strace/ipc.c

/*
 * Copyright (c) 1993 Ulrich Pegelow <pegelow@moorea.uni-muenster.de>
 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "defs.h"
#ifdef HAVE_MQUEUE_H
# include <mqueue.h>
#endif
#include <fcntl.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <sys/msg.h>
#include <sys/shm.h>

#ifndef MSG_STAT
#define MSG_STAT 11
#endif
#ifndef MSG_INFO
#define MSG_INFO 12
#endif
#ifndef SHM_STAT
#define SHM_STAT 13
#endif
#ifndef SHM_INFO
#define SHM_INFO 14
#endif
#ifndef SEM_STAT
#define SEM_STAT 18
#endif
#ifndef SEM_INFO
#define SEM_INFO 19
#endif

#if !defined IPC_64
# define IPC_64 0x100
#endif

extern void printsigevent(struct tcb *tcp, long arg);

static const struct xlat msgctl_flags[] = {
	XLAT(IPC_RMID),
	XLAT(IPC_SET),
	XLAT(IPC_STAT),
	XLAT(IPC_INFO),
	XLAT(MSG_STAT),
	XLAT(MSG_INFO),
	XLAT_END
};

static const struct xlat semctl_flags[] = {
	XLAT(IPC_RMID),
	XLAT(IPC_SET),
	XLAT(IPC_STAT),
	XLAT(IPC_INFO),
	XLAT(SEM_STAT),
	XLAT(SEM_INFO),
	XLAT(GETPID),
	XLAT(GETVAL),
	XLAT(GETALL),
	XLAT(GETNCNT),
	XLAT(GETZCNT),
	XLAT(SETVAL),
	XLAT(SETALL),
	XLAT_END
};

static const struct xlat shmctl_flags[] = {
	XLAT(IPC_RMID),
	XLAT(IPC_SET),
	XLAT(IPC_STAT),
	XLAT(IPC_INFO),
	XLAT(SHM_STAT),
	XLAT(SHM_INFO),
#ifdef SHM_LOCK
	XLAT(SHM_LOCK),
#endif
#ifdef SHM_UNLOCK
	XLAT(SHM_UNLOCK),
#endif
	XLAT_END
};

static const struct xlat resource_flags[] = {
	XLAT(IPC_CREAT),
	XLAT(IPC_EXCL),
	XLAT(IPC_NOWAIT),
	XLAT_END
};

static const struct xlat shm_resource_flags[] = {
	XLAT(IPC_CREAT),
	XLAT(IPC_EXCL),
#ifdef SHM_HUGETLB
	XLAT(SHM_HUGETLB),
#endif
	XLAT_END
};

static const struct xlat shm_flags[] = {
	XLAT(SHM_REMAP),
	XLAT(SHM_RDONLY),
	XLAT(SHM_RND),
	XLAT_END
};

static const struct xlat ipc_msg_flags[] = {
	XLAT(MSG_NOERROR),
	XLAT(MSG_EXCEPT),
	XLAT(IPC_NOWAIT),
	XLAT_END
};

static const struct xlat semop_flags[] = {
	XLAT(SEM_UNDO),
	XLAT(IPC_NOWAIT),
	XLAT_END
};

int sys_msgget(struct tcb *tcp)
{
	if (entering(tcp)) {
		if (tcp->u_arg[0])
			tprintf("%#lx, ", tcp->u_arg[0]);
		else
			tprints("IPC_PRIVATE, ");
		if (printflags(resource_flags, tcp->u_arg[1] & ~0777, NULL) != 0)
			tprints("|");
		tprintf("%#lo", tcp->u_arg[1] & 0777);
	}
	return 0;
}

#ifdef IPC_64
# define PRINTCTL(flagset, arg, dflt) \
	if ((arg) & IPC_64) tprints("IPC_64|"); \
	printxval((flagset), (arg) &~ IPC_64, dflt)
#else
# define PRINTCTL printxval
#endif

static int
indirect_ipccall(struct tcb *tcp)
{
#ifdef X86_64
	return current_personality == 1;
#endif
#if defined IA64
	return tcp->scno < 1024; /* ia32 emulation syscalls are low */
#endif
#if defined(ALPHA) || defined(MIPS) || defined(HPPA) || defined(__ARM_EABI__) || defined(AARCH64)
	return 0;
#endif
	return 1;
}

int sys_msgctl(struct tcb *tcp)
{
	if (entering(tcp)) {
		tprintf("%lu, ", tcp->u_arg[0]);
		PRINTCTL(msgctl_flags, tcp->u_arg[1], "MSG_???");
		tprintf(", %#lx", tcp->u_arg[indirect_ipccall(tcp) ? 3 : 2]);
	}
	return 0;
}

static void
tprint_msgsnd(struct tcb *tcp, long addr, unsigned long count,
	      unsigned long flags)
{
	long mtype;

	if (umove(tcp, addr, &mtype) < 0) {
		tprintf("%#lx", addr);
	} else {
		tprintf("{%lu, ", mtype);
		printstr(tcp, addr + sizeof(mtype), count);
		tprints("}");
	}
	tprintf(", %lu, ", count);
	printflags(ipc_msg_flags, flags, "MSG_???");
}

