*
*/
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
#include <ctype.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <netdb.h>
#include <time.h>
+
+#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 <rpc/pmap_clnt.h>
-#include <sys/socket.h>
-#include "conn.h"
#include "xcommon.h"
#include "mount.h"
#include "nls.h"
-#include "nfsumount.h"
#include "nfs_mount.h"
#include "mount_constants.h"
+#include "nfsrpc.h"
#include "network.h"
-#ifdef HAVE_RPCSVC_NFS_PROT_H
-#include <rpcsvc/nfs_prot.h>
-#else
-#include <linux/nfs.h>
-#define nfsstat nfs_stat
-#endif
+/*
+ * 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)
-#ifndef NFS_PORT
-#define NFS_PORT 2049
+#if SIZEOF_SOCKLEN_T - 0 == 0
+#define socklen_t unsigned int
#endif
extern int nfs_mount_data_version;
extern char *progname;
extern int verbose;
+static const char *nfs_ns_pgmtbl[] = {
+ "status",
+ NULL,
+};
+
+static const unsigned long nfs_to_mnt[] = {
+ 0,
+ 0,
+ 1,
+ 3,
+};
+
+static const unsigned long mnt_to_nfs[] = {
+ 0,
+ 2,
+ 2,
+ 3,
+};
+
+/*
+ * Map an NFS version into the corresponding Mountd version
+ */
+unsigned long nfsvers_to_mnt(const unsigned long vers)
+{
+ if (vers <= 3)
+ return nfs_to_mnt[vers];
+ return 0;
+}
+
+/*
+ * Map a Mountd version into the corresponding NFS version
+ */
+static unsigned long mntvers_to_nfs(const unsigned long vers)
+{
+ if (vers <= 3)
+ return mnt_to_nfs[vers];
+ return 0;
+}
+
static const unsigned int probe_udp_only[] = {
IPPROTO_UDP,
0,
0,
};
-int nfs_gethostbyname(const char *hostname, struct sockaddr_in *saddr)
+static void nfs_set_port(struct sockaddr *sap, const unsigned short port)
{
- struct hostent *hp;
+ 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__);
+ }
+}
- saddr->sin_family = AF_INET;
- if (!inet_aton(hostname, &saddr->sin_addr)) {
- if ((hp = gethostbyname(hostname)) == NULL) {
- nfs_error(_("mount: can't get address for %s\n"),
- hostname);
- return 0;
- } else {
- if (hp->h_length > sizeof(*saddr)) {
- nfs_error(_("mount: got bad hp->h_length\n"));
- hp->h_length = sizeof(*saddr);
+/**
+ * nfs_name_to_address - resolve hostname to an IPv4 or IPv6 socket address
+ * @hostname: pointer to C string containing DNS hostname to resolve
+ * @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.
+ */
+int nfs_name_to_address(const char *hostname,
+ const sa_family_t af_hint,
+ struct sockaddr *sap, socklen_t *salen)
+{
+ struct addrinfo *gai_results;
+ struct addrinfo gai_hint = {
+ .ai_family = af_hint,
+ .ai_flags = AI_ADDRCONFIG,
+ };
+ socklen_t len = *salen;
+ int error, ret = 0;
+
+ if (af_hint == AF_INET6)
+ gai_hint.ai_flags |= AI_V4MAPPED|AI_ALL;
+
+ *salen = 0;
+
+ error = getaddrinfo(hostname, NULL, &gai_hint, &gai_results);
+ if (error) {
+ nfs_error(_("%s: DNS resolution failed for %s: %s"),
+ progname, hostname, (error == EAI_SYSTEM ?
