1 files changed, 391 insertions, 0 deletions

diff --git a/src/dumm/dumm.c b/src/dumm/dumm.c
new file mode 100644
index 000000000..b9a2814e6
--- /dev/null
+++ b/src/dumm/dumm.c
@@ -0,0 +1,391 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#define _GNU_SOURCE
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <dirent.h>
+#include <errno.h>
+
+#include <debug.h>
+
+#include "dumm.h"
+
+#define PERME (S_IRWXU | S_IRWXG)
+#define GUEST_DIR "guests"
+#define TEMPLATE_DIR "templates"
+#define TEMPLATE_DIR_DIR "diff"
+
+/**
+ * instances of dumm, used to deliver signals
+ */
+static linked_list_t *instances = NULL;
+
+typedef struct private_dumm_t private_dumm_t;
+
+struct private_dumm_t {
+	/** public dumm interface */
+	dumm_t public;
+	/** working dir */
+	char *dir;
+	/** directory of guests */
+	char *guest_dir;
+	/** directory of templates */
+	char *template_dir;
+	/** directory of loaded template */
+	char *template;
+	/** list of managed guests */
+	linked_list_t *guests;
+	/** list of managed bridges */
+	linked_list_t *bridges;
+	/** do not catch signals if we are destroying */
+	bool destroying;
+};
+
+/**
+ * Implementation of dumm_t.create_guest.
+ */
+static guest_t* create_guest(private_dumm_t *this, char *name, char *kernel, 
+							 char *master, int mem)
+{
+	guest_t *guest;
+	
+	guest = guest_create(this->guest_dir, name, kernel, master, mem);
+	if (guest)
+	{
+		this->guests->insert_last(this->guests, guest);
+	}
+	return guest;
+}
+
+/**
+ * Implementation of dumm_t.create_guest_iterator.
+ */
+static iterator_t* create_guest_iterator(private_dumm_t *this)
+{
+	return this->guests->create_iterator(this->guests, TRUE);
+}
+
+/**
+ * Implementation of dumm_t.create_bridge.
+ */
+static bridge_t* create_bridge(private_dumm_t *this, char *name)
+{
+	bridge_t *bridge;
+	
+	bridge = bridge_create(name);
+	if (bridge)
+	{
+		this->bridges->insert_last(this->bridges, bridge);
+	}
+	return bridge;
+}
+
+/**
+ * Implementation of dumm_t.create_bridge_iterator.
+ */
+static iterator_t* create_bridge_iterator(private_dumm_t *this)
+{
+	return this->bridges->create_iterator(this->bridges, TRUE);
+}
+
+/**
+ * disable the currently enabled template 
+ */
+static void clear_template(private_dumm_t *this)
+{
+	iterator_t *iterator, *ifaces;
+	guest_t *guest;
+	iface_t *iface;
+
+	free(this->template);
+	this->template = NULL;
+
+	iterator = this->guests->create_iterator(this->guests, TRUE);
+	while (iterator->iterate(iterator, (void**)&guest))
+	{
+		guest->load_template(guest, NULL);
+		ifaces = guest->create_iface_iterator(guest);
+		while (ifaces->iterate(ifaces, (void**)&iface))
+		{
+			ifaces->remove(ifaces);
+			iface->destroy(iface);
+		}
+		ifaces->destroy(ifaces);
+	}
+	iterator->destroy(iterator);
+}
+
+/**
+ * Implementation of dumm_t.load_template.
+ */
+static bool load_template(private_dumm_t *this, char *name)
+{
+	iterator_t *iterator;
+	guest_t *guest;
+	char dir[PATH_MAX];
+	size_t len;
+	
+	clear_template(this);
+	
+	if (name == NULL)
+	{
+		return TRUE;
+	}
+
+	free(this->template);
+	asprintf(&this->template, "%s/%s", this->template_dir, name);
+	len = snprintf(dir, sizeof(dir), "%s/%s", this->template, TEMPLATE_DIR_DIR);
+	if (len < 0 || len >= sizeof(dir))
+	{
+		return FALSE;
+	}
+	
+	if (access(this->template, F_OK) != 0)
+	{	/* does not exist, create template */
+		if (mkdir(this->template, PERME) != 0)
+		{
+			DBG1("creating template directory '%s' failed: %m", this->template);
+			return FALSE;
+		}
+		if (mkdir(dir, PERME) != 0)
+		{
+			DBG1("creating template overlay directory '%s' failed: %m", dir);
+			return FALSE;
+		}
+	}
+	iterator = this->guests->create_iterator(this->guests, TRUE);
+	while (iterator->iterate(iterator, (void**)&guest))
+	{
+		if (!guest->load_template(guest, dir))
+		{
+			iterator->destroy(iterator);
+			clear_template(this);
+			return FALSE;
+		}
+	}
+	iterator->destroy(iterator);
+	return TRUE;
+}
+
+/**
+ * signal handler 
+ */
+void signal_handler(int sig, siginfo_t *info, void *ucontext)
+{
+	if (sig == SIGCHLD)
+	{
+		switch (info->si_code)
+		{
+			case CLD_EXITED:
+			case CLD_KILLED:
+			case CLD_DUMPED:
+			{
+				private_dumm_t *this;
+				guest_t *guest;
+				iterator_t *iterator, *guests;
+				
+				iterator = instances->create_iterator(instances, TRUE);
