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libtelnet
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get libtelnet compiling; more buffer work

This commit is contained in:
Sean Middleditch 2009-03-13 22:48:05 -04:00
parent fddf1c4731
commit 4d9444d028
2 changed files with 78 additions and 75 deletions
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89
libtelnet.c
View File

@ -6,11 +6,23 @@
* all present and future rights to this code under copyright law.
*/
#include <malloc.h>
#include "libtelnet.h"
/* buffer sizes */
static const unsigned int _buffer_sizes[] = {
0,
512,
2048,
8192,
16384,
};
static const unsigned int _buffer_sizes_count =
sizeof(_buffer_sizes) / sizeof(_buffer_sizes[0]);
/* initialize a telnet state tracker */
void libtelnet_init(struct libtelnet_t *telnet) {
telnet->state = LIBTELNET_TEXT;
telnet->state = LIBTELNET_STATE_TEXT;
telnet->buffer = 0;
telnet->size = 0;
telnet->length = 0;
@ -27,43 +39,38 @@ void libtelnet_free(struct libtelnet_t *telnet) {
}
/* push a byte into the telnet buffer */
static enum libtelnet_error_t _libtelnet_buffer_byte(
static enum libtelnet_error_t _buffer_byte(
struct libtelnet_t *telnet, unsigned char byte, void *user_data) {
unsigned char *new_buffer;
int i;
/* check if we're out of room */
if (telnet->length == telnet->size) {
/* if we already have a large buffer, we're out of space, give up */
if (telnet->size == LIBTELNET_BUFFER_SIZE_LARGE) {
/* find the next buffer size */
for (i = 0; i != _buffer_sizes_count; ++i) {
if (_buffer_sizes[i] == telnet->size)
break;
}
/* overflow -- can't grow any more */
if (i >= _buffer_sizes_count - 1) {
libtelnet_error_cb(telnet, LIBTELNET_ERROR_OVERFLOW, user_data);
libtelnet_free(telnet);
return LIBTELNET_ERROR_OVERFLOW;
/* if we have a small buffer, try to resize to a larger one */
} else if (telnet->size == LIBTELNET_BUFFER_SIZE_SMALL) {
unsigned char *new_buffer = (unsigned char *)realloc(
telnet->buffer, LIBTELNET_BUFFER_SIZE_LARGE);
if (new_buffer == 0) {
libtelnet_error_cb(telnet, LIBTELNET_ERROR_NOMEM,
user_data);
libtelnet_free(telnet);
return LIBTELNET_ERROR_NOMEM;
}
telnet->buffer = new_buffer;
telnet->size = LIBTELNET_BUFFER_SIZE_LARGE;
/* we have no buffer at all, so allocate one */
} else {
telnet->buffer = (unsigned char *)realloc(
telnet->buffer, LIBTELNET_BUFFER_SIZE_SMALL);
if (telnet->buffer == 0) {
libtelnet_error_cb(telnet, LIBTELNET_ERROR_NOMEM,
user_data);
libtelnet_free(telnet);
return LIBTELNET_ERROR_NOMEM;
}
telnet->size = LIBTELNET_BUFFER_SIZE_SMALL;
}
/* (re)allocate buffer */
new_buffer = (unsigned char *)realloc(telnet->buffer,
_buffer_sizes[i + 1]);
if (new_buffer == 0) {
libtelnet_error_cb(telnet, LIBTELNET_ERROR_NOMEM,
user_data);
libtelnet_free(telnet);
return LIBTELNET_ERROR_NOMEM;
}
telnet->buffer = new_buffer;
telnet->size = _buffer_sizes[i + 1];
}
/* push the byte, all set */
@ -82,7 +89,7 @@ void libtelnet_push_byte(struct libtelnet_t *telnet, unsigned char byte,
telnet->state = LIBTELNET_STATE_IAC;
/* regular input byte */
else
libtelnet_input_cb(telnet, byte, user_data);
libtelnet_input_cb(telnet, &byte, 1, user_data);
break;
/* IAC command */
@ -107,8 +114,8 @@ void libtelnet_push_byte(struct libtelnet_t *telnet, unsigned char byte,
break;
/* IAC escaping */
case LIBTELNET_IAC:
telbet->input_cb(telnet, LIBTELNET_IAC, user_data);
libtelnet->state = LIBTELNET_STATE_TEXT;
libtelnet_input_cb(telnet, &byte, 1, user_data);
telnet->state = LIBTELNET_STATE_TEXT;
break;
/* some other command */
default:
@ -141,7 +148,7 @@ void libtelnet_push_byte(struct libtelnet_t *telnet, unsigned char byte,
if (byte == LIBTELNET_IAC)
telnet->state = LIBTELNET_STATE_SB_IAC;
/* buffer the byte, or bail if we can't */
else if (_libtelnet_buffer_byte(telnet, LIBTELNET_IAC, user_data) !=
else if (_buffer_byte(telnet, LIBTELNET_IAC, user_data) !=
LIBTELNET_ERROR_OK)
telnet->state = LIBTELNET_STATE_TEXT;
else
@ -170,7 +177,7 @@ void libtelnet_push_byte(struct libtelnet_t *telnet, unsigned char byte,
/* escaped IAC byte */
case LIBTELNET_IAC:
/* push IAC into buffer */
if (_libtelnet_buffer_byte(telnet, LIBTELNET_IAC, user_data) !=
if (_buffer_byte(telnet, LIBTELNET_IAC, user_data) !=
LIBTELNET_ERROR_OK)
telnet->state = LIBTELNET_STATE_TEXT;
else
@ -188,8 +195,8 @@ void libtelnet_push_byte(struct libtelnet_t *telnet, unsigned char byte,
/* push a byte buffer into the state tracker */
void libtelnet_push_buffer(struct libtelnet_t *telnet, unsigned char *buffer,
size_t size, void *user_data) {
size_t i;
unsigned int size, void *user_data) {
unsigned int i;
for (i = 0; i != size; ++i)
libtelnet_push_byte(telnet, buffer[i], user_data);
}
@ -210,8 +217,8 @@ void libtelnet_send_negotiate(struct libtelnet_t *telnet, unsigned char cmd,
/* send non-command data (escapes IAC bytes) */
void libtelnet_send_data(struct libtelnet_t *telnet, unsigned char *buffer,
size_t size, void *user_data) {
size_t i, l;
unsigned int size, void *user_data) {
unsigned int i, l;
for (l = i = 0; i != size; ++i) {
/* dump prior portion of text, send escaped bytes */
if (buffer[i] == LIBTELNET_IAC) {
@ -232,7 +239,7 @@ void libtelnet_send_data(struct libtelnet_t *telnet, unsigned char *buffer,
/* send sub-request */
void libtelnet_send_subrequest(struct libtelnet_t *telnet, unsigned char type,
unsigned char *buffer, size_t size, void *user_data) {
unsigned char *buffer, unsigned int size, void *user_data) {
libtelnet_send_command(telnet, LIBTELNET_SB, user_data);
libtelnet_send_data(telnet, &type, 1, user_data);
libtelnet_send_data(telnet, buffer, size, user_data);