+ strerror(errno) : gai_strerror(error)));
+ return ret;
+ }
+
+ switch (gai_results->ai_addr->sa_family) {
+ case AF_INET:
+ case AF_INET6:
+ if (len >= gai_results->ai_addrlen) {
+ *salen = gai_results->ai_addrlen;
+ memcpy(sap, gai_results->ai_addr, *salen);
+ ret = 1;
+ }
+ break;
+ default:
+ /* things are really broken if we get here, so warn */
+ nfs_error(_("%s: unrecognized DNS resolution results for %s"),
+ progname, hostname);
+ break;
+ }
+
+ freeaddrinfo(gai_results);
+ return ret;
+}
+
+/**
+ * nfs_gethostbyname - resolve a hostname to an IPv4 address
+ * @hostname: pointer to a C string containing a DNS hostname
+ * @saddr: returns an IPv4 address
+ *
+ * Returns 1 if successful, otherwise zero.
+ */
+int nfs_gethostbyname(const char *hostname, struct sockaddr_in *sin)
+{
+ socklen_t len = sizeof(*sin);
+
+ return nfs_name_to_address(hostname, AF_INET,
+ (struct sockaddr *)sin, &len);
+}
+
+/**
+ * nfs_string_to_sockaddr - convert string address to sockaddr
+ * @address: pointer to presentation format address to convert
+ * @addrlen: length of presentation address
+ * @sap: pointer to socket address buffer to fill in
+ * @salen: IN: length of address buffer
+ * OUT: length of converted socket address
+ *
+ * Convert a presentation format address string to a socket address.
+ * Similar to nfs_name_to_address(), but the DNS query is squelched,
+ * and won't make any noise if the getaddrinfo() call fails.
+ *
+ * Returns 1 and fills in @sap and @salen if successful; otherwise zero.
+ *
+ * See RFC 4038 section 5.1 or RFC 3513 section 2.2 for more details
+ * on presenting IPv6 addresses as text strings.
+ */
+int nfs_string_to_sockaddr(const char *address, const size_t addrlen,
+ struct sockaddr *sap, socklen_t *salen)
+{
+ struct addrinfo *gai_results;
+ struct addrinfo gai_hint = {
+ .ai_flags = AI_NUMERICHOST,
+ };
+ socklen_t len = *salen;
+ int ret = 0;
+
+ *salen = 0;
+
+ if (getaddrinfo(address, NULL, &gai_hint, &gai_results) == 0) {
+ switch (gai_results->ai_addr->sa_family) {
+ case AF_INET:
+ case AF_INET6:
+ if (len >= gai_results->ai_addrlen) {
+ *salen = gai_results->ai_addrlen;
+ memcpy(sap, gai_results->ai_addr, *salen);
+ ret = 1;
}
- memcpy(&saddr->sin_addr, hp->h_addr, hp->h_length);
+ break;
}
+ freeaddrinfo(gai_results);
}
- return 1;
+
+ return ret;
+}
+
+/**
+ * nfs_present_sockaddr - convert sockaddr to string
+ * @sap: pointer to socket address to convert
+ * @salen: length of socket address
+ * @buf: pointer to buffer to fill in
+ * @buflen: length of buffer
+ *
+ * Convert the passed-in sockaddr-style address to presentation format.
+ * The presentation format address is placed in @buf and is
+ * '\0'-terminated.
+ *
+ * Returns 1 if successful; otherwise zero.
+ *
+ * See RFC 4038 section 5.1 or RFC 3513 section 2.2 for more details
+ * on presenting IPv6 addresses as text strings.
+ */
+int nfs_present_sockaddr(const struct sockaddr *sap, const socklen_t salen,
+ char *buf, const size_t buflen)
+{
+#ifdef HAVE_GETNAMEINFO
+ int result;
+
+ result = getnameinfo(sap, salen, buf, buflen,
+ NULL, 0, NI_NUMERICHOST);
+ if (!result)
+ return 1;
+
+ nfs_error(_("%s: invalid server address: %s"), progname,
+ gai_strerror(result));
+ return 0;
+#else /* HAVE_GETNAMEINFO */
+ char *addr;
+
+ if (sap->sa_family == AF_INET) {
+ addr = inet_ntoa(((struct sockaddr_in *)sap)->sin_addr);
+ if (addr && strlen(addr) < buflen) {
+ strcpy(buf, addr);
+ return 1;
+ }
+ }
+
+ nfs_error(_("%s: invalid server address"), progname);
+ return 0;
+#endif /* HAVE_GETNAMEINFO */
}
/*
- * getport() is very similar to pmap_getport() with
- * the exception this version uses a non-reserve ports
- * instead of reserve ports since reserve ports
- * are not needed for pmap requests.
