1 /* $OpenBSD: pmap_rmt.c,v 1.28 2007/09/02 15:19:17 deraadt Exp $ */ 2 /* 3 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 4 * unrestricted use provided that this legend is included on all tape 5 * media and as a part of the software program in whole or part. Users 6 * may copy or modify Sun RPC without charge, but are not authorized 7 * to license or distribute it to anyone else except as part of a product or 8 * program developed by the user. 9 * 10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 13 * 14 * Sun RPC is provided with no support and without any obligation on the 15 * part of Sun Microsystems, Inc. to assist in its use, correction, 16 * modification or enhancement. 17 * 18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 20 * OR ANY PART THEREOF. 21 * 22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 23 * or profits or other special, indirect and consequential damages, even if 24 * Sun has been advised of the possibility of such damages. 25 * 26 * Sun Microsystems, Inc. 27 * 2550 Garcia Avenue 28 * Mountain View, California 94043 29 */ 30 31 /* 32 * pmap_rmt.c 33 * Client interface to pmap rpc service. 34 * remote call and broadcast service 35 * 36 * Copyright (C) 1984, Sun Microsystems, Inc. 37 */ 38 39 #include <rpc/rpc.h> 40 #include <rpc/pmap_prot.h> 41 #include <rpc/pmap_clnt.h> 42 #include <rpc/pmap_rmt.h> 43 #include <sys/socket.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <unistd.h> 47 #include <errno.h> 48 #include <string.h> 49 #include <net/if.h> 50 #include <sys/ioctl.h> 51 #include <arpa/inet.h> 52 #include <ifaddrs.h> 53 #define MAX_BROADCAST_SIZE 1400 54 55 static struct timeval timeout = { 3, 0 }; 56 57 58 /* 59 * pmapper remote-call-service interface. 60 * This routine is used to call the pmapper remote call service 61 * which will look up a service program in the port maps, and then 62 * remotely call that routine with the given parameters. This allows 63 * programs to do a lookup and call in one step. 64 */ 65 enum clnt_stat 66 pmap_rmtcall(struct sockaddr_in *addr, u_long prog, u_long vers, u_long proc, 67 xdrproc_t xdrargs, caddr_t argsp, xdrproc_t xdrres, caddr_t resp, 68 struct timeval tout, u_long *port_ptr) 69 { 70 int sock = -1; 71 CLIENT *client; 72 struct rmtcallargs a; 73 struct rmtcallres r; 74 enum clnt_stat stat; 75 76 addr->sin_port = htons(PMAPPORT); 77 client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &sock); 78 if (client != NULL) { 79 a.prog = prog; 80 a.vers = vers; 81 a.proc = proc; 82 a.args_ptr = argsp; 83 a.xdr_args = xdrargs; 84 r.port_ptr = port_ptr; 85 r.results_ptr = resp; 86 r.xdr_results = xdrres; 87 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a, 88 xdr_rmtcallres, &r, tout); 89 CLNT_DESTROY(client); 90 } else { 91 stat = RPC_FAILED; 92 } 93 if (sock != -1) 94 (void)close(sock); 95 addr->sin_port = 0; 96 return (stat); 97 } 98 99 100 /* 101 * XDR remote call arguments 102 * written for XDR_ENCODE direction only 103 */ 104 bool_t 105 xdr_rmtcall_args(XDR *xdrs, struct rmtcallargs *cap) 106 { 107 u_int lenposition, argposition, position; 108 109 if (xdr_u_long(xdrs, &(cap->prog)) && 110 xdr_u_long(xdrs, &(cap->vers)) && 111 xdr_u_long(xdrs, &(cap->proc))) { 112 lenposition = XDR_GETPOS(xdrs); 113 if (! xdr_u_long(xdrs, &(cap->arglen))) 114 return (FALSE); 115 argposition = XDR_GETPOS(xdrs); 116 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr)) 117 return (FALSE); 118 position = XDR_GETPOS(xdrs); 119 cap->arglen = (u_long)position - (u_long)argposition; 120 XDR_SETPOS(xdrs, lenposition); 121 if (! xdr_u_long(xdrs, &(cap->arglen))) 122 return (FALSE); 123 XDR_SETPOS(xdrs, position); 124 return (TRUE); 125 } 126 return (FALSE); 127 } 128 129 /* 130 * XDR remote call results 131 * written for XDR_DECODE direction only 132 */ 133 bool_t 134 xdr_rmtcallres(XDR *xdrs, struct rmtcallres *crp) 135 { 136 caddr_t port_ptr; 137 138 port_ptr = (caddr_t)crp->port_ptr; 139 if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), 140 xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) { 141 crp->port_ptr = (u_long *)port_ptr; 142 return ((*(crp->xdr_results))(xdrs, crp->results_ptr)); 143 } 144 return (FALSE); 145 } 146 147 148 /* 149 * The following is kludged-up support for simple rpc broadcasts. 150 * Someday a large, complicated system will replace these trivial 151 * routines which only support udp/ip . 152 */ 153 static int 154 newgetbroadcastnets(struct in_addr **addrsp) 155 { 156 struct ifaddrs *ifap, *ifa; 157 struct sockaddr_in *sin; 158 struct in_addr *addrs; 159 int i = 0, n = 0; 160 161 if (getifaddrs(&ifap) != 0) 162 return 0; 163 164 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 165 if (ifa->ifa_addr->sa_family != AF_INET) 166 continue; 167 if ((ifa->ifa_flags & IFF_BROADCAST) && 168 (ifa->ifa_flags & IFF_UP) && 169 ifa->ifa_broadaddr && 170 ifa->ifa_broadaddr->sa_family == AF_INET) { 171 n++; 172 } 173 } 174 175 addrs = (struct in_addr *)calloc(n, sizeof(*addrs)); 176 if (addrs == NULL) { 177 freeifaddrs(ifap); 178 return 0; 179 } 180 181 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 182 if (ifa->ifa_addr->sa_family != AF_INET) 183 continue; 184 if ((ifa->ifa_flags & IFF_BROADCAST) && 185 (ifa->ifa_flags & IFF_UP) && 186 ifa->ifa_broadaddr && 187 ifa->ifa_broadaddr->sa_family == AF_INET) { 188 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 189 addrs[i++] = sin->sin_addr; 190 } 191 } 192 193 freeifaddrs(ifap); 194 *addrsp = addrs; 195 return i; 196 } 197 198 typedef bool_t (*resultproc_t)(); 199 200 enum clnt_stat 201 clnt_broadcast(u_long prog, /* program number */ 202 u_long vers, /* version number */ 203 u_long proc, /* procedure number */ 204 xdrproc_t xargs, /* xdr routine for args */ 205 caddr_t argsp, /* pointer to args */ 206 xdrproc_t xresults, /* xdr routine for results */ 207 caddr_t resultsp, /* pointer to results */ 208 resultproc_t eachresult) /* call with each result obtained */ 209 { 210 enum clnt_stat stat; 211 AUTH *unix_auth; 212 XDR xdr_stream; 213 XDR *xdrs = &xdr_stream; 214 int outlen, inlen, nets; 215 socklen_t fromlen; 216 int sock = -1; 217 int on = 1; 218 struct pollfd pfd[1]; 219 int i; 220 int timo; 221 bool_t done = FALSE; 222 u_long xid; 223 u_long port; 224 struct in_addr *addrs = NULL; 225 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ 226 struct rmtcallargs a; 227 struct rmtcallres r; 228 struct rpc_msg msg; 229 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; 230 231 if ((unix_auth = authunix_create_default()) == NULL) { 232 stat = RPC_AUTHERROR; 233 goto done_broad; 234 } 235 236 /* 237 * initialization: create a socket, a broadcast address, and 238 * preserialize the arguments into a send buffer. 