/* tincctl.c -- Controlling a running tincd Copyright (C) 2007-2012 Guus Sliepen This program is free software; you can redistribute it 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. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "system.h" #include #include "xalloc.h" #include "protocol.h" #include "control_common.h" #include "ecdsagen.h" #include "info.h" #include "rsagen.h" #include "utils.h" #include "tincctl.h" #include "top.h" #ifdef HAVE_MINGW #define mkdir(a, b) mkdir(a) #endif /* The name this program was run with. */ static char *program_name = NULL; /* If nonzero, display usage information and exit. */ static bool show_help = false; /* If nonzero, print the version on standard output and exit. */ static bool show_version = false; static char *name = NULL; static char *identname = NULL; /* program name for syslog */ static char *pidfilename = NULL; /* pid file location */ static char controlcookie[1024]; char *netname = NULL; char *confbase = NULL; static char *tinc_conf = NULL; static char *hosts_dir = NULL; // Horrible global variables... static int pid = 0; static int fd = -1; static char line[4096]; static int code; static int req; static int result; static bool force = false; #ifdef HAVE_MINGW static struct WSAData wsa_state; #endif static struct option const long_options[] = { {"config", required_argument, NULL, 'c'}, {"debug", optional_argument, NULL, 0}, {"no-detach", no_argument, NULL, 0}, {"mlock", no_argument, NULL, 0}, {"net", required_argument, NULL, 'n'}, {"help", no_argument, NULL, 1}, {"version", no_argument, NULL, 2}, {"pidfile", required_argument, NULL, 5}, {"logfile", required_argument, NULL, 0}, {"bypass-security", no_argument, NULL, 0}, {"chroot", no_argument, NULL, 0}, {"user", required_argument, NULL, 0}, {"option", required_argument, NULL, 0}, {"force", no_argument, NULL, 6}, {NULL, 0, NULL, 0} }; static void version(void) { printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE, VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR); printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n" "See the AUTHORS file for a complete list.\n\n" "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n" "and you are welcome to redistribute it under certain conditions;\n" "see the file COPYING for details.\n"); } static void usage(bool status) { if(status) fprintf(stderr, "Try `%s --help\' for more information.\n", program_name); else { printf("Usage: %s [options] command\n\n", program_name); printf("Valid options are:\n" " -c, --config=DIR Read configuration options from DIR.\n" " -n, --net=NETNAME Connect to net NETNAME.\n" " --pidfile=FILENAME Read control cookie from FILENAME.\n" " --help Display this help and exit.\n" " --version Output version information and exit.\n" "\n" "Valid commands are:\n" " init [name] Create initial configuration files.\n" " config Change configuration:\n" " [set] VARIABLE VALUE - set VARIABLE to VALUE\n" " add VARIABLE VALUE - add VARIABLE with the given VALUE\n" " del VARIABLE [VALUE] - remove VARIABLE [only ones with watching VALUE]\n" " start [tincd options] Start tincd.\n" " stop Stop tincd.\n" " restart Restart tincd.\n" " reload Partially reload configuration of running tincd.\n" " pid Show PID of currently running tincd.\n" " generate-keys [bits] Generate new RSA and ECDSA public/private keypairs.\n" " generate-rsa-keys [bits] Generate a new RSA public/private keypair.\n" " generate-ecdsa-keys Generate a new ECDSA public/private keypair.\n" " dump Dump a list of one of the following things:\n" " nodes - all known nodes in the VPN\n" " edges - all known connections in the VPN\n" " subnets - all known subnets in the VPN\n" " connections - all meta connections with ourself\n" " graph - graph of the VPN in dotty format\n" " info NODE|SUBNET|ADDRESS Give information about a particular NODE, SUBNET or ADDRESS.\n" " purge Purge unreachable nodes\n" " debug N Set debug level\n" " retry Retry all outgoing connections\n" " disconnect NODE Close meta connection with NODE\n" #ifdef HAVE_CURSES " top Show real-time statistics\n" #endif " pcap [snaplen] Dump traffic in pcap format [up to snaplen bytes per packet]\n" " log [level] Dump log output [up to the specified level]\n" " export Export host configuration of local node to standard output\n" " export-all Export all host configuration files to standard output\n" " import [--force] Import host configuration file(s) from standard input\n" "\n"); printf("Report bugs to tinc@tinc-vpn.org.