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annotate rogue4/io.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 9535a08ddc39
children 1b73a8641b37
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12
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1 /*
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2 * Various input/output functions
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3 *
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4 * @(#)io.c 4.13 (Berkeley) 2/25/82
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5 *
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6 * Rogue: Exploring the Dungeons of Doom
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7 * Copyright (C) 1980, 1981, 1982 Michael Toy, Ken Arnold and Glenn Wichman
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8 * All rights reserved.
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9 *
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10 * See the file LICENSE.TXT for full copyright and licensing information.
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11 */
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12
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13 #include <curses.h>
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14 #include <ctype.h>
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15 #include <string.h>
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16 #include "rogue.h"
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17 #include <stdarg.h>
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18
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19 /*
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20 * msg:
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21 * Display a message at the top of the screen.
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22 */
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23 static char msgbuf[BUFSIZ];
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24 static int newpos = 0;
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25
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26 msg(char *fmt, ...)
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27 {
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28 va_list ap;
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29 /*
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30 * if the string is "", just clear the line
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31 */
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32 if (*fmt == '\0')
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33 {
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34 move(0, 0);
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35 clrtoeol();
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36 mpos = 0;
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37 return;
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38 }
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39 /*
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40 * otherwise add to the message and flush it out
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41 */
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42 va_start(ap,fmt);
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43 doadd(fmt, ap);
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44 va_end(ap);
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45 endmsg();
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46 }
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47
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48 /*
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49 * addmsg:
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50 * Add things to the current message
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51 */
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52
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53 addmsg(char *fmt, ...)
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54 {
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55 va_list ap;
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56
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57 va_start(ap, fmt);
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58 doadd(fmt, ap);
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59 va_end(ap);
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60 }
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61
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62 /*
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63 * endmsg:
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64 * Display a new msg (giving him a chance to see the previous one
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65 * if it is up there with the --More--)
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66 */
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67
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68 endmsg()
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69 {
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70 if (save_msg)
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71 {
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72 strncpy(huh, msgbuf, 80);
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73 huh[79] = 0;
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74 }
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75
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76 if (mpos)
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77 {
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78 look(FALSE);
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79 move(0, mpos);
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80 addstr("--More--");
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81 refresh();
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82 wait_for(' ');
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83 }
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84 /*
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85 * All messages should start with uppercase, except ones that
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86 * start with a pack addressing character
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87 */
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88 if (islower(msgbuf[0]) && msgbuf[1] != ')')
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89 msgbuf[0] = toupper(msgbuf[0]);
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90 mvaddstr(0, 0, msgbuf);
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91 clrtoeol();
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92 mpos = newpos;
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93 newpos = 0;
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94 refresh();
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95 }
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96
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97 /*
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98 * doadd:
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99 * Perform an add onto the message buffer
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100 */
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101
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102 doadd(char *fmt, va_list ap)
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103 {
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104 vsprintf(&msgbuf[newpos], fmt, ap);
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105 newpos = strlen(msgbuf);
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106 }
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107
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