2 conf.c -- configuration code
3 Copyright (C) 1998 Robert van der Meulen
4 1998-2005 Ivo Timmermans
5 2000-2014 Guus Sliepen <guus@tinc-vpn.org>
6 2010-2011 Julien Muchembled <jm@jmuchemb.eu>
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License along
20 with this program; if not, write to the Free Software Foundation, Inc.,
21 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 #include "connection.h"
31 #include "netutl.h" /* for str2address */
33 #include "utils.h" /* for cp */
36 avl_tree_t *config_tree;
38 int pinginterval = 0; /* seconds between pings */
39 int pingtimeout = 0; /* seconds to wait for response */
40 char *confbase = NULL; /* directory in which all config files are */
41 char *netname = NULL; /* name of the vpn network */
42 list_t *cmdline_conf = NULL; /* global/host configuration values given at the command line */
45 static int config_compare(const config_t *a, const config_t *b) {
48 result = strcasecmp(a->variable, b->variable);
53 /* give priority to command line options */
54 result = !b->file - !a->file;
58 result = a->line - b->line;
63 return a->file ? strcmp(a->file, b->file) : 0;
66 void init_configuration(avl_tree_t ** config_tree) {
67 *config_tree = avl_alloc_tree((avl_compare_t) config_compare, (avl_action_t) free_config);
70 void exit_configuration(avl_tree_t ** config_tree) {
71 avl_delete_tree(*config_tree);
75 config_t *new_config(void) {
76 return xmalloc_and_zero(sizeof(config_t));
79 void free_config(config_t *cfg) {
92 void config_add(avl_tree_t *config_tree, config_t *cfg) {
93 avl_insert(config_tree, cfg);
96 config_t *lookup_config(const avl_tree_t *config_tree, char *variable) {
99 cfg.variable = variable;
103 found = avl_search_closest_greater(config_tree, &cfg);
108 if(strcasecmp(found->variable, variable))
114 config_t *lookup_config_next(const avl_tree_t *config_tree, const config_t *cfg) {
118 node = avl_search_node(config_tree, cfg);
122 found = node->next->data;
124 if(!strcasecmp(found->variable, cfg->variable))
132 bool get_config_bool(const config_t *cfg, bool *result) {
136 if(!strcasecmp(cfg->value, "yes")) {
139 } else if(!strcasecmp(cfg->value, "no")) {
144 logger(LOG_ERR, "\"yes\" or \"no\" expected for configuration variable %s in %s line %d",
145 cfg->variable, cfg->file, cfg->line);
150 bool get_config_int(const config_t *cfg, int *result) {
154 if(sscanf(cfg->value, "%d", result) == 1)
157 logger(LOG_ERR, "Integer expected for configuration variable %s in %s line %d",
158 cfg->variable, cfg->file, cfg->line);
163 bool get_config_string(const config_t *cfg, char **result) {
167 *result = xstrdup(cfg->value);
172 bool get_config_address(const config_t *cfg, struct addrinfo **result) {
178 ai = str2addrinfo(cfg->value, NULL, 0);
185 logger(LOG_ERR, "Hostname or IP address expected for configuration variable %s in %s line %d",
186 cfg->variable, cfg->file, cfg->line);
191 bool get_config_subnet(const config_t *cfg, subnet_t ** result) {
192 subnet_t subnet = {NULL};
197 if(!str2net(&subnet, cfg->value)) {
198 logger(LOG_ERR, "Subnet expected for configuration variable %s in %s line %d",
199 cfg->variable, cfg->file, cfg->line);
203 /* Teach newbies what subnets are... */
205 if(((subnet.type == SUBNET_IPV4)
206 && !maskcheck(&subnet.net.ipv4.address, subnet.net.ipv4.prefixlength, sizeof(ipv4_t)))
207 || ((subnet.type == SUBNET_IPV6)
208 && !maskcheck(&subnet.net.ipv6.address, subnet.net.ipv6.prefixlength, sizeof(ipv6_t)))) {
209 logger(LOG_ERR, "Network address and prefix length do not match for configuration variable %s in %s line %d",
210 cfg->variable, cfg->file, cfg->line);
214 *(*result = new_subnet()) = subnet;
