1/*
2 * Copyright (c) 1993 Ulrich Pegelow <pegelow@moorea.uni-muenster.de>
3 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6 * Copyright (c) 2003-2006 Roland McGrath <roland@redhat.com>
7 * Copyright (c) 2006-2015 Dmitry V. Levin <ldv@altlinux.org>
8 * Copyright (c) 2015-2017 The strace developers.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 *    derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#include "defs.h"
35#include "ipc_defs.h"
36
37#ifdef HAVE_SYS_MSG_H
38# include <sys/msg.h>
39#elif defined HAVE_LINUX_MSG_H
40# include <linux/msg.h>
41#endif
42
43#include "xlat/ipc_msg_flags.h"
44#include "xlat/resource_flags.h"
45
46SYS_FUNC(msgget)
47{
48	const int key = (int) tcp->u_arg[0];
49	if (key)
50		tprintf("%#x", key);
51	else
52		tprints("IPC_PRIVATE");
53	tprints(", ");
54	if (printflags(resource_flags, tcp->u_arg[1] & ~0777, NULL) != 0)
55		tprints("|");
56	print_numeric_umode_t(tcp->u_arg[1] & 0777);
57	return RVAL_DECODED;
58}
59
60static void
61tprint_msgsnd(struct tcb *const tcp, const kernel_ulong_t addr,
62	      const kernel_ulong_t count, const unsigned int flags)
63{
64	tprint_msgbuf(tcp, addr, count);
65	printflags(ipc_msg_flags, flags, "MSG_???");
66}
67
68SYS_FUNC(msgsnd)
69{
70	tprintf("%d, ", (int) tcp->u_arg[0]);
71	if (indirect_ipccall(tcp)) {
72		tprint_msgsnd(tcp, tcp->u_arg[3], tcp->u_arg[1],
73			      tcp->u_arg[2]);
74	} else {
75		tprint_msgsnd(tcp, tcp->u_arg[1], tcp->u_arg[2],
76			      tcp->u_arg[3]);
77	}
78	return RVAL_DECODED;
79}
80
81static void
82tprint_msgrcv(struct tcb *const tcp, const kernel_ulong_t addr,
83	      const kernel_ulong_t count, const kernel_ulong_t msgtyp)
84{
85	tprint_msgbuf(tcp, addr, count);
86	tprintf("%" PRI_kld ", ", msgtyp);
87}
88
89static int
90fetch_msgrcv_args(struct tcb *const tcp, const kernel_ulong_t addr,
91		  kernel_ulong_t *const pair)
92{
93	if (current_wordsize == sizeof(*pair)) {
94		if (umoven_or_printaddr(tcp, addr, 2 * sizeof(*pair), pair))
95			return -1;
96	} else {
97		unsigned int tmp[2];
98
99		if (umove_or_printaddr(tcp, addr, &tmp))
100			return -1;
101		pair[0] = tmp[0];
102		pair[1] = tmp[1];
103	}
104	return 0;
105}
106
107SYS_FUNC(msgrcv)
108{
109	if (entering(tcp)) {
110		tprintf("%d, ", (int) tcp->u_arg[0]);
111	} else {
112		if (indirect_ipccall(tcp)) {
113			const bool direct =
114#ifdef SPARC64
115				current_wordsize == 8 ||
116#endif
117				get_tcb_priv_ulong(tcp) != 0;
118			if (direct) {
119				tprint_msgrcv(tcp, tcp->u_arg[3],
120					      tcp->u_arg[1], tcp->u_arg[4]);
121			} else {
122				kernel_ulong_t pair[2];
123
124				if (fetch_msgrcv_args(tcp, tcp->u_arg[3], pair))
125					tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
126				else
127					tprint_msgrcv(tcp, pair[0],
128						      tcp->u_arg[1], pair[1]);
129			}
130			printflags(ipc_msg_flags, tcp->u_arg[2], "MSG_???");
131		} else {
132			tprint_msgrcv(tcp, tcp->u_arg[1],
133				tcp->u_arg[2], tcp->u_arg[3]);
134			printflags(ipc_msg_flags, tcp->u_arg[4], "MSG_???");
135		}
136	}
137	return 0;
138}
139