\n"); } } static bool parse_options(int argc, char **argv) { int r; int option_index = 0; while((r = getopt_long(argc, argv, "c:n:Dd::Lo:RU:", long_options, &option_index)) != EOF) { switch (r) { case 0: /* long option */ break; case 'c': /* config file */ confbase = xstrdup(optarg); break; case 'n': /* net name given */ netname = xstrdup(optarg); break; case 1: /* show help */ show_help = true; break; case 2: /* show version */ show_version = true; break; case 5: /* open control socket here */ pidfilename = xstrdup(optarg); break; case 6: force = true; break; case '?': usage(true); return false; default: break; } } if(!netname && (netname = getenv("NETNAME"))) netname = xstrdup(netname); /* netname "." is special: a "top-level name" */ if(!strcmp(netname, ".")) { free(netname); netname = NULL; } return true; } static FILE *ask_and_open(const char *filename, const char *what, const char *mode) { FILE *r; char *directory; char buf[PATH_MAX]; char buf2[PATH_MAX]; /* Check stdin and stdout */ if(isatty(0) && isatty(1)) { /* Ask for a file and/or directory name. */ fprintf(stdout, "Please enter a file to save %s to [%s]: ", what, filename); fflush(stdout); if(fgets(buf, sizeof buf, stdin) == NULL) { fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno)); return NULL; } size_t len = strlen(buf); if(len) buf[--len] = 0; if(len) filename = buf; } #ifdef HAVE_MINGW if(filename[0] != '\\' && filename[0] != '/' && !strchr(filename, ':')) { #else if(filename[0] != '/') { #endif /* The directory is a relative path or a filename. */ directory = get_current_dir_name(); snprintf(buf2, sizeof buf2, "%s/%s", directory, filename); filename = buf2; } umask(0077); /* Disallow everything for group and other */ /* Open it first to keep the inode busy */ r = fopen(filename, mode); if(!r) { fprintf(stderr, "Error opening file `%s': %s\n", filename, strerror(errno)); return NULL; } return r; } /* Generate a public/private ECDSA keypair, and ask for a file to store them in. */ static bool ecdsa_keygen() { ecdsa_t key; FILE *f; char *filename; fprintf(stderr, "Generating ECDSA keypair:\n"); if(!ecdsa_generate(&key)) { fprintf(stderr, "Error during key generation!\n"); return false; } else fprintf(stderr, "Done.\n"); xasprintf(&filename, "%s/ecdsa_key.priv", confbase); f = ask_and_open(filename, "private ECDSA key", "a"); if(!f) return false; #ifdef HAVE_FCHMOD /* Make it unreadable for others. */ fchmod(fileno(f), 0600); #endif if(ftell(f)) fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n"); ecdsa_write_pem_private_key(&key, f); fclose(f); free(filename); if(name) xasprintf(&filename, "%s/hosts/%s", confbase, name); else xasprintf(&filename, "%s/ecdsa_key.pub", confbase); f = ask_and_open(filename, "public ECDSA key", "a"); if(!f) return false; if(ftell(f)) fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n"); char *pubkey = ecdsa_get_base64_public_key(&key); fprintf(f, "ECDSAPublicKey = %s\n", pubkey); free(pubkey); fclose(f); free(filename); return true; } /* Generate a public/private RSA keypair, and ask for a file to store them in. */ static bool rsa_keygen(int bits) { rsa_t key; FILE *f; char *filename; fprintf(stderr, "Generating %d bits keys:\n", bits); if(!rsa_generate(&key, bits, 0x10001)) { fprintf(stderr, "Error during key generation!\n"); return false; } else fprintf(stderr, "Done.\n"); xasprintf(&filename, "%s/rsa_key.priv", confbase); f = ask_and_open(filename, "private RSA key", "a"); if(!f) return false; #ifdef HAVE_FCHMOD /* Make it unreadable for others. */ fchmod(fileno(f), 0600); #endif if(ftell(f)) fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n"); rsa_write_pem_private_key(&key, f); fclose(f); free(filename); if(name) xasprintf(&filename, "%s/hosts/%s", confbase, name); else xasprintf(&filename, "%s/rsa_key.pub", confbase); f = ask_and_open(filename, "public RSA key", "a"); if(!f) return false; if(ftell(f)) fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n"); rsa_write_pem_public_key(&key, f); fclose(f); free(filename); return true; } /* Set all files and paths according to netname */ static void make_names(void) { #ifdef HAVE_MINGW HKEY key; char installdir[1024] = ""; long len = sizeof installdir; #endif if(netname) xasprintf(&identname, "tinc.%s", netname); else identname = xstrdup("tinc"); #ifdef HAVE_MINGW if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) { if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) { if(!confbase) { if(netname) xasprintf(&confbase, "%s/%s", installdir, netname); else xasprintf(&confbase, "%s", installdir); } } if(!pidfilename) xasprintf(&pidfilename, "%s/pid", confbase); RegCloseKey(key); } if(!