d15ff41778
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
301 lines
8.1 KiB
C
301 lines
8.1 KiB
C
/*
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* sock.c
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*
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* Copyright (c) 1996-1999 Whistle Communications, Inc.
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* All rights reserved.
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*
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* Subject to the following obligations and disclaimer of warranty, use and
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* redistribution of this software, in source or object code forms, with or
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* without modifications are expressly permitted by Whistle Communications;
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* provided, however, that:
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* 1. Any and all reproductions of the source or object code must include the
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* copyright notice above and the following disclaimer of warranties; and
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* 2. No rights are granted, in any manner or form, to use Whistle
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* Communications, Inc. trademarks, including the mark "WHISTLE
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* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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* such appears in the above copyright notice or in the software.
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*
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* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Archie Cobbs <archie@whistle.com>
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*
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* $Whistle: sock.c,v 1.12 1999/01/20 00:57:23 archie Exp $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <stdarg.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/ng_socket.h>
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#include "netgraph.h"
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#include "internal.h"
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/* The socket node type KLD */
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#define NG_SOCKET_KLD "ng_socket.ko"
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/*
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* Create a socket type node and give it the supplied name.
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* Return data and control sockets corresponding to the node.
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* Returns -1 if error and sets errno.
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*/
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int
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NgMkSockNode(const char *name, int *csp, int *dsp)
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{
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char namebuf[NG_NODESIZ];
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int cs = -1; /* control socket */
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int ds = -1; /* data socket */
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int errnosv;
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/* Empty name means no name */
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if (name && *name == 0)
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name = NULL;
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/* Create control socket; this also creates the netgraph node.
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If we get an EPROTONOSUPPORT then the socket node type is
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not loaded, so load it and try again. */
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if ((cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL)) < 0) {
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if (errno == EPROTONOSUPPORT) {
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if (kldload(NG_SOCKET_KLD) < 0) {
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errnosv = errno;
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if (_gNgDebugLevel >= 1)
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NGLOG("can't load %s", NG_SOCKET_KLD);
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goto errout;
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}
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cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL);
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if (cs >= 0)
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goto gotNode;
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}
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errnosv = errno;
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if (_gNgDebugLevel >= 1)
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NGLOG("socket");
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goto errout;
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}
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gotNode:
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/* Assign the node the desired name, if any */
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if (name != NULL) {
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u_char sbuf[NG_NODESIZ + NGSA_OVERHEAD];
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struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
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/* Assign name */
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strlcpy(sg->sg_data, name, NG_NODESIZ);
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sg->sg_family = AF_NETGRAPH;
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sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
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if (bind(cs, (struct sockaddr *) sg, sg->sg_len) < 0) {
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errnosv = errno;
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if (_gNgDebugLevel >= 1)
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NGLOG("bind(%s)", sg->sg_data);
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goto errout;
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}
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/* Save node name */
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strlcpy(namebuf, name, sizeof(namebuf));
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} else if (dsp != NULL) {
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u_char rbuf[sizeof(struct ng_mesg) + sizeof(struct nodeinfo)];
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struct ng_mesg *const resp = (struct ng_mesg *) rbuf;
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struct nodeinfo *const ni = (struct nodeinfo *) resp->data;
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/* Find out the node ID */
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if (NgSendMsg(cs, ".", NGM_GENERIC_COOKIE,
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NGM_NODEINFO, NULL, 0) < 0) {
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errnosv = errno;
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if (_gNgDebugLevel >= 1)
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NGLOG("send nodeinfo");
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goto errout;
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}
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if (NgRecvMsg(cs, resp, sizeof(rbuf), NULL) < 0) {
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errnosv = errno;
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if (_gNgDebugLevel >= 1)
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NGLOG("recv nodeinfo");
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goto errout;
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}
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/* Save node "name" */
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snprintf(namebuf, sizeof(namebuf), "[%lx]", (u_long) ni->id);
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}
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/* Create data socket if desired */
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if (dsp != NULL) {
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u_char sbuf[NG_NODESIZ + 1 + NGSA_OVERHEAD];
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struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
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/* Create data socket, initially just "floating" */
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if ((ds = socket(AF_NETGRAPH, SOCK_DGRAM, NG_DATA)) < 0) {
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errnosv = errno;
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if (_gNgDebugLevel >= 1)
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NGLOG("socket");
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goto errout;
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}
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/* Associate the data socket with the node */
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snprintf(sg->sg_data, NG_NODESIZ + 1, "%s:", namebuf);
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sg->sg_family = AF_NETGRAPH;
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sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
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if (connect(ds, (struct sockaddr *) sg, sg->sg_len) < 0) {
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errnosv = errno;
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if (_gNgDebugLevel >= 1)
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NGLOG("connect(%s)", sg->sg_data);
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goto errout;
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}
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}
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/* Return the socket(s) */
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if (csp)
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*csp = cs;
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else
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close(cs);
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if (dsp)
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*dsp = ds;
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return (0);
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errout:
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/* Failed */
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if (cs >= 0)
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close(cs);
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if (ds >= 0)
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close(ds);
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errno = errnosv;
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return (-1);
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}
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/*
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* Assign a globally unique name to a node
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* Returns -1 if error and sets errno.
