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annotate srogue/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 d6b7c3fb37ea
children 94a0d9dd5ce1
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36
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1 /*
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2 * Contains functions for dealing with things that
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3 * happen in the future.
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4 *
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5 * @(#)daemon.c 9.0 (rdk) 7/17/84
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6 *
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7 * Super-Rogue
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8 * Copyright (C) 1984 Robert D. Kindelberger
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9 * All rights reserved.
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10 *
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11 * Based on "Rogue: Exploring the Dungeons of Doom"
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12 * Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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13 * All rights reserved.
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14 *
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15 * See the file LICENSE.TXT for full copyright and licensing information.
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16 */
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17
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18 #include "rogue.h"
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19 #include "rogue.ext"
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20
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21 #define EMPTY 0
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22 #define DAEMON -1
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23
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24 #define _X_ { 0, 0, 0, 0 }
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25
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26 struct delayed_action d_list[MAXDAEMONS] = {
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27 _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_,
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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
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31
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32 /*
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33 * d_insert:
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34 * Insert a function in the daemon list.
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35 */
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36 struct delayed_action *
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37 d_insert(func, arg, type, time)
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38 int arg, type, time, (*func)();
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39 {
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40 reg struct delayed_action *dev;
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41
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42 if (demoncnt < MAXDAEMONS) {
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43 dev = &d_list[demoncnt];
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44 dev->d_type = type;
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45 dev->d_time = time;
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46 dev->d_func = func;
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47 dev->d_arg = arg;
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48 demoncnt += 1;
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49 return dev;
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50 }
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51 return NULL;
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52 }
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53
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54 d_delete(wire)
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55 struct delayed_action *wire;
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56 {
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57 reg struct delayed_action *d1, *d2;
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58
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59 for (d1 = d_list; d1 < &d_list[demoncnt]; d1++) {
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60 if (wire == d1) {
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61 for (d2 = d1 + 1; d2 < &d_list[demoncnt]; d2++)
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62 *d1++ = *d2;
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63 demoncnt -= 1;
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64 d1 = &d_list[demoncnt];
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65 d1->d_type = EMPTY;
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66 d1->d_func = EMPTY;
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67 return;
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68 }
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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 struct delayed_action *
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76 find_slot(func)
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77 int (*func)();
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78 {
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79 reg struct delayed_action *dev;
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80
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81 for (dev = d_list; dev < &d_list[demoncnt]; dev++)
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82 if (dev->d_type != EMPTY && func == dev->d_func)
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83 return dev;
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84 return NULL;
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85 }
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86
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87 /*
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88 * start_daemon:
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89 * Start a daemon, takes a function.
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90 */
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91 start_daemon(func, arg, type)
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92 int arg, type, (*func)();
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93 {
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94 d_insert(func, arg, type, DAEMON);
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95 }
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96
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97 /*
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98 * do_daemons:
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99 * Run all the daemons that are active with the current
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100 * flag, passing the argument to the function.
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101 */
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102 do_daemons(flag)
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103 int flag;
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104 {
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105 reg struct delayed_action *dev;