*installdir) { #endif if(!pidfilename) xasprintf(&pidfilename, "%s/run/%s.pid", LOCALSTATEDIR, identname); if(netname) { if(!confbase) xasprintf(&confbase, CONFDIR "/tinc/%s", netname); else fprintf(stderr, "Both netname and configuration directory given, using the latter...\n"); } else { if(!confbase) xasprintf(&confbase, CONFDIR "/tinc"); } #ifdef HAVE_MINGW } #endif xasprintf(&tinc_conf, "%s/tinc.conf", confbase); xasprintf(&hosts_dir, "%s/hosts", confbase); } static char buffer[4096]; static size_t blen = 0; bool recvline(int fd, char *line, size_t len) { char *newline = NULL; while(!(newline = memchr(buffer, '\n', blen))) { int result = recv(fd, buffer + blen, sizeof buffer - blen, 0); if(result == -1 && errno == EINTR) continue; else if(result <= 0) return false; blen += result; } if(newline - buffer >= len) return false; len = newline - buffer; memcpy(line, buffer, len); line[len] = 0; memmove(buffer, newline + 1, blen - len - 1); blen -= len + 1; return true; } static bool recvdata(int fd, char *data, size_t len) { while(blen < len) { int result = recv(fd, buffer + blen, sizeof buffer - blen, 0); if(result == -1 && errno == EINTR) continue; else if(result <= 0) return false; blen += result; } memcpy(data, buffer, len); memmove(buffer, buffer + len, blen - len); blen -= len; return true; } bool sendline(int fd, char *format, ...) { static char buffer[4096]; char *p = buffer; int blen = 0; va_list ap; va_start(ap, format); blen = vsnprintf(buffer, sizeof buffer, format, ap); va_end(ap); if(blen < 1 || blen >= sizeof buffer) return false; buffer[blen] = '\n'; blen++; while(blen) { int result = send(fd, p, blen, 0); if(result == -1 && errno == EINTR) continue; else if(result <= 0) return false; p += result; blen -= result; } return true; } static void pcap(int fd, FILE *out, int snaplen) { sendline(fd, "%d %d %d", CONTROL, REQ_PCAP, snaplen); char data[9018]; struct { uint32_t magic; uint16_t major; uint16_t minor; uint32_t tz_offset; uint32_t tz_accuracy; uint32_t snaplen; uint32_t ll_type; } header = { 0xa1b2c3d4, 2, 4, 0, 0, snaplen ?: sizeof data, 1, }; struct { uint32_t tv_sec; uint32_t tv_usec; uint32_t len; uint32_t origlen; } packet; struct timeval tv; fwrite(&header, sizeof header, 1, out); fflush(out); char line[32]; while(recvline(fd, line, sizeof line)) { int code, req, len; int n = sscanf(line, "%d %d %d", &code, &req, &len); gettimeofday(&tv, NULL); if(n != 3 || code != CONTROL || req != REQ_PCAP || len < 0 || len > sizeof data) break; if(!recvdata(fd, data, len)) break; packet.tv_sec = tv.tv_sec; packet.tv_usec = tv.tv_usec; packet.len = len; packet.origlen = len; fwrite(&packet, sizeof packet, 1, out); fwrite(data, len, 1, out); fflush(out); } } static void logcontrol(int fd, FILE *out, int level) { sendline(fd, "%d %d %d", CONTROL, REQ_LOG, level); char data[1024]; char line[32]; while(recvline(fd, line, sizeof line)) { int code, req, len; int n = sscanf(line, "%d %d %d", &code, &req, &len); if(n != 3 || code != CONTROL || req != REQ_LOG || len < 0 || len > sizeof data) break; if(!recvdata(fd, data, len)) break; fwrite(data, len, 1, out); fputc('\n', out); fflush(out); } } #ifdef HAVE_MINGW static bool remove_service(void) { SC_HANDLE manager = NULL; SC_HANDLE service = NULL; SERVICE_STATUS status = {0}; manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS); if(!manager) { fprintf(stderr, "Could not open service manager: %s\n", winerror(GetLastError())); return false; } service = OpenService(manager, identname, SERVICE_ALL_ACCESS); if(!service) { fprintf(stderr, "Could not open %s service: %s\n", identname, winerror(GetLastError())); return false; } if(!ControlService(service, SERVICE_CONTROL_STOP, &status)) fprintf(stderr, "Could not stop %s service: %s\n", identname, winerror(GetLastError())); else fprintf(stderr, "%s service stopped\n", identname); if(!DeleteService(service)) { fprintf(stderr, "Could not remove %s service: %s\n", identname, winerror(GetLastError())); return false; } fprintf(stderr, "%s service removed\n", identname); return true; } #endif static bool connect_tincd() { if(fd >= 0) return true; FILE *f = fopen(pidfilename, "r"); if(!f) { fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno)); return false; } char host[128]; char port[128]; if(fscanf(f, "%20d %1024s %128s port %128s", &pid, controlcookie, host, port) != 4) { fprintf(stderr, "Could not parse pid file %s\n", pidfilename); return false; } #ifdef HAVE_MINGW if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) { fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError())); return false; } #endif struct addrinfo hints = { .ai_family = AF_UNSPEC, .ai_socktype = SOCK_STREAM, .ai_protocol = IPPROTO_TCP, .ai_flags = 0, }; struct addrinfo *res = NULL; if(getaddrinfo(host, port, &hints, &res) || !res) { fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, strerror(errno)); return false; } fd = socket(res->ai_family, SOCK_STREAM, IPPROTO_TCP); if(fd < 0) { fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno)); return false; } #ifdef HAVE_MINGW unsigned long arg = 0; if(ioctlsocket(fd, FIONBIO, &arg) != 0) { fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno)); } #endif if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) { fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno)); return false; } freeaddrinfo(res); char data[4096]; int version; if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %s %d", &code, data, &version) != 3 || code != 0) { fprintf(stderr, "Cannot read greeting from control socket: %s\n", sockstrerror(sockerrno)); return false; } sendline(fd, "%d ^%s %d", ID, controlcookie, TINC_CTL_VERSION_CURRENT); if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &version, &pid) != 3 || code != 4 || version != TINC_CTL_VERSION_CURRENT) { fprintf(stderr, "Could not fully establish control socket connection\n"); return false; } return true; } static int cmd_start(int argc, char *argv[]) { int i, j; char *c; argc += optind; argv -= optind; char *slash = strrchr(argv[0], '/'); #ifdef HAVE_MINGW if ((c = strrchr(argv[0], '\\')) > slash) slash = c; #endif if (slash++) xasprintf(&c, "%.*stincd", (int)(slash - argv[0]), argv[0]); else c = "tincd"; argv[0] = c; for(i = j = 1; argv[i]; ++i) if (i != optind && strcmp(argv[i], "--") != 0) argv[j++] = argv[i]; argv[j] = NULL; execvp(c, argv); fprintf(stderr, "Could not start %s: %s\n", c, strerror(errno)); return 1; } static int cmd_stop(int argc, char *argv[]) { #ifndef HAVE_MINGW if(!connect_tincd()) return 1; sendline(fd, "%d %d", CONTROL, REQ_STOP); if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_STOP || result) { fprintf(stderr, "Could not stop tinc daemon.\n"); return 1; } #else if(!remove_service()) return 1; #endif return 0; } static int cmd_restart(int argc, char *argv[]) { return cmd_stop(argc, argv) ?: cmd_start(argc, argv); } static int cmd_reload(int argc, char *argv[]) { if(!connect_tincd()) return 1; sendline(fd, "%d %d", CONTROL, REQ_RELOAD); if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RELOAD || result) { fprintf(stderr, "Could not reload configuration.\n"); return 1; } return 0; } static int cmd_dump(int argc, char *argv[]) { if(argc != 2) { fprintf(stderr, "Invalid number of arguments.\n"); usage(true); return 1; } if(!connect_tincd()) return 1; bool do_graph = false; if(!strcasecmp(argv[1], "nodes")) sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES); else if(!strcasecmp(argv[1], "edges")) sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES); else if(!strcasecmp(argv[1], "subnets")) sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS); else if(!strcasecmp(argv[1], "connections")) sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS); else if(!strcasecmp(argv[1], "graph")) { sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES); sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES); do_graph = true; } else { fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]); usage(true); return 1; } if(do_graph) printf("digraph {\n"); while(recvline(fd, line, sizeof line)) { char node1[4096], node2[4096]; int n = sscanf(line, "%d %d %s to %s", &code, &req, node1, node2); if(n == 2) { if(do_graph && req == REQ_DUMP_NODES) continue; else { if(do_graph) printf("}\n"); return 0; } } if(n < 2) break; if(!do_graph) printf("%s\n", line + 5); else { if(req == REQ_DUMP_NODES) printf(" %s [label = \"%s\"];\n", node1, node1); else printf(" %s -> %s;\n", node1, node2); } } fprintf(stderr, "Error receiving dump.\n"); return 1; } static int cmd_purge(int argc, char *argv[]) { if(!connect_tincd()) return 1; sendline(fd, "%d %d", CONTROL, REQ_PURGE); if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_PURGE || result) { fprintf(stderr, "Could not purge old information.