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#define min(x,y) ((x)<(y)?(x):(y))
//#define EAGAIN_DEBUG
#define HANDSHAKE_EXPECT(c, s, clierr, serverr) \
sret = cret = GNUTLS_E_AGAIN; \
do \
{ \
if (cret == GNUTLS_E_AGAIN) \
{ \
cret = gnutls_handshake (c); \
} \
if (sret == GNUTLS_E_AGAIN) \
{ \
sret = gnutls_handshake (s); \
} \
} \
while ((cret == GNUTLS_E_AGAIN || (cret == 0 && sret == GNUTLS_E_AGAIN)) && (sret == GNUTLS_E_AGAIN || (sret == 0 && cret == GNUTLS_E_AGAIN))); \
if (cret != clierr || sret != serverr) \
{ \
fprintf(stderr, "client: %s\n", gnutls_strerror(cret)); \
fprintf(stderr, "server: %s\n", gnutls_strerror(sret)); \
fail("Handshake failed\n"); \
exit(1); \
}
#define HANDSHAKE(c, s) \
HANDSHAKE_EXPECT(c,s,0,0)
#define TRANSFER(c, s, msg, msglen, buf, buflen) \
do \
{ \
ret = gnutls_record_send (c, msg, msglen); \
} \
while(ret == GNUTLS_E_AGAIN); \
do \
{ \
do \
{ \
ret = gnutls_record_recv (s, buf, buflen); \
} \
while(ret == GNUTLS_E_AGAIN); \
if (ret == 0) \
fail ("server: didn't receive any data\n"); \
else if (ret < 0) \
{ \
fail ("server: error: %s\n", gnutls_strerror (ret)); \
} \
else \
{ \
transferred += ret; \
} \
do \
{ \
ns = gnutls_record_send (server, msg, msglen); \
} \
while (ns == GNUTLS_E_AGAIN); \
do \
{ \
ret = gnutls_record_recv (client, buf, buflen); \
} \
while(ret == GNUTLS_E_AGAIN); \
if (ret == 0) \
{ \
fail ("client: Peer has closed the TLS connection\n"); \
} \
else if (ret < 0) \
{ \
if (debug) \
fputs ("!", stdout); \
fail ("client: Error: %s\n", gnutls_strerror (ret)); \
} \
else \
{ \
if (msglen != ret || memcmp (buf, msg, msglen) != 0) \
{ \
fail ("client: Transmitted data do not match\n"); \
} \
/* echo back */ \
do \
{ \
ns = gnutls_record_send (client, buf, msglen); \
} \
while (ns == GNUTLS_E_AGAIN); \
transferred += ret; \
if (debug) \
fputs (".", stdout); \
} \
} \
while (transferred < 70000)
static char to_server[64*1024];
static size_t to_server_len = 0;
static char to_client[64*1024];
static size_t to_client_len = 0;
#ifdef RANDOMIZE
#define RETURN_RND_EAGAIN(session) \
static unsigned char rnd = 0; \
if (rnd++ % 2 == 0) \
{ \
gnutls_transport_set_errno (session, EAGAIN); \
return -1; \
}
#else
#define RETURN_RND_EAGAIN(session)
#endif
static ssize_t
client_push (gnutls_transport_ptr_t tr, const void *data, size_t len)
{
size_t newlen;
RETURN_RND_EAGAIN(tr);
len = min(len, sizeof(to_server)-to_server_len);
newlen = to_server_len + len;
memcpy (to_server + to_server_len, data, len);
to_server_len = newlen;
#ifdef EAGAIN_DEBUG
fprintf(stderr, "eagain: pushed %d bytes to server (avail: %d)\n", (int)len, (int)to_server_len);
#endif
return len;
}
static ssize_t
client_pull (gnutls_transport_ptr_t tr, void *data, size_t len)
{
RETURN_RND_EAGAIN(tr);
if (to_client_len == 0)
{
#ifdef EAGAIN_DEBUG
fprintf(stderr, "eagain: Not enough data by server (asked for: %d, have: %d)\n", (int)len, (int)to_client_len);
#endif
gnutls_transport_set_errno ((gnutls_session_t)tr, EAGAIN);
return -1;
}
len = min(len, to_client_len);
memcpy (data, to_client, len);
memmove (to_client, to_client + len, to_client_len - len);
to_client_len -= len;
#ifdef EAGAIN_DEBUG
fprintf(stderr, "eagain: pulled %d bytes by client (avail: %d)\n", (int)len, (int)to_client_len);
#endif
return len;
}
static ssize_t
server_pull (gnutls_transport_ptr_t tr, void *data, size_t len)
{
//success ("server_pull len %d has %d\n", len, to_server_len);
RETURN_RND_EAGAIN(tr);
if (to_server_len == 0)
{
#ifdef EAGAIN_DEBUG
fprintf(stderr, "eagain: Not enough data by client (asked for: %d, have: %d)\n", (int)len, (int)to_server_len);
#endif
gnutls_transport_set_errno ((gnutls_session_t)tr, EAGAIN);
return -1;
}
len = min(len, to_server_len);
#ifdef EAGAIN_DEBUG
fprintf(stderr, "eagain: pulled %d bytes by server (avail: %d)\n", (int)len, (int)to_server_len);
#endif
memcpy (data, to_server, len);
memmove (to_server, to_server + len, to_server_len - len);
to_server_len -= len;
return len;
}
static ssize_t
server_push (gnutls_transport_ptr_t tr, const void *data, size_t len)
{
size_t newlen;
RETURN_RND_EAGAIN(tr);
// hexprint (data, len);
len = min(len, sizeof(to_client)-to_client_len);
newlen = to_client_len + len;
memcpy (to_client + to_client_len, data, len);
to_client_len = newlen;
#ifdef EAGAIN_DEBUG
fprintf(stderr, "eagain: pushed %d bytes to client (avail: %d)\n", (int)len, (int)to_client_len);
#endif
return len;
}
/* inline is used to avoid a gcc warning if used in mini-eagain */
inline static int server_pull_timeout_func(gnutls_transport_ptr_t ptr, unsigned int ms)
{
int ret;
if (to_server_len > 0)
ret = 1; /* available data */
else
ret = 0; /* timeout */
#ifdef EAGAIN_DEBUG
fprintf(stderr, "eagain: server_pull_timeout: %d\n", ret);
#endif
return ret;
}
inline static int client_pull_timeout_func(gnutls_transport_ptr_t ptr, unsigned int ms)
{
int ret;
if (to_client_len > 0)
ret = 1;
else
ret = 0;
#ifdef EAGAIN_DEBUG
fprintf(stderr, "eagain: client_pull_timeout: %d\n", ret);
#endif
return ret;
}
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