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parser.c
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parser.c
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/* parser.c
* Main command line parser and parser utilities
*
* Yersinia
* By David Barroso <tomac@yersinia.net> and Alfredo Andres <aandreswork@hotmail.com>
* Copyright 2005-2017 Alfredo Andres and David Barroso
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifndef _REENTRANT
#define _REENTRANT
#endif
#include <stdio.h>
#include <errno.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif
#include <sys/socket.h>
#ifdef HAVE_NETINET_IN_SYSTM_H
#include <netinet/in_systm.h>
#else
#ifdef HAVE_NETINET_IN_SYSTEM_H
#include <netinet/in_system.h>
#endif
#endif
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#ifdef HAVE_BSTRING_H
#include <bstring.h>
#endif
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif
#ifdef HAVE_PTHREAD_H
#include <pthread.h>
#endif
#include <stdarg.h>
#include <limits.h>
#include <ctype.h>
#include "parser.h"
static u_int8_t valid_chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
/*
* Initial command line arguments parser.
* Return -1 on error. Return 0 if Ok.
* Use global protocol_defs
*/
int8_t
parser_initial(struct term_tty *tty, struct cl_args *cl_args, int argc, char **argv)
{
int8_t i;
for (i=1; i<(argc); i++)
{
if (!strcmp(argv[i],"-h") || !strcmp(argv[i],"--help"))
{
parser_help();
break;
}
else
if (!strcmp(argv[i],"-V") || !strcmp(argv[i],"--Version"))
{
printf("%s %s\n", PACKAGE, VERSION );
return -1;
}
else
if (!strcmp(argv[i],"-I") || !strcmp(argv[i],"--Interactive"))
{
#ifdef HAS_CURSES
tty->interactive = 1;
#else
printf(" Hmmm... it seems that you don't have ncurses support or Yersinia\n");
printf(" has been configured with --disable-ncurses option...\n");
printf(" Go and get it!!\n\n");
return -1;
#endif
}
else
if (!strcmp(argv[i],"-G") || !strcmp(argv[i],"--gtk"))
{
#ifdef HAVE_GTK
tty->gtk = 1;
#else
printf(" Hmmm... it seems that you don't have gtk support or Yersinia\n");
printf(" has been configured with --disable-gtk option...\n");
printf(" Go and get it!!\n\n");
return -1;
#endif
}
else
if (!strcmp(argv[i],"-D") || !strcmp(argv[i],"--Daemon"))
{
#ifdef HAVE_REMOTE_ADMIN
tty->daemonize = 1;
#else
printf(" Hmmm... it seems that Yersinia has been configured with\n");
printf(" the --disable-admin option...\n");
printf(" Go and get it!!\n\n");
return -1;
#endif
}
else
if (!strcmp(argv[i],"-d") || !strcmp(argv[i],"--debug"))
{
tty->debug = 1;
}
else
if (!strcmp(argv[i], "-c") || !strcmp(argv[i], "--conffile"))
{
i++;
strncpy(tty->config_file, argv[i], sizeof(tty->config_file) - 1 );
}
else
if (!strcmp(argv[i],"-l") || !strcmp(argv[i],"--logfile"))
{
i++;
if ((tty->log_file = fopen(argv[i], "a+")) == NULL)
{
printf("%s: Error opening logfile %s\n", argv[0], argv[i]);
/* If the logfile cannot be opened, the default is yersinia.log */
if ((tty->log_file = fopen("yersinia.log", "a+")) == NULL)
{
printf("%s: Error opening logfile 'yersinia.log'\n", argv[0]);
return -1;
}
}
}
else
if (argv[i][0] != '-')/* Ok, it is a protocol...*/
{ /* Nonexistant protocol (or not visible)...*/
if (((cl_args->proto_index = protocol_proto2index(argv[i])) < 0))
{
printf("%s: Unknown protocol %s!!\n", argv[0], argv[i]);
return -1;
}
cl_args->count = argc-i;
cl_args->argv_tmp = &argv[i];
break;
}
else
{
printf("%s: Unknown option %s!!\n", argv[0], argv[i]);
return -1;
}
} /* for...*/
if (!tty->log_file) {
if ((tty->log_file = fopen("yersinia.log", "a+")) == NULL) {
printf("%s: Error opening logfile 'yersinia.log'\n", argv[0]);
return -1;
}
}
setvbuf(tty->log_file, NULL, _IONBF, 0);
return 0;
}
/*
* Look if *number* of the characters
* are digits.
