/*
conf.c -- configuration code
- Copyright (C) 1998 Emphyrio,
- Copyright (C) 1998,1999,2000 Ivo Timmermans <itimmermans@bigfoot.com>
- 2000 Guus Sliepen <guus@sliepen.warande.net>
- 2000 Cris van Pelt <tribbel@arise.dhs.org>
+ Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
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
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., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id: conf.c,v 1.9.4.14 2000/10/15 00:59:34 guus Exp $
+ 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 <assert.h>
-#include <ctype.h>
-#include <errno.h>
-#include <netdb.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <syslog.h>
+#include "splay_tree.h"
+#include "connection.h"
+#include "conf.h"
+#include "list.h"
+#include "logger.h"
+#include "meshlink_internal.h"
+#include "netutl.h" /* for str2address */
+#include "protocol.h"
+#include "utils.h" /* for cp */
+#include "xalloc.h"
-#include <xalloc.h>
+static int config_compare(const config_t *a, const config_t *b) {
+ int result;
-#include "conf.h"
-#include "netutl.h" /* for strtoip */
-#include <utils.h> /* for cp */
+ result = strcasecmp(a->variable, b->variable);
-#include "config.h"
-#include "connlist.h"
-#include "system.h"
+ if(result) {
+ return result;
+ }
-config_t *config = NULL;
-int debug_lvl = 0;
-int timeout = 0; /* seconds before timeout */
-char *confbase = NULL; /* directory in which all config files are */
-char *netname = NULL; /* name of the vpn network */
+ return result = a->line - b->line;
+}
-/* Will be set if HUP signal is received. It will be processed when it is safe. */
-int sighup = 0;
+void init_configuration(splay_tree_t **config_tree) {
+ *config_tree = splay_alloc_tree((splay_compare_t) config_compare, (splay_action_t) free_config);
+}
-/*
- These are all the possible configurable values
-*/
-static internal_config_t hazahaza[] = {
-/* Main configuration file keywords */
- { "Name", tincname, TYPE_NAME },
- { "ConnectTo", connectto, TYPE_NAME },
- { "PingTimeout", pingtimeout, TYPE_INT },
- { "TapDevice", tapdevice, TYPE_NAME },
- { "TapSubnet", tapsubnet, TYPE_IP },
- { "PrivateKey", privatekey, TYPE_NAME },
- { "KeyExpire", keyexpire, TYPE_INT },
- { "Hostnames", resolve_dns, TYPE_BOOL },
- { "Interface", interface, TYPE_NAME },
- { "InterfaceIP", interfaceip, TYPE_IP },
-/* Host configuration file keywords */
- { "Address", address, TYPE_NAME },
- { "Port", port, TYPE_INT },
- { "PublicKey", publickey, TYPE_NAME },
- { "Subnet", subnet, TYPE_NAME },
- { "RestrictHosts", restricthosts, TYPE_BOOL },
- { "RestrictSubnets", restrictsubnets, TYPE_BOOL },
- { "RestrictAddress", restrictaddress, TYPE_BOOL },
- { "RestrictPort", restrictport, TYPE_BOOL },
- { "IndirectData", indirectdata, TYPE_BOOL },
- { "TCPonly", tcponly, TYPE_BOOL },
- { NULL, 0, 0 }
-};
