Patrick Schaaf | 2dd59ef | 2012-02-27 22:27:31 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Sun RPC is a product of Sun Microsystems, Inc. and is provided for |
| 3 | * unrestricted use provided that this legend is included on all tape |
| 4 | * media and as a part of the software program in whole or part. Users |
| 5 | * may copy or modify Sun RPC without charge, but are not authorized |
| 6 | * to license or distribute it to anyone else except as part of a product or |
| 7 | * program developed by the user. |
| 8 | * |
| 9 | * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE |
| 10 | * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR |
| 11 | * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. |
| 12 | * |
| 13 | * Sun RPC is provided with no support and without any obligation on the |
| 14 | * part of Sun Microsystems, Inc. to assist in its use, correction, |
| 15 | * modification or enhancement. |
| 16 | * |
| 17 | * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE |
| 18 | * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC |
| 19 | * OR ANY PART THEREOF. |
| 20 | * |
| 21 | * In no event will Sun Microsystems, Inc. be liable for any lost revenue |
| 22 | * or profits or other special, indirect and consequential damages, even if |
| 23 | * Sun has been advised of the possibility of such damages. |
| 24 | * |
| 25 | * Sun Microsystems, Inc. |
| 26 | * 2550 Garcia Avenue |
| 27 | * Mountain View, California 94043 |
| 28 | */ |
| 29 | |
| 30 | /* |
| 31 | * clnt_unix.c, Implements a TCP/IP based, client side RPC. |
| 32 | * |
| 33 | * Copyright (C) 1984, Sun Microsystems, Inc. |
| 34 | * |
| 35 | * TCP based RPC supports 'batched calls'. |
| 36 | * A sequence of calls may be batched-up in a send buffer. The rpc call |
| 37 | * return immediately to the client even though the call was not necessarily |
| 38 | * sent. The batching occurs if the results' xdr routine is NULL (0) AND |
| 39 | * the rpc timeout value is zero (see clnt.h, rpc). |
| 40 | * |
| 41 | * Clients should NOT casually batch calls that in fact return results; that is, |
| 42 | * the server side should be aware that a call is batched and not produce any |
| 43 | * return message. Batched calls that produce many result messages can |
| 44 | * deadlock (netlock) the client and the server.... |
| 45 | * |
| 46 | * Now go hang yourself. |
| 47 | */ |
| 48 | |
| 49 | #define __FORCE_GLIBC |
| 50 | #include <features.h> |
| 51 | |
| 52 | #include <netdb.h> |
| 53 | #include <errno.h> |
| 54 | #include <stdio.h> |
| 55 | #include <unistd.h> |
maxwen | 27116ba | 2015-08-14 21:41:28 +0200 | [diff] [blame] | 56 | #include <string.h> |
Patrick Schaaf | 2dd59ef | 2012-02-27 22:27:31 +0100 | [diff] [blame] | 57 | #include <rpc/rpc.h> |
| 58 | #include <sys/uio.h> |
| 59 | #include <sys/poll.h> |
| 60 | #include <sys/socket.h> |
| 61 | #include <rpc/pmap_clnt.h> |
| 62 | #ifdef USE_IN_LIBIO |
