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/*
* Provide a variety of APIs that query an rpcbind daemon to
* discover RPC service ports and allowed protocol version
* numbers.
*
* Copyright (C) 2008 Oracle Corporation. All rights reserved.
*
* 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 2 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, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 0211-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>
#ifdef HAVE_LIBTIRPC
#include <netconfig.h>
#include <rpc/rpcb_prot.h>
#endif
#include "sockaddr.h"
#include "nfsrpc.h"
#include "nfslib.h"
/*
* Try a local socket first to access the local rpcbind daemon
*
* Rpcbind's local socket service does not seem to be working.
* Disable this logic for now.
*/
#ifdef HAVE_LIBTIRPC
#undef NFS_GP_LOCAL
#else /* !HAVE_LIBTIRPC */
#undef NFS_GP_LOCAL
#endif /* !HAVE_LIBTIRPC */
#ifdef HAVE_LIBTIRPC
static const rpcvers_t default_rpcb_version = RPCBVERS_4;
#else /* !HAVE_LIBTIRPC */
static const rpcvers_t default_rpcb_version = PMAPVERS;
#endif /* !HAVE_LIBTIRPC */
/*
* Historical: Map TCP connect timeouts to timeout
* error code used by UDP.
*/
static void
nfs_gp_map_tcp_errorcodes(const unsigned short protocol)
{
if (protocol != IPPROTO_TCP)
return;
switch (rpc_createerr.cf_error.re_errno) {
case ETIMEDOUT:
rpc_createerr.cf_stat = RPC_TIMEDOUT;
break;
case ECONNREFUSED:
rpc_createerr.cf_stat = RPC_CANTRECV;
break;
}
}
/*
* There's no easy way to tell how the local system's networking
* and rpcbind is configured (ie. whether we want to use IPv6 or
* IPv4 loopback to contact RPC services on the local host). We
* punt and simply try to look up "localhost".
*
* Returns TRUE on success.
*/
static int nfs_gp_loopback_address(struct sockaddr *sap, socklen_t *salen)
{
struct addrinfo *gai_results;
int ret = 0;
if (getaddrinfo("localhost", NULL, NULL, &gai_results))
return 0;
if (*salen >= gai_results->ai_addrlen) {
memcpy(sap, gai_results->ai_addr,
gai_results->ai_addrlen);
*salen = gai_results->ai_addrlen;
ret = 1;
}
nfs_freeaddrinfo(gai_results);
return ret;
}
/*
* Look up a network service in /etc/services and return the
* network-order port number of that service.
*/
static in_port_t nfs_gp_getservbyname(const char *service,
const unsigned short protocol)
{
const struct addrinfo gai_hint = {
.ai_family = AF_INET,
.ai_protocol = protocol,
.ai_flags = AI_PASSIVE,
};
struct addrinfo *gai_results;
const struct sockaddr_in *sin;
in_port_t port;
if (getaddrinfo(NULL, service, &gai_hint, &gai_results) != 0)
return 0;
sin = (const struct sockaddr_in *)gai_results->ai_addr;
port = sin->sin_port;
nfs_freeaddrinfo(gai_results);
return port;
}
/*
* Discover the port number that should be used to contact an
* rpcbind service. This will detect if the port has a local
* value that may have been set in /etc/services.
*
* Returns network byte-order port number of rpcbind service
* on this system.
*/
static in_port_t nfs_gp_get_rpcb_port(const unsigned short protocol)
{
static const char *rpcb_netnametbl[] = {
"rpcbind",
"portmapper",
"sunrpc",
NULL,
};
unsigned int i;
for (i = 0; rpcb_netnametbl[i] != NULL; i++) {
in_port_t port;
port = nfs_gp_getservbyname(rpcb_netnametbl[i], protocol);
if (port != 0)
return port;
}
return (in_port_t)htons((uint16_t)PMAPPORT);
}
/*
* Set up an RPC client for communicating with an rpcbind daemon at
* @sap over @transport with protocol version @version.
*
* Returns a pointer to a prepared RPC client if successful, and
* @timeout is initialized; caller must destroy a non-NULL returned RPC
* client. Otherwise returns NULL, and rpc_createerr.cf_stat is set to
* reflect the error.
