///
/// Returns the file type of a given input file.
/// fn is provided so that error messages can be printed.
///
hashlist::hashfile_format hashlist::identify_format(class display *ocb,
const std::string &fn,
FILE *handle)
{
char buf[MAX_STRING_LENGTH];
// Find the header
if ((fgets(buf,MAX_STRING_LENGTH,handle)) == NULL) {
return file_unknown;
}
chop_line(buf);
if ( ! STRINGS_EQUAL(buf,HASHDEEP_HEADER_10)) {
return file_unknown;
}
// Find which hashes are in this file
if ((fgets(buf,MAX_STRING_LENGTH,handle)) == NULL) {
return file_unknown;
}
chop_line(buf);
// We don't use STRINGS_EQUAL here because we only care about
// the first ten characters for right now.
if (strncasecmp("%%%% size,",buf,10)) {
return file_unknown;
}
/**
* Remember previously loaded hashes.
*/
std::string previously_enabled_algorithms = last_enabled_algorithms;
// Skip the "%%%% size," when parsing the list of hashes
enable_hashing_algorithms_from_hashdeep_file(ocb,fn,buf + 10);
// If the set of hashes now in use doesn't match those previously in use,
// give a warning.
if (previously_enabled_algorithms.size()>0
&& previously_enabled_algorithms != last_enabled_algorithms){
if(ocb) ocb->error("%s: Hashes not in same format as previously loaded",
fn.c_str());
}
return file_hashdeep_10;
}
/// @brief Read the next entry in a file of known hashes and convert
/// it to a Filedata
///
/// @param s State variable
/// @param f Structure where to store the data we read
///
/// @return Returns true if there is no entry to read or on error.
/// Otherwise, false.
bool sig_file_next(state *s, Filedata ** f)
{
if (NULL == s or NULL == f or NULL == s->known_handle)
return true;
char buffer[MAX_STR_LEN];
memset(buffer,0,MAX_STR_LEN);
if (NULL == fgets(buffer,MAX_STR_LEN,s->known_handle))
return true;
s->line_number++;
chop_line(buffer);
try
{
*f = new Filedata(std::string(buffer),s->known_fn);
}
catch (std::bad_alloc)
{
// This can happen on a badly formatted line, or a blank one.
// We don't display errors on blank lines.
if (strlen(buffer) > 0)
print_error(s,
"%s: Bad hash in line %llu",
s->known_fn,
s->line_number);
return true;
}
return false;
}
/// Open a file of known hashes and determine if it's valid
///
/// @param s State variable
/// @param fn filename to open
///
/// @return Returns false success, true on error
bool sig_file_open(state *s, const char * fn)
{
if (NULL == s or NULL == fn)
return true;
s->known_handle = fopen(fn,"rb");
if (NULL == s->known_handle)
{
if ( ! (MODE(mode_silent)) )
perror(fn);
return true;
}
// The first line of the file should contain a valid ssdeep header.
char buffer[MAX_STR_LEN];
if (NULL == fgets(buffer,MAX_STR_LEN,s->known_handle))
{
if ( ! (MODE(mode_silent)) )
perror(fn);
fclose(s->known_handle);
return true;
}
chop_line(buffer);
if (strncmp(buffer,SSDEEPV1_0_HEADER,MAX_STR_LEN) and
strncmp(buffer,SSDEEPV1_1_HEADER,MAX_STR_LEN))
{
if ( ! (MODE(mode_silent)) )
print_error(s,"%s: Invalid file header.", fn);
fclose(s->known_handle);
return true;
}
// We've now read the first line
s->line_number = 1;
s->known_fn = strdup(fn);
return false;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Read and parse syslinux config file.
