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Annotation of src/usr.bin/ssh/msg.c, Revision 1.1

1.1     ! markus      1: /*
        !             2:  * Copyright (c) 2002 Markus Friedl.  All rights reserved.
        !             3:  *
        !             4:  * Redistribution and use in source and binary forms, with or without
        !             5:  * modification, are permitted provided that the following conditions
        !             6:  * are met:
        !             7:  * 1. Redistributions of source code must retain the above copyright
        !             8:  *    notice, this list of conditions and the following disclaimer.
        !             9:  * 2. Redistributions in binary form must reproduce the above copyright
        !            10:  *    notice, this list of conditions and the following disclaimer in the
        !            11:  *    documentation and/or other materials provided with the distribution.
        !            12:  *
        !            13:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            15:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            16:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            17:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            18:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            19:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            20:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            21:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            22:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            23:  */
        !            24: #include "includes.h"
        !            25: RCSID("$OpenBSD: $");
        !            26:
        !            27: #include "buffer.h"
        !            28: #include "getput.h"
        !            29: #include "log.h"
        !            30: #include "atomicio.h"
        !            31: #include "msg.h"
        !            32:
        !            33: void
        !            34: msg_send(int fd, u_char type, Buffer *m)
        !            35: {
        !            36:        u_char buf[5];
        !            37:        u_int mlen = buffer_len(m);
        !            38:
        !            39:        debug3("msg_send: type %d", type);
        !            40:
        !            41:        PUT_32BIT(buf, mlen + 1);
        !            42:        buf[4] = type;         /* 1st byte of payload is mesg-type */
        !            43:        if (atomicio(write, fd, buf, sizeof(buf)) != sizeof(buf))
        !            44:                fatal("msg_send: write");
        !            45:        if (atomicio(write, fd, buffer_ptr(m), mlen) != mlen)
        !            46:                fatal("msg_send: write");
        !            47: }
        !            48:
        !            49: int
        !            50: msg_recv(int fd, Buffer *m)
        !            51: {
        !            52:        u_char buf[4];
        !            53:        ssize_t res;
        !            54:        u_int msg_len;
        !            55:
        !            56:        debug3("msg_recv entering");
        !            57:
        !            58:        res = atomicio(read, fd, buf, sizeof(buf));
        !            59:        if (res != sizeof(buf)) {
        !            60:                if (res == 0)
        !            61:                        return -1;
        !            62:                fatal("msg_recv: read: header %d", res);
        !            63:        }
        !            64:        msg_len = GET_32BIT(buf);
        !            65:        if (msg_len > 256 * 1024)
        !            66:                fatal("msg_recv: read: bad msg_len %d", msg_len);
        !            67:        buffer_clear(m);
        !            68:        buffer_append_space(m, msg_len);
        !            69:        res = atomicio(read, fd, buffer_ptr(m), msg_len);
        !            70:        if (res != msg_len)
        !            71:                fatal("msg_recv: read: %ld != msg_len", (long)res);
        !            72:        return 0;
        !            73: }