#include <sys/types.h>
#include <sys/socket.h>
+#include <sys/wait.h>
#include <netinet/in.h>
#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>
#include "nls.h"
#include "nfs_mount.h"
#include "mount_constants.h"
+#include "nfsrpc.h"
#include "network.h"
-/*
- * Earlier versions of glibc's /usr/include/netdb.h exclude these
- * definitions because it was thought they were not part of a stable
- * POSIX standard. However, they are defined by RFC 2553 and 3493
- * and in POSIX 1003.1-2001, so these definitions were added in later
- * versions of netdb.h.
- */
-#ifndef AI_V4MAPPED
-#define AI_V4MAPPED 0x0008 /* IPv4-mapped addresses are acceptable. */
-#endif /* AI_V4MAPPED */
-#ifndef AI_ALL
-#define AI_ALL 0x0010 /* Return both IPv4 and IPv6 addresses. */
-#endif /* AI_ALL */
-#ifndef AI_ADDRCONFIG
-#define AI_ADDRCONFIG 0x0020 /* Use configuration of this host to choose \
- returned address type. */
-#endif /* AI_ADDRCONFIG */
-
#define PMAP_TIMEOUT (10)
#define CONNECT_TIMEOUT (20)
#define MOUNT_TIMEOUT (30)
extern char *progname;
extern int verbose;
+static const char *nfs_ns_pgmtbl[] = {
+ "status",
+ NULL,
+};
+
static const unsigned long nfs_to_mnt[] = {
0,
0,
0,
};
+static void nfs_set_port(struct sockaddr *sap, const unsigned short port)
+{
+ switch (sap->sa_family) {
+ case AF_INET:
+ ((struct sockaddr_in *)sap)->sin_port = htons(port);
+ break;
+ case AF_INET6:
+ ((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
+ break;
+ default:
+ nfs_error(_("%s: unrecognized address family in %s"),
+ progname, __func__);
+ }
+}
+
+#ifdef HAVE_DECL_AI_ADDRCONFIG
/**
* nfs_name_to_address - resolve hostname to an IPv4 or IPv6 socket address
* @hostname: pointer to C string containing DNS hostname to resolve
freeaddrinfo(gai_results);
return ret;
}
+#else /* HAVE_DECL_AI_ADDRCONFIG */
+/**
+ * nfs_name_to_address - resolve hostname to an IPv4 socket address
+ * @hostname: pointer to C string containing DNS hostname to resolve
+ * @af_hint: hint to restrict resolution to one address family
+ * @sap: pointer to buffer to fill with socket address
+ * @len: IN: size of buffer to fill; OUT: size of socket address
+ *
+ * Returns 1 and places a socket address at @sap if successful;
+ * otherwise zero.
+ *
+ * Some older getaddrinfo(3) implementations don't support
+ * AI_ADDRCONFIG or AI_V4MAPPED properly. For those cases, a DNS
+ * resolver based on the traditional gethostbyname(3) is provided.
+ */
+int nfs_name_to_address(const char *hostname,
+ const sa_family_t af_hint,
+ struct sockaddr *sap, socklen_t *salen)
+{
+ struct sockaddr_in *sin = (struct sockaddr_in *)sap;
+ socklen_t len = *salen;
+ struct hostent *hp;
+
+ *salen = 0;
+
+ if (af_hint != AF_INET) {
+ nfs_error(_("%s: address family not supported by DNS resolver\n"),
+ progname, hostname);
+ return 0;
+ }
+
+ sin->sin_family = AF_INET;
+ if (inet_aton(hostname, &sin->sin_addr)) {
+ *salen = sizeof(*sin);
+ return 1;
+ }
+
+ hp = gethostbyname(hostname);
+ if (hp == NULL) {
+ nfs_error(_("%s: DNS resolution failed for %s: %s"),
+ progname, hostname, hstrerror(h_errno));
+ return 0;
+ }
+
+ if (hp->h_length > len) {
+ nfs_error(_("%s: DNS resolution results too long for buffer\n"),
+ progname);
+ return 0;
+ }
+
+ memcpy(&sin->sin_addr, hp->h_addr, hp->h_length);
+ *salen = hp->h_length;
+ return 1;
+}
+#endif /* HAVE_DECL_AI_ADDRCONFIG */
/**
* nfs_gethostbyname - resolve a hostname to an IPv4 address
return RPC_ANYSOCK;
}
-/*
- * getport() is very similar to pmap_getport() with the exception that
- * this version tries to use an ephemeral port, since reserved ports are
- * not needed for GETPORT queries. This conserves the very limited
- * reserved port space, which helps reduce failed socket binds
- * during mount storms.
