enoch/n2n
1
0
Fork 0
mirror of https://github.com/ntop/n2n.git synced 2024-09-19 16:41:11 +02:00
Code Issues Actions Packages Projects Releases 1 Wiki Activity
n2n/src/network_traffic_filter.c
Logan oos Even e686b9592c
(C) update (#965)
2022-03-12 10:22:42 +01:00

784 lines
31 KiB
C
Raw Blame History

/**
* (C) 2007-22 - ntop.org and contributors
*
* 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 3 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 see see <http://www.gnu.org/licenses/>
*
*/
#include "n2n.h"
#include "network_traffic_filter.h"
#include "uthash.h"
// cache that hit less than 10 while 10000 package processed will be delete;
#define CLEAR_CACHE_EVERY_X_COUNT 10000
#define CLAER_CACHE_ACTIVE_COUNT 10
/* for [-Wmissing-declarations] */
const char* get_filter_packet_proto_name (filter_packet_proto proto);
const char* get_filter_packet_proto_name (filter_packet_proto proto) {
switch(proto) {
case FPP_ARP:
return "ARP";
case FPP_TCP:
return "TCP";
case FPP_UDP:
return "UDP";
case FPP_ICMP:
return "ICMP";
case FPP_IGMP:
return "IGMP";
default:
return "UNKNOWN_PROTO";
}
}
/* for [-Wmissing-declarations] */
const char* get_filter_packet_info_log_string (packet_address_proto_info_t* info);
const char* get_filter_packet_info_log_string (packet_address_proto_info_t* info) {
static char buf[1024] = {0};
switch(info->proto) {
case FPP_ARP:
case FPP_ICMP:
case FPP_IGMP:
return get_filter_packet_proto_name(info->proto);
case FPP_TCP:
case FPP_UDP: {
struct in_addr src, dst;
src.s_addr = info->src_ip;
dst.s_addr = info->dst_ip;
const char* proto = get_filter_packet_proto_name(info->proto);
char src_ip[64] = {0};
char dst_ip[64] = {0};
strcpy(src_ip, inet_ntoa(src));
strcpy(dst_ip, inet_ntoa(dst));
sprintf(buf, "%s\t%s:%d->%s:%d", proto, src_ip, info->src_port, dst_ip, info->dst_port);
return buf;
}
default:
return "UNKNOWN_PROTO";
}
}
/* for [-Wmissing-declarations] */
void collect_packet_info (packet_address_proto_info_t* out_info, unsigned char *buffer, int size);
void collect_packet_info (packet_address_proto_info_t* out_info, unsigned char *buffer, int size) {
ether_hdr_t *hdr_ether = (ether_hdr_t*)buffer;
uint16_t ether_type = ntohs(hdr_ether->type);
struct n2n_iphdr *hdr_ip = NULL;
struct n2n_tcphdr *hdr_tcp = NULL;
struct n2n_udphdr *udp_hdr = NULL;
memset(out_info, 0, sizeof(packet_address_proto_info_t));
switch(ether_type) {
case 0x0800: {
buffer += sizeof(ether_hdr_t);
size -= sizeof(ether_hdr_t);
if(size <= 0) {
return;
}
hdr_ip = (struct n2n_iphdr*)buffer;
switch(hdr_ip->version) {
case 4: {
out_info->src_ip = hdr_ip->saddr;
out_info->dst_ip = hdr_ip->daddr;
switch(hdr_ip->protocol) {
case 0x01:
out_info->proto = FPP_ICMP;
break;
case 0x02:
out_info->proto = FPP_IGMP;
break;
case 0x06: {
out_info->proto = FPP_TCP;
buffer += hdr_ip->ihl * 4;
size -= hdr_ip->ihl * 4;
if(size <= 0) {
return;
}
hdr_tcp = (struct n2n_tcphdr*)buffer;
out_info->src_port = ntohs(hdr_tcp->source);
out_info->dst_port = ntohs(hdr_tcp->dest);
break;
}
case 0x11: {
out_info->proto = FPP_UDP;
buffer += hdr_ip->ihl * 4;
size -= hdr_ip->ihl * 4;
