1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * The split of ipcs.c into ipcs.c and ipc.c to accommodate the
30 * changes in ipcrm.c was done by Edwin Groothuis <edwin@FreeBSD.org>
31 */
32
33 #include <sys/types.h>
34 #include <sys/sysctl.h>
35 #define _WANT_SYSVMSG_INTERNALS
36 #include <sys/msg.h>
37 #define _WANT_SYSVSEM_INTERNALS
38 #include <sys/sem.h>
39 #define _WANT_SYSVSHM_INTERNALS
40 #include <sys/shm.h>
41
42 #include <assert.h>
43 #include <err.h>
44 #include <kvm.h>
45 #include <nlist.h>
46 #include <stddef.h>
47
48 #include "ipc.h"
49
50 int use_sysctl = 1;
51 struct semid_kernel *sema;
52 struct seminfo seminfo;
53 struct msginfo msginfo;
54 struct msqid_kernel *msqids;
55 struct shminfo shminfo;
56 struct shmid_kernel *shmsegs;
57
58 struct nlist symbols[] = {
59 { .n_name = "sema" },
60 { .n_name = "seminfo" },
61 { .n_name = "msginfo" },
62 { .n_name = "msqids" },
63 { .n_name = "shminfo" },
64 { .n_name = "shmsegs" },
65 { .n_name = NULL }
66 };
67
68 #define SHMINFO_XVEC X(shmmax, sizeof(u_long)) \
69 X(shmmin, sizeof(u_long)) \
70 X(shmmni, sizeof(u_long)) \
71 X(shmseg, sizeof(u_long)) \
72 X(shmall, sizeof(u_long))
73
74 #define SEMINFO_XVEC X(semmni, sizeof(int)) \
75 X(semmns, sizeof(int)) \
76 X(semmnu, sizeof(int)) \
77 X(semmsl, sizeof(int)) \
78 X(semopm, sizeof(int)) \
79 X(semume, sizeof(int)) \
80 X(semusz, sizeof(int)) \
81 X(semvmx, sizeof(int)) \
82 X(semaem, sizeof(int))
83
84 #define MSGINFO_XVEC X(msgmax, sizeof(int)) \
85 X(msgmni, sizeof(int)) \
86 X(msgmnb, sizeof(int)) \
87 X(msgtql, sizeof(int)) \
88 X(msgssz, sizeof(int)) \
89 X(msgseg, sizeof(int))
90
91 #define X(a, b) { "kern.ipc." #a, offsetof(TYPEC, a), (b) },
92 #define TYPEC struct shminfo
93 static struct scgs_vector shminfo_scgsv[] = { SHMINFO_XVEC { .sysctl=NULL } };
94 #undef TYPEC
95 #define TYPEC struct seminfo
96 static struct scgs_vector seminfo_scgsv[] = { SEMINFO_XVEC { .sysctl=NULL } };
97 #undef TYPEC
98 #define TYPEC struct msginfo
99 static struct scgs_vector msginfo_scgsv[] = { MSGINFO_XVEC { .sysctl=NULL } };
100 #undef TYPEC
101 #undef X
102
103 kvm_t *kd;
104
105 void
sysctlgatherstruct(void * addr,size_t size,struct scgs_vector * vecarr)106 sysctlgatherstruct(void *addr, size_t size, struct scgs_vector *vecarr)
107 {
108 struct scgs_vector *xp;
109 size_t tsiz;
110 int rv;
111
112 for (xp = vecarr; xp->sysctl != NULL; xp++) {
113 assert(xp->offset <= size);
114 tsiz = xp->size;
115 rv = sysctlbyname(xp->sysctl, (char *)addr + xp->offset,
116 &tsiz, NULL, 0);
117 if (rv == -1)
118 err(1, "sysctlbyname: %s", xp->sysctl);
119 if (tsiz != xp->size)
120 errx(1, "%s size mismatch (expected %zu, got %zu)",
121 xp->sysctl, xp->size, tsiz);
122 }
123 }
124
125 void
kget(int idx,void * addr,size_t size)126 kget(int idx, void *addr, size_t size)
127 {
128 const char *symn; /* symbol name */
129 size_t tsiz;
130 int rv;
131 unsigned long kaddr;
132 const char *sym2sysctl[] = { /* symbol to sysctl name table */
133 "kern.ipc.sema",
134 "kern.ipc.seminfo",
135 "kern.ipc.msginfo",
136 "kern.ipc.msqids",
137 "kern.ipc.shminfo",
138 "kern.ipc.shmsegs" };
139
140 assert((unsigned)idx <= sizeof(sym2sysctl) / sizeof(*sym2sysctl));
141 if (!use_sysctl) {
142 symn = symbols[idx].n_name;
143 if (*symn == '_')
144 symn++;
145 if (symbols[idx].n_type == 0 || symbols[idx].n_value == 0)
146 errx(1, "symbol %s undefined", symn);
147 /*
148 * For some symbols, the value we retrieve is
149 * actually a pointer; since we want the actual value,
150 * we have to manually dereference it.
151 */
152 switch (idx) {
153 case X_MSQIDS:
154 tsiz = sizeof(msqids);
155 rv = kvm_read(kd, symbols[idx].n_value,
156 &msqids, tsiz);
157 kaddr = (u_long)msqids;
158 break;
159 case X_SHMSEGS:
160 tsiz = sizeof(shmsegs);
161 rv = kvm_read(kd, symbols[idx].n_value,
162 &shmsegs, tsiz);
163 kaddr = (u_long)shmsegs;
164 break;
165 case X_SEMA:
166 tsiz = sizeof(sema);
167 rv = kvm_read(kd, symbols[idx].n_value,
168 &sema, tsiz);
169 kaddr = (u_long)sema;
170 break;
171 default:
172 rv = tsiz = 0;
173 kaddr = symbols[idx].n_value;
174 break;
175 }
176 if ((unsigned)rv != tsiz)
177 errx(1, "%s: %s", symn, kvm_geterr(kd));
178 if ((unsigned)kvm_read(kd, kaddr, addr, size) != size)
179 errx(1, "%s: %s", symn, kvm_geterr(kd));
180 } else {
181 switch (idx) {
182 case X_SHMINFO:
183 sysctlgatherstruct(addr, size, shminfo_scgsv);
184 break;
185 case X_SEMINFO:
186 sysctlgatherstruct(addr, size, seminfo_scgsv);
187 break;
188 case X_MSGINFO:
189 sysctlgatherstruct(addr, size, msginfo_scgsv);
190 break;
191 default:
192 tsiz = size;
193 rv = sysctlbyname(sym2sysctl[idx], addr, &tsiz,
194 NULL, 0);
195 if (rv == -1)
196 err(1, "sysctlbyname: %s", sym2sysctl[idx]);
197 if (tsiz != size)
198 errx(1, "%s size mismatch "
199 "(expected %zu, got %zu)",
200 sym2sysctl[idx], size, tsiz);
201 break;
202 }
203 }
204 }
205