NetBSD/sbin/ldconfig/ldconfig.c

620 lines
14 KiB
C

/* $NetBSD: ldconfig.c,v 1.33 2001/02/19 22:56:20 cgd Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
* 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 the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/mman.h>
#include <a.out.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <link_aout.h>
#include <paths.h>
#include "shlib.h"
#define _PATH_LD_SO_CONF "/etc/ld.so.conf"
#undef major
#undef minor
static int verbose;
static int nostd;
static int noconf;
static int justread;
static int merge;
struct shlib_list {
/* Internal list of shared libraries found */
char *name;
char *path;
int dewey[MAXDEWEY];
int ndewey;
#define major dewey[0]
#define minor dewey[1]
struct shlib_list *next;
};
static struct shlib_list *shlib_head = NULL, **shlib_tail = &shlib_head;
static char *dir_list;
static void enter __P((char *, char *, char *, int *, int));
static int dodir __P((char *, int, int));
static int do_conf __P((void));
static int buildhints __P((void));
static int readhints __P((void));
static void listhints __P((void));
static int hinthash __P((char *, int, int));
int main __P((int, char *[]));
int
main(argc, argv)
int argc;
char *argv[];
{
int i, c;
int rval = 0;
while ((c = getopt(argc, argv, "cmrsSv")) != -1) {
switch (c) {
case 'c':
noconf = 1;
break;
case 'm':
merge = 1;
break;
case 'r':
justread = 1;
break;
case 's':
nostd = 1;
noconf = 1;
break;
case 'S':
nostd = 1;
break;
case 'v':
verbose = 1;
break;
default:
errx(1, "Usage: %s [-c][-m][-r][-s][-S][-v][dir ...]",
getprogname());
break;
}
}
dir_list = xmalloc(1);
*dir_list = '\0';
if (justread || merge) {
if ((rval = readhints()) != 0)
return (rval);
if (justread) {
listhints();
return (rval);
}
}
if (!nostd && !merge)
std_search_path();
for (i = 0; i < n_search_dirs; i++)
rval |= dodir(search_dirs[i], 1, 0);
if (!noconf && !merge)
rval |= do_conf();
for (i = optind; i < argc; i++) {
rval |= dodir(argv[i], 0, 1);
}
rval |= buildhints();
return (rval);
}
int
do_conf ()
{
FILE *conf;
char *line, *c;
char *cline = NULL;
size_t len;
int rval = 0;
#ifdef __ELF__
char *aout_conf;
aout_conf = xmalloc(sizeof(_PATH_EMUL_AOUT) +
strlen(_PATH_LD_SO_CONF));
strcpy(aout_conf, _PATH_EMUL_AOUT);
strcat(aout_conf, _PATH_LD_SO_CONF);
if ((conf = fopen(aout_conf, "r")) == NULL) {
if (verbose)
warnx("can't open `%s'", aout_conf);
return (0);
}
free(aout_conf);
#else
if ((conf = fopen(_PATH_LD_SO_CONF, "r")) == NULL) {
if (verbose) {
warnx("can't open `%s'", _PATH_LD_SO_CONF);
}
return (0);
}
#endif
while ((line = fgetln(conf, &len)) != NULL) {
if (*line != '/')
continue;
if (line[len-1] == '\n') {
line[--len] = '\0';
} else {
cline = xmalloc(len+1);
memcpy(cline, line, len);
line = cline;
line[len] = '\0';
}
while (isblank(*line)) { line++; len--; }
if ((c = strchr(line, '#')) == NULL)
c = line + len;
while (--c >= line && isblank(*c)) continue;
if (c >= line) {
*++c = '\0';
rval |= dodir(line, 0, 1);
}
if (cline) {
free(cline);
cline = NULL;
}
}
(void) fclose(conf);
return (rval);
}
int
dodir(dir, silent, update_dir_list)
char *dir;
int silent;
int update_dir_list;
{
DIR *dd;
struct dirent *dp;
char name[MAXPATHLEN];
int dewey[MAXDEWEY], ndewey;
if ((dd = opendir(dir)) == NULL) {
/* /emul/aout directories are allowed to not exist.
*/
if (!strncmp(dir, _PATH_EMUL_AOUT, sizeof(_PATH_EMUL_AOUT)-1))
return 0;
if (!silent || errno != ENOENT)
warn("%s", dir);
return (-1);
}
if (update_dir_list) {
/* Check for duplicates? */
char *cp = concat(dir_list, *dir_list?":":"", dir);
free(dir_list);
dir_list = cp;
}
while ((dp = readdir(dd)) != NULL) {
int n;
char *cp, *path;
FILE *fp;
struct exec ex;
/* Check for `lib' prefix */
if (dp->d_name[0] != 'l' ||
dp->d_name[1] != 'i' ||
dp->d_name[2] != 'b')
continue;
/* Copy the entry minus prefix */
(void)strcpy(name, dp->d_name + 3);
n = strlen(name);
if (n < 4)
continue;
/* Find ".so." in name */
for (cp = name + n - 4; cp > name; --cp) {
if (cp[0] == '.' &&
cp[1] == 's' &&
cp[2] == 'o' &&
cp[3] == '.')