| 63 | # include <wchar.h> |
| 64 | #endif |
| 65 | |
| 66 | |
| 67 | extern u_long _create_xid (void) attribute_hidden; |
| 68 | |
| 69 | #define MCALL_MSG_SIZE 24 |
| 70 | |
| 71 | struct ct_data |
| 72 | { |
| 73 | int ct_sock; |
| 74 | bool_t ct_closeit; |
| 75 | struct timeval ct_wait; |
| 76 | bool_t ct_waitset; /* wait set by clnt_control? */ |
| 77 | struct sockaddr_un ct_addr; |
| 78 | struct rpc_err ct_error; |
| 79 | char ct_mcall[MCALL_MSG_SIZE]; /* marshalled callmsg */ |
| 80 | u_int ct_mpos; /* pos after marshal */ |
| 81 | XDR ct_xdrs; |
| 82 | }; |
| 83 | |
| 84 | static int readunix (char *, char *, int); |
| 85 | static int writeunix (char *, char *, int); |
| 86 | |
| 87 | static enum clnt_stat clntunix_call (CLIENT *, u_long, xdrproc_t, caddr_t, |
| 88 | xdrproc_t, caddr_t, struct timeval); |
| 89 | static void clntunix_abort (void); |
| 90 | static void clntunix_geterr (CLIENT *, struct rpc_err *); |
| 91 | static bool_t clntunix_freeres (CLIENT *, xdrproc_t, caddr_t); |
| 92 | static bool_t clntunix_control (CLIENT *, int, char *); |
| 93 | static void clntunix_destroy (CLIENT *); |
| 94 | |
| 95 | static const struct clnt_ops unix_ops = |
| 96 | { |
| 97 | clntunix_call, |
| 98 | clntunix_abort, |
| 99 | clntunix_geterr, |
| 100 | clntunix_freeres, |
| 101 | clntunix_destroy, |
| 102 | clntunix_control |
| 103 | }; |
| 104 | |
| 105 | /* |
| 106 | * Create a client handle for a tcp/ip connection. |
| 107 | * If *sockp<0, *sockp is set to a newly created TCP socket and it is |
| 108 | * connected to raddr. If *sockp non-negative then |
| 109 | * raddr is ignored. The rpc/tcp package does buffering |
| 110 | * similar to stdio, so the client must pick send and receive buffer sizes,]; |
| 111 | * 0 => use the default. |
| 112 | * If raddr->sin_port is 0, then a binder on the remote machine is |
| 113 | * consulted for the right port number. |
| 114 | * NB: *sockp is copied into a private area. |
| 115 | * NB: It is the clients responsibility to close *sockp. |
| 116 | * NB: The rpch->cl_auth is set null authentication. Caller may wish to set this |
| 117 | * something more useful. |
| 118 | */ |
| 119 | CLIENT * |
| 120 | clntunix_create (struct sockaddr_un *raddr, u_long prog, u_long vers, |
| 121 | int *sockp, u_int sendsz, u_int recvsz) |
| 122 | { |
| 123 | CLIENT *h; |
| 124 | struct ct_data *ct = (struct ct_data *) mem_alloc (sizeof (*ct)); |
| 125 | struct rpc_msg call_msg; |
| 126 | int len; |
| 127 | |
| 128 | h = (CLIENT *) mem_alloc (sizeof (*h)); |
| 129 | if (h == NULL || ct == NULL) |
| 130 | { |
| 131 | struct rpc_createerr *ce = &get_rpc_createerr (); |
| 132 | #ifdef USE_IN_LIBIO |
| 133 | if (_IO_fwide (stderr, 0) > 0) |
| 134 | (void) fwprintf (stderr, L"%s", |
| 135 | _("clntunix_create: out of memory\n")); |
| 136 | else |
| 137 | #endif |
| 138 | (void) fputs (_("clntunix_create: out of memory\n"), stderr); |
| 139 | ce->cf_stat = RPC_SYSTEMERROR; |
