/* tincctl.c -- Controlling a running tincd Copyright (C) 2007-2013 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 #ifdef HAVE_READLINE #include "readline/readline.h" #include "readline/history.h" #endif #include "xalloc.h" #include "protocol.h" #include "control_common.h" #include "crypto.h" #include "ecdsagen.h" #include "info.h" #include "invitation.h" #include "names.h" #include "rsagen.h" #include "utils.h" #include "tincctl.h" #include "top.h" #ifdef HAVE_MINGW #define SCRIPTEXTENSION ".bat" #else #define SCRIPTEXTENSION "" #endif static char **orig_argv; static int orig_argc; /* 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 controlcookie[1025]; char *tinc_conf = NULL; char *hosts_dir = NULL; struct timeval now; // Horrible global variables... static int pid = 0; int fd = -1; char line[4096]; static int code; static int req; static int result; static bool force = false; bool tty = true; bool confbasegiven = false; bool netnamegiven = false; #ifdef HAVE_MINGW static struct WSAData wsa_state; #endif static struct option const long_options[] = { {"config", required_argument, NULL, 'c'}, {"net", required_argument, NULL, 'n'}, {"help", no_argument, NULL, 1}, {"version", no_argument, NULL, 2}, {"pidfile", required_argument, NULL, 3}, {"force", no_argument, NULL, 4}, {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" " get VARIABLE Print current value of VARIABLE\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 [tincd options] 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" " [reachable] 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" " [di]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" " exchange [--force] Same as export followed by import\n" " exchange-all [--force] Same as export-all followed by import\n" " invite NODE [...] Generate an invitation for NODE\n" " join INVITATION Join a VPN using an INVITIATION\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:", long_options, &option_index)) != EOF) { switch (r) { case 0: /* long option */ break; case 'c': /* config file */ confbase = xstrdup(optarg); confbasegiven = true; 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 3: /* open control socket here */ pidfilename = xstrdup(optarg); break; case 4: /* force */ force = true; break; case '?': /* wrong options */ usage(true); return false; default: break; } } if(!netname && (netname = getenv("NETNAME"))) netname = xstrdup(netname); /* netname "." is special: a "top-level name" */ if(netname && (!*netname || !strcmp(netname, "."))) { free(netname); netname = NULL; } if(netname && (strpbrk(netname, "\\/") || *netname == '.')) { fprintf(stderr, "Invalid character in netname!\n"); return false; } return true; } /* Open a file with the desired permissions, minus the umask. Also, if we want to create an executable file, we call fchmod() to set the executable bits. */ FILE *fopenmask(const char *filename, const char *mode, mode_t perms) { mode_t mask = umask(0); perms &= ~mask; umask(~perms); FILE *f = fopen(filename, mode); #ifdef HAVE_FCHMOD if((perms & 0444) && f) fchmod(fileno(f), perms); #endif umask(mask); return f; } static void disable_old_keys(const char *filename, const char *what) { char tmpfile[PATH_MAX] = ""; char buf[1024]; bool disabled = false; bool block = false; bool error = false; FILE *r, *w; r = fopen(filename, "r"); if(!r) return; snprintf(tmpfile, sizeof tmpfile, "%s.tmp", filename); struct stat st = {.st_mode = 0600}; fstat(fileno(r), &st); w = fopenmask(tmpfile, "w", st.st_mode); while(fgets(buf, sizeof buf, r)) { if(!block && !strncmp(buf, "-----BEGIN ", 11)) { if((strstr(buf, " EC ") && strstr(what, "ECDSA")) || (strstr(buf, " RSA ") && strstr(what, "RSA"))) { disabled = true; block = true; } } bool ecdsapubkey = !strncasecmp(buf, "ECDSAPublicKey", 14) && strchr(" \t=", buf[14]) && strstr(what, "ECDSA"); if(ecdsapubkey) disabled = true; if(w) { if(block || ecdsapubkey) fputc('#', w); if(fputs(buf, w) < 0) { error = true; break; } } if(block && !strncmp(buf, "-----END ", 9)) block = false; } if(w) if(fclose(w) < 0) error = true; if(ferror(r) || fclose(r) < 0) error = true; if(disabled) { if(!w || error) { fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n"); if(w) unlink(tmpfile); return; } #ifdef HAVE_MINGW // We cannot atomically replace files on Windows. char bakfile[PATH_MAX] = ""; snprintf(bakfile, sizeof bakfile, "%s.bak", filename); if(rename(filename, bakfile) || rename(tmpfile, filename)) { rename(bakfile, filename); #else if(rename(tmpfile, filename)) { #endif fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n"); } else { #ifdef HAVE_MINGW unlink(bakfile); #endif fprintf(stderr, "Warning: old key(s) found and disabled.