- *
- * A side effect of calling this function is that rpccreateerr is set.
- */
-static unsigned short getport(struct sockaddr_in *saddr,
- unsigned long program,
- unsigned long version,
- unsigned int proto)
+static void nfs_pp_debug(const struct sockaddr *sap, const socklen_t salen,
+ const rpcprog_t program, const rpcvers_t version,
+ const unsigned short protocol,
+ const unsigned short port)
{
- struct sockaddr_in bind_saddr;
- unsigned short port = 0;
- int socket;
- CLIENT *clnt = NULL;
- enum clnt_stat stat;
-
- bind_saddr = *saddr;
- bind_saddr.sin_port = htons(PMAPPORT);
-
- socket = get_socket(&bind_saddr, proto, PMAP_TIMEOUT, FALSE, TRUE);
- if (socket == RPC_ANYSOCK) {
- if (proto == IPPROTO_TCP &&
- rpc_createerr.cf_error.re_errno == ETIMEDOUT)
- rpc_createerr.cf_stat = RPC_TIMEDOUT;
- return 0;
- }
+ char buf[NI_MAXHOST];
- switch (proto) {
- case IPPROTO_UDP:
- clnt = clntudp_bufcreate(&bind_saddr,
- PMAPPROG, PMAPVERS,
- RETRY_TIMEOUT, &socket,
- RPCSMALLMSGSIZE,
- RPCSMALLMSGSIZE);
- break;
- case IPPROTO_TCP:
- clnt = clnttcp_create(&bind_saddr,
- PMAPPROG, PMAPVERS,
- &socket,
- RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
- break;
- }
- if (clnt != NULL) {
- struct pmap parms = {
- .pm_prog = program,
- .pm_vers = version,
- .pm_prot = proto,
- };
-
- stat = clnt_call(clnt, PMAPPROC_GETPORT,
- (xdrproc_t)xdr_pmap, (caddr_t)&parms,
- (xdrproc_t)xdr_u_short, (caddr_t)&port,
- TIMEOUT);
- if (stat) {
- clnt_geterr(clnt, &rpc_createerr.cf_error);
- rpc_createerr.cf_stat = stat;
- }
- clnt_destroy(clnt);
- if (stat != RPC_SUCCESS)
- port = 0;
- else if (port == 0)
- rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
+ if (!verbose)
+ return;
+
+ if (nfs_present_sockaddr(sap, salen, buf, sizeof(buf)) == 0) {
+ buf[0] = '\0';
+ strcat(buf, "unknown host");
}
- close(socket);
- return port;
+ fprintf(stderr, _("%s: trying %s prog %ld vers %ld prot %s port %d\n"),
+ progname, buf, program, version,
+ (protocol == IPPROTO_UDP ? _("UDP") : _("TCP")),
+ port);
}
/*
* Use the portmapper to discover whether or not the service we want is
* available. The lists 'versions' and 'protos' define ordered sequences
* of service versions and udp/tcp protocols to probe for.
+ *
+ * Returns 1 if the requested service port is unambiguous and pingable;
+ * @pmap is filled in with the version, port, and transport protocol used
+ * during the successful ping. Note that if a port is already specified
+ * in @pmap and it matches the rpcbind query result, nfs_probe_port() does
+ * not perform an RPC ping.
+ *
+ * If an error occurs or the requested service isn't available, zero is
+ * returned; rpccreateerr.cf_stat is set to reflect the nature of the error.