*/
static CLIENT *nfs_gp_get_rpcbclient(struct sockaddr *sap,
const socklen_t salen,
const unsigned short transport,
const rpcvers_t version,
struct timeval *timeout)
{
static const char *rpcb_pgmtbl[] = {
"rpcbind",
"portmap",
"portmapper",
"sunrpc",
NULL,
};
rpcprog_t rpcb_prog = nfs_getrpcbyname(RPCBPROG, rpcb_pgmtbl);
CLIENT *clnt;
nfs_set_port(sap, ntohs(nfs_gp_get_rpcb_port(transport)));
clnt = nfs_get_rpcclient(sap, salen, transport, rpcb_prog,
version, timeout);
nfs_gp_map_tcp_errorcodes(transport);
return clnt;
}
/**
* nfs_get_proto - Convert a netid to an address family and protocol number
* @netid: C string containing a netid
* @family: OUT: address family
* @protocol: OUT: protocol number
*
* Returns 1 and fills in @protocol if the netid was recognized;
* otherwise zero is returned.
*/
#ifdef HAVE_LIBTIRPC
int
nfs_get_proto(const char *netid, sa_family_t *family, unsigned long *protocol)
{
struct netconfig *nconf;
struct protoent *proto;
/*
* IANA does not define a protocol number for rdma netids,
* since "rdma" is not an IP protocol.
*/
if (strcmp(netid, "rdma") == 0) {
*family = AF_INET;
*protocol = NFSPROTO_RDMA;
return 1;
}
if (strcmp(netid, "rdma6") == 0) {
*family = AF_INET6;
*protocol = NFSPROTO_RDMA;
return 1;
}
nconf = getnetconfigent(netid);
if (nconf == NULL)
return 0;
proto = getprotobyname(nconf->nc_proto);
if (proto == NULL) {
freenetconfigent(nconf);
return 0;
}
*family = AF_UNSPEC;
if (strcmp(nconf->nc_protofmly, NC_INET) == 0)
*family = AF_INET;
if (strcmp(nconf->nc_protofmly, NC_INET6) == 0)
*family = AF_INET6;
freenetconfigent(nconf);
*protocol = (unsigned long)proto->p_proto;
return 1;
}
#else /* !HAVE_LIBTIRPC */
int
nfs_get_proto(const char *netid, sa_family_t *family, unsigned long *protocol)
{
struct protoent *proto;
/*
* IANA does not define a protocol number for rdma netids,
* since "rdma" is not an IP protocol.
*/
if (strcmp(netid, "rdma") == 0) {
*family = AF_INET;
*protocol = NFSPROTO_RDMA;
return 1;
}
proto = getprotobyname(netid);
if (proto == NULL)
return 0;
*family = AF_INET;
*protocol = (unsigned long)proto->p_proto;
return 1;
}
#endif /* !HAVE_LIBTIRPC */
/**
* nfs_get_netid - Convert a protocol family and protocol name to a netid
* @family: protocol family
* @protocol: protocol number
*
* One of the arguments passed when querying remote rpcbind services
* via rpcbind v3 or v4 is a netid string. This replaces the pm_prot
* field used in legacy PMAP_GETPORT calls.
*
* RFC 1833 says netids are not standard but rather defined on the local
* host. There are, however, standard definitions for nc_protofmly and
* nc_proto that can be used to derive a netid string on the local host,
* based on the contents of /etc/netconfig.
*
* Walk through the local netconfig database and grab the netid of the
* first entry that matches @family and @protocol and whose netid string
* fits in the provided buffer.
*
* Returns a '\0'-terminated string if successful. Caller must
* free the returned string. Otherwise NULL is returned, and
* rpc_createerr.cf_stat is set to reflect the error.