\n"); } } unlink(tmpfile); } static FILE *ask_and_open(const char *filename, const char *what, const char *mode, bool ask, mode_t perms) { FILE *r; char *directory; char buf[PATH_MAX]; char buf2[PATH_MAX]; /* Check stdin and stdout */ if(ask && tty) { /* 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" SLASH "%s", directory, filename); filename = buf2; } disable_old_keys(filename, what); /* Open it first to keep the inode busy */ r = fopenmask(filename, mode, perms); 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(bool ask) { ecdsa_t *key; FILE *f; char *pubname, *privname; fprintf(stderr, "Generating ECDSA keypair:\n"); if(!(key = ecdsa_generate())) { fprintf(stderr, "Error during key generation!\n"); return false; } else fprintf(stderr, "Done.\n"); xasprintf(&privname, "%s" SLASH "ecdsa_key.priv", confbase); f = ask_and_open(privname, "private ECDSA key", "a", ask, 0600); free(privname); if(!f) return false; if(!ecdsa_write_pem_private_key(key, f)) { fprintf(stderr, "Error writing private key!\n"); ecdsa_free(key); fclose(f); return false; } fclose(f); if(name) xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name); else xasprintf(&pubname, "%s" SLASH "ecdsa_key.pub", confbase); f = ask_and_open(pubname, "public ECDSA key", "a", ask, 0666); free(pubname); if(!f) return false; char *pubkey = ecdsa_get_base64_public_key(key); fprintf(f, "ECDSAPublicKey = %s\n", pubkey); free(pubkey); fclose(f); ecdsa_free(key); return true; } /* Generate a public/private RSA keypair, and ask for a file to store them in. */ static bool rsa_keygen(int bits, bool ask) { rsa_t *key; FILE *f; char *pubname, *privname; fprintf(stderr, "Generating %d bits keys:\n", bits); if(!(key = rsa_generate(bits, 0x10001))) { fprintf(stderr, "Error during key generation!\n"); return false; } else fprintf(stderr, "Done.\n"); xasprintf(&privname, "%s" SLASH "rsa_key.priv", confbase); f = ask_and_open(privname, "private RSA key", "a", ask, 0600); free(privname); if(!f) return false; if(!rsa_write_pem_private_key(key, f)) { fprintf(stderr, "Error writing private key!\n"); fclose(f); rsa_free(key); return false; } fclose(f); if(name) xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name); else xasprintf(&pubname, "%s" SLASH "rsa_key.pub", confbase); f = ask_and_open(pubname, "public RSA key", "a", ask, 0666); free(pubname); if(!f) return false; if(!rsa_write_pem_public_key(key, f)) { fprintf(stderr, "Error writing public key!\n"); fclose(f); rsa_free(key); return false; } fclose(f); rsa_free(key); return true; } char buffer[4096]; size_t blen = 0; bool recvline(int fd, char *line, size_t len) { char *newline = NULL; if(!fd) abort(); 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; } bool recvdata(int fd, char *data, size_t len) { if(len == -1) len = blen; 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 bool connect_tincd(bool verbose) { if(fd >= 0) { fd_set r; FD_ZERO(&r); FD_SET(fd, &r); struct timeval tv = {0, 0}; if(select(fd + 1, &r, NULL, NULL, &tv)) { fprintf(stderr, "Previous connection to tincd lost, reconnecting.