lib/pdu.c

   1 /*
   2    Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as published by
   6    the Free Software Foundation; either version 2.1 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program; if not, see <http://www.gnu.org/licenses/>.
  16 */
  17 #ifdef HAVE_CONFIG_H
  18 #include "config.h"
  19 #endif
  20
  21 #ifdef AROS
  22 #include "aros_compat.h"
  23 #endif
  24
  25 #ifdef WIN32
  26 #include "win32_compat.h"
  27 #else
  28 #include <strings.h>
  29 #include <sys/socket.h>
  30 #endif/*WIN32*/
  31
  32 #ifdef HAVE_NETINET_IN_H
  33 #include <netinet/in.h>
  34 #endif
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <assert.h>
  40 #include <errno.h>
  41 #include "slist.h"
  42 #include "libnfs-zdr.h"
  43 #include "libnfs.h"
  44 #include "libnfs-raw.h"
  45 #include "libnfs-private.h"
  46
  47 struct rpc_pdu *rpc_allocate_pdu(struct rpc_context *rpc, int program, int version, int procedure, rpc_cb cb, void *private_data, zdrproc_t zdr_decode_fn, int zdr_decode_bufsize)
  48 {
  49         struct rpc_pdu *pdu;
  50         struct rpc_msg msg;
  51
  52         assert(rpc->magic == RPC_CONTEXT_MAGIC);
  53
  54         pdu = malloc(sizeof(struct rpc_pdu));
  55         if (pdu == NULL) {
  56                 rpc_set_error(rpc, "Out of memory: Failed to allocate pdu structure");
  57                 return NULL;
  58         }
  59         memset(pdu, 0, sizeof(struct rpc_pdu));
  60         pdu->xid                = rpc->xid++;
  61         pdu->cb                 = cb;
  62         pdu->private_data       = private_data;
  63         pdu->zdr_decode_fn      = zdr_decode_fn;
  64         pdu->zdr_decode_bufsize = zdr_decode_bufsize;
  65
  66         zdrmem_create(&pdu->zdr, rpc->encodebuf, rpc->encodebuflen, ZDR_ENCODE);
  67         if (rpc->is_udp == 0) {
  68                 zdr_setpos(&pdu->zdr, 4); /* skip past the record marker */
  69         }
  70
  71         memset(&msg, 0, sizeof(struct rpc_msg));
  72         msg.xid                = pdu->xid;
  73         msg.direction          = CALL;
  74         msg.body.cbody.rpcvers = RPC_MSG_VERSION;
  75         msg.body.cbody.prog    = program;
  76         msg.body.cbody.vers    = version;
  77         msg.body.cbody.proc    = procedure;
  78         msg.body.cbody.cred    = rpc->auth->ah_cred;
  79         msg.body.cbody.verf    = rpc->auth->ah_verf;
  80
  81         if (zdr_callmsg(&pdu->zdr, &msg) == 0) {
  82                 rpc_set_error(rpc, "zdr_callmsg failed");
  83                 zdr_destroy(&pdu->zdr);
  84                 free(pdu);
  85                 return NULL;
  86         }
  87
  88         return pdu;
  89 }
  90
  91 void rpc_free_pdu(struct rpc_context *rpc, struct rpc_pdu *pdu)
  92 {
  93         assert(rpc->magic == RPC_CONTEXT_MAGIC);
  94
  95         if (pdu->outdata.data != NULL) {
  96                 free(pdu->outdata.data);
  97                 pdu->outdata.data = NULL;
  98         }
  99
 100         if (pdu->zdr_decode_buf != NULL) {
 101                 zdr_free(pdu->zdr_decode_fn, pdu->zdr_decode_buf);
 102                 free(pdu->zdr_decode_buf);
 103                 pdu->zdr_decode_buf = NULL;
 104         }
 105
 106         zdr_destroy(&pdu->zdr);
 107
 108         free(pdu);
 109 }
 110
 111
 112 int rpc_queue_pdu(struct rpc_context *rpc, struct rpc_pdu *pdu)
 113 {
 114         int size, recordmarker;
 115
 116         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 117
 118         size = zdr_getpos(&pdu->zdr);
 119
 120         /* for udp we dont queue, we just send it straight away */
 121         if (rpc->is_udp != 0) {
 122 // XXX add a rpc->udp_dest_sock_size  and get rid of sys/socket.h and netinet/in.h
 123                 if (sendto(rpc->fd, rpc->encodebuf, size, MSG_DONTWAIT, rpc->udp_dest, sizeof(struct sockaddr_in)) < 0) {
 124                         rpc_set_error(rpc, "Sendto failed with errno %s", strerror(errno));
 125                         rpc_free_pdu(rpc, pdu);