\n"); return 1; } return 0; } static int cmd_debug(int argc, char *argv[]) { if(argc != 2) { fprintf(stderr, "Invalid number of arguments.\n"); return 1; } if(!connect_tincd()) return 1; int debuglevel = atoi(argv[1]); int origlevel; sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel); if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &origlevel) != 3 || code != CONTROL || req != REQ_SET_DEBUG) { fprintf(stderr, "Could not set debug level.\n"); return 1; } fprintf(stderr, "Old level %d, new level %d.\n", origlevel, debuglevel); return 0; } static int cmd_retry(int argc, char *argv[]) { if(!connect_tincd()) return 1; sendline(fd, "%d %d", CONTROL, REQ_RETRY); if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RETRY || result) { fprintf(stderr, "Could not retry outgoing connections.\n"); return 1; } return 0; } static int cmd_connect(int argc, char *argv[]) { if(argc != 2) { fprintf(stderr, "Invalid number of arguments.\n"); return 1; } if(!check_id(argv[2])) { fprintf(stderr, "Invalid name for node.\n"); return 1; } if(!connect_tincd()) return 1; sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, argv[1]); if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_CONNECT || result) { fprintf(stderr, "Could not connect to %s.\n", argv[1]); return 1; } return 0; } static int cmd_disconnect(int argc, char *argv[]) { if(argc != 2) { fprintf(stderr, "Invalid number of arguments.\n"); return 1; } if(!check_id(argv[2])) { fprintf(stderr, "Invalid name for node.\n"); return 1; } if(!connect_tincd()) return 1; sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, argv[1]); if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_DISCONNECT || result) { fprintf(stderr, "Could not disconnect %s.\n", argv[1]); return 1; } return 0; } static int cmd_top(int argc, char *argv[]) { #ifdef HAVE_CURSES if(!connect_tincd()) return 1; top(fd); return 0; #else fprintf(stderr, "This version of tincctl was compiled without support for the curses library.\n"); return 1; #endif } static int cmd_pcap(int argc, char *argv[]) { if(!connect_tincd()) return 1; pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0); return 0; } static int cmd_log(int argc, char *argv[]) { if(!connect_tincd()) return 1; logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1); return 0; } static int cmd_pid(int argc, char *argv[]) { if(!connect_tincd()) return 1; printf("%d\n", pid); return 0; } static int rstrip(char *value) { int len = strlen(value); while(len && strchr("\t\r\n ", value[len - 1])) value[--len] = 0; return len; } static char *get_my_name() { FILE *f = fopen(tinc_conf, "r"); if(!f) { fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno)); return NULL; } char buf[4096]; char *value; while(fgets(buf, sizeof buf, f)) { int len = strcspn(buf, "\t ="); value = buf + len; value += strspn(value, "\t "); if(*value == '=') { value++; value += strspn(value, "\t "); } if(!rstrip(value)) continue; buf[len] = 0; if(strcasecmp(buf, "Name")) continue; if(*value) { fclose(f); return strdup(value); } } fclose(f); fprintf(stderr, "Could not find Name in %s.\n", tinc_conf); return NULL; } #define VAR_SERVER 1 /* Should be in tinc.conf */ #define VAR_HOST 2 /* Can be in host config file */ #define VAR_MULTIPLE 4 /* Multiple statements allowed */ #define VAR_OBSOLETE 8 /* Should not be used anymore */ static struct { const char *name; int type; } const variables[] = { /* Server configuration */ {"AddressFamily", VAR_SERVER}, {"BindToAddress", VAR_SERVER | VAR_MULTIPLE}, {"BindToInterface", VAR_SERVER}, {"Broadcast", VAR_SERVER}, {"ConnectTo", VAR_SERVER | VAR_MULTIPLE}, {"DecrementTTL", VAR_SERVER}, {"Device", VAR_SERVER}, {"DeviceType", VAR_SERVER}, {"DirectOnly", VAR_SERVER}, {"ECDSAPrivateKeyFile", VAR_SERVER}, {"ExperimentalProtocol", VAR_SERVER}, {"Forwarding", VAR_SERVER}, {"GraphDumpFile", VAR_SERVER}, {"Hostnames", VAR_SERVER}, {"IffOneQueue", VAR_SERVER}, {"Interface", VAR_SERVER}, {"KeyExpire", VAR_SERVER}, {"LocalDiscovery", VAR_SERVER}, {"MACExpire", VAR_SERVER}, {"MaxTimeout", VAR_SERVER}, {"Mode", VAR_SERVER}, {"Name", VAR_SERVER}, {"PingInterval", VAR_SERVER}, {"PingTimeout", VAR_SERVER}, {"PriorityInheritance", VAR_SERVER}, {"PrivateKey", VAR_SERVER | VAR_OBSOLETE}, {"PrivateKeyFile", VAR_SERVER}, {"ProcessPriority", VAR_SERVER}, {"ReplayWindow", VAR_SERVER}, {"StrictSubnets", VAR_SERVER}, {"TunnelServer", VAR_SERVER}, {"UDPRcvBuf", VAR_SERVER}, {"UDPSndBuf", VAR_SERVER}, /* Host configuration */ {"Address", VAR_HOST | VAR_MULTIPLE}, {"Cipher", VAR_SERVER | VAR_HOST}, {"ClampMSS", VAR_SERVER | VAR_HOST}, {"Compression", VAR_SERVER | VAR_HOST}, {"Digest", VAR_SERVER | VAR_HOST}, {"IndirectData", VAR_SERVER | VAR_HOST}, {"MACLength", VAR_SERVER | VAR_HOST}, {"PMTU", VAR_SERVER | VAR_HOST}, {"PMTUDiscovery", VAR_SERVER | VAR_HOST}, {"Port", VAR_HOST}, {"PublicKey", VAR_SERVER | VAR_HOST | VAR_OBSOLETE}, {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE}, {"Subnet", VAR_HOST | VAR_MULTIPLE}, {"TCPOnly", VAR_SERVER | VAR_HOST}, {NULL, 0} }; static int cmd_config(int argc, char *argv[]) { if(argc < 2) { fprintf(stderr, "Invalid number of arguments.