From 1fa9b6e34e5c92aa7fe492417cda2d21ec067ff8 Mon Sep 17 00:00:00 2001
From: arf20 <aruizfernandez05@gmail.com>
Date: Tue, 28 Oct 2025 13:45:38 +0100
Subject: unified config, refactor, for alerts

---
 check.c | 135 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 check.c

(limited to 'check.c')

diff --git a/check.c b/check.c
new file mode 100644
index 0000000..2bd599d
--- /dev/null
+++ b/check.c
@@ -0,0 +1,135 @@
+#include "check.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#include <curl/curl.h>
+
+static int
+check_reach(const char *target)
+{
+    static char ping_cmd[256];
+    
+    snprintf(ping_cmd, 256, "ping -W1 -c1 %s > /dev/null", target);
+    /* i know */
+    if (system(ping_cmd) == 0) {
+        printf("reachable\n");
+        return STATUS_UP;
+    } else {
+        printf("unreachable\n");
+        return STATUS_DOWN;
+    }
+}
+
+static int
+check_dns(const char *name)
+{
+    static char dig_cmd[512];
+    static char cmd_out[256];
+
+    snprintf(dig_cmd, 512, "dig +nocookie +short %s NS", name);
+    FILE *pf = popen(dig_cmd, "r");
+    fread(cmd_out, 256, 1, pf);
+    pclose(pf);
+
+    if (*cmd_out == '\0') {
+        printf("no ns\n");
+        return STATUS_DOWN;
+    }
+    
+    *strchr(cmd_out, '\n') = '\0';
+
+    snprintf(dig_cmd, 512, "dig +nocookie +short @%s %s A", cmd_out, name);
+    pf = popen(dig_cmd, "r");
+    fread(cmd_out, 256, 1, pf);
+    pclose(pf);
+    
+    if (*cmd_out == '\0' || !isdigit(*cmd_out)) {
+        printf("no a: %s\n", cmd_out);
+        return STATUS_DOWN;
+    }
+    
+    *strchr(cmd_out, '\n') = '\0';
+
+    printf("%s\n", cmd_out);
+
+    return STATUS_UP;
+}
+
+static size_t
+write_data(void *ptr, size_t size, size_t nmemb, void *stream)
+{
+    return size * nmemb;
+}
+
+static int
+check_http(const char *endpoint)
+{
+    CURL *curl = curl_easy_init();
+    if (!curl) {
+        fprintf(stderr, "Error allocating cURL handle\n");
+        return -1;
+    }
+
+    //curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1L);
+    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
+    curl_easy_setopt(curl, CURLOPT_TIMEOUT, 1);
+
+    curl_easy_setopt(curl, CURLOPT_URL, endpoint);
+    CURLcode curl_code = curl_easy_perform(curl);
+    if (curl_code != CURLE_OK) {
+        printf("curl_easy_perform() failed: %s\n",
+            curl_easy_strerror(curl_code));
+        return STATUS_DOWN;
+    }
+
+    long http_code;
+    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_code);
+
+    curl_easy_cleanup(curl);
+
+    printf("%ld\n", http_code);
+
+    return http_code == 200 ? STATUS_UP : STATUS_DOWN;
+}
+
+void
+check_perform(target_t *targets, size_t targets_n)
+{
+    static size_t check_num = 0;
+    static char timestr[256];
+
+    time_t time_now = time(NULL);
+    struct tm *tm_now = gmtime(&time_now);
+    strftime(timestr, 256, "%F %T", tm_now);
+
+    static const int (*check_funcs[])(const char *) = {
+        check_reach,
+        check_dns,
+        check_http
+    };
+
+    for (size_t i = 0; i < targets_n; i++) {
+        printf("[%s] [monitor] check #%ld %s: ",
+            timestr, check_num, targets[i].name);
+        targets[i].status = check_funcs[targets[i].type](targets[i].target);
+    }
+
+    check_num++;
+}
+
+int
+check_init()
+{
+    CURLcode res = curl_global_init(CURL_GLOBAL_ALL);
+    if (res) {
+        fprintf(stderr, "Error initializing cURL: %s\n",
+            curl_easy_strerror(res));
+        return -1;
+    }
+
+    return 0;
+}
+
+
-- 
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