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Filename : sysc_socket.stp
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# socket _____________________________________________________
# long sys_socket(int family, int type, int protocol)
#

@define _SYSCALL_SOCKET_NAME
%(
	name = "socket"
%)

@define _SYSCALL_SOCKET_ARGSTR
%(
	argstr = sprintf("%s, %s, %s", family_str, type_str, protocol_str)
%)

@define _SYSCALL_SOCKET_REGARGS
%(
	family = int_arg(1)
	type = int_arg(2)
	protocol = int_arg(3)
%)

@define _SYSCALL_SOCKETCALL_SOCKET_REGARGS
%(
	__args = &@ulong_cast(pointer_arg(2))
	family = __int32(user_ulong(&@ulong_cast(__args)[0]))
	type = __int32(user_ulong(&@ulong_cast(__args)[1]))
	protocol = __int32(user_ulong(&@ulong_cast(__args)[2]))
%)

@define _SYSCALL_COMPAT_SOCKETCALL_SOCKET_REGARGS
%(
	__args = &@uint_cast(pointer_arg(2))
	family = user_int(&@uint_cast(__args)[0])
	type = user_int(&@uint_cast(__args)[1])
	protocol = user_int(&@uint_cast(__args)[2])
%)

probe syscall.socket = dw_syscall.socket !, nd_syscall.socket ? {}
probe syscall.socket.return = dw_syscall.socket.return !,
                              nd_syscall.socket.return ? {}

# dw_socket _____________________________________________________

probe dw_syscall.socket = __syscall.socket ?, __syscall.socketcall.socket ?,
	__syscall.compat_socketcall.socket ?
{
	@_SYSCALL_SOCKET_NAME
	family_str = _sock_family_str(family)
	type_str = _sock_type_str(type)
	protocol_str = _sock_protocol_str(family, protocol)
	@_SYSCALL_SOCKET_ARGSTR
}
probe __syscall.socket = kernel.function("sys_socket").call ?
{
	@__syscall_gate(@const("__NR_socket"))
	family = __int32($family)
	type = __int32($type)
	protocol = __int32($protocol)
}
probe __syscall.socketcall.socket = kernel.function("sys_socketcall").call ?
{
	if (__int32($call) != @const("SYS_SOCKET")) next;
	family = __int32(user_ulong(&@ulong_cast($args)[0]))
	type = __int32(user_ulong(&@ulong_cast($args)[1]))
	protocol = __int32(user_ulong(&@ulong_cast($args)[2]))
}
probe __syscall.compat_socketcall.socket =
	kernel.function("compat_sys_socketcall").call ?
{
	if (__int32($call) != @const("SYS_SOCKET")) next;
	family = user_int(&@uint_cast($args)[0])
	type = user_int(&@uint_cast($args)[1])
	protocol = user_int(&@uint_cast($args)[2])
}
probe dw_syscall.socket.return = __syscall.return ?,
	__syscall.socketcall.socket.return ?
{
	@_SYSCALL_SOCKET_NAME
	@SYSC_RETVALSTR($return)
}
probe __syscall.return = kernel.function("sys_socket").return ?
{
	@__syscall_gate(@const("__NR_socket"))
}
probe __syscall.socketcall.socket.return =
	kernel.function("sys_socketcall").return ?,
	kernel.function("compat_sys_socketcall").return ?
{
	if (__int32(@entry($call)) != @const("SYS_SOCKET")) next;
}

# nd_socket _____________________________________________________

probe nd_syscall.socket = nd1_syscall.socket!, nd2_syscall.socket!, tp_syscall.socket
  { }

probe nd1_syscall.socket = __nd1_syscall.socket ?,
	__nd1_syscall.socketcall.socket ?, __nd1_syscall.compat_socketcall.socket ?
{
	@_SYSCALL_SOCKET_NAME
	family_str = _sock_family_str(family)
	type_str = _sock_type_str(type)
	protocol_str = _sock_protocol_str(family, protocol)
	@_SYSCALL_SOCKET_ARGSTR
}
probe __nd1_syscall.socket = kprobe.function("sys_socket") ?
{
	@__syscall_gate(@const("__NR_socket"))
	asmlinkage()
	@_SYSCALL_SOCKET_REGARGS
}
probe __nd1_syscall.socketcall.socket = kprobe.function("sys_socketcall").call ?
{
	asmlinkage()
	if (int_arg(1) != @const("SYS_SOCKET")) next;
	@_SYSCALL_SOCKETCALL_SOCKET_REGARGS
}
probe __nd1_syscall.compat_socketcall.socket =
	kprobe.function("compat_sys_socketcall").call ?
{
	asmlinkage()
	if (int_arg(1) != @const("SYS_SOCKET")) next;
	@_SYSCALL_COMPAT_SOCKETCALL_SOCKET_REGARGS
}