\n"); close(fd); fd = -1; } else { return true; } } FILE *f = fopen(pidfilename, "r"); if(!f) { if(verbose) fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno)); return false; } char host[129]; char port[129]; if(fscanf(f, "%20d %1024s %128s port %128s", &pid, controlcookie, host, port) != 4) { if(verbose) fprintf(stderr, "Could not parse pid file %s\n", pidfilename); fclose(f); return false; } fclose(f); #ifdef HAVE_MINGW if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) { if(verbose) fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError())); return false; } #endif #ifndef HAVE_MINGW struct sockaddr_un sa; sa.sun_family = AF_UNIX; strncpy(sa.sun_path, unixsocketname, sizeof sa.sun_path); fd = socket(AF_UNIX, SOCK_STREAM, 0); if(fd < 0) { if(verbose) fprintf(stderr, "Cannot create UNIX socket: %s\n", sockstrerror(sockerrno)); return false; } if(connect(fd, (struct sockaddr *)&sa, sizeof sa) < 0) { if(verbose) fprintf(stderr, "Cannot connect to UNIX socket %s: %s\n", unixsocketname, sockstrerror(sockerrno)); close(fd); fd = -1; return false; } #else 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) { if(verbose) 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) { if(verbose) 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) { if(verbose) fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno)); } #endif if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) { if(verbose) fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno)); close(fd); fd = -1; return false; } freeaddrinfo(res); #endif char data[4096]; int version; if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %s %d", &code, data, &version) != 3 || code != 0) { if(verbose) fprintf(stderr, "Cannot read greeting from control socket: %s\n", sockstrerror(sockerrno)); close(fd); fd = -1; 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) { if(verbose) fprintf(stderr, "Could not fully establish control socket connection\n"); close(fd); fd = -1; return false; } return true; } static int cmd_start(int argc, char *argv[]) { if(connect_tincd(false)) { if(netname) fprintf(stderr, "A tincd is already running for net `%s' with pid %d.\n", netname, pid); else fprintf(stderr, "A tincd is already running with pid %d.\n", pid); return 0; } char *c; char *slash = strrchr(program_name, '/'); #ifdef HAVE_MINGW if ((c = strrchr(program_name, '\\')) > slash) slash = c; #endif if (slash++) xasprintf(&c, "%.*stincd", (int)(slash - program_name), program_name); else c = "tincd"; int nargc = 0; char **nargv = xzalloc((optind + argc) * sizeof *nargv); nargv[nargc++] = c; for(int i = 1; i < optind; i++) nargv[nargc++] = orig_argv[i]; for(int i = 1; i < argc; i++) nargv[nargc++] = argv[i]; #ifdef HAVE_MINGW execvp(c, nargv); fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno)); return 1; #else pid_t pid = fork(); if(pid == -1) { fprintf(stderr, "Could not fork: %s\n", strerror(errno)); free(nargv); return 1; } if(!pid) exit(execvp(c, nargv)); free(nargv); int status = -1, result; #ifdef SIGINT signal(SIGINT, SIG_IGN); #endif result = waitpid(pid, &status, 0); #ifdef SIGINT signal(SIGINT, SIG_DFL); #endif if(result != pid || !WIFEXITED(status) || WEXITSTATUS(status)) { fprintf(stderr, "Error starting %s\n", c); return 1; } return 0; #endif } static int cmd_stop(int argc, char *argv[]) { if(argc > 1) { fprintf(stderr, "Too many arguments!\n"); return 1; } #ifndef HAVE_MINGW if(!connect_tincd(true)) { if(pid) { if(kill(pid, SIGTERM)) { fprintf(stderr, "Could not send TERM signal to process with PID %u: %s\n", pid, strerror(errno)); return 1; } fprintf(stderr, "Sent TERM signal to process with PID %u.\n", pid); waitpid(pid, NULL, 0); return 0; } return 1; } sendline(fd, "%d %d", CONTROL, REQ_STOP); while(recvline(fd, line, sizeof line)) { // Wait for tincd to close the connection... } #else if(!remove_service()) return 1; #endif close(fd); pid = 0; fd = -1; return 0; } static int cmd_restart(int argc, char *argv[]) { cmd_stop(1, argv); return cmd_start(argc, argv); } static int cmd_reload(int argc, char *argv[]) { if(argc > 1) { fprintf(stderr, "Too many arguments!\n"); return 1; } if(!connect_tincd(true)) 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[]) { bool only_reachable = false; if(argc > 2 && !strcasecmp(argv[1], "reachable")) { if(strcasecmp(argv[2], "nodes")) { fprintf(stderr, "`reachable' only supported for nodes.\n"); usage(true); return 1; } only_reachable = true; argv++; argc--; } if(argc != 2) { fprintf(stderr, "Invalid number of arguments.