diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt index 9bd804a..8b2fdc6 100755 --- a/src/CMakeLists.txt +++ b/src/CMakeLists.txt @@ -1,12 +1,29 @@ cmake_minimum_required(VERSION 2.6) PROJECT(dawn) +INCLUDE_DIRECTORIES(include) + ADD_DEFINITIONS(-Os -Wall -Werror --std=gnu99 -Wmissing-declarations -Wno-unknown-warning-option -Wno-format-truncation) SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "") SET(SOURCES - main.c datastorage.c datastorage.h networksocket.c networksocket.h ubus.c ubus.h utils.h runopts.c runopts.h) + main.c + + storage/datastorage.c + include/datastorage.h + + network/networksocket.c + include/networksocket.h + + utils/ubus.c + include/ubus.h + + include/utils.h + + utils/runopts.c + include/runopts.h + ) SET(LIBS ubox ubus json-c blobmsg_json config) diff --git a/src/include/broadcastsocket.h b/src/include/broadcastsocket.h new file mode 100644 index 0000000..07228e3 --- /dev/null +++ b/src/include/broadcastsocket.h @@ -0,0 +1,12 @@ +#ifndef __DAWN_BROADCASTSOCKET_H +#define __DAWN_BROADCASTSOCKET_H + +#include "ubus.h" + +int init_socket_runopts(char *broadcast_ip, char *broadcast_port); +int init_socket_conffile(); +int init_socket(const char *_broadcastIP, unsigned short _broadcastPort); +int send_string(char *msg); +void close_socket(); + +#endif diff --git a/src/include/datastorage.h b/src/include/datastorage.h new file mode 100644 index 0000000..982b020 --- /dev/null +++ b/src/include/datastorage.h @@ -0,0 +1,48 @@ +#ifndef __DAWN_DATASTORAGE_H +#define __DAWN_DATASTORAGE_H + +#include +#include +#include +#include +#include +#include +#include + +#ifndef ETH_ALEN +#define ETH_ALEN 6 +#endif + +#define SORT_NUM 5 +#define TIME_THRESHOLD 60 // every minute + +// Probe entrys +typedef struct { + uint8_t bssid_addr[ETH_ALEN]; + uint8_t client_addr[ETH_ALEN]; + uint8_t target_addr[ETH_ALEN]; + uint32_t signal; + uint32_t freq; + time_t time; + int counter; +} probe_entry; + +// List +typedef struct node { + probe_entry data; + struct node *ptr; +} node; + +node *insert(node *head, probe_entry entry); +void free_list(node *head); +void print_list(); +void insert_to_list(probe_entry entry, int inc_counter); +int mac_first_in_probe_list(uint8_t bssid_addr[], uint8_t client_addr[]); + +void *remove_thread(void *arg); + +pthread_mutex_t list_mutex; +node *probe_list_head; +char sort_string[SORT_NUM]; + +#endif \ No newline at end of file diff --git a/src/include/runopts.h b/src/include/runopts.h new file mode 100644 index 0000000..421b272 --- /dev/null +++ b/src/include/runopts.h @@ -0,0 +1,4 @@ +#ifndef __DAWN_RUNOPTS_H_ +#define __DAWN_RUNOPTS_H_ + +#endif diff --git a/src/include/ubus.h b/src/include/ubus.h new file mode 100644 index 0000000..9a5ec03 --- /dev/null +++ b/src/include/ubus.h @@ -0,0 +1,11 @@ +#ifndef __DAWN_UBUS_H +#define __DAWN_UBUS_H + +#include "datastorage.h" + +#define MIN_PROBE_REQ 2 // TODO: Parse from config file... + +int dawn_init_ubus(const char *ubus_socket, char *hostapd_dir); +int parse_to_probe_req(struct blob_attr *msg, probe_entry *prob_req); + +#endif diff --git a/src/include/utils.h b/src/include/utils.h new file mode 100644 index 0000000..0b38086 --- /dev/null +++ b/src/include/utils.h @@ -0,0 +1,30 @@ +#ifndef __DAWN_UTILS_H +#define __DAWN_UTILS_H + +#define MAC2STR(a) (a)[0], (a)[1], (a)[2], (a)[3], (a)[4], (a)[5] + +static int hex_to_bin(char ch) { + if ((ch >= '0') && (ch <= '9')) return ch - '0'; + ch = tolower(ch); + if ((ch >= 'a') && (ch <= 'f')) return ch - 'a' + 10; + return -1; +} + +static int hwaddr_aton(const char *txt, uint8_t *addr) { + int i; + + for (i = 0; i < ETH_ALEN; i++) { + int a, b; + + a = hex_to_bin(*txt++); + if (a < 0) return -1; + b = hex_to_bin(*txt++); + if (b < 0) return -1; + *addr++ = (a << 4) | b; + if (i < 5 && *txt++ != ':') return -1; + } + + return 0; +} + +#endif \ No newline at end of file diff --git a/src/network/broadcastsocket.c b/src/network/broadcastsocket.c new file mode 100644 index 0000000..151744b --- /dev/null +++ b/src/network/broadcastsocket.c @@ -0,0 +1,154 @@ +#include +#include +#include +#include +#include +#include + +#include + +#include + +#include "datastorage.h" +#include "broadcastsocket.h" +#include "ubus.h" + +/* Network Defines */ +#define MAX_RECV_STRING 255 +#define NET_CONFIG_PATH "/etc/wlancontroller/networkconfig.conf" + +/* Network Attributes */ +int sock; +struct sockaddr_in broadcast_addr; +const char *broadcast_ip; +unsigned short broadcast_port; +int broadcast_permission; +char recv_string[MAX_RECV_STRING + 1]; +int recv_stringLen; +void *receive_msg(void *args); + +int init_socket_runopts(char *_broadcast_ip, char *_broadcast_port) { + int tmp_broacast_port = atoi(_broadcast_port); + init_socket(_broadcast_ip, tmp_broacast_port); + + pthread_t sniffer_thread; + if (pthread_create(&sniffer_thread, NULL, receive_msg, NULL)) { + fprintf(stderr, "Could not create receiving thread!"); + return -1; + } + + fprintf(stdout, "Connected to %s:%d\n", _broadcast_ip, tmp_broacast_port); + + return 0; +} + +int init_socket_conffile() { + const char *_broadcast_ip; + int _broacast_port; + + config_t cfg; + // config_setting_t *setting; + const char *config_file_name = NET_CONFIG_PATH; + + config_init(&cfg); + + /* Read the file. If there is an error, report it and exit. */ + if (!config_read_file(&cfg, config_file_name)) { + fprintf(stderr, "%s:%d - %s\n", config_error_file(&cfg), + config_error_line(&cfg), config_error_text(&cfg)); + config_destroy(&cfg); + return (EXIT_FAILURE); + } + + if (config_lookup_string(&cfg, "broadcast_ip", &_broadcast_ip)) + printf("Broadcast IP: %s\n", _broadcast_ip); + else + fprintf(stderr, "No 'name' setting in configuration file.\n"); + + if (config_lookup_int(&cfg, "broacast_port", &_broacast_port)) + printf("Broadcast Port: %d\n\n", _broacast_port); + else + fprintf(stderr, "No 'name' setting in configuration file.\n"); + + init_socket(_broadcast_ip, _broacast_port); + + config_destroy(&cfg); + + pthread_t sniffer_thread; + if (pthread_create(&sniffer_thread, NULL, receive_msg, NULL)) { + fprintf(stderr, "Could not create receiving thread!"); + return -1; + } + return 0; +} + +void *receive_msg(void *args) { + while (1) { + if ((recv_stringLen = + recvfrom(sock, recv_string, MAX_RECV_STRING, 0, NULL, 0)) < 0) { + fprintf(stderr, "Could not receive message!"); + continue; + } + + printf("[WC] Network-Received: %s\n", recv_string); + + probe_entry prob_req; + struct blob_buf b; + + blob_buf_init(&b, 0); + blobmsg_add_json_from_string(&b, recv_string); + + recv_string[recv_stringLen] = '\0'; + char *str; + str = blobmsg_format_json(b.head, true); + printf("Parsed: '%s'\n", str); + parse_to_probe_req(b.head, &prob_req); + + // insert to list + insert_to_list(prob_req, 0); + } +} + +int init_socket(const char *_broadcast_ip, unsigned short _broadcast_port) { + broadcast_ip = _broadcast_ip; + broadcast_port = _broadcast_port; + + /* Create socket */ + if ((sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { + fprintf(stderr, "Failed to create socket.