conf.c -- configuration code
Copyright (C) 1998 Robert van der Meulen
1998-2005 Ivo Timmermans
- 2000-2009 Guus Sliepen <guus@tinc-vpn.org>
- 2000 Cris van Pelt
+ 2000-2014 Guus Sliepen <guus@tinc-vpn.org>
+ 2010-2011 Julien Muchembled <jm@jmuchemb.eu>
+ 2000 Cris van Pelt
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
#include "system.h"
#include "avl_tree.h"
+#include "connection.h"
#include "conf.h"
+#include "list.h"
#include "logger.h"
-#include "netutl.h" /* for str2address */
+#include "netutl.h" /* for str2address */
#include "protocol.h"
-#include "utils.h" /* for cp */
+#include "utils.h" /* for cp */
#include "xalloc.h"
avl_tree_t *config_tree;
-int pinginterval = 0; /* seconds between pings */
-int pingtimeout = 0; /* seconds to wait for response */
-char *confbase = NULL; /* directory in which all config files are */
-char *netname = NULL; /* name of the vpn network */
-list_t *cmdline_conf = NULL; /* global/host configuration values given at the command line */
+int pinginterval = 0; /* seconds between pings */
+int pingtimeout = 0; /* seconds to wait for response */
+char *confbase = NULL; /* directory in which all config files are */
+char *netname = NULL; /* name of the vpn network */
+list_t *cmdline_conf = NULL; /* global/host configuration values given at the command line */
static int config_compare(const config_t *a, const config_t *b) {
result = strcasecmp(a->variable, b->variable);
- if(result)
+ if(result) {
return result;
+ }
/* give priority to command line options */
result = !b->file - !a->file;
- if (result)
+
+ if(result) {
return result;
+ }
result = a->line - b->line;
- if(result)
+ if(result) {
return result;
- else
+ } else {
return a->file ? strcmp(a->file, b->file) : 0;
+ }
}
-void init_configuration(avl_tree_t ** config_tree) {
+void init_configuration(avl_tree_t **config_tree) {
*config_tree = avl_alloc_tree((avl_compare_t) config_compare, (avl_action_t) free_config);
}
-void exit_configuration(avl_tree_t ** config_tree) {
+void exit_configuration(avl_tree_t **config_tree) {
avl_delete_tree(*config_tree);
*config_tree = NULL;
}
}
void free_config(config_t *cfg) {
- if(cfg->variable)
+ if(cfg->variable) {
free(cfg->variable);
+ }
- if(cfg->value)
+ if(cfg->value) {
free(cfg->value);
+ }
- if(cfg->file)
+ if(cfg->file) {
free(cfg->file);
+ }
free(cfg);
}
avl_insert(config_tree, cfg);
}
-config_t *lookup_config(avl_tree_t *config_tree, char *variable) {
+config_t *lookup_config(const avl_tree_t *config_tree, char *variable) {
config_t cfg, *found;
cfg.variable = variable;
found = avl_search_closest_greater(config_tree, &cfg);
- if(!found)
+ if(!found) {
return NULL;
+ }
- if(strcasecmp(found->variable, variable))
+ if(strcasecmp(found->variable, variable)) {
return NULL;
+ }
return found;
}
-config_t *lookup_config_next(avl_tree_t *config_tree, const config_t *cfg) {
+config_t *lookup_config_next(const avl_tree_t *config_tree, const config_t *cfg) {
avl_node_t *node;
config_t *found;
if(node->next) {
found = node->next->data;
- if(!strcasecmp(found->variable, cfg->variable))
+ if(!strcasecmp(found->variable, cfg->variable)) {
return found;
+ }
}
}
}
bool get_config_bool(const config_t *cfg, bool *result) {
- if(!cfg)
+ if(!cfg) {
return false;
+ }
if(!strcasecmp(cfg->value, "yes")) {
*result = true;
}
logger(LOG_ERR, "\"yes\" or \"no\" expected for configuration variable %s in %s line %d",
- cfg->variable, cfg->file, cfg->line);