| 140 | ce->cf_error.re_errno = ENOMEM; |
| 141 | goto fooy; |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * If no socket given, open one |
| 146 | */ |
| 147 | if (*sockp < 0) |
| 148 | { |
| 149 | *sockp = socket (AF_UNIX, SOCK_STREAM, 0); |
| 150 | len = strlen (raddr->sun_path) + sizeof (raddr->sun_family) + 1; |
| 151 | if (*sockp < 0 |
| 152 | || connect (*sockp, (struct sockaddr *) raddr, len) < 0) |
| 153 | { |
| 154 | struct rpc_createerr *ce = &get_rpc_createerr (); |
| 155 | ce->cf_stat = RPC_SYSTEMERROR; |
| 156 | ce->cf_error.re_errno = errno; |
| 157 | if (*sockp != -1) |
| 158 | close (*sockp); |
| 159 | goto fooy; |
| 160 | } |
| 161 | ct->ct_closeit = TRUE; |
| 162 | } |
| 163 | else |
| 164 | { |
| 165 | ct->ct_closeit = FALSE; |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * Set up private data struct |
| 170 | */ |
| 171 | ct->ct_sock = *sockp; |
| 172 | ct->ct_wait.tv_usec = 0; |
| 173 | ct->ct_waitset = FALSE; |
| 174 | ct->ct_addr = *raddr; |
| 175 | |
| 176 | /* |
| 177 | * Initialize call message |
| 178 | */ |
| 179 | call_msg.rm_xid = _create_xid (); |
| 180 | call_msg.rm_direction = CALL; |
| 181 | call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; |
| 182 | call_msg.rm_call.cb_prog = prog; |
| 183 | call_msg.rm_call.cb_vers = vers; |
| 184 | |
| 185 | /* |
| 186 | * pre-serialize the static part of the call msg and stash it away |
| 187 | */ |
| 188 | xdrmem_create (&(ct->ct_xdrs), ct->ct_mcall, MCALL_MSG_SIZE, XDR_ENCODE); |
| 189 | if (!xdr_callhdr (&(ct->ct_xdrs), &call_msg)) |
| 190 | { |
| 191 | if (ct->ct_closeit) |
| 192 | close (*sockp); |
| 193 | goto fooy; |
| 194 | } |
| 195 | ct->ct_mpos = XDR_GETPOS (&(ct->ct_xdrs)); |
| 196 | XDR_DESTROY (&(ct->ct_xdrs)); |
| 197 | |
| 198 | /* |
| 199 | * Create a client handle which uses xdrrec for serialization |
| 200 | * and authnone for authentication. |
| 201 | */ |
| 202 | xdrrec_create (&(ct->ct_xdrs), sendsz, recvsz, |
| 203 | (caddr_t) ct, readunix, writeunix); |
| 204 | h->cl_ops = &unix_ops; |
| 205 | h->cl_private = (caddr_t) ct; |
| 206 | h->cl_auth = authnone_create (); |
| 207 | return h; |
| 208 | |
| 209 | fooy: |
| 210 | /* |
| 211 | * Something goofed, free stuff and barf |
| 212 | */ |
| 213 | mem_free ((caddr_t) ct, sizeof (struct ct_data)); |
| 214 | mem_free ((caddr_t) h, sizeof (CLIENT)); |
| 215 | return (CLIENT *) NULL; |
| 216 | } |
| 217 | libc_hidden_def(clntunix_create) |
| 218 | |
| 219 | static enum clnt_stat |
| 220 | clntunix_call (CLIENT *h, u_long proc, xdrproc_t xdr_args, caddr_t args_ptr, |
| 221 | xdrproc_t xdr_results, caddr_t results_ptr, |
| 222 | struct timeval timeout) |
| 223 | { |
| 224 | struct ct_data *ct = (struct ct_data *) h->cl_private; |
| 225 | XDR *xdrs = &(ct->ct_xdrs); |
| 226 | struct rpc_msg reply_msg; |
| 227 | u_long x_id; |
| 228 | u_int32_t *msg_x_id = (u_int32_t *) (ct->ct_mcall); /* yuk */ |
