static int32_t camd35_recv(uchar *buf, int32_t rs)
{
int32_t rc = 0, s, n=0, buflen=0, len=0;
for (s=0; !rc; s++) {
switch(s) {
case 0:
if (rs < 36) {
rc = -1;
goto out;
}
break;
case 1:
switch (camd35_auth_client(buf)) {
case 0: break; // ok
case 1: rc=-2; break; // unknown user
}
memmove(buf, buf+4, rs-=4);
break;
case 2:
aes_decrypt(&cl_aes_keys, buf, rs);
if (rs!=boundary(4, rs))
cs_log_debug("WARNING: packet size has wrong decryption boundary");
n=(buf[0]==3) ? 0x34 : 0;
//Fix for ECM request size > 255 (use ecm length field)
if(buf[0]==0)
buflen = (((buf[21]&0x0f)<< 8) | buf[22])+3;
else
buflen = buf[1];
n = boundary(4, n+20+buflen);
cs_log_debug("received %d bytes from client", rs);
if (n<rs)
cs_log_debug("ignoring %d bytes of garbage", rs-n);
else
if (n>rs) rc=-3;
break;
case 3:
if (crc32(0L, buf+20, buflen)!=b2i(4, buf+4)) rc=-4;
if (!rc) rc=n;
break;
}
}
out:
switch(rc) {
case -2: cs_log("unknown user"); break;
case -3: cs_log("incomplete request!"); break;
case -4: cs_log("checksum error (wrong password?)"); break;
}
return(rc);
}
static int32_t camd35_recv(uint8_t *buf, int32_t rs)
{
int32_t rc, s, n = 0, buflen = 0;
for(rc = s = 0; !rc; s++)
{
switch(s)
{
case 0:
if(rs < 36)
{
rc = -1;
goto out;
}
break;
case 1:
switch(camd35_auth_client(buf))
{
case 0:
break; // ok
case 1:
rc = -2;
break; // unknown user
default:
rc = -9;
break; // error's from cs_auth()
}
memmove(buf, buf + 4, rs -= 4);
break;
case 2:
aes_decrypt(&cl_aes_keys, buf, rs);
if(rs != boundary(4, rs))
{ cs_log_dbg(0, "WARNING: packet size has wrong decryption boundary"); }
n = (buf[0] == 3) ? 0x34 : 0;
//Fix for ECM request size > 255 (use ecm length field)
if(buf[0] == 0)
{ buflen = (((buf[21] & 0x0f) << 8) | buf[22]) + 3; }
else if(buf[0] == 0x3d || buf[0] == 0x3e || buf[0] == 0x3f) //cacheex-push
{ buflen = buf[1] | (buf[2] << 8); }
else
{ buflen = buf[1]; }
n = boundary(4, n + 20 + buflen);
cs_log_dbg(0, "received %d bytes from client", rs);
if(n < rs)
{ cs_log_dbg(0, "ignoring %d bytes of garbage", rs - n); }
else if(n > rs) { rc = -3; }
break;
case 3:
if(crc32(0, buf + 20, buflen) != b2i(4, buf + 4)) {
rc = -4;
cs_log_dump_dbg(buf, rs, "camd35 checksum failed for packet: ");
cs_log_dbg(0, "checksum: %X", b2i(4, buf+4));
}
if(!rc) { rc = n; }
break;
}
}
out:
if((rs > 0) && ((rc == -1) || (rc == -2)))
{
cs_log_dbg(0, "received %d bytes from client (native)", rs);
}
switch(rc)
{
case -1:
cs_log("packet is too small (received %d bytes, expected at least 36 bytes)", rs);
break;
case -2:
cs_log("unknown user");
break;
case -3:
cs_log("incomplete request !");
break;
case -4:
cs_log("checksum error (wrong password ?)");
break;
}
return (rc);
}
static int32_t camd35_recv(struct s_client *client, uchar *buf, int32_t l)
{
int32_t rc, s, rs, n = 0, buflen = 0, len = 0;
for(rc = rs = s = 0; !rc; s++)
{
switch(s)
{
case 0:
if(!client->udp_fd) { return (-9); }
if(client->is_udp && client->typ == 'c')
{
rs = recv_from_udpipe(buf);
}
else
{
//read minimum packet size (4 byte ucrc + 32 byte data) to detect packet size (tcp only)
//rs = cs_recv(client->udp_fd, buf, client->is_udp ? l : 36, 0);
if(client->is_udp){
while (1){
rs = cs_recv(client->udp_fd, buf, l, 0);
if (rs < 0){
if(errno == EINTR) { continue; } // try again in case of interrupt
if(errno == EAGAIN) { continue; } //EAGAIN needs select procedure again
cs_log_dbg(client->typ == 'c' ? D_CLIENT : D_READER, "ERROR: %s (errno=%d %s)", __func__, errno, strerror(errno));
break;
}else {break;}
}
}else{
int32_t tot=36, readed=0;
rs = 0;
do
{
readed = cs_recv(client->udp_fd, buf+rs, tot, 0);
if (readed < 0){
if(errno == EINTR) { continue; } // try again in case of interrupt
if(errno == EAGAIN) { continue; } //EAGAIN needs select procedure again
cs_log_dbg(client->typ == 'c' ? D_CLIENT : D_READER, "ERROR: %s (errno=%d %s)", __func__, errno, strerror(errno));
break;
}
if (readed == 0){ // nothing to read left!
