xref: /openssh-portable/sshbuf-misc.c (revision 8668706d)
1 /*	$OpenBSD: sshbuf-misc.c,v 1.2 2014/06/24 01:13:21 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 #include <stdio.h>
26 #include <limits.h>
27 #include <string.h>
28 #include <resolv.h>
29 #include <ctype.h>
30 
31 #include "ssherr.h"
32 #define SSHBUF_INTERNAL
33 #include "sshbuf.h"
34 
35 void
36 sshbuf_dump_data(const void *s, size_t len, FILE *f)
37 {
38 	size_t i, j;
39 	const u_char *p = (const u_char *)s;
40 
41 	for (i = 0; i < len; i += 16) {
42 		fprintf(f, "%.4zd: ", i);
43 		for (j = i; j < i + 16; j++) {
44 			if (j < len)
45 				fprintf(f, "%02x ", p[j]);
46 			else
47 				fprintf(f, "   ");
48 		}
49 		fprintf(f, " ");
50 		for (j = i; j < i + 16; j++) {
51 			if (j < len) {
52 				if  (isascii(p[j]) && isprint(p[j]))
53 					fprintf(f, "%c", p[j]);
54 				else
55 					fprintf(f, ".");
56 			}
57 		}
58 		fprintf(f, "\n");
59 	}
60 }
61 
62 void
63 sshbuf_dump(struct sshbuf *buf, FILE *f)
64 {
65 	fprintf(f, "buffer %p len = %zu\n", buf, sshbuf_len(buf));
66 	sshbuf_dump_data(sshbuf_ptr(buf), sshbuf_len(buf), f);
67 }
68 
69 char *
70 sshbuf_dtob16(struct sshbuf *buf)
71 {
72 	size_t i, j, len = sshbuf_len(buf);
73 	const u_char *p = sshbuf_ptr(buf);
74 	char *ret;
75 	const char hex[] = "0123456789abcdef";
76 
77 	if (len == 0)
78 		return strdup("");
79 	if (SIZE_MAX / 2 <= len || (ret = malloc(len * 2 + 1)) == NULL)
80 		return NULL;
81 	for (i = j = 0; i < len; i++) {
82 		ret[j++] = hex[(p[i] >> 4) & 0xf];
83 		ret[j++] = hex[p[i] & 0xf];
84 	}
85 	ret[j] = '\0';
86 	return ret;
87 }
88 
89 char *
90 sshbuf_dtob64(struct sshbuf *buf)
91 {
92 	size_t len = sshbuf_len(buf), plen;
93 	const u_char *p = sshbuf_ptr(buf);
94 	char *ret;
95 	int r;
96 
97 	if (len == 0)
98 		return strdup("");
99 	plen = ((len + 2) / 3) * 4 + 1;
100 	if (SIZE_MAX / 2 <= len || (ret = malloc(plen)) == NULL)
101 		return NULL;
102 	if ((r = b64_ntop(p, len, ret, plen)) == -1) {
103 		bzero(ret, plen);
104 		free(ret);
105 		return NULL;
106 	}
107 	return ret;
108 }
109 
110 int
111 sshbuf_b64tod(struct sshbuf *buf, const char *b64)
112 {
113 	size_t plen = strlen(b64);
114 	int nlen, r;
115 	u_char *p;
116 
117 	if (plen == 0)
118 		return 0;
119 	if ((p = malloc(plen)) == NULL)
120 		return SSH_ERR_ALLOC_FAIL;
121 	if ((nlen = b64_pton(b64, p, plen)) < 0) {
122 		bzero(p, plen);
123 		free(p);
124 		return SSH_ERR_INVALID_FORMAT;
125 	}
126 	if ((r = sshbuf_put(buf, p, nlen)) < 0) {
127 		bzero(p, plen);
128 		free(p);
129 		return r;
130 	}
131 	bzero(p, plen);
132 	free(p);
133 	return 0;
134 }
135 
136