int sys_msgsnd(struct tcb *tcp)
{
	if (entering(tcp)) {
		tprintf("%d, ", (int) tcp->u_arg[0]);
		if (indirect_ipccall(tcp)) {
			tprint_msgsnd(tcp, tcp->u_arg[3], tcp->u_arg[1],
				      tcp->u_arg[2]);
		} else {
			tprint_msgsnd(tcp, tcp->u_arg[1], tcp->u_arg[2],
				      tcp->u_arg[3]);
		}
	}
	return 0;
}

static void
tprint_msgrcv(struct tcb *tcp, long addr, unsigned long count, long msgtyp)
{
	long mtype;

	if (syserror(tcp) || umove(tcp, addr, &mtype) < 0) {
		tprintf("%#lx", addr);
	} else {
		tprintf("{%lu, ", mtype);
		printstr(tcp, addr + sizeof(mtype), count);
		tprints("}");
	}
	tprintf(", %lu, %ld, ", count, msgtyp);
}

int sys_msgrcv(struct tcb *tcp)
{
	if (entering(tcp)) {
		tprintf("%d, ", (int) tcp->u_arg[0]);
	} else {
		if (indirect_ipccall(tcp)) {
			struct ipc_wrapper {
				struct msgbuf *msgp;
				long msgtyp;
			} tmp;

			if (umove(tcp, tcp->u_arg[3], &tmp) < 0) {
				tprintf("%#lx, %lu, ",
					tcp->u_arg[3], tcp->u_arg[1]);
			} else {
				tprint_msgrcv(tcp, (long) tmp.msgp,
					tcp->u_arg[1], tmp.msgtyp);
			}
			printflags(ipc_msg_flags, tcp->u_arg[2], "MSG_???");
		} else {
			tprint_msgrcv(tcp, tcp->u_arg[1],
				tcp->u_arg[2], tcp->u_arg[3]);
			printflags(ipc_msg_flags, tcp->u_arg[4], "MSG_???");
		}
	}
	return 0;
}

static void
tprint_sembuf(struct tcb *tcp, long addr, unsigned long count)
{
	unsigned long i, max_count;

	if (abbrev(tcp))
		max_count = (max_strlen < count) ? max_strlen : count;
	else
		max_count = count;

	if (!max_count) {
		tprintf("%#lx, %lu", addr, count);
		return;
	}

	for (i = 0; i < max_count; ++i) {
		struct sembuf sb;
		if (i)
			tprints(", ");
		if (umove(tcp, addr + i * sizeof(struct sembuf), &sb) < 0) {
			if (i) {
				tprints("{???}");
				break;
			} else {
				tprintf("%#lx, %lu", addr, count);
				return;
			}
		} else {
			if (!i)
				tprints("{");
			tprintf("{%u, %d, ", sb.sem_num, sb.sem_op);
			printflags(semop_flags, sb.sem_flg, "SEM_???");
			tprints("}");
		}
	}

	if (i < max_count || max_count < count)
		tprints(", ...");

	tprintf("}, %lu", count);
}

int sys_semop(struct tcb *tcp)
{
	if (entering(tcp)) {
		tprintf("%lu, ", tcp->u_arg[0]);
		if (indirect_ipccall(tcp)) {
			tprint_sembuf(tcp, tcp->u_arg[3], tcp->u_arg[1]);
		} else {
			tprint_sembuf(tcp, tcp->u_arg[1], tcp->u_arg[2]);
		}
	}
	return 0;
}

int sys_semtimedop(struct tcb *tcp)
{
	if (entering(tcp)) {
		tprintf("%lu, ", tcp->u_arg[0]);
		if (indirect_ipccall(tcp)) {
			tprint_sembuf(tcp, tcp->u_arg[3], tcp->u_arg[1]);
			tprints(", ");
#if defined(S390) || defined(S390X)
			printtv(tcp, tcp->u_arg[2]);
#else
			printtv(tcp, tcp->u_arg[4]);
#endif
		} else {
			tprint_sembuf(tcp, tcp->u_arg[1], tcp->u_arg[2]);
			tprints(", ");
			printtv(tcp, tcp->u_arg[3]);
		}
	}
	return 0;
}

int sys_semget(struct tcb *tcp)
{
	if (entering(tcp)) {
		if (tcp->u_arg[0])
			tprintf("%#lx", tcp->u_arg[0]);
		else
			tprints("IPC_PRIVATE");
		tprintf(", %lu, ", tcp->u_arg[1]);
		if (printflags(resource_flags, tcp->u_arg[2] & ~0777, NULL) != 0)
			tprints("|");
		tprintf("%#lo", tcp->u_arg[2] & 0777);
	}
	return 0;
}

int sys_semctl(struct tcb *tcp)
{
	if (entering(tcp)) {
		tprintf("%lu, %lu, ", tcp->u_arg[0], tcp->u_arg[1]);
		PRINTCTL(semctl_flags, tcp->u_arg[2], "SEM_???");
		tprintf(", %#lx", tcp->u_arg[3]);
	}
	return 0;
}