rc = -5;
break;
}
if (readed > 0){ // received something, add it!
tot-=readed;
rs+=readed;
}
}
while(tot!=0);
}
}
if(rs < 36)
{
if(rc != -5)
{ rc = -1; }
goto out;
}
break;
case 1:
switch(camd35_auth_client(client, buf))
{
case 0:
break; // ok
case 1:
rc = -2;
break; // unknown user
default:
rc = -9;
break; // error's from cs_auth()
}
memmove(buf, buf + 4, rs -= 4);
break;
case 2:
aes_decrypt(client->aes_keys, buf, rs);
if(rs != boundary(4, rs))
cs_log_dbg(client->typ == 'c' ? D_CLIENT : D_READER,
"WARNING: packet size has wrong decryption boundary");
n = (buf[0] == 3) ? 0x34 : 0;
//Fix for ECM request size > 255 (use ecm length field)
if(buf[0] == 0)
{ buflen = (((buf[21] & 0x0f) << 8) | buf[22]) + 3; }
else if(buf[0] == 0x3d || buf[0] == 0x3e || buf[0] == 0x3f) //cacheex-push
{ buflen = buf[1] | (buf[2] << 8); }
else
{ buflen = buf[1]; }
n = boundary(4, n + 20 + buflen);
if(!(client->is_udp && client->typ == 'c') && (rs < n) && ((n - 32) > 0))
{
//len = cs_recv(client->udp_fd, buf+32, n-32, 0); // read the rest of the packet
int32_t tot=n-32, readed=0;
len = 0;
do{
readed = cs_recv(client->udp_fd, buf+32+len, tot, 0); // read the rest of the packet
if (readed < 0){
if(errno == EINTR) { continue; } // try again in case of interrupt
if(errno == EAGAIN) { continue; } //EAGAIN needs select procedure again
cs_log_dbg(client->typ == 'c' ? D_CLIENT : D_READER, "ERROR: %s (errno=%d %s)", __func__, errno, strerror(errno));
break;
}
if (readed == 0){ // nothing to read left!
break;
}
if (readed > 0){ // received something, add it!
tot-=readed;
len+=readed;
}
}
while(tot!=0);
if(len > 0)
{
rs += len;
aes_decrypt(client->aes_keys, buf + 32, len);
}
if(len < 0)
{
rc = -1;
goto out;
}
}
cs_log_dump_dbg(client->typ == 'c' ? D_CLIENT : D_READER,
buf, rs, "received %d bytes from %s", rs, remote_txt());
if(n < rs)
cs_log_dbg(client->typ == 'c' ? D_CLIENT : D_READER,
"ignoring %d bytes of garbage", rs - n);
else if(n > rs) { rc = -3; }
break;
case 3:
if(crc32(0L, buf + 20, buflen) != b2i(4, buf + 4)) { rc = -4; }
if(!rc) { rc = n; }
break;
}
}
out:
if((rs > 0) && ((rc == -1) || (rc == -2)))
{
cs_log_dump_dbg(client->typ == 'c' ? D_CLIENT : D_READER, buf, rs,
"received %d bytes from %s (native)", rs, remote_txt());
}
if(rc >= 0) { client->last = time(NULL); } // last client action is now
switch(rc)
{
//case 0: break;
case -1:
cs_log("packet is too small (received %d bytes, expected %d bytes)", rs, l);
break;
case -2:
if(cs_auth_client(client, 0, "unknown user"))
{ cs_disconnect_client(client); }
break;
case -3:
cs_log("incomplete request !");
break;
case -4:
cs_log("checksum error (wrong password ?)");
break;
case -5:
cs_log_dbg(client->typ == 'c' ? D_CLIENT : D_READER, "connection closed");
break;
//default: cs_log_dbg(D_TRACE, "camd35_recv returns rc=%d", rc); break;
}
return (rc);
}
