static void doconnect(void)
{
int fd = accept(sockfd, 0, 0);
if (fd < 0)
perror("accept");
else addport(fd);
}
/*
* passive_pcap4: This is the ipv4 pcap looper. It is like most pcap callbacks
* requires: all of the standard pcap_loop data
*/
static void passive_pcap4(u_char * args, const struct pcap_pkthdr *header,
const u_char * packet)
{
u_int sport;
u_int dport;
eth_hdr *ethernet; /* The ethernet header */
ip4ip *ip; /* The IP header */
struct protoent *proto;
const struct tcphdr4 *tcp; /* TCP Header */
/* Extract ethernet, ip and tcp headers */
ethernet = (eth_hdr *) (packet); /* Pointer to ethernet header */
ip = (ip4ip *) (packet + sizeof(eth_hdr));
tcp = (struct tcphdr4 *)(packet +
sizeof(struct ether_header) +
sizeof(struct ip));
if (ip->ip_v != 4)
return; /* don't try to do ipv6 yet */
dport = ntohs(tcp->th_dport); /* We only look at the dest port */
proto = getprotobynumber(ip->ip_p); /* Fetch the protocol string */
if ((dport <= 1024) || (xflag))
addport(inet_ntoa(ip->ip_dst), dport, proto->p_name);
}
void
makeports(Ruleset *rules[])
{
int i;
for(i=0; rules[i]; i++)
addport(rules[i]->port);
}
Ruleset*
readruleset(void)
{
Ruleset *rs;
Rule *r;
int eof, inrule, i, ncmd;
Again:
eof = 0;
rs = emalloc(sizeof(Ruleset));
rs->pat = emalloc(sizeof(Rule*));
rs->act = emalloc(sizeof(Rule*));
inrule = 0;
ncmd = 0;
for(;;){
r = readrule(&eof);
if(eof)
break;
if(r==nil){
if(inrule)
break;
continue;
}
inrule = 1;
switch(r->obj){
case OArg:
case OAttr:
case OData:
case ODst:
case OType:
case OWdir:
case OSrc:
rs->npat++;
rs->pat = erealloc(rs->pat, (rs->npat+1)*sizeof(Rule*));
rs->pat[rs->npat-1] = r;
rs->pat[rs->npat] = nil;
break;
case OPlumb:
rs->nact++;
rs->act = erealloc(rs->act, (rs->nact+1)*sizeof(Rule*));
rs->act[rs->nact-1] = r;
rs->act[rs->nact] = nil;
if(r->verb == VTo){
if(rs->npat>0 && rs->port != nil) /* npat==0 implies port declaration */
parseerror("too many ports");
if(lookup(r->qarg, badports) >= 0)
parseerror("illegal port name %s", r->qarg);
if(rs->port)
free(rs->port);
rs->port = estrdup(r->qarg);
}else
ncmd++; /* start or client rule */
break;
}
}
if(ncmd > 1){
freeruleset(rs);
parseerror("ruleset has more than one client or start action");
}
if(rs->npat>0 && rs->nact>0)
return rs;
if(rs->npat==0 && rs->nact==0){
freeruleset(rs);
return nil;
}
if(rs->nact==0 || rs->port==nil){
freeruleset(rs);
parseerror("ruleset must have patterns and actions");
return nil;
}
/* declare ports */
for(i=0; i<rs->nact; i++)
if(rs->act[i]->verb != VTo){
freeruleset(rs);
parseerror("ruleset must have actions");
return nil;
}
for(i=0; i<rs->nact; i++)
addport(rs->act[i]->qarg);
freeruleset(rs);
goto Again;
}