minix/libexec/ld.elf_so/paths.c
Lionel Sambuc f14fb60209 Libraries updates and cleanup
* Updating common/lib
 * Updating lib/csu
 * Updating lib/libc
 * Updating libexec/ld.elf_so
 * Corrected test on __minix in featuretest to actually follow the
   meaning of the comment.
 * Cleaned up _REENTRANT-related defintions.
 * Disabled -D_REENTRANT for libfetch
 * Removing some unneeded __NBSD_LIBC defines and tests

Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
2013-01-14 11:36:26 +01:00

496 lines
11 KiB
C

/* $NetBSD: paths.c,v 1.40 2009/05/19 20:44:52 christos Exp $ */
/*
* Copyright 1996 Matt Thomas <matt@3am-software.com>
* Copyright 2002 Charles M. Hannum <root@ihack.net>
* 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. 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/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: paths.c,v 1.40 2009/05/19 20:44:52 christos Exp $");
#endif /* not lint */
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/gmon.h>
#include <sys/socket.h>
#include <sys/mount.h>
#ifndef __minix
#include <sys/mbuf.h>
#endif
#include <sys/resource.h>
#include <machine/cpu.h>
#include "debug.h"
#include "rtld.h"
static Search_Path *_rtld_find_path(Search_Path *, const char *, size_t);
static Search_Path **_rtld_append_path(Search_Path **, Search_Path **,
const char *, const char *, const char *);
#if !defined(__minix)
static void _rtld_process_mapping(Library_Xform **, const char *,
const char *);
#endif /* !defined(__minix) */
static char *exstrdup(const char *, const char *);
#if !defined(__minix)
static const char *getstr(const char **, const char *, const char *);
static const char *getcstr(const char **, const char *, const char *);
static const char *getword(const char **, const char *, const char *);
static int matchstr(const char *, const char *, const char *);
#endif /* !defined(__minix) */
static const char WS[] = " \t\n";
/*
* Like xstrdup(), but takes end of string as a argument.
*/
static char *
exstrdup(const char *bp, const char *ep)
{
char *cp;
size_t len = ep - bp;
cp = xmalloc(len + 1);
memcpy(cp, bp, len);
cp[len] = '\0';
return (cp);
}
#if !defined(__minix)
/*
* Like strsep(), but takes end of string and doesn't put any NUL. To
* detect empty string, compare `*p' and return value.
*/
static const char *
getstr(const char **p, const char *ep, const char *delim)
{
const char *cp = *p, *q, *r;
if (ep < cp)
/* End of string */
return (NULL);
for (q = cp; q < ep; q++)
for (r = delim; *r != 0; r++)
if (*r == *q)
goto done;
done:
*p = q;
return (cp);
}
/*
* Like getstr() above, but delim[] is complemented.
*/
static const char *
getcstr(const char **p, const char *ep, const char *delim)
{
const char *cp = *p, *q, *r;
if (ep < cp)
/* End of string */
return (NULL);
for (q = cp; q < ep; q++)
for (r = delim; *r != *q; r++)
if (*r == 0)
goto done;
done:
*p = q;
return (cp);
}
static const char *
getword(const char **p, const char *ep, const char *delim)
{
(void)getcstr(p, ep, delim);
/*
* Now, we're looking non-delim, or end of string.
*/
return (getstr(p, ep, delim));
}
/*
* Match `bp' against NUL terminated string pointed by `p'.