 126                         return -1;
 127                 }
 128                 SLIST_ADD_END(&rpc->waitpdu, pdu);
 129                 return 0;
 130         }
 131
 132         /* write recordmarker */
 133         zdr_setpos(&pdu->zdr, 0);
 134         recordmarker = (size - 4) | 0x80000000;
 135         zdr_int(&pdu->zdr, &recordmarker);
 136
 137         pdu->outdata.size = size;
 138         pdu->outdata.data = malloc(pdu->outdata.size);
 139         if (pdu->outdata.data == NULL) {
 140                 rpc_set_error(rpc, "Out of memory. Failed to allocate buffer for pdu\n");
 141                 rpc_free_pdu(rpc, pdu);
 142                 return -1;
 143         }
 144
 145         memcpy(pdu->outdata.data, rpc->encodebuf, pdu->outdata.size);
 146         SLIST_ADD_END(&rpc->outqueue, pdu);
 147
 148         return 0;
 149 }
 150
 151 int rpc_get_pdu_size(char *buf)
 152 {
 153         uint32_t size;
 154
 155         size = ntohl(*(uint32_t *)buf);
 156
 157         return (size & 0x7fffffff) + 4;
 158 }
 159
 160 static int rpc_process_reply(struct rpc_context *rpc, struct rpc_pdu *pdu, ZDR *zdr)
 161 {
 162         struct rpc_msg msg;
 163
 164         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 165
 166         memset(&msg, 0, sizeof(struct rpc_msg));
 167         msg.body.rbody.reply.areply.verf = _null_auth;
 168         if (pdu->zdr_decode_bufsize > 0) {
 169                 if (pdu->zdr_decode_buf != NULL) {
 170                         free(pdu->zdr_decode_buf);
 171                 }
 172                 pdu->zdr_decode_buf = malloc(pdu->zdr_decode_bufsize);
 173                 if (pdu->zdr_decode_buf == NULL) {
 174                         rpc_set_error(rpc, "zdr_replymsg failed in portmap_getport_reply");
 175                         pdu->cb(rpc, RPC_STATUS_ERROR, "Failed to allocate buffer for decoding of ZDR reply", pdu->private_data);
 176                         return 0;
 177                 }
 178                 memset(pdu->zdr_decode_buf, 0, pdu->zdr_decode_bufsize);
 179         }
 180         msg.body.rbody.reply.areply.reply_data.results.where = pdu->zdr_decode_buf;
 181         msg.body.rbody.reply.areply.reply_data.results.proc  = pdu->zdr_decode_fn;
 182
 183         if (zdr_replymsg(zdr, &msg) == 0) {
 184                 rpc_set_error(rpc, "zdr_replymsg failed in portmap_getport_reply");
 185                 pdu->cb(rpc, RPC_STATUS_ERROR, "Message rejected by server", pdu->private_data);
 186                 if (pdu->zdr_decode_buf != NULL) {
 187                         free(pdu->zdr_decode_buf);
 188                         pdu->zdr_decode_buf = NULL;
 189                 }
 190                 return 0;
 191         }
 192         if (msg.body.rbody.stat != MSG_ACCEPTED) {
 193                 pdu->cb(rpc, RPC_STATUS_ERROR, "RPC Packet not accepted by the server", pdu->private_data);
 194                 return 0;
 195         }
 196         switch (msg.body.rbody.reply.areply.stat) {
 197         case SUCCESS:
 198                 pdu->cb(rpc, RPC_STATUS_SUCCESS, pdu->zdr_decode_buf, pdu->private_data);
 199                 break;
 200         case PROG_UNAVAIL:
 201                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program not available", pdu->private_data);
 202                 break;
 203         case PROG_MISMATCH:
 204                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program version mismatch", pdu->private_data);
 205                 break;
 206         case PROC_UNAVAIL:
 207                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Procedure not available", pdu->private_data);
 208                 break;
 209         case GARBAGE_ARGS:
 210                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Garbage arguments", pdu->private_data);
 211                 break;
 212         case SYSTEM_ERR:
 213                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: System Error", pdu->private_data);
 214                 break;
 215         default:
 216                 pdu->cb(rpc, RPC_STATUS_ERROR, "Unknown rpc response from server", pdu->private_data);
 217                 break;
 218         }
 219
 220         return 0;
 221 }
 222
 223 int rpc_process_pdu(struct rpc_context *rpc, char *buf, int size)
 224 {
 225         struct rpc_pdu *pdu;
 226         ZDR zdr;
 227         int pos, recordmarker = 0;
 228         unsigned int xid;
 229         char *reasbuf = NULL;
 230
 231         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 232
 233         memset(&zdr, 0, sizeof(ZDR));
 234
 235         zdrmem_create(&zdr, buf, size, ZDR_DECODE);
 236         if (rpc->is_udp == 0) {
 237                 if (zdr_int(&zdr, &recordmarker) == 0) {
 238                         rpc_set_error(rpc, "zdr_int reading recordmarker failed");
 239                         zdr_destroy(&zdr);
 240                         return -1;
 241                 }
 242                 if (!(recordmarker&0x80000000)) {
 243                         zdr_destroy(&zdr);
 244                         if (rpc_add_fragment(rpc, buf+4, size-4) != 0) {
 245                                 rpc_set_error(rpc, "Failed to queue fragment for reassembly.");
 246                                 return -1;
 247                         }
 248                         return 0;
 249                 }
 250         }
 251
 252         /* reassembly */
 253         if (recordmarker != 0 && rpc->fragments != NULL) {
 254                 struct rpc_fragment *fragment;
 255                 uint32_t total = size - 4;
 256                 char *ptr;
 257
 258                 zdr_destroy(&zdr);
 259                 for (fragment = rpc->fragments; fragment; fragment = fragment->next) {
 260                         total += fragment->size;
 261                 }
 262
 263                 reasbuf = malloc(total);
 264                 if (reasbuf == NULL) {
 265                         rpc_set_error(rpc, "Failed to reassemble PDU");
 266                         rpc_free_all_fragments(rpc);
 267                         return -1;
 268                 }
 269                 ptr = reasbuf;
 270                 for (fragment = rpc->fragments; fragment; fragment = fragment->next) {
 271                         memcpy(ptr, fragment->data, fragment->size);
 272                         ptr += fragment->size;
 273                 }
 274                 memcpy(ptr, buf + 4, size - 4);
 275                 zdrmem_create(&zdr, reasbuf, total, ZDR_DECODE);
 276                 rpc_free_all_fragments(rpc);
 277         }
 278
 279         pos = zdr_getpos(&zdr);
 280         if (zdr_int(&zdr, (int *)&xid) == 0) {
 281                 rpc_set_error(rpc, "zdr_int reading xid failed");
 282                 zdr_destroy(&zdr);
 283                 if (reasbuf != NULL) {
 284                         free(reasbuf);
 285                 }
 286                 return -1;
 287         }
 288         zdr_setpos(&zdr, pos);
 289
 290         for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
 291                 if (pdu->xid != xid) {
 292                         continue;
 293                 }
 294                 if (rpc->is_udp == 0 || rpc->is_broadcast == 0) {
 295                         SLIST_REMOVE(&rpc->waitpdu, pdu);
 296                 }
 297                 if (rpc_process_reply(rpc, pdu, &zdr) != 0) {
 298                         rpc_set_error(rpc, "rpc_procdess_reply failed");
 299                 }
 300                 zdr_destroy(&zdr);
 301                 if (rpc->is_udp == 0 || rpc->is_broadcast == 0) {
 302                         rpc_free_pdu(rpc, pdu);
 303                 }
 304                 if (reasbuf != NULL) {
 305                         free(reasbuf);
 306                 }
 307                 return 0;
 308         }
 309         rpc_set_error(rpc, "No matching pdu found for xid:%d", xid);
 310         zdr_destroy(&zdr);
 311         if (reasbuf != NULL) {
 312                 free(reasbuf);
 313         }
 314         return -1;
 315 }
 316