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mongoose/test/mip_test.c
Sergio R. Caprile 91606a9e3f improve MIP tests
2024-07-22 20:22:29 -03:00

318 lines
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C
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#define MG_ENABLE_TCPIP 1
#define MG_ENABLE_TCPIP_DRIVER_INIT 0
#include "mongoose.c"
#include "driver_mock.c"
static int s_num_tests = 0;
static bool s_sent_fragment = 0;
static int s_seg_sent = 0;
#define ASSERT(expr) \
do { \
s_num_tests++; \
if (!(expr)) { \
printf("FAILURE %s:%d: %s\n", __FILE__, __LINE__, #expr); \
abort(); \
} \
} while (0)
static void test_statechange(void) {
char tx[1540];
struct mg_tcpip_if iface;
memset(&iface, 0, sizeof(iface));
iface.ip = mg_htonl(0x01020304);
iface.state = MG_TCPIP_STATE_READY;
iface.tx.buf = tx, iface.tx.len = sizeof(tx);
iface.driver = &mg_tcpip_driver_mock;
onstatechange(&iface);
}
static void ph(struct mg_connection *c, int ev, void *ev_data) {
if (ev == MG_EV_POLL) ++(*(int *) c->fn_data);
(void) c, (void) ev_data;
}
static void fn(struct mg_connection *c, int ev, void *ev_data) {
(void) c, (void) ev, (void) ev_data;
}
static void frag_recv_fn(struct mg_connection *c, int ev, void *ev_data) {
if (ev == MG_EV_ERROR) {
if (s_sent_fragment) {
ASSERT(strcmp((char*) ev_data, "Received fragmented packet") == 0);
}
}
(void) c, (void) ev_data;
}
static void frag_send_fn(struct mg_connection *c, int ev, void *ev_data) {
static bool s_sent;
static int s_seg_sizes[] = {416, 416, 368};
if (ev == MG_EV_POLL) {
if (!s_sent) {
c->send.len = 1200; // setting TCP payload size
s_sent = true;
}
} else if (ev == MG_EV_WRITE) {
// Checking TCP segment sizes (ev_data points to the TCP payload length)
ASSERT(*(int *) ev_data == s_seg_sizes[s_seg_sent++]);
}
(void) c, (void) ev_data;
}
static void test_poll(void) {
int count = 0, i;
struct mg_mgr mgr;
mg_mgr_init(&mgr);
struct mg_tcpip_if mif;
memset(&mif, 0, sizeof(mif));
mif.driver = &mg_tcpip_driver_mock;
mg_tcpip_init(&mgr, &mif);
mg_http_listen(&mgr, "http://127.0.0.1:12346", ph, &count);
for (i = 0; i < 10; i++) mg_mgr_poll(&mgr, 0);
ASSERT(count == 10);
mg_tcpip_free(&mif);
mg_mgr_free(&mgr);
}
#define DRIVER_BUF_SIZE 1540
struct driver_data {
char buf[DRIVER_BUF_SIZE];
size_t len;
bool tx_ready; // data can be read from tx
};
static struct driver_data s_driver_data;
static size_t if_tx(const void *buf, size_t len, struct mg_tcpip_if *ifp) {
struct driver_data *driver_data = (struct driver_data *) ifp->driver_data;
if (len > DRIVER_BUF_SIZE) len = DRIVER_BUF_SIZE;
driver_data->len = len;
memcpy(driver_data->buf, buf, len);
driver_data->tx_ready = true;
return len;
}
static bool if_up(struct mg_tcpip_if *ifp) {
return ifp->driver_data ? true : false;
}
static size_t if_rx(void *buf, size_t len, struct mg_tcpip_if *ifp) {
struct driver_data *driver_data = (struct driver_data *) ifp->driver_data;
if (!driver_data->len) return 0;
if (len > driver_data->len) len = driver_data->len;
