/*
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* execution_environment.cpp
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*
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* Created on: Dec 15, 2019
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* Author: GC
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*/
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#define __STDC_WANT_LIB_EXT1__1
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#include <paths.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fstream>
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#include <iostream>
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#include <stdio.h>
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#include <string.h>
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#include <dirent.h>
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#include <sys/utsname.h>
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#include "../../base/base.h"
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#include "../cpu_info.hpp"
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#include "../execution_environment.hpp"
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#include "../../base/file_utils.hpp"
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#include "../../base/string_utils.h"
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namespace license {
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namespace os {
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using namespace std;
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// 0=NO 1=Docker/2=Lxc
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static CONTAINER_TYPE checkContainerProc() {
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// in docer /proc/self/cgroups contains the "docker" or "lxc" string
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// https://stackoverflow.com/questions/23513045/how-to-check-if-a-process-is-running-inside-docker-container
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char path[MAX_PATH] = {0};
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char proc_path[MAX_PATH], pidStr[64];
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pid_t pid = getpid();
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snprintf(pidStr, sizeof(pidStr), "%d", pid);
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strncpy(proc_path, "/proc/", sizeof(proc_path));
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strncat(proc_path, pidStr, sizeof(proc_path));
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strncpy(proc_path, "/cgroup", sizeof(proc_path));
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FILE *fp;
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char *line = NULL;
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size_t len = 0;
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ssize_t read;
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CONTAINER_TYPE result = CONTAINER_TYPE::NONE;
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fp = fopen(proc_path, "r");
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if (fp == NULL) {
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return CONTAINER_TYPE::NONE;
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}
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while ((read = getline(&line, &len, fp)) != -1 && result == 0) {
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if (strstr(line, "docker") != NULL) {
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result = CONTAINER_TYPE::DOCKER;
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}
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if (strstr(line, "lxc") != NULL) {
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result = CONTAINER_TYPE::LXC;
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}
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}
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fclose(fp);
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if (line) free(line);
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return result;
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}
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// 0=NO 1=Docker/2=Lxc
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static CONTAINER_TYPE checkSystemdContainer() {
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ifstream systemd_container("/var/run/systemd/container");
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CONTAINER_TYPE result = CONTAINER_TYPE::NONE;
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if (systemd_container.good()) {
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result = CONTAINER_TYPE::DOCKER;
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for (string line; getline(systemd_container, line);) {
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if (line.find("docker") != string::npos) {
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result = CONTAINER_TYPE::DOCKER;
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break;
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} else if (line.find("lxc") != string::npos) {
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result = CONTAINER_TYPE::LXC;
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break;
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}
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}
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}
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return result;
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}
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static CONTAINER_TYPE get_container_type() {
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CONTAINER_TYPE result = checkContainerProc();
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if (result == CONTAINER_TYPE::NONE) {
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result = checkSystemdContainer();
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}
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return result;
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}
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ExecutionEnvironment::ExecutionEnvironment() : m_container_type(get_container_type()) {}
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} // namespace os
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} // namespace license
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