nhrpd/nhrp_main.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* NHRP daemon main functions
   3  * Copyright (c) 2014-2015 Timo Teräs
   4  */
   5
   6 #ifdef HAVE_CONFIG_H
   7 #include "config.h"
   8 #endif
   9
  10 #include <unistd.h>
  11
  12 #include "zebra.h"
  13 #include "privs.h"
  14 #include "getopt.h"
  15 #include "thread.h"
  16 #include "sigevent.h"
  17 #include "lib/version.h"
  18 #include "log.h"
  19 #include "memory.h"
  20 #include "command.h"
  21 #include "libfrr.h"
  22 #include "filter.h"
  23
  24 #include "nhrpd.h"
  25 #include "nhrp_errors.h"
  26
  27 DEFINE_MGROUP(NHRPD, "NHRP");
  28
  29 unsigned int debug_flags = 0;
  30
  31 struct thread_master *master;
  32 struct timeval current_time;
  33
  34 /* nhrpd options. */
  35 struct option longopts[] = {{0}};
  36
  37 /* nhrpd privileges */
  38 static zebra_capabilities_t _caps_p[] = {
  39         ZCAP_NET_RAW, ZCAP_NET_ADMIN,
  40         ZCAP_DAC_OVERRIDE, /* for now needed to write to
  41                               /proc/sys/net/ipv4/<if>/send_redirect */
  42 };
  43
  44 struct zebra_privs_t nhrpd_privs = {
  45 #if defined(FRR_USER) && defined(FRR_GROUP)
  46         .user = FRR_USER,
  47         .group = FRR_GROUP,
  48 #endif
  49 #ifdef VTY_GROUP
  50         .vty_group = VTY_GROUP,
  51 #endif
  52         .caps_p = _caps_p,
  53         .cap_num_p = array_size(_caps_p),
  54         .cap_num_i = 0
  55 };
  56
  57
  58 static void parse_arguments(int argc, char **argv)
  59 {
  60         int opt;
  61
  62         while (1) {
  63                 opt = frr_getopt(argc, argv, 0);
  64                 if (opt < 0)
  65                         break;
  66
  67                 switch (opt) {
  68                 case 0:
  69                         break;
  70                 default:
  71                         frr_help_exit(1);
  72                 }
  73         }
  74 }
  75
  76 static void nhrp_sigusr1(void)
  77 {
  78         zlog_rotate();
  79 }
  80
  81 static void nhrp_request_stop(void)
  82 {
  83         debugf(NHRP_DEBUG_COMMON, "Exiting...");
  84         frr_early_fini();
  85
  86         nhrp_shortcut_terminate();
  87         nhrp_nhs_terminate();
  88         nhrp_zebra_terminate();
  89         vici_terminate();
  90         evmgr_terminate();
  91         nhrp_vc_terminate();
  92         vrf_terminate();
  93
  94         debugf(NHRP_DEBUG_COMMON, "Done.");
  95         frr_fini();
  96
  97         exit(0);
  98 }
  99
 100 static struct frr_signal_t sighandlers[] = {
 101         {
 102                 .signal = SIGUSR1,
 103                 .handler = &nhrp_sigusr1,
 104         },
 105         {
 106                 .signal = SIGINT,
 107                 .handler = &nhrp_request_stop,
 108         },
 109         {
 110                 .signal = SIGTERM,
 111                 .handler = &nhrp_request_stop,
 112         },
 113 };
 114
 115 static const struct frr_yang_module_info *const nhrpd_yang_modules[] = {
 116         &frr_filter_info,
 117         &frr_interface_info,
 118         &frr_vrf_info,
 119 };
 120
 121 FRR_DAEMON_INFO(nhrpd, NHRP, .vty_port = NHRP_VTY_PORT,
 122
 123                 .proghelp = "Implementation of the NHRP routing protocol.",
 124
 125                 .signals = sighandlers, .n_signals = array_size(sighandlers),
 126
 127                 .privs = &nhrpd_privs, .yang_modules = nhrpd_yang_modules,
 128                 .n_yang_modules = array_size(nhrpd_yang_modules),
 129 );
 130
 131 int main(int argc, char **argv)
 132 {
 133         frr_preinit(&nhrpd_di, argc, argv);
 134         frr_opt_add("", longopts, "");
 135
 136         parse_arguments(argc, argv);
 137
 138         /* Library inits. */
 139         master = frr_init();
 140         nhrp_error_init();
 141         vrf_init(NULL, NULL, NULL, NULL);
 142         nhrp_interface_init();
 143         resolver_init(master);
 144
 145         /*
 146          * Run with elevated capabilities, as for all netlink activity
 147          * we need privileges anyway.
 148          * The assert is for clang SA code where it does
 149          * not see the change function being set in lib
 150          */
 151         assert(nhrpd_privs.change);
 152         nhrpd_privs.change(ZPRIVS_RAISE);
 153
 154         evmgr_init();
 155         nhrp_vc_init();
 156         nhrp_packet_init();
 157         vici_init();
 158         if_zapi_callbacks(nhrp_ifp_create, nhrp_ifp_up,
 159                           nhrp_ifp_down, nhrp_ifp_destroy);
 160         nhrp_zebra_init();
 161         nhrp_shortcut_init();
 162
 163         nhrp_config_init();
 164
 165         frr_config_fork();
 166         frr_run(master);
 167         return 0;
 168 }