nhrpd: implement next hop resolution protocol

This provides DMVPN support and integrates to strongSwan. Please read
README.nhrpd and README.kernel for more details.

[DL: cherry-picked from dafa05e65fe4b3b3ed5525443f554215ba14f42c]
[DL: merge partially resolved, this commit will not build.]
Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

1 files changed, 246 insertions, 0 deletions

diff --git a/nhrpd/nhrp_main.c b/nhrpd/nhrp_main.c
new file mode 100644
index 000000000..29349a038
--- /dev/null
+++ b/nhrpd/nhrp_main.c
@@ -0,0 +1,246 @@
+/* NHRP daemon main functions
+ * Copyright (c) 2014-2015 Timo Teräs
+ *
+ * This file is free software: you may copy, redistribute and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <unistd.h>
+
+#include "zebra.h"
+#include "privs.h"
+#include "getopt.h"
+#include "thread.h"
+#include "sigevent.h"
+#include "version.h"
+#include "log.h"
+#include "memory.h"
+#include "command.h"
+
+#include "nhrpd.h"
+#include "netlink.h"
+
+unsigned int debug_flags = 0;
+
+struct thread_master *master;
+struct timeval current_time;
+static const char *pid_file = PATH_NHRPD_PID;
+static char config_default[] = SYSCONFDIR NHRP_DEFAULT_CONFIG;
+static char *config_file = NULL;
+static char *vty_addr = NULL;
+static int vty_port = NHRP_VTY_PORT;
+static int do_daemonise = 0;
+
+/* nhrpd options. */
+struct option longopts[] = {
+	{ "daemon",      no_argument,       NULL, 'd'},
+	{ "config_file", required_argument, NULL, 'f'},
+	{ "pid_file",    required_argument, NULL, 'i'},
+	{ "socket",      required_argument, NULL, 'z'},
+	{ "help",        no_argument,       NULL, 'h'},
+	{ "vty_addr",    required_argument, NULL, 'A'},
+	{ "vty_port",    required_argument, NULL, 'P'},
+	{ "user",        required_argument, NULL, 'u'},
+	{ "group",       required_argument, NULL, 'g'},
+	{ "version",     no_argument,       NULL, 'v'},
+	{ 0 }
+};
+
+/* nhrpd privileges */
+static zebra_capabilities_t _caps_p [] = {
+	ZCAP_NET_RAW,
+	ZCAP_NET_ADMIN,
+	ZCAP_DAC_OVERRIDE,	/* for now needed to write to /proc/sys/net/ipv4/<if>/send_redirect */
+};
+
+static struct zebra_privs_t nhrpd_privs = {
+#ifdef QUAGGA_USER
+	.user = QUAGGA_USER,
+#endif
+#ifdef QUAGGA_GROUP
+	.group = QUAGGA_GROUP,
+#endif
+#ifdef VTY_GROUP
+	.vty_group = VTY_GROUP,
+#endif
+	.caps_p = _caps_p,
+	.cap_num_p = ZEBRA_NUM_OF(_caps_p),
+};
+
+static void usage(const char *progname, int status)
+{
+	if (status != 0)
+		fprintf(stderr, "Try `%s --help' for more information.\n", progname);
+	else
+		printf(
+"Usage : %s [OPTION...]\n\
+Daemon which manages NHRP protocol.\n\n\
+-d, --daemon       Runs in daemon mode\n\
+-f, --config_file  Set configuration file name\n\
+-i, --pid_file     Set process identifier file name\n\
+-z, --socket       Set path of zebra socket\n\
+-A, --vty_addr     Set vty's bind address\n\
+-P, --vty_port     Set vty's port number\n\
+-u, --user         User to run as\n\
+-g, --group        Group to run as\n\
+-v, --version      Print program version\n\
+-h, --help         Display this help and exit\n\
+\n\
+Report bugs to %s\n", progname, ZEBRA_BUG_ADDRESS);
+
+	exit(status);
+}
+
+static void parse_arguments(const char *progname, int argc, char **argv)
+{
