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 * 3. 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
37 * RPC functions used by NFS and bootparams.
38 * Note that bootparams requires the ability to find out the
39 * address of the server from which its response has come.
40 * This is supported by keeping the IP/UDP headers in the
41 * buffer space provided by the caller. (See rpc_fromaddr)
44 #include <sys/param.h>
45 #include <sys/socket.h>
47 #include <netinet/in.h>
48 #include <netinet/in_systm.h>
60 int32_t authtype; /* auth type */
61 uint32_t authlen; /* auth length */
66 int32_t ua_hostname; /* null */
69 int32_t ua_gidlist; /* null */
73 uint32_t rp_xid; /* request transaction id */
74 int32_t rp_direction; /* call direction (0) */
75 uint32_t rp_rpcvers; /* rpc version (2) */
76 uint32_t rp_prog; /* program */
77 uint32_t rp_vers; /* version */
78 uint32_t rp_proc; /* procedure */
82 uint32_t rp_xid; /* request transaction id */
83 int32_t rp_direction; /* call direction (1) */
84 int32_t rp_astatus; /* accept status (0: accepted) */
88 struct auth_info rok_auth;
95 static ssize_t recvrpc(struct iodesc *, void **, void **, time_t, void *);
96 static int rpc_getport(struct iodesc *, n_long, n_long);
99 int rpc_port = 0x400; /* predecrement */
102 * Make a rpc call; return length of answer
103 * Note: Caller must leave room for headers.
106 rpc_call(struct iodesc *d, n_long prog, n_long vers, n_long proc,
107 void *sdata, size_t slen, void **rdata, void **pkt)
110 struct auth_info *auth;
111 struct rpc_call *call;
112 struct rpc_reply *reply;
113 char *send_head, *send_tail;
116 int port; /* host order */
120 printf("rpc_call: prog=0x%x vers=%d proc=%d\n",
124 port = rpc_getport(d, prog, vers);
128 d->destport = htons(port);
131 * Prepend authorization stuff and headers.
132 * Note, must prepend things in reverse order.
135 send_tail = (char *)sdata + slen;
137 /* Auth verifier is always auth_null */
138 send_head -= sizeof(*auth);
139 auth = (struct auth_info *)send_head;
140 auth->authtype = htonl(RPCAUTH_NULL);
143 /* Auth credentials: always auth unix (as root) */
144 send_head -= sizeof(struct auth_unix);
145 bzero(send_head, sizeof(struct auth_unix));
146 send_head -= sizeof(*auth);
147 auth = (struct auth_info *)send_head;
148 auth->authtype = htonl(RPCAUTH_UNIX);
149 auth->authlen = htonl(sizeof(struct auth_unix));
151 /* RPC call structure. */
152 send_head -= sizeof(*call);
153 call = (struct rpc_call *)send_head;
155 call->rp_xid = htonl(rpc_xid);
156 call->rp_direction = htonl(RPC_CALL);
157 call->rp_rpcvers = htonl(RPC_VER2);
158 call->rp_prog = htonl(prog);
159 call->rp_vers = htonl(vers);
160 call->rp_proc = htonl(proc);
164 sendudp, send_head, send_tail - send_head,
165 recvrpc, &ptr, (void **)&reply, NULL);
169 printf("callrpc: cc=%zd\n", cc);
174 if (cc <= sizeof(*reply)) {
181 * Check the RPC reply status.
182 * The xid, dir, astatus were already checked.
184 auth = &reply->rp_u.rpu_rok.rok_auth;
185 x = ntohl(auth->authlen);
189 printf("callrpc: reply auth != NULL\n");
195 x = ntohl(reply->rp_u.rpu_rok.rok_status);
197 printf("callrpc: error = %ld\n", (long)x);
203 rsize = cc - sizeof(*reply);
204 *rdata = (void *)((uintptr_t)reply + sizeof(*reply));
210 * Returns true if packet is the one we're waiting for.
211 * This just checks the XID, direction, acceptance.