* Return -1 on error. Return 0 if Ok.
*/
int8_t
parser_are_digits( int8_t *charac, int8_t number )
{
while (number > 0)
{
if ( !isdigit((int)*charac) )
return -1;
charac++;
number--;
}
return 0;
}
/*
* Convert a string to lowercase
* Return nothing.
*/
void
parser_str_tolower( char *charac )
{
while (*charac)
{
*charac = (char)tolower((int)*charac);
charac++;
}
}
/*
* Verify a MAC address...
* Return -1 if error
*/
int8_t
parser_vrfy_mac( char *address, u_int8_t *destination )
{
char *substr, *aux;
u_int8_t data[]={0,0,0};
u_int16_t i=0, j;
substr = address;
/* trim left spaces (can exist in the configuration file) */
/* while (*substr == ' ')
substr++;*/
aux = substr;
while ( (substr = strchr(substr, ':') ))
{
if (substr == aux)
return -1;
if ( (substr-aux) > (sizeof(data)-1))
return -1; /* Overflowed? */
for(j=0; j<(substr-aux);j++)
{
if ( !isxdigit((int)(*(aux+j))) )
return -1;
data[j]=*(aux+j);
}
data[j]=0;
if ( strtol((char *)data, (char **)NULL, 16) > 255 ||
strtol((char *)data, (char **)NULL, 16) < 0 )
return -1;
destination[i]=strtol((char *)data, (char **)NULL, 16);
i++;
if (i==6)
return -1;
substr++;
aux=substr;
}
if (!*aux || (i<5) )
return -1;
for(j=0; *aux && !isspace(*aux); j++,aux++)
{
if ( !isxdigit((int)(*aux)) )
return -1;
data[j]=*aux;
}
data[j]=0;
if ( strtol((char *)data, (char **)NULL, 16) > 255 ||
strtol((char *)data, (char **)NULL, 16) < 0 )
return -1;
destination[i] = strtol((char *)data, (char **)NULL, 16);
return 0;
}
/*
* Verify a bridge id
* Return 1 if error
*/
int8_t
parser_vrfy_bridge_id( char *address, u_int8_t *destination )
{
char *substr, *aux;
u_int8_t data[]={0,0,0};
u_int16_t i, j, k=0;
aux = substr = address;
for (i=0; i<2; i++)
{
for(j=0; j<2;j++)
{
if ( !isxdigit((int)(*(aux+j))) )
return -1;
data[j]=*(aux+j);
}
data[j]=0;
if ( strtol((char *)data, (char **)NULL, 16) > 255 ||
strtol((char *)data, (char **)NULL, 16) < 0 )
return -1;
destination[k]=strtol((char *)data, (char **)NULL, 16);
k++;
aux+= 2*sizeof(u_char);
}
if (*aux != '.')
return -1;
aux++;
for (i=0; i<6; i++)
{
for(j=0; j<2;j++)
{
if ( !isxdigit((int)(*(aux+j))) )
return -1;
data[j]=*(aux+j);
}
data[j]=0;
if ( strtol((char *)data, (char **)NULL, 16) > 255 ||
strtol((char *)data, (char **)NULL, 16) < 0 )
return -1;
destination[k]=strtol((char *)data, (char **)NULL, 16);
k++;
aux+= 2*sizeof(u_char);
}
return 0;
}
/*
* Help function. What do you want to do today?