\n"); usage(true); return 1; } if(!connect_tincd(true)) return 1; int do_graph = 0; 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 = 1; } else if(!strcasecmp(argv[1], "digraph")) { sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES); sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES); do_graph = 2; } else { fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]); usage(true); return 1; } if(do_graph == 1) printf("graph {\n"); else if(do_graph == 2) printf("digraph {\n"); while(recvline(fd, line, sizeof line)) { char node1[4096], node2[4096]; int n = sscanf(line, "%d %d %s %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; char node[4096]; char from[4096]; char to[4096]; char subnet[4096]; char host[4096]; char port[4096]; char via[4096]; char nexthop[4096]; int cipher, digest, maclength, compression, distance, socket, weight; short int pmtu, minmtu, maxmtu; unsigned int options, status_int; node_status_t status; long int last_state_change; switch(req) { case REQ_DUMP_NODES: { int n = sscanf(line, "%*d %*d %s %s port %s %d %d %d %d %x %x %s %s %d %hd %hd %hd %ld", node, host, port, &cipher, &digest, &maclength, &compression, &options, &status_int, nexthop, via, &distance, &pmtu, &minmtu, &maxmtu, &last_state_change); if(n != 16) { fprintf(stderr, "Unable to parse node dump from tincd: %s\n", line); return 1; } memcpy(&status, &status_int, sizeof status); if(do_graph) { const char *color = "black"; if(!strcmp(host, "MYSELF")) color = "green"; else if(!status.reachable) color = "red"; else if(strcmp(via, node)) color = "orange"; else if(!status.validkey) color = "black"; else if(minmtu > 0) color = "green"; printf(" %s [label = \"%s\", color = \"%s\"%s];\n", node, node, color, strcmp(host, "MYSELF") ? "" : ", style = \"filled\""); } else { if(only_reachable && !status.reachable) continue; printf("%s at %s port %s cipher %d digest %d maclength %d compression %d options %x status %04x nexthop %s via %s distance %d pmtu %hd (min %hd max %hd)\n", node, host, port, cipher, digest, maclength, compression, options, status_int, nexthop, via, distance, pmtu, minmtu, maxmtu); } } break; case REQ_DUMP_EDGES: { int n = sscanf(line, "%*d %*d %s %s %s port %s %x %d", from, to, host, port, &options, &weight); if(n != 6) { fprintf(stderr, "Unable to parse edge dump from tincd.\n"); return 1; } if(do_graph) { float w = 1 + 65536.0 / weight; if(do_graph == 1 && strcmp(node1, node2) > 0) printf(" %s -- %s [w = %f, weight = %f];\n", node1, node2, w, w); else if(do_graph == 2) printf(" %s -> %s [w = %f, weight = %f];\n", node1, node2, w, w); } else { printf("%s to %s at %s port %s options %x weight %d\n", from, to, host, port, options, weight); } } break; case REQ_DUMP_SUBNETS: { int n = sscanf(line, "%*d %*d %s %s", subnet, node); if(n != 2) { fprintf(stderr, "Unable to parse subnet dump from tincd.\n"); return 1; } printf("%s owner %s\n", strip_weight(subnet), node); } break; case REQ_DUMP_CONNECTIONS: { int n = sscanf(line, "%*d %*d %s %s port %s %x %d %x", node, host, port, &options, &socket, &status_int); if(n != 6) { fprintf(stderr, "Unable to parse connection dump from tincd.\n"); return 1; } printf("%s at %s port %s options %x socket %d status %x\n", node, host, port, options, socket, status_int); } break; default: fprintf(stderr, "Unable to parse dump from tincd.\n"); return 1; } } fprintf(stderr, "Error receiving dump.\n"); return 1; } static int cmd_purge(int argc, char *argv[]) { if(argc > 1) { fprintf(stderr, "Too many arguments!\n"); return 1; } if(!connect_tincd(true)) 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(true)) 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(argc > 1) { fprintf(stderr, "Too many arguments!\n"); return 1; } if(!connect_tincd(true)) 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[1])) { fprintf(stderr, "Invalid name for node.\n"); return 1; } if(!connect_tincd(true)) 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[1])) { fprintf(stderr, "Invalid name for node.\n"); return 1; } if(!connect_tincd(true)) 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[]) { if(argc > 1) { fprintf(stderr, "Too many arguments!