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NetBSD/usr.bin/pkill/pkill.c

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/* $NetBSD: pkill.c,v 1.31 2017/02/21 13:09:56 kre Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Andrew Doran.
*
* 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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>
#ifndef lint
__RCSID("$NetBSD: pkill.c,v 1.31 2017/02/21 13:09:56 kre Exp $");
#endif /* !lint */
#include <sys/types.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <regex.h>
#include <ctype.h>
#include <kvm.h>
#include <err.h>
#include <pwd.h>
#include <grp.h>
#include <errno.h>
#include <paths.h>
#define STATUS_MATCH 0
#define STATUS_NOMATCH 1
#define STATUS_BADUSAGE 2
#define STATUS_ERROR 3
enum listtype {
LT_GENERIC,
LT_USER,
LT_GROUP,
LT_TTY,
LT_PGRP,
LT_SID
};
struct list {
SLIST_ENTRY(list) li_chain;
long li_number;
};
SLIST_HEAD(listhead, list);
static struct kinfo_proc2 *plist;
static char *selected;
static const char *delim = "\n";
static int nproc;
static int pgrep;
static int prenice;
static int signum = SIGTERM;
static int nicenum;
static int newest;
static int inverse;
static int longfmt;
static int matchargs;
static int fullmatch;
static int cflags = REG_EXTENDED;
static kvm_t *kd;
static pid_t mypid;
static struct listhead euidlist = SLIST_HEAD_INITIALIZER(list);
static struct listhead ruidlist = SLIST_HEAD_INITIALIZER(list);
static struct listhead rgidlist = SLIST_HEAD_INITIALIZER(list);
static struct listhead pgrplist = SLIST_HEAD_INITIALIZER(list);
static struct listhead ppidlist = SLIST_HEAD_INITIALIZER(list);
static struct listhead tdevlist = SLIST_HEAD_INITIALIZER(list);
static struct listhead sidlist = SLIST_HEAD_INITIALIZER(list);
static void usage(void) __dead;
static int killact(const struct kinfo_proc2 *);
static int reniceact(const struct kinfo_proc2 *);
static int grepact(const struct kinfo_proc2 *);
static void makelist(struct listhead *, enum listtype, char *);
int
main(int argc, char **argv)
{
char buf[_POSIX2_LINE_MAX], **pargv, *q;
int i, j, ch, bestidx, rv, criteria;
int (*action)(const struct kinfo_proc2 *);
const struct kinfo_proc2 *kp;
struct list *li;
const char *p;
u_int32_t bestsec, bestusec;
regex_t reg;
regmatch_t regmatch;
setprogname(argv[0]);
if (strcmp(getprogname(), "pgrep") == 0) {
action = grepact;
pgrep = 1;
} else if (strcmp(getprogname(), "prenice") == 0) {
action = reniceact;
prenice = 1;
} else {
action = killact;
p = argv[1];
if (argc > 1 && p[0] == '-') {
p++;
i = (int)strtol(p, &q, 10);
if (*q == '\0') {
signum = i;
argv++;
argc--;
} else {
if (strncasecmp(p, "sig", 3) == 0)
p += 3;
for (i = 1; i < NSIG; i++)
if (strcasecmp(sys_signame[i], p) == 0)
break;
if (i != NSIG) {
signum = i;
argv++;
argc--;
}
}
}
}
criteria = 0;
if (prenice) {
if (argc < 2)
usage();
