2 conf.c -- configuration code
3 Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 #include "splay_tree.h"
24 #include "connection.h"
28 #include "meshlink_internal.h"
29 #include "netutl.h" /* for str2address */
31 #include "utils.h" /* for cp */
34 static int config_compare(const config_t *a, const config_t *b) {
37 result = strcasecmp(a->variable, b->variable);
42 result = a->line - b->line;
47 return a->file ? strcmp(a->file, b->file) : 0;
50 void init_configuration(splay_tree_t **config_tree) {
51 *config_tree = splay_alloc_tree((splay_compare_t) config_compare, (splay_action_t) free_config);
54 void exit_configuration(splay_tree_t **config_tree) {
56 splay_delete_tree(*config_tree);
60 config_t *new_config(void) {
61 return xzalloc(sizeof(config_t));
64 void free_config(config_t *cfg) {
77 void config_add(splay_tree_t *config_tree, config_t *cfg) {
78 splay_insert(config_tree, cfg);
81 config_t *lookup_config(splay_tree_t *config_tree, char *variable) {
84 cfg.variable = variable;
88 found = splay_search_closest_greater(config_tree, &cfg);
93 if(strcasecmp(found->variable, variable))
99 config_t *lookup_config_next(splay_tree_t *config_tree, const config_t *cfg) {
103 node = splay_search_node(config_tree, cfg);
107 found = node->next->data;
109 if(!strcasecmp(found->variable, cfg->variable))
117 bool get_config_bool(const config_t *cfg, bool *result) {
121 if(!strcasecmp(cfg->value, "yes")) {
124 } else if(!strcasecmp(cfg->value, "no")) {
129 logger(NULL, MESHLINK_ERROR, "\"yes\" or \"no\" expected for configuration variable %s in %s line %d",
130 cfg->variable, cfg->file, cfg->line);
135 bool get_config_int(const config_t *cfg, int *result) {
139 if(sscanf(cfg->value, "%d", result) == 1)
142 logger(NULL, MESHLINK_ERROR, "Integer expected for configuration variable %s in %s line %d",
143 cfg->variable, cfg->file, cfg->line);
148 bool set_config_int(config_t *cfg, int val)
154 snprintf(val_str, sizeof(val_str), "%d", val);
159 cfg->value = xstrdup(val_str);
164 bool get_config_string(const config_t *cfg, char **result) {
168 *result = xstrdup(cfg->value);
173 bool set_config_string(config_t *cfg, const char* val)
181 cfg->value = xstrdup(val);
186 bool get_config_address(const config_t *cfg, struct addrinfo **result) {
192 ai = str2addrinfo(cfg->value, NULL, 0);
199 logger(NULL, MESHLINK_ERROR, "Hostname or IP address expected for configuration variable %s in %s line %d",
200 cfg->variable, cfg->file, cfg->line);
