1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
/* 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 *);
|