FreeCalypso > hg > freecalypso-tools

annotate loadtools/ttypassthru.c @ 1011:6d9b10633f10 default tip

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etmsync Pirelli IMEI retrieval: fix poor use of printf() Bug reported by Vadim Yanitskiy <fixeria@osmocom.org>: the construct where a static-allocated string was passed to printf() without any format arguments causes newer compilers to report a security problem. Given that formatted output is not needed here, just fixed string output, change printf() to fputs(), and direct the error message to stderr while at it.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 23 May 2024 17:29:57 +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 }