+ * Attempt to connect a socket, but time out after "timeout" seconds.
+ *
+ * On error return, caller closes the socket.
*/
-unsigned short getport(struct sockaddr_in *saddr, unsigned long prog,
- unsigned long vers, unsigned int prot)
+static int connect_to(int fd, struct sockaddr *addr,
+ socklen_t addrlen, int timeout)
{
- unsigned short port = 0;
- int socket;
- CLIENT *clnt = NULL;
- struct pmap parms;
- enum clnt_stat stat;
+ int ret, saved;
+ fd_set rset, wset;
+ struct timeval tv = {
+ .tv_sec = timeout,
+ };
- saddr->sin_port = htons (PMAPPORT);
- socket = get_socket(saddr, prot, FALSE, FALSE);
+ saved = fcntl(fd, F_GETFL, 0);
+ fcntl(fd, F_SETFL, saved | O_NONBLOCK);
- switch (prot) {
- case IPPROTO_UDP:
- clnt = clntudp_bufcreate(saddr,
- PMAPPROG, PMAPVERS, TIMEOUT, &socket,
- UDPMSGSIZE, UDPMSGSIZE);
- break;
- case IPPROTO_TCP:
- clnt = clnttcp_create(saddr,
- PMAPPROG, PMAPVERS, &socket, 50, 500);
- break;
+ ret = connect(fd, addr, addrlen);
+ if (ret < 0 && errno != EINPROGRESS)
+ return -1;
+ if (ret == 0)
+ goto out;
+
+ FD_ZERO(&rset);
+ FD_SET(fd, &rset);
+ wset = rset;
+ ret = select(fd + 1, &rset, &wset, NULL, &tv);
+ if (ret == 0) {
+ errno = ETIMEDOUT;
+ return -1;
}
- if (clnt != NULL) {
- parms.pm_prog = prog;
- parms.pm_vers = vers;
- parms.pm_prot = prot;
- parms.pm_port = 0; /* not needed or used */
-
- 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;
+ if (FD_ISSET(fd, &rset) || FD_ISSET(fd, &wset)) {
+ int error;
+ socklen_t len = sizeof(error);
+ if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len) < 0)
+ return -1;
+ if (error) {
+ errno = error;
+ return -1;
}
- clnt_destroy(clnt);
- if (stat != RPC_SUCCESS)
- port = 0;
- else if (port == 0)
- rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
+ } else
+ return -1;
+
+out:
+ fcntl(fd, F_SETFL, saved);
+ return 0;
+}
+
+/*
+ * Create a socket that is locally bound to a reserved or non-reserved port.
+ *
+ * The caller should check rpc_createerr to determine the cause of any error.