/* kernel 4.17+ */
probe nd2_syscall.socket = __nd2_syscall.socket ?,
	__nd2_syscall.socketcall.socket ?, __nd2_syscall.compat_socketcall.socket ?
{
	@_SYSCALL_SOCKET_NAME
	family_str = _sock_family_str(family)
	type_str = _sock_type_str(type)
	protocol_str = _sock_protocol_str(family, protocol)
	@_SYSCALL_SOCKET_ARGSTR
}
probe __nd2_syscall.socket = kprobe.function(@arch_syscall_prefix "sys_socket") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_SOCKET_REGARGS
}
probe __nd2_syscall.socketcall.socket = kprobe.function(@arch_syscall_prefix "sys_socketcall").call ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	if (int_arg(1) != @const("SYS_SOCKET")) next;
	@_SYSCALL_SOCKETCALL_SOCKET_REGARGS
}
probe __nd2_syscall.compat_socketcall.socket =
	kprobe.function(@arch_syscall_prefix "compat_sys_socketcall").call ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	if (int_arg(1) != @const("SYS_SOCKET")) next;
	@_SYSCALL_COMPAT_SOCKETCALL_SOCKET_REGARGS
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.socket = __tp_syscall.socket ?,
	__tp_syscall.socketcall.socket ?
{
	@_SYSCALL_SOCKET_NAME
	family_str = _sock_family_str(family)
	type_str = _sock_type_str(type)
	protocol_str = _sock_protocol_str(family, protocol)
	@_SYSCALL_SOCKET_ARGSTR
}
probe __tp_syscall.socket = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_gate(@const("__NR_socket"))
	@_SYSCALL_SOCKET_REGARGS
}
probe __tp_syscall.socketcall.socket = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_socketcall"), @const("__NR_compat_socketcall"))
	if (int_arg(1) != @const("SYS_SOCKET")) next;
	if (@__compat_task) {
		@_SYSCALL_COMPAT_SOCKETCALL_SOCKET_REGARGS
	}
	else {
		@_SYSCALL_SOCKETCALL_SOCKET_REGARGS
	}
}

probe nd_syscall.socket.return = nd1_syscall.socket.return!, nd2_syscall.socket.return!, tp_syscall.socket.return
  { }

probe nd1_syscall.socket.return = __nd1_syscall.socket.return ?,
	__nd1_syscall.socketcall.socket.return ?
{
	@_SYSCALL_SOCKET_NAME
	@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.socket.return = kprobe.function("sys_socket").return ?
{
	@__syscall_gate(@const("__NR_socket"))
}
probe __nd1_syscall.socketcall.socket.return =
	kprobe.function("sys_socketcall").return ?,
	kprobe.function("compat_sys_socketcall").return ?
{
	if (@entry(__asmlinkage_int_arg(1)) != @const("SYS_SOCKET")) next;
}

/* kernel 4.17+ */
probe nd2_syscall.socket.return =
	kprobe.function(@arch_syscall_prefix "sys_socket").return ?,
	__nd2_syscall.socketcall.socket.return ?
{
	@_SYSCALL_SOCKET_NAME
	@SYSC_RETVALSTR(returnval())
}
probe __nd2_syscall.socketcall.socket.return =
	kprobe.function(@arch_syscall_prefix "sys_socketcall").return ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_socketcall").return ?
{
	__set_syscall_pt_regs(@entry(pointer_arg(1)))
	if (int_arg(1) != @const("SYS_SOCKET")) next;
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.socket.return = __tp_syscall.socket.return ?,
	__tp_syscall.socketcall.socket.return ?
{
	@_SYSCALL_SOCKET_NAME
	@SYSC_RETVALSTR($ret)
}
probe __tp_syscall.socket.return = kernel.trace("sys_exit")
{
	@__syscall_gate(@const("__NR_socket"))
}
probe __tp_syscall.socketcall.socket.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_socketcall"), @const("__NR_compat_socketcall"))
	if (int_arg(1) != @const("SYS_SOCKET")) next;
}