*/
-static int probe_port(clnt_addr_t *server, const unsigned long *versions,
- const unsigned int *protos)
+static int nfs_probe_port(const struct sockaddr *sap, const socklen_t salen,
+ struct pmap *pmap, const unsigned long *versions,
+ const unsigned int *protos)
{
- struct sockaddr_in *saddr = &server->saddr;
- struct pmap *pmap = &server->pmap;
+ struct sockaddr_storage address;
+ struct sockaddr *saddr = (struct sockaddr *)&address;
const unsigned long prog = pmap->pm_prog, *p_vers;
const unsigned int prot = (u_int)pmap->pm_prot, *p_prot;
const u_short port = (u_short) pmap->pm_port;
unsigned long vers = pmap->pm_vers;
unsigned short p_port;
+ memcpy(saddr, sap, salen);
p_prot = prot ? &prot : protos;
p_vers = vers ? &vers : versions;
rpc_createerr.cf_stat = 0;
+
for (;;) {
- p_port = getport(saddr, prog, *p_vers, *p_prot);
+ p_port = nfs_getport(saddr, salen, prog, *p_vers, *p_prot);
if (p_port) {
if (!port || port == p_port) {
- saddr->sin_port = htons(p_port);
- if (verbose) {
- printf(_("%s: trying %s prog %ld vers "
- "%ld prot %s port %d\n"),
- progname,
- inet_ntoa(saddr->sin_addr),
- prog, *p_vers,
- *p_prot == IPPROTO_UDP ?
- _("UDP") : _("TCP"),
- p_port);
- }
- if (clnt_ping(saddr, prog, *p_vers, *p_prot, NULL))
+ nfs_set_port(saddr, p_port);
+ nfs_pp_debug(saddr, salen, prog, *p_vers,
+ *p_prot, p_port);
+ if (nfs_rpc_ping(saddr, salen, prog,
+ *p_vers, *p_prot, NULL))
goto out_ok;
}
}
return 1;
}
-static int probe_nfsport(clnt_addr_t *nfs_server)
+/*
+ * Probe a server's NFS service to determine which versions and
+ * transport protocols are supported.
+ *
+ * Returns 1 if the requested service port is unambiguous and pingable;
+ * @pmap is filled in with the version, port, and transport protocol used
+ * during the successful ping. If all three are already specified, simply
+ * return success without an rpcbind query or RPC ping (we may be trying
+ * to mount an NFS service that is not advertised via rpcbind).
+ *
+ * If an error occurs or the requested service isn't available, zero is
+ * returned; rpccreateerr.cf_stat is set to reflect the nature of the error.
+ */
+static int nfs_probe_nfsport(const struct sockaddr *sap, const socklen_t salen,
+ struct pmap *pmap)
{
- struct pmap *pmap = &nfs_server->pmap;
-
if (pmap->pm_vers && pmap->pm_prot && pmap->pm_port)
return 1;
if (nfs_mount_data_version >= 4)
- return probe_port(nfs_server, probe_nfs3_first, probe_tcp_first);
+ return nfs_probe_port(sap, salen, pmap,
+ probe_nfs3_first, probe_tcp_first);
else
- return probe_port(nfs_server, probe_nfs2_only, probe_udp_only);
+ return nfs_probe_port(sap, salen, pmap,
+ probe_nfs2_only, probe_udp_only);
}
-static int probe_mntport(clnt_addr_t *mnt_server)
+/*
+ * Probe a server's mountd service to determine which versions and
+ * transport protocols are supported.
+ *
+ * Returns 1 if the requested service port is unambiguous and pingable;
+ * @pmap is filled in with the version, port, and transport protocol used
+ * during the successful ping. If all three are already specified, simply
+ * return success without an rpcbind query or RPC ping (we may be trying
+ * to mount an NFS service that is not advertised via rpcbind).
+ *
+ * If an error occurs or the requested service isn't available, zero is
+ * returned; rpccreateerr.cf_stat is set to reflect the nature of the error.
