In flight connection pool cleaning

This commit is contained in:
William Robinet 2015-04-22 11:23:37 +02:00
parent 68255f5e9d
commit 4310c3f117
5 changed files with 68 additions and 5 deletions

View file

@ -87,6 +87,13 @@ RETSIGTYPE sig_handler PROTO_LIST((void));
void pcap_cb PROTO_LIST((u_char *ptr,struct pcap_pkthdr *hdr,u_char *data));
int main PROTO_LIST((int argc,char **argv));
int packet_cnt = 0; // Packet counter used for connection pool cleaning
int conn_freq = 100; // Number of packets after which a connection pool
// cleaning is performed
int conn_ttl = 100; // TTL of inactive connections in connection pool
struct timeval last_packet_seen_time; // Timestamp of the last packet of the
// last block of conn_freq packets seen
int err_exit(str,num)
char *str;
int num;
@ -128,7 +135,7 @@ void pcap_cb(ptr,hdr,data)
n_handler *n;
int len;
struct ether_header *e_hdr=(struct ether_header *)data;
int type;
int type, cleaned_conn;
n=(n_handler *)ptr;
if(hdr->caplen!=hdr->len) err_exit("Length mismatch",-1);
@ -231,6 +238,15 @@ void pcap_cb(ptr,hdr,data)
#endif
}
network_process_packet(n,&hdr->ts,data,len);
if(packet_cnt == conn_freq) {
packet_cnt = 0;
memcpy(&last_packet_seen_time,&hdr->ts,sizeof(struct timeval));
if(cleaned_conn = clean_old_conn())
printf("%d inactive connection(s) cleaned from connection pool\n", cleaned_conn);
} else {
packet_cnt++;
}
}
typedef struct module_def_ {
@ -277,7 +293,7 @@ int main(argc,argv)
signal(SIGINT,sig_handler);
while((c=getopt(argc,argv,"vr:f:S:yTtai:k:p:nsAxXhHVNdqem:P"))!=EOF){
while((c=getopt(argc,argv,"vr:F:f:S:yTt:ai:k:p:nsAxXhHVNdqem:P"))!=EOF){
switch(c){
case 'v':
print_version();
@ -319,6 +335,12 @@ int main(argc,argv)
case 'n':
NET_print_flags |= NET_PRINT_NO_RESOLVE;
break;
case 't':
conn_ttl=atoi(optarg);
break;
case 'F':
conn_freq=atoi(optarg);
break;
case 'm':
for(m=modules;m->name!=0;m++){
if(!strcmp(m->name,optarg)){
@ -428,6 +450,7 @@ int main(argc,argv)
if(NET_print_flags & NET_PRINT_TYPESET)
printf("\n.ps\n.fi\n");
printf("Cleaning %d remaining connection(s) from connection pool\n", destroy_all_conn());
exit(0);
}

View file

@ -59,6 +59,9 @@ int conn_number=1;
static conn_struct *first_conn=0;
extern struct timeval last_packet_seen_time;
extern int conn_ttl;
static int zero_conn PROTO_LIST((tcp_conn *conn));
static int zero_conn(conn)
@ -163,6 +166,33 @@ int tcp_destroy_conn(conn)
return(0);
}
int clean_old_conn() {
conn_struct *conn;
tcp_conn *tcpconn;
struct timeval dt;
int i = 0;
for(conn=first_conn;conn;conn=conn->next) {
i++;
tcpconn = &conn->conn;
timestamp_diff(&last_packet_seen_time, &tcpconn->last_seen_time, &dt);
if(dt.tv_sec > conn_ttl) {
tcp_destroy_conn(&(first_conn->conn));
}
}
return i;
}
int destroy_all_conn() {
conn_struct *conn;
int i = 0,r;
while(first_conn) {
i++;
tcp_destroy_conn(&first_conn->conn);
}
return i;
}
int free_tcp_segment_queue(seg)
segment *seg;
{

View file

@ -83,6 +83,7 @@ typedef struct tcp_conn_ {
stream_data r2i; /*The stream from responder to initiator*/
struct timeval start_time;
struct timeval last_seen_time;
proto_handler *analyzer; /*The analyzer to call with new data*/
struct conn_struct_ *backptr;
} tcp_conn;

View file

@ -108,6 +108,8 @@ int process_tcp_packet(handler,ctx,p)
stream=direction==DIR_R2I?&conn->r2i:&conn->i2r;
memcpy(&conn->last_seen_time,&p->ts,sizeof(struct timeval));
switch(conn->state){
case TCP_STATE_SYN1:
if(direction != DIR_R2I)
@ -182,6 +184,7 @@ static int new_connection(handler,ctx,p,connp)
conn->state=TCP_STATE_SYN1;
memcpy(&conn->start_time,&p->ts,sizeof(struct timeval));
memcpy(&conn->last_seen_time,&p->ts,sizeof(struct timeval));
if(r=create_proto_handler(handler,ctx,&conn->analyzer,conn,&p->ts))
ABORT(r);

View file

@ -181,6 +181,12 @@ Print the TCP headers.
.B \-v
Display version and copyright information.
.TP
.B \-t
Specify the TTL for inactive connections referenced in the connection pool (in seconds, default: 100).
.TP
.B \-F
Specify the number of packets after which a connection pool cleaning is performed (in packets, default: 100).
.TP
.B \-x
Print each record in hex, as well as decoding it.
.TP