mirror of https://github.com/rd235/cado
98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
/*
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* scado: setuid in capability sauce.
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* Copyright (C) 2016 Davide Berardi and Renzo Davoli, University of Bologna
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*
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* This file is part of cado.
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*
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* Cado is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) 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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* You should have received a copy of the GNU General Public License
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* along with this program; If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <compute_digest.h>
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#define BUFSIZE 1024
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/* compute the hash digest for file whose descriptor is infd.
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if outfd >= 0 copy the contents to the file whose descriptor is outfd.
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the return value is the size of the file (or a negative value in case of error).
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the size of ascii_digest must be at least DIGESTSTRLEN + 1*/
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static ssize_t fcompute_digest(int infd, int outfd, char *ascii_digest) {
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char buf[BUFSIZE];
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unsigned char binary_digest[DIGESTLEN];
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MHASH td;
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ssize_t n;
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ssize_t rv = 0;
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td = mhash_init(DIGESTTYPE);
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while ((n=read(infd,buf,BUFSIZE)) > 0) {
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mhash(td, buf, n);
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if (outfd >= 0) {
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if (write(outfd, buf, n) < 0) {
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n = -1;
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break;
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}
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}
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rv += n;
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}
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mhash_deinit(td, binary_digest);
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if (n >= 0) {
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int i;
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for (i = 0; i < DIGESTLEN; i++, ascii_digest += 2)
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sprintf(ascii_digest, "%.2x", binary_digest[i]);
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*ascii_digest = 0;
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}
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return (n < 0) ? n : rv;
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}
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/* compute the hash digest of the file (the first arg is the pathname) */
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ssize_t compute_digest(const char *path, char *digest) {
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int fd=open(path, O_RDONLY);
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if (fd >= 0) {
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ssize_t rv = fcompute_digest(fd, -1, digest);
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close(fd);
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return rv;
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} else
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return -1;
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}
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/* compute the hash digest of the file (the first arg is the pathname)
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while copying it in a temporary file. The second arg is a template for tmp files
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as explained in mkstemp(3)
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*/
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ssize_t copytemp_digest(const char *inpath, char *outtemplate, char *digest) {
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int infd=open(inpath, O_RDONLY);
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int outfd;
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mode_t oldmask;
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ssize_t rv;
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if (infd < 0)
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return -1;
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oldmask = umask(027);
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outfd = mkstemp(outtemplate);
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umask(oldmask);
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if (outfd < 0)
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return -1;
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rv = fcompute_digest(infd, outfd, digest);
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close(infd);
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close(outfd);
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return rv;
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}
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