/* $NetBSD: rpc.c,v 1.18 1998/01/23 19:27:45 thorpej Exp $ */ /* * Copyright (c) 1992 Regents of the University of California. * All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided 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. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. * * @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp (LBL) */ #include __FBSDID("$FreeBSD$"); /* * RPC functions used by NFS and bootparams. * Note that bootparams requires the ability to find out the * address of the server from which its response has come. * This is supported by keeping the IP/UDP headers in the * buffer space provided by the caller. (See rpc_fromaddr) */ #include #include #include #include #include #include "rpcv2.h" #include "stand.h" #include "net.h" #include "netif.h" #include "rpc.h" struct auth_info { int32_t authtype; /* auth type */ u_int32_t authlen; /* auth length */ }; struct auth_unix { int32_t ua_time; int32_t ua_hostname; /* null */ int32_t ua_uid; int32_t ua_gid; int32_t ua_gidlist; /* null */ }; struct rpc_call { u_int32_t rp_xid; /* request transaction id */ int32_t rp_direction; /* call direction (0) */ u_int32_t rp_rpcvers; /* rpc version (2) */ u_int32_t rp_prog; /* program */ u_int32_t rp_vers; /* version */ u_int32_t rp_proc; /* procedure */ }; struct rpc_reply { u_int32_t rp_xid; /* request transaction id */ int32_t rp_direction; /* call direction (1) */ int32_t rp_astatus; /* accept status (0: accepted) */ union { u_int32_t rpu_errno; struct { struct auth_info rok_auth; u_int32_t rok_status; } rpu_rok; } rp_u; }; /* Local forwards */ static ssize_t recvrpc(struct iodesc *, void **, void **, time_t, void *); static int rpc_getport(struct iodesc *, n_long, n_long); int rpc_xid; int rpc_port = 0x400; /* predecrement */ /* * Make a rpc call; return length of answer * Note: Caller must leave room for headers. */ ssize_t rpc_call(struct iodesc *d, n_long prog, n_long vers, n_long proc, void *sdata, size_t slen, void **rdata, void **pkt) { ssize_t cc, rsize; struct auth_info *auth; struct rpc_call *call; struct rpc_reply *reply; char *send_head, *send_tail; void *ptr; n_long x; int port; /* host order */ #ifdef RPC_DEBUG if (debug) printf("rpc_call: prog=0x%x vers=%d proc=%d\n", prog, vers, proc); #endif port = rpc_getport(d, prog, vers); if (port == -1) return (-1); d->destport = htons(port); /* * Prepend authorization stuff and headers. * Note, must prepend things in reverse order. */ send_head = sdata; send_tail = (char *)sdata + slen; /* Auth verifier is always auth_null */ send_head -= sizeof(*auth); auth = (struct auth_info *)send_head; auth->authtype = htonl(RPCAUTH_NULL); auth->authlen = 0; /* Auth credentials: always auth unix (as root) */ send_head -= sizeof(struct auth_unix); bzero(send_head, sizeof(struct auth_unix)); send_head -= sizeof(*auth); auth = (struct auth_info *)send_head; auth->authtype = htonl(RPCAUTH_UNIX); auth->authlen = htonl(sizeof(struct auth_unix)); /* RPC call structure. */ send_head -= sizeof(*call); call = (struct rpc_call *)send_head; rpc_xid++; call->rp_xid = htonl(rpc_xid); call->rp_direction = htonl(RPC_CALL); call->rp_rpcvers = htonl(RPC_VER2); call->rp_prog = htonl(prog); call->rp_vers = htonl(vers); call->rp_proc = htonl(proc); ptr = NULL; cc = sendrecv(d, sendudp, send_head, send_tail - send_head, recvrpc, &ptr, (void **)&reply, NULL); #ifdef RPC_DEBUG if (debug) printf("callrpc: cc=%zd\n", cc); #endif if (cc == -1) return (-1); if (cc <= sizeof(*reply)) { errno = EBADRPC; free(ptr); return (-1); } /* * Check the RPC reply status. * The xid, dir, astatus were already checked. */ auth = &reply->rp_u.rpu_rok.rok_auth; x = ntohl(auth->authlen); if (x != 0) { #ifdef RPC_DEBUG if (debug) printf("callrpc: reply auth != NULL\n"); #endif errno = EBADRPC; free(ptr); return (-1); } x = ntohl(reply->rp_u.rpu_rok.rok_status); if (x != 0) { printf("callrpc: error = %ld\n", (long)x); errno = EBADRPC; free(ptr); return (-1); } rsize = cc - sizeof(*reply); *rdata = (void *)((uintptr_t)reply + sizeof(*reply)); *pkt = ptr; return (rsize); } /* * Returns true if packet is the one we're waiting