+ */
+static int nfs_probe_mntport(const struct sockaddr *sap, const socklen_t salen,
+ struct pmap *pmap)
{
- struct pmap *pmap = &mnt_server->pmap;
-
if (pmap->pm_vers && pmap->pm_prot && pmap->pm_port)
return 1;
if (nfs_mount_data_version >= 4)
- return probe_port(mnt_server, probe_mnt3_first, probe_udp_first);
+ return nfs_probe_port(sap, salen, pmap,
+ probe_mnt3_first, probe_udp_first);
else
- return probe_port(mnt_server, probe_mnt1_first, probe_udp_only);
+ return nfs_probe_port(sap, salen, pmap,
+ probe_mnt1_first, probe_udp_only);
}
-/**
- * probe_bothports - discover the RPC endpoints of mountd and NFS server
- * @mnt_server: pointer to address and pmap argument for mountd results
- * @nfs_server: pointer to address and pmap argument for NFS server
+/*
+ * Probe a server's mountd service to determine which versions and
+ * transport protocols are supported. Invoked when the protocol
+ * version is already known for both the NFS and mountd service.
*
- * Returns 1 if successful, otherwise zero if some error occurred.
- * Note that the arguments are both input and output arguments.
+ * Returns 1 and fills in both @pmap structs if the requested service
+ * ports are unambiguous and pingable. Otherwise zero is returned;
+ * rpccreateerr.cf_stat is set to reflect the nature of the error.
+ */
+static int nfs_probe_version_fixed(const struct sockaddr *mnt_saddr,
+ const socklen_t mnt_salen,
+ struct pmap *mnt_pmap,
+ const struct sockaddr *nfs_saddr,
+ const socklen_t nfs_salen,
+ struct pmap *nfs_pmap)
+{
+ if (!nfs_probe_nfsport(nfs_saddr, nfs_salen, nfs_pmap))
+ return 0;
+ return nfs_probe_mntport(mnt_saddr, mnt_salen, mnt_pmap);
+}
+
+/**
+ * nfs_probe_bothports - discover the RPC endpoints of mountd and NFS server
+ * @mnt_saddr: pointer to socket address of mountd server
+ * @mnt_salen: length of mountd server's address
+ * @mnt_pmap: IN: partially filled-in mountd RPC service tuple;
+ * OUT: fully filled-in mountd RPC service tuple
+ * @nfs_saddr: pointer to socket address of NFS server
+ * @nfs_salen: length of NFS server's address
+ * @nfs_pmap: IN: partially filled-in NFS RPC service tuple;
+ * OUT: fully filled-in NFS RPC service tuple
*
- * A side effect of calling this function is that rpccreateerr is set.
+ * Returns 1 and fills in both @pmap structs if the requested service
+ * ports are unambiguous and pingable. Otherwise zero is returned;
+ * rpccreateerr.cf_stat is set to reflect the nature of the error.
*/
-int probe_bothports(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server)
+int nfs_probe_bothports(const struct sockaddr *mnt_saddr,
+ const socklen_t mnt_salen,
+ struct pmap *mnt_pmap,
+ const struct sockaddr *nfs_saddr,
+ const socklen_t nfs_salen,
+ struct pmap *nfs_pmap)
{
- struct pmap *nfs_pmap = &nfs_server->pmap;
- struct pmap *mnt_pmap = &mnt_server->pmap;
struct pmap save_nfs, save_mnt;
- int res;
const unsigned long *probe_vers;
if (mnt_pmap->pm_vers && !nfs_pmap->pm_vers)
nfs_pmap->pm_vers = mntvers_to_nfs(mnt_pmap->pm_vers);
else if (nfs_pmap->pm_vers && !mnt_pmap->pm_vers)
mnt_pmap->pm_vers = nfsvers_to_mnt(nfs_pmap->pm_vers);
+
if (nfs_pmap->pm_vers)
- goto version_fixed;
+ return nfs_probe_version_fixed(mnt_saddr, mnt_salen, mnt_pmap,
+ nfs_saddr, nfs_salen, nfs_pmap);
memcpy(&save_nfs, nfs_pmap, sizeof(save_nfs));
memcpy(&save_mnt, mnt_pmap, sizeof(save_mnt));
for (; *probe_vers; probe_vers++) {
nfs_pmap->pm_vers = mntvers_to_nfs(*probe_vers);
- if ((res = probe_nfsport(nfs_server) != 0)) {
+ if (nfs_probe_nfsport(nfs_saddr, nfs_salen, nfs_pmap) != 0) {
mnt_pmap->pm_vers = *probe_vers;
- if ((res = probe_mntport(mnt_server)) != 0)
+ if (nfs_probe_mntport(mnt_saddr, mnt_salen, mnt_pmap) != 0)
return 1;
memcpy(mnt_pmap, &save_mnt, sizeof(*mnt_pmap));
}
case RPC_PROGNOTREGISTERED:
break;
default:
- goto out_bad;
+ return 0;
}
memcpy(nfs_pmap, &save_nfs, sizeof(*nfs_pmap));
}
-out_bad:
return 0;
-
-version_fixed:
- if (!probe_nfsport(nfs_server))
- goto out_bad;
- return probe_mntport(mnt_server);
}
-static int probe_statd(void)
+/**
+ * probe_bothports - discover the RPC endpoints of mountd and NFS server
+ * @mnt_server: pointer to address and pmap argument for mountd results
+ * @nfs_server: pointer to address and pmap argument for NFS server
+ *
+ * This is the legacy API that takes "clnt_addr_t" for both servers,
+ * but supports only AF_INET addresses.