\n"); return 1; } #ifdef HAVE_CURSES if(!connect_tincd(true)) return 1; top(fd); return 0; #else fprintf(stderr, "This version of tinc was compiled without support for the curses library.\n"); return 1; #endif } static int cmd_pcap(int argc, char *argv[]) { if(argc > 2) { fprintf(stderr, "Too many arguments!\n"); return 1; } if(!connect_tincd(true)) return 1; pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0); return 0; } #ifdef SIGINT static void sigint_handler(int sig) { fprintf(stderr, "\n"); shutdown(fd, SHUT_RDWR); } #endif static int cmd_log(int argc, char *argv[]) { if(argc > 2) { fprintf(stderr, "Too many arguments!\n"); return 1; } if(!connect_tincd(true)) return 1; #ifdef SIGINT signal(SIGINT, sigint_handler); #endif logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1); #ifdef SIGINT signal(SIGINT, SIG_DFL); #endif close(fd); fd = -1; return 0; } static int cmd_pid(int argc, char *argv[]) { if(argc > 1) { fprintf(stderr, "Too many arguments!\n"); return 1; } if(!connect_tincd(true) && !pid) return 1; printf("%d\n", pid); return 0; } int rstrip(char *value) { int len = strlen(value); while(len && strchr("\t\r\n ", value[len - 1])) value[--len] = 0; return len; } char *get_my_name(bool verbose) { FILE *f = fopen(tinc_conf, "r"); if(!f) { if(verbose) 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); if(verbose) fprintf(stderr, "Could not find Name in %s.\n", tinc_conf); return NULL; } const var_t variables[] = { /* Server configuration */ {"AddressFamily", VAR_SERVER}, {"AutoConnect", VAR_SERVER | VAR_SAFE}, {"BindToAddress", VAR_SERVER | VAR_MULTIPLE}, {"BindToInterface", VAR_SERVER}, {"Broadcast", VAR_SERVER | VAR_SAFE}, {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE}, {"DecrementTTL", VAR_SERVER}, {"Device", VAR_SERVER}, {"DeviceType", VAR_SERVER}, {"DirectOnly", VAR_SERVER}, {"ECDSAPrivateKeyFile", VAR_SERVER}, {"ExperimentalProtocol", VAR_SERVER}, {"Forwarding", VAR_SERVER}, {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE}, {"Hostnames", VAR_SERVER}, {"IffOneQueue", VAR_SERVER}, {"Interface", VAR_SERVER}, {"KeyExpire", VAR_SERVER}, {"LocalDiscovery", VAR_SERVER}, {"MACExpire", VAR_SERVER}, {"MaxConnectionBurst", VAR_SERVER}, {"MaxOutputBufferSize", VAR_SERVER}, {"MaxTimeout", VAR_SERVER}, {"Mode", VAR_SERVER | VAR_SAFE}, {"Name", VAR_SERVER}, {"PingInterval", VAR_SERVER}, {"PingTimeout", VAR_SERVER}, {"PriorityInheritance", VAR_SERVER}, {"PrivateKey", VAR_SERVER | VAR_OBSOLETE}, {"PrivateKeyFile", VAR_SERVER}, {"ProcessPriority", VAR_SERVER}, {"Proxy", VAR_SERVER}, {"ReplayWindow", VAR_SERVER}, {"ScriptsExtension", VAR_SERVER}, {"ScriptsInterpreter", VAR_SERVER}, {"StrictSubnets", VAR_SERVER}, {"TunnelServer", VAR_SERVER}, {"UDPRcvBuf", VAR_SERVER}, {"UDPSndBuf", VAR_SERVER}, {"VDEGroup", VAR_SERVER}, {"VDEPort", 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}, {"ECDSAPublicKey", VAR_HOST}, {"ECDSAPublicKeyFile", 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_HOST | VAR_OBSOLETE}, {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE}, {"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE}, {"TCPOnly", VAR_SERVER | VAR_HOST}, {"Weight", VAR_HOST | VAR_SAFE}, {NULL, 0} }; static int cmd_config(int argc, char *argv[]) { if(argc < 2) { fprintf(stderr, "Invalid number of arguments.\n"); return 1; } if(strcasecmp(argv[0], "config")) argv--, argc++; int action = -2; if(!strcasecmp(argv[1], "get")) { argv++, argc--; } else 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; } if(action < -1 && *value) action = 0; /* Some simple checks. */ bool found = false; bool warnonremove = 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(true); if(!node) return 1; } /* Change "add" into "set" for variables that do not allow multiple occurences. Turn on warnings when it seems variables might be removed unintentionally. */ if(action == 1 && !(variables[i].type & VAR_MULTIPLE)) { warnonremove = true; action = 0; } else if(action == 0 && (variables[i].type & VAR_MULTIPLE)) { warnonremove = true; } break; } if(node && !check_id(node)) { fprintf(stderr, "Invalid name for node.