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/* $OpenBSD: sod.c,v 1.19 2003/10/26 23:23:12 drahn Exp $ */
/*
* Copyright (c) 1993 Paul Kranenburg
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Paul Kranenburg.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <sys/types.h>
#include <sys/syslimits.h>
#include <stdio.h>
#include <fcntl.h>
#include <nlist.h>
#include <link.h>
#include <limits.h>
#include <machine/exec.h>
#include <sys/mman.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <syscall.h>
#include "archdep.h"
#include "util.h"
#include "sod.h"
int _dl_hinthash(char *cp, int vmajor, int vminor);
void _dl_maphints(void);
/*
* Populate sod struct for dlopen's call to map_object
*/
void
_dl_build_sod(const char *name, struct sod *sodp)
{
unsigned int tuplet;
int major, minor;
char *realname, *tok, *etok, *cp;
/* default is an absolute or relative path */
sodp->sod_name = (long)_dl_strdup(name); /* strtok is destructive */
sodp->sod_library = 0;
sodp->sod_major = sodp->sod_minor = 0;
/* does it look like /^lib/ ? */
if (_dl_strncmp((char *)sodp->sod_name, "lib", 3) != 0)
return;
/* is this a filename? */
if (_dl_strchr((char *)sodp->sod_name, '/'))
return;
/* skip over 'lib' */
cp = (char *)sodp->sod_name + 3;
/* dot guardian */
if ((_dl_strchr(cp, '.') == NULL) || (*(cp+_dl_strlen(cp)-1) == '.'))
return;
/* default */
major = minor = -1;
realname = NULL;
/* loop through name - parse skipping name */
for (tuplet = 0; (tok = strsep(&cp, ".")) != NULL; tuplet++) {
switch (tuplet) {
case 0:
/* removed 'lib' and extensions from name */
realname = tok;
break;
case 1:
/* 'so' extension */
if (_dl_strcmp(tok, "so") != 0) {
/*
* filenames such as libX-A.B.so.X.Y
* screw this up, decrement tuplet
* and try to continue.
*/
tuplet--;
}
break;
case 2:
/* major version extension */
major = _dl_strtol(tok, &etok, 10);
if (*tok == '\0' || *etok != '\0')
goto backout;
break;
case 3:
/* minor version extension */
minor = _dl_strtol(tok, &etok, 10);
if (*tok == '\0' || *etok != '\0')
goto backout;
break;
/* if we get here, it must be weird */
default:
goto backout;
}
}
if (realname == NULL)
goto backout;
cp = (char *)sodp->sod_name;
sodp->sod_name = (long)_dl_strdup(realname);
_dl_free(cp);
sodp->sod_library = 1;
sodp->sod_major = major;
sodp->sod_minor = minor;
return;
backout:
_dl_free((char *)sodp->sod_name);
sodp->sod_name = (long)_dl_strdup(name);
}
static struct hints_header *hheader = NULL;
static struct hints_bucket *hbuckets;
static char *hstrtab;
char *_dl_hint_search_path = NULL;
#define HINTS_VALID (hheader != NULL && hheader != (struct hints_header *)-1)
void
_dl_maphints(void)
{
struct stat sb;
caddr_t addr = MAP_FAILED;
long hsize = 0;
int hfd;
if ((hfd = _dl_open(_PATH_LD_HINTS, O_RDONLY)) < 0)
goto bad_hints;
if (_dl_fstat(hfd, &sb) != 0 || !S_ISREG(sb.st_mode) ||
sb.st_size < sizeof(struct hints_header) || sb.st_size > LONG_MAX)
goto bad_hints;
hsize = (long)sb.st_size;
addr = (void *)_dl_mmap(0, hsize, PROT_READ, MAP_PRIVATE, hfd, 0);
if (addr == MAP_FAILED)
goto bad_hints;
hheader = (struct hints_header *)addr;
if (HH_BADMAG(*hheader) || hheader->hh_ehints > hsize)
goto bad_hints;
if (hheader->hh_version != LD_HINTS_VERSION_1 &&
hheader->hh_version != LD_HINTS_VERSION_2)
goto bad_hints;
hbuckets = (struct hints_bucket *)(addr + hheader->hh_hashtab);
hstrtab = (char *)(addr + hheader->hh_strtab);
if (hheader->hh_version >= LD_HINTS_VERSION_2)
_dl_hint_search_path = hstrtab + hheader->hh_dirlist;
/* close the file descriptor, leaving the hints mapped */
_dl_close(hfd);
return;
bad_hints:
if (addr != MAP_FAILED)
_dl_munmap(addr, hsize);
if (hfd != -1)
_dl_close(hfd);
hheader = (struct hints_header *)-1;
}
char *
_dl_findhint(char *name, int major, int minor, char *prefered_path)
{
struct hints_bucket *bp;
/*
* If not mapped, and we have not tried before, try to map the
* hints, if previous attempts failed hheader is -1 and we
* do not wish to retry it.
*/
if (hheader == NULL)
_dl_maphints();
/* if it failed to map, return failure */
if (!(HINTS_VALID))
return NULL;
bp = hbuckets + (_dl_hinthash(name, major, minor) % hheader->hh_nbucket);
while (1) {
/* Sanity check */
if (bp->hi_namex >= hheader->hh_strtab_sz) {
_dl_printf("Bad name index: %#x\n", bp->hi_namex);
_dl_exit(7);
break;
}
if (bp->hi_pathx >= hheader->hh_strtab_sz) {
_dl_printf("Bad path index: %#x\n", bp->hi_pathx);
_dl_exit(7);
break;
}
if (_dl_strcmp(name, hstrtab + bp->hi_namex) == 0) {
/* It's `name', check version numbers */
if (bp->hi_major == major &&
(bp->hi_ndewey < 2 || bp->hi_minor >= minor)) {
if (prefered_path == NULL ||
_dl_strncmp(prefered_path,
hstrtab + bp->hi_pathx,
_dl_strlen(prefered_path)) == 0)
return hstrtab + bp->hi_pathx;
}
}
if (bp->hi_next == -1)
break;
/* Move on to next in bucket */
bp = &hbuckets[bp->hi_next];
}
/* No hints available for name */
return NULL;
}
int
_dl_hinthash(char *cp, int vmajor, int vminor)
{
int k = 0;
while (*cp)
k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
k = (((k << 1) + (k >> 14)) ^ (vmajor*257)) & 0x3fff;
if (hheader->hh_version == LD_HINTS_VERSION_1)
k = (((k << 1) + (k >> 14)) ^ (vminor*167)) & 0x3fff;
return k;
}
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