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-rw-r--r--procps/sysctl.c209
1 files changed, 101 insertions, 108 deletions
diff --git a/procps/sysctl.c b/procps/sysctl.c
index dce264dac..d0ff20ec7 100644
--- a/procps/sysctl.c
+++ b/procps/sysctl.c
@@ -7,20 +7,12 @@
* 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>
- *
+ * v1.01 - added -p <preload> to preload values from a file
+ * v1.01.1 - busybox applet aware by <solar@gentoo.org>
*/
#include "libbb.h"
-static int sysctl_act_on_setting(char *setting);
-static int sysctl_display_all(const char *path);
-static int sysctl_handle_preload_file(const char *filename);
-static void sysctl_dots_to_slashes(char *name);
-
enum {
FLAG_SHOW_KEYS = 1 << 0,
FLAG_SHOW_KEY_ERRORS = 1 << 1,
@@ -29,67 +21,52 @@ enum {
FLAG_PRELOAD_FILE = 1 << 4,
FLAG_WRITE = 1 << 5,
};
+#define OPTION_STR "neAapw"
-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, "+neAapw"); /* '+' - 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_display_all(".");
- }
-
- retval = 0;
- while (*argv) {
- sysctl_dots_to_slashes(*argv);
- retval |= sysctl_display_all(*argv);
- argv++;
- }
-
- 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)
+static void sysctl_dots_to_slashes(char *name)
{
- char *token[2];
- parser_t *parser;
+ char *cptr, *last_good, *end;
- parser = config_open(filename);
- /* Must do it _after_ config_open(): */
- xchdir("/proc/sys");
- /* xchroot(".") - if you are paranoid */
+ /* 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 */
-//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)) {
- sysctl_dots_to_slashes(token[0]);
- /* Save ~4 bytes by using parser internals */
- /* parser->line is big enough for sprintf */
- sprintf(parser->line, "%s=%s", token[0], token[1]);
- sysctl_display_all(parser->line);
+ 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--;
}
- if (ENABLE_FEATURE_CLEAN_UP)
- config_close(parser);
- return 0;
+ *end = '\0';
}
static int sysctl_act_on_setting(char *setting)
@@ -186,7 +163,7 @@ static int sysctl_act_on_setting(char *setting)
return retval;
}
-static int sysctl_display_all(const char *path)
+static int sysctl_act_recursive(const char *path)
{
DIR *dirp;
struct stat buf;
@@ -204,7 +181,7 @@ static int sysctl_display_all(const char *path)
if (next == NULL)
continue; /* d_name is "." or ".." */
/* if path was ".", drop "./" prefix: */
- retval |= sysctl_display_all((next[0] == '.' && next[1] == '/') ?
+ retval |= sysctl_act_recursive((next[0] == '.' && next[1] == '/') ?
next + 2 : next);
free(next);
}
@@ -218,48 +195,64 @@ static int sysctl_display_all(const char *path)
return retval;
}
-static void sysctl_dots_to_slashes(char *name)
+/* 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 *cptr, *last_good, *end;
+ char *token[2];
+ parser_t *parser;
- /* 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 */
+ parser = config_open(filename);
+ /* Must do it _after_ config_open(): */
+ xchdir("/proc/sys");
+ /* xchroot(".") - if you are paranoid */
- 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--;
+//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)) {
+ sysctl_dots_to_slashes(token[0]);
+ /* Save ~4 bytes by using parser internals */
+ /* parser->line is big enough for sprintf */
+ sprintf(parser->line, "%s=%s", token[0], token[1]);
+ sysctl_act_recursive(parser->line);
}
- *end = '\0';
+ 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;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 20:47:30 +0000