212 * Remaining checks are done by callrpc
215 recvrpc(struct iodesc *d, void **pkt, void **payload, time_t tleft, void *extra)
218 struct rpc_reply *reply;
225 printf("recvrpc: called\n");
229 n = readudp(d, &ptr, (void **)&reply, tleft);
235 x = ntohl(reply->rp_xid);
239 printf("recvrpc: rp_xid %d != xid %d\n", x, rpc_xid);
245 x = ntohl(reply->rp_direction);
246 if (x != RPC_REPLY) {
249 printf("recvrpc: rp_direction %d != REPLY\n", x);
255 x = ntohl(reply->rp_astatus);
256 if (x != RPC_MSGACCEPTED) {
257 errno = ntohl(reply->rp_u.rpu_errno);
258 printf("recvrpc: reject, astat=%d, errno=%d\n", x, errno);
265 /* Return data count (thus indicating success) */
270 * Given a pointer to a reply just received,
271 * dig out the IP address/port from the headers.
274 rpc_fromaddr(void *pkt, struct in_addr *addr, u_short *port)
277 /* Tail of IP header: just IP addresses */
281 uint16_t uh_sport; /* source port */
282 uint16_t uh_dport; /* destination port */
283 int16_t uh_ulen; /* udp length */
284 uint16_t uh_sum; /* udp checksum */
285 /* RPC reply header: */
286 struct rpc_reply rpc;
289 hhdr = ((struct hackhdr *)pkt) - 1;
290 addr->s_addr = hhdr->ip_src;
291 *port = hhdr->uh_sport;
295 * RPC Portmapper cache
297 #define PMAP_NUM 8 /* need at most 5 pmap entries */
301 struct in_addr addr; /* server, net order */
302 u_int prog; /* host order */
303 u_int vers; /* host order */
304 int port; /* host order */
305 } rpc_pmap_list[PMAP_NUM];
308 * return port number in host order, or -1.
310 * addr .. server, net order.
311 * prog .. host order.
312 * vers .. host order.
315 rpc_pmap_getcache(struct in_addr addr, u_int prog, u_int vers)
317 struct pmap_list *pl;
319 for (pl = rpc_pmap_list; pl < &rpc_pmap_list[rpc_pmap_num]; pl++) {
320 if (pl->addr.s_addr == addr.s_addr &&
321 pl->prog == prog && pl->vers == vers )
331 * addr .. server, net order.
332 * prog .. host order.
333 * vers .. host order.
334 * port .. host order.
337 rpc_pmap_putcache(struct in_addr addr, u_int prog, u_int vers, int port)
339 struct pmap_list *pl;
341 /* Don't overflow cache... */
342 if (rpc_pmap_num >= PMAP_NUM) {
343 /* ... just re-use the last entry. */
344 rpc_pmap_num = PMAP_NUM - 1;
346 printf("rpc_pmap_putcache: cache overflow\n");
350 pl = &rpc_pmap_list[rpc_pmap_num];
362 * Request a port number from the port mapper.
363 * Returns the port in host order.
364 * prog and vers are host order.
367 rpc_getport(struct iodesc *d, n_long prog, n_long vers)
370 n_long prog; /* call program */
371 n_long vers; /* call version */
372 n_long proto; /* call protocol */
373 n_long port; /* call port (unused) */
379 n_long h[RPC_HEADER_WORDS];
388 printf("%s: prog=0x%x vers=%d\n", __func__, prog, vers);
391 /* This one is fixed forever. */
392 if (prog == PMAPPROG) {
397 /* Try for cached answer first */
398 port = rpc_pmap_getcache(d->destip, prog, vers);
403 args->prog = htonl(prog);
404 args->vers = htonl(vers);
405 args->proto = htonl(IPPROTO_UDP);
409 cc = rpc_call(d, PMAPPROG, PMAPVERS, PMAPPROC_GETPORT,
410 args, sizeof(*args), (void **)&res, &pkt);
411 if (cc < sizeof(*res)) {
412 printf("getport: %s", strerror(errno));
417 port = (int)ntohl(res->port);
420 rpc_pmap_putcache(d->destip, prog, vers, port);
425 printf("%s: port=%u\n", __func__, port);