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NetBSD/sbin/swapctl/swapctl.c

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/* $NetBSD: swapctl.c,v 1.41 2022/04/04 19:33:44 andvar Exp $ */
/*
* Copyright (c) 1996, 1997, 1999, 2015 Matthew R. Green
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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.
*/
/*
* swapctl command:
* -A add all devices listed as `sw' in /etc/fstab (also
* (sets the dump device, if listed in fstab)
* -D [<dev>|none] set dumpdev to <dev> or disable dumps
* -z show dumpdev
* -U remove all devices listed as `sw' in /etc/fstab.
* -t [blk|noblk|auto]
* if -A or -U , add (remove) either all block device
* or all non-block devices, or all swap partitions
* -q check if any swap or dump devices are defined in
* /etc/fstab
* -a <dev> add this device
* -d <dev> remove this swap device
* -f with -A -t auto, use the first swap as dump device
* -g use gigabytes
* -h use humanize_number(3) for listing
* -l list swap devices
* -m use megabytes
* -n print actions, but do not add/remove swap or
* with -A/-U
* -o with -A -t auto only configure the first swap as dump,
* (similar to -f), but do not add any further swap devs
* -s short listing of swap devices
* -k use kilobytes
* -p <pri> use this priority
* -c change priority
*
* or, if invoked as "swapon" (compatibility mode):
*
* -a all devices listed as `sw' in /etc/fstab
* -t same as -t above (feature not present in old
* swapon(8) command)
* <dev> add this device
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: swapctl.c,v 1.41 2022/04/04 19:33:44 andvar Exp $");
#endif
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/swap.h>
#include <sys/sysctl.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <unistd.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fstab.h>
#include <fcntl.h>
#include <util.h>
#include <paths.h>
#include "swapctl.h"
static int command;
/*
* Commands for swapctl(8). These are mutually exclusive.
*/
#define CMD_A 0x01 /* process /etc/fstab for adding */
#define CMD_D 0x02 /* set dumpdev */
#define CMD_U 0x04 /* process /etc/fstab for removing */
#define CMD_a 0x08 /* add a swap file/device */
#define CMD_c 0x10 /* change priority of a swap file/device */
#define CMD_d 0x20 /* delete a swap file/device */
#define CMD_l 0x40 /* list swap files/devices */
#define CMD_s 0x80 /* summary of swap files/devices */
#define CMD_z 0x100 /* show dump device */
#define CMD_q 0x200 /* check for dump/swap in /etc/fstab */
#define SET_COMMAND(cmd) \
do { \
if (command) \
usage(); \
command = (cmd); \
} while (0)
/*
* Commands that require a "path" argument at the end of the command
* line, and the ones which require that none exist.
*/
#define REQUIRE_PATH (CMD_D | CMD_a | CMD_c | CMD_d)
#define REQUIRE_NOPATH (CMD_A | CMD_U | CMD_l | CMD_s | CMD_z | CMD_q)
/*
* Option flags, and the commands with which they are valid.
