procps/sysctl.c

593 lines
15 KiB
C
Raw Normal View History

2002-02-02 04:17:29 +05:30
/*
* Sysctl 1.01 - A utility to read and manipulate the sysctl parameters
*
*
* "Copyright 1999 George Staikos
* This file may be used subject to the terms and conditions of the
* GNU General Public License Version 2, or any later version
* at your option, as published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details."
*
* Changelog:
* v1.01:
* - added -p <preload> to preload values from a file
2004-07-15 10:14:42 +05:30
* Horms:
* - added -q to be quiet when modifying values
*
* Changes by Albert Cahalan, 2002.
2002-02-02 04:17:29 +05:30
*/
#include <dirent.h>
#include <errno.h>
#include <getopt.h>
#include <libgen.h>
2002-02-02 04:17:29 +05:30
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
2002-02-02 04:17:29 +05:30
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
2002-11-27 13:51:30 +05:30
#include "proc/procps.h"
2002-12-12 04:25:42 +05:30
#include "proc/version.h"
2002-02-02 04:17:29 +05:30
/* Proof that C++ causes brain damage: */
2002-12-12 04:25:42 +05:30
typedef int bool;
2002-02-02 04:17:29 +05:30
static bool true = 1;
static bool false = 0;
/*
* Globals...
*/
2002-10-10 03:02:33 +05:30
static const char PROC_PATH[] = "/proc/sys/";
static const char DEFAULT_PRELOAD[] = "/etc/sysctl.conf";
2004-07-15 20:52:23 +05:30
static bool NameOnly;
2002-02-02 04:17:29 +05:30
static bool PrintName;
static bool PrintNewline;
2002-12-12 04:25:42 +05:30
static bool IgnoreError;
2004-07-15 10:14:42 +05:30
static bool Quiet;
2002-02-02 04:17:29 +05:30
/* error messages */
2005-01-06 02:51:58 +05:30
static const char ERR_MALFORMED_SETTING[] = "error: Malformed setting \"%s\"\n";
static const char ERR_NO_EQUALS[] = "error: \"%s\" must be of the form name=value\n";
static const char ERR_INVALID_KEY[] = "error: \"%s\" is an unknown key\n";
static const char ERR_UNKNOWN_WRITING[] = "error: \"%s\" setting key \"%s\"\n";
static const char ERR_UNKNOWN_READING[] = "error: \"%s\" reading key \"%s\"\n";
2002-10-10 03:02:33 +05:30
static const char ERR_PERMISSION_DENIED[] = "error: permission denied on key '%s'\n";
2005-01-06 02:51:58 +05:30
static const char ERR_OPENING_DIR[] = "error: unable to open directory \"%s\"\n";
static const char ERR_PRELOAD_FILE[] = "error: unable to open preload file \"%s\"\n";
2002-10-10 03:02:33 +05:30
static const char WARN_BAD_LINE[] = "warning: %s(%d): invalid syntax, continuing...\n";
2002-02-02 04:17:29 +05:30
2002-11-26 04:54:40 +05:30
static void slashdot(char *restrict p, char old, char new){
2002-10-09 11:53:58 +05:30
p = strpbrk(p,"/.");
if(!p) return; /* nothing -- can't be, but oh well */
if(*p==new) return; /* already in desired format */
while(p){
char c = *p;
if(c==old) *p=new;
if(c==new) *p=old;
