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cfe9424ba9
The forbidden() function only checks if we are trying to remove one of the . .. or / directories that are forbidden by POSIX, and it should not fail when it cannot stat a target, because that check is done later considering if -r, -f and -i were used or not. If the stat fails we can be sure that is not / and thus it is not a forbidden target.
88 lines
1.4 KiB
C
88 lines
1.4 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <fcntl.h>
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#include <string.h>
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#include "fs.h"
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#include "util.h"
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static void
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usage(void)
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{
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eprintf("usage: %s [-f] [-iRr] file ...\n", argv0);
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}
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static int
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forbidden(char *path, struct stat *root)
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{
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char *s, *t;
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size_t n;
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struct stat st;
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static int w1, w2;
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n = strlen(path);
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for (t = path + n; t > path && t[-1] == '/'; --t)
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;
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for (s = t; s > path && s[-1] != '/'; --s)
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;
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n = t - s;
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if (n == 1 && *s == '.' || n == 2 && s[0] == '.' && s[1] == '.') {
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if (!w1)
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weprintf("\".\" and \"..\" may not be removed\n");
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w1 = 1;
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return 1;
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}
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if (stat(path, &st) < 0)
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return 0;
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if (st.st_dev == root->st_dev && st.st_ino == root->st_ino) {
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if (!w2)
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weprintf("\"/\" may not be removed\n");
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w2 = 1;
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return 1;
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}
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return 0;
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}
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int
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main(int argc, char *argv[])
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{
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char *s;
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struct stat st;
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struct recursor r = { .fn = rm, .maxdepth = 1, .follow = 'P' };
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ARGBEGIN {
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case 'f':
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r.flags |= SILENT | IGNORE;
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break;
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case 'i':
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r.flags |= CONFIRM;
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break;
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case 'R':
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case 'r':
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r.maxdepth = 0;
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break;
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default:
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usage();
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} ARGEND
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if (!argc) {
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if (!(r.flags & IGNORE))
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usage();
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else
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return 0;
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}
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if (stat("/", &st) < 0)
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eprintf("stat root:");
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for (; *argv; argc--, argv++) {
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if (forbidden(*argv, &st)) {
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rm_status = 1;
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continue;
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}
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recurse(AT_FDCWD, *argv, NULL, &r);
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}
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return rm_status || recurse_status;
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}
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