nhrpd/nhrp_main.c

   1 /* NHRP daemon main functions
   2  * Copyright (c) 2014-2015 Timo Teräs
   3  *
   4  * This file is free software: you may copy, redistribute and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  */
   9
  10 #ifdef HAVE_CONFIG_H
  11 #include "config.h"
  12 #endif
  13
  14 #include <unistd.h>
  15
  16 #include "zebra.h"
  17 #include "privs.h"
  18 #include "getopt.h"
  19 #include "thread.h"
  20 #include "sigevent.h"
  21 #include "lib/version.h"
  22 #include "log.h"
  23 #include "memory.h"
  24 #include "command.h"
  25 #include "libfrr.h"
  26 #include "filter.h"
  27
  28 #include "nhrpd.h"
  29 #include "nhrp_errors.h"
  30
  31 DEFINE_MGROUP(NHRPD, "NHRP");
  32
  33 unsigned int debug_flags = 0;
  34
  35 struct thread_master *master;
  36 struct timeval current_time;
  37
  38 /* nhrpd options. */
  39 struct option longopts[] = {{0}};
  40
  41 /* nhrpd privileges */
  42 static zebra_capabilities_t _caps_p[] = {
  43         ZCAP_NET_RAW, ZCAP_NET_ADMIN,
  44         ZCAP_DAC_OVERRIDE, /* for now needed to write to
  45                               /proc/sys/net/ipv4/<if>/send_redirect */
  46 };
  47
  48 struct zebra_privs_t nhrpd_privs = {
  49 #if defined(FRR_USER) && defined(FRR_GROUP)
  50         .user = FRR_USER,
  51         .group = FRR_GROUP,
  52 #endif
  53 #ifdef VTY_GROUP
  54         .vty_group = VTY_GROUP,
  55 #endif
  56         .caps_p = _caps_p,
  57         .cap_num_p = array_size(_caps_p),
  58         .cap_num_i = 0
  59 };
  60
  61
  62 static void parse_arguments(int argc, char **argv)
  63 {
  64         int opt;
  65
  66         while (1) {
  67                 opt = frr_getopt(argc, argv, 0);
  68                 if (opt < 0)
  69                         break;
  70
  71                 switch (opt) {
  72                 case 0:
  73                         break;
  74                 default:
  75                         frr_help_exit(1);
  76                 }
  77         }
  78 }
  79
  80 static void nhrp_sigusr1(void)
  81 {
  82         zlog_rotate();
  83 }
  84
  85 static void nhrp_request_stop(void)
  86 {
  87         debugf(NHRP_DEBUG_COMMON, "Exiting...");
  88         frr_early_fini();
  89
  90         nhrp_shortcut_terminate();
  91         nhrp_nhs_terminate();
  92         nhrp_zebra_terminate();
  93         vici_terminate();
  94         evmgr_terminate();
  95         nhrp_vc_terminate();
  96         vrf_terminate();
  97
  98         debugf(NHRP_DEBUG_COMMON, "Done.");
  99         frr_fini();
 100
 101         exit(0);
 102 }
 103
 104 static struct frr_signal_t sighandlers[] = {
 105         {
 106                 .signal = SIGUSR1,
 107                 .handler = &nhrp_sigusr1,
 108         },
 109         {
 110                 .signal = SIGINT,
 111                 .handler = &nhrp_request_stop,
 112         },
 113         {
 114                 .signal = SIGTERM,
 115                 .handler = &nhrp_request_stop,
 116         },
 117 };
 118
 119 static const struct frr_yang_module_info *const nhrpd_yang_modules[] = {
 120         &frr_filter_info,
 121         &frr_interface_info,
 122         &frr_vrf_info,
 123 };
 124
 125 FRR_DAEMON_INFO(nhrpd, NHRP, .vty_port = NHRP_VTY_PORT,
 126
 127                 .proghelp = "Implementation of the NHRP routing protocol.",
 128
 129                 .signals = sighandlers, .n_signals = array_size(sighandlers),
 130
 131                 .privs = &nhrpd_privs, .yang_modules = nhrpd_yang_modules,
 132                 .n_yang_modules = array_size(nhrpd_yang_modules),
 133 );
 134
 135 int main(int argc, char **argv)
 136 {
 137         frr_preinit(&nhrpd_di, argc, argv);
 138         frr_opt_add("", longopts, "");
 139
 140         parse_arguments(argc, argv);
 141
 142         /* Library inits. */
 143         master = frr_init();
 144         nhrp_error_init();
 145         vrf_init(NULL, NULL, NULL, NULL);
 146         nhrp_interface_init();
 147         resolver_init(master);
 148
 149         /*
 150          * Run with elevated capabilities, as for all netlink activity
 151          * we need privileges anyway.
 152          * The assert is for clang SA code where it does
 153          * not see the change function being set in lib
 154          */
 155         assert(nhrpd_privs.change);
 156         nhrpd_privs.change(ZPRIVS_RAISE);
 157
 158         evmgr_init();
 159         nhrp_vc_init();
 160         nhrp_packet_init();
 161         vici_init();
 162         if_zapi_callbacks(nhrp_ifp_create, nhrp_ifp_up,
 163                           nhrp_ifp_down, nhrp_ifp_destroy);
 164         nhrp_zebra_init();
 165         nhrp_shortcut_init();
 166
 167         nhrp_config_init();
 168
 169         frr_config_fork();
 170         frr_run(master);
 171         return 0;
 172 }