1 /* @(#)pmap_rmt.c 2.2 88/08/01 4.0 RPCSRC */ 2 /* 3 * Copyright (c) 2010, Oracle America, Inc. 4 * 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * 10 * * Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 18 * * Neither the name of the "Oracle America, Inc." nor the names of 19 * its contributors may be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 23 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 25 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 26 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 28 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 29 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 #if !defined(lint) && defined(SCCSIDS) 35 static char sccsid[] = "@(#)pmap_rmt.c 1.21 87/08/27 Copyr 1984 Sun Micro"; 36 #endif 37 38 /* 39 * pmap_rmt.c 40 * Client interface to pmap rpc service. 41 * remote call and broadcast service 42 */ 43 44 #include "k5-platform.h" 45 #include <unistd.h> 46 #include <gssrpc/rpc.h> 47 #include <gssrpc/pmap_prot.h> 48 #include <gssrpc/pmap_clnt.h> 49 #include <gssrpc/pmap_rmt.h> 50 #include <sys/socket.h> 51 #ifdef sun 52 #include <sys/sockio.h> 53 #endif 54 #ifdef OSF1 55 #include <net/route.h> 56 #include <sys/mbuf.h> 57 #endif 58 #include <net/if.h> 59 #include <sys/ioctl.h> 60 #include <arpa/inet.h> 61 #define MAX_BROADCAST_SIZE 1400 62 #include <port-sockets.h> 63 #include "socket-utils.h" 64 65 static struct timeval timeout = { 3, 0 }; 66 67 #ifndef GETSOCKNAME_ARG3_TYPE 68 #define GETSOCKNAME_ARG3_TYPE int 69 #endif 70 71 /* 72 * pmapper remote-call-service interface. 73 * This routine is used to call the pmapper remote call service 74 * which will look up a service program in the port maps, and then 75 * remotely call that routine with the given parameters. This allows 76 * programs to do a lookup and call in one step. 77 */ 78 enum clnt_stat 79 pmap_rmtcall( 80 struct sockaddr_in *addr, 81 rpcprog_t prog, 82 rpcvers_t vers, 83 rpcproc_t proc, 84 xdrproc_t xdrargs, 85 caddr_t argsp, 86 xdrproc_t xdrres, 87 caddr_t resp, 88 struct timeval tout, 89 rpcport_t *port_ptr) 90 { 91 SOCKET sock = INVALID_SOCKET; 92 CLIENT *client; 93 struct rmtcallargs a; 94 struct rmtcallres r; 95 enum clnt_stat stat; 96 97 addr->sin_port = htons(PMAPPORT); 98 client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &sock); 99 if (client != (CLIENT *)NULL) { 100 a.prog = prog; 101 a.vers = vers; 102 a.proc = proc; 103 a.args_ptr = argsp; 104 a.xdr_args = xdrargs; 105 r.port_ptr = port_ptr; 106 r.results_ptr = resp; 107 r.xdr_results = xdrres; 108 stat = CLNT_CALL(client, PMAPPROC_CALLIT, 109 (xdrproc_t)xdr_rmtcall_args, &a, 110 (xdrproc_t)xdr_rmtcallres, &r, tout); 111 CLNT_DESTROY(client); 112 } else { 113 stat = RPC_FAILED; 114 } 115 (void)closesocket(sock); 116 addr->sin_port = 0; 117 return (stat); 118 } 119 120 121 /* 122 * XDR remote call arguments 123 * written for XDR_ENCODE direction only 124 */ 125 bool_t 126 xdr_rmtcall_args( 127 XDR *xdrs, 128 struct rmtcallargs *cap) 129 { 130 u_int lenposition, argposition, position; 131 132 if (xdr_u_int32(xdrs, &(cap->prog)) && 133 xdr_u_int32(xdrs, &(cap->vers)) && 134 xdr_u_int32(xdrs, &(cap->proc))) { 135 lenposition = XDR_GETPOS(xdrs); 136 if (! xdr_u_int32(xdrs, &(cap->arglen))) 137 return (FALSE); 138 argposition = XDR_GETPOS(xdrs); 139 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr)) 140 return (FALSE); 141 position = XDR_GETPOS(xdrs); 142 cap->arglen = (uint32_t)position - (uint32_t)argposition; 143 XDR_SETPOS(xdrs, lenposition); 144 if (! xdr_u_int32(xdrs, &(cap->arglen))) 145 return (FALSE); 146 XDR_SETPOS(xdrs, position); 147 return (TRUE); 148 } 149 return (FALSE); 150 } 151 152 /* 153 * XDR remote call results 154 * written for XDR_DECODE direction only 155 */ 156 bool_t 157 xdr_rmtcallres( 158 XDR *xdrs, 159 struct rmtcallres *crp) 160 { 161 caddr_t port_ptr; 162 163 port_ptr = (caddr_t)(void *)crp->port_ptr; 164 if (!xdr_reference(xdrs, &port_ptr, sizeof (uint32_t), 165 (xdrproc_t)xdr_u_int32)) 166 return (FALSE); 167 crp->port_ptr = (uint32_t *)(void *)port_ptr; 168 if (xdr_u_int32(xdrs, &crp->resultslen)) 169 return ((*(crp->xdr_results))(xdrs, crp->results_ptr)); 170 return (FALSE); 171 } 172 173 174 /* 175 * The following is kludged-up support for simple rpc broadcasts. 