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