if(size <= 0) {
return;
}
udp_hdr = (struct n2n_udphdr*)buffer;
out_info->src_port = ntohs(udp_hdr->source);
out_info->dst_port = ntohs(udp_hdr->dest);
break;
}
default:
out_info->proto = FPP_UNKNOWN;
};
break;
}
case 6: {
// TODO: IPV6 Not Support
out_info->proto = FPP_UNKNOWN;
break;
}
default:
out_info->proto = FPP_UNKNOWN;
}
break;
}
case 0x0806:
out_info->proto = FPP_ARP;
break;
case 0x86DD:
out_info->proto = FPP_UNKNOWN;
break;
default:
traceEvent(TRACE_DEBUG, "collect_packet_info stumbled across the unknown ether type 0x%04X", ether_type);
};
}
/* for [-Wmissing-declarations] */
const char* get_filter_rule_info_log_string (filter_rule_t* rule);
const char* get_filter_rule_info_log_string (filter_rule_t* rule) {
static char buf[1024] = {0};
char* print_start = buf;
char src_net[64] = {0};
char dst_net[64] = {0};
struct in_addr src, dst;
src.s_addr = rule->key.src_net_cidr;
dst.s_addr = rule->key.dst_net_cidr;
strcpy(src_net, inet_ntoa(src));
strcpy(dst_net, inet_ntoa(dst));
print_start += sprintf(print_start, "%s/%d:[%d,%d],%s/%d:[%d,%d]",
src_net, rule->key.src_net_bit_len,
rule->key.src_port_range.start_port, rule->key.src_port_range.end_port,
dst_net, rule->key.dst_net_bit_len,
rule->key.dst_port_range.start_port, rule->key.dst_port_range.end_port
#if 0
,
rule->bool_accept_tcp ? '+' : '-', rule->bool_accept_udp ? '+' : '-', rule->bool_accept_icmp ? '+' : '-'
#endif
);
if(rule->key.bool_tcp_configured) {
print_start += sprintf(print_start, ",TCP%c", rule->bool_accept_tcp ? '+' : '-');
}
if(rule->key.bool_udp_configured) {
print_start += sprintf(print_start, ",UDP%c", rule->bool_accept_udp ? '+' : '-');
}
if(rule->key.bool_icmp_configured) {
print_start += sprintf(print_start, ",ICMP%c", rule->bool_accept_icmp ? '+' : '-');
}
return buf;
}
/* for [-Wmissing-declarations] */
uint8_t march_cidr_and_address (in_addr_t network, uint8_t net_bitlen, in_addr_t ip_addr);
uint8_t march_cidr_and_address (in_addr_t network, uint8_t net_bitlen, in_addr_t ip_addr) {
in_addr_t mask = 0, ip_addr_network = 0;
network = ntohl(network);
ip_addr = ntohl(ip_addr);
uint32_t mask1 = net_bitlen != 0 ? ((~mask) << (32u-net_bitlen)) : 0;
ip_addr_network = ip_addr & mask1;
if(network == ip_addr_network) {
return net_bitlen + 1; // march 0.0.0.0/0 still march success, that case return 1
} else {
return 0;
}
}
/* for [-Wmissing-declarations] */
uint8_t march_rule_and_cache_key (filter_rule_key_t *rule_key, packet_address_proto_info_t *pkt_addr_info);
// if ports march, compare cidr. if cidr ok, return sum of src&dst cidr net_bitlen. means always select larger net_bitlen record when multi record is marched.
uint8_t march_rule_and_cache_key (filter_rule_key_t *rule_key, packet_address_proto_info_t *pkt_addr_info) {
// march failed if proto is not configured at the rule.
switch(pkt_addr_info->proto) {
case FPP_ICMP:
if(!rule_key->bool_icmp_configured) {
return 0;
}
break;
case FPP_UDP:
if(!rule_key->bool_udp_configured) {
return 0;
}
break;
case FPP_TCP:
if(!rule_key->bool_tcp_configured) {
return 0;
}
break;
default:
return 0;
}
// ignore ports for ICMP proto.
