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NetBSD/dist/tcpdump/smbutil.c

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/* $NetBSD: smbutil.c,v 1.6 2004/09/27 23:04:25 dyoung Exp $ */
/*
* Copyright (C) Andrew Tridgell 1995-1999
*
* This software may be distributed either under the terms of the
* BSD-style license that accompanies tcpdump or the GNU GPL version 2
* or later
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/cdefs.h>
#ifndef lint
#if 0
static const char rcsid[] _U_ =
"@(#) Header: /tcpdump/master/tcpdump/smbutil.c,v 1.26.2.2 2003/11/16 08:51:56 guy Exp";
#else
__RCSID("$NetBSD: smbutil.c,v 1.6 2004/09/27 23:04:25 dyoung Exp $");
#endif
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "interface.h"
#include "extract.h"
#include "smb.h"
extern const u_char *startbuf;
/*
* interpret a 32 bit dos packed date/time to some parameters
*/
static void
interpret_dos_date(u_int32_t date, struct tm *tp)
{
u_int32_t p0, p1, p2, p3;
p0 = date & 0xFF;
p1 = ((date & 0xFF00) >> 8) & 0xFF;
p2 = ((date & 0xFF0000) >> 16) & 0xFF;
p3 = ((date & 0xFF000000) >> 24) & 0xFF;
tp->tm_sec = 2 * (p0 & 0x1F);
tp->tm_min = ((p0 >> 5) & 0xFF) + ((p1 & 0x7) << 3);
tp->tm_hour = (p1 >> 3) & 0xFF;
tp->tm_mday = (p2 & 0x1F);
tp->tm_mon = ((p2 >> 5) & 0xFF) + ((p3 & 0x1) << 3) - 1;
tp->tm_year = ((p3 >> 1) & 0xFF) + 80;
}
/*
* common portion:
* create a unix date from a dos date
*/
static time_t
int_unix_date(u_int32_t dos_date)
{
struct tm t;
if (dos_date == 0)
return(0);
interpret_dos_date(dos_date, &t);
t.tm_wday = 1;
t.tm_yday = 1;
t.tm_isdst = 0;
return (mktime(&t));
}
/*
* create a unix date from a dos date
* in network byte order
*/
static time_t
make_unix_date(const u_char *date_ptr)
{
u_int32_t dos_date = 0;
dos_date = EXTRACT_LE_32BITS(date_ptr);
return int_unix_date(dos_date);
}
/*
* create a unix date from a dos date
* in halfword-swapped network byte order!
*/
static time_t
make_unix_date2(const u_char *date_ptr)
{
u_int32_t x, x2;
x = EXTRACT_LE_32BITS(date_ptr);
x2 = ((x & 0xFFFF) << 16) | ((x & 0xFFFF0000) >> 16);
return int_unix_date(x2);
}
/*
* interpret an 8 byte "filetime" structure to a time_t
* It's originally in "100ns units since jan 1st 1601"
*/
static time_t
interpret_long_date(const u_char *p)
{
double d;
time_t ret;
TCHECK2(p[4], 4);
/* this gives us seconds since jan 1st 1601 (approx) */
d = (EXTRACT_LE_32BITS(p + 4) * 256.0 + p[3]) * (1.0e-7 * (1 << 24));
/* now adjust by 369 years to make the secs since 1970 */
d -= 369.0 * 365.25 * 24 * 60 * 60;
/* and a fudge factor as we got it wrong by a few days */
d += (3 * 24 * 60 * 60 + 6 * 60 * 60 + 2);
if (d < 0)
return(0);
ret = (time_t)d;
return(ret);
trunc:
return(0);
}
/*
* interpret the weird netbios "name". Return the name type, or -1 if
* we run past the end of the buffer
*/
static int
name_interpret(const u_char *in, const u_char *maxbuf, char *out)
{
int ret;
int len;
if (in >= maxbuf)
return(-1); /* name goes past the end of the buffer */
TCHECK2(*in, 1);
len = (*in++) / 2;
