/* Copyright (C) by Ronnie Sahlberg 2010 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, see . */ #include #include #include #include #include #include "dlinklist.h" #include "nfs.h" #include "libnfs-raw.h" #include "libnfs-private.h" 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) { struct rpc_pdu *pdu; struct rpc_msg msg; if (rpc == NULL) { printf("trying to allocate rpc pdu on NULL context\n"); return NULL; } pdu = malloc(sizeof(struct rpc_pdu)); if (pdu == NULL) { printf("Failed to allocate pdu structure\n"); return NULL; } bzero(pdu, sizeof(struct rpc_pdu)); pdu->xid = rpc->xid++; pdu->cb = cb; pdu->private_data = private_data; pdu->xdr_decode_fn = xdr_decode_fn; pdu->xdr_decode_bufsize = xdr_decode_bufsize; xdrmem_create(&pdu->xdr, rpc->encodebuf, rpc->encodebuflen, XDR_ENCODE); xdr_setpos(&pdu->xdr, 4); /* skip past the record marker */ bzero(&msg, sizeof(struct rpc_msg)); msg.rm_xid = pdu->xid; msg.rm_direction = CALL; msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; msg.rm_call.cb_prog = program; msg.rm_call.cb_vers = version; msg.rm_call.cb_proc = procedure; msg.rm_call.cb_cred = rpc->auth->ah_cred; msg.rm_call.cb_verf = rpc->auth->ah_verf; if (xdr_callmsg(&pdu->xdr, &msg) == 0) { printf("xdr_callmsg failed\n"); xdr_destroy(&pdu->xdr); free(pdu); return NULL; } return pdu; } void rpc_free_pdu(struct rpc_context *rpc UNUSED, struct rpc_pdu *pdu) { if (pdu->outdata.data != NULL) { free(pdu->outdata.data); pdu->outdata.data = NULL; } if (pdu->xdr_decode_buf != NULL) { xdr_free(pdu->xdr_decode_fn, pdu->xdr_decode_buf); free(pdu->xdr_decode_buf); pdu->xdr_decode_buf = NULL; } xdr_destroy(&pdu->xdr); free(pdu); } int rpc_queue_pdu(struct rpc_context *rpc, struct rpc_pdu *pdu) { int size, recordmarker; size = xdr_getpos(&pdu->xdr); /* write recordmarker */ xdr_setpos(&pdu->xdr, 0); recordmarker = (size - 4) | 0x80000000; xdr_int(&pdu->xdr, &recordmarker); pdu->outdata.size = size; pdu->outdata.data = malloc(pdu->outdata.size); if (pdu->outdata.data == NULL) { rpc_set_error(rpc, "Out of memory. Failed to allocate buffer for pdu\n"); rpc_free_pdu(rpc, pdu); return -1; } memcpy(pdu->outdata.data, rpc->encodebuf, pdu->outdata.size); DLIST_ADD_END(rpc->outqueue, pdu, NULL); return 0; } int rpc_get_pdu_size(char *buf) { uint32_t size; size = ntohl(*(uint32_t *)buf); if ((size & 0x80000000) == 0) { printf("cant handle oncrpc fragments\n"); return -1; } return (size & 0x7fffffff) + 4; } static int rpc_process_reply(struct rpc_context *rpc, struct rpc_pdu *pdu, XDR *xdr) { struct rpc_msg msg; bzero(&msg, sizeof(struct rpc_msg)); msg.acpted_rply.ar_verf = _null_auth; if (pdu->xdr_decode_bufsize > 0) { pdu->xdr_decode_buf = malloc(pdu->xdr_decode_bufsize); if (pdu->xdr_decode_buf == NULL) { printf("xdr_replymsg failed in portmap_getport_reply\n"); pdu->cb(rpc, RPC_STATUS_ERROR, "Failed to allocate buffer for decoding of XDR reply", pdu->private_data); return 0; } bzero(pdu->xdr_decode_buf, pdu->xdr_decode_bufsize); } msg.acpted_rply.ar_results.where = pdu->xdr_decode_buf; msg.acpted_rply.ar_results.proc = pdu->xdr_decode_fn; if (xdr_replymsg(xdr, &msg) == 0) { printf("xdr_replymsg failed in portmap_getport_reply\n"); pdu->cb(rpc, RPC_STATUS_ERROR, "Message rejected by server", pdu->private_data); if (pdu->xdr_decode_buf != NULL) { free(pdu->xdr_decode_buf); pdu->xdr_decode_buf = NULL; } return 0; } if (msg.rm_reply.rp_stat != MSG_ACCEPTED) { pdu->cb(rpc, RPC_STATUS_ERROR, "RPC Packet not accepted by the server", pdu->private_data); return 0; } switch (msg.rm_reply.rp_acpt.ar_stat) { case SUCCESS: pdu->cb(rpc, RPC_STATUS_SUCCESS, pdu->xdr_decode_buf, pdu->private_data); break; case PROG_UNAVAIL: pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program not available", pdu->private_data); break; case PROG_MISMATCH: pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program version mismatch", pdu->private_data); break; case PROC_UNAVAIL: pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Procedure not available", pdu->private_data); break; case GARBAGE_ARGS: pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Garbage arguments", pdu->private_data); break; case SYSTEM_ERR: pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: System Error", pdu->private_data); break; default: pdu->cb(rpc, RPC_STATUS_ERROR, "Unknown rpc response from server", pdu->private_data); break; } return 0; } int rpc_process_pdu(struct rpc_context *rpc, char *buf, int size) { struct rpc_pdu *pdu; XDR xdr; int pos, recordmarker; unsigned int xid; bzero(&xdr, sizeof(XDR)); xdrmem_create(&xdr, buf, size, XDR_DECODE); if (xdr_int(&xdr, &recordmarker) == 0) { printf("xdr_int reading recordmarker failed\n"); xdr_destroy(&xdr); return -1; } pos = xdr_getpos(&xdr); if (xdr_int(&xdr, (int *)&xid) == 0) { printf("xdr_int reading xid failed\n"); xdr_destroy(&xdr); return -1; } xdr_setpos(&xdr, pos); for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) { if (pdu->xid != xid) { continue; } DLIST_REMOVE(rpc->waitpdu, pdu); if (rpc_process_reply(rpc, pdu, &xdr) != 0) { printf("rpc_procdess_reply failed\n"); } xdr_destroy(&xdr); rpc_free_pdu(rpc, pdu); return 0; } printf("No matching pdu found for xid:%d\n", xid); xdr_destroy(&xdr); return -1; }