*/
#ifdef HAVE_LIBTIRPC
char *nfs_get_netid(const sa_family_t family, const unsigned long protocol)
{
char *nc_protofmly, *nc_proto, *nc_netid;
struct netconfig *nconf;
struct protoent *proto;
void *handle;
switch (family) {
case AF_LOCAL:
case AF_INET:
nc_protofmly = NC_INET;
break;
case AF_INET6:
nc_protofmly = NC_INET6;
break;
default:
goto out;
}
proto = getprotobynumber(protocol);
if (proto == NULL)
goto out;
nc_proto = proto->p_name;
handle = setnetconfig();
while ((nconf = getnetconfig(handle)) != NULL) {
if (nconf->nc_protofmly != NULL &&
strcmp(nconf->nc_protofmly, nc_protofmly) != 0)
continue;
if (nconf->nc_proto != NULL &&
strcmp(nconf->nc_proto, nc_proto) != 0)
continue;
nc_netid = strdup(nconf->nc_netid);
endnetconfig(handle);
if (nc_netid == NULL)
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
return nc_netid;
}
endnetconfig(handle);
out:
rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
return NULL;
}
#else /* !HAVE_LIBTIRPC */
char *nfs_get_netid(const sa_family_t family, const unsigned long protocol)
{
struct protoent *proto;
char *netid;
if (family != AF_INET)
goto out;
proto = getprotobynumber((int)protocol);
if (proto == NULL)
goto out;
netid = strdup(proto->p_name);
if (netid == NULL)
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
return netid;
out:
rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
return NULL;
}
#endif /* !HAVE_LIBTIRPC */
/*
* Extract a port number from a universal address, and terminate the
* string in @addrstr just after the address part.
*
* Returns -1 if unsuccesful; otherwise a decoded port number (possibly 0)
* is returned.
*/
static int nfs_gp_universal_porthelper(char *addrstr)
{
char *p, *endptr;
unsigned long portlo, porthi;
int port = -1;
p = strrchr(addrstr, '.');
if (p == NULL)
goto out;
portlo = strtoul(p + 1, &endptr, 10);
if (*endptr != '\0' || portlo > 255)
goto out;
*p = '\0';
p = strrchr(addrstr, '.');
if (p == NULL)
goto out;
porthi = strtoul(p + 1, &endptr, 10);
if (*endptr != '\0' || porthi > 255)
goto out;
*p = '\0';
port = (porthi << 8) | portlo;
out:
return port;
}
/**
* nfs_universal2port - extract port number from a "universal address"
* @uaddr: '\0'-terminated C string containing a universal address
*
* Universal addresses (defined in RFC 1833) are used when calling an
* rpcbind daemon via protocol versions 3 or 4..
*
* Returns -1 if unsuccesful; otherwise a decoded port number (possibly 0)
* is returned.
*/
int nfs_universal2port(const char *uaddr)
{
char *addrstr;
int port = -1;
addrstr = strdup(uaddr);
if (addrstr != NULL) {
port = nfs_gp_universal_porthelper(addrstr);
free(addrstr);
}
return port;
}
/**
* nfs_sockaddr2universal - convert a sockaddr to a "universal address"
* @sap: pointer to a socket address
*
* Universal addresses (defined in RFC 1833) are used when calling an
* rpcbind daemon via protocol versions 3 or 4..
*
* Returns a '\0'-terminated string if successful; caller must free
* the returned string. Otherwise NULL is returned and
* rpc_createerr.cf_stat is set to reflect the error.
*
* inet_ntop(3) is used here, since getnameinfo(3) is not available
* in some earlier glibc releases, and we don't require support for
* scope IDs for universal addresses.
*/
char *nfs_sockaddr2universal(const struct sockaddr *sap)
{
const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
const struct sockaddr_un *sun = (const struct sockaddr_un *)sap;
const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
char buf[INET6_ADDRSTRLEN + 8 /* for port information */];
uint16_t port;
size_t count;
char *result;
int len;
switch (sap->sa_family) {
case AF_LOCAL:
return strndup(sun->sun_path, sizeof(sun->sun_path));
case AF_INET:
if (inet_ntop(AF_INET, (const void *)&sin->sin_addr.s_addr,
buf, (socklen_t)sizeof(buf)) == NULL)
goto out_err;
port = ntohs(sin->sin_port);
break;
case AF_INET6:
if (inet_ntop(AF_INET6, (const void *)&sin6->sin6_addr,
buf, (socklen_t)sizeof(buf)) == NULL)
goto out_err;
port = ntohs(sin6->sin6_port);
break;
default:
goto out_err;
}
count = sizeof(buf) - strlen(buf);
len = snprintf(buf + strlen(buf), count, ".%u.%u",
(unsigned)(port >> 8), (unsigned)(port & 0xff));
/* before glibc 2.0.6, snprintf(3) could return -1 */
if (len < 0 || (size_t)len > count)
goto out_err;
result = strdup(buf);
if (result != NULL)
return result;
out_err:
rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
return NULL;
}
/*
* Send a NULL request to the indicated RPC service.
