[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Sysctl 1.01 - A utility to read and manipulate the sysctl parameters
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| 4 | *
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| 5 | * Copyright 1999 George Staikos
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 8 | *
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| 9 | * Changelog:
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| 10 | * v1.01:
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| 11 | * - added -p <preload> to preload values from a file
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| 12 | * v1.01.1
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| 13 | * - busybox applet aware by <solar@gentoo.org>
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| 14 | *
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| 15 | */
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| 16 |
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[1770] | 17 | #include "libbb.h"
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[821] | 18 |
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| 19 | /*
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| 20 | * Function Prototypes
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| 21 | */
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| 22 | static int sysctl_read_setting(const char *setting, int output);
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| 23 | static int sysctl_write_setting(const char *setting, int output);
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| 24 | static int sysctl_preload_file(const char *filename, int output);
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| 25 | static int sysctl_display_all(const char *path, int output, int show_table);
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| 26 |
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| 27 | /*
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| 28 | * Globals...
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| 29 | */
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[1770] | 30 | static const char PROC_PATH[] ALIGN1 = "/proc/sys/";
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| 31 | static const char DEFAULT_PRELOAD[] ALIGN1 = "/etc/sysctl.conf";
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[821] | 32 |
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| 33 | /* error messages */
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[1770] | 34 | static const char ERR_UNKNOWN_PARAMETER[] ALIGN1 =
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| 35 | "error: Unknown parameter '%s'\n";
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| 36 | static const char ERR_MALFORMED_SETTING[] ALIGN1 =
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| 37 | "error: Malformed setting '%s'\n";
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| 38 | static const char ERR_NO_EQUALS[] ALIGN1 =
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[821] | 39 | "error: '%s' must be of the form name=value\n";
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[1770] | 40 | static const char ERR_INVALID_KEY[] ALIGN1 =
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| 41 | "error: '%s' is an unknown key\n";
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| 42 | static const char ERR_UNKNOWN_WRITING[] ALIGN1 =
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[821] | 43 | "error: unknown error %d setting key '%s'\n";
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[1770] | 44 | static const char ERR_UNKNOWN_READING[] ALIGN1 =
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[821] | 45 | "error: unknown error %d reading key '%s'\n";
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[1770] | 46 | static const char ERR_PERMISSION_DENIED[] ALIGN1 =
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[821] | 47 | "error: permission denied on key '%s'\n";
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[1770] | 48 | static const char ERR_PRELOAD_FILE[] ALIGN1 =
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| 49 | "error: cannot open preload file '%s'\n";
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| 50 | static const char WARN_BAD_LINE[] ALIGN1 =
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[821] | 51 | "warning: %s(%d): invalid syntax, continuing...\n";
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| 52 |
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| 53 |
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| 54 | static void dwrite_str(int fd, const char *buf)
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| 55 | {
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| 56 | write(fd, buf, strlen(buf));
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| 57 | }
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| 58 |
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| 59 | /*
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| 60 | * sysctl_main()...
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| 61 | */
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[1770] | 62 | int sysctl_main(int argc, char **argv);
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[821] | 63 | int sysctl_main(int argc, char **argv)
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| 64 | {
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| 65 | int retval = 0;
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| 66 | int output = 1;
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| 67 | int write_mode = 0;
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| 68 | int switches_allowed = 1;
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| 69 |
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| 70 | if (argc < 2)
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| 71 | bb_show_usage();
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| 72 |
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| 73 | argv++;
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| 74 |
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| 75 | for (; argv && *argv && **argv; argv++) {
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| 76 | if (switches_allowed && **argv == '-') { /* we have a switch */
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| 77 | switch ((*argv)[1]) {
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| 78 | case 'n':
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| 79 | output = 0;
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| 80 | break;
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| 81 | case 'w':
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| 82 | write_mode = 1;
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| 83 | switches_allowed = 0;
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| 84 | break;
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| 85 | case 'p':
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| 86 | argv++;
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| 87 | return
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| 88 | sysctl_preload_file(((argv && *argv
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| 89 | && **argv) ? *argv :
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| 90 | DEFAULT_PRELOAD), output);
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| 91 | case 'a':
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| 92 | case 'A':
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| 93 | switches_allowed = 0;
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| 94 | return sysctl_display_all(PROC_PATH, output,
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| 95 | ((*argv)[1] == 'a') ? 0 : 1);
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| 96 | case 'h':
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| 97 | case '?':
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| 98 | bb_show_usage();
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| 99 | default:
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| 100 | bb_error_msg(ERR_UNKNOWN_PARAMETER, *argv);
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| 101 | bb_show_usage();
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| 102 | }
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| 103 | } else {
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| 104 | switches_allowed = 0;
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| 105 | if (write_mode)
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| 106 | retval = sysctl_write_setting(*argv, output);
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| 107 | else
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| 108 | sysctl_read_setting(*argv, output);
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| 109 | }
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| 110 | }
