Annotation of sys/lib/libsa/rpc.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: rpc.c,v 1.13 2003/08/11 06:23:09 deraadt Exp $ */
! 2: /* $NetBSD: rpc.c,v 1.16 1996/10/13 02:29:06 christos Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1992 Regents of the University of California.
! 6: * All rights reserved.
! 7: *
! 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.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 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. All advertising materials mentioning features or use of this software
! 21: * must display the following acknowledgement:
! 22: * This product includes software developed by the University of
! 23: * California, Lawrence Berkeley Laboratory and its contributors.
! 24: * 4. Neither the name of the University nor the names of its contributors
! 25: * may be used to endorse or promote products derived from this software
! 26: * without specific prior written permission.
! 27: *
! 28: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 29: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 30: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 31: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 32: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 33: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 34: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 35: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 36: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 37: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 38: * SUCH DAMAGE.
! 39: *
! 40: * @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp (LBL)
! 41: */
! 42:
! 43: /*
! 44: * RPC functions used by NFS and bootparams.
! 45: * Note that bootparams requires the ability to find out the
! 46: * address of the server from which its response has come.
! 47: * This is supported by keeping the IP/UDP headers in the
! 48: * buffer space provided by the caller. (See rpc_fromaddr)
! 49: */
! 50:
! 51: #include <sys/param.h>
! 52: #include <sys/socket.h>
! 53:
! 54: #include <netinet/in.h>
! 55: #include <netinet/in_systm.h>
! 56:
! 57: #include <nfs/rpcv2.h>
! 58:
! 59: #include "stand.h"
! 60: #include "net.h"
! 61: #include "netif.h"
! 62: #include "rpc.h"
! 63:
! 64: struct auth_info {
! 65: int32_t authtype; /* auth type */
! 66: u_int32_t authlen; /* auth length */
! 67: };
! 68:
! 69: struct auth_unix {
! 70: int32_t ua_time;
! 71: int32_t ua_hostname; /* null */
! 72: int32_t ua_uid;
! 73: int32_t ua_gid;
! 74: int32_t ua_gidlist; /* null */
! 75: };
! 76:
! 77: struct rpc_call {
! 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 */
! 84: };
! 85:
! 86: struct rpc_reply {
! 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) */
! 90: union {
! 91: u_int32_t rpu_errno;
! 92: struct {
! 93: struct auth_info rok_auth;
! 94: u_int32_t rok_status;
! 95: } rpu_rok;
! 96: } rp_u;
! 97: };
! 98:
! 99: /* Local forwards */
! 100: static ssize_t recvrpc(struct iodesc *, void *, size_t, time_t);
! 101: static int rpc_getport(struct iodesc *, n_long, n_long);
! 102:
! 103: int rpc_xid;
! 104: int rpc_port = 0x400; /* predecrement */
! 105:
! 106: /*
! 107: * Make a rpc call; return length of answer
! 108: * Note: Caller must leave room for headers.
! 109: */
! 110: ssize_t
! 111: rpc_call(struct iodesc *d, n_long prog, n_long vers, n_long proc, void *sdata,
! 112: size_t slen, void *rdata, size_t rlen)
! 113: {
! 114: ssize_t cc;
! 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;
! 120: n_long x;
! 121: int port; /* host order */
! 122:
! 123: #ifdef RPC_DEBUG
! 124: if (debug)
! 125: printf("rpc_call: prog=0x%x vers=%d proc=%d\n",
! 126: prog, vers, proc);
! 127: #endif
! 128:
! 129: port = rpc_getport(d, prog, vers);
! 130: if (port == -1)
! 131: return (-1);
! 132:
! 133: d->destport = htons(port);
! 134:
! 135: /*
! 136: * Prepend authorization stuff and headers.
! 137: * Note, must prepend things in reverse order.
