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129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2003 Poul-Henning Kamp
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* All rights reserved.
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* Copyright (c) 2022 Alexander Motin <mav@FreeBSD.org>
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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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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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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/types.h>
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#include <sys/sysctl.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libgeom.h"
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/*
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* Amount of extra space we allocate to try and anticipate the size of
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* confxml.
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*/
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#define GEOM_GETXML_SLACK 4096
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/*
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* Number of times to retry in the face of the size of confxml exceeding
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* that of our buffer.
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*/
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#define GEOM_GETXML_RETRIES 4
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/*
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* Size of confxml buffer to request via getxml control request. It is
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* expected to be sufficient for single geom and its parents. In case of
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* overflow fall back to requesting full confxml via sysctl interface.
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*/
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#define GEOM_GETXML_BUFFER 65536
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char *
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geom_getxml(void)
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{
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char *p;
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size_t l = 0;
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int mib[3];
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size_t sizep;
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int retries;
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sizep = sizeof(mib) / sizeof(*mib);
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if (sysctlnametomib("kern.geom.confxml", mib, &sizep) != 0)
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return (NULL);
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if (sysctl(mib, sizep, NULL, &l, NULL, 0) != 0)
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return (NULL);
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l += GEOM_GETXML_SLACK;
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for (retries = 0; retries < GEOM_GETXML_RETRIES; retries++) {
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p = malloc(l);
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if (p == NULL)
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return (NULL);
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if (sysctl(mib, sizep, p, &l, NULL, 0) == 0)
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return (reallocf(p, strlen(p) + 1));
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free(p);
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if (errno != ENOMEM)
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return (NULL);
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/*
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* Our buffer wasn't big enough. Make it bigger and
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* try again.
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*/
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l *= 2;
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}
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return (NULL);
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}
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char *
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geom_getxml_geom(const char *class, const char *geom, int parents)
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{
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struct gctl_req *r;
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char *p;
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const char *errstr;
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int nargs = 0;
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p = malloc(GEOM_GETXML_BUFFER);
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if (p == NULL)
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return (NULL);
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r = gctl_get_handle();
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gctl_ro_param(r, "class", -1, class);
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gctl_ro_param(r, "verb", -1, "getxml");
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gctl_ro_param(r, "parents", sizeof(parents), &parents);
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if (geom) {
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gctl_ro_param(r, "arg0", -1, geom);
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nargs = 1;
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}
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gctl_ro_param(r, "nargs", sizeof(nargs), &nargs);
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p[0] = '\0';
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gctl_add_param(r, "output", GEOM_GETXML_BUFFER, p,
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GCTL_PARAM_WR | GCTL_PARAM_ASCII);
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errstr = gctl_issue(r);
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if (errstr != NULL && errstr[0] != '\0') {
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gctl_free(r);
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free(p);
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return (geom_getxml());
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}
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gctl_free(r);
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return (p);
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}
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