| /* 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 *); |
| |
