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annotate src/lwwire-serial.c @ 9:a11b330771e0

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Fix buffer pointer handling when logging received bytes Actually save the read buffer pointer so we can log the actual protocol bytes read in all cases correctly instead of displaying out of bounds memory in the case where the packet arrives in multiple pieces.
author William Astle <lost@l-w.ca>
date Sat, 30 Jul 2016 10:35:14 -0600
parents cfc9524cca2c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
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1 /*
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2 Set up a serial port and launch a lwwire process to handle it. The lwwire
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3 process will be called with "exec".
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4
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5 Usage:
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6
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7 lwwire-serial <port> [speed] [lwwire binary args...]
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8
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9 <port> is the device name for the serial port. [speed] is the optional speed
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10 to set the port to with a default of 115200. [lwwire binary] is the optional
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11 name for the lwwire binary. Default is "./lwwire". If [lwwire binary] is
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12 specified, then [speed] must also be specified.
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13
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14 */
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15
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16 #include <errno.h>
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17 #include <fcntl.h>
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18 #include <stdio.h>
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19 #include <stdlib.h>
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20 #include <string.h>
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21 #include <termios.h>
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22 #include <unistd.h>
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23
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24 int main(int argc, char **argv)
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25 {
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26 char *lwwire = "lwwire";
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27 int speed = 115200;
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28 char *port;
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29 int i, rargc;
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30 char **rargv;
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31 int fd;
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32 struct termios io_mod;
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33
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34 if (argc >= 4)
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35 {
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36 lwwire = argv[3];
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37 }
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38 if (argc >= 3)
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39 {
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40 speed = strtol(argv[2], NULL, 10);
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41 }
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42 if (argc < 2)
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43 {
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44 fprintf(stderr, "Usage: %s <port> [<speed> [<lwwire binary> [args]]]\n", argv[0]);
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45 exit(0);
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46 }
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47 port = argv[1];
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48
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49 fprintf(stderr, "Starting lwwire on port '%s' at speed %d\n", port, speed);
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50
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51 // open serial port
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52 fd = open(port, O_RDWR | O_NOCTTY);
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53 if (fd < 0)
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54 {
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55 fprintf(stderr, "Error opening port %s: %s\n", port, strerror(errno));
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56 exit(1);
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57 }
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58 // set up parameters
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59 // this is all theoretically *mostly* posix correct except for some of the
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60 // Bxxxx constants.
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61 tcgetattr(fd, &io_mod);
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62 io_mod.c_iflag &=
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63 ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
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64 io_mod.c_oflag &= ~OPOST;
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65 io_mod.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
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66 io_mod.c_cflag &= ~(CSIZE|PARENB);
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67 io_mod.c_cflag |= CS8;
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68 switch (speed)
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69 {
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70 case 38400:
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71 cfsetispeed(&io_mod, B38400);
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72 cfsetospeed(&io_mod, B38400);
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73 break;
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74
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75 case 57600:
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76 cfsetispeed(&io_mod, B57600);
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77 cfsetospeed(&io_mod, B57600);
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78 break;
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79
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80 case 115200:
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81 cfsetispeed(&io_mod, B115200);
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82 cfsetospeed(&io_mod, B115200);
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83 break;
1
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84
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85 #ifdef B230400
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86 case 230400:
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87 cfsetispeed(&io_mod, B230400);
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88 cfsetospeed(&io_mod, B230400);
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89 break;
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90 #endif
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91
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92 #ifdef B460800
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93 case 460800:
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94 cfsetispeed(&io_mod, B460800);
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95 cfsetospeed(&io_mod, B460800);
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96 break;
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97 #endif
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98
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99 #ifdef B921600
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100 case 921600:
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101 cfsetispeed(&io_mod, B921600);
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102 cfsetospeed(&io_mod, B921600);
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103 break;
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104 #endif
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105
0
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106 default:
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107 fprintf(stderr, "Unrecognzied speed %d on port %s; using 38400\n", speed, port);
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108 cfsetispeed(&io_mod, B38400);
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109 cfsetospeed(&io_mod, B38400);
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110 break;
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111 }
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112
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113 if (tcsetattr(fd, TCSANOW, &io_mod) < 0)
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114 {
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115 fprintf(stderr, "Cannot set serial line mode properly: %s", strerror(errno));
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116 exit(1);
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117 }
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118
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119 // set up stdin/stdout
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120 if (dup2(fd, 0) < 0)
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121 {
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122 fprintf(stderr, "Cannot set up stdin file descriptor: %s\n", strerror(errno));
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123 exit(1);
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124 }
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125 if (dup2(fd, 1) < 0)
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126 {
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127 fprintf(stderr, "Cannot set up stdout file descriptor: %s\n", strerror(errno));
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128 exit(1);
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129 }
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130 // close the original FD since we don't need it any more.
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131 close(fd);
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132
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133 // execute binary
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134 rargc = 1;
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135 if (argc >= 5)
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136 {
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137 rargc += argc - 4;
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138 }
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139 rargv = malloc(sizeof(char *) * (rargc + 1));
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140 rargv[0] = lwwire;
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141 for (i = 4; i < argc; i++)
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142 {
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143 fprintf(stderr, "Passing argument %d of %d: %s\n", i - 3, rargc, argv[i]);
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144 rargv[i - 3] = argv[i];
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145 }
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146 rargv[rargc] = NULL;
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147
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148 execv(lwwire, rargv);
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149 fprintf(stderr, "Failed to execute %s: %s\n", lwwire, strerror(errno));
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150 exit(1);
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151 }