d031802b05
Use __DECONST (instead of my own attempted re-invention) for the iov parameters to jail_get/set(2). Similarly remove the decost-ish hack from execvp's argv, except the __DECONST is only added at very end. While I'm at it, remove an unused variable and fix a comment typo.
469 lines
11 KiB
C
469 lines
11 KiB
C
/*-
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* Copyright (c) 2011 James Gritton
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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/uio.h>
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#include <err.h>
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#include <stdlib.h>
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#include <string.h>
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#include "jailp.h"
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struct cfjails ready = TAILQ_HEAD_INITIALIZER(ready);
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struct cfjails depend = TAILQ_HEAD_INITIALIZER(depend);
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static void dep_add(struct cfjail *from, struct cfjail *to, unsigned flags);
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static int cmp_jailptr(const void *a, const void *b);
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static int cmp_jailptr_name(const void *a, const void *b);
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static struct cfjail *find_jail(const char *name);
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static int running_jid(const char *name, int flags);
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static struct cfjail **jails_byname;
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static size_t njails;
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/*
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* Set up jail dependency lists.
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*/
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void
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dep_setup(int docf)
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{
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struct cfjail *j, *dj;
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struct cfparam *p;
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struct cfstring *s;
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struct cfdepend *d;
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const char *cs;
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char *pname;
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size_t plen;
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int deps, ldeps;
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if (!docf) {
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/*
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* With no config file, let "depend" for a single jail
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* look at currently running jails.
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*/
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if ((j = TAILQ_FIRST(&cfjails)) &&
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(p = j->intparams[IP_DEPEND])) {
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TAILQ_FOREACH(s, &p->val, tq) {
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if (running_jid(s->s, 0) < 0) {
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warnx("depends on nonexistent jail "
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"\"%s\"", s->s);
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j->flags |= JF_FAILED;
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}
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}
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}
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return;
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}
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njails = 0;
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TAILQ_FOREACH(j, &cfjails, tq)
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njails++;
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jails_byname = emalloc(njails * sizeof(struct cfjail *));
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njails = 0;
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TAILQ_FOREACH(j, &cfjails, tq)
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jails_byname[njails++] = j;
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qsort(jails_byname, njails, sizeof(struct cfjail *), cmp_jailptr);
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deps = 0;
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ldeps = 0;
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plen = 0;
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pname = NULL;
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TAILQ_FOREACH(j, &cfjails, tq) {
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if (j->flags & JF_FAILED)
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continue;
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if ((p = j->intparams[IP_DEPEND])) {
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TAILQ_FOREACH(s, &p->val, tq) {
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dj = find_jail(s->s);
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if (dj != NULL) {
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deps++;
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dep_add(j, dj, 0);
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} else {
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jail_warnx(j,
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"depends on undefined jail \"%s\"",
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s->s);
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j->flags |= JF_FAILED;
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}
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}
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}
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/* A jail has an implied dependency on its parent. */
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if ((cs = strrchr(j->name, '.')))
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{
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if (plen < (size_t)(cs - j->name + 1)) {
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plen = (cs - j->name) + 1;
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pname = erealloc(pname, plen);
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}
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strlcpy(pname, j->name, plen);
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dj = find_jail(pname);
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if (dj != NULL) {
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ldeps++;
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dep_add(j, dj, DF_LIGHT);
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}
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}
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}
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/* Look for dependency loops. */
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if (deps && (deps > 1 || ldeps)) {
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(void)start_state(NULL, 0, 0, 0);
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while ((j = TAILQ_FIRST(&ready))) {
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requeue(j, &cfjails);
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dep_done(j, DF_NOFAIL);
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}
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while ((j = TAILQ_FIRST(&depend)) != NULL) {
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jail_warnx(j, "dependency loop");
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j->flags |= JF_FAILED;
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do {
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requeue(j, &cfjails);
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dep_done(j, DF_NOFAIL);
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} while ((j = TAILQ_FIRST(&ready)));
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}
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TAILQ_FOREACH(j, &cfjails, tq)
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STAILQ_FOREACH(d, &j->dep[DEP_FROM], tq[DEP_FROM])
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d->flags &= ~DF_SEEN;
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}
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if (pname != NULL)
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free(pname);
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}
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/*
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* Return if a jail has dependencies.
