557 lines
14 KiB
C
557 lines
14 KiB
C
/*
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* nfsmount.c -- Linux NFS mount
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* Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
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* numbers to be specified on the command line.
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*
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* Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
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* Omit the call to connect() for Linux version 1.3.11 or later.
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*/
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/*
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* nfsmount.c,v 1.1.1.1 1993/11/18 08:40:51 jrs Exp
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <netdb.h>
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#include <rpc/rpc.h>
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#include <rpc/pmap_prot.h>
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#include <rpc/pmap_clnt.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/utsname.h>
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#include <arpa/inet.h>
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#include "sundries.h"
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#include "nfsmount.h"
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#if defined(__GLIBC__)
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#define _LINUX_SOCKET_H
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#endif /* __GLIBC__ */
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#define _I386_BITOPS_H
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#include <linux/fs.h>
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#include <linux/nfs.h>
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#include "nfs_mount3.h"
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static char *nfs_strerror(int stat);
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#define MAKE_VERSION(p,q,r) (65536*(p) + 256*(q) + (r))
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static int
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linux_version_code(void) {
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struct utsname my_utsname;
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int p, q, r;
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if (uname(&my_utsname) == 0) {
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p = atoi(strtok(my_utsname.release, "."));
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q = atoi(strtok(NULL, "."));
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r = atoi(strtok(NULL, "."));
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return MAKE_VERSION(p,q,r);
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}
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return 0;
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}
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/*
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* nfs_mount_version according to the kernel sources seen at compile time.
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*/
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static int nfs_mount_version = KERNEL_NFS_MOUNT_VERSION;
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/*
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* Unfortunately, the kernel prints annoying console messages
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* in case of an unexpected nfs mount version (instead of
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* just returning some error). Therefore we'll have to try
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* and figure out what version the kernel expects.
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*
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* Variables:
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* KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
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* NFS_MOUNT_VERSION: these nfsmount sources at compile time
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* nfs_mount_version: version this source and running kernel can handle
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*/
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static void
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find_kernel_nfs_mount_version(void) {
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int kernel_version = linux_version_code();
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if (kernel_version) {
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if (kernel_version < MAKE_VERSION(2,1,32))
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nfs_mount_version = 1;
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else
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nfs_mount_version = 3;
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}
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if (nfs_mount_version > NFS_MOUNT_VERSION)
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nfs_mount_version = NFS_MOUNT_VERSION;
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}
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int nfsmount(const char *spec, const char *node, int *flags,
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char **extra_opts, char **mount_opts)
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{
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char hostdir[1024];
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CLIENT *mclient;
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char *hostname;
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char *dirname;
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char *old_opts;
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char *mounthost=NULL;
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char new_opts[1024];
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fhandle root_fhandle;
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struct timeval total_timeout;
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enum clnt_stat clnt_stat;
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static struct nfs_mount_data data;
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char *opt, *opteq;
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int val;
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struct hostent *hp;
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struct sockaddr_in server_addr;
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struct sockaddr_in mount_server_addr;
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int msock, fsock;
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struct timeval pertry_timeout;
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struct fhstatus status;
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char *s;
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int port;
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int mountport;
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int bg;
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int soft;
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int intr;
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int posix;
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int nocto;
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int noac;
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int nolock;
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int retry;
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int tcp;
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int mountprog;
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int mountvers;
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int nfsprog;
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int nfsvers;
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find_kernel_nfs_mount_version();
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msock = fsock = -1;
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mclient = NULL;
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if (strlen(spec) >= sizeof(hostdir)) {
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fprintf(stderr, "mount: "
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"excessively long host:dir argument\n");
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goto fail;
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}
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strcpy(hostdir, spec);
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if ((s = (strchr(hostdir, ':')))) {
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hostname = hostdir;
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dirname = s + 1;
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*s = '\0';
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}
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else {
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fprintf(stderr, "mount: "
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"directory to mount not in host:dir format\n");
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goto fail;
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}
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server_addr.sin_family = AF_INET;
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if (!inet_aton(hostname, &server_addr.sin_addr)) {
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if ((hp = gethostbyname(hostname)) == NULL) {
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fprintf(stderr, "mount: can't get address for %s\n",
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hostname);
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goto fail;
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} else
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memcpy(&server_addr.sin_addr, hp->h_addr, hp->h_length);
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}
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memcpy (&mount_server_addr, &server_addr, sizeof (mount_server_addr));
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/* add IP address to mtab options for use when unmounting */
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s = inet_ntoa(server_addr.sin_addr);
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old_opts = *extra_opts;
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if (!old_opts)
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old_opts = "";
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if (strlen(old_opts) + strlen(s) + 10 >= sizeof(new_opts)) {
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fprintf(stderr, "mount: "
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"excessively long option argument\n");
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goto fail;
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}
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sprintf(new_opts, "%s%saddr=%s",
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old_opts, *old_opts ? "," : "", s);
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*extra_opts = xstrdup(new_opts);
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/* Set default options.
