1 /* $NetBSD: rpc.c,v 1.18 1998/01/23 19:27:45 thorpej Exp $ */
4 * Copyright (c) 1992 Regents of the University of California.
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp (LBL)
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
42 * RPC functions used by NFS and bootparams.
43 * Note that bootparams requires the ability to find out the
44 * address of the server from which its response has come.
45 * This is supported by keeping the IP/UDP headers in the
46 * buffer space provided by the caller. (See rpc_fromaddr)
49 #include <sys/param.h>
50 #include <sys/socket.h>
52 #include <netinet/in.h>
53 #include <netinet/in_systm.h>
65 int32_t authtype; /* auth type */
66 uint32_t authlen; /* auth length */
71 int32_t ua_hostname; /* null */
74 int32_t ua_gidlist; /* null */
78 uint32_t rp_xid; /* request transaction id */
79 int32_t rp_direction; /* call direction (0) */
80 uint32_t rp_rpcvers; /* rpc version (2) */
81 uint32_t rp_prog; /* program */
82 uint32_t rp_vers; /* version */
83 uint32_t rp_proc; /* procedure */
87 uint32_t rp_xid; /* request transaction id */
88 int32_t rp_direction; /* call direction (1) */
89 int32_t rp_astatus; /* accept status (0: accepted) */
93 struct auth_info rok_auth;
100 static ssize_t recvrpc(struct iodesc *, void **, void **, time_t, void *);
101 static int rpc_getport(struct iodesc *, n_long, n_long);
104 int rpc_port = 0x400; /* predecrement */
107 * Make a rpc call; return length of answer
108 * Note: Caller must leave room for headers.
111 rpc_call(struct iodesc *d, n_long prog, n_long vers, n_long proc,
112 void *sdata, size_t slen, void **rdata, void **pkt)
115 struct auth_info *auth;
116 struct rpc_call *call;
117 struct rpc_reply *reply;
118 char *send_head, *send_tail;
121 int port; /* host order */
125 printf("rpc_call: prog=0x%x vers=%d proc=%d\n",
129 port = rpc_getport(d, prog, vers);
133 d->destport = htons(port);
136 * Prepend authorization stuff and headers.
137 * Note, must prepend things in reverse order.
140 send_tail = (char *)sdata + slen;
142 /* Auth verifier is always auth_null */
143 send_head -= sizeof(*auth);
144 auth = (struct auth_info *)send_head;
145 auth->authtype = htonl(RPCAUTH_NULL);
148 /* Auth credentials: always auth unix (as root) */
149 send_head -= sizeof(struct auth_unix);
150 bzero(send_head, sizeof(struct auth_unix));
151 send_head -= sizeof(*auth);
152 auth = (struct auth_info *)send_head;
153 auth->authtype = htonl(RPCAUTH_UNIX);
154 auth->authlen = htonl(sizeof(struct auth_unix));
156 /* RPC call structure. */
157 send_head -= sizeof(*call);
158 call = (struct rpc_call *)send_head;
160 call->rp_xid = htonl(rpc_xid);
161 call->rp_direction = htonl(RPC_CALL);
162 call->rp_rpcvers = htonl(RPC_VER2);
163 call->rp_prog = htonl(prog);
164 call->rp_vers = htonl(vers);
165 call->rp_proc = htonl(proc);
169 sendudp, send_head, send_tail - send_head,
170 recvrpc, &ptr, (void **)&reply, NULL);
174 printf("callrpc: cc=%zd\n", cc);
179 if (cc <= sizeof(*reply)) {
186 * Check the RPC reply status.
187 * The xid, dir, astatus were already checked.
189 auth = &reply->rp_u.rpu_rok.rok_auth;
190 x = ntohl(auth->authlen);
194 printf("callrpc: reply auth != NULL\n");
200 x = ntohl(reply->rp_u.rpu_rok.rok_status);
202 printf("callrpc: error = %ld\n", (long)x);
208 rsize = cc - sizeof(*reply);
209 *rdata = (void *)((uintptr_t)reply + sizeof(*reply));
215 * Returns true if packet is the one we're waiting for.
216 * This just checks the XID, direction, acceptance.