| 229 | bool_t shipnow; |
| 230 | int refreshes = 2; |
| 231 | |
| 232 | if (!ct->ct_waitset) |
| 233 | { |
| 234 | ct->ct_wait = timeout; |
| 235 | } |
| 236 | |
| 237 | shipnow = |
| 238 | (xdr_results == (xdrproc_t) 0 && ct->ct_wait.tv_sec == 0 |
| 239 | && ct->ct_wait.tv_usec == 0) ? FALSE : TRUE; |
| 240 | |
| 241 | call_again: |
| 242 | xdrs->x_op = XDR_ENCODE; |
| 243 | ct->ct_error.re_status = RPC_SUCCESS; |
| 244 | x_id = ntohl (--(*msg_x_id)); |
| 245 | if ((!XDR_PUTBYTES (xdrs, ct->ct_mcall, ct->ct_mpos)) || |
| 246 | (!XDR_PUTLONG (xdrs, (long *) &proc)) || |
| 247 | (!AUTH_MARSHALL (h->cl_auth, xdrs)) || |
| 248 | (!(*xdr_args) (xdrs, args_ptr))) |
| 249 | { |
| 250 | if (ct->ct_error.re_status == RPC_SUCCESS) |
| 251 | ct->ct_error.re_status = RPC_CANTENCODEARGS; |
| 252 | (void) xdrrec_endofrecord (xdrs, TRUE); |
| 253 | return ct->ct_error.re_status; |
| 254 | } |
| 255 | if (!xdrrec_endofrecord (xdrs, shipnow)) |
| 256 | return ct->ct_error.re_status = RPC_CANTSEND; |
| 257 | if (!shipnow) |
| 258 | return RPC_SUCCESS; |
| 259 | /* |
| 260 | * Hack to provide rpc-based message passing |
| 261 | */ |
| 262 | if (ct->ct_wait.tv_sec == 0 && ct->ct_wait.tv_usec == 0) |
| 263 | return ct->ct_error.re_status = RPC_TIMEDOUT; |
| 264 | |
| 265 | |
| 266 | /* |
| 267 | * Keep receiving until we get a valid transaction id |
| 268 | */ |
| 269 | xdrs->x_op = XDR_DECODE; |
| 270 | while (TRUE) |
| 271 | { |
| 272 | reply_msg.acpted_rply.ar_verf = _null_auth; |
| 273 | reply_msg.acpted_rply.ar_results.where = NULL; |
| 274 | reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void; |
| 275 | if (!xdrrec_skiprecord (xdrs)) |
| 276 | return ct->ct_error.re_status; |
| 277 | /* now decode and validate the response header */ |
| 278 | if (!xdr_replymsg (xdrs, &reply_msg)) |
| 279 | { |
| 280 | if (ct->ct_error.re_status == RPC_SUCCESS) |
| 281 | continue; |
| 282 | return ct->ct_error.re_status; |
| 283 | } |
| 284 | if (reply_msg.rm_xid == x_id) |
| 285 | break; |
| 286 | } |
| 287 | |
| 288 | /* |
| 289 | * process header |
| 290 | */ |
| 291 | _seterr_reply (&reply_msg, &(ct->ct_error)); |
| 292 | if (ct->ct_error.re_status == RPC_SUCCESS) |
| 293 | { |
| 294 | if (!AUTH_VALIDATE (h->cl_auth, &reply_msg.acpted_rply.ar_verf)) |
| 295 | { |
| 296 | ct->ct_error.re_status = RPC_AUTHERROR; |
| 297 | ct->ct_error.re_why = AUTH_INVALIDRESP; |
| 298 | } |
| 299 | else if (!(*xdr_results) (xdrs, results_ptr)) |
| 300 | { |
| 301 | if (ct->ct_error.re_status == RPC_SUCCESS) |
| 302 | ct->ct_error.re_status = RPC_CANTDECODERES; |
| 303 | } |
| 304 | /* free verifier ... */ |
| 305 | if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) |
| 306 | { |
| 307 | xdrs->x_op = XDR_FREE; |
| 308 | (void) xdr_opaque_auth (xdrs, &(reply_msg.acpted_rply.ar_verf)); |
| 309 | } |
| 310 | } /* end successful completion */ |
| 311 | else |
| 312 | { |
| 313 | /* maybe our credentials need to be refreshed ... */ |