break;
}
if (cp <= name)
continue;
path = concat(dir, "/", dp->d_name);
fp = fopen(path, "r");
free(path);
if (fp == NULL)
continue;
n = fread(&ex, 1, sizeof(ex), fp);
fclose(fp);
if (n != sizeof(ex)
|| N_GETMAGIC(ex) != ZMAGIC
|| (N_GETFLAG(ex) & EX_DYNAMIC) == 0)
continue;
*cp = '\0';
if (!isdigit(*(cp+4)))
continue;
memset(dewey, 0, sizeof(dewey));
ndewey = getdewey(dewey, cp + 4);
enter(dir, dp->d_name, name, dewey, ndewey);
}
(void) closedir(dd);
return (0);
}
static void
enter(dir, file, name, dewey, ndewey)
char *dir, *file, *name;
int dewey[], ndewey;
{
struct shlib_list *shp;
for (shp = shlib_head; shp; shp = shp->next) {
if (strcmp(name, shp->name) != 0 || major != shp->major)
continue;
/* Name matches existing entry */
if (cmpndewey(dewey, ndewey, shp->dewey, shp->ndewey) > 0) {
/* Update this entry with higher versioned lib */
if (verbose)
printf("Updating lib%s.%d.%d to %s/%s\n",
shp->name, shp->major, shp->minor,
dir, file);
free(shp->name);
shp->name = strdup(name);
free(shp->path);
shp->path = concat(dir, "/", file);
memcpy(shp->dewey, dewey, sizeof(shp->dewey));
shp->ndewey = ndewey;
}
break;
}
if (shp)
/* Name exists: older version or just updated */
return;
/* Allocate new list element */
if (verbose)
printf("Adding %s/%s\n", dir, file);
shp = (struct shlib_list *)xmalloc(sizeof *shp);
shp->name = strdup(name);
shp->path = concat(dir, "/", file);
memcpy(shp->dewey, dewey, MAXDEWEY);
shp->ndewey = ndewey;
shp->next = NULL;
*shlib_tail = shp;
shlib_tail = &shp->next;
}
#if DEBUG
/* test */
#undef _PATH_LD_HINTS
#define _PATH_LD_HINTS "./ld.so.hints"
#endif
/* XXX - should be a common function with rtld.c */
int
hinthash(cp, vmajor, vminor)
char *cp;
int vmajor, vminor;
{
int k = 0;
while (*cp)
k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
k = (((k << 1) + (k >> 14)) ^ (vmajor*257)) & 0x3fff;
#if 0
k = (((k << 1) + (k >> 14)) ^ (vminor*167)) & 0x3fff;
#endif
return (k);
}
int
buildhints()
{
struct hints_header hdr;
struct hints_bucket *blist;
struct shlib_list *shp;
char *strtab;
int i, n, str_index = 0;
int strtab_sz = 0; /* Total length of strings */
int nhints = 0; /* Total number of hints */
int fd;
char *tmpfile;
for (shp = shlib_head; shp; shp = shp->next) {
strtab_sz += 1 + strlen(shp->name);
strtab_sz += 1 + strlen(shp->path);
nhints++;
}
/* Fill hints file header */
hdr.hh_magic = HH_MAGIC;
hdr.hh_version = LD_HINTS_VERSION_2;
hdr.hh_nbucket = 1 * nhints;
n = hdr.hh_nbucket * sizeof(struct hints_bucket);
hdr.hh_hashtab = sizeof(struct hints_header);
hdr.hh_strtab = hdr.hh_hashtab + n;
hdr.hh_dirlist = strtab_sz;
strtab_sz += 1 + strlen(dir_list);
hdr.hh_strtab_sz = strtab_sz;
hdr.hh_ehints = hdr.hh_strtab + hdr.hh_strtab_sz;
if (verbose)
printf("Totals: entries %d, buckets %ld, string size %d\n",
nhints, hdr.hh_nbucket, strtab_sz);
/* Allocate buckets and string table */
blist = (struct hints_bucket *)xmalloc(n);
memset(blist, 0, n);
for (i = 0; i < hdr.hh_nbucket; i++)
/* Empty all buckets */
blist[i].hi_next = -1;
strtab = (char *)xmalloc(strtab_sz);
/* Enter all */
for (shp = shlib_head; shp; shp = shp->next) {
struct hints_bucket *bp;
bp = blist +
(hinthash(shp->name, shp->major, shp->minor) % hdr.hh_nbucket);
if (bp->hi_pathx) {
int i;
for (i = 0; i < hdr.hh_nbucket; i++) {
if (blist[i].hi_pathx == 0)
break;
}
if (i == hdr.hh_nbucket) {
warnx("Bummer!");
return (-1);
}
while (bp->hi_next != -1)
bp = &blist[bp->hi_next];
bp->hi_next = i;
bp = blist + i;
}
