import NSD 4.0.0, tests from Dorian Büttner, Patrik Lundin, requested by brad@

1 files changed, 415 insertions, 0 deletions

diff --git a/usr.sbin/nsd/nsd-control.c b/usr.sbin/nsd/nsd-control.c
new file mode 100644
index 00000000000..e9551851f17
--- /dev/null
+++ b/usr.sbin/nsd/nsd-control.c
@@ -0,0 +1,415 @@
+/*
+ * nsd-control.c - remote control utility for nsd.
+ *
+ * Copyright (c) 2011, NLnet Labs. All rights reserved.
+ *
+ * This software is open source.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 
+ * Neither the name of the NLNET LABS nor the names of its contributors may
+ * be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * \file
+ *
+ * The remote control utility contacts the nsd server over ssl and
+ * sends the command, receives the answer, and displays the result
+ * from the commandline.
+ */
+
+#include "config.h"
+#ifdef HAVE_SSL
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <string.h>
+#ifdef HAVE_OPENSSL_SSL_H
+#include <openssl/ssl.h>
+#endif
+#ifdef HAVE_OPENSSL_ERR_H
+#include <openssl/err.h>
+#endif
+#ifdef HAVE_OPENSSL_RAND_H
+#include <openssl/rand.h>
+#endif
+#include "util.h"
+#include "tsig.h"
+#include "options.h"
+
+/** Give nsd-control usage, and exit (1). */
+static void
+usage()
+{
+	printf("Usage:	nsd-control [options] command\n");
+	printf("	Remote control utility for nsd server.\n");
+	printf("Version %s. Report bugs to <%s>.\n",
+		PACKAGE_VERSION, PACKAGE_BUGREPORT);
+	printf("Options:\n");
+	printf("  -c file	config file, default is %s\n", CONFIGFILE);
+	printf("  -s ip[@port]	server address, if omitted config is used.\n");
+	printf("  -h		show this usage help.\n");
+	printf("Commands:\n");
+	printf("  start				start server; runs nsd(8)\n");
+	printf("  stop				stops the server\n");
+	printf("  reload [<zone>]		reload modified zonefiles from disk\n");
+	printf("  reconfig			reload the config file\n");
+	printf("  repattern			the same as reconfig\n");
+	printf("  log_reopen			reopen logfile (for log rotate)\n");
+	printf("  status			display status of server\n");
+	printf("  stats				print statistics\n");
+	printf("  stats_noreset			peek at statistics\n");
+	printf("  addzone <name> <pattern>	add a new zone\n");
+	printf("  delzone <name>		remove a zone\n");
+	printf("  write [<zone>]		write changed zonefiles to disk\n");
+	printf("  notify [<zone>]		send NOTIFY messages to slave servers\n");
+	printf("  transfer [<zone>]		try to update slave zones to newer serial\n");
+	printf("  force_transfer [<zone>]	update slave zones with AXFR, no serial check\n");
+	printf("  zonestatus [<zone>]		print state, serial, activity\n");
+	printf("  serverpid			get pid of server process\n");
+	printf("  verbosity <number>		change logging detail\n");
+	exit(1);
+}
+
+/** exit with ssl error */
+static void ssl_err(const char* s)
+{
+	fprintf(stderr, "error: %s\n", s);
+	ERR_print_errors_fp(stderr);
+	exit(1);
+}
+
+/** setup SSL context */
+static SSL_CTX*
+setup_ctx(nsd_options_t* cfg)
+{
+	char* s_cert, *c_key, *c_cert;
+	SSL_CTX* ctx;
+
+	s_cert = cfg->server_cert_file;
+	c_key = cfg->control_key_file;
+	c_cert = cfg->control_cert_file;
+
+	/* filenames may be relative to zonesdir */
+	if (cfg->zonesdir && cfg->zonesdir[0] &&
+		(s_cert[0] != '/' || c_key[0] != '/' || c_cert[0] != '/')) {
+		if(chdir(cfg->zonesdir))
+			ssl_err("could not chdir to zonesdir");
+	}
+
+        ctx = SSL_CTX_new(SSLv23_client_method());
+	if(!ctx)
+		ssl_err("could not allocate SSL_CTX pointer");
+        if(!(SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) & SSL_OP_NO_SSLv2))
+		ssl_err("could not set SSL_OP_NO_SSLv2");
+	if(!SSL_CTX_use_certificate_file(ctx,c_cert,SSL_FILETYPE_PEM) ||
