FreeBSD-5.3/usr.bin/pkill/pkill.c
/* $NetBSD: pkill.c,v 1.7 2004/02/15 17:03:30 soren 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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>
__FBSDID("$FreeBSD: src/usr.bin/pkill/pkill.c,v 1.18 2004/07/15 08:10:26 tjr Exp $");
#include <sys/types.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <sys/user.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <paths.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <regex.h>
#include <ctype.h>
#include <fcntl.h>
#include <kvm.h>
#include <err.h>
#include <pwd.h>
#include <grp.h>
#include <errno.h>
#include <locale.h>
#define STATUS_MATCH 0
#define STATUS_NOMATCH 1
#define STATUS_BADUSAGE 2
#define STATUS_ERROR 3
/* Check for system-processes which should always be ignored. */
#define IS_KERNPROC(kp) ((kp)->ki_flag & P_KTHREAD)
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);
struct kinfo_proc *plist;
char *selected;
const char *delim = "\n";
int nproc;
int pgrep;
int signum = SIGTERM;
int newest;
int inverse;
int longfmt;
int matchargs;
int fullmatch;
kvm_t *kd;
pid_t mypid;
struct listhead euidlist = SLIST_HEAD_INITIALIZER(list);
struct listhead ruidlist = SLIST_HEAD_INITIALIZER(list);
struct listhead rgidlist = SLIST_HEAD_INITIALIZER(list);
struct listhead pgrplist = SLIST_HEAD_INITIALIZER(list);
struct listhead ppidlist = SLIST_HEAD_INITIALIZER(list);
struct listhead tdevlist = SLIST_HEAD_INITIALIZER(list);
struct listhead sidlist = SLIST_HEAD_INITIALIZER(list);
int main(int, char **);
void usage(void);
void killact(struct kinfo_proc *);
void grepact(struct kinfo_proc *);
void makelist(struct listhead *, enum listtype, char *);
int
main(int argc, char **argv)
{
extern char *optarg;
extern int optind;
char buf[_POSIX2_LINE_MAX], *mstr, **pargv, *p, *q;
const char *execf, *coref;
int debug_opt;
int i, ch, bestidx, rv, criteria, drop_privs;
size_t jsz;
void (*action)(struct kinfo_proc *);
struct kinfo_proc *kp;
struct list *li;
struct timeval best_tval;
regex_t reg;
regmatch_t regmatch;
setlocale(LC_ALL, "");
if (strcmp(getprogname(), "pgrep") == 0) {
action = grepact;
pgrep = 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;
debug_opt = 0;
drop_privs = 0;
execf = coref = _PATH_DEVNULL;
while ((ch = getopt(argc, argv, "DG:M:N:P:U:d:fg:lns:t:u:vx")) != -1)
switch (ch) {
case 'D':
debug_opt++;
break;
case 'G':
makelist(&rgidlist, LT_GROUP, optarg);
criteria = 1;
break;
case 'M':
coref = optarg;
drop_privs = 1;
break;
case 'N':
execf = optarg;
drop_privs = 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 'l':
if (!pgrep)
usage();
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();
/*
* Discard privileges if not the running kernel so that bad
* guys can't print interesting stuff from kernel memory.
*/
if (drop_privs) {
setgid(getgid());
setuid(getuid());
}
mypid = getpid();
/*
* Retrieve the list of running processes from the kernel.
*/
kd = kvm_openfiles(execf, coref, NULL, O_RDONLY, buf);
if (kd == NULL)
errx(STATUS_ERROR, "kvm_openfiles(): %s", buf);
/*
* Use KERN_PROC_PROC instead of KERN_PROC_ALL, since we
* just want processes and not individual kernel threads.
*/
plist = kvm_getprocs(kd, KERN_PROC_PROC, 0, &nproc);
if (plist == NULL)
errx(STATUS_ERROR, "kvm_getprocs() failed");
/*
* Allocate memory which will be used to keep track of the
* selection.
*/
if ((selected = malloc(nproc)) == NULL)
errx(STATUS_ERROR, "memory allocation failure");
memset(selected, 0, nproc);
/*
* Refine the selection.
