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annotate rogue5/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 f502bf60e6e4
children
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33
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1 /*
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2 * Contains functions for dealing with things that happen in the
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3 * future.
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4 *
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5 * @(#)daemon.c 4.7 (Berkeley) 02/05/99
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6 *
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7 * Rogue: Exploring the Dungeons of Doom
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8 * Copyright (C) 1980-1983, 1985, 1999 Michael Toy, Ken Arnold and Glenn Wichman
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9 * All rights reserved.
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10 *
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11 * See the file LICENSE.TXT for full copyright and licensing information.
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12 */
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13
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14 #include <curses.h>
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15 #include "rogue.h"
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16
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17 #define DAEMON -1
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18
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19 /*
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20 * d_slot:
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21 * Find an empty slot in the daemon/fuse list
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22 */
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23 struct delayed_action *
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24 d_slot(void)
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25 {
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26 struct delayed_action *dev;
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27
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28 for (dev = d_list; dev <= &d_list[MAXDAEMONS-1]; dev++)
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29 if (dev->d_type == EMPTY)
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30 return dev;
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31 #ifdef MASTER
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32 debug("Ran out of fuse slots");
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33 #endif
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34 return NULL;
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35 }
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36
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37 /*
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38 * find_slot:
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39 * Find a particular slot in the table
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40 */
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41 struct delayed_action *
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42 find_slot(void (*func)())
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43 {
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44 struct delayed_action *dev;
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45
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46 for (dev = d_list; dev <= &d_list[MAXDAEMONS-1]; dev++)
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47 if (dev->d_type != EMPTY && func == dev->d_func)
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48 return dev;
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49 return NULL;
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50 }
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51
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52 /*
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53 * start_daemon:
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54 * Start a daemon, takes a function.
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55 */
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56 void
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57 start_daemon(void (*func)(), int arg, int type)
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58 {
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59 struct delayed_action *dev;
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60
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61 dev = d_slot();
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62 dev->d_type = type;
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63 dev->d_func = func;
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64 dev->d_arg = arg;
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65 dev->d_time = DAEMON;
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66 }
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67
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68 /*
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69 * kill_daemon:
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70 * Remove a daemon from the list
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71 */
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72 void
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73 kill_daemon(void (*func)())
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74 {
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75 struct delayed_action *dev;
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76
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77 if ((dev = find_slot(func)) == NULL)
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78 return;
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79 /*
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80 * Take it out of the list
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81 */
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82 dev->d_type = EMPTY;
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83 }
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84
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85 /*
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86 * do_daemons:
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87 * Run all the daemons that are active with the current flag,
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88 * passing the argument to the function.
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89 */
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90 void
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91 do_daemons(int flag)
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92 {
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93 struct delayed_action *dev;
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94
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95 /*
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96 * Loop through the devil list
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97 */
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98 for (dev = d_list; dev <= &d_list[MAXDAEMONS-1]; dev++)
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99 /*
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100 * Executing each one, giving it the proper arguments
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101 */
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102 if (dev->d_type == flag && dev->d_time == DAEMON)
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103 (*dev->d_func)(dev->d_arg);
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104 }
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105
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106 /*
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107 * fuse:
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