*
* Returns 1 if the service responded; otherwise 0;
*/
static int nfs_gp_ping(CLIENT *client, struct timeval timeout)
{
enum clnt_stat status;
status = CLNT_CALL(client, NULLPROC,
(xdrproc_t)xdr_void, NULL,
(xdrproc_t)xdr_void, NULL,
timeout);
if (status != RPC_SUCCESS) {
rpc_createerr.cf_stat = status;
CLNT_GETERR(client, &rpc_createerr.cf_error);
}
return (int)(status == RPC_SUCCESS);
}
#ifdef HAVE_LIBTIRPC
/*
* Initialize the rpcb argument for a GETADDR request.
*
* Returns 1 if successful, and caller must free strings pointed
* to by r_netid and r_addr; otherwise 0.
*/
static int nfs_gp_init_rpcb_parms(const struct sockaddr *sap,
const rpcprog_t program,
const rpcvers_t version,
const unsigned short protocol,
struct rpcb *parms)
{
char *netid, *addr;
netid = nfs_get_netid(sap->sa_family, protocol);
if (netid == NULL)
return 0;
addr = nfs_sockaddr2universal(sap);
if (addr == NULL) {
free(netid);
return 0;
}
memset(parms, 0, sizeof(*parms));
parms->r_prog = program;
parms->r_vers = version;
parms->r_netid = netid;
parms->r_addr = addr;
parms->r_owner = "";
return 1;
}
static void nfs_gp_free_rpcb_parms(struct rpcb *parms)
{
free(parms->r_netid);
free(parms->r_addr);
}
/*
* Try rpcbind GETADDR via version 4. If that fails, try same
* request via version 3.
*
* Returns non-zero port number on success; otherwise returns
* zero. rpccreateerr is set to reflect the nature of the error.
*/
static unsigned short nfs_gp_rpcb_getaddr(CLIENT *client,
struct rpcb *parms,
struct timeval timeout)
{
rpcvers_t rpcb_version;
struct rpc_err rpcerr;
int port = 0;
for (rpcb_version = RPCBVERS_4;
rpcb_version >= RPCBVERS_3;
rpcb_version--) {
enum clnt_stat status;
char *uaddr = NULL;
CLNT_CONTROL(client, CLSET_VERS, (void *)&rpcb_version);
status = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR,
(xdrproc_t)xdr_rpcb, (void *)parms,
(xdrproc_t)xdr_wrapstring, (void *)&uaddr,
timeout);
switch (status) {
case RPC_SUCCESS:
if ((uaddr == NULL) || (uaddr[0] == '\0')) {
rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
return 0;
}
port = nfs_universal2port(uaddr);
xdr_free((xdrproc_t)xdr_wrapstring, (char *)&uaddr);
if (port == -1) {
rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
return 0;
}
return (unsigned short)port;
case RPC_PROGVERSMISMATCH:
clnt_geterr(client, &rpcerr);
if (rpcerr.re_vers.low > RPCBVERS4)
return 0;
continue;
case RPC_PROCUNAVAIL:
case RPC_PROGUNAVAIL:
continue;
default:
/* Most likely RPC_TIMEDOUT or RPC_CANTRECV */
rpc_createerr.cf_stat = status;
clnt_geterr(client, &rpc_createerr.cf_error);
return 0;
}
}
if (port == 0) {
rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
clnt_geterr(client, &rpc_createerr.cf_error);
}
return port;
}
#endif /* HAVE_LIBTIRPC */
/*
* Try GETPORT request via rpcbind version 2.