\n"); return 1; } int action = 0; if(!strcasecmp(argv[1], "add")) { argv++, argc--, action = 1; } else if(!strcasecmp(argv[1], "del")) { argv++, argc--, action = -1; } else if(!strcasecmp(argv[1], "replace") || !strcasecmp(argv[1], "set") || !strcasecmp(argv[1], "change")) { argv++, argc--, action = 0; } if(argc < 2) { fprintf(stderr, "Invalid number of arguments.\n"); return 1; } // Concatenate the rest of the command line strncpy(line, argv[1], sizeof line - 1); for(int i = 2; i < argc; i++) { strncat(line, " ", sizeof line - 1 - strlen(line)); strncat(line, argv[i], sizeof line - 1 - strlen(line)); } // Liberal parsing into node name, variable name and value. char *node = NULL; char *variable; char *value; int len; len = strcspn(line, "\t ="); value = line + len; value += strspn(value, "\t "); if(*value == '=') { value++; value += strspn(value, "\t "); } line[len] = '\0'; variable = strchr(line, '.'); if(variable) { node = line; *variable++ = 0; } else { variable = line; } if(!*variable) { fprintf(stderr, "No variable given.\n"); return 1; } if(action >= 0 && !*value) { fprintf(stderr, "No value for variable given.\n"); return 1; } /* Some simple checks. */ bool found = false; for(int i = 0; variables[i].name; i++) { if(strcasecmp(variables[i].name, variable)) continue; found = true; variable = (char *)variables[i].name; /* Discourage use of obsolete variables. */ if(variables[i].type & VAR_OBSOLETE && action >= 0) { if(force) { fprintf(stderr, "Warning: %s is an obsolete variable!\n", variable); } else { fprintf(stderr, "%s is an obsolete variable! Use --force to use it anyway.\n", variable); return 1; } } /* Don't put server variables in host config files */ if(node && !(variables[i].type & VAR_HOST) && action >= 0) { if(force) { fprintf(stderr, "Warning: %s is not a host configuration variable!\n", variable); } else { fprintf(stderr, "%s is not a host configuration variable! Use --force to use it anyway.\n", variable); return 1; } } /* Should this go into our own host config file? */ if(!node && !(variables[i].type & VAR_SERVER)) { node = get_my_name(); if(!node) return 1; } break; } if(node && !check_id(node)) { fprintf(stderr, "Invalid name for node.\n"); return 1; } if(!found && action >= 0) { if(force) { fprintf(stderr, "Warning: %s is not a known configuration variable!\n", variable); } else { fprintf(stderr, "%s: is not a known configuration variable! Use --force to use it anyway.\n", variable); return 1; } } // Open the right configuration file. char *filename; if(node) xasprintf(&filename, "%s/%s", hosts_dir, node); else filename = tinc_conf; FILE *f = fopen(filename, "r"); if(!f) { if(action < 0 || errno != ENOENT) { fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno)); return 1; } // If it doesn't exist, create it. f = fopen(filename, "a+"); if(!f) { fprintf(stderr, "Could not create configuration file %s: %s\n", filename, strerror(errno)); return 1; } else { fprintf(stderr, "Created configuration file %s.\n", filename); } } char *tmpfile; xasprintf(&tmpfile, "%s.config.tmp", filename); FILE *tf = fopen(tmpfile, "w"); if(!tf) { fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno)); return 1; } // Copy the file, making modifications on the fly. char buf1[4096]; char buf2[4096]; bool set = false; bool removed = false; while(fgets(buf1, sizeof buf1, f)) { buf1[sizeof buf1 - 1] = 0; strncpy(buf2, buf1, sizeof buf2); // Parse line in a simple way char *bvalue; int len; len = strcspn(buf2, "\t ="); bvalue = buf2 + len; bvalue += strspn(bvalue, "\t "); if(*bvalue == '=') { bvalue++; bvalue += strspn(bvalue, "\t "); } rstrip(bvalue); buf2[len] = '\0'; // Did it match? if(!strcasecmp(buf2, variable)) { // Del if(action < 0) { if(!