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/*-
* Copyright (c) 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "$Id: ip_trans.c,v 8.18 2001/06/25 15:19:25 skimo Exp $ (Berkeley) $Date: 2001/06/25 15:19:25 $";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <bitstring.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#ifdef __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include "../common/common.h"
#include "ip.h"
#include "ipc_def.h"
static char ibuf[2048]; /* Input buffer. */
static size_t ibuf_len; /* Length of current input. */
extern IPFUNLIST const ipfuns[];
/*
* vi_input --
* Read from the vi message queue.
*
* PUBLIC: int vi_input __P((IPVIWIN *, int));
*/
int
vi_input(IPVIWIN *ipviwin, int fd)
{
ssize_t nr;
/* Read waiting vi messages and translate to X calls. */
switch (nr = read(fd, ibuf + ibuf_len, sizeof(ibuf) - ibuf_len)) {
case 0:
return (0);
case -1:
return (-1);
default:
break;
}
ibuf_len += nr;
/* Parse to data end or partial message. */
(void)vi_translate(ipviwin, ibuf, &ibuf_len, NULL);
return (ibuf_len > 0);
}
/*
* vi_wsend --
* Construct and send an IP buffer, and wait for an answer.
*
* PUBLIC: int vi_wsend __P((IPVIWIN*, char *, IP_BUF *));
*/
int
vi_wsend(IPVIWIN *ipviwin, char *fmt, IP_BUF *ipbp)
{
fd_set rdfd;
ssize_t nr;
if (vi_send(ipviwin->ofd, fmt, ipbp))
return (1);
FD_ZERO(&rdfd);
ipbp->code = CODE_OOB;
for (;;) {
FD_SET(ipviwin->ifd, &rdfd);
if (select(ipviwin->ifd + 1, &rdfd, NULL, NULL, NULL) != 0)
return (-1);
/* Read waiting vi messages and translate to X calls. */
switch (nr =
read(ipviwin->ifd, ibuf + ibuf_len, sizeof(ibuf) - ibuf_len)) {
case 0:
return (0);
case -1:
return (-1);
default:
break;
}
ibuf_len += nr;
/* Parse to data end or partial message. */
(void)vi_translate(ipviwin, ibuf, &ibuf_len, ipbp);
if (ipbp->code != CODE_OOB)
break;
}
return (0);
}
/*
* vi_translate --
* Translate vi messages into function calls.
*
* PUBLIC: int vi_translate __P((IPVIWIN *, char *, size_t *, IP_BUF *));
*/
int
vi_translate(IPVIWIN *ipviwin, char *bp, size_t *lenp, IP_BUF *ipbp)
{
IP_BUF ipb;
size_t len, needlen;
u_int32_t *vp;
char *fmt, *p, *s_bp;
const char **vsp;
IPFunc fun;
for (s_bp = bp, len = *lenp; len > 0;) {
fmt = ipfuns[(ipb.code = bp[0])-1].format;
p = bp + IPO_CODE_LEN;
needlen = IPO_CODE_LEN;
for (; *fmt != '\0'; ++fmt)
switch (*fmt) {
case '1': /* Value #1. */
vp = &ipb.val1;
goto value;
case '2': /* Value #2. */
vp = &ipb.val2;
goto value;
case '3': /* Value #3. */
vp = &ipb.val3;
value: needlen += IPO_INT_LEN;
if (len < needlen)
goto partial;
memcpy(vp, p, IPO_INT_LEN);
*vp = ntohl(*vp);
p += IPO_INT_LEN;
break;
case 'a': /* String #1. */
vp = &ipb.len1;
vsp = &ipb.str1;
goto string;
case 'b': /* String #2. */
vp = &ipb.len2;
vsp = &ipb.str2;
string: needlen += IPO_INT_LEN;
if (len < needlen)
goto partial;
memcpy(vp, p, IPO_INT_LEN);
*vp = ntohl(*vp);
p += IPO_INT_LEN;
needlen += *vp;
if (len < needlen)
goto partial;
*vsp = p;
p += *vp;
break;
}
bp += needlen;
len -= needlen;
/*
* XXX
* Protocol error!?!?
*/
if (ipb.code >= SI_EVENT_SUP) {
len = 0;
break;
}
/*
* If we're waiting for a reply and we got it, return it, and
* leave any unprocessed data in the buffer. If we got a reply
* and we're not waiting for one, discard it -- callers wait
* for responses.
*/
if (ipb.code == SI_REPLY) {
if (ipbp == NULL)
continue;
*ipbp = ipb;
break;
}
/* Call the underlying routine. */
fun = *(IPFunc *)
(((char *)ipviwin->si_ops)+ipfuns[ipb.code - 1].offset);
if (fun != NULL &&
ipfuns[ipb.code - 1].unmarshall(ipviwin, &ipb, fun))
break;
}
partial:
if ((*lenp = len) != 0)
memmove(s_bp, bp, len);
return (0);
}
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