220 Read exactly one line and strip the trailing newline if any.
222 static char *readline(FILE * fp, char *buf, size_t buflen) {
223 char *newline = NULL;
229 p = fgets(buf, buflen, fp);
234 newline = strchr(p, '\n');
239 *newline = '\0'; /* kill newline */
240 if(newline > p && newline[-1] == '\r') /* and carriage return if necessary */
246 config_t *parse_config_line(char *line, const char *fname, int lineno) {
249 char *variable, *value, *eol;
250 variable = value = line;
252 eol = line + strlen(line);
253 while(strchr("\t ", *--eol))
256 len = strcspn(value, "\t =");
258 value += strspn(value, "\t ");
261 value += strspn(value, "\t ");
263 variable[len] = '\0';
266 const char err[] = "No value for variable";
268 logger(LOG_ERR, "%s `%s' on line %d while reading config file %s",
269 err, variable, lineno, fname);
271 logger(LOG_ERR, "%s `%s' in command line option %d",
272 err, variable, lineno);
277 cfg->variable = xstrdup(variable);
278 cfg->value = xstrdup(value);
279 cfg->file = fname ? xstrdup(fname) : NULL;
286 Parse a configuration file and put the results in the configuration tree
289 bool read_config_file(avl_tree_t *config_tree, const char *fname) {
291 char buffer[MAX_STRING_SIZE];
298 fp = fopen(fname, "r");
301 logger(LOG_ERR, "Cannot open config file %s: %s", fname, strerror(errno));
306 line = readline(fp, buffer, sizeof buffer);
316 if(!*line || *line == '#')
320 if(!strncmp(line, "-----END", 8))
325 if(!strncmp(line, "-----BEGIN", 10)) {
330 cfg = parse_config_line(line, fname, lineno);
333 config_add(config_tree, cfg);
341 void read_config_options(avl_tree_t *config_tree, const char *prefix) {
342 size_t prefix_len = prefix ? strlen(prefix) : 0;
344 for(const list_node_t *node = cmdline_conf->tail; node; node = node->prev) {
345 const config_t *cfg = node->data;
348 if(strchr(cfg->variable, '.'))
351 if(strncmp(prefix, cfg->variable, prefix_len) ||
352 cfg->variable[prefix_len] != '.')
356 config_t *new = new_config();
359 new->variable = xstrdup(cfg->variable + prefix_len + 1);
361 new->variable = xstrdup(cfg->variable);
364 new->value = xstrdup(cfg->value);
366 new->line = cfg->line;
368 config_add(config_tree, new);
372 bool read_server_config(void) {
373 char fname[PATH_MAX];
376 read_config_options(config_tree, NULL);
378 snprintf(fname, sizeof fname, "%s/tinc.conf", confbase);
380 x = read_config_file(config_tree, fname);
382 // We will try to read the conf files in the "conf.d" dir
384 char dname[PATH_MAX];
385 snprintf(dname, sizeof dname, "%s/conf.d", confbase);
386 DIR *dir = opendir (dname);
387 // If we can find this dir
390 // We list all the files in it
391 while (x && (ep = readdir (dir))) {
392 size_t l = strlen(ep->d_name);
393 // And we try to read the ones that end with ".conf"
394 if (l > 5 && !strcmp(".conf", & ep->d_name[ l - 5 ])) {
395 snprintf(fname, sizeof fname, "%s/%s", dname, ep->d_name);
396 x = read_config_file(config_tree, fname);
404 logger(LOG_ERR, "Failed to read `%s': %s", fname, strerror(errno));
410 bool read_connection_config(connection_t *c) {
411 char fname[PATH_MAX];
414 read_config_options(c->config_tree, c->name);
416 snprintf(fname, sizeof fname, "%s/hosts/%s", confbase, c->name);
417 x = read_config_file(c->config_tree, fname);
422 static void disable_old_keys(const char *filename) {
423 char tmpfile[PATH_MAX] = "";
425 bool disabled = false;
428 r = fopen(filename, "r");
432 snprintf(tmpfile, sizeof tmpfile, "%s.tmp", filename);
434 w = fopen(tmpfile, "w");
436 while(fgets(buf, sizeof buf, r)) {
437 if(!strncmp(buf, "-----BEGIN RSA", 14)) {
443 else if(!strncmp(buf, "-----END RSA", 12)) {
449 if(w && fputs(buf, w) < 0) {
460 fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
466 // We cannot atomically replace files on Windows.
467 char bakfile[PATH_MAX] = "";
468 snprintf(bakfile, sizeof bakfile, "%s.bak", filename);
469 if(rename(filename, bakfile) || rename(tmpfile, filename)) {
470 rename(bakfile, filename);
472 if(rename(tmpfile, filename)) {
474 fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
479 fprintf(stderr, "Warning: old key(s) found and disabled.\n");
486 FILE *ask_and_open(const char *filename, const char *what) {
492 /* Check stdin and stdout */
493 if(!isatty(0) || !isatty(1)) {
494 /* Argh, they are running us from a script or something. Write
495 the files to the current directory and let them burn in hell
499 /* Ask for a file and/or directory name. */
500 fprintf(stdout, "Please enter a file to save %s to [%s]: ",
504 fn = readline(stdin, line, sizeof line);
507 fprintf(stderr, "Error while reading stdin: %s\n",
513 /* User just pressed enter. */
518 if(fn[0] != '\\' && fn[0] != '/' && !strchr(fn, ':')) {
522 /* The directory is a relative path or a filename. */
525 directory = get_current_dir_name();
526 xasprintf(&p, "%s/%s", directory, fn);
531 umask(0077); /* Disallow everything for group and other */
533 disable_old_keys(fn);
535 /* Open it first to keep the inode busy */
540 fprintf(stderr, "Error opening file `%s': %s\n",
541 fn, strerror(errno));