176 * Someday a large, complicated system will replace these trivial 177 * routines which only support udp/ip . 178 */ 179 180 #define GIFCONF_BUFSIZE (256 * sizeof (struct ifconf)) 181 182 static int 183 getbroadcastnets( 184 struct in_addr *addrs, 185 int sock, /* any valid socket will do */ 186 char *buf /* why allocxate more when we can use existing... */ 187 ) 188 { 189 struct ifconf ifc; 190 struct ifreq ifreq, *ifr; 191 int n, i; 192 193 ifc.ifc_len = GIFCONF_BUFSIZE; 194 ifc.ifc_buf = buf; 195 memset (buf, 0, GIFCONF_BUFSIZE); 196 if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) { 197 perror("broadcast: ioctl (get interface configuration)"); 198 return (0); 199 } 200 ifr = ifc.ifc_req; 201 for (i = 0, n = ifc.ifc_len/sizeof (struct ifreq); n > 0; n--, ifr++) { 202 ifreq = *ifr; 203 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) { 204 perror("broadcast: ioctl (get interface flags)"); 205 continue; 206 } 207 if ((ifreq.ifr_flags & IFF_BROADCAST) && 208 (ifreq.ifr_flags & IFF_UP) && 209 ifr->ifr_addr.sa_family == AF_INET) { 210 #ifdef SIOCGIFBRDADDR /* 4.3BSD */ 211 if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { 212 addrs[i++].s_addr = INADDR_ANY; 213 } else { 214 addrs[i++] = sa2sin(&ifreq.ifr_addr)->sin_addr; 215 } 216 #else /* 4.2 BSD */ 217 struct sockaddr_in *sockin; 218 sockin = sa2sin(&ifr->ifr_addr); 219 addrs[i++] = inet_makeaddr(inet_netof 220 (sockin->sin_addr.s_addr), INADDR_ANY); 221 #endif 222 } 223 } 224 return (i); 225 } 226 227 enum clnt_stat 228 clnt_broadcast( 229 rpcprog_t prog, /* program number */ 230 rpcvers_t vers, /* version number */ 231 rpcproc_t proc, /* procedure number */ 232 xdrproc_t xargs, /* xdr routine for args */ 233 caddr_t argsp, /* pointer to args */ 234 xdrproc_t xresults, /* xdr routine for results */ 235 caddr_t resultsp, /* pointer to results */ 236 resultproc_t eachresult /* call with each result obtained */ 237 ) 238 { 239 enum clnt_stat stat; 240 AUTH *unix_auth = authunix_create_default(); 241 XDR xdr_stream; 242 XDR *xdrs = &xdr_stream; 243 int outlen, nets; 244 ssize_t inlen; 245 GETSOCKNAME_ARG3_TYPE fromlen; 246 SOCKET sock; 247 int on = 1; 248 #ifdef FD_SETSIZE 249 fd_set mask; 250 fd_set readfds; 251 #else 252 int readfds; 253 int mask; 254 #endif /* def FD_SETSIZE */ 255 int i; 256 bool_t done = FALSE; 257 uint32_t xid; 258 rpcport_t port; 259 struct in_addr addrs[20]; 260 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ 261 struct rmtcallargs a; 262 struct rmtcallres r; 263 struct rpc_msg msg; 264 struct timeval t, t2; 265 char outbuf[MAX_BROADCAST_SIZE]; 266 #ifndef MAX 267 #define MAX(A,B) ((A)<(B)?(B):(A)) 268 #endif 269 char inbuf[MAX (UDPMSGSIZE, GIFCONF_BUFSIZE)]; 270 271 /* 272 * initialization: create a socket, a broadcast address, and 273 * preserialize the arguments into a send buffer. 