sshbuf-misc.c revision 323134 
1/*	$OpenBSD: sshbuf-misc.c,v 1.6 2016/05/02 08:49:03 djm Exp $	*/
2/*
3 * Copyright (c) 2011 Damien Miller
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#include "includes.h"
19
20#include <sys/types.h>
21#include <sys/socket.h>
22#include <netinet/in.h>
23#include <errno.h>
24#include <stdlib.h>
25#ifdef HAVE_STDINT_H
26#include <stdint.h>
27#endif
28#include <stdio.h>
29#include <limits.h>
30#include <string.h>
31#include <resolv.h>
32#include <ctype.h>
33
34#include "ssherr.h"
35#define SSHBUF_INTERNAL
36#include "sshbuf.h"
37
38void
39sshbuf_dump_data(const void *s, size_t len, FILE *f)
40{
41	size_t i, j;
42	const u_char *p = (const u_char *)s;
43
44	for (i = 0; i < len; i += 16) {
45		fprintf(f, "%.4zu: ", i);
46		for (j = i; j < i + 16; j++) {
47			if (j < len)
48				fprintf(f, "%02x ", p[j]);
49			else
50				fprintf(f, "   ");
51		}
52		fprintf(f, " ");
53		for (j = i; j < i + 16; j++) {
54			if (j < len) {
55				if  (isascii(p[j]) && isprint(p[j]))
56					fprintf(f, "%c", p[j]);
57				else
58					fprintf(f, ".");
59			}
60		}
61		fprintf(f, "\n");
62	}
63}
64
65void
66sshbuf_dump(struct sshbuf *buf, FILE *f)
67{
68	fprintf(f, "buffer %p len = %zu\n", buf, sshbuf_len(buf));
69	sshbuf_dump_data(sshbuf_ptr(buf), sshbuf_len(buf), f);
70}
71
72char *
73sshbuf_dtob16(struct sshbuf *buf)
74{
75	size_t i, j, len = sshbuf_len(buf);
76	const u_char *p = sshbuf_ptr(buf);
77	char *ret;
78	const char hex[] = "0123456789abcdef";
79
80	if (len == 0)
81		return strdup("");
82	if (SIZE_MAX / 2 <= len || (ret = malloc(len * 2 + 1)) == NULL)
83		return NULL;
84	for (i = j = 0; i < len; i++) {
85		ret[j++] = hex[(p[i] >> 4) & 0xf];
86		ret[j++] = hex[p[i] & 0xf];
87	}
88	ret[j] = '\0';
89	return ret;
90}
91
92char *
93sshbuf_dtob64(struct sshbuf *buf)
94{
95	size_t len = sshbuf_len(buf), plen;
96	const u_char *p = sshbuf_ptr(buf);
97	char *ret;
98	int r;
99
100	if (len == 0)
101		return strdup("");
102	plen = ((len + 2) / 3) * 4 + 1;
103	if (SIZE_MAX / 2 <= len || (ret = malloc(plen)) == NULL)
104		return NULL;
105	if ((r = b64_ntop(p, len, ret, plen)) == -1) {
106		explicit_bzero(ret, plen);
107		free(ret);
108		return NULL;
109	}
110	return ret;
111}
112
113int
114sshbuf_b64tod(struct sshbuf *buf, const char *b64)
115{
116	size_t plen = strlen(b64);
117	int nlen, r;
118	u_char *p;
119
120	if (plen == 0)
121		return 0;
122	if ((p = malloc(plen)) == NULL)
123		return SSH_ERR_ALLOC_FAIL;
124	if ((nlen = b64_pton(b64, p, plen)) < 0) {
125		explicit_bzero(p, plen);
126		free(p);
127		return SSH_ERR_INVALID_FORMAT;
128	}
129	if ((r = sshbuf_put(buf, p, nlen)) < 0) {
130		explicit_bzero(p, plen);
131		free(p);
132		return r;
133	}
134	explicit_bzero(p, plen);
135	free(p);
136	return 0;
137}
138
139char *
140sshbuf_dup_string(struct sshbuf *buf)
141{
142	const u_char *p = NULL, *s = sshbuf_ptr(buf);
143	size_t l = sshbuf_len(buf);
144	char *r;
145
146	if (s == NULL || l > SIZE_MAX)
147		return NULL;
148	/* accept a nul only as the last character in the buffer */
149	if (l > 0 && (p = memchr(s, '\0', l)) != NULL) {
150		if (p != s + l - 1)
151			return NULL;
152		l--; /* the nul is put back below */
153	}
154	if ((r = malloc(l + 1)) == NULL)
155		return NULL;
156	if (l > 0)
157		memcpy(r, s, l);
158	r[l] = '\0';
159	return r;
160}
161
162