static void sendsuboption(struct connectdata *conn, int option)
{
ssize_t bytes_written;
int err;
unsigned short x, y;
unsigned char*uc1, *uc2;
struct SessionHandle *data = conn->data;
struct TELNET *tn = (struct TELNET *)data->req.protop;
switch (option) {
case CURL_TELOPT_NAWS:
/* We prepare data to be sent */
CURL_SB_CLEAR(tn);
CURL_SB_ACCUM(tn, CURL_IAC);
CURL_SB_ACCUM(tn, CURL_SB);
CURL_SB_ACCUM(tn, CURL_TELOPT_NAWS);
/* We must deal either with litte or big endien processors */
/* Window size must be sent according to the 'network order' */
x=htons(tn->subopt_wsx);
y=htons(tn->subopt_wsy);
uc1 = (unsigned char*)&x;
uc2 = (unsigned char*)&y;
CURL_SB_ACCUM(tn, uc1[0]);
CURL_SB_ACCUM(tn, uc1[1]);
CURL_SB_ACCUM(tn, uc2[0]);
CURL_SB_ACCUM(tn, uc2[1]);
CURL_SB_ACCUM(tn, CURL_IAC);
CURL_SB_ACCUM(tn, CURL_SE);
CURL_SB_TERM(tn);
/* data suboption is now ready */
printsub(data, '>', (unsigned char *)tn->subbuffer+2,
CURL_SB_LEN(tn)-2);
/* we send the header of the suboption... */
bytes_written = swrite(conn->sock[FIRSTSOCKET], tn->subbuffer, 3);
if(bytes_written < 0) {
err = SOCKERRNO;
failf(data, "Sending data failed (%d)", err);
}
/* ... then the window size with the send_telnet_data() function
to deal with 0xFF cases ... */
send_telnet_data(conn, (char *)tn->subbuffer+3, 4);
/* ... and the footer */
bytes_written = swrite(conn->sock[FIRSTSOCKET], tn->subbuffer+7, 2);
if(bytes_written < 0) {
err = SOCKERRNO;
failf(data, "Sending data failed (%d)", err);
}
break;
}
}
static
void telrcv(struct connectdata *conn,
unsigned char *inbuf, /* Data received from socket */
ssize_t count) /* Number of bytes received */
{
unsigned char c;
int in = 0;
struct SessionHandle *data = conn->data;
struct TELNET *tn = (struct TELNET *)data->reqdata.proto.telnet;
while(count--)
{
c = inbuf[in++];
switch (tn->telrcv_state)
{
case CURL_TS_CR:
tn->telrcv_state = CURL_TS_DATA;
if (c == '\0')
{
break; /* Ignore \0 after CR */
}
Curl_client_write(conn, CLIENTWRITE_BODY, (char *)&c, 1);
continue;
case CURL_TS_DATA:
if (c == CURL_IAC)
{
tn->telrcv_state = CURL_TS_IAC;
break;
}
else if(c == '\r')
{
tn->telrcv_state = CURL_TS_CR;
}
Curl_client_write(conn, CLIENTWRITE_BODY, (char *)&c, 1);
continue;
case CURL_TS_IAC:
process_iac:
switch (c)
{
case CURL_WILL:
tn->telrcv_state = CURL_TS_WILL;
continue;
case CURL_WONT:
tn->telrcv_state = CURL_TS_WONT;
continue;
case CURL_DO:
tn->telrcv_state = CURL_TS_DO;
continue;
case CURL_DONT:
tn->telrcv_state = CURL_TS_DONT;
continue;
case CURL_SB:
CURL_SB_CLEAR(tn);
tn->telrcv_state = CURL_TS_SB;
continue;
case CURL_IAC:
Curl_client_write(conn, CLIENTWRITE_BODY, (char *)&c, 1);
break;
case CURL_DM:
case CURL_NOP:
case CURL_GA:
default:
printoption(data, "RCVD", CURL_IAC, c);
break;
}
tn->telrcv_state = CURL_TS_DATA;
continue;
case CURL_TS_WILL:
printoption(data, "RCVD", CURL_WILL, c);
tn->please_negotiate = 1;
rec_will(conn, c);
tn->telrcv_state = CURL_TS_DATA;
continue;
case CURL_TS_WONT:
printoption(data, "RCVD", CURL_WONT, c);
tn->please_negotiate = 1;
rec_wont(conn, c);
tn->telrcv_state = CURL_TS_DATA;
continue;
case CURL_TS_DO:
printoption(data, "RCVD", CURL_DO, c);
tn->please_negotiate = 1;
rec_do(conn, c);
tn->telrcv_state = CURL_TS_DATA;
continue;
case CURL_TS_DONT:
printoption(data, "RCVD", CURL_DONT, c);
tn->please_negotiate = 1;
rec_dont(conn, c);
tn->telrcv_state = CURL_TS_DATA;
continue;
case CURL_TS_SB:
if (c == CURL_IAC)
{
tn->telrcv_state = CURL_TS_SE;
}
else
{
CURL_SB_ACCUM(tn,c);
}
continue;
case CURL_TS_SE:
if (c != CURL_SE)
{
if (c != CURL_IAC)
{
/*
* This is an error. We only expect to get "IAC IAC" or "IAC SE".
* Several things may have happend. An IAC was not doubled, the
* IAC SE was left off, or another option got inserted into the
* suboption are all possibilities. If we assume that the IAC was
* not doubled, and really the IAC SE was left off, we could get
* into an infinate loop here. So, instead, we terminate the
* suboption, and process the partial suboption if we can.