if(pkt_addr_info->proto == FPP_ICMP || (rule_key->src_port_range.start_port <= pkt_addr_info->src_port
&& pkt_addr_info->src_port <= rule_key->src_port_range.end_port
&& rule_key->dst_port_range.start_port <= pkt_addr_info->dst_port
&& pkt_addr_info->dst_port <= rule_key->dst_port_range.end_port)) {
uint8_t march_src_score = march_cidr_and_address(rule_key->src_net_cidr, rule_key->src_net_bit_len, pkt_addr_info->src_ip);
uint8_t march_dst_score = march_cidr_and_address(rule_key->dst_net_cidr, rule_key->dst_net_bit_len, pkt_addr_info->dst_ip);
if((march_src_score > 0) && (march_dst_score > 0)) {
return march_src_score + march_dst_score;
}
}
return(0);
}
/* for [-Wmissing-declarations] */
filter_rule_t* get_filter_rule (filter_rule_t **rules, packet_address_proto_info_t *pkt_addr_info);
filter_rule_t* get_filter_rule (filter_rule_t **rules, packet_address_proto_info_t *pkt_addr_info) {
filter_rule_t *item = 0, *tmp = 0, *marched_rule = 0;
int march_score = 0;
HASH_ITER(hh, *rules, item, tmp) {
/* ... it is safe to delete and free s here */
uint8_t cur_march_score = march_rule_and_cache_key(&(item->key), pkt_addr_info);
if(cur_march_score > march_score) {
marched_rule = item;
march_score = cur_march_score;
}
}
return marched_rule;
}
/* for [-Wmissing-declarations] */
void update_and_clear_cache_if_need (network_traffic_filter_t *filter);
void update_and_clear_cache_if_need (network_traffic_filter_t *filter) {
if(++(filter->work_count_scene_last_clear) > CLEAR_CACHE_EVERY_X_COUNT) {
filter_rule_pair_cache_t *item = NULL, *tmp = NULL;
HASH_ITER(hh, filter->connections_rule_cache, item, tmp) {
/* ... it is safe to delete and free s here */
if(item->active_count < CLAER_CACHE_ACTIVE_COUNT) {
traceEvent(TRACE_DEBUG, "### DELETE filter cache %s", get_filter_packet_info_log_string(&item->key));
HASH_DEL(filter->connections_rule_cache, item);
free(item);
} else {
item->active_count = 0;
}
}
filter->work_count_scene_last_clear = 0;
}
}
/* for [-Wmissing-declarations] */
filter_rule_pair_cache_t* get_or_create_filter_rule_cache (network_traffic_filter_t *filter, packet_address_proto_info_t *pkt_addr_info);
filter_rule_pair_cache_t* get_or_create_filter_rule_cache (network_traffic_filter_t *filter, packet_address_proto_info_t *pkt_addr_info) {
filter_rule_pair_cache_t* rule_cache_find_result = 0;
HASH_FIND(hh, filter->connections_rule_cache, pkt_addr_info, sizeof(packet_address_proto_info_t), rule_cache_find_result);
if(!rule_cache_find_result) {
filter_rule_t* rule = get_filter_rule(&filter->rules, pkt_addr_info);
if(!rule) {
return NULL;
}
rule_cache_find_result = malloc(sizeof(filter_rule_pair_cache_t));
memset(rule_cache_find_result, 0, sizeof(filter_rule_pair_cache_t));
rule_cache_find_result->key = *pkt_addr_info;
switch(rule_cache_find_result->key.proto) {
case FPP_ICMP:
rule_cache_find_result->bool_allow_traffic = rule->bool_accept_icmp;
break;
case FPP_UDP:
rule_cache_find_result->bool_allow_traffic = rule->bool_accept_udp;