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*/
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int
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dep_check(struct cfjail *j)
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{
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int reset, depfrom, depto, ndeps, rev;
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struct cfjail *dj;
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struct cfdepend *d;
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static int bits[] = { 0, 1, 1, 2, 1, 2, 2, 3 };
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if (j->ndeps == 0)
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return 0;
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ndeps = 0;
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if ((rev = JF_DO_STOP(j->flags))) {
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depfrom = DEP_TO;
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depto = DEP_FROM;
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} else {
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depfrom = DEP_FROM;
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depto = DEP_TO;
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}
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STAILQ_FOREACH(d, &j->dep[depfrom], tq[depfrom]) {
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if (d->flags & DF_SEEN)
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continue;
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dj = d->j[depto];
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if (dj->flags & JF_FAILED) {
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if (!(j->flags & (JF_DEPEND | JF_FAILED)) &&
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verbose >= 0)
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jail_warnx(j, "skipped");
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j->flags |= JF_FAILED;
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continue;
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}
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/*
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* The dependee's state may be set (or changed) as a result of
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* being in a dependency it wasn't in earlier.
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*/
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reset = 0;
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if (bits[dj->flags & JF_OP_MASK] <= 1) {
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if (!(dj->flags & JF_OP_MASK)) {
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reset = 1;
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dj->flags |= JF_DEPEND;
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requeue(dj, &ready);
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}
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/* Set or change the dependee's state. */
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switch (j->flags & JF_OP_MASK) {
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case JF_START:
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dj->flags |= JF_START;
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break;
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case JF_SET:
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if (!(dj->flags & JF_OP_MASK))
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dj->flags |= JF_SET;
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else if (dj->flags & JF_STOP)
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dj->flags |= JF_START;
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break;
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case JF_STOP:
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case JF_RESTART:
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if (!(dj->flags & JF_STOP))
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reset = 1;
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dj->flags |= JF_STOP;
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if (dj->flags & JF_SET)
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dj->flags ^= (JF_START | JF_SET);
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break;
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}
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}
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if (reset)
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dep_reset(dj);
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if (!((d->flags & DF_LIGHT) &&
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(rev ? dj->jid < 0 : dj->jid > 0)))
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ndeps++;
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}
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if (ndeps == 0)
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return 0;
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requeue(j, &depend);
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return 1;
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}
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/*
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* Resolve any dependencies from a finished jail.
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*/
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void
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dep_done(struct cfjail *j, unsigned flags)
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{
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struct cfjail *dj;
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struct cfdepend *d;
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int depfrom, depto;
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if (JF_DO_STOP(j->flags)) {
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depfrom = DEP_TO;
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depto = DEP_FROM;
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} else {
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depfrom = DEP_FROM;
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depto = DEP_TO;
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}
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STAILQ_FOREACH(d, &j->dep[depto], tq[depto]) {
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if ((d->flags & DF_SEEN) | (flags & ~d->flags & DF_LIGHT))
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continue;
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d->flags |= DF_SEEN;
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dj = d->j[depfrom];
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if (!(flags & DF_NOFAIL) && (j->flags & JF_FAILED) &&
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(j->flags & (JF_OP_MASK | JF_DEPEND)) !=
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(JF_SET | JF_DEPEND)) {
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if (!(dj->flags & (JF_DEPEND | JF_FAILED)) &&
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verbose >= 0)
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jail_warnx(dj, "skipped");
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dj->flags |= JF_FAILED;
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}
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if (!--dj->ndeps && dj->queue == &depend)
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requeue(dj, &ready);
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}
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}
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/*
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* Count a jail's dependencies and mark them as unseen.
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*/
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void
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dep_reset(struct cfjail *j)
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{
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int depfrom;
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struct cfdepend *d;
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depfrom = JF_DO_STOP(j->flags) ? DEP_TO : DEP_FROM;
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j->ndeps = 0;
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STAILQ_FOREACH(d, &j->dep[depfrom], tq[depfrom])
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j->ndeps++;
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}
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/*
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* Find the next jail ready to do something.
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*/
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struct cfjail *
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next_jail(void)
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{
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struct cfjail *j;
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if (!(j = next_proc(!TAILQ_EMPTY(&ready))) &&
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(j = TAILQ_FIRST(&ready)) && JF_DO_STOP(j->flags) &&
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(j = TAILQ_LAST(&ready, cfjails)) && !JF_DO_STOP(j->flags)) {
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TAILQ_FOREACH_REVERSE(j, &ready, cfjails, tq)
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if (JF_DO_STOP(j->flags))
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break;
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}
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if (j != NULL)
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requeue(j, &cfjails);
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return j;
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}
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/*
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* Set jails to the proper start state.
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*/
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int
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start_state(const char *target, int docf, unsigned state, int running)
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{
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struct iovec jiov[6];
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struct cfjail *j, *tj;
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int jid;
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char namebuf[MAXHOSTNAMELEN];
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if (!target || (!docf && state != JF_STOP) ||
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(!running && !strcmp(target, "*"))) {
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/*
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* For a global wildcard (including no target specified),
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* set the state on all jails and start with those that
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* have no dependencies.
