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Annotation of src/usr.bin/ssh/msg.c, Revision 1.8.4.1

1.8.4.1 ! brad        1: /* $OpenBSD: msg.c,v 1.15 2006/08/03 03:34:42 deraadt Exp $ */
1.1       markus      2: /*
                      3:  * Copyright (c) 2002 Markus Friedl.  All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  *
                     14:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     15:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     16:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     17:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     18:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     19:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     20:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     21:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     22:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     23:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     24:  */
1.8.4.1 ! brad       25:
        !            26: #include <sys/types.h>
        !            27: #include <sys/uio.h>
        !            28:
        !            29: #include <errno.h>
        !            30: #include <stdio.h>
        !            31: #include <string.h>
        !            32: #include <unistd.h>
        !            33: #include <stdarg.h>
1.1       markus     34:
                     35: #include "buffer.h"
                     36: #include "log.h"
                     37: #include "atomicio.h"
                     38: #include "msg.h"
1.8.4.1 ! brad       39: #include "misc.h"
1.1       markus     40:
1.7       djm        41: int
1.5       djm        42: ssh_msg_send(int fd, u_char type, Buffer *m)
1.1       markus     43: {
                     44:        u_char buf[5];
                     45:        u_int mlen = buffer_len(m);
                     46:
1.5       djm        47:        debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
1.1       markus     48:
1.8.4.1 ! brad       49:        put_u32(buf, mlen + 1);
1.2       deraadt    50:        buf[4] = type;          /* 1st byte of payload is mesg-type */
1.7       djm        51:        if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
                     52:                error("ssh_msg_send: write");
                     53:                return (-1);
                     54:        }
                     55:        if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) {
                     56:                error("ssh_msg_send: write");
                     57:                return (-1);
                     58:        }
                     59:        return (0);
1.1       markus     60: }
                     61:
                     62: int
1.5       djm        63: ssh_msg_recv(int fd, Buffer *m)
1.1       markus     64: {
                     65:        u_char buf[4];
                     66:        u_int msg_len;
                     67:
1.5       djm        68:        debug3("ssh_msg_recv entering");
1.1       markus     69:
1.8       avsm       70:        if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
                     71:                if (errno != EPIPE)
                     72:                        error("ssh_msg_recv: read: header");
1.7       djm        73:                return (-1);
1.1       markus     74:        }
1.8.4.1 ! brad       75:        msg_len = get_u32(buf);
1.7       djm        76:        if (msg_len > 256 * 1024) {
                     77:                error("ssh_msg_recv: read: bad msg_len %u", msg_len);
                     78:                return (-1);
                     79:        }
1.1       markus     80:        buffer_clear(m);
                     81:        buffer_append_space(m, msg_len);
1.8       avsm       82:        if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) {
                     83:                error("ssh_msg_recv: read: %s", strerror(errno));
1.7       djm        84:                return (-1);
                     85:        }
                     86:        return (0);
1.1       markus     87: }