1de7b4b805
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
689 lines
14 KiB
C
689 lines
14 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2010 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Edward Tomasz Napierala under sponsorship
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* from the FreeBSD Foundation.
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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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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/rctl.h>
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#include <sys/sysctl.h>
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#include <assert.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 <getopt.h>
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#include <grp.h>
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#include <libutil.h>
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#include <pwd.h>
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#include <stdbool.h>
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#include <stdint.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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#define RCTL_DEFAULT_BUFSIZE 128 * 1024
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static int
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parse_user(const char *s, id_t *uidp, const char *unexpanded_rule)
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{
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char *end;
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struct passwd *pwd;
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pwd = getpwnam(s);
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if (pwd != NULL) {
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*uidp = pwd->pw_uid;
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return (0);
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}
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if (!isnumber(s[0])) {
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warnx("malformed rule '%s': unknown user '%s'",
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unexpanded_rule, s);
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return (1);
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}
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*uidp = strtod(s, &end);
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if ((size_t)(end - s) != strlen(s)) {
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warnx("malformed rule '%s': trailing characters "
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"after numerical id", unexpanded_rule);
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return (1);
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}
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return (0);
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}
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static int
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parse_group(const char *s, id_t *gidp, const char *unexpanded_rule)
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{
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char *end;
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struct group *grp;
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grp = getgrnam(s);
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if (grp != NULL) {
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*gidp = grp->gr_gid;
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return (0);
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}
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if (!isnumber(s[0])) {
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warnx("malformed rule '%s': unknown group '%s'",
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unexpanded_rule, s);
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return (1);
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}
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*gidp = strtod(s, &end);
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if ((size_t)(end - s) != strlen(s)) {
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warnx("malformed rule '%s': trailing characters "
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"after numerical id", unexpanded_rule);
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return (1);
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}
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return (0);
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}
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/*
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* Replace human-readable number with its expanded form.
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*/
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static char *
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expand_amount(const char *rule, const char *unexpanded_rule)
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{
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uint64_t num;
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const char *subject, *subject_id, *resource, *action, *amount, *per;
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char *copy, *expanded, *tofree;
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int ret;
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tofree = copy = strdup(rule);
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if (copy == NULL) {
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warn("strdup");
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return (NULL);
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}
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subject = strsep(©, ":");
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subject_id = strsep(©, ":");
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resource = strsep(©, ":");
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action = strsep(©, "=/");
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amount = strsep(©, "/");
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per = copy;
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if (amount == NULL || strlen(amount) == 0) {
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/*
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* The "copy" has already been tinkered with by strsep().
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*/
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free(tofree);
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copy = strdup(rule);
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if (copy == NULL) {
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warn("strdup");
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return (NULL);
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}
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return (copy);
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}
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assert(subject != NULL);
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assert(subject_id != NULL);
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assert(resource != NULL);
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assert(action != NULL);
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if (expand_number(amount, &num)) {
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warnx("malformed rule '%s': invalid numeric value '%s'",
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unexpanded_rule, amount);
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free(tofree);
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return (NULL);
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}
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if (per == NULL) {
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ret = asprintf(&expanded, "%s:%s:%s:%s=%ju",
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subject, subject_id, resource, action, (uintmax_t)num);
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} else {
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ret = asprintf(&expanded, "%s:%s:%s:%s=%ju/%s",
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subject, subject_id, resource, action, (uintmax_t)num, per);
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}
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if (ret <= 0) {
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warn("asprintf");
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free(tofree);
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return (NULL);
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}
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free(tofree);
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return (expanded);
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}
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static char *
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expand_rule(const char *rule, bool resolve_ids)
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{
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id_t id;
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const char *subject, *textid, *rest;
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char *copy, *expanded, *resolved, *tofree;
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int error, ret;
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tofree = copy = strdup(rule);
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if (copy == NULL) {
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warn("strdup");
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return (NULL);
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}
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subject = strsep(©, ":");
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textid = strsep(©, ":");
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if (textid == NULL) {
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warnx("malformed rule '%s': missing subject", rule);
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return (NULL);
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}
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if (copy != NULL)