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* rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
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* let the kernel decide.
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* timeo is filled in after we know whether it'll be TCP or UDP. */
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memset(&data, 0, sizeof(data));
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data.retrans = 3;
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data.acregmin = 3;
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data.acregmax = 60;
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data.acdirmin = 30;
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data.acdirmax = 60;
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#if NFS_MOUNT_VERSION >= 2
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data.namlen = NAME_MAX;
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#endif
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bg = 0;
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soft = 0;
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intr = 0;
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posix = 0;
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nocto = 0;
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nolock = 0;
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noac = 0;
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retry = 10000;
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tcp = 0;
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mountprog = MOUNTPROG;
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mountvers = MOUNTVERS;
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port = 0;
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mountport = 0;
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nfsprog = NFS_PROGRAM;
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nfsvers = NFS_VERSION;
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/* parse options */
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for (opt = strtok(old_opts, ","); opt; opt = strtok(NULL, ",")) {
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if ((opteq = strchr(opt, '='))) {
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val = atoi(opteq + 1);
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*opteq = '\0';
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if (!strcmp(opt, "rsize"))
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data.rsize = val;
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else if (!strcmp(opt, "wsize"))
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data.wsize = val;
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else if (!strcmp(opt, "timeo"))
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data.timeo = val;
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else if (!strcmp(opt, "retrans"))
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data.retrans = val;
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else if (!strcmp(opt, "acregmin"))
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data.acregmin = val;
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else if (!strcmp(opt, "acregmax"))
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data.acregmax = val;
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else if (!strcmp(opt, "acdirmin"))
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data.acdirmin = val;
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else if (!strcmp(opt, "acdirmax"))
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data.acdirmax = val;
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else if (!strcmp(opt, "actimeo")) {
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data.acregmin = val;
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data.acregmax = val;
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data.acdirmin = val;
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data.acdirmax = val;
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}
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else if (!strcmp(opt, "retry"))
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retry = val;
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else if (!strcmp(opt, "port"))
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port = val;
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else if (!strcmp(opt, "mountport"))
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mountport = val;
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else if (!strcmp(opt, "mounthost"))
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mounthost=xstrndup(opteq+1,
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strcspn(opteq+1," \t\n\r,"));
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else if (!strcmp(opt, "mountprog"))
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mountprog = val;
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else if (!strcmp(opt, "mountvers"))
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mountvers = val;
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else if (!strcmp(opt, "nfsprog"))
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nfsprog = val;
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else if (!strcmp(opt, "nfsvers"))
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nfsvers = val;
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else if (!strcmp(opt, "namlen")) {
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#if NFS_MOUNT_VERSION >= 2
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if (nfs_mount_version >= 2)
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data.namlen = val;
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else
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#endif
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printf("Warning: Option namlen is not supported.\n");
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}
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else if (!strcmp(opt, "addr"))
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/* ignore */;
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else {
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printf("unknown nfs mount parameter: "
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"%s=%d\n", opt, val);
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goto fail;
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}
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}
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else {
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val = 1;
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if (!strncmp(opt, "no", 2)) {
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val = 0;
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opt += 2;
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}
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if (!strcmp(opt, "bg"))
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bg = val;
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else if (!strcmp(opt, "fg"))
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bg = !val;
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else if (!strcmp(opt, "soft"))
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soft = val;
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else if (!strcmp(opt, "hard"))
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soft = !val;
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else if (!strcmp(opt, "intr"))
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intr = val;
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else if (!strcmp(opt, "posix"))
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posix = val;
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else if (!strcmp(opt, "cto"))
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nocto = !val;
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else if (!strcmp(opt, "ac"))
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noac = !val;
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else if (!strcmp(opt, "tcp"))
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tcp = val;
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else if (!strcmp(opt, "udp"))
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tcp = !val;
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else if (!strcmp(opt, "lock")) {
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if (nfs_mount_version >= 3)
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nolock = !val;
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else
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printf("Warning: option nolock is not supported.\n");
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} else {
