1 /*
2 * linux/net/sunrpc/pmap.c
3 *
4 * Portmapper client.
5 *
6 * FIXME: In a secure environment, we may want to use an authentication
7 * flavor other than AUTH_NULL.
8 *
9 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
10 */
11
12 #include <linux/config.h>
13 #include <linux/types.h>
14 #include <linux/socket.h>
15 #include <linux/kernel.h>
16 #include <linux/errno.h>
17 #include <linux/uio.h>
18 #include <linux/in.h>
19 #include <linux/sunrpc/clnt.h>
20 #include <linux/sunrpc/xprt.h>
21 #include <linux/sunrpc/sched.h>
22
23 #ifdef RPC_DEBUG
24 # define RPCDBG_FACILITY RPCDBG_PMAP
25 #endif
26
27 #define PMAP_SET 1
28 #define PMAP_UNSET 2
29 #define PMAP_GETPORT 3
30
31 static struct rpc_clnt * pmap_create(char *, struct sockaddr_in *, int);
32 static void pmap_getport_done(struct rpc_task *);
33 extern struct rpc_program pmap_program;
34 spinlock_t pmap_lock = SPIN_LOCK_UNLOCKED;
35
36 /*
37 * Obtain the port for a given RPC service on a given host. This one can
38 * be called for an ongoing RPC request.
39 */
40 void
41 rpc_getport(struct rpc_task *task, struct rpc_clnt *clnt)
42 {
43 struct rpc_portmap *map = &clnt->cl_pmap;
44 struct sockaddr_in *sap = &clnt->cl_xprt->addr;
45 struct rpc_message msg = { PMAP_GETPORT, map, &clnt->cl_port, NULL };
46 struct rpc_clnt *pmap_clnt;
47 struct rpc_task *child;
48
49 dprintk("RPC: %4d rpc_getport(%s, %d, %d, %d)\n",
50 task->tk_pid, clnt->cl_server,
51 map->pm_prog, map->pm_vers, map->pm_prot);
52
53 spin_lock(&pmap_lock);
54 if (clnt->cl_binding) {
55 rpc_sleep_on(&clnt->cl_bindwait, task, NULL, 0);
56 spin_unlock(&pmap_lock);
57 return;
58 }
59 clnt->cl_binding = 1;
60 spin_unlock(&pmap_lock);
61
62 task->tk_status = -EACCES; /* why set this? returns -EIO below */
63 if (!(pmap_clnt = pmap_create(clnt->cl_server, sap, map->pm_prot)))
64 goto bailout;
65 task->tk_status = 0;
66
67 /*
68 * Note: rpc_new_child will release client after a failure.
69 */
70 if (!(child = rpc_new_child(pmap_clnt, task)))
71 goto bailout;
72
73 /* Setup the call info struct */
74 rpc_call_setup(child, &msg, 0);
75
76 /* ... and run the child task */
77 rpc_run_child(task, child, pmap_getport_done);
78 return;
79
80 bailout:
81 spin_lock(&pmap_lock);
82 clnt->cl_binding = 0;
83 rpc_wake_up(&clnt->cl_bindwait);
84 spin_unlock(&pmap_lock);
85 task->tk_status = -EIO;
86 task->tk_action = NULL;
87 }
88
89 #ifdef CONFIG_ROOT_NFS
90 char *in_ntoa(__u32 in);
91
92 int
93 rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot)
94 {
95 struct rpc_portmap map = { prog, vers, prot, 0 };
96 struct rpc_clnt *pmap_clnt;
97 char hostname[32];
98 int status;
99
100 dprintk("RPC: rpc_getport_external(%u.%u.%u.%u, %d, %d, %d)\n",
101 NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
102
103 strcpy(hostname, in_ntoa(sin->sin_addr.s_addr));
104 if (!(pmap_clnt = pmap_create(hostname, sin, prot)))
105 return -EACCES;
106
107 /* Setup the call info struct */
108 status = rpc_call(pmap_clnt, PMAP_GETPORT, &map, &map.pm_port, 0);
109
110 if (status >= 0) {
111 if (map.pm_port != 0)
112 return map.pm_port;
113 status = -EACCES;
114 }
115 return status;
116 }
117 #endif
118
119 static void
120 pmap_getport_done(struct rpc_task *task)
121 {
122 struct rpc_clnt *clnt = task->tk_client;
123
124 dprintk("RPC: %4d pmap_getport_done(status %d, port %d)\n",
125 task->tk_pid, task->tk_status, clnt->cl_port);
126 if (task->tk_status < 0) {
127 /* Make the calling task exit with an error */
128 task->tk_action = NULL;
129 } else if (clnt->cl_port == 0) {
130 /* Program not registered */
131 task->tk_status = -EACCES;
132 task->tk_action = NULL;
133 } else {
134 /* byte-swap port number first */
135 clnt->cl_port = htons(clnt->cl_port);
136 clnt->cl_xprt->addr.sin_port = clnt->cl_port;
137 }
138 spin_lock(&pmap_lock);
139 clnt->cl_binding = 0;
140 rpc_wake_up(&clnt->cl_bindwait);
141 spin_unlock(&pmap_lock);
142 }
143
144 /*
145 * Set or unset a port registration with the local portmapper.
