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misc.c revision 1.20.2.1 
      1 /*	$NetBSD: misc.c,v 1.20.2.1 2019/06/10 22:10:19 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __RCSID("$NetBSD: misc.c,v 1.20.2.1 2019/06/10 22:10:19 christos Exp $");
     34 
     35 #include <stdbool.h>
     36 #include <sys/param.h>
     37 #include <sys/types.h>
     38 #include <sys/time.h>
     39 #include <sys/stat.h>
     40 #include <sys/condvar.h>
     41 #include <sys/selinfo.h>
     42 #include <sys/filedesc.h>
     43 #define _KERNEL
     44 #include <sys/mqueue.h>
     45 #include <sys/eventvar.h>
     46 #undef _KERNEL
     47 #include <sys/proc.h>
     48 #define _KERNEL
     49 #include <sys/file.h>
     50 #define copyin_t int
     51 #define copyout_t int
     52 #include <sys/ksem.h>
     53 #define _LIB_LIBKERN_LIBKERN_H_
     54 #define mutex_enter(a)
     55 #define mutex_exit(a)
     56 #undef _KERNEL
     57 #include <sys/cprng.h>
     58 #include <sys/vnode.h>
     59 #include <sys/mount.h>
     60 
     61 #include <net/bpfdesc.h>
     62 
     63 #include <err.h>
     64 #include <util.h>
     65 #include <string.h>
     66 #include <kvm.h>
     67 #include "fstat.h"
     68 
     69 static struct nlist nl[] = {
     70 #define NL_BPF		0
     71     { .n_name = "bpf_fileops", },
     72 #define NL_CRYPTO	1
     73     { .n_name = "cryptofops" },
     74 #define NL_DMIO		2
     75     { .n_name = "dmio_fileops", },
     76 #define NL_DRVCTL	3
     77     { .n_name = "drvctl_fileops", },
     78 #define NL_DTV_DEMUX	4
     79     { .n_name = "dtv_demux_fileops", },
     80 #define NL_FILEMON	5
     81     { .n_name = "filemon_fileops", },
     82 #define NL_KQUEUE	6
     83     { .n_name = "kqueueops" },
     84 #define NL_MQUEUE	7
     85     { .n_name = "mqops" },
     86 #define NL_PIPE		8
     87     { .n_name = "pipeops" },
     88 #define NL_PUTTER	9
     89     { .n_name = "putter_fileops", },
     90 #define NL_RND		10
     91     { .n_name = "rnd_fileops", },
     92 #define NL_SEM		11
     93     { .n_name = "semops", },
     94 #define NL_SOCKET	12
     95     { .n_name = "socketops" },
     96 #define NL_SVR4_NET	13
     97     { .n_name = "svr4_netops" },
     98 #define NL_SVR4_32_NET	14
     99     { .n_name = "svr4_32_netops" },
    100 #define NL_TAP		15
    101     { .n_name = "tap_fileops", },
    102 #define NL_VNOPS	16
    103     { .n_name = "vnops" },
    104 #define NL_XENEVT	17
    105     { .n_name = "xenevt_fileops" },
    106 #define NL_AUDIO	18
    107     { .n_name = "audio_fileops" },
    108 #define NL_PAD		19
    109     { .n_name = "pad_fileops" },
    110 #define NL_MAX		20
    111     { .n_name = NULL }
    112 };
    113 
    114 extern int vflg;
    115 
    116 
    117 static int
    118 p_bpf(struct file *f)
    119 {
    120 	struct bpf_d bpf;
    121 	struct bpf_if bi;
    122 	struct ifnet ifn;
    123 
    124 	strlcpy(ifn.if_xname, "???", sizeof(ifn.if_xname));
    125 
    126 	if (!KVM_READ(f->f_data, &bpf, sizeof(bpf))) {
    127 		dprintf("can't read bpf at %p for pid %d", f->f_data, Pid);
    128 		return 0;
    129 	}
    130 	if (bpf.bd_bif != NULL) {
    131 		if (!KVM_READ(bpf.bd_bif, &bi, sizeof(bi)))
    132 			dprintf("can't read bpf interface at %p for pid %d",
    133 			    bpf.bd_bif, Pid);
    134 		if (bi.bif_ifp != NULL)
    135 			if (!KVM_READ(bi.bif_ifp, &ifn, sizeof(ifn)))
    136 				dprintf("can't read net interfsace"
    137 				    " at %p for pid %d", bi.bif_ifp, Pid);
    138 	}
    139 	(void)printf("* bpf@%s rec=%lu, dr=%lu, cap=%lu, pid=%lu", ifn.if_xname,
    140 	    bpf.bd_rcount, bpf.bd_dcount, bpf.bd_ccount,
    141 	    (unsigned long)bpf.bd_pid);
    142 	if (bpf.bd_promisc)
    143 		(void)printf(", promisc");
    144 	if (bpf.bd_immediate)
    145 		(void)printf(", immed");
    146 	if (bpf.bd_direction == BPF_D_IN)
    147 		(void)printf(", in");
    148 	else if (bpf.bd_direction == BPF_D_INOUT)
    149 		(void)printf(", inout");
    150 	else if (bpf.bd_direction == BPF_D_OUT)
    151 		(void)printf(", out");
    152 	if (bpf.bd_jitcode != NULL)
    153 		(void)printf(", jit");
    154 	if (bpf.bd_async)
    155 		(void)printf(", asyncgrp=%lu", (unsigned long)bpf.bd_pgid);
    156 	if (bpf.bd_state == BPF_IDLE)
    157 		(void)printf(", idle");
    158 	else if (bpf.bd_state == BPF_WAITING)
