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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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