int sys_shmget(struct tcb *tcp)
{
	if (entering(tcp)) {
		if (tcp->u_arg[0])
			tprintf("%#lx", tcp->u_arg[0]);
		else
			tprints("IPC_PRIVATE");
		tprintf(", %lu, ", tcp->u_arg[1]);
		if (printflags(shm_resource_flags, tcp->u_arg[2] & ~0777, NULL) != 0)
			tprints("|");
		tprintf("%#lo", tcp->u_arg[2] & 0777);
	}
	return 0;
}

int sys_shmctl(struct tcb *tcp)
{
	if (entering(tcp)) {
		tprintf("%lu, ", tcp->u_arg[0]);
		PRINTCTL(shmctl_flags, tcp->u_arg[1], "SHM_???");
		if (indirect_ipccall(tcp)) {
			tprintf(", %#lx", tcp->u_arg[3]);
		} else {
			tprintf(", %#lx", tcp->u_arg[2]);
		}
	}
	return 0;
}

int sys_shmat(struct tcb *tcp)
{
	if (exiting(tcp)) {
		tprintf("%lu", tcp->u_arg[0]);
		if (indirect_ipccall(tcp)) {
			tprintf(", %#lx, ", tcp->u_arg[3]);
			printflags(shm_flags, tcp->u_arg[1], "SHM_???");
		} else {
			tprintf(", %#lx, ", tcp->u_arg[1]);
			printflags(shm_flags, tcp->u_arg[2], "SHM_???");
		}
		if (syserror(tcp))
			return 0;
		if (indirect_ipccall(tcp)) {
			unsigned long raddr;
			if (umove(tcp, tcp->u_arg[2], &raddr) < 0)
				return RVAL_NONE;
			tcp->u_rval = raddr;
		}
		return RVAL_HEX;
	}
	return 0;
}

int sys_shmdt(struct tcb *tcp)
{
	if (entering(tcp)) {
		if (indirect_ipccall(tcp)) {
			tprintf("%#lx", tcp->u_arg[3]);
		} else {
			tprintf("%#lx", tcp->u_arg[0]);
		}
	}
	return 0;
}

int
sys_mq_open(struct tcb *tcp)
{
	if (entering(tcp)) {
		printpath(tcp, tcp->u_arg[0]);
		tprints(", ");
		/* flags */
		tprint_open_modes(tcp->u_arg[1]);
		if (tcp->u_arg[1] & O_CREAT) {
# ifndef HAVE_MQUEUE_H
			tprintf(", %lx", tcp->u_arg[2]);
# else
			struct mq_attr attr;
			/* mode */
			tprintf(", %#lo, ", tcp->u_arg[2]);
			if (umove(tcp, tcp->u_arg[3], &attr) < 0)
				tprints("{???}");
			else
				tprintf("{mq_maxmsg=%ld, mq_msgsize=%ld}",
					(long) attr.mq_maxmsg,
					(long) attr.mq_msgsize);
# endif
		}
	}
	return 0;
}

int
sys_mq_timedsend(struct tcb *tcp)
{
	if (entering(tcp)) {
		tprintf("%ld, ", tcp->u_arg[0]);
		printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
		tprintf(", %lu, %ld, ", tcp->u_arg[2], tcp->u_arg[3]);
		printtv(tcp, tcp->u_arg[4]);
	}
	return 0;
}

int
sys_mq_timedreceive(struct tcb *tcp)
{
	if (entering(tcp))
		tprintf("%ld, ", tcp->u_arg[0]);
	else {
		printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
		tprintf(", %lu, %ld, ", tcp->u_arg[2], tcp->u_arg[3]);
		printtv(tcp, tcp->u_arg[4]);
	}
	return 0;
}

int
sys_mq_notify(struct tcb *tcp)
{
	if (entering(tcp)) {
		tprintf("%ld, ", tcp->u_arg[0]);
		printsigevent(tcp, tcp->u_arg[1]);
	}
	return 0;
}

static void
printmqattr(struct tcb *tcp, long addr)
{
	if (addr == 0)
		tprints("NULL");
	else {
# ifndef HAVE_MQUEUE_H
		tprintf("%#lx", addr);
# else
		struct mq_attr attr;
		if (umove(tcp, addr, &attr) < 0) {
			tprints("{...}");
			return;
		}
		tprints("{mq_flags=");
		tprint_open_modes(attr.mq_flags);
		tprintf(", mq_maxmsg=%ld, mq_msgsize=%ld, mq_curmsg=%ld}",
			(long) attr.mq_maxmsg, (long) attr.mq_msgsize,
			(long) attr.mq_curmsgs);
# endif
	}
}

int
sys_mq_getsetattr(struct tcb *tcp)
{
	if (entering(tcp)) {
		tprintf("%ld, ", tcp->u_arg[0]);
		printmqattr(tcp, tcp->u_arg[1]);
		tprints(", ");
	} else
		printmqattr(tcp, tcp->u_arg[2]);
	return 0;
}

int
sys_ipc(struct tcb *tcp)
{
	return printargs(tcp);
}