void scamper_icmp_resp_handle(scamper_icmp_resp_t *resp)
{
scamper_task_sig_t sig;
scamper_task_t *task;
scamper_addr_t addr;
if(SCAMPER_ICMP_RESP_IS_TTL_EXP(resp) ||
SCAMPER_ICMP_RESP_IS_UNREACH(resp) ||
SCAMPER_ICMP_RESP_IS_PACKET_TOO_BIG(resp))
{
/* the probe signature is embedded in the response */
if(!SCAMPER_ICMP_RESP_INNER_IS_SET(resp))
return;
if(scamper_icmp_resp_inner_dst(resp, &addr) != 0)
return;
}
else if(SCAMPER_ICMP_RESP_IS_ECHO_REPLY(resp) ||
SCAMPER_ICMP_RESP_IS_TIME_REPLY(resp))
{
/* the probe signature is an ICMP echo/ts request */
if(scamper_icmp_resp_src(resp, &addr) != 0)
return;
}
else
{
return;
}
memset(&sig, 0, sizeof(sig));
sig.sig_type = SCAMPER_TASK_SIG_TYPE_TX_IP;
sig.sig_tx_ip_dst = &addr;
if((task = scamper_task_find(&sig)) != NULL)
scamper_task_handleicmp(task, resp);
return;
}
/*
* scamper_task_sig_block
*
* go through the signatures and see if any conflict with other tasks.
* if there is a conflict, return the task, otherwise return NULL.
* scamper_task_sig_install assumes that this function has been called.
*/
scamper_task_t *scamper_task_sig_block(scamper_task_t *task)
{
scamper_task_sig_t *sig;
scamper_task_t *tf;
slist_node_t *n;
s2t_t *s2t;
for(n=slist_head_node(task->siglist); n != NULL; n = slist_node_next(n))
{
s2t = slist_node_item(n); sig = s2t->sig;
if((tf = scamper_task_find(sig)) != NULL && tf != task)
return tf;
}
return NULL;
}
int scamper_task_sig_install(scamper_task_t *task)
{
scamper_task_sig_t *sig;
scamper_task_t *tf;
s2t_t *s2t;
slist_node_t *n;
if(slist_count(task->siglist) < 1)
return -1;
for(n=slist_head_node(task->siglist); n != NULL; n = slist_node_next(n))
{
s2t = slist_node_item(n); sig = s2t->sig;
/* check if another task has this signature already */
if((tf = scamper_task_find(sig)) != NULL)
{
if(tf != task)
goto err;
continue;
}
if(sig->sig_type == SCAMPER_TASK_SIG_TYPE_TX_IP)
s2t->node = splaytree_insert(tx_ip, s2t);
else if(sig->sig_type == SCAMPER_TASK_SIG_TYPE_TX_ND)
s2t->node = splaytree_insert(tx_nd, s2t);
else if(sig->sig_type == SCAMPER_TASK_SIG_TYPE_SNIFF)
s2t->node = dlist_tail_push(sniff, s2t);
if(s2t->node == NULL)
{
scamper_debug(__func__, "could not install sig");
goto err;
}
}
return 0;
err:
scamper_task_sig_deinstall(task);
return -1;
}