+ */
+static int get_socket(struct sockaddr_in *saddr, unsigned int p_prot,
+ unsigned int timeout, int resvp, int conn)
+{
+ int so, cc, type;
+ struct sockaddr_in laddr;
+ socklen_t namelen = sizeof(laddr);
+
+ type = (p_prot == IPPROTO_UDP ? SOCK_DGRAM : SOCK_STREAM);
+ if ((so = socket (AF_INET, type, p_prot)) < 0)
+ goto err_socket;
+
+ laddr.sin_family = AF_INET;
+ laddr.sin_port = 0;
+ laddr.sin_addr.s_addr = htonl(INADDR_ANY);
+ if (resvp) {
+ if (bindresvport(so, &laddr) < 0)
+ goto err_bindresvport;
+ } else {
+ cc = bind(so, (struct sockaddr *)&laddr, namelen);
+ if (cc < 0)
+ goto err_bind;
+ }
+ if (type == SOCK_STREAM || (conn && type == SOCK_DGRAM)) {
+ cc = connect_to(so, (struct sockaddr *)saddr, namelen,
+ timeout);
+ if (cc < 0)
+ goto err_connect;
+ }
+ return so;
+
+err_socket:
+ rpc_createerr.cf_stat = RPC_SYSTEMERROR;
+ rpc_createerr.cf_error.re_errno = errno;
+ if (verbose) {
+ nfs_error(_("%s: Unable to create %s socket: errno %d (%s)\n"),
+ progname, p_prot == IPPROTO_UDP ? _("UDP") : _("TCP"),
+ errno, strerror(errno));
+ }
+ return RPC_ANYSOCK;
+
+err_bindresvport:
+ rpc_createerr.cf_stat = RPC_SYSTEMERROR;
+ rpc_createerr.cf_error.re_errno = errno;
+ if (verbose) {
+ nfs_error(_("%s: Unable to bindresvport %s socket: errno %d"
+ " (%s)\n"),
+ progname, p_prot == IPPROTO_UDP ? _("UDP") : _("TCP"),
+ errno, strerror(errno));
+ }
+ close(so);
+ return RPC_ANYSOCK;
+
+err_bind:
+ rpc_createerr.cf_stat = RPC_SYSTEMERROR;
+ rpc_createerr.cf_error.re_errno = errno;
+ if (verbose) {
+ nfs_error(_("%s: Unable to bind to %s socket: errno %d (%s)\n"),
+ progname, p_prot == IPPROTO_UDP ? _("UDP") : _("TCP"),
+ errno, strerror(errno));
+ }
+ close(so);
+ return RPC_ANYSOCK;
+
+err_connect:
+ rpc_createerr.cf_stat = RPC_SYSTEMERROR;
+ rpc_createerr.cf_error.re_errno = errno;
+ if (verbose) {
+ nfs_error(_("%s: Unable to connect to %s:%d, errno %d (%s)\n"),
+ progname, inet_ntoa(saddr->sin_addr),
+ ntohs(saddr->sin_port), errno, strerror(errno));
}
- if (socket != 1)
- close(socket);
+ close(so);
+ return RPC_ANYSOCK;
+}
+
+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)
+{
+ char buf[NI_MAXHOST];
+
+ if (!verbose)
+ return;
- return port;
+ if (nfs_present_sockaddr(sap, salen, buf, sizeof(buf)) == 0) {
+ buf[0] = '\0';
+ strcat(buf, "unknown host");
+ }
+
+ 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 (;;) {
- saddr->sin_port = htons(PMAPPORT);
- 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;
- if (rpc_createerr.cf_stat == RPC_TIMEDOUT)
- goto out_bad;
}
}
- if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED)
+ if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED &&
+ rpc_createerr.cf_stat != RPC_TIMEDOUT &&
+ rpc_createerr.cf_stat != RPC_CANTRECV &&
+ rpc_createerr.cf_stat != RPC_PROGVERSMISMATCH)
goto out_bad;
if (!prot) {
continue;
p_prot = protos;
}
- if (vers == pmap->pm_vers) {
- p_vers = versions;
- vers = 0;
- }
+ if (rpc_createerr.cf_stat == RPC_TIMEDOUT ||
+ rpc_createerr.cf_stat == RPC_CANTRECV)
+ goto out_bad;
+
if (vers || !*++p_vers)
break;
}
return 1;
}
-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);
}
-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
+ *
+ * Returns 1 if successful, otherwise zero if some error occurred.
+ * Note that the arguments are both input and output arguments.
+ *
+ * A side effect of calling this function is that rpccreateerr is set.
