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freebsd-nq/usr.bin/ipcs/ipcs.c
Christian S.J. Peron 701fabc74b If sysctlbyname fails for kernel related reasons, tag the errno 
string to the end of the error message. I think we used errx()
there when we really wanted an err().

MFC after:	1 week
2005-05-24 23:42:09 +00:00

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/*
* Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com>
* 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 ``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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <assert.h>
#include <err.h>
#include <fcntl.h>
#include <grp.h>
#include <kvm.h>
#include <nlist.h>
#include <limits.h>
#include <paths.h>
#include <pwd.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#define _KERNEL
#include <sys/ipc.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <sys/msg.h>
/* SysCtlGatherStruct structure. */
struct scgs_vector {
const char *sysctl;
off_t offset;
size_t size;
};
int use_sysctl = 1;
struct semid_kernel *sema;
struct seminfo seminfo;
struct msginfo msginfo;
struct msqid_kernel *msqids;
struct shminfo shminfo;
struct shmid_kernel *shmsegs;
char *fmt_perm(u_short);
void cvt_time(time_t, char *);
void sysctlgatherstruct(void *addr, size_t size, struct scgs_vector *vec);
void kget(int idx, void *addr, size_t size);
void usage(void);
uid_t user2uid(char *username);
static struct nlist symbols[] = {
{"sema"},
#define X_SEMA 0
{"seminfo"},
#define X_SEMINFO 1
{"msginfo"},
#define X_MSGINFO 2
{"msqids"},
#define X_MSQIDS 3
{"shminfo"},
#define X_SHMINFO 4
{"shmsegs"},
#define X_SHMSEGS 5
{NULL}
};
#define SHMINFO_XVEC \
X(shmmax, sizeof(int)) \
X(shmmin, sizeof(int)) \
X(shmmni, sizeof(int)) \
X(shmseg, sizeof(int)) \
X(shmall, sizeof(int))
#define SEMINFO_XVEC \
X(semmap, sizeof(int)) \
X(semmni, sizeof(int)) \
X(semmns, sizeof(int)) \
X(semmnu, sizeof(int)) \
X(semmsl, sizeof(int)) \
X(semopm, sizeof(int)) \
X(semume, sizeof(int)) \
X(semusz, sizeof(int)) \
X(semvmx, sizeof(int)) \
X(semaem, sizeof(int))
#define MSGINFO_XVEC \
X(msgmax, sizeof(int)) \
X(msgmni, sizeof(int)) \
X(msgmnb, sizeof(int)) \
X(msgtql, sizeof(int)) \
X(msgssz, sizeof(int)) \
X(msgseg, sizeof(int))
#define X(a, b) { "kern.ipc." #a, offsetof(TYPEC, a), (b) },
#define TYPEC struct shminfo
struct scgs_vector shminfo_scgsv[] = { SHMINFO_XVEC { NULL } };
#undef TYPEC
#define TYPEC struct seminfo
struct scgs_vector seminfo_scgsv[] = { SEMINFO_XVEC { NULL } };
#undef TYPEC
#define TYPEC struct msginfo
struct scgs_vector msginfo_scgsv[] = { MSGINFO_XVEC { NULL } };
#undef TYPEC
#undef X
static kvm_t *kd;
char *
fmt_perm(u_short mode)
{
static char buffer[100];
buffer[0] = '-';
buffer[1] = '-';
buffer[2] = ((mode & 0400) ? 'r' : '-');
buffer[3] = ((mode & 0200) ? 'w' : '-');
buffer[4] = ((mode & 0100) ? 'a' : '-');
buffer[5] = ((mode & 0040) ? 'r' : '-');
buffer[6] = ((mode & 0020) ? 'w' : '-');
buffer[7] = ((mode & 0010) ? 'a' : '-');