*/
static int
matchstr(const char *p, const char *bp, const char *ep)
{
int c;
while (bp < ep)
if ((c = *p++) == 0 || c != *bp++)
return (0);
return (*p == 0);
}
#endif /* !defined(__minix) */
static Search_Path *
_rtld_find_path(Search_Path *path, const char *pathstr, size_t pathlen)
{
for (; path != NULL; path = path->sp_next) {
if (pathlen == path->sp_pathlen &&
memcmp(path->sp_path, pathstr, pathlen) == 0)
return path;
}
return NULL;
}
static Search_Path **
_rtld_append_path(Search_Path **head_p, Search_Path **path_p,
const char *execname, const char *bp, const char *ep)
{
Search_Path *path;
char epath[MAXPATHLEN];
size_t len;
len = _rtld_expand_path(epath, sizeof(epath), execname, bp, ep);
if (len == 0)
return path_p;
if (_rtld_find_path(*head_p, bp, ep - bp) != NULL)
return path_p;
path = NEW(Search_Path);
path->sp_pathlen = len;
path->sp_path = exstrdup(epath, epath + len);
path->sp_next = (*path_p);
(*path_p) = path;
path_p = &path->sp_next;
dbg((" added path \"%s\"", path->sp_path));
return path_p;
}
void
_rtld_add_paths(const char *execname, Search_Path **path_p, const char *pathstr)
{
Search_Path **head_p = path_p;
if (pathstr == NULL)
return;
if (pathstr[0] == ':') {
/*
* Leading colon means append to current path
*/
while ((*path_p) != NULL)
path_p = &(*path_p)->sp_next;
pathstr++;
}
for (;;) {
const char *bp = pathstr;
const char *ep = strchr(bp, ':');
if (ep == NULL)
ep = &pathstr[strlen(pathstr)];
path_p = _rtld_append_path(head_p, path_p, execname, bp, ep);
if (ep[0] == '\0')
break;
pathstr = ep + 1;
}
}
#if !defined(__minix)
/*
* Process library mappings of the form:
* <library_name> <machdep_variable> <value,...:library_name,...> ...
*/
static void
_rtld_process_mapping(Library_Xform **lib_p, const char *bp, const char *ep)
{
Library_Xform *hwptr = NULL;
const char *ptr, *key, *ekey, *lib, *elib, *l;
int i, j;
dbg((" processing mapping \"%.*s\"", (int)(ep - bp), bp));
if ((ptr = getword(&bp, ep, WS)) == NULL || ptr == bp)
return;
dbg((" library \"%.*s\"", (int)(bp - ptr), ptr));
hwptr = xmalloc(sizeof(*hwptr));
memset(hwptr, 0, sizeof(*hwptr));
hwptr->name = exstrdup(ptr, bp);
bp++;
if ((ptr = getword(&bp, ep, WS)) == NULL || ptr == bp) {
xwarnx("missing sysctl variable name");
goto cleanup;
}
dbg((" sysctl \"%.*s\"", (int)(bp - ptr), ptr));
hwptr->ctlname = exstrdup(ptr, bp);
for (i = 0; bp++, (ptr = getword(&bp, ep, WS)) != NULL;) {
dbg((" ptr = %.*s", (int)(bp - ptr), ptr));
if (ptr == bp)
continue;
if (i == RTLD_MAX_ENTRY) {
no_more:
xwarnx("maximum library entries exceeded `%s'",
hwptr->name);
goto cleanup;
}
if ((key = getstr(&ptr, bp, ":")) == NULL) {
xwarnx("missing sysctl variable value for `%s'",
hwptr->name);
goto cleanup;
}
ekey = ptr++;
if ((lib = getstr(&ptr, bp, ":")) == NULL) {
xwarnx("missing sysctl library list for `%s'",
hwptr->name);
goto cleanup;
}
elib = ptr; /* No need to advance */
for (j = 0; (l = getstr(&lib, elib, ",")) != NULL;
j++, lib++) {
if (j == RTLD_MAX_LIBRARY) {
xwarnx("maximum library entries exceeded `%s'",
hwptr->name);
goto cleanup;
}
dbg((" library \"%.*s\"", (int)(lib - l), l));
hwptr->entry[i].library[j] = exstrdup(l, lib);
}
if (j == 0) {
xwarnx("No library map entries for `%s/%.*s'",
hwptr->name, (int)(bp - ptr), ptr);
goto cleanup;
}
j = i;
for (; (l = getstr(&key, ekey, ",")) != NULL; i++, key++) {
/*
* Allow empty key (it is valid as string
* value). Thus, we loop at least once and
* `i' is incremented.