*/
void
parser_help(void)
{
u_int8_t i, first=1;
printf("%s\n", bin_data);
printf("\nUsage: %s [-hVGIDd] [-l logfile] [-c conffile] protocol [protocol_options]\n", PACKAGE);
printf(" -V Program version.\n");
printf(" -h This help screen.\n");
printf(" -G Graphical mode (GTK).\n");
printf(" -I Interactive mode (ncurses).\n");
printf(" -D Daemon mode.\n");
printf(" -d Debug.\n");
printf(" -l logfile Select logfile.\n");
printf(" -c conffile Select config file.\n");
printf(" protocol One of the following:");
for(i=0; i< MAX_PROTOCOLS; i++)
{
if (protocols[i].visible)
{
if (first)
{
printf(" %s",protocols[i].name_comm);
first = 0;
}
else
printf(", %s", protocols[i].name_comm);
}
}
printf(".\n\nTry '%s protocol -h' to see protocol_options help\n\n", PACKAGE);
printf("Please, see the man page for a full list of options and many examples.\n");
printf("Send your bugs & suggestions to the Yersinia developers <yersinia@yersinia.net>\n\n");
}
/*
*
*/
int8_t
parser_command2index(register const struct _attack_definition *attack_def, register int8_t v)
{
int i=0;
while ( attack_def->desc != NULL )
{
if ( attack_def->v == v )
return (i);
++attack_def;
++i;
}
return (i);
}
int8_t
parser_get_formated_inet_address(u_int32_t in, char *inet, u_int16_t inet_len)
{
char *p;
u_int32_t aux_long;
aux_long = htonl(in);
p = (char *)&aux_long;
if (snprintf(inet, inet_len,"%03d.%03d.%03d.%03d",
(p[0] & 255), (p[1] & 255), (p[2] & 255), (p[3] & 255)) < 0)
return -1;
return 0;
}
int8_t
parser_get_formated_inet_address_fill(u_int32_t in, char *inet, u_int16_t inet_len, int8_t fill_up)
{
char *p;
u_int32_t aux_long;
aux_long = htonl(in);
p = (char *)&aux_long;
if (fill_up)
{
if (snprintf(inet, inet_len,"%03d.%03d.%03d.%03d",
(p[0] & 255), (p[1] & 255), (p[2] & 255), (p[3] & 255)) < 0)
return -1;
}
else
{
if (snprintf(inet, inet_len,"%d.%d.%d.%d",
(p[0] & 255), (p[1] & 255), (p[2] & 255), (p[3] & 255)) < 0)
return -1;
}
return 0;
}
int8_t
parser_get_inet_aton(char *inet, struct in_addr *in)
{
char *stripped_ip, *tmp, dots=0;
char st[4];
char *save_pointer;
u_int8_t i, j;
if ( (strlen(inet) < 7) || (strlen(inet)>15) )
return -1;
if ( (inet[0] == '.') || (inet[strlen(inet)-1] == '.') ||
(!isdigit(inet[0])) || (!isdigit(inet[strlen(inet)-1])) )
return -1;
for (i=1; i< (strlen(inet)-1); i++)
{
if (inet[i] == '.')
{
dots++;
if (inet[i+1] == '.')
