+static const int min_env_size;
+
+int environment_add(environment_t *env, const char *format, ...) {
+ if(env->n >= env->size) {
+ env->size = env->n ? env->n * 2 : min_env_size;
+ env->entries = xrealloc(env->entries, env->size * sizeof *env->entries);
+ }
+
+ if(format) {
+ va_list ap;
+ va_start(ap, format);
+ vasprintf(&env->entries[env->n], format, ap);
+ va_end(ap);
+ } else {
+ env->entries[env->n] = NULL;
+ }
+
+ return env->n++;
+}
+
+void environment_update(environment_t *env, int pos, const char *format, ...) {
+ free(env->entries[pos]);
+ va_list ap;
+ va_start(ap, format);
+ vasprintf(&env->entries[pos], format, ap);
+ va_end(ap);
+}
+
+void environment_init(environment_t *env) {
+ env->n = 0;
+ env->size = min_env_size;
+ env->entries = 0; //xzalloc(env->size * sizeof *env->entries);
+
+ if(netname)
+ environment_add(env, "NETNAME=%s", netname);
+ if(myname)
+ environment_add(env, "NAME=%s", myname);
+ if(device)
+ environment_add(env, "DEVICE=%s", device);
+ if(iface)
+ environment_add(env, "INTERFACE=%s", iface);
+}
+
+void environment_exit(environment_t *env) {
+ for(int i = 0; i < env->n; i++)
+ free(env->entries[i]);
+ free(env->entries);
+}
+
+bool execute_script(const char *name, environment_t *env) {