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@@ -1,1549 +0,0 @@
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-
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- * libtelnet - TELNET protocol handling library
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- *
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- * Sean Middleditch
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- * sean@sourcemud.org
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- *
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- * The author or authors of this code dedicate any and all copyright interest
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- * in this code to the public domain. We make this dedication for the benefit
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- * of the public at large and to the detriment of our heirs and successors. We
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- * intend this dedication to be an overt act of relinquishment in perpetuity of
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- * all present and future rights to this code under copyright law.
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- */
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-
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-#ifdef HAVE_CONFIG_H
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-#include <config.h>
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-#endif
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-#include <stdlib.h>
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-#include <string.h>
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-#include <stdio.h>
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-#include <errno.h>
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-#include <string.h>
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-#include <stdarg.h>
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-
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-
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-#if defined(_WIN32)
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-# define vsnprintf _vsnprintf
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-# define __func__ __FUNCTION__
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-# define ZLIB_WINAPI 1
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-#endif
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-
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-#if defined(HAVE_ZLIB)
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-# include <zlib.h>
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-#endif
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-
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-#include "libtelnet.h"
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-
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-
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-#if defined(__GNUC__) || __STDC_VERSION__ >= 199901L
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-# define INLINE __inline__
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-#else
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-# define INLINE
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-#endif
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-
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-
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-#define Q_US(q) ((q).state & 0x0F)
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-#define Q_HIM(q) (((q).state & 0xF0) >> 4)
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-#define Q_MAKE(us,him) ((us) | ((him) << 4))
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-
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-
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-#define NEGOTIATE_EVENT(telnet,cmd,opt) \
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- ev.type = (cmd); \
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- ev.neg.telopt = (opt); \
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- (telnet)->eh((telnet), &ev, (telnet)->ud);
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-
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-
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-enum telnet_state_t {
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- TELNET_STATE_DATA = 0,
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- TELNET_STATE_IAC,
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- TELNET_STATE_WILL,
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- TELNET_STATE_WONT,
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- TELNET_STATE_DO,
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- TELNET_STATE_DONT,
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- TELNET_STATE_SB,
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- TELNET_STATE_SB_DATA,
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- TELNET_STATE_SB_DATA_IAC
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-};
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-typedef enum telnet_state_t telnet_state_t;
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-
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-
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-struct telnet_t {
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-
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- void *ud;
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-
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- const telnet_telopt_t *telopts;
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-
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- telnet_event_handler_t eh;
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-#if defined(HAVE_ZLIB)
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-
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- z_stream *z;
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-#endif
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-
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- struct telnet_rfc1143_t *q;
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-
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- char *buffer;
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-
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- size_t buffer_size;
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-
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- size_t buffer_pos;
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-
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- enum telnet_state_t state;
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-
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- unsigned char flags;
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-
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- unsigned char sb_telopt;
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-
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- unsigned char q_size;
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-};
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-
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-
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-typedef struct telnet_rfc1143_t {
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- unsigned char telopt;
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- unsigned char state;
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-} telnet_rfc1143_t;
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-
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-
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-#define Q_NO 0
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-#define Q_YES 1
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-#define Q_WANTNO 2
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-#define Q_WANTYES 3
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-#define Q_WANTNO_OP 4
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-#define Q_WANTYES_OP 5
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-
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-
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-static const size_t _buffer_sizes[] = { 0, 512, 2048, 8192, 16384, };
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-static const size_t _buffer_sizes_count = sizeof(_buffer_sizes) /
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- sizeof(_buffer_sizes[0]);
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-
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-
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-static telnet_error_t _error(telnet_t *telnet, unsigned line,
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- const char* func, telnet_error_t err, int fatal, const char *fmt,
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- ...) {
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- telnet_event_t ev;
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- char buffer[512];
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- va_list va;
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-
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-
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- va_start(va, fmt);
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- vsnprintf(buffer, sizeof(buffer), fmt, va);
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- va_end(va);
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-
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-
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- ev.type = fatal ? TELNET_EV_ERROR : TELNET_EV_WARNING;
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- ev.error.file = __FILE__;
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- ev.error.func = func;
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- ev.error.line = line;
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- ev.error.msg = buffer;
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- telnet->eh(telnet, &ev, telnet->ud);
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-
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- return err;
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-}
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-
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-#if defined(HAVE_ZLIB)
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-
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- * initializes zlib for delating (compression), otherwise for inflating
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- * (decompression). returns TELNET_EOK on success, something else on
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- * failure.
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- */
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-telnet_error_t _init_zlib(telnet_t *telnet, int deflate, int err_fatal) {
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- z_stream *z;
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- int rs;
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-
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-
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- if (telnet->z != 0)
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- return _error(telnet, __LINE__, __func__, TELNET_EBADVAL,
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- err_fatal, "cannot initialize compression twice");
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-
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-
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- if ((z= (z_stream *)calloc(1, sizeof(z_stream))) == 0)
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- return _error(telnet, __LINE__, __func__, TELNET_ENOMEM, err_fatal,
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- "malloc() failed: %s", strerror(errno));
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-
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-
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- if (deflate) {
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- if ((rs = deflateInit(z, Z_DEFAULT_COMPRESSION)) != Z_OK) {
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- free(z);
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- return _error(telnet, __LINE__, __func__, TELNET_ECOMPRESS,
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- err_fatal, "deflateInit() failed: %s", zError(rs));
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- }
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- telnet->flags |= TELNET_PFLAG_DEFLATE;
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- } else {
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- if ((rs = inflateInit(z)) != Z_OK) {
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- free(z);
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- return _error(telnet, __LINE__, __func__, TELNET_ECOMPRESS,
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- err_fatal, "inflateInit() failed: %s", zError(rs));
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- }
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- telnet->flags &= ~TELNET_PFLAG_DEFLATE;
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- }
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-
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- telnet->z = z;
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-
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- return TELNET_EOK;
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-}
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-#endif
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-
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-
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-static void _send(telnet_t *telnet, const char *buffer,
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- size_t size) {
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- telnet_event_t ev;
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-
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-#if defined(HAVE_ZLIB)
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-
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- if (telnet->z != 0 && telnet->flags & TELNET_PFLAG_DEFLATE) {
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- char deflate_buffer[1024];
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- int rs;
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-
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-
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- telnet->z->next_in = (unsigned char *)buffer;
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- telnet->z->avail_in = (unsigned int)size;
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- telnet->z->next_out = (unsigned char *)deflate_buffer;
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- telnet->z->avail_out = sizeof(deflate_buffer);
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-
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-
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- while (telnet->z->avail_in > 0 || telnet->z->avail_out == 0) {
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-
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- if ((rs = deflate(telnet->z, Z_SYNC_FLUSH)) != Z_OK) {
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- _error(telnet, __LINE__, __func__, TELNET_ECOMPRESS, 1,
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- "deflate() failed: %s", zError(rs));
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- deflateEnd(telnet->z);
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- free(telnet->z);
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- telnet->z = 0;
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- break;
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- }
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-
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-
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- ev.type = TELNET_EV_SEND;
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- ev.data.buffer = deflate_buffer;
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- ev.data.size = sizeof(deflate_buffer) - telnet->z->avail_out;
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- telnet->eh(telnet, &ev, telnet->ud);
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-
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-
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- telnet->z->next_out = (unsigned char *)deflate_buffer;
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- telnet->z->avail_out = sizeof(deflate_buffer);
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- }
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-
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-
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- return;
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- }
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-#endif
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-
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- ev.type = TELNET_EV_SEND;
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- ev.data.buffer = buffer;
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- ev.data.size = size;
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- telnet->eh(telnet, &ev, telnet->ud);
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-}
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-
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-
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-#define _sendu(t, d, s) _send((t), (const char*)(d), (s))
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-
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-
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- * check if we (local) supports it, otherwise we check if he (remote)
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- * supports it. return non-zero if supported, zero if not supported.
