377 lines
8.5 KiB
C
377 lines
8.5 KiB
C
/*
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* Copyright (c) 2000, Boris Popov
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Boris Popov.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: subr.c,v 1.12 2001/08/22 03:31:37 bp Exp $
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*/
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <sys/sysctl.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <err.h>
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#include <netsmb/netbios.h>
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#include <netsmb/smb_lib.h>
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#include <netsmb/nb_lib.h>
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#include <cflib.h>
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#ifdef APPLE
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#include <sysexits.h>
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#include <sys/wait.h>
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#include <mach/mach.h>
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#include <mach/mach_error.h>
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uid_t real_uid, eff_uid;
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#endif
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extern char *__progname;
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static int smblib_initialized;
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struct rcfile *smb_rc;
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int
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smb_lib_init(void)
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{
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int error;
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int kv;
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size_t kvlen = sizeof(kv);
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if (smblib_initialized)
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return 0;
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#if __FreeBSD_version > 400000
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error = sysctlbyname("net.smb.version", &kv, &kvlen, NULL, 0);
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if (error) {
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warnx("%s: can't find kernel module\n", __FUNCTION__);
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return error;
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}
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if (NSMB_VERSION != kv) {
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warnx("%s: kernel module version(%d) don't match library(%d).\n", __FUNCTION__, kv, NSMB_VERSION);
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return EINVAL;
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}
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#endif
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if ((error = nls_setlocale("")) != 0) {
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warnx("%s: can't initialise locale\n", __FUNCTION__);
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return error;
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}
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smblib_initialized++;
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return 0;
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}
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/*
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* Print a (descriptive) error message
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* error values:
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* 0 - no specific error code available;
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* 1..32767 - system error
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*/
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void
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smb_error(const char *fmt, int error,...) {
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va_list ap;
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const char *cp;
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int errtype = error & SMB_ERRTYPE_MASK;
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fprintf(stderr, "%s: ", __progname);
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va_start(ap, error);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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if (error == -1)
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error = errno;
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else
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error &= ~SMB_ERRTYPE_MASK;
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switch (errtype) {
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case SMB_SYS_ERROR:
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if (error)
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fprintf(stderr, ": syserr = %s\n", strerror(error));
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else
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fprintf(stderr, "\n");
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break;
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case SMB_RAP_ERROR:
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fprintf(stderr, ": raperr = %d (0x%04x)\n", error, error);
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break;
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case SMB_NB_ERROR:
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cp = nb_strerror(error);
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if (cp == NULL)
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fprintf(stderr, ": nberr = unknown (0x%04x)\n", error);
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else
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fprintf(stderr, ": nberr = %s\n", cp);
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break;
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default:
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fprintf(stderr, "\n");
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}
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}
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char *
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smb_printb(char *dest, int flags, const struct smb_bitname *bnp) {
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int first = 1;
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strcpy(dest, "<");
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for(; bnp->bn_bit; bnp++) {
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if (flags & bnp->bn_bit) {
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strcat(dest, bnp->bn_name);
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first = 0;
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}
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if (!first && (flags & bnp[1].bn_bit))
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strcat(dest, "|");
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}
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strcat(dest, ">");
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return dest;
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}
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/*
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* first read ~/.smbrc, next try to merge SMB_CFG_FILE
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*/
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int
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smb_open_rcfile(void)
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{
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char *home, *fn;
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int error;
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home = getenv("HOME");
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if (home) {
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fn = malloc(strlen(home) + 20);
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sprintf(fn, "%s/.nsmbrc", home);
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error = rc_open(fn, "r", &smb_rc);
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free(fn);
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}
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error = rc_merge(SMB_CFG_FILE, &smb_rc);
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if (smb_rc == NULL) {
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printf("Warning: no cfg file(s) found.\n");
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return ENOENT;
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}
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return 0;
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}
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void *
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smb_dumptree(void)
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{
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size_t len;
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void *p;
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int error;
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#ifdef APPLE
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seteuid(eff_uid); /* restore setuid root briefly */
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#endif
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error = sysctlbyname("net.smb.treedump", NULL, &len, NULL, 0);
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#ifdef APPLE
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seteuid(real_uid); /* and back to real user */
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#endif
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if (error)
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return NULL;
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p = malloc(len);
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if (p == NULL)
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return NULL;
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#ifdef APPLE
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seteuid(eff_uid); /* restore setuid root briefly */
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#endif
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error = sysctlbyname("net.smb.treedump", p, &len, NULL, 0);
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#ifdef APPLE
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seteuid(real_uid); /* and back to real user */
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#endif
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if (error) {
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free(p);
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return NULL;
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}