+		!SSL_CTX_use_PrivateKey_file(ctx,c_key,SSL_FILETYPE_PEM)
+		|| !SSL_CTX_check_private_key(ctx))
+		ssl_err("Error setting up SSL_CTX client key and cert");
+	if (SSL_CTX_load_verify_locations(ctx, s_cert, NULL) != 1)
+		ssl_err("Error setting up SSL_CTX verify, server cert");
+	SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
+
+	return ctx;
+}
+
+/** contact the server with TCP connect */
+static int
+contact_server(const char* svr, nsd_options_t* cfg, int statuscmd)
+{
+#ifdef INET6
+	struct sockaddr_storage addr;
+#else
+	struct sockaddr_in addr;
+#endif
+	socklen_t addrlen;
+	int fd;
+	int port = cfg->control_port;
+	/* use svr or a config entry */
+	if(!svr) {
+		if(cfg->control_interface)
+			svr = cfg->control_interface->address;
+		else	svr = "127.0.0.1";
+		/* config 0 addr (everything), means ask localhost */
+		if(strcmp(svr, "0.0.0.0") == 0)
+			svr = "127.0.0.1";
+		else if(strcmp(svr, "::0") == 0 ||
+			strcmp(svr, "0::0") == 0 ||
+			strcmp(svr, "0::") == 0 ||
+			strcmp(svr, "::") == 0)
+			svr = "::1";
+	}
+	if(strchr(svr, '@')) {
+		char* ps = strchr(svr, '@');
+		*ps++ = 0;
+		port = atoi(ps);
+		if(!port) {
+			fprintf(stderr, "could not parse port %s\n", ps);
+			exit(1);
+		}
+	} 
+        if(strchr(svr, ':')) {
+		struct sockaddr_in6 sa;
+		addrlen = (socklen_t)sizeof(struct sockaddr_in6);
+		memset(&sa, 0, addrlen);
+		sa.sin6_family = AF_INET6;
+		sa.sin6_port = (in_port_t)htons((uint16_t)port);
+		if(inet_pton((int)sa.sin6_family, svr, &sa.sin6_addr) <= 0) {
+			fprintf(stderr, "could not parse IP: %s\n", svr);
+			exit(1);
+		}
+		memcpy(&addr, &sa, addrlen);
+	} else { /* ip4 */
+		struct sockaddr_in sa;
+		addrlen = (socklen_t)sizeof(struct sockaddr_in);
+		memset(&sa, 0, addrlen);
+		sa.sin_family = AF_INET;
+		sa.sin_port = (in_port_t)htons((uint16_t)port);
+		if(inet_pton((int)sa.sin_family, svr, &sa.sin_addr) <= 0) {
+			fprintf(stderr, "could not parse IP: %s\n", svr);
+			exit(1);
+		}
+		memcpy(&addr, &sa, addrlen);
+	}
+
+	fd = socket(strchr(svr, ':')?AF_INET6:AF_INET, SOCK_STREAM, 0);
+	if(fd == -1) {
+		fprintf(stderr, "socket: %s\n", strerror(errno));
+		exit(1);
+	}
+	if(connect(fd, (struct sockaddr*)&addr, addrlen) < 0) {
+		fprintf(stderr, "error: connect (%s@%d): %s\n", svr, port,
+			strerror(errno));
+		if(errno == ECONNREFUSED && statuscmd) {
+			printf("nsd is stopped\n");
+			exit(3);
+		}
+		exit(1);
+	}
+	return fd;
+}
+
+/** setup SSL on the connection */
+static SSL*
+setup_ssl(SSL_CTX* ctx, int fd)
+{
+	SSL* ssl;
+	X509* x;
+	int r;
+
+	ssl = SSL_new(ctx);
+	if(!ssl)
+		ssl_err("could not SSL_new");
+	SSL_set_connect_state(ssl);
+	(void)SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
+	if(!SSL_set_fd(ssl, fd))
+		ssl_err("could not SSL_set_fd");
+	while(1) {
+		ERR_clear_error();
+		if( (r=SSL_do_handshake(ssl)) == 1)
+			break;
+		r = SSL_get_error(ssl, r);
+		if(r != SSL_ERROR_WANT_READ && r != SSL_ERROR_WANT_WRITE)
+			ssl_err("SSL handshake failed");
+		/* wants to be called again */
+	}
+
+	/* check authenticity of server */
+	if(SSL_get_verify_result(ssl) != X509_V_OK)
+		ssl_err("SSL verification failed");
+	x = SSL_get_peer_certificate(ssl);
+	if(!x)
+		ssl_err("Server presented no peer certificate");
+	X509_free(x);
+	return ssl;
+}
+
+/** send stdin to server */
+static void
+send_file(SSL* ssl, FILE* in, char* buf, size_t sz)
+{
+	while(fgets(buf, (int)sz, in)) {
+		if(SSL_write(ssl, buf, (int)strlen(buf)) <= 0)
+			ssl_err("could not SSL_write contents");
+	}
+}
+
+/** send command and display result */
+static int
+go_cmd(SSL* ssl, int argc, char* argv[])
+{
+	char pre[10];
+	const char* space=" ";
+	const char* newline="\n";
+	int was_error = 0, first_line = 1;