+ cfg->variable, cfg->file, cfg->line);
return false;
}
bool get_config_int(const config_t *cfg, int *result) {
- if(!cfg)
+ if(!cfg) {
return false;
+ }
- if(sscanf(cfg->value, "%d", result) == 1)
+ if(sscanf(cfg->value, "%d", result) == 1) {
return true;
+ }
logger(LOG_ERR, "Integer expected for configuration variable %s in %s line %d",
- cfg->variable, cfg->file, cfg->line);
+ cfg->variable, cfg->file, cfg->line);
return false;
}
bool get_config_string(const config_t *cfg, char **result) {
- if(!cfg)
+ if(!cfg) {
return false;
+ }
*result = xstrdup(cfg->value);
bool get_config_address(const config_t *cfg, struct addrinfo **result) {
struct addrinfo *ai;
- if(!cfg)
+ if(!cfg) {
return false;
+ }
ai = str2addrinfo(cfg->value, NULL, 0);
}
logger(LOG_ERR, "Hostname or IP address expected for configuration variable %s in %s line %d",
- cfg->variable, cfg->file, cfg->line);
+ cfg->variable, cfg->file, cfg->line);
return false;
}
-bool get_config_subnet(const config_t *cfg, subnet_t ** result) {
- subnet_t subnet = {0};
+bool get_config_subnet(const config_t *cfg, subnet_t **result) {
+ subnet_t subnet = {};
- if(!cfg)
+ if(!cfg) {
return false;
+ }
if(!str2net(&subnet, cfg->value)) {
logger(LOG_ERR, "Subnet expected for configuration variable %s in %s line %d",
- cfg->variable, cfg->file, cfg->line);
+ cfg->variable, cfg->file, cfg->line);
return false;
}
/* Teach newbies what subnets are... */
if(((subnet.type == SUBNET_IPV4)
- && !maskcheck(&subnet.net.ipv4.address, subnet.net.ipv4.prefixlength, sizeof(ipv4_t)))
- || ((subnet.type == SUBNET_IPV6)
- && !maskcheck(&subnet.net.ipv6.address, subnet.net.ipv6.prefixlength, sizeof(ipv6_t)))) {
+ && !maskcheck(&subnet.net.ipv4.address, subnet.net.ipv4.prefixlength, sizeof(ipv4_t)))
+ || ((subnet.type == SUBNET_IPV6)
+ && !maskcheck(&subnet.net.ipv6.address, subnet.net.ipv6.prefixlength, sizeof(ipv6_t)))) {
logger(LOG_ERR, "Network address and prefix length do not match for configuration variable %s in %s line %d",
- cfg->variable, cfg->file, cfg->line);
+ cfg->variable, cfg->file, cfg->line);
return false;
}
/*
Read exactly one line and strip the trailing newline if any.
*/
-static char *readline(FILE * fp, char *buf, size_t buflen) {
+static char *readline(FILE *fp, char *buf, size_t buflen) {
char *newline = NULL;
char *p;
- if(feof(fp))
+ if(feof(fp)) {
return NULL;
+ }
p = fgets(buf, buflen, fp);
- if(!p)
+ if(!p) {
return NULL;
+ }
newline = strchr(p, '\n');
- if(!newline)
+ if(!newline) {
return buf;
+ }
- *newline = '\0'; /* kill newline */
- if(newline > p && newline[-1] == '\r') /* and carriage return if necessary */
+ *newline = '\0'; /* kill newline */
+
+ if(newline > p && newline[-1] == '\r') { /* and carriage return if necessary */
newline[-1] = '\0';
+ }
return buf;
}
variable = value = line;
eol = line + strlen(line);
- while(strchr("\t ", *--eol))
+
+ 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";
- if (fname)
+
+ if(fname)
logger(LOG_ERR, "%s `%s' on line %d while reading config file %s",
- err, variable, lineno, fname);
+ err, variable, lineno, fname);
else
logger(LOG_ERR, "%s `%s' in command line option %d",
- err, variable, lineno);
+ err, variable, lineno);
+
return NULL;
}
}
for(;;) {
- line = readline(fp, buffer, sizeof buffer);
+ line = readline(fp, buffer, sizeof(buffer));
if(!line) {
- if(feof(fp))
+ if(feof(fp)) {
result = true;
+ }
+
break;
}
lineno++;
- if(!*line || *line == '#')
