check_type: fix incorrect documentation.
[ccan] / ccan / nfs / pdu.c
1 /*
2    Copyright (C) by Ronnie Sahlberg <ronniesahlberg@gmail.com> 2010
3    
4    This program is free software; you can redistribute it and/or modify
5    it under the terms of the GNU General Public License as published by
6    the Free Software Foundation; either version 3 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 General Public License for more details.
13    
14    You should have received a copy of the GNU 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 <rpc/xdr.h>
21 #include <rpc/rpc_msg.h>
22 #include <ccan/compiler/compiler.h>
23 #include "dlinklist.h"
24 #include "nfs.h"
25 #include "libnfs-raw.h"
26 #include "libnfs-private.h"
27
28 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)
29 {
30         struct rpc_pdu *pdu;
31         struct rpc_msg msg;
32
33         if (rpc == NULL) {
34                 printf("trying to allocate rpc pdu on NULL context\n");
35                 return NULL;
36         }
37
38         pdu = malloc(sizeof(struct rpc_pdu));
39         if (pdu == NULL) {
40                 printf("Failed to allocate pdu structure\n");
41                 return NULL;
42         }
43         bzero(pdu, sizeof(struct rpc_pdu));
44         pdu->xid                = rpc->xid++;
45         pdu->cb                 = cb;
46         pdu->private_data       = private_data;
47         pdu->xdr_decode_fn      = xdr_decode_fn;
48         pdu->xdr_decode_bufsize = xdr_decode_bufsize;
49
50         xdrmem_create(&pdu->xdr, rpc->encodebuf, rpc->encodebuflen, XDR_ENCODE);
51         xdr_setpos(&pdu->xdr, 4); /* skip past the record marker */
52
53         bzero(&msg, sizeof(struct rpc_msg));
54         msg.rm_xid = pdu->xid;
55         msg.rm_direction = CALL;
56         msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
57         msg.rm_call.cb_prog = program;
58         msg.rm_call.cb_vers = version;
59         msg.rm_call.cb_proc = procedure;
60         msg.rm_call.cb_cred = rpc->auth->ah_cred;
61         msg.rm_call.cb_verf = rpc->auth->ah_verf;
62
63         if (xdr_callmsg(&pdu->xdr, &msg) == 0) {
64                 printf("xdr_callmsg failed\n");
65                 xdr_destroy(&pdu->xdr);
66                 free(pdu);
67                 return NULL;
68         }
69
70         return pdu;
71 }
72
73 void rpc_free_pdu(struct rpc_context *rpc UNUSED, struct rpc_pdu *pdu)
74 {
75         if (pdu->outdata.data != NULL) {
76                 free(pdu->outdata.data);
77                 pdu->outdata.data = NULL;
78         }
79
80         if (pdu->xdr_decode_buf != NULL) {
81                 xdr_free(pdu->xdr_decode_fn, pdu->xdr_decode_buf);
82                 free(pdu->xdr_decode_buf);
83                 pdu->xdr_decode_buf = NULL;
84         }
85
86         xdr_destroy(&pdu->xdr);
87         free(pdu);
88 }
89
90
91 int rpc_queue_pdu(struct rpc_context *rpc, struct rpc_pdu *pdu)
92 {
93         int size, recordmarker;
94
95         size = xdr_getpos(&pdu->xdr);
96
97         /* write recordmarker */
98         xdr_setpos(&pdu->xdr, 0);
99         recordmarker = (size - 4) | 0x80000000;
100         xdr_int(&pdu->xdr, &recordmarker);
101
102         pdu->outdata.size = size;
103         pdu->outdata.data = malloc(pdu->outdata.size);
104         if (pdu->outdata.data == NULL) {
105                 rpc_set_error(rpc, "Out of memory. Failed to allocate buffer for pdu\n");
106                 rpc_free_pdu(rpc, pdu);
107                 return -1;
108         }
109
110         memcpy(pdu->outdata.data, rpc->encodebuf, pdu->outdata.size);
111         DLIST_ADD_END(rpc->outqueue, pdu, NULL);
112
113         return 0;
114 }
115
116 int rpc_get_pdu_size(char *buf)
117 {
118         uint32_t size;
119
120         size = ntohl(*(uint32_t *)buf);
121
122         if ((size & 0x80000000) == 0) {
123                 printf("cant handle oncrpc fragments\n");
124                 return -1;
125         }
126
127         return (size & 0x7fffffff) + 4;
128 }
129
130 static int rpc_process_reply(struct rpc_context *rpc, struct rpc_pdu *pdu, XDR *xdr)
131 {
132         struct rpc_msg msg;