break;
case FPP_TCP:
rule_cache_find_result->bool_allow_traffic = rule->bool_accept_tcp;
break;
default:
traceEvent(TRACE_WARNING, "### Generate filter rule cache failed!");
return NULL;
}
traceEvent(TRACE_DEBUG, "### ADD filter cache %s", get_filter_packet_info_log_string(&rule_cache_find_result->key));
HASH_ADD(hh, filter->connections_rule_cache, key, sizeof(packet_address_proto_info_t), rule_cache_find_result);
}
++(rule_cache_find_result->active_count);
update_and_clear_cache_if_need(filter);
return rule_cache_find_result;
}
/* for [-Wmissing-declarations] */
n2n_verdict filter_packet_from_peer (network_traffic_filter_t *filter, n2n_edge_t *eee, const n2n_sock_t *peer, uint8_t *payload, uint16_t payload_size);
n2n_verdict filter_packet_from_peer (network_traffic_filter_t *filter, n2n_edge_t *eee, const n2n_sock_t *peer, uint8_t *payload, uint16_t payload_size) {
filter_rule_pair_cache_t *cur_pkt_rule = 0;
packet_address_proto_info_t pkt_info;
collect_packet_info(&pkt_info, payload, payload_size);
cur_pkt_rule = get_or_create_filter_rule_cache(filter, &pkt_info);
if(cur_pkt_rule && !cur_pkt_rule->bool_allow_traffic) {
traceEvent(TRACE_DEBUG, "### DROP %s", get_filter_packet_info_log_string(&pkt_info));
return N2N_DROP;
}
return N2N_ACCEPT;
}
/* for [-Wmissing-declarations] */
n2n_verdict filter_packet_from_tap (network_traffic_filter_t *filter, n2n_edge_t *eee, uint8_t *payload, uint16_t payload_size);
n2n_verdict filter_packet_from_tap (network_traffic_filter_t *filter, n2n_edge_t *eee, uint8_t *payload, uint16_t payload_size) {
filter_rule_pair_cache_t *cur_pkt_rule = 0;
packet_address_proto_info_t pkt_info;
collect_packet_info(&pkt_info, payload, payload_size);
cur_pkt_rule = get_or_create_filter_rule_cache(filter, &pkt_info);
if(cur_pkt_rule && !cur_pkt_rule->bool_allow_traffic) {
traceEvent(TRACE_DEBUG, "### DROP %s", get_filter_packet_info_log_string(&pkt_info));
return N2N_DROP;
}
return N2N_ACCEPT;
}
/* for [-Wmissing-declarations] */
network_traffic_filter_t *create_network_traffic_filter ();
network_traffic_filter_t *create_network_traffic_filter () {
network_traffic_filter_t *filter = malloc(sizeof(network_traffic_filter_t));
memset(filter, 0, sizeof(network_traffic_filter_t));
filter->filter_packet_from_peer = filter_packet_from_peer;
filter->filter_packet_from_tap = filter_packet_from_tap;
return filter;
}
/* for [-Wmissing-declarations] */
void destroy_network_traffic_filter (network_traffic_filter_t *filter);
void destroy_network_traffic_filter (network_traffic_filter_t *filter) {
filter_rule_t *el = 0, *tmp = 0;
filter_rule_pair_cache_t* el1 = 0, * tmp1 = 0;
HASH_ITER(hh, filter->rules, el, tmp) {
HASH_DEL(filter->rules, el);
free(el);
}
HASH_ITER(hh, filter->connections_rule_cache, el1, tmp1) {
HASH_DEL(filter->connections_rule_cache, el1);
free(el);
}
free(filter);
}
/* for [-Wmissing-declarations] */
void network_traffic_filter_add_rule (network_traffic_filter_t* filter, filter_rule_t* rules);
