[unix-history] / usr / src / sys / kern / kern_ktrace.c

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *	@(#)kern_ktrace.c	1.4 (Berkeley) %G%
 */

#ifdef KTRACE

#include "param.h"
#include "user.h"
#include "proc.h"
#include "file.h"
#include "vnode.h"
#include "ktrace.h"
#include "malloc.h"

#include "syscalls.c"

extern int nsysent;
extern char *syscallnames[];

int ktrace_nocheck = 1;

struct ktr_header *
ktrgetheader(type)
{
	register struct ktr_header *kth;

	MALLOC(kth, struct ktr_header *, sizeof (struct ktr_header), 
		M_TEMP, M_WAITOK);
	kth->ktr_type = type;
	microtime(&kth->ktr_time);
	kth->ktr_pid = u.u_procp->p_pid;
	bcopy(u.u_comm, kth->ktr_comm, MAXCOMLEN);
	return (kth);
}

ktrsyscall(vp, code, narg)
	struct vnode *vp;
{
	struct	ktr_header *kth = ktrgetheader(KTR_SYSCALL);
	struct	ktr_syscall *ktp;
	register len = sizeof(struct ktr_syscall) + (narg * sizeof(int));
	int 	*argp, i;

	if (kth == NULL)
		return;
	MALLOC(ktp, struct ktr_syscall *, len, M_TEMP, M_WAITOK);
	ktp->ktr_code = code;
	ktp->ktr_narg = narg;
	argp = (int *)((char *)ktp + sizeof(struct ktr_syscall));
	for (i = 0; i < narg; i++)
		*argp++ = u.u_arg[i];
	kth->ktr_buf = (caddr_t)ktp;
	kth->ktr_len = len;
	ktrwrite(vp, kth);
	FREE(ktp, M_TEMP);
	FREE(kth, M_TEMP);
}

ktrsysret(vp, code)
	struct vnode *vp;
{
	struct ktr_header *kth = ktrgetheader(KTR_SYSRET);
	struct ktr_sysret *ktp;

	if (kth == NULL)
		return;
	MALLOC(ktp, struct ktr_sysret *, sizeof(struct ktr_sysret),
		M_TEMP , M_WAITOK);
	ktp->ktr_code = code;
	ktp->ktr_eosys = u.u_eosys;
	ktp->ktr_error = u.u_error;
	ktp->ktr_retval = u.u_r.r_val1;		/* what about val2 ? */

	kth->ktr_buf = (caddr_t)ktp;
	kth->ktr_len = sizeof(struct ktr_sysret);

	ktrwrite(vp, kth);
	FREE(ktp, M_TEMP);
	FREE(kth, M_TEMP);
}

ktrnamei(vp, path)
	struct vnode *vp;
	char *path;
{
	struct ktr_header *kth = ktrgetheader(KTR_NAMEI);

	if (kth == NULL)
		return;
	kth->ktr_len = strlen(path);
	kth->ktr_buf = path;

	ktrwrite(vp, kth);
	FREE(kth, M_TEMP);
}

ktrgenio(vp, fd, rw, iov, len)
	struct vnode *vp;
	enum uio_rw rw;
	register struct iovec *iov;
{
	struct ktr_header *kth = ktrgetheader(KTR_GENIO);
	register struct ktr_genio *ktp;
	register caddr_t cp;
	register int resid = len, cnt;
	
	if (kth == NULL || u.u_error)
		return;
	MALLOC(ktp, struct ktr_genio *, sizeof(struct ktr_genio) + len,
		M_TEMP, M_WAITOK);
	ktp->ktr_fd = fd;
	ktp->ktr_rw = rw;
	cp = (caddr_t)((char *)ktp + sizeof (struct ktr_genio));
	while (resid > 0) {
		if ((cnt = iov->iov_len) > resid)
			cnt = resid;
		if (copyin(iov->iov_base, cp, cnt))
			goto done;
		cp += cnt;
		resid -= cnt;
		iov++;
	}
	kth->ktr_buf = (caddr_t)ktp;
	kth->ktr_len = sizeof (struct ktr_genio) + len;