\n"); + return -1; + } + + /* Allow broadcast */ + broadcast_permission = 1; + if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (void *)&broadcast_permission, + sizeof(broadcast_permission)) < 0) { + fprintf(stderr, "Failed to create socket.\n"); + return -1; + } + + /* Construct Address */ + memset(&broadcast_addr, 0, sizeof(broadcast_addr)); + broadcast_addr.sin_family = AF_INET; + broadcast_addr.sin_addr.s_addr = inet_addr(broadcast_ip); + broadcast_addr.sin_port = htons(broadcast_port); + + if (bind(sock, (struct sockaddr *)&broadcast_addr, sizeof(broadcast_addr)) < + 0) { + fprintf(stderr, "Binding socket failed!\n"); + return -1; + } + return 0; +} + +int send_string(char *msg) { + int msglen = strlen(msg); + if (sendto(sock, msg, msglen, 0, (struct sockaddr *)&broadcast_addr, + sizeof(broadcast_addr)) != msglen) { + fprintf(stderr, "Failed to send message.\n"); + return -1; + } + return 0; +} + +void close_socket() { close(sock); } diff --git a/src/storage/datastorage.c b/src/storage/datastorage.c new file mode 100644 index 0000000..6760558 --- /dev/null +++ b/src/storage/datastorage.c @@ -0,0 +1,328 @@ +#include "datastorage.h" + +#define MAC2STR(a) (a)[0], (a)[1], (a)[2], (a)[3], (a)[4], (a)[5] + +int go_next_help(char sort_order[], int i, probe_entry entry, + probe_entry next_entry); +int go_next(char sort_order[], int i, probe_entry entry, + probe_entry next_entry); +int mac_is_equal(uint8_t addr1[], uint8_t addr2[]); +int mac_is_greater(uint8_t addr1[], uint8_t addr2[]); +void print_probe_entry(probe_entry entry); +node *delete_probe_req(node **ret_remove, node *head, uint8_t bssid_addr[], + uint8_t client_addr[]); +int mac_is_first_in_list(node *head, uint8_t bssid_addr[], + uint8_t client_addr[]); +node *remove_node(node *head, node *curr, node *prev); +node *remove_old_entries(node *head, time_t current_time, + long long int threshold); +void print_list_with_head(node *head); + +void insert_to_list(probe_entry entry, int inc_counter) { + pthread_mutex_lock(&list_mutex); + + entry.time = time(0); + entry.counter = 0; + + // first delete probe request + // probe_list_head = remove_old_entries(probe_list_head, time(0), + // TIME_THRESHOLD); + node *tmp_probe_req = NULL; + probe_list_head = delete_probe_req(&tmp_probe_req, probe_list_head, + entry.bssid_addr, entry.client_addr); + + if (tmp_probe_req) { + // local ubus + tmp_probe_req->data.signal = entry.signal; + tmp_probe_req->data.time = entry.time; + if (inc_counter) { + // when network don't increase counter... + tmp_probe_req->data.counter++; + } + + // is this correct? + probe_list_head = insert(probe_list_head, tmp_probe_req->data); + free(tmp_probe_req); + } else { + printf("New entry!\n"); + probe_list_head = insert(probe_list_head, entry); + } + + pthread_mutex_unlock(&list_mutex); +} + +int go_next_help(char sort_order[], int i, probe_entry entry, + probe_entry next_entry) { + switch (sort_order[i]) { + // bssid-mac + case 'b': + return mac_is_greater(entry.bssid_addr, next_entry.bssid_addr) && + mac_is_equal(entry.client_addr, next_entry.client_addr); + break; + + // client-mac + case 'c': + return mac_is_greater(entry.client_addr, next_entry.client_addr); + break; + + // frequency + // mac is 5 ghz or 2.4 ghz? + case 'f': + return //entry.freq < next_entry.freq && + entry.freq < 5000 && + next_entry.freq >= 5000 && + //entry.freq < 5 && + mac_is_equal(entry.client_addr, next_entry.client_addr); + break; + + // signal strength (RSSI) + case 's': + return entry.signal < next_entry.signal && + mac_is_equal(entry.client_addr, next_entry.client_addr); + break; + + default: + return 0; + break; + } +} + +int go_next(char sort_order[], int i, probe_entry entry, + probe_entry next_entry) { + int conditions = 1; + for (int j = 0; j < i; j++) { + i &= !