void network_traffic_filter_add_rule (network_traffic_filter_t* filter, filter_rule_t* rules) {
filter_rule_t *item = NULL, *tmp = NULL;
HASH_ITER(hh, rules, item, tmp) {
filter_rule_t *new_rule = malloc(sizeof(filter_rule_t));
memcpy(new_rule, item, sizeof(filter_rule_t));
HASH_ADD(hh, filter->rules, key, sizeof(filter_rule_key_t), new_rule);
traceEvent(TRACE_NORMAL, "### ADD network traffic filter %s", get_filter_rule_info_log_string(new_rule));
}
}
/* for [-Wmissing-declarations] */
in_addr_t get_int32_addr_from_ip_string (const char* begin, const char* next_pos_of_last_char);
in_addr_t get_int32_addr_from_ip_string (const char* begin, const char* next_pos_of_last_char) {
char buf[16] = {0};
if((next_pos_of_last_char - begin) > 15) {
traceEvent(TRACE_WARNING, "Internal Error");
return -1;
}
memcpy(buf, begin, (next_pos_of_last_char - begin));
return inet_addr(buf);
}
/* for [-Wmissing-declarations] */
int get_int32_from_number_string (const char* begin, const char* next_pos_of_last_char);
int get_int32_from_number_string (const char* begin, const char* next_pos_of_last_char) {
char buf[6] = {0};
if((next_pos_of_last_char - begin) > 5 ) { // max is 65535, 5 char
traceEvent(TRACE_WARNING, "Internal Error");
return 0;
}
memcpy(buf, begin, (next_pos_of_last_char - begin));
return atoi(buf);
}
/* for [-Wmissing-declarations] */
void process_traffic_filter_proto (const char* begin, const char* next_pos_of_last_char, filter_rule_t *rule_struct);
void process_traffic_filter_proto (const char* begin, const char* next_pos_of_last_char, filter_rule_t *rule_struct) {
char buf[6] = {0};
if((next_pos_of_last_char - begin) > 5 ) { // max length str is "ICMP+", 5 char
traceEvent(TRACE_WARNING, "Internal Error");
}
memcpy(buf, begin, (next_pos_of_last_char - begin));
if(strstr(buf, "TCP")) {
rule_struct->key.bool_tcp_configured = 1;
rule_struct->bool_accept_tcp = buf[3] == '+';
} else if(strstr(buf, "UDP")) {
rule_struct->key.bool_udp_configured = 1;
rule_struct->bool_accept_udp = buf[3] == '+';
} else if(strstr(buf, "ICMP")) {
rule_struct->key.bool_icmp_configured = 1;
rule_struct->bool_accept_icmp = buf[4] == '+';
} else {
traceEvent(TRACE_WARNING, "Invalid Proto : %s", buf);
}
}
typedef enum {
FPS_SRC_NET = 1,
FPS_SRC_NET_BIT_LEN,
FPS_SRC_PORT_SINGLE,
FPS_SRC_PORT_RANGE,
FPS_SRC_PORT_START,
FPS_SRC_PORT_END,
FPS_DST_NET,
FPS_DST_NET_BIT_LEN,
FPS_DST_PORT_SINGLE,
FPS_DST_PORT_RANGE,
FPS_DST_PORT_START,
FPS_DST_PORT_END,
FPS_PROTO
} filter_process_stage;
/* for [-Wmissing-declarations] */
uint8_t process_traffic_filter_rule_str (const char *rule_str, filter_rule_t *rule_struct);
uint8_t process_traffic_filter_rule_str (const char *rule_str, filter_rule_t *rule_struct) {
const char *cur_pos = rule_str, *stage_begin_pos = rule_str;
filter_process_stage stage = FPS_SRC_NET;
while(1) {
switch(stage) {
case FPS_SRC_NET: {
if((*cur_pos >= '0' && *cur_pos <= '9') || *cur_pos == '.') {
; // Normal FPS_SRC_NET, next char