64
libtelnet.h
View File

@ -9,11 +9,6 @@
#if !defined(LIBTELNET_INCLUDE)
#define LIBTELNET 1
/* sub request buffer size, normal (defualt 1K) */
#define LIBTELNET_BUFFER_SIZE_SMALL (1 * 1024)
/* sub request buffer size, enlarged (default 16K) */
#define LIBTELNET_BUFFER_SIZE_LARGE (16 * 1024)
/* telnet special values */
#define LIBTELNET_IAC 255
#define LIBTELNET_DONT 254
@ -50,34 +45,34 @@ enum libtelnet_error_t {
LIBTELNET_ERROR_UNKNOWN, /* some crazy unexplainable unknown error */
};
/* state tracker */
struct libtelnet_t {
/* sub-request buffer */
unsigned char *buffer;
/* current size of the buffer */
unsigned int size;
/* length of data in the buffer */
unsigned int length;
/* current state */
enum libtelnet_state_t state;
};
/* libtelnet callback declarations
* APPLICATION MUST IMPLEMENT THESE FUNCTIONS!!
*/
extern void libtelnet_input_cb(struct libtelnet_t *telnet, unsigned char
byte, void *user_data);
extern void libtelnet_output_cb(struct libtelnet_t *telnet, unsigned char
byte, void *user_data);
extern void libtelnet_command_cb(struct libtelnet_t *telnet, unsigned char
cmd, void *user_data);
extern void libtelnet_negotiate_cb(struct libtelnet_t *telnet, unsigned char
cmd, unsigned char opt, void *user_data);
extern void libtelnet_subrequest_cb(struct libtelnet_t *telnet, unsigned char
cmd, unsigned char type, unsigned char *data, size_t size,
void *user_data);
extern void libtelnet_input_cb(struct libtelnet_t *telnet,
unsigned char *buffer, unsigned int size, void *user_data);
extern void libtelnet_output_cb(struct libtelnet_t *telnet,
unsigned char *buffer, unsigned int size, void *user_data);
extern void libtelnet_command_cb(struct libtelnet_t *telnet,
unsigned char cmd, void *user_data);
extern void libtelnet_negotiate_cb(struct libtelnet_t *telnet,
unsigned char cmd, unsigned char opt, void *user_data);
extern void libtelnet_subrequest_cb(struct libtelnet_t *telnet,
unsigned char type, unsigned char *data, unsigned int size,
void *user_data);
extern void libtelnet_error_cb(struct libtelnet_t *telnet,
enum libtelnet_error_t error, void *user_data);
/* state tracker */
struct libtelnet_t {
/* current state */
enum libtelnet_state_t state;
/* sub-request buffer */
char *buffer;
/* current size of the buffer */
size_t size;
/* length of data in the buffer */
size_t length;
};
enum libtelnet_error_t error, void *user_data);
/* initialize a telnet state tracker */
extern void libtelnet_init(struct libtelnet_t *telnet);
@ -86,12 +81,12 @@ extern void libtelnet_init(struct libtelnet_t *telnet);
extern void libtelnet_free(struct libtelnet_t *telnet);
/* push a single byte into the state tracker */
extern void libtelnet_push_byte(struct libtelnet_t *telnet, unsigned char byte,
void *user_data);
extern void libtelnet_push_byte(struct libtelnet_t *telnet,
unsigned char byte, void *user_data);
/* push a byte buffer into the state tracker */
extern void libtelnet_push_buffer(struct libtelnet_t *telnet,
unsigned char *buffer, size_t size, void *user_data);
unsigned char *buffer, unsigned int size, void *user_data);
/* send an iac command */
extern void libtelnet_send_command(struct libtelnet_t *telnet,
@ -103,10 +98,11 @@ extern void libtelnet_send_negotiate(struct libtelnet_t *telnet,
/* send non-command data (escapes IAC bytes) */
extern void libtelnet_send_data(struct libtelnet_t *telnet,
unsigned char *buffer, size_t size, void *user_data);
unsigned char *buffer, unsigned int size, void *user_data);
/* send sub-request */
extern void libtelnet_send_subrequest(struct libtelnet_t *telnet,
unsigned char type, unsigned char *buffer, size_t size, void *user_data);
unsigned char type, unsigned char *buffer, unsigned int size,
void *user_data);
#endif /* !defined(LIBTELNET_INCLUDE) */