// one sender thread
int send_run(sock_t st, shard_t *s)
{
log_trace("send", "send thread started");
pthread_mutex_lock(&send_mutex);
// Allocate a buffer to hold the outgoing packet
char buf[MAX_PACKET_SIZE];
memset(buf, 0, MAX_PACKET_SIZE);
// OS specific per-thread init
if (send_run_init(st)) {
return -1;
}
// MAC address length in characters
char mac_buf[(ETHER_ADDR_LEN * 2) + (ETHER_ADDR_LEN - 1) + 1];
char *p = mac_buf;
for(int i=0; i < ETHER_ADDR_LEN; i++) {
if (i == ETHER_ADDR_LEN-1) {
snprintf(p, 3, "%.2x", zconf.hw_mac[i]);
p += 2;
} else {
snprintf(p, 4, "%.2x:", zconf.hw_mac[i]);
p += 3;
}
}
log_debug("send", "source MAC address %s",
mac_buf);
void *probe_data;
if (zconf.probe_module->thread_initialize) {
zconf.probe_module->thread_initialize(buf, zconf.hw_mac, zconf.gw_mac,
zconf.target_port, &probe_data);
}
pthread_mutex_unlock(&send_mutex);
// adaptive timing to hit target rate
uint32_t count = 0;
uint32_t last_count = count;
double last_time = now();
uint32_t delay = 0;
int interval = 0;
uint32_t max_targets = s->state.max_targets;
volatile int vi;
if (zconf.rate > 0) {
// estimate initial rate
delay = 10000;
for (vi = delay; vi--; )
;
delay *= 1 / (now() - last_time) / (zconf.rate / zconf.senders);
interval = (zconf.rate / zconf.senders) / 20;
last_time = now();
}
uint32_t curr = shard_get_cur_ip(s);
int attempts = zconf.num_retries + 1;
uint32_t idx = 0;
while (1) {
// adaptive timing delay
if (delay > 0) {
count++;
for (vi = delay; vi--; )
;
if (!interval || (count % interval == 0)) {
double t = now();
delay *= (double)(count - last_count)
/ (t - last_time) / (zconf.rate / zconf.senders);
if (delay < 1)
delay = 1;
last_count = count;
last_time = t;
}
}
if (zrecv.complete) {
s->cb(s->id, s->arg);
break;
}
if (s->state.sent >= max_targets) {
s->cb(s->id, s->arg);
break;
}
if (zconf.max_runtime && zconf.max_runtime <= now() - zsend.start) {
s->cb(s->id, s->arg);
break;
}
if (curr == 0) {
s->cb(s->id, s->arg);
break;
}
s->state.sent++;
for (int i=0; i < zconf.packet_streams; i++) {
uint32_t src_ip = get_src_ip(curr, i);
uint32_t validation[VALIDATE_BYTES/sizeof(uint32_t)];
validate_gen(src_ip, curr, (uint8_t *)validation);
zconf.probe_module->make_packet(buf, src_ip, curr, validation, i, probe_data);
if (zconf.dryrun) {
lock_file(stdout);
zconf.probe_module->print_packet(stdout, buf);
unlock_file(stdout);
} else {
int length = zconf.probe_module->packet_length;
void *contents = buf + zconf.send_ip_pkts*sizeof(struct ether_header);
for (int i = 0; i < attempts; ++i) {
int rc = send_packet(st, contents, length, idx);
if (rc < 0) {
struct in_addr addr;
addr.s_addr = curr;
log_debug("send", "send_packet failed for %s. %s",
inet_ntoa(addr), strerror(errno));
s->state.failures++;
} else {
break;
}
}
idx++;
idx &= 0xFF;
}
}
curr = shard_get_next_ip(s);
}
if (zconf.dryrun) {
pthread_mutex_lock(&send_mutex);
fflush(stdout);
pthread_mutex_unlock(&send_mutex);
}
log_debug("send", "thread %hu finished", s->id);
return EXIT_SUCCESS;
}
// one sender thread
int send_run(int sock)
{
log_trace("send", "send thread started");