+ if(!*line || *line == '#') {
continue;
+ }
if(ignore) {
- if(!strncmp(line, "-----END", 8))
+ 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)
+
+ if(!cfg) {
break;
+ }
+
config_add(config_tree, cfg);
}
return result;
}
-bool read_server_config() {
- list_node_t *node, *next;
- char *fname;
- bool x;
+void read_config_options(avl_tree_t *config_tree, const char *prefix) {
+ size_t prefix_len = prefix ? strlen(prefix) : 0;
+
+ for(const list_node_t *node = cmdline_conf->tail; node; node = node->prev) {
+ const config_t *cfg = node->data;
+
+ if(!prefix) {
+ if(strchr(cfg->variable, '.')) {
+ continue;
+ }
+ } else {
+ if(strncmp(prefix, cfg->variable, prefix_len) ||
+ cfg->variable[prefix_len] != '.') {
+ continue;
+ }
+ }
+
+ config_t *new = new_config();
- for(node = cmdline_conf->tail; node; node = next) {
- config_t *cfg = (config_t *)node->data;
- next = node->prev;
- if (!strchr(cfg->variable, '.')) {
- config_add(config_tree, cfg);
- node->data = NULL;
- list_unlink_node(cmdline_conf, node);
+ if(prefix) {
+ new->variable = xstrdup(cfg->variable + prefix_len + 1);
+ } else {
+ new->variable = xstrdup(cfg->variable);
}
+
+ new->value = xstrdup(cfg->value);
+ new->file = NULL;
+ new->line = cfg->line;
+
+ config_add(config_tree, new);
}
+}
- xasprintf(&fname, "%s/tinc.conf", confbase);
+bool read_server_config(void) {
+ char fname[PATH_MAX];
+ bool x;
+
+ read_config_options(config_tree, NULL);
+
+ snprintf(fname, sizeof(fname), "%s/tinc.conf", confbase);
+ errno = 0;
x = read_config_file(config_tree, fname);
- if(!x) { /* System error: complain */
+ // We will try to read the conf files in the "conf.d" dir
+ if(x) {
+ char dname[PATH_MAX];
+ snprintf(dname, sizeof(dname), "%s/conf.d", confbase);
+ DIR *dir = opendir(dname);
+
+ // If we can find this dir
+ if(dir) {
+ struct dirent *ep;
+
+ // We list all the files in it
+ while(x && (ep = readdir(dir))) {
+ size_t l = strlen(ep->d_name);
+
+ // And we try to read the ones that end with ".conf"
+ if(l > 5 && !strcmp(".conf", & ep->d_name[ l - 5 ])) {
+ snprintf(fname, sizeof(fname), "%s/%s", dname, ep->d_name);
+ x = read_config_file(config_tree, fname);
+ }
+ }
+
+ closedir(dir);
+ }
+ }
+
+ if(!x && errno) {
logger(LOG_ERR, "Failed to read `%s': %s", fname, strerror(errno));
}
- free(fname);
+ return x;
+}
+
+bool read_connection_config(connection_t *c) {
+ char fname[PATH_MAX];
+ bool x;
+
+ read_config_options(c->config_tree, c->name);
+
+ snprintf(fname, sizeof(fname), "%s/hosts/%s", confbase, c->name);
+ x = read_config_file(c->config_tree, fname);
return x;
}
+static void disable_old_keys(const char *filename) {
+ char tmpfile[PATH_MAX] = "";
+ char buf[1024];
+ bool disabled = false;
+ FILE *r, *w;
+
+ r = fopen(filename, "r");
+
+ if(!r) {
+ return;
+ }
+
+ snprintf(tmpfile, sizeof(tmpfile), "%s.tmp", filename);
+
+ w = fopen(tmpfile, "w");
+
+ while(fgets(buf, sizeof(buf), r)) {
+ if(!strncmp(buf, "-----BEGIN RSA", 14)) {
+ buf[11] = 'O';
+ buf[12] = 'L';
+ buf[13] = 'D';
+ disabled = true;
+ } else if(!strncmp(buf, "-----END RSA", 12)) {
+ buf[ 9] = 'O';
+ buf[10] = 'L';
+ buf[11] = 'D';
+ disabled = true;
+ }
+
+ if(w && fputs(buf, w) < 0) {
+ disabled = false;
+ break;
+ }
+ }
+
+ if(w) {
+ fclose(w);
+ }
+
+ fclose(r);
+
+ if(!w && disabled) {
+ fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
+ return;
+ }
+
+ if(disabled) {
+#ifdef HAVE_MINGW
+ // We cannot atomically replace files on Windows.
