pmap_clnt.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:7k
- /*
- * linux/net/sunrpc/pmap.c
- *
- * Portmapper client.
- *
- * FIXME: In a secure environment, we may want to use an authentication
- * flavor other than AUTH_NULL.
- *
- * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
- */
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/socket.h>
- #include <linux/kernel.h>
- #include <linux/errno.h>
- #include <linux/uio.h>
- #include <linux/in.h>
- #include <linux/sunrpc/clnt.h>
- #include <linux/sunrpc/xprt.h>
- #include <linux/sunrpc/sched.h>
- #ifdef RPC_DEBUG
- # define RPCDBG_FACILITY RPCDBG_PMAP
- #endif
- #define PMAP_SET 1
- #define PMAP_UNSET 2
- #define PMAP_GETPORT 3
- static struct rpc_clnt * pmap_create(char *, struct sockaddr_in *, int);
- static void pmap_getport_done(struct rpc_task *);
- extern struct rpc_program pmap_program;
- static spinlock_t pmap_lock = SPIN_LOCK_UNLOCKED;
- /*
- * Obtain the port for a given RPC service on a given host. This one can
- * be called for an ongoing RPC request.
- */
- void
- rpc_getport(struct rpc_task *task, struct rpc_clnt *clnt)
- {
- struct rpc_portmap *map = &clnt->cl_pmap;
- struct sockaddr_in *sap = &clnt->cl_xprt->addr;
- struct rpc_message msg = { PMAP_GETPORT, map, &clnt->cl_port, NULL };
- struct rpc_clnt *pmap_clnt;
- struct rpc_task *child;
- dprintk("RPC: %4d rpc_getport(%s, %d, %d, %d)n",
- task->tk_pid, clnt->cl_server,
- map->pm_prog, map->pm_vers, map->pm_prot);
- spin_lock(&pmap_lock);
- if (clnt->cl_binding) {
- rpc_sleep_on(&clnt->cl_bindwait, task, NULL, 0);
- spin_unlock(&pmap_lock);
- return;
- }
- clnt->cl_binding = 1;
- spin_unlock(&pmap_lock);
- task->tk_status = -EACCES; /* why set this? returns -EIO below */
- if (!(pmap_clnt = pmap_create(clnt->cl_server, sap, map->pm_prot)))
- goto bailout;
- task->tk_status = 0;
- /*
- * Note: rpc_new_child will release client after a failure.
- */
- if (!(child = rpc_new_child(pmap_clnt, task)))
- goto bailout;
- /* Setup the call info struct */
- rpc_call_setup(child, &msg, 0);
- /* ... and run the child task */
- rpc_run_child(task, child, pmap_getport_done);
- return;
- bailout:
- spin_lock(&pmap_lock);
- clnt->cl_binding = 0;
- rpc_wake_up(&clnt->cl_bindwait);
- spin_unlock(&pmap_lock);
- task->tk_status = -EIO;
- task->tk_action = NULL;
- }
- #ifdef CONFIG_ROOT_NFS
- char *in_ntoa(__u32 in);
- int
- rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot)
- {
- struct rpc_portmap map = { prog, vers, prot, 0 };
- struct rpc_clnt *pmap_clnt;
- char hostname[32];
- int status;
- dprintk("RPC: rpc_getport_external(%u.%u.%u.%u, %d, %d, %d)n",
- NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
- strcpy(hostname, in_ntoa(sin->sin_addr.s_addr));
- if (!(pmap_clnt = pmap_create(hostname, sin, prot)))
- return -EACCES;
- /* Setup the call info struct */
- status = rpc_call(pmap_clnt, PMAP_GETPORT, &map, &map.pm_port, 0);
- if (status >= 0) {
- if (map.pm_port != 0)
- return map.pm_port;
- status = -EACCES;
- }
- return status;
- }
- #endif
- static void
- pmap_getport_done(struct rpc_task *task)
- {
- struct rpc_clnt *clnt = task->tk_client;
- dprintk("RPC: %4d pmap_getport_done(status %d, port %d)n",
- task->tk_pid, task->tk_status, clnt->cl_port);
- if (task->tk_status < 0) {
- /* Make the calling task exit with an error */
- task->tk_action = NULL;
- } else if (clnt->cl_port == 0) {
- /* Program not registered */
- task->tk_status = -EACCES;
- task->tk_action = NULL;
- } else {
- /* byte-swap port number first */
- clnt->cl_port = htons(clnt->cl_port);
- clnt->cl_xprt->addr.sin_port = clnt->cl_port;
- }
- spin_lock(&pmap_lock);
- clnt->cl_binding = 0;
- rpc_wake_up(&clnt->cl_bindwait);
- spin_unlock(&pmap_lock);
- }
- /*
- * Set or unset a port registration with the local portmapper.
