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path: root/release/src/router/busybox/procps/sysctl.c
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Diffstat (limited to 'release/src/router/busybox/procps/sysctl.c')
-rw-r--r--release/src/router/busybox/procps/sysctl.c258
1 files changed, 258 insertions, 0 deletions
diff --git a/release/src/router/busybox/procps/sysctl.c b/release/src/router/busybox/procps/sysctl.c
new file mode 100644
index 00000000..c9063bf0
--- /dev/null
+++ b/release/src/router/busybox/procps/sysctl.c
@@ -0,0 +1,258 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Sysctl 1.01 - A utility to read and manipulate the sysctl parameters
+ *
+ * Copyright 1999 George Staikos
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ *
+ * Changelog:
+ * v1.01 - added -p <preload> to preload values from a file
+ * v1.01.1 - busybox applet aware by <solar@gentoo.org>
+ */
+
+#include "libbb.h"
+
+enum {
+ FLAG_SHOW_KEYS = 1 << 0,
+ FLAG_SHOW_KEY_ERRORS = 1 << 1,
+ FLAG_TABLE_FORMAT = 1 << 2, /* not implemented */
+ FLAG_SHOW_ALL = 1 << 3,
+ FLAG_PRELOAD_FILE = 1 << 4,
+ FLAG_WRITE = 1 << 5,
+};
+#define OPTION_STR "neAapw"
+
+static void sysctl_dots_to_slashes(char *name)
+{
+ char *cptr, *last_good, *end;
+
+ /* Convert minimum number of '.' to '/' so that
+ * we end up with existing file's name.
+ *
+ * Example from bug 3894:
+ * net.ipv4.conf.eth0.100.mc_forwarding ->
+ * net/ipv4/conf/eth0.100/mc_forwarding
+ * NB: net/ipv4/conf/eth0/mc_forwarding *also exists*,
+ * therefore we must start from the end, and if
+ * we replaced even one . -> /, start over again,
+ * but never replace dots before the position
+ * where last replacement occurred.
+ *
+ * Another bug we later had is that
+ * net.ipv4.conf.eth0.100
+ * (without .mc_forwarding) was mishandled.
+ *
+ * To set up testing: modprobe 8021q; vconfig add eth0 100
+ */
+ end = name + strlen(name);
+ last_good = name - 1;
+ *end = '.'; /* trick the loop into trying full name too */
+
+ again:
+ cptr = end;
+ while (cptr > last_good) {
+ if (*cptr == '.') {
+ *cptr = '\0';
+ //bb_error_msg("trying:'%s'", name);
+ if (access(name, F_OK) == 0) {
+ if (cptr != end) /* prevent trailing '/' */
+ *cptr = '/';
+ //bb_error_msg("replaced:'%s'", name);
+ last_good = cptr;
+ goto again;
+ }
+ *cptr = '.';
+ }
+ cptr--;
+ }
+ *end = '\0';
+}
+
+static int sysctl_act_on_setting(char *setting)
+{
+ int fd, retval = EXIT_SUCCESS;
+ char *cptr, *outname;
+ char *value = value; /* for compiler */
+
+ outname = xstrdup(setting);
+
+ cptr = outname;
+ while (*cptr) {
+ if (*cptr == '/')
+ *cptr = '.';
+ cptr++;
+ }
+
+ if (option_mask32 & FLAG_WRITE) {
+ cptr = strchr(setting, '=');
+ if (cptr == NULL) {
+ bb_error_msg("error: '%s' must be of the form name=value",
+ outname);
+ retval = EXIT_FAILURE;
+ goto end;
+ }
+ value = cptr + 1; /* point to the value in name=value */
+ if (setting == cptr || !*value) {
+ bb_error_msg("error: malformed setting '%s'", outname);
+ retval = EXIT_FAILURE;
+ goto end;
+ }
+ *cptr = '\0';
+ outname[cptr - setting] = '\0';
+ /* procps 3.2.7 actually uses these flags */
+ fd = open(setting, O_WRONLY|O_CREAT|O_TRUNC, 0666);
+ } else {
+ fd = open(setting, O_RDONLY);
+ }
+
+ if (fd < 0) {
+ switch (errno) {
+ case ENOENT:
+ if (option_mask32 & FLAG_SHOW_KEY_ERRORS)
+ bb_error_msg("error: '%s' is an unknown key", outname);
+ break;
+ default:
+ bb_perror_msg("error %sing key '%s'",
+ option_mask32 & FLAG_WRITE ?
