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) {
153 snprintf(val_str, sizeof(val_str), "%d", val);
158 cfg->value = xstrdup(val_str);
163 bool get_config_string(const config_t *cfg, char **result) {
167 *result = xstrdup(cfg->value);
172 bool set_config_string(config_t *cfg, const char *val) {
179 cfg->value = xstrdup(val);
184 bool get_config_address(const config_t *cfg, struct addrinfo **result) {
190 ai = str2addrinfo(cfg->value, NULL, 0);
197 logger(NULL, MESHLINK_ERROR, "Hostname or IP address expected for configuration variable %s in %s line %d",
198 cfg->variable, cfg->file, cfg->line);
204 Read exactly one line and strip the trailing newline if any.
206 static char *readline(FILE *fp, char *buf, size_t buflen) {
207 char *newline = NULL;
213 p = fgets(buf, buflen, fp);
218 newline = strchr(p, '\n');
223 /* kill newline and carriage return if necessary */
225 if(newline > p && newline[-1] == '\r')
231 config_t *parse_config_line(char *line, const char *fname, int lineno) {
234 char *variable, *value, *eol;
235 variable = value = line;
237 eol = line + strlen(line);
238 while(strchr("\t ", *--eol))
241 len = strcspn(value, "\t =");
243 value += strspn(value, "\t ");
246 value += strspn(value, "\t ");
248 variable[len] = '\0';
251 const char err[] = "No value for variable";
252 logger(NULL, MESHLINK_ERROR, "%s `%s' on line %d while reading config file %s",
253 err, variable, lineno, fname);
258 cfg->variable = xstrdup(variable);
259 cfg->value = xstrdup(value);
260 cfg->file = xstrdup(fname);
267 Parse a configuration file and put the results in the configuration tree
270 bool read_config_file(splay_tree_t *config_tree, const char *fname) {
272 char buffer[MAX_STRING_SIZE];
279 fp = fopen(fname, "r");
282 logger(NULL, MESHLINK_ERROR, "Cannot open config file %s: %s", fname, strerror(errno));
287 line = readline(fp, buffer, sizeof(buffer));
297 if(!*line || *line == '#')
301 if(!strncmp(line, "-----END", 8))
306 if(!strncmp(line, "-----BEGIN", 10)) {
311 cfg = parse_config_line(line, fname, lineno);
314 config_add(config_tree, cfg);
322 bool write_config_file(const struct splay_tree_t *config_tree, const char *fname) {
325 fp = fopen(fname, "w+");
328 logger(NULL, MESHLINK_ERROR, "Cannot open config file %s: %s", fname, strerror(errno));
332 for splay_each(config_t, cnf, config_tree) {
333 if(fwrite(cnf->variable, sizeof(char), strlen(cnf->variable), fp) < strlen(cnf->variable))
336 if(fwrite(" = ", sizeof(char), 3, fp) < 3)
339 if(fwrite(cnf->value, sizeof(char), strlen(cnf->value), fp) < strlen(cnf->value))
342 if(fwrite("\n", sizeof(char), 1, fp) < 1)
350 logger(NULL, MESHLINK_ERROR, "Cannot write to config file %s: %s", fname, strerror(errno));
355 bool read_server_config(meshlink_handle_t *mesh) {
356 char filename[PATH_MAX];
359 snprintf(filename, PATH_MAX, "%s" SLASH "meshlink.conf", mesh->confbase);
361 x = read_config_file(mesh->config, filename);
364 logger(mesh, MESHLINK_ERROR, "Failed to read `%s': %s", filename, strerror(errno));
369 bool read_host_config(meshlink_handle_t *mesh, splay_tree_t *config_tree, const char *name) {
370 char filename[PATH_MAX];
373 snprintf(filename, PATH_MAX, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
374 x = read_config_file(config_tree, filename);
379 bool write_host_config(struct meshlink_handle *mesh, const struct splay_tree_t *config_tree, const char *name) {
380 char filename[PATH_MAX];
382 snprintf(filename, PATH_MAX, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
383 return write_config_file(config_tree, filename);
386 bool modify_config_file(struct meshlink_handle *mesh, const char *name, const char *key, const char *value, bool replace) {
387 assert(mesh && name && key && (replace || value));
389 char filename[PATH_MAX];
390 char tmpname[PATH_MAX];
393 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
394 snprintf(tmpname, sizeof(tmpname), "%s.tmp", filename);
396 FILE *fr = fopen(filename, "r");
399 logger(mesh, MESHLINK_ERROR, "Cannot open config file %s: %s", filename, strerror(errno));
403 FILE *fw = fopen(tmpname, "w");
406 logger(mesh, MESHLINK_ERROR, "Cannot open temporary file %s: %s", tmpname, strerror(errno));
415 while(readline(fr, buf, sizeof(buf))) {
416 if(!*buf || *buf == '#')
419 sep = strchr(buf, ' ');
424 if(strcmp(buf, key)) {
434 // We found the key and the value. Keep one copy around.
435 if(sep[1] == '=' && sep[2] == ' ' && !strcmp(sep + 3, value)) {
441 // We found the key but with a different value, delete it if wanted.
442 if(!found && replace)
448 fprintf(fw, "%s\n", buf);
456 // Add new key/value pair if necessary
458 fprintf(fw, "%s = %s\n", key, value);
466 // If any error occured during reading or writing, exit.
472 // Try to atomically replace the old config file with the new one.
474 char bakname[PATH_MAX];
475 snprintf(bakname, sizeof(bakname), "%s.bak", filename);
476 if(rename(filename, bakname) || rename(tmpname, filename)) {
477 rename(bakname, filename);
479 if(rename(tmpname, filename)) {
490 bool append_config_file(meshlink_handle_t *mesh, const char *name, const char *key, const char *value) {
491 return modify_config_file(mesh, name, key, value, false);