2 script.c -- call an external script
3 Copyright (C) 1999-2005 Ivo Timmermans,
4 2000-2022 Guus Sliepen <guus@tinc-vpn.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License along
17 with this program; if not, write to the Free Software Foundation, Inc.,
18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
31 static void unputenv(const char *p) {
32 const char *e = strchr(p, '=');
38 ptrdiff_t len = e - p;
41 // Windows requires putenv("FOO=") to unset %FOO%
51 // We must keep what we putenv() around in memory.
52 // To do this without memory leaks, keep things in a list and reuse if possible.
53 static list_t list = {0};
55 for list_each(char, data, &list) {
56 if(!strcmp(data, var)) {
62 char *data = xstrdup(var);
63 list_insert_tail(&list, data);
68 static void putenv(const char *p) {}
69 static void unputenv(const char *p) {}
72 static const int min_env_size = 10;
74 int environment_add(environment_t *env, const char *format, ...) {
75 if(env->n >= env->size) {
76 env->size = env->n ? env->n * 2 : min_env_size;
77 env->entries = xrealloc(env->entries, env->size * sizeof(*env->entries));
84 if(vasprintf(&env->entries[env->n], format, ap) == -1) {
85 // Assume we are out of memory.
91 env->entries[env->n] = NULL;
97 void environment_update(environment_t *env, int pos, const char *format, ...) {
98 free(env->entries[pos]);
100 va_start(ap, format);
102 if(vasprintf(&env->entries[pos], format, ap) == -1) {
109 void environment_init(environment_t *env) {
111 env->size = min_env_size;
112 env->entries = xzalloc(env->size * sizeof(*env->entries));
115 environment_add(env, "NETNAME=%s", netname);
119 environment_add(env, "NAME=%s", myname);
123 environment_add(env, "DEVICE=%s", device);
127 environment_add(env, "INTERFACE=%s", iface);
130 if(debug_level >= 0) {
131 environment_add(env, "DEBUG=%d", debug_level);
135 void environment_exit(environment_t *env) {
136 for(int i = 0; i < env->n; i++) {
137 free(env->entries[i]);
143 bool execute_script(const char *name, environment_t *env) {
144 char scriptname[PATH_MAX];
147 snprintf(scriptname, sizeof(scriptname), "%s" SLASH "%s%s", confbase, name, scriptextension);
149 /* First check if there is a script */
153 if(!*scriptextension) {
154 const char *pathext = getenv("PATHEXT");
157 pathext = ".COM;.EXE;.BAT;.CMD";
160 size_t pathlen = strlen(pathext);
161 size_t scriptlen = strlen(scriptname);
162 char fullname[scriptlen + pathlen + 1];
163 char *ext = fullname + scriptlen;
164 strncpy(fullname, scriptname, sizeof(fullname));
166 const char *p = pathext;
170 const char *q = strchr(p, ';');
173 memcpy(ext, p, q - p);
177 strncpy(ext, p, pathlen + 1);
180 if((found = !access(fullname, F_OK))) {
193 if(access(scriptname, F_OK)) {
197 logger(DEBUG_STATUS, LOG_INFO, "Executing script %s", name);
199 /* Set environment */
201 for(int i = 0; i < env->n; i++) {
202 putenv(env->entries[i]);
205 if(scriptinterpreter) {
206 xasprintf(&command, "%s \"%s\"", scriptinterpreter, scriptname);
208 xasprintf(&command, "\"%s\"", scriptname);
211 int status = system(command);
215 /* Unset environment */
217 for(int i = 0; i < env->n; i++) {
218 unputenv(env->entries[i]);
224 if(WIFEXITED(status)) { /* Child exited by itself */
225 if(WEXITSTATUS(status)) {
226 logger(DEBUG_ALWAYS, LOG_ERR, "Script %s exited with non-zero status %d",
227 name, WEXITSTATUS(status));
230 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
231 logger(DEBUG_ALWAYS, LOG_ERR, "Script %s was killed by signal %d (%s)",
232 name, WTERMSIG(status), strsignal(WTERMSIG(status)));
234 } else { /* Something strange happened */
235 logger(DEBUG_ALWAYS, LOG_ERR, "Script %s terminated abnormally", name);
241 logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "system", strerror(errno));