444 lines
11 KiB
C
444 lines
11 KiB
C
/*
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* Copyright (c) 2001 Peter Pentchev
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/sysctl.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#if defined(__FreeBSD_version)
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#if __FreeBSD_version < 500000
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#define NEED_SLASHTERM
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#endif /* < 500000 */
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#else /* defined(__FreeBSD_version) */
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/* just in case.. */
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#define NEED_SLASHTERM
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#endif /* defined(__FreeBSD_version) */
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/* the default sysctl name */
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#define PATHCTL "kern.module_path"
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/* queue structure for the module path broken down into components */
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TAILQ_HEAD(pathhead, pathentry);
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struct pathentry {
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char *path;
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TAILQ_ENTRY(pathentry) next;
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};
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/* the Management Information Base entries for the search path sysctl */
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static int mib[5];
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static size_t miblen;
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/* the sysctl name, defaults to PATHCTL */
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static char *pathctl;
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/* the sysctl value - the current module search path */
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static char *modpath;
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/* flag whether user actions require changing the sysctl value */
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static int changed;
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/* Top-level path management functions */
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static void addpath(struct pathhead *, char *, int, int);
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static void rempath(struct pathhead *, char *, int, int);
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static void showpath(struct pathhead *);
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/* Low-level path management functions */
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static char *qstring(struct pathhead *);
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/* sysctl-related functions */
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static void getmib(void);
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static void getpath(void);
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static void parsepath(struct pathhead *, char *, int);
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static void setpath(struct pathhead *);
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static void usage(void);
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/* Get the MIB entry for our sysctl */
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static void
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getmib(void)
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{
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/* have we already fetched it? */
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if (miblen != 0)
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return;
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miblen = sizeof(mib) / sizeof(mib[0]);
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if (sysctlnametomib(pathctl, mib, &miblen) != 0)
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err(1, "sysctlnametomib(%s)", pathctl);
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}
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/* Get the current module search path */
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static void
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getpath(void)
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{
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char *path;
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size_t sz;
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if (modpath != NULL) {
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free(modpath);
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modpath = NULL;
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}
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if (miblen == 0)
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getmib();
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if (sysctl(mib, miblen, NULL, &sz, NULL, NULL) == -1)
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err(1, "getting path: sysctl(%s) - size only", pathctl);
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if ((path = malloc(sz + 1)) == NULL) {
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errno = ENOMEM;
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err(1, "allocating %lu bytes for the path",
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(unsigned long)sz+1);
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}
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if (sysctl(mib, miblen, path, &sz, NULL, NULL) == -1)
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err(1, "getting path: sysctl(%s)", pathctl);
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modpath = path;
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}
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/* Set the module search path after changing it */
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static void
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setpath(struct pathhead *pathq)
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{
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char *newpath;
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if (miblen == 0)
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getmib();
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if ((newpath = qstring(pathq)) == NULL) {
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errno = ENOMEM;
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err(1, "building path string");
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}
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if (sysctl(mib, miblen, NULL, NULL, newpath, strlen(newpath)+1) == -1)
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err(1, "setting path: sysctl(%s)", pathctl);
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if (modpath != NULL)
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free(modpath);
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modpath = newpath;
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}
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/* Add/insert a new component to the module search path */
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static void
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addpath(struct pathhead *pathq, char *path, int force, int insert)
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{
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struct pathentry *pe, *pskip;
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char pathbuf[MAXPATHLEN+1];
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size_t len;
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static unsigned added = 0;
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unsigned i;
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/*
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* If the path exists, use it; otherwise, take the user-specified
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* path at face value - may be a removed directory.