*/
for (; *argv != NULL; argv++) {
if ((rv = regcomp(®, *argv, REG_EXTENDED)) != 0) {
regerror(rv, ®, buf, sizeof(buf));
errx(STATUS_BADUSAGE, "bad expression: %s", buf);
}
for (i = 0, kp = plist; i < nproc; i++, kp++) {
if (IS_KERNPROC(kp) != 0) {
if (debug_opt > 0)
fprintf(stderr, "* Skipped %5d %3d %s\n",
kp->ki_pid, kp->ki_uid, kp->ki_comm);
continue;
}
if (matchargs) {
if ((pargv = kvm_getargv(kd, kp, 0)) == NULL)
continue;
jsz = 0;
while (jsz < sizeof(buf) && *pargv != NULL) {
jsz += snprintf(buf + jsz,
sizeof(buf) - jsz,
pargv[1] != NULL ? "%s " : "%s",
pargv[0]);
pargv++;
}
mstr = buf;
} else
mstr = kp->ki_comm;
rv = regexec(®, mstr, 1, ®match, 0);
if (rv == 0) {
if (fullmatch) {
if (regmatch.rm_so == 0 &&
regmatch.rm_eo ==
(off_t)strlen(mstr))
selected[i] = 1;
} else
selected[i] = 1;
} else if (rv != REG_NOMATCH) {
regerror(rv, ®, buf, sizeof(buf));
errx(STATUS_ERROR, "regexec(): %s", buf);
}
if (debug_opt > 1) {
const char *rv_res = "NoMatch";
if (selected[i])
rv_res = "Matched";
fprintf(stderr, "* %s %5d %3d %s\n", rv_res,
kp->ki_pid, kp->ki_uid, mstr);
}
}
regfree(®);
}
for (i = 0, kp = plist; i < nproc; i++, kp++) {
if (IS_KERNPROC(kp) != 0)
continue;
SLIST_FOREACH(li, &ruidlist, li_chain)
if (kp->ki_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->ki_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->ki_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 (kp->ki_ppid == (pid_t)li->li_number)
break;
if (SLIST_FIRST(&ppidlist) != NULL && li == NULL) {
selected[i] = 0;
continue;
}
SLIST_FOREACH(li, &pgrplist, li_chain)
if (kp->ki_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->ki_flag & P_CONTROLT) == 0)
break;
if (kp->ki_tdev == (dev_t)li->li_number)
break;
}
if (SLIST_FIRST(&tdevlist) != NULL && li == NULL) {
selected[i] = 0;
continue;
}
SLIST_FOREACH(li, &sidlist, li_chain)
if (kp->ki_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) {
best_tval.tv_sec = 0;
best_tval.tv_usec = 0;
bestidx = -1;
for (i = 0, kp = plist; i < nproc; i++, kp++) {
if (!selected[i])
continue;
if (kp->ki_start.tv_sec > best_tval.tv_sec ||
(kp->ki_start.tv_sec == best_tval.tv_sec
&& kp->ki_start.tv_usec > best_tval.tv_usec)) {
best_tval.tv_sec = kp->ki_start.tv_sec;
best_tval.tv_usec = kp->ki_start.tv_usec;
bestidx = i;
}
}
memset(selected, 0, 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->ki_pid == mypid)
continue;
if (selected[i]) {
if (inverse)
continue;
} else if (!inverse)
continue;
if (IS_KERNPROC(kp) != 0)
continue;
rv = 1;
(*action)(kp);
}
exit(rv ? STATUS_MATCH : STATUS_NOMATCH);
}
void
usage(void)
{
const char *ustr;
if (pgrep)
ustr = "[-flnvx] [-d delim]";
else
ustr = "[-signal] [-fnvx]";
fprintf(stderr,
"usage: %s %s [-G gid] [-M core] [-N system]\n"
" [-P ppid] [-U uid] [-g pgrp] [-s sid] [-t tty]\n"
" [-u euid] pattern ...\n", getprogname(), ustr);
exit(STATUS_ERROR);
}
void
killact(struct kinfo_proc *kp)
{
if (kill(kp->ki_pid, signum) == -1)
err(STATUS_ERROR, "signalling pid %d", (int)kp->ki_pid);
}
void
grepact(struct kinfo_proc *kp)
{
char **argv;
if (longfmt && matchargs) {
if ((argv = kvm_getargv(kd, kp, 0)) == NULL)
return;
printf("%d ", (int)kp->ki_pid);
for (; *argv != NULL; argv++) {
printf("%s", *argv);
if (argv[1] != NULL)
putchar(' ');
}
} else if (longfmt)
printf("%d %s", (int)kp->ki_pid, kp->ki_comm);
else
printf("%d", (int)kp->ki_pid);
printf("%s", delim);
}
void
makelist(struct listhead *head, enum listtype type, char *src)
{
struct list *li;
struct passwd *pw;
struct group *gr;
struct stat st;
const char *cp;
char *sp, *p, buf[MAXPATHLEN];
int empty;
empty = 1;
while ((sp = strsep(&src, ",")) != NULL) {
if (*sp == '\0')
usage();
if ((li = malloc(sizeof(*li))) == NULL)
errx(STATUS_ERROR, "memory allocation failure");
SLIST_INSERT_HEAD(head, li, li_chain);
empty = 0;
li->li_number = (uid_t)strtol(sp, &p, 0);
if (*p == '\0') {
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;
case LT_TTY:
usage();
default:
break;
}
continue;
}
switch (type) {
case LT_USER:
if ((pw = getpwnam(sp)) == NULL)
errx(STATUS_BADUSAGE, "unknown user `%s'",
optarg);
li->li_number = pw->pw_uid;
break;
case LT_GROUP:
if ((gr = getgrnam(sp)) == NULL)
errx(STATUS_BADUSAGE, "unknown group `%s'",
optarg);
li->li_number = gr->gr_gid;
break;
case LT_TTY:
if (strcmp(sp, "-") == 0) {
li->li_number = -1;
break;
} else if (strcmp(sp, "co") == 0)
cp = "console";
else if (strncmp(sp, "tty", 3) == 0)
cp = sp;
else
cp = NULL;
if (cp == NULL)
snprintf(buf, sizeof(buf), "/dev/tty%s", sp);
else
snprintf(buf, sizeof(buf), "/dev/%s", cp);
if (stat(buf, &st) < 0) {
if (errno == ENOENT)
errx(STATUS_BADUSAGE,
"no such tty: `%s'", sp);
err(STATUS_ERROR, "stat(%s)", sp);
}
if ((st.st_mode & S_IFCHR) == 0)
errx(STATUS_BADUSAGE, "not a tty: `%s'", sp);
li->li_number = st.st_rdev;
break;
default:
usage();
};
}
if (empty)
usage();
}