+ char bakfile[PATH_MAX] = "";
+ snprintf(bakfile, sizeof(bakfile), "%s.bak", filename);
+
+ if(rename(filename, bakfile) || rename(tmpfile, filename)) {
+ rename(bakfile, filename);
+#else
+
+ if(rename(tmpfile, filename)) {
+#endif
+ fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
+ } else {
+#ifdef HAVE_MINGW
+ unlink(bakfile);
+#endif
+ fprintf(stderr, "Warning: old key(s) found and disabled.\n");
+ }
+ }
+
+ unlink(tmpfile);
+}
+
FILE *ask_and_open(const char *filename, const char *what) {
FILE *r;
- char *directory;
+ char directory[PATH_MAX];
char line[PATH_MAX];
+ char abspath[PATH_MAX];
const char *fn;
/* Check stdin and stdout */
} else {
/* Ask for a file and/or directory name. */
fprintf(stdout, "Please enter a file to save %s to [%s]: ",
- what, filename);
+ what, filename);
fflush(stdout);
- fn = readline(stdin, line, sizeof line);
+ fn = readline(stdin, line, sizeof(line));
if(!fn) {
fprintf(stderr, "Error while reading stdin: %s\n",
- strerror(errno));
+ strerror(errno));
return NULL;
}
if(!strlen(fn))
/* User just pressed enter. */
+ {
fn = filename;
+ }
}
#ifdef HAVE_MINGW
+
if(fn[0] != '\\' && fn[0] != '/' && !strchr(fn, ':')) {
#else
+
if(fn[0] != '/') {
#endif
/* The directory is a relative path or a filename. */
- char *p;
-
- directory = get_current_dir_name();
- xasprintf(&p, "%s/%s", directory, fn);
- free(directory);
- fn = p;
+ getcwd(directory, sizeof(directory));
+ snprintf(abspath, sizeof(abspath), "%s/%s", directory, fn);
+ fn = abspath;
}
- umask(0077); /* Disallow everything for group and other */
+ umask(0077); /* Disallow everything for group and other */
+
+ disable_old_keys(fn);
/* Open it first to keep the inode busy */
- r = fopen(fn, "r+") ?: fopen(fn, "w+");
+ r = fopen(fn, "a");
if(!r) {
fprintf(stderr, "Error opening file `%s': %s\n",
- fn, strerror(errno));
+ fn, strerror(errno));
return NULL;
}
return r;
}
-bool disable_old_keys(FILE *f) {
- char buf[100];
- long pos;
- bool disabled = false;
-
- rewind(f);
- pos = ftell(f);
-
- while(fgets(buf, sizeof buf, f)) {
- if(!strncmp(buf, "-----BEGIN RSA", 14)) {
- buf[11] = 'O';
- buf[12] = 'L';
- buf[13] = 'D';
- fseek(f, pos, SEEK_SET);
- fputs(buf, f);
- disabled = true;
- }
- else if(!strncmp(buf, "-----END RSA", 12)) {
- buf[ 9] = 'O';
- buf[10] = 'L';
- buf[11] = 'D';
- fseek(f, pos, SEEK_SET);
- fputs(buf, f);
- disabled = true;
- }
- pos = ftell(f);
- }
- return disabled;
-}
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