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#include <stdlib.h> // malloc
#include <stdio.h> // perror
#include <string.h> // memcpy
#include "address.h"
#include "pt_loop.h"
#include "probe.h"
#include "algorithm.h"
#include "algorithms/traceroute.h"
/**
* \brief Handle events raised in the main loop
* \param loop The main loop.
* \param event The handled event.
* \param user_data Data shared in pt_loop_create()
*/
void loop_handler(pt_loop_t * loop, event_t * event, void * user_data)
{
traceroute_event_t * traceroute_event;
const traceroute_options_t * traceroute_options;
const traceroute_data_t * traceroute_data;
const char * algorithm_name;
switch (event->type) {
case ALGORITHM_HAS_TERMINATED:
printf("> ALGORITHM_TERMINATED\n");
pt_stop_instance(loop, event->issuer); // release traceroute's data from the memory
pt_loop_terminate(loop); // we've only run one 'traceroute' algorithm, so we can break the main loop
break;
case ALGORITHM_EVENT: // a traceroute-specific event has been raised
algorithm_name = event->issuer->algorithm->name;
if (strcmp(algorithm_name, "traceroute") == 0) {
traceroute_event = event->data;
traceroute_options = event->issuer->options;
traceroute_data = event->issuer->data;
traceroute_handler(loop, traceroute_event, traceroute_options, traceroute_data);
}
break;
default:
break;
}
// Release the event, its nested traceroute_event (if any), its attached probe and reply (if any)
//event_free(event); // TODO this may provoke seg fault in case of stars
}
/**
* \brief Main program
* \param argc Number of arguments
* \param argv Array of arguments
* \return Execution code
*/
int main(int argc, char ** argv)
{
algorithm_instance_t * instance;
traceroute_options_t options = traceroute_get_default_options();
probe_t * probe;
pt_loop_t * loop;
int family;
int ret = EXIT_FAILURE;
const char * ip_protocol_name;
const char * protocol_name;
address_t dst_addr;
// Harcoded command line parsing here
char dst_ip[] = "8.8.8.8";
//char dst_ip[] = "1.1.1.2";
//char dst_ip[] = "2001:db8:85a3::8a2e:370:7338";
if (!address_guess_family(dst_ip, &family)) {
fprintf(stderr, "Cannot guess family of destination address (%s)", dst_ip);
goto ERR_ADDRESS_GUESS_FAMILY;
}
if (address_from_string(family, dst_ip, &dst_addr) != 0) {
fprintf(stderr, "Cannot guess family of destination address (%s)", dst_ip);
goto ERR_ADDRESS_FROM_STRING;
}
// Prepare options related to the 'traceroute' algorithm
options.do_resolv = false;
options.dst_addr = &dst_addr;
options.num_probes = 1;
// options.max_ttl = 1;
printf("num_probes = %zu max_ttl = %u\n", options.num_probes, options.max_ttl);
// Create libparistraceroute loop
// No information shared by traceroute algorithm instances, so we pass NULL
if (!(loop = pt_loop_create(loop_handler, NULL))) {
fprintf(stderr, "Cannot create libparistraceroute loop");
goto ERR_LOOP_CREATE;
}
// Probe skeleton definition: IPv4/UDP probe targetting 'dst_ip'
if (!(probe = probe_create())) {
fprintf(stderr, "Cannot create probe skeleton");
goto ERR_PROBE_CREATE;
}
switch (family) {
case AF_INET:
ip_protocol_name = "ipv4";
protocol_name = "icmpv4";
break;
case AF_INET6:
ip_protocol_name = "ipv6";
protocol_name = "icmpv6";
break;
default:
fprintf(stderr, "Internet family not supported (%d)\n", family);
goto ERR_FAMILY;
}
// protocol_name = "udp";
protocol_name = "tcp";
printf("protocol_name = %s\n", protocol_name);
if (!probe_set_protocols(probe, ip_protocol_name, protocol_name, NULL)) {
fprintf(stderr, "Can't set protocols %s/%s\n", ip_protocol_name, protocol_name);
goto ERR_PROBE_SET_PROTOCOLS;
}
if (strncmp("icmp", protocol_name, 4) != 0) {
probe_write_payload(probe, "\0\0\0\0", 4);
} else {
probe_set_field(probe, I32("body", 1));
}
probe_set_fields(probe,
ADDRESS("dst_ip", &dst_addr),
I16("dst_port", 3000),
NULL
);
/*
if (strcmp("tcp", protocol_name) == 0) {
printf("setting tcp fields\n");
uint8_t one = 1;
probe_set_fields(probe,
BITS("reserved", 1, &one),
BITS("ns", 1, &one),
BITS("cwr", 1, &one),
BITS("ece", 1, &one),
BITS("urg", 1, &one),
BITS("ack", 1, &one),
BITS("psh", 1, &one),
BITS("rst", 1, &one),
BITS("syn", 1, &one),
BITS("fin", 1, &one),
NULL
);
}
*/
probe_dump(probe);
// Instanciate a 'traceroute' algorithm
if (!(instance = pt_add_instance(loop, "traceroute", &options, probe))) {
fprintf(stderr, "Cannot add 'traceroute' algorithm");
goto ERR_INSTANCE;
}
// Wait for events. They will be catched by handler_user()
if (pt_loop(loop, 0) < 0) {
fprintf(stderr, "Main loop interrupted");
goto ERR_IN_PT_LOOP;
}
ret = EXIT_SUCCESS;
// Free data and quit properly
ERR_IN_PT_LOOP:
// instance is freed by pt_loop_free
ERR_INSTANCE:
ERR_PROBE_SET_PROTOCOLS:
ERR_FAMILY:
probe_free(probe);
ERR_PROBE_CREATE:
pt_loop_free(loop);
ERR_LOOP_CREATE:
ERR_ADDRESS_FROM_STRING:
ERR_ADDRESS_GUESS_FAMILY:
exit(ret);
}
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