mirror of
https://github.com/sheumann/hush.git
synced 2025-01-13 21:31:51 +00:00
sysctl: move code around to get rid of forward references.
(incidentally it helps gcc to make code smaller)
This commit is contained in:
Denis Vlasenko
parent
5a6617acb8
commit
038fe44713
209
procps/sysctl.c
209
procps/sysctl.c
@ -7,20 +7,12 @@
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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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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*
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* v1.01 - added -p <preload> to preload values from a file
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* v1.01.1 - busybox applet aware by <solar@gentoo.org>
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*/
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#include "libbb.h"
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static int sysctl_act_on_setting(char *setting);
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static int sysctl_display_all(const char *path);
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static int sysctl_handle_preload_file(const char *filename);
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static void sysctl_dots_to_slashes(char *name);
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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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@ -29,67 +21,52 @@ enum {
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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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#define OPTION_STR "neAapw"
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int sysctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int sysctl_main(int argc UNUSED_PARAM, char **argv)
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static void sysctl_dots_to_slashes(char *name)
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{
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int retval;
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int opt;
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char *cptr, *last_good, *end;
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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 = opt;
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/* Convert minimum number of '.' to '/' so that
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* we end up with existing file's name.
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*
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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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* NB: net/ipv4/conf/eth0/mc_forwarding *also exists*,
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* therefore we must start from the end, and if
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* we replaced even one . -> /, start over again,
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* but never replace dots before the position
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* where last replacement occurred.
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*
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* Another bug we later had is that
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* net.ipv4.conf.eth0.100
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* (without .mc_forwarding) was mishandled.
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*
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* To set up testing: modprobe 8021q; vconfig add eth0 100
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*/
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end = name + strlen(name);
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last_good = name - 1;
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*end = '.'; /* trick the loop into trying full name too */
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if (opt & FLAG_PRELOAD_FILE) {
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option_mask32 |= FLAG_WRITE;
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/* xchdir("/proc/sys") is inside */
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return sysctl_handle_preload_file(*argv ? *argv : "/etc/sysctl.conf");
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again:
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cptr = end;
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while (cptr > last_good) {
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if (*cptr == '.') {
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*cptr = '\0';
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//bb_error_msg("trying:'%s'", name);
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if (access(name, F_OK) == 0) {
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if (cptr != end) /* prevent trailing '/' */
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*cptr = '/';
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//bb_error_msg("replaced:'%s'", name);
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last_good = cptr;
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goto again;
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}
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*cptr = '.';
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}
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cptr--;
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}
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xchdir("/proc/sys");
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/* xchroot(".") - if you are paranoid */
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if (opt & (FLAG_TABLE_FORMAT | FLAG_SHOW_ALL)) {
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return sysctl_display_all(".");
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}
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retval = 0;
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while (*argv) {
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sysctl_dots_to_slashes(*argv);
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retval |= sysctl_display_all(*argv);
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argv++;
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}
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return retval;
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}
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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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*/
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static int sysctl_handle_preload_file(const char *filename)
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{
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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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/* Must do it _after_ config_open(): */
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xchdir("/proc/sys");
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/* xchroot(".") - if you are paranoid */
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//TODO: ';' is comment char too
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//TODO: comment may be only at line start. "var=1 #abc" - "1 #abc" is the value
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// (but _whitespace_ from ends should be trimmed first (and we do it right))
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//TODO: "var==1" is mishandled (must use "=1" as a value, but uses "1")
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while (config_read(parser, token, 2, 2, "# \t=", PARSE_NORMAL)) {
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sysctl_dots_to_slashes(token[0]);
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/* Save ~4 bytes by using parser internals */
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/* parser->line is big enough for sprintf */
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sprintf(parser->line, "%s=%s", token[0], token[1]);
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sysctl_display_all(parser->line);
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}
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if (ENABLE_FEATURE_CLEAN_UP)
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config_close(parser);
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return 0;
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*end = '\0';
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}
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static int sysctl_act_on_setting(char *setting)
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@ -186,7 +163,7 @@ static int sysctl_act_on_setting(char *setting)
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return retval;
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}
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static int sysctl_display_all(const char *path)
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static int sysctl_act_recursive(const char *path)
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{
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DIR *dirp;
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struct stat buf;
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@ -204,7 +181,7 @@ static int sysctl_display_all(const char *path)
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if (next == NULL)
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continue; /* d_name is "." or ".." */
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/* if path was ".", drop "./" prefix: */
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retval |= sysctl_display_all((next[0] == '.' && next[1] == '/') ?