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*/
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if (realpath(path, pathbuf) == NULL)
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strlcpy(pathbuf, path, sizeof(pathbuf));
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len = strlen(pathbuf);
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#ifdef NEED_SLASHTERM
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/* slash-terminate, because the kernel linker said so. */
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if ((len == 0) || (pathbuf[len-1] != '/')) {
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if (len == sizeof(pathbuf) - 1)
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errx(1, "path too long: %s", pathbuf);
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pathbuf[len] = '/';
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}
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#else /* NEED_SLASHTERM */
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/* remove a terminating slash if present */
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if ((len > 0) && (pathbuf[len-1] == '/'))
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pathbuf[--len] = '\0';
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#endif /* NEED_SLASHTERM */
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/* is it already in there? */
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TAILQ_FOREACH(pe, pathq, next)
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if (!strcmp(pe->path, pathbuf))
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break;
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if (pe != NULL) {
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if (force)
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return;
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errx(1, "already in the module search path: %s", pathbuf);
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}
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/* OK, allocate and add it. */
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if (((pe = malloc(sizeof(*pe))) == NULL) ||
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((pe->path = strdup(pathbuf)) == NULL)) {
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errno = ENOMEM;
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err(1, "allocating path component");
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}
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if (!insert) {
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TAILQ_INSERT_TAIL(pathq, pe, next);
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} else {
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for (i = 0, pskip = TAILQ_FIRST(pathq); i < added; i++)
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pskip = TAILQ_NEXT(pskip, next);
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if (pskip != NULL)
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TAILQ_INSERT_BEFORE(pskip, pe, next);
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else
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TAILQ_INSERT_TAIL(pathq, pe, next);
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added++;
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}
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changed = 1;
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}
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/* Remove a path component from the module search path */
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static void
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rempath(struct pathhead *pathq, char *path, int force, int insert __unused)
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{
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char pathbuf[MAXPATHLEN+1];
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struct pathentry *pe;
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size_t len;
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/* same logic as in addpath() */
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if (realpath(path, pathbuf) == NULL)
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strlcpy(pathbuf, path, sizeof(pathbuf));
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len = strlen(pathbuf);
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#ifdef NEED_SLASHTERM
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/* slash-terminate, because the kernel linker said so. */
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if ((len == 0) || (pathbuf[len-1] != '/')) {
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if (len == sizeof(pathbuf) - 1)
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errx(1, "path too long: %s", pathbuf);
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pathbuf[len] = '/';
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}
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#else /* NEED_SLASHTERM */
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/* remove a terminating slash if present */
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if ((len > 0) && (pathbuf[len-1] == '/'))
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pathbuf[--len] = '\0';
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#endif /* NEED_SLASHTERM */
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/* Is it in there? */
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TAILQ_FOREACH(pe, pathq, next)
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if (!strcmp(pe->path, pathbuf))
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break;
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if (pe == NULL) {
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if (force)
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return;
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errx(1, "not in module search path: %s", pathbuf);
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}
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/* OK, remove it now.. */
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TAILQ_REMOVE(pathq, pe, next);
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changed = 1;
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}
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/* Display the retrieved module search path */
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static void
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showpath(struct pathhead *pathq)
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{
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char *s;
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if ((s = qstring(pathq)) == NULL) {
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errno = ENOMEM;
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err(1, "building path string");
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}
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printf("%s\n", s);
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free(s);
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}
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/* Break a string down into path components, store them into a queue */
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static void
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parsepath(struct pathhead *pathq, char *path, int uniq)
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{
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char *p;
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struct pathentry *pe;
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while ((p = strsep(&path, ";")) != NULL)
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if (!uniq) {
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if (((pe = malloc(sizeof(pe))) == NULL) ||
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((pe->path = strdup(p)) == NULL)) {
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errno = ENOMEM;
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err(1, "allocating path element");
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}
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TAILQ_INSERT_TAIL(pathq, pe, next);
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} else {
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addpath(pathq, p, 1, 0);
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}
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}
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/* Recreate a path string from a components queue */
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static char *
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qstring(struct pathhead *pathq)
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{
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char *s, *p;
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struct pathentry *pe;
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s = strdup("");
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TAILQ_FOREACH(pe, pathq, next) {
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asprintf(&p, "%s%s%s",
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s, pe->path, (TAILQ_NEXT(pe, next) != NULL? ";": ""));
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free(s);
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if (p == NULL)
