327 lines
7.2 KiB
C
327 lines
7.2 KiB
C
/*
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* Copyright (C) 2007 Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#define _GNU_SOURCE
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <dirent.h>
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#include <errno.h>
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#include <debug.h>
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#include <utils/linked_list.h>
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#include "dumm.h"
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#define PERME (S_IRWXU | S_IRWXG)
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#define GUEST_DIR "guests"
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#define TEMPLATE_DIR "templates"
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#define TEMPLATE_DIR_DIR "diff"
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typedef struct private_dumm_t private_dumm_t;
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struct private_dumm_t {
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/** public dumm interface */
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dumm_t public;
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/** working dir */
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char *dir;
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/** directory of guests */
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char *guest_dir;
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/** directory of templates */
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char *template_dir;
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/** directory of loaded template */
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char *template;
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/** list of managed guests */
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linked_list_t *guests;
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/** list of managed bridges */
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linked_list_t *bridges;
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/** do not catch signals if we are destroying */
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bool destroying;
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};
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/**
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* Implementation of dumm_t.create_guest.
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*/
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static guest_t* create_guest(private_dumm_t *this, char *name, char *kernel,
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char *master, int mem)
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{
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guest_t *guest;
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guest = guest_create(this->guest_dir, name, kernel, master, mem);
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if (guest)
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{
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this->guests->insert_last(this->guests, guest);
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}
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return guest;
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}
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/**
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* Implementation of dumm_t.create_guest_enumerator.
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*/
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static enumerator_t* create_guest_enumerator(private_dumm_t *this)
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{
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return this->guests->create_enumerator(this->guests);
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}
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/**
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* Implementation of dumm_t.delete_guest.
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*/
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static void delete_guest(private_dumm_t *this, guest_t *guest)
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{
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if (this->guests->remove(this->guests, guest, NULL))
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{
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char buf[512];
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int len;
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len = snprintf(buf, sizeof(buf), "rm -Rf %s/%s",
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this->guest_dir, guest->get_name(guest));
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guest->destroy(guest);
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if (len > 8 && len < 512)
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{
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system(buf);
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}
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}
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}
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/**
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* Implementation of dumm_t.create_bridge.
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*/
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static bridge_t* create_bridge(private_dumm_t *this, char *name)
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{
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bridge_t *bridge;
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bridge = bridge_create(name);
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if (bridge)
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{
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this->bridges->insert_last(this->bridges, bridge);
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}
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return bridge;
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}
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/**
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* Implementation of dumm_t.create_bridge_enumerator.
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*/
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static enumerator_t* create_bridge_enumerator(private_dumm_t *this)
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{
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return this->bridges->create_enumerator(this->bridges);
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}
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/**
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* Implementation of dumm_t.delete_bridge.
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*/
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static void delete_bridge(private_dumm_t *this, bridge_t *bridge)
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{
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if (this->bridges->remove(this->bridges, bridge, NULL))
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{
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bridge->destroy(bridge);
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}
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}
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/**
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* disable the currently enabled template
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*/
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static void clear_template(private_dumm_t *this)
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{
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enumerator_t *enumerator;
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guest_t *guest;
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free(this->template);
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this->template = NULL;
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enumerator = this->guests->create_enumerator(this->guests);
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while (enumerator->enumerate(enumerator, (void**)&guest))
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{
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guest->load_template(guest, NULL);
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}
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enumerator->destroy(enumerator);
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}
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/**
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* Implementation of dumm_t.load_template.