if (strcmp(argv[1], "-l") == 0) {
longfmt = 1;
argv++;
argc--;
}
if (argc < 2)
usage();
p = argv[1];
i = (int)strtol(p, &q, 10);
if (*q == '\0') {
nicenum = i;
argv++;
argc--;
} else
usage();
} else {
while ((ch = getopt(argc, argv, "G:P:U:d:fg:ilns:t:u:vx")) != -1)
switch (ch) {
case 'G':
makelist(&rgidlist, LT_GROUP, optarg);
criteria = 1;
break;
case 'P':
makelist(&ppidlist, LT_GENERIC, optarg);
criteria = 1;
break;
case 'U':
makelist(&ruidlist, LT_USER, optarg);
criteria = 1;
break;
case 'd':
if (!pgrep)
usage();
delim = optarg;
break;
case 'f':
matchargs = 1;
break;
case 'g':
makelist(&pgrplist, LT_PGRP, optarg);
criteria = 1;
break;
case 'i':
cflags |= REG_ICASE;
break;
case 'l':
longfmt = 1;
break;
case 'n':
newest = 1;
criteria = 1;
break;
case 's':
makelist(&sidlist, LT_SID, optarg);
criteria = 1;
break;
case 't':
makelist(&tdevlist, LT_TTY, optarg);
criteria = 1;
break;
case 'u':
makelist(&euidlist, LT_USER, optarg);
criteria = 1;
break;
case 'v':
inverse = 1;
break;
case 'x':
fullmatch = 1;
break;
default:
usage();
/* NOTREACHED */
}
argc -= optind;
argv += optind;
}
if (argc != 0)
criteria = 1;
if (!criteria)
usage();
mypid = getpid();
/*
* Retrieve the list of running processes from the kernel.
*/
kd = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, buf);
if (kd == NULL)
errx(STATUS_ERROR, "Cannot open kernel files (%s)", buf);
plist = kvm_getproc2(kd, KERN_PROC_ALL, 0, sizeof(*plist), &nproc);
if (plist == NULL)
errx(STATUS_ERROR, "Cannot get process list (%s)",
kvm_geterr(kd));
/*
* Allocate memory which will be used to keep track of the
* selection.
*/
if ((selected = calloc((size_t)1, (size_t)nproc)) == NULL)
err(STATUS_ERROR, "Cannot allocate memory for %d processes",
nproc);
/*
* Refine the selection.
*/
for (; *argv != NULL; argv++) {
if ((rv = regcomp(&reg, *argv, cflags)) != 0) {
(void)regerror(rv, &reg, buf, sizeof(buf));
errx(STATUS_BADUSAGE,
"Cannot compile regular expression `%s' (%s)",
*argv, buf);
}
for (i = 0, kp = plist; i < nproc; i++, kp++) {
if ((kp->p_flag & P_SYSTEM) != 0 || kp->p_pid == mypid)
continue;
if ((pargv = kvm_getargv2(kd, kp, 0)) == NULL)
continue;
if (matchargs) {
j = 0;
while (j < (int)sizeof(buf) && *pargv != NULL) {
j += snprintf(buf + j, sizeof(buf) - j,
pargv[1] != NULL ? "%s " : "%s",
pargv[0]);
pargv++;
}
} else if (pargv[0] != NULL)
strlcpy(buf, pargv[0], sizeof(buf));
else
strlcpy(buf, kp->p_comm, sizeof(buf));
rv = regexec(&reg, buf, 1, &regmatch, 0);
if (rv == 0) {
if (fullmatch) {
if (regmatch.rm_so == 0 &&
regmatch.rm_eo ==
(regoff_t)strlen(buf))
selected[i] = 1;
} else
selected[i] = 1;
} else if (rv != REG_NOMATCH) {
(void)regerror(rv, &reg, buf, sizeof(buf));
errx(STATUS_ERROR,
"Regular expression evaluation error (%s)",
buf);
}
}
regfree(&reg);
}
for (i = 0, kp = plist; i < nproc; i++, kp++) {
if ((kp->p_flag & P_SYSTEM) != 0)
continue;
