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 u_int32_t authlen; /* auth length */
71 int32_t ua_hostname; /* null */
74 int32_t ua_gidlist; /* null */
78 u_int32_t rp_xid; /* request transaction id */
79 int32_t rp_direction; /* call direction (0) */
80 u_int32_t rp_rpcvers; /* rpc version (2) */
81 u_int32_t rp_prog; /* program */
82 u_int32_t rp_vers; /* version */
83 u_int32_t rp_proc; /* procedure */
87 u_int32_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 *, size_t, time_t);
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, size_t rlen)
115 struct auth_info *auth;
116 struct rpc_call *call;
117 struct rpc_reply *reply;
118 char *send_head, *send_tail;
119 char *recv_head, *recv_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);
149 /* Auth credentials: always auth unix (as root) */
150 send_head -= sizeof(struct auth_unix);
151 bzero(send_head, sizeof(struct auth_unix));
152 send_head -= sizeof(*auth);
153 auth = (struct auth_info *)send_head;
154 auth->authtype = htonl(RPCAUTH_UNIX);
155 auth->authlen = htonl(sizeof(struct auth_unix));
157 /* Auth credentials: always auth_null (XXX OK?) */
158 send_head -= sizeof(*auth);
160 auth->authtype = htonl(RPCAUTH_NULL);
164 /* RPC call structure. */
165 send_head -= sizeof(*call);
166 call = (struct rpc_call *)send_head;
168 call->rp_xid = htonl(rpc_xid);
169 call->rp_direction = htonl(RPC_CALL);
170 call->rp_rpcvers = htonl(RPC_VER2);
171 call->rp_prog = htonl(prog);
172 call->rp_vers = htonl(vers);
173 call->rp_proc = htonl(proc);
175 /* Make room for the rpc_reply header. */
177 recv_tail = (char *)rdata + rlen;
178 recv_head -= sizeof(*reply);
181 sendudp, send_head, send_tail - send_head,
182 recvrpc, recv_head, recv_tail - recv_head);
186 printf("callrpc: cc=%ld rlen=%lu\n", (long)cc, (u_long)rlen);
191 if (cc <= sizeof(*reply)) {
196 recv_tail = recv_head + cc;
199 * Check the RPC reply status.
200 * The xid, dir, astatus were already checked.
202 reply = (struct rpc_reply *)recv_head;
203 auth = &reply->rp_u.rpu_rok.rok_auth;
204 x = ntohl(auth->authlen);
208 printf("callrpc: reply auth != NULL\n");
213 x = ntohl(reply->rp_u.rpu_rok.rok_status);
215 printf("callrpc: error = %ld\n", (long)x);
219 recv_head += sizeof(*reply);
221 return (ssize_t)(recv_tail - recv_head);
225 * Returns true if packet is the one we're waiting for.
226 * This just checks the XID, direction, acceptance.
227 * Remaining checks are done by callrpc
230 recvrpc(struct iodesc *d, void *pkt, size_t len, time_t tleft)
232 struct rpc_reply *reply;
239 printf("recvrpc: called len=%lu\n", (u_long)len);
242 n = readudp(d, pkt, len, tleft);
246 reply = (struct rpc_reply *)pkt;
248 x = ntohl(reply->rp_xid);
252 printf("recvrpc: rp_xid %d != xid %d\n", x, rpc_xid);
257 x = ntohl(reply->rp_direction);
258 if (x != RPC_REPLY) {
261 printf("recvrpc: rp_direction %d != REPLY\n", x);
266 x = ntohl(reply->rp_astatus);
267 if (x != RPC_MSGACCEPTED) {
268 errno = ntohl(reply->rp_u.rpu_errno);
269 printf("recvrpc: reject, astat=%d, errno=%d\n", x, errno);
273 /* Return data count (thus indicating success) */
278 * Given a pointer to a reply just received,
279 * dig out the IP address/port from the headers.
282 rpc_fromaddr(void *pkt, struct in_addr *addr, u_short *port)
285 /* Tail of IP header: just IP addresses */
289 u_int16_t uh_sport; /* source port */
290 u_int16_t uh_dport; /* destination port */
291 int16_t uh_ulen; /* udp length */
292 u_int16_t uh_sum; /* udp checksum */
293 /* RPC reply header: */
294 struct rpc_reply rpc;
297 hhdr = ((struct hackhdr *)pkt) - 1;
298 addr->s_addr = hhdr->ip_src;
299 *port = hhdr->uh_sport;
303 * RPC Portmapper cache
305 #define PMAP_NUM 8 /* need at most 5 pmap entries */
309 struct in_addr addr; /* server, net order */
310 u_int prog; /* host order */
311 u_int vers; /* host order */
312 int port; /* host order */
313 } rpc_pmap_list[PMAP_NUM];
316 * return port number in host order, or -1.
318 * addr .. server, net order.
319 * prog .. host order.
320 * vers .. host order.
323 rpc_pmap_getcache(struct in_addr addr, u_int prog, u_int vers)
325 struct pmap_list *pl;
327 for (pl = rpc_pmap_list; pl < &rpc_pmap_list[rpc_pmap_num]; pl++) {
328 if (pl->addr.s_addr == addr.s_addr &&
329 pl->prog == prog && pl->vers == vers )
339 * addr .. server, net order.
340 * prog .. host order.
341 * vers .. host order.
342 * port .. host order.
345 rpc_pmap_putcache(struct in_addr addr, u_int prog, u_int vers, int port)
347 struct pmap_list *pl;
349 /* Don't overflow cache... */
350 if (rpc_pmap_num >= PMAP_NUM) {
351 /* ... just re-use the last entry. */
352 rpc_pmap_num = PMAP_NUM - 1;
354 printf("rpc_pmap_putcache: cache overflow\n");
358 pl = &rpc_pmap_list[rpc_pmap_num];
370 * Request a port number from the port mapper.
371 * Returns the port in host order.
372 * prog and vers are host order.
375 rpc_getport(struct iodesc *d, n_long prog, n_long vers)
378 n_long prog; /* call program */
379 n_long vers; /* call version */
380 n_long proto; /* call protocol */
381 n_long port; /* call port (unused) */
387 n_long h[RPC_HEADER_WORDS];
391 n_long h[RPC_HEADER_WORDS];
400 printf("%s: prog=0x%x vers=%d\n", __func__, prog, vers);
403 /* This one is fixed forever. */
404 if (prog == PMAPPROG) {
409 /* Try for cached answer first */
410 port = rpc_pmap_getcache(d->destip, prog, vers);
415 args->prog = htonl(prog);
416 args->vers = htonl(vers);
417 args->proto = htonl(IPPROTO_UDP);
421 cc = rpc_call(d, PMAPPROG, PMAPVERS, PMAPPROC_GETPORT,
422 args, sizeof(*args), res, sizeof(*res));
423 if (cc < sizeof(*res)) {
424 printf("getport: %s", strerror(errno));
428 port = (int)ntohl(res->port);
430 rpc_pmap_putcache(d->destip, prog, vers, port);
435 printf("%s: port=%u\n", __func__, port);