\n"); return 1; } if(!found) { if(force || action < 0) { 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" SLASH "%s", hosts_dir, node); else filename = tinc_conf; FILE *f = fopen(filename, "r"); if(!f) { fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno)); return 1; } char *tmpfile = NULL; FILE *tf = NULL; if(action >= -1) { xasprintf(&tmpfile, "%s.config.tmp", filename); tf = fopen(tmpfile, "w"); if(!tf) { fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno)); fclose(f); return 1; } } // Copy the file, making modifications on the fly, unless we are just getting a value. char buf1[4096]; char buf2[4096]; bool set = false; bool removed = false; found = 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)) { // Get if(action < -1) { found = true; printf("%s\n", bvalue); // Del } else if(action == -1) { if(!*value || !strcasecmp(bvalue, value)) { removed = true; continue; } // Set } else if(action == 0) { // Warn if "set" was used for variables that can occur multiple times if(warnonremove && strcasecmp(bvalue, value)) fprintf(stderr, "Warning: removing %s = %s\n", variable, bvalue); // 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; } } if(action >= -1) { // 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; } } if(action < -1) { if(!found) fprintf(stderr, "No matching configuration variables found.\n"); return 0; } // 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. if(connect_tincd(false)) sendline(fd, "%d %d", CONTROL, REQ_RELOAD); return 0; } bool check_id(const char *name) { if(!name || !*name) return false; for(int i = 0; i < strlen(name); i++) { if(!isalnum(name[i]) && name[i] != '_') return false; } return true; } static bool try_bind(int port) { struct addrinfo *ai = NULL; struct addrinfo hint = { .ai_flags = AI_PASSIVE, .ai_family = AF_UNSPEC, .ai_socktype = SOCK_STREAM, .ai_protocol = IPPROTO_TCP, }; char portstr[16]; snprintf(portstr, sizeof portstr, "%d", port); if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) return false; while(ai) { int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP); if(!fd) return false; int result = bind(fd, ai->ai_addr, ai->ai_addrlen); closesocket(fd); if(result) return false; ai = ai->ai_next; } return true; } int check_port(char *name) { if(try_bind(655)) return 655; fprintf(stderr, "Warning: could not bind to port 655. "); for(int i = 0; i < 100; i++) { int port = 0x1000 + (rand() & 0x7fff); if(try_bind(port)) { char *filename; xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name); FILE *f = fopen(filename, "a"); free(filename); if(!f) { fprintf(stderr, "Please change tinc's Port manually.\n"); return 0; } fprintf(f, "Port = %d\n", port); fclose(f); fprintf(stderr, "Tinc will instead listen on port %d.\n", port); return port; } } fprintf(stderr, "Please change tinc's Port manually.\n"); return 0; } 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) { fprintf(stderr, "Too many arguments!\n"); return 1; } else if(argc < 2) { if(tty) { 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(strcmp(confdir, confbase) && mkdir(confdir, 0755) && errno != EEXIST) { fprintf(stderr, "Could not create directory %s: %s\n", confdir, strerror(errno)); return 1; } if(mkdir(confbase, 0777) && errno != EEXIST) { fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno)); return 1; } if(mkdir(hosts_dir, 0777) && 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); if(!rsa_keygen(2048, false) || !ecdsa_keygen(false)) return 1; check_port(name); #ifndef HAVE_MINGW char *filename; xasprintf(&filename, "%s" SLASH "tinc-up", confbase); if(access(filename, F_OK)) { FILE *f = fopenmask(filename, "w", 0777); if(!f) { fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno)); return 1; } fprintf(f, "#!/bin/sh\n\necho 'Unconfigured tinc-up script, please edit!'\n\n#ifconfig $INTERFACE netmask \n"); fclose(f); } #endif return 0; } static int cmd_generate_keys(int argc, char *argv[]) { if(argc > 2) { fprintf(stderr, "Too many arguments!