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/*
integrit - file integrity verification system
Copyright (C) 2006 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.
*/
/*
* Looks like struct dirent's on my Linux box always have DT_UNKNOWN
* as their d_type member:
*
* if (result)
* printf("type: %d %s DT_UNKNOWN\t",
* result->d_type, (result->d_type == DT_UNKNOWN) ? "==" : "!=");
*
* ... as the docs say they might.
*/
/* This file tree walker silently ignores files that vanish between the
* time the readdir is done and the time the lstat is done.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include "xstrdup.h"
#include "xstradd.h"
#include "elcwft.h"
#include "elcwft_p.h"
#include "elcerror.h"
#include "elcerror_p.h"
#ifdef ELC_FIND_LEAKS
#include "leakfind.h"
#endif
typedef struct wftnode { /* walk file tree node */
DIR *dir;
struct wftnode *next;
} wftnode;
inline static int is_directory(const char *path, struct stat *sb)
{
if (lstat(path, sb) == -1)
return -1;
return S_ISDIR(sb->st_mode);
}
inline static wftnode *endoflist(wftnode *head)
{
wftnode *np;
for (np = head; np->next; np = np->next)
if (np->next && (! np->next->dir)) {
/* clean up used node */
free(np->next);
np->next = NULL;
break;
}
return np;
}
inline static int backupdir(char *dirname)
{
char *lastslash = strrchr(dirname, '/');
if (! lastslash) {
errno = EINVAL;
return -1;
}
*lastslash = '\0';
return 0;
}
/* the function below is tied to the internal workings of
* walk_file_tree, and it helps make the big loop in walk_file_tree
* more readable/managable. */
inline static int finishdir(wftnode *np, wftnode *head,
int *done, char *curr_dirname)
{
if (np == head) {
*done = 1;
closedir(np->dir);
return 0;
}
closedir(np->dir);
np->dir = NULL; /* signal to endoflist that we're done here */
if (backupdir(curr_dirname) == -1)
return -1;
return 0;
}
/* the old parameters were:
* const char *rootname, wft_cb_t callback, void *cbdata */
int walk_file_tree(wft_context_t *ctx)
{
DIR *root = opendir(ctx->rootname);
wftnode dirs;
wftnode *np;
char *curr_dirname = xstrdup(ctx->rootname);
char *path = NULL;
struct dirent *result;
struct stat statbuf;
int ret, cb_ret;
int done = 0;
int err = 0;
dirs.dir = root;
dirs.next = NULL;
if (! root)
return WFT_ERROR;
while (! done) {
/* find the deepest directory and maintain list */
np = endoflist(&dirs);
/* while we don't want to go deeper into file tree */
while (! np->next) {
result = readdir(np->dir);
if (!result) {
/* no more entries in this dir */
if (finishdir(np, &dirs, &done, curr_dirname) == -1)
return WFT_ERROR;
break;
}
if (!strcmp(result->d_name, ".") || !strcmp(result->d_name, "..")) {
/* skip the current and parent dir */
continue;
}
if (path)
free(path);
path = xstradd(curr_dirname, "/", result->d_name, NULL);
if ((ret = is_directory(path, &statbuf)) == -1) {
if (errno == ENOENT) /* no such file or directory */
continue; /* silently skip the vanished file */
else
return WFT_ERROR;
}
cb_ret = ctx->callback(path, &statbuf, ctx->cb_data);
switch (cb_ret) {
case WFT_ERROR:
if (ctx->options & WFT_STOP_ON_ERR)
return WFT_ERROR;
err = 1;
case WFT_PRUNE:
continue;
}
if (ret == 1) { /* directory */
if (! (np->next = malloc(sizeof(* np->next))) )
return WFT_ERROR;
if (! (np->next->dir = opendir(path)) ) {
warn(__FUNCTION__, "Warning: cannot open directory (%s): %s",
path, strerror(errno));
if (ctx->options & WFT_STOP_ON_ERR)
return WFT_ERROR;
err = 1;
continue;
}
free(curr_dirname);
curr_dirname = xstrdup(path);
np->next->next = NULL;
}
} /* end iterating through a given dir */
} /* end while not done */
if (path)
free(path);
free(curr_dirname);
return (err? WFT_SOME_ERR: WFT_PROCEED);
}
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