93fd817536
It has become a common idiom in sbase to check strlcat() and strlcpy()
using
if (strl{cat, cpy}(dst, src, siz) >= siz)
eprintf("path too long\n");
However, this was not carried out consistently and to this very day,
some tools employed unchecked calls to these functions, effectively
allowing silent truncations to happen, which in turn may lead to
security issues.
To finally put an end to this, the e*-functions detect truncation
automatically and the caller can lean back and enjoy coding without
trouble. :)
87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <dirent.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "../fs.h"
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#include "../util.h"
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int recurse_status = 0;
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void
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recurse(const char *path, void *data, struct recursor *r)
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{
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struct dirent *d;
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struct history *new, *h;
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struct stat st, dst;
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DIR *dp;
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int (*statf)(const char *, struct stat *);
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char subpath[PATH_MAX], *statf_name;
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if (r->follow == 'P' || (r->follow == 'H' && r->depth)) {
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statf_name = "lstat";
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statf = lstat;
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} else {
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statf_name = "stat";
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statf = stat;
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}
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if (statf(path, &st) < 0) {
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if (errno != ENOENT) {
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weprintf("%s %s:", statf_name, path);
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recurse_status = 1;
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}
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return;
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}
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if (!S_ISDIR(st.st_mode))
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return;
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new = emalloc(sizeof(struct history));
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new->prev = r->hist;
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r->hist = new;
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new->dev = st.st_dev;
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new->ino = st.st_ino;
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for (h = new->prev; h; h = h->prev)
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if (h->dev == st.st_dev && h->ino == st.st_ino)
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return;
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if (!(dp = opendir(path))) {
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weprintf("opendir %s:", path);
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recurse_status = 1;
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return;
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}
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while ((d = readdir(dp))) {
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if (r->follow == 'H') {
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statf_name = "lstat";
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statf = lstat;
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}
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if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
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continue;
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estrlcpy(subpath, path, sizeof(subpath));
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if (path[strlen(path) - 1] != '/')
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estrlcat(subpath, "/", sizeof(subpath));
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estrlcat(subpath, d->d_name, sizeof(subpath));
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if ((r->flags & SAMEDEV) && statf(subpath, &dst) < 0) {
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if (errno != ENOENT) {
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weprintf("%s %s:", statf_name, subpath);
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recurse_status = 1;
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}
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} else if (!((r->flags & SAMEDEV) && dst.st_dev != st.st_dev)) {
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r->depth++;
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(r->fn)(subpath, data, r);
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r->depth--;
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}
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}
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closedir(dp);
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}
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