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annotate ptyhelper.c @ 17:d3e3d6b4016b

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rlgwebd: switch to dgamelaunch's SQLite database. The quickrypt utility is replaced with sqlickrypt, which takes a username and password pair and checks them against the SQLite password database used by dgamelaunch. This will be more extensible to using rlgwebd to register, change passwords, etc.
author John "Elwin" Edwards <elwin@sdf.org>
date Sun, 20 May 2012 15:52:07 -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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