420 lines
9.2 KiB
C
420 lines
9.2 KiB
C
/* $NetBSD: paths.c,v 1.8 1999/12/15 05:22:37 christos Exp $ */
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/*
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* Copyright 1996 Matt Thomas <matt@3am-software.com>
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.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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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/gmon.h>
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#include <sys/sysctl.h>
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#include <sys/socket.h>
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#include <sys/mount.h>
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#include <sys/mbuf.h>
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#include <sys/resource.h>
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#include <vm/vm_param.h>
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#include <machine/cpu.h>
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#include "debug.h"
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#include "rtld.h"
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static Search_Path *_rtld_find_path __P((Search_Path *, const char *, size_t));
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static Search_Path **_rtld_append_path __P((Search_Path **, Search_Path **,
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const char *, const char *, bool));
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static void _rtld_process_mapping __P((Library_Xform **, char *, bool));
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static Search_Path *
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_rtld_find_path(path, pathstr, pathlen)
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Search_Path *path;
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const char *pathstr;
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size_t pathlen;
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{
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for (; path != NULL; path = path->sp_next) {
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if (pathlen == path->sp_pathlen &&
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memcmp(path->sp_path, pathstr, pathlen) == 0)
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return path;
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}
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return NULL;
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}
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static Search_Path **
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_rtld_append_path(head_p, path_p, bp, ep, dodebug)
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Search_Path **head_p, **path_p;
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const char *bp;
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const char *ep;
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bool dodebug;
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{
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char *cp;
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Search_Path *path;
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if (bp == NULL || bp == ep || *bp == '\0')
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return path_p;
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if (_rtld_find_path(*head_p, bp, ep - bp) != NULL)
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return path_p;
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path = CNEW(Search_Path);
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path->sp_pathlen = ep - bp;
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cp = xmalloc(path->sp_pathlen + 1);
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strncpy(cp, bp, path->sp_pathlen);
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cp[path->sp_pathlen] = '\0';
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path->sp_path = cp;
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path->sp_next = (*path_p);
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(*path_p) = path;
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path_p = &path->sp_next;
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if (dodebug)
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dbg((" added path \"%s\"", path->sp_path));
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return path_p;
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}
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void
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_rtld_add_paths(path_p, pathstr, dodebug)
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Search_Path **path_p;
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const char *pathstr;
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bool dodebug;
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{
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Search_Path **head_p = path_p;
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if (pathstr == NULL)
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return;
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if (pathstr[0] == ':') {
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/*
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* Leading colon means append to current path
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*/
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while ((*path_p) != NULL)
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path_p = &(*path_p)->sp_next;
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pathstr++;
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}
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for (;;) {
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const char *bp = pathstr;
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const char *ep = strchr(bp, ':');
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if (ep == NULL)
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ep = &pathstr[strlen(pathstr)];
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path_p = _rtld_append_path(head_p, path_p, bp, ep, dodebug);
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if (ep[0] == '\0')
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break;
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pathstr = ep + 1;
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}
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}
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struct sysctldesc {
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const char *name;
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int type;
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};
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struct list {
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const struct sysctldesc *ctl;
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int numentries;
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};
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static struct sysctldesc ctl_machdep[] = CTL_MACHDEP_NAMES;
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static struct sysctldesc ctl_toplvl[] = CTL_NAMES;
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struct list toplevel[] = {
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{ 0, 0 },
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{ ctl_toplvl, CTL_MAXID },
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{ 0, -1 },
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};
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struct list secondlevel[] = {
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{ 0, 0 }, /* CTL_UNSPEC */
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{ 0, KERN_MAXID }, /* CTL_KERN */
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{ 0, VM_MAXID }, /* CTL_VM */
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{ 0, VFS_MAXID }, /* CTL_VFS */
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{ 0, NET_MAXID }, /* CTL_NET */
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{ 0, CTL_DEBUG_MAXID }, /* CTL_DEBUG */
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{ 0, HW_MAXID }, /* CTL_HW */
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#ifdef CTL_MACHDEP_NAMES
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{ ctl_machdep, CPU_MAXID }, /* CTL_MACHDEP */
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#else
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{ 0, 0 }, /* CTL_MACHDEP */
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#endif
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{ 0, USER_MAXID }, /* CTL_USER_NAMES */
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{ 0, DDBCTL_MAXID }, /* CTL_DDB_NAMES */
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{ 0, 2 }, /* dummy name */
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{ 0, -1 },
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};
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struct list *lists[] = {
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toplevel,
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secondlevel,
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0
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};
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#define CTL_MACHDEP_SIZE (sizeof(ctl_machdep) / sizeof(ctl_machdep[0]))
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/*
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* Process library mappings of the form:
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* <library_name> <machdep_variable> <value,...:library_name,...> ...