*/
static int kflag; /* display in 1K^x blocks */
#define KFLAG_CMDS (CMD_l | CMD_s)
#define MFLAG_CMDS (CMD_l | CMD_s)
#define GFLAG_CMDS (CMD_l | CMD_s)
static int hflag; /* display with humanize_number */
#define HFLAG_CMDS (CMD_l | CMD_s)
static int pflag; /* priority was specified */
#define PFLAG_CMDS (CMD_A | CMD_a | CMD_c)
static char *tflag; /* swap device type (blk, noblk, auto) */
static int autoflag; /* 1, if tflag is "auto" */
#define TFLAG_CMDS (CMD_A | CMD_U)
static int fflag; /* first swap becomes dump */
#define FFLAG_CMDS (CMD_A)
static int oflag; /* only autoset dump device */
#define OFLAG_CMDS (CMD_A)
static int nflag; /* no execute, just print actions */
#define NFLAG_CMDS (CMD_A | CMD_U)
static int pri; /* uses 0 as default pri */
static void change_priority(char *);
static int add_swap(char *, int);
static int delete_swap(char *);
static int set_dumpdev1(char *);
static void set_dumpdev(char *);
static int get_dumpdev(void);
__dead static void do_fstab(int);
static int check_fstab(void);
static void do_localdevs(int);
static void do_localdisk(const char *, int);
static int do_wedgesofdisk(int fd, int);
static int do_partitionsofdisk(const char *, int fd, int);
__dead static void usage(void);
__dead static void swapon_command(int, char **);
#if 0
static void swapoff_command(int, char **);
#endif
int
main(int argc, char *argv[])
{
int c;
if (strcmp(getprogname(), "swapon") == 0) {
swapon_command(argc, argv);
/* NOTREACHED */
}
#if 0
if (strcmp(getprogname(), "swapoff") == 0) {
swapoff_command(argc, argv);
/* NOTREACHED */
}
#endif
while ((c = getopt(argc, argv, "ADUacdfghklmnop:qst:z")) != -1) {
switch (c) {
case 'A':
SET_COMMAND(CMD_A);
break;
case 'D':
SET_COMMAND(CMD_D);
break;
case 'U':
SET_COMMAND(CMD_U);
break;
case 'a':
SET_COMMAND(CMD_a);
break;
case 'c':
SET_COMMAND(CMD_c);
break;
case 'd':
SET_COMMAND(CMD_d);
break;
case 'f':
fflag = 1;
break;
case 'g':
kflag = 3; /* 1k ^ 3 */
break;
case 'h':
hflag = 1;
break;
case 'k':
kflag = 1;
break;
case 'l':
SET_COMMAND(CMD_l);
break;
case 'm':
kflag = 2; /* 1k ^ 2 */
break;
case 'n':
nflag = 1;
break;
case 'o':
oflag = 1;
break;
case 'p':
pflag = 1;
/* XXX strtol() */
pri = atoi(optarg);
break;
case 'q':
SET_COMMAND(CMD_q);
break;
case 's':
SET_COMMAND(CMD_s);
break;
case 't':
if (tflag != NULL)
usage();
tflag = optarg;
if (strcmp(tflag, "auto") == 0)
autoflag = 1;
break;
case 'z':
SET_COMMAND(CMD_z);
break;
default:
usage();
/* NOTREACHED */
}
}
/* Did the user specify a command? */
if (command == 0)
usage();
argv += optind;
argc -= optind;
switch (argc) {
case 0:
if (command & REQUIRE_PATH)
usage();
break;
case 1:
if (command & REQUIRE_NOPATH)
usage();
break;
default:
usage();
}
/* To change priority, you have to specify one. */
if ((command == CMD_c) && pflag == 0)
usage();
/* -f and -o are mutually exclusive */
if (fflag && oflag)
usage();
/* Sanity-check -t */
if (tflag != NULL) {
if (command != CMD_A && command != CMD_U)
usage();
if (strcmp(tflag, "blk") != 0 &&
strcmp(tflag, "noblk") != 0 &&
strcmp(tflag, "auto") != 0)
usage();
}
/* Dispatch the command. */
switch (command) {
case CMD_l:
if (!list_swap(pri, kflag, pflag, 0, 1, hflag))
exit(1);
break;
case CMD_s:
list_swap(pri, kflag, pflag, 0, 0, hflag);
break;
case CMD_c:
change_priority(argv[0]);
break;
case CMD_a:
if (! add_swap(argv[0], pri))
exit(1);
break;
case CMD_d:
if (! delete_swap(argv[0]))
exit(1);
break;
case CMD_A:
if (autoflag)
do_localdevs(1);
else
do_fstab(1);
break;
case CMD_D:
set_dumpdev(argv[0]);
break;
case CMD_z:
if (!get_dumpdev())
exit(1);
break;
case CMD_U:
if (autoflag)
do_localdevs(0);
else
do_fstab(0);
break;
case CMD_q:
if (check_fstab()) {
printf("%s: there are swap or dump devices defined in "
_PATH_FSTAB "\n", getprogname());
exit(0);
} else {
printf("%s: no swap or dump devices in "
_PATH_FSTAB "\n", getprogname());
exit(1);
}
}
exit(0);
}
/*
* swapon_command: emulate the old swapon(8) program.