+void exit_configuration(splay_tree_t **config_tree) {
+ if(*config_tree) {
+ splay_delete_tree(*config_tree);
+ }
+
+ *config_tree = NULL;
+}
+
+config_t *new_config(void) {
+ return xzalloc(sizeof(config_t));
+}
+
+void free_config(config_t *cfg) {
+ free(cfg->variable);
+ free(cfg->value);
+ free(cfg);
+}
+
+void config_add(splay_tree_t *config_tree, config_t *cfg) {
+ splay_insert(config_tree, cfg);
+}
+
+config_t *lookup_config(splay_tree_t *config_tree, char *variable) {
+ config_t cfg, *found;
+
+ cfg.variable = variable;
+ cfg.line = 0;
+
+ found = splay_search_closest_greater(config_tree, &cfg);
+
+ if(!found) {
+ return NULL;
+ }
+
+ if(strcasecmp(found->variable, variable)) {
+ return NULL;
+ }
+
+ return found;
+}
+
+config_t *lookup_config_next(splay_tree_t *config_tree, const config_t *cfg) {
+ splay_node_t *node;
+ config_t *found;
+
+ node = splay_search_node(config_tree, cfg);
+
+ if(node) {
+ if(node->next) {
+ found = node->next->data;
+
+ if(!strcasecmp(found->variable, cfg->variable)) {
+ return found;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+bool get_config_bool(const config_t *cfg, bool *result) {
+ if(!cfg) {
+ return false;
+ }
+
+ if(!strcasecmp(cfg->value, "yes")) {
+ *result = true;
+ return true;
+ } else if(!strcasecmp(cfg->value, "no")) {
+ *result = false;
+ return true;
+ }
+
+ logger(NULL, MESHLINK_ERROR, "\"yes\" or \"no\" expected for configuration variable %s in line %d",
+ cfg->variable, cfg->line);
+
+ return false;
+}
+
+bool get_config_int(const config_t *cfg, int *result) {
+ if(!cfg) {
+ return false;
+ }
+
+ if(sscanf(cfg->value, "%d", result) == 1) {
+ return true;
+ }
+
+ logger(NULL, MESHLINK_ERROR, "Integer expected for configuration variable %s in line %d",
+ cfg->variable, cfg->line);
+
+ return false;
+}
+
+bool set_config_int(config_t *cfg, int val) {
+ if(!cfg) {
+ return false;
+ }
+
+ char val_str[1024];
+ snprintf(val_str, sizeof(val_str), "%d", val);
+
+ if(cfg->value) {
+ free(cfg->value);
+ }
+
+ cfg->value = xstrdup(val_str);
+
+ return true;
+}
+
+bool get_config_string(const config_t *cfg, char **result) {
+ if(!cfg) {
+ return false;
+ }
+
+ *result = xstrdup(cfg->value);
+
+ return true;
+}
+
+bool set_config_string(config_t *cfg, const char *val) {
+ if(!cfg) {
+ return false;
+ }
+
+ if(cfg->value) {
+ free(cfg->value);
+ }
+
+ cfg->value = xstrdup(val);
+
+ return true;
+}
+
+bool get_config_address(const config_t *cfg, struct addrinfo **result) {
+ struct addrinfo *ai;
+
+ if(!cfg) {
+ return false;
+ }
+
+ ai = str2addrinfo(cfg->value, NULL, 0);
+
+ if(ai) {
+ *result = ai;
+ return true;
+ }
+
+ logger(NULL, MESHLINK_ERROR, "Hostname or IP address expected for configuration variable %s in line %d",
+ cfg->variable, cfg->line);
+
+ return false;
+}
/*
- Add given value to the list of configs cfg
+ Read exactly one line and strip the trailing newline if any.
