Annotation of src/usr.bin/ssh/msg.c, Revision 1.19
1.19 ! markus 1: /* $OpenBSD: msg.c,v 1.18 2020/01/22 04:49:16 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: */
1.12 stevesk 25:
1.13 stevesk 26: #include <sys/types.h>
1.15 deraadt 27: #include <sys/uio.h>
1.13 stevesk 28:
1.12 stevesk 29: #include <errno.h>
1.15 deraadt 30: #include <stdio.h>
1.14 stevesk 31: #include <string.h>
1.13 stevesk 32: #include <unistd.h>
1.15 deraadt 33: #include <stdarg.h>
1.1 markus 34:
1.16 djm 35: #include "sshbuf.h"
36: #include "ssherr.h"
1.1 markus 37: #include "log.h"
38: #include "atomicio.h"
39: #include "msg.h"
1.11 djm 40: #include "misc.h"
1.1 markus 41:
1.7 djm 42: int
1.16 djm 43: ssh_msg_send(int fd, u_char type, struct sshbuf *m)
1.1 markus 44: {
45: u_char buf[5];
1.16 djm 46: u_int mlen = sshbuf_len(m);
1.1 markus 47:
1.18 djm 48: debug3("%s: type %u", __func__, (unsigned int)type & 0xff);
1.1 markus 49:
1.11 djm 50: put_u32(buf, mlen + 1);
1.2 deraadt 51: buf[4] = type; /* 1st byte of payload is mesg-type */
1.7 djm 52: if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
1.18 djm 53: error("%s: write: %s", __func__, strerror(errno));
1.7 djm 54: return (-1);
55: }
1.17 markus 56: if (atomicio(vwrite, fd, sshbuf_mutable_ptr(m), mlen) != mlen) {
1.18 djm 57: error("%s: write: %s", __func__, strerror(errno));
1.7 djm 58: return (-1);
59: }
60: return (0);
1.1 markus 61: }
62:
63: int
1.16 djm 64: ssh_msg_recv(int fd, struct sshbuf *m)
1.1 markus 65: {
1.16 djm 66: u_char buf[4], *p;
1.1 markus 67: u_int msg_len;
1.16 djm 68: int r;
1.1 markus 69:
1.5 djm 70: debug3("ssh_msg_recv entering");
1.1 markus 71:
1.8 avsm 72: if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
73: if (errno != EPIPE)
1.18 djm 74: error("%s: read header: %s", __func__, strerror(errno));
1.7 djm 75: return (-1);
1.1 markus 76: }
1.11 djm 77: msg_len = get_u32(buf);
1.19 ! markus 78: if (msg_len > sshbuf_max_size(m)) {
1.18 djm 79: error("%s: read: bad msg_len %u", __func__, msg_len);
1.7 djm 80: return (-1);
81: }
1.16 djm 82: sshbuf_reset(m);
83: if ((r = sshbuf_reserve(m, msg_len, &p)) != 0) {
84: error("%s: buffer error: %s", __func__, ssh_err(r));
85: return -1;
86: }
87: if (atomicio(read, fd, p, msg_len) != msg_len) {
1.18 djm 88: error("%s: read: %s", __func__, strerror(errno));
1.7 djm 89: return (-1);
90: }
91: return (0);
1.1 markus 92: }