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94dc571595
Create a casper service for netdb functions. Initially only cap_getprotobyname is implemented. This is needed for capsicumizing sockstat. Reviewed by: oshogbo, bcr (manpages) Relnotes: yes Differential Revision: https://reviews.freebsd.org/D24832
155 lines
3.8 KiB
C
155 lines
3.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2020 Ryan Moeller <freqlabs@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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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/dnv.h>
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#include <sys/nv.h>
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#include <netinet/in.h>
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#include <assert.h>
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#include <errno.h>
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#include <netdb.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <libcasper.h>
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#include <libcasper_service.h>
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#include "cap_netdb.h"
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static struct protoent *
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protoent_unpack(nvlist_t *nvl)
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{
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struct protoent *pp;
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char **aliases;
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size_t n;
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pp = malloc(sizeof(*pp));
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if (pp == NULL) {
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nvlist_destroy(nvl);
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return (NULL);
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}
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pp->p_name = nvlist_take_string(nvl, "name");
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aliases = nvlist_take_string_array(nvl, "aliases", &n);
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pp->p_aliases = realloc(aliases, sizeof(char *) * (n + 1));
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if (pp->p_aliases == NULL) {
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while (n-- > 0)
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free(aliases[n]);
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free(aliases);
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free(pp->p_name);
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free(pp);
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nvlist_destroy(nvl);
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return (NULL);
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}
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pp->p_aliases[n] = NULL;
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pp->p_proto = (int)nvlist_take_number(nvl, "proto");
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nvlist_destroy(nvl);
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return (pp);
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}
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struct protoent *
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cap_getprotobyname(cap_channel_t *chan, const char *name)
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{
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nvlist_t *nvl;
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nvl = nvlist_create(0);
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nvlist_add_string(nvl, "cmd", "getprotobyname");
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nvlist_add_string(nvl, "name", name);
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nvl = cap_xfer_nvlist(chan, nvl);
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if (nvl == NULL)
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return (NULL);
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if (dnvlist_get_number(nvl, "error", 0) != 0) {
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nvlist_destroy(nvl);
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return (NULL);
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}
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return (protoent_unpack(nvl));
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}
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static void
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protoent_pack(const struct protoent *pp, nvlist_t *nvl)
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{
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int n = 0;
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nvlist_add_string(nvl, "name", pp->p_name);
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while (pp->p_aliases[n] != NULL)
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++n;
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nvlist_add_string_array(nvl, "aliases",
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(const char * const *)pp->p_aliases, n);
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nvlist_add_number(nvl, "proto", (uint64_t)pp->p_proto);
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}
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static int
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netdb_getprotobyname(const nvlist_t *limits __unused, const nvlist_t *nvlin,
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nvlist_t *nvlout)
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{
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const char *name;
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struct protoent *pp;
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name = dnvlist_get_string(nvlin, "name", NULL);
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if (name == NULL)
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return (EDOOFUS);
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pp = getprotobyname(name);
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if (pp == NULL)
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return (EINVAL);
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protoent_pack(pp, nvlout);
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return (0);
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}
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static int
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netdb_limit(const nvlist_t *oldlimits __unused,
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const nvlist_t *newlimits __unused)
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{
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return (0);
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}
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static int
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netdb_command(const char *cmd, const nvlist_t *limits, nvlist_t *nvlin,
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nvlist_t *nvlout)
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{
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int error;
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if (strcmp(cmd, "getprotobyname") == 0)
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error = netdb_getprotobyname(limits, nvlin, nvlout);
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else
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error = NO_RECOVERY;
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return (error);
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}
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CREATE_SERVICE("system.netdb", netdb_limit, netdb_command, 0);
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