FreeCalypso > hg > freecalypso-tools

annotate rvinterf/etmsync/fspath.c @ 921:74d284add54d

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fc-fsio: guard against bogus readdir results from the target If the FFS being operated on contains SE K2x0 extended filenames, readdir will return strings that are bad for printing. We need to guard against this possibility, and also against possible other bogosity that could be sent by other alien firmwares.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 31 Dec 2022 22:55:23 +0000
parents e7502631a0f9
children
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1 /*
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2 * FFS pathname manipulation functions
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3 */
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4
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5 #include <sys/types.h>
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include "ffs.h"
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11 #include "limits.h"
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12 #include "ffslimits.h"
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13 #include "exitcodes.h"
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14
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15 validate_ffs_pathname(cand)
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16 char *cand;
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17 {
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18 char *cp;
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19 int depth, c;
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20
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21 cp = cand;
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22 if (*cp++ != '/') {
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23 fprintf(stderr, "error: FFS pathnames must be absolute\n");
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24 return(-1);
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25 }
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26 for (depth = 0; *cp; depth++) {
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27 if (*cp == '/') {
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28 fprintf(stderr,
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29 "error: FFS pathname must not contain duplicate slashes\n");
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30 return(-1);
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31 }
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32 for (c = 0; *cp && *cp != '/'; cp++)
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33 c++;
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34 if (c > MAX_FN_COMPONENT) {
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35 fprintf(stderr,
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36 "error: FFS pathname component is too long\n");
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37 return(-1);
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38 }
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39 if (!*cp)
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40 continue;
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41 cp++;
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42 if (!*cp) {
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43 fprintf(stderr,
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44 "error: FFS pathname must not end with a trailing slash\n");
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45 return(-1);
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46 }
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47 }
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48 if (depth > MAX_NAME_DEPTH) {
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49 fprintf(stderr, "error: FFS pathname exceeds depth limit\n");
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50 return(-1);
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51 }
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52 return(depth);
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53 }
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54
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55 char *
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56 pathname_for_ffs_child(parent, childbuf)
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57 char *parent, *childbuf;
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58 {
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59 int depth;
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60 char *cp;
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61
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62 depth = validate_ffs_pathname(parent);
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63 if (depth < 0 || depth >= MAX_NAME_DEPTH)
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64 return(0);
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65 strcpy(childbuf, parent);
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66 cp = index(childbuf, '\0');
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67 if (depth)
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68 *cp++ = '/';
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69 return(cp);
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70 }