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 #endif
  28
  29 #ifdef HAVE_NETINET_IN_H
  30 #include <netinet/in.h>
  31 #endif
  32
  33 #ifdef HAVE_SYS_SOCKET_H
  34 #include <sys/socket.h>
  35 #endif
  36
  37 #ifdef HAVE_STRINGS_H
  38 #include <strings.h>
  39 #endif
  40
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <assert.h>
  45 #include <errno.h>
  46 #include "slist.h"
  47 #include "libnfs-zdr.h"
  48 #include "libnfs.h"
  49 #include "libnfs-raw.h"
  50 #include "libnfs-private.h"
  51
  52 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)
  53 {
  54         struct rpc_pdu *pdu;
  55         struct rpc_msg msg;
  56
  57         assert(rpc->magic == RPC_CONTEXT_MAGIC);
  58
  59         pdu = malloc(sizeof(struct rpc_pdu));
  60         if (pdu == NULL) {
  61                 rpc_set_error(rpc, "Out of memory: Failed to allocate pdu structure");
  62                 return NULL;
  63         }
  64         memset(pdu, 0, sizeof(struct rpc_pdu));
  65         pdu->xid                = rpc->xid++;
  66         pdu->cb                 = cb;
  67         pdu->private_data       = private_data;
  68         pdu->zdr_decode_fn      = zdr_decode_fn;
  69         pdu->zdr_decode_bufsize = zdr_decode_bufsize;
  70
  71         zdrmem_create(&pdu->zdr, rpc->encodebuf, rpc->encodebuflen, ZDR_ENCODE);
  72         if (rpc->is_udp == 0) {
  73                 zdr_setpos(&pdu->zdr, 4); /* skip past the record marker */
  74         }
  75
  76         memset(&msg, 0, sizeof(struct rpc_msg));
  77         msg.xid                = pdu->xid;
  78         msg.direction          = CALL;
  79         msg.body.cbody.rpcvers = RPC_MSG_VERSION;
  80         msg.body.cbody.prog    = program;
  81         msg.body.cbody.vers    = version;
  82         msg.body.cbody.proc    = procedure;
  83         msg.body.cbody.cred    = rpc->auth->ah_cred;
  84         msg.body.cbody.verf    = rpc->auth->ah_verf;
  85
  86         if (zdr_callmsg(rpc, &pdu->zdr, &msg) == 0) {
  87                 rpc_set_error(rpc, "zdr_callmsg failed with %s",
  88                               rpc_get_error(rpc));
  89                 zdr_destroy(&pdu->zdr);
  90                 free(pdu);
  91                 return NULL;
  92         }
  93
  94         return pdu;
  95 }
  96
  97 void rpc_free_pdu(struct rpc_context *rpc, struct rpc_pdu *pdu)
  98 {
  99         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 100
 101         if (pdu->outdata.data != NULL) {
 102                 free(pdu->outdata.data);
 103                 pdu->outdata.data = NULL;
 104         }
 105
 106         if (pdu->zdr_decode_buf != NULL) {
 107                 zdr_free(pdu->zdr_decode_fn, pdu->zdr_decode_buf);
 108                 free(pdu->zdr_decode_buf);
 109                 pdu->zdr_decode_buf = NULL;
 110         }
 111
 112         zdr_destroy(&pdu->zdr);
 113
 114         free(pdu);
 115 }
 116
 117 void rpc_set_next_xid(struct rpc_context *rpc, uint32_t xid)
 118 {
 119         rpc->xid = xid;
 120 }
 121
 122 int rpc_queue_pdu(struct rpc_context *rpc, struct rpc_pdu *pdu)
 123 {
 124         int size, recordmarker;
 125
 126         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 127
 128         size = zdr_getpos(&pdu->zdr);
 129
 130         /* for udp we dont queue, we just send it straight away */
 131         if (rpc->is_udp != 0) {
 132 // XXX add a rpc->udp_dest_sock_size  and get rid of sys/socket.h and netinet/in.h
 133                 if (sendto(rpc->fd, rpc->encodebuf, size, MSG_DONTWAIT, rpc->udp_dest, sizeof(struct sockaddr_in)) < 0) {
 134                         rpc_set_error(rpc, "Sendto failed with errno %s", strerror(errno));
 135                         rpc_free_pdu(rpc, pdu);
 136                         return -1;
 137                 }
 138                 SLIST_ADD_END(&rpc->waitpdu, pdu);
 139                 return 0;
 140         }
 141
 142         /* write recordmarker */
 143         zdr_setpos(&pdu->zdr, 0);