*/
CURL_SB_ACCUM(tn, CURL_IAC);
CURL_SB_ACCUM(tn, c);
tn->subpointer -= 2;
CURL_SB_TERM(tn);
printoption(data, "In SUBOPTION processing, RCVD", CURL_IAC, c);
suboption(conn); /* handle sub-option */
tn->telrcv_state = CURL_TS_IAC;
goto process_iac;
}
CURL_SB_ACCUM(tn,c);
tn->telrcv_state = CURL_TS_SB;
}
else
{
CURL_SB_ACCUM(tn, CURL_IAC);
CURL_SB_ACCUM(tn, CURL_SE);
tn->subpointer -= 2;
CURL_SB_TERM(tn);
suboption(conn); /* handle sub-option */
tn->telrcv_state = CURL_TS_DATA;
}
break;
}
}
}
static
CURLcode telrcv(struct connectdata *conn,
const unsigned char *inbuf, /* Data received from socket */
ssize_t count) /* Number of bytes received */
{
unsigned char c;
CURLcode result;
int in = 0;
int startwrite=-1;
struct SessionHandle *data = conn->data;
struct TELNET *tn = (struct TELNET *)data->req.protop;
#define startskipping() \
if(startwrite >= 0) { \
result = Curl_client_write(conn, \
CLIENTWRITE_BODY, \
(char *)&inbuf[startwrite], \
in-startwrite); \
if(result) \
return result; \
} \
startwrite = -1
#define writebyte() \
if(startwrite < 0) \
startwrite = in
#define bufferflush() startskipping()
while(count--) {
c = inbuf[in];
switch (tn->telrcv_state) {
case CURL_TS_CR:
tn->telrcv_state = CURL_TS_DATA;
if(c == '\0') {
startskipping();
break; /* Ignore \0 after CR */
}
writebyte();
break;
case CURL_TS_DATA:
if(c == CURL_IAC) {
tn->telrcv_state = CURL_TS_IAC;
startskipping();
break;
}
else if(c == '\r')
tn->telrcv_state = CURL_TS_CR;
writebyte();
break;
case CURL_TS_IAC:
process_iac:
DEBUGASSERT(startwrite < 0);
switch (c) {
case CURL_WILL:
tn->telrcv_state = CURL_TS_WILL;
break;
case CURL_WONT:
tn->telrcv_state = CURL_TS_WONT;
break;
case CURL_DO:
tn->telrcv_state = CURL_TS_DO;
break;
case CURL_DONT:
tn->telrcv_state = CURL_TS_DONT;
break;
case CURL_SB:
CURL_SB_CLEAR(tn);
tn->telrcv_state = CURL_TS_SB;
break;
case CURL_IAC:
tn->telrcv_state = CURL_TS_DATA;
writebyte();
break;
case CURL_DM:
case CURL_NOP:
case CURL_GA:
default:
tn->telrcv_state = CURL_TS_DATA;
printoption(data, "RCVD", CURL_IAC, c);
break;
}
break;
case CURL_TS_WILL:
printoption(data, "RCVD", CURL_WILL, c);
tn->please_negotiate = 1;
rec_will(conn, c);
tn->telrcv_state = CURL_TS_DATA;
break;
case CURL_TS_WONT:
printoption(data, "RCVD", CURL_WONT, c);
tn->please_negotiate = 1;
rec_wont(conn, c);
tn->telrcv_state = CURL_TS_DATA;
break;
case CURL_TS_DO:
printoption(data, "RCVD", CURL_DO, c);
tn->please_negotiate = 1;
rec_do(conn, c);
tn->telrcv_state = CURL_TS_DATA;
break;
case CURL_TS_DONT:
printoption(data, "RCVD", CURL_DONT, c);
tn->please_negotiate = 1;
rec_dont(conn, c);
tn->telrcv_state = CURL_TS_DATA;
break;
case CURL_TS_SB:
if(c == CURL_IAC)
tn->telrcv_state = CURL_TS_SE;
else
CURL_SB_ACCUM(tn, c);
break;
case CURL_TS_SE:
if(c != CURL_SE) {
if(c != CURL_IAC) {
/*
* This is an error. We only expect to get "IAC IAC" or "IAC SE".
* Several things may have happened. An IAC was not doubled, the
* IAC SE was left off, or another option got inserted into the
* suboption are all possibilities. If we assume that the IAC was
* not doubled, and really the IAC SE was left off, we could get
* into an infinate loop here. So, instead, we terminate the
* suboption, and process the partial suboption if we can.
*/
CURL_SB_ACCUM(tn, CURL_IAC);
CURL_SB_ACCUM(tn, c);
tn->subpointer -= 2;
CURL_SB_TERM(tn);
printoption(data, "In SUBOPTION processing, RCVD", CURL_IAC, c);
suboption(conn); /* handle sub-option */
tn->telrcv_state = CURL_TS_IAC;
goto process_iac;
}
CURL_SB_ACCUM(tn, c);
tn->telrcv_state = CURL_TS_SB;
}
else
{
CURL_SB_ACCUM(tn, CURL_IAC);
CURL_SB_ACCUM(tn, CURL_SE);
tn->subpointer -= 2;
CURL_SB_TERM(tn);
suboption(conn); /* handle sub-option */
tn->telrcv_state = CURL_TS_DATA;
}
break;
}
++in;
}
bufferflush();
return CURLE_OK;
}