*value || !strcasecmp(bvalue, value)) { removed = true; continue; } // Set } else if(action == 0) { // Already set? Delete the rest... if(set) continue; // Otherwise, replace. if(fprintf(tf, "%s = %s\n", variable, value) < 0) { fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno)); return 1; } set = true; continue; } } // Copy original line... if(fputs(buf1, tf) < 0) { fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno)); return 1; } // Add newline if it is missing... if(*buf1 && buf1[strlen(buf1) - 1] != '\n') { if(fputc('\n', tf) < 0) { fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno)); return 1; } } } // Make sure we read everything... if(ferror(f) || !feof(f)) { fprintf(stderr, "Error while reading from configuration file %s: %s\n", filename, strerror(errno)); return 1; } if(fclose(f)) { fprintf(stderr, "Error closing configuration file %s: %s\n", filename, strerror(errno)); return 1; } // Add new variable if necessary. if(action > 0 || (action == 0 && !set)) { if(fprintf(tf, "%s = %s\n", variable, value) < 0) { fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno)); return 1; } } // Make sure we wrote everything... if(fclose(tf)) { fprintf(stderr, "Error closing temporary file %s: %s\n", tmpfile, strerror(errno)); return 1; } // Could we find what we had to remove? if(action < 0 && !removed) { remove(tmpfile); fprintf(stderr, "No configuration variables deleted.\n"); return *value; } // Replace the configuration file with the new one #ifdef HAVE_MINGW if(remove(filename)) { fprintf(stderr, "Error replacing file %s: %s\n", filename, strerror(errno)); return 1; } #endif if(rename(tmpfile, filename)) { fprintf(stderr, "Error renaming temporary file %s to configuration file %s: %s\n", tmpfile, filename, strerror(errno)); return 1; } // Silently try notifying a running tincd of changes. fclose(stderr); if(connect_tincd()) sendline(fd, "%d %d", CONTROL, REQ_RELOAD); return 0; } bool check_id(const char *name) { for(int i = 0; i < strlen(name); i++) { if(!isalnum(name[i]) && name[i] != '_') return false; } return true; } static int cmd_init(int argc, char *argv[]) { if(!access(tinc_conf, F_OK)) { fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf); return 1; } if(argc < 2) { if(isatty(0) && isatty(1)) { char buf[1024]; fprintf(stdout, "Enter the Name you want your tinc node to have: "); fflush(stdout); if(!fgets(buf, sizeof buf, stdin)) { fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno)); return 1; } int len = rstrip(buf); if(!len) { fprintf(stderr, "No name given!\n"); return 1; } name = strdup(buf); } else { fprintf(stderr, "No Name given!\n"); return 1; } } else { name = strdup(argv[1]); if(!*name) { fprintf(stderr, "No Name given!\n"); return 1; } } if(!check_id(name)) { fprintf(stderr, "Invalid Name! Only a-z, A-Z, 0-9 and _ are allowed characters.\n"); return 1; } if(mkdir(CONFDIR, 0755) && errno != EEXIST) { fprintf(stderr, "Could not create directory %s: %s\n", CONFDIR, strerror(errno)); return 1; } if(mkdir(confbase, 0755) && errno != EEXIST) { fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno)); return 1; } char *hosts_dir = NULL; xasprintf(&hosts_dir, "%s/hosts", confbase); if(mkdir(hosts_dir, 0755) && errno != EEXIST) { fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno)); return 1; } FILE *f = fopen(tinc_conf, "w"); if(!f) { fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno)); return 1; } fprintf(f, "Name = %s\n", name); fclose(f); fclose(stdin); if(!rsa_keygen(2048) || !ecdsa_keygen()) return false; return true; } static int cmd_generate_keys(int argc, char *argv[]) { return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048) && ecdsa_keygen()); } static int cmd_generate_rsa_keys(int argc, char *argv[]) { return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048); } static int cmd_generate_ecdsa_keys(int argc, char *argv[]) { return !ecdsa_keygen(); } static int cmd_help(int argc, char *argv[]) { usage(false); return 0; } static int cmd_version(int argc, char *argv[]) { version(); return 0; } static int cmd_info(int argc, char *argv[]) { if(argc != 2) { fprintf(stderr, "Invalid number of arguments.\n"); return 1; } if(!connect_tincd()) return 1; return info(fd, argv[1]); } static const char *conffiles[] = { "tinc.conf", "tinc-up", "tinc-down", "subnet-up", "subnet-down", "host-up", "host-down", NULL, }; static int cmd_edit(int argc, char *argv[]) { if(argc != 2) { fprintf(stderr, "Invalid number of arguments.