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printf("unknown nfs mount option: "
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"%s%s\n", val ? "" : "no", opt);
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goto fail;
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}
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}
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}
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data.flags = (soft ? NFS_MOUNT_SOFT : 0)
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| (intr ? NFS_MOUNT_INTR : 0)
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| (posix ? NFS_MOUNT_POSIX : 0)
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| (nocto ? NFS_MOUNT_NOCTO : 0)
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| (noac ? NFS_MOUNT_NOAC : 0);
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#if NFS_MOUNT_VERSION >= 2
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if (nfs_mount_version >= 2)
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data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
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#endif
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#if NFS_MOUNT_VERSION >= 3
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if (nfs_mount_version >= 3)
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data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
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#endif
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/* Adjust options if none specified */
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if (!data.timeo)
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data.timeo = tcp ? 70 : 7;
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#ifdef NFS_MOUNT_DEBUG
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printf("rsize = %d, wsize = %d, timeo = %d, retrans = %d\n",
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data.rsize, data.wsize, data.timeo, data.retrans);
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printf("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)\n",
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data.acregmin, data.acregmax, data.acdirmin, data.acdirmax);
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printf("port = %d, bg = %d, retry = %d, flags = %.8x\n",
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port, bg, retry, data.flags);
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printf("mountprog = %d, mountvers = %d, nfsprog = %d, nfsvers = %d\n",
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mountprog, mountvers, nfsprog, nfsvers);
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printf("soft = %d, intr = %d, posix = %d, nocto = %d, noac = %d\n",
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(data.flags & NFS_MOUNT_SOFT) != 0,
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(data.flags & NFS_MOUNT_INTR) != 0,
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(data.flags & NFS_MOUNT_POSIX) != 0,
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(data.flags & NFS_MOUNT_NOCTO) != 0,
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(data.flags & NFS_MOUNT_NOAC) != 0);
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#if NFS_MOUNT_VERSION >= 2
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printf("tcp = %d\n",
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(data.flags & NFS_MOUNT_TCP) != 0);
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#endif
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#if 0
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goto fail;
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#endif
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#endif
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data.version = nfs_mount_version;
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*mount_opts = (char *) &data;
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if (*flags & MS_REMOUNT)
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return 0;
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/* create mount deamon client */
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/* See if the nfs host = mount host. */
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if (mounthost) {
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if (mounthost[0] >= '0' && mounthost[0] <= '9') {
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mount_server_addr.sin_family = AF_INET;
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mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
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}
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else if ((hp = gethostbyname(mounthost)) == NULL) {
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fprintf(stderr, "mount: can't get address for %s\n", hostname);
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goto fail;
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}
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else {
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mount_server_addr.sin_family = AF_INET;
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memcpy(&mount_server_addr.sin_addr, hp->h_addr, hp->h_length);
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}
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}
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mount_server_addr.sin_port = htons(mountport);
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msock = RPC_ANYSOCK;
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if ((mclient = clnttcp_create(&mount_server_addr,
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mountprog, mountvers, &msock, 0, 0)) == NULL) {
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mount_server_addr.sin_port = htons(mountport);
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msock = RPC_ANYSOCK;
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pertry_timeout.tv_sec = 3;
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pertry_timeout.tv_usec = 0;
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if ((mclient = clntudp_create(&mount_server_addr,
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mountprog, mountvers, pertry_timeout, &msock)) == NULL) {
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clnt_pcreateerror("mount clntudp_create");
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goto fail;
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}
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#ifdef NFS_MOUNT_DEBUG
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printf("using UDP for mount deamon\n");
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#endif
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}
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#ifdef NFS_MOUNT_DEBUG
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else
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printf("using TCP for mount deamon\n");
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#endif
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mclient->cl_auth = authunix_create_default();
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total_timeout.tv_sec = 20;
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total_timeout.tv_usec = 0;
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/* try to mount hostname:dirname */
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clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
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(xdrproc_t) xdr_dirpath, &dirname,
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(xdrproc_t) xdr_fhstatus, &status,
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total_timeout);
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if (clnt_stat != RPC_SUCCESS) {
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clnt_perror(mclient, "rpc mount");
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goto fail;
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}
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if (status.fhs_status != 0) {
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fprintf(stderr,
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"mount: %s:%s failed, reason given by server: %s\n",
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hostname, dirname, nfs_strerror(status.fhs_status));
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goto fail;
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}
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memcpy((char *) &root_fhandle, (char *) status.fhstatus_u.fhs_fhandle,
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sizeof (root_fhandle));
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/* create nfs socket for kernel */
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if (tcp) {
