398 lines
10 KiB
C
398 lines
10 KiB
C
/*
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* msg.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: msg.c,v 1.9 1999/01/20 00:57:23 archie Exp $
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*/
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#ifdef FSTACK
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#define _GNU_SOURCE
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#include <stdio.h>
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#endif
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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 <sys/socket.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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/* Next message token value */
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static int gMsgId;
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/* For delivering both messages and replies */
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static int NgDeliverMsg(int cs, const char *path,
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const struct ng_mesg *hdr, const void *args, size_t arglen);
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/*
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* Send a message to a node using control socket node "cs".
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* Returns -1 if error and sets errno appropriately.
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* If successful, returns the message ID (token) used.
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*/
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int
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NgSendMsg(int cs, const char *path,
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int cookie, int cmd, const void *args, size_t arglen)
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{
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struct ng_mesg msg;
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/* Prepare message header */
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memset(&msg, 0, sizeof(msg));
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msg.header.version = NG_VERSION;
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msg.header.typecookie = cookie;
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if (++gMsgId < 0)
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gMsgId = 1;
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msg.header.token = gMsgId;
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msg.header.flags = NGF_ORIG;
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msg.header.cmd = cmd;
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snprintf((char *)msg.header.cmdstr, NG_CMDSTRSIZ, "cmd%d", cmd);
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/* Deliver message */
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if (NgDeliverMsg(cs, path, &msg, args, arglen) < 0)
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return (-1);
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return (msg.header.token);
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}
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/*
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* Send a message given in ASCII format. We first ask the node to translate
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* the command into binary, and then we send the binary.
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*/
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int
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NgSendAsciiMsg(int cs, const char *path, const char *fmt, ...)
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{
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struct ng_mesg *reply, *binary, *ascii;
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char *buf, *cmd, *args;
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va_list fmtargs;
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int token;
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/* Parse out command and arguments */
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va_start(fmtargs, fmt);
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vasprintf(&buf, fmt, fmtargs);
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va_end(fmtargs);
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if (buf == NULL)
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return (-1);
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/* Parse out command, arguments */
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for (cmd = buf; isspace(*cmd); cmd++)
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;
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for (args = cmd; *args != '\0' && !isspace(*args); args++)
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;
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if (*args != '\0') {
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while (isspace(*args))
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*args++ = '\0';
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}
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/* Get a bigger buffer to hold inner message header plus arg string */
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if ((ascii = malloc(sizeof(struct ng_mesg)
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+ strlen(args) + 1)) == NULL) {
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free(buf);
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return (-1);
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}
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memset(ascii, 0, sizeof(*ascii));
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/* Build inner header (only need cmdstr, arglen, and data fields) */
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strncpy((char *)ascii->header.cmdstr, cmd,
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sizeof(ascii->header.cmdstr) - 1);
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strcpy(ascii->data, args);
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ascii->header.arglen = strlen(ascii->data) + 1;
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free(buf);
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/* Send node a request to convert ASCII to binary */
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if (NgSendMsg(cs, path, NGM_GENERIC_COOKIE, NGM_ASCII2BINARY,
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(u_char *)ascii, sizeof(*ascii) + ascii->header.arglen) < 0) {
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free(ascii);
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return (-1);
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}
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free(ascii);
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/* Get reply */
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if (NgAllocRecvMsg(cs, &reply, NULL) < 0)
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return (-1);
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/* Now send binary version */
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binary = (struct ng_mesg *)reply->data;
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if (++gMsgId < 0)
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gMsgId = 1;
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binary->header.token = gMsgId;
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binary->header.version = NG_VERSION;
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if (NgDeliverMsg(cs,
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path, binary, binary->data, binary->header.arglen) < 0) {
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free(reply);
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return (-1);
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}
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token = binary->header.token;
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free(reply);
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return (token);
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}
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/*
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* Send a message that is a reply to a previously received message.
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* Returns -1 and sets errno on error, otherwise returns zero.
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*/
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int
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NgSendReplyMsg(int cs, const char *path,
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const struct ng_mesg *msg, const void *args, size_t arglen)
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{
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struct ng_mesg rep;
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/* Prepare message header */
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rep = *msg;
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rep.header.flags = NGF_RESP;
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/* Deliver message */
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return (NgDeliverMsg(cs, path, &rep, args, arglen));
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}
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/*
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* Send a message to a node using control socket node "cs".
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* Returns -1 if error and sets errno appropriately, otherwise zero.
