annotate loadtools/ttypassthru.c @ 921:74d284add54d

fc-fsio: guard against bogus readdir results from the target If the FFS being operated on contains SE K2x0 extended filenames, readdir will return strings that are bad for printing. We need to guard against this possibility, and also against possible other bogosity that could be sent by other alien firmwares.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 31 Dec 2022 22:55:23 +0000
parents e7502631a0f9
children
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1 /*
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2 * This module implements the pass-thru operation mode, in which
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3 * the Unix host tty is cross-connected directly to the target
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4 * running some code we have just loaded.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <sys/ioctl.h>
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9 #include <sys/errno.h>
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10 #include <termios.h>
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11 #include <stdio.h>
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12 #include <stdlib.h>
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13 #include <unistd.h>
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14 #include <strings.h>
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15
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16 extern int errno;
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17
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18 extern int target_fd;
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19
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20 static struct termios saved_termios, my_termios;
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21
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22 static void
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23 safe_output(buf, cc)
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24 u_char *buf;
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25 {
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26 int i, c;
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27
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28 for (i = 0; i < cc; i++) {
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29 c = buf[i];
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30 if (c == '\r' || c == '\n' || c == '\t' || c == '\b') {
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31 putchar(c);
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32 continue;
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33 }
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34 if (c & 0x80) {
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35 putchar('M');
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36 putchar('-');
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37 c &= 0x7F;
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38 }
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39 if (c < 0x20) {
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40 putchar('^');
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41 putchar(c + '@');
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42 } else if (c == 0x7F) {
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43 putchar('^');
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44 putchar('?');
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45 } else
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46 putchar(c);
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47 }
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48 fflush(stdout);
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49 }
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50
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51 static void
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52 loop()
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53 {
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54 char buf[BUFSIZ];
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55 fd_set fds, fds1;
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56 register int i, cc, max;
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57
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58 FD_ZERO(&fds);
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59 FD_SET(0, &fds);
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60 FD_SET(target_fd, &fds);
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61 max = target_fd + 1;
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62 for (;;) {
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63 bcopy(&fds, &fds1, sizeof(fd_set));
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64 i = select(max, &fds1, NULL, NULL, NULL);
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65 if (i < 0) {
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66 if (errno == EINTR)
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67 continue;
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68 tcsetattr(0, TCSAFLUSH, &saved_termios);
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69 perror("select");
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70 exit(1);
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71 }
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72 if (FD_ISSET(0, &fds1)) {
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73 cc = read(0, buf, sizeof buf);
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74 if (cc <= 0)
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75 return;
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76 if (cc == 1 && buf[0] == 0x1C)
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77 return;
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78 write(target_fd, buf, cc);
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79 }
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80 if (FD_ISSET(target_fd, &fds1)) {
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81 cc = read(target_fd, buf, sizeof buf);
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82 if (cc <= 0) {
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83 tcsetattr(0, TCSAFLUSH, &saved_termios);
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84 fprintf(stderr, "EOF/error on target tty\n");
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85 exit(1);
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86 }
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87 safe_output(buf, cc);
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88 }
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89 }
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90 }
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91
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92 tty_passthru()
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93 {
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94 static int zero = 0;
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95
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96 ioctl(target_fd, FIONBIO, &zero);
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97
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98 tcgetattr(0, &saved_termios);
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99 bcopy(&saved_termios, &my_termios, sizeof(struct termios));
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100 cfmakeraw(&my_termios);
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101 my_termios.c_cc[VMIN] = 1;
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102 my_termios.c_cc[VTIME] = 0;
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103 tcsetattr(0, TCSAFLUSH, &my_termios);
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104
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105 printf("Entering tty pass-thru; type ^\\ to exit\r\n\n");
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106 loop();
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107 tcsetattr(0, TCSAFLUSH, &saved_termios);
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108 return 0;
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109 }