author | viric@mandarina |
Thu, 21 Aug 2008 23:21:22 +0200 | |
changeset 93 | 7d9b7a6da507 |
parent 53 | 07500c5c53cb |
permissions | -rw-r--r-- |
53 | 1 |
/* |
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Terminal Mixer - multi-point multi-user access to terminal applications |
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Copyright (C) 2007 LluĂs Batlle i Rossell |
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Please find the license in the provided COPYING file. |
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*/ |
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36
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#include <stdlib.h> |
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#include "main.h" |
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#include "filter.h" |
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enum TState |
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{ |
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NOTHING, |
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RECEIVED_IAC, |
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RECEIVED_OPT, |
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SUBNEGOTIATED |
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}; |
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enum Chars |
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{ |
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IAC = 255, |
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SB = 250, |
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SE = 240 |
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}; |
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struct FTelnet |
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{ |
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struct FFilter base; |
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enum TState state; |
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}; |
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static void ftelnet_reset(struct FFilter *ff) |
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{ |
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struct FTelnet *ft = (struct FTelnet *) ff; |
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ft->state = NOTHING; |
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} |
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static int ftelnet_function(struct FFilter *ff, unsigned char c) |
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{ |
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struct FTelnet *ft = (struct FTelnet *) ff; |
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switch (ft->state) |
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{ |
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case NOTHING: |
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if (c == IAC) |
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{ |
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ft->state = RECEIVED_IAC; |
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ft->base.matched++; |
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} |
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break; |
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case RECEIVED_IAC: |
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if (c == SB) |
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{ |
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ft->state = SUBNEGOTIATED; |
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ft->base.matched++; |
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} else /* Received the control char */ |
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{ |
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ft->state = RECEIVED_OPT; |
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ft->base.matched++; |
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} |
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break; |
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case RECEIVED_OPT: |
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ft->base.matched++; |
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return 1; |
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break; |
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case SUBNEGOTIATED: |
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ft->base.matched++; |
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if (c == SE) |
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{ |
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return 1; |
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} |
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break; |
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} |
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return 0; |
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} |
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struct FFilter *new_ftelnet() |
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{ |
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struct FTelnet *ft; |
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ft = (struct FTelnet *) malloc(sizeof(*ft)); |
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|
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ft->state = NOTHING; |
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ft->base.matched = 0; |
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ft->base.function = ftelnet_function; |
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ft->base.reset = ftelnet_reset; |
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ft->base.callback = 0; |
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return (struct FFilter *) ft; |
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} |