*out=0;
if (len > 30 || len < 1)
return(0);
while (len--) {
TCHECK2(*in, 2);
if (in + 1 >= maxbuf)
return(-1); /* name goes past the end of the buffer */
if (in[0] < 'A' || in[0] > 'P' || in[1] < 'A' || in[1] > 'P') {
*out = 0;
return(0);
}
*out = ((in[0] - 'A') << 4) + (in[1] - 'A');
in += 2;
out++;
}
*out = 0;
ret = out[-1];
return(ret);
trunc:
return(-1);
}
/*
* find a pointer to a netbios name
*/
static const u_char *
name_ptr(const u_char *buf, int ofs, const u_char *maxbuf)
{
const u_char *p;
u_char c;
p = buf + ofs;
if (p >= maxbuf)
return(NULL); /* name goes past the end of the buffer */
TCHECK2(*p, 1);
c = *p;
/* XXX - this should use the same code that the DNS dissector does */
if ((c & 0xC0) == 0xC0) {
u_int16_t l = EXTRACT_16BITS(buf + ofs) & 0x3FFF;
if (l == 0) {
/* We have a pointer that points to itself. */
return(NULL);
}
p = buf + l;
if (p >= maxbuf)
return(NULL); /* name goes past the end of the buffer */
TCHECK2(*p, 1);
return(buf + l);
} else
return(buf + ofs);
trunc:
return(NULL); /* name goes past the end of the buffer */
}
/*
* extract a netbios name from a buf
*/
static int
name_extract(const u_char *buf, int ofs, const u_char *maxbuf, char *name)
{
const u_char *p = name_ptr(buf, ofs, maxbuf);
if (p == NULL)
return(-1); /* error (probably name going past end of buffer) */
name[0] = '\0';
return(name_interpret(p, maxbuf, name));
}
/*
* return the total storage length of a mangled name
*/
static int
name_len(const unsigned char *s, const unsigned char *maxbuf)
{
const unsigned char *s0 = s;
unsigned char c;
if (s >= maxbuf)
return(-1); /* name goes past the end of the buffer */
TCHECK2(*s, 1);
c = *s;
if ((c & 0xC0) == 0xC0)
return(2);
while (*s) {
if (s >= maxbuf)
return(-1); /* name goes past the end of the buffer */
TCHECK2(*s, 1);
s += (*s) + 1;
}
return(PTR_DIFF(s, s0) + 1);
trunc:
return(-1); /* name goes past the end of the buffer */
}
static void
print_asc(const unsigned char *buf, int len)
{
int i;
for (i = 0; i < len; i++)
safeputchar(buf[i]);
}
static const char *
name_type_str(int name_type)
{
const char *f = NULL;
switch (name_type) {
case 0: f = "Workstation"; break;
case 0x03: f = "Client?"; break;
case 0x20: f = "Server"; break;
case 0x1d: f = "Master Browser"; break;
case 0x1b: f = "Domain Controller"; break;
case 0x1e: f = "Browser Server"; break;
default: f = "Unknown"; break;
}
return(f);
}
void
print_data(const unsigned char *buf, int len)
{
int i = 0;
if (len <= 0)
return;
printf("[%03X] ", i);
for (i = 0; i < len; /*nothing*/) {
printf("%02X ", buf[i] & 0xff);
i++;
if (i%8 == 0)
printf(" ");
if (i % 16 == 0) {
print_asc(&buf[i - 16], 8);
printf(" ");
print_asc(&buf[i - 8], 8);
printf("\n");
if (i < len)
printf("[%03X] ", i);
}
}
if (i % 16) {
int n;
n = 16 - (i % 16);
printf(" ");
if (n>8)
printf(" ");
while (n--)
printf(" ");
n = SMBMIN(8, i % 16);
print_asc(&buf[i - (i % 16)], n);
printf(" ");
n = (i % 16) - n;
if (n > 0)
print_asc(&buf[i - n], n);
printf("\n");
}
}
static void
write_bits(unsigned int val, const char *fmt)
