support/nfs/nfsexport.c

   1 /*
   2  * support/nfs/export.c
   3  *
   4  * Add or delete an NFS export in knfsd.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #ifdef HAVE_CONFIG_H
  10 #include <config.h>
  11 #endif
  12
  13 #include <string.h>
  14 #include <sys/types.h>
  15 #include <asm/types.h>
  16 #include <sys/stat.h>
  17 #include <unistd.h>
  18 #include <fcntl.h>
  19
  20 #include "nfslib.h"
  21
  22         /* if /proc/net/rpc/... exists, then
  23          * write to it, as that interface is more stable.
  24          * Write:
  25          *  client fsidtype fsid path
  26          * to /proc/net/rpc/nfsd.fh/channel
  27          * and
  28          *  client path expiry flags anonuid anongid fsid
  29          * to /proc/net/rpc/nfsd.export/channel
  30          */
  31
  32 static int
  33 exp_unexp(struct nfsctl_export *exp, int export)
  34 {
  35         FILE *f;
  36         struct stat stb;
  37         __u32 fsid;
  38         char fsidstr[8];
  39         __u16 dev;
  40         __u32 inode;
  41         int err;
  42
  43
  44         f = fopen("/proc/net/rpc/nfsd.export/channel", "w");
  45         if (f == NULL) return -1;
  46         qword_print(f, exp->ex_client);
  47         qword_print(f, exp->ex_path);
  48         if (export) {
  49                 qword_printint(f, 0x7fffffff);
  50                 qword_printint(f, exp->ex_flags);
  51                 qword_printint(f, exp->ex_anon_uid);
  52                 qword_printint(f, exp->ex_anon_gid);
  53                 qword_printint(f, exp->ex_dev);
  54         } else
  55                 qword_printint(f, 1);
  56
  57         err = qword_eol(f);
  58         fclose(f);
  59
  60         if (stat(exp->ex_path, &stb) != 0)
  61                 return -1;
  62         f = fopen("/proc/net/rpc/nfsd.fh/channel", "w");
  63         if (f==NULL) return -1;
  64         if (exp->ex_flags & NFSEXP_FSID) {
  65                 qword_print(f,exp->ex_client);
  66                 qword_printint(f,1);
  67                 fsid = exp->ex_dev;
  68                 qword_printhex(f, (char*)&fsid, 4);
  69                 if (export) {
  70                         qword_printint(f, 0x7fffffff);
  71                         qword_print(f, exp->ex_path);
  72                 } else
  73                         qword_printint(f, 1);
  74
  75                 err = qword_eol(f) || err;
  76         }
  77         qword_print(f,exp->ex_client);
  78         qword_printint(f,0);
  79         dev = htons(major(stb.st_dev)); memcpy(fsidstr, &dev, 2);
  80         dev = htons(minor(stb.st_dev)); memcpy(fsidstr+2, &dev, 2);
  81         inode = stb.st_ino; memcpy(fsidstr+4, &inode, 4);
  82
  83         qword_printhex(f, fsidstr, 8);
  84         if (export) {
  85                 qword_printint(f, 0x7fffffff);
  86                 qword_print(f, exp->ex_path);
  87         } else
  88                 qword_printint(f, 1);
  89         err = qword_eol(f) || err;
  90         fclose(f);
  91         return err;
  92 }
  93
  94 int
  95 nfsexport(struct nfsctl_export *exp)
  96 {
  97         struct nfsctl_arg       arg;
  98         int fd;
  99         if ((fd=open("/proc/net/rpc/nfsd.fh/channel", O_WRONLY))>= 0) {
 100                 close(fd);
 101                 return exp_unexp(exp, 1);
 102         }
 103         arg.ca_version = NFSCTL_VERSION;
 104         memcpy(&arg.ca_export, exp, sizeof(arg.ca_export));
 105         return nfsctl(NFSCTL_EXPORT, &arg, NULL);
 106 }
 107
 108 int
 109 nfsunexport(struct nfsctl_export *exp)
 110 {
 111         struct nfsctl_arg       arg;
 112
 113         int fd;
 114         if ((fd=open("/proc/net/rpc/nfsd.fh/channel", O_WRONLY))>= 0) {
 115                 close(fd);
 116                 return exp_unexp(exp, 0);
 117         }
 118
 119         arg.ca_version = NFSCTL_VERSION;
 120         memcpy(&arg.ca_export, exp, sizeof(arg.ca_export));
 121         return nfsctl(NFSCTL_UNEXPORT, &arg, NULL);
 122 }