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