! 138: */
! 139: send_head = sdata;
! 140: send_tail = (char *)sdata + slen;
! 141:
! 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);
! 146: auth->authlen = 0;
! 147:
! 148: #if 1
! 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));
! 156: #else
! 157: /* Auth credentials: always auth_null (XXX OK?) */
! 158: send_head -= sizeof(*auth);
! 159: auth = send_head;
! 160: auth->authtype = htonl(RPCAUTH_NULL);
! 161: auth->authlen = 0;
! 162: #endif
! 163:
! 164: /* RPC call structure. */
! 165: send_head -= sizeof(*call);
! 166: call = (struct rpc_call *)send_head;
! 167: rpc_xid++;
! 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);
! 174:
! 175: /* Make room for the rpc_reply header. */
! 176: recv_head = rdata;
! 177: recv_tail = (char *)rdata + rlen;
! 178: recv_head -= sizeof(*reply);
! 179:
! 180: cc = sendrecv(d,
! 181: sendudp, send_head, send_tail - send_head,
! 182: recvrpc, recv_head, recv_tail - recv_head);
! 183:
! 184: #ifdef RPC_DEBUG
! 185: if (debug)
! 186: printf("callrpc: cc=%d rlen=%d\n", cc, rlen);
! 187: #endif
! 188: if (cc < -1)
! 189: return (-1);
! 190:
! 191: if ((size_t)cc <= sizeof(*reply)) {
! 192: errno = EBADRPC;
! 193: return (-1);
! 194: }
! 195:
! 196: recv_tail = recv_head + cc;
! 197:
! 198: /*
! 199: * Check the RPC reply status.
! 200: * The xid, dir, astatus were already checked.
! 201: */
! 202: reply = (struct rpc_reply *)recv_head;
! 203: auth = &reply->rp_u.rpu_rok.rok_auth;
! 204: x = ntohl(auth->authlen);
! 205: if (x != 0) {
! 206: #ifdef RPC_DEBUG
! 207: if (debug)
! 208: printf("callrpc: reply auth != NULL\n");
! 209: #endif
! 210: errno = EBADRPC;
! 211: return(-1);
! 212: }
! 213: x = ntohl(reply->rp_u.rpu_rok.rok_status);
! 214: if (x != 0) {
! 215: printf("callrpc: error = %d\n", x);
! 216: errno = EBADRPC;
! 217: return(-1);
! 218: }
! 219: recv_head += sizeof(*reply);
! 220:
! 221: return (ssize_t)(recv_tail - recv_head);
! 222: }
! 223:
! 224: /*
! 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
! 228: */
! 229: static ssize_t
! 230: recvrpc(struct iodesc *d, void *pkt, size_t len, time_t tleft)
! 231: {
! 232: struct rpc_reply *reply;
! 233: ssize_t n;
! 234: int x;
! 235:
! 236: errno = 0;
! 237: #ifdef RPC_DEBUG
! 238: if (debug)
! 239: printf("recvrpc: called len=%d\n", len);
! 240: #endif
! 241:
! 242: n = readudp(d, pkt, len, tleft);
! 243: if (n <= (4 * 4))
! 244: return -1;
! 245:
! 246: reply = (struct rpc_reply *)pkt;
! 247:
! 248: x = ntohl(reply->rp_xid);
! 249: if (x != rpc_xid) {
! 250: #ifdef RPC_DEBUG
! 251: if (debug)
! 252: printf("recvrpc: rp_xid %d != xid %d\n", x, rpc_xid);
! 253: #endif
! 254: return -1;
! 255: }
! 256:
! 257: x = ntohl(reply->rp_direction);
! 258: if (x != RPC_REPLY) {
! 259: #ifdef RPC_DEBUG
! 260: if (debug)
! 261: printf("recvrpc: rp_direction %d != REPLY\n", x);
! 262: #endif
! 263: return -1;
! 264: }
! 265:
! 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);
! 270: return -1;
! 271: }
! 272:
! 273: /* Return data count (thus indicating success) */
! 274: return (n);
! 275: }
! 276:
! 277: /*
! 278: * Given a pointer to a reply just received,
! 279: * dig out the IP address/port from the headers.