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return p;
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}
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char *
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smb_simplecrypt(char *dst, const char *src)
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{
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int ch, pos;
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char *dp;
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if (dst == NULL) {
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dst = malloc(4 + 2 * strlen(src));
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if (dst == NULL)
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return NULL;
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}
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dp = dst;
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*dst++ = '$';
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*dst++ = '$';
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*dst++ = '1';
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pos = 27;
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while (*src) {
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ch = *src++;
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if (isascii(ch))
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ch = (isupper(ch) ? ('A' + (ch - 'A' + 13) % 26) :
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islower(ch) ? ('a' + (ch - 'a' + 13) % 26) : ch);
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ch ^= pos;
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pos += 13;
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sprintf(dst, "%02x", ch);
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dst += 2;
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}
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*dst = 0;
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return dp;
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}
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int
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smb_simpledecrypt(char *dst, const char *src)
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{
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char *ep, hexval[3];
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int len, ch, pos;
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if (strncmp(src, "$$1", 3) != 0)
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return EINVAL;
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src += 3;
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len = strlen(src);
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if (len & 1)
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return EINVAL;
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len /= 2;
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hexval[2] = 0;
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pos = 27;
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while (len--) {
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hexval[0] = *src++;
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hexval[1] = *src++;
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ch = strtoul(hexval, &ep, 16);
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if (*ep != 0)
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return EINVAL;
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ch ^= pos;
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pos += 13;
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if (isascii(ch))
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ch = (isupper(ch) ? ('A' + (ch - 'A' + 13) % 26) :
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islower(ch) ? ('a' + (ch - 'a' + 13) % 26) : ch);
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*dst++ = ch;
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}
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*dst = 0;
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return 0;
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}
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#ifdef APPLE
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static int
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safe_execv(char *args[])
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{
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int pid;
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union wait status;
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pid = fork();
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if (pid == 0) {
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(void)execv(args[0], args);
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errx(EX_OSERR, "%s: execv %s failed, %s\n", __progname,
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args[0], strerror(errno));
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}
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if (pid == -1) {
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fprintf(stderr, "%s: fork failed, %s\n", __progname,
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strerror(errno));
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return (1);
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}
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if (wait4(pid, (int *)&status, 0, NULL) != pid) {
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fprintf(stderr, "%s: BUG executing %s command\n", __progname,
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args[0]);
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return (1);
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} else if (!WIFEXITED(status)) {
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fprintf(stderr, "%s: %s command aborted by signal %d\n",
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__progname, args[0], WTERMSIG(status));
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return (1);
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} else if (WEXITSTATUS(status)) {
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fprintf(stderr, "%s: %s command failed, exit status %d: %s\n",
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__progname, args[0], WEXITSTATUS(status),
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strerror(WEXITSTATUS(status)));
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return (1);
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}
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return (0);
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}
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void
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dropsuid()
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{
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/* drop setuid root privs asap */
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eff_uid = geteuid();
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real_uid = getuid();
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seteuid(real_uid);
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return;
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}
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static int
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kextisloaded(char * kextname)
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{
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mach_port_t kernel_port;
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kmod_info_t *k, *loaded_modules = 0;
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int err, loaded_count = 0;
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/* on error return not loaded - to make loadsmbvfs fail */
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err = task_for_pid(mach_task_self(), 0, &kernel_port);
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if (err) {
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fprintf(stderr, "%s: %s: %s\n", __progname,
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"unable to get kernel task port",
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mach_error_string(err));
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return (0);
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}
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err = kmod_get_info(kernel_port, (void *)&loaded_modules,
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&loaded_count); /* never freed */
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if (err) {
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fprintf(stderr, "%s: %s: %s\n", __progname,
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"kmod_get_info() failed",
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mach_error_string(err));
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return (0);
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}
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for (k = loaded_modules; k; k = k->next ? k+1 : 0)
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if (!strcmp(k->name, kextname))
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return (1);
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return (0);
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}
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#define KEXTLOAD_COMMAND "/sbin/kextload"
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#define FS_KEXT_DIR "/System/Library/Extensions/smbfs.kext"
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#define FULL_KEXTNAME "com.apple.filesystems.smbfs"
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int
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loadsmbvfs()
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{
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const char *kextargs[] = {KEXTLOAD_COMMAND, FS_KEXT_DIR, NULL};
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int error = 0;
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/*
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* temporarily revert to root (required for kextload)
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*/
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seteuid(eff_uid);
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if (!kextisloaded(FULL_KEXTNAME)) {
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error = safe_execv(kextargs);
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if (!error)
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error = !kextisloaded(FULL_KEXTNAME);
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}
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seteuid(real_uid); /* and back to real user */
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return (error);
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}
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#endif /* APPLE */
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