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diff --git a/src/apprentice.c b/src/apprentice.c
index 6d164f8..31e7ab2 100644
--- a/src/apprentice.c
+++ b/src/apprentice.c
@@ -1,362 +1,356 @@
//
// The Sorcerer’s Apprentice
//
// To use this program, compile it with dynamically linked libmagic, as mirrored
-// at https://github.com/threatstack/libmagic. You may install it with apt-get, yum or brew.
-// Refer to the Makefile for further reference.
+// at https://github.com/threatstack/libmagic. You may install it with apt-get,
+// yum or brew. Refer to the Makefile for further reference.
//
-// This program is designed to run interactively as a backend daemon to the GenMagic library,
-// and follows the command line pattern:
+// This program is designed to run interactively as a backend daemon to the
+// GenMagic library, and follows the command line pattern:
//
// $ apprentice --database-file <file> --database-default
//
-// Where each argument either refers to a compiled or uncompiled magic database, or the default
-// database. They will be loaded in the sequence that they were specified. Note that you must
-// specify at least one database.
-// Erlang Term
+// Where each argument either refers to a compiled or uncompiled magic database,
+// or the default database. They will be loaded in the sequence that they were
+// specified. Note that you must specify at least one database. Erlang Term
//
// -- main: send atom ready
// enter loop
//
// -- while
// get {:file, path} -> process_file -> ok | error
// {:bytes, path} -> process_bytes -> ok | error
// ok: {:ok, {type, encoding, name}}
// error: {:error, :badarg} | {:error, {errno, String.t()}}
// {:stop, _} -> exit(ERROR_OK) -> exit 0
//
+#include <ei.h>
#include <errno.h>
#include <getopt.h>
#include <libgen.h>
+#include <magic.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <sys/types.h>
#include <sys/stat.h>
+#include <sys/types.h>
#include <unistd.h>
-#include <ei.h>
-#include <magic.h>
#define USAGE "[--database-file <path/to/magic.mgc> | --database-default, ...]"
#define DELIMITER "\t"
#define ERROR_OK 0
#define ERROR_NO_DATABASE 1
#define ERROR_NO_ARGUMENT 2
#define ERROR_MISSING_DATABASE 3
#define ERROR_BAD_TERM 4
#define ERROR_EI 5
-#define ANSI_INFO "\x1b[37m" // gray
-#define ANSI_OK "\x1b[32m" // green
-#define ANSI_ERROR "\x1b[31m" // red
+#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 ANSI_RESET "\x1b[0m"
-#define MAGIC_FLAGS_COMMON (MAGIC_CHECK|MAGIC_ERROR)
+#define MAGIC_FLAGS_COMMON (MAGIC_CHECK | MAGIC_ERROR)
magic_t magic_setup(int flags);
typedef char byte;
int read_cmd(byte *buf);
int write_cmd(byte *buf, int len);
void setup_environment();
void setup_options(int argc, char **argv);
void setup_options_file(char *optarg);
void setup_options_default();
void setup_system();
int process_command(byte *buf);
void process_line(char *line);
void process_file(char *path, ei_x_buff *result);
void error(ei_x_buff *result, const char *error);
struct magic_file {
struct magic_file *prev;
struct magic_file *next;
char *path;
};
-static struct magic_file* magic_database;
-static magic_t magic_mime_type; // MAGIC_MIME_TYPE
+static struct magic_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
+static magic_t magic_type_name; // MAGIC_NONE
-int main (int argc, char **argv) {
+int main(int argc, char **argv) {
ei_init();
setup_environment();
setup_options(argc, argv);
setup_system();
ei_x_buff ok_buf;