(go_next(sort_order, j, entry, next_entry)); + } + return conditions && go_next_help(sort_order, i, entry, next_entry); +} + +node *insert(node *head, probe_entry entry) { + node *temp, *prev, *next; + temp = (node *)malloc(sizeof(node)); + temp->data = entry; + temp->ptr = NULL; + + // length of sorting string + // char sort_string[] = "cfsb"; + int i = 0; + + if (!head) { + head = temp; + } else { + prev = NULL; + next = head; + while (next) { + if (go_next(sort_string, i, entry, next->data)) { + prev = next; + next = next->ptr; + } else if (i < strlen(sort_string)) { + i++; + } else { + break; + } + } + if (!next) { + prev->ptr = temp; + } else { + if (prev) { + temp->ptr = prev->ptr; + prev->ptr = temp; + } else { + temp->ptr = head; + head = temp; + } + } + } + return head; +} + +node *delete_probe_req(node **ret_remove, node *head, uint8_t bssid_addr[], + uint8_t client_addr[]) { + if (!head) { + return head; + } + + if (mac_is_equal(client_addr, head->data.client_addr) && + mac_is_equal(bssid_addr, head->data.bssid_addr)) { + node *temp = head; + head = head->ptr; + *ret_remove = temp; + // don't free pointer + // free(temp); + return head; + } + + node *prev = NULL; + node *next = head; + while (next) { + if (mac_is_greater(next->data.client_addr, client_addr)) { + break; + } + + if (mac_is_equal(client_addr, next->data.client_addr) && + mac_is_equal(bssid_addr, next->data.bssid_addr)) { + node *temp = next; + prev->ptr = next->ptr; + // free(temp); + *ret_remove = temp; + return head; + } + prev = next; + next = next->ptr; + } + return head; +} + +void *remove_thread(void *arg) { + while (1) { + sleep(TIME_THRESHOLD); + pthread_mutex_lock(&list_mutex); + printf("[Thread] : Removing old entries!\n"); + probe_list_head = + remove_old_entries(probe_list_head, time(0), TIME_THRESHOLD); + pthread_mutex_unlock(&list_mutex); + // print_list(); + } + return 0; +} + +node *remove_old_entries(node *head, time_t current_time, + long long int threshold) { + if (head) { + node *prev = NULL; + node *next = head; + while (next) { + if (next->data.time < current_time - threshold) { + head = remove_node(head, next, prev); + // print_list_with_head(head); + if (prev == NULL) // removed head + { + next = head; + } else { + next = prev->ptr; + } + } else { + prev = next; + next = next->ptr; + } + } + } + return head; +} + +// return headpointer +node *remove_node(node *head, node *curr, node *prev) { + if (curr == head) { + node *temp = head; + head = head->ptr; + free(temp); + } else { + node *temp = curr; + prev->ptr = curr->ptr; + free(temp); + } + // printf("Removed old entry!