+ */
int probe_bothports(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server)
{
+ struct sockaddr *nfs_saddr = (struct sockaddr *)&nfs_server->saddr;
+ socklen_t nfs_salen = sizeof(nfs_server->saddr);
+ struct sockaddr *mnt_saddr = (struct sockaddr *)&mnt_server->saddr;
+ socklen_t mnt_salen = sizeof(mnt_server->saddr);
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)
for (; *probe_vers; probe_vers++) {
nfs_pmap->pm_vers = mntvers_to_nfs(*probe_vers);
- if ((res = probe_nfsport(nfs_server) != 0)) {
- mnt_pmap->pm_vers = nfsvers_to_mnt(nfs_pmap->pm_vers);
- if ((res = probe_mntport(mnt_server)) != 0)
+ if (nfs_probe_nfsport(nfs_saddr, nfs_salen, nfs_pmap) != 0) {
+ mnt_pmap->pm_vers = *probe_vers;
+ if (nfs_probe_mntport(mnt_saddr, mnt_salen, mnt_pmap) != 0)
return 1;
memcpy(mnt_pmap, &save_mnt, sizeof(*mnt_pmap));
}
return 0;
version_fixed:
- if (!probe_nfsport(nfs_server))
+ if (!nfs_probe_nfsport(nfs_saddr, nfs_salen, nfs_pmap))
goto out_bad;
- return probe_mntport(mnt_server);
+ return nfs_probe_mntport(mnt_saddr, mnt_salen, mnt_pmap);
+}
+
+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 nfs_getport_ping((struct sockaddr *)&addr, sizeof(addr),
+ program, (rpcvers_t)1, IPPROTO_UDP);
+}
+
+/**
+ * start_statd - attempt to start rpc.statd
+ *
+ * Returns 1 if statd is running; otherwise zero.
+ */
+int start_statd(void)
+{
+#ifdef START_STATD
+ struct stat stb;
+#endif
+
+ 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)) {
+ 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;
+ }
+ }
+#endif
+
+ return 0;
+}
+
+/**
+ * nfs_call_umount - ask the server to remove a share from it's rmtab
+ * @mnt_server: address of RPC MNT program server
+ * @argp: directory path of share to "unmount"
+ *
+ * Returns one if the unmount call succeeded; zero if the unmount
+ * failed for any reason.
+ *
+ * Note that a side effect of calling this function is that rpccreateerr
+ * is set.
+ */
+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 (!nfs_probe_mntport(sap, salen, pmap))
+ return 0;
+ clnt = mnt_openclnt(mnt_server, &msock);
+ if (!clnt)
+ return 0;
+ res = clnt_call(clnt, MOUNTPROC_UMNT,
+ (xdrproc_t)xdr_dirpath, (caddr_t)argp,
+ (xdrproc_t)xdr_void, NULL,
+ TIMEOUT);
+ mnt_closeclnt(clnt, msock);
+
+ if (res == RPC_SUCCESS)
+ return 1;
+ return 0;
+}
+
+/**
+ * mnt_openclnt - get a handle for a remote mountd service
+ * @mnt_server: address and pmap arguments of mountd service
+ * @msock: returns a file descriptor of the underlying transport socket
+ *
+ * Returns an active handle for the remote's mountd service
+ */
+CLIENT *mnt_openclnt(clnt_addr_t *mnt_server, int *msock)
+{
+ struct sockaddr_in *mnt_saddr = &mnt_server->saddr;
+ struct pmap *mnt_pmap = &mnt_server->pmap;
+ CLIENT *clnt = NULL;
+
+ mnt_saddr->sin_port = htons((u_short)mnt_pmap->pm_port);
+ *msock = get_socket(mnt_saddr, mnt_pmap->pm_prot, MOUNT_TIMEOUT,
+ TRUE, FALSE);
+ if (*msock == RPC_ANYSOCK) {
+ if (rpc_createerr.cf_error.re_errno == EADDRINUSE)
+ /*
+ * Probably in-use by a TIME_WAIT connection,
+ * It is worth waiting a while and trying again.
