1 /* $NetBSD: rpc.c,v 1.18 1998/01/23 19:27:45 thorpej Exp $ */
2 /* $DragonFly: src/lib/libstand/rpc.c,v 1.3 2005/12/11 02:27:26 swildner Exp $ */
5 * Copyright (c) 1992 Regents of the University of California.
8 * This software was developed by the Computer Systems Engineering group
9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
10 * contributed to Berkeley.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp (LBL)
40 * RPC functions used by NFS and bootparams.
41 * Note that bootparams requires the ability to find out the
42 * address of the server from which its response has come.
43 * This is supported by keeping the IP/UDP headers in the
44 * buffer space provided by the caller. (See rpc_fromaddr)
47 #include <sys/param.h>
48 #include <sys/socket.h>
50 #include <netinet/in.h>
51 #include <netinet/in_systm.h>
63 int32_t authtype
; /* auth type */
64 u_int32_t authlen
; /* auth length */
69 int32_t ua_hostname
; /* null */
72 int32_t ua_gidlist
; /* null */
76 u_int32_t rp_xid
; /* request transaction id */
77 int32_t rp_direction
; /* call direction (0) */
78 u_int32_t rp_rpcvers
; /* rpc version (2) */
79 u_int32_t rp_prog
; /* program */
80 u_int32_t rp_vers
; /* version */
81 u_int32_t rp_proc
; /* procedure */
85 u_int32_t rp_xid
; /* request transaction id */
86 int32_t rp_direction
; /* call direction (1) */
87 int32_t rp_astatus
; /* accept status (0: accepted) */
91 struct auth_info rok_auth
;
98 static ssize_t
recvrpc(struct iodesc
*, void *, size_t, time_t);
99 static int rpc_getport(struct iodesc
*, n_long
, n_long
);
102 static int rpc_port
= 0x400;
107 if (rpc_port
<= 256) /* recycle after a while */
113 * Make a rpc call; return length of answer
114 * Note: Caller must leave room for headers.
117 rpc_call(struct iodesc
*d
, n_long prog
, n_long vers
, n_long proc
, void *sdata
,
118 size_t slen
, void *rdata
, size_t rlen
)
121 struct auth_info
*auth
;
122 struct rpc_call
*call
;
123 struct rpc_reply
*reply
;
124 char *send_head
, *send_tail
;
125 char *recv_head
, *recv_tail
;
127 int port
; /* host order */
131 printf("rpc_call: prog=0x%x vers=%d proc=%d\n",
135 port
= rpc_getport(d
, prog
, vers
);
139 d
->destport
= htons(port
);
142 * Prepend authorization stuff and headers.
143 * Note, must prepend things in reverse order.
146 send_tail
= (char *)sdata
+ slen
;
148 /* Auth verifier is always auth_null */
149 send_head
-= sizeof(*auth
);
150 auth
= (struct auth_info
*)send_head
;
151 auth
->authtype
= htonl(RPCAUTH_NULL
);
155 /* Auth credentials: always auth unix (as root) */
156 send_head
-= sizeof(struct auth_unix
);
157 bzero(send_head
, sizeof(struct auth_unix
));
158 send_head
-= sizeof(*auth
);
159 auth
= (struct auth_info
*)send_head
;
160 auth
->authtype
= htonl(RPCAUTH_UNIX
);
161 auth
->authlen
= htonl(sizeof(struct auth_unix
));
163 /* Auth credentials: always auth_null (XXX OK?) */
164 send_head
-= sizeof(*auth
);
166 auth
->authtype
= htonl(RPCAUTH_NULL
);
170 /* RPC call structure. */
171 send_head
-= sizeof(*call
);
172 call
= (struct rpc_call
*)send_head
;
174 call
->rp_xid
= htonl(rpc_xid
);
175 call
->rp_direction
= htonl(RPC_CALL
);
176 call
->rp_rpcvers
= htonl(RPC_VER2
);
177 call
->rp_prog
= htonl(prog
);
178 call
->rp_vers
= htonl(vers
);
179 call
->rp_proc
= htonl(proc
);
181 /* Make room for the rpc_reply header. */
183 recv_tail
= (char *)rdata
+ rlen
;
184 recv_head
-= sizeof(*reply
);
187 sendudp
, send_head
, send_tail
- send_head
,
188 recvrpc
, recv_head
, recv_tail
- recv_head
);
192 printf("callrpc: cc=%ld rlen=%lu\n", (long)cc
, (u_long
)rlen
);
197 if (cc
<= sizeof(*reply
)) {
202 recv_tail
= recv_head
+ cc
;
205 * Check the RPC reply status.
206 * The xid, dir, astatus were already checked.
