/* MODIFIED for Red Hat Linux installer * msw@redhat.com * o always mounts without lockd * o uses our own host resolution */ /* * 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. */ /* * nfsmount.c,v 1.1.1.1 1993/11/18 08:40:51 jrs Exp */ /* hack hack to prevent linux/in.h from being included */ #define _LINUX_IN_H #include #include #include #include #include #include #include #include #include #include #include #include #include #include "sundries.h" #include "nfsmount.h" #define NFS_NEED_KERNEL_TYPES #include #include "mount_constants.h" #include "nfs_mount4.h" #undef NFS_NEED_KERNEL_TYPES #include "dns.h" static char *nfs_strerror(int stat); #define MAKE_VERSION(p,q,r) (65536*(p) + 256*(q) + (r)) #define ERROR_CONNECT -50 #define ERROR_HOSTNAME -51 static int myerror = 0; /* from sundries.c */ /* Fatal error. Print message and exit. */ void die (int err, const char *fmt, ...) { va_list args; va_start (args, fmt); vfprintf (stderr, fmt, args); fprintf (stderr, "\n"); va_end (args); #if 0 unlock_mtab (); #endif exit (err); } char * nfsxstrdup (const char *s) { char *t; if (s == NULL) return NULL; t = strdup (s); if (t == NULL) die (EX_SYSERR, "not enough memory"); return t; } char * xstrndup (const char *s, int n) { char *t; if (s == NULL) die (EX_SOFTWARE, "bug in xstrndup call"); t = malloc(n+1); strncpy(t,s,n); t[n] = 0; return t; } void * nfsxmalloc(size_t size) { void *ptr = malloc(size); if (!ptr) { error("Out of memory"); exit(1); } return ptr; } /* end of sundries.c */ #ifdef HAVE_NFSV3 #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2) #else #define MAX_NFSPROT 2 #endif 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; } /* * nfs_mount_version according to the kernel sources seen at compile time. */ static int nfs_mount_version = KERNEL_NFS_MOUNT_VERSION; /* * 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: * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time * NFS_MOUNT_VERSION: these nfsmount sources at compile time * nfs_mount_version: version this source and running kernel can handle */ static void find_kernel_nfs_mount_version(void) { int kernel_version = linux_version_code(); if (kernel_version) { if (kernel_version < MAKE_VERSION(2,1,32)) nfs_mount_version = 1; #ifdef HAVE_NFSV3 else if (kernel_version < MAKE_VERSION(2,2,7)) nfs_mount_version = 3; else nfs_mount_version = 4; #else else nfs_mount_version = 3; #endif } #if 0 if (nfs_mount_version > NFS_MOUNT_VERSION) nfs_mount_version = NFS_MOUNT_VERSION; #endif } static struct pmap * get_mountport(struct sockaddr_in *server_addr, long unsigned prog, long unsigned version, long unsigned proto, long unsigned port) { struct pmaplist *pmap; static struct pmap p = {0, 0, 0, 0}; server_addr->sin_port = PMAPPORT; pmap = pmap_getmaps(server_addr); if (!pmap) return NULL; 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; 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(const char *spec, const char *node, int *flags, char **extra_opts, char **mount_opts, int running_bg) { static char *prev_bg_host; char hostdir[1024]; CLIENT *mclient; char *hostname; char *dirname; char *old_opts; char *mounthost=NULL; char new_opts[1024]; struct timeval total_timeout; enum clnt_stat clnt_stat; static struct nfs_mount_data data; char *opt, *opteq; int val; 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; struct stat statbuf; char *s; int port; int mountport; int proto; int bg; int soft; int intr; int posix; int nocto; int noac; int nolock; int retry; int tcp; int mountprog; int mountvers; int nfsprog; int nfsvers; int retval; time_t t; time_t prevt; time_t timeout; find_kernel_nfs_mount_version(); myerror = 0; retval = EX_FAIL; msock = fsock = -1; mclient = NULL; if (strlen(spec) >= sizeof(hostdir)) { goto fail; } strcpy(hostdir, spec); if ((s = (strchr(hostdir, ':')))) { hostname = hostdir; dirname = s + 1; *s = '\0'; } else { goto fail; } server_addr.sin_family = AF_INET; #if 1 /* old libc's do not have inet_aton() -- change 1 to 0 */ if (!inet_aton(hostname, &server_addr.sin_addr)) #endif { if (mygethostbyname(hostname, &server_addr.sin_addr)) { myerror = ERROR_HOSTNAME; goto fail; } else { server_addr.sin_family = AF_INET; } } memcpy (&mount_server_addr, &server_addr, sizeof (mount_server_addr)); /* add IP address to mtab options for use when unmounting */ s = inet_ntoa(server_addr.sin_addr); old_opts = *extra_opts; if (!old_opts) old_opts = ""; if (strlen(old_opts) + strlen(s) + 10 >= sizeof(new_opts)) { goto fail; } sprintf(new_opts, "%s%saddr=%s", old_opts, *old_opts ? "," : "", s); *extra_opts = nfsxstrdup(new_opts); /* Set default options. * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to * let the kernel decide. * timeo is filled in after we know whether it'll be TCP or UDP. */ memset(&data, 0, sizeof(data)); data.retrans = 3; data.acregmin = 3; data.acregmax = 60; data.acdirmin = 30; data.acdirmax = 60; #if NFS_MOUNT_VERSION >= 2 data.namlen = NAME_MAX; #endif bg = 0; soft = 0; intr = 0; posix = 0; nocto = 0; nolock = 0; noac = 0; retry = 10000; /* 10000 minutes ~ 1 week */ tcp = 0; mountprog = MOUNTPROG; mountvers = 0; port = 0; mountport = 0; nfsprog = NFS_PROGRAM; nfsvers = 0; /* parse options */ for (opt = strtok(old_opts, ","); opt; opt = strtok(NULL, ",")) { if ((opteq = strchr(opt, '='))) { val = atoi(opteq + 1); *opteq = '\0'; if (!strcmp(opt, "rsize")) data.rsize = val; else if (!strcmp(opt, "wsize")) data.wsize = val; else if (!strcmp(opt, "timeo")) data.timeo = val; else if (!strcmp(opt, "retrans")) data.retrans = val; else if (!strcmp(opt, "acregmin")) data.acregmin = val; else if (!strcmp(opt, "acregmax")) data.acregmax = val; else if (!strcmp(opt, "acdirmin")) data.acdirmin = val; else if (!strcmp(opt, "acdirmax")) data.acdirmax = val; else if (!strcmp(opt, "actimeo")) { data.acregmin = val; data.acregmax = val; data.acdirmin = val; data.acdirmax = val; } else if (!strcmp(opt, "retry")) retry = val; else if (!strcmp(opt, "port")) port = val; else if (!strcmp(opt, "mountport")) mountport = val; else if (!strcmp(opt, "mounthost")) mounthost=xstrndup(opteq+1, strcspn(opteq+1," \t\n\r,")); else if (!strcmp(opt, "mountprog")) mountprog = val; else if (!strcmp(opt, "mountvers")) mountvers = val; else if (!strcmp(opt, "nfsprog")) nfsprog = val; else if (!strcmp(opt, "nfsvers")) nfsvers = val; else if (!strcmp(opt, "namlen")) { #if NFS_MOUNT_VERSION >= 2 if (nfs_mount_version >= 2) data.namlen = val; else #endif printf("Warning: Option namlen is not supported.\n"); } else if (!strcmp(opt, "addr")) /* ignore */; else { printf("unknown nfs mount parameter: " "%s=%d\n", opt, val); goto fail; } } else { val = 1; if (!strncmp(opt, "no", 2)) { val = 0; opt += 2; } if (!strcmp(opt, "bg")) bg = val; else if (!strcmp(opt, "fg")) bg = !val; else if (!strcmp(opt, "soft")) soft = val; else if (!strcmp(opt, "hard")) soft = !val; else if (!strcmp(opt, "intr")) intr = val; else if (!strcmp(opt, "posix")) posix = val; else if (!strcmp(opt, "cto")) nocto = !val; else if (!strcmp(opt, "ac")) noac = !val; else if (!strcmp(opt, "tcp")) tcp = val; else if (!strcmp(opt, "udp")) tcp = !val; else if (!strcmp(opt, "lock")) { if (nfs_mount_version >= 3) nolock = !val; else printf("Warning: option nolock is not supported.\n"); } else { #if 0 if (!sloppy) { #endif printf("unknown nfs mount option: " "%s%s\n", val ? "" : "no", opt); goto fail; #if 0 } #endif } } } 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 |= NFS_MOUNT_NONLM; /* HACK HACK msw */ #endif /* Adjust options if none specified */ if (!data.timeo) data.timeo = tcp ? 70 : 7; #ifdef NFS_MOUNT_DEBUG printf("rsize = %d, wsize = %d, timeo = %d, retrans = %d\n", data.rsize, data.wsize, data.timeo, data.retrans); printf("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)\n", data.acregmin, data.acregmax, data.acdirmin, data.acdirmax); printf("port = %d, bg = %d, retry = %d, flags = %.8x\n", port, bg, retry, data.flags); printf("mountprog = %d, mountvers = %d, nfsprog = %d, nfsvers = %d\n", mountprog, mountvers, nfsprog, nfsvers); printf("soft = %d, intr = %d, posix = %d, nocto = %d, noac = %d\n", (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 printf("tcp = %d\n", (data.flags & NFS_MOUNT_TCP) != 0); #endif #endif if (nfsvers > MAX_NFSPROT) { fprintf(stderr, "NFSv%d not supported!