memcpy(buf, driver_data->buf, len);
driver_data->len = 0; // cleaning up the buffer
return len;
}
static bool received_response(struct driver_data *driver) {
bool was_ready = driver->tx_ready;
driver->tx_ready = false;
return was_ready;
}
static void create_tcp_pkt(struct eth *e, struct ip *ip, uint32_t seq,
uint32_t ack, uint8_t flags, size_t payload_len) {
struct tcp t;
memset(&t, 0, sizeof(struct tcp));
t.flags = flags;
t.seq = mg_htonl(seq);
t.ack = mg_htonl(ack);
t.off = 5 << 4;
memcpy(s_driver_data.buf, e, sizeof(*e));
memcpy(s_driver_data.buf + sizeof(*e), ip, sizeof(*ip));
memcpy(s_driver_data.buf + sizeof(*e) + sizeof(*ip), &t, sizeof(struct tcp));
s_driver_data.len = sizeof(*e) + sizeof(*ip)
+ sizeof(struct tcp) + payload_len;
}
static void init_tcp_handshake(struct eth *e, struct ip *ip, struct tcp *tcp,
struct mg_mgr *mgr) {
// SYN
create_tcp_pkt(e, ip, 1000, 0, TH_SYN | TH_ACK, 0);
mg_mgr_poll(mgr, 0);
// SYN-ACK
while(!received_response(&s_driver_data)) mg_mgr_poll(mgr, 0);
tcp = (struct tcp *) (s_driver_data.buf + sizeof(struct eth) +
sizeof(struct ip));
ASSERT((tcp->flags == (TH_SYN | TH_ACK)));
ASSERT((tcp->ack == mg_htonl(1001)));
// ACK
create_tcp_pkt(e, ip, 1001, 1, TH_ACK, 0);
mg_mgr_poll(mgr, 0);
}
static void test_retransmit(void) {
struct mg_mgr mgr;
struct eth e;
struct ip ip;
struct tcp *t = NULL;
uint64_t start, now;
bool response_recv = true;
struct mg_tcpip_driver driver;
struct mg_tcpip_if mif;
mg_mgr_init(&mgr);
memset(&mif, 0, sizeof(mif));
memset(&s_driver_data, 0, sizeof(struct driver_data));
driver.init = NULL, driver.tx = if_tx, driver.up = if_up, driver.rx = if_rx;
mif.driver = &driver;
mif.driver_data = &s_driver_data;
mg_tcpip_init(&mgr, &mif);
mg_http_listen(&mgr, "http://0.0.0.0:0", fn, NULL);
mgr.conns->pfn = NULL; // HTTP handler not needed
mg_mgr_poll(&mgr, 0);
// setting the Ethernet header
memset(&e, 0, sizeof(e));
memcpy(e.dst, mif.mac, 6 * sizeof(uint8_t));
e.type = mg_htons(0x800);
// setting the IP header
memset(&ip, 0, sizeof(ip));
ip.ver = 4 << 4, ip.proto = 6;
ip.len = mg_htons(sizeof(ip) + sizeof(struct tcp));
init_tcp_handshake(&e, &ip, t, &mgr);
// packet with seq_no = 1001
ip.len =
mg_htons(sizeof(struct ip) + sizeof(struct tcp) + /* TCP Payload */ 1);
create_tcp_pkt(&e, &ip, 1001, 1, TH_PUSH | TH_ACK, 1);
mg_mgr_poll(&mgr, 0);
while(!received_response(&s_driver_data)) mg_mgr_poll(&mgr, 0);
t = (struct tcp *) (s_driver_data.buf + sizeof(struct eth) +
sizeof(struct ip));
ASSERT((t->flags == TH_ACK));
ASSERT((t->ack == mg_htonl(1002))); // OK
// resend packet with seq_no = 1001 (e.g.: MIP ACK lost)
create_tcp_pkt(&e, &ip, 1001, 1, TH_PUSH | TH_ACK, 1);
mg_mgr_poll(&mgr, 0);
start = mg_millis();
while(!received_response(&s_driver_data)) {
mg_mgr_poll(&mgr, 0);
now = mg_millis() - start;
// we wait enough time for a reply
if (now > 2 * MIP_TCP_ACK_MS) {
response_recv = false;
break;
}
}
ASSERT((!response_recv)); // replies should not be sent for duplicate packets