 144         recordmarker = (size - 4) | 0x80000000;
 145         zdr_int(&pdu->zdr, &recordmarker);
 146
 147         pdu->outdata.size = size;
 148         pdu->outdata.data = malloc(pdu->outdata.size);
 149         if (pdu->outdata.data == NULL) {
 150                 rpc_set_error(rpc, "Out of memory. Failed to allocate buffer for pdu\n");
 151                 rpc_free_pdu(rpc, pdu);
 152                 return -1;
 153         }
 154
 155         memcpy(pdu->outdata.data, rpc->encodebuf, pdu->outdata.size);
 156         SLIST_ADD_END(&rpc->outqueue, pdu);
 157
 158         return 0;
 159 }
 160
 161 int rpc_get_pdu_size(char *buf)
 162 {
 163         uint32_t size;
 164
 165         size = ntohl(*(uint32_t *)buf);
 166
 167         return (size & 0x7fffffff) + 4;
 168 }
 169
 170 static int rpc_process_reply(struct rpc_context *rpc, struct rpc_pdu *pdu, ZDR *zdr)
 171 {
 172         struct rpc_msg msg;
 173
 174         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 175
 176         memset(&msg, 0, sizeof(struct rpc_msg));
 177         msg.body.rbody.reply.areply.verf = _null_auth;
 178         if (pdu->zdr_decode_bufsize > 0) {
 179                 if (pdu->zdr_decode_buf != NULL) {
 180                         free(pdu->zdr_decode_buf);
 181                 }
 182                 pdu->zdr_decode_buf = malloc(pdu->zdr_decode_bufsize);
 183                 if (pdu->zdr_decode_buf == NULL) {
 184                         rpc_set_error(rpc, "Failed to allocate memory for "
 185                                       "zdr_encode_buf in rpc_process_reply");
 186                         pdu->cb(rpc, RPC_STATUS_ERROR, "Failed to allocate "
 187                                 "buffer for decoding of ZDR reply",
 188                                 pdu->private_data);
 189                         return 0;
 190                 }
 191                 memset(pdu->zdr_decode_buf, 0, pdu->zdr_decode_bufsize);
 192         }
 193         msg.body.rbody.reply.areply.reply_data.results.where = pdu->zdr_decode_buf;
 194         msg.body.rbody.reply.areply.reply_data.results.proc  = pdu->zdr_decode_fn;
 195
 196         if (zdr_replymsg(rpc, zdr, &msg) == 0) {
 197                 rpc_set_error(rpc, "zdr_replymsg failed in rpc_process_reply: "
 198                               "%s", rpc_get_error(rpc));
 199                 pdu->cb(rpc, RPC_STATUS_ERROR, "Message rejected by server",
 200                         pdu->private_data);
 201                 if (pdu->zdr_decode_buf != NULL) {
 202                         free(pdu->zdr_decode_buf);
 203                         pdu->zdr_decode_buf = NULL;
 204                 }
 205                 return 0;
 206         }
 207         if (msg.body.rbody.stat != MSG_ACCEPTED) {
 208                 pdu->cb(rpc, RPC_STATUS_ERROR, "RPC Packet not accepted by the server", pdu->private_data);
 209                 return 0;
 210         }
 211         switch (msg.body.rbody.reply.areply.stat) {
 212         case SUCCESS:
 213                 pdu->cb(rpc, RPC_STATUS_SUCCESS, pdu->zdr_decode_buf, pdu->private_data);
 214                 break;
 215         case PROG_UNAVAIL:
 216                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program not available", pdu->private_data);
 217                 break;
 218         case PROG_MISMATCH:
 219                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program version mismatch", pdu->private_data);
 220                 break;
 221         case PROC_UNAVAIL:
 222                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Procedure not available", pdu->private_data);
 223                 break;
 224         case GARBAGE_ARGS:
 225                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Garbage arguments", pdu->private_data);
 226                 break;
 227         case SYSTEM_ERR:
 228                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: System Error", pdu->private_data);
 229                 break;
 230         default:
 231                 pdu->cb(rpc, RPC_STATUS_ERROR, "Unknown rpc response from server", pdu->private_data);
 232                 break;
 233         }
 234
 235         return 0;
 236 }
 237
 238 int rpc_process_pdu(struct rpc_context *rpc, char *buf, int size)
 239 {
 240         struct rpc_pdu *pdu;
 241         ZDR zdr;
 242         int pos, recordmarker = 0;
 243         uint32_t xid;
 244         char *reasbuf = NULL;
 245
 246         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 247
 248         memset(&zdr, 0, sizeof(ZDR));
 249
 250         zdrmem_create(&zdr, buf, size, ZDR_DECODE);
 251         if (rpc->is_udp == 0) {
 252                 if (zdr_int(&zdr, &recordmarker) == 0) {
 253                         rpc_set_error(rpc, "zdr_int reading recordmarker failed");
 254                         zdr_destroy(&zdr);
 255                         return -1;
 256                 }
 257                 if (!(recordmarker&0x80000000)) {
 258                         zdr_destroy(&zdr);
 259                         if (rpc_add_fragment(rpc, buf+4, size-4) != 0) {
 260                                 rpc_set_error(rpc, "Failed to queue fragment for reassembly.");
 261                                 return -1;
 262                         }
 263                         return 0;
 264                 }
 265         }
 266
 267         /* reassembly */
 268         if (recordmarker != 0 && rpc->fragments != NULL) {
 269                 struct rpc_fragment *fragment;
 270                 uint32_t total = size - 4;
 271                 char *ptr;
 272
 273                 zdr_destroy(&zdr);
 274                 for (fragment = rpc->fragments; fragment; fragment = fragment->next) {
 275                         total += fragment->size;
 276                 }
 277
 278                 reasbuf = malloc(total);
 279                 if (reasbuf == NULL) {
 280                         rpc_set_error(rpc, "Failed to reassemble PDU");
 281                         rpc_free_all_fragments(rpc);
 282                         return -1;
 283                 }
 284                 ptr = reasbuf;
 285                 for (fragment = rpc->fragments; fragment; fragment = fragment->next) {
 286                         memcpy(ptr, fragment->data, fragment->size);
 287                         ptr += fragment->size;
 288                 }
 289                 memcpy(ptr, buf + 4, size - 4);
 290                 zdrmem_create(&zdr, reasbuf, total, ZDR_DECODE);
 291                 rpc_free_all_fragments(rpc);
 292         }
 293
 294         pos = zdr_getpos(&zdr);
 295         if (zdr_int(&zdr, (int *)&xid) == 0) {
 296                 rpc_set_error(rpc, "zdr_int reading xid failed");
 297                 zdr_destroy(&zdr);
 298                 if (reasbuf != NULL) {
 299                         free(reasbuf);
 300                 }
 301                 return -1;
 302         }
 303         zdr_setpos(&zdr, pos);
 304
 305         for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
 306                 if (pdu->xid != xid) {
 307                         continue;
 308                 }
 309                 if (rpc->is_udp == 0 || rpc->is_broadcast == 0) {
 310                         SLIST_REMOVE(&rpc->waitpdu, pdu);
 311                 }
 312                 if (rpc_process_reply(rpc, pdu, &zdr) != 0) {
 313                         rpc_set_error(rpc, "rpc_procdess_reply failed");
 314                 }
 315                 zdr_destroy(&zdr);
 316                 if (rpc->is_udp == 0 || rpc->is_broadcast == 0) {
 317                         rpc_free_pdu(rpc, pdu);
 318                 }
 319                 if (reasbuf != NULL) {
 320                         free(reasbuf);
 321                 }
 322                 return 0;
 323         }
 324         rpc_set_error(rpc, "No matching pdu found for xid:%d", xid);
 325         zdr_destroy(&zdr);
 326         if (reasbuf != NULL) {
 327                 free(reasbuf);
 328         }
 329         return -1;
 330 }
 331