*/
dbg((" key \"%.*s\"", (int)(key - l), l));
if (i == RTLD_MAX_ENTRY)
goto no_more;
if (i != j)
(void)memcpy(hwptr->entry[i].library,
hwptr->entry[j].library,
sizeof(hwptr->entry[j].library));
hwptr->entry[i].value = exstrdup(l, key);
}
}
if (i == 0) {
xwarnx("No library entries for `%s'", hwptr->name);
goto cleanup;
}
hwptr->next = *lib_p;
*lib_p = hwptr;
return;
cleanup:
if (hwptr->name)
xfree(hwptr->name);
xfree(hwptr);
}
#endif /* !defined(__minix) */
void
_rtld_process_hints(const char *execname, Search_Path **path_p,
Library_Xform **lib_p, const char *fname)
{
#ifdef __minix
/* Minix doesn't support MAP_SHARED. */
return;
#else
int fd;
char *buf, small[128];
const char *b, *ep, *ptr;
struct stat st;
ssize_t sz;
Search_Path **head_p = path_p;
if ((fd = open(fname, O_RDONLY)) == -1) {
/* Don't complain */
return;
}
/* Try to avoid mmap/stat on the file. */
buf = small;
buf[0] = '\0';
sz = read(fd, buf, sizeof(small));
if (sz == -1) {
xwarn("read: %s", fname);
(void)close(fd);
return;
}
if (sz >= (ssize_t)sizeof(small)) {
if (fstat(fd, &st) == -1) {
/* Complain */
xwarn("fstat: %s", fname);
(void)close(fd);
return;
}
sz = (ssize_t) st.st_size;
buf = mmap(0, sz, PROT_READ, MAP_SHARED|MAP_FILE, fd, 0);
if (buf == MAP_FAILED) {
xwarn("mmap: %s", fname);
(void)close(fd);
return;
}
}
(void)close(fd);
while ((*path_p) != NULL)
path_p = &(*path_p)->sp_next;
for (b = buf, ep = buf + sz; b < ep; b++) {
(void)getcstr(&b, ep, WS);
if (b == ep)
break;
ptr = getstr(&b, ep, "\n#");
if (*ptr == '/') {
/*
* Since '/' != '\n' and != '#', we know ptr <
* b. And we will stop when b[-1] == '/'.
*/
while (b[-1] == ' ' || b[-1] == '\t')
b--;
path_p = _rtld_append_path(head_p, path_p, execname,
ptr, b);
} else
_rtld_process_mapping(lib_p, ptr, b);
/*
* b points one of ' ', \t, \n, # or equal to ep. So,
* make sure we are at newline or end of string.
*/
(void)getstr(&b, ep, "\n");
}
if (buf != small)
(void)munmap(buf, sz);
#endif
}
#ifndef __minix
/* Basic name -> sysctl MIB translation */
int
_rtld_sysctl(const char *name, void *oldp, size_t *oldlen)
{
const char *node, *ep;
struct sysctlnode query, *result, *newresult;
int mib[CTL_MAXNAME], r;
size_t res_size, n, i;
u_int miblen = 0;
/* Start with 16 entries, will grow it up as needed. */
res_size = 16 * sizeof(struct sysctlnode);
result = xmalloc(res_size);
if (result == NULL)
return (-1);
ep = name + strlen(name);
do {
i = ~0ul;
while (*name == '/' || *name == '.')
name++;
if (name >= ep)
break;
mib[miblen] = CTL_QUERY;
memset(&query, 0, sizeof(query));
query.sysctl_flags = SYSCTL_VERSION;
n = res_size;
if (sysctl(mib, miblen + 1, result, &n, &query,
sizeof(query)) == -1) {
if (errno != ENOMEM)
goto bad;
/* Grow up result */
res_size = n;
newresult = xrealloc(result, res_size);
if (newresult == NULL)
goto bad;
result = newresult;
if (sysctl(mib, miblen + 1, result, &n, &query,
sizeof(query)) == -1)
goto bad;
}
n /= sizeof(struct sysctlnode);
node = getstr(&name, ep, "./");
for (i = 0; i < n; i++)
if (matchstr(result[i].sysctl_name, node, name)) {
mib[miblen] = result[i].sysctl_num;
miblen++;
break;
}
} while (name < ep && miblen <= CTL_MAXNAME);
if (name < ep || i == ~0ul)
goto bad;
r = SYSCTL_TYPE(result[i].sysctl_flags);
xfree(result);
if (sysctl(mib, miblen, oldp, oldlen, NULL, 0) == -1)
return (-1);
return r;
bad:
xfree(result);
return (-1);
}
#endif