/* * 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 COPYRIGHT * HOLDER 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" #include #include #ifdef HAVE_SSL #include #include #include #ifdef HAVE_OPENSSL_SSL_H #include #endif #ifdef HAVE_OPENSSL_ERR_H #include #endif #ifdef HAVE_OPENSSL_RAND_H #include #endif #ifdef HAVE_SYS_UN_H #include #endif #include #ifndef AF_LOCAL #define AF_LOCAL AF_UNIX #endif #include "util.h" #include "tsig.h" #include "options.h" #include "zonec.h" static void usage(void) ATTR_NORETURN; static void ssl_err(const char* s) ATTR_NORETURN; static void ssl_path_err(const char* s, const char *path) ATTR_NORETURN; /** timeout to wait for connection over stream, in msec */ #define NSD_CONTROL_CONNECT_TIMEOUT 5000 int zonec_parse_string(region_type* ATTR_UNUSED(region), domain_table_type* ATTR_UNUSED(domains), zone_type* ATTR_UNUSED(zone), char* ATTR_UNUSED(str), domain_type** ATTR_UNUSED(parsed), int* ATTR_UNUSED(num_rrs)) { return 0; } /** 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 [] 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 add a new zone\n"); printf(" delzone remove a zone\n"); printf(" changezone change zone to use pattern\n"); printf(" addzones add zone list on stdin {name space pattern newline}\n"); printf(" delzones remove zone list on stdin {name newline}\n"); printf(" write [] write changed zonefiles to disk\n"); printf(" notify [] send NOTIFY messages to slave servers\n"); printf(" transfer [] try to update slave zones to newer serial\n"); printf(" force_transfer [] update slave zones with AXFR, no serial check\n"); printf(" zonestatus [] print state, serial, activity\n"); printf(" serverpid get pid of server process\n"); printf(" verbosity change logging detail\n"); printf(" print_tsig [] print tsig with the secret and algo\n"); printf(" update_tsig change existing tsig with to a new \n"); printf(" add_tsig [algo] add new key with the given parameters\n"); printf(" assoc_tsig associate with given tsig name\n"); printf(" del_tsig delete tsig from configuration\n"); printf(" add_cookie_secret add (or replace) a new cookie secret \n"); printf(" drop_cookie_secret drop a staging cookie secret\n"); printf(" activate_cookie_secret make a staging cookie secret active\n"); printf(" print_cookie_secrets show all cookie secrets with their status\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); } /** exit with ssl error related to a file path */ static void ssl_path_err(const char* s, const char *path) { unsigned long err; err = ERR_peek_error(); if (ERR_GET_LIB(err) == ERR_LIB_SYS) { fprintf(stderr, "error: %s\n%s: %s\n", s, path, ERR_reason_error_string(err)); exit(1); } else { ssl_err(s); } } /** setup SSL context */ static SSL_CTX* setup_ctx(struct nsd_options* cfg) { char* s_cert, *c_key, *c_cert; SSL_CTX* ctx; if(!options_remote_is_address(cfg)) return NULL; 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)) error("could not chdir to zonesdir: %s %s", cfg->zonesdir, strerror(errno)); } ctx = SSL_CTX_new(SSLv23_client_method()); if(!ctx) ssl_err("could not allocate SSL_CTX pointer"); #if SSL_OP_NO_SSLv2 != 0 if((SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) & SSL_OP_NO_SSLv2) != SSL_OP_NO_SSLv2) ssl_err("could not set SSL_OP_NO_SSLv2"); #endif if((SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv3) & SSL_OP_NO_SSLv3) != SSL_OP_NO_SSLv3) ssl_err("could not set SSL_OP_NO_SSLv3"); #if defined(SSL_OP_NO_RENEGOTIATION) /* disable client renegotiation */ if((SSL_CTX_set_options(ctx, SSL_OP_NO_RENEGOTIATION) & SSL_OP_NO_RENEGOTIATION) != SSL_OP_NO_RENEGOTIATION) ssl_err("could not set SSL_OP_NO_RENEGOTIATION"); #endif if(!SSL_CTX_use_certificate_file(ctx,c_cert,SSL_FILETYPE_PEM)) ssl_path_err("Error setting up SSL_CTX client cert", c_cert); if(!SSL_CTX_use_PrivateKey_file(ctx,c_key,SSL_FILETYPE_PEM)) ssl_path_err("Error setting up SSL_CTX client key", c_key); if(!SSL_CTX_check_private_key(ctx)) ssl_err("Error setting up SSL_CTX client key"); if (SSL_CTX_load_verify_locations(ctx, s_cert, NULL) != 1) ssl_path_err("Error setting up SSL_CTX verify, server cert", s_cert); SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL); return ctx; } /** check connect error */ static void checkconnecterr(int err, const char* svr, int port, int statuscmd) { if(!port) fprintf(stderr, "error: connect (%s): %s\n", svr, strerror(err)); else fprintf(stderr, "error: connect (%s@%d): %s\n", svr, port, strerror(err)); if(err == ECONNREFUSED && statuscmd) { printf("nsd is stopped\n"); exit(3); } exit(1); } /** contact the server with TCP connect */ static int contact_server(const char* svr, struct nsd_options* 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; int addrfamily = 0; /* use svr or a config entry */ if(!svr) { if(cfg->control_interface) { svr = cfg->control_interface->address; } else if(cfg->do_ip4) { svr = "127.0.0.1"; } else { svr = "::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(svr[0] == '/') { #ifdef HAVE_SYS_UN_H struct sockaddr_un* usock = (struct sockaddr_un *) &addr; usock->sun_family = AF_LOCAL; #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN usock->sun_len = (unsigned)sizeof(usock); #endif (void)strlcpy(usock->sun_path, svr, sizeof(usock->sun_path)); addrlen = (socklen_t)sizeof(struct sockaddr_un); addrfamily = AF_LOCAL; port = 0; #endif #ifdef INET6 } else 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); addrfamily = AF_INET6; #endif } 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); addrfamily = AF_INET; } fd = socket(addrfamily, SOCK_STREAM, 0); if(fd == -1) { fprintf(stderr, "socket: %s\n", strerror(errno)); exit(1); } if(fcntl(fd, F_SETFL, O_NONBLOCK) == -1) { fprintf(stderr, "error: set nonblocking: fcntl: %s", strerror(errno)); } if(connect(fd, (struct sockaddr*)&addr, addrlen) < 0) { if(errno != EINPROGRESS) { checkconnecterr(errno, svr, port, statuscmd); } } while(1) { fd_set rset, wset, eset; struct timeval tv; FD_ZERO(&rset); FD_SET(fd, &rset); FD_ZERO(&wset); FD_SET(fd, &wset); FD_ZERO(&eset); FD_SET(fd, &eset); tv.tv_sec = NSD_CONTROL_CONNECT_TIMEOUT/1000; tv.tv_usec= (NSD_CONTROL_CONNECT_TIMEOUT%1000)*1000; if(select(fd+1, &rset, &wset, &eset, &tv) == -1) { fprintf(stderr, "select: %s\n", strerror(errno)); exit(1); } if(!FD_ISSET(fd, &rset) && !FD_ISSET(fd, &wset) && !FD_ISSET(fd, &eset)) { fprintf(stderr, "timeout: could not connect to server\n"); exit(1); } else { /* check nonblocking connect error */ int error = 0; socklen_t len = (socklen_t)sizeof(error); if(getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&error, &len) < 0) { error = errno; /* on solaris errno is error */ } if(error != 0) { if(error == EINPROGRESS || error == EWOULDBLOCK) continue; /* try again later */ checkconnecterr(error, svr, port, statuscmd); } } break; } if(fcntl(fd, F_SETFL, 0) == -1) { fprintf(stderr, "error: set blocking: fcntl: %s", strerror(errno)); } return fd; } /** setup SSL on the connection */ static SSL* setup_ssl(SSL_CTX* ctx, int fd) { SSL* ssl; X509* x; int r; if(!ctx) return NULL; 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; } /** read from ssl or fd, fatalexit on error, 0 EOF, 1 success */ static int remote_read(SSL* ssl, int fd, char* buf, size_t len) { if(ssl) { int r; ERR_clear_error(); if((r = SSL_read(ssl, buf, (int)len-1)) <= 0) { if(SSL_get_error(ssl, r) == SSL_ERROR_ZERO_RETURN) { /* EOF */ return 0; } ssl_err("could not SSL_read"); } buf[r] = 0; } else { ssize_t rr = read(fd, buf, len-1); if(rr <= 0) { if(rr == 0) { /* EOF */ return 0; } fprintf(stderr, "could not read: %s\n", strerror(errno)); exit(1); } buf[rr] = 0; } return 1; } /** write to ssl or fd, fatalexit on error */ static void remote_write(SSL* ssl, int fd, const char* buf, size_t len) { if(ssl) { if(SSL_write(ssl, buf, (int)len) <= 0) ssl_err("could not SSL_write"); } else { if(write(fd, buf, len) < (ssize_t)len) { fprintf(stderr, "could not write: %s\n", strerror(errno)); exit(1); } } } /** send stdin to server */ static void send_file(SSL* ssl, int fd, FILE* in, char* buf, size_t sz) { char e[] = {0x04, 0x0a}; while(fgets(buf, (int)sz, in)) { remote_write(ssl, fd, buf, strlen(buf)); } /* send end-of-file marker */ remote_write(ssl, fd, e, sizeof(e)); } /** send command and display result */ static int go_cmd(SSL* ssl, int fd, int argc, char* argv[]) { char pre[10]; const char* space=" "; const char* newline="\n"; int was_error = 0, first_line = 1; int i; char buf[1024]; snprintf(pre, sizeof(pre), "NSDCT%d ", NSD_CONTROL_VERSION); remote_write(ssl, fd, pre, strlen(pre)); for(i=0; iregion); 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"); resolve_interface_names(opt); 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, fd, argc, argv); if(ssl) SSL_free(ssl); close(fd); if(ctx) 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; log_init("nsd-control"); #ifdef HAVE_ERR_LOAD_CRYPTO_STRINGS ERR_load_crypto_strings(); #endif #if defined(HAVE_ERR_LOAD_SSL_STRINGS) && !defined(DEPRECATED_ERR_LOAD_SSL_STRINGS) ERR_load_SSL_strings(); #endif #if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_CRYPTO) OpenSSL_add_all_algorithms(); #else OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS | OPENSSL_INIT_ADD_ALL_DIGESTS | OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL); #endif #if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_SSL) (void)SSL_library_init(); #else OPENSSL_init_ssl(0, NULL); #endif 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) { const char *path; if((path = getenv("NSD_PATH")) == NULL) { path = NSD_START_PATH; } if(execl(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 */