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
  18 #include <stdio.h>
  19 #include <strings.h>
  20 #include <stdlib.h>
  21 #include <rpc/rpc.h>
  22 #include <rpc/xdr.h>
  23 #include <rpc/rpc_msg.h>
  24 #include "slist.h"
  25 #include "libnfs.h"
  26 #include "libnfs-raw.h"
  27 #include "libnfs-private.h"
  28
  29 struct rpc_pdu *rpc_allocate_pdu(struct rpc_context *rpc, int program, int version, int procedure, rpc_cb cb, void *private_data, xdrproc_t xdr_decode_fn, int xdr_decode_bufsize)
  30 {
  31         struct rpc_pdu *pdu;
  32         struct rpc_msg msg;
  33
  34         if (rpc == NULL) {
  35                 printf("trying to allocate rpc pdu on NULL context\n");
  36                 return NULL;
  37         }
  38
  39         pdu = malloc(sizeof(struct rpc_pdu));
  40         if (pdu == NULL) {
  41                 printf("Failed to allocate pdu structure\n");
  42                 return NULL;
  43         }
  44         bzero(pdu, sizeof(struct rpc_pdu));
  45         pdu->xid                = rpc->xid++;
  46         pdu->cb                 = cb;
  47         pdu->private_data       = private_data;
  48         pdu->xdr_decode_fn      = xdr_decode_fn;
  49         pdu->xdr_decode_bufsize = xdr_decode_bufsize;
  50
  51         xdrmem_create(&pdu->xdr, rpc->encodebuf, rpc->encodebuflen, XDR_ENCODE);
  52         xdr_setpos(&pdu->xdr, 4); /* skip past the record marker */
  53
  54         bzero(&msg, sizeof(struct rpc_msg));
  55         msg.rm_xid = pdu->xid;
  56         msg.rm_direction = CALL;
  57         msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
  58         msg.rm_call.cb_prog = program;
  59         msg.rm_call.cb_vers = version;
  60         msg.rm_call.cb_proc = procedure;
  61         msg.rm_call.cb_cred = rpc->auth->ah_cred;
  62         msg.rm_call.cb_verf = rpc->auth->ah_verf;
  63
  64         if (xdr_callmsg(&pdu->xdr, &msg) == 0) {
  65                 printf("xdr_callmsg failed\n");
  66                 xdr_destroy(&pdu->xdr);
  67                 free(pdu);
  68                 return NULL;
  69         }
  70
  71         return pdu;
  72 }
  73
  74 void rpc_free_pdu(struct rpc_context *rpc _U_, struct rpc_pdu *pdu)
  75 {
  76         if (pdu->outdata.data != NULL) {
  77                 free(pdu->outdata.data);
  78                 pdu->outdata.data = NULL;
  79         }
  80
  81         if (pdu->xdr_decode_buf != NULL) {
  82                 xdr_free(pdu->xdr_decode_fn, pdu->xdr_decode_buf);
  83                 free(pdu->xdr_decode_buf);
  84                 pdu->xdr_decode_buf = NULL;
  85         }
  86
  87         xdr_destroy(&pdu->xdr);
  88         free(pdu);
  89 }
  90
  91
  92 int rpc_queue_pdu(struct rpc_context *rpc, struct rpc_pdu *pdu)
  93 {
  94         int size, recordmarker;
  95
  96         size = xdr_getpos(&pdu->xdr);
  97
  98         /* write recordmarker */
  99         xdr_setpos(&pdu->xdr, 0);
 100         recordmarker = (size - 4) | 0x80000000;
 101         xdr_int(&pdu->xdr, &recordmarker);
 102
 103         pdu->outdata.size = size;
 104         pdu->outdata.data = malloc(pdu->outdata.size);
 105         if (pdu->outdata.data == NULL) {
 106                 rpc_set_error(rpc, "Out of memory. Failed to allocate buffer for pdu\n");
 107                 rpc_free_pdu(rpc, pdu);
 108                 return -1;
 109         }
 110
 111         memcpy(pdu->outdata.data, rpc->encodebuf, pdu->outdata.size);
 112         SLIST_ADD_END(&rpc->outqueue, pdu);
 113
 114         return 0;
 115 }
 116
 117 int rpc_get_pdu_size(char *buf)
 118 {
 119         uint32_t size;
 120
 121         size = ntohl(*(uint32_t *)buf);
 122
 123         if ((size & 0x80000000) == 0) {
 124                 printf("cant handle oncrpc fragments\n");
 125                 return -1;
 126         }
 127
 128         return (size & 0x7fffffff) + 4;
 129 }
 130
 131 static int rpc_process_reply(struct rpc_context *rpc, struct rpc_pdu *pdu, XDR *xdr)
 132 {
 133         struct rpc_msg msg;
 134
 135         bzero(&msg, sizeof(struct rpc_msg));
 136         msg.acpted_rply.ar_verf = _null_auth;
