40bcb503f1
Free can properly handle NULL pointer (but keep free() call on the premise that the code might be reused). Show errno when realloc failed. MFC after: 3 days
425 lines
9.2 KiB
C
425 lines
9.2 KiB
C
/*-
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* Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org>
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* Copyright (c) 2000 Paul Saab <ps@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/jail.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <sys/user.h>
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#include <sys/sysctl.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <jail.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pwd.h>
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#include <signal.h>
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#include <regex.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <unistd.h>
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#include <locale.h>
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static void __dead2
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usage(void)
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{
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fprintf(stderr, "usage: killall [-delmsvz] [-help] [-I] [-j jail]\n");
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fprintf(stderr,
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" [-u user] [-t tty] [-c cmd] [-SIGNAL] [cmd]...\n");
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fprintf(stderr, "At least one option or argument to specify processes must be given.\n");
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exit(1);
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}
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static void
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printsig(FILE *fp)
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{
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const char *const * p;
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int cnt;
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int offset = 0;
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for (cnt = NSIG, p = sys_signame + 1; --cnt; ++p) {
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offset += fprintf(fp, "%s ", *p);
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if (offset >= 75 && cnt > 1) {
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offset = 0;
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fprintf(fp, "\n");
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}
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}
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fprintf(fp, "\n");
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}
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static void
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nosig(char *name)
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{
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warnx("unknown signal %s; valid signals:", name);
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printsig(stderr);
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exit(1);
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}
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int
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main(int ac, char **av)
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{
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struct kinfo_proc *procs, *newprocs;
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struct stat sb;
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struct passwd *pw;
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regex_t rgx;
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regmatch_t pmatch;
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int i, j, ch;
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char buf[256];
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char first;
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char *user = NULL;
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char *tty = NULL;
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char *cmd = NULL;
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int vflag = 0;
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int sflag = 0;
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int dflag = 0;
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int eflag = 0;
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int Iflag = 0;
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int jflag = 0;
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int mflag = 0;
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int zflag = 0;
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uid_t uid = 0;
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dev_t tdev = 0;
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pid_t mypid;
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char thiscmd[MAXCOMLEN + 1];
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pid_t thispid;
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uid_t thisuid;
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dev_t thistdev;
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int sig = SIGTERM;
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const char *const *p;
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char *ep;
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int errors = 0;
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int jid;
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int mib[4];
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size_t miblen;
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int st, nprocs;
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size_t size;
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int matched;
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int killed = 0;
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setlocale(LC_ALL, "");
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av++;
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ac--;
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while (ac > 0) {
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if (strcmp(*av, "-l") == 0) {
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printsig(stdout);
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exit(0);
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}
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if (strcmp(*av, "-help") == 0)
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usage();
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if (**av == '-') {
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++*av;
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switch (**av) {
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case 'I':
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Iflag = 1;
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break;
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case 'j':
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++*av;
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if (**av == '\0') {
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++av;
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--ac;
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}
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jflag++;
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if (*av == NULL)
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errx(1, "must specify jail");
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jid = jail_getid(*av);
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if (jid < 0)
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errx(1, "%s", jail_errmsg);
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if (jail_attach(jid) == -1)
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err(1, "jail_attach(%d)", jid);
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break;
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case 'u':
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++*av;
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if (**av == '\0') {
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++av;
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--ac;
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}
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if (*av == NULL)
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errx(1, "must specify user");
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user = *av;
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break;
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case 't':
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++*av;
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if (**av == '\0') {
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++av;
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--ac;
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}
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if (*av == NULL)
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errx(1, "must specify tty");
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tty = *av;
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break;
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case 'c':
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++*av;
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if (**av == '\0') {
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++av;
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--ac;
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}
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if (*av == NULL)
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errx(1, "must specify procname");
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cmd = *av;
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break;
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case 'v':
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vflag++;
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break;
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case 's':
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sflag++;
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break;
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case 'd':
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dflag++;
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break;
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case 'e':
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eflag++;
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break;
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case 'm':
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mflag++;
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break;
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case 'z':
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zflag++;
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break;
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default:
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if (isalpha((unsigned char)**av)) {
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if (strncasecmp(*av, "SIG", 3) == 0)
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*av += 3;
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for (sig = NSIG, p = sys_signame + 1;
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--sig; ++p)
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if (strcasecmp(*p, *av) == 0) {
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sig = p - sys_signame;
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break;
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}
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if (!sig)
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nosig(*av);
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} else if (isdigit((unsigned char)**av)) {
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sig = strtol(*av, &ep, 10);
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if (!*av || *ep)
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errx(1, "illegal signal number: %s", *av);
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if (sig < 0 || sig >= NSIG)
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nosig(*av);
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} else
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nosig(*av);
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}
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++av;
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--ac;
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} else {
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break;
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}
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}
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if (user == NULL && tty == NULL && cmd == NULL && !jflag && ac == 0)