+ */
+ rpc_createerr.cf_stat = RPC_TIMEDOUT;
+ return NULL;
+ }
+
+ switch (mnt_pmap->pm_prot) {
+ case IPPROTO_UDP:
+ clnt = clntudp_bufcreate(mnt_saddr,
+ mnt_pmap->pm_prog, mnt_pmap->pm_vers,
+ RETRY_TIMEOUT, msock,
+ MNT_SENDBUFSIZE, MNT_RECVBUFSIZE);
+ break;
+ case IPPROTO_TCP:
+ clnt = clnttcp_create(mnt_saddr,
+ mnt_pmap->pm_prog, mnt_pmap->pm_vers,
+ msock,
+ MNT_SENDBUFSIZE, MNT_RECVBUFSIZE);
+ break;
+ }
+ if (clnt) {
+ /* try to mount hostname:dirname */
+ clnt->cl_auth = authunix_create_default();
+ return clnt;
+ }
+ return NULL;
+}
+
+/**
+ * mnt_closeclnt - terminate a handle for a remote mountd service
+ * @clnt: pointer to an active handle for a remote mountd service
+ * @msock: file descriptor of the underlying transport socket
+ *
+ */
+void mnt_closeclnt(CLIENT *clnt, int msock)
+{
+ auth_destroy(clnt->cl_auth);
+ clnt_destroy(clnt);
+ close(msock);
+}
+
+/**
+ * clnt_ping - send an RPC ping to the remote RPC service endpoint
+ * @saddr: server's address
+ * @prog: target RPC program number
+ * @vers: target RPC version number
+ * @prot: target RPC protocol
+ * @caddr: filled in with our network address
+ *
+ * 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 an RPC client, and fire off a NULL
+ * RPC call.
+ *
+ * caddr is the network address that the server will use to call us back.
+ * On multi-homed clients, this address depends on which NIC we use to
+ * route requests to the server.
+ *
+ * Returns one if successful, otherwise zero.
+ */
+int clnt_ping(struct sockaddr_in *saddr, const unsigned long prog,
+ const unsigned long vers, const unsigned int prot,
+ struct sockaddr_in *caddr)
+{
+ CLIENT *clnt = NULL;
+ int sock, stat;
+ static char clnt_res;
+ struct sockaddr dissolve;
+
+ rpc_createerr.cf_stat = stat = 0;
+ sock = get_socket(saddr, prot, CONNECT_TIMEOUT, FALSE, TRUE);
+ if (sock == RPC_ANYSOCK) {
+ if (rpc_createerr.cf_error.re_errno == ETIMEDOUT) {
+ /*
+ * TCP timeout. Bubble up the error to see
+ * how it should be handled.
+ */
+ rpc_createerr.cf_stat = RPC_TIMEDOUT;
+ }
+ return 0;
+ }
+
+ if (caddr) {
+ /* Get the address of our end of this connection */
+ socklen_t len = sizeof(*caddr);
+ if (getsockname(sock, caddr, &len) != 0)
+ caddr->sin_family = 0;
+ }
+
+ switch(prot) {
+ case IPPROTO_UDP:
+ /* The socket is connected (so we could getsockname successfully),
+ * but some servers on multi-homed hosts reply from
+ * the wrong address, so if we stay connected, we lose the reply.
+ */
+ dissolve.sa_family = AF_UNSPEC;
+ connect(sock, &dissolve, sizeof(dissolve));
+
+ clnt = clntudp_bufcreate(saddr, prog, vers,
+ RETRY_TIMEOUT, &sock,
+ RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
+ break;
+ case IPPROTO_TCP:
+ clnt = clnttcp_create(saddr, prog, vers, &sock,
+ RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
+ break;
+ }
+ if (!clnt) {
+ close(sock);
+ return 0;
+ }
+ memset(&clnt_res, 0, sizeof(clnt_res));
+ stat = clnt_call(clnt, NULLPROC,
+ (xdrproc_t)xdr_void, (caddr_t)NULL,
+ (xdrproc_t)xdr_void, (caddr_t)&clnt_res,
+ TIMEOUT);
+ if (stat) {
+ clnt_geterr(clnt, &rpc_createerr.cf_error);
+ rpc_createerr.cf_stat = stat;
+ }
+ clnt_destroy(clnt);
+ close(sock);
+
+ if (stat == RPC_SUCCESS)
+ return 1;
+ else
+ return 0;
+}
+
+/*
+ * Try a getsockname() on a connected datagram socket.
