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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.
109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
/*-
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* Copyright (c) 2009 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/param.h>
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#include <sys/types.h>
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#include <sys/jail.h>
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#include <sys/uio.h>
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#include <errno.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 "jail.h"
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/*
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* Return the JID corresponding to a jail name.
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*/
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int
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jail_getid(const char *name)
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{
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char *ep;
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int jid;
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struct iovec jiov[4];
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jid = strtoul(name, &ep, 10);
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if (*name && !*ep)
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return jid;
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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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jiov[2].iov_base = __DECONST(char *, "errmsg");
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jiov[2].iov_len = sizeof("errmsg");
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jiov[3].iov_base = jail_errmsg;
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jiov[3].iov_len = JAIL_ERRMSGLEN;
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jail_errmsg[0] = 0;
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jid = jail_get(jiov, 4, 0);
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if (jid < 0 && !jail_errmsg[0])
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snprintf(jail_errmsg, JAIL_ERRMSGLEN, "jail_get: %s",
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strerror(errno));
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return jid;
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}
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/*
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* Return the name corresponding to a JID.
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*/
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char *
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jail_getname(int jid)
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{
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struct iovec jiov[6];
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char *name;
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char namebuf[MAXHOSTNAMELEN];
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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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jiov[2].iov_base = __DECONST(char *, "name");
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jiov[2].iov_len = sizeof("name");
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jiov[3].iov_base = namebuf;
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jiov[3].iov_len = sizeof(namebuf);
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jiov[4].iov_base = __DECONST(char *, "errmsg");
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jiov[4].iov_len = sizeof("errmsg");
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jiov[5].iov_base = jail_errmsg;
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jiov[5].iov_len = JAIL_ERRMSGLEN;
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jail_errmsg[0] = 0;
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jid = jail_get(jiov, 6, 0);
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if (jid < 0) {
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if (!jail_errmsg[0])
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snprintf(jail_errmsg, JAIL_ERRMSGLEN, "jail_get: %s",
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strerror(errno));
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return NULL;
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} else {
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name = strdup(namebuf);
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if (name == NULL)
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strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN);
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}
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return name;
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}
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