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- */
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-static INLINE int _check_telopt(telnet_t *telnet, unsigned char telopt,
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- int us) {
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- int i;
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-
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-
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- if (telnet->telopts == 0)
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- return 0;
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-
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-
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- for (i = 0; telnet->telopts[i].telopt != -1; ++i) {
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- if (telnet->telopts[i].telopt == telopt) {
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- if (us && telnet->telopts[i].us == TELNET_WILL)
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- return 1;
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- else if (!us && telnet->telopts[i].him == TELNET_DO)
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- return 1;
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- else
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- return 0;
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- }
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- }
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-
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-
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- return 0;
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-}
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-
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-
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-static INLINE telnet_rfc1143_t _get_rfc1143(telnet_t *telnet,
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- unsigned char telopt) {
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- telnet_rfc1143_t empty;
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- int i;
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-
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-
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- for (i = 0; i != telnet->q_size; ++i) {
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- if (telnet->q[i].telopt == telopt) {
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- return telnet->q[i];
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- }
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- }
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-
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-
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- empty.telopt = telopt;
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- empty.state = 0;
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- return empty;
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-}
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-
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-
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-static INLINE void _set_rfc1143(telnet_t *telnet, unsigned char telopt,
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- char us, char him) {
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- telnet_rfc1143_t *qtmp;
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- int i;
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-
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-
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- for (i = 0; i != telnet->q_size; ++i) {
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- if (telnet->q[i].telopt == telopt) {
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- telnet->q[i].state = Q_MAKE(us,him);
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- return;
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- }
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- }
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-
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-
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- * by 4 (four) elements and put the telopt into it; bail on allocation
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- * error. we go by four because it seems like a reasonable guess as
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- * to the number of enabled options for most simple code, and it
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- * allows for an acceptable number of reallocations for complex code.
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- */
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- if ((qtmp = (telnet_rfc1143_t *)realloc(telnet->q,
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- sizeof(telnet_rfc1143_t) * (telnet->q_size + 4))) == 0) {
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- _error(telnet, __LINE__, __func__, TELNET_ENOMEM, 0,
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- "realloc() failed: %s", strerror(errno));
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- return;
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- }
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- memset(&qtmp[telnet->q_size], 0, sizeof(telnet_rfc1143_t) * 4);
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- telnet->q = qtmp;
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- telnet->q[telnet->q_size].telopt = telopt;
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- telnet->q[telnet->q_size].state = Q_MAKE(us, him);
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- telnet->q_size += 4;
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-}
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-
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-
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-static INLINE void _send_negotiate(telnet_t *telnet, unsigned char cmd,
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- unsigned char telopt) {
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- unsigned char bytes[3];
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- bytes[0] = TELNET_IAC;
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- bytes[1] = cmd;
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- bytes[2] = telopt;
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- _sendu(telnet, bytes, 3);
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-}
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-
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-
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-static void _negotiate(telnet_t *telnet, unsigned char telopt) {
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- telnet_event_t ev;
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- telnet_rfc1143_t q;
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-
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-
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- if (telnet->flags & TELNET_FLAG_PROXY) {
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- switch ((int)telnet->state) {
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- case TELNET_STATE_WILL:
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- NEGOTIATE_EVENT(telnet, TELNET_EV_WILL, telopt);
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- break;
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- case TELNET_STATE_WONT:
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- NEGOTIATE_EVENT(telnet, TELNET_EV_WONT, telopt);
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- break;
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- case TELNET_STATE_DO:
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- NEGOTIATE_EVENT(telnet, TELNET_EV_DO, telopt);
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- break;
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- case TELNET_STATE_DONT:
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- NEGOTIATE_EVENT(telnet, TELNET_EV_DONT, telopt);