\n"); + return head; +} + +int mac_is_first_in_list(node *head, uint8_t bssid_addr[], + uint8_t client_addr[]) { + if (!head) { + return 1; + } + node *next = head; + while (next) { + if (mac_is_greater(next->data.client_addr, client_addr)) { + break; + } + + if (mac_is_equal(client_addr, next->data.client_addr)) { + print_probe_entry(next->data); + return mac_is_equal(bssid_addr, next->data.bssid_addr); + } + next = next->ptr; + } + return 0; +} + +int mac_first_in_probe_list(uint8_t bssid_addr[], uint8_t client_addr[]) { + pthread_mutex_lock(&list_mutex); + int ret = mac_is_first_in_list(probe_list_head, bssid_addr, client_addr); + pthread_mutex_unlock(&list_mutex); + return ret; +} + +void free_list(node *head) { + node *prev = head; + node *cur = head; + while (cur) { + prev = cur; + cur = prev->ptr; + free(prev); + } +} + +int mac_is_equal(uint8_t addr1[], uint8_t addr2[]) { + return memcmp(addr1, addr2, ETH_ALEN * sizeof(uint8_t)) == 0; +} + +int mac_is_greater(uint8_t addr1[], uint8_t addr2[]) { + for (int i = 0; i < ETH_ALEN; i++) { + if (addr1[i] > addr2[i]) { + return 1; + } + if (addr1[i] < addr2[i]) { + return 0; + } + + // if equal continue... + } + return 0; +} + +void print_list_with_head(node *head) { + pthread_mutex_lock(&list_mutex); + printf("------------------\n"); + if (head) { + node *next; + next = head; + while (next) { + print_probe_entry(next->data); + next = next->ptr; + } + } + printf("------------------\n"); + pthread_mutex_unlock(&list_mutex); +} + +void print_list() { + pthread_mutex_lock(&list_mutex); + printf("------------------\n"); + node *head = probe_list_head; + if (head) { + node *next; + next = head; + while (next) { + print_probe_entry(next->data); + next = next->ptr; + } + } + printf("------------------\n"); + pthread_mutex_unlock(&list_mutex); +} + +void print_probe_entry(probe_entry entry) { + char mac_buf_ap[20]; + char mac_buf_client[20]; + char mac_buf_target[20]; + + sprintf(mac_buf_ap, "%x:%x:%x:%x:%x:%x", MAC2STR(entry.bssid_addr)); + sprintf(mac_buf_client, "%x:%x:%x:%x:%x:%x", MAC2STR(entry.client_addr)); + sprintf(mac_buf_target, "%x:%x:%x:%x:%x:%x", MAC2STR(entry.target_addr)); + + printf( + "bssid_addr: %s, client_addr: %s, target_addr: %s, signal: %d, freq: " + "%d, counter: %d\n", + mac_buf_ap, mac_buf_client, mac_buf_target, entry.signal, entry.freq, + entry.counter); +} \ No newline at end of file diff --git a/src/utils/runopts.c b/src/utils/runopts.c new file mode 100644 index 0000000..a582f6d --- /dev/null +++ b/src/utils/runopts.c @@ -0,0 +1 @@ +#include "runopts.h" diff --git a/src/utils/ubus.c b/src/utils/ubus.c new file mode 100644 index 0000000..ddc2e6d --- /dev/null +++ b/src/utils/ubus.c @@ -0,0 +1,181 @@ +#include +#include +#include +#include +#include + +#ifndef ETH_ALEN +#define ETH_ALEN 6 +#endif + +#include "networksocket.h" +#include "ubus.h" +#include "utils.h" + +static struct ubus_context *ctx; +static struct ubus_subscriber hostapd_event; + +enum { + PROB_BSSID_ADDR, + PROB_CLIENT_ADDR, + PROB_TARGET_ADDR, + PROB_SIGNAL, + PROB_FREQ, + __PROB_MAX, +}; + +static const struct blobmsg_policy prob_policy[__PROB_MAX] = { + [PROB_BSSID_ADDR] = {.name = "bssid", .type = BLOBMSG_TYPE_STRING}, + [PROB_CLIENT_ADDR] = {.name = "address", .type = BLOBMSG_TYPE_STRING}, + [PROB_TARGET_ADDR] = {.name = "target", .type = BLOBMSG_TYPE_STRING}, + [PROB_SIGNAL] = {.name = "signal", .type = BLOBMSG_TYPE_INT32}, + [PROB_FREQ] = {.name = "freq", .type = BLOBMSG_TYPE_INT32}, +}; + +/* Function Definitions */ +static void hostapd_handle_remove(struct ubus_context *ctx, + struct ubus_subscriber *s, uint32_t id); +static int hostapd_notify(struct ubus_context *ctx, struct ubus_object *obj, + struct ubus_request_data *req, const char *method, + struct blob_attr *msg); +static int add_subscriber(char *name); +int parse_to_probe_req(struct blob_attr *msg, probe_entry *prob_req); +static int subscribe_to_hostapd_interfaces(char *hostapd_dir); + +static int decide_function(probe_entry *prob_req) { + // TODO: Refactor... + if (prob_req->counter < MIN_PROBE_REQ) { + return 0; + } + + int ret = + mac_first_in_probe_list(prob_req->bssid_addr, prob_req->client_addr); + if (ret) { + printf("Mac will be accepted!