return -1;
}
else
{
if (!isdigit(inet[i]))
return -1;
}
}
if (dots!=3)
return -1;
if ((stripped_ip = calloc(1, 16)) == NULL) {
write_log(0, "Error in calloc");
return -1;
}
memcpy((void *)stripped_ip, (void *)inet, strlen(inet));
j = 0;
tmp = strtok_r(stripped_ip, ".", &save_pointer);
for (i=0; i < 4; i++) {
if (tmp) {
snprintf(st, 4, "%d", atoi(tmp));
memcpy((void *)(stripped_ip + j), (void *)st, strlen(st));
j += strlen(st);
if (i < 3) {
stripped_ip[j] = '.';
j++;
} else
stripped_ip[j] = '\0';
tmp = strtok_r(NULL, ".", &save_pointer);
}
}
if (inet_aton(stripped_ip, in) <= 0) {
free(stripped_ip);
write_log(0, "Error in inet_aton\n");
return -1;
}
free(stripped_ip);
return 0;
}
int8_t
parser_get_random_string(u_int8_t *string, u_int8_t len)
{
u_int8_t total, j;
struct timeval tv;
#ifdef HAVE_RAND_R
u_int32_t i;
#endif
total = 0;
if (!string)
return -1;
while (total < len-1) {
if (gettimeofday(&tv, NULL) < 0) {
thread_error("Error in gettimeofday", errno);
return -1;
}
#ifdef HAVE_RAND_R
i = (u_int32_t)tv.tv_usec;
j = rand_r(&i);
#else
if (pthread_mutex_lock(&terms->mutex_rand) != 0)
{
thread_error("get_random_string pthread_mutex_lock()",errno);
return -1;
}
j=rand();
if (pthread_mutex_unlock(&terms->mutex_rand) != 0)
{
thread_error("get_random_string pthread_mutex_unlock()",errno);
return -1;
}
#endif
j = j % (sizeof(valid_chars) - 1);
string[total] = valid_chars[j];
total++;
}
string[len-1] = '\0';
return 0;
}
int8_t
parser_get_random_int(u_int8_t max)
{
u_int8_t j;
struct timeval tv;
#ifdef HAVE_RAND_R
u_int32_t i;
#endif
if (gettimeofday(&tv, NULL) < 0) {
thread_error("Error in gettimeofday", errno);
return -1;
}
#ifdef HAVE_RAND_R
i = (u_int32_t)tv.tv_usec;
j = rand_r(&i);
#else
if (pthread_mutex_lock(&terms->mutex_rand) != 0)
{
thread_error("get_random_int pthread_mutex_lock()",errno);
return -1;
}
j=rand();
if (pthread_mutex_unlock(&terms->mutex_rand) != 0)
{
thread_error("get_random_int pthread_mutex_unlock()",errno);
return -1;
}
#endif
j = j % max;
return j;
}
int8_t
parser_read_config_file(struct term_tty *tty, struct term_node *node)
{
FILE *file;
char buffer[BUFSIZ], *ptr, *ptr2;
u_int8_t state, i;
int16_t proto;
struct commands_param *params;
params = NULL;
state = 0;
proto = -1;
if ((file = fopen(tty->config_file, "r")) == NULL) {
write_log(1, "Error opening configuration file %s\n", tty->config_file);
return -1;
}
while(fgets(buffer, BUFSIZ,file) != NULL)
{
/* trim any initial space */
ptr = buffer;
while((*ptr == ' ') || (*ptr == '\t'))
ptr++;
if ((*ptr == '\n') || (*ptr == '#')) /* Move to the next line */
continue;
switch(state)
{
case 0:
/* State 0. Tokens allowed: global, protocol */
if (strncmp(ptr, "<global>", 8) == 0)
{
/* Global options */
proto = 666;
state = 1;
}
else
{
if (strncmp(ptr, "<protocol", 9) == 0)
{
/* Protocol options */
proto = -1;
for (i = 0; i < MAX_PROTOCOLS; i++)
{
if (protocols[i].visible)
{
if ( strncasecmp(protocols[i].namep, (ptr + 10), strlen( protocols[i].namep ) ) == 0 )
{
proto = protocols[i].proto;
params = (struct commands_param *) protocols[proto].parameters;
}
}
}
if (proto < 0)
{
write_log(1, "Error when parsing file %s, there is no %s protocol (or not visible)!!\n", tty->config_file, (ptr + 10));