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*/
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static int
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NgDeliverMsg(int cs, const char *path,
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const struct ng_mesg *hdr, const void *args, size_t arglen)
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{
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u_char sgbuf[NG_PATHSIZ + NGSA_OVERHEAD];
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struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
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u_char *buf = NULL;
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struct ng_mesg *msg;
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int errnosv = 0;
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int rtn = 0;
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/* Sanity check */
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if (args == NULL)
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arglen = 0;
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/* Get buffer */
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if ((buf = malloc(sizeof(*msg) + arglen)) == NULL) {
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errnosv = errno;
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if (_gNgDebugLevel >= 1)
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NGLOG("malloc");
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rtn = -1;
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goto done;
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}
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msg = (struct ng_mesg *) buf;
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/* Finalize message */
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*msg = *hdr;
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msg->header.arglen = arglen;
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memcpy(msg->data, args, arglen);
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/* Prepare socket address */
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sg->sg_family = AF_NETGRAPH;
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/* XXX handle overflow */
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strlcpy(sg->sg_data, path, NG_PATHSIZ);
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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("SENDING %s:",
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(msg->header.flags & NGF_RESP) ? "RESPONSE" : "MESSAGE");
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_NgDebugSockaddr(sg);
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_NgDebugMsg(msg, sg->sg_data);
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}
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/* Send it */
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if (sendto(cs, msg, sizeof(*msg) + arglen,
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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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rtn = -1;
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goto done;
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}
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#ifndef FSTACK
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/* Wait for reply if there should be one. */
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if (msg->header.cmd & NGM_HASREPLY && !(msg->header.flags & NGF_RESP)) {
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struct pollfd rfds;
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int n;
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rfds.fd = cs;
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rfds.events = POLLIN;
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rfds.revents = 0;
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n = poll(&rfds, 1, INFTIM);
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if (n == -1) {
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errnosv = errno;
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if (_gNgDebugLevel >= 1)
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NGLOG("poll");
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rtn = -1;
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}
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}
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#endif
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done:
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/* Done */
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free(buf); /* OK if buf is NULL */
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errno = errnosv;
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return (rtn);
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}
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/*
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* Receive a control message.
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*
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* On error, this returns -1 and sets errno.
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* Otherwise, it returns the length of the received reply.
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*/
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int
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NgRecvMsg(int cs, struct ng_mesg *rep, size_t replen, char *path)
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{
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u_char sgbuf[NG_PATHSIZ + NGSA_OVERHEAD];
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struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
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socklen_t sglen = sizeof(sgbuf);
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int len, errnosv;
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/* Read reply */
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len = recvfrom(cs, rep, replen, 0, (struct sockaddr *) sg, &sglen);
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if (len < 0) {
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errnosv = errno;
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if (_gNgDebugLevel >= 1)
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NGLOG("recvfrom");
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goto errout;
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}
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if (path != NULL)
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strlcpy(path, sg->sg_data, NG_PATHSIZ);
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/* Debugging */
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if (_gNgDebugLevel >= 2) {
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NGLOGX("RECEIVED %s:",
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(rep->header.flags & NGF_RESP) ? "RESPONSE" : "MESSAGE");
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_NgDebugSockaddr(sg);
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_NgDebugMsg(rep, sg->sg_data);
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}
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/* Done */
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return (len);
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errout:
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errno = errnosv;
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return (-1);
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}
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/*
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* Identical to NgRecvMsg() except buffer is dynamically allocated.
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*/
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int
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NgAllocRecvMsg(int cs, struct ng_mesg **rep, char *path)
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{
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int len;
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#ifndef FSTACK
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socklen_t optlen;
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optlen = sizeof(len);
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if (getsockopt(cs, SOL_SOCKET, SO_RCVBUF, &len, &optlen) == -1 ||
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#else
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len = NGCTL_DEFAULT_RCVBUF;
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if (
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#endif
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(*rep = malloc(len)) == NULL)
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return (-1);
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if ((len = NgRecvMsg(cs, *rep, len, path)) < 0)
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free(*rep);
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return (len);
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}
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/*
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* Receive a control message and convert the arguments to ASCII
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*/
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int
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NgRecvAsciiMsg(int cs, struct ng_mesg *reply, size_t replen, char *path)
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{
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struct ng_mesg *msg, *ascii;
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int bufSize, errnosv;
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u_char *buf;
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/* Allocate buffer */
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bufSize = 2 * sizeof(*reply) + replen;
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if ((buf = malloc(bufSize)) == NULL)
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return (-1);
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msg = (struct ng_mesg *)buf;
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ascii = (struct ng_mesg *)msg->data;
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/* Get binary message */
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if (NgRecvMsg(cs, msg, bufSize, path) < 0)
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goto fail;
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memcpy(reply, msg, sizeof(*msg));
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/* Ask originating node to convert the arguments to ASCII */
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if (NgSendMsg(cs, path, NGM_GENERIC_COOKIE,
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NGM_BINARY2ASCII, msg, sizeof(*msg) + msg->header.arglen) < 0)
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goto fail;
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if (NgRecvMsg(cs, msg, bufSize, NULL) < 0)
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goto fail;
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/* Copy result to client buffer */
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if (sizeof(*ascii) + ascii->header.arglen > replen) {
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errno = ERANGE;
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fail:
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errnosv = errno;
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free(buf);
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errno = errnosv;
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return (-1);
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}
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strncpy(reply->data, ascii->data, ascii->header.arglen);
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/* Done */
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free(buf);
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return (0);
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}
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/*
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* Identical to NgRecvAsciiMsg() except buffer is dynamically allocated.
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*/
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int
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NgAllocRecvAsciiMsg(int cs, struct ng_mesg **reply, char *path)
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{
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int len;
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#ifndef FSTACK
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socklen_t optlen;
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optlen = sizeof(len);
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if (getsockopt(cs, SOL_SOCKET, SO_RCVBUF, &len, &optlen) == -1 ||
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#else
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len = NGCTL_DEFAULT_RCVBUF;
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if (
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#endif
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(*reply = malloc(len)) == NULL)
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return (-1);
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if ((len = NgRecvAsciiMsg(cs, *reply, len, path)) < 0)
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free(*reply);
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return (len);
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}
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