98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
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/*
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* linux/fs/nfsd/nfs4recover.c
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*
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* Copyright (c) 2004 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Andy Adamson <andros@citi.umich.edu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/sunrpc/svc.h>
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#include <linux/nfsd/nfsd.h>
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#include <linux/nfs4.h>
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#include <linux/nfsd/state.h>
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#include <linux/nfsd/xdr4.h>
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#include <asm/uaccess.h>
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#include <asm/scatterlist.h>
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#include <linux/crypto.h>
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#define NFSDDBG_FACILITY NFSDDBG_PROC
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static void
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md5_to_hex(char *out, char *md5)
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{
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int i;
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for (i=0; i<16; i++) {
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unsigned char c = md5[i];
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*out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
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*out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
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}
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*out = '\0';
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}
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int
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nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname)
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{
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struct xdr_netobj cksum;
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struct crypto_tfm *tfm;
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struct scatterlist sg[1];
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int status = nfserr_resource;
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dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
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clname->len, clname->data);
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tfm = crypto_alloc_tfm("md5", 0);
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if (tfm == NULL)
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goto out;
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cksum.len = crypto_tfm_alg_digestsize(tfm);
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cksum.data = kmalloc(cksum.len, GFP_KERNEL);
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if (cksum.data == NULL)
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goto out;
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crypto_digest_init(tfm);
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sg[0].page = virt_to_page(clname->data);
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sg[0].offset = offset_in_page(clname->data);
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sg[0].length = clname->len;
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crypto_digest_update(tfm, sg, 1);
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crypto_digest_final(tfm, cksum.data);
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md5_to_hex(dname, cksum.data);
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kfree(cksum.data);
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status = nfs_ok;
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out:
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if (tfm)
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crypto_free_tfm(tfm);
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return status;
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}
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