NetBSD/libexec/ld.elf_so/paths.c

371 lines
8.5 KiB
C

/* $NetBSD: paths.c,v 1.27 2003/07/24 10:12:26 skrll 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 <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>
#include <sys/mbuf.h>
#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 *, size_t);
static void _rtld_process_mapping(Library_Xform **, char *, size_t);
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 *bp, size_t len)
{
char *cp;
Search_Path *path;
if (_rtld_find_path(*head_p, bp, len) != NULL)
return path_p;
path = NEW(Search_Path);
path->sp_pathlen = len;
cp = xmalloc(len + 1);
memcpy(cp, bp, len);
cp[len] = '\0';
path->sp_path = cp;
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(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, bp, ep - bp);
if (ep[0] == '\0')
break;
pathstr = ep + 1;
}
}
struct sysctldesc {
const char *name;
int type;
};
struct list {
const struct sysctldesc *ctl;
int numentries;
};
#ifdef CTL_MACHDEP_NAMES
static const struct sysctldesc ctl_machdep[] = CTL_MACHDEP_NAMES;
#endif
static const struct sysctldesc ctl_toplvl[] = CTL_NAMES;
const struct list toplevel[] = {
{ 0, 0 },
{ ctl_toplvl, CTL_MAXID },
{ 0, -1 },
};
const struct list secondlevel[] = {
{ 0, 0 }, /* CTL_UNSPEC */
{ 0, KERN_MAXID }, /* CTL_KERN */
{ 0, VM_MAXID }, /* CTL_VM */
{ 0, VFS_MAXID }, /* CTL_VFS */
{ 0, NET_MAXID }, /* CTL_NET */
{ 0, CTL_DEBUG_MAXID }, /* CTL_DEBUG */
{ 0, HW_MAXID }, /* CTL_HW */
#ifdef CTL_MACHDEP_NAMES
{ ctl_machdep, CPU_MAXID }, /* CTL_MACHDEP */
#else
{ 0, 0 }, /* CTL_MACHDEP */
#endif
{ 0, USER_MAXID }, /* CTL_USER_NAMES */
{ 0, DDBCTL_MAXID }, /* CTL_DDB_NAMES */
{ 0, 2 }, /* dummy name */
{ 0, -1 },
};
const struct list *lists[] = {
toplevel,
secondlevel,
0
};
#define CTL_MACHDEP_SIZE (sizeof(ctl_machdep) / sizeof(ctl_machdep[0]))
/*
* Process library mappings of the form:
* <library_name> <machdep_variable> <value,...:library_name,...> ...
*/
static void
_rtld_process_mapping(Library_Xform **lib_p, char *bp, size_t len)
{
static const char WS[] = " \t\n";
Library_Xform *hwptr = NULL;
char *ptr, *key, *lib, *l;
int i, j, k;
dbg((" processing mapping \"%s\"", bp));
if ((ptr = strsep(&bp, WS)) == NULL)
return;
dbg((" library \"%s\"", ptr));
hwptr = xmalloc(sizeof(*hwptr));
memset(hwptr, 0, sizeof(*hwptr));
hwptr->name = xstrdup(ptr);
while ((ptr = strsep(&bp, WS)) != NULL)
if (*ptr != '\0')
break;
if (ptr == NULL) {
xwarnx("missing sysctl variable name");
goto cleanup;
}
dbg((" sysctl \"%s\"", ptr));
for (i = 0; (l = strsep(&ptr, ".")) != NULL; i++) {
if (lists[i] == NULL || i >= RTLD_MAX_CTL) {
xwarnx("sysctl nesting too deep");
goto cleanup;
}
for (j = 1; lists[i][j].numentries != -1; j++) {
if (lists[i][j].ctl == NULL)
continue;
for (k = 1; k < lists[i][j].numentries; k++) {
if (strcmp(lists[i][j].ctl[k].name, l) == 0)
break;
}
if (lists[i][j].numentries == -1) {
xwarnx("unknown sysctl variable name `%s'", l);
goto cleanup;
}
hwptr->ctl[hwptr->ctlmax] = k;
hwptr->ctltype[hwptr->ctlmax++] =
lists[i][j].ctl[k].type;
}
}
for (i = 0; i < hwptr->ctlmax; i++)
dbg((" sysctl %d, %d", hwptr->ctl[i], hwptr->ctltype[i]));
for (i = 0; (ptr = strsep(&bp, WS)) != NULL; i++) {
if (*ptr == '\0') {
/* back up index and continue */
i--;
continue;
}
if (i == RTLD_MAX_ENTRY) {
no_more:
xwarnx("maximum library entries exceeded `%s'",
hwptr->name);
goto cleanup;
}
if ((key = strsep(&ptr, ":")) == NULL) {
xwarnx("missing sysctl variable value for `%s'",
hwptr->name);
goto cleanup;
}
if ((lib = strsep(&ptr, ":")) == NULL) {
xwarnx("missing sysctl library list for `%s'",
hwptr->name);
goto cleanup;
}
for (j = 0; (l = strsep(&lib, ",")) != NULL; j++) {
if (j == RTLD_MAX_LIBRARY) {
xwarnx("maximum library entries exceeded `%s'",
hwptr->name);
goto cleanup;
}
dbg((" library \"%s\"", l));
hwptr->entry[i].library[j] = xstrdup(l);
}
if (j == 0) {
xwarnx("No library map entries for `%s/%s'",
hwptr->name, ptr);
goto cleanup;
}
j = i;
for (; (l = strsep(&key, ",")) != NULL; i++) {
dbg((" key \"%s\"", 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 = xstrdup(l);
}
if (j != i)
i--;
}
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)
free(hwptr->name);
free(hwptr);
}
void
_rtld_process_hints(Search_Path **path_p, Library_Xform **lib_p, const char *fname)
{
int fd;
char *buf, *b, *ebuf;
struct stat st;
size_t sz, len;
Search_Path **head_p = path_p;
int doing_path = 0;
if ((fd = open(fname, O_RDONLY)) == -1) {
/* Don't complain */
return;
}
if (fstat(fd, &st) == -1) {
/* Complain */
xwarn("fstat: %s", fname);
return;
}
sz = (size_t) st.st_size;
buf = mmap(0, sz, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FILE, fd, 0);
if (buf == MAP_FAILED) {
xwarn("fstat: %s", fname);
(void)close(fd);
return;
}
(void)close(fd);
while ((*path_p) != NULL)
path_p = &(*path_p)->sp_next;
for (b = buf, ebuf = buf + sz; b < ebuf; ) {
b += strspn(b, " \t\n");
if (*b == '\0')
break;
len = strcspn(b, "\n#");
if (len == 0) {
b += strcspn(b, "\n");
continue;
}
doing_path = *b == '/';
if (doing_path) {
size_t tmp = len - 1;
while (b[tmp] == '#' || b[tmp] == ' ' || b[tmp] == '\t')
tmp--;
path_p = _rtld_append_path(head_p, path_p, b, tmp + 1);
} else {
char tmp = b[len];
b[len] = '\0';
_rtld_process_mapping(lib_p, b, len);
b[len] = tmp;
}
b += len;
}
(void)munmap(buf, sz);
}