p = strpbrk(p+1,"/.");
}
}
2002-02-02 04:17:29 +05:30
/*
* Display the usage format
*
*/
static void __attribute__ ((__noreturn__))
Usage(FILE * out)
{
fprintf(out,
"\nUsage: %s [options] [variable[=value] ...]\n"
"\nOptions:\n", program_invocation_short_name);
fprintf(out,
" -a, --all display all variables\n"
" -A alias of -a\n"
" -X alias of -a\n"
" -b, --binary print value without new line\n"
" -e, --ignore ignore unknown variables errors\n"
" -N, --names print variable names without values\n"
" -n, --values print only values of a variables\n"
" -p, --load[=<file>] read values from file\n"
" -f alias of -p\n"
" -q, --quiet do not echo variable set\n"
" -w, --write enable writing a value to variable\n"
" -o does nothing\n"
" -x does nothing\n"
" -h, --help display this help text\n"
" -d alias of -h\n"
" -V, --version display version information and exit\n");
fprintf(out, "\nFor more information see sysctl(8).\n");
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
2002-12-12 04:25:42 +05:30
}
2002-02-02 04:17:29 +05:30
/*
* Strip the leading and trailing spaces from a string
*
*/
2002-10-10 03:02:33 +05:30
static char *StripLeadingAndTrailingSpaces(char *oneline) {
char *t;
2002-02-02 04:17:29 +05:30
2002-10-10 03:02:33 +05:30
if (!oneline || !*oneline)
return oneline;
2002-02-02 04:17:29 +05:30
2002-10-10 03:02:33 +05:30
t = oneline;
t += strlen(oneline)-1;
2002-02-02 04:17:29 +05:30
2002-10-10 03:02:33 +05:30
while ((*t==' ' || *t=='\t' || *t=='\n' || *t=='\r') && t!=oneline)
*t-- = 0;
2002-02-02 04:17:29 +05:30
2002-10-10 03:02:33 +05:30
t = oneline;
2002-02-02 04:17:29 +05:30
2002-10-10 03:02:33 +05:30
while ((*t==' ' || *t=='\t') && *t!=0)
t++;
2002-02-02 04:17:29 +05:30
2002-10-10 03:02:33 +05:30
return t;
2002-12-12 04:25:42 +05:30
}
2002-02-02 04:17:29 +05:30
2004-07-15 20:52:23 +05:30
static int DisplayAll(const char *restrict const path);
2002-02-02 04:17:29 +05:30
/*
2002-11-26 03:12:17 +05:30
* Read a sysctl setting
2002-02-02 04:17:29 +05:30
*
*/
2002-11-26 04:54:40 +05:30
static int ReadSetting(const char *restrict const name) {
2002-11-26 03:12:17 +05:30
int rc = 0;
2002-11-26 04:54:40 +05:30
char *restrict tmpname;
char *restrict outname;
2002-11-26 03:12:17 +05:30
char inbuf[1025];
2002-11-26 04:54:40 +05:30
FILE *restrict fp;
struct stat ts;
2002-02-02 04:17:29 +05:30
2002-11-26 04:54:40 +05:30
if (!name || !*name) {
fprintf(stderr, ERR_INVALID_KEY, name);
return -1;
}
2002-02-02 04:17:29 +05:30
2002-11-26 03:12:17 +05:30
/* used to open the file */
tmpname = malloc(strlen(name)+strlen(PROC_PATH)+2);
2002-11-26 03:12:17 +05:30
strcpy(tmpname, PROC_PATH);
strcat(tmpname, name);
slashdot(tmpname+strlen(PROC_PATH),'.','/'); /* change . to / */
2002-02-02 04:17:29 +05:30
2002-11-26 03:12:17 +05:30
/* used to display the output */