 137         if (pdu->xdr_decode_bufsize > 0) {
 138                 pdu->xdr_decode_buf = malloc(pdu->xdr_decode_bufsize);
 139                 if (pdu->xdr_decode_buf == NULL) {
 140                         printf("xdr_replymsg failed in portmap_getport_reply\n");
 141                         pdu->cb(rpc, RPC_STATUS_ERROR, "Failed to allocate buffer for decoding of XDR reply", pdu->private_data);
 142                         return 0;
 143                 }
 144                 bzero(pdu->xdr_decode_buf, pdu->xdr_decode_bufsize);
 145         }
 146         msg.acpted_rply.ar_results.where = pdu->xdr_decode_buf;
 147         msg.acpted_rply.ar_results.proc  = pdu->xdr_decode_fn;
 148
 149         if (xdr_replymsg(xdr, &msg) == 0) {
 150                 printf("xdr_replymsg failed in portmap_getport_reply\n");
 151                 pdu->cb(rpc, RPC_STATUS_ERROR, "Message rejected by server", pdu->private_data);
 152                 if (pdu->xdr_decode_buf != NULL) {
 153                         free(pdu->xdr_decode_buf);
 154                         pdu->xdr_decode_buf = NULL;
 155                 }
 156                 return 0;
 157         }
 158         if (msg.rm_reply.rp_stat != MSG_ACCEPTED) {
 159                 pdu->cb(rpc, RPC_STATUS_ERROR, "RPC Packet not accepted by the server", pdu->private_data);
 160                 return 0;
 161         }
 162         switch (msg.rm_reply.rp_acpt.ar_stat) {
 163         case SUCCESS:
 164                 pdu->cb(rpc, RPC_STATUS_SUCCESS, pdu->xdr_decode_buf, pdu->private_data);
 165                 break;
 166         case PROG_UNAVAIL:
 167                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program not available", pdu->private_data);
 168                 break;
 169         case PROG_MISMATCH:
 170                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program version mismatch", pdu->private_data);
 171                 break;
 172         case PROC_UNAVAIL:
 173                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Procedure not available", pdu->private_data);
 174                 break;
 175         case GARBAGE_ARGS:
 176                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Garbage arguments", pdu->private_data);
 177                 break;
 178         case SYSTEM_ERR:
 179                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: System Error", pdu->private_data);
 180                 break;
 181         default:
 182                 pdu->cb(rpc, RPC_STATUS_ERROR, "Unknown rpc response from server", pdu->private_data);
 183                 break;
 184         }
 185
 186         return 0;
 187 }
 188
 189 int rpc_process_pdu(struct rpc_context *rpc, char *buf, int size)
 190 {
 191         struct rpc_pdu *pdu;
 192         XDR xdr;
 193         int pos, recordmarker;
 194         unsigned int xid;
 195
 196         bzero(&xdr, sizeof(XDR));
 197
 198         xdrmem_create(&xdr, buf, size, XDR_DECODE);
 199         if (xdr_int(&xdr, &recordmarker) == 0) {
 200                 printf("xdr_int reading recordmarker failed\n");
 201                 xdr_destroy(&xdr);
 202                 return -1;
 203         }
 204         pos = xdr_getpos(&xdr);
 205         if (xdr_int(&xdr, (int *)&xid) == 0) {
 206                 printf("xdr_int reading xid failed\n");
 207                 xdr_destroy(&xdr);
 208                 return -1;
 209         }
 210         xdr_setpos(&xdr, pos);
 211
 212         for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
 213                 if (pdu->xid != xid) {
 214                         continue;
 215                 }
 216                 SLIST_REMOVE(&rpc->waitpdu, pdu);
 217                 if (rpc_process_reply(rpc, pdu, &xdr) != 0) {
 218                         printf("rpc_procdess_reply failed\n");
 219                 }
 220                 xdr_destroy(&xdr);
 221                 rpc_free_pdu(rpc, pdu);
 222                 return 0;
 223         }
 224         printf("No matching pdu found for xid:%d\n", xid);
 225         xdr_destroy(&xdr);
 226         return -1;
 227 }
 228