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| 111 | return retval;
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| 112 | } /* end sysctl_main() */
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| 113 |
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| 114 |
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| 115 |
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| 116 | /*
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| 117 | * sysctl_preload_file
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| 118 | * preload the sysctl's from a conf file
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| 119 | * - we parse the file and then reform it (strip out whitespace)
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| 120 | */
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| 121 | #define PRELOAD_BUF 256
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| 122 |
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| 123 | int sysctl_preload_file(const char *filename, int output)
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| 124 | {
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| 125 | int lineno = 0;
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| 126 | char oneline[PRELOAD_BUF];
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| 127 | char buffer[PRELOAD_BUF];
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| 128 | char *name, *value, *ptr;
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| 129 | FILE *fp = NULL;
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| 130 |
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| 131 | if (!filename || ((fp = fopen(filename, "r")) == NULL)) {
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| 132 | bb_error_msg_and_die(ERR_PRELOAD_FILE, filename);
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| 133 | }
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| 134 |
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| 135 | while (fgets(oneline, sizeof(oneline) - 1, fp)) {
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[1770] | 136 | oneline[sizeof(oneline) - 1] = '\0';
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[821] | 137 | lineno++;
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| 138 | trim(oneline);
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| 139 | ptr = (char *) oneline;
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| 140 |
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| 141 | if (*ptr == '#' || *ptr == ';')
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| 142 | continue;
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| 143 |
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| 144 | if (strlen(ptr) < 2)
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| 145 | continue;
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| 146 |
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| 147 | name = strtok(ptr, "=");
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| 148 | if (!name || !*name) {
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| 149 | bb_error_msg(WARN_BAD_LINE, filename, lineno);
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| 150 | continue;
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| 151 | }
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| 152 |
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| 153 | trim(name);
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| 154 |
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| 155 | value = strtok(NULL, "\n\r");
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| 156 | if (!value || !*value) {
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| 157 | bb_error_msg(WARN_BAD_LINE, filename, lineno);
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| 158 | continue;
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| 159 | }
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| 160 |
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| 161 | while ((*value == ' ' || *value == '\t') && *value != 0)
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| 162 | value++;
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[1770] | 163 | /* safe because sizeof(oneline) == sizeof(buffer) */
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| 164 | sprintf(buffer, "%s=%s", name, value);
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[821] | 165 | sysctl_write_setting(buffer, output);
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| 166 | }
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| 167 | fclose(fp);
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| 168 | return 0;
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| 169 | } /* end sysctl_preload_file() */
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| 170 |
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| 171 |
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| 172 | /*
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| 173 | * Write a single sysctl setting
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| 174 | */
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| 175 | int sysctl_write_setting(const char *setting, int output)
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| 176 | {
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| 177 | int retval = 0;
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| 178 | const char *name = setting;
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| 179 | const char *value;
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| 180 | const char *equals;
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| 181 | char *tmpname, *outname, *cptr;
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| 182 | int fd = -1;
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| 183 |
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| 184 | if (!name) /* probably dont' want to display this err */
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| 185 | return 0;
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| 186 |
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| 187 | if (!(equals = strchr(setting, '='))) {
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| 188 | bb_error_msg(ERR_NO_EQUALS, setting);
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| 189 | return -1;
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| 190 | }
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| 191 |
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| 192 | value = equals + sizeof(char); /* point to the value in name=value */
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| 193 |
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| 194 | if (!*name || !*value || name == equals) {
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| 195 | bb_error_msg(ERR_MALFORMED_SETTING, setting);
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| 196 | return -2;
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| 197 | }
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| 198 |
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[1770] | 199 | tmpname = xasprintf("%s%.*s", PROC_PATH, (int)(equals - name), name);
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| 200 | outname = xstrdup(tmpname + strlen(PROC_PATH));
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[821] | 201 |
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| 202 | while ((cptr = strchr(tmpname, '.')) != NULL)
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| 203 | *cptr = '/';
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| 204 |
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| 205 | while ((cptr = strchr(outname, '/')) != NULL)
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| 206 | *cptr = '.';
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| 207 |
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[1770] | 208 | fd = open(tmpname, O_WRONLY | O_CREAT | O_TRUNC, 0666);
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| 209 | if (fd < 0) {
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[821] | 210 | switch (errno) {
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| 211 | case ENOENT:
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| 212 | bb_error_msg(ERR_INVALID_KEY, outname);
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| 213 | break;
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| 214 | case EACCES:
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| 215 | bb_perror_msg(ERR_PERMISSION_DENIED, outname);
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| 216 | break;
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| 217 | default:
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| 218 | bb_error_msg(ERR_UNKNOWN_WRITING, errno, outname);
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| 219 | break;
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| 220 | }