	ktrwrite(vp, kth);
done:
	FREE(kth, M_TEMP);
	FREE(ktp, M_TEMP);
}

/*
 * ktrace system call
 */
ktrace()
{
	register struct a {
		char	*fname;
		int	ops;
		int	facs;
		int	pid;
	} *uap = (struct a *)u.u_ap;
	register struct vnode *vp = NULL;
	register struct nameidata *ndp = &u.u_nd;
	register struct proc *p;
	struct pgrp *pg;
	register int ops = uap->ops&0x3;
	register int facs = uap->facs;
	register int ret = 0;

	/*
	 * Until security implications are thought through,
	 * limit tracing to root (unless ktrace_nocheck is set).
	 */
	if (!ktrace_nocheck && (u.u_error = suser(u.u_cred, &u.u_acflag)))
		return;
	if (ops != KTROP_CLEAR) {
		/*
		 * an operation which requires a file argument.
		 */
		ndp->ni_segflg = UIO_USERSPACE;
		ndp->ni_dirp = uap->fname;
		if (u.u_error = vn_open(ndp, FREAD|FWRITE, 0))
			return;
		vp = ndp->ni_vp;
		if (vp->v_type != VREG) {
			u.u_error = EACCES;
			vrele(vp);
			return;
		}
	}
	/*
	 * Clear all uses of the tracefile
	 */
	if (ops == KTROP_CLEARFILE) {
		for (p = allproc; p != NULL; p = p->p_nxt) {
			if (p->p_tracep == vp) {
				p->p_flag &= ~SKTR;
				p->p_tracep = NULL;
				p->p_traceflag = 0;
				vrele(vp);
			}
		}
		goto done;
	}

	/*
	 * need something to (un)trace
	 */
	if (!facs) {
		u.u_error = EINVAL;
		goto done;
	}

	if (uap->pid < 0) {
		pg = pgfind(-uap->pid);
		if (pg == NULL) {
			u.u_error = ESRCH;
			goto done;
		}
		for (p = pg->pg_mem; p != NULL; p = p->p_pgrpnxt)
			if (uap->ops&KTROP_INHERITFLAG)
				ret |= ktrsetchildren(p, ops, facs, vp);
			else 
				ret |= ktrops(p, ops, facs, vp);
					
	} else {
		p = pfind(uap->pid);
		if (p == NULL) {
			u.u_error = ESRCH;
			goto done;
		}
		if (uap->ops&KTROP_INHERITFLAG)
			ret |= ktrsetchildren(p, ops, facs, vp);
		else
			ret |= ktrops(p, ops, facs, vp);
	}
	if (!ret)
		u.u_error = EPERM;
done:
	if (vp != NULL)
		vrele(vp);
}

ktrops(p, ops, facs, vp)
	struct proc *p;
	struct vnode *vp;
{

	if (u.u_uid && u.u_uid != p->p_uid)
		return 0;
	if (ops == KTROP_SET) {
		if (p->p_tracep != vp) {
			/*
			 * if trace file already in use, relinquish
			 */
			if (p->p_tracep != NULL)
				vrele(p->p_tracep);
			if (vp->v_count == 0)
				panic("ktrace: bad vnode");
			p->p_tracep = vp;
		}
		p->p_traceflag |= facs;
	} else {	
		/* KTROP_CLEAR */
		if ((p->p_traceflag &= ~facs) == 0) {
			if (p->p_tracep != NULL) {
				vrele(p->p_tracep);
				p->p_tracep = NULL;
			}
			p->p_flag &= ~SKTR;
		}
	}

	return 1;
}

ktrsetchildren(top, ops, facs, vp)
	struct proc *top;
	struct vnode *vp;
{
	register struct proc *p;
	register int ndx;
	register int ret = 0;