| 314 | if (refreshes-- && AUTH_REFRESH (h->cl_auth)) |
| 315 | goto call_again; |
| 316 | } /* end of unsuccessful completion */ |
| 317 | return ct->ct_error.re_status; |
| 318 | } |
| 319 | |
| 320 | static void |
| 321 | clntunix_geterr (CLIENT *h, struct rpc_err *errp) |
| 322 | { |
| 323 | struct ct_data *ct = (struct ct_data *) h->cl_private; |
| 324 | |
| 325 | *errp = ct->ct_error; |
| 326 | } |
| 327 | |
| 328 | static bool_t |
| 329 | clntunix_freeres (CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr) |
| 330 | { |
| 331 | struct ct_data *ct = (struct ct_data *) cl->cl_private; |
| 332 | XDR *xdrs = &(ct->ct_xdrs); |
| 333 | |
| 334 | xdrs->x_op = XDR_FREE; |
| 335 | return (*xdr_res) (xdrs, res_ptr); |
| 336 | } |
| 337 | |
| 338 | static void |
| 339 | clntunix_abort (void) |
| 340 | { |
| 341 | } |
| 342 | |
| 343 | static bool_t |
| 344 | clntunix_control (CLIENT *cl, int request, char *info) |
| 345 | { |
| 346 | struct ct_data *ct = (struct ct_data *) cl->cl_private; |
| 347 | |
| 348 | |
| 349 | switch (request) |
| 350 | { |
| 351 | case CLSET_FD_CLOSE: |
| 352 | ct->ct_closeit = TRUE; |
| 353 | break; |
| 354 | case CLSET_FD_NCLOSE: |
| 355 | ct->ct_closeit = FALSE; |
| 356 | break; |
| 357 | case CLSET_TIMEOUT: |
| 358 | ct->ct_wait = *(struct timeval *) info; |
| 359 | break; |
| 360 | case CLGET_TIMEOUT: |
| 361 | *(struct timeval *) info = ct->ct_wait; |
| 362 | break; |
| 363 | case CLGET_SERVER_ADDR: |
| 364 | *(struct sockaddr_un *) info = ct->ct_addr; |
| 365 | break; |
| 366 | case CLGET_FD: |
| 367 | *(int *)info = ct->ct_sock; |
| 368 | break; |
| 369 | case CLGET_XID: |
| 370 | /* |
| 371 | * use the knowledge that xid is the |
| 372 | * first element in the call structure *. |
| 373 | * This will get the xid of the PREVIOUS call |
| 374 | */ |
| 375 | *(u_long *) info = ntohl (*(u_long *)ct->ct_mcall); |
| 376 | break; |
| 377 | case CLSET_XID: |
| 378 | /* This will set the xid of the NEXT call */ |
| 379 | *(u_long *) ct->ct_mcall = htonl (*(u_long *)info - 1); |
| 380 | /* decrement by 1 as clntunix_call() increments once */ |
| 381 | break; |
| 382 | case CLGET_VERS: |
| 383 | /* |
| 384 | * This RELIES on the information that, in the call body, |
| 385 | * the version number field is the fifth field from the |
| 386 | * begining of the RPC header. MUST be changed if the |
| 387 | * call_struct is changed |
| 388 | */ |
| 389 | *(u_long *) info = ntohl (*(u_long *) (ct->ct_mcall |
| 390 | + 4 * BYTES_PER_XDR_UNIT)); |
| 391 | break; |
| 392 | case CLSET_VERS: |
| 393 | *(u_long *) (ct->ct_mcall + 4 * BYTES_PER_XDR_UNIT) |
| 394 | = htonl (*(u_long *) info); |
| 395 | break; |
| 396 | case CLGET_PROG: |
| 397 | /* |
| 398 | * This RELIES on the information that, in the call body, |
| 399 | * the program number field is the field from the |
| 400 | * begining of the RPC header. MUST be changed if the |
| 401 | * call_struct is changed |
