2003-12-24 06:02:11 +00:00
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/*
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* Sysctl 1.01 - A utility to read and manipulate the sysctl parameters
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*
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2006-04-17 21:49:34 +00:00
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* Copyright 1999 George Staikos
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2006-04-12 07:35:12 +00:00
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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2003-12-24 06:02:11 +00:00
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*
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* Changelog:
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* v1.01:
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* - added -p <preload> to preload values from a file
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* v1.01.1
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* - busybox applet aware by <solar@gentoo.org>
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2004-03-15 08:29:22 +00:00
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*
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2003-12-24 06:02:11 +00:00
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*/
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2007-05-26 19:00:18 +00:00
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#include "libbb.h"
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2003-12-24 06:02:11 +00:00
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2007-11-29 06:40:28 +00:00
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static int sysctl_read_setting(const char *setting);
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static int sysctl_write_setting(const char *setting);
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static int sysctl_display_all(const char *path);
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static int sysctl_preload_file_and_exit(const char *filename);
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2008-10-15 08:22:55 +00:00
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static void sysctl_dots_to_slashes(char *name);
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2003-12-24 06:02:11 +00:00
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2007-10-29 19:22:13 +00:00
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static const char ETC_SYSCTL_CONF[] ALIGN1 = "/etc/sysctl.conf";
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static const char PROC_SYS[] ALIGN1 = "/proc/sys/";
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enum { strlen_PROC_SYS = sizeof(PROC_SYS) - 1 };
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2003-12-24 06:02:11 +00:00
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2008-10-15 08:29:17 +00:00
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static const char msg_unknown_key[] ALIGN1 =
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2007-10-29 19:22:13 +00:00
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"error: '%s' is an unknown key";
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2003-12-24 06:02:11 +00:00
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2003-12-26 02:19:34 +00:00
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static void dwrite_str(int fd, const char *buf)
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{
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write(fd, buf, strlen(buf));
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}
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2007-11-29 06:40:28 +00:00
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enum {
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FLAG_SHOW_KEYS = 1 << 0,
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FLAG_SHOW_KEY_ERRORS = 1 << 1,
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FLAG_TABLE_FORMAT = 1 << 2, /* not implemented */
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FLAG_SHOW_ALL = 1 << 3,
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FLAG_PRELOAD_FILE = 1 << 4,
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FLAG_WRITE = 1 << 5,
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};
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2007-10-11 10:05:36 +00:00
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int sysctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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2008-07-05 09:18:54 +00:00
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int sysctl_main(int argc UNUSED_PARAM, char **argv)
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2003-12-24 06:02:11 +00:00
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{
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2007-11-29 06:40:28 +00:00
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int retval;
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int opt;
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opt = getopt32(argv, "+neAapw"); /* '+' - stop on first non-option */
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argv += optind;
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opt ^= (FLAG_SHOW_KEYS | FLAG_SHOW_KEY_ERRORS);
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option_mask32 ^= (FLAG_SHOW_KEYS | FLAG_SHOW_KEY_ERRORS);
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if (opt & (FLAG_TABLE_FORMAT | FLAG_SHOW_ALL))
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return sysctl_display_all(PROC_SYS);
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if (opt & FLAG_PRELOAD_FILE)
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return sysctl_preload_file_and_exit(*argv ? *argv : ETC_SYSCTL_CONF);
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retval = 0;
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while (*argv) {
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if (opt & FLAG_WRITE)
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retval |= sysctl_write_setting(*argv);
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else
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retval |= sysctl_read_setting(*argv);
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argv++;
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2003-12-24 06:02:11 +00:00
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}
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2007-11-29 06:40:28 +00:00
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2003-12-24 06:02:11 +00:00
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return retval;
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2007-10-29 19:22:13 +00:00
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} /* end sysctl_main() */
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2003-12-24 06:02:11 +00:00
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2008-10-15 08:45:54 +00:00
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/* Set sysctl's from a conf file. Format example:
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* # Controls IP packet forwarding
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* net.ipv4.ip_forward = 0
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2003-12-24 06:02:11 +00:00
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*/
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2007-11-29 06:40:28 +00:00
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static int sysctl_preload_file_and_exit(const char *filename)
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2003-12-24 06:02:11 +00:00
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{
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2008-07-20 13:01:56 +00:00
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char *token[2];
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parser_t *parser;
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parser = config_open(filename);
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2008-10-15 08:45:54 +00:00
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// TODO: ';' is comment char too
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while (config_read(parser, token, 2, 2, "# \t=", PARSE_NORMAL)) {
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2008-07-20 13:01:56 +00:00
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#if 0
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2008-10-15 08:45:54 +00:00
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char *s = xasprintf("%s=%s", token[0], token[1]);
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sysctl_write_setting(s);
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free(s);
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#else /* Save ~4 bytes by using parser internals */
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sprintf(parser->line, "%s=%s", token[0], token[1]); // must have room by definition
