mdw@git.distorted.org.uk Git - tripe/blob - common/util.c

   1 /* -*-c-*-
   2  *
   3  * $Id: util.c,v 1.3 2004/04/08 01:36:17 mdw Exp $
   4  *
   5  * Utilities for the client and the server
   6  *
   7  * (c) 2001 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Trivial IP Encryption (TrIPE).
  13  *
  14  * TrIPE is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * TrIPE is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with TrIPE; if not, write to the Free Software Foundation,
  26  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 /*----- Header files ------------------------------------------------------*/
  30
  31 #include <errno.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35
  36 #include <sys/types.h>
  37 #include <unistd.h>
  38 #include <fcntl.h>
  39
  40 #include <mLib/dstr.h>
  41
  42 #include "util.h"
  43
  44 #include <sys/ioctl.h>
  45
  46 /*----- Main code ---------------------------------------------------------*/
  47
  48 /* --- @u_quotify@ --- *
  49  *
  50  * Arguments:   @dstr *d@ = where to write the answer
  51  *              @const char *p@ = string to quotify
  52  *
  53  * Returns:     ---
  54  *
  55  * Use:         Quotes the given string if necessary, according to our
  56  *              quoting rules.
  57  */
  58
  59 void u_quotify(dstr *d, const char *p)
  60 {
  61   if (d->len)
  62     dstr_putc(d, ' ');
  63   if (*p && !p[strcspn(p, "\"' \t\n\v")])
  64     dstr_puts(d, p);
  65   else {
  66     dstr_putc(d, '\"');
  67     while (*p) {
  68       if (*p == '\\' || *p == '\"')
  69         dstr_putc(d, '\\');
  70       dstr_putc(d, *p++);
  71     }
  72     dstr_putc(d, '\"');
  73   }
  74 }
  75
  76 /* --- @u_detach@ --- *
  77  *
  78  * Arguments:   ---
  79  *
  80  * Returns:     ---
  81  *
  82  * Use:         Detaches from the current terminal and ensures it can never
  83  *              acquire a new one.  Calls @fork@.
  84  */
  85
  86 void u_detach(void)
  87 {
  88 #ifdef TIOCNOTTY
  89   {
  90     int fd;
  91     if ((fd = open("/dev/tty", O_RDONLY)) >= 0) {
  92       ioctl(fd, TIOCNOTTY);
  93       close(fd);
  94     }
  95   }
  96 #endif
  97   setsid();
  98   if (fork() > 0)
  99     _exit(0);
 100 }
 101
 102 /* --- @u_daemon@ --- *
 103  *
 104  * Arguments:   ---
 105  *
 106  * Returns:     Zero if OK, nonzero on failure.
 107  *
 108  * Use:         Becomes a daemon.
 109  */
 110
 111 int u_daemon(void)
 112 {
 113   pid_t kid;
 114
 115   if ((kid = fork()) < 0)
 116     return (-1);
 117   if (kid)
 118     _exit(0);
 119   u_detach();
 120   return (0);
 121 }
 122
 123 /*----- That's all, folks -------------------------------------------------*/