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annotate rogue5/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 f502bf60e6e4
children
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33
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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 4.32 (Berkeley) 02/05/99
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5 */
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6
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7 #include <stdarg.h>
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8 #include <curses.h>
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9 #include <ctype.h>
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10 #include <string.h>
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11 #include "rogue.h"
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12
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13 /*
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14 * msg:
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15 * Display a message at the top of the screen.
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16 */
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17 #define MAXMSG (NUMCOLS - sizeof "--More--")
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18
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19 static char msgbuf[2*MAXMSG+1];
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20 static int newpos = 0;
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21
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22 /* VARARGS1 */
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23 int
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24 msg(const char *fmt, ...)
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25 {
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26 va_list args;
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27
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28 /*
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29 * if the string is "", just clear the line
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30 */
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31 if (*fmt == '\0')
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32 {
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33 move(0, 0);
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34 clrtoeol();
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35 mpos = 0;
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36 return ~ESCAPE;
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37 }
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38 /*
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39 * otherwise add to the message and flush it out
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40 */
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41 va_start(args, fmt);
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42 doadd(fmt, args);
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43 va_end(args);
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44 return endmsg();
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45 }
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46
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47 /*
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48 * addmsg:
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49 * Add things to the current message
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50 */
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51 /* VARARGS1 */
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52 void
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53 addmsg(const char *fmt, ...)
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54 {
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55 va_list args;
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56
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57 va_start(args, fmt);
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58 doadd(fmt, args);
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59 va_end(args);
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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 int
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68 endmsg(void)
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69 {
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70 int ch;
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71
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72 if (save_msg)
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73 strcpy(huh, msgbuf);
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74 if (mpos)
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75 {
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76 look(FALSE);
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77 mvaddstr(0, mpos, "--More--");
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78 refresh();
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79 if (!msg_esc)
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80 wait_for(stdscr, ' ');
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81 else
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82 {
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83 while ((ch = readchar()) != ' ')
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84 if (ch == ESCAPE)
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85 {
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86 msgbuf[0] = '\0';
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87 mpos = 0;
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88 newpos = 0;
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89 msgbuf[0] = '\0';
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90 return ESCAPE;
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91 }
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92 }
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93 }
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94 /*
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95 * All messages should start with uppercase, except ones that
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96 * start with a pack addressing character
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97 */
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98 if (islower((int)msgbuf[0]) && !lower_msg && msgbuf[1] != ')')
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99 msgbuf[0] = (char) toupper(msgbuf[0]);
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100 mvaddstr(0, 0, msgbuf);
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101 clrtoeol();
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102 mpos = newpos;
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103 newpos = 0;
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104 msgbuf[0] = '\0';
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105 refresh();
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106 return ~ESCAPE;
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107 }
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108
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109 /*
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