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sysctl_write_setting(parser->line);
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2008-07-20 13:01:56 +00:00
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#endif
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2003-12-24 06:02:11 +00:00
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}
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2007-11-29 06:40:28 +00:00
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if (ENABLE_FEATURE_CLEAN_UP)
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2008-07-20 13:01:56 +00:00
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config_close(parser);
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2003-12-24 06:02:11 +00:00
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return 0;
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2007-11-29 06:40:28 +00:00
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} /* end sysctl_preload_file_and_exit() */
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2003-12-24 06:02:11 +00:00
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2007-11-29 06:40:28 +00:00
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static int sysctl_write_setting(const char *setting)
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2003-12-24 06:02:11 +00:00
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{
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2007-11-29 06:40:28 +00:00
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int retval;
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2007-10-29 19:22:13 +00:00
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const char *name;
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2003-12-24 06:02:11 +00:00
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const char *value;
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const char *equals;
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char *tmpname, *outname, *cptr;
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2007-11-29 06:40:28 +00:00
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int fd;
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2003-12-24 06:02:11 +00:00
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2007-10-29 19:22:13 +00:00
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name = setting;
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equals = strchr(setting, '=');
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if (!equals) {
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2008-10-15 08:29:17 +00:00
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bb_error_msg("error: '%s' must be of the form name=value", setting);
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2007-11-29 06:40:28 +00:00
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return EXIT_FAILURE;
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2003-12-24 06:02:11 +00:00
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}
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2007-10-29 19:22:13 +00:00
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value = equals + 1; /* point to the value in name=value */
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if (name == equals || !*value) {
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2008-10-15 08:29:17 +00:00
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bb_error_msg("error: malformed setting '%s'", setting);
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2007-11-29 06:40:28 +00:00
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return EXIT_FAILURE;
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2003-12-24 06:02:11 +00:00
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}
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2007-10-29 19:22:13 +00:00
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tmpname = xasprintf("%s%.*s", PROC_SYS, (int)(equals - name), name);
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outname = xstrdup(tmpname + strlen_PROC_SYS);
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2003-12-24 06:02:11 +00:00
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2008-10-15 08:22:55 +00:00
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sysctl_dots_to_slashes(tmpname);
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2003-12-24 06:02:11 +00:00
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while ((cptr = strchr(outname, '/')) != NULL)
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*cptr = '.';
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2007-04-11 23:20:53 +00:00
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fd = open(tmpname, O_WRONLY | O_CREAT | O_TRUNC, 0666);
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if (fd < 0) {
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2003-12-24 06:02:11 +00:00
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switch (errno) {
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case ENOENT:
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2007-11-29 06:40:28 +00:00
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if (option_mask32 & FLAG_SHOW_KEY_ERRORS)
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2008-10-15 08:29:17 +00:00
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bb_error_msg(msg_unknown_key, outname);
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2003-12-24 06:02:11 +00:00
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break;
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default:
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2008-10-15 08:29:17 +00:00
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bb_perror_msg("error setting key '%s'", outname);
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2003-12-24 06:02:11 +00:00
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break;
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}
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2007-11-29 06:40:28 +00:00
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retval = EXIT_FAILURE;
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2003-12-24 06:02:11 +00:00
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} else {
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2003-12-26 02:19:34 +00:00
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dwrite_str(fd, value);
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2003-12-24 06:02:11 +00:00
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close(fd);
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2007-11-29 06:40:28 +00:00
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if (option_mask32 & FLAG_SHOW_KEYS) {
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printf("%s = ", outname);
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2003-12-24 06:02:11 +00:00
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}
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2007-11-29 06:40:28 +00:00
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puts(value);
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retval = EXIT_SUCCESS;
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2003-12-24 06:02:11 +00:00
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}
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free(tmpname);
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free(outname);
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return retval;
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2007-10-29 19:22:13 +00:00
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} /* end sysctl_write_setting() */
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2003-12-24 06:02:11 +00:00
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2007-11-29 06:40:28 +00:00
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static int sysctl_read_setting(const char *name)
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2003-12-24 06:02:11 +00:00
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{
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2007-11-29 06:40:28 +00:00
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int retval;
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2003-12-24 06:02:11 +00:00
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char *tmpname, *outname, *cptr;
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char inbuf[1025];
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FILE *fp;
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2007-11-29 06:40:28 +00:00
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if (!*name) {
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if (option_mask32 & FLAG_SHOW_KEY_ERRORS)
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2008-10-15 08:29:17 +00:00
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bb_error_msg(msg_unknown_key, name);
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2007-11-29 06:40:28 +00:00