+ *
+ * Returns 1 and fills in the pmap field in both clnt_addr_t structs
+ * if the requested service ports are unambiguous and pingable.
+ * Otherwise zero is returned; rpccreateerr.cf_stat is set to reflect
+ * the nature of the error.
+ */
+int probe_bothports(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server)
{
- struct sockaddr_in addr;
- unsigned short port;
-
- memset(&addr, 0, sizeof(addr));
- addr.sin_family = AF_INET;
- addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
- port = getport(&addr, 100024, 1, IPPROTO_UDP);
-
- if (port == 0)
- return 0;
- addr.sin_port = htons(port);
+ return nfs_probe_bothports((struct sockaddr *)&mnt_server->saddr,
+ sizeof(mnt_server->saddr),
+ &mnt_server->pmap,
+ (struct sockaddr *)&nfs_server->saddr,
+ sizeof(nfs_server->saddr),
+ &nfs_server->pmap);
+}
- if (clnt_ping(&addr, 100024, 1, IPPROTO_UDP, NULL) <= 0)
- return 0;
+static 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 1;
+ return nfs_getport_ping((struct sockaddr *)&addr, sizeof(addr),
+ program, (rpcvers_t)1, IPPROTO_UDP);
}
/**
struct stat stb;
#endif
- if (probe_statd())
+ if (nfs_probe_statd())
return 1;
#ifdef START_STATD
if (stat(START_STATD, &stb) == 0) {
if (S_ISREG(stb.st_mode) && (stb.st_mode & S_IXUSR)) {
- system(START_STATD);
- if (probe_statd())
+ pid_t pid = fork();
+ switch (pid) {
+ case 0: /* child */
+ execl(START_STATD, START_STATD, NULL);
+ exit(1);
+ case -1: /* error */
+ nfs_error(_("fork failed: %s"),
+ strerror(errno));
+ break;
+ default: /* parent */
+ waitpid(pid, NULL,0);
+ break;
+ }
+ if (nfs_probe_statd())
return 1;
}
}
*/
int nfs_call_umount(clnt_addr_t *mnt_server, dirpath *argp)
{
+ struct sockaddr *sap = (struct sockaddr *)&mnt_server->saddr;
+ socklen_t salen = sizeof(mnt_server->saddr);
+ struct pmap *pmap = &mnt_server->pmap;
CLIENT *clnt;
enum clnt_stat res = 0;
int msock;
- if (!probe_mntport(mnt_server))
+ if (!nfs_probe_mntport(sap, salen, pmap))
return 0;
clnt = mnt_openclnt(mnt_server, &msock);
if (!clnt)
* @prot: target RPC protocol
* @caddr: filled in with our network address
*
- * Sigh... getport() doesn't actually check the version number.
+ * Sigh... GETPORT queries don't actually check the version number.
* In order to make sure that the server actually supports the service
- * we're requesting, we open and RPC client, and fire off a NULL
+ * we're requesting, we open an RPC client, and fire off a NULL
* RPC call.
*
* caddr is the network address that the server will use to call us back.
projects / nfs-utils.git / blobdiff