{
const char *p = fmt;
int i = 0;
while ((p = strchr(fmt, '|'))) {
size_t l = PTR_DIFF(p, fmt);
if (l && (val & (1 << i)))
printf("%.*s ", (int)l, fmt);
fmt = p + 1;
i++;
}
}
/* convert a UCS2 string into iso-8859-1 string */
static const char *
unistr(const u_char *s, int *len)
{
static char buf[1000];
int l=0;
static int use_unicode = -1;
if (use_unicode == -1) {
char *p = getenv("USE_UNICODE");
if (p && (atoi(p) == 1))
use_unicode = 1;
else
use_unicode = 0;
}
/* maybe it isn't unicode - a cheap trick */
if (!use_unicode || (s[0] && s[1])) {
*len = strlen((const char *)s) + 1;
return (const char *)s;
}
*len = 0;
if (s[0] == 0 && s[1] != 0) {
s++;
*len = 1;
}
while (l < (int)(sizeof(buf) - 1) && s[0] && s[1] == 0) {
buf[l] = s[0];
s += 2;
l++;
*len += 2;
}
buf[l] = 0;
*len += 2;
return buf;
}
static const u_char *
smb_fdata1(const u_char *buf, const char *fmt, const u_char *maxbuf)
{
int reverse = 0;
const char *attrib_fmt = "READONLY|HIDDEN|SYSTEM|VOLUME|DIR|ARCHIVE|";
int len;
while (*fmt && buf<maxbuf) {
switch (*fmt) {
case 'a':
write_bits(buf[0], attrib_fmt);
buf++;
fmt++;
break;
case 'A':
write_bits(EXTRACT_LE_16BITS(buf), attrib_fmt);
buf += 2;
fmt++;
break;
case '{':
{
char bitfmt[128];
char *p;
int l;
p = strchr(++fmt, '}');
l = PTR_DIFF(p, fmt);
if ((unsigned int)l > sizeof(bitfmt) - 1)
l = sizeof(bitfmt)-1;
strncpy(bitfmt, fmt, l);
bitfmt[l] = '\0';
fmt = p + 1;
write_bits(buf[0], bitfmt);
buf++;
break;
}
case 'P':
{
int l = atoi(fmt + 1);
buf += l;
fmt++;
while (isdigit((unsigned char)*fmt))
fmt++;
break;
}
case 'r':
reverse = !reverse;
fmt++;
break;
case 'D':
{
unsigned int x;
TCHECK2(buf[0], 4);
x = reverse ? EXTRACT_32BITS(buf) : EXTRACT_LE_32BITS(buf);
printf("%d (0x%x)", x, x);
buf += 4;
fmt++;
break;
}
case 'L':
{
unsigned int x1, x2;
TCHECK2(buf[4], 4);
x1 = reverse ? EXTRACT_32BITS(buf) :
EXTRACT_LE_32BITS(buf);
x2 = reverse ? EXTRACT_32BITS(buf + 4) :
EXTRACT_LE_32BITS(buf + 4);
if (x2)
printf("0x%08x:%08x", x2, x1);
else
printf("%d (0x%08x%08x)", x1, x2, x1);
buf += 8;
fmt++;
break;
}
case 'd':
{
unsigned int x;
TCHECK2(buf[0], 2);
x = reverse ? EXTRACT_16BITS(buf) :
EXTRACT_LE_16BITS(buf);
printf("%d (0x%x)", x, x);
buf += 2;
fmt++;
break;
}
case 'W':
{
unsigned int x;
TCHECK2(buf[0], 4);
x = reverse ? EXTRACT_32BITS(buf) :
EXTRACT_LE_32BITS(buf);
printf("0x%X", x);
buf += 4;
fmt++;
break;
}
case 'w':
{
unsigned int x;
TCHECK2(buf[0], 2);
x = reverse ? EXTRACT_16BITS(buf) :
EXTRACT_LE_16BITS(buf);
printf("0x%X", x);
buf += 2;
fmt++;
break;
}
case 'B':
{
unsigned int x;
TCHECK(buf[0]);
x = buf[0];
printf("0x%X", x);
buf += 1;
fmt++;
break;
}
case 'b':
{
unsigned int x;
TCHECK(buf[0]);
x = buf[0];
printf("%u (0x%x)", x, x);
buf += 1;
fmt++;
break;
}
case 'S':
{
/*XXX unistr() */
printf("%.*s", (int)PTR_DIFF(maxbuf, buf), unistr(buf, &len));
buf += len;
fmt++;
break;
}
case 'Z':
{
if (*buf != 4 && *buf != 2)
printf("Error! ASCIIZ buffer of type %u (safety=%lu)\n", *buf,
(unsigned long)PTR_DIFF(maxbuf, buf));
