1 /* * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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14 * modification or enhancement.
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18 * OR ANY PART THEREOF.
20 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
21 * or profits or other special, indirect and consequential damages, even if
22 * Sun has been advised of the possibility of such damages.
24 * Sun Microsystems, Inc.
26 * Mountain View, California 94043
30 /* * xdr_rec.c, Implements TCP/IP based XDR streams with a "record marking"
31 * layer above tcp (for rpc's use).
33 * Copyright (C) 1984, Sun Microsystems, Inc.
35 * These routines interface XDRSTREAMS to a tcp/ip connection.
36 * There is a record marking layer between the xdr stream
37 * and the tcp transport level. A record is composed on one or more
38 * record fragments. A record fragment is a thirty-two bit header followed
39 * by n bytes of data, where n is contained in the header. The header
40 * is represented as a htonl(afs_uint32). Thegh order bit encodes
41 * whether or not the fragment is the last fragment of the record
42 * (1 => fragment is last, 0 => more fragments to follow.
43 * The other 31 bits encode the byte length of the fragment.
46 #include <afsconfig.h>
47 #include <afs/param.h>
57 #include <netinet/in.h>
63 /* * A record is composed of one or more record fragments.
64 * A record fragment is a two-byte header followed by zero to
65 * 2**32-1 bytes. The header is treated as an afs_int32 unsigned and is
66 * encode/decoded to the network via htonl/ntohl. The low order 31 bits
67 * are a byte count of the fragment. The highest order bit is a boolean:
68 * 1 => this fragment is the last fragment of the record,
69 * 0 => this fragment is followed by more fragment(s).
71 * The fragment/record machinery is not general; it is constructed to
72 * meet the needs of xdr and rpc based on tcp.
75 #define LAST_FRAG ((afs_uint32)(1 << 31))
77 typedef struct rec_strm {
81 int (*writeit) (caddr_t tcp_handle, caddr_t out_base, int len);
82 caddr_t out_base; /* output buffer (points to frag header) */
83 caddr_t out_finger; /* next output position */
84 caddr_t out_boundry; /* data cannot up to this address */
85 afs_uint32 *frag_header; /* beginning of curren fragment */
86 bool_t frag_sent; /* true if buffer sent in middle of record */
89 int (*readit) (caddr_t tcp_handle, caddr_t out_base, int len);
90 afs_uint32 in_size; /* fixed size of the input buffer */
92 caddr_t in_finger; /* location of next byte to be had */
93 caddr_t in_boundry; /* can read up to this location */
94 afs_int32 fbtbc; /* fragment bytes to be consumed */
100 /* Prototypes for static routines */
101 static bool_t xdrrec_getint32(XDR * xdrs, afs_int32 * lp);
102 static bool_t xdrrec_putint32(XDR * xdrs, afs_int32 * lp);
103 static bool_t xdrrec_getbytes(XDR * xdrs, caddr_t addr,
105 static bool_t xdrrec_putbytes(XDR * xdrs, caddr_t addr,
107 static u_int xdrrec_getpos(XDR * xdrs);
108 static bool_t xdrrec_setpos(XDR * xdrs, u_int pos);
109 static afs_int32 *xdrrec_inline(XDR * xdrs, u_int len);
110 static void xdrrec_destroy(XDR * xdrs);
111 static bool_t flush_out(RECSTREAM * rstrm, bool_t eor);
112 static bool_t fill_input_buf(RECSTREAM * rstrm);
113 static bool_t get_input_bytes(RECSTREAM * rstrm,
114 caddr_t addr, int len);
115 static bool_t set_input_fragment(RECSTREAM * rstrm);
116 static bool_t skip_input_bytes(RECSTREAM * rstrm, int cnt);
117 static u_int fix_buf_size(u_int s);
119 static struct xdr_ops xdrrec_ops = {
120 .x_getint32 = xdrrec_getint32,
121 .x_putint32 = xdrrec_putint32,
122 .x_getbytes = xdrrec_getbytes,
123 .x_putbytes = xdrrec_putbytes,
124 .x_getpos = xdrrec_getpos,
125 .x_setpos = xdrrec_setpos,
126 .x_inline = xdrrec_inline,
127 .x_destroy = xdrrec_destroy
130 /* * Create an xdr handle for xdrrec
131 * xdrrec_create fills in xdrs. Sendsize and recvsize are
132 * send and recv buffer sizes (0 => use default).