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- break;
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- }
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- return;
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- }
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-
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-
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- q = _get_rfc1143(telnet, telopt);
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-
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-
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- switch ((int)telnet->state) {
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-
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- case TELNET_STATE_WILL:
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- switch (Q_HIM(q)) {
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- case Q_NO:
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- if (_check_telopt(telnet, telopt, 0)) {
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- _set_rfc1143(telnet, telopt, Q_US(q), Q_YES);
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- _send_negotiate(telnet, TELNET_DO, telopt);
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- NEGOTIATE_EVENT(telnet, TELNET_EV_WILL, telopt);
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- } else
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- _send_negotiate(telnet, TELNET_DONT, telopt);
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- break;
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- case Q_WANTNO:
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- _set_rfc1143(telnet, telopt, Q_US(q), Q_NO);
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- NEGOTIATE_EVENT(telnet, TELNET_EV_WONT, telopt);
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- _error(telnet, __LINE__, __func__, TELNET_EPROTOCOL, 0,
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- "DONT answered by WILL");
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- break;
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- case Q_WANTNO_OP:
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- _set_rfc1143(telnet, telopt, Q_US(q), Q_YES);
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- NEGOTIATE_EVENT(telnet, TELNET_EV_WILL, telopt);
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- _error(telnet, __LINE__, __func__, TELNET_EPROTOCOL, 0,
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- "DONT answered by WILL");
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- break;
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- case Q_WANTYES:
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- _set_rfc1143(telnet, telopt, Q_US(q), Q_YES);
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- NEGOTIATE_EVENT(telnet, TELNET_EV_WILL, telopt);
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- break;
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- case Q_WANTYES_OP:
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- _set_rfc1143(telnet, telopt, Q_US(q), Q_WANTNO);
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- _send_negotiate(telnet, TELNET_DONT, telopt);
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- NEGOTIATE_EVENT(telnet, TELNET_EV_WILL, telopt);
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- break;
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- }
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- break;
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-
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-
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- case TELNET_STATE_WONT:
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- switch (Q_HIM(q)) {
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- case Q_YES:
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- _set_rfc1143(telnet, telopt, Q_US(q), Q_NO);
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- _send_negotiate(telnet, TELNET_DONT, telopt);
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- NEGOTIATE_EVENT(telnet, TELNET_EV_WONT, telopt);
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- break;
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- case Q_WANTNO:
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- _set_rfc1143(telnet, telopt, Q_US(q), Q_NO);
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- NEGOTIATE_EVENT(telnet, TELNET_EV_WONT, telopt);
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- break;
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- case Q_WANTNO_OP:
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- _set_rfc1143(telnet, telopt, Q_US(q), Q_WANTYES);
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|
|
- NEGOTIATE_EVENT(telnet, TELNET_EV_DO, telopt);
|
|
|
- break;
|
|
|
- case Q_WANTYES:
|
|
|
- case Q_WANTYES_OP:
|
|
|
- _set_rfc1143(telnet, telopt, Q_US(q), Q_NO);
|
|
|
- break;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
-
|
|
|
- case TELNET_STATE_DO:
|
|
|
- switch (Q_US(q)) {
|
|
|
- case Q_NO:
|
|
|
- if (_check_telopt(telnet, telopt, 1)) {
|
|
|
- _set_rfc1143(telnet, telopt, Q_YES, Q_HIM(q));
|
|
|
- _send_negotiate(telnet, TELNET_WILL, telopt);
|
|
|
- NEGOTIATE_EVENT(telnet, TELNET_EV_DO, telopt);
|
|
|
- } else
|
|
|
- _send_negotiate(telnet, TELNET_WONT, telopt);
|
|
|
- break;
|
|
|
- case Q_WANTNO:
|
|
|
- _set_rfc1143(telnet, telopt, Q_NO, Q_HIM(q));
|
|
|
- NEGOTIATE_EVENT(telnet, TELNET_EV_DONT, telopt);
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_EPROTOCOL, 0,
|
|
|
- "WONT answered by DO");
|
|
|
- break;
|
|
|
- case Q_WANTNO_OP:
|
|
|
- _set_rfc1143(telnet, telopt, Q_YES, Q_HIM(q));
|
|
|
- NEGOTIATE_EVENT(telnet, TELNET_EV_DO, telopt);
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_EPROTOCOL, 0,
|
|
|
- "WONT answered by DO");
|
|
|
- break;
|
|
|
- case Q_WANTYES:
|
|
|
- _set_rfc1143(telnet, telopt, Q_YES, Q_HIM(q));
|
|
|
- NEGOTIATE_EVENT(telnet, TELNET_EV_DO, telopt);
|
|
|
- break;
|
|
|
- case Q_WANTYES_OP:
|
|
|
- _set_rfc1143(telnet, telopt, Q_WANTNO, Q_HIM(q));
|
|
|
- _send_negotiate(telnet, TELNET_WONT, telopt);
|
|
|
- NEGOTIATE_EVENT(telnet, TELNET_EV_DO, telopt);
|
|
|
- break;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
-
|
|
|
- case TELNET_STATE_DONT:
|
|
|
- switch (Q_US(q)) {
|
|
|
- case Q_YES:
|
|
|
- _set_rfc1143(telnet, telopt, Q_NO, Q_HIM(q));
|
|
|
- _send_negotiate(telnet, TELNET_WONT, telopt);
|
|
|
- NEGOTIATE_EVENT(telnet, TELNET_EV_DONT, telopt);
|
|
|
- break;
|
|
|
- case Q_WANTNO:
|
|
|
- _set_rfc1143(telnet, telopt, Q_NO, Q_HIM(q));
|
|
|
- NEGOTIATE_EVENT(telnet, TELNET_EV_WONT, telopt);
|
|
|
- break;
|
|
|
- case Q_WANTNO_OP:
|
|
|
- _set_rfc1143(telnet, telopt, Q_WANTYES, Q_HIM(q));
|
|
|
- _send_negotiate(telnet, TELNET_WILL, telopt);
|
|
|
- NEGOTIATE_EVENT(telnet, TELNET_EV_WILL, telopt);
|
|
|
- break;
|
|
|
- case Q_WANTYES:
|
|
|
- case Q_WANTYES_OP:
|
|
|
- _set_rfc1143(telnet, telopt, Q_NO, Q_HIM(q));
|
|
|
- break;
|
|
|
- }
|
|
|
- break;
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
- *
|
|
|
- * the algorithm and approach used here is kind of a hack,
|
|
|
- * but it reduces the number of memory allocations we have
|
|
|
- * to make.
|
|
|
- *
|
|
|
- * we copy the bytes back into the buffer, starting at the very
|
|
|
- * beginning, which makes it easy to handle the ENVIRON ESC
|
|
|
- * escape mechanism as well as ensure the variable name and
|
|
|
- * value strings are NUL-terminated, all while fitting inside
|
|
|
- * of the original buffer.
|
|
|
- */
|
|
|
-static int _environ_telnet(telnet_t *telnet, unsigned char type,
|
|
|
- char* buffer, size_t size) {
|
|
|
- telnet_event_t ev;
|
|
|
- struct telnet_environ_t *values = 0;
|
|
|
- char *c, *last, *out;
|
|
|
- size_t index, count;
|
|
|
-
|
|
|
-
|
|
|
- if (size == 0) {
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- if ((unsigned)buffer[0] != TELNET_ENVIRON_SEND &&
|
|
|
- (unsigned)buffer[0] != TELNET_ENVIRON_IS &&
|
|
|
- (unsigned)buffer[0] != TELNET_ENVIRON_INFO) {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_EPROTOCOL, 0,