	p = top;
	for (;;) {
		if ((ret |= ktrops(p, ops, facs, vp)) && ops == KTROP_SET)
			p->p_flag |= SKTR;
		/*
		 * If this process has children, descend to them next,
		 * otherwise do any siblings, and if done with this level,
		 * follow back up the tree (but not past top).
		 */
		if (p->p_cptr)
			p = p->p_cptr;
		else if (p == top)
			return ret;
		else if (p->p_osptr)
			p = p->p_osptr;
		else for (;;) {
			p = p->p_pptr;
			if (p == top)
				return ret;
			if (p->p_osptr) {
				p = p->p_osptr;
				break;
			}
		}
	}
	/*NOTREACHED*/
}

ktrwrite(vp, kth)
	struct vnode *vp;
	register struct ktr_header *kth;
{
	struct uio auio;
	struct iovec aiov[2];
	int offset, error;

	if (vp == NULL)
		return;
	auio.uio_iov = &aiov[0];
	auio.uio_offset = 0;
	auio.uio_segflg = UIO_SYSSPACE;
	auio.uio_rw = UIO_WRITE;
	aiov[0].iov_base = (caddr_t)kth;
	aiov[0].iov_len = sizeof(struct ktr_header);
	auio.uio_resid = sizeof(struct ktr_header);
	auio.uio_iovcnt = 1;
	if (kth->ktr_len > 0) {
		auio.uio_iovcnt++;
		aiov[1].iov_base = kth->ktr_buf;
		aiov[1].iov_len = kth->ktr_len;
		auio.uio_resid += kth->ktr_len;
	}
	error = VOP_WRITE(vp, &auio, &offset, IO_UNIT|IO_APPEND, u.u_cred);
}
#endif
Commit	Line	Data
2d68027d MT	1	/*
	2	* Copyright (c) 1989 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms are permitted
	6	* provided that the above copyright notice and this paragraph are
	7	* duplicated in all such forms and that any documentation,
	8	* advertising materials, and other materials related to such
	9	* distribution and use acknowledge that the software was developed
	10	* by the University of California, Berkeley. The name of the
	11	* University may not be used to endorse or promote products derived
	12	* from this software without specific prior written permission.
	13	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	15	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
	16	*
c4ec2128	17	* @(#)kern_ktrace.c 1.4 (Berkeley) %G%
2d68027d MT	18	*/
	19
	20	#ifdef KTRACE
	21
	22	#include "param.h"
2d68027d	23	#include "user.h"
2d68027d	24	#include "proc.h"
c4ec2128 KM	25	#include "file.h"
c4ec2128 KM	26	#include "vnode.h"
2d68027d MT	27	#include "ktrace.h"
	28	#include "malloc.h"
	29
f73d8bd6	30	#include "syscalls.c"
2d68027d MT	31
	32	extern int nsysent;
	33	extern char *syscallnames[];
	34
f73d8bd6 MT	35	int ktrace_nocheck = 1;
f73d8bd6 MT	36
2d68027d MT	37	struct ktr_header *
	38	ktrgetheader(type)
	39	{
	40	register struct ktr_header *kth;
	41
	42	MALLOC(kth, struct ktr_header *, sizeof (struct ktr_header),
	43	M_TEMP, M_WAITOK);
2d68027d	44	kth->ktr_type = type;
f73d8bd6	45	microtime(&kth->ktr_time);
2d68027d MT	46	kth->ktr_pid = u.u_procp->p_pid;