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rest = copy;
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else
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rest = "";
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if (strcasecmp(subject, "u") == 0)
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subject = "user";
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else if (strcasecmp(subject, "g") == 0)
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subject = "group";
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else if (strcasecmp(subject, "p") == 0)
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subject = "process";
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else if (strcasecmp(subject, "l") == 0 ||
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strcasecmp(subject, "c") == 0 ||
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strcasecmp(subject, "class") == 0)
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subject = "loginclass";
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else if (strcasecmp(subject, "j") == 0)
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subject = "jail";
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if (resolve_ids &&
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strcasecmp(subject, "user") == 0 && strlen(textid) > 0) {
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error = parse_user(textid, &id, rule);
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if (error != 0) {
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free(tofree);
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return (NULL);
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}
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ret = asprintf(&resolved, "%s:%d:%s", subject, (int)id, rest);
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} else if (resolve_ids &&
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strcasecmp(subject, "group") == 0 && strlen(textid) > 0) {
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error = parse_group(textid, &id, rule);
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if (error != 0) {
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free(tofree);
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return (NULL);
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}
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ret = asprintf(&resolved, "%s:%d:%s", subject, (int)id, rest);
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} else {
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ret = asprintf(&resolved, "%s:%s:%s", subject, textid, rest);
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}
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if (ret <= 0) {
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warn("asprintf");
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free(tofree);
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return (NULL);
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}
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free(tofree);
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expanded = expand_amount(resolved, rule);
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free(resolved);
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return (expanded);
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}
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static char *
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humanize_ids(char *rule)
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{
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id_t id;
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struct passwd *pwd;
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struct group *grp;
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const char *subject, *textid, *rest;
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char *end, *humanized;
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int ret;
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subject = strsep(&rule, ":");
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textid = strsep(&rule, ":");
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if (textid == NULL)
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errx(1, "rule passed from the kernel didn't contain subject");
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if (rule != NULL)
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rest = rule;
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else
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rest = "";
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/* Replace numerical user and group ids with names. */
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if (strcasecmp(subject, "user") == 0) {
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id = strtod(textid, &end);
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if ((size_t)(end - textid) != strlen(textid))
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errx(1, "malformed uid '%s'", textid);
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pwd = getpwuid(id);
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if (pwd != NULL)
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textid = pwd->pw_name;
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} else if (strcasecmp(subject, "group") == 0) {
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id = strtod(textid, &end);
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if ((size_t)(end - textid) != strlen(textid))
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errx(1, "malformed gid '%s'", textid);
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grp = getgrgid(id);
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if (grp != NULL)
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textid = grp->gr_name;
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}
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ret = asprintf(&humanized, "%s:%s:%s", subject, textid, rest);
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if (ret <= 0)
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err(1, "asprintf");
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return (humanized);
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}
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static int
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str2int64(const char *str, int64_t *value)
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{
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char *end;
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if (str == NULL)
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return (EINVAL);
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*value = strtoul(str, &end, 10);
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if ((size_t)(end - str) != strlen(str))
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return (EINVAL);
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return (0);
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}
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static char *
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humanize_amount(char *rule)
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{
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int64_t num;
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const char *subject, *subject_id, *resource, *action, *amount, *per;
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char *copy, *humanized, buf[6], *tofree;
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int ret;
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tofree = copy = strdup(rule);
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if (copy == NULL)
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err(1, "strdup");
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subject = strsep(©, ":");
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subject_id = strsep(©, ":");
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resource = strsep(©, ":");
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action = strsep(©, "=/");
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amount = strsep(©, "/");
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per = copy;
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if (amount == NULL || strlen(amount) == 0 ||
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str2int64(amount, &num) != 0) {
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free(tofree);
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return (rule);
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}
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assert(subject != NULL);
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assert(subject_id != NULL);
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assert(resource != NULL);
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assert(action != NULL);
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if (humanize_number(buf, sizeof(buf), num, "", HN_AUTOSCALE,
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HN_DECIMAL | HN_NOSPACE) == -1)
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err(1, "humanize_number");
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if (per == NULL) {
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ret = asprintf(&humanized, "%s:%s:%s:%s=%s",
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subject, subject_id, resource, action, buf);
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} else {
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ret = asprintf(&humanized, "%s:%s:%s:%s=%s/%s",
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subject, subject_id, resource, action, buf, per);
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}
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if (ret <= 0)
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err(1, "asprintf");
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free(tofree);
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return (humanized);
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}
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/*
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* Print rules, one per line.
