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
  42
  43         f = fopen("/proc/net/rpc/nfsd.export/channel", "w");
  44         if (f == NULL) return -1;
  45         qword_print(f, exp->ex_client);
  46         qword_print(f, exp->ex_path);
  47         if (export) {
  48                 qword_printint(f, 0x7fffffff);
  49                 qword_printint(f, exp->ex_flags);
  50                 qword_printint(f, exp->ex_anon_uid);
  51                 qword_printint(f, exp->ex_anon_gid);
  52                 qword_printint(f, exp->ex_dev);
  53         } else
  54                 qword_printint(f, 1);
  55
  56         qword_eol(f);
  57         fclose(f);
  58
  59         if (stat(exp->ex_path, &stb) != 0)
  60                 return -1;
  61         f = fopen("/proc/net/rpc/nfsd.fh/channel", "w");
  62         if (f==NULL) return -1;
  63         if (exp->ex_flags & NFSEXP_FSID) {
  64                 qword_print(f,exp->ex_client);
  65                 qword_printint(f,1);
  66                 fsid = exp->ex_dev;
  67                 qword_printhex(f, (char*)&fsid, 4);
  68                 if (export) {
  69                         qword_printint(f, 0x7fffffff);
  70                         qword_print(f, exp->ex_path);
  71                 } else
  72                         qword_printint(f, 1);
  73
  74                 qword_eol(f);
  75         }
  76         qword_print(f,exp->ex_client);
  77         qword_printint(f,0);
  78         dev = htons(major(stb.st_dev)); memcpy(fsidstr, &dev, 2);
  79         dev = htons(minor(stb.st_dev)); memcpy(fsidstr+2, &dev, 2);
  80         inode = stb.st_ino; memcpy(fsidstr+4, &inode, 4);
  81
  82         qword_printhex(f, fsidstr, 8);
  83         if (export) {
  84                 qword_printint(f, 0x7fffffff);
  85                 qword_print(f, exp->ex_path);
  86         } else
  87                 qword_printint(f, 1);
  88         qword_eol(f);
  89         fclose(f);
  90         return 0;
  91 }
  92
  93 int
  94 nfsexport(struct nfsctl_export *exp)
  95 {
  96         struct nfsctl_arg       arg;
  97         int fd;
  98         if ((fd=open("/proc/net/rpc/nfsd.fh/channel", O_WRONLY))>= 0) {
  99                 close(fd);
 100                 return exp_unexp(exp, 1);
 101         }
 102         arg.ca_version = NFSCTL_VERSION;
 103         memcpy(&arg.ca_export, exp, sizeof(arg.ca_export));
 104         return nfsctl(NFSCTL_EXPORT, &arg, NULL);
 105 }
 106
 107 int
 108 nfsunexport(struct nfsctl_export *exp)
 109 {
 110         struct nfsctl_arg       arg;
 111
 112         int fd;
 113         if ((fd=open("/proc/net/rpc/nfsd.fh/channel", O_WRONLY))>= 0) {
 114                 close(fd);
 115                 return exp_unexp(exp, 0);
 116         }
 117
 118         arg.ca_version = NFSCTL_VERSION;
 119         memcpy(&arg.ca_export, exp, sizeof(arg.ca_export));
 120         return nfsctl(NFSCTL_UNEXPORT, &arg, NULL);
 121 }