133 * tcp_handle is an opaque handle that is passed as the first parameter to
134 * the procedures readit and writeit. Readit and writeit are read and
135 * write respectively. They are like the system
136 * calls expect that they take an opaque handle rather than an fd.
139 int (*readit)(); * like read, but pass it a tcp_handle, not sock *
140 int (*writeit)(); * like write, but pass it a tcp_handle, not sock *
143 xdrrec_create(XDR * xdrs, u_int sendsize, u_int recvsize,
144 caddr_t tcp_handle, int (*readit) (caddr_t tcp_handle,
145 caddr_t out_base, int len),
146 int (*writeit) (caddr_t tcp_handle, caddr_t out_base, int len))
148 RECSTREAM *rstrm = (RECSTREAM *) osi_alloc(sizeof(RECSTREAM));
152 * This is bad. Should rework xdrrec_create to
153 * return a handle, and in this case return NULL
157 xdrs->x_ops = &xdrrec_ops;
158 xdrs->x_private = (caddr_t) rstrm;
159 rstrm->tcp_handle = tcp_handle;
160 rstrm->readit = readit;
161 rstrm->writeit = writeit;
162 sendsize = fix_buf_size(sendsize);
163 if ((rstrm->out_base = rstrm->out_finger = rstrm->out_boundry =
164 osi_alloc(sendsize)) == NULL) {
167 rstrm->frag_header = (afs_uint32 *) rstrm->out_base;
168 rstrm->out_finger += sizeof(afs_uint32);
169 rstrm->out_boundry += sendsize;
170 rstrm->frag_sent = FALSE;
171 rstrm->in_size = recvsize = fix_buf_size(recvsize);
172 if ((rstrm->in_base = rstrm->in_boundry = osi_alloc(recvsize)) == NULL) {
175 rstrm->in_finger = (rstrm->in_boundry += recvsize);
177 rstrm->last_frag = TRUE;
178 rstrm->sendsize = sendsize;
179 rstrm->recvsize = recvsize;
183 /* * The reoutines defined below are the xdr ops which will go into the
184 * xdr handle filled in by xdrrec_create.
188 xdrrec_getint32(XDR * xdrs, afs_int32 * lp)
190 RECSTREAM *rstrm = (RECSTREAM *) (xdrs->x_private);
191 afs_int32 *buflp = (afs_int32 *) (rstrm->in_finger);
194 /* first try the inline, fast case */
195 if ((rstrm->fbtbc >= sizeof(afs_int32))
196 && (((int)((char *)rstrm->in_boundry - (char *)buflp)) >= sizeof(afs_int32))) {
198 rstrm->fbtbc -= sizeof(afs_int32);
199 rstrm->in_finger += sizeof(afs_int32);
201 if (!xdrrec_getbytes(xdrs, (caddr_t) & myint32, sizeof(afs_int32)))
203 *lp = ntohl(myint32);
209 xdrrec_putint32(XDR * xdrs, afs_int32 * lp)
211 RECSTREAM *rstrm = (RECSTREAM *) (xdrs->x_private);
212 afs_int32 *dest_lp = ((afs_int32 *) (rstrm->out_finger));
214 if ((rstrm->out_finger += sizeof(afs_int32)) > rstrm->out_boundry) {
216 * this case should almost never happen so the code is
219 rstrm->out_finger -= sizeof(afs_int32);
220 rstrm->frag_sent = TRUE;
221 if (!flush_out(rstrm, FALSE))
223 dest_lp = ((afs_int32 *) (rstrm->out_finger));
224 rstrm->out_finger += sizeof(afs_int32);
226 *dest_lp = htonl(*lp);
231 xdrrec_getbytes(XDR * xdrs, caddr_t addr, u_int len)
233 RECSTREAM *rstrm = (RECSTREAM *) (xdrs->x_private);