fclose( file );
return -1;
}
state = 2;
}
}
break;
case 1:
/* State 1: global options */
if (strncmp(ptr, "</global>", 9) == 0) {
state = 0;
continue;
}
if (strncmp(ptr, "mac_spoofing", 12) == 0)
{
ptr += strlen("mac_spoofing");
if ((ptr = strchr(ptr, '=')) == NULL) {
write_log(1, "Parse error: missing '=' (%s)\n", buffer);
fclose( file );
return -1;
}
tty->mac_spoofing = atoi(ptr + 1);
}
else if (strncmp(ptr, "splash", 6) == 0)
{
ptr += strlen("splash");
if ((ptr = strchr(ptr, '=')) == NULL) {
write_log(1, "Parse error: missing '=' (%s)\n", buffer);
fclose( file );
return -1;
}
tty->splash = atoi(ptr + 1);
}
else if (strncmp(ptr, "port", 4) == 0)
{
ptr += strlen("port");
if ((ptr = strchr(ptr, '=')) == NULL) {
write_log(1, "Parse error: missing '=' (%s)\n", buffer);
fclose( file );
return -1;
}
tty->port = atoi(ptr + 1);
}
else if (strncmp(ptr, "username", 8) == 0)
{
ptr += strlen("username");
if ((ptr = strchr(ptr, '=')) == NULL) {
write_log(1, "Parse error: missing '=' (%s)\n", buffer);
fclose( file );
return -1;
}
ptr++;
/* Trim all the spaces */
while(*ptr == ' ')
ptr++;
/* Trim the \n */
ptr2 = ptr;
while (*ptr2 != '\0')
if (*ptr2 == '\n')
*ptr2 = '\0';
else
ptr2++;
strncpy(tty->username, ptr, MAX_USERNAME);
}
else if (strncmp(ptr, "password", 8) == 0)
{
ptr += strlen("password");
if ((ptr = strchr(ptr, '=')) == NULL) {
write_log(1, "Parse error: missing '=' (%s)\n", buffer);
fclose( file );
return -1;
}
ptr++;
/* Trim all the spaces */
while(*ptr == ' ')
ptr++;
/* Trim the \n */
ptr2 = ptr;
while (*ptr2 != '\0')
if (*ptr2 == '\n')
*ptr2 = '\0';
else
ptr2++;
strncpy(tty->password, (ptr), MAX_PASSWORD);
}
else if (strncmp(ptr, "enable", 6) == 0)
{
ptr += strlen("enable");
if ((ptr = strchr(ptr, '=')) == NULL) {
write_log(1, "Parse error: missing '=' (%s)\n", buffer);
fclose( file );
return -1;
}
ptr++;
/* Trim all the spaces */
while(*ptr == ' ')
ptr++;
/* Trim the \n */
ptr2 = ptr;
while (*ptr2 != '\0')
if (*ptr2 == '\n')
*ptr2 = '\0';
else
ptr2++;
strncpy(tty->e_password, (ptr), MAX_PASSWORD);
}
else if (strncmp(ptr, "hosts", 5) == 0)
{
u_int8_t gotit=0;
ptr += strlen("hosts");
if ((ptr = strchr(ptr, '=')) == NULL) {
write_log(1, "Parse error: missing '=' (%s)\n", buffer);
fclose( file );
return -1;
}
ptr++;
while(!gotit)
{
/* Trim all the spaces */
while((*ptr == ' ')||(*ptr == '\t'))
ptr++;
ptr2 = ptr;
while ((*ptr != '\0') && (*ptr != ' ') && (*ptr != '\t'))
{
if (*ptr == '\n')
{
*ptr = '\0';
gotit=1;
}
else
ptr++;
}
if ((*ptr == ' ') || (*ptr == '\t'))
{
*ptr = '\0';
ptr++;
}
if (ptr != ptr2)
if (parser_vrfy_ip2filter(ptr2,tty) < 0 )
{
write_log(1,"Parse error: error parsing IP address '%s'\n",ptr2);
parser_free_ip2filter(tty->ip_filter);
fclose( file );
return -1;
}
}
}
else
{
write_log(1, "Parse error: %s is not a global option\n", ptr);
fclose( file );
return -1;
}
break;
case 2:
/* State 2: protocol options */
if (strncmp(ptr, "</protocol>", 11) == 0) {
state = 0;
continue;
}
/* Now find any possible field */
i = 0;
while(i < protocols[proto].nparams)
{
if (strncasecmp(params[i].ldesc, ptr, strlen(params[i].ldesc)) == 0)
{
ptr += strlen(params[i].ldesc);
if ((ptr = strchr(ptr, '=')) == NULL) {
write_log(1, "Parse error: missing '=' (%s)\n", buffer);