133
134         bzero(&msg, sizeof(struct rpc_msg));
135         msg.acpted_rply.ar_verf = _null_auth;
136         if (pdu->xdr_decode_bufsize > 0) {
137                 pdu->xdr_decode_buf = malloc(pdu->xdr_decode_bufsize);
138                 if (pdu->xdr_decode_buf == NULL) {
139                         printf("xdr_replymsg failed in portmap_getport_reply\n");
140                         pdu->cb(rpc, RPC_STATUS_ERROR, "Failed to allocate buffer for decoding of XDR reply", pdu->private_data);
141                         return 0;
142                 }
143                 bzero(pdu->xdr_decode_buf, pdu->xdr_decode_bufsize);
144         }
145         msg.acpted_rply.ar_results.where = pdu->xdr_decode_buf;
146         msg.acpted_rply.ar_results.proc  = pdu->xdr_decode_fn;
147
148         if (xdr_replymsg(xdr, &msg) == 0) {
149                 printf("xdr_replymsg failed in portmap_getport_reply\n");
150                 pdu->cb(rpc, RPC_STATUS_ERROR, "Message rejected by server", pdu->private_data);
151                 if (pdu->xdr_decode_buf != NULL) {
152                         free(pdu->xdr_decode_buf);
153                         pdu->xdr_decode_buf = NULL;
154                 }
155                 return 0;
156         }
157         if (msg.rm_reply.rp_stat != MSG_ACCEPTED) {
158                 pdu->cb(rpc, RPC_STATUS_ERROR, "RPC Packet not accepted by the server", pdu->private_data);
159                 return 0;
160         }
161         switch (msg.rm_reply.rp_acpt.ar_stat) {
162         case SUCCESS:
163                 pdu->cb(rpc, RPC_STATUS_SUCCESS, pdu->xdr_decode_buf, pdu->private_data);
164                 break;
165         case PROG_UNAVAIL:
166                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program not available", pdu->private_data);
167                 break;
168         case PROG_MISMATCH:
169                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Program version mismatch", pdu->private_data);
170                 break;
171         case PROC_UNAVAIL:
172                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Procedure not available", pdu->private_data);
173                 break;
174         case GARBAGE_ARGS:
175                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: Garbage arguments", pdu->private_data);
176                 break;
177         case SYSTEM_ERR:
178                 pdu->cb(rpc, RPC_STATUS_ERROR, "Server responded: System Error", pdu->private_data);
179                 break;
180         default:
181                 pdu->cb(rpc, RPC_STATUS_ERROR, "Unknown rpc response from server", pdu->private_data);
182                 break;
183         }
184
185         return 0;
186 }
187
188 int rpc_process_pdu(struct rpc_context *rpc, char *buf, int size)
189 {
190         struct rpc_pdu *pdu;
191         XDR xdr;
192         int pos, recordmarker;
193         unsigned int xid;
194
195         bzero(&xdr, sizeof(XDR));
196
197         xdrmem_create(&xdr, buf, size, XDR_DECODE);
198         if (xdr_int(&xdr, &recordmarker) == 0) {
199                 printf("xdr_int reading recordmarker failed\n");
200                 xdr_destroy(&xdr);
201                 return -1;
202         }
203         pos = xdr_getpos(&xdr);
204         if (xdr_int(&xdr, (int *)&xid) == 0) {
205                 printf("xdr_int reading xid failed\n");
206                 xdr_destroy(&xdr);
207                 return -1;
208         }
209         xdr_setpos(&xdr, pos);
210
211         for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
212                 if (pdu->xid != xid) {
213                         continue;
214                 }
215                 DLIST_REMOVE(rpc->waitpdu, pdu);
216                 if (rpc_process_reply(rpc, pdu, &xdr) != 0) {
217                         printf("rpc_procdess_reply failed\n");
218                 }
219                 xdr_destroy(&xdr);
220                 rpc_free_pdu(rpc, pdu);
221                 return 0;
222         }
223         printf("No matching pdu found for xid:%d\n", xid);
224         xdr_destroy(&xdr);
225         return -1;
226 }
227