237 current = rstrm->fbtbc;
239 if (rstrm->last_frag)
241 if (!set_input_fragment(rstrm))
245 current = (len < current) ? len : current;
246 if (!get_input_bytes(rstrm, addr, current))
249 rstrm->fbtbc -= current;
256 xdrrec_putbytes(XDR * xdrs, caddr_t addr, u_int len)
258 RECSTREAM *rstrm = (RECSTREAM *) (xdrs->x_private);
262 current = (u_int) (rstrm->out_boundry - rstrm->out_finger);
263 current = (len < current) ? len : current;
264 memcpy(rstrm->out_finger, addr, current);
265 rstrm->out_finger += current;
268 if (rstrm->out_finger == rstrm->out_boundry) {
269 rstrm->frag_sent = TRUE;
270 if (!flush_out(rstrm, FALSE))
278 xdrrec_getpos(XDR * xdrs)
280 RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
283 pos = (u_int) lseek((int)rstrm->tcp_handle, 0, 1);
285 switch (xdrs->x_op) {
288 pos += (u_int)(rstrm->out_finger - rstrm->out_base);
292 pos -= (u_int)(rstrm->in_boundry - rstrm->in_finger);
303 xdrrec_setpos(XDR * xdrs, u_int pos)
305 RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
306 u_int currpos = xdrrec_getpos(xdrs);
307 int delta = currpos - pos;
310 if ((int)currpos != -1)
311 switch (xdrs->x_op) {
314 newpos = rstrm->out_finger - delta;
315 if ((newpos > (caddr_t) (rstrm->frag_header))
316 && (newpos < rstrm->out_boundry)) {
317 rstrm->out_finger = newpos;
323 newpos = rstrm->in_finger - delta;
324 if ((delta < (int)(rstrm->fbtbc)) && (newpos <= rstrm->in_boundry)
325 && (newpos >= rstrm->in_base)) {
326 rstrm->in_finger = newpos;
327 rstrm->fbtbc -= delta;
336 xdrrec_inline(XDR * xdrs, u_int len)
338 RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
339 afs_int32 *buf = NULL;
341 switch (xdrs->x_op) {
344 if ((rstrm->out_finger + len) <= rstrm->out_boundry) {
345 buf = (afs_int32 *) rstrm->out_finger;
346 rstrm->out_finger += len;
351 if ((len <= rstrm->fbtbc)
352 && ((rstrm->in_finger + len) <= rstrm->in_boundry)) {
353 buf = (afs_int32 *) rstrm->in_finger;
355 rstrm->in_finger += len;
363 xdrrec_destroy(XDR * xdrs)
365 RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
367 osi_free(rstrm->out_base, rstrm->sendsize);
368 osi_free(rstrm->in_base, rstrm->recvsize);
369 osi_free((caddr_t) rstrm, sizeof(RECSTREAM));
374 * Exported routines to manage xdr records
378 * Before reading (deserializing from the stream, one should always call
379 * this procedure to guarantee proper record alignment.
382 xdrrec_skiprecord(XDR * xdrs)
384 RECSTREAM *rstrm = (RECSTREAM *) (xdrs->x_private);
386 while (rstrm->fbtbc > 0 || (!rstrm->last_frag)) {
387 if (!skip_input_bytes(rstrm, rstrm->fbtbc))
390 if ((!rstrm->last_frag) && (!set_input_fragment(rstrm)))
393 rstrm->last_frag = FALSE;
398 * Look ahead fuction.
399 * Returns TRUE iff there is no more input in the buffer
400 * after consuming the rest of the current record.
