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annotate xrogue/daemon.c @ 176:db1c9a21a7c3

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srogue: prevent overflowing the score file name. If SCOREFILE is not defined, roguehome() is called to find a directory for the score file. It copies up to PATH_MAX-20 bytes from an environment variable to a static buffer. Later these are strcpy()'d to scorefile, which is of size LINLEN. Unfortunately LINLEN is 80 and PATH_MAX is at least 256. On Linux, it happens to be 4096. I haven't yet managed to crash or exploit it, but there are surely no beneficial consequences, so roguehome() has been modified to check the length, and the string it returns is also checked in main().
author John "Elwin" Edwards
date Sun, 02 Aug 2015 12:14:47 -0400
parents cadff8f047a1
children f54901b9c39b
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1 /*
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2 daemon.c - functions for dealing with things that happen in the future
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3
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4 XRogue: Expeditions into the Dungeons of Doom
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5 Copyright (C) 1991 Robert Pietkivitch
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6 All rights reserved.
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7
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8 Based on "Advanced Rogue"
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9 Copyright (C) 1984, 1985 Michael Morgan, Ken Dalka and AT&T
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10 All rights reserved.
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11
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12 Based on "Rogue: Exploring the Dungeons of Doom"
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13 Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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14 All rights reserved.
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15
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16 See the file LICENSE.TXT for full copyright and licensing information.
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17 */
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18
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19 #include <curses.h>
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20 #include "rogue.h"
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21
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22 #define EMPTY 0
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23 #define DAEMON -1
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24
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25 #define _X_ { EMPTY }
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26
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27 struct delayed_action d_list[MAXDAEMONS] = {
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28 _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_
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29 };
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30 struct delayed_action f_list[MAXFUSES] = {
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31 _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_,
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32 _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_
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33 };
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34
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35 int demoncnt = 0; /* number of active daemons */
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36 int fusecnt = 0;
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37
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38
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39 /*
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40 * d_slot:
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41 * Find an empty slot in the daemon list
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42 */
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43 struct delayed_action *
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44 d_slot()
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45 {
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46 reg int i;
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47 reg struct delayed_action *dev;
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48
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49 for (i = 0, dev = d_list; i < MAXDAEMONS; i++, dev++)
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50 if (dev->d_type == EMPTY)
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51 return dev;
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52 return NULL;
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53 }
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54
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55 /*
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56 * f_slot:
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57 * Find an empty slot in the fuses list
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58 */
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59 struct delayed_action *
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60 f_slot()
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61 {
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62 reg int i;
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63 reg struct delayed_action *dev;
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64
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65 for (i = 0, dev = f_list; i < MAXFUSES; i++, dev++)
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66 if (dev->d_type == EMPTY)
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67 return dev;
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68 return NULL;
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69 }
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70
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71 /*
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72 * find_slot:
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73 * Find a particular slot in the table
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74 */
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75
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76 struct delayed_action *
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77 find_slot(func)
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78 reg int (*func)();
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79 {
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80 reg int i;
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81 reg struct delayed_action *dev;
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82
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83 for (i = 0, dev = f_list; i < MAXFUSES; i++, dev++)
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84 if (dev->d_type != EMPTY && func == dev->d_func)
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85 return dev;
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86 return NULL;
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87 }
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88
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89 /*
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90 * start_daemon:
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91 * Start a daemon, takes a function.
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92 */
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