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return -1;
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}
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2003-12-24 06:02:11 +00:00
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2007-10-29 19:22:13 +00:00
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tmpname = concat_path_file(PROC_SYS, name);
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outname = xstrdup(tmpname + strlen_PROC_SYS);
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2003-12-24 06:02:11 +00:00
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2008-10-15 08:22:55 +00:00
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sysctl_dots_to_slashes(tmpname);
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2003-12-24 06:02:11 +00:00
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while ((cptr = strchr(outname, '/')) != NULL)
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*cptr = '.';
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2008-07-21 23:05:26 +00:00
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fp = fopen_for_read(tmpname);
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2007-10-29 19:22:13 +00:00
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if (fp == NULL) {
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2003-12-24 06:02:11 +00:00
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switch (errno) {
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case ENOENT:
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2007-11-29 06:40:28 +00:00
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if (option_mask32 & FLAG_SHOW_KEY_ERRORS)
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2008-10-15 08:29:17 +00:00
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bb_error_msg(msg_unknown_key, outname);
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2003-12-24 06:02:11 +00:00
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break;
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default:
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2008-10-15 08:29:17 +00:00
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bb_perror_msg("error reading key '%s'", outname);
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2003-12-24 06:02:11 +00:00
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break;
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}
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2007-11-29 06:40:28 +00:00
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retval = EXIT_FAILURE;
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2003-12-24 06:02:11 +00:00
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} else {
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while (fgets(inbuf, sizeof(inbuf) - 1, fp)) {
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2007-11-29 06:40:28 +00:00
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if (option_mask32 & FLAG_SHOW_KEYS) {
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printf("%s = ", outname);
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2003-12-24 06:02:11 +00:00
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}
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2007-11-29 06:40:28 +00:00
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fputs(inbuf, stdout);
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2003-12-24 06:02:11 +00:00
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}
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fclose(fp);
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2007-11-29 06:40:28 +00:00
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retval = EXIT_SUCCESS;
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2003-12-24 06:02:11 +00:00
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}
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free(tmpname);
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free(outname);
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return retval;
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2007-10-29 19:22:13 +00:00
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} /* end sysctl_read_setting() */
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2003-12-24 06:02:11 +00:00
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2007-11-29 06:40:28 +00:00
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static int sysctl_display_all(const char *path)
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2003-12-24 06:02:11 +00:00
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{
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2008-10-15 08:45:54 +00:00
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int retval = EXIT_SUCCESS;
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2003-12-24 06:02:11 +00:00
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DIR *dp;
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struct dirent *de;
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char *tmpdir;
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struct stat ts;
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2007-04-12 00:32:05 +00:00
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dp = opendir(path);
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if (!dp) {
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2007-11-29 06:40:28 +00:00
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return EXIT_FAILURE;
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2003-12-24 06:02:11 +00:00
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}
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2007-10-29 19:22:13 +00:00
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while ((de = readdir(dp)) != NULL) {
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tmpdir = concat_subpath_file(path, de->d_name);
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if (tmpdir == NULL)
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2007-11-29 06:40:28 +00:00
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continue; /* . or .. */
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2007-10-29 19:22:13 +00:00
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if (stat(tmpdir, &ts) != 0) {
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bb_perror_msg(tmpdir);
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} else if (S_ISDIR(ts.st_mode)) {
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2007-11-29 06:40:28 +00:00
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retval |= sysctl_display_all(tmpdir);
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2007-10-29 19:22:13 +00:00
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} else {
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2007-11-29 06:40:28 +00:00
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retval |= sysctl_read_setting(tmpdir + strlen_PROC_SYS);
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2007-10-29 19:22:13 +00:00
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}
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free(tmpdir);
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} /* end while */
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closedir(dp);
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2003-12-24 06:02:11 +00:00
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return retval;
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2007-10-29 19:22:13 +00:00
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} /* end sysctl_display_all() */
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2008-10-15 08:22:55 +00:00
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static void sysctl_dots_to_slashes(char *name)
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{
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char *cptr = name;
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/* Example from bug 3894:
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* net.ipv4.conf.eth0.100.mc_forwarding ->
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* net/ipv4/conf/eth0.100/mc_forwarding */
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while (*cptr != '\0') {
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if (*cptr == '.') {
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*cptr = '\0';
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if (access(name, F_OK) == 0)
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*cptr = '/';
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else
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*cptr = '.';
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}
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cptr++;
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}
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} /* end sysctl_dots_to_slashes() */
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