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| 221 | retval = -1;
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| 222 | } else {
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| 223 | dwrite_str(fd, value);
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| 224 | close(fd);
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| 225 | if (output) {
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| 226 | dwrite_str(STDOUT_FILENO, outname);
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| 227 | dwrite_str(STDOUT_FILENO, " = ");
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| 228 | }
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| 229 | dwrite_str(STDOUT_FILENO, value);
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| 230 | dwrite_str(STDOUT_FILENO, "\n");
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| 231 | }
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| 232 |
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| 233 | /* cleanup */
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| 234 | free(tmpname);
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| 235 | free(outname);
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| 236 | return retval;
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| 237 | } /* end sysctl_write_setting() */
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| 238 |
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| 239 |
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| 240 | /*
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| 241 | * Read a sysctl setting
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| 242 | *
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| 243 | */
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| 244 | int sysctl_read_setting(const char *setting, int output)
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| 245 | {
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| 246 | int retval = 0;
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| 247 | char *tmpname, *outname, *cptr;
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| 248 | char inbuf[1025];
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| 249 | const char *name = setting;
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| 250 | FILE *fp;
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| 251 |
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| 252 | if (!setting || !*setting)
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| 253 | bb_error_msg(ERR_INVALID_KEY, setting);
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| 254 |
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| 255 | tmpname = concat_path_file(PROC_PATH, name);
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[1770] | 256 | outname = xstrdup(tmpname + strlen(PROC_PATH));
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[821] | 257 |
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| 258 | while ((cptr = strchr(tmpname, '.')) != NULL)
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| 259 | *cptr = '/';
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| 260 | while ((cptr = strchr(outname, '/')) != NULL)
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| 261 | *cptr = '.';
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| 262 |
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| 263 | if ((fp = fopen(tmpname, "r")) == NULL) {
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| 264 | switch (errno) {
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| 265 | case ENOENT:
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| 266 | bb_error_msg(ERR_INVALID_KEY, outname);
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| 267 | break;
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| 268 | case EACCES:
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| 269 | bb_error_msg(ERR_PERMISSION_DENIED, outname);
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| 270 | break;
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| 271 | default:
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| 272 | bb_error_msg(ERR_UNKNOWN_READING, errno, outname);
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| 273 | break;
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| 274 | }
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| 275 | retval = -1;
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| 276 | } else {
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| 277 | while (fgets(inbuf, sizeof(inbuf) - 1, fp)) {
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| 278 | if (output) {
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| 279 | dwrite_str(STDOUT_FILENO, outname);
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| 280 | dwrite_str(STDOUT_FILENO, " = ");
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| 281 | }
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| 282 | dwrite_str(STDOUT_FILENO, inbuf);
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| 283 | }
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| 284 | fclose(fp);
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| 285 | }
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| 286 |
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| 287 | free(tmpname);
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| 288 | free(outname);
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| 289 | return retval;
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| 290 | } /* end sysctl_read_setting() */
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| 291 |
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| 292 |
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| 293 |
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| 294 | /*
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| 295 | * Display all the sysctl settings
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| 296 | *
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| 297 | */
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| 298 | int sysctl_display_all(const char *path, int output, int show_table)
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| 299 | {
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| 300 | int retval = 0;
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| 301 | int retval2;
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| 302 | DIR *dp;
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| 303 | struct dirent *de;
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| 304 | char *tmpdir;
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| 305 | struct stat ts;
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| 306 |
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[1770] | 307 | dp = opendir(path);
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| 308 | if (!dp) {
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[821] | 309 | retval = -1;
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| 310 | } else {
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| 311 | while ((de = readdir(dp)) != NULL) {
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| 312 | tmpdir = concat_subpath_file(path, de->d_name);
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[1770] | 313 | if (tmpdir == NULL)
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[821] | 314 | continue;
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[1770] | 315 | retval2 = stat(tmpdir, &ts);
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| 316 | if (retval2 != 0)
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[821] | 317 | bb_perror_msg(tmpdir);
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| 318 | else {
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| 319 | if (S_ISDIR(ts.st_mode)) {
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| 320 | sysctl_display_all(tmpdir, output, show_table);
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| 321 | } else
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| 322 | retval |=
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| 323 | sysctl_read_setting(tmpdir + strlen(PROC_PATH),
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| 324 | output);
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| 325 |
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| 326 | }
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| 327 | free(tmpdir);
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| 328 | } /* end while */
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| 329 | closedir(dp);
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| 330 | }
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| 331 |
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| 332 | return retval;
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| 333 | } /* end sysctl_display_all() */
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