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 #include "provider.h"
  24
  25 #define MAXPARA 10
  26
  27 static void handle_reload(int parc, char *parv[]);
  28 static void handle_stat(int parc, char *parv[]);
  29
  30 rb_helper *authd_helper = NULL;
  31 authd_cmd_handler authd_cmd_handlers[256] = {
  32 <<<<<<< HEAD
  33         ['C'] = handle_new_connection,
  34         ['D'] = resolve_dns,
  35         ['R'] = handle_reload,
  36         ['S'] = handle_stat,
  37 };
  38
  39 authd_stat_handler authd_stat_handlers[256] = {
  40         ['D'] = enumerate_nameservers,
  41 };
  42
  43 authd_reload_handler authd_reload_handlers[256] = {
  44         ['D'] = reload_nameservers,
  45 };
  46
  47 static void
  48 handle_stat(int parc, char *parv[])
  49 {
  50         authd_stat_handler handler;
  51
  52         if(parc < 3)
  53         {
  54                 warn_opers(L_CRIT, "BUG: handle_stat received too few parameters (at least 3 expected, got %d)", parc);
  55                 return;
  56         }
  57
  58         if (!(handler = authd_stat_handlers[(unsigned char)parv[2][0]]))
  59                 return;
  60
  61         handler(parv[1], parv[2][0]);
  62 }
  63
  64 static void
  65 handle_reload(int parc, char *parv[])
  66 {
  67         authd_reload_handler handler;
  68
  69         if(parc < 2)
  70         {
  71                 /* Reload all handlers */
  72                 for(size_t i = 0; i < sizeof(authd_reload_handlers); handler = authd_reload_handlers[i++])
  73                         handler(parv[1][0]);
  74
  75                 return;
  76         }
  77
  78         if (!(handler = authd_reload_handlers[(unsigned char)parv[1][0]]))
  79                 return;
  80
  81         handler(parv[1][0]);
  82 }
  83
  84 static void
  85 parse_request(rb_helper *helper)
  86 {
  87         static char *parv[MAXPARA + 1];
  88         static char readbuf[READBUF_SIZE];
  89         int parc;
  90         int len;
  91         authd_cmd_handler handler;
  92
  93         while((len = rb_helper_read(helper, readbuf, sizeof(readbuf))) > 0)
  94         {
  95                 parc = rb_string_to_array(readbuf, parv, MAXPARA);
  96
  97                 if(parc < 1)
  98                         continue;
  99
 100                 handler = authd_cmd_handlers[(unsigned char)parv[0][0]];
 101                 if (handler != NULL)
 102                         handler(parc, parv);
 103         }
 104 }
 105
 106 static void
 107 error_cb(rb_helper *helper)
 108 {
 109         exit(1);
 110 }
 111
 112 #ifndef _WIN32
 113 static void
 114 dummy_handler(int sig)
 115 {
 116         return;
 117 }
 118 #endif
 119
 120 static void
 121 setup_signals(void)
 122 {
 123 #ifndef _WIN32
 124         struct sigaction act;
 125
 126         act.sa_flags = 0;
 127         act.sa_handler = SIG_IGN;
 128         sigemptyset(&act.sa_mask);
 129         sigaddset(&act.sa_mask, SIGPIPE);
 130         sigaddset(&act.sa_mask, SIGALRM);
 131 #ifdef SIGTRAP
 132         sigaddset(&act.sa_mask, SIGTRAP);
 133 #endif
 134
 135 #ifdef SIGWINCH
 136         sigaddset(&act.sa_mask, SIGWINCH);
 137         sigaction(SIGWINCH, &act, 0);
 138 #endif
 139         sigaction(SIGPIPE, &act, 0);
 140 #ifdef SIGTRAP
 141         sigaction(SIGTRAP, &act, 0);
 142 #endif
 143
 144         act.sa_handler = dummy_handler;
 145         sigaction(SIGALRM, &act, 0);
 146 #endif
 147 }
 148
 149 int
 150 main(int argc, char *argv[])
 151 {
 152         setup_signals();
 153
 154         authd_helper = rb_helper_child(parse_request, error_cb, NULL, NULL, NULL, 256, 256, 256);       /* XXX fix me */
 155         if(authd_helper == NULL)
 156         {
 157                 fprintf(stderr, "authd is not meant to be invoked by end users\n");
 158                 exit(1);
 159         }
 160
 161         rb_set_time();
 162         setup_signals();
 163         init_resolver();
 164         init_providers();
 165         rb_init_prng(NULL, RB_PRNG_DEFAULT);
 166
 167         rb_helper_loop(authd_helper, 0);
 168
 169         return 0;
 170 }