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*/
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static void
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print_rules(char *rules, int hflag, int nflag)
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{
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char *rule;
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while ((rule = strsep(&rules, ",")) != NULL) {
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if (rule[0] == '\0')
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break; /* XXX */
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if (nflag == 0)
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rule = humanize_ids(rule);
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if (hflag)
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rule = humanize_amount(rule);
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printf("%s\n", rule);
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}
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}
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static void
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enosys(void)
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{
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int error, racct_enable;
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size_t racct_enable_len;
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racct_enable_len = sizeof(racct_enable);
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error = sysctlbyname("kern.racct.enable",
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&racct_enable, &racct_enable_len, NULL, 0);
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if (error != 0) {
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if (errno == ENOENT)
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errx(1, "RACCT/RCTL support not present in kernel; see rctl(8) for details");
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err(1, "sysctlbyname");
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}
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if (racct_enable == 0)
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errx(1, "RACCT/RCTL present, but disabled; enable using kern.racct.enable=1 tunable");
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}
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static int
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add_rule(const char *rule, const char *unexpanded_rule)
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{
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int error;
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error = rctl_add_rule(rule, strlen(rule) + 1, NULL, 0);
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if (error != 0) {
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if (errno == ENOSYS)
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enosys();
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warn("failed to add rule '%s'", unexpanded_rule);
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}
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return (error);
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}
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static int
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show_limits(const char *filter, const char *unexpanded_rule,
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int hflag, int nflag)
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{
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int error;
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char *outbuf = NULL;
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size_t outbuflen = RCTL_DEFAULT_BUFSIZE / 4;
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for (;;) {
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outbuflen *= 4;
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outbuf = realloc(outbuf, outbuflen);
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if (outbuf == NULL)
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err(1, "realloc");
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error = rctl_get_limits(filter, strlen(filter) + 1,
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outbuf, outbuflen);
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if (error == 0)
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break;
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if (errno == ERANGE)
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continue;
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if (errno == ENOSYS)
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enosys();
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warn("failed to get limits for '%s'", unexpanded_rule);
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free(outbuf);
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return (error);
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}
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print_rules(outbuf, hflag, nflag);
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free(outbuf);
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return (error);
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}
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static int
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remove_rule(const char *filter, const char *unexpanded_rule)
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{
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int error;
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error = rctl_remove_rule(filter, strlen(filter) + 1, NULL, 0);
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if (error != 0) {
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if (errno == ENOSYS)
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enosys();
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warn("failed to remove rule '%s'", unexpanded_rule);
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}
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return (error);
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}
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static char *
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humanize_usage_amount(char *usage)
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{
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int64_t num;
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const char *resource, *amount;
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char *copy, *humanized, buf[6], *tofree;
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int ret;
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tofree = copy = strdup(usage);
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if (copy == NULL)
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err(1, "strdup");
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resource = strsep(©, "=");
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amount = copy;
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assert(resource != NULL);
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assert(amount != NULL);
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if (str2int64(amount, &num) != 0 ||
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humanize_number(buf, sizeof(buf), num, "", HN_AUTOSCALE,
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HN_DECIMAL | HN_NOSPACE) == -1) {
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free(tofree);
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return (usage);
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}
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ret = asprintf(&humanized, "%s=%s", resource, buf);
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if (ret <= 0)
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err(1, "asprintf");
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free(tofree);
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return (humanized);
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}
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/*
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* Query the kernel about a resource usage and print it out.
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*/
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static int
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show_usage(const char *filter, const char *unexpanded_rule, int hflag)
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{
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int error;
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char *copy, *outbuf = NULL, *tmp;
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size_t outbuflen = RCTL_DEFAULT_BUFSIZE / 4;
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for (;;) {
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outbuflen *= 4;
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outbuf = realloc(outbuf, outbuflen);
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if (outbuf == NULL)
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err(1, "realloc");
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error = rctl_get_racct(filter, strlen(filter) + 1,
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outbuf, outbuflen);
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if (error == 0)
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break;
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if (errno == ERANGE)
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continue;
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if (errno == ENOSYS)
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enosys();
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warn("failed to show resource consumption for '%s'",
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unexpanded_rule);
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free(outbuf);
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return (error);
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}
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copy = outbuf;
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while ((tmp = strsep(©, ",")) != NULL) {
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if (tmp[0] == '\0')
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break; /* XXX */
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if (hflag)
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tmp = humanize_usage_amount(tmp);
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printf("%s\n", tmp);
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}
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free(outbuf);
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return (error);
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}
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/*
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* Query the kernel about resource limit rules and print them out.
