i've got a puzzling quesition about pcap-dlpi.c
In 0.5's pcap-dlpi.c:156, i see:
if (getmsg(p->fd, &ctl, &data, &flags) < 0) {
And at line 126:
static bpf_u_int32 ctlbuf[MAXDLBUF];
static struct strbuf ctl = {
MAXDLBUF,
0,
(char *)ctlbuf
};
Now, according to man getmsg:
...
int getmsg(int fildes, struct strbuf *ctlptr, struct strbuf
*dataptr, int *flagsp);
...
The fildes argument specifies a file descriptor referencing
an open stream. The ctlptr and dataptr arguments each point
to a strbuf structure, which contains the following members:
int maxlen; /* maximum buffer length */
int len; /* length of data */
char *buf; /* ptr to buffer */
...
And in particular:
The buf member points to a buffer into which the data or
control information is to be placed, and the maxlen member
indicates the maximum number of bytes this buffer can hold.
Now, if i'm not mistaken, MAXDLBUF is pcap-dlpi.c line 92:
#define MAXDLBUF 8192
Shouldn't static struct strbuf be:
static bpf_u_int32 ctlbuf[MAXDLBUF];
static struct strbuf ctl = {
sizeof(ctlbuf),
0,
(char *)ctlbuf
};
what am i missing?
And if i've got that right, shouldn't 153 be:
data.maxlen = sizeof(ctlbuf);
(we'll that's not exactly right, i think this would be better)
data.maxlen = p->bufsize;
mts.
-
This is the TCPDUMP workers list. It is archived at
http://www.tcpdump.org/lists/workers/index.html
To unsubscribe use mailto:[EMAIL PROTECTED]?body=unsubscribe