2d68027d MT	47	bcopy(u.u_comm, kth->ktr_comm, MAXCOMLEN);
2d68027d MT	48	return (kth);
	49	}
	50
c4ec2128 KM	51	ktrsyscall(vp, code, narg)
c4ec2128 KM	52	struct vnode *vp;
2d68027d MT	53	{
	54	struct ktr_header *kth = ktrgetheader(KTR_SYSCALL);
	55	struct ktr_syscall *ktp;
	56	register len = sizeof(struct ktr_syscall) + (narg * sizeof(int));
	57	int *argp, i;
	58
f73d8bd6	59	if (kth == NULL)
2d68027d	60	return;
2d68027d	61	MALLOC(ktp, struct ktr_syscall *, len, M_TEMP, M_WAITOK);
2d68027d MT	62	ktp->ktr_code = code;
	63	ktp->ktr_narg = narg;
	64	argp = (int )((char )ktp + sizeof(struct ktr_syscall));
	65	for (i = 0; i < narg; i++)
	66	*argp++ = u.u_arg[i];
	67	kth->ktr_buf = (caddr_t)ktp;
	68	kth->ktr_len = len;
c4ec2128	69	ktrwrite(vp, kth);
2d68027d MT	70	FREE(ktp, M_TEMP);
	71	FREE(kth, M_TEMP);
	72	}
	73
c4ec2128 KM	74	ktrsysret(vp, code)
c4ec2128 KM	75	struct vnode *vp;
2d68027d MT	76	{
	77	struct ktr_header *kth = ktrgetheader(KTR_SYSRET);
	78	struct ktr_sysret *ktp;
	79
f73d8bd6	80	if (kth == NULL)
2d68027d	81	return;
2d68027d MT	82	MALLOC(ktp, struct ktr_sysret *, sizeof(struct ktr_sysret),
2d68027d MT	83	M_TEMP , M_WAITOK);
2d68027d MT	84	ktp->ktr_code = code;
	85	ktp->ktr_eosys = u.u_eosys;
	86	ktp->ktr_error = u.u_error;
	87	ktp->ktr_retval = u.u_r.r_val1; /* what about val2 ? */
	88
	89	kth->ktr_buf = (caddr_t)ktp;
	90	kth->ktr_len = sizeof(struct ktr_sysret);
	91
c4ec2128	92	ktrwrite(vp, kth);
2d68027d MT	93	FREE(ktp, M_TEMP);
	94	FREE(kth, M_TEMP);
	95	}
	96
c4ec2128 KM	97	ktrnamei(vp, path)
c4ec2128 KM	98	struct vnode *vp;
2d68027d MT	99	char *path;
	100	{
	101	struct ktr_header *kth = ktrgetheader(KTR_NAMEI);
	102
f73d8bd6	103	if (kth == NULL)
2d68027d	104	return;
2d68027d MT	105	kth->ktr_len = strlen(path);
	106	kth->ktr_buf = path;
	107
c4ec2128	108	ktrwrite(vp, kth);
2d68027d MT	109	FREE(kth, M_TEMP);
	110	}
	111
c4ec2128 KM	112	ktrgenio(vp, fd, rw, iov, len)
c4ec2128 KM	113	struct vnode *vp;
f73d8bd6 MT	114	enum uio_rw rw;
	115	register struct iovec *iov;
	116	{
	117	struct ktr_header *kth = ktrgetheader(KTR_GENIO);
	118	register struct ktr_genio *ktp;
	119	register caddr_t cp;
	120	register int resid = len, cnt;
	121
	122	if (kth == NULL \|\| u.u_error)
	123	return;
	124	MALLOC(ktp, struct ktr_genio *, sizeof(struct ktr_genio) + len,
	125	M_TEMP, M_WAITOK);
f73d8bd6 MT	126	ktp->ktr_fd = fd;
	127	ktp->ktr_rw = rw;
	128	cp = (caddr_t)((char *)ktp + sizeof (struct ktr_genio));
	129	while (resid > 0) {
	130	if ((cnt = iov->iov_len) > resid)
	131	cnt = resid;
	132	if (copyin(iov->iov_base, cp, cnt))
	133	goto done;
	134	cp += cnt;
	135	resid -= cnt;
	136	iov++;
	137	}
	138	kth->ktr_buf = (caddr_t)ktp;