+	int r, i;
+	char buf[1024];
+	snprintf(pre, sizeof(pre), "NSDCT%d ", NSD_CONTROL_VERSION);
+	if(SSL_write(ssl, pre, (int)strlen(pre)) <= 0)
+		ssl_err("could not SSL_write");
+	for(i=0; i<argc; i++) {
+		if(SSL_write(ssl, space, (int)strlen(space)) <= 0)
+			ssl_err("could not SSL_write");
+		if(SSL_write(ssl, argv[i], (int)strlen(argv[i])) <= 0)
+			ssl_err("could not SSL_write");
+	}
+	if(SSL_write(ssl, newline, (int)strlen(newline)) <= 0)
+		ssl_err("could not SSL_write");
+
+	/* TODO remove or use file upload */
+	if(argc == 1 && strcmp(argv[0], "load_cache") == 0) {
+		send_file(ssl, stdin, buf, sizeof(buf));
+	}
+
+	while(1) {
+		ERR_clear_error();
+		if((r = SSL_read(ssl, buf, (int)sizeof(buf)-1)) <= 0) {
+			if(SSL_get_error(ssl, r) == SSL_ERROR_ZERO_RETURN) {
+				/* EOF */
+				break;
+			}
+			ssl_err("could not SSL_read");
+		}
+		buf[r] = 0;
+		printf("%s", buf);
+		if(first_line && strncmp(buf, "error", 5) == 0)
+			was_error = 1;
+		first_line = 0;
+	}
+	return was_error;
+}
+
+/** go ahead and read config, contact server and perform command and display */
+static int
+go(const char* cfgfile, char* svr, int argc, char* argv[])
+{
+	nsd_options_t* opt;
+	int fd, ret;
+	SSL_CTX* ctx;
+	SSL* ssl;
+
+	/* read config */
+	if(!(opt = nsd_options_create(region_create(xalloc, free)))) {
+		fprintf(stderr, "out of memory\n");
+		exit(1);
+	}
+	tsig_init(opt->region);
+	if(!parse_options_file(opt, cfgfile, NULL, NULL)) {
+		fprintf(stderr, "could not read config file\n");
+		exit(1);
+	}
+	if(!opt->control_enable)
+		fprintf(stderr, "warning: control-enable is 'no' in the config file.\n");
+	ctx = setup_ctx(opt);
+
+	/* contact server */
+	fd = contact_server(svr, opt, argc>0&&strcmp(argv[0],"status")==0);
+	ssl = setup_ssl(ctx, fd);
+
+	/* send command */
+	ret = go_cmd(ssl, argc, argv);
+
+	SSL_free(ssl);
+	close(fd);
+	SSL_CTX_free(ctx);
+	region_destroy(opt->region);
+	return ret;
+}
+
+/** getopt global, in case header files fail to declare it. */
+extern int optind;
+/** getopt global, in case header files fail to declare it. */
+extern char* optarg;
+
+/** Main routine for nsd-control */
+int main(int argc, char* argv[])
+{
+	int c;
+	const char* cfgfile = CONFIGFILE;
+	char* svr = NULL;
+#ifdef USE_WINSOCK
+	int r;
+	WSADATA wsa_data;
+#endif
+	log_init("nsd-control");
+
+	ERR_load_crypto_strings();
+	ERR_load_SSL_strings();
+	OpenSSL_add_all_algorithms();
+	(void)SSL_library_init();
+
+	if(!RAND_status()) {
+                /* try to seed it */
+                unsigned char buf[256];
+                unsigned int v, seed=(unsigned)time(NULL) ^ (unsigned)getpid();
+                size_t i;
+		v = seed;
+                for(i=0; i<256/sizeof(v); i++) {
+                        memmove(buf+i*sizeof(v), &v, sizeof(v));
+                        v = v*seed + (unsigned int)i;
+                }
+                RAND_seed(buf, 256);
+		fprintf(stderr, "warning: no entropy, seeding openssl PRNG with time\n");
+	}
+
+	/* parse the options */
+	while( (c=getopt(argc, argv, "c:s:h")) != -1) {
+		switch(c) {
+		case 'c':
+			cfgfile = optarg;
+			break;
+		case 's':
+			svr = optarg;
+			break;
+		case '?':
+		case 'h':
+		default:
+			usage();
+		}
+	}
+	argc -= optind;
+	argv += optind;
+	if(argc == 0)
+		usage();
+	if(argc >= 1 && strcmp(argv[0], "start")==0) {
+		if(execl(NSD_START_PATH, "nsd", "-c", cfgfile, 
+			(char*)NULL) < 0) {
+			fprintf(stderr, "could not exec %s: %s\n",
+				NSD_START_PATH, strerror(errno));
+			exit(1);
+		}
+	}
+
+	return go(cfgfile, svr, argc, argv);
+}
+
+#else /* HAVE_SSL */
+int main(void)
+{
+	printf("error: NSD was compiled without SSL.\n");
+	return 1;
+}
+#endif /* HAVE_SSL */