outname = strdup(name);
slashdot(outname,'/','.'); /* change / to . */
2002-02-02 04:17:29 +05:30
if (stat(tmpname, &ts) < 0) {
if (!IgnoreError) {
perror(tmpname);
rc = -1;
}
goto out;
}
if ((ts.st_mode & S_IRUSR) == 0)
goto out;
if (S_ISDIR(ts.st_mode)) {
size_t len;
len = strlen(tmpname);
tmpname[len] = '/';
tmpname[len+1] = '\0';
rc = DisplayAll(tmpname);
goto out;
}
2002-11-26 03:12:17 +05:30
fp = fopen(tmpname, "r");
2002-02-02 04:17:29 +05:30
2002-11-26 03:12:17 +05:30
if (!fp) {
switch(errno) {
case ENOENT:
2002-12-12 04:25:42 +05:30
if (!IgnoreError) {
fprintf(stderr, ERR_INVALID_KEY, outname);
rc = -1;
}
break;
2002-11-26 03:12:17 +05:30
case EACCES:
fprintf(stderr, ERR_PERMISSION_DENIED, outname);
2002-12-12 04:25:42 +05:30
rc = -1;
break;
2002-11-26 03:12:17 +05:30
default:
2005-01-06 02:51:58 +05:30
fprintf(stderr, ERR_UNKNOWN_READING, strerror(errno), outname);
2002-12-12 04:25:42 +05:30
rc = -1;
break;
}
2002-11-26 03:12:17 +05:30
} else {
errno = 0;
2004-07-15 20:52:23 +05:30
if(fgets(inbuf, sizeof inbuf - 1, fp)) {
// this loop is required, see
// /sbin/sysctl -a | egrep -6 dev.cdrom.info
do {
if (NameOnly) {
fprintf(stdout, "%s\n", outname);
} else {
/* already has the \n in it */
if (PrintName) {
fprintf(stdout, "%s = %s", outname, inbuf);
} else {
if (!PrintNewline) {
char *nlptr = strchr(inbuf,'\n');
if(nlptr) *nlptr='\0';
}
fprintf(stdout, "%s", inbuf);
}
2002-11-26 03:12:17 +05:30
}
2004-07-15 20:52:23 +05:30
} while(fgets(inbuf, sizeof inbuf - 1, fp));
} else {
switch(errno) {
case EACCES:
fprintf(stderr, ERR_PERMISSION_DENIED, outname);
rc = -1;
break;
case EISDIR:{
size_t len;
len = strlen(tmpname);
tmpname[len] = '/';
tmpname[len+1] = '\0';
fclose(fp);
2004-07-15 20:52:23 +05:30
rc = DisplayAll(tmpname);
goto out;
2004-07-15 20:52:23 +05:30
}
default:
2005-01-06 02:51:58 +05:30
fprintf(stderr, ERR_UNKNOWN_READING, strerror(errno), outname);
2004-07-15 20:52:23 +05:30
rc = -1;
case 0:
2004-07-15 20:52:23 +05:30
break;
2002-11-26 03:12:17 +05:30
}
2002-12-12 04:25:42 +05:30
}
2002-11-26 03:12:17 +05:30
fclose(fp);
2002-12-12 04:25:42 +05:30
}
out:
2002-11-26 03:12:17 +05:30
free(tmpname);
free(outname);
return rc;
2002-12-12 04:25:42 +05:30
}
2002-02-02 04:17:29 +05:30
2002-11-26 03:12:17 +05:30
/*
* Display all the sysctl settings
*
*/
2004-07-15 20:52:23 +05:30
static int DisplayAll(const char *restrict const path) {
2002-11-26 03:12:17 +05:30
int rc = 0;
int rc2;
2002-11-26 04:54:40 +05:30
DIR *restrict dp;
struct dirent *restrict de;
2002-11-26 03:12:17 +05:30
struct stat ts;
2002-02-02 04:17:29 +05:30
2002-11-26 03:12:17 +05:30
dp = opendir(path);
if (!dp) {
fprintf(stderr, ERR_OPENING_DIR, path);
rc = -1;
} else {
2004-07-15 20:52:23 +05:30
readdir(dp); // skip .
readdir(dp); // skip ..