*
* Returns non-zero port number on success; otherwise returns
* zero. rpccreateerr is set to reflect the nature of the error.
*/
static unsigned long nfs_gp_pmap_getport(CLIENT *client,
struct pmap *parms,
struct timeval timeout)
{
enum clnt_stat status;
unsigned long port;
status = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT,
(xdrproc_t)xdr_pmap, (void *)parms,
(xdrproc_t)xdr_u_long, (void *)&port,
timeout);
if (status != RPC_SUCCESS) {
rpc_createerr.cf_stat = status;
CLNT_GETERR(client, &rpc_createerr.cf_error);
port = 0;
} else if (port == 0)
rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
return port;
}
#ifdef HAVE_LIBTIRPC
static unsigned short nfs_gp_getport_rpcb(CLIENT *client,
const struct sockaddr *sap,
const rpcprog_t program,
const rpcvers_t version,
const unsigned short protocol,
struct timeval timeout)
{
unsigned short port = 0;
struct rpcb parms;
if (nfs_gp_init_rpcb_parms(sap, program, version,
protocol, &parms) != 0) {
port = nfs_gp_rpcb_getaddr(client, &parms, timeout);
nfs_gp_free_rpcb_parms(&parms);
}
return port;
}
#endif /* HAVE_LIBTIRPC */
static unsigned long nfs_gp_getport_pmap(CLIENT *client,
const rpcprog_t program,
const rpcvers_t version,
const unsigned short protocol,
struct timeval timeout)
{
struct pmap parms = {
.pm_prog = program,
.pm_vers = version,
.pm_prot = protocol,
};
rpcvers_t pmap_version = PMAPVERS;
CLNT_CONTROL(client, CLSET_VERS, (void *)&pmap_version);
return nfs_gp_pmap_getport(client, &parms, timeout);
}
/*
* Try an AF_INET6 request via rpcbind v4/v3; try an AF_INET
* request via rpcbind v2.
*
* Returns non-zero port number on success; otherwise returns
* zero. rpccreateerr is set to reflect the nature of the error.
*/
static unsigned short nfs_gp_getport(CLIENT *client,
const struct sockaddr *sap,
const rpcprog_t program,
const rpcvers_t version,
const unsigned short protocol,
struct timeval timeout)
{
switch (sap->sa_family) {
#ifdef HAVE_LIBTIRPC
case AF_INET6:
return nfs_gp_getport_rpcb(client, sap, program,
version, protocol, timeout);
#endif /* HAVE_LIBTIRPC */
case AF_INET:
return nfs_gp_getport_pmap(client, program, version,
protocol, timeout);
}
rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
return 0;
}
/**
* nfs_rpc_ping - Determine if RPC service is responding to requests
* @sap: pointer to address of server to query (port is already filled in)
* @salen: length of server address
* @program: requested RPC program number
* @version: requested RPC version number
* @protocol: requested IPPROTO_ value of transport protocol
* @timeout: pointer to request timeout (NULL means use default timeout)
*
* Returns 1 if the remote service responded without an error; otherwise
* zero.
*/
int nfs_rpc_ping(const struct sockaddr *sap, const socklen_t salen,
const rpcprog_t program, const rpcvers_t version,
const unsigned short protocol, const struct timeval *timeout)
{
union nfs_sockaddr address;
struct sockaddr *saddr = &address.sa;
CLIENT *client;
struct timeval tout = { -1, 0 };
int result = 0;
if (timeout != NULL)
tout = *timeout;
nfs_clear_rpc_createerr();
memcpy(saddr, sap, (size_t)salen);
client = nfs_get_rpcclient(saddr, salen, protocol,
program, version, &tout);
if (client != NULL) {
result = nfs_gp_ping(client, tout);
nfs_gp_map_tcp_errorcodes(protocol);
CLNT_DESTROY(client);
}
return result;
}
/**
* nfs_getport - query server's rpcbind to get port number for an RPC service
* @sap: pointer to address of server to query
* @salen: length of server's address
* @program: requested RPC program number
* @version: requested RPC version number
* @protocol: IPPROTO_ value of requested transport protocol
*
* Uses any acceptable rpcbind version to discover the port number for the
* RPC service described by the given [program, version, transport] tuple.