buffer[8] = ((mode & 0004) ? 'r' : '-');
buffer[9] = ((mode & 0002) ? 'w' : '-');
buffer[10] = ((mode & 0001) ? 'a' : '-');
buffer[11] = '\0';
return (&buffer[0]);
}
void
cvt_time(time_t t, char *buf)
{
struct tm *tm;
if (t == 0) {
strcpy(buf, "no-entry");
} else {
tm = localtime(&t);
sprintf(buf, "%2d:%02d:%02d",
tm->tm_hour, tm->tm_min, tm->tm_sec);
}
}
#define SHMINFO 1
#define SHMTOTAL 2
#define MSGINFO 4
#define MSGTOTAL 8
#define SEMINFO 16
#define SEMTOTAL 32
#define BIGGEST 1
#define CREATOR 2
#define OUTSTANDING 4
#define PID 8
#define TIME 16
int
main(int argc, char *argv[])
{
int display = SHMINFO | MSGINFO | SEMINFO;
int option = 0;
char *core = NULL, *user = NULL, *namelist = NULL;
char kvmoferr[_POSIX2_LINE_MAX]; /* Error buf for kvm_openfiles. */
int i;
uid_t uid;
while ((i = getopt(argc, argv, "MmQqSsabC:cN:optTu:y")) != -1)
switch (i) {
case 'M':
display = SHMTOTAL;
break;
case 'm':
display = SHMINFO;
break;
case 'Q':
display = MSGTOTAL;
break;
case 'q':
display = MSGINFO;
break;
case 'S':
display = SEMTOTAL;
break;
case 's':
display = SEMINFO;
break;
case 'T':
display = SHMTOTAL | MSGTOTAL | SEMTOTAL;
break;
case 'a':
option |= BIGGEST | CREATOR | OUTSTANDING | PID | TIME;
break;
case 'b':
option |= BIGGEST;
break;
case 'C':
core = optarg;
break;
case 'c':
option |= CREATOR;
break;
case 'N':
namelist = optarg;
break;
case 'o':
option |= OUTSTANDING;
break;
case 'p':
option |= PID;
break;
case 't':
option |= TIME;
break;
case 'y':
use_sysctl = 0;
break;
case 'u':
user = optarg;
uid = user2uid(user);
break;
default:
usage();
}
/*
* If paths to the exec file or core file were specified, we
* aren't operating on the running kernel, so we can't use
* sysctl.
*/
if (namelist != NULL || core != NULL)
use_sysctl = 0;
if (!use_sysctl) {
kd = kvm_openfiles(namelist, core, NULL, O_RDONLY, kvmoferr);
if (kd == NULL)
errx(1, "kvm_openfiles: %s", kvmoferr);
switch (kvm_nlist(kd, symbols)) {
case 0:
break;
case -1:
errx(1, "unable to read kernel symbol table");
default:
#ifdef notdef /* they'll be told more civilly later */
warnx("nlist failed");
for (i = 0; symbols[i].n_name != NULL; i++)
if (symbols[i].n_value == 0)
warnx("symbol %s not found",
symbols[i].n_name);
#endif
break;
}
}
kget(X_MSGINFO, &msginfo, sizeof(msginfo));
if ((display & (MSGINFO | MSGTOTAL))) {
if (display & MSGTOTAL) {
printf("msginfo:\n");
printf("\tmsgmax: %12d\t(max characters in a message)\n",
msginfo.msgmax);
printf("\tmsgmni: %12d\t(# of message queues)\n",
msginfo.msgmni);
printf("\tmsgmnb: %12d\t(max characters in a message queue)\n",
msginfo.msgmnb);
printf("\tmsgtql: %12d\t(max # of messages in system)\n",
msginfo.msgtql);
printf("\tmsgssz: %12d\t(size of a message segment)\n",
msginfo.msgssz);
printf("\tmsgseg: %12d\t(# of message segments in system)\n\n",
msginfo.msgseg);
}
if (display & MSGINFO) {
struct msqid_kernel *kxmsqids;
size_t kxmsqids_len;
kxmsqids_len = sizeof(struct msqid_kernel) * msginfo.msgmni;
kxmsqids = malloc(kxmsqids_len);
kget(X_MSQIDS, kxmsqids, kxmsqids_len);
