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Don't print a warning if kill(2) returns ESRCH since the process may have
died on its own in the time between when the process list was consulted
and when we do the actual kill.  This fixes an annoyance for privsep
processes (and others) where when you kill one the others die by themselves.

/*	$OpenBSD: pkill.c,v 1.6 2004/07/15 17:15:33 millert Exp $	*/
/*	$NetBSD: pkill.c,v 1.5 2002/10/27 11:49:34 kleink 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.
 */

#ifndef lint
static const char rcsid[] = "$OpenBSD: pkill.c,v 1.6 2004/07/15 17:15:33 millert 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/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>

#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);

struct kinfo_proc2	*plist;
char	*selected;
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);
int	killact(struct kinfo_proc2 *);
int	grepact(struct kinfo_proc2 *);
void	makelist(struct listhead *, enum listtype, char *);

extern char *__progname;

int
main(int argc, char **argv)
{
	extern char *optarg;
	extern int optind;
	char buf[_POSIX2_LINE_MAX], *mstr, **pargv, *p, *q;
	int i, j, ch, bestidx, rv, criteria;
	int (*action)(struct kinfo_proc2 *);
	struct kinfo_proc2 *kp;
	struct list *li;
	u_int32_t bestsec, bestusec;
	regex_t reg;
	regmatch_t regmatch;

	if (strcmp(__progname, "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;

	while ((ch = getopt(argc, argv, "G:P:U:d:fg:lns: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 '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();

	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, "kvm_openfiles(): %s", buf);

	plist = kvm_getproc2(kd, KERN_PROC_ALL, 0, sizeof(*plist), &nproc);
	if (plist == NULL)
		errx(STATUS_ERROR, "kvm_getproc2() 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(&reg, *argv, REG_EXTENDED)) != 0) {
			regerror(rv, &reg, buf, sizeof(buf));
			errx(STATUS_BADUSAGE, "bad expression: %s", buf);
		}

		for (i = 0, kp = plist; i < nproc; i++, kp++) {
			if ((kp->p_flag & P_SYSTEM) != 0 || kp->p_pid == mypid)
				continue;

			if (matchargs) {
				if ((pargv = kvm_getargv2(kd, kp, 0)) == NULL)
					continue;

				j = 0;
				while (j < sizeof(buf) && *pargv != NULL) {
					j += snprintf(buf + j, sizeof(buf) - j,
					    pargv[1] != NULL ? "%s " : "%s",
					    pargv[0]);
					pargv++;
				}

				mstr = buf;
			} else
				mstr = kp->p_comm;

			rv = regexec(&reg, mstr, 1, &regmatch, 0);
			if (rv == 0) {
				if (fullmatch) {
					if (regmatch.rm_so == 0 &&
					    regmatch.rm_eo == strlen(mstr))
						selected[i] = 1;
				} else
					selected[i] = 1;
			} else if (rv != REG_NOMATCH) {
				regerror(rv, &reg, buf, sizeof(buf));
				errx(STATUS_ERROR, "regexec(): %s", buf);
			}
		}

		regfree(&reg);
	}

	for (i = 0, kp = plist; i < nproc; i++, kp++) {
		if ((kp->p_flag & P_SYSTEM) != 0 || kp->p_pid == mypid)
			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 (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 == (uid_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 == (uid_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;
			}
		}

		memset(selected, 0, nproc);
		if (bestidx != -1)
			selected[bestidx] = 1;
	}

	/*
	 * Take the appropriate action for each matched process, if any.
	 */
	for (i = 0, rv = STATUS_NOMATCH, kp = plist; i < nproc; i++, kp++) {
		if ((kp->p_flag & P_SYSTEM) != 0 || kp->p_pid == mypid)
			continue;
		if (selected[i]) {
			if (inverse)
				continue;
		} else if (!inverse)
			continue;

		if ((*action)(kp) == -1)
			rv = STATUS_ERROR;
		else if (rv != STATUS_ERROR)
			rv = STATUS_MATCH;
	}

	exit(rv);
}

void
usage(void)
{
	const char *ustr;

	if (pgrep)
		ustr = "[-flnvx] [-d delim]";
	else
		ustr = "[-signal] [-fnvx]";

	fprintf(stderr, "usage: %s %s [-G gid] [-P ppid] [-U uid] [-g pgrp] "
	    "[-s sid] [-t tty] [-u euid] pattern ...\n", __progname, ustr);

	exit(STATUS_ERROR);
}

int
killact(struct kinfo_proc2 *kp)
{

	if (kill(kp->p_pid, signum) == -1 && errno != ESRCH) {
		warn("signalling pid %d", (int)kp->p_pid);
		return (-1);
	}
	return (0);
}

int
grepact(struct kinfo_proc2 *kp)
{
	char **argv;

	if (longfmt && matchargs) {
		if ((argv = kvm_getargv2(kd, kp, 0)) == NULL)
			return (-1);

		printf("%d ", (int)kp->p_pid);
		for (; *argv != NULL; argv++) {
			printf("%s", *argv);
			if (argv[1] != NULL)
				putchar(' ');
		}
	} else if (longfmt)
		printf("%d %s", (int)kp->p_pid, kp->p_comm);
	else
		printf("%d", (int)kp->p_pid);

	printf("%s", delim);
	return (0);
}

void
makelist(struct listhead *head, enum listtype type, char *src)
{
	struct list *li;
	struct passwd *pw;
	struct group *gr;
	struct stat st;
	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)
				p = "console";
			else if (strncmp(sp, "tty", 3) == 0)
				p = sp;
			else
				p = NULL;

			if (p == NULL)
				snprintf(buf, sizeof(buf), "/dev/tty%s", sp);
			else
				snprintf(buf, sizeof(buf), "/dev/%s", p);

			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();
}