static int
recv_ack(int fd, int size, const char *what, char *bufp, char *ebuf, int *uerror)
{
union DL_primitives *dlp;
struct strbuf ctl;
int flags;
/*
* Clear out "*uerror", so it's only set for DL_ERROR_ACK/DL_SYSERR,
* making that the only place where EBUSY is treated specially.
*/
if (uerror != NULL)
*uerror = 0;
ctl.maxlen = MAXDLBUF;
ctl.len = 0;
ctl.buf = bufp;
flags = 0;
if (getmsg(fd, &ctl, (struct strbuf*)NULL, &flags) < 0) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "recv_ack: %s getmsg: %s",
what, pcap_strerror(errno));
return (PCAP_ERROR);
}
dlp = MAKE_DL_PRIMITIVES(ctl.buf);
switch (dlp->dl_primitive) {
case DL_INFO_ACK:
case DL_BIND_ACK:
case DL_OK_ACK:
#ifdef DL_HP_PPA_ACK
case DL_HP_PPA_ACK:
#endif
/* These are OK */
break;
case DL_ERROR_ACK:
switch (dlp->error_ack.dl_errno) {
case DL_SYSERR:
if (uerror != NULL)
*uerror = dlp->error_ack.dl_unix_errno;
snprintf(ebuf, PCAP_ERRBUF_SIZE,
"recv_ack: %s: UNIX error - %s",
what, pcap_strerror(dlp->error_ack.dl_unix_errno));
if (dlp->error_ack.dl_unix_errno == EPERM ||
dlp->error_ack.dl_unix_errno == EACCES)
return (PCAP_ERROR_PERM_DENIED);
break;
default:
snprintf(ebuf, PCAP_ERRBUF_SIZE, "recv_ack: %s: %s",
what, dlstrerror(dlp->error_ack.dl_errno));
if (dlp->error_ack.dl_errno == DL_BADPPA)
return (PCAP_ERROR_NO_SUCH_DEVICE);
else if (dlp->error_ack.dl_errno == DL_ACCESS)
return (PCAP_ERROR_PERM_DENIED);
break;
}
return (PCAP_ERROR);
default:
snprintf(ebuf, PCAP_ERRBUF_SIZE,
"recv_ack: %s: Unexpected primitive ack %s",
what, dlprim(dlp->dl_primitive));
return (PCAP_ERROR);
}
if (ctl.len < size) {
snprintf(ebuf, PCAP_ERRBUF_SIZE,
"recv_ack: %s: Ack too small (%d < %d)",
what, ctl.len, size);
return (PCAP_ERROR);
}
return (ctl.len);
}
static int
recv_ack(int fd, int size, const char *what, char *bufp, char *ebuf, int *uerror)
{
union DL_primitives *dlp;
struct strbuf ctl;
int flags;
ctl.maxlen = MAXDLBUF;
ctl.len = 0;
ctl.buf = bufp;
flags = 0;
if (getmsg(fd, &ctl, (struct strbuf*)NULL, &flags) < 0) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "recv_ack: %s getmsg: %s",
what, pcap_strerror(errno));
return (-1);
}
dlp = (union DL_primitives *) ctl.buf;
switch (dlp->dl_primitive) {
case DL_INFO_ACK:
case DL_BIND_ACK:
case DL_OK_ACK:
#ifdef DL_HP_PPA_ACK
case DL_HP_PPA_ACK:
#endif
/* These are OK */
break;
case DL_ERROR_ACK:
switch (dlp->error_ack.dl_errno) {
case DL_SYSERR:
if (uerror != NULL)
*uerror = dlp->error_ack.dl_unix_errno;
snprintf(ebuf, PCAP_ERRBUF_SIZE,
"recv_ack: %s: UNIX error - %s",
what, pcap_strerror(dlp->error_ack.dl_unix_errno));
break;
default:
if (uerror != NULL)
*uerror = 0;
snprintf(ebuf, PCAP_ERRBUF_SIZE, "recv_ack: %s: %s",
what, dlstrerror(dlp->error_ack.dl_errno));
break;
}
return (-1);
default:
if (uerror != NULL)
*uerror = 0;
snprintf(ebuf, PCAP_ERRBUF_SIZE,
"recv_ack: %s: Unexpected primitive ack %s",
what, dlprim(dlp->dl_primitive));
return (-1);
}
if (ctl.len < size) {
if (uerror != NULL)
*uerror = 0;
snprintf(ebuf, PCAP_ERRBUF_SIZE,
"recv_ack: %s: Ack too small (%d < %d)",
what, ctl.len, size);
return (-1);
}
return (ctl.len);
}