74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
/*
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* Copyright (c) 2002 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 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 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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RCSID("$OpenBSD: msg.c,v 1.3 2002/06/24 15:49:22 itojun Exp $");
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#include "buffer.h"
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#include "getput.h"
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#include "log.h"
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#include "atomicio.h"
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#include "msg.h"
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void
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msg_send(int fd, u_char type, Buffer *m)
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{
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u_char buf[5];
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u_int mlen = buffer_len(m);
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debug3("msg_send: type %u", (unsigned int)type & 0xff);
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PUT_32BIT(buf, mlen + 1);
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buf[4] = type; /* 1st byte of payload is mesg-type */
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if (atomicio(write, fd, buf, sizeof(buf)) != sizeof(buf))
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fatal("msg_send: write");
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if (atomicio(write, fd, buffer_ptr(m), mlen) != mlen)
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fatal("msg_send: write");
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}
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int
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msg_recv(int fd, Buffer *m)
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{
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u_char buf[4];
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ssize_t res;
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u_int msg_len;
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debug3("msg_recv entering");
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res = atomicio(read, fd, buf, sizeof(buf));
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if (res != sizeof(buf)) {
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if (res == 0)
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return -1;
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fatal("msg_recv: read: header %ld", (long)res);
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}
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msg_len = GET_32BIT(buf);
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if (msg_len > 256 * 1024)
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fatal("msg_recv: read: bad msg_len %d", msg_len);
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buffer_clear(m);
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buffer_append_space(m, msg_len);
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res = atomicio(read, fd, buffer_ptr(m), msg_len);
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if (res != msg_len)
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fatal("msg_recv: read: %ld != msg_len", (long)res);
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return 0;
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}
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