+ "sett" : "read",
+ outname);
+ break;
+ }
+ retval = EXIT_FAILURE;
+ goto end;
+ }
+
+ if (option_mask32 & FLAG_WRITE) {
+//TODO: procps 3.2.7 writes "value\n", note trailing "\n"
+ xwrite_str(fd, value);
+ close(fd);
+ if (option_mask32 & FLAG_SHOW_KEYS)
+ printf("%s = ", outname);
+ puts(value);
+ } else {
+ char c;
+
+ value = cptr = xmalloc_read(fd, NULL);
+ close(fd);
+ if (value == NULL) {
+ bb_perror_msg("error reading key '%s'", outname);
+ goto end;
+ }
+
+ /* dev.cdrom.info and sunrpc.transports, for example,
+ * are multi-line. Try "sysctl sunrpc.transports"
+ */
+ while ((c = *cptr) != '\0') {
+ if (option_mask32 & FLAG_SHOW_KEYS)
+ printf("%s = ", outname);
+ while (1) {
+ fputc(c, stdout);
+ cptr++;
+ if (c == '\n')
+ break;
+ c = *cptr;
+ if (c == '\0')
+ break;
+ }
+ }
+ free(value);
+ }
+ end:
+ free(outname);
+ return retval;
+}
+
+static int sysctl_act_recursive(const char *path)
+{
+ DIR *dirp;
+ struct stat buf;
+ struct dirent *entry;
+ char *next;
+ int retval = 0;
+
+ stat(path, &buf);
+ if (S_ISDIR(buf.st_mode) && !(option_mask32 & FLAG_WRITE)) {
+ dirp = opendir(path);
+ if (dirp == NULL)
+ return -1;
+ while ((entry = readdir(dirp)) != NULL) {
+ next = concat_subpath_file(path, entry->d_name);
+ if (next == NULL)
+ continue; /* d_name is "." or ".." */
+ /* if path was ".", drop "./" prefix: */
+ retval |= sysctl_act_recursive((next[0] == '.' && next[1] == '/') ?
+ next + 2 : next);
+ free(next);
+ }
+ closedir(dirp);
+ } else {
+ char *name = xstrdup(path);
+ retval |= sysctl_act_on_setting(name);
+ free(name);
+ }
+
+ return retval;
+}
+
+/* Set sysctl's from a conf file. Format example:
+ * # Controls IP packet forwarding
+ * net.ipv4.ip_forward = 0
+ */
+static int sysctl_handle_preload_file(const char *filename)
+{
+ char *token[2];
+ parser_t *parser;
+
+ parser = config_open(filename);
+ /* Must do it _after_ config_open(): */
+ xchdir("/proc/sys");
+ /* xchroot(".") - if you are paranoid */
+
+//TODO: ';' is comment char too
+//TODO: comment may be only at line start. "var=1 #abc" - "1 #abc" is the value
+// (but _whitespace_ from ends should be trimmed first (and we do it right))
+//TODO: "var==1" is mishandled (must use "=1" as a value, but uses "1")
+ while (config_read(parser, token, 2, 2, "# \t=", PARSE_NORMAL)) {
+ char *tp;
+ sysctl_dots_to_slashes(token[0]);
+ tp = xasprintf("%s=%s", token[0], token[1]);
+ sysctl_act_recursive(tp);
+ free(tp);
+ }
+ if (ENABLE_FEATURE_CLEAN_UP)
+ config_close(parser);
+ return 0;
+}
+
+int sysctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int sysctl_main(int argc UNUSED_PARAM, char **argv)
+{
+ int retval;
+ int opt;
+
+ opt = getopt32(argv, "+" OPTION_STR); /* '+' - stop on first non-option */
+ argv += optind;
+ opt ^= (FLAG_SHOW_KEYS | FLAG_SHOW_KEY_ERRORS);
+ option_mask32 = opt;
+
+ if (opt & FLAG_PRELOAD_FILE) {
+ option_mask32 |= FLAG_WRITE;
+ /* xchdir("/proc/sys") is inside */
+ return sysctl_handle_preload_file(*argv ? *argv : "/etc/sysctl.conf");
+ }
+ xchdir("/proc/sys");
+ /* xchroot(".") - if you are paranoid */
+ if (opt & (FLAG_TABLE_FORMAT | FLAG_SHOW_ALL)) {
+ return sysctl_act_recursive(".");
+ }
+
+ retval = 0;
+ while (*argv) {
+ sysctl_dots_to_slashes(*argv);
+ retval |= sysctl_act_recursive(*argv);
+ argv++;
+ }
+
+ return retval;
+}