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//
// (c) Evadne Wu, Faria Education Group / International Baccalaureate 2019
//
#include <errno.h>
#include <getopt.h>
#include <libgen.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <magic.h>
#define USAGE "--file <path/to/magic.mgc> [--file <path/to/custom.mgc> ...]"
#define DELIMINTER "\t"
#define ANSI_INFO "\x1b[37m" // gray
#define ANSI_OK "\x1b[32m" // green
#define ANSI_ERROR "\x1b[31m" // red
#define ANSI_IGNORE "\x1b[90m" // red
#define ANSI_RESET "\x1b[0m"
#define MAGIC_FLAGS_COMMON (MAGIC_CHECK|MAGIC_ERROR)
magic_t magic_setup(int flags);
void setup_environment();
void setup_options(int argc, char **argv);
void setup_options_file(char *optarg);
void setup_system();
void process_line(char *line);
void process_file(char *path);
void print_info(const char *format, ...);
void print_ok(const char *format, ...);
void print_error(const char *format, ...);
struct file {
char *path;
struct file *next;
};
static struct file* magic_database;
static magic_t magic_mime_type; // MAGIC_MIME_TYPE
static magic_t magic_mime_encoding; // MAGIC_MIME_ENCODING
static magic_t magic_type_name; // MAGIC_NONE
int main (int argc, char **argv) {
setup_environment();
setup_options(argc, argv);
setup_system();
printf("ok\n");
fflush(stdout);
char line[4096];
while (fgets(line, 4096, stdin)) {
process_line(line);
}
return 0;
}
void setup_environment() {
// setbuf(stdout, NULL);
opterr = 0;
}
void setup_options(int argc, char **argv) {
const char *option_string = "f:";
static struct option long_options[] = {
{"file", required_argument, 0, 'f'},
{0, 0, 0, 0}
};
int option_character;
while (1) {
int option_index = 0;
option_character = getopt_long(argc, argv, option_string, long_options, &option_index);
if (-1 == option_character) {
break;
}
switch (option_character) {
case 'f': {
setup_options_file(optarg);
break;
}
case '?':
default: {
print_info("%s %s\n", basename(argv[0]), USAGE);
exit(1);
break;
}
}
}
}
void setup_options_file(char *optarg) {
print_info("Magic Database: %s", optarg);
if (0 != access(optarg, R_OK)) {
print_error("no_database");
exit(1);
}
struct file *next = malloc(sizeof(struct file));
size_t path_length = strlen(optarg) + 1;
char *path = malloc(path_length);
memcpy(path, optarg, path_length);
next->path = path;
next->next = magic_database;
magic_database = next;
}
void setup_system() {
print_info("Starting System");
magic_mime_encoding = magic_setup(MAGIC_FLAGS_COMMON|MAGIC_MIME_ENCODING);
magic_mime_type = magic_setup(MAGIC_FLAGS_COMMON|MAGIC_MIME_TYPE);
magic_type_name = magic_setup(MAGIC_FLAGS_COMMON|MAGIC_NONE);
}
magic_t magic_setup(int flags) {
magic_t magic = magic_open(flags);
struct file *current_database = magic_database;
while (current_database) {
if (isatty(STDERR_FILENO)) {
fprintf(stderr, ANSI_IGNORE);
}
magic_load(magic, current_database->path);
if (isatty(STDERR_FILENO)) {
fprintf(stderr, ANSI_RESET);
}
current_database = current_database->next;
}
return magic;
}
void process_line(char *line) {
char path[4096];
if (0 == strcmp(line, "exit\n")) {
exit(0);
}
if (1 != sscanf(line, "file; %[^\n]s", path)) {
print_error("bad_path");
return;
}
if (0 != access(path, R_OK)) {
print_error("no_file");
return;
}
process_file(path);
}
void process_file(char *path) {
const char *mime_type_result = magic_file(magic_mime_type, path);
const char *mime_type_error = magic_error(magic_mime_type);
const char *mine_encoding_result = magic_file(magic_mime_encoding, path);
const char *mine_encoding_error = magic_error(magic_mime_encoding);
const char *type_name_result = magic_file(magic_type_name, path);
const char *type_name_error = magic_error(magic_type_name);
if (mime_type_error) {
print_error(mime_type_error);
return;
}
if (mine_encoding_error) {
print_error(mine_encoding_error);
return;
}
if (type_name_error) {
print_error(type_name_error);
return;
}
print_ok("%s%s%s%s%s", mime_type_result, DELIMINTER, mine_encoding_result, DELIMINTER, type_name_result);
}
void print_info(const char *format, ...) {
if (!isatty(STDOUT_FILENO)) {
return;
}
printf(ANSI_INFO "[INFO] " ANSI_RESET);
va_list arguments;
va_start(arguments, format);
vprintf(format, arguments);
va_end(arguments);
printf("\n");
}
void print_ok(const char *format, ...) {
if (isatty(STDOUT_FILENO)) {
printf(ANSI_OK "[OK] " ANSI_RESET);
} else {
printf("ok; ");
}
va_list arguments;
va_start(arguments, format);
vprintf(format, arguments);
va_end(arguments);
printf("\n");
fflush(stdout);
}
void print_error(const char *format, ...) {
if (isatty(STDERR_FILENO)) {
fprintf(stderr, ANSI_ERROR "[ERROR] " ANSI_RESET);
} else {
fprintf(stderr, "error; ");
}
va_list arguments;
va_start(arguments, format);
vfprintf(stderr, format, arguments);
va_end(arguments);
fprintf(stderr, "\n");
fflush(stderr);
}
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