217 * Remaining checks are done by callrpc
220 recvrpc(struct iodesc *d, void **pkt, void **payload, time_t tleft, void *extra)
223 struct rpc_reply *reply;
230 printf("recvrpc: called\n");
234 n = readudp(d, &ptr, (void **)&reply, tleft);
240 x = ntohl(reply->rp_xid);
244 printf("recvrpc: rp_xid %d != xid %d\n", x, rpc_xid);
250 x = ntohl(reply->rp_direction);
251 if (x != RPC_REPLY) {
254 printf("recvrpc: rp_direction %d != REPLY\n", x);
260 x = ntohl(reply->rp_astatus);
261 if (x != RPC_MSGACCEPTED) {
262 errno = ntohl(reply->rp_u.rpu_errno);
263 printf("recvrpc: reject, astat=%d, errno=%d\n", x, errno);
270 /* Return data count (thus indicating success) */
275 * Given a pointer to a reply just received,
276 * dig out the IP address/port from the headers.
279 rpc_fromaddr(void *pkt, struct in_addr *addr, u_short *port)
282 /* Tail of IP header: just IP addresses */
286 uint16_t uh_sport; /* source port */
287 uint16_t uh_dport; /* destination port */
288 int16_t uh_ulen; /* udp length */
289 uint16_t uh_sum; /* udp checksum */
290 /* RPC reply header: */
291 struct rpc_reply rpc;
294 hhdr = ((struct hackhdr *)pkt) - 1;
295 addr->s_addr = hhdr->ip_src;
296 *port = hhdr->uh_sport;
300 * RPC Portmapper cache
302 #define PMAP_NUM 8 /* need at most 5 pmap entries */
306 struct in_addr addr; /* server, net order */
307 u_int prog; /* host order */
308 u_int vers; /* host order */
309 int port; /* host order */
310 } rpc_pmap_list[PMAP_NUM];
313 * return port number in host order, or -1.
315 * addr .. server, net order.
316 * prog .. host order.
317 * vers .. host order.
320 rpc_pmap_getcache(struct in_addr addr, u_int prog, u_int vers)
322 struct pmap_list *pl;
324 for (pl = rpc_pmap_list; pl < &rpc_pmap_list[rpc_pmap_num]; pl++) {
325 if (pl->addr.s_addr == addr.s_addr &&
326 pl->prog == prog && pl->vers == vers )
336 * addr .. server, net order.
337 * prog .. host order.
338 * vers .. host order.
339 * port .. host order.
342 rpc_pmap_putcache(struct in_addr addr, u_int prog, u_int vers, int port)
344 struct pmap_list *pl;
346 /* Don't overflow cache... */
347 if (rpc_pmap_num >= PMAP_NUM) {
348 /* ... just re-use the last entry. */
349 rpc_pmap_num = PMAP_NUM - 1;
351 printf("rpc_pmap_putcache: cache overflow\n");
355 pl = &rpc_pmap_list[rpc_pmap_num];
367 * Request a port number from the port mapper.
368 * Returns the port in host order.
369 * prog and vers are host order.
372 rpc_getport(struct iodesc *d, n_long prog, n_long vers)
375 n_long prog; /* call program */
376 n_long vers; /* call version */
377 n_long proto; /* call protocol */
378 n_long port; /* call port (unused) */
384 n_long h[RPC_HEADER_WORDS];
393 printf("%s: prog=0x%x vers=%d\n", __func__, prog, vers);
396 /* This one is fixed forever. */
397 if (prog == PMAPPROG) {
402 /* Try for cached answer first */
403 port = rpc_pmap_getcache(d->destip, prog, vers);
408 args->prog = htonl(prog);
409 args->vers = htonl(vers);
410 args->proto = htonl(IPPROTO_UDP);
414 cc = rpc_call(d, PMAPPROG, PMAPVERS, PMAPPROC_GETPORT,
415 args, sizeof(*args), (void **)&res, &pkt);
416 if (cc < sizeof(*res)) {
417 printf("getport: %s", strerror(errno));
422 port = (int)ntohl(res->port);
425 rpc_pmap_putcache(d->destip, prog, vers, port);
430 printf("%s: port=%u\n", __func__, port);