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(&pdu->zdr, &msg) == 0) {
  87                 rpc_set_error(rpc, "zdr_callmsg failed");
  88                 zdr_destroy(&pdu->zdr);
  89                 free(pdu);
  90                 return NULL;
  91         }
  92
  93         return pdu;
  94 }
  95
  96 void rpc_free_pdu(struct rpc_context *rpc, struct rpc_pdu *pdu)
  97 {
  98         assert(rpc->magic == RPC_CONTEXT_MAGIC);
  99
 100         if (pdu->outdata.data != NULL) {
 101                 free(pdu->outdata.data);
 102                 pdu->outdata.data = NULL;
 103         }
 104
 105         if (pdu->zdr_decode_buf != NULL) {
 106                 zdr_free(pdu->zdr_decode_fn, pdu->zdr_decode_buf);
 107                 free(pdu->zdr_decode_buf);
 108                 pdu->zdr_decode_buf = NULL;
 109         }
 110
 111         zdr_destroy(&pdu->zdr);
 112
 113         free(pdu);
 114 }
 115
 116
 117 int rpc_queue_pdu(struct rpc_context *rpc, struct rpc_pdu *pdu)
 118 {
 119         int size, recordmarker;
 120
 121         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 122
 123         size = zdr_getpos(&pdu->zdr);
 124
 125         /* for udp we dont queue, we just send it straight away */
 126         if (rpc->is_udp != 0) {
 127 // XXX add a rpc->udp_dest_sock_size  and get rid of sys/socket.h and netinet/in.h
 128                 if (sendto(rpc->fd, rpc->encodebuf, size, MSG_DONTWAIT, rpc->udp_dest, sizeof(struct sockaddr_in)) < 0) {
 129                         rpc_set_error(rpc, "Sendto failed with errno %s", strerror(errno));
 130                         rpc_free_pdu(rpc, pdu);
 131                         return -1;
 132                 }
 133                 SLIST_ADD_END(&rpc->waitpdu, pdu);
 134                 return 0;
 135         }
 136
 137         /* write recordmarker */
 138         zdr_setpos(&pdu->zdr, 0);
 139         recordmarker = (size - 4) | 0x80000000;
 140         zdr_int(&pdu->zdr, &recordmarker);
 141
 142         pdu->outdata.size = size;
 143         pdu->outdata.data = malloc(pdu->outdata.size);
 144         if (pdu->outdata.data == NULL) {
 145                 rpc_set_error(rpc, "Out of memory. Failed to allocate buffer for pdu\n");
 146                 rpc_free_pdu(rpc, pdu);
 147                 return -1;
 148         }
 149
 150         memcpy(pdu->outdata.data, rpc->encodebuf, pdu->outdata.size);
 151         SLIST_ADD_END(&rpc->outqueue, pdu);
 152
 153         return 0;
 154 }
 155
 156 int rpc_get_pdu_size(char *buf)
 157 {
 158         uint32_t size;
 159
 160         size = ntohl(*(uint32_t *)buf);
 161
 162         return (size & 0x7fffffff) + 4;
 163 }
 164
 165 static int rpc_process_reply(struct rpc_context *rpc, struct rpc_pdu *pdu, ZDR *zdr)
 166 {
 167         struct rpc_msg msg;
 168
 169         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 170
 171         memset(&msg, 0, sizeof(struct rpc_msg));
 172         msg.body.rbody.reply.areply.verf = _null_auth;
 173         if (pdu->zdr_decode_bufsize > 0) {
 174                 if (pdu->zdr_decode_buf != NULL) {
 175                         free(pdu->zdr_decode_buf);
 176                 }
 177                 pdu->zdr_decode_buf = malloc(pdu->zdr_decode_bufsize);
 178                 if (pdu->zdr_decode_buf == NULL) {
 179                         rpc_set_error(rpc, "zdr_replymsg failed in portmap_getport_reply");
 180                         pdu->cb(rpc, RPC_STATUS_ERROR, "Failed to allocate buffer for decoding of ZDR reply", pdu->private_data);
 181                         return 0;
 182                 }
 183                 memset(pdu->zdr_decode_buf, 0, pdu->zdr_decode_bufsize);
 184         }
 185         msg.body.rbody.reply.areply.reply_data.results.where = pdu->zdr_decode_buf;
 186         msg.body.rbody.reply.areply.reply_data.results.proc  = pdu->zdr_decode_fn;
 187
 188         if (zdr_replymsg(zdr, &msg) == 0) {
 189                 rpc_set_error(rpc, "zdr_replymsg failed in portmap_getport_reply");
 190                 pdu->cb(rpc, RPC_STATUS_ERROR, "Message rejected by server", pdu->private_data);
 191                 if (pdu->zdr_decode_buf != NULL) {
 192                         free(pdu->zdr_decode_buf);
 193                         pdu->zdr_decode_buf = NULL;
 194                 }
 195                 return 0;
 196         }
 197         if (msg.body.rbody.stat != MSG_ACCEPTED) {
 198                 pdu->cb(rpc, RPC_STATUS_ERROR, "RPC Packet not accepted by the server", pdu->private_data);
 199                 return 0;
 200         }
 201         switch (msg.body.rbody.reply.areply.stat) {
 202         case SUCCESS:
 203                 pdu->cb(rpc, RPC_STATUS_SUCCESS, pdu->zdr_decode_buf, pdu->private_data);
 204                 break;
 205         case PROG_UNAVAIL:
 206                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program not available", pdu->private_data);
 207                 break;
 208         case PROG_MISMATCH:
 209                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program version mismatch", pdu->private_data);
 210                 break;
 211         case PROC_UNAVAIL:
 212                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Procedure not available", pdu->private_data);
 213                 break;
 214         case GARBAGE_ARGS:
 215                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Garbage arguments", pdu->private_data);
 216                 break;
 217         case SYSTEM_ERR:
 218                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: System Error", pdu->private_data);
 219                 break;
 220         default:
 221                 pdu->cb(rpc, RPC_STATUS_ERROR, "Unknown rpc response from server", pdu->private_data);
 222                 break;
 223         }
 224
 225         return 0;
 226 }
 227
 228 int rpc_process_pdu(struct rpc_context *rpc, char *buf, int size)
 229 {
 230         struct rpc_pdu *pdu;
 231         ZDR zdr;
 232         int pos, recordmarker = 0;
 233         unsigned int xid;
 234         char *reasbuf = NULL;
 235
 236         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 237
 238         memset(&zdr, 0, sizeof(ZDR));
 239
 240         zdrmem_create(&zdr, buf, size, ZDR_DECODE);
 241         if (rpc->is_udp == 0) {
 242                 if (zdr_int(&zdr, &recordmarker) == 0) {
 243                         rpc_set_error(rpc, "zdr_int reading recordmarker failed");
 244                         zdr_destroy(&zdr);
 245                         return -1;
 246                 }
 247                 if (!(recordmarker&0x80000000)) {
 248                         zdr_destroy(&zdr);
 249                         if (rpc_add_fragment(rpc, buf+4, size-4) != 0) {
 250                                 rpc_set_error(rpc, "Failed to queue fragment for reassembly.");
 251                                 return -1;
 252                         }
 253                         return 0;
 254                 }
 255         }
 256
 257         /* reassembly */
 258         if (recordmarker != 0 && rpc->fragments != NULL) {
 259                 struct rpc_fragment *fragment;
 260                 uint32_t total = size - 4;
 261                 char *ptr;
 262
 263                 zdr_destroy(&zdr);
 264                 for (fragment = rpc->fragments; fragment; fragment = fragment->next) {
 265                         total += fragment->size;
 266                 }
 267
 268                 reasbuf = malloc(total);
 269                 if (reasbuf == NULL) {
 270                         rpc_set_error(rpc, "Failed to reassemble PDU");
 271                         rpc_free_all_fragments(rpc);
 272                         return -1;
 273                 }
 274                 ptr = reasbuf;
 275                 for (fragment = rpc->fragments; fragment; fragment = fragment->next) {
 276                         memcpy(ptr, fragment->data, fragment->size);
 277                         ptr += fragment->size;
 278                 }
 279                 memcpy(ptr, buf + 4, size - 4);
 280                 zdrmem_create(&zdr, reasbuf, total, ZDR_DECODE);
 281                 rpc_free_all_fragments(rpc);
 282         }
 283
 284         pos = zdr_getpos(&zdr);
 285         if (zdr_int(&zdr, (int *)&xid) == 0) {
 286                 rpc_set_error(rpc, "zdr_int reading xid failed");
 287                 zdr_destroy(&zdr);
 288                 if (reasbuf != NULL) {
 289                         free(reasbuf);
 290                 }
 291                 return -1;
 292         }
 293         zdr_setpos(&zdr, pos);
 294
 295         for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
 296                 if (pdu->xid != xid) {
 297                         continue;
 298                 }
 299                 if (rpc->is_udp == 0 || rpc->is_broadcast == 0) {
 300                         SLIST_REMOVE(&rpc->waitpdu, pdu);
 301                 }
 302                 if (rpc_process_reply(rpc, pdu, &zdr) != 0) {
 303                         rpc_set_error(rpc, "rpc_procdess_reply failed");
 304                 }
 305                 zdr_destroy(&zdr);
 306                 if (rpc->is_udp == 0 || rpc->is_broadcast == 0) {
 307                         rpc_free_pdu(rpc, pdu);
 308                 }
 309                 if (reasbuf != NULL) {
 310                         free(reasbuf);
 311                 }
 312                 return 0;
 313         }
 314         rpc_set_error(rpc, "No matching pdu found for xid:%d", xid);
 315         zdr_destroy(&zdr);
 316         if (reasbuf != NULL) {
 317                 free(reasbuf);
 318         }
 319         return -1;
 320 }
 321