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*/
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static bool load_template(private_dumm_t *this, char *name)
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{
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enumerator_t *enumerator;
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guest_t *guest;
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char dir[PATH_MAX];
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size_t len;
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clear_template(this);
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if (name == NULL)
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{
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return TRUE;
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}
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free(this->template);
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asprintf(&this->template, "%s/%s", this->template_dir, name);
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len = snprintf(dir, sizeof(dir), "%s/%s", this->template, TEMPLATE_DIR_DIR);
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if (len < 0 || len >= sizeof(dir))
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{
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return FALSE;
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}
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if (access(this->template, F_OK) != 0)
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{ /* does not exist, create template */
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if (mkdir(this->template, PERME) != 0)
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{
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DBG1("creating template directory '%s' failed: %m", this->template);
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return FALSE;
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}
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if (mkdir(dir, PERME) != 0)
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{
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DBG1("creating template overlay directory '%s' failed: %m", dir);
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return FALSE;
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}
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}
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enumerator = this->guests->create_enumerator(this->guests);
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while (enumerator->enumerate(enumerator, (void**)&guest))
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{
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if (!guest->load_template(guest, dir))
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{
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enumerator->destroy(enumerator);
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clear_template(this);
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return FALSE;
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}
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}
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enumerator->destroy(enumerator);
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return TRUE;
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}
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/**
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* Implementation of dumm_t.destroy
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*/
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static void destroy(private_dumm_t *this)
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{
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enumerator_t *enumerator;
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guest_t *guest;
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this->bridges->destroy_offset(this->bridges, offsetof(bridge_t, destroy));
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enumerator = this->guests->create_enumerator(this->guests);
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while (enumerator->enumerate(enumerator, (void**)&guest))
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{
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guest->stop(guest, NULL);
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}
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enumerator->destroy(enumerator);
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this->destroying = TRUE;
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this->guests->destroy_offset(this->guests, offsetof(guest_t, destroy));
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free(this->guest_dir);
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free(this->template_dir);
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free(this->template);
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free(this->dir);
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free(this);
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}
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/**
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* load all guests in our working dir
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*/
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static void load_guests(private_dumm_t *this)
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{
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DIR *dir;
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struct dirent *ent;
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guest_t *guest;
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dir = opendir(this->guest_dir);
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if (dir == NULL)
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{
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return;
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}
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while ((ent = readdir(dir)))
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{
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if (streq(ent->d_name, ".") || streq(ent->d_name, ".."))
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{
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continue;
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}
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guest = guest_load(this->guest_dir, ent->d_name);
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if (guest)
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{
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this->guests->insert_last(this->guests, guest);
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}
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else
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{
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DBG1("loading guest in directory '%s' failed, skipped", ent->d_name);
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}
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}
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closedir(dir);
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}
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/**
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* create a dumm instance
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*/
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dumm_t *dumm_create(char *dir)
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{
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char cwd[PATH_MAX];
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private_dumm_t *this = malloc_thing(private_dumm_t);
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this->public.create_guest = (guest_t*(*)(dumm_t*,char*,char*,char*,int))create_guest;
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this->public.create_guest_enumerator = (enumerator_t*(*)(dumm_t*))create_guest_enumerator;
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this->public.delete_guest = (void(*)(dumm_t*,guest_t*))delete_guest;
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this->public.create_bridge = (bridge_t*(*)(dumm_t*, char *name))create_bridge;
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this->public.create_bridge_enumerator = (enumerator_t*(*)(dumm_t*))create_bridge_enumerator;
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this->public.delete_bridge = (void(*)(dumm_t*,bridge_t*))delete_bridge;
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this->public.load_template = (bool(*)(dumm_t*, char *name))load_template;
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this->public.destroy = (void(*)(dumm_t*))destroy;
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this->destroying = FALSE;
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if (dir && *dir == '/')
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{
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this->dir = strdup(dir);
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}
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else
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{
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if (getcwd(cwd, sizeof(cwd)) == NULL)
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{
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free(this);
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return NULL;
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}
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if (dir)
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{
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asprintf(&this->dir, "%s/%s", cwd, dir);
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}
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else
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{
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this->dir = strdup(cwd);
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}
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}
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this->template = NULL;
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asprintf(&this->guest_dir, "%s/%s", this->dir, GUEST_DIR);
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asprintf(&this->template_dir, "%s/%s", this->dir, TEMPLATE_DIR);
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this->guests = linked_list_create();
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this->bridges = linked_list_create();
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if (mkdir(this->guest_dir, PERME) < 0 && errno != EEXIST)
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{
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DBG1("creating guest directory '%s' failed: %m", this->guest_dir);
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destroy(this);
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return NULL;
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}
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if (mkdir(this->template_dir, PERME) < 0 && errno != EEXIST)
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{
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DBG1("creating template directory '%s' failed: %m", this->template_dir);
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destroy(this);
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return NULL;
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}
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load_guests(this);
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return &this->public;
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}
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