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Rework event handling

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This commit is contained in:
Davidson Francis 2024-05-30 22:28:28 -03:00
parent 18efb5f77e
commit 1536d63f12
6 changed files with 182 additions and 130 deletions
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2
.gitignore vendored
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@ -1,5 +1,5 @@
alertik
alertik.o
*.o
toolchain/armv6-linux-musleabi-cross
toolchain/BearSSL
toolchain/curl-8.8.0

4
Makefile
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@ -32,7 +32,7 @@ CFLAGS += -DGIT_HASH=\"$(GIT_HASH)\"
all: alertik Makefile
$(STRIP) --strip-all alertik
alertik: alertik.o
alertik: alertik.o events.o
clean:
rm -f alertik.o alertik
rm -f alertik.o events.o alertik

151
alertik.c
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@ -3,8 +3,6 @@
* This is free and unencumbered software released into the public domain.
*/
#define ALERTIK_VERSION "0.1"
#define _POSIX_C_SOURCE 200809L
#include <errno.h>
#include <fcntl.h>
@ -23,8 +21,8 @@
#include <curl/curl.h>
#define SYSLOG_PORT 5140
#define LOG_FILE "log/log.txt"
#include "alertik.h"
#include "events.h"
/* Uncomment/comment to enable/disable the following settings. */
// #define USE_FILE_AS_LOG /* stdout if commented. */
@ -32,38 +30,19 @@
// #define VALIDATE_CERTS
// #define DISABLE_NOTIFICATIONS
#define panic_errno(s) \
do {\
log_msg("%s: %s", (s), strerror(errno)); \
exit(EXIT_FAILURE); \
} while(0);
#define panic(...) \
do {\
log_msg(__VA_ARGS__); \
exit(EXIT_FAILURE); \
} while(0);
#define MIN(a,b) (((a)<(b))?(a):(b))
#define MSG_MAX 2048
#define FIFO_MAX 64
#define SYSLOG_PORT 5140
#define LOG_FILE "log/log.txt"
/* Telegram & request settings. */
static char *TELEGRAM_BOT_TOKEN;
static char *TELEGRAM_CHAT_ID;
static char *TELEGRAM_NICKNAME;
char *TELEGRAM_NICKNAME;
#define CURL_USER_AGENT "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 " \
"(KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36"
/* Circular message buffer. */
struct log_event {
char msg[MSG_MAX];
time_t timestamp;
};
static struct circ_buffer {
int head;
int tail;
@ -82,17 +61,6 @@ static int curr_file;
//////////////////////////////// LOGGING //////////////////////////////////////
static inline char *get_formatted_time(time_t time, char *time_str)
{
strftime(
time_str,
32,
"%Y-%m-%d %H:%M:%S",
localtime(&time)
);
return time_str;
}
/* There should *always* be a corresponding close_log_file() call. */
static inline void open_log_file(void)
{
@ -125,7 +93,18 @@ out:
pthread_mutex_unlock(&log_mutex);
}
static inline void log_msg(const char *fmt, ...)
char *get_formatted_time(time_t time, char *time_str)
{
strftime(
time_str,
32,
"%Y-%m-%d %H:%M:%S",
localtime(&time)
);
return time_str;
}
void log_msg(const char *fmt, ...)
{
char time_str[32] = {0};
va_list ap;
@ -257,7 +236,7 @@ size_t libcurl_noop_cb(void *ptr, size_t size, size_t nmemb, void *data) {
return size * nmemb;
}
static int send_telegram_notification(const char *msg)
int send_telegram_notification(const char *msg)
{
char full_request_url[4096] = {0};
char *escaped_msg = NULL;
@ -318,111 +297,31 @@ error:
return ret;
}
///////////////////////////// FAILED LOGIN ATTEMPTS
static int
parse_login_attempt_msg(const char *msg, char *wifi_iface, char *mac_addr)
{
size_t len = strlen(msg);
size_t tmp = 0;
size_t at = 0;
/* Find '@' and the last ' '. */
for (at = 0; at < len && msg[at] != '@'; at++) {
if (msg[at] == ' ')
tmp = at;
}
if (at == len || !tmp) {
log_msg("unable to additional data, ignoring...\n");
return -1;
}
memcpy(mac_addr, msg + tmp + 1, MIN(at - tmp - 1, 32));
/*
* Find network name.
* Assuming that the interface name does not have ':'...
*/
for (tmp = at + 1; tmp < len && msg[tmp] != ':'; tmp++);
if (tmp == len) {
log_msg("unable to find interface name!, ignoring..\n");
return -1;
}
memcpy(wifi_iface, msg + at + 1, MIN(tmp - at - 1, 32));
return (0);
}
static void handle_wifi_login_attempts(struct log_event *ev)
{
char time_str[32] = {0};
char mac_addr[32] = {0};
char wifi_iface[32] = {0};
char notification_message[2048] = {0};
log_msg("> Login attempt detected!\n");
if ((time(NULL) - time_last_sent_notify) <= LAST_SENT_THRESHOLD_SECS) {
log_msg("ignoring, reason: too many notifications!\n");
return;
}
if (parse_login_attempt_msg(ev->msg, wifi_iface, mac_addr) < 0)
return;
/* Send our notification. */
snprintf(
notification_message,
sizeof notification_message - 1,
"%s! %s!, there is someone trying to connect "
"to your WiFi: %s, with the mac-address: %s, at:%s",
TELEGRAM_NICKNAME, TELEGRAM_NICKNAME,
wifi_iface,
mac_addr,
get_formatted_time(ev->timestamp, time_str)
);
log_msg("> Retrieved info, MAC: (%s), Interface: (%s)\n", mac_addr, wifi_iface);
if (send_telegram_notification(notification_message) < 0) {
log_msg("unable to send the notification!\n");
return;
}
}
/* Handlers. */
static struct ev_handlers {
const char *str;
void(*hnd)(struct log_event *);
} handlers[] = {
{"unicast key exchange timeout", handle_wifi_login_attempts},
/* Add new handlers here. */
};
static void *handle_messages(void *p)
{
((void)p);
size_t i;
size_t num_handlers;
struct log_event ev = {0};
num_handlers = sizeof(handlers)/sizeof(handlers[0]);
while (pop_msg_from_fifo(&ev) >= 0) {
print_log_event(&ev);
if ((time(NULL) - time_last_sent_notify) <= LAST_SENT_THRESHOLD_SECS) {
log_msg("ignoring, reason: too many notifications!\n");
continue;
}
/* Check if it belongs to any of our desired events. */
for (i = 0; i < num_handlers; i++) {
for (i = 0; i < NUM_EVENTS; i++) {
if (strstr(ev.msg, handlers[i].str)) {
handlers[i].hnd(&ev);
break;
}
}
if (i == num_handlers)
if (i == NUM_EVENTS)
log_msg("> No match!\n");
}
return NULL;
}

