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