* Uses a quick timeout and an ephemeral source port. Supports AF_INET and
* AF_INET6 server addresses.
*
* Returns a positive integer representing the port number of the RPC
* service advertised by the server (in host byte order), or zero if the
* service is not advertised or there was some problem querying the server's
* rpcbind daemon. rpccreateerr is set to reflect the underlying cause of
* the error.
*
* There are a variety of ways to choose which transport and rpcbind versions
* to use. We chose to conserve local resources and try to avoid incurring
* timeouts.
*
* Transport
* To provide rudimentary support for traversing firewalls, query the remote
* using the same transport as the requested service. This provides some
* guarantee that the requested transport is available between this client
* and the server, and if the caller specifically requests TCP, for example,
* this may be becuase a firewall is in place that blocks UDP traffic. We
* could try both, but that could involve a lengthy timeout in several cases,
* and would often consume an extra ephemeral port.
*
* Rpcbind version
* To avoid using up too many ephemeral ports, AF_INET queries use tried-and-
* true rpcbindv2, and don't try the newer versions; and AF_INET6 queries use
* rpcbindv4, then rpcbindv3 on the same socket. The newer rpcbind protocol
* versions can adequately detect if a remote RPC service does not support
* AF_INET6 at all. The rpcbind socket is re-used in an attempt to keep the
* overall number of consumed ephemeral ports low.
*/
unsigned short nfs_getport(const struct sockaddr *sap,
const socklen_t salen,
const rpcprog_t program,
const rpcvers_t version,
const unsigned short protocol)
{
union nfs_sockaddr address;
struct sockaddr *saddr = &address.sa;
struct timeval timeout = { -1, 0 };
unsigned short port = 0;
CLIENT *client;
nfs_clear_rpc_createerr();
memcpy(saddr, sap, (size_t)salen);
client = nfs_gp_get_rpcbclient(saddr, salen, protocol,
default_rpcb_version, &timeout);
if (client != NULL) {
port = nfs_gp_getport(client, saddr, program,
version, protocol, timeout);
CLNT_DESTROY(client);
}
return port;
}
/**
* nfs_getport_ping - query server's rpcbind and do RPC ping to verify result
* @sap: IN: pointer to address of server to query;
* OUT: pointer to updated address
* @salen: length of server's address
* @program: requested RPC program number
* @version: requested RPC version number
* @protocol: IPPROTO_ value of requested transport protocol
*
* Uses any acceptable rpcbind version to discover the port number for the
* RPC service described by the given [program, version, transport] tuple.
* Uses a quick timeout and an ephemeral source port. Supports AF_INET and
* AF_INET6 server addresses.
*
* Returns a 1 and sets the port number in the passed-in server address
* if both the query and the ping were successful; otherwise zero.
* rpccreateerr is set to reflect the underlying cause of the error.
*/
int nfs_getport_ping(struct sockaddr *sap, const socklen_t salen,
const rpcprog_t program, const rpcvers_t version,
const unsigned short protocol)
{
struct timeval timeout = { -1, 0 };
unsigned short port = 0;
CLIENT *client;
int result = 0;
nfs_clear_rpc_createerr();
client = nfs_gp_get_rpcbclient(sap, salen, protocol,
default_rpcb_version, &timeout);
if (client != NULL) {
port = nfs_gp_getport(client, sap, program,
version, protocol, timeout);
CLNT_DESTROY(client);
client = NULL;
}
if (port != 0) {
union nfs_sockaddr address;
struct sockaddr *saddr = &address.sa;
memcpy(saddr, sap, (size_t)salen);
nfs_set_port(saddr, port);
nfs_clear_rpc_createerr();
client = nfs_get_rpcclient(saddr, salen, protocol,
program, version, &timeout);
if (client != NULL) {
result = nfs_gp_ping(client, timeout);
nfs_gp_map_tcp_errorcodes(protocol);
CLNT_DESTROY(client);
}
}
if (result)
nfs_set_port(sap, port);
return result;
}
/**
* nfs_getlocalport - query local rpcbind to get port number for an RPC service
* @program: requested RPC program number
* @version: requested RPC version number
* @protocol: IPPROTO_ value of requested transport protocol
*
* Uses any acceptable rpcbind version to discover the port number for the
* RPC service described by the given [program, version, transport] tuple.