} else if(*cur_pos == '/') {
// FPS_SRC_NET finish, next is FPS_SRC_NET_BIT_LEN
rule_struct->key.src_net_cidr = get_int32_addr_from_ip_string(stage_begin_pos, cur_pos);
stage_begin_pos = cur_pos + 1;
stage = FPS_SRC_NET_BIT_LEN;
} else if(*cur_pos == ':') {
// FPS_SRC_NET finish, ignore FPS_SRC_NET_BIT_LEN(default 32), next is one of FPS_SRC_PORT_RANGE/FPS_SRC_PORT_SINGLE
rule_struct->key.src_net_cidr = get_int32_addr_from_ip_string(stage_begin_pos, cur_pos);
rule_struct->key.src_net_bit_len = 32;
stage_begin_pos = cur_pos + 1;
if(*(cur_pos + 1) == '[') {
stage = FPS_SRC_PORT_RANGE;
} else {
stage = FPS_SRC_PORT_SINGLE;
}
} else if(*cur_pos == ',') {
// FPS_SRC_NET finish, ignore FPS_SRC_NET_BIT_LEN(default 32), ignore FPS_SRC_PORT(default all),
// next is FPS_DST_NET
rule_struct->key.src_net_cidr = get_int32_addr_from_ip_string(stage_begin_pos, cur_pos);
rule_struct->key.src_net_bit_len = 32;
rule_struct->key.src_port_range.start_port = 0;
rule_struct->key.src_port_range.end_port = 65535;
stage_begin_pos = cur_pos + 1;
stage = FPS_DST_NET;
} else {
traceEvent(TRACE_WARNING, "process filter rule with error char %c at pos %d", *cur_pos, cur_pos - rule_str);
return 0;
}
break;
}
case FPS_SRC_NET_BIT_LEN: {
if((*cur_pos >= '0') && (*cur_pos <= '9')) {
; // Normal FPS_SRC_NET_BIT_LEN, next char
} else if(*cur_pos == ':') {
// FPS_SRC_NET_BIT_LEN finish, next is one of FPS_SRC_PORT_RANGE/FPS_SRC_PORT_SINGLE
rule_struct->key.src_net_bit_len = get_int32_from_number_string(stage_begin_pos, cur_pos);
stage_begin_pos = cur_pos + 1;
if(*(cur_pos + 1) == '[') {
stage = FPS_SRC_PORT_RANGE;
} else {
stage = FPS_SRC_PORT_SINGLE;
}
} else if(*cur_pos == ',') {
// FPS_SRC_NET_BIT_LEN finish, ignore FPS_SRC_PORT(default all), next is FPS_DST_NET
rule_struct->key.src_net_bit_len = get_int32_from_number_string(stage_begin_pos, cur_pos);;
rule_struct->key.src_port_range.start_port = 0;
rule_struct->key.src_port_range.end_port = 65535;
stage_begin_pos = cur_pos + 1;
stage = FPS_DST_NET;
} else {
traceEvent(TRACE_WARNING, "process filter rule with error char %c at pos %d", *cur_pos, cur_pos - rule_str);
return 0;
}
break;
}
case FPS_SRC_PORT_SINGLE: {
if((*cur_pos >= '0') && (*cur_pos <= '9')) {
; // Normal FPS_SRC_PORT_SINGLE, next char
} else if(*cur_pos == ',') {
// FPS_SRC_PORT_SINGLE finish, next is FPS_DST_NET
rule_struct->key.src_port_range.start_port = get_int32_from_number_string(stage_begin_pos, cur_pos);
rule_struct->key.src_port_range.end_port = rule_struct->key.src_port_range.start_port;
stage_begin_pos = cur_pos + 1;
stage = FPS_DST_NET;
} else {
traceEvent(TRACE_WARNING, "process filter rule with error char %c at pos %d", *cur_pos, cur_pos - rule_str);
return 0;
}
break;
}
case FPS_SRC_PORT_RANGE: {
if(*cur_pos == '[') {
stage_begin_pos = cur_pos + 1;
stage = FPS_SRC_PORT_START;
} else {
traceEvent(TRACE_WARNING, "process filter rule with error char %c at pos %d", *cur_pos, cur_pos - rule_str);
return 0;
}
break;
}
case FPS_SRC_PORT_START: {