! 280: */
! 281: void
! 282: rpc_fromaddr(void *pkt, struct in_addr *addr, u_short *port)
! 283: {
! 284: struct hackhdr {
! 285: /* Tail of IP header: just IP addresses */
! 286: n_long ip_src;
! 287: n_long ip_dst;
! 288: /* UDP header: */
! 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;
! 295: } *hhdr;
! 296:
! 297: hhdr = ((struct hackhdr *)pkt) - 1;
! 298: addr->s_addr = hhdr->ip_src;
! 299: *port = hhdr->uh_sport;
! 300: }
! 301:
! 302: /*
! 303: * RPC Portmapper cache
! 304: */
! 305: #define PMAP_NUM 8 /* need at most 5 pmap entries */
! 306:
! 307: int rpc_pmap_num;
! 308: struct pmap_list {
! 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];
! 314:
! 315: /* return port number in host order, or -1 */
! 316: int
! 317: rpc_pmap_getcache(struct in_addr addr, u_int prog, u_int vers)
! 318: {
! 319: struct pmap_list *pl;
! 320:
! 321: for (pl = rpc_pmap_list; pl < &rpc_pmap_list[rpc_pmap_num]; pl++) {
! 322: if (pl->addr.s_addr == addr.s_addr &&
! 323: pl->prog == prog && pl->vers == vers)
! 324: return (pl->port);
! 325: }
! 326: return (-1);
! 327: }
! 328:
! 329: void
! 330: rpc_pmap_putcache(struct in_addr addr, u_int prog, u_int vers, int port)
! 331: {
! 332: struct pmap_list *pl;
! 333:
! 334: /* Don't overflow cache... */
! 335: if (rpc_pmap_num >= PMAP_NUM) {
! 336: /* ... just re-use the last entry. */
! 337: rpc_pmap_num = PMAP_NUM - 1;
! 338: #ifdef RPC_DEBUG
! 339: printf("rpc_pmap_putcache: cache overflow\n");
! 340: #endif
! 341: }
! 342:
! 343: pl = &rpc_pmap_list[rpc_pmap_num];
! 344: rpc_pmap_num++;
! 345:
! 346: /* Cache answer */
! 347: pl->addr = addr;
! 348: pl->prog = prog;
! 349: pl->vers = vers;
! 350: pl->port = port;
! 351: }
! 352:
! 353:
! 354: /*
! 355: * Request a port number from the port mapper.
! 356: * Returns the port in host order.
! 357: */
! 358: int
! 359: rpc_getport(struct iodesc *d, n_long prog, n_long vers)
! 360: {
! 361: struct args {
! 362: n_long prog; /* call program */
! 363: n_long vers; /* call version */
! 364: n_long proto; /* call protocol */
! 365: n_long port; /* call port (unused) */
! 366: } *args;
! 367: struct res {
! 368: n_long port;
! 369: } *res;
! 370: struct {
! 371: n_long h[RPC_HEADER_WORDS];
! 372: struct args d;
! 373: } sdata;
! 374: struct {
! 375: n_long h[RPC_HEADER_WORDS];
! 376: struct res d;
! 377: n_long pad;
! 378: } rdata;
! 379: ssize_t cc;
! 380: int port;
! 381:
! 382: #ifdef RPC_DEBUG
! 383: if (debug)
! 384: printf("getport: prog=0x%x vers=%d\n", prog, vers);
! 385: #endif
! 386:
! 387: /* This one is fixed forever. */
! 388: if (prog == PMAPPROG)
! 389: return (PMAPPORT);
! 390:
! 391: /* Try for cached answer first */
! 392: port = rpc_pmap_getcache(d->destip, prog, vers);
! 393: if (port != -1)
! 394: return (port);
! 395:
! 396: args = &sdata.d;
! 397: args->prog = htonl(prog);
! 398: args->vers = htonl(vers);
! 399: args->proto = htonl(IPPROTO_UDP);
! 400: args->port = 0;
! 401: res = &rdata.d;
! 402:
! 403: cc = rpc_call(d, PMAPPROG, PMAPVERS, PMAPPROC_GETPORT,
! 404: args, sizeof(*args), res, sizeof(*res));
! 405: if (cc < 0 || (size_t)cc < sizeof(*res)) {
! 406: printf("getport: %s", strerror(errno));
! 407: errno = EBADRPC;
! 408: return (-1);
! 409: }
! 410: port = (int)ntohl(res->port);
! 411:
! 412: rpc_pmap_putcache(d->destip, prog, vers, port);
! 413:
! 414: return (port);
! 415: }
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