274 */ 275 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 276 perror("Cannot create socket for broadcast rpc"); 277 stat = RPC_CANTSEND; 278 goto done_broad; 279 } 280 set_cloexec_fd(sock); 281 #ifdef SO_BROADCAST 282 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *) &on, 283 sizeof (on)) < 0) { 284 perror("Cannot set socket option SO_BROADCAST"); 285 stat = RPC_CANTSEND; 286 goto done_broad; 287 } 288 #endif /* def SO_BROADCAST */ 289 #ifdef FD_SETSIZE 290 FD_ZERO(&mask); 291 FD_SET(sock, &mask); 292 #else 293 mask = (1 << sock); 294 #endif /* def FD_SETSIZE */ 295 nets = getbroadcastnets(addrs, sock, inbuf); 296 memset(&baddr, 0, sizeof (baddr)); 297 baddr.sin_family = AF_INET; 298 baddr.sin_port = htons(PMAPPORT); 299 baddr.sin_addr.s_addr = htonl(INADDR_ANY); 300 /* baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */ 301 (void)gettimeofday(&t, (struct timezone *)0); 302 msg.rm_xid = xid = getpid() ^ t.tv_sec ^ t.tv_usec; 303 t.tv_usec = 0; 304 msg.rm_direction = CALL; 305 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 306 msg.rm_call.cb_prog = PMAPPROG; 307 msg.rm_call.cb_vers = PMAPVERS; 308 msg.rm_call.cb_proc = PMAPPROC_CALLIT; 309 msg.rm_call.cb_cred = unix_auth->ah_cred; 310 msg.rm_call.cb_verf = unix_auth->ah_verf; 311 a.prog = prog; 312 a.vers = vers; 313 a.proc = proc; 314 a.xdr_args = xargs; 315 a.args_ptr = argsp; 316 r.port_ptr = &port; 317 r.xdr_results = xresults; 318 r.results_ptr = resultsp; 319 xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE); 320 if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) { 321 stat = RPC_CANTENCODEARGS; 322 goto done_broad; 323 } 324 outlen = (int)xdr_getpos(xdrs); 325 xdr_destroy(xdrs); 326 /* 327 * Basic loop: broadcast a packet and wait a while for response(s). 328 * The response timeout grows larger per iteration. 329 */ 330 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { 331 for (i = 0; i < nets; i++) { 332 baddr.sin_addr = addrs[i]; 333 if (sendto(sock, outbuf, outlen, 0, 334 (struct sockaddr *)&baddr, 335 sizeof (struct sockaddr)) != outlen) { 336 perror("Cannot send broadcast packet"); 337 stat = RPC_CANTSEND; 338 goto done_broad; 339 } 340 } 341 if (eachresult == NULL) { 342 stat = RPC_SUCCESS; 343 goto done_broad; 344 } 345 recv_again: 346 msg.acpted_rply.ar_verf = gssrpc__null_auth; 347 msg.acpted_rply.ar_results.where = (caddr_t)&r; 348 msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_rmtcallres; 349 readfds = mask; 350 t2 = t; 351 switch (select(gssrpc__rpc_dtablesize(), &readfds, (fd_set *)NULL, 352 (fd_set *)NULL, &t2)) { 353 354 case 0: /* timed out */ 355 stat = RPC_TIMEDOUT; 356 continue; 357 358 case -1: /* some kind of error */ 359 if (errno == EINTR) 360 goto recv_again; 361 perror("Broadcast select problem"); 362 stat = RPC_CANTRECV; 363 goto done_broad; 364 365 } /* end of select results switch */ 366 try_again: 367 fromlen = sizeof(struct sockaddr); 368 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, 369 (struct sockaddr *)&raddr, &fromlen); 370 if (inlen < 0) { 371 if (errno == EINTR) 372 goto try_again; 373 perror("Cannot receive reply to broadcast"); 374 stat = RPC_CANTRECV; 375 goto done_broad; 376 } 377 if ((size_t)inlen < sizeof(uint32_t)) 378 goto recv_again; 379 /* 380 * see if reply transaction id matches sent id. 381 * If so, decode the results. 382 */ 383 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE); 384 if (xdr_replymsg(xdrs, &msg)) { 385 if ((msg.rm_xid == xid) && 386 (msg.rm_reply.rp_stat == MSG_ACCEPTED) && 387 (msg.acpted_rply.ar_stat == SUCCESS)) { 388 raddr.sin_port = htons((u_short)port); 389 done = (*eachresult)(resultsp, &raddr); 390 } 391 /* otherwise, we just ignore the errors ... */ 392 } else { 393 #ifdef notdef 394 /* some kind of deserialization problem ... */ 395 if (msg.rm_xid == xid) 396 fprintf(stderr, "Broadcast deserialization problem"); 397 /* otherwise, just random garbage */ 398 #endif 399 } 400 xdrs->x_op = XDR_FREE; 401 msg.acpted_rply.ar_results.proc = xdr_void; 402 (void)xdr_replymsg(xdrs, &msg); 403 (void)(*xresults)(xdrs, resultsp); 404 xdr_destroy(xdrs); 405 if (done) { 406 stat = RPC_SUCCESS; 407 goto done_broad; 408 } else { 409 goto recv_again; 410 } 411 } 412 done_broad: 413 (void)closesocket(sock); 414 AUTH_DESTROY(unix_auth); 415 return (stat); 416 } 417