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/*
* ndpi_domain_classify.c
*
* Copyright (C) 2011-24 - ntop.org and contributors
*
* nDPI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* nDPI is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdlib.h>
#include <errno.h>
#include <math.h>
#include <sys/types.h>
#include "ndpi_config.h"
#include "ndpi_api.h"
#define ENCODE_DATA
/* ********************************************************** */
ndpi_domain_classify* ndpi_domain_classify_alloc() {
ndpi_domain_classify *s = (ndpi_domain_classify*)ndpi_malloc(sizeof(ndpi_domain_classify));
if(!s)
return NULL;
if(ndpi_hash_init(&s->domains) != 0) {
ndpi_free(s);
return(NULL);
}
return((ndpi_domain_classify*)s);
}
/* ********************************************************** */
void ndpi_domain_classify_free(ndpi_domain_classify *s) {
if(!s)
return;
ndpi_hash_free(&s->domains);
ndpi_free(s);
}
/* ********************************************************** */
u_int32_t ndpi_domain_classify_size(ndpi_domain_classify *s) {
u_int32_t tot_len = sizeof(ndpi_domain_classify);
if(!s)
return(0);
/* TODO */
return(tot_len);
}
/* ********************************************************** */
bool ndpi_domain_classify_add(struct ndpi_detection_module_struct *ndpi_str,
ndpi_domain_classify *s,
u_int16_t class_id,
char *domain) {
#ifdef ENCODE_DATA
u_int32_t out_len;
char out[256];
#endif
if((!s) || (!domain))
return(false);
/* Skip initial string . in domain names */
while(domain[0] == '.') domain++;
//printf("%s\n", domain);
// fprintf(stdout, "."); fflush(stdout);
#ifdef ENCODE_DATA
if(ndpi_str) {
out_len = ndpi_encode_domain(ndpi_str, domain, out, sizeof(out));
ndpi_hash_add_entry(&s->domains, out, out_len, class_id);
} else
ndpi_hash_add_entry(&s->domains, domain, strlen(domain), class_id);
#else
ndpi_hash_add_entry(&s->domains, domain, strlen(domain), class_id);
#endif
return(true);
}
/* ********************************************************** */
u_int32_t ndpi_domain_classify_add_domains(struct ndpi_detection_module_struct *ndpi_mod,
ndpi_domain_classify *s,
u_int16_t class_id,
char *file_path) {
u_int32_t num_added = 0;
char buf[256];
FILE *fd;
char *line;
if((!s) || (!file_path))
return(false);
fd = fopen(file_path, "r");
if(fd == NULL)
return(false);
while((line = fgets(buf, sizeof(buf), fd)) != NULL) {
u_int len;
if((line[0] == '#') || (line[0] == '\0'))
continue;
else {
len = strlen(line) - 1;
if(len == 0)
continue;
else
line[len] = '\0';
}
if(ndpi_domain_classify_add(ndpi_mod, s, class_id, line))
num_added++;
}
fclose(fd);
return(num_added);
}
/* ********************************************************** */
bool ndpi_domain_classify_hostname(struct ndpi_detection_module_struct *ndpi_mod,
ndpi_domain_classify *s,
u_int16_t *class_id /* out */,
char *hostname) {
u_int32_t len;
const char *dot;
char *item;
// ndpi_enable_loaded_categories(ndpi_mod); /* Make sure they have been enabled */
*class_id = 0; /* Unknown class_id */
if(!hostname || !s) return(false);
if((len = strlen(hostname)) == 0) return(false);
if((dot = strrchr(hostname, '.')) == NULL) return(false);
if((!strcmp(dot, ".arpa")) || (!strcmp(dot, ".local"))) return(false);
item = hostname;
while(true) {
char *next;
/* This looks like a match so let's check the hash now */
#ifdef ENCODE_DATA
if(ndpi_mod) {
char out[256];
u_int32_t out_len = ndpi_encode_domain(ndpi_mod, item, out, sizeof(out));
if(ndpi_hash_find_entry(s->domains, out, out_len, class_id) == 0)
return(true);
} else {
if(ndpi_hash_find_entry(s->domains, item, strlen(item), class_id) == 0)
return(true);
}
#else
if(ndpi_hash_find_entry(s->domains, item, strlen(item), class_id) == 0)
return(true);
#endif
next = strchr(item, '.');
if(!next) break; else item = &next[1];
}
/* Not found */
return(false);
}
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