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Annotation of src/usr.bin/ssh/msg.c, Revision 1.12

1.12    ! stevesk     1: /* $OpenBSD: msg.c,v 1.11 2006/03/30 09:58:15 djm 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:  */
                     25: #include "includes.h"
1.12    ! stevesk    26:
        !            27: #include <errno.h>
1.1       markus     28:
                     29: #include "buffer.h"
                     30: #include "log.h"
                     31: #include "atomicio.h"
                     32: #include "msg.h"
1.11      djm        33: #include "misc.h"
1.1       markus     34:
1.7       djm        35: int
1.5       djm        36: ssh_msg_send(int fd, u_char type, Buffer *m)
1.1       markus     37: {
                     38:        u_char buf[5];
                     39:        u_int mlen = buffer_len(m);
                     40:
1.5       djm        41:        debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
1.1       markus     42:
1.11      djm        43:        put_u32(buf, mlen + 1);
1.2       deraadt    44:        buf[4] = type;          /* 1st byte of payload is mesg-type */
1.7       djm        45:        if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
                     46:                error("ssh_msg_send: write");
                     47:                return (-1);
                     48:        }
                     49:        if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) {
                     50:                error("ssh_msg_send: write");
                     51:                return (-1);
                     52:        }
                     53:        return (0);
1.1       markus     54: }
                     55:
                     56: int
1.5       djm        57: ssh_msg_recv(int fd, Buffer *m)
1.1       markus     58: {
                     59:        u_char buf[4];
                     60:        u_int msg_len;
                     61:
1.5       djm        62:        debug3("ssh_msg_recv entering");
1.1       markus     63:
1.8       avsm       64:        if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
                     65:                if (errno != EPIPE)
                     66:                        error("ssh_msg_recv: read: header");
1.7       djm        67:                return (-1);
1.1       markus     68:        }
1.11      djm        69:        msg_len = get_u32(buf);
1.7       djm        70:        if (msg_len > 256 * 1024) {
                     71:                error("ssh_msg_recv: read: bad msg_len %u", msg_len);
                     72:                return (-1);
                     73:        }
1.1       markus     74:        buffer_clear(m);
                     75:        buffer_append_space(m, msg_len);
1.8       avsm       76:        if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) {
                     77:                error("ssh_msg_recv: read: %s", strerror(errno));
1.7       djm        78:                return (-1);
                     79:        }
                     80:        return (0);
1.1       markus     81: }