| 402 | */ |
| 403 | *(u_long *) info = ntohl (*(u_long *) (ct->ct_mcall |
| 404 | + 3 * BYTES_PER_XDR_UNIT)); |
| 405 | break; |
| 406 | case CLSET_PROG: |
| 407 | *(u_long *) (ct->ct_mcall + 3 * BYTES_PER_XDR_UNIT) |
| 408 | = htonl(*(u_long *) info); |
| 409 | break; |
| 410 | /* The following are only possible with TI-RPC */ |
| 411 | case CLGET_RETRY_TIMEOUT: |
| 412 | case CLSET_RETRY_TIMEOUT: |
| 413 | case CLGET_SVC_ADDR: |
| 414 | case CLSET_SVC_ADDR: |
| 415 | case CLSET_PUSH_TIMOD: |
| 416 | case CLSET_POP_TIMOD: |
| 417 | default: |
| 418 | return FALSE; |
| 419 | } |
| 420 | return TRUE; |
| 421 | } |
| 422 | |
| 423 | |
| 424 | static void |
| 425 | clntunix_destroy (CLIENT *h) |
| 426 | { |
| 427 | struct ct_data *ct = |
| 428 | (struct ct_data *) h->cl_private; |
| 429 | |
| 430 | if (ct->ct_closeit) |
| 431 | { |
| 432 | (void) close (ct->ct_sock); |
| 433 | } |
| 434 | XDR_DESTROY (&(ct->ct_xdrs)); |
| 435 | mem_free ((caddr_t) ct, sizeof (struct ct_data)); |
| 436 | mem_free ((caddr_t) h, sizeof (CLIENT)); |
| 437 | } |
| 438 | |
| 439 | static int |
| 440 | __msgread (int sock, void *data, size_t cnt) |
| 441 | { |
| 442 | struct iovec iov; |
| 443 | struct msghdr msg; |
| 444 | #ifdef SCM_CREDENTIALS |
| 445 | /*static -why??*/ char cm[CMSG_SPACE(sizeof (struct ucred))]; |
| 446 | #endif |
| 447 | int len; |
| 448 | |
| 449 | iov.iov_base = data; |
| 450 | iov.iov_len = cnt; |
| 451 | |
| 452 | msg.msg_iov = &iov; |
| 453 | msg.msg_iovlen = 1; |
| 454 | msg.msg_name = NULL; |
| 455 | msg.msg_namelen = 0; |
| 456 | #ifdef SCM_CREDENTIALS |
| 457 | msg.msg_control = (caddr_t) &cm; |
| 458 | msg.msg_controllen = CMSG_SPACE(sizeof (struct ucred)); |
| 459 | #endif |
| 460 | msg.msg_flags = 0; |
| 461 | |
| 462 | #ifdef SO_PASSCRED |
| 463 | { |
| 464 | int on = 1; |
| 465 | if (setsockopt (sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on))) |
| 466 | return -1; |
| 467 | } |
| 468 | #endif |
| 469 | |
| 470 | restart: |
| 471 | len = recvmsg (sock, &msg, 0); |
| 472 | if (len >= 0) |
| 473 | { |
| 474 | if (msg.msg_flags & MSG_CTRUNC || len == 0) |
| 475 | return 0; |
| 476 | else |
| 477 | return len; |
| 478 | } |
| 479 | if (errno == EINTR) |
| 480 | goto restart; |
| 481 | return -1; |
| 482 | } |
| 483 | |
| 484 | static int |
| 485 | __msgwrite (int sock, void *data, size_t cnt) |
| 486 | { |
| 487 | #ifndef SCM_CREDENTIALS |
| 488 | /* We cannot implement this reliably. */ |
| 489 | __set_errno (ENOSYS); |
| 490 | return -1; |
| 491 | #else |
| 492 | struct iovec iov; |
| 493 | struct msghdr msg; |
| 494 | struct cmsghdr *cmsg = alloca (CMSG_SPACE(sizeof (struct ucred))); |
| 495 | struct ucred cred; |
| 496 | int len; |
| 497 | |
| 498 | /* XXX I'm not sure, if gete?id() is always correct, or if we should use |
| 499 | get?id(). But since keyserv needs geteuid(), we have no other chance. |