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*/
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TAILQ_FOREACH_SAFE(j, &cfjails, tq, tj) {
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j->flags = (j->flags & JF_FAILED) | state |
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(docf ? JF_WILD : 0);
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dep_reset(j);
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requeue(j, j->ndeps ? &depend : &ready);
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}
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} else if (wild_jail_name(target)) {
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/*
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* For targets specified singly, or with a non-global wildcard,
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* set their state and call them ready (even if there are
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* dependencies). Leave everything else unqueued for now.
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*/
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if (running) {
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/*
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* -R matches its wildcards against currently running
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* jails, not against the config file.
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*/
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jiov[0].iov_base = __DECONST(char *, "lastjid");
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jiov[0].iov_len = sizeof("lastjid");
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jiov[1].iov_base = &jid;
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jiov[1].iov_len = sizeof(jid);
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jiov[2].iov_base = __DECONST(char *, "jid");
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jiov[2].iov_len = sizeof("jid");
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jiov[3].iov_base = &jid;
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jiov[3].iov_len = sizeof(jid);
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jiov[4].iov_base = __DECONST(char *, "name");
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jiov[4].iov_len = sizeof("name");
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jiov[5].iov_base = &namebuf;
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jiov[5].iov_len = sizeof(namebuf);
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for (jid = 0; jail_get(jiov, 6, 0) > 0; ) {
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if (wild_jail_match(namebuf, target)) {
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j = add_jail();
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j->name = estrdup(namebuf);
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j->jid = jid;
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j->flags = (j->flags & JF_FAILED) |
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state | JF_WILD;
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dep_reset(j);
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requeue(j, &ready);
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}
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}
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} else {
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TAILQ_FOREACH_SAFE(j, &cfjails, tq, tj) {
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if (wild_jail_match(j->name, target)) {
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j->flags = (j->flags & JF_FAILED) |
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state | JF_WILD;
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dep_reset(j);
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requeue(j, &ready);
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}
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}
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}
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} else {
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j = find_jail(target);
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if (j == NULL && state == JF_STOP) {
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/* Allow -[rR] to specify a currently running jail. */
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if ((jid = running_jid(target, JAIL_DYING)) > 0) {
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j = add_jail();
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j->name = estrdup(target);
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j->jid = jid;
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}
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}
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if (j == NULL) {
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warnx("\"%s\" not found", target);
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return -1;
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}
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j->flags = (j->flags & JF_FAILED) | state;
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dep_reset(j);
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requeue(j, &ready);
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}
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return 0;
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}
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/*
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* Move a jail to a new list.
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*/
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void
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requeue(struct cfjail *j, struct cfjails *queue)
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{
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if (j->queue != queue) {
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TAILQ_REMOVE(j->queue, j, tq);
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TAILQ_INSERT_TAIL(queue, j, tq);
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j->queue = queue;
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}
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}
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/*
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* Add a dependency edge between two jails.
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*/
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static void
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dep_add(struct cfjail *from, struct cfjail *to, unsigned flags)
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{
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struct cfdepend *d;
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d = emalloc(sizeof(struct cfdepend));
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d->flags = flags;
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d->j[DEP_FROM] = from;
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d->j[DEP_TO] = to;
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STAILQ_INSERT_TAIL(&from->dep[DEP_FROM], d, tq[DEP_FROM]);
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STAILQ_INSERT_TAIL(&to->dep[DEP_TO], d, tq[DEP_TO]);
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}
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/*
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* Compare jail pointers for qsort/bsearch.
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*/
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static int
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cmp_jailptr(const void *a, const void *b)
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{
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return strcmp((*((struct cfjail * const *)a))->name,
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((*(struct cfjail * const *)b))->name);
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}
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static int
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cmp_jailptr_name(const void *a, const void *b)
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{
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return strcmp((const char *)a, ((*(struct cfjail * const *)b))->name);
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}
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/*
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* Find a jail object by name.
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*/
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static struct cfjail *
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find_jail(const char *name)
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{
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struct cfjail **jp;
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jp = bsearch(name, jails_byname, njails, sizeof(struct cfjail *),
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cmp_jailptr_name);
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return jp ? *jp : NULL;
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}
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/*
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* Return the named jail's jid if it is running, and -1 if it isn't.
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*/
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static int
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running_jid(const char *name, int flags)
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{
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struct iovec jiov[2];
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char *ep;
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int jid;
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if ((jid = strtol(name, &ep, 10)) && !*ep) {
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jiov[0].iov_base = __DECONST(char *, "jid");
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jiov[0].iov_len = sizeof("jid");
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jiov[1].iov_base = &jid;
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jiov[1].iov_len = sizeof(jid);
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} else {
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jiov[0].iov_base = __DECONST(char *, "name");
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jiov[0].iov_len = sizeof("name");
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jiov[1].iov_len = strlen(name) + 1;
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jiov[1].iov_base = alloca(jiov[1].iov_len);
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strcpy(jiov[1].iov_base, name);
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}
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return jail_get(jiov, 2, flags);
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}
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