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annotate ptyhelper.c @ 143:f1676e81c80a

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sqlickrypt: add support for salted SHA-512 passwords, and fix NULL bug. Passwords will now be securely encrypted with random salt. Also avoid storing NULL in the database, because that makes dgamelaunch segfault.
author John "Elwin" Edwards
date Sun, 20 Oct 2013 21:19:13 -0700
parents 9bef0941c6dd
children
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1
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1 /*
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2 * ptyhelper: a utility that runs a command in a pseudoterm and then streams
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3 * stdio to/from it. Intended to get around the node.js loss of C/UNIX
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4 * functionality.
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5 * Remember to compile with -lutil.
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6 */
0
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <unistd.h>
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10 #include <signal.h>
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11 #include <pty.h>
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12 #include <utmp.h>
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13 #include <sys/types.h>
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14 #include <sys/wait.h>
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15 #include <sys/select.h>
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16 #include <termios.h>
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17
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18 int got_sighup = 0;
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19
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20 void handle_HUP(int signum) {
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21 if (signum == SIGHUP)
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22 got_sighup = 1;
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23 return;
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24 }
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25
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26 int main(int argc, char *argv[]) {
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27
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28 int ptymaster, ptyslave; /* File descriptors */
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29 int child;
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30 int status, selstatus;
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31 int w = 80, h = 24, t;
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32 struct sigaction sighup_act;
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33 fd_set readset;
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34 struct timeval select_time;
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35 char buf[4096];
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36 int nread;
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37 char *penv, *ptmp;
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38 #if 0
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39 struct termios ptysettings;
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40 #endif
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41 struct winsize ptysize;
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42
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43 if (argc == 1) {
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44 fprintf(stderr, "No command given.\n");
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45 exit(1);
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46 }
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47
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48 /* Set up the signal handler. */
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49 sighup_act.sa_handler = &handle_HUP;
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50 sighup_act.sa_flags = SA_RESTART;
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51 sigaction(SIGHUP, &sighup_act, NULL);
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52
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53 /* Check the environment for configuration options. */
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54 penv = getenv("PTYHELPER");
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55 if (penv != NULL) {
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56 t = strtol(penv, &ptmp, 10);
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57 if (t > 0 && t < 256)
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58 h = t;
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59 if (*ptmp != '\0') {
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60 penv = ptmp + 1;
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61 t = strtol(penv, &ptmp, 10);
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62 if (t > 0 && t < 256)
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63 w = t;
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64 }
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65 }
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66 /* Set up the size. */
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67 ptysize.ws_row = h;
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68 ptysize.ws_col = w;
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69
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70 /* Open a pty */
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71 if (openpty(&ptymaster, &ptyslave, NULL, NULL, &ptysize)) {
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72 return 1;
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73 }
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74 #if 0
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75 /* Put it into raw mode. */
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76 tcgetattr(ptyslave, &ptysettings);
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77 cfmakeraw(&ptysettings);
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78 tcsetattr(ptyslave, TCSANOW, &ptysettings);
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79 #endif
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80
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81 /* Start the child */
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82 /* forkpty() might be more convenient. */
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83 if (!(child = fork())) {
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84 /* Child process */
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85 login_tty(ptyslave);
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86 close(ptymaster);
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87 execvp(argv[1], argv + 1);
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88 perror("execvp() failed");
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89 return 1;
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90 }
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91 close(ptyslave);
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92
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93 while (1) {
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94 /* Now do a select() over stdin and ptymaster, and write anything that
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95 * appears to ptymaster and stdout respectively. */
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96 FD_ZERO(&readset);
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97 FD_SET(0, &readset);
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98 FD_SET(ptymaster, &readset);
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99 select_time.tv_sec = 1;
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100 select_time.tv_usec = 0;
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101 selstatus = select(ptymaster + 1, &readset, NULL, NULL, &select_time);
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102 if (selstatus > 0) {
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103 /* TODO make sure it all gets written if a signal interrupts write(). */
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104 if (FD_ISSET(0, &readset)) {
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105 nread = read(0, buf, 4096);
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106 if (nread > 0) {
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107 write(ptymaster, buf, nread);
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108 }
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109 }
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110 if (FD_ISSET(ptymaster, &readset)) {
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111 nread = read(ptymaster, buf, 4096);
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112 if (nread > 0) {
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113 write(1, buf, nread);
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114 }
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115 }
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116 }
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117
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118 /* Periodically check to see if we're done. */
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119 /* TODO: catch SIGCHLD and only wait() if it is delivered. */
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120 if (waitpid(child, &status, WNOHANG)) {
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121 break;
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122 }
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123
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124 /* If node sighup's us, pass it along. */
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125 if (got_sighup) {
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126 kill(child, SIGHUP);
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127 }
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128 }
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129
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130 /* Get any leftover output and clean up. */
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131 /* FIXME looping over select() is pointless if there's only one fd that
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132 * nothing's writing to. Just loop over read() until it's empty. */
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133 while (1) {
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134 FD_ZERO(&readset);
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135 FD_SET(ptymaster, &readset);
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136 select_time.tv_sec = 0;
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137 select_time.tv_usec = 0;
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138 if (select(ptymaster + 1, &readset, NULL, NULL, &select_time) > 0) {
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139 nread = read(ptymaster, buf, 4096);
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140 if (nread > 0) {
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141 write(1, buf, nread);
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142 }
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143 else
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144 break;
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145 }
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146 else
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147 break;
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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148 }
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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149 close(ptymaster);
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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150
bd412f63ce0d Put this project under version control, finally.
John "Elwin" Edwards <elwin@sdf.org>
parents:
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151 /* Return the child's exit status. */
bd412f63ce0d Put this project under version control, finally.
John "Elwin" Edwards <elwin@sdf.org>
parents:
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152 if (WIFEXITED(status))
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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153 return WEXITSTATUS(status);
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John "Elwin" Edwards <elwin@sdf.org>
parents:
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154 return 0;
bd412f63ce0d Put this project under version control, finally.
John "Elwin" Edwards <elwin@sdf.org>
parents:
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155 }