*/
-config_t *
-add_config_val(config_t **cfg, int argtype, char *val)
-{
- config_t *p, *r;
- char *q;
-cp
- p = (config_t*)xmalloc(sizeof(*p));
- p->data.val = 0;
-
- switch(argtype)
- {
- case TYPE_INT:
- p->data.val = strtol(val, &q, 0);
- if(q && *q)
- p->data.val = 0;
- break;
- case TYPE_NAME:
- p->data.ptr = xmalloc(strlen(val) + 1);
- strcpy(p->data.ptr, val);
- break;
- case TYPE_IP:
- p->data.ip = strtoip(val);
- break;
- case TYPE_BOOL:
- if(!strcasecmp("yes", val))
- p->data.val = stupid_true;
- else if(!strcasecmp("no", val))
- p->data.val = stupid_false;
- else
- p->data.val = 0;
- }
-
- p->argtype = argtype;
-
- if(p->data.val)
- {
- p->next = *cfg;
- *cfg = p;
-cp
- return p;
- }
- else
- {
- free(p);
-cp
- return NULL;
- }
+static char *readline(FILE *fp, char *buf, size_t buflen) {
+ char *newline = NULL;
+ char *p;
+
+ if(feof(fp)) {
+ return NULL;
+ }
+
+ p = fgets(buf, buflen, fp);
+
+ if(!p) {
+ return NULL;
+ }
+
+ newline = strchr(p, '\n');
+
+ if(!newline) {
+ return buf;
+ }
+
+ /* kill newline and carriage return if necessary */
+ *newline = '\0';
+
+ if(newline > p && newline[-1] == '\r') {
+ newline[-1] = '\0';
+ }
+
+ return buf;
+}
+
+config_t *parse_config_line(char *line, const char *fname, int lineno) {
+ config_t *cfg;
+ int len;
+ char *variable, *value, *eol;
+ variable = value = line;
+
+ eol = line + strlen(line);
+
+ while(strchr("\t ", *--eol)) {
+ *eol = '\0';
+ }
+
+ len = strcspn(value, "\t =");
+ value += len;
+ value += strspn(value, "\t ");
+
+ if(*value == '=') {
+ value++;
+ value += strspn(value, "\t ");
+ }
+
+ variable[len] = '\0';
+
+ if(!*value) {
+ const char err[] = "No value for variable";
+ logger(NULL, MESHLINK_ERROR, "%s `%s' on line %d while reading config file %s",
+ err, variable, lineno, fname);
+ return NULL;
+ }
+
+ cfg = new_config();
+ cfg->variable = xstrdup(variable);
+ cfg->value = xstrdup(value);
+ cfg->line = lineno;
+
+ return cfg;
}
/*
Parse a configuration file and put the results in the configuration tree
starting at *base.
*/
-int read_config_file(config_t **base, const char *fname)
-{
- int err = -1;
- FILE *fp;
- char line[MAXBUFSIZE]; /* There really should not be any line longer than this... */
- char *p, *q;
- int i, lineno = 0;
- config_t *cfg;
-cp
- if((fp = fopen (fname, "r")) == NULL)
- {
- return -1;
- }
-
- for(;;)
- {
- if(fgets(line, MAXBUFSIZE, fp) == NULL)
- {
- err = 0;
- break;
- }
-
- lineno++;
-
- if(!index(line, '\n'))
- {
- syslog(LOG_ERR, _("Line %d too long while reading config file %s"), lineno, fname);
- break;
- }
-
- if((p = strtok(line, "\t\n\r =")) == NULL)
- continue; /* no tokens on this line */
-
- if(p[0] == '#')
- continue; /* comment: ignore */
-
- for(i = 0; hazahaza[i].name != NULL; i++)
- if(!strcasecmp(hazahaza[i].name, p))
- break;
-
- if(!hazahaza[i].name)
- {
- syslog(LOG_ERR, _("Invalid variable name on line %d while reading config file %s"),
- lineno, fname);
- break;
- }
-
- if(((q = strtok(NULL, "\t\n\r =")) == NULL) || q[0] == '#')
- {
- fprintf(stderr, _("No value for variable on line %d while reading config file %s"),
- lineno, fname);
- break;
- }
-
- cfg = add_config_val(base, hazahaza[i].argtype, q);
- if(cfg == NULL)
- {
- fprintf(stderr, _("Invalid value for variable on line %d while reading config file %s"),
