crypto/openssh/sshbuf-misc.c

   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