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clearsign.c
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clearsign.c
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/*
* Copyright (c) 2018 SUSE LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING); if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*
***************************************************************/
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "inc.h"
int
clearsign(int fd, char *filename, char *outfilename, HASH_CONTEXT *ctx, const char *hname, int isfilter, int force, FILE **foutp)
{
byte *cbuf;
int l, cbufl;
int have = 0;
int i, j;
int nl = 0;
int first = 1;
FILE *fout;
cbufl = 8192;
cbuf = doalloc(cbufl);
l = read(fd, cbuf, cbufl);
if (l < 0)
dodie_errno("read");
if (l >= 34 && !strncmp((char *)cbuf, "-----BEGIN PGP SIGNED MESSAGE-----", 34))
return 0; /* already signed */
for (i = 0; i < l; i++)
{
if (cbuf[i] >= 32 || cbuf[i] == '\t' || cbuf[i] == '\r' || cbuf[i] == '\n')
continue;
first++;
}
if (first > 4 && !force)
{
fprintf(stderr, "%s: won't clearsign binaries\n", filename);
exit(1);
}
opensocket();
if (isfilter)
fout = stdout;
else if ((fout = fopen(outfilename, "w")) == 0)
dodie_errno(outfilename);
fprintf(fout, "-----BEGIN PGP SIGNED MESSAGE-----\nHash: %s\n\n", hname);
while (first || (l = read(fd, cbuf + have, cbufl - have)) > 0 || (l == 0 && have))
{
first = 0;
if (nl)
hash_write(ctx, (const unsigned char *)"\r\n", 2);
nl = 0;
l += have;
for (i = 0; i < l; i++)
if (cbuf[i] == '\n')
break;
if (i == l && i == cbufl && l != have)
{
cbufl *= 2;
cbuf = dorealloc(cbuf, cbufl);
have = l;
continue;
}
if ((l > 0 && cbuf[0] == '-') || (l > 4 && !strncmp((char *)cbuf, "From ", 5)))
fprintf(fout, "- ");
if (i == l)
{
/* EOF reached, line is unterminated */
cbuf[l] = '\n';
l++;
}
if (i > 20000)
dodie("line too long for clearsign");
fwrite(cbuf, 1, i + 1, fout);
for (j = i - 1; j >= 0; j--)
if (cbuf[j] != '\r' && cbuf[j] != ' ' && cbuf[j] != '\t')
break;
if (j >= 0)
hash_write(ctx, cbuf, j + 1);
nl = 1;
i++;
if (i < l)
memmove(cbuf, cbuf + i, l - i);
have = l - i;
}
if (l < 0)
{
perror("read");
if (!isfilter)
unlink(outfilename);
exit(1);
}
free(cbuf);
*foutp = fout;
return 1;
}