2002-11-26 03:12:17 +05:30
while (( de = readdir(dp) )) {
2004-07-15 20:52:23 +05:30
char *restrict tmpdir;
2002-11-26 04:54:40 +05:30
tmpdir = (char *restrict)malloc(strlen(path)+strlen(de->d_name)+2);
2002-11-26 03:12:17 +05:30
sprintf(tmpdir, "%s%s", path, de->d_name);
2004-07-15 20:52:23 +05:30
rc2 = stat(tmpdir, &ts);
2002-11-26 03:12:17 +05:30
if (rc2 != 0) {
perror(tmpdir);
} else {
if (S_ISDIR(ts.st_mode)) {
strcat(tmpdir, "/");
2004-07-15 20:52:23 +05:30
DisplayAll(tmpdir);
2002-11-26 03:12:17 +05:30
} else {
rc |= ReadSetting(tmpdir+strlen(PROC_PATH));
2002-11-26 04:54:40 +05:30
}
}
2002-11-26 03:12:17 +05:30
free(tmpdir);
2002-11-26 04:54:40 +05:30
}
2002-11-26 03:12:17 +05:30
closedir(dp);
2002-11-26 04:54:40 +05:30
}
2002-11-26 03:12:17 +05:30
return rc;
2002-11-26 04:54:40 +05:30
}
2002-02-02 04:17:29 +05:30
/*
* Write a sysctl setting
*
*/
2002-10-10 03:02:33 +05:30
static int WriteSetting(const char *setting) {
int rc = 0;
const char *name = setting;
const char *value;
const char *equals;
char *tmpname;
char *outname;
FILE *fp;
struct stat ts;
2002-02-02 04:17:29 +05:30
2002-10-09 11:53:58 +05:30
if (!name) { /* probably don't want to display this err */
2002-02-02 04:17:29 +05:30
return 0;
} /* end if */
equals = strchr(setting, '=');
2002-02-02 04:17:29 +05:30
if (!equals) {
fprintf(stderr, ERR_NO_EQUALS, setting);
return -1;
2002-12-12 04:25:42 +05:30
}
2002-02-02 04:17:29 +05:30
2002-10-09 11:53:58 +05:30
value = equals + 1; /* point to the value in name=value */
2002-02-02 04:17:29 +05:30
if (!*name || !*value || name == equals) {
fprintf(stderr, ERR_MALFORMED_SETTING, setting);
return -2;
2002-12-12 04:25:42 +05:30
}
2002-02-02 04:17:29 +05:30
2002-10-09 11:53:58 +05:30
/* used to open the file */
tmpname = malloc(equals-name+1+strlen(PROC_PATH));
2002-02-02 04:17:29 +05:30
strcpy(tmpname, PROC_PATH);
strncat(tmpname, name, (int)(equals-name));
tmpname[equals-name+strlen(PROC_PATH)] = 0;
2002-10-09 11:53:58 +05:30
slashdot(tmpname+strlen(PROC_PATH),'.','/'); /* change . to / */
/* used to display the output */
outname = malloc(equals-name+1);
2002-02-02 04:17:29 +05:30
strncpy(outname, name, (int)(equals-name));
outname[equals-name] = 0;
2002-10-09 11:53:58 +05:30
slashdot(outname,'/','.'); /* change / to . */
2002-02-02 04:17:29 +05:30
if (stat(tmpname, &ts) < 0) {
if (!IgnoreError) {
perror(tmpname);
rc = -1;
}
goto out;
}
if ((ts.st_mode & S_IWUSR) == 0) {
fprintf(stderr, ERR_UNKNOWN_WRITING, strerror(EACCES), outname);
goto out;
}
if (S_ISDIR(ts.st_mode)) {
fprintf(stderr, ERR_UNKNOWN_WRITING, strerror(EACCES), outname);
goto out;
}
2002-02-02 04:17:29 +05:30
fp = fopen(tmpname, "w");
if (!fp) {
switch(errno) {
case ENOENT:
2002-12-12 04:25:42 +05:30
if (!IgnoreError) {
fprintf(stderr, ERR_INVALID_KEY, outname);
rc = -1;
}
break;
2002-02-02 04:17:29 +05:30
case EACCES:
fprintf(stderr, ERR_PERMISSION_DENIED, outname);
2002-12-12 04:25:42 +05:30
rc = -1;
break;
2002-02-02 04:17:29 +05:30
default:
2005-01-06 02:51:58 +05:30