pthread_mutex_lock(&send_mutex);
// Allocate a buffer to hold the outgoing packet
char buf[MAX_PACKET_SIZE];
memset(buf, 0, MAX_PACKET_SIZE);
// OS specific per-thread init
if (send_run_init(sock)) {
return -1;
}
// Get the source hardware address, and give it to the probe
// module
if (get_iface_hw_addr(zconf.iface, zconf.hw_mac)) {
log_fatal("send", "could not retrieve hardware address for"
"interface: %s", zconf.iface);
return -1;
}
char mac_buf[(ETHER_ADDR_LEN * 2) + (ETHER_ADDR_LEN - 1) + 1];
char *p = mac_buf;
for(int i=0; i < ETHER_ADDR_LEN; i++) {
if (i == ETHER_ADDR_LEN-1) {
snprintf(p, 3, "%.2x", zconf.hw_mac[i]);
p += 2;
} else {
snprintf(p, 4, "%.2x:", zconf.hw_mac[i]);
p += 3;
}
}
log_debug("send", "source MAC address %s",
mac_buf);
zconf.probe_module->thread_initialize(buf, zconf.hw_mac, zconf.gw_mac,
zconf.target_port);
pthread_mutex_unlock(&send_mutex);
// adaptive timing to hit target rate
uint32_t count = 0;
uint32_t last_count = count;
double last_time = now();
uint32_t delay = 0;
int interval = 0;
volatile int vi;
if (zconf.rate > 0) {
// estimate initial rate
delay = 10000;
for (vi = delay; vi--; )
;
delay *= 1 / (now() - last_time) / (zconf.rate / zconf.senders);
interval = (zconf.rate / zconf.senders) / 20;
last_time = now();
}
while (1) {
// adaptive timing delay
if (delay > 0) {
count++;
for (vi = delay; vi--; )
;
if (!interval || (count % interval == 0)) {
double t = now();
delay *= (double)(count - last_count)
/ (t - last_time) / (zconf.rate / zconf.senders);
if (delay < 1)
delay = 1;
last_count = count;
last_time = t;
}
}
// generate next ip from cyclic group and update global state
// (everything locked happens here)
pthread_mutex_lock(&send_mutex);
if (zsend.complete) {
pthread_mutex_unlock(&send_mutex);
break;
}
if (zsend.sent >= zconf.max_targets) {
zsend.complete = 1;
zsend.finish = now();
pthread_mutex_unlock(&send_mutex);
break;
}
if (zconf.max_runtime && zconf.max_runtime <= now() - zsend.start) {
zsend.complete = 1;
zsend.finish = now();
pthread_mutex_unlock(&send_mutex);
break;
}
uint32_t curr = cyclic_get_next_ip(c);
if (curr == zsend.first_scanned) {
zsend.complete = 1;
zsend.finish = now();
}
zsend.sent++;
pthread_mutex_unlock(&send_mutex);
for (int i=0; i < zconf.packet_streams; i++) {
uint32_t src_ip = get_src_ip(curr, i);
uint32_t validation[VALIDATE_BYTES/sizeof(uint32_t)];
validate_gen(src_ip, curr, (uint8_t *)validation);
zconf.probe_module->make_packet(buf, src_ip, curr, validation, i);
if (zconf.dryrun) {
zconf.probe_module->print_packet(stdout, buf);
} else {
int length = zconf.probe_module->packet_length;
void *contents = buf + zconf.send_ip_pkts*sizeof(struct ether_header);
int rc = send_packet(sock, contents, length);
if (rc < 0) {
struct in_addr addr;
addr.s_addr = curr;
log_debug("send", "send_packet failed for %s. %s",
inet_ntoa(addr), strerror(errno));
pthread_mutex_lock(&send_mutex);
zsend.sendto_failures++;
pthread_mutex_unlock(&send_mutex);
}
}
}
}
cyclic_free(c);
log_debug("send", "thread finished");
return EXIT_SUCCESS;
}
