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Annotation of src/usr.bin/ssh/msg.c, Revision 1.7.4.1

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"
1.7.4.1 ! brad       25: RCSID("$OpenBSD: msg.c,v 1.8 2005/05/24 17:32:43 avsm 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:
1.7       djm        33: int
1.5       djm        34: ssh_msg_send(int fd, u_char type, Buffer *m)
1.1       markus     35: {
                     36:        u_char buf[5];
                     37:        u_int mlen = buffer_len(m);
                     38:
1.5       djm        39:        debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
1.1       markus     40:
                     41:        PUT_32BIT(buf, mlen + 1);
1.2       deraadt    42:        buf[4] = type;          /* 1st byte of payload is mesg-type */
1.7       djm        43:        if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
                     44:                error("ssh_msg_send: write");
                     45:                return (-1);
                     46:        }
                     47:        if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) {
                     48:                error("ssh_msg_send: write");
                     49:                return (-1);
                     50:        }
                     51:        return (0);
1.1       markus     52: }
                     53:
                     54: int
1.5       djm        55: ssh_msg_recv(int fd, Buffer *m)
1.1       markus     56: {
                     57:        u_char buf[4];
                     58:        u_int msg_len;
                     59:
1.5       djm        60:        debug3("ssh_msg_recv entering");
1.1       markus     61:
1.7.4.1 ! brad       62:        if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
        !            63:                if (errno != EPIPE)
        !            64:                        error("ssh_msg_recv: read: header");
1.7       djm        65:                return (-1);
1.1       markus     66:        }
                     67:        msg_len = GET_32BIT(buf);
1.7       djm        68:        if (msg_len > 256 * 1024) {
                     69:                error("ssh_msg_recv: read: bad msg_len %u", msg_len);
                     70:                return (-1);
                     71:        }
1.1       markus     72:        buffer_clear(m);
                     73:        buffer_append_space(m, msg_len);
1.7.4.1 ! brad       74:        if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) {
        !            75:                error("ssh_msg_recv: read: %s", strerror(errno));
1.7       djm        76:                return (-1);
                     77:        }
                     78:        return (0);
1.1       markus     79: }