auth.c

#include <stdio.h>
#include <string.h>
#include "mongoose.h"

static int ev_handler(struct mg_connection *conn, enum mg_event ev) {

  if (ev == MG_AUTH) {
    int result = MG_FALSE; // Not authorized
    FILE *fp;

    // To populate passwords file, do
    // mongoose -A my_passwords.txt mydomain.com admin admin
    if ((fp = fopen("my_passwords.txt", "r")) != NULL) {
      result = mg_authorize_digest(conn, fp);
      fclose(fp);
    }

    return result;
  }

  return MG_FALSE;
}

int main(void) {
  struct mg_server *server = mg_create_server(NULL, ev_handler);
  mg_set_option(server, "listening_port", "8080");
  mg_set_option(server, "document_root", ".");

  printf("Starting on port %s\n", mg_get_option(server, "listening_port"));
  for (;;) {
    mg_poll_server(server, 1000);
  }
  mg_destroy_server(&server);

  return 0;
}