\n"); return 1; } if(!name) name = get_my_name(false); return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true) && ecdsa_keygen(true)); } static int cmd_generate_rsa_keys(int argc, char *argv[]) { if(argc > 2) { fprintf(stderr, "Too many arguments!\n"); return 1; } if(!name) name = get_my_name(false); return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true); } static int cmd_generate_ecdsa_keys(int argc, char *argv[]) { if(argc > 1) { fprintf(stderr, "Too many arguments!\n"); return 1; } if(!name) name = get_my_name(false); return !ecdsa_keygen(true); } static int cmd_help(int argc, char *argv[]) { usage(false); return 0; } static int cmd_version(int argc, char *argv[]) { if(argc > 1) { fprintf(stderr, "Too many arguments!\n"); return 1; } 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(true)) 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" SLASH, 6)) { for(int i = 0; conffiles[i]; i++) { if(!strcmp(argv[1], conffiles[i])) { xasprintf(&filename, "%s" SLASH "%s", confbase, argv[1]); break; } } } else { argv[1] += 6; } if(!filename) { xasprintf(&filename, "%s" SLASH "%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; } } } char *command; #ifndef HAVE_MINGW xasprintf(&command, "\"%s\" \"%s\"", getenv("VISUAL") ?: getenv("EDITOR") ?: "vi", filename); #else xasprintf(&command, "edit \"%s\"", filename); #endif int result = system(command); if(result) return result; // Silently try notifying a running tincd of changes. if(connect_tincd(false)) sendline(fd, "%d %d", CONTROL, REQ_RELOAD); return 0; } static int export(const char *name, FILE *out) { char *filename; xasprintf(&filename, "%s" SLASH "%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)); fclose(in); return 1; } fclose(in); return 0; } static int cmd_export(int argc, char *argv[]) { if(argc > 1) { fprintf(stderr, "Too many arguments!\n"); return 1; } char *name = get_my_name(true); if(!name) return 1; int result = export(name, stdout); if(!tty) fclose(stdout); free(name); return result; } static int cmd_export_all(int argc, char *argv[]) { if(argc > 1) { fprintf(stderr, "Too many arguments!\n"); return 1; } 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); if(!tty) fclose(stdout); return result; } static int cmd_import(int argc, char *argv[]) { if(argc > 1) { fprintf(stderr, "Too many arguments!\n"); return 1; } FILE *in = stdin; FILE *out = NULL; char buf[4096]; char name[4096]; char *filename = NULL; int count = 0; bool firstline = true; while(fgets(buf, sizeof buf, in)) { if(sscanf(buf, "Name = %s", name) == 1) { firstline = false; if(!check_id(name)) { fprintf(stderr, "Invalid Name in input!\n"); return 1; } if(out) fclose(out); free(filename); xasprintf(&filename, "%s" SLASH "%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++; 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 int cmd_exchange(int argc, char *argv[]) { return cmd_export(argc, argv) ?: cmd_import(argc, argv); } static int cmd_exchange_all(int argc, char *argv[]) { return cmd_export_all(argc, argv) ?: cmd_import(argc, argv); } static const struct { const char *command; int (*function)(int argc, char *argv[]); bool hidden; } 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, true}, {"add", cmd_config}, {"del", cmd_config}, {"get", cmd_config}, {"set", 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}, {"exchange", cmd_exchange}, {"exchange-all", cmd_exchange_all}, {"invite", cmd_invite}, {"join", cmd_join}, {NULL, NULL}, }; #ifdef HAVE_READLINE static char *complete_command(const char *text, int state) { static int i; if(!state) i = 0; else i++; while(commands[i].command) { if(!commands[i].hidden && !strncasecmp(commands[i].command, text, strlen(text))) return xstrdup(commands[i].command); i++; } return NULL; } static char *complete_dump(const char *text, int state) { const char *matches[] = {"reachable", "nodes", "edges", "subnets", "connections", "graph", NULL}; static int i; if(!state) i = 0; else i++; while(matches[i]) { if(!strncasecmp(matches[i], text, strlen(text))) return xstrdup(matches[i]); i++; } return NULL; } static char *complete_config(const char *text, int state) { static int i; if(!state) i = 0; else i++; while(variables[i].name) { char *dot = strchr(text, '.'); if(dot) { if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) { char *match; xasprintf(&match, "%.