From 4aca87515a5083ae0e31ce3177189fd43b6d05ac Mon Sep 17 00:00:00 2001 From: Andreas Baumann Date: Sat, 3 Jan 2015 13:58:15 +0100 Subject: patch to Vanilla Tomato 1.28 --- release/src/router/busybox/procps/sysctl.c | 258 +++++++++++++++++++++++++++++ 1 file changed, 258 insertions(+) create mode 100644 release/src/router/busybox/procps/sysctl.c (limited to 'release/src/router/busybox/procps/sysctl.c') 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 to preload values from a file + * v1.01.1 - busybox applet aware by + */ + +#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; +} -- cgit v1.2.3-54-g00ecf