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/*
* src/zonefile.c
* (c) 2021 Jonas Gunz <himself@jonasgunz.de>
* License: MIT
*/
#include "zonefile.h"
int zonefile_string_split(char* _parts[], ssize_t _max, char* _str, char _delim) {
unsigned int i, o, start;
start = 0;
for ( i=0; i < _max; i++ ) {
for ( o=start; _str[o] && _str[o] != ' '; o++ );
_parts[i] = &_str[start];
if(!_str[o])
break;
_str[o] = '\0';
start = o+1;
}
return (int)i + 1;
}
int zonefile_parse_line(database_t *_database, char *_line) {
char *parts[5];
int parts_len, ret, fqdn_len;
char* qname;
uint32_t ttl;
uint16_t type, class;
void* data;
ssize_t data_len;
void* db_entry;
memset(&parts, 0, sizeof(parts));
parts_len = zonefile_string_split(parts, 5, _line, ' ');
if (parts_len != 5) {
LOGPRINTF(_LOG_ERROR, "Statement is incomplete");
return -1;
}
fqdn_len = strlen(parts[0]);
if ( (ret = fqdn_check(parts[0], fqdn_len)) ) {
LOGPRINTF(_LOG_ERROR, "FQDN Contains invalid char at pos %i", ret);
return -1;
}
qname = malloc( (unsigned)fqdn_len+2 );
if ( fqdn_to_qname(parts[0], fqdn_len, qname, fqdn_len+2) < 0) {
LOGPRINTF(_LOG_ERROR, "Failed to convert to QNAME. This is a bug.");
return -1;
}
if ( !(ttl = (uint16_t) atoi(parts[1])) ) {
LOGPRINTF(_LOG_ERROR, "Invalid TTL");
return -1;
}
if ( (class = record_class_from_str(parts[2])) == 0 ) {
LOGPRINTF(_LOG_ERROR, "Invalid class %s", parts[2]);
return -1;
}
if ( (type = record_type_from_str(parts[3])) == 0 ) {
LOGPRINTF(_LOG_ERROR, "Invalid record type %s", parts[3]);
return -1;
}
if ( (data_len = record_rdata_from_str(&data, parts[4], type)) <= 0 ) {
LOGPRINTF(_LOG_ERROR, "Invalid rdata %s", parts[4]);
return -1;
}
db_entry = malloc((unsigned)data_len + 6);
if ( !db_entry )
goto err;
memset(db_entry, 0, (unsigned)data_len + 6);
DEBUG("Found %s record at %s", parts[3], parts[0]);
*((uint32_t*)db_entry) = ttl;
*((uint16_t*)(db_entry+4)) = (uint16_t) data_len;
strncpy(db_entry+6, data, (unsigned)data_len);
/* This breaks abstraction boundries! */
if ( tree_insert( &_database->zone[class-1][type-1], qname, db_entry ) ) {
LOGPRINTF(_LOG_ERROR, "Failed to insert in database. Does this record already exist?");
free(db_entry);
goto err;
}
free(data);
return 0;
err:
free(data);
return -1;
}
/* TODO convert to creating lists of data to insert efficiently */
int zonefile_to_database (database_t *_database, char* _file) {
FILE *zfile = NULL;
char *line = NULL;
size_t llen = 0;
ssize_t line_len = 0;
unsigned int line_cnt = 0;
zfile = fopen(_file, "r");
if (!zfile) {
LOGPRINTF(_LOG_ERRNO, "Could not open %s", _file);
return -1;
}
DEBUG("Parsing zonefile %s", _file);
/* TODO Make resilient to evil empty lines */
while( (line_len = getline(&line, &llen, zfile)) >= 0 ) {
line_cnt ++;
DEBUG("line %u, length %li, allocated %lu", line_cnt, line_len, llen);
/* getline includes the line break. ONLY UNIX ENDINGS!! */
if( line[line_len - 1] == '\n' )
line[line_len - 1] = '\0';
if ( zonefile_parse_line(_database, line) < 0) {
LOGPRINTF(_LOG_ERROR, "Error is in line %u", line_cnt)
return -1;
}
free(line);
line = NULL;
}
fclose(zfile);
return 0;
}
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