|
|
|
- "telopt %d subneg has invalid command", type);
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- ev.environ.cmd = buffer[0];
|
|
|
-
|
|
|
-
|
|
|
- if (size == 1) {
|
|
|
-
|
|
|
- ev.environ.values = 0;
|
|
|
- ev.environ.size = 0;
|
|
|
-
|
|
|
-
|
|
|
- ev.type = TELNET_EV_ENVIRON;
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
-
|
|
|
- return 1;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- if ((unsigned)buffer[1] != TELNET_ENVIRON_VAR &&
|
|
|
- (unsigned)buffer[1] != TELNET_ENVIRON_USERVAR) {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_EPROTOCOL, 0,
|
|
|
- "telopt %d subneg missing variable type", type);
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- if ((unsigned)buffer[size - 1] == TELNET_ENVIRON_ESC) {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_EPROTOCOL, 0,
|
|
|
- "telopt %d subneg ends with ESC", type);
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- count = 0;
|
|
|
- for (c = buffer + 1; c < buffer + size; ++c) {
|
|
|
- if (*c == TELNET_ENVIRON_VAR || *c == TELNET_ENVIRON_USERVAR) {
|
|
|
- ++count;
|
|
|
- } else if (*c == TELNET_ENVIRON_ESC) {
|
|
|
-
|
|
|
- ++c;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- if ((values = (struct telnet_environ_t *)calloc(count,
|
|
|
- sizeof(struct telnet_environ_t))) == 0) {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_ENOMEM, 0,
|
|
|
- "calloc() failed: %s", strerror(errno));
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- out = buffer;
|
|
|
- c = buffer + 1;
|
|
|
- for (index = 0; index != count; ++index) {
|
|
|
-
|
|
|
- values[index].type = *c++;
|
|
|
-
|
|
|
-
|
|
|
- * bytes into our buffer */
|
|
|
- last = out;
|
|
|
- while (c < buffer + size) {
|
|
|
-
|
|
|
- if ((unsigned)*c == TELNET_ENVIRON_VAR ||
|
|
|
- (unsigned)*c == TELNET_ENVIRON_VALUE ||
|
|
|
- (unsigned)*c == TELNET_ENVIRON_USERVAR) {
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- if (*c == TELNET_ENVIRON_ESC) {
|
|
|
- ++c;
|
|
|
- }
|
|
|
-
|
|
|
- *out++ = *c++;
|
|
|
- }
|
|
|
- *out++ = '\0';
|
|
|
-
|
|
|
-
|
|
|
- values[index].var = last;
|
|
|
- values[index].value = "";
|
|
|
-
|
|
|
-
|
|
|
- * store the value; otherwise, store empty string */
|
|
|
- if (c < buffer + size && *c == TELNET_ENVIRON_VALUE) {
|
|
|
- ++c;
|
|
|
- last = out;
|
|
|
- while (c < buffer + size) {
|
|
|
-
|
|
|
- if ((unsigned)*c == TELNET_ENVIRON_VAR ||
|
|
|
- (unsigned)*c == TELNET_ENVIRON_USERVAR) {
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- if (*c == TELNET_ENVIRON_ESC) {
|
|
|
- ++c;
|
|
|
- }
|
|
|
-
|
|
|
- *out++ = *c++;
|
|
|
- }
|
|
|
- *out++ = '\0';
|
|
|
-
|
|
|
-
|
|
|
- values[index].value = last;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- ev.environ.values = values;
|
|
|
- ev.environ.size = count;
|
|
|
-
|
|
|
-
|
|
|
- ev.type = TELNET_EV_ENVIRON;
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
-
|
|
|
-
|
|
|
- free(values);
|
|
|
- return 1;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-static int _mssp_telnet(telnet_t *telnet, char* buffer, size_t size) {
|
|
|
- telnet_event_t ev;
|
|
|
- struct telnet_environ_t *values;
|
|
|
- char *var = 0;
|
|
|
- char *c, *last, *out;
|
|
|
- size_t i, count;
|
|
|
- unsigned char next_type;
|
|
|
-
|
|
|
-
|
|
|
- if (size == 0) {
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- if ((unsigned)buffer[0] != TELNET_MSSP_VAR) {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_EPROTOCOL, 0,
|
|
|
- "MSSP subnegotiation has invalid data");
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- for (count = 0, i = 0; i != size; ++i) {
|
|
|
- if ((unsigned)buffer[i] == TELNET_MSSP_VAL) {
|
|
|
- ++count;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- if ((values = (struct telnet_environ_t *)calloc(count,
|
|
|
- sizeof(struct telnet_environ_t))) == 0) {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_ENOMEM, 0,
|
|
|
- "calloc() failed: %s", strerror(errno));
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
- ev.mssp.values = values;
|
|
|
- ev.mssp.size = count;
|
|
|
-
|
|
|
-
|
|
|
- out = last = buffer;
|
|
|
- next_type = buffer[0];
|
|
|
- for (i = 0, c = buffer + 1; c < buffer + size;) {
|
|
|
-
|
|
|
- while (c < buffer + size && (unsigned)*c != TELNET_MSSP_VAR &&
|
|
|
- (unsigned)*c != TELNET_MSSP_VAL) {
|
|
|
- *out++ = *c++;
|
|
|
- }
|
|
|
- *out++ = '\0';
|
|
|
-
|
|
|
-
|
|
|
- if (next_type == TELNET_MSSP_VAR) {
|
|
|
- var = last;
|
|
|
- } else if (next_type == TELNET_MSSP_VAL && var != 0) {
|
|
|
- values[i].var = var;
|
|
|
- values[i].value = last;
|
|
|
- ++i;
|
|
|
- } else {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_EPROTOCOL, 0,
|
|
|
- "invalid MSSP subnegotiation data");
|
|
|
- free(values);
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- last = out;
|
|
|
- next_type = *c++;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- ev.type = TELNET_EV_MSSP;
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
-
|
|
|
-
|
|
|
- free(values);
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-static int _zmp_telnet(telnet_t *telnet, const char* buffer, size_t size) {
|
|
|
- telnet_event_t ev;
|
|
|
- char **argv;
|
|
|
- const char *c;
|
|
|
- size_t i, argc;
|
|
|
-
|
|
|
-
|
|
|
- if (size == 0 || buffer[size - 1] != 0) {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_EPROTOCOL, 0,
|
|
|
- "incomplete ZMP frame");
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- for (argc = 0, c = buffer; c != buffer + size; ++argc)
|
|
|
- c += strlen(c) + 1;
|
|
|
-
|
|
|
-
|
|
|
- if ((argv = (char **)calloc(argc, sizeof(char *))) == 0) {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_ENOMEM, 0,
|
|
|
- "calloc() failed: %s", strerror(errno));
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- for (i = 0, c = buffer; i != argc; ++i) {
|
|
|
- argv[i] = (char *)c;
|
|
|
- c += strlen(c) + 1;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- ev.type = TELNET_EV_ZMP;
|
|
|
- ev.zmp.argv = (const char**)argv;
|
|
|
- ev.zmp.argc = argc;
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
-
|
|
|
-
|
|
|
- free(argv);
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-static int _ttype_telnet(telnet_t *telnet, const char* buffer, size_t size) {
|
|
|
- telnet_event_t ev;
|
|
|
-
|
|
|
-
|
|
|
- if (size == 0) {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_EPROTOCOL, 0,
|
|
|
- "incomplete TERMINAL-TYPE request");
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- if (buffer[0] != TELNET_TTYPE_IS &&
|
|
|
- buffer[0] != TELNET_TTYPE_SEND) {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_EPROTOCOL, 0,
|
|
|
- "TERMINAL-TYPE request has invalid type");
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- if (buffer[0] == TELNET_TTYPE_IS) {
|
|
|
- char *name;
|
|
|
-
|
|
|
-
|
|
|
- if ((name = (char *)malloc(size)) == 0) {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_ENOMEM, 0,
|
|
|
- "malloc() failed: %s", strerror(errno));
|
|
|
- return 0;
|
|
|
- }
|
|
|
- memcpy(name, buffer + 1, size - 1);
|
|
|
- name[size - 1] = '\0';
|
|
|
-
|
|
|
- ev.type = TELNET_EV_TTYPE;
|
|
|
- ev.ttype.cmd = TELNET_TTYPE_IS;
|
|
|
- ev.ttype.name = name;
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
-
|
|
|
-
|
|
|
- free(name);
|
|
|
- } else {
|
|
|
- ev.type = TELNET_EV_TTYPE;
|
|
|
- ev.ttype.cmd = TELNET_TTYPE_SEND;
|
|
|
- ev.ttype.name = 0;
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
- }
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
- * must be aborted and reprocessed due to COMPRESS2 being activated
|
|
|
- */
|
|
|
-static int _subnegotiate(telnet_t *telnet) {
|
|
|
- telnet_event_t ev;
|
|
|
-
|
|
|
-
|
|
|
- ev.type = TELNET_EV_SUBNEGOTIATION;
|
|
|
- ev.sub.telopt = telnet->sb_telopt;
|
|
|
- ev.sub.buffer = telnet->buffer;
|
|
|
- ev.sub.size = telnet->buffer_pos;
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
-
|
|
|
- switch (telnet->sb_telopt) {
|
|
|
-#if defined(HAVE_ZLIB)
|
|
|
-
|
|
|
- * start handling the compressed stream if it's not already.
