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dircheck.c
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dircheck.c
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#include <dirent.h>
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#include <libxml2/libxml/encoding.h>
#include <libxml2/libxml/parser.h>
#include <libxml2/libxml/tree.h>
#include <stdbool.h>
#include "dircheck.h"
#include "sha1.h"
#define MAX_PATH_LENGTH 128
#define MAX_READ_SIZE 1024
#define SHA_DIGEST_LENGTH 20
#define ENCODING "UTF-8"
// TODO REFACTOR AND MOVE TO HEADER
bool compare_sha(const char *filename, const char *filesha){
char output[MAX_READ_SIZE];
memset(output,0,MAX_READ_SIZE);
int countRead = 0;
read_file(filename, output, &countRead);
// get sha code
char sha[SHA_DIGEST_LENGTH*2 + 1];
memset(sha,0,SHA_DIGEST_LENGTH*2 + 1);
get_sha(output,sha, countRead);
return (strcmp(filesha,sha) == 0);
}
bool file_exists (const char *filename){
struct stat buffer;
return (stat (filename, &buffer) == 0 && S_ISREG(buffer.st_mode));
}
bool dir_exists (const char *filename){
struct stat buffer;
return (stat (filename, &buffer) == 0 && S_ISDIR(buffer.st_mode));
}
char *get_attribute(xmlAttr* attr){
while(attr){
if(!xmlStrcmp(attr->name,(const xmlChar *)"sha")){
return (char *)attr->children->content;
}
attr = attr->next;
}
return NULL;
}
void dfs(xmlNode *a_node,const char *path) {
xmlNode *cur_node = a_node;
while(cur_node != NULL){
char full_path[128+1] = {0};
strcpy(full_path, path);
if ((!xmlStrcmp(cur_node->name, (const xmlChar *)"DIRECTORY"))){
strcat(full_path, "/");
strcat(full_path,(char *)cur_node->properties->children->content);
if(!dir_exists(full_path)){
fprintf(stdout,"Directory deleted: %s\n",full_path);
}
dfs(cur_node->children, full_path);
}
if ((!xmlStrcmp(cur_node->name, (const xmlChar *)"FILE"))){
strcat(full_path, "/");
strcat(full_path,(char *)cur_node->properties->children->content);
if(!file_exists(full_path)){
fprintf(stdout,"File deleted: %s\n",full_path);
} else {
if(!compare_sha(full_path,get_attribute(cur_node->properties))){
fprintf(stdout,"File changed: %s\n", full_path);
}
}
}
cur_node = cur_node->next;
}
}
int read_xml(const char *filename){
xmlDoc *doc = NULL;
xmlNode *root_element = NULL;
/*
* this initialize the library and check potential ABI mismatches
* between the version it was compiled for and the actual shared
* library used.
*/
LIBXML_TEST_VERSION
/*parse the file and get the DOM */
doc = xmlReadFile(filename, NULL, 0);
if (doc == NULL) {
fprintf(stderr,"error: could not parse file %s\n", filename);
return 1;
}
/*Get the root element node */
root_element = xmlDocGetRootElement(doc);
// printf("TESTING THIS ROOT PATH %s\n", (char *)root_element->properties->children->content);
dfs(root_element->children, (char *)root_element->properties->children->content);
/*free the document */
xmlFreeDoc(doc);
/*
*Free the global variables that may
*have been allocated by the parser.
*/
xmlCleanupParser();
return 0;
}
void split(const char *path, char *root, char *repo){
unsigned int i = 0;
unsigned int j = 0;
unsigned int backslash_index = 0;
while(path[i] != '\0'){
if(path[i] == '/') {
backslash_index = i;
j = 0;
} else {
repo[j] = path[i];
++j;
}
root[i] = path[i];
++i;
}
root[backslash_index] = 0;
repo[j] = 0;
//printf("root %s, repo %s\n", root, repo);
}
//
int read_file(const char *filename, char *output, int *countRead){
FILE *pFileRead = NULL;
// free pFileRead#1
pFileRead = fopen(filename, "rb");
if(pFileRead == NULL){
perror("Error reading file");
return 1;
}
//read maximum MAX_READ_SIZE bytes
*countRead = fread(output,1,MAX_READ_SIZE,pFileRead);
if(ferror(pFileRead)){
perror("Error reading file\n");
fclose(pFileRead); // free all resources, pFileRead#1
return 1;
}
// free all resources, pFileRead#1
fclose(pFileRead);
return 0;
}
int get_sha(const char *input, char *output, const int countRead){
unsigned char result[SHA_DIGEST_LENGTH];
SHA_CTX ctx;
SHAInit(&ctx);
SHAUpdate(&ctx,(unsigned char*)input, countRead);
SHAFinal(result,&ctx);
for (unsigned int i=0; i< SHA_DIGEST_LENGTH; i++){
sprintf(&(output[i*2]),"%02x", result[i]);
}
return 0;
}
int structure_tag(xmlTextWriterPtr writer, const char *rootname){
if(xmlTextWriterStartElement(writer, BAD_CAST "STRUCTURE") < 0){
return 1;
}
