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/*
* decode.c
*
* Copyright (c) 2000 Dug Song <dugsong@monkey.org>
*
* $Id: decode.c,v 1.13 2001/03/15 08:32:59 dugsong Exp $
*/
#include "config.h"
#include <sys/types.h>
#include <arpa/telnet.h>
#include <rpc/rpc.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "base64.h"
#include "options.h"
#include "decode.h"
#include "crc32.h"
extern int decode_hex(u_char *, int, u_char *, int);
extern int decode_ftp(u_char *, int, u_char *, int);
extern int decode_ssh(u_char *, int, u_char *, int);
extern int decode_telnet(u_char *, int, u_char *, int);
extern int decode_smtp(u_char *, int, u_char *, int);
extern int decode_pptp(u_char *, int, u_char *, int);
extern int decode_http(u_char *, int, u_char *, int);
extern int decode_ospf(u_char *, int, u_char *, int);
extern int decode_poppass(u_char *, int, u_char *, int);
extern int decode_pop(u_char *, int, u_char *, int);
extern int decode_nntp(u_char *, int, u_char *, int);
extern int decode_smb(u_char *, int, u_char *, int);
extern int decode_imap(u_char *, int, u_char *, int);
extern int decode_snmp(u_char *, int, u_char *, int);
extern int decode_ldap(u_char *, int, u_char *, int);
extern int decode_mmxp(u_char *, int, u_char *, int);
extern int decode_sni(u_char *, int, u_char *, int);
extern int decode_rlogin(u_char *, int, u_char *, int);
extern int decode_rip(u_char *, int, u_char *, int);
extern int decode_socks(u_char *, int, u_char *, int);
extern int decode_citrix(u_char *, int, u_char *, int);
extern int decode_oracle(u_char *, int, u_char *, int);
extern int decode_tds(u_char *, int, u_char *, int);
extern int decode_sniffer(u_char *, int, u_char *, int);
extern int decode_cvs(u_char *, int, u_char *, int);
extern int decode_icq(u_char *, int, u_char *, int);
extern int decode_napster(u_char *, int, u_char *, int);
extern int decode_aim(u_char *, int, u_char *, int);
extern int decode_postgresql(u_char *, int, u_char *, int);
extern int decode_pcanywhere(u_char *, int, u_char *, int);
extern int decode_x11(u_char *, int, u_char *, int);
extern int decode_irc(u_char *, int, u_char *, int);
extern int decode_portmap(u_char *, int, u_char *, int);
extern int decode_mountd(u_char *, int, u_char *, int);
extern int decode_vrrp(u_char *, int, u_char *, int);
extern int decode_ypserv(u_char *, int, u_char *, int);
extern int decode_yppasswd(u_char *, int, u_char *, int);
static struct decode decodes[] = {
{ "hex", decode_hex },
{ "ftp", decode_ftp },
{ "ssh", decode_ssh },
{ "telnet", decode_telnet },
{ "smtp", decode_smtp },
{ "pptp", decode_pptp },
{ "http", decode_http },
{ "ospf", decode_ospf },
{ "poppass", decode_poppass },
{ "pop2", decode_pop },
{ "pop3", decode_pop },
{ "nntp", decode_nntp },
{ "smb", decode_smb },
{ "imap", decode_imap },
{ "snmp", decode_snmp },
{ "ldap", decode_ldap },
{ "mmxp", decode_mmxp },
{ "https", decode_sni },
{ "rlogin", decode_rlogin },
{ "rip", decode_rip },
{ "socks", decode_socks },
{ "citrix", decode_citrix },
{ "oracle", decode_oracle },
{ "tds", decode_tds },
{ "sniffer", decode_sniffer },
{ "cvs", decode_cvs },
{ "icq", decode_icq },
{ "napster", decode_napster },
{ "aim", decode_aim },
{ "postgresql", decode_postgresql },
{ "pcanywhere", decode_pcanywhere },
{ "vrrp", decode_vrrp },
{ "x11", decode_x11 },
{ "irc", decode_irc },
{ "portmap", decode_portmap },
{ "mountd", decode_mountd },
{ "ypserv", decode_ypserv },
{ "yppasswd", decode_yppasswd },
{ NULL }
};
struct _dc_meta dc_meta; // Globally shared.