//
// return:
// 0: ok, 1: error
//
int read_config_file(void)
{
FILE *f;
char *s, *t, buf[MAX_CONFIG_LINE_LEN];
unsigned u, menu_idx = 0, label_size = 0, append_size = 0;
menu_t *menu_ptr = NULL, **menu_next = &menu;
menu_default = calloc(1, sizeof *menu_default);
if(!(f = fopen(syslinux_config_file(), "r"))) return 1;
while((s = fgets(buf, sizeof buf, f))) {
chop_line(s);
s = skip_spaces(s);
if(!*s || *s == '#') continue;
t = skip_nonspaces(s);
if(*t) *t++ = 0;
t = skip_spaces(t);
if(!strcasecmp(s, "timeout")) {
timeout = atoi(t);
continue;
}
if(!strcasecmp(s, "default")) {
menu_default->label = strdup(t);
u = strlen(t);
if(u > label_size) label_size = u;
continue;
}
if(!strcasecmp(s, "label")) {
menu_ptr = *menu_next = calloc(1, sizeof **menu_next);
menu_next = &menu_ptr->next;
menu_idx++;
menu_ptr->label = menu_ptr->menu_label = strdup(t);
u = strlen(t);
if(u > label_size) label_size = u;
continue;
}
if(!strcasecmp(s, "kernel") && menu_ptr) {
menu_ptr->kernel = strdup(t);
continue;
}
if(!strcasecmp(s, "linux") && menu_ptr) {
menu_ptr->linux = strdup(t);
continue;
}
if(!strcasecmp(s, "localboot") && menu_ptr) {
menu_ptr->localboot = strdup(t);
continue;
}
if(!strcasecmp(s, "initrd") && menu_ptr) {
menu_ptr->initrd = strdup(t);
continue;
}
if(!strcasecmp(s, "append")) {
(menu_ptr ?: menu_default)->append = strdup(t);
u = strlen(t);
if(u > append_size) append_size = u;
continue;
}
if(!strcasecmp(s, "ipappend")) {
(menu_ptr ?: menu_default)->ipappend = strdup(t);
continue;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Read and parse syslinux config file.
//
// return:
// 0: ok, 1: error
//
int read_config_file(const char *filename)
{
FILE *f;
char *s, *t, buf[MAX_CONFIG_LINE_LEN];
unsigned u, top_level = 0, text = 0;
if(!strcmp(filename, "~")) {
top_level = 1;
filename = syslinux_config_file();
gfx_menu.entries = 0;
gfx_menu.label_size = 0;
gfx_menu.arg_size = 0;
menu_ptr = NULL;
menu_next = &menu;
menu_default = calloc(1, sizeof *menu_default);
}
if(!(f = fopen(filename, "r"))) return 1;
while((s = fgets(buf, sizeof buf, f))) {
chop_line(s);
s = skipspace(s);
if(!*s || *s == '#') continue;
t = skip_nonspaces(s);
if(*t) *t++ = 0;
t = skipspace(t);
if(!strcasecmp(s, "endtext")) {
text = 0;
continue;
}
if (text)
continue;
if(!strcasecmp(s, "timeout")) {
timeout = atoi(t);
continue;
}
if(!strcasecmp(s, "default")) {
menu_default->label = strdup(t);
u = strlen(t);
if(u > gfx_menu.label_size) gfx_menu.label_size = u;
continue;
}
if(!strcasecmp(s, "label")) {
menu_ptr = *menu_next = calloc(1, sizeof **menu_next);
menu_next = &menu_ptr->next;
gfx_menu.entries++;
menu_ptr->label = menu_ptr->menu_label = strdup(t);
u = strlen(t);
if(u > gfx_menu.label_size) gfx_menu.label_size = u;
continue;
}
if(!strcasecmp(s, "kernel") && menu_ptr) {
menu_ptr->kernel = strdup(t);
continue;
}
if(!strcasecmp(s, "linux") && menu_ptr) {
menu_ptr->linux = strdup(t);
continue;
}
if(!strcasecmp(s, "localboot") && menu_ptr) {
menu_ptr->localboot = strdup(t);
continue;
}
if(!strcasecmp(s, "initrd") && menu_ptr) {
menu_ptr->initrd = strdup(t);
continue;
}
if(!strcasecmp(s, "append")) {
(menu_ptr ?: menu_default)->append = strdup(t);
u = strlen(t);
if(u > gfx_menu.arg_size) gfx_menu.arg_size = u;
continue;
}
if(!strcasecmp(s, "ipappend")) {
(menu_ptr ?: menu_default)->ipappend = strdup(t);
continue;
}
//
// Loads a file of known hashes.
// First identifies the file type, then reads the file.