*/
static void
swapon_command(int argc, char **argv)
{
int ch, fiztab = 0;
while ((ch = getopt(argc, argv, "at:")) != -1) {
switch (ch) {
case 'a':
fiztab = 1;
break;
case 't':
if (tflag != NULL)
usage();
tflag = optarg;
break;
default:
goto swapon_usage;
}
}
argc -= optind;
argv += optind;
if (fiztab) {
if (argc)
goto swapon_usage;
/* Sanity-check -t */
if (tflag != NULL) {
if (strcmp(tflag, "blk") != 0 &&
strcmp(tflag, "noblk") != 0)
usage();
}
do_fstab(1);
exit(0);
} else if (argc == 0 || tflag != NULL)
goto swapon_usage;
while (argc) {
if (! add_swap(argv[0], pri))
exit(1);
argc--;
argv++;
}
exit(0);
/* NOTREACHED */
swapon_usage:
fprintf(stderr, "usage: %s -a [-t blk|noblk]\n", getprogname());
fprintf(stderr, " %s <path> ...\n", getprogname());
exit(1);
}
/*
* change_priority: change the priority of a swap device.
*/
static void
change_priority(char *path)
{
if (swapctl(SWAP_CTL, path, pri) < 0)
err(1, "%s", path);
}
/*
* add_swap: add the pathname to the list of swap devices.
*/
static int
add_swap(char *path, int priority)
{
struct stat sb;
char buf[MAXPATHLEN];
char *spec;
if (getfsspecname(buf, sizeof(buf), path) == NULL)
goto oops;
spec = buf;
if (stat(spec, &sb) < 0)
goto oops;
if (sb.st_mode & S_IROTH)
warnx("WARNING: %s is readable by the world", path);
if (sb.st_mode & S_IWOTH)
warnx("WARNING: %s is writable by the world", path);
if (fflag || oflag) {
set_dumpdev1(spec);
if (oflag)
exit(0);
else
fflag = 0;
}
if (nflag)
return 1;
if (swapctl(SWAP_ON, spec, priority) < 0) {
oops:
warn("%s", path);
return 0;
}
return 1;
}
/*
* delete_swap: remove the pathname to the list of swap devices.
*/
static int
delete_swap(char *path)
{
char buf[MAXPATHLEN];
char *spec;
if (getfsspecname(buf, sizeof(buf), path) == NULL) {
warn("%s", path);
return 0;
}
spec = buf;
if (nflag)
return 1;
if (swapctl(SWAP_OFF, spec, pri) < 0) {
warn("%s", path);
return 0;
}
return 1;
}
static int
set_dumpdev1(char *spec)
{
int rv = 0;
if (!nflag) {
if (strcmp(spec, "none") == 0)
rv = swapctl(SWAP_DUMPOFF, NULL, 0);
else
rv = swapctl(SWAP_DUMPDEV, spec, 0);
}
if (rv == -1)
warn("could not set dump device to %s", spec);
else
printf("%s: setting dump device to %s\n", getprogname(), spec);
return rv == -1 ? 0 : 1;
}
static void
set_dumpdev(char *path)
{
char buf[MAXPATHLEN];
char *spec;
if (getfsspecname(buf, sizeof(buf), path) == NULL)
err(1, "%s", path);
spec = buf;
if (! set_dumpdev1(spec))
exit(1);
}
static int
get_dumpdev(void)
{
dev_t dev;
char *name;
if (swapctl(SWAP_GETDUMPDEV, &dev, 0) == -1) {
warn("could not get dump device");
return 0;
} else if (dev == NODEV) {
printf("no dump device set\n");
return 0;
} else {
name = devname(dev, S_IFBLK);
printf("dump device is ");
if (name)
printf("%s\n", name);
else
printf("major %llu minor %llu\n",
(unsigned long long)major(dev),
(unsigned long long)minor(dev));
}
return 1;
}
static void
do_localdevs(int add)
{
size_t ressize;
char *disknames, *disk;
static const char mibname[] = "hw.disknames";
ressize = 0;
if (sysctlbyname(mibname, NULL, &ressize, NULL, 0))
return;
ressize += 200; /* add some arbitrary slope */
disknames = malloc(ressize);
if (sysctlbyname(mibname, disknames, &ressize, NULL, 0) == 0) {
for (disk = strtok(disknames, " "); disk;
disk = strtok(NULL, " "))
do_localdisk(disk, add);
}
free(disknames);
}