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*/
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int
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NgNameNode(int cs, const char *path, const char *fmt, ...)
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{
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struct ngm_name ngn;
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va_list args;
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/* Build message arg */
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va_start(args, fmt);
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vsnprintf(ngn.name, sizeof(ngn.name), fmt, args);
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va_end(args);
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/* Send message */
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if (NgSendMsg(cs, path,
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NGM_GENERIC_COOKIE, NGM_NAME, &ngn, sizeof(ngn)) < 0) {
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if (_gNgDebugLevel >= 1)
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NGLOGX("%s: failed", __FUNCTION__);
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return (-1);
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}
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/* Done */
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return (0);
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}
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/*
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* Read a packet from a data socket
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* Returns -1 if error and sets errno.
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*/
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int
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NgRecvData(int ds, u_char * buf, size_t len, char *hook)
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{
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u_char frombuf[NG_HOOKSIZ + NGSA_OVERHEAD];
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struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf;
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int fromlen = sizeof(frombuf);
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int rtn, errnosv;
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/* Read packet */
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rtn = recvfrom(ds, buf, len, 0, (struct sockaddr *) from, &fromlen);
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if (rtn < 0) {
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errnosv = errno;
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if (_gNgDebugLevel >= 1)
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NGLOG("recvfrom");
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errno = errnosv;
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return (-1);
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}
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/* Copy hook name */
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if (hook != NULL)
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strlcpy(hook, from->sg_data, NG_HOOKSIZ);
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/* Debugging */
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if (_gNgDebugLevel >= 2) {
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NGLOGX("READ %s from hook \"%s\" (%d bytes)",
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rtn ? "PACKET" : "EOF", from->sg_data, rtn);
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if (_gNgDebugLevel >= 3)
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_NgDebugBytes(buf, rtn);
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}
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/* Done */
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return (rtn);
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}
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/*
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* Identical to NgRecvData() except buffer is dynamically allocated.
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*/
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int
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NgAllocRecvData(int ds, u_char **buf, char *hook)
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{
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int len;
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socklen_t optlen;
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optlen = sizeof(len);
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if (getsockopt(ds, SOL_SOCKET, SO_RCVBUF, &len, &optlen) == -1 ||
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(*buf = malloc(len)) == NULL)
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return (-1);
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if ((len = NgRecvData(ds, *buf, len, hook)) < 0)
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free(*buf);
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return (len);
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}
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/*
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* Write a packet to a data socket. The packet will be sent
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* out the corresponding node on the specified hook.
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* Returns -1 if error and sets errno.
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*/
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int
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NgSendData(int ds, const char *hook, const u_char * buf, size_t len)
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{
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u_char sgbuf[NG_HOOKSIZ + NGSA_OVERHEAD];
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struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
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int errnosv;
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/* Set up destination hook */
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sg->sg_family = AF_NETGRAPH;
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strlcpy(sg->sg_data, hook, NG_HOOKSIZ);
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sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
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/* Debugging */
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if (_gNgDebugLevel >= 2) {
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NGLOGX("WRITE PACKET to hook \"%s\" (%d bytes)", hook, len);
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_NgDebugSockaddr(sg);
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if (_gNgDebugLevel >= 3)
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_NgDebugBytes(buf, len);
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}
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/* Send packet */
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if (sendto(ds, buf, len, 0, (struct sockaddr *) sg, sg->sg_len) < 0) {
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errnosv = errno;
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if (_gNgDebugLevel >= 1)
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NGLOG("sendto(%s)", sg->sg_data);
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errno = errnosv;
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return (-1);
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}
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/* Done */
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return (0);
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}
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