tinc/src/tincctl.c

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/*
tincctl.c -- Controlling a running tincd
Copyright (C) 2007-2011 Guus Sliepen <guus@tinc-vpn.org>
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 <getopt.h>
#include "xalloc.h"
#include "protocol.h"
#include "control_common.h"
#include "rsagen.h"
#include "utils.h"
#include "tincctl.h"
#include "top.h"
/* 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;
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static char *identname = NULL; /* program name for syslog */
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static char *pidfilename = NULL; /* pid file location */
static char controlcookie[1024];
char *netname = NULL;
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char *confbase = NULL;
static char *host = NULL;
#ifdef HAVE_MINGW
static struct WSAData wsa_state;
#endif
static struct option const long_options[] = {
{"config", required_argument, NULL, 'c'},
{"host", required_argument, NULL, 'h'},
{"net", required_argument, NULL, 'n'},
{"help", no_argument, NULL, 1},
{"version", no_argument, NULL, 2},
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{"pidfile", required_argument, NULL, 5},
{NULL, 0, NULL, 0}
};
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"
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" -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"
" start Start tincd.\n"
" stop Stop tincd.\n"
" restart Restart tincd.\n"
" reload Reload configuration of running tincd.\n"
" pid Show PID of currently running tincd.\n"
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" generate-keys [bits] Generate a new 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"
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" purge Purge unreachable nodes\n"
" debug N Set debug level\n"
" retry Retry all outgoing connections\n"
" reload Partial reload of configuration\n"
" disconnect NODE Close meta connection with NODE\n"
#ifdef HAVE_CURSES
" top Show real-time statistics\n"
#endif
" pcap Dump traffic in pcap format\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:h:", long_options, &option_index)) != EOF) {
switch (r) {
case 0: /* long option */
break;
case 'c': /* config file */
confbase = xstrdup(optarg);
break;
case 'h': /* alternative host to connect to */
host = 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 */
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pidfilename = xstrdup(optarg);
break;
case '?':
usage(true);
return false;
default:
break;
}
}
return true;
}
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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]: ",
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what, filename);
fflush(stdout);
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if(fgets(buf, sizeof buf, stdin) == NULL) {
fprintf(stderr, "Error while reading stdin: %s\n",
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strerror(errno));
return NULL;
}
size_t len = strlen(buf);
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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));
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return NULL;
}
return r;
}
/*
Generate a public/private RSA keypair, and ask for a file to store
them in.
*/
static bool 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);
}
}
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if(!pidfilename)
xasprintf(&pidfilename, "%s/pid", confbase);
RegCloseKey(key);
if(*installdir)
return;
}
#endif
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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");
}
}
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;
}
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;
size_t blen = 0;
va_list ap;
va_start(ap, format);
blen = vsnprintf(buffer, sizeof buffer, format, ap);
va_end(ap);
if(blen < 0 || 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;
}
void pcap(int fd, FILE *out) {
sendline(fd, "%d %d", CONTROL, REQ_PCAP);
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,
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);
}
}
int main(int argc, char *argv[], char *envp[]) {
int fd;
int result;
char port[128];
int pid;
program_name = argv[0];
if(!parse_options(argc, argv))
return 1;
make_names();
if(show_version) {
printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
VERSION, __DATE__, __TIME__, PROT_CURRENT);
printf("Copyright (C) 1998-2009 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");
return 0;
}
if(show_help) {
usage(false);
return 0;
}
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if(optind >= argc) {
fprintf(stderr, "Not enough arguments.\n");
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usage(true);
return 1;
}
// First handle commands that don't involve connecting to a running tinc daemon.
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if(!strcasecmp(argv[optind], "generate-keys")) {
return !keygen(optind > argc ? atoi(argv[optind + 1]) : 2048);
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}
if(!strcasecmp(argv[optind], "start")) {
argv[optind] = NULL;
execve(SBINDIR "/tincd", argv, envp);
fprintf(stderr, "Could not start tincd: %s", strerror(errno));
return 1;
}
/*
* Now handle commands that do involve connecting to a running tinc daemon.