// packet with seq_no = 1002 got lost/delayed, send seq_no = 1003
create_tcp_pkt(&e, &ip, 1003, 1, TH_PUSH | TH_ACK, 1);
mg_mgr_poll(&mgr, 0);
start = mg_millis();
while(!received_response(&s_driver_data)) {
mg_mgr_poll(&mgr, 0);
now = mg_millis() - start;
if (now > 2 * MIP_TCP_ACK_MS)
ASSERT(0); // response should have been received by now
}
t = (struct tcp *) (s_driver_data.buf + sizeof(struct eth) +
sizeof(struct ip));
ASSERT((t->flags == TH_ACK));
ASSERT((t->ack == mg_htonl(1002))); // dup ACK
// retransmitting packet with seq_no = 1002
create_tcp_pkt(&e, &ip, 1002, 1, TH_PUSH | TH_ACK, 1);
mg_mgr_poll(&mgr, 0);
while(!received_response(&s_driver_data)) mg_mgr_poll(&mgr, 0);
t = (struct tcp *) (s_driver_data.buf + sizeof(struct eth) +
sizeof(struct ip));
ASSERT((t->flags == TH_ACK));
ASSERT((t->ack == mg_htonl(1003))); // OK
s_driver_data.len = 0;
mg_mgr_free(&mgr);
mg_tcpip_free(&mif);
}
static void test_frag_recv_path(void) {
struct mg_mgr mgr;
struct eth e;
struct ip ip;
struct tcp *t = NULL;
struct mg_tcpip_driver driver;
struct mg_tcpip_if mif;
mg_mgr_init(&mgr);
memset(&mif, 0, sizeof(mif));
memset(&s_driver_data, 0, sizeof(struct driver_data));
driver.init = NULL, driver.tx = if_tx, driver.up = if_up, driver.rx = if_rx;
mif.driver = &driver;
mif.driver_data = &s_driver_data;
mg_tcpip_init(&mgr, &mif);
mg_http_listen(&mgr, "http://0.0.0.0:0", frag_recv_fn, NULL);
mgr.conns->pfn = NULL;
mg_mgr_poll(&mgr, 0);
// setting the Ethernet header
memset(&e, 0, sizeof(e));
memcpy(e.dst, mif.mac, 6 * sizeof(uint8_t));
e.type = mg_htons(0x800);
// setting the IP header
memset(&ip, 0, sizeof(ip));
ip.ver = 0x45, ip.proto = 6;
ip.len = mg_htons(sizeof(ip) + sizeof(struct tcp));
init_tcp_handshake(&e, &ip, t, &mgr);
// send fragmented TCP packet
ip.len =
mg_htons(sizeof(struct ip) + sizeof(struct tcp) + 1000);
ip.frag |= IP_MORE_FRAGS_MSK; // setting More Fragments bit to 1
create_tcp_pkt(&e, &ip, 1001, 1, TH_PUSH | TH_ACK, 1000);
s_sent_fragment = true;
mg_mgr_poll(&mgr, 0);
s_driver_data.len = 0;
mg_mgr_free(&mgr);
mg_tcpip_free(&mif);
}
static void test_frag_send_path(void) {
struct mg_mgr mgr;
struct mg_tcpip_driver driver;
struct mg_tcpip_if mif;
mg_mgr_init(&mgr);
memset(&mif, 0, sizeof(mif));
memset(&s_driver_data, 0, sizeof(struct driver_data));
driver.init = NULL, driver.tx = if_tx, driver.up = if_up, driver.rx = if_rx;
mif.driver = &driver;
mif.driver_data = &s_driver_data;
mg_tcpip_init(&mgr, &mif);
mif.mtu = 500;
mg_http_listen(&mgr, "http://0.0.0.0:0", frag_send_fn, NULL);
mgr.conns->pfn = NULL;
for (int i = 0; i < 10; i++)
mg_mgr_poll(&mgr, 0);
ASSERT(s_seg_sent == 3);
s_driver_data.len = 0;
mg_mgr_free(&mgr);
mg_tcpip_free(&mif);
}
static void test_fragmentation(void) {
test_frag_recv_path();
test_frag_send_path();
}
int main(void) {
test_statechange();
test_poll();
test_retransmit();
test_fragmentation();
printf("SUCCESS. Total tests: %d\n", s_num_tests);
return 0;
}
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