\n"); + } else { + printf("Mac will be declined!\n"); + } + return ret; +} + +static void hostapd_handle_remove(struct ubus_context *ctx, + struct ubus_subscriber *s, uint32_t id) { + fprintf(stderr, "Object %08x went away\n", id); +} + +int parse_to_probe_req(struct blob_attr *msg, probe_entry *prob_req) { + struct blob_attr *tb[__PROB_MAX]; + blobmsg_parse(prob_policy, __PROB_MAX, tb, blob_data(msg), blob_len(msg)); + + if (hwaddr_aton(blobmsg_data(tb[PROB_BSSID_ADDR]), prob_req->bssid_addr)) + return UBUS_STATUS_INVALID_ARGUMENT; + + if (hwaddr_aton(blobmsg_data(tb[PROB_CLIENT_ADDR]), prob_req->client_addr)) + return UBUS_STATUS_INVALID_ARGUMENT; + + if (hwaddr_aton(blobmsg_data(tb[PROB_TARGET_ADDR]), prob_req->target_addr)) + return UBUS_STATUS_INVALID_ARGUMENT; + + if (tb[PROB_SIGNAL]) { + prob_req->signal = blobmsg_get_u32(tb[PROB_SIGNAL]); + } + + if (tb[PROB_FREQ]) { + prob_req->freq = blobmsg_get_u32(tb[PROB_FREQ]); + } + return 0; +} + +static int hostapd_notify(struct ubus_context *ctx, struct ubus_object *obj, + struct ubus_request_data *req, const char *method, + struct blob_attr *msg) { + probe_entry prob_req; + parse_to_probe_req(msg, &prob_req); + insert_to_list(prob_req, 1); + + // send probe via network + char *str; + str = blobmsg_format_json(msg, true); + send_string(str); + + printf("[WC] Hostapd-Probe: %s : %s\n", method, str); + + print_list(); + + // sleep(2); // sleep for 2s + + // deny access + if (!decide_function(&prob_req)) { + return UBUS_STATUS_UNKNOWN_ERROR; + } + + // allow access + return 0; +} + +static int add_subscriber(char *name) { + uint32_t id = 0; + + if (ubus_lookup_id(ctx, name, &id)) { + fprintf(stderr, "Failed to look up test object for %s\n", name); + return -1; + } + + // add callbacks + hostapd_event.remove_cb = hostapd_handle_remove; + hostapd_event.cb = hostapd_notify; + + int ret = ubus_subscribe(ctx, &hostapd_event, id); + + fprintf(stderr, "Watching object %08x: %s\n", id, ubus_strerror(ret)); + + return 0; +} + +static int subscribe_to_hostapd_interfaces(char *hostapd_dir) { + DIR *dirp; + struct dirent *entry; + + int ret = ubus_register_subscriber(ctx, &hostapd_event); + if (ret) { + fprintf(stderr, "Failed to add watch handler: %s\n", ubus_strerror(ret)); + return -1; + } + + dirp = opendir(hostapd_dir); // error handling? + while ((entry = readdir(dirp)) != NULL) { + if (entry->d_type == DT_SOCK) { + char subscribe_name[256]; + sprintf(subscribe_name, "hostapd.%s", entry->d_name); + printf("Subscribing to %s\n", subscribe_name); + add_subscriber(subscribe_name); + } + } + // free(hostapd_dir); // free string + return 0; +} + +int dawn_init_ubus(const char *ubus_socket, char *hostapd_dir) { + uloop_init(); + signal(SIGPIPE, SIG_IGN); + + ctx = ubus_connect(ubus_socket); + if (!ctx) { + fprintf(stderr, "Failed to connect to ubus\n"); + return -1; + } else { + printf("Connected to ubus\n"); + } + + ubus_add_uloop(ctx); + + subscribe_to_hostapd_interfaces(hostapd_dir); + + uloop_run(); + + close_socket(); + + ubus_free(ctx); + uloop_done(); + return 0; +} \ No newline at end of file