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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright 2025 Gleb Smirnoff <glebius@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted providing that the following conditions~
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <err.h>
#include <netinet/in.h>
#include <netlink/netlink.h>
#include <netlink/netlink_generic.h>
#include <netlink/netlink_snl.h>
#include <netlink/netlink_snl_generic.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <rpc/auth.h>
#include <rpc/clnt.h>
#include <rpc/rpc_msg.h>
#include <rpc/clnt_nl.h>
#include "genl.h"
struct nl_request_parsed {
uint32_t group;
struct nlattr *data;
};
static const struct snl_attr_parser rpcnl_attr_parser[] = {
#define OUT(field) offsetof(struct nl_request_parsed, field)
{ .type = RPCNL_REQUEST_GROUP, .off = OUT(group),
.cb = snl_attr_get_uint32 },
{ .type = RPCNL_REQUEST_BODY, .off = OUT(data), .cb = snl_attr_get_nla },
#undef OUT
};
SNL_DECLARE_PARSER(request_parser, struct genlmsghdr, snl_f_p_empty,
rpcnl_attr_parser);
void
parser_rpc(struct snl_state *ss __unused, struct nlmsghdr *hdr)
{
struct nl_request_parsed req;
struct genlmsghdr *ghdr = (struct genlmsghdr *)(hdr + 1);
XDR xdrs;
struct rpc_msg msg;
struct opaque_auth *oa;
int32_t *buf;
if (!snl_parse_nlmsg(NULL, hdr, &request_parser, &req))
errx(EXIT_FAILURE, "failed to parse RPC message");
printf("RPC %s: group %8s[0x%2x] length %4u XDR length %4u\n",
ghdr->cmd == RPCNL_REQUEST ? "request" : "unknown",
group_name(req.group), req.group,
hdr->nlmsg_len, NLA_DATA_LEN(req.data));
xdrmem_create(&xdrs, NLA_DATA(req.data), NLA_DATA_LEN(req.data),
XDR_DECODE);
if ((buf = XDR_INLINE(&xdrs, 8 * BYTES_PER_XDR_UNIT)) == NULL) {
printf("\trunt datagram\n");
return;
}
msg.rm_xid = IXDR_GET_U_INT32(buf);
msg.rm_direction = IXDR_GET_ENUM(buf, enum msg_type);
msg.rm_call.cb_rpcvers = IXDR_GET_U_INT32(buf);
msg.rm_call.cb_prog = IXDR_GET_U_INT32(buf);
msg.rm_call.cb_vers = IXDR_GET_U_INT32(buf);
msg.rm_call.cb_proc = IXDR_GET_U_INT32(buf);
printf(" %5s: xid 0x%-8x program 0x%08xv%u procedure %u\n",
msg.rm_direction == CALL ? "CALL" : "REPLY", msg.rm_xid,
msg.rm_call.cb_prog, msg.rm_call.cb_vers, msg.rm_call.cb_proc);
oa = &msg.rm_call.cb_cred;
oa->oa_flavor = IXDR_GET_ENUM(buf, enum_t);
oa->oa_length = (u_int)IXDR_GET_U_INT32(buf);
if (oa->oa_length) {
printf("\tcb_cred auth flavor %u length %u\n",
oa->oa_flavor, oa->oa_length);
/*
* Excerpt from rpc_callmsg.c, if we want to parse cb_cred better.
if (oa->oa_length > MAX_AUTH_BYTES) {
return (FALSE);
}
if (oa->oa_base == NULL) {
oa->oa_base = (caddr_t)
mem_alloc(oa->oa_length);
if (oa->oa_base == NULL)
return (FALSE);
}
buf = XDR_INLINE(&xdrs, RNDUP(oa->oa_length));
if (buf == NULL) {
if (xdr_opaque(&xdrs, oa->oa_base,
oa->oa_length) == FALSE) {
return (FALSE);
}
} else {
memmove(oa->oa_base, buf,
oa->oa_length);
}
*/
}
oa = &msg.rm_call.cb_verf;
buf = XDR_INLINE(&xdrs, 2 * BYTES_PER_XDR_UNIT);
if (buf == NULL) {
if (xdr_enum(&xdrs, &oa->oa_flavor) == FALSE ||
xdr_u_int(&xdrs, &oa->oa_length) == FALSE)
return;
} else {
oa->oa_flavor = IXDR_GET_ENUM(buf, enum_t);
oa->oa_length = (u_int)IXDR_GET_U_INT32(buf);
}
if (oa->oa_length) {
printf("\tcb_verf auth flavor %u length %u\n",
oa->oa_flavor, oa->oa_length);
/*
* Excerpt from rpc_callmsg.c, if we want to parse cb_verf better.
if (oa->oa_length > MAX_AUTH_BYTES) {
return (FALSE);
}
if (oa->oa_base == NULL) {
oa->oa_base = (caddr_t)
mem_alloc(oa->oa_length);
if (oa->oa_base == NULL)
return (FALSE);
}
buf = XDR_INLINE(&xdrs, RNDUP(oa->oa_length));
if (buf == NULL) {
if (xdr_opaque(&xdrs, oa->oa_base,
oa->oa_length) == FALSE) {
return (FALSE);
}
} else {
memmove(oa->oa_base, buf,
oa->oa_length);
}
*/
}
}
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