31
alertik.h Normal file
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@ -0,0 +1,31 @@
/*
* Alertik: a tiny 'syslog' server & notification tool for Mikrotik routers.
* This is free and unencumbered software released into the public domain.
*/
#ifndef ALERTIK_H
#define ALERTIK_H
#include <stdarg.h>
#include <stdlib.h>
#define panic_errno(s) \
do {\
log_msg("%s: %s", (s), strerror(errno)); \
exit(EXIT_FAILURE); \
} while(0);
#define panic(...) \
do {\
log_msg(__VA_ARGS__); \
exit(EXIT_FAILURE); \
} while(0);
#define MIN(a,b) (((a)<(b))?(a):(b))
extern char *TELEGRAM_NICKNAME;
extern char *get_formatted_time(time_t time, char *time_str);
extern void log_msg(const char *fmt, ...);
extern int send_telegram_notification(const char *msg);
#endif /* ALERTIK_H */

91
events.c Normal file
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@ -0,0 +1,91 @@
/*
* Alertik: a tiny 'syslog' server & notification tool for Mikrotik routers.
* This is free and unencumbered software released into the public domain.
*/
#include <stdio.h>
#include <string.h>
#include "events.h"
#include "alertik.h"
void handle_wifi_login_attempts(struct log_event *ev);
/* Handlers. */
struct ev_handler handlers[NUM_EVENTS] = {
/* Failed login attempts. */
{
.str = "unicast key exchange timeout",
.hnd = handle_wifi_login_attempts,
.evnt_type = EVNT_SUBSTR
},
/* Add new handlers here. */
};
///////////////////////////// FAILED LOGIN ATTEMPTS ///////////////////////////
static int
parse_login_attempt_msg(const char *msg, char *wifi_iface, char *mac_addr)
{
size_t len = strlen(msg);
size_t tmp = 0;
size_t at = 0;
/* Find '@' and the last ' '. */
for (at = 0; at < len && msg[at] != '@'; at++) {
if (msg[at] == ' ')
tmp = at;
}
if (at == len || !tmp) {
log_msg("unable to parse additional data, ignoring...\n");
return -1;
}
memcpy(mac_addr, msg + tmp + 1, MIN(at - tmp - 1, 32));
/*
* Find network name.
* Assuming that the interface name does not have ':'...
*/
for (tmp = at + 1; tmp < len && msg[tmp] != ':'; tmp++);
if (tmp == len) {
log_msg("unable to find interface name!, ignoring..\n");
return -1;
}
memcpy(wifi_iface, msg + at + 1, MIN(tmp - at - 1, 32));
return (0);
}
void handle_wifi_login_attempts(struct log_event *ev)
{
char time_str[32] = {0};
char mac_addr[32] = {0};
char wifi_iface[32] = {0};
char notification_message[2048] = {0};
log_msg("> Login attempt detected!\n");
if (parse_login_attempt_msg(ev->msg, wifi_iface, mac_addr) < 0)
return;
/* Send our notification. */
snprintf(
notification_message,
sizeof notification_message - 1,
"%s! %s!, there is someone trying to connect "
"to your WiFi: %s, with the mac-address: %s, at:%s",
TELEGRAM_NICKNAME, TELEGRAM_NICKNAME,
wifi_iface,
mac_addr,
get_formatted_time(ev->timestamp, time_str)
);
log_msg("> Retrieved info, MAC: (%s), Interface: (%s)\n", mac_addr, wifi_iface);
if (send_telegram_notification(notification_message) < 0) {
log_msg("unable to send the notification!\n");
return;
}
}
////////////////////////////// YOUR HANDLER HERE //////////////////////////////

31
events.h Normal file
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@ -0,0 +1,31 @@
/*
* Alertik: a tiny 'syslog' server & notification tool for Mikrotik routers.
* This is free and unencumbered software released into the public domain.
*/
#ifndef EVENTS_H
#define EVENTS_H
#include <time.h>
#define MSG_MAX 2048
#define NUM_EVENTS 1
#define EVNT_SUBSTR 1
#define EVNT_REGEX 2
/* Log event. */
struct log_event {
char msg[MSG_MAX];
time_t timestamp;
};
struct ev_handler {
const char *str;
void(*hnd)(struct log_event *);
int evnt_type;
};
extern struct ev_handler handlers[NUM_EVENTS];
#endif /* EVENTS_H */