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*/
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static void
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_rtld_process_mapping(lib_p, bp, dodebug)
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Library_Xform **lib_p;
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char *bp;
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bool dodebug;
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{
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static const char WS[] = " \t\n";
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Library_Xform *hwptr = NULL;
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char *ptr, *key, *lib, *l;
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int i, j, k;
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if (dodebug)
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dbg((" processing mapping \"%s\"", bp));
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if ((ptr = strsep(&bp, WS)) == NULL)
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return;
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if (dodebug)
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dbg((" library \"%s\"", ptr));
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hwptr = xmalloc(sizeof(*hwptr));
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memset(hwptr, 0, sizeof(*hwptr));
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hwptr->name = xstrdup(ptr);
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if ((ptr = strsep(&bp, WS)) == NULL) {
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warnx("missing sysctl variable name");
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goto cleanup;
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}
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if (dodebug)
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dbg((" sysctl \"%s\"", ptr));
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for (i = 0; (l = strsep(&ptr, ".")) != NULL; i++) {
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if (lists[i] == NULL || i >= RTLD_MAX_CTL) {
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warnx("sysctl nesting too deep");
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goto cleanup;
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}
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for (j = 1; lists[i][j].numentries != -1; j++) {
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if (lists[i][j].ctl == NULL)
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continue;
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for (k = 1; k < lists[i][j].numentries; k++) {
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if (strcmp(lists[i][j].ctl[k].name, l) == 0)
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break;
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}
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if (lists[i][j].numentries == -1) {
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warnx("unknown sysctl variable name `%s'", l);
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goto cleanup;
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}
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hwptr->ctl[hwptr->ctlmax] = k;
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hwptr->ctltype[hwptr->ctlmax++] =
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lists[i][j].ctl[k].type;
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}
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}
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if (dodebug)
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for (i = 0; i < hwptr->ctlmax; i++)
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dbg((" sysctl %d, %d", hwptr->ctl[i],
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hwptr->ctltype[i]));
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for (i = 0; (ptr = strsep(&bp, WS)) != NULL; i++) {
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if (i == RTLD_MAX_ENTRY) {
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no_more:
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warnx("maximum library entries exceeded `%s'",
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hwptr->name);
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goto cleanup;
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}
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if ((key = strsep(&ptr, ":")) == NULL) {
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warnx("missing sysctl variable value for `%s'",
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hwptr->name);
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goto cleanup;
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}
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if ((lib = strsep(&ptr, ":")) == NULL) {
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warnx("missing sysctl library list for `%s'",
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hwptr->name);
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goto cleanup;
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}
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for (j = 0; (l = strsep(&lib, ",")) != NULL; j++) {
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if (j == RTLD_MAX_LIBRARY) {
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warnx("maximum library entries exceeded `%s'",
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hwptr->name);
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goto cleanup;
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}
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if (dodebug)
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dbg((" library \"%s\"", l));
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hwptr->entry[i].library[j] = xstrdup(l);
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}
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if (j == 0) {
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warnx("No library map entries for `%s/%s'",
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hwptr->name, ptr);
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goto cleanup;
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}
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j = i;
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for (; (l = strsep(&key, ",")) != NULL; i++) {
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if (dodebug)
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dbg((" key \"%s\"", l));
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if (i == RTLD_MAX_ENTRY)
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goto no_more;
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if (i != j)
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(void)memcpy(hwptr->entry[i].library,
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hwptr->entry[j].library,
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sizeof(hwptr->entry[j].library));
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hwptr->entry[i].value = xstrdup(l);
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}
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if (j != i)
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i--;
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}
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if (i == 0) {
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warnx("No library entries for `%s'", hwptr->name);
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goto cleanup;
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}
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hwptr->next = NULL;
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if (*lib_p != NULL)
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(*lib_p)->next = hwptr;
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*lib_p = hwptr;
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return;
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cleanup:
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if (hwptr->name)
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free(hwptr->name);
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free(hwptr);
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}
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void
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_rtld_process_hints(path_p, lib_p, fname, dodebug)
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Search_Path **path_p;
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Library_Xform **lib_p;
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const char *fname;
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bool dodebug;
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{
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int fd;
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char *p, *buf, *b, *ebuf;
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struct stat st;
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size_t sz;
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Search_Path **head_p = path_p;
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int doing_path = 0;
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if ((fd = open(fname, O_RDONLY)) == -1) {
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/* Don't complain */
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return;
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}
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if (fstat(fd, &st) == -1) {
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/* Complain */
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xwarn("fstat: %s", fname);
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return;
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}
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sz = (size_t) st.st_size;
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buf = mmap(0, sz, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FILE, fd, 0);
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if (buf == MAP_FAILED) {
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xwarn("fstat: %s", fname);
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(void)close(fd);
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return;
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}
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(void)close(fd);
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while ((*path_p) != NULL)
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path_p = &(*path_p)->sp_next;
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for (b = NULL, p = buf, ebuf = buf + sz; p < ebuf; p++) {
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if ((p == buf || p[-1] == '\0') && b == NULL)
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b = p;
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switch (*p) {
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case '/':
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if (b == p)
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doing_path = 1;
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break;
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case ' ': case '\t':
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if (b == p)
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b++;
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break;
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case '\n':
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*p = '\0';
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if (doing_path)
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path_p = _rtld_append_path(head_p, path_p, b, p,
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dodebug);
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else
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_rtld_process_mapping(lib_p, b, dodebug);
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b = NULL;
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break;
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case '#':
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if (b != p) {
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char *sp;
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for (sp = p - 1; *sp == ' ' ||
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*sp == '\t'; --sp)
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continue;
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*++sp = '\0';
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if (doing_path)
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path_p = _rtld_append_path(head_p,
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path_p, b, sp, dodebug);
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else
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_rtld_process_mapping(lib_p, b,
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dodebug);
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*sp = ' ';
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}
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b = NULL;
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break;
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default:
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if (b == p)
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doing_path = 0;
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break;
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}
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}
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if (doing_path)
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path_p = _rtld_append_path(head_p, path_p, b, ebuf, dodebug);
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else
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_rtld_process_mapping(lib_p, b, dodebug);
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(void)munmap(buf, sz);
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}
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