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retval |= sysctl_act_recursive((next[0] == '.' && next[1] == '/') ?
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next + 2 : next);
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free(next);
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}
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@ -218,48 +195,64 @@ static int sysctl_display_all(const char *path)
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return retval;
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}
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static void sysctl_dots_to_slashes(char *name)
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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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*/
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static int sysctl_handle_preload_file(const char *filename)
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{
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char *cptr, *last_good, *end;
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char *token[2];
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parser_t *parser;
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/* Convert minimum number of '.' to '/' so that
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* we end up with existing file's name.
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*
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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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* NB: net/ipv4/conf/eth0/mc_forwarding *also exists*,
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* therefore we must start from the end, and if
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* we replaced even one . -> /, start over again,
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* but never replace dots before the position
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* where last replacement occurred.
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*
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* Another bug we later had is that
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* net.ipv4.conf.eth0.100
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* (without .mc_forwarding) was mishandled.
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*
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* To set up testing: modprobe 8021q; vconfig add eth0 100
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*/
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end = name + strlen(name);
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last_good = name - 1;
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*end = '.'; /* trick the loop into trying full name too */
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parser = config_open(filename);
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/* Must do it _after_ config_open(): */
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xchdir("/proc/sys");
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/* xchroot(".") - if you are paranoid */
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again:
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cptr = end;
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while (cptr > last_good) {
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if (*cptr == '.') {
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*cptr = '\0';
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//bb_error_msg("trying:'%s'", name);
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if (access(name, F_OK) == 0) {
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if (cptr != end) /* prevent trailing '/' */
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*cptr = '/';
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//bb_error_msg("replaced:'%s'", name);
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last_good = cptr;
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goto again;
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}
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*cptr = '.';
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}
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cptr--;
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//TODO: ';' is comment char too
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//TODO: comment may be only at line start. "var=1 #abc" - "1 #abc" is the value
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// (but _whitespace_ from ends should be trimmed first (and we do it right))
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//TODO: "var==1" is mishandled (must use "=1" as a value, but uses "1")
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while (config_read(parser, token, 2, 2, "# \t=", PARSE_NORMAL)) {
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sysctl_dots_to_slashes(token[0]);
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/* Save ~4 bytes by using parser internals */
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/* parser->line is big enough for sprintf */
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sprintf(parser->line, "%s=%s", token[0], token[1]);
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sysctl_act_recursive(parser->line);
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}
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*end = '\0';
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if (ENABLE_FEATURE_CLEAN_UP)
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config_close(parser);
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return 0;
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}
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int sysctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int sysctl_main(int argc UNUSED_PARAM, char **argv)
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{
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int retval;
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int opt;
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opt = getopt32(argv, "+" OPTION_STR); /* '+' - 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 = opt;
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if (opt & FLAG_PRELOAD_FILE) {
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option_mask32 |= FLAG_WRITE;
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/* xchdir("/proc/sys") is inside */
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return sysctl_handle_preload_file(*argv ? *argv : "/etc/sysctl.conf");
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}
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xchdir("/proc/sys");
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/* xchroot(".") - if you are paranoid */
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if (opt & (FLAG_TABLE_FORMAT | FLAG_SHOW_ALL)) {
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return sysctl_act_recursive(".");
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}
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retval = 0;
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while (*argv) {
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sysctl_dots_to_slashes(*argv);
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retval |= sysctl_act_recursive(*argv);
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argv++;
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}
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return retval;
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}
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