*s.%s", (int)(dot - text), text, variables[i].name); return match; } } else { if(!strncasecmp(variables[i].name, text, strlen(text))) return xstrdup(variables[i].name); } i++; } return NULL; } static char *complete_info(const char *text, int state) { static int i; if(!state) { i = 0; if(!connect_tincd(false)) return NULL; // Check the list of nodes sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES); sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS); } while(recvline(fd, line, sizeof line)) { char item[4096]; int n = sscanf(line, "%d %d %s", &code, &req, item); if(n == 2) { i++; if(i >= 2) break; else continue; } if(n != 3) { fprintf(stderr, "Unable to parse dump from tincd, n = %d, i = %d.\n", n, i); break; } if(!strncmp(item, text, strlen(text))) return xstrdup(strip_weight(item)); } return NULL; } static char *complete_nothing(const char *text, int state) { return NULL; } static char **completion (const char *text, int start, int end) { char **matches = NULL; if(!start) matches = rl_completion_matches(text, complete_command); else if(!strncasecmp(rl_line_buffer, "dump ", 5)) matches = rl_completion_matches(text, complete_dump); else if(!strncasecmp(rl_line_buffer, "add ", 4)) matches = rl_completion_matches(text, complete_config); else if(!strncasecmp(rl_line_buffer, "del ", 4)) matches = rl_completion_matches(text, complete_config); else if(!strncasecmp(rl_line_buffer, "get ", 4)) matches = rl_completion_matches(text, complete_config); else if(!strncasecmp(rl_line_buffer, "set ", 4)) matches = rl_completion_matches(text, complete_config); else if(!strncasecmp(rl_line_buffer, "info ", 5)) matches = rl_completion_matches(text, complete_info); return matches; } #endif static int cmd_shell(int argc, char *argv[]) { char *prompt; xasprintf(&prompt, "%s> ", identname); int result = 0; char buf[4096]; char *line = NULL; int maxargs = argc + 16; char **nargv = xmalloc(maxargs * sizeof *nargv); for(int i = 0; i < argc; i++) nargv[i] = argv[i]; #ifdef HAVE_READLINE rl_readline_name = "tinc"; rl_completion_entry_function = complete_nothing; rl_attempted_completion_function = completion; rl_filename_completion_desired = 0; char *copy = NULL; #endif while(true) { #ifdef HAVE_READLINE if(tty) { free(copy); free(line); rl_basic_word_break_characters = "\t\n "; line = readline(prompt); if(line) copy = xstrdup(line); } else { line = fgets(buf, sizeof buf, stdin); } #else if(tty) fputs(prompt, stdout); line = fgets(buf, sizeof buf, stdin); #endif if(!line) break; /* Ignore comments */ if(*line == '#') continue; /* Split */ int nargc = argc; char *p = line + strspn(line, " \t\n"); char *next = strtok(p, " \t\n"); while(p && *p) { if(nargc >= maxargs) { fprintf(stderr, "next %p '%s', p %p '%s'\n", next, next, p, p); abort(); maxargs *= 2; nargv = xrealloc(nargv, maxargs * sizeof *nargv); } nargv[nargc++] = p; p = next; next = strtok(NULL, " \t\n"); } if(nargc == argc) continue; if(!strcasecmp(nargv[argc], "exit") || !strcasecmp(nargv[argc], "quit")) return result; bool found = false; for(int i = 0; commands[i].command; i++) { if(!strcasecmp(nargv[argc], commands[i].command)) { result |= commands[i].function(nargc - argc - 1, nargv + argc + 1); found = true; break; } } #ifdef HAVE_READLINE if(tty && found) add_history(copy); #endif if(!found) { fprintf(stderr, "Unknown command `%s'.\n", nargv[argc]); result |= 1; } } free(nargv); if(tty) printf("\n"); return result; } int main(int argc, char *argv[]) { program_name = argv[0]; orig_argv = argv; orig_argc = argc; if(!parse_options(argc, argv)) return 1; make_names(); xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase); xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase); if(show_version) { version(); return 0; } if(show_help) { usage(false); return 0; } srand(time(NULL)); crypto_init(); tty = isatty(0) && isatty(1); if(optind >= argc) return cmd_shell(argc, argv); 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; }