    159 		(void)printf(", waiting");
    160 	else if (bpf.bd_state == BPF_TIMED_OUT)
    161 		(void)printf(", timeout");
    162 	(void)printf("\n");
    163 	return 0;
    164 }
    165 
    166 static int
    167 p_sem(struct file *f)
    168 {
    169 	ksem_t ks;
    170 	if (!KVM_READ(f->f_data, &ks, sizeof(ks))) {
    171 		dprintf("can't read sem at %p for pid %d", f->f_data, Pid);
    172 		return 0;
    173 	}
    174 	(void)printf("* ksem ref=%u, value=%u, waiters=%u, flags=0x%x, "
    175 	    "mode=%o, uid=%u, gid=%u", ks.ks_ref, ks.ks_value, ks.ks_waiters,
    176 	    ks.ks_flags, ks.ks_mode, ks.ks_uid, ks.ks_gid);
    177 	if (ks.ks_name && ks.ks_namelen) {
    178 		char buf[64];
    179 		if (ks.ks_namelen >= sizeof(buf))
    180 			ks.ks_namelen = sizeof(buf) - 1;
    181 		if (!KVM_READ(ks.ks_name, buf, ks.ks_namelen)) {
    182 			dprintf("can't read sem name at %p for pid %d",
    183 			    ks.ks_name, Pid);
    184 		} else {
    185 			buf[ks.ks_namelen] = '\0';
    186 			(void)printf(", name=%s\n", buf);
    187 			return 0;
    188 		}
    189 	}
    190 	(void)printf("\n");
    191 	return 0;
    192 }
    193 
    194 static int
    195 p_mqueue(struct file *f)
    196 {
    197 	struct mqueue mq;
    198 
    199 	if (!KVM_READ(f->f_data, &mq, sizeof(mq))) {
    200 		dprintf("can't read mqueue at %p for pid %d", f->f_data, Pid);
    201 		return 0;
    202 	}
    203 	(void)printf("* mqueue \"%s\"\n", mq.mq_name);
    204 	return 0;
    205 }
    206 
    207 static int
    208 p_rnd(struct file *f)
    209 {
    210 	struct cprng_strong {
    211 		char cs_name[16];
    212 		int  cs_flags;
    213 		/*...*/
    214 	} str;
    215 	struct rnd_ctx {
    216 		struct cprng_strong *rc_cprng;
    217 		bool rc_hard;
    218 	} ctx;
    219 	char buf[1024];
    220 
    221 	if (!KVM_READ(f->f_data, &ctx, sizeof(ctx))) {
    222 		dprintf("can't read rnd_ctx at %p for pid %d", f->f_data, Pid);
    223 		return 0;
    224 	}
    225 	if (!KVM_READ(ctx.rc_cprng, &str, sizeof(str))) {
    226 		dprintf("can't read cprng_strong at %p for pid %d", f->f_data,\
    227 		    Pid);
    228 		return 0;
    229 	}
    230 	snprintb(buf, sizeof(buf), CPRNG_FMT, str.cs_flags);
    231 	(void)printf("* rnd \"%s\" flags %s\n", str.cs_name, buf);
    232 	return 0;
    233 }
    234 
    235 static int
    236 p_kqueue(struct file *f)
    237 {
    238 	struct kqueue kq;
    239 
    240 	if (!KVM_READ(f->f_data, &kq, sizeof(kq))) {
    241 		dprintf("can't read kqueue at %p for pid %d", f->f_data, Pid);
    242 		return 0;
    243 	}
    244 	(void)printf("* kqueue pending %d\n", kq.kq_count);
    245 	return 0;
    246 }
    247 
    248 int
    249 pmisc(struct file *f, const char *name)
    250 {
    251 	size_t i;
    252 	if (nl[0].n_value == 0) {
    253 		int n;
    254 		if ((n = KVM_NLIST(nl)) == -1)
    255 			errx(1, "Cannot list kernel symbols (%s)",
    256 			    KVM_GETERR());
    257 		else if (n != 0 && vflg) {
    258 			char buf[1024];
    259 			buf[0] = '\0';
    260 			for (struct nlist *l = nl; l->n_name != NULL; l++) {
    261 				if (l->n_value != 0)
    262 					continue;
    263 				strlcat(buf, ", ", sizeof(buf));
    264 				strlcat(buf, l->n_name, sizeof(buf));
    265 			}
    266 			warnx("Could not find %d symbols: %s", n, buf + 2);
    267 		}
    268 	}
    269 	for (i = 0; i < NL_MAX; i++)
    270 		if ((uintptr_t)f->f_ops == nl[i].n_value)
    271 			break;
    272 	switch (i) {
    273 	case NL_BPF:
    274 		return p_bpf(f);
    275 	case NL_MQUEUE:
    276 		return p_mqueue(f);
    277 	case NL_KQUEUE:
    278 		return p_kqueue(f);
    279 	case NL_RND:
    280 		return p_rnd(f);
    281 	case NL_SEM:
    282 		return p_sem(f);
    283 	case NL_TAP:
    284 		printf("* tap %lu\n", (unsigned long)(intptr_t)f->f_data);
    285 		return 0;
    286 	case NL_CRYPTO:
    287 		printf("* crypto %p\n", f->f_data);
    288 		return 0;
    289 	case NL_AUDIO:
    290 		printf("* audio %p\n", f->f_data);
    291 		return 0;
    292 	case NL_PAD:
    293 		printf("* pad %p\n", f->f_data);
    294 		return 0;
    295 	case NL_MAX:
    296 		printf("* %s ops=%p %p\n", name, f->f_ops, f->f_data);
    297 		return 0;
    298 	default:
    299 		printf("* %s %p\n", nl[i].n_name, f->f_data);
    300 		return 0;
    301 	}
    302 }
    303