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#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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