	139	kth->ktr_len = sizeof (struct ktr_genio) + len;
	140
c4ec2128	141	ktrwrite(vp, kth);
f73d8bd6 MT	142	done:
	143	FREE(kth, M_TEMP);
	144	FREE(ktp, M_TEMP);
	145	}
	146
2d68027d MT	147	/*
	148	* ktrace system call
	149	*/
	150	ktrace()
	151	{
2d68027d MT	152	register struct a {
	153	char *fname;
	154	int ops;
	155	int facs;
f73d8bd6	156	int pid;
2d68027d	157	} uap = (struct a )u.u_ap;
c4ec2128	158	register struct vnode *vp = NULL;
2d68027d MT	159	register struct nameidata *ndp = &u.u_nd;
	160	register struct proc *p;
	161	struct pgrp *pg;
	162	register int ops = uap->ops&0x3;
	163	register int facs = uap->facs;
f73d8bd6	164	register int ret = 0;
2d68027d MT	165
	166	/*
	167	* Until security implications are thought through,
f73d8bd6	168	* limit tracing to root (unless ktrace_nocheck is set).
2d68027d	169	*/
849cbd39	170	if (!ktrace_nocheck && (u.u_error = suser(u.u_cred, &u.u_acflag)))
2d68027d	171	return;
2d68027d MT	172	if (ops != KTROP_CLEAR) {
	173	/*
	174	* an operation which requires a file argument.
	175	*/
2d68027d MT	176	ndp->ni_segflg = UIO_USERSPACE;
2d68027d MT	177	ndp->ni_dirp = uap->fname;
c4ec2128	178	if (u.u_error = vn_open(ndp, FREAD\|FWRITE, 0))
2d68027d	179	return;
c4ec2128 KM	180	vp = ndp->ni_vp;
c4ec2128 KM	181	if (vp->v_type != VREG) {
2d68027d	182	u.u_error = EACCES;
c4ec2128	183	vrele(vp);
2d68027d MT	184	return;
2d68027d MT	185	}
2d68027d MT	186	}
	187	/*
	188	* Clear all uses of the tracefile
	189	*/
	190	if (ops == KTROP_CLEARFILE) {
	191	for (p = allproc; p != NULL; p = p->p_nxt) {
c4ec2128	192	if (p->p_tracep == vp) {
2d68027d MT	193	p->p_flag &= ~SKTR;
	194	p->p_tracep = NULL;
	195	p->p_traceflag = 0;
c4ec2128	196	vrele(vp);
2d68027d MT	197	}
	198	}
	199	goto done;
	200	}
	201
	202	/*
	203	* need something to (un)trace
	204	*/
	205	if (!facs) {
	206	u.u_error = EINVAL;
	207	goto done;
	208	}
	209
	210	if (uap->pid < 0) {
	211	pg = pgfind(-uap->pid);
	212	if (pg == NULL) {
	213	u.u_error = ESRCH;
	214	goto done;
	215	}
	216	for (p = pg->pg_mem; p != NULL; p = p->p_pgrpnxt)
	217	if (uap->ops&KTROP_INHERITFLAG)
c4ec2128	218	ret \|= ktrsetchildren(p, ops, facs, vp);
2d68027d	219	else
c4ec2128	220	ret \|= ktrops(p, ops, facs, vp);
2d68027d MT	221
	222	} else {
	223	p = pfind(uap->pid);
	224	if (p == NULL) {
	225	u.u_error = ESRCH;
	226	goto done;
	227	}
	228	if (uap->ops&KTROP_INHERITFLAG)
c4ec2128	229	ret \|= ktrsetchildren(p, ops, facs, vp);
2d68027d	230	else
c4ec2128	231	ret \|= ktrops(p, ops, facs, vp);
2d68027d	232	}
f73d8bd6 MT	233	if (!ret)
f73d8bd6 MT	234	u.u_error = EPERM;
2d68027d	235	done:
c4ec2128 KM	236	if (vp != NULL)
c4ec2128 KM	237	vrele(vp);
2d68027d MT	238	}
2d68027d MT	239
