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/* ls.c
integrit - file integrity verification system
Copyright (C) 2000, 2001, 2002 Ed L. Cashin
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
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; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
/* support platforms that don't yet conform to C99 */
#if HAVE_STDINT_H
#include <stdint.h>
#elif HAVE_INTTYPES_H
#include <inttypes.h>
#else
#error No stdint.h or inttypes.h found.
#endif
#include "gnupg/sha1.h"
#include "elcerror_p.h"
#include "elcerror.h"
#include "dbinfo.h"
#include "xstradd.h"
#include "show.h"
#ifdef ELC_FIND_LEAKS
#include "leakfind.h"
#endif
#undef PROGNAME
#define PROGNAME "i-ls"
typedef struct options {
char *targetname;
unsigned checksums: 1;
} options;
/* based on (but simplified from) function by the same name in eachfile.c */
static void do_checksum(const char *filename, dbinfo *dbinf)
{
SHA1_CONTEXT context;
char buf[BUFSIZ];
int n;
int fd = open(filename, O_RDONLY);
if (fd == -1) {
/* just zero out the checksum on errors (usually permission denied) */
memset(dbinf->sum, 0, sizeof(dbinf->sum));
return;
}
sha1_init(&context);
while ( (n = read(fd, buf, BUFSIZ)) )
sha1_write(&context, buf, n);
close(fd);
sha1_final(&context);
/* It is faster but slightly dirtier to use context.buf directly.
*/
/* memcpy(dbinf->sum, sha1_read(&context), SHA1_DIGEST_LENGTH); */
memcpy(dbinf->sum, context.buf, SHA1_DIGEST_LENGTH);
}
/* over-optimized version of (! strcmp(filename, "..")) */
inline static int is_self_or_parent(const char *filename)
{
const char *p;
if (! filename)
return 0;
p = filename;
if (*p && (*p++ == '.')) {
if (! *p)
return 1; /* "." */
if ((*p++ == '.') && (! *p))
return 1; /* ".." */
}
return 0;
}
void ls_directory(options *opts, dbinfo *dbinf_buf, const char *dirname)
{
DIR *d = opendir(dirname);
struct dirent *entry;
char *filename;
char *fullpath = NULL;
int doing_sum;
if (! d)
die(__FUNCTION__, "Error: opening directory (%s): %s",
dirname, strerror(errno));
while ( (entry = readdir(d)) ) {
filename = entry->d_name;
if (is_self_or_parent(filename))
continue;
if (fullpath)
free(fullpath);
fullpath = xstradd(dirname, "/", filename, NULL);
if (lstat(fullpath, &dbinf_buf->stat) == -1)
die(__FUNCTION__, "Error: could not lstat file (%s): %s",
fullpath, strerror(errno));
if (opts->checksums) {
if ( (doing_sum = S_ISREG(dbinf_buf->stat.st_mode)) )
do_checksum(fullpath, dbinf_buf);
} else {
doing_sum = 0;
}
show_entry(opts->checksums, fullpath, strlen(fullpath), dbinf_buf,
doing_sum ? sizeof(*dbinf_buf) : sizeof(dbinf_buf->stat));
}
if (fullpath)
free(fullpath);
closedir(d);
}
void ls(options *opts)
{
dbinfo dbinf;
char *target = opts->targetname;
int doing_sum = 0;
if (lstat(target, &dbinf.stat) == -1)
die(__FUNCTION__, "Error: could not lstat file (%s): %s",
target, strerror(errno));
/* did lstat first so we know whether it's a regular file */
if (opts->checksums && (S_ISREG(dbinf.stat.st_mode))) {
doing_sum = 1;
do_checksum(target, &dbinf);
}
show_entry(opts->checksums, target, strlen(target),
&dbinf, doing_sum ? sizeof(dbinf) : sizeof(dbinf.stat));
if (S_ISDIR(dbinf.stat.st_mode))
ls_directory(opts, &dbinf, target); /* reuse dbinf in ls_directory */
}
void usage(void)
{
fputs("Usage:\n " PROGNAME " [-s] [filename] [filename ...]\n"
" " PROGNAME " -h\n"
"Options:\n"
" -s don't show checksums\n"
" -h display this usage summary\n"
,
stderr);
}
int main(int argc, char *argv[])
{
options opts = { NULL, 1 };
int i;
for (i = 1; i < argc; ++i) {
if (! strcmp(argv[i], "-h")) {
usage();
exit(EXIT_SUCCESS);
} else if (! strcmp(argv[i], "-s")) { /* handle the checksums option */
opts.checksums = 0;
} else {
opts.targetname = argv[i];
ls(&opts);
}
}
#ifdef ELC_FIND_LEAKS
GC_gcollect(); /* find the leaks before exiting */
#endif
return 0;
}
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