printf("%.*s", (int)PTR_DIFF(maxbuf, buf + 1),
unistr(buf + 1, &len));
buf += len + 1;
fmt++;
break;
}
case 's':
{
int l = atoi(fmt + 1);
printf("%-*.*s", l, l, buf);
buf += l;
fmt++;
while (isdigit((unsigned char)*fmt))
fmt++;
break;
}
case 'h':
{
int l = atoi(fmt + 1);
while (l--)
printf("%02x", *buf++);
fmt++;
while (isdigit((unsigned char)*fmt))
fmt++;
break;
}
case 'n':
{
int t = atoi(fmt+1);
char nbuf[255];
int name_type;
int len;
switch (t) {
case 1:
name_type = name_extract(startbuf, PTR_DIFF(buf, startbuf),
maxbuf, nbuf);
if (name_type < 0)
goto trunc;
len = name_len(buf, maxbuf);
if (len < 0)
goto trunc;
buf += len;
printf("%-15.15s NameType=0x%02X (%s)", nbuf, name_type,
name_type_str(name_type));
break;
case 2:
name_type = buf[15];
printf("%-15.15s NameType=0x%02X (%s)", buf, name_type,
name_type_str(name_type));
buf += 16;
break;
}
fmt++;
while (isdigit((unsigned char)*fmt))
fmt++;
break;
}
case 'T':
{
time_t t;
struct tm *lt;
const char *tstring;
u_int32_t x;
x = EXTRACT_LE_32BITS(buf);
switch (atoi(fmt + 1)) {
case 1:
if (x == 0 || x == 0xFFFFFFFF)
t = 0;
else
t = make_unix_date(buf);
buf += 4;
break;
case 2:
if (x == 0 || x == 0xFFFFFFFF)
t = 0;
else
t = make_unix_date2(buf);
buf += 4;
break;
case 3:
t = interpret_long_date(buf);
buf += 8;
break;
}
if (t != 0) {
lt = localtime(&t);
if (lt != NULL)
tstring = asctime(lt);
else
tstring = "(Can't convert time)\n";
} else
tstring = "NULL\n";
printf("%s", tstring);
fmt++;
while (isdigit((unsigned char)*fmt))
fmt++;
break;
}
default:
putchar(*fmt);
fmt++;
break;
}
}
if (buf >= maxbuf && *fmt)
printf("END OF BUFFER\n");
return(buf);
trunc:
printf("\n");
printf("WARNING: Short packet. Try increasing the snap length\n");
return(NULL);
}
const u_char *
smb_fdata(const u_char *buf, const char *fmt, const u_char *maxbuf)
{
static int depth = 0;
char s[128];
char *p;
while (*fmt) {
switch (*fmt) {
case '*':
fmt++;
while (buf < maxbuf) {
const u_char *buf2;
depth++;
buf2 = smb_fdata(buf, fmt, maxbuf);
depth--;
if (buf2 == NULL)
return(NULL);
if (buf2 == buf)
return(buf);
buf = buf2;
}
return(buf);
case '|':
fmt++;
if (buf >= maxbuf)
return(buf);
break;
case '%':
fmt++;
buf = maxbuf;
break;
case '#':
fmt++;
return(buf);
break;
case '[':
fmt++;
if (buf >= maxbuf)
return(buf);
memset(s, 0, sizeof(s));
p = strchr(fmt, ']');
if ((size_t)(p - fmt + 1) > sizeof(s)) {
/* overrun */
return(buf);
}
strncpy(s, fmt, p - fmt);
s[p - fmt] = '\0';
fmt = p + 1;
buf = smb_fdata1(buf, s, maxbuf);
if (buf == NULL)
return(NULL);
break;
default:
putchar(*fmt);
fmt++;
fflush(stdout);
break;
}
}
if (!depth && buf < maxbuf) {
size_t len = PTR_DIFF(maxbuf, buf);
printf("Data: (%lu bytes)\n", (unsigned long)len);
print_data(buf, len);
return(buf + len);
}
return(buf);
}
typedef struct {
const char *name;
int code;
const char *message;
} err_code_struct;
/* Dos Error Messages */
static err_code_struct dos_msgs[] = {
{ "ERRbadfunc", 1, "Invalid function." },
{ "ERRbadfile", 2, "File not found." },
{ "ERRbadpath", 3, "Directory invalid." },