|
|
|
- */
|
|
|
- case TELNET_TELOPT_COMPRESS2:
|
|
|
- if (telnet->sb_telopt == TELNET_TELOPT_COMPRESS2) {
|
|
|
- if (_init_zlib(telnet, 0, 1) != TELNET_EOK)
|
|
|
- return 0;
|
|
|
-
|
|
|
-
|
|
|
- ev.type = TELNET_EV_COMPRESS;
|
|
|
- ev.compress.state = 1;
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
- return 1;
|
|
|
- }
|
|
|
- return 0;
|
|
|
-#endif
|
|
|
-
|
|
|
-
|
|
|
- case TELNET_TELOPT_ZMP:
|
|
|
- return _zmp_telnet(telnet, telnet->buffer, telnet->buffer_pos);
|
|
|
- case TELNET_TELOPT_TTYPE:
|
|
|
- return _ttype_telnet(telnet, telnet->buffer, telnet->buffer_pos);
|
|
|
- case TELNET_TELOPT_ENVIRON:
|
|
|
- case TELNET_TELOPT_NEW_ENVIRON:
|
|
|
- return _environ_telnet(telnet, telnet->sb_telopt, telnet->buffer,
|
|
|
- telnet->buffer_pos);
|
|
|
- case TELNET_TELOPT_MSSP:
|
|
|
- return _mssp_telnet(telnet, telnet->buffer, telnet->buffer_pos);
|
|
|
- default:
|
|
|
- return 0;
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-telnet_t *telnet_init(const telnet_telopt_t *telopts,
|
|
|
- telnet_event_handler_t eh, unsigned char flags, void *user_data) {
|
|
|
-
|
|
|
- struct telnet_t *telnet = (telnet_t*)calloc(1, sizeof(telnet_t));
|
|
|
- if (telnet == 0)
|
|
|
- return 0;
|
|
|
-
|
|
|
-
|
|
|
- telnet->ud = user_data;
|
|
|
- telnet->telopts = telopts;
|
|
|
- telnet->eh = eh;
|
|
|
- telnet->flags = flags;
|
|
|
-
|
|
|
- return telnet;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void telnet_free(telnet_t *telnet) {
|
|
|
-
|
|
|
- if (telnet->buffer != 0) {
|
|
|
- free(telnet->buffer);
|
|
|
- telnet->buffer = 0;
|
|
|
- telnet->buffer_size = 0;
|
|
|
- telnet->buffer_pos = 0;
|
|
|
- }
|
|
|
-
|
|
|
-#if defined(HAVE_ZLIB)
|
|
|
-
|
|
|
- if (telnet->z != 0) {
|
|
|
- if (telnet->flags & TELNET_PFLAG_DEFLATE)
|
|
|
- deflateEnd(telnet->z);
|
|
|
- else
|
|
|
- inflateEnd(telnet->z);
|
|
|
- free(telnet->z);
|
|
|
- telnet->z = 0;
|
|
|
- }
|
|
|
-#endif
|
|
|
-
|
|
|
-
|
|
|
- if (telnet->q) {
|
|
|
- free(telnet->q);
|
|
|
- telnet->q = 0;
|
|
|
- telnet->q_size = 0;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- free(telnet);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-static telnet_error_t _buffer_byte(telnet_t *telnet,
|
|
|
- unsigned char byte) {
|
|
|
- char *new_buffer;
|
|
|
- size_t i;
|
|
|
-
|
|
|
-
|
|
|
- if (telnet->buffer_pos == telnet->buffer_size) {
|
|
|
-
|
|
|
- for (i = 0; i != _buffer_sizes_count; ++i) {
|
|
|
- if (_buffer_sizes[i] == telnet->buffer_size) {
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- if (i >= _buffer_sizes_count - 1) {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_EOVERFLOW, 0,
|
|
|
- "subnegotiation buffer size limit reached");
|
|
|
- return TELNET_EOVERFLOW;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- new_buffer = (char *)realloc(telnet->buffer, _buffer_sizes[i + 1]);
|
|
|
- if (new_buffer == 0) {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_ENOMEM, 0,
|
|
|
- "realloc() failed");
|
|
|
- return TELNET_ENOMEM;
|
|
|
- }
|
|
|
-
|
|
|
- telnet->buffer = new_buffer;
|
|
|
- telnet->buffer_size = _buffer_sizes[i + 1];
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- telnet->buffer[telnet->buffer_pos++] = byte;
|
|
|
- return TELNET_EOK;
|
|
|
-}
|
|
|
-
|
|
|
-static void _process(telnet_t *telnet, const char *buffer, size_t size) {
|
|
|
- telnet_event_t ev;
|
|
|
- unsigned char byte;
|
|
|
- size_t i, start;
|
|
|
- for (i = start = 0; i != size; ++i) {
|
|
|
- byte = buffer[i];
|
|
|
- switch (telnet->state) {
|
|
|
-
|
|
|
- case TELNET_STATE_DATA:
|
|
|
-
|
|
|
- * switch states */
|
|
|
- if (byte == TELNET_IAC) {
|
|
|
- if (i != start) {
|
|
|
- ev.type = TELNET_EV_DATA;
|
|
|
- ev.data.buffer = buffer + start;
|
|
|
- ev.data.size = i - start;
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
- }
|
|
|
- telnet->state = TELNET_STATE_IAC;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
-
|
|
|
- case TELNET_STATE_IAC:
|
|
|
- switch (byte) {
|
|
|
-
|
|
|
- case TELNET_SB:
|
|
|
- telnet->state = TELNET_STATE_SB;
|
|
|
- break;
|
|
|
-
|
|
|
- case TELNET_WILL:
|
|
|
- telnet->state = TELNET_STATE_WILL;
|
|
|
- break;
|
|
|
- case TELNET_WONT:
|
|
|
- telnet->state = TELNET_STATE_WONT;
|
|
|
- break;
|
|
|
- case TELNET_DO:
|
|
|
- telnet->state = TELNET_STATE_DO;
|
|
|
- break;
|
|
|
- case TELNET_DONT:
|
|
|
- telnet->state = TELNET_STATE_DONT;
|
|
|
- break;
|
|
|
-
|
|
|
- case TELNET_IAC:
|
|
|
-
|
|
|
- ev.type = TELNET_EV_DATA;
|
|
|
- ev.data.buffer = (char*)&byte;
|
|
|
- ev.data.size = 1;
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
-
|
|
|
-
|
|
|
- start = i + 1;
|
|
|
- telnet->state = TELNET_STATE_DATA;
|
|
|
- break;
|
|
|
-
|
|
|
- default:
|
|
|
-
|
|
|
- ev.type = TELNET_EV_IAC;
|
|
|
- ev.iac.cmd = byte;
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
-
|
|
|
-
|
|
|
- start = i + 1;
|
|
|
- telnet->state = TELNET_STATE_DATA;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
-
|
|
|
- case TELNET_STATE_WILL:
|
|
|
- case TELNET_STATE_WONT:
|
|
|
- case TELNET_STATE_DO:
|
|
|
- case TELNET_STATE_DONT:
|
|
|
- _negotiate(telnet, byte);
|
|
|
- start = i + 1;
|
|
|
- telnet->state = TELNET_STATE_DATA;
|
|
|
- break;
|
|
|
-
|
|
|
-
|
|
|
- case TELNET_STATE_SB:
|
|
|
- telnet->sb_telopt = byte;
|
|
|
- telnet->buffer_pos = 0;
|
|
|
- telnet->state = TELNET_STATE_SB_DATA;
|
|
|
- break;
|
|
|
-
|
|
|
-
|
|
|
- case TELNET_STATE_SB_DATA:
|
|
|
-
|
|
|
- if (byte == TELNET_IAC) {
|
|
|
- telnet->state = TELNET_STATE_SB_DATA_IAC;
|
|
|
- } else if (telnet->sb_telopt == TELNET_TELOPT_COMPRESS && byte == TELNET_WILL) {
|
|
|
-
|
|
|
- * subnegotiation sequence (IAC SB 85 WILL SE) to start compression.