fprintf(stderr, ERR_UNKNOWN_WRITING, strerror(errno), outname);
2002-12-12 04:25:42 +05:30
rc = -1;
break;
}
2002-02-02 04:17:29 +05:30
} else {
2004-07-15 10:14:42 +05:30
rc = fprintf(fp, "%s\n", value);
if (rc < 0) {
2005-01-06 02:51:58 +05:30
fprintf(stderr, ERR_UNKNOWN_WRITING, strerror(errno), outname);
2004-07-15 10:14:42 +05:30
fclose(fp);
2002-02-02 04:17:29 +05:30
} else {
2004-07-15 10:14:42 +05:30
rc=fclose(fp);
if (rc != 0)
2005-01-06 02:51:58 +05:30
fprintf(stderr, ERR_UNKNOWN_WRITING, strerror(errno), outname);
2004-07-15 10:14:42 +05:30
}
if (rc==0 && !Quiet) {
2004-07-15 20:52:23 +05:30
if (NameOnly) {
fprintf(stdout, "%s\n", outname);
2004-07-15 10:14:42 +05:30
} else {
2004-07-15 20:52:23 +05:30
if (PrintName) {
fprintf(stdout, "%s = %s\n", outname, value);
} else {
if (PrintNewline)
fprintf(stdout, "%s\n", value);
else
fprintf(stdout, "%s", value);
}
2004-07-15 10:14:42 +05:30
}
2002-02-02 04:17:29 +05:30
}
2002-12-12 04:25:42 +05:30
}
out:
2002-02-02 04:17:29 +05:30
free(tmpname);
free(outname);
2002-10-10 03:02:33 +05:30
return rc;
2002-12-12 04:25:42 +05:30
}
2002-02-02 04:17:29 +05:30
/*
2002-11-26 03:12:17 +05:30
* Preload the sysctl's from the conf file
* - we parse the file and then reform it (strip out whitespace)
2002-02-02 04:17:29 +05:30
*
*/
2002-12-12 04:25:42 +05:30
static int Preload(const char *restrict const filename) {
2002-12-29 05:27:10 +05:30
char oneline[256];
char buffer[256];
2002-10-10 03:02:33 +05:30
FILE *fp;
2002-11-26 03:12:17 +05:30
char *t;
int n = 0;
2002-12-12 04:25:42 +05:30
int rc = 0;
2002-11-26 03:12:17 +05:30
char *name, *value;
2002-02-02 04:17:29 +05:30
2006-06-25 02:47:51 +05:30
fp = (filename[0]=='-' && !filename[1])
? stdin
: fopen(filename, "r")
;
if (!fp) {
2002-11-26 03:12:17 +05:30
fprintf(stderr, ERR_PRELOAD_FILE, filename);
2002-12-12 04:25:42 +05:30
return -1;
}
2002-02-02 04:17:29 +05:30
2002-12-29 05:27:10 +05:30
while (fgets(oneline, sizeof oneline, fp)) {
2002-11-26 03:12:17 +05:30
n++;
t = StripLeadingAndTrailingSpaces(oneline);
2002-02-02 04:17:29 +05:30
2002-11-26 03:12:17 +05:30
if (strlen(t) < 2)
continue;
2002-02-02 04:17:29 +05:30
2002-11-26 03:12:17 +05:30
if (*t == '#' || *t == ';')
continue;
2002-02-02 04:17:29 +05:30
2002-11-26 03:12:17 +05:30
name = strtok(t, "=");
if (!name || !*name) {
fprintf(stderr, WARN_BAD_LINE, filename, n);
continue;
2002-12-12 04:25:42 +05:30
}
2002-02-02 04:17:29 +05:30
2002-11-26 03:12:17 +05:30
StripLeadingAndTrailingSpaces(name);
value = strtok(NULL, "\n\r");
if (!value || !*value) {
fprintf(stderr, WARN_BAD_LINE, filename, n);
continue;
2002-12-12 04:25:42 +05:30
}
2002-11-26 03:12:17 +05:30
while ((*value == ' ' || *value == '\t') && *value != 0)
value++;
2004-07-15 20:52:23 +05:30
// should NameOnly affect this?
2002-11-26 03:12:17 +05:30
sprintf(buffer, "%s=%s", name, value);
2002-12-12 04:25:42 +05:30
rc |= WriteSetting(buffer);
}
2002-11-26 03:12:17 +05:30
fclose(fp);
2002-12-12 04:25:42 +05:30
return rc;
}
2002-02-02 04:17:29 +05:30
/*
2002-11-26 03:12:17 +05:30
* Main...