printf("Message Queues:\n");
printf("T %12s %12s %-11s %-8s %-8s", "ID", "KEY", "MODE",
"OWNER", "GROUP");
if (option & CREATOR)
printf(" %-8s %-8s", "CREATOR", "CGROUP");
if (option & OUTSTANDING)
printf(" %20s %20s", "CBYTES", "QNUM");
if (option & BIGGEST)
printf(" %20s", "QBYTES");
if (option & PID)
printf(" %12s %12s", "LSPID", "LRPID");
if (option & TIME)
printf(" %-8s %-8s %-8s", "STIME", "RTIME", "CTIME");
printf("\n");
for (i = 0; i < msginfo.msgmni; i += 1) {
if (kxmsqids[i].u.msg_qbytes != 0) {
char stime_buf[100], rtime_buf[100],
ctime_buf[100];
struct msqid_kernel *kmsqptr = &kxmsqids[i];
if (user)
if (uid != kmsqptr->u.msg_perm.uid)
continue;
cvt_time(kmsqptr->u.msg_stime, stime_buf);
cvt_time(kmsqptr->u.msg_rtime, rtime_buf);
cvt_time(kmsqptr->u.msg_ctime, ctime_buf);
printf("q %12d %12d %s %8s %8s",
IXSEQ_TO_IPCID(i, kmsqptr->u.msg_perm),
(int)kmsqptr->u.msg_perm.key,
fmt_perm(kmsqptr->u.msg_perm.mode),
user_from_uid(kmsqptr->u.msg_perm.uid, 0),
group_from_gid(kmsqptr->u.msg_perm.gid, 0));
if (option & CREATOR)
printf(" %8s %8s",
user_from_uid(kmsqptr->u.msg_perm.cuid, 0),
group_from_gid(kmsqptr->u.msg_perm.cgid, 0));
if (option & OUTSTANDING)
printf(" %12lu %12lu",
kmsqptr->u.msg_cbytes,
kmsqptr->u.msg_qnum);
if (option & BIGGEST)
printf(" %20lu",
kmsqptr->u.msg_qbytes);
if (option & PID)
printf(" %12d %12d",
kmsqptr->u.msg_lspid,
kmsqptr->u.msg_lrpid);
if (option & TIME)
printf(" %s %s %s",
stime_buf,
rtime_buf,
ctime_buf);
printf("\n");
}
}
printf("\n");
}
} else
if (display & (MSGINFO | MSGTOTAL)) {
fprintf(stderr,
"SVID messages facility not configured in the system\n");
}
kget(X_SHMINFO, &shminfo, sizeof(shminfo));
if ((display & (SHMINFO | SHMTOTAL))) {
if (display & SHMTOTAL) {
printf("shminfo:\n");
printf("\tshmmax: %12d\t(max shared memory segment size)\n",
shminfo.shmmax);
printf("\tshmmin: %12d\t(min shared memory segment size)\n",
shminfo.shmmin);
printf("\tshmmni: %12d\t(max number of shared memory identifiers)\n",
shminfo.shmmni);
printf("\tshmseg: %12d\t(max shared memory segments per process)\n",
shminfo.shmseg);
printf("\tshmall: %12d\t(max amount of shared memory in pages)\n\n",
shminfo.shmall);
}
if (display & SHMINFO) {
struct shmid_kernel *kxshmids;
size_t kxshmids_len;
kxshmids_len = sizeof(struct shmid_kernel) * shminfo.shmmni;
kxshmids = malloc(kxshmids_len);
kget(X_SHMSEGS, kxshmids, kxshmids_len);
printf("Shared Memory:\n");
printf("T %12s %12s %-11s %-8s %-8s", "ID", "KEY", "MODE",
"OWNER", "GROUP");
if (option & CREATOR)
printf(" %-8s %-8s", "CREATOR", "CGROUP");
if (option & OUTSTANDING)
printf(" %12s", "NATTCH");
if (option & BIGGEST)
printf(" %12s", "SEGSZ");
if (option & PID)
printf(" %12s %12s", "CPID", "LPID");
if (option & TIME)
printf(" %-8s %-8s %-8s", "ATIME", "DTIME", "CTIME");
printf("\n");
for (i = 0; i < shminfo.shmmni; i += 1) {
if (kxshmids[i].u.shm_perm.mode & 0x0800) {
char atime_buf[100], dtime_buf[100],
ctime_buf[100];
struct shmid_kernel *kshmptr = &kxshmids[i];
if (user)
