/*

   nsjail - common structures
   -----------------------------------------

   Copyright 2014 Google Inc. All Rights Reserved.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

*/

#ifndef NS_COMMON_H
#define NS_COMMON_H

#include <limits.h>
#include <linux/filter.h>
#include <netinet/ip6.h>
#include <stdbool.h>
#include <sys/queue.h>
#include <sys/resource.h>
#include <sys/types.h>

#define ARRAYSIZE(array) (sizeof(array) / sizeof(*array))

#if 0				/* Works, but needs -fblocks and libBlocksRuntime with clang */
/* Go-style defer implementation */
#define __STRMERGE(a, b) a##b
#define _STRMERGE(a, b) __STRMERGE(a, b)

#ifdef __clang__
static void __attribute__ ((unused)) __clang_cleanup_func(void (^*dfunc) (void))
{
	(*dfunc) ();
}

#define defer void (^_STRMERGE(__defer_f_, __COUNTER__))(void) __attribute__((cleanup(__clang_cleanup_func))) __attribute__((unused)) = ^
#else
#define __block
#define _DEFER(a, count) \
    auto void _STRMERGE(__defer_f_, count)(void *_defer_arg __attribute__((unused))); \
    int _STRMERGE(__defer_var_, count) __attribute__((cleanup(_STRMERGE(__defer_f_, count)))) __attribute__((unused)); \
    void _STRMERGE(__defer_f_, count)(void *_defer_arg __attribute__((unused)))
#define defer _DEFER(a, __COUNTER__)
#endif
#endif

struct pids_t {
	pid_t pid;
	time_t start;
	char remote_txt[64];
	struct sockaddr_in6 remote_addr;
	int pid_syscall_fd;
	 TAILQ_ENTRY(pids_t) pointers;
};

struct mounts_t {
	const char *src;
	const char *dst;
	const char *fs_type;
	const char *options;
	uintptr_t flags;
	 TAILQ_ENTRY(mounts_t) pointers;
};

struct fds_t {
	int fd;
	 TAILQ_ENTRY(fds_t) pointers;
};

enum ns_mode_t {
	MODE_LISTEN_TCP = 0,
	MODE_STANDALONE_ONCE,
	MODE_STANDALONE_EXECVE,
	MODE_STANDALONE_RERUN
};

struct charptr_t {
	char *val;
	 TAILQ_ENTRY(charptr_t) pointers;
};

struct nsjconf_t {
	const char *hostname;
	const char *cwd;
	char *const *argv;
	int port;
	const char *bindhost;
	bool daemonize;
	time_t tlimit;
	bool apply_sandbox;
	bool verbose;
	bool keep_env;
	bool keep_caps;
	bool disable_no_new_privs;
	__rlim64_t rl_as;
	__rlim64_t rl_core;
	__rlim64_t rl_cpu;
	__rlim64_t rl_fsize;
	__rlim64_t rl_nofile;
	__rlim64_t rl_nproc;
	__rlim64_t rl_stack;
	unsigned long personality;
	bool clone_newnet;
	bool clone_newuser;
	bool clone_newns;
	bool clone_newpid;
	bool clone_newipc;
	bool clone_newuts;
	bool clone_newcgroup;
	enum ns_mode_t mode;
	const char *chroot;
	bool is_root_rw;
	bool is_silent;
	bool skip_setsid;
	uid_t outside_uid;
	gid_t outside_gid;
	uid_t inside_uid;
	gid_t inside_gid;
	unsigned int max_conns_per_ip;
	size_t tmpfs_size;
	bool mount_proc;
	bool iface_no_lo;
	const char *iface;
	const char *iface_vs_ip;
	const char *iface_vs_nm;
	const char *iface_vs_gw;
	const char *cgroup_mem_mount;
	const char *cgroup_mem_parent;
	size_t cgroup_mem_max;
	struct sock_fprog seccomp_fprog;
	 TAILQ_HEAD(envlist, charptr_t) envs;
	 TAILQ_HEAD(pidslist, pids_t) pids;
	 TAILQ_HEAD(mountptslist, mounts_t) mountpts;
	 TAILQ_HEAD(fdslistt, fds_t) open_fds;
};

#endif				/* NS_COMMON_H */