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*/
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static int
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show_rules(const char *filter, const char *unexpanded_rule,
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int hflag, int nflag)
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{
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int error;
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char *outbuf = NULL;
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size_t filterlen, outbuflen = RCTL_DEFAULT_BUFSIZE / 4;
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if (filter != NULL)
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filterlen = strlen(filter) + 1;
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else
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filterlen = 0;
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for (;;) {
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outbuflen *= 4;
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outbuf = realloc(outbuf, outbuflen);
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|
if (outbuf == NULL)
|
|
err(1, "realloc");
|
|
error = rctl_get_rules(filter, filterlen, outbuf, outbuflen);
|
|
if (error == 0)
|
|
break;
|
|
if (errno == ERANGE)
|
|
continue;
|
|
if (errno == ENOSYS)
|
|
enosys();
|
|
warn("failed to show rules for '%s'", unexpanded_rule);
|
|
free(outbuf);
|
|
|
|
return (error);
|
|
}
|
|
|
|
print_rules(outbuf, hflag, nflag);
|
|
free(outbuf);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
|
|
fprintf(stderr, "usage: rctl [ -h ] [-a rule | -l filter | -r filter "
|
|
"| -u filter | filter]\n");
|
|
exit(1);
|
|
}
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
int ch, aflag = 0, hflag = 0, nflag = 0, lflag = 0, rflag = 0,
|
|
uflag = 0;
|
|
char *rule = NULL, *unexpanded_rule;
|
|
int i, cumulated_error, error;
|
|
|
|
while ((ch = getopt(argc, argv, "ahlnru")) != -1) {
|
|
switch (ch) {
|
|
case 'a':
|
|
aflag = 1;
|
|
break;
|
|
case 'h':
|
|
hflag = 1;
|
|
break;
|
|
case 'l':
|
|
lflag = 1;
|
|
break;
|
|
case 'n':
|
|
nflag = 1;
|
|
break;
|
|
case 'r':
|
|
rflag = 1;
|
|
break;
|
|
case 'u':
|
|
uflag = 1;
|
|
break;
|
|
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
}
|
|
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (aflag + lflag + rflag + uflag > 1)
|
|
errx(1, "at most one of -a, -l, -r, or -u may be specified");
|
|
|
|
if (argc == 0) {
|
|
if (aflag + lflag + rflag + uflag == 0) {
|
|
rule = strdup("::");
|
|
show_rules(rule, rule, hflag, nflag);
|
|
|
|
return (0);
|
|
}
|
|
|
|
usage();
|
|
}
|
|
|
|
cumulated_error = 0;
|
|
|
|
for (i = 0; i < argc; i++) {
|
|
unexpanded_rule = argv[i];
|
|
|
|
/*
|
|
* Skip resolving if passed -n _and_ -a. Ignore -n otherwise,
|
|
* so we can still do "rctl -n u:root" and see the rules without
|
|
* resolving the UID.
|
|
*/
|
|
if (aflag != 0 && nflag != 0)
|
|
rule = expand_rule(unexpanded_rule, false);
|
|
else
|
|
rule = expand_rule(unexpanded_rule, true);
|
|
|
|
if (rule == NULL) {
|
|
cumulated_error++;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* The reason for passing the unexpanded_rule is to make
|
|
* it easier for the user to search for the problematic
|
|
* rule in the passed input.
|
|
*/
|
|
if (aflag) {
|
|
error = add_rule(rule, unexpanded_rule);
|
|
} else if (lflag) {
|
|
error = show_limits(rule, unexpanded_rule,
|
|
hflag, nflag);
|
|
} else if (rflag) {
|
|
error = remove_rule(rule, unexpanded_rule);
|
|
} else if (uflag) {
|
|
error = show_usage(rule, unexpanded_rule, hflag);
|
|
} else {
|
|
error = show_rules(rule, unexpanded_rule,
|
|
hflag, nflag);
|
|
}
|
|
|
|
if (error != 0)
|
|
cumulated_error++;
|
|
|
|
free(rule);
|
|
}
|
|
|
|
return (cumulated_error);
|
|
}
|