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if (nfs_mount_version < 3) {
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printf("NFS over TCP is not supported.\n");
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goto fail;
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}
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fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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} else
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fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (fsock < 0) {
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perror("nfs socket");
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goto fail;
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}
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if (bindresvport(fsock, 0) < 0) {
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perror("nfs bindresvport");
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goto fail;
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}
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if (port == 0) {
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server_addr.sin_port = PMAPPORT;
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port = pmap_getport(&server_addr, nfsprog, nfsvers,
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tcp ? IPPROTO_TCP : IPPROTO_UDP);
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if (port == 0)
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port = NFS_PORT;
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#ifdef NFS_MOUNT_DEBUG
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else
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printf("used portmapper to find NFS port\n");
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#endif
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}
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#ifdef NFS_MOUNT_DEBUG
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printf("using port %d for nfs deamon\n", port);
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#endif
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server_addr.sin_port = htons(port);
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/*
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* connect() the socket for kernels 1.3.10 and below only,
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* to avoid problems with multihomed hosts.
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* --Swen
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*/
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if (linux_version_code() <= 66314
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&& connect(fsock, (struct sockaddr *) &server_addr,
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sizeof (server_addr)) < 0) {
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perror("nfs connect");
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goto fail;
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}
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/* prepare data structure for kernel */
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data.fd = fsock;
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memcpy((char *) &data.root, (char *) &root_fhandle,
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sizeof (root_fhandle));
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memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
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strncpy(data.hostname, hostname, sizeof(data.hostname));
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/* clean up */
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auth_destroy(mclient->cl_auth);
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clnt_destroy(mclient);
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close(msock);
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return 0;
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/* abort */
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fail:
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if (msock != -1) {
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auth_destroy(mclient->cl_auth);
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clnt_destroy(mclient);
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close(msock);
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}
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if (fsock != -1)
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close(fsock);
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return 1;
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}
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/*
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* We need to translate between nfs status return values and
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* the local errno values which may not be the same.
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*
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* Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
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* "after #include <errno.h> the symbol errno is reserved for any use,
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* it cannot even be used as a struct tag or field name".
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*/
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#ifndef EDQUOT
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#define EDQUOT ENOSPC
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#endif
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static struct {
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enum nfs_stat stat;
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int errnum;
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} nfs_errtbl[] = {
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{ NFS_OK, 0 },
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{ NFSERR_PERM, EPERM },
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{ NFSERR_NOENT, ENOENT },
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{ NFSERR_IO, EIO },
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{ NFSERR_NXIO, ENXIO },
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{ NFSERR_ACCES, EACCES },
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{ NFSERR_EXIST, EEXIST },
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{ NFSERR_NODEV, ENODEV },
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{ NFSERR_NOTDIR, ENOTDIR },
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{ NFSERR_ISDIR, EISDIR },
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#ifdef NFSERR_INVAL
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{ NFSERR_INVAL, EINVAL }, /* that Sun forgot */
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#endif
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{ NFSERR_FBIG, EFBIG },
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{ NFSERR_NOSPC, ENOSPC },
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{ NFSERR_ROFS, EROFS },
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{ NFSERR_NAMETOOLONG, ENAMETOOLONG },
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{ NFSERR_NOTEMPTY, ENOTEMPTY },
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{ NFSERR_DQUOT, EDQUOT },
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{ NFSERR_STALE, ESTALE },
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#ifdef EWFLUSH
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{ NFSERR_WFLUSH, EWFLUSH },
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#endif
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/* Throw in some NFSv3 values for even more fun (HP returns these) */
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{ 71, EREMOTE },
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{ -1, EIO }
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};
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static char *nfs_strerror(int stat)
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{
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int i;
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static char buf[256];
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for (i = 0; nfs_errtbl[i].stat != -1; i++) {
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if (nfs_errtbl[i].stat == stat)
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return strerror(nfs_errtbl[i].errnum);
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}
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sprintf(buf, "unknown nfs status return value: %d", stat);
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return buf;
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}
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