| 500 | It would be much better, if the kernel could pass both to the server. */ |
| 501 | cred.pid = getpid (); |
| 502 | cred.uid = geteuid (); |
| 503 | cred.gid = getegid (); |
| 504 | |
| 505 | memcpy (CMSG_DATA(cmsg), &cred, sizeof (struct ucred)); |
| 506 | cmsg->cmsg_level = SOL_SOCKET; |
| 507 | cmsg->cmsg_type = SCM_CREDENTIALS; |
| 508 | cmsg->cmsg_len = sizeof(*cmsg) + sizeof(struct ucred); |
| 509 | |
| 510 | iov.iov_base = data; |
| 511 | iov.iov_len = cnt; |
| 512 | |
| 513 | msg.msg_iov = &iov; |
| 514 | msg.msg_iovlen = 1; |
| 515 | msg.msg_name = NULL; |
| 516 | msg.msg_namelen = 0; |
| 517 | msg.msg_control = cmsg; |
| 518 | msg.msg_controllen = CMSG_ALIGN(cmsg->cmsg_len); |
| 519 | msg.msg_flags = 0; |
| 520 | |
| 521 | restart: |
| 522 | len = sendmsg (sock, &msg, 0); |
| 523 | if (len >= 0) |
| 524 | return len; |
| 525 | if (errno == EINTR) |
| 526 | goto restart; |
| 527 | return -1; |
| 528 | |
| 529 | #endif |
| 530 | } |
| 531 | |
| 532 | |
| 533 | /* |
| 534 | * Interface between xdr serializer and unix connection. |
| 535 | * Behaves like the system calls, read & write, but keeps some error state |
| 536 | * around for the rpc level. |
| 537 | */ |
| 538 | static int |
| 539 | readunix (char *ctptr, char *buf, int len) |
| 540 | { |
| 541 | struct ct_data *ct = (struct ct_data *) ctptr; |
| 542 | struct pollfd fd; |
| 543 | int milliseconds = ((ct->ct_wait.tv_sec * 1000) |
| 544 | + (ct->ct_wait.tv_usec / 1000)); |
| 545 | |
| 546 | if (len == 0) |
| 547 | return 0; |
| 548 | |
| 549 | fd.fd = ct->ct_sock; |
| 550 | fd.events = POLLIN; |
| 551 | while (TRUE) |
| 552 | { |
| 553 | switch (poll (&fd, 1, milliseconds)) |
| 554 | { |
| 555 | case 0: |
| 556 | ct->ct_error.re_status = RPC_TIMEDOUT; |
| 557 | return -1; |
| 558 | |
| 559 | case -1: |
| 560 | if (errno == EINTR) |
| 561 | continue; |
| 562 | ct->ct_error.re_status = RPC_CANTRECV; |
| 563 | ct->ct_error.re_errno = errno; |
| 564 | return -1; |
| 565 | } |
| 566 | break; |
| 567 | } |
| 568 | switch (len = __msgread (ct->ct_sock, buf, len)) |
| 569 | { |
| 570 | |
| 571 | case 0: |
| 572 | /* premature eof */ |
| 573 | ct->ct_error.re_errno = ECONNRESET; |
| 574 | ct->ct_error.re_status = RPC_CANTRECV; |
| 575 | len = -1; /* it's really an error */ |
| 576 | break; |
| 577 | |
| 578 | case -1: |
| 579 | ct->ct_error.re_errno = errno; |
| 580 | ct->ct_error.re_status = RPC_CANTRECV; |
| 581 | break; |
| 582 | } |
| 583 | return len; |
| 584 | } |
| 585 | |
| 586 | static int |
| 587 | writeunix (char *ctptr, char *buf, int len) |
| 588 | { |
| 589 | int i, cnt; |
| 590 | struct ct_data *ct = (struct ct_data *) ctptr; |
| 591 | |
| 592 | for (cnt = len; cnt > 0; cnt -= i, buf += i) |
| 593 | { |
| 594 | if ((i = __msgwrite (ct->ct_sock, buf, cnt)) == -1) |
| 595 | { |
| 596 | ct->ct_error.re_errno = errno; |
| 597 | ct->ct_error.re_status = RPC_CANTSEND; |
| 598 | return -1; |
| 599 | } |
| 600 | } |
| 601 | return len; |
| 602 | } |