- lineno, fname);
- break;
- }
-
- cfg->which = hazahaza[i].which;
- if(!config)
- config = cfg;
- }
-
- fclose (fp);
-cp
- return err;
+bool read_config_file(splay_tree_t *config_tree, const char *fname) {
+ FILE *fp;
+ char buffer[MAX_STRING_SIZE];
+ char *line;
+ int lineno = 0;
+ bool ignore = false;
+ config_t *cfg;
+ bool result = false;
+
+ fp = fopen(fname, "r");
+
+ if(!fp) {
+ logger(NULL, MESHLINK_ERROR, "Cannot open config file %s: %s", fname, strerror(errno));
+ return false;
+ }
+
+ for(;;) {
+ line = readline(fp, buffer, sizeof(buffer));
+
+ if(!line) {
+ if(feof(fp)) {
+ result = true;
+ }
+
+ break;
+ }
+
+ lineno++;
+
+ if(!*line || *line == '#') {
+ continue;
+ }
+
+ if(ignore) {
+ if(!strncmp(line, "-----END", 8)) {
+ ignore = false;
+ }
+
+ continue;
+ }
+
+ if(!strncmp(line, "-----BEGIN", 10)) {
+ ignore = true;
+ continue;
+ }
+
+ cfg = parse_config_line(line, fname, lineno);
+
+ if(!cfg) {
+ break;
+ }
+
+ config_add(config_tree, cfg);
+ }
+
+ fclose(fp);
+
+ return result;
}
-int read_server_config()
-{
- char *fname;
- int x;
-cp
- asprintf(&fname, "%s/tinc.conf", confbase);
- x = read_config_file(&config, fname);
- free(fname);
-cp
- return x;
+bool write_config_file(const struct splay_tree_t *config_tree, const char *fname) {
+ FILE *fp;
+
+ fp = fopen(fname, "w+");
+
+ if(!fp) {
+ logger(NULL, MESHLINK_ERROR, "Cannot open config file %s: %s", fname, strerror(errno));
+ return false;
+ }
+
+ for splay_each(config_t, cnf, config_tree) {
+ if(fwrite(cnf->variable, sizeof(char), strlen(cnf->variable), fp) < strlen(cnf->variable)) {
+ goto error;
+ }
+
+ if(fwrite(" = ", sizeof(char), 3, fp) < 3) {
+ goto error;
+ }
+
+ if(fwrite(cnf->value, sizeof(char), strlen(cnf->value), fp) < strlen(cnf->value)) {
+ goto error;
+ }
+
+ if(fwrite("\n", sizeof(char), 1, fp) < 1) {
+ goto error;
+ }
+ }
+
+ fclose(fp);
+ return true;
+
+error:
+ logger(NULL, MESHLINK_ERROR, "Cannot write to config file %s: %s", fname, strerror(errno));
+ fclose(fp);
+ return false;
}
-/*
- Look up the value of the config option type
-*/
-const config_t *get_config_val(config_t *p, which_t type)
-{
-cp
- for(p = config; p != NULL; p = p->next)
- if(p->which == type)
- break;
-cp
- return p;
+bool read_server_config(meshlink_handle_t *mesh) {
+ char filename[PATH_MAX];
+ bool x;
+
+ snprintf(filename, PATH_MAX, "%s" SLASH "meshlink.conf", mesh->confbase);
+ errno = 0;
+ x = read_config_file(mesh->config, filename);
+
+ if(!x && errno) {
+ logger(mesh, MESHLINK_ERROR, "Failed to read `%s': %s", filename, strerror(errno));
+ }
+
+ return x;
}
-/*
- Support for multiple config lines.
- Index is used to get a specific value, 0 being the first, 1 the second etc.
-*/
-const config_t *get_next_config_val(config_t *p, which_t type, int index)
-{
-cp
- for(p = config; p != NULL; p = p->next)
- if(p->which == type)
- if(--index < 0)
- break;
-cp
- return p;
+bool read_host_config(meshlink_handle_t *mesh, splay_tree_t *config_tree, const char *name) {
+ char filename[PATH_MAX];
+ bool x;
+
+ snprintf(filename, PATH_MAX, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
+ x = read_config_file(config_tree, filename);
+
+ return x;
}
-/*
- Remove the complete configuration tree.