146 * port == 0 means unregister, port != 0 means register.
147 */
148 int
149 rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
150 {
151 struct sockaddr_in sin;
152 struct rpc_portmap map;
153 struct rpc_clnt *pmap_clnt;
154 unsigned int error = 0;
155
156 dprintk("RPC: registering (%d, %d, %d, %d) with portmapper.\n",
157 prog, vers, prot, port);
158
159 sin.sin_family = AF_INET;
160 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
161 if (!(pmap_clnt = pmap_create("localhost", &sin, IPPROTO_UDP))) {
162 dprintk("RPC: couldn't create pmap client\n");
163 return -EACCES;
164 }
165
166 map.pm_prog = prog;
167 map.pm_vers = vers;
168 map.pm_prot = prot;
169 map.pm_port = port;
170
171 error = rpc_call(pmap_clnt, port? PMAP_SET : PMAP_UNSET,
172 &map, okay, 0);
173
174 if (error < 0) {
175 printk(KERN_WARNING
176 "RPC: failed to contact portmap (errno %d).\n",
177 error);
178 }
179 dprintk("RPC: registration status %d/%d\n", error, *okay);
180
181 /* Client deleted automatically because cl_oneshot == 1 */
182 return error;
183 }
184
185 static struct rpc_clnt *
186 pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto)
187 {
188 struct rpc_xprt *xprt;
189 struct rpc_clnt *clnt;
190
191 /* printk("pmap: create xprt\n"); */
192 if (!(xprt = xprt_create_proto(proto, srvaddr, NULL)))
193 return NULL;
194 xprt->addr.sin_port = htons(RPC_PMAP_PORT);
195
196 /* printk("pmap: create clnt\n"); */
197 clnt = rpc_create_client(xprt, hostname,
198 &pmap_program, RPC_PMAP_VERSION,
199 RPC_AUTH_NULL);
200 if (!clnt) {
201 xprt_destroy(xprt);
202 } else {
203 clnt->cl_softrtry = 1;
204 clnt->cl_chatty = 1;
205 clnt->cl_oneshot = 1;
206 }
207 return clnt;
208 }
209
210 /*
211 * XDR encode/decode functions for PMAP
212 */
213 static int
214 xdr_error(struct rpc_rqst *req, u32 *p, void *dummy)
215 {
216 return -EIO;
217 }
218
219 static int
220 xdr_encode_mapping(struct rpc_rqst *req, u32 *p, struct rpc_portmap *map)
221 {
222 dprintk("RPC: xdr_encode_mapping(%d, %d, %d, %d)\n",
223 map->pm_prog, map->pm_vers, map->pm_prot, map->pm_port);
224 *p++ = htonl(map->pm_prog);
225 *p++ = htonl(map->pm_vers);
226 *p++ = htonl(map->pm_prot);
227 *p++ = htonl(map->pm_port);
228
229 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
230 return 0;
231 }
232
233 static int
234 xdr_decode_port(struct rpc_rqst *req, u32 *p, unsigned short *portp)
235 {
236 *portp = (unsigned short) ntohl(*p++);
237 return 0;
238 }
239
240 static int
241 xdr_decode_bool(struct rpc_rqst *req, u32 *p, unsigned int *boolp)
242 {
243 *boolp = (unsigned int) ntohl(*p++);
244 return 0;
245 }
246
247 static struct rpc_procinfo pmap_procedures[4] = {
248 { "pmap_null",
249 (kxdrproc_t) xdr_error,
250 (kxdrproc_t) xdr_error, 0, 0 },
251 { "pmap_set",
252 (kxdrproc_t) xdr_encode_mapping,
253 (kxdrproc_t) xdr_decode_bool, 4, 1 },
254 { "pmap_unset",
255 (kxdrproc_t) xdr_encode_mapping,
256 (kxdrproc_t) xdr_decode_bool, 4, 1 },
257 { "pmap_get",
258 (kxdrproc_t) xdr_encode_mapping,
259 (kxdrproc_t) xdr_decode_port, 4, 1 },
260 };
261
262 static struct rpc_version pmap_version2 = {
263 2, 4, pmap_procedures
264 };
265
266 static struct rpc_version * pmap_version[] = {
267 NULL,
268 NULL,
269 &pmap_version2,
270 };
271
272 static struct rpc_stat pmap_stats;
273
274 struct rpc_program pmap_program = {
275 "portmap",
276 RPC_PMAP_PROGRAM,
277 sizeof(pmap_version)/sizeof(pmap_version[0]),
278 pmap_version,
279 &pmap_stats,
280 };
281
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