fclose( file );
return -1;
}
ptr++;
/* Trim all the spaces */
while(*ptr == ' ')
ptr++;
/* For the hex: if exists 0x, then delete! */
if ((*ptr == '0') && (*(ptr+1) == 'x'))
{
ptr++;
ptr++;
}
/* Trim the \n */
if (ptr[strlen(ptr) - 1] == '\n')
ptr[strlen(ptr) - 1] = '\0';
write_log(0, "tengo %s, %d, %s, %d\n", params[i].ldesc, params[i].type, ptr, params[i].size_print);
if ((strlen(ptr)) &&
(parser_filter_param(params[i].type, node->protocol[proto].commands_param[i], ptr,
params[i].size_print,params[i].size) < 0))
{
write_log(0, "Error when parsing %s: %s\n", params[i].ldesc, ptr);
fclose( file );
return -1;
}
/* jump out */
break;
}
i++;
}
/* No success */
if (i == protocols[proto].nparams) {
write_log(1, "Parse error: there is no %s field in %s protocol\n", ptr, protocols[proto].namep);
fclose(file);
return -1;
}
break;
}
}
if (fclose(file) != 0) {
write_log(1, "Error closing configuration file %s\n", tty->config_file);
return -1;
}
return 0;
}
int8_t
parser_write_config_file(struct term_tty *tty)
{
FILE *file;
u_int8_t i, j, k;
char **values;
char temp[6];
struct filter *cursor;
struct commands_param *params;
if ((file = fopen(tty->config_file, "w+")) == NULL) {
write_log(0, "Error opening configuration file %s\n", tty->config_file);
return -1;
}
fputs("#\n", file);
fputs("# Yersinia configuration file example\n", file);
fputs("#\n", file);
fputs("# Please read the README and the man page before complaining\n", file);
fputs("\n", file);
fputs("# Global options\n", file);
fputs("<global>\n", file);
fputs("# MAC Spoofing\n", file);
fputs("mac_spoofing = 1\n", file);
fputs("# Active interfaces\n", file);
fputs("#interfaces = eth0, eth1\n", file);
fputs("# Hosts allowed to connect to the network daemon\n", file);
fputs("# Examples: www.microsoft.com 192.168.1.0/24 10.31-128.*.13 100.200.*.* 2-20.*.*.10-11\n",file);
cursor = tty->ip_filter;
if (!cursor)
fputs("hosts = localhost", file);
else
fputs("hosts =", file);
while(cursor)
{
fputs(" ",file);
fputs(cursor->expression,file);
cursor = cursor->next;
}
fputs("\n",file);
fputs("# Propaganda. It's cool, so please, don't disable it!! :-P\n", file);
fputs("splash = 1\n", file);
fputs("# Username for the admin mode\n", file);
fputs("username = ", file);
fputs(tty->username, file);
fputs("\n", file);
fputs("# Password for the admin mode\n", file);
fputs("password = ", file);
fputs(tty->password, file);
fputs("\n", file);
fputs("# Enable password for the admin mode\n", file);
fputs("enable = ", file);
fputs(tty->e_password, file);
fputs("\n", file);
fputs("# Daemon port\n", file);
fputs("port = ", file);
snprintf(temp, 6, "%hd", tty->port);
fputs(temp, file);
fputs("\n", file);
fputs("</global>\n\n", file);
for (i = 0; i < MAX_PROTOCOLS; i++)
{
if (!protocols[i].visible)
continue;
params = (struct commands_param *) protocols[i].parameters;
fputs("<protocol ", file);
fputs(protocols[i].namep, file);
fputs(">\n", file);
if (protocols[i].get_printable_store == NULL) {
write_log(0, "printable_store in protocol %d is NULL\n", i);
}
if (protocols[i].get_printable_store) {
if ((values = (*protocols[i].get_printable_store)(NULL)) == NULL) {
write_log(0, "Error in get_printable_store\n");
fclose( file );
return -1;