{ "ERRnofids", 4, "No file descriptors available" },
{ "ERRnoaccess", 5, "Access denied." },
{ "ERRbadfid", 6, "Invalid file handle." },
{ "ERRbadmcb", 7, "Memory control blocks destroyed." },
{ "ERRnomem", 8, "Insufficient server memory to perform the requested function." },
{ "ERRbadmem", 9, "Invalid memory block address." },
{ "ERRbadenv", 10, "Invalid environment." },
{ "ERRbadformat", 11, "Invalid format." },
{ "ERRbadaccess", 12, "Invalid open mode." },
{ "ERRbaddata", 13, "Invalid data." },
{ "ERR", 14, "reserved." },
{ "ERRbaddrive", 15, "Invalid drive specified." },
{ "ERRremcd", 16, "A Delete Directory request attempted to remove the server's current directory." },
{ "ERRdiffdevice", 17, "Not same device." },
{ "ERRnofiles", 18, "A File Search command can find no more files matching the specified criteria." },
{ "ERRbadshare", 32, "The sharing mode specified for an Open conflicts with existing FIDs on the file." },
{ "ERRlock", 33, "A Lock request conflicted with an existing lock or specified an invalid mode, or an Unlock requested attempted to remove a lock held by another process." },
{ "ERRfilexists", 80, "The file named in a Create Directory, Make New File or Link request already exists." },
{ "ERRbadpipe", 230, "Pipe invalid." },
{ "ERRpipebusy", 231, "All instances of the requested pipe are busy." },
{ "ERRpipeclosing", 232, "Pipe close in progress." },
{ "ERRnotconnected", 233, "No process on other end of pipe." },
{ "ERRmoredata", 234, "There is more data to be returned." },
{ NULL, -1, NULL }
};
/* Server Error Messages */
err_code_struct server_msgs[] = {
{ "ERRerror", 1, "Non-specific error code." },
{ "ERRbadpw", 2, "Bad password - name/password pair in a Tree Connect or Session Setup are invalid." },
{ "ERRbadtype", 3, "reserved." },
{ "ERRaccess", 4, "The requester does not have the necessary access rights within the specified context for the requested function. The context is defined by the TID or the UID." },
{ "ERRinvnid", 5, "The tree ID (TID) specified in a command was invalid." },
{ "ERRinvnetname", 6, "Invalid network name in tree connect." },
{ "ERRinvdevice", 7, "Invalid device - printer request made to non-printer connection or non-printer request made to printer connection." },
{ "ERRqfull", 49, "Print queue full (files) -- returned by open print file." },
{ "ERRqtoobig", 50, "Print queue full -- no space." },
{ "ERRqeof", 51, "EOF on print queue dump." },
{ "ERRinvpfid", 52, "Invalid print file FID." },
{ "ERRsmbcmd", 64, "The server did not recognize the command received." },
{ "ERRsrverror", 65, "The server encountered an internal error, e.g., system file unavailable." },
{ "ERRfilespecs", 67, "The file handle (FID) and pathname parameters contained an invalid combination of values." },
{ "ERRreserved", 68, "reserved." },
{ "ERRbadpermits", 69, "The access permissions specified for a file or directory are not a valid combination. The server cannot set the requested attribute." },
{ "ERRreserved", 70, "reserved." },
