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Annotation of src/usr.bin/ssh/msg.c, Revision 1.2

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"
1.2     ! deraadt    25: RCSID("$OpenBSD: msg.c,v 1.1 2002/05/23 19:24:30 markus Exp $");
1.1       markus     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);
1.2     ! deraadt    42:        buf[4] = type;          /* 1st byte of payload is mesg-type */
1.1       markus     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: }