- if (ei_x_new_with_version(&ok_buf) || ei_x_encode_atom(&ok_buf, "ready")) return 5;
+ if (ei_x_new_with_version(&ok_buf) || ei_x_encode_atom(&ok_buf, "ready"))
+ return 5;
write_cmd(ok_buf.buff, ok_buf.index);
if (ei_x_free(&ok_buf) != 0)
- exit(ERROR_EI);
+ exit(ERROR_EI);
byte buf[5000];
while (read_cmd(buf) > 0) {
process_command(buf);
}
return 0;
}
int process_command(byte *buf) {
ei_x_buff result;
char atom[128];
int index, version, arity;
index = 0;
if (ei_decode_version(buf, &index, &version) != 0)
- exit(ERROR_BAD_TERM);
+ exit(ERROR_BAD_TERM);
// Initialize result
- if (ei_x_new_with_version(&result) || ei_x_encode_tuple_header(&result, 2)) exit(ERROR_EI);
+ if (ei_x_new_with_version(&result) || ei_x_encode_tuple_header(&result, 2))
+ exit(ERROR_EI);
if (ei_decode_tuple_header(buf, &index, &arity) != 0) {
error(&result, "badarg");
return 1;
}
if (arity != 2) {
error(&result, "badarg");
return 1;
}
if (ei_decode_atom(buf, &index, atom) != 0) {
error(&result, "badarg");
return 1;
}
if (strncmp(atom, "file", 3) == 0) {
int pathtype;
int pathsize;
char path[4097];
ei_get_type(buf, &index, &pathtype, &pathsize);
if (pathtype == ERL_BINARY_EXT && pathsize < 4096) {
long bin_length;
ei_decode_binary(buf, &index, path, &bin_length);
path[pathsize] = '\0';
process_file(path, &result);
} else {
error(&result, "badarg");
return 1;
}
} else if (strncmp(atom, "bytes", 3) == 0) {
- ei_x_encode_atom(&result, "ok");
- ei_x_encode_atom(&result, "bytes_not_implemented");
+ ei_x_encode_atom(&result, "ok");
+ ei_x_encode_atom(&result, "bytes_not_implemented");
} else if (strncmp(atom, "stop", 3) == 0) {
exit(ERROR_OK);
} else {
error(&result, "badarg");
return 1;
}
write_cmd(result.buff, result.index);
if (ei_x_free(&result) != 0)
- exit(ERROR_EI);
+ exit(ERROR_EI);
return 0;
}
-void setup_environment() {
- opterr = 0;
-}
+void setup_environment() { opterr = 0; }
void setup_options(int argc, char **argv) {
const char *option_string = "f:";
static struct option long_options[] = {
- {"database-file", required_argument, 0, 'f'},
- {"database-default", no_argument, 0, 'd'},
- {0, 0, 0, 0}
- };
+ {"database-file", required_argument, 0, 'f'},
+ {"database-default", no_argument, 0, 'd'},
+ {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);
+ 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 'd': {
- setup_options_default();
- break;
- }
- case '?':
- default: {
- exit(ERROR_NO_ARGUMENT);
- break;
- }
+ case 'f': {
+ setup_options_file(optarg);
+ break;
+ }
+ case 'd': {
+ setup_options_default();
+ break;
+ }
+ case '?':
+ default: {
+ exit(ERROR_NO_ARGUMENT);
+ break;
+ }
}
}
}
void setup_options_file(char *optarg) {
if (0 != access(optarg, R_OK)) {
exit(ERROR_MISSING_DATABASE);
}
struct magic_file *next = malloc(sizeof(struct magic_file));
size_t path_length = strlen(optarg) + 1;
char *path = malloc(path_length);
memcpy(path, optarg, path_length);
next->path = path;
next->prev = magic_database;
if (magic_database) {
magic_database->next = next;
}
magic_database = next;
}
void setup_options_default() {
struct magic_file *next = malloc(sizeof(struct magic_file));
next->path = NULL;
next->prev = magic_database;
if (magic_database) {
magic_database->next = next;
}
magic_database = next;
}
void setup_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_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 magic_file *current_database = magic_database;
if (!current_database) {
exit(ERROR_NO_DATABASE);
}