static void
do_localdisk(const char *disk, int add)
{
int fd;
char dvname[MAXPATHLEN];
if ((fd = opendisk(disk, O_RDONLY, dvname, sizeof(dvname), 0)) == -1)
return;
if (!do_wedgesofdisk(fd, add))
do_partitionsofdisk(disk, fd, add);
close(fd);
}
static int
do_wedgesofdisk(int fd, int add)
{
char devicename[MAXPATHLEN];
struct dkwedge_info *dkw;
struct dkwedge_list dkwl;
size_t bufsize;
u_int i;
dkw = NULL;
dkwl.dkwl_buf = dkw;
dkwl.dkwl_bufsize = 0;
for (;;) {
if (ioctl(fd, DIOCLWEDGES, &dkwl) == -1)
return 0;
if (dkwl.dkwl_nwedges == dkwl.dkwl_ncopied)
break;
bufsize = dkwl.dkwl_nwedges * sizeof(*dkw);
if (dkwl.dkwl_bufsize < bufsize) {
dkw = realloc(dkwl.dkwl_buf, bufsize);
if (dkw == NULL)
return 0;
dkwl.dkwl_buf = dkw;
dkwl.dkwl_bufsize = bufsize;
}
}
for (i = 0; i < dkwl.dkwl_ncopied; i++) {
if (strcmp(dkw[i].dkw_ptype, DKW_PTYPE_SWAP) != 0)
continue;
snprintf(devicename, sizeof(devicename), "%s%s", _PATH_DEV,
dkw[i].dkw_devname);
devicename[sizeof(devicename)-1] = '\0';
if (add) {
if (add_swap(devicename, pri)) {
printf(
"%s: adding %s as swap device at priority 0\n",
getprogname(), devicename);
}
} else {
if (delete_swap(devicename)) {
printf(
"%s: removing %s as swap device\n",
getprogname(), devicename);
}
}
}
free(dkw);
return dkwl.dkwl_nwedges != 0;
}
static int
do_partitionsofdisk(const char *prefix, int fd, int add)
{
char devicename[MAXPATHLEN];
struct disklabel lab;
uint i;
if (ioctl(fd, DIOCGDINFO, &lab) != 0)
return 0;
for (i = 0; i < lab.d_npartitions; i++) {
if (lab.d_partitions[i].p_fstype != FS_SWAP)
continue;
snprintf(devicename, sizeof(devicename), "%s%s%c", _PATH_DEV,
prefix, 'a'+i);
devicename[sizeof(devicename)-1] = '\0';
if (add) {
if (add_swap(devicename, pri)) {
printf(
"%s: adding %s as swap device at priority 0\n",
getprogname(), devicename);
}
} else {
if (delete_swap(devicename)) {
printf(
"%s: removing %s as swap device\n",
getprogname(), devicename);
}
}
}
return 1;
}
static int
check_fstab(void)
{
struct fstab *fp;
while ((fp = getfsent()) != NULL) {
if (strcmp(fp->fs_type, "dp") == 0)
return 1;
if (strcmp(fp->fs_type, "sw") == 0)
return 1;
}
return 0;
}
static void
do_fstab(int add)
{
struct fstab *fp;
char *s;
long priority;
struct stat st;
int isblk;
int success = 0; /* set to 1 after a successful operation */
int error = 0; /* set to 1 after an error */
#ifdef RESCUEDIR
#define PATH_MOUNT RESCUEDIR "/mount_nfs"
#define PATH_UMOUNT RESCUEDIR "/umount"
#else
#define PATH_MOUNT "/sbin/mount_nfs"
#define PATH_UMOUNT "/sbin/umount"
#endif
char cmd[2*PATH_MAX+sizeof(PATH_MOUNT)+2];
#define PRIORITYEQ "priority="
#define NFSMNTPT "nfsmntpt="
while ((fp = getfsent()) != NULL) {
char buf[MAXPATHLEN];
char *spec, *fsspec;
if (getfsspecname(buf, sizeof(buf), fp->fs_spec) == NULL) {
warn("%s", buf);
continue;
}
fsspec = spec = buf;
cmd[0] = '\0';
if (strcmp(fp->fs_type, "dp") == 0 && add) {
set_dumpdev1(spec);
continue;
}
if (strcmp(fp->fs_type, "sw") != 0)
continue;
/* handle dp as mnt option */
if (strstr(fp->fs_mntops, "dp") && add)
set_dumpdev1(spec);
isblk = 0;
if ((s = strstr(fp->fs_mntops, PRIORITYEQ)) != NULL) {
s += sizeof(PRIORITYEQ) - 1;
priority = atol(s);
} else
priority = pri;
if ((s = strstr(fp->fs_mntops, NFSMNTPT)) != NULL) {
char *t;
/*
* Skip this song and dance if we're only
* doing block devices.