-*/
-void clear_config(config_t **base)
-{
- config_t *p, *next;
-cp
- for(p = *base; p != NULL; p = next)
- {
- next = p->next;
- if(p->data.ptr && (p->argtype == TYPE_NAME))
- {
- free(p->data.ptr);
- }
- free(p);
- }
- *base = NULL;
-cp
+bool write_host_config(struct meshlink_handle *mesh, const struct splay_tree_t *config_tree, const char *name) {
+ char filename[PATH_MAX];
+
+ snprintf(filename, PATH_MAX, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
+ return write_config_file(config_tree, filename);
+}
+
+bool modify_config_file(struct meshlink_handle *mesh, const char *name, const char *key, const char *value, int trim) {
+ assert(mesh && name && key);
+
+ char filename[PATH_MAX];
+ char tmpname[PATH_MAX];
+ bool error = false;
+
+ if(snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name) >= PATH_MAX) {
+ logger(mesh, MESHLINK_ERROR, "Filename too long: %s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
+ return false;
+ }
+
+ if(snprintf(tmpname, sizeof(tmpname), "%s.tmp", filename) >= PATH_MAX) {
+ logger(mesh, MESHLINK_ERROR, "Filename too long: %s.tmp", filename);
+ return false;
+ }
+
+ FILE *fr = fopen(filename, "r");
+
+ if(!fr) {
+ logger(mesh, MESHLINK_ERROR, "Cannot open config file %s: %s", filename, strerror(errno));
+ return false;
+ }
+
+ FILE *fw = fopen(tmpname, "w");
+
+ if(!fw) {
+ logger(mesh, MESHLINK_ERROR, "Cannot open temporary file %s: %s", tmpname, strerror(errno));
+ fclose(fr);
+ return false;
+ }
+
+ char buf[4096];
+ char *sep;
+ int found = 0;
+
+ if(value) {
+ fprintf(fw, "%s = %s\n", key, value);
+ found++;
+ }
+
+ while(readline(fr, buf, sizeof(buf))) {
+ if(!*buf || *buf == '#') {
+ goto copy;
+ }
+
+ sep = strchr(buf, ' ');
+
+ if(!sep) {
+ goto copy;
+ }
+
+ *sep = 0;
+
+ if(strcmp(buf, key)) {
+ *sep = ' ';
+ goto copy;
+ }
+
+ // We found the key and the value. We already added it at the top, so ignore this one.
+ if(value && sep[1] == '=' && sep[2] == ' ' && !strcmp(sep + 3, value)) {
+ continue;
+ }
+
+ // We found the key but with a different value, delete it if wanted.
+ found++;
+
+ if((!value || trim) && found > trim) {
+ continue;
+ }
+
+ *sep = ' ';
+
+copy:
+ fprintf(fw, "%s\n", buf);
+ }
+
+ if(ferror(fr)) {
+ error = true;
+ }
+
+ fclose(fr);
+
+ if(ferror(fw)) {
+ error = true;
+ }
+
+ if(fclose(fw)) {
+ error = true;
+ }
+
+ // If any error occurred during reading or writing, exit.
+ if(error) {
+ unlink(tmpname);
+ return false;
+ }
+
+ // Try to atomically replace the old config file with the new one.
+#ifdef HAVE_MINGW
+ char bakname[PATH_MAX];
+ snprintf(bakname, sizeof(bakname), "%s.bak", filename);
+
+ if(rename(filename, bakname) || rename(tmpname, filename)) {
+ rename(bakname, filename);
+#else
+
+ if(rename(tmpname, filename)) {
+#endif
+ return false;
+ } else {
+#ifdef HAVE_MINGW
+ unlink(bakname);
+#endif
+ return true;
+ }
+}
+
+bool append_config_file(meshlink_handle_t *mesh, const char *name, const char *key, const char *value) {
+ return modify_config_file(mesh, name, key, value, 0);
}
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