+				while (iterator->iterate(iterator, (void**)&this))
+				{
+					if (this->destroying)
+					{
+						continue;
+					}
+					guests = this->guests->create_iterator(this->guests, TRUE);
+					while (guests->iterate(guests, (void**)&guest))
+					{
+						if (guest->get_pid(guest) == info->si_pid)
+						{
+							guest->sigchild(guest);
+							break;
+						}
+					}
+					guests->destroy(guests);
+				}
+				iterator->destroy(iterator);
+				break;
+			}
+			default:
+				break;
+		}
+
+	}
+	/* SIGHUP is currently just ignored */
+}
+
+/**
+ * add a dumm instance
+ */
+static void add_instance(private_dumm_t *this)
+{
+	if (instances == NULL)
+	{
+		struct sigaction action;
+		
+		instances = linked_list_create();
+		
+		memset(&action, 0, sizeof(action));
+		action.sa_sigaction = signal_handler;
+		action.sa_flags = SA_SIGINFO;
+		
+		if (sigaction(SIGCHLD, &action, NULL) != 0 ||
+			sigaction(SIGHUP, &action, NULL) != 0)
+		{
+			DBG1("installing signal handler failed!");
+		}
+	}
+	instances->insert_last(instances, this);
+}
+
+/**
+ * remove a dumm instance
+ */
+static void remove_instance(private_dumm_t *this)
+{
+	iterator_t *iterator;
+	private_dumm_t *current;
+	
+	iterator = instances->create_iterator(instances, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		if (current == this)
+		{
+			iterator->remove(iterator);
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+	if (instances->get_count(instances) == 0)
+	{
+		instances->destroy(instances);
+		instances = NULL;
+	}
+}
+
+/**
+ * Implementation of dumm_t.destroy
+ */
+static void destroy(private_dumm_t *this)
+{
+	iterator_t *iterator;
+	guest_t *guest;
+
+	this->bridges->destroy_offset(this->bridges, offsetof(bridge_t, destroy));
+	
+	iterator = this->guests->create_iterator(this->guests, TRUE);
+	while (iterator->iterate(iterator, (void**)&guest))
+	{
+		guest->stop(guest);
+	}
+	iterator->destroy(iterator);
+	
+	this->destroying = TRUE;
+	this->guests->destroy_offset(this->guests, offsetof(guest_t, destroy));
+	free(this->guest_dir);
+	free(this->template_dir);
+	free(this->template);
+	free(this->dir);
+	remove_instance(this);
+	free(this);
+}
+
+/**
+ * load all guests in our working dir
+ */
+static void load_guests(private_dumm_t *this)
+{
+	DIR *dir;
+	struct dirent *ent;
+	guest_t *guest;
+	
+	dir = opendir(this->guest_dir);
+	if (dir == NULL)
+	{
+		return;
+	}
+	
+	while ((ent = readdir(dir)))
+	{
+		if (streq(ent->d_name, ".") ||  streq(ent->d_name, ".."))
+		{
+			continue;
+		}
+		guest = guest_load(this->guest_dir, ent->d_name);
+		if (guest)
+		{
+			DBG1("loaded guest '%s'", ent->d_name);
+			this->guests->insert_last(this->guests, guest);
+		}
+		else
+		{
+			DBG1("loading guest in directory '%s' failed, skipped", ent->d_name);
+		}
+	}
+	closedir(dir);
+}
+
+/**
+ * create a dumm instance
+ */
+dumm_t *dumm_create(char *dir)
+{
+	char cwd[PATH_MAX];
+	private_dumm_t *this = malloc_thing(private_dumm_t);
+	
+	this->public.create_guest = (guest_t*(*)(dumm_t*,char*,char*,char*,int))create_guest;
+	this->public.create_guest_iterator = (iterator_t*(*)(dumm_t*))create_guest_iterator;
+	this->public.create_bridge = (bridge_t*(*)(dumm_t*, char *name))create_bridge;
+	this->public.create_bridge_iterator = (iterator_t*(*)(dumm_t*))create_bridge_iterator;
+	this->public.load_template = (bool(*)(dumm_t*, char *name))load_template;
+	this->public.destroy = (void(*)(dumm_t*))destroy;
+	
+	this->destroying = FALSE;
+	if (*dir == '/' || getcwd(cwd, sizeof(cwd)) == 0)
+	{
+		this->dir = strdup(dir);
+	}
+	else
+	{
+		asprintf(&this->dir, "%s/%s", cwd, dir);
+	}
+	this->template = NULL;
+	asprintf(&this->guest_dir, "%s/%s", this->dir, GUEST_DIR);
+	asprintf(&this->template_dir, "%s/%s", this->dir, TEMPLATE_DIR);
+	this->guests = linked_list_create();
+	this->bridges = linked_list_create();
+	
+	add_instance(this);
+	
+	if (mkdir(this->guest_dir, PERME) < 0 && errno != EEXIST)
+	{
+		DBG1("creating guest directory '%s' failed: %m", this->guest_dir);
+		destroy(this);
+		return NULL;
+	}
+	if (mkdir(this->template_dir, PERME) < 0 && errno != EEXIST)
+	{
+		DBG1("creating template directory '%s' failed: %m", this->template_dir);
+		destroy(this);
+		return NULL;
+	}
+	
+	load_guests(this);
+	return &this->public;
+}
+