1 /* $NetBSD: msg.c,v 1.12 2024/07/08 22:33:44 christos Exp $ */
2 /* $OpenBSD: msg.c,v 1.21 2024/05/17 00:30:24 djm Exp $ */
3
4 /*
5 * Copyright (c) 2002 Markus Friedl. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "includes.h"
29 __RCSID("$NetBSD: msg.c,v 1.12 2024/07/08 22:33:44 christos Exp $");
30 #include <sys/types.h>
31 #include <sys/uio.h>
32
33 #include <errno.h>
34 #include <stdio.h>
35 #include <string.h>
36 #include <unistd.h>
37 #include <stdarg.h>
38 #include <time.h>
39
40 #include "sshbuf.h"
41 #include "ssherr.h"
42 #include "log.h"
43 #include "atomicio.h"
44 #include "msg.h"
45 #include "misc.h"
46
47 int
ssh_msg_send(int fd,u_char type,struct sshbuf * m)48 ssh_msg_send(int fd, u_char type, struct sshbuf *m)
49 {
50 u_char buf[5];
51 u_int mlen = sshbuf_len(m);
52
53 debug3_f("type %u len %zu", (unsigned int)type & 0xff, sshbuf_len(m));
54
55 put_u32(buf, mlen + 1);
56 buf[4] = type; /* 1st byte of payload is mesg-type */
57 if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
58 error_f("write: %s", strerror(errno));
59 return (-1);
60 }
61 if (atomicio(vwrite, fd, sshbuf_mutable_ptr(m), mlen) != mlen) {
62 error_f("write: %s", strerror(errno));
63 return (-1);
64 }
65 debug3_f("done");
66 return (0);
67 }
68
69 int
ssh_msg_recv(int fd,struct sshbuf * m)70 ssh_msg_recv(int fd, struct sshbuf *m)
71 {
72 u_char buf[4], *p;
73 u_int msg_len;
74 int r;
75
76 debug3("ssh_msg_recv entering");
77
78 if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
79 if (errno != EPIPE)
80 error_f("read header: %s", strerror(errno));
81 return (-1);
82 }
83 msg_len = get_u32(buf);
84 if (msg_len > sshbuf_max_size(m)) {
85 error_f("read: bad msg_len %u", msg_len);
86 return (-1);
87 }
88 sshbuf_reset(m);
89 if ((r = sshbuf_reserve(m, msg_len, &p)) != 0) {
90 error_fr(r, "reserve");
91 return -1;
92 }
93 if (atomicio(read, fd, p, msg_len) != msg_len) {
94 error_f("read: %s", strerror(errno));
95 return (-1);
96 }
97 return (0);
98 }
99