void pkt_to_nowhere(void)
{
sock *Conn = s_malloc(sizeof(sock));
pkt *Pkt = pkt_alloc(500);
uint32_t len = sizeof(Conn->local);
Conn->sock = s_socket(SOCK_DOMAIN, SOCK_TYPE, DEFAULT_PROTOCOL);
Conn->local.sin_family = SOCK_DOMAIN;
Conn->local.sin_addr.s_addr = htonl(INADDR_ANY); //???
Conn->local.sin_port = htons(DEFAULT_PORT);
s_bind(Conn->sock, (struct sockaddr *)&(Conn->local),
sizeof(Conn->local));
s_getsockname(Conn->sock, (struct sockaddr *)&(Conn->local),
(socklen_t *)&len);
create_pkt(Pkt, 0, 0, NULL, 0);
send_pkt(Pkt, Conn->sock, Conn->local);
shutdown(Conn->sock, SHUT_RDWR);
free(Conn);
}
//DOES NOT APPROPRIATELY MAKE A PACKET YET
void file_fill_frame(window *Window, file *File, uint32_t seq)
{
static uint8_t data[MAX_BUFF_SIZE];
frame *Frame = Window->Frame[get_frame_num(Window, seq)];
uint32_t data_len = s_fread(data, sizeof(uint8_t), Window->buffsize, File->fp);
if (data_len == 0)
Frame->state = FRAME_EMPTY;
else
{
create_pkt(Frame->Pkt, DATA, seq, data, data_len);
Frame->state = FRAME_FULL;
}
printf("Pkt data_len %u\n", data_len);
if (feof(File->fp))
Window->eof = TRUE;
if (Window->eof)
printf("File is now at EOF\n");
}
void
test_case(uint16_t payload_sz, uint8_t *ip_opt, int ip_opt_size, custom_opt_t *opt,
uint16_t expected_opt_len)
{
pkt_t *pkt;
error_t err;
ip_t *new_ip;
ip_t *ip;
uint16_t new_hdr_len;
int res;
uint16_t old_csum;
uint16_t old_len;
uint16_t old_hdr_len;
uint16_t new_len;
pkt_t *copy;
uint8_t *pay1, *pay2;
LOG("Test case : creating packet, appending IP option\n");
pkt = create_pkt(payload_sz, ip_opt, ip_opt_size);
ip = (ip_t *)pkt->msg;
old_hdr_len = ip->ip_hl * 4;
old_csum = ip->ip_sum;
old_len = ntohs(ip->ip_len);
copy = copy_pkt(pkt);
res = ip_add_custom_option(pkt, opt, &err);
if (res) {
LOG_ERR("Test Case failed with %d\n", res);
free(pkt);
return;
}
LOG("Test case : checking new header len\n");
new_ip = (ip_t *)pkt->msg;
new_hdr_len = new_ip->ip_hl * 4;
LOG("New hdr len : %d\n", new_hdr_len);
if (new_hdr_len <= MIN_IP_SIZE) {
LOG_ERR("Test Case failed, expecting bigger header size");
LOG_ERR("Recieved header size %d\n", new_hdr_len);
free(pkt);
return;
}
LOG("Test case : testing new packet len\n");
new_len = payload_sz + MIN_IP_SIZE + expected_opt_len;
if (ntohs(new_ip->ip_len) != new_len) {
LOG_ERR("Test case failed, incorrect packet len\n");
LOG_ERR("Expected %d, Recvd %d\n", new_len, ntohs(new_ip->ip_len));
free(pkt);
return;
}
LOG("Test case : checking ip checksum\n");
if (old_csum == new_ip->ip_sum) {
LOG_ERR("Test case failed, expecting a different checksum\n");
free(pkt);
return;
}
LOG("Test case : comparing payload\n");
pay1 = (uint8_t *)copy->msg + MIN_IP_SIZE + ip_opt_size;
pay2 = (uint8_t *)new_ip + new_hdr_len;
if (compare_payload(pay1, pay2, payload_sz)) {
LOG_ERR("Test case failed, payloads didn't match\n");
free(pkt);
return;
}
LOG("Test case : remove option\n");
res = ip_remove_custom_option(pkt, opt, &err);
if (res) {
LOG_ERR("Test case failed, remove option failed with %d\n", res);
free(pkt);
return;
}
LOG("Test case : comparing packet len after removing options\n");
new_ip = (ip_t *)pkt->msg;
new_hdr_len = new_ip->ip_hl * 4;
if (ntohs(new_ip->ip_len) != copy->len) {
LOG_ERR("Test case failed, recvd len (%d), expected (%d)\n",
pkt->len, copy->len);
free(pkt);
return;
}
LOG("Test case : comparing packet contents after removing options\n");
pay1 = (uint8_t *)copy->msg + MIN_IP_SIZE + ip_opt_size;
pay2 = (uint8_t *)new_ip + new_hdr_len;
if (memcmp(pay1, pay2, payload_sz)) {
LOG_ERR("Test case failed, contents didn't match\n");
free(pkt);
return;
}
free(pkt);
}