* Uses a quick timeout and an ephemeral source port. Supports AF_INET and
* AF_INET6 local addresses.
*
* Returns a positive integer representing the port number of the RPC
* service advertised by the server (in host byte order), or zero if the
* service is not advertised or there was some problem querying the server's
* rpcbind daemon. rpccreateerr is set to reflect the underlying cause of
* the error.
*
* Try an AF_LOCAL connection first. The rpcbind daemon implementation should
* listen on AF_LOCAL.
*
* If that doesn't work (for example, if portmapper is running, or rpcbind
* isn't listening on /run/rpcbind.sock), send a query via UDP to localhost
* (UDP doesn't leave a socket in TIME_WAIT, and the timeout is a relatively
* short 3 seconds).
*/
unsigned short nfs_getlocalport(const rpcprot_t program,
const rpcvers_t version,
const unsigned short protocol)
{
union nfs_sockaddr address;
struct sockaddr *lb_addr = &address.sa;
socklen_t lb_len = sizeof(*lb_addr);
unsigned short port = 0;
#ifdef NFS_GP_LOCAL
const struct sockaddr_un sun = {
.sun_family = AF_LOCAL,
.sun_path = _PATH_RPCBINDSOCK,
};
const struct sockaddr *sap = (struct sockaddr *)&sun;
const socklen_t salen = SUN_LEN(&sun);
CLIENT *client;
struct timeval timeout = { -1, 0 };
nfs_clear_rpc_createerr();
client = nfs_gp_get_rpcbclient(sap, salen, 0, RPCBVERS_4, &timeout);
if (client != NULL) {
struct rpcb parms;
if (nfs_gp_init_rpcb_parms(sap, program, version,
protocol, &parms) != 0) {
port = nfs_gp_rpcb_getaddr(client, &parms, timeout);
nfs_gp_free_rpcb_parms(&parms);
}
CLNT_DESTROY(client);
}
#endif /* NFS_GP_LOCAL */
if (port == 0) {
nfs_clear_rpc_createerr();
if (nfs_gp_loopback_address(lb_addr, &lb_len)) {
port = nfs_getport(lb_addr, lb_len,
program, version, protocol);
} else
rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
}
return port;
}
/**
* nfs_rpcb_getaddr - query rpcbind via rpcbind versions 4 and 3
* @sap: pointer to address of server to query
* @salen: length of server address
* @transport: transport protocol to use for the query
* @addr: pointer to r_addr address
* @program: requested RPC program number
* @version: requested RPC version number
* @protocol: requested IPPROTO_ value of transport protocol
* @timeout: pointer to request timeout (NULL means use default timeout)
*
* Returns a positive integer representing the port number of the RPC
* service advertised by the server (in host byte order), or zero if the
* service is not advertised or there was some problem querying the
* server's rpcbind daemon. rpccreateerr is set to reflect the
* underlying cause of the error.
*
* This function provides similar functionality to nfs_pmap_getport(),
* but performs the rpcbind lookup via rpcbind version 4. If the server
* doesn't support rpcbind version 4, it will retry with version 3.
* The GETADDR procedure is exactly the same in these two versions of
* the rpcbind protocol, so the socket, RPC client, and arguments are
* re-used when retrying, saving ephemeral port space.
*
* These RPC procedures take a universal address as an argument, so the
* query will fail if the remote rpcbind daemon doesn't find an entry
* with a matching address. A matching address includes an ANYADDR
* address of the same address family. In this way an RPC server can
* advertise via rpcbind that it does not support AF_INET6.