\n", nfsvers); return 0; } if (mountvers > MAX_NFSPROT) { fprintf(stderr, "NFSv%d not supported!\n", nfsvers); return 0; } if (nfsvers && !mountvers) mountvers = (nfsvers < 3) ? 1 : nfsvers; if (nfsvers && nfsvers < mountvers) { mountvers = nfsvers; } data.version = nfs_mount_version; *mount_opts = (char *) &data; if (*flags & MS_REMOUNT) return 0; /* * If the previous mount operation on the same host was * backgrounded, and the "bg" for this mount is also set, * give up immediately, to avoid the initial timeout. */ if (bg && !running_bg && prev_bg_host && strcmp(hostname, prev_bg_host) == 0) { if (retry > 0) retval = EX_BG; return retval; } /* 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(hostname, &mount_server_addr.sin_addr)) { myerror = ERROR_HOSTNAME; goto fail; } else { mount_server_addr.sin_family = AF_INET; } } } /* * 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; timeout = time(NULL) + 60 * retry; prevt = 0; t = 30; val = 1; for (;;) { if (bg && stat(node, &statbuf) == -1) { if (running_bg) { sleep(val); /* 1, 2, 4, 8, 16, 30, ... */ val *= 2; if (val > 30) val = 30; } } else { /* 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); if (pm_mnt == NULL) { fprintf(stderr, "mount: cannot access portmapper on %s: %s\n", hostname, strerror (errno)); goto fail; } /* 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)); 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) break; /* we're done */ if (errno != ECONNREFUSED) { clnt_perror(mclient, "mount"); goto fail; /* don't retry */ } if (!running_bg && prevt == 0) clnt_perror(mclient, "mount"); auth_destroy(mclient->cl_auth); clnt_destroy(mclient); mclient = 0; close(msock); } else { if (!running_bg && prevt == 0) clnt_pcreateerror("mount"); } prevt = t; } if (!bg) { myerror = ERROR_CONNECT; goto fail; } if (!running_bg) { prev_bg_host = nfsxstrdup(hostname); if (retry > 0) retval = EX_BG; goto fail; } t = time(NULL); if (t >= timeout) goto fail; } nfsvers = (pm_mnt->pm_vers < 2) ? 2 : pm_mnt->pm_vers; if (nfsvers == 2) { if (status.nfsv2.fhs_status != 0) { myerror = 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) { myerror = 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) { printf("NFS over TCP is not supported.\n"); goto fail; } fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); } else fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if (fsock < 0) { perror("nfs socket"); goto fail; } if (bindresvport(fsock, 0) < 0) { 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 (port == 0) port = NFS_PORT; #ifdef NFS_MOUNT_DEBUG else printf("used portmapper to find NFS port\n"); #endif } #ifdef NFS_MOUNT_DEBUG printf("using port %d for nfs deamon\n", 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) { 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 nfs_stat 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 }, }; char *nfs_error(void) { static char * host = "Unable to resolve hostname"; static char * connect = "Unable to connect to server"; if (myerror == 0) return strerror(0); if (myerror == ERROR_CONNECT) return connect; if (myerror == ERROR_HOSTNAME) return host; return nfs_strerror(myerror); } static char *nfs_strerror(int stat) { int i; static char buf[256]; for (i = 0; nfs_errtbl[i].stat != -1; i++) { if (nfs_errtbl[i].stat == stat) return strerror(nfs_errtbl[i].errnum); } sprintf(buf, "unknown nfs status return value: %d", stat); return buf; } #if 0 int my_getport(struct in_addr server, struct timeval *timeo, ...) { struct sockaddr_in sin; struct pmap pmap; CLIENT *clnt; int sock = RPC_ANYSOCK, port; pmap.pm_prog = prog; pmap.pm_vers = vers; pmap.pm_prot = prot; pmap.pm_port = 0; sin.sin_family = AF_INET; sin.sin_addr = server; sin.sin_port = htons(111); clnt = clntudp_create(&sin, 100000, 2, *timeo, &sock); status = clnt_call(clnt, PMAP_GETPORT, &pmap, (xdrproc_t) xdr_pmap, &port, (xdrproc_t) xdr_uint); if (status != SUCCESS) { /* natter */ port = 0; } clnt_destroy(clnt); close(sock); return port; } #endif