\n"); return 1; } char *filename = NULL; if(strncmp(argv[1], "hosts/", 6)) { for(int i = 0; conffiles[i]; i++) { if(!strcmp(argv[1], conffiles[i])) { xasprintf(&filename, "%s/%s", confbase, argv[1]); break; } } } else { argv[1] += 6; } if(!filename) { xasprintf(&filename, "%s/%s", hosts_dir, argv[1]); char *dash = strchr(argv[1], '-'); if(dash) { *dash++ = 0; if((strcmp(dash, "up") && strcmp(dash, "down")) || !check_id(argv[1])) { fprintf(stderr, "Invalid configuration filename.\n"); return 1; } } } #ifndef HAVE_MINGW char *editor = getenv("VISUAL") ?: getenv("EDITOR") ?: "vi"; #else char *editor = "edit"; #endif char *command; xasprintf(&command, "\"%s\" \"%s\"", editor, filename); int result = system(command); if(result) return result; // Silently try notifying a running tincd of changes. fclose(stderr); if(connect_tincd()) sendline(fd, "%d %d", CONTROL, REQ_RELOAD); return 0; } static int export(const char *name, FILE *out) { char *filename; xasprintf(&filename, "%s/%s", hosts_dir, name); FILE *in = fopen(filename, "r"); if(!in) { fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno)); return 1; } fprintf(out, "Name = %s\n", name); char buf[4096]; while(fgets(buf, sizeof buf, in)) { if(strcspn(buf, "\t =") != 4 || strncasecmp(buf, "Name", 4)) fputs(buf, out); } if(ferror(in)) { fprintf(stderr, "Error while reading configuration file %s: %s\n", filename, strerror(errno)); return 1; } fclose(in); return 0; } static int cmd_export(int argc, char *argv[]) { char *name = get_my_name(); if(!name) return 1; return export(name, stdout); } static int cmd_export_all(int argc, char *argv[]) { DIR *dir = opendir(hosts_dir); if(!dir) { fprintf(stderr, "Could not open host configuration directory %s: %s\n", hosts_dir, strerror(errno)); return 1; } bool first = true; int result = 0; struct dirent *ent; while((ent = readdir(dir))) { if(!check_id(ent->d_name)) continue; if(first) first = false; else printf("#---------------------------------------------------------------#\n"); result |= export(ent->d_name, stdout); } closedir(dir); return result; } static int cmd_import(int argc, char *argv[]) { FILE *in = stdin; FILE *out = NULL; char buf[4096]; char name[4096]; char *filename; int count = 0; bool firstline = true; while(fgets(buf, sizeof buf, in)) { if(sscanf(buf, "Name = %s", name) == 1) { if(!check_id(name)) { fprintf(stderr, "Invalid Name in input!\n"); return 1; } if(out) fclose(out); free(filename); xasprintf(&filename, "%s/%s", hosts_dir, name); if(!force && !access(filename, F_OK)) { fprintf(stderr, "Host configuration file %s already exists, skipping.\n", filename); out = NULL; continue; } out = fopen(filename, "w"); if(!out) { fprintf(stderr, "Error creating configuration file %s: %s\n", filename, strerror(errno)); return 1; } count++; firstline = false; continue; } else if(firstline) { fprintf(stderr, "Junk at the beginning of the input, ignoring.\n"); firstline = false; } if(!strcmp(buf, "#---------------------------------------------------------------#\n")) continue; if(out) { if(fputs(buf, out) < 0) { fprintf(stderr, "Error writing to host configuration file %s: %s\n", filename, strerror(errno)); return 1; } } } if(out) fclose(out); if(count) { fprintf(stderr, "Imported %d host configuration files.\n", count); return 0; } else { fprintf(stderr, "No host configuration files imported.\n"); return 1; } } static const struct { const char *command; int (*function)(int argc, char *argv[]); } commands[] = { {"start", cmd_start}, {"stop", cmd_stop}, {"restart", cmd_restart}, {"reload", cmd_reload}, {"dump", cmd_dump}, {"purge", cmd_purge}, {"debug", cmd_debug}, {"retry", cmd_retry}, {"connect", cmd_connect}, {"disconnect", cmd_disconnect}, {"top", cmd_top}, {"pcap", cmd_pcap}, {"log", cmd_log}, {"pid", cmd_pid}, {"config", cmd_config}, {"init", cmd_init}, {"generate-keys", cmd_generate_keys}, {"generate-rsa-keys", cmd_generate_rsa_keys}, {"generate-ecdsa-keys", cmd_generate_ecdsa_keys}, {"help", cmd_help}, {"version", cmd_version}, {"info", cmd_info}, {"edit", cmd_edit}, {"export", cmd_export}, {"export-all", cmd_export_all}, {"import", cmd_import}, {NULL, NULL}, }; int main(int argc, char *argv[]) { program_name = argv[0]; if(!parse_options(argc, argv)) return 1; make_names(); if(show_version) { version(); return 0; } if(show_help) { usage(false); return 0; } if(optind >= argc) { fprintf(stderr, "No command given.\n"); usage(true); return 1; } for(int i = 0; commands[i].command; i++) { if(!strcasecmp(argv[optind], commands[i].command)) return commands[i].function(argc - optind, argv + optind); } fprintf(stderr, "Unknown command `%s'.\n", argv[optind]); usage(true); return 1; }