{ "ERRsetattrmode", 71, "The attribute mode in the Set File Attribute request is invalid." },
{ "ERRpaused", 81, "Server is paused." },
{ "ERRmsgoff", 82, "Not receiving messages." },
{ "ERRnoroom", 83, "No room to buffer message." },
{ "ERRrmuns", 87, "Too many remote user names." },
{ "ERRtimeout", 88, "Operation timed out." },
{ "ERRnoresource", 89, "No resources currently available for request." },
{ "ERRtoomanyuids", 90, "Too many UIDs active on this session." },
{ "ERRbaduid", 91, "The UID is not known as a valid ID on this session." },
{ "ERRusempx", 250, "Temp unable to support Raw, use MPX mode." },
{ "ERRusestd", 251, "Temp unable to support Raw, use standard read/write." },
{ "ERRcontmpx", 252, "Continue in MPX mode." },
{ "ERRreserved", 253, "reserved." },
{ "ERRreserved", 254, "reserved." },
{ "ERRnosupport", 0xFFFF, "Function not supported." },
{ NULL, -1, NULL }
};
/* Hard Error Messages */
err_code_struct hard_msgs[] = {
{ "ERRnowrite", 19, "Attempt to write on write-protected diskette." },
{ "ERRbadunit", 20, "Unknown unit." },
{ "ERRnotready", 21, "Drive not ready." },
{ "ERRbadcmd", 22, "Unknown command." },
{ "ERRdata", 23, "Data error (CRC)." },
{ "ERRbadreq", 24, "Bad request structure length." },
{ "ERRseek", 25 , "Seek error." },
{ "ERRbadmedia", 26, "Unknown media type." },
{ "ERRbadsector", 27, "Sector not found." },
{ "ERRnopaper", 28, "Printer out of paper." },
{ "ERRwrite", 29, "Write fault." },
{ "ERRread", 30, "Read fault." },
{ "ERRgeneral", 31, "General failure." },
{ "ERRbadshare", 32, "A open conflicts with an existing open." },
{ "ERRlock", 33, "A Lock request conflicted with an existing lock or specified an invalid mode, or an Unlock requested attempted to remove a lock held by another process." },
{ "ERRwrongdisk", 34, "The wrong disk was found in a drive." },
{ "ERRFCBUnavail", 35, "No FCBs are available to process request." },
{ "ERRsharebufexc", 36, "A sharing buffer has been exceeded." },
{ NULL, -1, NULL }
};
static struct {
int code;
const char *class;
err_code_struct *err_msgs;
} err_classes[] = {
{ 0, "SUCCESS", NULL },
{ 0x01, "ERRDOS", dos_msgs },
{ 0x02, "ERRSRV", server_msgs },
{ 0x03, "ERRHRD", hard_msgs },
{ 0x04, "ERRXOS", NULL },
{ 0xE1, "ERRRMX1", NULL },
{ 0xE2, "ERRRMX2", NULL },
{ 0xE3, "ERRRMX3", NULL },
{ 0xFF, "ERRCMD", NULL },
{ -1, NULL, NULL }
};
/*
* return a SMB error string from a SMB buffer
*/
char *
smb_errstr(int class, int num)
{
static char ret[128];
int i, j;
ret[0] = 0;
for (i = 0; err_classes[i].class; i++)
if (err_classes[i].code == class) {
if (err_classes[i].err_msgs) {
err_code_struct *err = err_classes[i].err_msgs;
for (j = 0; err[j].name; j++)
if (num == err[j].code) {
snprintf(ret, sizeof(ret), "%s - %s (%s)",
err_classes[i].class, err[j].name, err[j].message);
return ret;
}
}
snprintf(ret, sizeof(ret), "%s - %d", err_classes[i].class, num);
return ret;
}
snprintf(ret, sizeof(ret), "ERROR: Unknown error (%d,%d)", class, num);
return(ret);
}
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