Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame^] | 1 | /* $OpenBSD: msg.c,v 1.15 2006/08/03 03:34:42 deraadt Exp $ */ |
| 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 | |
| 26 | #include "includes.h" |
| 27 | |
| 28 | #include <sys/types.h> |
| 29 | #include <sys/uio.h> |
| 30 | |
| 31 | #include <errno.h> |
| 32 | #include <stdio.h> |
| 33 | #include <string.h> |
| 34 | #include <unistd.h> |
| 35 | #include <stdarg.h> |
| 36 | |
| 37 | #include "buffer.h" |
| 38 | #include "log.h" |
| 39 | #include "atomicio.h" |
| 40 | #include "msg.h" |
| 41 | #include "misc.h" |
| 42 | |
| 43 | int |
| 44 | ssh_msg_send(int fd, u_char type, Buffer *m) |
| 45 | { |
| 46 | u_char buf[5]; |
| 47 | u_int mlen = buffer_len(m); |
| 48 | |
| 49 | debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff); |
| 50 | |
| 51 | put_u32(buf, mlen + 1); |
| 52 | buf[4] = type; /* 1st byte of payload is mesg-type */ |
| 53 | if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) { |
| 54 | error("ssh_msg_send: write"); |
| 55 | return (-1); |
| 56 | } |
| 57 | if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) { |
| 58 | error("ssh_msg_send: write"); |
| 59 | return (-1); |
| 60 | } |
| 61 | return (0); |
| 62 | } |
| 63 | |
| 64 | int |
| 65 | ssh_msg_recv(int fd, Buffer *m) |
| 66 | { |
| 67 | u_char buf[4]; |
| 68 | u_int msg_len; |
| 69 | |
| 70 | debug3("ssh_msg_recv entering"); |
| 71 | |
| 72 | if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) { |
| 73 | if (errno != EPIPE) |
| 74 | error("ssh_msg_recv: read: header"); |
| 75 | return (-1); |
| 76 | } |
| 77 | msg_len = get_u32(buf); |
| 78 | if (msg_len > 256 * 1024) { |
| 79 | error("ssh_msg_recv: read: bad msg_len %u", msg_len); |
| 80 | return (-1); |
| 81 | } |
| 82 | buffer_clear(m); |
| 83 | buffer_append_space(m, msg_len); |
| 84 | if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) { |
| 85 | error("ssh_msg_recv: read: %s", strerror(errno)); |
| 86 | return (-1); |
| 87 | } |
| 88 | return (0); |
| 89 | } |