208 reply
= (struct rpc_reply
*)recv_head
;
209 auth
= &reply
->rp_u
.rpu_rok
.rok_auth
;
210 x
= ntohl(auth
->authlen
);
214 printf("callrpc: reply auth != NULL\n");
219 x
= ntohl(reply
->rp_u
.rpu_rok
.rok_status
);
221 printf("callrpc: error = %ld\n", (long)x
);
225 recv_head
+= sizeof(*reply
);
227 return (ssize_t
)(recv_tail
- recv_head
);
231 * Returns true if packet is the one we're waiting for.
232 * This just checks the XID, direction, acceptance.
233 * Remaining checks are done by callrpc
236 recvrpc(struct iodesc
*d
, void *pkt
, size_t len
, time_t tleft
)
238 struct rpc_reply
*reply
;
245 printf("recvrpc: called len=%lu\n", (u_long
)len
);
248 n
= readudp(d
, pkt
, len
, tleft
);
252 reply
= (struct rpc_reply
*)pkt
;
254 x
= ntohl(reply
->rp_xid
);
258 printf("recvrpc: rp_xid %d != xid %d\n", x
, rpc_xid
);
263 x
= ntohl(reply
->rp_direction
);
264 if (x
!= RPC_REPLY
) {
267 printf("recvrpc: rp_direction %d != REPLY\n", x
);
272 x
= ntohl(reply
->rp_astatus
);
273 if (x
!= RPC_MSGACCEPTED
) {
274 errno
= ntohl(reply
->rp_u
.rpu_errno
);
275 printf("recvrpc: reject, astat=%d, errno=%d\n", x
, errno
);
279 /* Return data count (thus indicating success) */
284 * Given a pointer to a reply just received,
285 * dig out the IP address/port from the headers.
288 rpc_fromaddr(void *pkt
, struct in_addr
*addr
, u_short
*port
)
291 /* Tail of IP header: just IP addresses */
295 u_int16_t uh_sport
; /* source port */
296 u_int16_t uh_dport
; /* destination port */
297 int16_t uh_ulen
; /* udp length */
298 u_int16_t uh_sum
; /* udp checksum */
299 /* RPC reply header: */
300 struct rpc_reply rpc
;
303 hhdr
= ((struct hackhdr
*)pkt
) - 1;
304 addr
->s_addr
= hhdr
->ip_src
;
305 *port
= hhdr
->uh_sport
;
309 * RPC Portmapper cache
311 #define PMAP_NUM 8 /* need at most 5 pmap entries */
315 struct in_addr addr
; /* server, net order */
316 u_int prog
; /* host order */
317 u_int vers
; /* host order */
318 int port
; /* host order */
319 } rpc_pmap_list
[PMAP_NUM
];
322 * return port number in host order, or -1
325 * addr: server, net order
330 rpc_pmap_getcache(struct in_addr addr
, u_int prog
, u_int vers
)
332 struct pmap_list
*pl
;
334 for (pl
= rpc_pmap_list
; pl
< &rpc_pmap_list
[rpc_pmap_num
]; pl
++) {
335 if (pl
->addr
.s_addr
== addr
.s_addr
&&
336 pl
->prog
== prog
&& pl
->vers
== vers
)
346 * addr: server, net order
352 rpc_pmap_putcache(struct in_addr addr
, u_int prog
, u_int vers
, int port
)
354 struct pmap_list
*pl
;
356 /* Don't overflow cache... */
357 if (rpc_pmap_num
>= PMAP_NUM
) {
358 /* ... just re-use the last entry. */
359 rpc_pmap_num
= PMAP_NUM
- 1;
361 printf("rpc_pmap_putcache: cache overflow\n");
365 pl
= &rpc_pmap_list
[rpc_pmap_num
];
377 * Request a port number from the port mapper.
378 * Returns the port in host order.
385 rpc_getport(struct iodesc
*d
, n_long prog
, n_long vers
)
388 n_long prog
; /* call program */
389 n_long vers
; /* call version */
390 n_long proto
; /* call protocol */
391 n_long port
; /* call port (unused) */
397 n_long h
[RPC_HEADER_WORDS
];
401 n_long h
[RPC_HEADER_WORDS
];
410 printf("getport: prog=0x%x vers=%d\n", prog
, vers
);
413 /* This one is fixed forever. */
414 if (prog
== PMAPPROG
)
417 /* Try for cached answer first */
418 port
= rpc_pmap_getcache(d
->destip
, prog
, vers
);
423 args
->prog
= htonl(prog
);
424 args
->vers
= htonl(vers
);
425 args
->proto
= htonl(IPPROTO_UDP
);
429 cc
= rpc_call(d
, PMAPPROG
, PMAPVERS
, PMAPPROC_GETPORT
,
430 args
, sizeof(*args
), res
, sizeof(*res
));
431 if (cc
< sizeof(*res
)) {
432 printf("getport: %s", strerror(errno
));
436 port
= (int)ntohl(res
->port
);
438 rpc_pmap_putcache(d
->destip
, prog
, vers
, port
);