*/
if (tflag != NULL && strcmp(tflag, "blk") == 0)
continue;
t = strpbrk(s, ",");
if (t != 0)
*t = '\0';
spec = strdup(s + strlen(NFSMNTPT));
if (t != 0)
*t = ',';
if (spec == NULL)
errx(1, "Out of memory");
if (strlen(spec) == 0) {
warnx("empty mountpoint");
free(spec);
continue;
}
if (add) {
snprintf(cmd, sizeof(cmd), "%s %s %s",
PATH_MOUNT, fsspec, spec);
if (system(cmd) != 0) {
warnx("%s: mount failed", fsspec);
continue;
}
} else {
snprintf(cmd, sizeof(cmd), "%s %s",
PATH_UMOUNT, fsspec);
}
} else {
/*
* Determine blk-ness.
*/
if (stat(spec, &st) < 0) {
warn("%s", spec);
continue;
}
if (S_ISBLK(st.st_mode))
isblk = 1;
}
/*
* Skip this type if we're told to.
*/
if (tflag != NULL) {
if (strcmp(tflag, "blk") == 0 && isblk == 0)
continue;
if (strcmp(tflag, "noblk") == 0 && isblk == 1)
continue;
}
if (add) {
if (add_swap(spec, (int)priority)) {
success = 1;
printf(
"%s: adding %s as swap device at priority %d\n",
getprogname(), fsspec, (int)priority);
} else {
error = 1;
fprintf(stderr,
"%s: failed to add %s as swap device\n",
getprogname(), fsspec);
}
} else {
if (delete_swap(spec)) {
success = 1;
printf(
"%s: removing %s as swap device\n",
getprogname(), fsspec);
} else {
error = 1;
fprintf(stderr,
"%s: failed to remove %s as swap device\n",
getprogname(), fsspec);
}
if (cmd[0]) {
if (system(cmd) != 0) {
warnx("%s: umount failed", fsspec);
error = 1;
continue;
}
}
}
if (spec != fsspec)
free(spec);
}
if (error)
exit(1);
else if (success)
exit(0);
else
exit(2); /* not really an error, but no swap devices found */
}
static void
usage(void)
{
const char *progname = getprogname();
fprintf(stderr, "usage: %s -A [-f|-o] [-n] [-p priority] "
"[-t blk|noblk|auto]\n", progname);
fprintf(stderr, " %s -a [-p priority] path\n", progname);
fprintf(stderr, " %s -q\n", progname);
fprintf(stderr, " %s -c -p priority path\n", progname);
fprintf(stderr, " %s -D dumpdev|none\n", progname);
fprintf(stderr, " %s -d path\n", progname);
fprintf(stderr, " %s -l | -s [-k|-m|-g|-h]\n", progname);
fprintf(stderr, " %s -U [-n] [-t blk|noblk|auto]\n", progname);
fprintf(stderr, " %s -z\n", progname);
exit(1);
}
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