- * port == 0 means unregister, port != 0 means register.
- */
- int
- rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
- {
- struct sockaddr_in sin;
- struct rpc_portmap map;
- struct rpc_clnt *pmap_clnt;
- unsigned int error = 0;
- dprintk("RPC: registering (%d, %d, %d, %d) with portmapper.n",
- prog, vers, prot, port);
- sin.sin_family = AF_INET;
- sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
- if (!(pmap_clnt = pmap_create("localhost", &sin, IPPROTO_UDP))) {
- dprintk("RPC: couldn't create pmap clientn");
- return -EACCES;
- }
- map.pm_prog = prog;
- map.pm_vers = vers;
- map.pm_prot = prot;
- map.pm_port = port;
- error = rpc_call(pmap_clnt, port? PMAP_SET : PMAP_UNSET,
- &map, okay, 0);
- if (error < 0) {
- printk(KERN_WARNING
- "RPC: failed to contact portmap (errno %d).n",
- error);
- }
- dprintk("RPC: registration status %d/%dn", error, *okay);
- /* Client deleted automatically because cl_oneshot == 1 */
- return error;
- }
- static struct rpc_clnt *
- pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto)
- {
- struct rpc_xprt *xprt;
- struct rpc_clnt *clnt;
- /* printk("pmap: create xprtn"); */
- if (!(xprt = xprt_create_proto(proto, srvaddr, NULL)))
- return NULL;
- xprt->addr.sin_port = htons(RPC_PMAP_PORT);
- /* printk("pmap: create clntn"); */
- clnt = rpc_create_client(xprt, hostname,
- &pmap_program, RPC_PMAP_VERSION,
- RPC_AUTH_NULL);
- if (!clnt) {
- xprt_destroy(xprt);
- } else {
- clnt->cl_softrtry = 1;
- clnt->cl_chatty = 1;
- clnt->cl_oneshot = 1;
- }
- return clnt;
- }
- /*
- * XDR encode/decode functions for PMAP
- */
- static int
- xdr_error(struct rpc_rqst *req, u32 *p, void *dummy)
- {
- return -EIO;
- }
- static int
- xdr_encode_mapping(struct rpc_rqst *req, u32 *p, struct rpc_portmap *map)
- {
- dprintk("RPC: xdr_encode_mapping(%d, %d, %d, %d)n",
- map->pm_prog, map->pm_vers, map->pm_prot, map->pm_port);
- *p++ = htonl(map->pm_prog);
- *p++ = htonl(map->pm_vers);
- *p++ = htonl(map->pm_prot);
- *p++ = htonl(map->pm_port);
- req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
- return 0;
- }
- static int
- xdr_decode_port(struct rpc_rqst *req, u32 *p, unsigned short *portp)
- {
- *portp = (unsigned short) ntohl(*p++);
- return 0;
- }
- static int
- xdr_decode_bool(struct rpc_rqst *req, u32 *p, unsigned int *boolp)
- {
- *boolp = (unsigned int) ntohl(*p++);
- return 0;
- }
- static struct rpc_procinfo pmap_procedures[4] = {
- { "pmap_null",
- (kxdrproc_t) xdr_error,
- (kxdrproc_t) xdr_error, 0, 0 },
- { "pmap_set",
- (kxdrproc_t) xdr_encode_mapping,
- (kxdrproc_t) xdr_decode_bool, 4, 1 },
- { "pmap_unset",
- (kxdrproc_t) xdr_encode_mapping,
- (kxdrproc_t) xdr_decode_bool, 4, 1 },
- { "pmap_get",
- (kxdrproc_t) xdr_encode_mapping,
- (kxdrproc_t) xdr_decode_port, 4, 1 },
- };
- static struct rpc_version pmap_version2 = {
- 2, 4, pmap_procedures
- };
- static struct rpc_version * pmap_version[] = {
- NULL,
- NULL,
- &pmap_version2,
- };
- static struct rpc_stat pmap_stats;
- struct rpc_program pmap_program = {
- "portmap",
- RPC_PMAP_PROGRAM,
- sizeof(pmap_version)/sizeof(pmap_version[0]),
- pmap_version,
- &pmap_stats,
- };