/* * Guillaume Cottenceau (gc) * * Copyright 2003 Mandriva * * This software may be freely redistributed under the terms of the GNU * public license. * * 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., 675 Mass Ave, Cambridge, MA 02139, USA. * * basing on nfsmount.c from util-linux-2.11z: * - use our logging facilities * - use our host resolving stuff * - remove unneeded code */ /* * nfsmount.c -- Linux NFS mount * Copyright (C) 1993 Rick Sladkey * * 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, 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. * * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port * numbers to be specified on the command line. * * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler : * Omit the call to connect() for Linux version 1.3.11 or later. * * Wed Oct 1 23:55:28 1997: Dick Streefland * Implemented the "bg", "fg" and "retry" mount options for NFS. * * 1999-02-22 Arkadiusz Miśkiewicz * - added Native Language Support * * Modified by Olaf Kirch and Trond Myklebust for new NFS code, * plus NFSv3 stuff. * * 2003-04-14 David Black * - added support for multiple hostname NFS mounts */ /* * nfsmount.c,v 1.1.1.1 1993/11/18 08:40:51 jrs Exp */ #define HAVE_rpcsvc_nfs_prot_h #define HAVE_inet_aton #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "nfsmount.h" #ifdef HAVE_rpcsvc_nfs_prot_h #include #else #include #define nfsstat nfs_stat #endif #include "nfs_mount4.h" #include "log.h" #include "dns.h" #ifndef NFS_PORT #define NFS_PORT 2049 #endif #ifndef NFS_FHSIZE #define NFS_FHSIZE 32 #endif static char *nfs_strerror(int stat); #define MAKE_VERSION(p,q,r) (65536*(p) + 256*(q) + (r)) #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2) bool_t xdr_fhandle3 (XDR *xdrs, fhandle3 *objp) { if (!xdr_bytes (xdrs, (char **)&objp->fhandle3_val, (u_int *) &objp->fhandle3_len, FHSIZE3)) return FALSE; return TRUE; } bool_t xdr_mountstat3 (XDR *xdrs, mountstat3 *objp) { if (!xdr_enum (xdrs, (enum_t *) objp)) return FALSE; return TRUE; } bool_t xdr_mountres3_ok (XDR *xdrs, mountres3_ok *objp) { if (!xdr_fhandle3 (xdrs, &objp->fhandle)) return FALSE; if (!xdr_array (xdrs, (char **)&objp->auth_flavours.auth_flavours_val, (u_int *) &objp->auth_flavours.auth_flavours_len, ~0, sizeof (int), (xdrproc_t) xdr_int)) return FALSE; return TRUE; } bool_t xdr_mountres3 (XDR *xdrs, mountres3 *objp) { if (!xdr_mountstat3 (xdrs, &objp->fhs_status)) return FALSE; switch (objp->fhs_status) { case MNT_OK: if (!xdr_mountres3_ok (xdrs, &objp->mountres3_u.mountinfo)) return FALSE; break; default: break; } return TRUE; } bool_t xdr_dirpath (XDR *xdrs, dirpath *objp) { if (!xdr_string (xdrs, objp, MNTPATHLEN)) return FALSE; return TRUE; } bool_t xdr_fhandle (XDR *xdrs, fhandle objp) { if (!xdr_opaque (xdrs, objp, FHSIZE)) return FALSE; return TRUE; } bool_t xdr_fhstatus (XDR *xdrs, fhstatus *objp) { if (!xdr_u_int (xdrs, &objp->fhs_status)) return FALSE; switch (objp->fhs_status) { case 0: if (!xdr_fhandle (xdrs, objp->fhstatus_u.fhs_fhandle)) return FALSE; break; default: break; } return TRUE; } static int linux_version_code(void) { struct utsname my_utsname; int p, q, r; if (uname(&my_utsname) == 0) { p = atoi(strtok(my_utsname.release, ".")); q = atoi(strtok(NULL, ".")); r = atoi(strtok(NULL, ".")); return MAKE_VERSION(p,q,r); } return 0; } /* * Unfortunately, the kernel prints annoying console messages * in case of an unexpected nfs mount version (instead of * just returning some error). Therefore we'll have to try * and figure out what version the kernel expects. * * Variables: * NFS_MOUNT_VERSION: these nfsmount sources at compile time * nfs_mount_version: version this source and running kernel can handle */ static int find_kernel_nfs_mount_version(void) { static int kernel_version = -1; int nfs_mount_version = NFS_MOUNT_VERSION; if (kernel_version == -1) kernel_version = linux_version_code(); if (kernel_version) { if (kernel_version < MAKE_VERSION(2,1,32)) nfs_mount_version = 1; else if (kernel_version < MAKE_VERSION(2,2,18)) nfs_mount_version = 3; else if (kernel_version < MAKE_VERSION(2,3,0)) nfs_mount_version = 4; /* since 2.2.18pre9 */ else if (kernel_version < MAKE_VERSION(2,3,99)) nfs_mount_version = 3; else nfs_mount_version = 4; /* since 2.3.99pre4 */ } if (nfs_mount_version > NFS_MOUNT_VERSION) nfs_mount_version = NFS_MOUNT_VERSION; log_message("nfsmount: kernel_nfs_mount_version: %d", nfs_mount_version); return nfs_mount_version; } static struct pmap * get_mountport(struct sockaddr_in *server_addr, long unsigned prog, long unsigned version, long unsigned proto, long unsigned port, int nfs_mount_version) { struct pmaplist *pmap; static struct pmap p = {0, 0, 0, 0}; if (version > MAX_NFSPROT) version = MAX_NFSPROT; if (!prog) prog = MOUNTPROG; p.pm_prog = prog; p.pm_vers = version; p.pm_prot = proto; p.pm_port = port; server_addr->sin_port = PMAPPORT; pmap = pmap_getmaps(server_addr); while (pmap) { if (pmap->pml_map.pm_prog != prog) goto next; if (!version && p.pm_vers > pmap->pml_map.pm_vers) goto next; if (version > 2 && pmap->pml_map.pm_vers != version) goto next; if (version && version <= 2 && pmap->pml_map.pm_vers > 2) goto next; if (pmap->pml_map.pm_vers > MAX_NFSPROT || (proto && p.pm_prot && pmap->pml_map.pm_prot != proto) || (port && pmap->pml_map.pm_port != port)) goto next; memcpy(&p, &pmap->pml_map, sizeof(p)); next: pmap = pmap->pml_next; } if (!p.pm_vers) p.pm_vers = MOUNTVERS; if (!p.pm_prot) p.pm_prot = IPPROTO_TCP; return &p; } int nfsmount_prepare(const char *spec, char **mount_opts) { char hostdir[1024]; CLIENT *mclient; char *hostname, *dirname, *mounthost = NULL; struct timeval total_timeout; enum clnt_stat clnt_stat; static struct nfs_mount_data data; int nfs_mount_version; struct sockaddr_in server_addr; struct sockaddr_in mount_server_addr; struct pmap *pm_mnt; int msock, fsock; struct timeval retry_timeout; union { struct fhstatus nfsv2; struct mountres3 nfsv3; } status; char *s; int port, mountport, proto, soft, intr; int posix, nocto, noac, broken_suid, nolock; int tcp; int mountprog, mountvers, nfsprog, nfsvers; int retval; time_t t; time_t prevt; nfs_mount_version = find_kernel_nfs_mount_version(); retval = -1; msock = fsock = -1; mclient = NULL; if (strlen(spec) >= sizeof(hostdir)) { log_message("nfsmount: excessively long host:dir argument"); goto fail; } strcpy(hostdir, spec); if ((s = strchr(hostdir, ':'))) { hostname = hostdir; dirname = s + 1; *s = '\0'; } else { log_message("nfsmount: directory to mount not in host:dir format"); goto fail; } server_addr.sin_family = AF_INET; #ifdef HAVE_inet_aton if (!inet_aton(hostname, &server_addr.sin_addr)) #endif { if (mygethostbyname(hostname, &server_addr.sin_addr)) { log_message("nfsmount: can't get address for %s", hostname); goto fail; } } memcpy (&mount_server_addr, &server_addr, sizeof (mount_server_addr)); /* Set default options. * rsize/wsize are set to 8192 to enable nfs install on * old i586 machines * timeo is filled in after we know whether it'll be TCP or UDP. */ memset(&data, 0, sizeof(data)); data.rsize = 8192; data.wsize = 8192; data.retrans = 30; data.acregmin = 3; data.acregmax = 60; data.acdirmin = 30; data.acdirmax = 60; #if NFS_MOUNT_VERSION >= 2 data.namlen = NAME_MAX; #endif soft = 1; intr = 0; posix = 0; nocto = 0; nolock = 1; broken_suid = 0; noac = 0; tcp = 0; mountprog = MOUNTPROG; mountvers = 0; port = 0; mountport = 0; nfsprog = NFS_PROGRAM; nfsvers = 0; retry_mount: proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP; data.flags = (soft ? NFS_MOUNT_SOFT : 0) | (intr ? NFS_MOUNT_INTR : 0) | (posix ? NFS_MOUNT_POSIX : 0) | (nocto ? NFS_MOUNT_NOCTO : 0) | (noac ? NFS_MOUNT_NOAC : 0); #if NFS_MOUNT_VERSION >= 2 if (nfs_mount_version >= 2) data.flags |= (tcp ? NFS_MOUNT_TCP : 0); #endif #if NFS_MOUNT_VERSION >= 3 if (nfs_mount_version >= 3) data.flags |= (nolock ? NFS_MOUNT_NONLM : 0); #endif #if NFS_MOUNT_VERSION >= 4 if (nfs_mount_version >= 4) data.flags |= (broken_suid ? NFS_MOUNT_BROKEN_SUID : 0); #endif if (nfsvers > MAX_NFSPROT) { log_message("NFSv%d not supported!", nfsvers); return 0; } if (mountvers > MAX_NFSPROT) { log_message("NFSv%d not supported!", nfsvers); return 0; } if (nfsvers && !mountvers) mountvers = (nfsvers < 3) ? 1 : nfsvers; if (nfsvers && nfsvers < mountvers) mountvers = nfsvers; /* Adjust options if none specified */ if (!data.timeo) data.timeo = tcp ? 70 : 7; #ifdef NFS_MOUNT_DEBUG log_message("rsize = %d, wsize = %d, timeo = %d, retrans = %d", data.rsize, data.wsize, data.timeo, data.retrans); log_message("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)", data.acregmin, data.acregmax, data.acdirmin, data.acdirmax); log_message("port = %d, retry = %d, flags = %.8x", port, retry, data.flags); log_message("mountprog = %d, mountvers = %d, nfsprog = %d, nfsvers = %d", mountprog, mountvers, nfsprog, nfsvers); log_message("soft = %d, intr = %d, posix = %d, nocto = %d, noac = %d", (data.flags & NFS_MOUNT_SOFT) != 0, (data.flags & NFS_MOUNT_INTR) != 0, (data.flags & NFS_MOUNT_POSIX) != 0, (data.flags & NFS_MOUNT_NOCTO) != 0, (data.flags & NFS_MOUNT_NOAC) != 0); #if NFS_MOUNT_VERSION >= 2 log_message("tcp = %d", (data.flags & NFS_MOUNT_TCP) != 0); #endif #endif data.version = nfs_mount_version; *mount_opts = (char *) &data; /* create mount deamon client */ /* See if the nfs host = mount host. */ if (mounthost) { if (mounthost[0] >= '0' && mounthost[0] <= '9') { mount_server_addr.sin_family = AF_INET; mount_server_addr.sin_addr.s_addr = inet_addr(hostname); } else { if (mygethostbyname(mounthost, &mount_server_addr.sin_addr)) { log_message("nfsmount: can't get address for %s", mounthost); goto fail; } } } /* * The following loop implements the mount retries. On the first * call, "running_bg" is 0. When the mount times out, and the * "bg" option is set, the exit status EX_BG will be returned. * For a backgrounded mount, there will be a second call by the * child process with "running_bg" set to 1. * * The case where the mount point is not present and the "bg" * option is set, is treated as a timeout. This is done to * support nested mounts. * * The "retry" count specified by the user is the number of * minutes to retry before giving up. * * Only the first error message will be displayed. */ retry_timeout.tv_sec = 3; retry_timeout.tv_usec = 0; total_timeout.tv_sec = 20; total_timeout.tv_usec = 0; prevt = 0; t = 30; /* be careful not to use too many CPU cycles */ if (t - prevt < 30) sleep(30); pm_mnt = get_mountport(&mount_server_addr, mountprog, mountvers, proto, mountport, nfs_mount_version); /* contact the mount daemon via TCP */ mount_server_addr.sin_port = htons(pm_mnt->pm_port); msock = RPC_ANYSOCK; switch (pm_mnt->pm_prot) { case IPPROTO_UDP: mclient = clntudp_create(&mount_server_addr, pm_mnt->pm_prog, pm_mnt->pm_vers, retry_timeout, &msock); if (mclient) break; mount_server_addr.sin_port = htons(pm_mnt->pm_port); msock = RPC_ANYSOCK; case IPPROTO_TCP: mclient = clnttcp_create(&mount_server_addr, pm_mnt->pm_prog, pm_mnt->pm_vers, &msock, 0, 0); break; default: mclient = 0; } if (mclient) { /* try to mount hostname:dirname */ mclient->cl_auth = authunix_create_default(); /* make pointers in xdr_mountres3 NULL so * that xdr_array allocates memory for us */ memset(&status, 0, sizeof(status)); log_message("nfsmount: doing client call in nfs version: %ld", pm_mnt->pm_vers); if (pm_mnt->pm_vers == 3) clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT, (xdrproc_t) xdr_dirpath, (caddr_t) &dirname, (xdrproc_t) xdr_mountres3, (caddr_t) &status, total_timeout); else clnt_stat = clnt_call(mclient, MOUNTPROC_MNT, (xdrproc_t) xdr_dirpath, (caddr_t) &dirname, (xdrproc_t) xdr_fhstatus, (caddr_t) &status, total_timeout); if (clnt_stat == RPC_SUCCESS) goto succeeded; if (prevt == 0) log_message("could not call server: probably protocol or version error"); auth_destroy(mclient->cl_auth); clnt_destroy(mclient); mclient = 0; close(msock); } else { log_message("could not create rpc client: host probably not found or NFS server is down"); } prevt = t; goto fail; succeeded: nfsvers = (pm_mnt->pm_vers < 2) ? 2 : pm_mnt->pm_vers; if (nfsvers == 2) { if (status.nfsv2.fhs_status != 0) { log_message("nfsmount: %s:%s failed, reason given by server: %s", hostname, dirname, nfs_strerror(status.nfsv2.fhs_status)); goto fail; } memcpy(data.root.data, (char *) status.nfsv2.fhstatus_u.fhs_fhandle, NFS_FHSIZE); #if NFS_MOUNT_VERSION >= 4 data.root.size = NFS_FHSIZE; memcpy(data.old_root.data, (char *) status.nfsv2.fhstatus_u.fhs_fhandle, NFS_FHSIZE); #endif } else { #if NFS_MOUNT_VERSION >= 4 fhandle3 *fhandle; if (status.nfsv3.fhs_status != 0) { log_message("nfsmount: %s:%s failed, reason given by server: %s", hostname, dirname, nfs_strerror(status.nfsv3.fhs_status)); goto fail; } fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle; memset(data.old_root.data, 0, NFS_FHSIZE); memset(&data.root, 0, sizeof(data.root)); data.root.size = fhandle->fhandle3_len; memcpy(data.root.data, (char *) fhandle->fhandle3_val, fhandle->fhandle3_len); data.flags |= NFS_MOUNT_VER3; #endif } /* create nfs socket for kernel */ if (tcp) { if (nfs_mount_version < 3) { log_message("NFS over TCP is not supported."); goto fail; } fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); } else fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if (fsock < 0) { log_perror("nfs socket"); goto fail; } if (bindresvport(fsock, 0) < 0) { log_perror("nfs bindresvport"); goto fail; } if (port == 0) { server_addr.sin_port = PMAPPORT; port = pmap_getport(&server_addr, nfsprog, nfsvers, tcp ? IPPROTO_TCP : IPPROTO_UDP); #if 1 /* Here we check to see if user is mounting with the * tcp option. If so, and if the portmap returns a * '0' for port (service unavailable), we then notify * the user, and retry with udp. */ if (port == 0 && tcp == 1) { log_message("NFS server reported TCP not available, retrying with UDP..."); tcp = 0; goto retry_mount; } #endif if (port == 0) port = NFS_PORT; #ifdef NFS_MOUNT_DEBUG else log_message("used portmapper to find NFS port"); #endif } #ifdef NFS_MOUNT_DEBUG log_message("using port %d for nfs deamon", port); #endif server_addr.sin_port = htons(port); /* * connect() the socket for kernels 1.3.10 and below only, * to avoid problems with multihomed hosts. * --Swen */ if (linux_version_code() <= 66314 && connect(fsock, (struct sockaddr *) &server_addr, sizeof (server_addr)) < 0) { log_perror("nfs connect"); goto fail; } /* prepare data structure for kernel */ data.fd = fsock; memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr)); strncpy(data.hostname, hostname, sizeof(data.hostname)); /* clean up */ auth_destroy(mclient->cl_auth); clnt_destroy(mclient); close(msock); return 0; /* abort */ fail: if (msock != -1) { if (mclient) { auth_destroy(mclient->cl_auth); clnt_destroy(mclient); } close(msock); } if (fsock != -1) close(fsock); return retval; } /* * We need to translate between nfs status return values and * the local errno values which may not be the same. * * Andreas Schwab : change errno: * "after #include the symbol errno is reserved for any use, * it cannot even be used as a struct tag or field name". */ #ifndef EDQUOT #define EDQUOT ENOSPC #endif static struct { enum nfsstat stat; int errnum; } nfs_errtbl[] = { { NFS_OK, 0 }, { NFSERR_PERM, EPERM }, { NFSERR_NOENT, ENOENT }, { NFSERR_IO, EIO }, { NFSERR_NXIO, ENXIO }, { NFSERR_ACCES, EACCES }, { NFSERR_EXIST, EEXIST }, { NFSERR_NODEV, ENODEV }, { NFSERR_NOTDIR, ENOTDIR }, { NFSERR_ISDIR, EISDIR }, #ifdef NFSERR_INVAL { NFSERR_INVAL, EINVAL }, /* that Sun forgot */ #endif { NFSERR_FBIG, EFBIG }, { NFSERR_NOSPC, ENOSPC }, { NFSERR_ROFS, EROFS }, { NFSERR_NAMETOOLONG, ENAMETOOLONG }, { NFSERR_NOTEMPTY, ENOTEMPTY }, { NFSERR_DQUOT, EDQUOT }, { NFSERR_STALE, ESTALE }, #ifdef EWFLUSH { NFSERR_WFLUSH, EWFLUSH }, #endif /* Throw in some NFSv3 values for even more fun (HP returns these) */ { 71, EREMOTE }, { -1, EIO } }; static char *nfs_strerror(int stat) { int i; static char buf[256]; for (i = 0; nfs_errtbl[i].stat != (unsigned)-1; i++) { if (nfs_errtbl[i].stat == (unsigned)stat) return strerror(nfs_errtbl[i].errnum); } sprintf(buf, "unknown nfs status return value: %d", stat); return buf; }