c4ec2128	240	ktrops(p, ops, facs, vp)
2d68027d	241	struct proc *p;
c4ec2128	242	struct vnode *vp;
2d68027d	243	{
f73d8bd6 MT	244
	245	if (u.u_uid && u.u_uid != p->p_uid)
	246	return 0;
2d68027d	247	if (ops == KTROP_SET) {
c4ec2128	248	if (p->p_tracep != vp) {
2d68027d MT	249	/*
	250	* if trace file already in use, relinquish
	251	*/
	252	if (p->p_tracep != NULL)
c4ec2128 KM	253	vrele(p->p_tracep);
	254	if (vp->v_count == 0)
	255	panic("ktrace: bad vnode");
	256	p->p_tracep = vp;
2d68027d MT	257	}
	258	p->p_traceflag \|= facs;
	259	} else {
	260	/* KTROP_CLEAR */
	261	if ((p->p_traceflag &= ~facs) == 0) {
	262	if (p->p_tracep != NULL) {
c4ec2128	263	vrele(p->p_tracep);
2d68027d MT	264	p->p_tracep = NULL;
2d68027d MT	265	}
f73d8bd6	266	p->p_flag &= ~SKTR;
2d68027d MT	267	}
2d68027d MT	268	}
f73d8bd6 MT	269
f73d8bd6 MT	270	return 1;
2d68027d	271	}
f73d8bd6	272
c4ec2128	273	ktrsetchildren(top, ops, facs, vp)
2d68027d	274	struct proc *top;
c4ec2128	275	struct vnode *vp;
2d68027d MT	276	{
	277	register struct proc *p;
	278	register int ndx;
f73d8bd6	279	register int ret = 0;
2d68027d MT	280
	281	p = top;
	282	for (;;) {
c4ec2128	283	if ((ret \|= ktrops(p, ops, facs, vp)) && ops == KTROP_SET)
2d68027d	284	p->p_flag \|= SKTR;
2d68027d MT	285	/*
	286	* If this process has children, descend to them next,
	287	* otherwise do any siblings, and if done with this level,
	288	* follow back up the tree (but not past top).
	289	*/
	290	if (p->p_cptr)
	291	p = p->p_cptr;
	292	else if (p == top)
f73d8bd6	293	return ret;
2d68027d MT	294	else if (p->p_osptr)
	295	p = p->p_osptr;
	296	else for (;;) {
	297	p = p->p_pptr;
	298	if (p == top)
f73d8bd6	299	return ret;
2d68027d MT	300	if (p->p_osptr) {
	301	p = p->p_osptr;
	302	break;
	303	}
	304	}
	305	}
f73d8bd6	306	/NOTREACHED/
2d68027d MT	307	}
2d68027d MT	308
c4ec2128 KM	309	ktrwrite(vp, kth)
	310	struct vnode *vp;
	311	register struct ktr_header *kth;
2d68027d	312	{
c4ec2128 KM	313	struct uio auio;
	314	struct iovec aiov[2];
	315	int offset, error;
	316
	317	if (vp == NULL)
f73d8bd6	318	return;
c4ec2128 KM	319	auio.uio_iov = &aiov[0];
	320	auio.uio_offset = 0;
	321	auio.uio_segflg = UIO_SYSSPACE;
	322	auio.uio_rw = UIO_WRITE;
	323	aiov[0].iov_base = (caddr_t)kth;
	324	aiov[0].iov_len = sizeof(struct ktr_header);
	325	auio.uio_resid = sizeof(struct ktr_header);
	326	auio.uio_iovcnt = 1;
2d68027d	327	if (kth->ktr_len > 0) {
c4ec2128 KM	328	auio.uio_iovcnt++;
	329	aiov[1].iov_base = kth->ktr_buf;
	330	aiov[1].iov_len = kth->ktr_len;
	331	auio.uio_resid += kth->ktr_len;
2d68027d	332	}
c4ec2128	333	error = VOP_WRITE(vp, &auio, &offset, IO_UNIT\|IO_APPEND, u.u_cred);
2d68027d	334	}
2d68027d	335	#endif