void
dc_update(struct _dc_meta *m, const void *buf, size_t len) {
if (Opt_show_dups)
return;
m->crc = crc32_update(buf, len, m->crc);
}
struct decode *
getdecodebyname(const char *name)
{
struct decode *dc;
for (dc = decodes; dc->dc_name != NULL; dc++) {
if (strcasecmp(dc->dc_name, name) == 0)
return (dc);
}
return (NULL);
}
/* Strip telnet options, as well as suboption data. */
int
strip_telopts(u_char *buf, int len)
{
int i, j, subopt = 0;
char *p, *q;
for (i = j = 0; i < len; i++) {
if (buf[i] == IAC) {
if (++i >= len) break;
else if (buf[i] > SB)
i++;
else if (buf[i] == SB) {
/* XXX - check for autologin username. */
p = buf + i + 1;
if ((q = bufbuf(p, len - i, "\xff", 1))
!= NULL) {
if ((p = bufbuf(p, q - p, "USER\x01",
5)) != NULL) {
p += 5;
buf[j++] = '[';
memcpy(buf + j, p, q - p);
j += q - p;
buf[j++] = ']';
buf[j++] = '\n';
}
}
subopt = 1;
}
else if (buf[i] == SE) {
if (!subopt) j = 0;
subopt = 0;
}
}
else if (!subopt) {
/* XXX - convert isolated returns to newlines. */
if (buf[i] == '\r' && i + 1 < len &&
buf[i + 1] != '\n')
buf[j++] = '\n';
/* XXX - strip binary nulls. */
else if (buf[i] != '\0')
buf[j++] = buf[i];
}
}
buf[j] = '\0';
return (j);
}
/* Strip a string buffer down to a maximum number of lines. */
int
strip_lines(char *buf, int max_lines)
{
char *p;
int lines, nonascii;
if (!buf) return (0);
lines = nonascii = 0;
for (p = buf; *p && lines < max_lines; p++) {
if (*p == '\n') lines++;
if (!isascii(*p)) nonascii++;
}
if (*p) *p = '\0';
/* XXX - lame ciphertext heuristic */
if (nonascii * 3 > p - buf)
return (0);
return (lines);
}
int
is_ascii_string(char *buf, int len)
{
int i;
for (i = 0; i < len; i++)
if (!isascii(buf[i])) return (0);
return (1);
}
u_char *
bufbuf(u_char *big, int blen, u_char *little, int llen)
{
u_char *p;
for (p = big; p <= big + blen - llen; p++) {
if (memcmp(p, little, llen) == 0)
return (p);
}
return (NULL);
}
// WARNING: sz must be >= 1
u_char *
ascii_string(u_char *buf, int sz) {
u_char *end = buf + sz;
u_char *ptr = buf;
while (ptr < end) {
if (*ptr == 0x0d)
break;
if (*ptr == 0x0a)
break;
if (*ptr == 0x00)
break;
if (!isascii(*ptr)) {
*ptr = '?';
}
ptr++;
}
if (ptr >= end)
ptr--;
if (*ptr != 0x00)
*ptr = '\0';
return buf;
}
u_char *
color_domain(u_char *dst, size_t dsz, u_char *src) {
int n = 0;
u_char *end = src + strlen(src);
int is_ip = 1;
while ((n < 2) && (src < end--)) {
if (*end == '.') {
n++;
continue;
}
if (!((*end >= '0') && (*end <= '9')))
is_ip = 0;
}
if ((!is_ip) && (n >= 2)) {
*end = '\0';
snprintf(dst, dsz, CM "%s"CDM ".%s"CN, src, end + 1);
// snprintf(dst, dsz, CM CUL"%s"CDM CUL".%s"CN, src, end + 1);
} else
snprintf(dst, dsz, CDM "%s"CN, src);
// snprintf(dst, dsz, CDM CUL"%s"CN, src);
return dst;
}
struct _ip_colors {
char *pre;
char *mid;
char *suf;
};
struct _ip_colors ipcol[] = {
{CDC, CC CF, CN CC},
{CDR, CR CF, CN CR},
{CDG, CG CF, CN CG},
{CDB, CB CF, CN CB},
{CDY, CY CF, CN CY},
{CDM, CM CF, CN CM}
};
#ifndef int_ntoa
# define int_ntoa(x) inet_ntoa(*((struct in_addr *)&x))
#endif
// Assign a random color scheme to an IP.
u_char *
color_ip(u_char *dst, size_t dsz, in_addr_t ip) {
char *pre, *suf, *mid;
char *src = int_ntoa(ip);
char *end = src + strlen(src);
char *pos[3];
int n = 3;
while ((n > 0) && (src < end--)) {
if (*end != '.')
continue;
pos[--n] = end;
}
if (n > 0) {
// Not '3' dots. Not an IPv4
snprintf(dst, dsz, "%d %s", n, src);
return dst;
}
// Pick color by /24
struct _ip_colors *ipc = &ipcol[crc32(&ip, 3) % (sizeof ipcol / sizeof *ipcol)];
*pos[0] = *pos[2] = '\0';
snprintf(dst, dsz, "%s%s.%s%s.%s%s"CN, ipc->pre, src, ipc->mid, pos[0] + 1, ipc->suf, pos[2] + 1);
return dst;
}
int
decode_authplain(u_char *p, char **userp, char **passwordp) {
int i, j, n;
u_char *s;
j = base64_pton(p, p, strlen(p));
p[j] = '\0';
n = 0;
s = p;
/* p consists of three parts, divided by \0 */
while (s <= &p[j] && n<=3) {
if (n == 0) {
/* we do not process this portion yet */
} else if (n == 1) {
*userp = (char *)s;
} else if (n == 2) {
*passwordp = (char *)s;
return 0;
}
n++;
while (*s) s++;
s++;
}
return -1;
}
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