if((*cur_pos >= '0') && (*cur_pos <= '9')) {
; // Normal FPS_SRC_PORT_START, next char
} else if(*cur_pos == ',') {
// FPS_SRC_PORT_START finish, next is FPS_SRC_PORT_END
rule_struct->key.src_port_range.start_port = get_int32_from_number_string(stage_begin_pos, cur_pos);
stage_begin_pos = cur_pos + 1;
stage = FPS_SRC_PORT_END;
} else {
traceEvent(TRACE_WARNING, "process filter rule with error char %c at pos %d", *cur_pos, cur_pos - rule_str);
return 0;
}
break;
}
case FPS_SRC_PORT_END: {
if((*cur_pos >= '0') && (*cur_pos <= '9')) {
; // Normal FPS_SRC_PORT_END, next char
} else if((*cur_pos == ']') && (*(cur_pos + 1) == ',')) {
// FPS_SRC_PORT_END finish, next is FPS_DST_NET
rule_struct->key.src_port_range.end_port = get_int32_from_number_string(stage_begin_pos, cur_pos);
stage_begin_pos = cur_pos + 2;
stage = FPS_DST_NET;
++cur_pos; //skip next char ','
} else {
traceEvent(TRACE_WARNING, "process filter rule with error char %c at pos %d", *cur_pos, cur_pos - rule_str);
return 0;
}
break;
}
case FPS_DST_NET: {
if((*cur_pos >= '0' && *cur_pos <= '9') || *cur_pos == '.') {
; // Normal FPS_DST_NET, next char
} else if(*cur_pos == '/') {
// FPS_DST_NET finish, next is FPS_DST_NET_BIT_LEN
rule_struct->key.dst_net_cidr = get_int32_addr_from_ip_string(stage_begin_pos, cur_pos);
stage_begin_pos = cur_pos + 1;
stage = FPS_DST_NET_BIT_LEN;
} else if(*cur_pos == ':') {
// FPS_DST_NET finish, ignore FPS_DST_NET_BIT_LEN(default 32), next is one of FPS_DST_PORT_RANGE/FPS_DST_PORT_SINGLE
rule_struct->key.dst_net_cidr = get_int32_addr_from_ip_string(stage_begin_pos, cur_pos);
rule_struct->key.dst_net_bit_len = 32;
stage_begin_pos = cur_pos + 1;
if(*(cur_pos + 1) == '[') {
stage = FPS_DST_PORT_RANGE;
} else {
stage = FPS_DST_PORT_SINGLE;
}
} else if((*cur_pos == ',') || (*cur_pos == 0)) {
// FPS_DST_NET finish, ignore FPS_DST_NET_BIT_LEN(default 32), ignore FPS_DST_PORT(default all),
// next is FPS_PROTO
rule_struct->key.dst_net_cidr = get_int32_addr_from_ip_string(stage_begin_pos, cur_pos);
rule_struct->key.dst_net_bit_len = 32;
rule_struct->key.dst_port_range.start_port = 0;
rule_struct->key.dst_port_range.end_port = 65535;
stage_begin_pos = cur_pos + 1;
stage = FPS_PROTO;
} else {
traceEvent(TRACE_WARNING, "process filter rule with error char %c at pos %d", *cur_pos, cur_pos - rule_str);
return 0;
}
break;
}
case FPS_DST_NET_BIT_LEN: {
if((*cur_pos >= '0') && (*cur_pos <= '9')) {
; // Normal FPS_DST_NET_BIT_LEN, next char
} else if(*cur_pos == ':') {
// FPS_DST_NET_BIT_LEN finish, next is one of FPS_DST_PORT_RANGE/FPS_DST_PORT_SINGLE
rule_struct->key.dst_net_bit_len = get_int32_from_number_string(stage_begin_pos, cur_pos);
stage_begin_pos = cur_pos + 1;
if(*(cur_pos + 1) == '[') {
stage = FPS_DST_PORT_RANGE;
} else {
stage = FPS_DST_PORT_SINGLE;
}
} else if((*cur_pos == ',') || (*cur_pos == 0)) {
// FPS_DST_NET_BIT_LEN finish, ignore FPS_DST_PORT(default all), next is FPS_PROTO