|
|
|
- * Subsequently MCCP version 2 was created in 2000 using TELOPT 86
|
|
|
- * and a valid subnegotiation (IAC SB 86 IAC SE). libtelnet for now
|
|
|
- * just captures and discards MCCPv1 sequences.
|
|
|
- */
|
|
|
- start = i + 2;
|
|
|
- telnet->state = TELNET_STATE_DATA;
|
|
|
-
|
|
|
- } else if (_buffer_byte(telnet, byte) != TELNET_EOK) {
|
|
|
- start = i + 1;
|
|
|
- telnet->state = TELNET_STATE_DATA;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
-
|
|
|
- case TELNET_STATE_SB_DATA_IAC:
|
|
|
- switch (byte) {
|
|
|
-
|
|
|
- case TELNET_SE:
|
|
|
-
|
|
|
- start = i + 1;
|
|
|
- telnet->state = TELNET_STATE_DATA;
|
|
|
-
|
|
|
-
|
|
|
- if (_subnegotiate(telnet) != 0) {
|
|
|
-
|
|
|
- * we have to re-invoke telnet_recv to get those
|
|
|
- * bytes inflated and abort trying to process the
|
|
|
- * remaining compressed bytes in the current _process
|
|
|
- * buffer argument
|
|
|
- */
|
|
|
- telnet_recv(telnet, &buffer[start], size - start);
|
|
|
- return;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
- case TELNET_IAC:
|
|
|
-
|
|
|
- if (_buffer_byte(telnet, TELNET_IAC) !=
|
|
|
- TELNET_EOK) {
|
|
|
- start = i + 1;
|
|
|
- telnet->state = TELNET_STATE_DATA;
|
|
|
- } else {
|
|
|
- telnet->state = TELNET_STATE_SB_DATA;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
- * content in subnegotiation buffer, then evaluate the
|
|
|
- * given command as an IAC code.
|
|
|
- */
|
|
|
- default:
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_EPROTOCOL, 0,
|
|
|
- "unexpected byte after IAC inside SB: %d",
|
|
|
- byte);
|
|
|
-
|
|
|
-
|
|
|
- start = i + 1;
|
|
|
- telnet->state = TELNET_STATE_IAC;
|
|
|
-
|
|
|
-
|
|
|
- * TELNET_STATE_SB_DATA_IAC about invoking telnet_recv()
|
|
|
- */
|
|
|
- if (_subnegotiate(telnet) != 0) {
|
|
|
- telnet_recv(telnet, &buffer[start], size - start);
|
|
|
- return;
|
|
|
- } else {
|
|
|
-
|
|
|
- * as a regular IAC command. we could use a goto, but
|
|
|
- * that would be gross.
|
|
|
- */
|
|
|
- _process(telnet, (char *)&byte, 1);
|
|
|
- }
|
|
|
- break;
|
|
|
- }
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- if (telnet->state == TELNET_STATE_DATA && i != start) {
|
|
|
- ev.type = TELNET_EV_DATA;
|
|
|
- ev.data.buffer = buffer + start;
|
|
|
- ev.data.size = i - start;
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void telnet_recv(telnet_t *telnet, const char *buffer,
|
|
|
- size_t size) {
|
|
|
-#if defined(HAVE_ZLIB)
|
|
|
-
|
|
|
- if (telnet->z != 0 && !(telnet->flags & TELNET_PFLAG_DEFLATE)) {
|
|
|
- char inflate_buffer[1024];
|
|
|
- int rs;
|
|
|
-
|
|
|
-
|
|
|
- telnet->z->next_in = (unsigned char*)buffer;
|
|
|
- telnet->z->avail_in = (unsigned int)size;
|
|
|
- telnet->z->next_out = (unsigned char *)inflate_buffer;
|
|
|
- telnet->z->avail_out = sizeof(inflate_buffer);
|
|
|
-
|
|
|
-
|
|
|
- while (telnet->z->avail_in > 0 || telnet->z->avail_out == 0) {
|
|
|
-
|
|
|
-
|
|
|
-
|
|
|
- rs = inflate(telnet->z, Z_SYNC_FLUSH);
|
|
|
-
|
|
|
-
|
|
|
- if (rs == Z_OK || rs == Z_STREAM_END)
|
|
|
- _process(telnet, inflate_buffer, sizeof(inflate_buffer) -
|
|
|
- telnet->z->avail_out);
|
|
|
- else
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_ECOMPRESS, 1,
|
|
|
- "inflate() failed: %s", zError(rs));
|
|
|
-
|
|
|
-
|
|
|
- telnet->z->next_out = (unsigned char *)inflate_buffer;
|
|
|
- telnet->z->avail_out = sizeof(inflate_buffer);
|
|
|
-
|
|
|
-
|
|
|
- if (rs != Z_OK) {
|
|
|
- telnet_event_t ev;
|
|
|
-
|
|
|
-
|
|
|
- inflateEnd(telnet->z);
|
|
|
- free(telnet->z);
|
|
|
- telnet->z = 0;
|
|
|
-
|
|
|
-
|
|
|
- ev.type = TELNET_EV_COMPRESS;
|
|
|
- ev.compress.state = 0;
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
-
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- } else
|
|
|
-#endif
|
|
|
- _process(telnet, buffer, size);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void telnet_iac(telnet_t *telnet, unsigned char cmd) {
|
|
|
- unsigned char bytes[2];
|
|
|
- bytes[0] = TELNET_IAC;
|
|
|
- bytes[1] = cmd;
|
|
|
- _sendu(telnet, bytes, 2);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void telnet_negotiate(telnet_t *telnet, unsigned char cmd,
|
|
|
- unsigned char telopt) {
|
|
|
- telnet_rfc1143_t q;
|
|
|
-
|
|
|
-
|
|
|
- if (telnet->flags & TELNET_FLAG_PROXY) {
|
|
