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#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <assert.h>
#include "net.h"
#include "player.h"
/**
* Client side function; Send hello to server
* @param[in] sock Socket to use
* @param[in] username Username of player
*/
void client_hello(int sock, const char* username)
{
uint8_t* buf;
uint8_t namelen = strlen(username);
buf = malloc(namelen+2); // type + len + username
if(buf == NULL)
{
printf("client_hello: Out of memory\n");
exit(EXIT_FAILURE);
}
buf[INDEX_TYPE] = msg_type_hello;
buf[INDEX_LEN] = namelen+2;
memcpy(buf+INDEX_PAYLOAD, username, namelen);
send(sock, buf, namelen+2, 0);
free(buf);
}
/**
* Client side function; connects to specified host:port
* @param[in] host Hostname of server
* @param[in] port Port of server
* @return Socket with open connection to server
*/
int client_connect_server(const char* host, const char* port)
{
int status;
int sock;
struct addrinfo hints, *result, *tmp;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC; // IPv4 or IPv6
hints.ai_socktype = SOCK_STREAM; // TCP socket
status = getaddrinfo(host, port, &hints, &result);
if(status != 0)
{
printf("getaddrinfo: %s\n", gai_strerror(status));
exit(EXIT_FAILURE);
}
// connect to first result in linked addrinfo list
for(tmp = result; tmp != NULL; tmp = tmp->ai_next)
{
// create socket
sock = socket(tmp->ai_family, tmp->ai_socktype, tmp->ai_protocol);
if(sock == -1)
continue;
// connect!
if(connect(sock, tmp->ai_addr, tmp->ai_addrlen) != -1)
break; // Success!
close(sock);
}
if(tmp == NULL)
{
printf("failed to connect\n");
exit(EXIT_FAILURE);
}
freeaddrinfo(result);
return sock;
}
static player_list* client_recv_player_list(int sock, uint8_t data_len)
{
uint8_t buf[data_len];
player_list* players;
uint32_t pos;
recv(sock, buf, data_len, 0);
assert(buf[INDEX_TYPE] == msg_type_start_game);
players = malloc(sizeof(player_list));
if(players == NULL)
{
printf("client_recv_player_list: Out of memory\n");
exit(EXIT_FAILURE);
}
pos = INDEX_PAYLOAD;
players->count = buf[pos++];
// read usernames from buffer
for(int i=0; i<players->count; i++)
{
uint8_t namelen = buf[pos++];
players->names[i] = malloc(namelen+1);
memcpy(players->names[i], buf+pos, namelen);
players->names[i][namelen] = '\0';
pos += namelen;
}
return players;
}
static hand* client_recv_deal_cards(int sock, uint8_t data_len)
{
uint8_t buf[data_len];
hand* h = malloc(sizeof(hand));
assert(data_len == 2+MAX_HAND_CARDS); // deal_cards packet have fixed size
recv(sock, buf, data_len, 0);
assert(buf[INDEX_TYPE] == msg_type_deal_cards);
for(int i=0; i<MAX_HAND_CARDS; i++)
*h[i] = (card) buf[i+2];
return h;
}
/**
* Client side function; generic function for receiving packets
* @param[in] sock Socket on which to receive
* @param[in] wanted Desired packet type
* @return Pointer to desired data
*/
void* client_recv(int sock, uint8_t wanted)
{
void* result = NULL;
uint8_t buf[10], type, data_len;
ssize_t len = recv(sock, buf, 10, MSG_PEEK); // just peek into packet to determine type
assert(len != -1);
type = buf[INDEX_TYPE];
data_len = buf[INDEX_LEN];
if(type != wanted)
{
printf("client_recv: received type %d instead of %d", type, wanted);
return NULL;
}
switch(type)
{
case msg_type_start_game:
result = client_recv_player_list(sock, data_len);
break;
case msg_type_deal_cards:
result = client_recv_deal_cards(sock, data_len);
break;
}
return result;
}
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