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/*
* netsniff-ng - the packet sniffing beast
* Copyright 2009, 2010 Daniel Borkmann.
* Subject to the GPL, version 2.
*/
#include <stdint.h>
#include "hash.h"
#include "oui.h"
#include "str.h"
#include "protos.h"
#include "pkt_buff.h"
#include "dissector.h"
#include "dissector_eth.h"
#include "xmalloc.h"
struct hash_table eth_lay2;
struct hash_table eth_lay3;
static struct hash_table eth_ether_types;
static struct hash_table eth_ports_udp;
static struct hash_table eth_ports_tcp;
struct port {
unsigned int id;
char *port;
struct port *next;
};
#define __do_lookup_inline(id, struct_name, hash_ptr, struct_member) \
({ \
struct struct_name *entry = lookup_hash(id, hash_ptr); \
\
while (entry && id != entry->id) \
entry = entry->next; \
\
(entry && id == entry->id ? entry->struct_member : NULL); \
})
char *lookup_port_udp(unsigned int id)
{
return __do_lookup_inline(id, port, ð_ports_udp, port);
}
char *lookup_port_tcp(unsigned int id)
{
return __do_lookup_inline(id, port, ð_ports_tcp, port);
}
char *lookup_ether_type(unsigned int id)
{
return __do_lookup_inline(id, port, ð_ether_types, port);
}
#ifdef HAVE_DISSECTOR_PROTOS
static inline void dissector_init_entry(int type)
{
dissector_set_print_type(ðernet_ops, type);
}
static inline void dissector_init_exit(int type)
{
dissector_set_print_type(&none_ops, type);
}
static void dissector_init_layer_2(int type)
{
init_hash(ð_lay2);
INSERT_HASH_PROTOS(arp_ops, eth_lay2);
INSERT_HASH_PROTOS(lldp_ops, eth_lay2);
INSERT_HASH_PROTOS(vlan_ops, eth_lay2);
INSERT_HASH_PROTOS(ipv4_ops, eth_lay2);
INSERT_HASH_PROTOS(ipv6_ops, eth_lay2);
INSERT_HASH_PROTOS(QinQ_ops, eth_lay2);
INSERT_HASH_PROTOS(mpls_uc_ops, eth_lay2);
for_each_hash_int(ð_lay2, dissector_set_print_type, type);
}
static void dissector_init_layer_3(int type)
{
init_hash(ð_lay3);
INSERT_HASH_PROTOS(icmpv4_ops, eth_lay3);
INSERT_HASH_PROTOS(icmpv6_ops, eth_lay3);
INSERT_HASH_PROTOS(igmp_ops, eth_lay3);
INSERT_HASH_PROTOS(ip_auth_ops, eth_lay3);
INSERT_HASH_PROTOS(ip_esp_ops, eth_lay3);
INSERT_HASH_PROTOS(ipv6_dest_opts_ops, eth_lay3);
INSERT_HASH_PROTOS(ipv6_fragm_ops, eth_lay3);
INSERT_HASH_PROTOS(ipv6_hop_by_hop_ops, eth_lay3);
INSERT_HASH_PROTOS(ipv6_in_ipv4_ops, eth_lay3);
INSERT_HASH_PROTOS(ipv6_mobility_ops, eth_lay3);
INSERT_HASH_PROTOS(ipv6_no_next_header_ops, eth_lay3);
INSERT_HASH_PROTOS(ipv6_routing_ops, eth_lay3);
INSERT_HASH_PROTOS(tcp_ops, eth_lay3);
INSERT_HASH_PROTOS(udp_ops, eth_lay3);
for_each_hash_int(ð_lay3, dissector_set_print_type, type);
}
#else
static inline void dissector_init_entry(int type __maybe_unused) {}
static inline void dissector_init_exit(int type __maybe_unused) {}
static void dissector_init_layer_2(int type __maybe_unused) {}
static void dissector_init_layer_3(int type __maybe_unused) {}
#endif
enum ports {
PORTS_UDP,
PORTS_TCP,
PORTS_ETHER,
};
static void dissector_init_ports(enum ports which)
{
FILE *fp;
char buff[128], *ptr, *file, *end;
struct hash_table *table;
struct port *p;
void **pos;
switch (which) {
case PORTS_UDP:
file = PREFIX_STRING "/etc/netsniff-ng/udp.conf";
table = ð_ports_udp;
break;
case PORTS_TCP:
file = PREFIX_STRING "/etc/netsniff-ng/tcp.conf";
table = ð_ports_tcp;
break;
case PORTS_ETHER:
file = PREFIX_STRING "/etc/netsniff-ng/ether.conf";
table = ð_ether_types;
break;
default:
bug();
}
fp = fopen(file, "r");
if (!fp)
panic("No %s found!\n", file);
memset(buff, 0, sizeof(buff));
while (fgets(buff, sizeof(buff), fp) != NULL) {
buff[sizeof(buff) - 1] = 0;
ptr = buff;
p = xmalloc(sizeof(*p));
p->id = strtol(ptr, &end, 0);
/* not a valid line, skip */
if (p->id == 0 && end == ptr) {
xfree(p);
continue;
}
ptr = strstr(buff, ", ");
/* likewise */
if (!ptr) {
xfree(p);
continue;
}
ptr += strlen(", ");
ptr = strtrim_right(ptr, '\n');
ptr = strtrim_right(ptr, ' ');
p->port = xstrdup(ptr);
p->next = NULL;
pos = insert_hash(p->id, p, table);
if (pos) {
p->next = *pos;
*pos = p;
}
memset(buff, 0, sizeof(buff));
}
fclose(fp);
}
static int dissector_cleanup_ports(void *ptr)
{
struct port *tmp, *p = ptr;
if (!ptr)
return 0;
while ((tmp = p->next)) {
xfree(p->port);
xfree(p);
p = tmp;
}
xfree(p->port);
xfree(p);
return 0;
}
void dissector_init_ethernet(int fnttype)
{
dissector_init_entry(fnttype);
dissector_init_layer_2(fnttype);
dissector_init_layer_3(fnttype);
dissector_init_exit(fnttype);
#ifdef __WITH_PROTOS
dissector_init_oui();
#endif
dissector_init_ports(PORTS_UDP);
dissector_init_ports(PORTS_TCP);
dissector_init_ports(PORTS_ETHER);
}
void dissector_cleanup_ethernet(void)
{
free_hash(ð_lay2);
free_hash(ð_lay3);
for_each_hash(ð_ether_types, dissector_cleanup_ports);
for_each_hash(ð_ports_udp, dissector_cleanup_ports);
for_each_hash(ð_ports_tcp, dissector_cleanup_ports);
free_hash(ð_ether_types);
free_hash(ð_ports_udp);
free_hash(ð_ports_tcp);
#ifdef __WITH_PROTOS
dissector_cleanup_oui();
#endif
}
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