|
- unsigned char bytes[3];
|
|
|
- bytes[0] = TELNET_IAC;
|
|
|
- bytes[1] = cmd;
|
|
|
- bytes[2] = telopt;
|
|
|
- _sendu(telnet, bytes, 3);
|
|
|
- return;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- q = _get_rfc1143(telnet, telopt);
|
|
|
-
|
|
|
- switch (cmd) {
|
|
|
-
|
|
|
- case TELNET_WILL:
|
|
|
- switch (Q_US(q)) {
|
|
|
- case Q_NO:
|
|
|
- _set_rfc1143(telnet, telopt, Q_WANTYES, Q_HIM(q));
|
|
|
- _send_negotiate(telnet, TELNET_WILL, telopt);
|
|
|
- break;
|
|
|
- case Q_WANTNO:
|
|
|
- _set_rfc1143(telnet, telopt, Q_WANTNO_OP, Q_HIM(q));
|
|
|
- break;
|
|
|
- case Q_WANTYES_OP:
|
|
|
- _set_rfc1143(telnet, telopt, Q_WANTYES, Q_HIM(q));
|
|
|
- break;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
-
|
|
|
- case TELNET_WONT:
|
|
|
- switch (Q_US(q)) {
|
|
|
- case Q_YES:
|
|
|
- _set_rfc1143(telnet, telopt, Q_WANTNO, Q_HIM(q));
|
|
|
- _send_negotiate(telnet, TELNET_WONT, telopt);
|
|
|
- break;
|
|
|
- case Q_WANTYES:
|
|
|
- _set_rfc1143(telnet, telopt, Q_WANTYES_OP, Q_HIM(q));
|
|
|
- break;
|
|
|
- case Q_WANTNO_OP:
|
|
|
- _set_rfc1143(telnet, telopt, Q_WANTNO, Q_HIM(q));
|
|
|
- break;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
-
|
|
|
- case TELNET_DO:
|
|
|
- switch (Q_HIM(q)) {
|
|
|
- case Q_NO:
|
|
|
- _set_rfc1143(telnet, telopt, Q_US(q), Q_WANTYES);
|
|
|
- _send_negotiate(telnet, TELNET_DO, telopt);
|
|
|
- break;
|
|
|
- case Q_WANTNO:
|
|
|
- _set_rfc1143(telnet, telopt, Q_US(q), Q_WANTNO_OP);
|
|
|
- break;
|
|
|
- case Q_WANTYES_OP:
|
|
|
- _set_rfc1143(telnet, telopt, Q_US(q), Q_WANTYES);
|
|
|
- break;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
-
|
|
|
- case TELNET_DONT:
|
|
|
- switch (Q_HIM(q)) {
|
|
|
- case Q_YES:
|
|
|
- _set_rfc1143(telnet, telopt, Q_US(q), Q_WANTNO);
|
|
|
- _send_negotiate(telnet, TELNET_DONT, telopt);
|
|
|
- break;
|
|
|
- case Q_WANTYES:
|
|
|
- _set_rfc1143(telnet, telopt, Q_US(q), Q_WANTYES_OP);
|
|
|
- break;
|
|
|
- case Q_WANTNO_OP:
|
|
|
- _set_rfc1143(telnet, telopt, Q_US(q), Q_WANTNO);
|
|
|
- break;
|
|
|
- }
|
|
|
- break;
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void telnet_send(telnet_t *telnet, const char *buffer,
|
|
|
- size_t size) {
|
|
|
- size_t i, l;
|
|
|
-
|
|
|
- for (l = i = 0; i != size; ++i) {
|
|
|
-
|
|
|
- if (buffer[i] == (char)TELNET_IAC) {
|
|
|
-
|
|
|
- if (i != l) {
|
|
|
- _send(telnet, buffer + l, i - l);
|
|
|
- }
|
|
|
- l = i + 1;
|
|
|
-
|
|
|
-
|
|
|
- telnet_iac(telnet, TELNET_IAC);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- if (i != l) {
|
|
|
- _send(telnet, buffer + l, i - l);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void telnet_begin_sb(telnet_t *telnet, unsigned char telopt) {
|
|
|
- unsigned char sb[3];
|
|
|
- sb[0] = TELNET_IAC;
|
|
|
- sb[1] = TELNET_SB;
|
|
|
- sb[2] = telopt;
|
|
|
- _sendu(telnet, sb, 3);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-
|
|
|
-void telnet_subnegotiation(telnet_t *telnet, unsigned char telopt,
|
|
|
- const char *buffer, size_t size) {
|
|
|
- unsigned char bytes[5];
|
|
|
- bytes[0] = TELNET_IAC;
|
|
|
- bytes[1] = TELNET_SB;
|
|
|
- bytes[2] = telopt;
|
|
|
- bytes[3] = TELNET_IAC;
|
|
|
- bytes[4] = TELNET_SE;
|
|
|
-
|
|
|
- _sendu(telnet, bytes, 3);
|
|
|
- telnet_send(telnet, buffer, size);
|
|
|
- _sendu(telnet, bytes + 3, 2);
|
|
|
-
|
|
|
-#if defined(HAVE_ZLIB)
|
|
|
-
|
|
|
- * make sure all further data is compressed if not already.
|
|
|
- */
|
|
|
- if (telnet->flags & TELNET_FLAG_PROXY &&
|
|
|
- telopt == TELNET_TELOPT_COMPRESS2) {
|
|
|
- telnet_event_t ev;
|
|
|
-
|
|
|
- if (_init_zlib(telnet, 1, 1) != TELNET_EOK)
|
|
|
- return;
|
|
|
-
|
|
|
-
|
|
|
- ev.type = TELNET_EV_COMPRESS;
|
|
|
- ev.compress.state = 1;
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
- }
|
|
|
-#endif
|
|
|
-}
|
|
|
-
|
|
|
-void telnet_begin_compress2(telnet_t *telnet) {
|
|
|
-#if defined(HAVE_ZLIB)
|
|
|
- static const unsigned char compress2[] = { TELNET_IAC, TELNET_SB,
|
|
|
- TELNET_TELOPT_COMPRESS2, TELNET_IAC, TELNET_SE };
|
|
|
-
|
|
|
- telnet_event_t ev;
|
|
|
-
|
|
|
-
|
|
|
- if (_init_zlib(telnet, 1, 0) != TELNET_EOK)
|
|
|
- return;
|
|
|
-
|
|
|
-
|
|
|
- * instead of passing through _send because _send would result in
|
|
|
- * the compress marker itself being compressed.