if(xmlTextWriterWriteAttribute(writer, BAD_CAST "root",
BAD_CAST rootname) < 0) {
return 1;
}
return 0;
}
int directory_tag(xmlTextWriterPtr writer, const char *dirname){
if(xmlTextWriterStartElement(writer,BAD_CAST "DIRECTORY") < 0){
return 1;
}
if(xmlTextWriterWriteAttribute(writer, BAD_CAST "name",
BAD_CAST dirname) < 0) {
return 1;
}
return 0;
}
int close_tag(xmlTextWriterPtr writer){
if (xmlTextWriterEndElement(writer) < 0){
return 1;
}
return 0;
}
int file_tag(xmlTextWriterPtr writer, const char *filename, const char *sha){
if(xmlTextWriterStartElement(writer,BAD_CAST "FILE") < 0){
return 1;
}
if(xmlTextWriterWriteAttribute(writer, BAD_CAST "name",
BAD_CAST filename) < 0) {
return 1;
}
if(xmlTextWriterWriteAttribute(writer, BAD_CAST "sha",
BAD_CAST sha) < 0) {
return 1;
}
if(xmlTextWriterEndElement(writer) < 0){
return 1;
}
return 0;
}
int travers_dirs(xmlTextWriterPtr writer, const char *path, int recursive)
{
struct dirent *direntp = NULL;
DIR *dirp = NULL;
size_t path_len;
// check input parameters
if (!path){
return 1;
}
path_len = strlen(path);
if (!path || !path_len || (path_len > MAX_PATH_LENGTH)){
return 1;
}
// open directory, free this #1
dirp = opendir(path);
if (dirp == NULL) {
return 1;
}
while ((direntp = readdir(dirp)) != NULL) {
// for every directory entry
struct stat fstat;
char full_name[MAX_PATH_LENGTH + 1];
// calculate full name, check we are in file length limts
if ((path_len + strlen(direntp->d_name)+1) > MAX_PATH_LENGTH){
if ((strcmp(direntp->d_name, ".") == 0) ||
(strcmp(direntp->d_name, "..") == 0)) {
continue;
}
fprintf(stderr, "Path %s/%s is more than 128 characters long.\n", path,direntp->d_name);
continue;
}
strcpy(full_name, path);
if (full_name[path_len - 1] != '/'){
strcat(full_name, "/");
}
strcat(full_name, direntp->d_name);
// ignore special directories
if ((strcmp(direntp->d_name, ".") == 0) ||
(strcmp(direntp->d_name, "..") == 0)) {
continue;
}
// is it directory or file
if (stat(full_name, &fstat) < 0) {
continue;
}
// file
if (S_ISREG(fstat.st_mode)) {
char output[MAX_READ_SIZE];
memset(output,0,MAX_READ_SIZE);
int countRead = 0;
// ignore files that couldn't be opened
if(read_file(full_name, output, &countRead) != 0){
continue;
}
// get sha code
char sha[SHA_DIGEST_LENGTH*2 + 1];
memset(sha,0,SHA_DIGEST_LENGTH*2 + 1);
get_sha(output,sha, countRead);
// write down file element
if(file_tag(writer, direntp->d_name, sha) != 0) {
closedir(dirp); //free #1
return 1;
}
}
// directory
if (S_ISDIR(fstat.st_mode)) {
// write down directory element
if(directory_tag(writer,direntp->d_name) != 0){
closedir(dirp); //free #1
return 1;
}
// recursive call
if (recursive) {
travers_dirs(writer,full_name, 1);
}
// tide after recursion close all tags
close_tag(writer);
}
}
// free all resources, #1
closedir(dirp);
return 0;
}
int generate_xml(const char *dirname,const char *filename){
/*
* this initialize the library and check potential ABI mismatches
* between the version it was compiled for and the actual shared
* library used.
*/
LIBXML_TEST_VERSION
// free writer#1
xmlTextWriterPtr writer = xmlNewTextWriterFilename(filename, 0);
if (writer == NULL) {
fprintf(stderr,"Error creating the xml writer\n");
exit(EXIT_FAILURE);
}
// xml header
if (xmlTextWriterStartDocument(writer, NULL, ENCODING, NULL) < 0) {
free_xmlTextWriter(writer);
return 1; //free all resources, writer#1
}
char *root = (char *) calloc(1,128);
char *repo = (char *) calloc(1,128);
split(dirname, root, repo);
// root dir
if (structure_tag(writer, root) != 0) {
free_xmlTextWriter(writer);
return 1; //free all resources, writer#1
}
// repository dir
if (directory_tag(writer, repo) != 0) {
free_xmlTextWriter(writer);
return 1; //free all resources, writer#1
}
// recursive traversing directories
if (travers_dirs(writer,dirname,1) != 0) {
free_xmlTextWriter(writer);
return 1; //free all resources, writer#1
}
// finish all tags
if (xmlTextWriterEndDocument(writer) < 0) {
free_xmlTextWriter(writer);
return 1; //free all resources, writer#1
}
//free all resources, writer#1
free_xmlTextWriter(writer);
free(root);
free(repo);
return 0;
}
void free_xmlTextWriter(xmlTextWriterPtr writer){
xmlFreeTextWriter(writer);
// cleanup function for the XML library
xmlCleanupParser();
// this is to debug memory for regression tests
xmlCleanupCharEncodingHandlers();
xmlMemoryDump();
}