite3_close(db); \
db = NULL; \
return -res; \
}
#define EXEC_SQL res = sqlite3_step(pstmt); \
if (res != SQLITE_DONE) { \
fprintf(stderr, "SQL exec error: %s\n", sqlite3_errmsg(db)); \
sqlite3_finalize(pstmt); \
sqlite3_close(db); \
db = NULL; \
return -res; \
} \
sqlite3_finalize(pstmt);
sqlite3 *db;
static int callback(void *NotUsed, int argc, char **argv, char **azColName)
{ /* debug callback */
int i;
for(i = 0; i<argc; i++) {
printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
}
printf("\n");
return 0;
}
int create_tables()
{
char* sql1 = "CREATE TABLE MappingTable ( \
key BLOB, \
path TEXT NOT NULL UNIQUE, \
PRIMARY KEY(key) \
);";
char* sql2 = "CREATE INDEX idx_key ON MappingTable (key); \
CREATE INDEX idx_path ON MappingTable (path);";
int res;
char* err_msg = NULL;
res = sqlite3_exec(db, sql1, callback, 0, &err_msg);
if(res != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", err_msg);
sqlite3_free(err_msg);
sqlite3_close(db);
db = NULL;
return -res;
}
res = sqlite3_exec(db, sql2, callback, 0, &err_msg);
if(res != SQLITE_OK) {
fprintf(stderr, "SQL error: %s\n", err_msg);
sqlite3_free(err_msg);
sqlite3_close(db);
db = NULL;
return -res;
}
return 0;
}
int create_db()
{
int res;
res = sqlite3_open("keys.db", &db);
if( res ) {
fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);
db = NULL;
return -res;
}
return create_tables();
}
int open_db()
{
int res;
res = sqlite3_open_v2("keys.db", &db, SQLITE_OPEN_READWRITE, NULL);
if( res ) {
return create_db();
}
return 0;
}
void close_db()
{
sqlite3_close_v2(db);
db = NULL;
}
int generate_key(char* path, void* ptr)
{
char* sql1 = "SELECT key FROM MappingTable \
WHERE path = ?1";
char* sql2 = "INSERT INTO MappingTable \
VALUES(?1, ?2)";
int res, len = strlen(path), i;
FILE* fout;
const void* blob;
char* new_key = NULL;
int first = 0;
__u64 val = 0;
char key[8];
sqlite3_stmt *pstmt = NULL;
time_t now;
time(&now);
PREP_SQL(sql1)
sqlite3_bind_text(pstmt, 1, path, len, NULL);
res = sqlite3_step(pstmt);
if (res == SQLITE_ROW) { /* this path exists */
blob = sqlite3_column_blob(pstmt, 0);
memcpy(ptr, blob, sqlite3_column_bytes(pstmt, 0));
sqlite3_finalize(pstmt);
return 0;
}
else if (res != SQLITE_DONE) {
fprintf(stderr, "SQL exec error: %s\n", sqlite3_errmsg(db));
sqlite3_finalize(pstmt);
sqlite3_close(db);
db = NULL;
return -res;
}
sqlite3_finalize(pstmt);
HASH_JEN(path, len, val);
memcpy(key, &val, sizeof(val));
do {
PREP_SQL(sql2)
sqlite3_bind_blob(pstmt, 1, (void*)&key, sizeof(__le64), NULL);
sqlite3_bind_text(pstmt, 2, path, len, NULL);
res = sqlite3_step(pstmt);
sqlite3_finalize(pstmt);
/*fprintf(stderr, "Key generation res: %d\n", res);
fprintf(stderr, "Key generated: %"PRIx64, (unsigned long) (key>>64));
fprintf(stderr, "%"PRIx64"\n", (unsigned long) key);
fprintf(stderr, "Path is: %s\n", path);
fprintf(stderr, "Len of path is: %d Len of half path is: %d\n", len, len/2);*/
if (res != SQLITE_CONSTRAINT) break;
if (!first++) {
fout = fopen("cols","a");
fprintf(fout, "\n");
fclose(fout);
srand(time(NULL));
}
if (first > 10)
{
return -res;
}
new_key = (char*) &key;
for(i = 0; i < sizeof(__le64); i++) new_key[i] += (rand() % 256); /* add randomness */
} while(1); /* TODO: Should have a set number of retries, this will loop infinitely */
if (res != SQLITE_DONE) {
fprintf(stderr, "SQL exec error: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);
db = NULL;
return -res;
}
memcpy(ptr, key, 8);
return 0;
}
int get_key(char* path, void* ptr)
{
char* sql = "SELECT key FROM MappingTable \
WHERE path = ?1";
const void* blob;
int res;
sqlite3_stmt *pstmt = NULL;
PREP_SQL(sql)
sqlite3_bind_text(pstmt, 1, path, strlen(path), NULL);
res = sqlite3_step(pstmt);
if (res == SQLITE_DONE) { /* path doesn't exist in db, not fatal */
sqlite3_finalize(pstmt);
fprintf(stderr, "SQL ERR is: %d", res);
return -res;
}
else if (res != SQLITE_ROW) {
fprintf(stderr, "SQL exec error: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);
db = NULL;
return -res;
}
blob = sqlite3_column_blob(pstmt, 0);
memcpy(ptr, blob, sqlite3_column_bytes(pstmt, 0));
sqlite3_finalize(pstmt);
return 0;
}
int delete_key(char* path)
{
char* sql = "DELETE FROM MappingTable \
WHERE path = ?1";
int res;
sqlite3_stmt *pstmt = NULL;
PREP_SQL(sql)
sqlite3_bind_text(pstmt, 1, path, strlen(path), NULL);
EXEC_SQL
return 0;
}