for. * This just checks the XID, direction, acceptance. * Remaining checks are done by callrpc */ static ssize_t recvrpc(struct iodesc *d, void **pkt, void **payload, time_t tleft, void *extra) { void *ptr; struct rpc_reply *reply; ssize_t n; int x; errno = 0; #ifdef RPC_DEBUG if (debug) printf("recvrpc: called\n"); #endif ptr = NULL; n = readudp(d, &ptr, (void **)&reply, tleft); if (n <= (4 * 4)) { free(ptr); return (-1); } x = ntohl(reply->rp_xid); if (x != rpc_xid) { #ifdef RPC_DEBUG if (debug) printf("recvrpc: rp_xid %d != xid %d\n", x, rpc_xid); #endif free(ptr); return (-1); } x = ntohl(reply->rp_direction); if (x != RPC_REPLY) { #ifdef RPC_DEBUG if (debug) printf("recvrpc: rp_direction %d != REPLY\n", x); #endif free(ptr); return (-1); } x = ntohl(reply->rp_astatus); if (x != RPC_MSGACCEPTED) { errno = ntohl(reply->rp_u.rpu_errno); printf("recvrpc: reject, astat=%d, errno=%d\n", x, errno); free(ptr); return (-1); } *pkt = ptr; *payload = reply; /* Return data count (thus indicating success) */ return (n); } /* * Given a pointer to a reply just received, * dig out the IP address/port from the headers. */ void rpc_fromaddr(void *pkt, struct in_addr *addr, u_short *port) { struct hackhdr { /* Tail of IP header: just IP addresses */ n_long ip_src; n_long ip_dst; /* UDP header: */ u_int16_t uh_sport; /* source port */ u_int16_t uh_dport; /* destination port */ int16_t uh_ulen; /* udp length */ u_int16_t uh_sum; /* udp checksum */ /* RPC reply header: */ struct rpc_reply rpc; } *hhdr; hhdr = ((struct hackhdr *)pkt) - 1; addr->s_addr = hhdr->ip_src; *port = hhdr->uh_sport; } /* * RPC Portmapper cache */ #define PMAP_NUM 8 /* need at most 5 pmap entries */ int rpc_pmap_num; struct pmap_list { struct in_addr addr; /* server, net order */ u_int prog; /* host order */ u_int vers; /* host order */ int port; /* host order */ } rpc_pmap_list[PMAP_NUM]; /* * return port number in host order, or -1. * arguments are: * addr .. server, net order. * prog .. host order. * vers .. host order. */ int rpc_pmap_getcache(struct in_addr addr, u_int prog, u_int vers) { struct pmap_list *pl; for (pl = rpc_pmap_list; pl < &rpc_pmap_list[rpc_pmap_num]; pl++) { if (pl->addr.s_addr == addr.s_addr && pl->prog == prog && pl->vers == vers ) { return (pl->port); } } return (-1); } /* * arguments are: * addr .. server, net order. * prog .. host order. * vers .. host order. * port .. host order. */ void rpc_pmap_putcache(struct in_addr addr, u_int prog, u_int vers, int port) { struct pmap_list *pl; /* Don't overflow cache... */ if (rpc_pmap_num >= PMAP_NUM) { /* ... just re-use the last entry. */ rpc_pmap_num = PMAP_NUM - 1; #ifdef RPC_DEBUG printf("rpc_pmap_putcache: cache overflow\n"); #endif } pl = &rpc_pmap_list[rpc_pmap_num]; rpc_pmap_num++; /* Cache answer */ pl->addr = addr; pl->prog = prog; pl->vers = vers; pl->port = port; } /* * Request a port number from the port mapper. * Returns the port in host order. * prog and vers are host order. */ int rpc_getport(struct iodesc *d, n_long prog, n_long vers) { struct args { n_long prog; /* call program */ n_long vers; /* call version */ n_long proto; /* call protocol */ n_long port; /* call port (unused) */ } *args; struct res { n_long port; } *res; struct { n_long h[RPC_HEADER_WORDS]; struct args d; } sdata; void *pkt; ssize_t cc; int port; #ifdef RPC_DEBUG if (debug) printf("%s: prog=0x%x vers=%d\n", __func__, prog, vers); #endif /* This one is fixed forever. */ if (prog == PMAPPROG) { port = PMAPPORT; goto out; } /* Try for cached answer first */ port = rpc_pmap_getcache(d->destip, prog, vers); if (port != -1) goto out; args = &sdata.d; args->prog = htonl(prog); args->vers = htonl(vers); args->proto = htonl(IPPROTO_UDP); args->port = 0; pkt = NULL; cc = rpc_call(d, PMAPPROG, PMAPVERS, PMAPPROC_GETPORT, args, sizeof(*args), (void **)&res, &pkt); if (cc < sizeof(*res)) { printf("getport: %s", strerror(errno)); errno = EBADRPC; free(pkt); return (-1); } port = (int)ntohl(res->port); free(pkt); rpc_pmap_putcache(d->destip, prog, vers, port); out: #ifdef RPC_DEBUG if (debug) printf("%s: port=%u\n", __func__, port); #endif return (port); }