| // 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 |
| 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 *); |
