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Annotation of src/usr.bin/ssh/msg.c, Revision 1.14

1.14    ! stevesk     1: /* $OpenBSD: msg.c,v 1.13 2006/07/17 01:31:09 stevesk 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:
1.13      stevesk    27: #include <sys/types.h>
                     28:
1.12      stevesk    29: #include <errno.h>
1.14    ! stevesk    30: #include <string.h>
1.13      stevesk    31: #include <unistd.h>
1.1       markus     32:
                     33: #include "buffer.h"
                     34: #include "log.h"
                     35: #include "atomicio.h"
                     36: #include "msg.h"
1.11      djm        37: #include "misc.h"
1.1       markus     38:
1.7       djm        39: int
1.5       djm        40: ssh_msg_send(int fd, u_char type, Buffer *m)
1.1       markus     41: {
                     42:        u_char buf[5];
                     43:        u_int mlen = buffer_len(m);
                     44:
1.5       djm        45:        debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
1.1       markus     46:
1.11      djm        47:        put_u32(buf, mlen + 1);
1.2       deraadt    48:        buf[4] = type;          /* 1st byte of payload is mesg-type */
1.7       djm        49:        if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
                     50:                error("ssh_msg_send: write");
                     51:                return (-1);
                     52:        }
                     53:        if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) {
                     54:                error("ssh_msg_send: write");
                     55:                return (-1);
                     56:        }
                     57:        return (0);
1.1       markus     58: }
                     59:
                     60: int
1.5       djm        61: ssh_msg_recv(int fd, Buffer *m)
1.1       markus     62: {
                     63:        u_char buf[4];
                     64:        u_int msg_len;
                     65:
1.5       djm        66:        debug3("ssh_msg_recv entering");
1.1       markus     67:
1.8       avsm       68:        if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
                     69:                if (errno != EPIPE)
                     70:                        error("ssh_msg_recv: read: header");
1.7       djm        71:                return (-1);
1.1       markus     72:        }
1.11      djm        73:        msg_len = get_u32(buf);
1.7       djm        74:        if (msg_len > 256 * 1024) {
                     75:                error("ssh_msg_recv: read: bad msg_len %u", msg_len);
                     76:                return (-1);
                     77:        }
1.1       markus     78:        buffer_clear(m);
                     79:        buffer_append_space(m, msg_len);
1.8       avsm       80:        if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) {
                     81:                error("ssh_msg_recv: read: %s", strerror(errno));
1.7       djm        82:                return (-1);
                     83:        }
                     84:        return (0);
1.1       markus     85: }