if (uid != kshmptr->u.shm_perm.uid)
continue;
cvt_time(kshmptr->u.shm_atime, atime_buf);
cvt_time(kshmptr->u.shm_dtime, dtime_buf);
cvt_time(kshmptr->u.shm_ctime, ctime_buf);
printf("m %12d %12d %s %8s %8s",
IXSEQ_TO_IPCID(i, kshmptr->u.shm_perm),
(int)kshmptr->u.shm_perm.key,
fmt_perm(kshmptr->u.shm_perm.mode),
user_from_uid(kshmptr->u.shm_perm.uid, 0),
group_from_gid(kshmptr->u.shm_perm.gid, 0));
if (option & CREATOR)
printf(" %8s %8s",
user_from_uid(kshmptr->u.shm_perm.cuid, 0),
group_from_gid(kshmptr->u.shm_perm.cgid, 0));
if (option & OUTSTANDING)
printf(" %12d",
kshmptr->u.shm_nattch);
if (option & BIGGEST)
printf(" %12d",
kshmptr->u.shm_segsz);
if (option & PID)
printf(" %12d %12d",
kshmptr->u.shm_cpid,
kshmptr->u.shm_lpid);
if (option & TIME)
printf(" %s %s %s",
atime_buf,
dtime_buf,
ctime_buf);
printf("\n");
}
}
printf("\n");
}
} else
if (display & (SHMINFO | SHMTOTAL)) {
fprintf(stderr,
"SVID shared memory facility not configured in the system\n");
}
kget(X_SEMINFO, &seminfo, sizeof(seminfo));
if ((display & (SEMINFO | SEMTOTAL))) {
struct semid_kernel *kxsema;
size_t kxsema_len;
if (display & SEMTOTAL) {
printf("seminfo:\n");
printf("\tsemmap: %12d\t(# of entries in semaphore map)\n",
seminfo.semmap);
printf("\tsemmni: %12d\t(# of semaphore identifiers)\n",
seminfo.semmni);
printf("\tsemmns: %12d\t(# of semaphores in system)\n",
seminfo.semmns);
printf("\tsemmnu: %12d\t(# of undo structures in system)\n",
seminfo.semmnu);
printf("\tsemmsl: %12d\t(max # of semaphores per id)\n",
seminfo.semmsl);
printf("\tsemopm: %12d\t(max # of operations per semop call)\n",
seminfo.semopm);
printf("\tsemume: %12d\t(max # of undo entries per process)\n",
seminfo.semume);
printf("\tsemusz: %12d\t(size in bytes of undo structure)\n",
seminfo.semusz);
printf("\tsemvmx: %12d\t(semaphore maximum value)\n",
seminfo.semvmx);
printf("\tsemaem: %12d\t(adjust on exit max value)\n\n",
seminfo.semaem);
}
if (display & SEMINFO) {
kxsema_len = sizeof(struct semid_kernel) * seminfo.semmni;
kxsema = malloc(kxsema_len);
kget(X_SEMA, kxsema, kxsema_len);
printf("Semaphores:\n");
printf("T %12s %12s %-11s %-8s %-8s", "ID", "KEY", "MODE",
"OWNER", "GROUP");
if (option & CREATOR)
printf(" %-8s %-8s", "CREATOR", "CGROUP");
if (option & BIGGEST)
printf(" %12s", "NSEMS");
if (option & TIME)
printf(" %-8s %-8s", "OTIME", "CTIME");
printf("\n");
for (i = 0; i < seminfo.semmni; i += 1) {
if ((kxsema[i].u.sem_perm.mode & SEM_ALLOC) != 0) {
char ctime_buf[100], otime_buf[100];
struct semid_kernel *ksemaptr = &kxsema[i];
if (user)
if (uid != ksemaptr->u.sem_perm.uid)
continue;
cvt_time(ksemaptr->u.sem_otime, otime_buf);
cvt_time(ksemaptr->u.sem_ctime, ctime_buf);
printf("s %12d %12d %s %8s %8s",
IXSEQ_TO_IPCID(i, ksemaptr->u.sem_perm),
(int)ksemaptr->u.sem_perm.key,
fmt_perm(ksemaptr->u.sem_perm.mode),
user_from_uid(ksemaptr->u.sem_perm.uid, 0),
group_from_gid(ksemaptr->u.sem_perm.gid, 0));
if (option & CREATOR)
printf(" %8s %8s",
user_from_uid(ksemaptr->u.sem_perm.cuid, 0),
group_from_gid(ksemaptr->u.sem_perm.cgid, 0));