206 Read exactly one line and strip the trailing newline if any.
208 static char *readline(FILE * fp, char *buf, size_t buflen) {
209 char *newline = NULL;
215 p = fgets(buf, buflen, fp);
220 newline = strchr(p, '\n');
225 /* kill newline and carriage return if necessary */
227 if(newline > p && newline[-1] == '\r')
233 config_t *parse_config_line(char *line, const char *fname, int lineno) {
236 char *variable, *value, *eol;
237 variable = value = line;
239 eol = line + strlen(line);
240 while(strchr("\t ", *--eol))
243 len = strcspn(value, "\t =");
245 value += strspn(value, "\t ");
248 value += strspn(value, "\t ");
250 variable[len] = '\0';
253 const char err[] = "No value for variable";
254 logger(NULL, MESHLINK_ERROR, "%s `%s' on line %d while reading config file %s",
255 err, variable, lineno, fname);
260 cfg->variable = xstrdup(variable);
261 cfg->value = xstrdup(value);
262 cfg->file = xstrdup(fname);
269 Parse a configuration file and put the results in the configuration tree
272 bool read_config_file(splay_tree_t *config_tree, const char *fname) {
274 char buffer[MAX_STRING_SIZE];
281 fp = fopen(fname, "r");
284 logger(NULL, MESHLINK_ERROR, "Cannot open config file %s: %s", fname, strerror(errno));
289 line = readline(fp, buffer, sizeof buffer);
299 if(!*line || *line == '#')
303 if(!strncmp(line, "-----END", 8))
308 if(!strncmp(line, "-----BEGIN", 10)) {
313 cfg = parse_config_line(line, fname, lineno);
316 config_add(config_tree, cfg);
324 bool write_config_file(const struct splay_tree_t *config_tree, const char *fname)
328 fp = fopen(fname, "w+");
331 logger(NULL, MESHLINK_ERROR, "Cannot open config file %s: %s", fname, strerror(errno));
335 for splay_each(config_t, cnf, config_tree)
337 if(fwrite(cnf->variable, sizeof(char), strlen(cnf->variable), fp) < strlen(cnf->variable))
340 if(fwrite(" = ", sizeof(char), 3, fp) < 3)
343 if(fwrite(cnf->value, sizeof(char), strlen(cnf->value), fp) < strlen(cnf->value))
346 if(fwrite("\n", sizeof(char), 1, fp) < 1)
354 logger(NULL, MESHLINK_ERROR, "Cannot write to config file %s: %s", fname, strerror(errno));
359 bool read_server_config(meshlink_handle_t *mesh) {
360 char filename[PATH_MAX];
363 snprintf(filename, PATH_MAX,"%s" SLASH "meshlink.conf", mesh->confbase);
365 x = read_config_file(mesh->config, filename);
368 logger(mesh, MESHLINK_ERROR, "Failed to read `%s': %s", filename, strerror(errno));
373 bool read_host_config(meshlink_handle_t *mesh, splay_tree_t *config_tree, const char *name) {
374 char filename[PATH_MAX];
377 snprintf(filename,PATH_MAX, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
378 x = read_config_file(config_tree, filename);
383 bool write_host_config(struct meshlink_handle *mesh, const struct splay_tree_t *config_tree, const char *name)
385 char filename[PATH_MAX];
387 snprintf(filename,PATH_MAX, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
388 return write_config_file(config_tree, filename);
391 bool modify_config_file(struct meshlink_handle *mesh, const char *name, const char *key, const char *value, bool replace) {
392 assert(mesh && name && key && (replace || value));
394 char filename[PATH_MAX];
395 char tmpname[PATH_MAX];
398 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
399 snprintf(tmpname, sizeof tmpname, "%s.tmp", filename);
401 FILE *fr = fopen(filename, "r");
404 logger(mesh, MESHLINK_ERROR, "Cannot open config file %s: %s", filename, strerror(errno));
408 FILE *fw = fopen(tmpname, "w");
411 logger(mesh, MESHLINK_ERROR, "Cannot open temporary file %s: %s", tmpname, strerror(errno));
420 while(readline(fr, buf, sizeof buf)) {
421 if(!*buf || *buf == '#')
424 sep = strchr(buf, ' ');
429 if(strcmp(buf, key)) {
439 // We found the key and the value. Keep one copy around.
440 if(sep[1] == '=' && sep[2] == ' ' && !strcmp(sep + 3, value)) {
446 // We found the key but with a different value, delete it if wanted.
447 if(!found && replace)
453 fprintf(fw, "%s\n", buf);
461 // Add new key/value pair if necessary
463 fprintf(fw, "%s = %s\n", key, value);
471 // If any error occured during reading or writing, exit.
477 // Try to atomically replace the old config file with the new one.
479 char bakname[PATH_MAX];
480 snprintf(bakname, sizeof bakname, "%s.bak", filename);
481 if(rename(filename, bakname) || rename(tmpname, filename)) {
482 rename(bakname, filename);
484 if(rename(tmpname, filename)) {
495 bool append_config_file(meshlink_handle_t *mesh, const char *name, const char *key, const char *value) {
496 return modify_config_file(mesh, name, key, value, false);