SLIST_FOREACH(li, &ruidlist, li_chain)
if (kp->p_ruid == (uid_t)li->li_number)
break;
if (SLIST_FIRST(&ruidlist) != NULL && li == NULL) {
selected[i] = 0;
continue;
}
SLIST_FOREACH(li, &rgidlist, li_chain)
if (kp->p_rgid == (gid_t)li->li_number)
break;
if (SLIST_FIRST(&rgidlist) != NULL && li == NULL) {
selected[i] = 0;
continue;
}
SLIST_FOREACH(li, &euidlist, li_chain)
if (kp->p_uid == (uid_t)li->li_number)
break;
if (SLIST_FIRST(&euidlist) != NULL && li == NULL) {
selected[i] = 0;
continue;
}
SLIST_FOREACH(li, &ppidlist, li_chain)
if ((uid_t)kp->p_ppid == (uid_t)li->li_number)
break;
if (SLIST_FIRST(&ppidlist) != NULL && li == NULL) {
selected[i] = 0;
continue;
}
SLIST_FOREACH(li, &pgrplist, li_chain)
if (kp->p__pgid == (pid_t)li->li_number)
break;
if (SLIST_FIRST(&pgrplist) != NULL && li == NULL) {
selected[i] = 0;
continue;
}
SLIST_FOREACH(li, &tdevlist, li_chain) {
if (li->li_number == -1 &&
(kp->p_flag & P_CONTROLT) == 0)
break;
if (kp->p_tdev == (uid_t)li->li_number)
break;
}
if (SLIST_FIRST(&tdevlist) != NULL && li == NULL) {
selected[i] = 0;
continue;
}
SLIST_FOREACH(li, &sidlist, li_chain)
if (kp->p_sid == (pid_t)li->li_number)
break;
if (SLIST_FIRST(&sidlist) != NULL && li == NULL) {
selected[i] = 0;
continue;
}
if (argc == 0)
selected[i] = 1;
}
if (newest) {
bestsec = 0;
bestusec = 0;
bestidx = -1;
for (i = 0, kp = plist; i < nproc; i++, kp++) {
if (!selected[i])
continue;
if (kp->p_ustart_sec > bestsec ||
(kp->p_ustart_sec == bestsec
&& kp->p_ustart_usec > bestusec)) {
bestsec = kp->p_ustart_sec;
bestusec = kp->p_ustart_usec;
bestidx = i;
}
}
(void)memset(selected, 0, (size_t)nproc);
if (bestidx != -1)
selected[bestidx] = 1;
}
/*
* Take the appropriate action for each matched process, if any.
*/
for (i = 0, rv = 0, kp = plist; i < nproc; i++, kp++) {
if (kp->p_pid == mypid)
continue;
if (selected[i]) {
if (inverse)
continue;
} else if (!inverse)
continue;
if ((kp->p_flag & P_SYSTEM) != 0)
continue;
rv |= (*action)(kp);
}
return rv ? STATUS_MATCH : STATUS_NOMATCH;
}
static void
usage(void)
{
const char *ustr;
if (prenice)
fprintf(stderr, "Usage: %s [-l] priority pattern ...\n",
getprogname());
else {
if (pgrep)
ustr = "[-filnvx] [-d delim]";
else
ustr = "[-signal] [-filnvx]";
(void)fprintf(stderr,
"Usage: %s %s [-G gid] [-g pgrp] [-P ppid] [-s sid] "
"[-t tty]\n"
" [-U uid] [-u euid] pattern ...\n",
getprogname(), ustr);
}
exit(STATUS_BADUSAGE);
}
static int
killact(const struct kinfo_proc2 *kp)
{
if (longfmt)
grepact(kp);
if (kill(kp->p_pid, signum) == -1) {
/*
* Check for ESRCH, which indicates that the process
* disappeared between us matching it and us
* signalling it; don't issue a warning about it.
*/
if (errno != ESRCH)
warn("signalling pid %d", (int)kp->p_pid);
/*
* Return 0 to indicate that the process should not be
* considered a match, since we didn't actually get to
* signal it.