+	int opt;
+
+	while (1) {
+		opt = getopt_long(argc, argv, "df:i:z:hA:P:u:g:v", longopts, 0);
+		if(opt < 0) break;
+
+		switch (opt) {
+		case 0:
+			break;
+		case 'd':
+			do_daemonise = -1;
+			break;
+		case 'f':
+			config_file = optarg;
+			break;
+		case 'i':
+			pid_file = optarg;
+			break;
+		case 'z':
+			zclient_serv_path_set(optarg);
+			break;
+		case 'A':
+			vty_addr = optarg;
+			break;
+		case 'P':
+			vty_port = atoi (optarg);
+			if (vty_port <= 0 || vty_port > 0xffff)
+				vty_port = NHRP_VTY_PORT;
+			break;
+		case 'u':
+			nhrpd_privs.user = optarg;
+			break;
+		case 'g':
+			nhrpd_privs.group = optarg;
+			break;
+		case 'v':
+			print_version(progname);
+			exit(0);
+			break;
+		case 'h':
+			usage(progname, 0);
+			break;
+		default:
+			usage(progname, 1);
+			break;
+		}
+	}
+}
+
+static void nhrp_sigusr1(void)
+{
+	zlog_rotate(NULL);
+}
+
+static void nhrp_request_stop(void)
+{
+	debugf(NHRP_DEBUG_COMMON, "Exiting...");
+
+	nhrp_shortcut_terminate();
+	nhrp_nhs_terminate();
+	nhrp_zebra_terminate();
+	vici_terminate();
+	evmgr_terminate();
+	nhrp_vc_terminate();
+	vrf_terminate();
+	/* memory_terminate(); */
+	/* vty_terminate(); */
+	cmd_terminate();
+	/* signal_terminate(); */
+	zprivs_terminate(&nhrpd_privs);
+
+	debugf(NHRP_DEBUG_COMMON, "Remove pid file.");
+	if (pid_file) unlink(pid_file);
+	debugf(NHRP_DEBUG_COMMON, "Done.");
+
+	closezlog(zlog_default);
+
+	exit(0);
+}
+
+static struct quagga_signal_t sighandlers[] = {
+	{ .signal = SIGUSR1, .handler = &nhrp_sigusr1, },
+	{ .signal = SIGINT,  .handler = &nhrp_request_stop, },
+	{ .signal = SIGTERM, .handler = &nhrp_request_stop, },
+};
+
+int main(int argc, char **argv)
+{
+	struct thread thread;
+	const char *progname;
+
+	/* Set umask before anything for security */
+	umask(0027);
+	progname = basename(argv[0]);
+	zlog_default = openzlog(progname, ZLOG_NHRP, LOG_CONS|LOG_NDELAY|LOG_PID, LOG_DAEMON);
+	zlog_set_level(NULL, ZLOG_DEST_STDOUT, LOG_WARNING);
+
+	parse_arguments(progname, argc, argv);
+
+	/* Library inits. */
+	master = thread_master_create();
+	zprivs_init(&nhrpd_privs);
+	signal_init(master, array_size(sighandlers), sighandlers);
+	cmd_init(1);
+	vty_init(master);
+	memory_init();
+	nhrp_interface_init();
+	vrf_init();
+	resolver_init();
+
+	/* Run with elevated capabilities, as for all netlink activity
+	 * we need privileges anyway. */
+	nhrpd_privs.change(ZPRIVS_RAISE);
+
+	netlink_init();
+	evmgr_init();
+	nhrp_vc_init();
+	nhrp_packet_init();
+	vici_init();
+	nhrp_zebra_init();
+	nhrp_shortcut_init();
+
+	nhrp_config_init();
+
+	/* Get zebra configuration file. */
+	zlog_set_level(NULL, ZLOG_DEST_STDOUT, do_daemonise ? ZLOG_DISABLED : LOG_DEBUG);
+	vty_read_config(config_file, config_default);
+
+	if (do_daemonise && daemon(0, 0) < 0) {
+		zlog_err("daemonise: %s", safe_strerror(errno));
+		exit (1);
+	}
+
+	/* write pid file */
+	if (pid_output(pid_file) < 0) {
+		zlog_err("error while writing pidfile");
+		exit (1);
+	}
+
+	/* Create VTY socket */
+	vty_serv_sock(vty_addr, vty_port, NHRP_VTYSH_PATH);
+	zlog_notice("nhrpd starting: vty@%d", vty_port);
+
+	/* Main loop */
+	while (thread_fetch(master, &thread))
+		thread_call(&thread);
+
+	return 0;
+}