freebsd-dev/lib/libnetgraph/sock.c
Ruslan Ermilov d15ff41778 - Added three new interfaces, NgAllocRecvMsg(), NgAllocRecvAsciiMsg(),
and NgAllocRecvData(), that dynamically allocate buffer for a binary
  message, an ascii message, and a data packet, respectively.  The size
  of the allocated buffer is equal to the socket's receive buffer size
  to guarantee that a message or a data packet is not truncated.

- Get rid of the static size buffer in NgSendAsciiMsg().

OK'ed by:	archie, julian
2004-01-27 20:25:14 +00:00

301 lines
8.1 KiB
C

/*
* sock.c
*
* Copyright (c) 1996-1999 Whistle Communications, Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Whistle Communications;
* provided, however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Whistle
* Communications, Inc. trademarks, including the mark "WHISTLE
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
* such appears in the above copyright notice or in the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* Author: Archie Cobbs <archie@whistle.com>
*
* $Whistle: sock.c,v 1.12 1999/01/20 00:57:23 archie Exp $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <stdarg.h>
#include <netgraph/ng_message.h>
#include <netgraph/ng_socket.h>
#include "netgraph.h"
#include "internal.h"
/* The socket node type KLD */
#define NG_SOCKET_KLD "ng_socket.ko"
/*
* Create a socket type node and give it the supplied name.
* Return data and control sockets corresponding to the node.
* Returns -1 if error and sets errno.
*/
int
NgMkSockNode(const char *name, int *csp, int *dsp)
{
char namebuf[NG_NODESIZ];
int cs = -1; /* control socket */
int ds = -1; /* data socket */
int errnosv;
/* Empty name means no name */
if (name && *name == 0)
name = NULL;
/* Create control socket; this also creates the netgraph node.
If we get an EPROTONOSUPPORT then the socket node type is
not loaded, so load it and try again. */
if ((cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL)) < 0) {
if (errno == EPROTONOSUPPORT) {
if (kldload(NG_SOCKET_KLD) < 0) {
errnosv = errno;
if (_gNgDebugLevel >= 1)
NGLOG("can't load %s", NG_SOCKET_KLD);
goto errout;
}
cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL);
if (cs >= 0)
goto gotNode;
}
errnosv = errno;
if (_gNgDebugLevel >= 1)
NGLOG("socket");
goto errout;
}
gotNode:
/* Assign the node the desired name, if any */
if (name != NULL) {
u_char sbuf[NG_NODESIZ + NGSA_OVERHEAD];
struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
/* Assign name */
strlcpy(sg->sg_data, name, NG_NODESIZ);
sg->sg_family = AF_NETGRAPH;
sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
if (bind(cs, (struct sockaddr *) sg, sg->sg_len) < 0) {
errnosv = errno;
if (_gNgDebugLevel >= 1)
NGLOG("bind(%s)", sg->sg_data);
goto errout;
}
/* Save node name */
strlcpy(namebuf, name, sizeof(namebuf));
} else if (dsp != NULL) {
u_char rbuf[sizeof(struct ng_mesg) + sizeof(struct nodeinfo)];
struct ng_mesg *const resp = (struct ng_mesg *) rbuf;
struct nodeinfo *const ni = (struct nodeinfo *) resp->data;
/* Find out the node ID */
if (NgSendMsg(cs, ".", NGM_GENERIC_COOKIE,
NGM_NODEINFO, NULL, 0) < 0) {
errnosv = errno;
if (_gNgDebugLevel >= 1)
NGLOG("send nodeinfo");
goto errout;
}
if (NgRecvMsg(cs, resp, sizeof(rbuf), NULL) < 0) {
errnosv = errno;
if (_gNgDebugLevel >= 1)
NGLOG("recv nodeinfo");
goto errout;
}
/* Save node "name" */
snprintf(namebuf, sizeof(namebuf), "[%lx]", (u_long) ni->id);
}
