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/* delimited, authenticated, encrypted connection */
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enum {
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Maxmsg = 4096, /* messages > Maxmsg bytes are truncated */
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};
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typedef struct SConn SConn;
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struct SConn {
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void *chan;
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int secretlen;
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int (*secret)(SConn*, uchar*, int);
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int (*read)(SConn*, uchar*, int); /* <0 if error; errmess in buffer */
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int (*write)(SConn*, uchar*, int);
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void (*free)(SConn*); /* also closes file descriptor */
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};
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SConn *newSConn(int); /* arg is open file descriptor */
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/*
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* secret(s,b,dir) sets secret for digest, encrypt, using the secretlen
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20 |
* bytes in b to form keys for the two directions;
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* set dir=0 in client, dir=1 in server
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*/
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/* error convention: write !message in-band */
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void writerr(SConn*, char*);
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26 |
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27 |
/*
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28 |
* returns -1 upon error, with error message in buf
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29 |
* call with buf of size Maxmsg+1
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*/
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31 |
int readstr(SConn*, char*);
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32 |
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void *emalloc(ulong); /* dies on failure; clears memory */
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void *erealloc(void*, ulong);
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char *estrdup(char*);
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