*/
return 0;
}
return 1;
}
static int
reniceact(const struct kinfo_proc2 *kp)
{
int oldprio;
if (longfmt)
grepact(kp);
errno = 0;
if ((oldprio = getpriority(PRIO_PROCESS, kp->p_pid)) == -1 &&
errno != 0) {
warn("%d: getpriority", kp->p_pid);
return 0;
}
if (setpriority(PRIO_PROCESS, kp->p_pid, nicenum) == -1) {
warn("%d: setpriority", kp->p_pid);
return 0;
}
(void)printf("%d: old priority %d, new priority %d\n",
kp->p_pid, oldprio, nicenum);
return 1;
}
static int
grepact(const struct kinfo_proc2 *kp)
{
char **argv;
if (longfmt && matchargs) {
/*
* If kvm_getargv2() failed the process has probably
* disappeared. Return 0 to indicate that the process
* should not be considered a match, since we are no
* longer in a position to output it as a match.
*/
if ((argv = kvm_getargv2(kd, kp, 0)) == NULL)
return 0;
(void)printf("%d ", (int)kp->p_pid);
for (; *argv != NULL; argv++) {
(void)printf("%s", *argv);
if (argv[1] != NULL)
(void)putchar(' ');
}
} else if (longfmt)
(void)printf("%d %s", (int)kp->p_pid, kp->p_comm);
else
(void)printf("%d", (int)kp->p_pid);
(void)printf("%s", delim);
return 1;
}
static void
makelist(struct listhead *head, enum listtype type, char *src)
{
struct list *li;
struct passwd *pw;
struct group *gr;
struct stat st;
char *sp, *ep, buf[MAXPATHLEN];
const char *p;
int empty;
const char *prefix = _PATH_DEV;
empty = 1;
while ((sp = strsep(&src, ",")) != NULL) {
if (*sp == '\0')
usage();
if ((li = malloc(sizeof(*li))) == NULL)
err(STATUS_ERROR, "Cannot allocate %zu bytes",
sizeof(*li));
SLIST_INSERT_HEAD(head, li, li_chain);
empty = 0;
li->li_number = (uid_t)strtol(sp, &ep, 0);
if (*ep == '\0' && type != LT_TTY) {
switch (type) {
case LT_PGRP:
if (li->li_number == 0)
li->li_number = getpgrp();
break;
case LT_SID:
if (li->li_number == 0)
li->li_number = getsid(mypid);
break;
default:
break;
}
continue;
}
switch (type) {
case LT_USER:
if ((pw = getpwnam(sp)) == NULL)
errx(STATUS_BADUSAGE, "Unknown user `%s'",
sp);
li->li_number = pw->pw_uid;
break;
case LT_GROUP:
if ((gr = getgrnam(sp)) == NULL)
errx(STATUS_BADUSAGE, "Unknown group `%s'",
sp);
li->li_number = gr->gr_gid;
break;
case LT_TTY:
p = sp;
if (*sp == '/')
prefix = "";
else if (strcmp(sp, "-") == 0) {
li->li_number = -1;
break;
} else if (strcmp(sp, "co") == 0)
p = "console";
else if (strncmp(sp, "tty", 3) == 0)
/* all set */;
else if (strncmp(sp, "pts/", 4) == 0)
/* all set */;
else if (*ep != '\0' || (strlen(sp) == 2 && *sp == '0'))
prefix = _PATH_TTY;
else
prefix = _PATH_DEV_PTS;
(void)snprintf(buf, sizeof(buf), "%s%s", prefix, p);
if (stat(buf, &st) == -1) {
if (errno == ENOENT)
errx(STATUS_BADUSAGE,
"No such tty: `%s'", buf);
err(STATUS_ERROR, "Cannot access `%s'", buf);
}
if ((st.st_mode & S_IFCHR) == 0)
errx(STATUS_BADUSAGE, "Not a tty: `%s'", buf);
li->li_number = st.st_rdev;
break;
default:
usage();
}
}
if (empty)
usage();
}
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