+ *
+ * Returns 1 and fills in @buf if successful; otherwise, zero.
+ *
+ * A connected datagram socket prevents leaving a socket in TIME_WAIT.
+ * This conserves the ephemeral port number space, helping reduce failed
+ * socket binds during mount storms.
+ */
+static int nfs_ca_sockname(const struct sockaddr *sap, const socklen_t salen,
+ struct sockaddr *buf, socklen_t *buflen)
+{
+ struct sockaddr_in sin = {
+ .sin_family = AF_INET,
+ .sin_addr.s_addr = htonl(INADDR_ANY),
+ };
+ struct sockaddr_in6 sin6 = {
+ .sin6_family = AF_INET6,
+ .sin6_addr = IN6ADDR_ANY_INIT,
+ };
+ int sock;
+
+ sock = socket(sap->sa_family, SOCK_DGRAM, IPPROTO_UDP);
+ if (sock < 0)
+ return 0;
+
+ switch (sap->sa_family) {
+ case AF_INET:
+ if (bind(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
+ close(sock);
+ return 0;
+ }
+ break;
+ case AF_INET6:
+ if (bind(sock, (struct sockaddr *)&sin6, sizeof(sin6)) < 0) {
+ close(sock);
+ return 0;
+ }
+ break;
+ default:
+ errno = EAFNOSUPPORT;
+ return 0;
+ }
+
+ if (connect(sock, sap, salen) < 0) {
+ close(sock);
+ return 0;
+ }
+
+ return !getsockname(sock, buf, buflen);
+}
+
+/*
+ * Try to generate an address that prevents the server from calling us.
+ *
+ * Returns 1 and fills in @buf if successful; otherwise, zero.
+ */
+static int nfs_ca_gai(const struct sockaddr *sap, const socklen_t salen,
+ struct sockaddr *buf, socklen_t *buflen)
+{
+ struct addrinfo *gai_results;
+ struct addrinfo gai_hint = {
+ .ai_family = sap->sa_family,
+ .ai_flags = AI_PASSIVE, /* ANYADDR */
+ };
+
+ if (getaddrinfo(NULL, "", &gai_hint, &gai_results))
+ return 0;
+
+ *buflen = gai_results->ai_addrlen;
+ memcpy(buf, gai_results->ai_addr, *buflen);
+
+ freeaddrinfo(gai_results);
+
+ return 1;
+}
+
+/**
+ * nfs_callback_address - acquire our local network address
+ * @sap: pointer to address of remote
+ * @sap_len: length of address
+ * @buf: pointer to buffer to be filled in with local network address
+ * @buflen: IN: length of buffer to fill in; OUT: length of filled-in address
+ *
+ * Discover a network address that an NFSv4 server can use to call us back.
+ * On multi-homed clients, this address depends on which NIC we use to
+ * route requests to the server.
+ *
+ * Returns 1 and fills in @buf if an unambiguous local address is
+ * available; returns 1 and fills in an appropriate ANYADDR address
+ * if a local address isn't available; otherwise, returns zero.
+ */
+int nfs_callback_address(const struct sockaddr *sap, const socklen_t salen,
+ struct sockaddr *buf, socklen_t *buflen)
+{
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
+
+ if (nfs_ca_sockname(sap, salen, buf, buflen) == 0)
+ if (nfs_ca_gai(sap, salen, buf, buflen) == 0)
+ goto out_failed;
+
+ /*
+ * The server can't use an interface ID that was generated
+ * here on the client, so always clear sin6_scope_id.
+ */
+ if (sin6->sin6_family == AF_INET6)
+ sin6->sin6_scope_id = 0;
+
+ return 1;
+
+out_failed:
+ *buflen = 0;
+ if (verbose)
+ nfs_error(_("%s: failed to construct callback address"));
+ return 0;
+
}
projects / nfs-utils.git / blobdiff