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return (NULL);
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s = p;
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}
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return (s);
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}
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/* Usage message */
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static void
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usage(void)
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{
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fprintf(stderr, "%s\n%s\n",
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"usage:\tkldconfig [-dfimnUv] [-S sysctlname] [path..]",
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"\tkldconfig -r");
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exit(1);
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}
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/* Main function */
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int
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main(int argc, char *argv[])
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{
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/* getopt() iterator */
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int c;
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/* iterator over argv[] path components */
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int i;
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/* Command-line flags: */
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/* "-f" - no diagnostic messages */
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int fflag;
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/* "-i" - insert before the first element */
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int iflag;
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/* "-m" - merge into the existing path, do not replace it */
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int mflag;
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/* "-n" - do not actually set the new module path */
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int nflag;
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/* "-r" - print out the current search path */
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int rflag;
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/* "-U" - remove duplicate values from the path */
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int uniqflag;
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/* "-v" - verbose operation (currently a no-op) */
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int vflag;
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/* The higher-level function to call - add/remove */
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void (*act)(struct pathhead *, char *, int, int);
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/* The original path */
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char *origpath;
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/* The module search path broken down into components */
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struct pathhead pathq;
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fflag = iflag = mflag = nflag = rflag = uniqflag = vflag = 0;
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act = addpath;
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origpath = NULL;
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if ((pathctl = strdup(PATHCTL)) == NULL) {
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/* this is just too paranoid ;) */
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errno = ENOMEM;
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err(1, "initializing sysctl name %s", PATHCTL);
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}
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/* If no arguments and no options are specified, force '-m' */
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if (argc == 1)
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mflag = 1;
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while ((c = getopt(argc, argv, "dfimnrS:Uv")) != -1)
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switch (c) {
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case 'd':
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if (iflag || mflag)
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usage();
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act = rempath;
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break;
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case 'f':
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fflag = 1;
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break;
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case 'i':
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if (act != addpath)
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usage();
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iflag = 1;
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break;
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case 'm':
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if (act != addpath)
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usage();
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mflag = 1;
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break;
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case 'n':
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nflag = 1;
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break;
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case 'r':
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rflag = 1;
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break;
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case 'S':
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free(pathctl);
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if ((pathctl = strdup(optarg)) == NULL) {
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errno = ENOMEM;
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err(1, "sysctl name %s", optarg);
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}
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break;
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case 'U':
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uniqflag = 1;
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break;
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case 'v':
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vflag++;
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break;
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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/* The '-r' flag cannot be used when paths are also specified */
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if (rflag && (argc > 0))
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usage();
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TAILQ_INIT(&pathq);
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/* Retrieve and store the path from the sysctl value */
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getpath();
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if ((origpath = strdup(modpath)) == NULL) {
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errno = ENOMEM;
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err(1, "saving the original search path");
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}
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/*
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* Break down the path into the components queue if:
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* - we are NOT adding paths, OR
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* - the 'merge' flag is specified, OR
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* - the 'print only' flag is specified, OR
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* - the 'unique' flag is specified.
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*/
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if ((act != addpath) || mflag || rflag || uniqflag)
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parsepath(&pathq, modpath, uniqflag);
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else if (modpath[0] != '\0')
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changed = 1;
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/* Process the path arguments */
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for (i = 0; i < argc; i++)
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act(&pathq, argv[i], fflag, iflag);
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if (changed && !nflag)
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setpath(&pathq);
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if (rflag || (changed && vflag)) {
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if (changed && (vflag > 1))
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printf("%s -> ", origpath);
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showpath(&pathq);
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}
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return (0);
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}
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