//
hashlist::loadstatus_t
hashlist::load_hash_file(display *ocb,const std::string &fn)
{
loadstatus_t status = loadstatus_ok;
hashfile_format type;
FILE *hl_handle = fopen(fn.c_str(),"rb");
if (NULL == hl_handle)
{
if (ocb)
ocb->error("%s: %s", fn.c_str(), strerror(errno));
return status_file_error;
}
type = identify_format(ocb,fn,hl_handle);
if (file_unknown == type)
{
if (ocb)
ocb->error("%s: Unable to identify file format", fn.c_str());
fclose(hl_handle);
hl_handle = 0;
return status_unknown_filetype;
}
bool contains_bad_lines = false;
bool record_valid;
// We start our counter at line number two for the two lines
// of header we've already read
uint64_t line_number = 2;
// TODO: Read the line directly into a std::string
char line[MAX_STRING_LENGTH];
while (fgets(line,MAX_STRING_LENGTH,hl_handle))
{
line_number++;
// Lines starting with a pound sign are comments and can be ignored
if ('#' == line[0])
continue;
// C++ typically fails with a bad_alloc, but you can make it return null
// http://www.cplusplus.com/reference/std/new/bad_alloc/
// http://www.cplusplus.com/reference/std/new/nothrow/
file_data_t *t = new (std::nothrow) file_data_t();
if (NULL == t)
{
ocb->fatal_error("%s: Out of memory in line %"PRIu64,
fn.c_str(), line_number);
}
chop_line(line);
record_valid = true;
// Convert the input line to a string for easier manipulations
std::string line_as_string(line);
std::vector<std::string> fields = split(line_as_string,',');
size_t column_number;
for (column_number=0 ; column_number<fields.size() ; column_number++)
{
std::string word = fields[column_number];
// The first column should always be the file size
if (0 == column_number)
{
t->file_bytes = (uint64_t)strtoll(word.c_str(),NULL,10);
continue;
}
if (column_number == filename_column)
{
// If the filename contained commas, it was split
// incorrectly by the 'split' statememt above. The filename
// will be split across more than one column.
// As such we need to 'find' everything
// in the string starting with the current location.
// The result should be closer to the end of the string than
// the start, so we can use rfind. (This also avoids a problem
// when the filename is the same as one of the hashes, which
// happens now and again.)
size_t start = line_as_string.rfind(word);
t->file_name = line_as_string.substr(start,std::string::npos);
// This should be the last column, so we break out now.
break;
}
// All other columns should contain a valid hash in hex
if ( !algorithm_t::valid_hash(hash_column[column_number],word))
{
if (ocb)
ocb->error("%s: Invalid %s hash in line %"PRIu64,
fn.c_str(),
hashes[hash_column[column_number]].name.c_str(),
line_number);
contains_bad_lines = true;
record_valid = false;
// Break out (done = true) and then process the next line
break;
}
// Convert the hash to a std::string and save it
lowercase(word);
t->hash_hex[hash_column[column_number]] = word;
}
if (record_valid)
add_fdt(t);
}
fclose(hl_handle);
hl_handle = 0;
if (contains_bad_lines)
return status_contains_bad_hashes;
return status;
}
static Param_Type *create_param_type (char *line)
{
Param_Type *p;
char *name, *type, *mode, *min, *max, *value, *prompt;
p = (Param_Type *) _pf_malloc (sizeof (Param_Type));
if (p == NULL) return NULL;
if (NULL == (p->name = _pf_create_string (line)))
{
goto free_and_return_error;
}
/* p->name is special. See comment in pf.h */
if (-1 == chop_line (line, &name, &type, &mode, &value, &min, &max, &prompt))
{
goto free_and_return_error;
}
p->name[strlen (name)] = 0;
if (type == NULL)
{
p->type = PF_COMMENT_TYPE;
return p;
}
if (-1 == parse_type (type, &p->type))
{
goto free_and_return_error;
}
if (-1 == _pf_parse_mode (mode, &p->mode))
{
goto free_and_return_error;
}
if (min != NULL)
{
if (NULL == (p->min = _pf_unescape_string (min)))
goto free_and_return_error;
}
if (max != NULL)
{
if (NULL == (p->max = _pf_unescape_string (max)))
goto free_and_return_error;
}
if (value != NULL)
{
if (NULL == (p->value = _pf_unescape_string (value)))
goto free_and_return_error;
/* This is a weakness in the definition of parameter files. There
* seems to be NO WAY to have a parameter whose value begins with
* a ')' character. Actually, I think there is but the existing
* practice seems to defeat my solution.
*/
if (*p->value == ')')
p->flags |= PF_INDIRECT_VALUE;
}
if (prompt != NULL)
{
if (NULL == (p->prompt = _pf_unescape_string (prompt)))
goto free_and_return_error;
}
return p;
free_and_return_error:
if ((p != NULL) && (p->name != NULL))
{
pf_error ("Error processing parameter/line %s", p->name);
}
free_param_type (p);
return NULL;
}