rule_struct->key.dst_net_bit_len = get_int32_from_number_string(stage_begin_pos, cur_pos);;
rule_struct->key.dst_port_range.start_port = 0;
rule_struct->key.dst_port_range.end_port = 65535;
stage_begin_pos = cur_pos + 1;
stage = FPS_PROTO;
} else {
traceEvent(TRACE_WARNING, "process filter rule with error char %c at pos %d", *cur_pos, cur_pos - rule_str);
return 0;
}
break;
}
case FPS_DST_PORT_SINGLE: {
if((*cur_pos >= '0') && (*cur_pos <= '9')) {
; // Normal FPS_DST_PORT_SINGLE, next char
} else if((*cur_pos == ',') || (*cur_pos == 0)) {
// FPS_DST_PORT_SINGLE finish, next is FPS_PROTO
rule_struct->key.dst_port_range.start_port = get_int32_from_number_string(stage_begin_pos, cur_pos);
rule_struct->key.dst_port_range.end_port = rule_struct->key.dst_port_range.start_port;
stage_begin_pos = cur_pos + 1;
stage = FPS_PROTO;
} else {
traceEvent(TRACE_WARNING, "process filter rule with error char %c at pos %d", *cur_pos, cur_pos - rule_str);
return 0;
}
break;
}
case FPS_DST_PORT_RANGE: {
if(*cur_pos == '[') {
stage_begin_pos = cur_pos + 1;
stage = FPS_DST_PORT_START;
} else {
traceEvent(TRACE_WARNING, "process filter rule with error char %c at pos %d", *cur_pos, cur_pos - rule_str);
return 0;
}
break;
}
case FPS_DST_PORT_START: {
if((*cur_pos >= '0') && (*cur_pos <= '9')) {
; // Normal FPS_DST_PORT_START, next char
} else if(*cur_pos == ',') {
// FPS_DST_PORT_START finish, next is FPS_DST_PORT_END
rule_struct->key.dst_port_range.start_port = get_int32_from_number_string(stage_begin_pos, cur_pos);
stage_begin_pos = cur_pos + 1;
stage = FPS_DST_PORT_END;
} else {
traceEvent(TRACE_WARNING, "process filter rule with error char %c at pos %d", *cur_pos, cur_pos - rule_str);
return 0;
}
break;
}
case FPS_DST_PORT_END: {
if((*cur_pos >= '0') && (*cur_pos <= '9')) {
; // Normal FPS_DST_PORT_END, next char
} else if(*cur_pos == ']') {
// FPS_DST_PORT_END finish, next is FPS_PROTO
rule_struct->key.dst_port_range.end_port = get_int32_from_number_string(stage_begin_pos, cur_pos);
stage = FPS_PROTO;
if(*(cur_pos + 1) == ',') {
stage_begin_pos = cur_pos + 2;
++cur_pos; //skip next char ','
} else if(*(cur_pos + 1) != 0) {
traceEvent(TRACE_WARNING, "process filter rule with error char %c at pos %d", *cur_pos, cur_pos - rule_str);
return 0;
}
} else {
traceEvent(TRACE_WARNING, "process filter rule with error char %c at pos %d", *cur_pos, cur_pos - rule_str);
return 0;
}
break;
}
case FPS_PROTO: {
if((*cur_pos != '-') && (*cur_pos != '+') && (*cur_pos != ',')) {
; // Normal FPS_PROTO. next char
} else if(*cur_pos != ',') {
process_traffic_filter_proto(stage_begin_pos, cur_pos + 1, rule_struct);
if(*(cur_pos+1) == 0) { // end of whole rule string
break;
} else { // new proto info, and skip next char ','
stage_begin_pos = cur_pos + 2;
++cur_pos;
}
} else {
traceEvent(TRACE_WARNING, "Internal Error: ',' should skiped", *cur_pos, cur_pos - rule_str);
return 0;
}
break;
}
}
if(0 == *cur_pos) {
break;
}
++cur_pos;
}
return 1;
}
Reference in New Issue View Git Blame Copy Permalink