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