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usage();
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if (tty) {
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if (strncmp(tty, "/dev/", 5) == 0)
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snprintf(buf, sizeof(buf), "%s", tty);
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else if (strncmp(tty, "tty", 3) == 0)
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snprintf(buf, sizeof(buf), "/dev/%s", tty);
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else
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snprintf(buf, sizeof(buf), "/dev/tty%s", tty);
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if (stat(buf, &sb) < 0)
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err(1, "stat(%s)", buf);
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if (!S_ISCHR(sb.st_mode))
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errx(1, "%s: not a character device", buf);
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tdev = sb.st_rdev;
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if (dflag)
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printf("ttydev:0x%x\n", tdev);
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}
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if (user) {
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uid = strtol(user, &ep, 10);
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if (*user == '\0' || *ep != '\0') { /* was it a number? */
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pw = getpwnam(user);
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if (pw == NULL)
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errx(1, "user %s does not exist", user);
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uid = pw->pw_uid;
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if (dflag)
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printf("uid:%d\n", uid);
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}
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} else {
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uid = getuid();
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if (uid != 0) {
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pw = getpwuid(uid);
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if (pw)
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user = pw->pw_name;
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if (dflag)
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printf("uid:%d\n", uid);
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}
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}
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size = 0;
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC;
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mib[2] = KERN_PROC_PROC;
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mib[3] = 0;
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miblen = 3;
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if (user) {
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mib[2] = eflag ? KERN_PROC_UID : KERN_PROC_RUID;
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mib[3] = uid;
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miblen = 4;
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} else if (tty) {
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mib[2] = KERN_PROC_TTY;
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mib[3] = tdev;
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miblen = 4;
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}
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procs = NULL;
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st = sysctl(mib, miblen, NULL, &size, NULL, 0);
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do {
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size += size / 10;
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newprocs = realloc(procs, size);
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if (newprocs == NULL) {
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free(procs);
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err(1, "could not reallocate memory");
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}
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procs = newprocs;
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st = sysctl(mib, miblen, procs, &size, NULL, 0);
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} while (st == -1 && errno == ENOMEM);
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if (st == -1)
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err(1, "could not sysctl(KERN_PROC)");
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if (size % sizeof(struct kinfo_proc) != 0) {
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fprintf(stderr, "proc size mismatch (%zu total, %zu chunks)\n",
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size, sizeof(struct kinfo_proc));
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fprintf(stderr, "userland out of sync with kernel, recompile libkvm etc\n");
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exit(1);
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}
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nprocs = size / sizeof(struct kinfo_proc);
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if (dflag)
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printf("nprocs %d\n", nprocs);
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mypid = getpid();
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for (i = 0; i < nprocs; i++) {
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if ((procs[i].ki_stat & SZOMB) == SZOMB && !zflag)
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continue;
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thispid = procs[i].ki_pid;
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strlcpy(thiscmd, procs[i].ki_comm, sizeof(thiscmd));
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thistdev = procs[i].ki_tdev;
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if (eflag)
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thisuid = procs[i].ki_uid; /* effective uid */
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else
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thisuid = procs[i].ki_ruid; /* real uid */
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if (thispid == mypid)
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continue;
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matched = 1;
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if (user) {
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if (thisuid != uid)
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matched = 0;
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}
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if (tty) {
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if (thistdev != tdev)
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matched = 0;
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}
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if (cmd) {
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if (mflag) {
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if (regcomp(&rgx, cmd,
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REG_EXTENDED|REG_NOSUB) != 0) {
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mflag = 0;
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warnx("%s: illegal regexp", cmd);
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}
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}
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if (mflag) {
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pmatch.rm_so = 0;
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pmatch.rm_eo = strlen(thiscmd);
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if (regexec(&rgx, thiscmd, 0, &pmatch,
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REG_STARTEND) != 0)
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matched = 0;
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regfree(&rgx);
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} else {
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if (strncmp(thiscmd, cmd, MAXCOMLEN) != 0)
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matched = 0;
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}
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}
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if (jflag && thispid == getpid())
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matched = 0;
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if (matched == 0)
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continue;
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if (ac > 0)
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matched = 0;
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for (j = 0; j < ac; j++) {
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if (mflag) {
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if (regcomp(&rgx, av[j],
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REG_EXTENDED|REG_NOSUB) != 0) {
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mflag = 0;
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warnx("%s: illegal regexp", av[j]);
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}
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}
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if (mflag) {
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pmatch.rm_so = 0;
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pmatch.rm_eo = strlen(thiscmd);
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if (regexec(&rgx, thiscmd, 0, &pmatch,
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REG_STARTEND) == 0)
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matched = 1;
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regfree(&rgx);
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} else {
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if (strcmp(thiscmd, av[j]) == 0)
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matched = 1;
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}
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if (matched)
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break;
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}
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if (matched != 0 && Iflag) {
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printf("Send signal %d to %s (pid %d uid %d)? ",
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sig, thiscmd, thispid, thisuid);
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fflush(stdout);
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first = ch = getchar();
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while (ch != '\n' && ch != EOF)
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ch = getchar();
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if (first != 'y' && first != 'Y')
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matched = 0;
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}
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if (matched == 0)
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continue;
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if (dflag)
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printf("sig:%d, cmd:%s, pid:%d, dev:0x%x uid:%d\n", sig,
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thiscmd, thispid, thistdev, thisuid);
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if (vflag || sflag)
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printf("kill -%s %d\n", sys_signame[sig], thispid);
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killed++;
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if (!dflag && !sflag) {
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if (kill(thispid, sig) < 0 /* && errno != ESRCH */ ) {
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warn("warning: kill -%s %d",
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sys_signame[sig], thispid);
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errors = 1;
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}
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}
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}
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if (killed == 0) {
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fprintf(stderr, "No matching processes %swere found\n",
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getuid() != 0 ? "belonging to you " : "");
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errors = 1;
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}
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exit(errors);
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}
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