239 */ 240 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 241 stat = RPC_CANTSEND; 242 goto done_broad; 243 } 244 #ifdef SO_BROADCAST 245 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { 246 stat = RPC_CANTSEND; 247 goto done_broad; 248 } 249 #endif /* def SO_BROADCAST */ 250 251 pfd[0].fd = sock; 252 pfd[0].events = POLLIN; 253 254 nets = newgetbroadcastnets(&addrs); 255 if (nets == 0) { 256 stat = RPC_CANTSEND; 257 goto done_broad; 258 } 259 260 memset(&baddr, 0, sizeof (baddr)); 261 baddr.sin_len = sizeof(struct sockaddr_in); 262 baddr.sin_family = AF_INET; 263 baddr.sin_port = htons(PMAPPORT); 264 baddr.sin_addr.s_addr = htonl(INADDR_ANY); 265 msg.rm_xid = xid = arc4random(); 266 msg.rm_direction = CALL; 267 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 268 msg.rm_call.cb_prog = PMAPPROG; 269 msg.rm_call.cb_vers = PMAPVERS; 270 msg.rm_call.cb_proc = PMAPPROC_CALLIT; 271 msg.rm_call.cb_cred = unix_auth->ah_cred; 272 msg.rm_call.cb_verf = unix_auth->ah_verf; 273 a.prog = prog; 274 a.vers = vers; 275 a.proc = proc; 276 a.xdr_args = xargs; 277 a.args_ptr = argsp; 278 r.port_ptr = &port; 279 r.xdr_results = xresults; 280 r.results_ptr = resultsp; 281 xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE); 282 if (!xdr_callmsg(xdrs, &msg) || !xdr_rmtcall_args(xdrs, &a)) { 283 stat = RPC_CANTENCODEARGS; 284 goto done_broad; 285 } 286 outlen = (int)xdr_getpos(xdrs); 287 xdr_destroy(xdrs); 288 289 /* 290 * Basic loop: broadcast a packet and wait a while for response(s). 291 * The response timeout grows larger per iteration. 292 * 293 * XXX This will loop about 5 times the stop. If there are 294 * lots of signals being received by the process it will quit 295 * send them all in one quick burst, not paying attention to 296 * the intended function of sending them slowly over half a 297 * minute or so 298 */ 299 for (timo = 4000; timo <= 14000; timo += 2000) { 300 for (i = 0; i < nets; i++) { 301 baddr.sin_addr = addrs[i]; 302 if (sendto(sock, outbuf, outlen, 0, 303 (struct sockaddr *)&baddr, 304 sizeof (struct sockaddr)) != outlen) { 305 stat = RPC_CANTSEND; 306 goto done_broad; 307 } 308 } 309 if (eachresult == NULL) { 310 stat = RPC_SUCCESS; 311 goto done_broad; 312 } 313 recv_again: 314 msg.acpted_rply.ar_verf = _null_auth; 315 msg.acpted_rply.ar_results.where = (caddr_t)&r; 316 msg.acpted_rply.ar_results.proc = xdr_rmtcallres; 317 318 switch (poll(pfd, 1, timo)) { 319 case 0: /* timed out */ 320 stat = RPC_TIMEDOUT; 321 continue; 322 case 1: 323 if (pfd[0].revents & POLLNVAL) 324 errno = EBADF; 325 else if (pfd[0].revents & POLLERR) 326 errno = EIO; 327 else 328 break; 329 /* FALLTHROUGH */ 330 case -1: /* some kind of error */ 331 if (errno == EINTR) 332 goto recv_again; 333 stat = RPC_CANTRECV; 334 goto done_broad; 335 } 336 try_again: 337 fromlen = sizeof(struct sockaddr); 338 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, 339 (struct sockaddr *)&raddr, &fromlen); 340 if (inlen < 0) { 341 if (errno == EINTR) 342 goto try_again; 343 stat = RPC_CANTRECV; 344 goto done_broad; 345 } 346 if (inlen < sizeof(u_int32_t)) 347 goto recv_again; 348 /* 349 * see if reply transaction id matches sent id. 350 * If so, decode the results. 351 */ 352 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE); 353 if (xdr_replymsg(xdrs, &msg)) { 354 if ((msg.rm_xid == xid) && 355 (msg.rm_reply.rp_stat == MSG_ACCEPTED) && 356 (msg.acpted_rply.ar_stat == SUCCESS)) { 357 raddr.sin_port = htons((u_short)port); 358 done = (*eachresult)(resultsp, &raddr); 359 } 360 /* otherwise, we just ignore the errors ... */ 361 } 362 xdrs->x_op = XDR_FREE; 363 msg.acpted_rply.ar_results.proc = xdr_void; 364 (void)xdr_replymsg(xdrs, &msg); 365 (void)(*xresults)(xdrs, resultsp); 366 xdr_destroy(xdrs); 367 if (done) { 368 stat = RPC_SUCCESS; 369 goto done_broad; 370 } else { 371 goto recv_again; 372 } 373 } 374 done_broad: 375 if (addrs) 376 free(addrs); 377 if (sock >= 0) 378 (void)close(sock); 379 if (unix_auth != NULL) 380 AUTH_DESTROY(unix_auth); 381 return (stat); 382 } 383