1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1994 SigmaSoft, Th. Lockert <[email protected]>
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 <[email protected]>
31 */
32
33 #include <sys/cdefs.h>
34 #include <sys/types.h>
35 #include <sys/sysctl.h>
36 #define _WANT_SYSVMSG_INTERNALS
37 #include <sys/msg.h>
38 #define _WANT_SYSVSEM_INTERNALS
39 #include <sys/sem.h>
40 #define _WANT_SYSVSHM_INTERNALS
41 #include <sys/shm.h>
42
43 #include <assert.h>
44 #include <err.h>
45 #include <kvm.h>
46 #include <nlist.h>
47 #include <stddef.h>
48
49 #include "ipc.h"
50
51 int use_sysctl = 1;
52 struct semid_kernel *sema;
53 struct seminfo seminfo;
54 struct msginfo msginfo;
55 struct msqid_kernel *msqids;
56 struct shminfo shminfo;
57 struct shmid_kernel *shmsegs;
58
59 struct nlist symbols[] = {
60 { .n_name = "sema" },
61 { .n_name = "seminfo" },
62 { .n_name = "msginfo" },
63 { .n_name = "msqids" },
64 { .n_name = "shminfo" },
65 { .n_name = "shmsegs" },
66 { .n_name = NULL }
67 };
68
69 #define SHMINFO_XVEC X(shmmax, sizeof(u_long)) \
70 X(shmmin, sizeof(u_long)) \
71 X(shmmni, sizeof(u_long)) \
72 X(shmseg, sizeof(u_long)) \
73 X(shmall, sizeof(u_long))
74
75 #define SEMINFO_XVEC X(semmni, sizeof(int)) \
76 X(semmns, sizeof(int)) \
77 X(semmnu, sizeof(int)) \
78 X(semmsl, sizeof(int)) \
79 X(semopm, sizeof(int)) \
80 X(semume, sizeof(int)) \
81 X(semusz, sizeof(int)) \
82 X(semvmx, sizeof(int)) \
83 X(semaem, sizeof(int))
84
85 #define MSGINFO_XVEC X(msgmax, sizeof(int)) \
86 X(msgmni, sizeof(int)) \
87 X(msgmnb, sizeof(int)) \
88 X(msgtql, sizeof(int)) \
89 X(msgssz, sizeof(int)) \
90 X(msgseg, sizeof(int))
91
92 #define X(a, b) { "kern.ipc." #a, offsetof(TYPEC, a), (b) },
93 #define TYPEC struct shminfo
94 static struct scgs_vector shminfo_scgsv[] = { SHMINFO_XVEC { .sysctl=NULL } };
95 #undef TYPEC
96 #define TYPEC struct seminfo
97 static struct scgs_vector seminfo_scgsv[] = { SEMINFO_XVEC { .sysctl=NULL } };
98 #undef TYPEC
99 #define TYPEC struct msginfo
100 static struct scgs_vector msginfo_scgsv[] = { MSGINFO_XVEC { .sysctl=NULL } };
101 #undef TYPEC
102 #undef X
103
104 kvm_t *kd;
105
106 void
sysctlgatherstruct(void * addr,size_t size,struct scgs_vector * vecarr)107 sysctlgatherstruct(void *addr, size_t size, struct scgs_vector *vecarr)
108 {
109 struct scgs_vector *xp;
110 size_t tsiz;
111 int rv;
112
113 for (xp = vecarr; xp->sysctl != NULL; xp++) {
114 assert(xp->offset <= size);
115 tsiz = xp->size;
116 rv = sysctlbyname(xp->sysctl, (char *)addr + xp->offset,
117 &tsiz, NULL, 0);
118 if (rv == -1)
119 err(1, "sysctlbyname: %s", xp->sysctl);
120 if (tsiz != xp->size)
121 errx(1, "%s size mismatch (expected %zu, got %zu)",
122 xp->sysctl, xp->size, tsiz);
123 }
124 }
125
126 void
kget(int idx,void * addr,size_t size)127 kget(int idx, void *addr, size_t size)
128 {
129 const char *symn; /* symbol name */
130 size_t tsiz;
131 int rv;
132 unsigned long kaddr;
133 const char *sym2sysctl[] = { /* symbol to sysctl name table */
134 "kern.ipc.sema",
135 "kern.ipc.seminfo",
136 "kern.ipc.msginfo",
137 "kern.ipc.msqids",
138 "kern.ipc.shminfo",
139 "kern.ipc.shmsegs" };
140
141 assert((unsigned)idx <= sizeof(sym2sysctl) / sizeof(*sym2sysctl));
142 if (!use_sysctl) {
143 symn = symbols[idx].n_name;
144 if (*symn == '_')
145 symn++;
146 if (symbols[idx].n_type == 0 || symbols[idx].n_value == 0)
147 errx(1, "symbol %s undefined", symn);
148 /*
149 * For some symbols, the value we retrieve is
150 * actually a pointer; since we want the actual value,
151 * we have to manually dereference it.
152 */
153 switch (idx) {
154 case X_MSQIDS:
155 tsiz = sizeof(msqids);
156 rv = kvm_read(kd, symbols[idx].n_value,
157 &msqids, tsiz);
158 kaddr = (u_long)msqids;
159 break;
160 case X_SHMSEGS:
161 tsiz = sizeof(shmsegs);
162 rv = kvm_read(kd, symbols[idx].n_value,
163 &shmsegs, tsiz);
164 kaddr = (u_long)shmsegs;
165 break;
166 case X_SEMA:
167 tsiz = sizeof(sema);
168 rv = kvm_read(kd, symbols[idx].n_value,
169 &sema, tsiz);
170 kaddr = (u_long)sema;
171 break;
172 default:
173 rv = tsiz = 0;
174 kaddr = symbols[idx].n_value;
175 break;
176 }
177 if ((unsigned)rv != tsiz)
178 errx(1, "%s: %s", symn, kvm_geterr(kd));
179 if ((unsigned)kvm_read(kd, kaddr, addr, size) != size)
180 errx(1, "%s: %s", symn, kvm_geterr(kd));
181 } else {
182 switch (idx) {
183 case X_SHMINFO:
184 sysctlgatherstruct(addr, size, shminfo_scgsv);
185 break;
186 case X_SEMINFO:
187 sysctlgatherstruct(addr, size, seminfo_scgsv);
188 break;
189 case X_MSGINFO:
190 sysctlgatherstruct(addr, size, msginfo_scgsv);
191 break;
192 default:
193 tsiz = size;
194 rv = sysctlbyname(sym2sysctl[idx], addr, &tsiz,
195 NULL, 0);
196 if (rv == -1)
197 err(1, "sysctlbyname: %s", sym2sysctl[idx]);
198 if (tsiz != size)
199 errx(1, "%s size mismatch "
200 "(expected %zu, got %zu)",
201 sym2sysctl[idx], size, tsiz);
202 break;
203 }
204 }
205 }
206