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#include <sys/types.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <microhttpd.h>
#include "monitor.h"
#define PORT 8888
#define RES_BUFF 65535
static char *index_format_template = NULL;
enum MHD_Result answer_to_connection(
void *cls, struct MHD_Connection *connection,
const char *url,
const char *method,
const char *version,
const char *upload_data,
size_t *upload_data_size,
void **ptr
) {
char buff[RES_BUFF];
const struct sockaddr_in **coninfo =
(const struct sockaddr_in**)MHD_get_connection_info(
connection, MHD_CONNECTION_INFO_CLIENT_ADDRESS);
time_t time_now = time(NULL);
struct tm *tm_now = gmtime(&time_now);
static char timestr[256];
strftime(timestr, 256, "%Y-%m-%d %H-%M-%S", tm_now);
printf("[%s] [webserver] %s %s %s: ",
timestr, inet_ntoa((*coninfo)->sin_addr), method, url);
struct MHD_Response *response;
int ret;
if (strcmp(method, "GET") == 0 && strcmp(url, "/") == 0) {
snprintf(buff, RES_BUFF,
index_format_template, monitor_generate_status_html());
response = MHD_create_response_from_buffer(strlen(buff), (void*)buff,
MHD_RESPMEM_PERSISTENT);
printf("%d\n", 200);
ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
MHD_destroy_response(response);
}
else {
response = MHD_create_response_from_buffer(0, (void*)NULL, 0);
printf("%d\n", 418);
ret = MHD_queue_response(connection, 418, response);
MHD_destroy_response(response);
}
return ret;
}
int main() {
/* read index template file */
FILE *tf = fopen("index.htm.tmpl", "r");
if (!tf) {
fprintf(stderr, "error opening index template file: %s\n",
strerror(errno));
return 1;
}
fseek(tf, 0, SEEK_END);
size_t tfs = ftell(tf);
rewind(tf);
index_format_template = malloc(tfs);
fread(index_format_template, 1, tfs, tf);
fclose(tf);
/* start server */
struct MHD_Daemon *daemon;
daemon = MHD_start_daemon(
MHD_USE_INTERNAL_POLLING_THREAD | MHD_USE_EPOLL,
PORT, NULL, NULL,
&answer_to_connection, NULL, MHD_OPTION_END);
if (!daemon) {
fprintf(stderr, "error starting libmicrohttpd daemon: \n");
return 1;
}
monitor_init("monitor.cfg");
while (1) {
monitor_check();
sleep(5);
}
}
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