authd/authd.c

   1 /* authd/authd.c - main code for authd
   2  * Copyright (c) 2016 William Pitcock <nenolod@dereferenced.org>
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice is present in all copies.
   7  *
   8  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   9  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  10  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  11  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  12  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  13  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  14  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  15  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  16  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  17  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  18  * POSSIBILITY OF SUCH DAMAGE.
  19  */
  20
  21 #include "authd.h"
  22 #include "dns.h"
  23
  24 #define MAXPARA 10
  25
  26 rb_helper *authd_helper = NULL;
  27 authd_cmd_handler authd_cmd_handlers[255] = {};
  28
  29 static void
  30 parse_request(rb_helper *helper)
  31 {
  32         static char *parv[MAXPARA + 1];
  33         static char readbuf[READBUF_SIZE];
  34         int parc;
  35         int len;
  36         authd_cmd_handler handler;
  37
  38         while((len = rb_helper_read(helper, readbuf, sizeof(readbuf))) > 0)
  39         {
  40                 parc = rb_string_to_array(readbuf, parv, MAXPARA);
  41
  42                 if(parc < 1)
  43                         continue;
  44
  45                 handler = authd_cmd_handlers[parv[0][0]];
  46                 if (handler != NULL)
  47                         handler(parc, parv);
  48         }
  49 }
  50
  51 static void
  52 error_cb(rb_helper *helper)
  53 {
  54         exit(1);
  55 }
  56
  57 #ifndef WINDOWS
  58 static void
  59 dummy_handler(int sig)
  60 {
  61         return;
  62 }
  63 #endif
  64
  65 static void
  66 setup_signals(void)
  67 {
  68 #ifndef WINDOWS
  69         struct sigaction act;
  70
  71         act.sa_flags = 0;
  72         act.sa_handler = SIG_IGN;
  73         sigemptyset(&act.sa_mask);
  74         sigaddset(&act.sa_mask, SIGPIPE);
  75         sigaddset(&act.sa_mask, SIGALRM);
  76 #ifdef SIGTRAP
  77         sigaddset(&act.sa_mask, SIGTRAP);
  78 #endif
  79
  80 #ifdef SIGWINCH
  81         sigaddset(&act.sa_mask, SIGWINCH);
  82         sigaction(SIGWINCH, &act, 0);
  83 #endif
  84         sigaction(SIGPIPE, &act, 0);
  85 #ifdef SIGTRAP
  86         sigaction(SIGTRAP, &act, 0);
  87 #endif
  88
  89         act.sa_handler = dummy_handler;
  90         sigaction(SIGALRM, &act, 0);
  91 #endif
  92 }
  93
  94 int
  95 main(int argc, char *argv[])
  96 {
  97         setup_signals();
  98
  99         authd_helper = rb_helper_child(parse_request, error_cb, NULL, NULL, NULL, 256, 256, 256);       /* XXX fix me */
 100         if(authd_helper == NULL)
 101         {
 102                 fprintf(stderr, "authd is not meant to be invoked by end users\n");
 103                 exit(1);
 104         }
 105
 106         rb_helper_loop(authd_helper, 0);
 107
 108         return 0;
 109 }