* Authenticate the server by ensuring the parent directory can be
* traversed only by root. Note this is not totally race-free unless all
* ancestors are writable only by trusted users, which we don't verify.
*/
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FILE *f = fopen(pidfilename, "r");
if(!f) {
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fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno));
return 1;
}
if(fscanf(f, "%1024s %128s %20d", controlcookie, port, &pid) != 3) {
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fprintf(stderr, "Could not parse pid file %s\n", pidfilename);
return 1;
}
#ifdef HAVE_MINGW
if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
return 1;
}
#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 ?: "localhost", port, strerror(errno));
return 1;
}
fd = socket(res->ai_family, SOCK_STREAM, IPPROTO_TCP);
if(fd < 0) {
fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
return 1;
}
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#ifdef HAVE_MINGW
unsigned long arg = 0;
if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
}
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#endif
if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
fprintf(stderr, "Cannot connect to %s port %s: %s\n", host ?: "localhost", port, sockstrerror(sockerrno));
return 1;
}
freeaddrinfo(res);
char line[4096];
char data[4096];
int code, version, req;
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 1;
}
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 1;
}
if(!strcasecmp(argv[optind], "pid")) {
printf("%d\n", pid);
return 0;
}
if(!strcasecmp(argv[optind], "stop")) {
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;
}
return 0;
}
if(!strcasecmp(argv[optind], "reload")) {
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 tinc daemon\n");
return 1;
}
return 0;
}
if(!strcasecmp(argv[optind], "restart")) {
sendline(fd, "%d %d", CONTROL, REQ_RESTART);
if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RESTART || result) {
fprintf(stderr, "Could not restart tinc daemon\n");
return 1;
}
return 0;
}
if(!strcasecmp(argv[optind], "retry")) {
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;
}
if(!strcasecmp(argv[optind], "dump")) {
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if(argc < optind + 2) {
fprintf(stderr, "Not enough arguments.\n");
usage(true);
return 1;
}
bool do_graph = false;
if(!strcasecmp(argv[optind+1], "nodes"))
sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
else if(!strcasecmp(argv[optind+1], "edges"))
sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
else if(!strcasecmp(argv[optind+1], "subnets"))
sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
else if(!strcasecmp(argv[optind+1], "connections"))
sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
else if(!strcasecmp(argv[optind+1], "graph")) {
sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
do_graph = true;
printf("digraph {\n");
} else {
fprintf(stderr, "Unknown dump type '%s'.\n", argv[optind+1]);
usage(true);
return 1;
}
while(recvline(fd, line, sizeof line)) {
char node1[4096], node2[4096];
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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;
}
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if(!strcasecmp(argv[optind], "purge")) {
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 tinc daemon\n");
return 1;
}
return 0;
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}
if(!strcasecmp(argv[optind], "debug")) {
int debuglevel, origlevel;
if(argc != optind + 2) {
fprintf(stderr, "Invalid arguments.\n");
return 1;
}
debuglevel = atoi(argv[optind+1]);
sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel);
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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 purge tinc daemon\n");
return 1;
}
fprintf(stderr, "Old level %d, new level %d\n", origlevel, debuglevel);
return 0;
}
if(!strcasecmp(argv[optind], "connect")) {
if(argc != optind + 2) {
fprintf(stderr, "Invalid arguments.\n");
return 1;
}
char *name = argv[optind + 1];
sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, name);
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", name);
return 1;
}
return 0;
}
if(!strcasecmp(argv[optind], "disconnect")) {
if(argc != optind + 2) {
fprintf(stderr, "Invalid arguments.\n");
return 1;
}
char *name = argv[optind + 1];
sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, name);
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", name);
return 1;
}
return 0;
}
#ifdef HAVE_CURSES
if(!strcasecmp(argv[optind], "top")) {
top(fd);
return 0;
}
#endif
if(!strcasecmp(argv[optind], "pcap")) {
pcap(fd, stdout);
return 0;
}
fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);
usage(true);
close(fd);
return 0;
}