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);
43 return result = a->line - b->line;
46 void init_configuration(splay_tree_t **config_tree) {
47 *config_tree = splay_alloc_tree((splay_compare_t) config_compare, (splay_action_t) free_config);
50 void exit_configuration(splay_tree_t **config_tree) {
52 splay_delete_tree(*config_tree);
58 config_t *new_config(void) {
59 return xzalloc(sizeof(config_t));
62 void free_config(config_t *cfg) {
68 void config_add(splay_tree_t *config_tree, config_t *cfg) {
69 splay_insert(config_tree, cfg);
72 config_t *lookup_config(splay_tree_t *config_tree, char *variable) {
75 cfg.variable = variable;
78 found = splay_search_closest_greater(config_tree, &cfg);
84 if(strcasecmp(found->variable, variable)) {
91 config_t *lookup_config_next(splay_tree_t *config_tree, const config_t *cfg) {
95 node = splay_search_node(config_tree, cfg);
99 found = node->next->data;
101 if(!strcasecmp(found->variable, cfg->variable)) {
110 bool get_config_bool(const config_t *cfg, bool *result) {
115 if(!strcasecmp(cfg->value, "yes")) {
118 } else if(!strcasecmp(cfg->value, "no")) {
123 logger(NULL, MESHLINK_ERROR, "\"yes\" or \"no\" expected for configuration variable %s in line %d",
124 cfg->variable, cfg->line);
129 bool get_config_int(const config_t *cfg, int *result) {
134 if(sscanf(cfg->value, "%d", result) == 1) {
138 logger(NULL, MESHLINK_ERROR, "Integer expected for configuration variable %s in line %d",
139 cfg->variable, cfg->line);
144 bool set_config_int(config_t *cfg, int val) {
150 snprintf(val_str, sizeof(val_str), "%d", val);
156 cfg->value = xstrdup(val_str);
161 bool get_config_string(const config_t *cfg, char **result) {
166 *result = xstrdup(cfg->value);
171 bool set_config_string(config_t *cfg, const char *val) {
180 cfg->value = xstrdup(val);
185 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 line %d",
200 cfg->variable, 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;
216 p = fgets(buf, buflen, fp);
222 newline = strchr(p, '\n');
228 /* kill newline and carriage return if necessary */
231 if(newline > p && newline[-1] == '\r') {
238 config_t *parse_config_line(char *line, const char *fname, int lineno) {
241 char *variable, *value, *eol;
242 variable = value = line;
244 eol = line + strlen(line);
246 while(strchr("\t ", *--eol)) {
250 len = strcspn(value, "\t =");
252 value += strspn(value, "\t ");
256 value += strspn(value, "\t ");
259 variable[len] = '\0';
262 const char err[] = "No value for variable";
263 logger(NULL, MESHLINK_ERROR, "%s `%s' on line %d while reading config file %s",
264 err, variable, lineno, fname);
269 cfg->variable = xstrdup(variable);
270 cfg->value = xstrdup(value);
277 Parse a configuration file and put the results in the configuration tree
280 bool read_config_file(splay_tree_t *config_tree, const char *fname) {
282 char buffer[MAX_STRING_SIZE];
289 fp = fopen(fname, "r");
292 logger(NULL, MESHLINK_ERROR, "Cannot open config file %s: %s", fname, strerror(errno));
297 line = readline(fp, buffer, sizeof(buffer));
309 if(!*line || *line == '#') {
314 if(!strncmp(line, "-----END", 8)) {
321 if(!strncmp(line, "-----BEGIN", 10)) {
326 cfg = parse_config_line(line, fname, lineno);
332 config_add(config_tree, cfg);
340 bool write_config_file(const struct splay_tree_t *config_tree, const char *fname) {
343 fp = fopen(fname, "w+");
346 logger(NULL, MESHLINK_ERROR, "Cannot open config file %s: %s", fname, strerror(errno));
350 for splay_each(config_t, cnf, config_tree) {
351 if(fwrite(cnf->variable, sizeof(char), strlen(cnf->variable), fp) < strlen(cnf->variable)) {
355 if(fwrite(" = ", sizeof(char), 3, fp) < 3) {
359 if(fwrite(cnf->value, sizeof(char), strlen(cnf->value), fp) < strlen(cnf->value)) {
363 if(fwrite("\n", sizeof(char), 1, fp) < 1) {
372 logger(NULL, MESHLINK_ERROR, "Cannot write to config file %s: %s", fname, strerror(errno));
377 bool read_server_config(meshlink_handle_t *mesh) {
378 char filename[PATH_MAX];
381 snprintf(filename, PATH_MAX, "%s" SLASH "meshlink.conf", mesh->confbase);
383 x = read_config_file(mesh->config, filename);
386 logger(mesh, MESHLINK_ERROR, "Failed to read `%s': %s", filename, strerror(errno));
392 bool read_host_config(meshlink_handle_t *mesh, splay_tree_t *config_tree, const char *name) {
393 char filename[PATH_MAX];
396 snprintf(filename, PATH_MAX, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
397 x = read_config_file(config_tree, filename);
402 bool write_host_config(struct meshlink_handle *mesh, const struct splay_tree_t *config_tree, const char *name) {
403 char filename[PATH_MAX];
405 snprintf(filename, PATH_MAX, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
406 return write_config_file(config_tree, filename);
409 bool modify_config_file(struct meshlink_handle *mesh, const char *name, const char *key, const char *value, int trim) {
410 assert(mesh && name && key);
412 char filename[PATH_MAX];
413 char tmpname[PATH_MAX];
416 if(snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name) >= PATH_MAX) {
417 logger(mesh, MESHLINK_ERROR, "Filename too long: %s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
421 if(snprintf(tmpname, sizeof(tmpname), "%s.tmp", filename) >= PATH_MAX) {
422 logger(mesh, MESHLINK_ERROR, "Filename too long: %s.tmp", filename);
426 FILE *fr = fopen(filename, "r");
429 logger(mesh, MESHLINK_ERROR, "Cannot open config file %s: %s", filename, strerror(errno));
433 FILE *fw = fopen(tmpname, "w");
436 logger(mesh, MESHLINK_ERROR, "Cannot open temporary file %s: %s", tmpname, strerror(errno));
446 fprintf(fw, "%s = %s\n", key, value);
450 while(readline(fr, buf, sizeof(buf))) {
451 if(!*buf || *buf == '#') {
455 sep = strchr(buf, ' ');
463 if(strcmp(buf, key)) {
468 // We found the key and the value. We already added it at the top, so ignore this one.
469 if(value && sep[1] == '=' && sep[2] == ' ' && !strcmp(sep + 3, value)) {
473 // We found the key but with a different value, delete it if wanted.
476 if((!value || trim) && found > trim) {
483 fprintf(fw, "%s\n", buf);
500 // If any error occured during reading or writing, exit.
506 // Try to atomically replace the old config file with the new one.
508 char bakname[PATH_MAX];
509 snprintf(bakname, sizeof(bakname), "%s.bak", filename);
511 if(rename(filename, bakname) || rename(tmpname, filename)) {
512 rename(bakname, filename);
515 if(rename(tmpname, filename)) {
526 bool append_config_file(meshlink_handle_t *mesh, const char *name, const char *key, const char *value) {
527 return modify_config_file(mesh, name, key, value, 0);