Gadu-gadu Protocol - logging

[Trok]

Hi, I have a trouble during the logging by gg protocol from http://toxygen.net/libgadu/protocol/. I connect with server and receive seed, but after sent packet and structure to login, don't receive any message(even package with any wrong communique). That my code:

struct gg_header {
        int type;   /* typ pakietu */
        int length;   /* długość reszty pakietu */
};
 
struct gg_login80 {
        int uin;              /* numer Gadu-Gadu */ (gg number)
        char* language;        /* język: "pl" */
        char hash_type;       /* rodzaj funkcji skrótu hasła */
        char* hash;             /* skrót hasła dopełniony \0 */
        int status;           /* początkowy status połączenia */
        int flags;            /* początkowe flagi połączenia */
        int features;         /* opcje protokołu (0x00000007)*/(protocol option)
        int local_ip;         /* lokalny adres połączeń bezpośrednich (nieużywany) */
        short local_port;     /* lokalny port połączeń bezpośrednich (nieużywany) */
        int external_ip;      /* zewnętrzny adres (nieużywany) */
        short external_port;  /* zewnętrzny port (nieużywany) */
        char image_size;      /* maksymalny rozmiar grafiki w KB */
        char unknown2;        /* 0x64 */(idk)
        int version_len;      /* długość ciągu z wersją (0x21) */
        char* version;       /* "Gadu-Gadu Client build 8.0.0.7669" (bez \0) */
        int description_size; /* rozmiar opisu */
};

struct gg_header {
        int type;   /* typ pakietu */
        int length;   /* długość reszty pakietu */
};

struct gg_login80 {
        int uin;              /* numer Gadu-Gadu */ (gg number)
        char* language;        /* język: "pl" */
        char hash_type;       /* rodzaj funkcji skrótu hasła */
        char* hash;             /* skrót hasła dopełniony \0 */
        int status;           /* początkowy status połączenia */
        int flags;            /* początkowe flagi połączenia */
        int features;         /* opcje protokołu (0x00000007)*/(protocol option)
        int local_ip;         /* lokalny adres połączeń bezpośrednich (nieużywany) */
        short local_port;     /* lokalny port połączeń bezpośrednich (nieużywany) */
        int external_ip;      /* zewnętrzny adres (nieużywany) */
        short external_port;  /* zewnętrzny port (nieużywany) */
        char image_size;      /* maksymalny rozmiar grafiki w KB */
        char unknown2;        /* 0x64 */(idk)
        int version_len;      /* długość ciągu z wersją (0x21) */
        char* version;       /* "Gadu-Gadu Client build 8.0.0.7669" (bez \0) */
        int description_size; /* rozmiar opisu */
};

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void MainWindow::login_GG(){  
    gg_login80 *login = new gg_login80();
 
    //example structure
    login->uin = 1234567;
    login->language = "pl";
    login->hash_type = GG_LOGIN_HASH_GG32;
    login->hash = "";
    login->status = GG_STATUS_AVAIL;
    login->flags = 0;
    login->features = 0x7;
    login->local_ip = 0;
    login->local_port = 0;
    login->external_ip = 0;
    login->external_port = 0;
    login->image_size = 0;
    login->unknown2 = 0x64;
    login->version_len = sizeof(login->version);
    login->version = "";
    login->description_size = 0;
 
    gg_header *header = new gg_header;
    header->type = GG_LOGIN80;
    header->length = sizeof(GG_LOGIN80);
 
    connect(socket, SIGNAL(readyRead()), this, SLOT(s_read()));
    socket->write((char*)header, sizeof(gg_header));
    socket->write((char*)login, sizeof(gg_login80));
}
 
void MainWindow::s_read(){
    //That function doesn't call forth because server doesn't receive any package to read
    qDebug () << "Receive packet.";
}

void MainWindow::login_GG(){  
    gg_login80 *login = new gg_login80();

    //example structure
    login->uin = 1234567;
    login->language = "pl";
    login->hash_type = GG_LOGIN_HASH_GG32;
    login->hash = "";
    login->status = GG_STATUS_AVAIL;
    login->flags = 0;
    login->features = 0x7;
    login->local_ip = 0;
    login->local_port = 0;
    login->external_ip = 0;
    login->external_port = 0;
    login->image_size = 0;
    login->unknown2 = 0x64;
    login->version_len = sizeof(login->version);
    login->version = "";
    login->description_size = 0;

    gg_header *header = new gg_header;
    header->type = GG_LOGIN80;
    header->length = sizeof(GG_LOGIN80);

    connect(socket, SIGNAL(readyRead()), this, SLOT(s_read()));
    socket->write((char*)header, sizeof(gg_header));
    socket->write((char*)login, sizeof(gg_login80));
}

void MainWindow::s_read(){
    //That function doesn't call forth because server doesn't receive any package to read
    qDebug () << "Receive packet.";
}

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I test by tcpdump and appropriate functons in Qt, that packages are sending to server, unfortunately i don't recive anything (size of packet is 0).

[Fenix Voltres]

EDITED

Login packet has it's own structure. When you send wrong structure, server may not respond at all.
You're making some mistakes:
1) You can't use sizeof operator in header->length, because gg_login80 struct contains pointers to data, and you will send the data, not the pointers; (what's more, you meant "gg_login80" instead of const "GG_LOGIN80");
2) hash variable has to be 64 bytes long, (and, BTW, are you counting it anywhere?).
3) check if second's write method returns number equals to what you sent in header->length - when you sent less bytes, server will still wait for the rest.
4) Casting header and login to char* for 95% will return crap (but not sure of it) - same bug with sizeof here, also.

Generally, I advise you to log every packet (bytes) that you send / receive in order to check it's correctness.