162 lines
3.5 KiB
C
162 lines
3.5 KiB
C
/* $OpenBSD: sshbuf-misc.c,v 1.6 2016/05/02 08:49:03 djm Exp $ */
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/*
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* Copyright (c) 2011 Damien Miller
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "includes.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include <stdlib.h>
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#ifdef HAVE_STDINT_H
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#include <stdint.h>
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#endif
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#include <stdio.h>
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#include <limits.h>
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#include <string.h>
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#include <resolv.h>
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#include <ctype.h>
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#include "ssherr.h"
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#define SSHBUF_INTERNAL
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#include "sshbuf.h"
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void
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sshbuf_dump_data(const void *s, size_t len, FILE *f)
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{
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size_t i, j;
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const u_char *p = (const u_char *)s;
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for (i = 0; i < len; i += 16) {
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fprintf(f, "%.4zu: ", i);
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for (j = i; j < i + 16; j++) {
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if (j < len)
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fprintf(f, "%02x ", p[j]);
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else
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fprintf(f, " ");
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}
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fprintf(f, " ");
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for (j = i; j < i + 16; j++) {
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if (j < len) {
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if (isascii(p[j]) && isprint(p[j]))
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fprintf(f, "%c", p[j]);
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else
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fprintf(f, ".");
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}
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}
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fprintf(f, "\n");
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}
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}
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void
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sshbuf_dump(struct sshbuf *buf, FILE *f)
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{
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fprintf(f, "buffer %p len = %zu\n", buf, sshbuf_len(buf));
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sshbuf_dump_data(sshbuf_ptr(buf), sshbuf_len(buf), f);
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}
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char *
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sshbuf_dtob16(struct sshbuf *buf)
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{
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size_t i, j, len = sshbuf_len(buf);
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const u_char *p = sshbuf_ptr(buf);
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char *ret;
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const char hex[] = "0123456789abcdef";
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if (len == 0)
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return strdup("");
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if (SIZE_MAX / 2 <= len || (ret = malloc(len * 2 + 1)) == NULL)
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return NULL;
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for (i = j = 0; i < len; i++) {
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ret[j++] = hex[(p[i] >> 4) & 0xf];
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ret[j++] = hex[p[i] & 0xf];
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}
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ret[j] = '\0';
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return ret;
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}
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char *
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sshbuf_dtob64(struct sshbuf *buf)
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{
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size_t len = sshbuf_len(buf), plen;
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const u_char *p = sshbuf_ptr(buf);
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char *ret;
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int r;
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if (len == 0)
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return strdup("");
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plen = ((len + 2) / 3) * 4 + 1;
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if (SIZE_MAX / 2 <= len || (ret = malloc(plen)) == NULL)
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return NULL;
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if ((r = b64_ntop(p, len, ret, plen)) == -1) {
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explicit_bzero(ret, plen);
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free(ret);
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return NULL;
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}
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return ret;
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}
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int
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sshbuf_b64tod(struct sshbuf *buf, const char *b64)
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{
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size_t plen = strlen(b64);
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int nlen, r;
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u_char *p;
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if (plen == 0)
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return 0;
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if ((p = malloc(plen)) == NULL)
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return SSH_ERR_ALLOC_FAIL;
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if ((nlen = b64_pton(b64, p, plen)) < 0) {
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explicit_bzero(p, plen);
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free(p);
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return SSH_ERR_INVALID_FORMAT;
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}
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if ((r = sshbuf_put(buf, p, nlen)) < 0) {
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explicit_bzero(p, plen);
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free(p);
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return r;
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}
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explicit_bzero(p, plen);
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free(p);
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return 0;
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}
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char *
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sshbuf_dup_string(struct sshbuf *buf)
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{
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const u_char *p = NULL, *s = sshbuf_ptr(buf);
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size_t l = sshbuf_len(buf);
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char *r;
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if (s == NULL || l > SIZE_MAX)
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return NULL;
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/* accept a nul only as the last character in the buffer */
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if (l > 0 && (p = memchr(s, '\0', l)) != NULL) {
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if (p != s + l - 1)
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return NULL;
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l--; /* the nul is put back below */
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}
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if ((r = malloc(l + 1)) == NULL)
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return NULL;
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if (l > 0)
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memcpy(r, s, l);
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r[l] = '\0';
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return r;
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}
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