2002-02-02 04:17:29 +05:30
*
*/
int main(int argc, char *argv[])
{
2002-11-26 03:12:17 +05:30
bool SwitchesAllowed = true;
bool WriteMode = false;
bool DisplayAllOpt = false;
bool preloadfileOpt = false;
2002-11-26 03:12:17 +05:30
int ReturnCode = 0;
int c;
2002-11-26 03:12:17 +05:30
const char *preloadfile = DEFAULT_PRELOAD;
2002-02-02 04:17:29 +05:30
static const struct option longopts[] = {
{"all", no_argument, NULL, 'a'},
{"binary", no_argument, NULL, 'b'},
{"ignore", no_argument, NULL, 'e'},
{"names", no_argument, NULL, 'N'},
{"values", no_argument, NULL, 'n'},
{"load", optional_argument, NULL, 'p'},
{"quiet", no_argument, NULL, 'q'},
{"write", no_argument, NULL, 'w'},
{"help", no_argument, NULL, 'h'},
{"version", no_argument, NULL, 'V'},
{NULL, 0, NULL, 0}
};
2002-11-26 03:12:17 +05:30
PrintName = true;
PrintNewline = true;
2002-12-12 04:25:42 +05:30
IgnoreError = false;
2004-07-15 10:14:42 +05:30
Quiet = false;
2002-02-02 04:17:29 +05:30
2002-11-26 03:12:17 +05:30
if (argc < 2) {
Usage(stderr);
2002-12-12 10:19:39 +05:30
}
2002-02-02 04:17:29 +05:30
while ((c =
getopt_long(argc, argv, "bneNwfpqoxaAXVdh", longopts,
NULL)) != -1)
switch (c) {
case 'b':
/* This is "binary" format, which means more for BSD. */
PrintNewline = false;
/* FALL THROUGH */
case 'n':
PrintName = false;
break;
case 'e':
/*
* For FreeBSD, -e means a "%s=%s\n" format. ("%s: %s\n" default)
* We (and NetBSD) use "%s = %s\n" always, and -e to ignore errors.
*/
IgnoreError = true;
break;
case 'N':
NameOnly = true;
break;
case 'w':
SwitchesAllowed = false;
WriteMode = true;
break;
case 'f': /* the NetBSD way */
case 'p':
preloadfileOpt = true;
if (optarg)
preloadfile = optarg;
2004-07-15 20:52:23 +05:30
break;
case 'q':
Quiet = true;
break;
case 'o': /* BSD: binary values too, 1st 16 bytes in hex */
case 'x': /* BSD: binary values too, whole thing in hex */
/* does nothing */ ;
break;
case 'a': /* string and integer values (for Linux, all of them) */
case 'A': /* same as -a -o */
case 'X': /* same as -a -x */
DisplayAllOpt = true;
2002-11-26 03:12:17 +05:30
break;
case 'V':
fprintf(stdout, "sysctl (%s)\n",procps_version);
exit(0);
case 'd': /* BSD: print description ("vm.kvm_size: Size of KVM") */
case 'h': /* BSD: human-readable (did FreeBSD 5 make -e default?) */
case '?':
Usage(stdout);
default:
Usage(stderr);
2002-12-12 04:25:42 +05:30
}
if (DisplayAllOpt)
return DisplayAll(PROC_PATH);
if (preloadfileOpt)
return Preload(preloadfile);
argc -= optind;
argv += optind;
if (argc < 1) {
warnx("no variables specified");
Usage(stderr);
}
if (NameOnly && Quiet) {
warnx("options -N and -q can not coexist");
Usage(stderr);
}
if (WriteMode || index(*argv, '='))
ReturnCode = WriteSetting(*argv);
else
ReturnCode = ReadSetting(*argv);
2002-11-26 03:12:17 +05:30
2002-12-12 04:25:42 +05:30
return ReturnCode;
}
2002-11-26 03:12:17 +05:30
2002-02-02 04:17:29 +05:30