|
|
|
- */
|
|
|
- ev.type = TELNET_EV_SEND;
|
|
|
- ev.data.buffer = (const char*)compress2;
|
|
|
- ev.data.size = sizeof(compress2);
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
-
|
|
|
-
|
|
|
- ev.type = TELNET_EV_COMPRESS;
|
|
|
- ev.compress.state = 1;
|
|
|
- telnet->eh(telnet, &ev, telnet->ud);
|
|
|
-#endif
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-int telnet_vprintf(telnet_t *telnet, const char *fmt, va_list va) {
|
|
|
- static const char CRLF[] = { '\r', '\n' };
|
|
|
- static const char CRNUL[] = { '\r', '\0' };
|
|
|
- char buffer[1024];
|
|
|
- char *output = buffer;
|
|
|
- int rs, i, l;
|
|
|
-
|
|
|
-
|
|
|
- rs = vsnprintf(buffer, sizeof(buffer), fmt, va);
|
|
|
- if (rs >= sizeof(buffer)) {
|
|
|
- output = (char*)malloc(rs + 1);
|
|
|
- if (output == 0) {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_ENOMEM, 0,
|
|
|
- "malloc() failed: %s", strerror(errno));
|
|
|
- return -1;
|
|
|
- }
|
|
|
- rs = vsnprintf(output, rs + 1, fmt, va);
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- for (l = i = 0; i != rs; ++i) {
|
|
|
-
|
|
|
- if (output[i] == (char)TELNET_IAC || output[i] == '\r' ||
|
|
|
- output[i] == '\n') {
|
|
|
-
|
|
|
- if (i != l)
|
|
|
- _send(telnet, output + l, i - l);
|
|
|
- l = i + 1;
|
|
|
-
|
|
|
-
|
|
|
- if (output[i] == (char)TELNET_IAC)
|
|
|
- telnet_iac(telnet, TELNET_IAC);
|
|
|
-
|
|
|
- else if (output[i] == '\r')
|
|
|
- _send(telnet, CRNUL, 2);
|
|
|
-
|
|
|
- else if (output[i] == '\n')
|
|
|
- _send(telnet, CRLF, 2);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- if (i != l) {
|
|
|
- _send(telnet, output + l, i - l);
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- if (output != buffer) {
|
|
|
- free(output);
|
|
|
- }
|
|
|
-
|
|
|
- return rs;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-int telnet_printf(telnet_t *telnet, const char *fmt, ...) {
|
|
|
- va_list va;
|
|
|
- int rs;
|
|
|
-
|
|
|
- va_start(va, fmt);
|
|
|
- rs = telnet_vprintf(telnet, fmt, va);
|
|
|
- va_end(va);
|
|
|
-
|
|
|
- return rs;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-int telnet_raw_vprintf(telnet_t *telnet, const char *fmt, va_list va) {
|
|
|
- char buffer[1024];
|
|
|
- char *output = buffer;
|
|
|
- int rs;
|
|
|
-
|
|
|
-
|
|
|
- rs = vsnprintf(buffer, sizeof(buffer), fmt, va);
|
|
|
- if (rs >= sizeof(buffer)) {
|
|
|
- output = (char*)malloc(rs + 1);
|
|
|
- if (output == 0) {
|
|
|
- _error(telnet, __LINE__, __func__, TELNET_ENOMEM, 0,
|
|
|
- "malloc() failed: %s", strerror(errno));
|
|
|
- return -1;
|
|
|
- }
|
|
|
- rs = vsnprintf(output, rs + 1, fmt, va);
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- telnet_send(telnet, output, rs);
|
|
|
-
|
|
|
-
|
|
|
- if (output != buffer) {
|
|
|
- free(output);
|
|
|
- }
|
|
|
-
|
|
|
- return rs;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-int telnet_raw_printf(telnet_t *telnet, const char *fmt, ...) {
|
|
|
- va_list va;
|
|
|
- int rs;
|
|
|
-
|
|
|
- va_start(va, fmt);
|
|
|
- rs = telnet_raw_vprintf(telnet, fmt, va);
|
|
|
- va_end(va);
|
|
|
-
|
|
|
- return rs;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void telnet_begin_newenviron(telnet_t *telnet, unsigned char cmd) {
|
|
|
- telnet_begin_sb(telnet, TELNET_TELOPT_NEW_ENVIRON);
|
|
|
- telnet_send(telnet, (const char *)&cmd, 1);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void telnet_newenviron_value(telnet_t *telnet, unsigned char type,
|
|
|
- const char *string) {
|
|
|
- telnet_send(telnet, (const char*)&type, 1);
|
|
|
-
|
|
|
- if (string != 0) {
|
|
|
- telnet_send(telnet, string, strlen(string));
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void telnet_ttype_send(telnet_t *telnet) {
|
|
|
- static const unsigned char SEND[] = { TELNET_IAC, TELNET_SB,
|
|
|
- TELNET_TELOPT_TTYPE, TELNET_TTYPE_SEND, TELNET_IAC, TELNET_SE };
|
|
|
- _sendu(telnet, SEND, sizeof(SEND));
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void telnet_ttype_is(telnet_t *telnet, const char* ttype) {
|
|
|
- static const unsigned char IS[] = { TELNET_IAC, TELNET_SB,
|
|
|
- TELNET_TELOPT_TTYPE, TELNET_TTYPE_IS };
|
|
|
- _sendu(telnet, IS, sizeof(IS));
|
|
|
- _send(telnet, ttype, strlen(ttype));
|
|
|
- telnet_finish_sb(telnet);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void telnet_send_zmp(telnet_t *telnet, size_t argc, const char **argv) {
|
|
|
- size_t i;
|
|
|
-
|
|
|
-
|
|
|
- telnet_begin_zmp(telnet, argv[0]);
|
|
|
-
|
|
|
-
|
|
|
- for (i = 1; i != argc; ++i)
|
|
|
- telnet_zmp_arg(telnet, argv[i]);
|
|
|
-
|
|
|
-
|
|
|
- telnet_finish_zmp(telnet);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void telnet_send_vzmpv(telnet_t *telnet, va_list va) {
|
|
|
- const char* arg;
|
|
|
-
|
|
|
-
|
|
|
- telnet_begin_sb(telnet, TELNET_TELOPT_ZMP);
|
|
|
-
|
|
|
-
|
|
|
- while ((arg = va_arg(va, const char *)) != 0)
|
|
|
- telnet_zmp_arg(telnet, arg);
|
|
|
-
|
|
|
-
|
|
|
- telnet_finish_zmp(telnet);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void telnet_send_zmpv(telnet_t *telnet, ...) {
|
|
|
- va_list va;
|
|
|
-
|
|
|
- va_start(va, telnet);
|
|
|
- telnet_send_vzmpv(telnet, va);
|
|
|
- va_end(va);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void telnet_begin_zmp(telnet_t *telnet, const char *cmd) {
|
|
|
- telnet_begin_sb(telnet, TELNET_TELOPT_ZMP);
|
|
|
- telnet_zmp_arg(telnet, cmd);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void telnet_zmp_arg(telnet_t *telnet, const char* arg) {
|
|
|
- telnet_send(telnet, arg, strlen(arg) + 1);
|
|
|
-}
|