if (option & BIGGEST)
printf(" %12d",
ksemaptr->u.sem_nsems);
if (option & TIME)
printf(" %s %s",
otime_buf,
ctime_buf);
printf("\n");
}
}
printf("\n");
}
} else
if (display & (SEMINFO | SEMTOTAL)) {
fprintf(stderr, "SVID semaphores facility not configured in the system\n");
}
if (!use_sysctl)
kvm_close(kd);
exit(0);
}
void
sysctlgatherstruct(void *addr, size_t size, struct scgs_vector *vecarr)
{
struct scgs_vector *xp;
size_t tsiz;
int rv;
for (xp = vecarr; xp->sysctl != NULL; xp++) {
assert(xp->offset <= size);
tsiz = xp->size;
rv = sysctlbyname(xp->sysctl, (char *)addr + xp->offset,
&tsiz, NULL, 0);
if (rv == -1)
err(1, "sysctlbyname: %s", xp->sysctl);
if (tsiz != xp->size)
errx(1, "%s size mismatch (expected %d, got %d)",
xp->sysctl, xp->size, tsiz);
}
}
void
kget(int idx, void *addr, size_t size)
{
char *symn; /* symbol name */
size_t tsiz;
int rv;
unsigned long kaddr;
const char *sym2sysctl[] = { /* symbol to sysctl name table */
"kern.ipc.sema",
"kern.ipc.seminfo",
"kern.ipc.msginfo",
"kern.ipc.msqids",
"kern.ipc.shminfo",
"kern.ipc.shmsegs" };
assert((unsigned)idx <= sizeof(sym2sysctl) / sizeof(*sym2sysctl));
if (!use_sysctl) {
symn = symbols[idx].n_name;
if (*symn == '_')
symn++;
if (symbols[idx].n_type == 0 || symbols[idx].n_value == 0)
errx(1, "symbol %s undefined", symn);
/*
* For some symbols, the value we retreieve is
* actually a pointer; since we want the actual value,
* we have to manually dereference it.
*/
switch (idx) {
case X_MSQIDS:
tsiz = sizeof(msqids);
rv = kvm_read(kd, symbols[idx].n_value,
&msqids, tsiz);
kaddr = (u_long)msqids;
break;
case X_SHMSEGS:
tsiz = sizeof(shmsegs);
rv = kvm_read(kd, symbols[idx].n_value,
&shmsegs, tsiz);
kaddr = (u_long)shmsegs;
break;
case X_SEMA:
tsiz = sizeof(sema);
rv = kvm_read(kd, symbols[idx].n_value,
&sema, tsiz);
kaddr = (u_long)sema;
break;
default:
rv = tsiz = 0;
kaddr = symbols[idx].n_value;
break;
}
if ((unsigned)rv != tsiz)
errx(1, "%s: %s", symn, kvm_geterr(kd));
if ((unsigned)kvm_read(kd, kaddr, addr, size) != size)
errx(1, "%s: %s", symn, kvm_geterr(kd));
} else {
switch (idx) {
case X_SHMINFO:
sysctlgatherstruct(addr, size, shminfo_scgsv);
break;
case X_SEMINFO:
sysctlgatherstruct(addr, size, seminfo_scgsv);
break;
case X_MSGINFO:
sysctlgatherstruct(addr, size, msginfo_scgsv);
break;
default:
tsiz = size;
rv = sysctlbyname(sym2sysctl[idx], addr, &tsiz,
NULL, 0);
if (rv == -1)
err(1, "sysctlbyname: %s", sym2sysctl[idx]);
if (tsiz != size)
errx(1, "%s size mismatch "
"(expected %d, got %d)",
sym2sysctl[idx], size, tsiz);
break;
}
}
}
uid_t
user2uid(char *username)
{
struct passwd *pwd;
uid_t uid;
char *r;
uid = strtoul(username, &r, 0);
if (!*r && r != username)
return (uid);
if ((pwd = getpwnam(username)) == NULL)
errx(1, "getpwnam failed: No such user");
endpwent();
return (pwd->pw_uid);
}
void
usage(void)
{
fprintf(stderr,
"usage: ipcs [-abcmopqstyMQST] [-C corefile] [-N namelist] [-u user]\n");
exit(1);
}
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