*/
#ifdef HAVE_LIBTIRPC
unsigned short nfs_rpcb_getaddr(const struct sockaddr *sap,
const socklen_t salen,
const unsigned short transport,
const struct sockaddr *addr,
const rpcprog_t program,
const rpcvers_t version,
const unsigned short protocol,
const struct timeval *timeout)
{
union nfs_sockaddr address;
struct sockaddr *saddr = &address.sa;
CLIENT *client;
struct rpcb parms;
struct timeval tout = { -1, 0 };
unsigned short port = 0;
if (timeout != NULL)
tout = *timeout;
nfs_clear_rpc_createerr();
memcpy(saddr, sap, (size_t)salen);
client = nfs_gp_get_rpcbclient(saddr, salen, transport,
RPCBVERS_4, &tout);
if (client != NULL) {
if (nfs_gp_init_rpcb_parms(addr, program, version,
protocol, &parms) != 0) {
port = nfs_gp_rpcb_getaddr(client, &parms, tout);
nfs_gp_free_rpcb_parms(&parms);
}
CLNT_DESTROY(client);
}
return port;
}
#else /* !HAVE_LIBTIRPC */
unsigned short nfs_rpcb_getaddr(__attribute__((unused)) const struct sockaddr *sap,
__attribute__((unused)) const socklen_t salen,
__attribute__((unused)) const unsigned short transport,
__attribute__((unused)) const struct sockaddr *addr,
__attribute__((unused)) const rpcprog_t program,
__attribute__((unused)) const rpcvers_t version,
__attribute__((unused)) const unsigned short protocol,
__attribute__((unused)) const struct timeval *timeout)
{
nfs_clear_rpc_createerr();
rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
return 0;
}
#endif /* !HAVE_LIBTIRPC */
/**
* nfs_pmap_getport - query rpcbind via the portmap protocol (rpcbindv2)
* @sin: pointer to AF_INET address of server to query
* @transport: transport protocol to use for the query
* @program: requested RPC program number
* @version: requested RPC version number
* @protocol: requested IPPROTO_ value of transport protocol
* @timeout: pointer to request timeout (NULL means use default timeout)
*
* Returns a positive integer representing the port number of the RPC service
* advertised by the server (in host byte order), or zero if the service is
* not advertised or there was some problem querying the server's rpcbind
* daemon. rpccreateerr is set to reflect the underlying cause of the error.
*
* nfs_pmap_getport() is very similar to pmap_getport(), except that:
*
* 1. This version always tries to use an ephemeral port, since reserved
* ports are not needed for GETPORT queries. This conserves the very
* limited reserved port space, helping reduce failed socket binds
* during mount storms.
*
* 2. This version times out quickly by default. It time-limits the
* connect process as well as the actual RPC call, and even allows the
* caller to specify the timeout.
*
* 3. This version shares code with the rpcbindv3 and rpcbindv4 query
* functions. It can use a TI-RPC generated CLIENT.
*/
unsigned long nfs_pmap_getport(const struct sockaddr_in *sin,
const unsigned short transport,
const unsigned long program,
const unsigned long version,
const unsigned long protocol,
const struct timeval *timeout)
{
struct sockaddr_in address;
struct sockaddr *saddr = (struct sockaddr *)&address;
CLIENT *client;
struct pmap parms = {
.pm_prog = program,
.pm_vers = version,
.pm_prot = protocol,
};
struct timeval tout = { -1, 0 };
unsigned long port = 0;
if (timeout != NULL)
tout = *timeout;
nfs_clear_rpc_createerr();
memcpy(saddr, sin, sizeof(address));
client = nfs_gp_get_rpcbclient(saddr, (socklen_t)sizeof(*sin),
transport, PMAPVERS, &tout);
if (client != NULL) {
port = nfs_gp_pmap_getport(client, &parms, tout);
CLNT_DESTROY(client);
}
return port;
}
static const char *nfs_ns_pgmtbl[] = {
"status",
NULL,
};
/*
* nfs_probe_statd - use nfs_pmap_getport to see if statd is running locally
*
* Returns non-zero if statd is running locally.
*/
int nfs_probe_statd(void)
{
struct sockaddr_in addr = {
.sin_family = AF_INET,
.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
};
rpcprog_t program = nfs_getrpcbyname(NSMPROG, nfs_ns_pgmtbl);
return nfs_getport_ping((struct sockaddr *)(char *)&addr, sizeof(addr),
program, (rpcvers_t)1, IPPROTO_UDP);
}
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