403 xdrrec_eof(XDR * xdrs)
405 RECSTREAM *rstrm = (RECSTREAM *) (xdrs->x_private);
407 while (rstrm->fbtbc > 0 || (!rstrm->last_frag)) {
408 if (!skip_input_bytes(rstrm, rstrm->fbtbc))
411 if ((!rstrm->last_frag) && (!set_input_fragment(rstrm)))
414 if (rstrm->in_finger == rstrm->in_boundry)
420 * The client must tell the package when an end-of-record has occurred.
421 * The second paraemters tells whether the record should be flushed to the
422 * (output) tcp stream. (This let's the package support batched or
423 * pipelined procedure calls.) TRUE => immmediate flush to tcp connection.
426 xdrrec_endofrecord(XDR * xdrs, bool_t sendnow)
428 RECSTREAM *rstrm = (RECSTREAM *) (xdrs->x_private);
429 afs_uint32 len; /* fragment length */
431 if (sendnow || rstrm->frag_sent
432 || ((afs_uint32) (rstrm->out_finger + sizeof(afs_uint32)) >=
433 (afs_uint32) rstrm->out_boundry)) {
434 rstrm->frag_sent = FALSE;
435 return (flush_out(rstrm, TRUE));
438 (afs_uint32) (rstrm->out_finger - (caddr_t)rstrm->frag_header) -
440 *(rstrm->frag_header) = htonl(len | LAST_FRAG);
441 rstrm->frag_header = (afs_uint32 *) rstrm->out_finger;
442 rstrm->out_finger += sizeof(afs_uint32);
448 * Internal useful routines
451 flush_out(RECSTREAM * rstrm, bool_t eor)
453 afs_uint32 eormask = (eor == TRUE) ? LAST_FRAG : 0;
455 (afs_uint32) (rstrm->out_finger - (caddr_t)rstrm->frag_header) -
458 *(rstrm->frag_header) = htonl(len | eormask);
459 len = (afs_uint32) (rstrm->out_finger) - (afs_uint32) (rstrm->out_base);
460 if ((*(rstrm->writeit)) (rstrm->tcp_handle, rstrm->out_base, (int)len)
463 rstrm->frag_header = (afs_uint32 *) rstrm->out_base;
464 rstrm->out_finger = (caddr_t) rstrm->out_base + sizeof(afs_uint32);
469 fill_input_buf(RECSTREAM * rstrm)
471 caddr_t where = rstrm->in_base;
472 int len = rstrm->in_size;
473 u_int adjust = (u_int) ((size_t)rstrm->in_boundry % BYTES_PER_XDR_UNIT);
475 /* Bump the current position out to the next alignment boundary */
479 if ((len = (*(rstrm->readit)) (rstrm->tcp_handle, where, len)) == -1)
481 rstrm->in_finger = where;
483 rstrm->in_boundry = where;
488 get_input_bytes(RECSTREAM * rstrm, caddr_t addr,
494 current = (int)(rstrm->in_boundry - rstrm->in_finger);
496 if (!fill_input_buf(rstrm))
500 current = (len < current) ? len : current;
501 memcpy(addr, rstrm->in_finger, current);
502 rstrm->in_finger += current;
509 /* next two bytes of the input stream are treated as a header */
511 set_input_fragment(RECSTREAM * rstrm)
515 if (!get_input_bytes(rstrm, (caddr_t) & header, sizeof(header)))
517 header = ntohl(header);
518 rstrm->last_frag = ((header & LAST_FRAG) == 0) ? FALSE : TRUE;
519 rstrm->fbtbc = header & (~LAST_FRAG);
523 /* consumes input bytes; knows nothing about records! */
525 skip_input_bytes(RECSTREAM * rstrm, int cnt)
530 current = (int)(rstrm->in_boundry - rstrm->in_finger);
532 if (!fill_input_buf(rstrm))
536 current = (cnt < current) ? cnt : current;
537 rstrm->in_finger += current;
544 fix_buf_size(u_int s)
549 return ((s + BYTES_PER_XDR_UNIT - 1) / BYTES_PER_XDR_UNIT)
550 * BYTES_PER_XDR_UNIT;