/* Create data socket if desired */
if (dsp != NULL) {
u_char sbuf[NG_NODESIZ + 1 + NGSA_OVERHEAD];
struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
/* Create data socket, initially just "floating" */
if ((ds = socket(AF_NETGRAPH, SOCK_DGRAM, NG_DATA)) < 0) {
errnosv = errno;
if (_gNgDebugLevel >= 1)
NGLOG("socket");
goto errout;
}
/* Associate the data socket with the node */
snprintf(sg->sg_data, NG_NODESIZ + 1, "%s:", namebuf);
sg->sg_family = AF_NETGRAPH;
sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
if (connect(ds, (struct sockaddr *) sg, sg->sg_len) < 0) {
errnosv = errno;
if (_gNgDebugLevel >= 1)
NGLOG("connect(%s)", sg->sg_data);
goto errout;
}
}
/* Return the socket(s) */
if (csp)
*csp = cs;
else
close(cs);
if (dsp)
*dsp = ds;
return (0);
errout:
/* Failed */
if (cs >= 0)
close(cs);
if (ds >= 0)
close(ds);
errno = errnosv;
return (-1);
}
/*
* Assign a globally unique name to a node
* Returns -1 if error and sets errno.
*/
int
NgNameNode(int cs, const char *path, const char *fmt, ...)
{
struct ngm_name ngn;
va_list args;
/* Build message arg */
va_start(args, fmt);
vsnprintf(ngn.name, sizeof(ngn.name), fmt, args);
va_end(args);
/* Send message */
if (NgSendMsg(cs, path,
NGM_GENERIC_COOKIE, NGM_NAME, &ngn, sizeof(ngn)) < 0) {
if (_gNgDebugLevel >= 1)
NGLOGX("%s: failed", __FUNCTION__);
return (-1);
}
/* Done */
return (0);
}
/*
* Read a packet from a data socket
* Returns -1 if error and sets errno.
*/
int
NgRecvData(int ds, u_char * buf, size_t len, char *hook)
{
u_char frombuf[NG_HOOKSIZ + NGSA_OVERHEAD];
struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf;
int fromlen = sizeof(frombuf);
int rtn, errnosv;
/* Read packet */
rtn = recvfrom(ds, buf, len, 0, (struct sockaddr *) from, &fromlen);
if (rtn < 0) {
errnosv = errno;
if (_gNgDebugLevel >= 1)
NGLOG("recvfrom");
errno = errnosv;
return (-1);
}
/* Copy hook name */
if (hook != NULL)
strlcpy(hook, from->sg_data, NG_HOOKSIZ);
/* Debugging */
if (_gNgDebugLevel >= 2) {
NGLOGX("READ %s from hook \"%s\" (%d bytes)",
rtn ? "PACKET" : "EOF", from->sg_data, rtn);
if (_gNgDebugLevel >= 3)
_NgDebugBytes(buf, rtn);
}
/* Done */
return (rtn);
}
/*
* Identical to NgRecvData() except buffer is dynamically allocated.
*/
int
NgAllocRecvData(int ds, u_char **buf, char *hook)
{
int len;
socklen_t optlen;
optlen = sizeof(len);
if (getsockopt(ds, SOL_SOCKET, SO_RCVBUF, &len, &optlen) == -1 ||
(*buf = malloc(len)) == NULL)
return (-1);
if ((len = NgRecvData(ds, *buf, len, hook)) < 0)
free(*buf);
return (len);
}
/*
* Write a packet to a data socket. The packet will be sent
* out the corresponding node on the specified hook.
* Returns -1 if error and sets errno.
*/
int
NgSendData(int ds, const char *hook, const u_char * buf, size_t len)
{
u_char sgbuf[NG_HOOKSIZ + NGSA_OVERHEAD];
struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
int errnosv;
/* Set up destination hook */
sg->sg_family = AF_NETGRAPH;
strlcpy(sg->sg_data, hook, NG_HOOKSIZ);
sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
/* Debugging */
if (_gNgDebugLevel >= 2) {
NGLOGX("WRITE PACKET to hook \"%s\" (%d bytes)", hook, len);
_NgDebugSockaddr(sg);
if (_gNgDebugLevel >= 3)
_NgDebugBytes(buf, len);
}
/* Send packet */
if (sendto(ds, buf, len, 0, (struct sockaddr *) sg, sg->sg_len) < 0) {
errnosv = errno;
if (_gNgDebugLevel >= 1)
NGLOG("sendto(%s)", sg->sg_data);
errno = errnosv;
return (-1);
}
/* Done */
return (0);
}