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Linux/net/sunrpc/pmap_clnt.c

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  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 static 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 int
 91 rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot)
 92 {
 93         struct rpc_portmap map = { prog, vers, prot, 0 };
 94         struct rpc_clnt *pmap_clnt;
 95         char            hostname[32];
 96         int             status;
 97 
 98         dprintk("RPC:      rpc_getport_external(%u.%u.%u.%u, %d, %d, %d)\n",
 99                         NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
100 
101         sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(sin->sin_addr.s_addr));
102         if (!(pmap_clnt = pmap_create(hostname, sin, prot)))
103                 return -EACCES;
104 
105         /* Setup the call info struct */
106         status = rpc_call(pmap_clnt, PMAP_GETPORT, &map, &map.pm_port, 0);
107 
108         if (status >= 0) {
109                 if (map.pm_port != 0)
110                         return map.pm_port;
111                 status = -EACCES;
112         }
113         return status;
114 }
115 #endif
116 
117 static void
118 pmap_getport_done(struct rpc_task *task)
119 {
120         struct rpc_clnt *clnt = task->tk_client;
121 
122         dprintk("RPC: %4d pmap_getport_done(status %d, port %d)\n",
123                         task->tk_pid, task->tk_status, clnt->cl_port);
124         if (task->tk_status < 0) {
125                 /* Make the calling task exit with an error */
126                 task->tk_action = NULL;
127         } else if (clnt->cl_port == 0) {
128                 /* Program not registered */
129                 task->tk_status = -EACCES;
130                 task->tk_action = NULL;
131         } else {
132                 /* byte-swap port number first */
133                 clnt->cl_port = htons(clnt->cl_port);
134                 clnt->cl_xprt->addr.sin_port = clnt->cl_port;
135         }
136         spin_lock(&pmap_lock);
137         clnt->cl_binding = 0;
138         rpc_wake_up(&clnt->cl_bindwait);
139         spin_unlock(&pmap_lock);
140 }
141 
142 /*
143  * Set or unset a port registration with the local portmapper.
144  * port == 0 means unregister, port != 0 means register.
145  */
146 int
147 rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
148 {
149         struct sockaddr_in      sin;
150         struct rpc_portmap      map;
151         struct rpc_clnt         *pmap_clnt;
152         unsigned int            error = 0;
153 
154         dprintk("RPC: registering (%d, %d, %d, %d) with portmapper.\n",
155                         prog, vers, prot, port);
156 
157         sin.sin_family = AF_INET;
158         sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
159         if (!(pmap_clnt = pmap_create("localhost", &sin, IPPROTO_UDP))) {
160                 dprintk("RPC: couldn't create pmap client\n");
161                 return -EACCES;
162         }
163 
164         map.pm_prog = prog;
165         map.pm_vers = vers;
166         map.pm_prot = prot;
167         map.pm_port = port;
168 
169         error = rpc_call(pmap_clnt, port? PMAP_SET : PMAP_UNSET,
170                                         &map, okay, 0);
171 
172         if (error < 0) {
173                 printk(KERN_WARNING
174                         "RPC: failed to contact portmap (errno %d).\n",
175                         error);
176         }
177         dprintk("RPC: registration status %d/%d\n", error, *okay);
178 
179         /* Client deleted automatically because cl_oneshot == 1 */
180         return error;
181 }
182 
183 static struct rpc_clnt *
184 pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto)
185 {
186         struct rpc_xprt *xprt;
187         struct rpc_clnt *clnt;
188 
189         /* printk("pmap: create xprt\n"); */
190         if (!(xprt = xprt_create_proto(proto, srvaddr, NULL)))
191                 return NULL;
192         xprt->addr.sin_port = htons(RPC_PMAP_PORT);
193 
194         /* printk("pmap: create clnt\n"); */
195         clnt = rpc_create_client(xprt, hostname,
196                                 &pmap_program, RPC_PMAP_VERSION,
197                                 RPC_AUTH_NULL);
198         if (!clnt) {
199                 xprt_destroy(xprt);
200         } else {
201                 clnt->cl_softrtry = 1;
202                 clnt->cl_chatty   = 1;
203                 clnt->cl_oneshot  = 1;
204         }
205         return clnt;
206 }
207 
208 /*
209  * XDR encode/decode functions for PMAP
210  */
211 static int
212 xdr_error(struct rpc_rqst *req, u32 *p, void *dummy)
213 {
214         return -EIO;
215 }
216 
217 static int
218 xdr_encode_mapping(struct rpc_rqst *req, u32 *p, struct rpc_portmap *map)
219 {
220         dprintk("RPC: xdr_encode_mapping(%d, %d, %d, %d)\n",
221                 map->pm_prog, map->pm_vers, map->pm_prot, map->pm_port);
222         *p++ = htonl(map->pm_prog);
223         *p++ = htonl(map->pm_vers);
224         *p++ = htonl(map->pm_prot);
225         *p++ = htonl(map->pm_port);
226 
227         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
228         return 0;
229 }
230 
231 static int
232 xdr_decode_port(struct rpc_rqst *req, u32 *p, unsigned short *portp)
233 {
234         *portp = (unsigned short) ntohl(*p++);
235         return 0;
236 }
237 
238 static int
239 xdr_decode_bool(struct rpc_rqst *req, u32 *p, unsigned int *boolp)
240 {
241         *boolp = (unsigned int) ntohl(*p++);
242         return 0;
243 }
244 
245 static struct rpc_procinfo      pmap_procedures[4] = {
246         { "pmap_null",
247                 (kxdrproc_t) xdr_error, 
248                 (kxdrproc_t) xdr_error, 0, 0 },
249         { "pmap_set",
250                 (kxdrproc_t) xdr_encode_mapping,        
251                 (kxdrproc_t) xdr_decode_bool, 4, 1 },
252         { "pmap_unset",
253                 (kxdrproc_t) xdr_encode_mapping,        
254                 (kxdrproc_t) xdr_decode_bool, 4, 1 },
255         { "pmap_get",
256                 (kxdrproc_t) xdr_encode_mapping,
257                 (kxdrproc_t) xdr_decode_port, 4, 1 },
258 };
259 
260 static struct rpc_version       pmap_version2 = {
261         2, 4, pmap_procedures
262 };
263 
264 static struct rpc_version *     pmap_version[] = {
265         NULL,
266         NULL,
267         &pmap_version2,
268 };
269 
270 static struct rpc_stat          pmap_stats;
271 
272 struct rpc_program      pmap_program = {
273         "portmap",
274         RPC_PMAP_PROGRAM,
275         sizeof(pmap_version)/sizeof(pmap_version[0]),
276         pmap_version,
277         &pmap_stats,
278 };
279 

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