while (current_database->prev) {
current_database = current_database->prev;
}
while (current_database) {
magic_load(magic, current_database->path);
- if (isatty(STDERR_FILENO)) {
- fprintf(stderr, ANSI_RESET);
- }
current_database = current_database->next;
}
return magic;
}
void process_file(char *path, ei_x_buff *result) {
const char *mime_type_result = magic_file(magic_mime_type, path);
const char *mime_type_error = magic_error(magic_mime_type);
int mime_type_errno = magic_errno(magic_mime_type);
if (mime_type_errno > 0) {
ei_x_encode_atom(result, "error");
ei_x_encode_tuple_header(result, 2);
long errlon = (long)mime_type_errno;
ei_x_encode_long(result, errlon);
ei_x_encode_binary(result, mime_type_error, strlen(mime_type_error));
return;
}
const char *mime_encoding_result = magic_file(magic_mime_encoding, path);
const char *mime_encoding_error = magic_error(magic_mime_encoding);
int mime_encoding_errno = magic_errno(magic_mime_encoding);
if (mime_encoding_error) {
ei_x_encode_atom(result, "error");
ei_x_encode_tuple_header(result, 2);
long errlon = (long)mime_encoding_errno;
ei_x_encode_long(result, errlon);
- ei_x_encode_binary(result, mime_encoding_error, strlen(mime_encoding_error));
+ ei_x_encode_binary(result, mime_encoding_error,
+ strlen(mime_encoding_error));
return;
}
const char *type_name_result = magic_file(magic_type_name, path);
const char *type_name_error = magic_error(magic_type_name);
int type_name_errno = magic_errno(magic_type_name);
if (type_name_error) {
ei_x_encode_atom(result, "error");
ei_x_encode_tuple_header(result, 2);
long errlon = (long)type_name_errno;
ei_x_encode_long(result, errlon);
ei_x_encode_binary(result, type_name_error, strlen(type_name_error));
return;
}
ei_x_encode_atom(result, "ok");
ei_x_encode_tuple_header(result, 3);
ei_x_encode_binary(result, mime_type_result, strlen(mime_type_result));
- ei_x_encode_binary(result, mime_encoding_result, strlen(mime_encoding_result));
+ ei_x_encode_binary(result, mime_encoding_result,
+ strlen(mime_encoding_result));
ei_x_encode_binary(result, type_name_result, strlen(type_name_result));
return;
}
// From https://erlang.org/doc/tutorial/erl_interface.html
-int read_exact(byte *buf, int len)
-{
- int i, got=0;
+int read_exact(byte *buf, int len) {
+ int i, got = 0;
do {
- if ((i = read(0, buf+got, len-got)) <= 0){
- return(i);
- }
+ if ((i = read(0, buf + got, len - got)) <= 0) {
+ return (i);
+ }
got += i;
- } while (got<len);
+ } while (got < len);
- return(len);
+ return (len);
}
-int write_exact(byte *buf, int len)
-{
+int write_exact(byte *buf, int len) {
int i, wrote = 0;
do {
- if ((i = write(1, buf+wrote, len-wrote)) <= 0)
+ if ((i = write(1, buf + wrote, len - wrote)) <= 0)
return (i);
wrote += i;
- } while (wrote<len);
+ } while (wrote < len);
return (len);
}
-int read_cmd(byte *buf)
-{
+int read_cmd(byte *buf) {
int len;
if (read_exact(buf, 2) != 2)
- return(-1);
+ return (-1);
len = (buf[0] << 8) | buf[1];
return read_exact(buf, len);
}
-int write_cmd(byte *buf, int len)
-{
+int write_cmd(byte *buf, int len) {
byte li;
li = (len >> 8) & 0xff;
write_exact(&li, 1);
-
+
li = len & 0xff;
write_exact(&li, 1);
return write_exact(buf, len);
}
void error(ei_x_buff *result, const char *error) {
ei_x_encode_atom(result, "error");
ei_x_encode_atom(result, error);
write_cmd(result->buff, result->index);
if (ei_x_free(result) != 0)
- exit(ERROR_EI);
+ exit(ERROR_EI);
}

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