/* Insert strings in string table */
bp->hi_namex = str_index;
strcpy(strtab + str_index, shp->name);
str_index += 1 + strlen(shp->name);
bp->hi_pathx = str_index;
strcpy(strtab + str_index, shp->path);
str_index += 1 + strlen(shp->path);
/* Copy versions */
memcpy(bp->hi_dewey, shp->dewey, sizeof(bp->hi_dewey));
bp->hi_ndewey = shp->ndewey;
}
/* Copy search directories */
strcpy(strtab + str_index, dir_list);
str_index += 1 + strlen(dir_list);
/* Sanity check */
if (str_index != strtab_sz) {
errx(1, "str_index(%d) != strtab_sz(%d)", str_index, strtab_sz);
}
tmpfile = concat(_PATH_LD_HINTS, ".XXXXXX", "");
if ((fd = mkstemp(tmpfile)) == -1) {
warn("%s", tmpfile);
return (-1);
}
if (write(fd, &hdr, sizeof(struct hints_header)) !=
sizeof(struct hints_header)) {
warn("%s", _PATH_LD_HINTS);
return (-1);
}
if (write(fd, blist, hdr.hh_nbucket * sizeof(struct hints_bucket)) !=
hdr.hh_nbucket * sizeof(struct hints_bucket)) {
warn("%s", _PATH_LD_HINTS);
return (-1);
}
if (write(fd, strtab, strtab_sz) != strtab_sz) {
warn("%s", _PATH_LD_HINTS);
return (-1);
}
if (fchmod(fd, 0444) == -1) {
warn("%s", _PATH_LD_HINTS);
return (-1);
}
if (close(fd) != 0) {
warn("%s", _PATH_LD_HINTS);
return (-1);
}
/* Install it */
if (unlink(_PATH_LD_HINTS) != 0 && errno != ENOENT) {
warn("%s", _PATH_LD_HINTS);
return (-1);
}
if (rename(tmpfile, _PATH_LD_HINTS) != 0) {
warn("%s", _PATH_LD_HINTS);
return (-1);
}
return (0);
}
static int
readhints()
{
int fd;
void *addr = (void *) -1;
size_t msize;
struct hints_header *hdr;
struct hints_bucket *blist;
char *strtab;
struct shlib_list *shp;
int i;
struct stat st;
int error = 0;
if ((fd = open(_PATH_LD_HINTS, O_RDONLY, 0)) == -1) {
warn("%s", _PATH_LD_HINTS);
goto cleanup;
}
if (fstat(fd, &st) == -1) {
warn("%s", _PATH_LD_HINTS);
goto cleanup;
}
msize = (size_t)st.st_size;
if (msize < sizeof(*hdr)) {
warnx("%s: File too short", _PATH_LD_HINTS);
goto cleanup;
}
addr = mmap(0, msize, PROT_READ, MAP_FILE|MAP_PRIVATE, fd, 0);
if (addr == (void *)-1) {
warn("%s", _PATH_LD_HINTS);
goto cleanup;
}
hdr = (struct hints_header *)addr;
if (HH_BADMAG(*hdr)) {
warnx("%s: Bad magic: %lo",
_PATH_LD_HINTS, hdr->hh_magic);
goto cleanup;
}
if (hdr->hh_version != LD_HINTS_VERSION_2) {
warnx("Unsupported version: %ld", hdr->hh_version);
goto cleanup;
}
blist = (struct hints_bucket *)((char *)addr + hdr->hh_hashtab);
strtab = ((char *)addr + hdr->hh_strtab);
for (i = 0; i < hdr->hh_nbucket; i++) {
struct hints_bucket *bp = &blist[i];
/* Sanity check */
if (bp->hi_namex >= hdr->hh_strtab_sz) {
warnx("Bad name index: %#x", bp->hi_namex);
goto cleanup;
}
if (bp->hi_pathx >= hdr->hh_strtab_sz) {
warnx("Bad path index: %#x", bp->hi_pathx);
goto cleanup;
}
/* Allocate new list element */
shp = (struct shlib_list *)xmalloc(sizeof *shp);
shp->name = strdup(strtab + bp->hi_namex);
shp->path = strdup(strtab + bp->hi_pathx);
memcpy(shp->dewey, bp->hi_dewey, sizeof(shp->dewey));
shp->ndewey = bp->hi_ndewey;
shp->next = NULL;
*shlib_tail = shp;
shlib_tail = &shp->next;
}
dir_list = strdup(strtab + hdr->hh_dirlist);
goto done;
cleanup:
error = 1;
done:
if (fd != -1)
close(fd);
if (addr != (void *)-1)
munmap(addr, msize);
return error;
}
static void
listhints()
{
struct shlib_list *shp;
int i;
printf("%s:\n", _PATH_LD_HINTS);
printf("\tsearch directories: %s\n", dir_list);
for (i = 0, shp = shlib_head; shp; i++, shp = shp->next)
printf("\t%d:-l%s.%d.%d => %s\n",
i, shp->name, shp->major, shp->minor, shp->path);
return;
}