/src/openssh/sshbuf-misc.c

Source (jump to first uncovered line)
/*  $OpenBSD: sshbuf-misc.c,v 1.20 2025/06/16 09:02:19 dtucker Exp $  */
/*
 * Copyright (c) 2011 Damien Miller
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "includes.h"

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <stdlib.h>
#ifdef HAVE_STDINT_H
# include <stdint.h>
#endif
#include <stdio.h>
#include <limits.h>
#include <string.h>
#include <resolv.h>
#include <ctype.h>
#include <unistd.h>

#include "ssherr.h"
#define SSHBUF_INTERNAL
#include "sshbuf.h"

void
sshbuf_dump_data(const void *s, size_t len, FILE *f)
{
  size_t i, j;
  const u_char *p = (const u_char *)s;

  for (i = 0; i < len; i += 16) {
    fprintf(f, "%.4zu: ", i);
    for (j = i; j < i + 16; j++) {
      if (j < len)
        fprintf(f, "%02x ", p[j]);
      else
        fprintf(f, "   ");
    }
    fprintf(f, " ");
    for (j = i; j < i + 16; j++) {
      if (j < len) {
        if  (isascii(p[j]) && isprint(p[j]))
          fprintf(f, "%c", p[j]);
        else
          fprintf(f, ".");
      }
    }
    fprintf(f, "\n");
  }
}

void
sshbuf_dump(const struct sshbuf *buf, FILE *f)
{
  fprintf(f, "buffer len = %zu\n", sshbuf_len(buf));
  sshbuf_dump_data(sshbuf_ptr(buf), sshbuf_len(buf), f);
}

char *
sshbuf_dtob16(const struct sshbuf *buf)
{
  size_t i, j, len = sshbuf_len(buf);
  const u_char *p = sshbuf_ptr(buf);
  char *ret;
  const char hex[] = "0123456789abcdef";

  if (len == 0)
    return strdup("");
  if (SIZE_MAX / 2 <= len || (ret = malloc(len * 2 + 1)) == NULL)
    return NULL;
  for (i = j = 0; i < len; i++) {
    ret[j++] = hex[(p[i] >> 4) & 0xf];
    ret[j++] = hex[p[i] & 0xf];
  }
  ret[j] = '\0';
  return ret;
}

static int
b16tod(const char v)
{
  if (v >= '0' && v <= '9')
    return v - '0';
  if (v >= 'a' && v <= 'f')
    return 10 + v - 'a';
  if (v >= 'A' && v <= 'A')
    return 10 + v - 'A';
  return -1;
}

struct sshbuf *
sshbuf_b16tod(const char *b16)
{
  struct sshbuf *ret;
  size_t o;
  int r, v1, v2;

  if ((ret = sshbuf_new()) == NULL)
    return NULL;
  for (o = 0; b16[o] != '\0'; o += 2) {
    if ((v1 = b16tod(b16[o])) == -1 ||
        (v2 = b16tod(b16[o + 1])) == -1) {
      sshbuf_free(ret);
      return NULL;
    }
    if ((r = sshbuf_put_u8(ret, (u_char)((v1 << 4) | v2))) != 0) {
      sshbuf_free(ret);
      return NULL;
    }
  }
  /* success */
  return ret;
}

int
sshbuf_dtob64(const struct sshbuf *d, struct sshbuf *b64, int wrap)
{
  size_t i, slen = 0;
  char *s = NULL;
  int r;

  if (d == NULL || b64 == NULL || sshbuf_len(d) >= SIZE_MAX / 2)
    return SSH_ERR_INVALID_ARGUMENT;
  if (sshbuf_len(d) == 0)
    return 0;
  slen = ((sshbuf_len(d) + 2) / 3) * 4 + 1;
  if ((s = malloc(slen)) == NULL)
    return SSH_ERR_ALLOC_FAIL;
  if (b64_ntop(sshbuf_ptr(d), sshbuf_len(d), s, slen) == -1) {
    r = SSH_ERR_INTERNAL_ERROR;
    goto fail;
  }
  if (wrap) {
    for (i = 0; s[i] != '\0'; i++) {
      if ((r = sshbuf_put_u8(b64, s[i])) != 0)
        goto fail;
      if (i % 70 == 69 && (r = sshbuf_put_u8(b64, '\n')) != 0)
        goto fail;
    }
    if ((i - 1) % 70 != 69 && (r = sshbuf_put_u8(b64, '\n')) != 0)
      goto fail;
  } else {
    if ((r = sshbuf_put(b64, s, strlen(s))) != 0)
      goto fail;
  }
  /* Success */
  r = 0;
 fail:
  freezero(s, slen);
  return r;
}

char *
sshbuf_dtob64_string(const struct sshbuf *buf, int wrap)
{
  struct sshbuf *tmp;
  char *ret;

  if ((tmp = sshbuf_new()) == NULL)
    return NULL;
  if (sshbuf_dtob64(buf, tmp, wrap) != 0) {
    sshbuf_free(tmp);
    return NULL;
  }
  ret = sshbuf_dup_string(tmp);
  sshbuf_free(tmp);
  return ret;
}

int
sshbuf_b64tod(struct sshbuf *buf, const char *b64)
{
  size_t plen = strlen(b64);
  int nlen, r;
  u_char *p;

  if (plen == 0)
    return 0;
  if ((p = malloc(plen)) == NULL)
    return SSH_ERR_ALLOC_FAIL;
  if ((nlen = b64_pton(b64, p, plen)) < 0) {
    freezero(p, plen);
    return SSH_ERR_INVALID_FORMAT;
  }
  if ((r = sshbuf_put(buf, p, nlen)) < 0) {
    freezero(p, plen);
    return r;
  }
  freezero(p, plen);
  return 0;
}

int
sshbuf_dtourlb64(const struct sshbuf *d, struct sshbuf *b64, int wrap)
{
  int r = SSH_ERR_INTERNAL_ERROR;
  u_char *p;
  struct sshbuf *b = NULL;
  size_t i, l;

  if ((b = sshbuf_new()) == NULL)
    return SSH_ERR_ALLOC_FAIL;
  /* Encode using regular base64; we'll transform it once done */
  if ((r = sshbuf_dtob64(d, b, wrap)) != 0)
    goto out;
  /* remove padding from end of encoded string*/
  for (;;) {
    l = sshbuf_len(b);
    if (l <= 1 || sshbuf_ptr(b) == NULL) {
      r = SSH_ERR_INTERNAL_ERROR;
      goto out;
    }
    if (sshbuf_ptr(b)[l - 1] != '=')
      break;
    if ((r = sshbuf_consume_end(b, 1)) != 0)
      goto out;
  }
  /* Replace characters with rfc4648 equivalents */
  l = sshbuf_len(b);
  if ((p = sshbuf_mutable_ptr(b)) == NULL) {
    r = SSH_ERR_INTERNAL_ERROR;
    goto out;
  }
  for (i = 0; i < l; i++) {
    if (p[i] == '+')
      p[i] = '-';
    else if (p[i] == '/')
      p[i] = '_';
  }
  r = sshbuf_putb(b64, b);
 out:
  sshbuf_free(b);
  return r;
}

char *
sshbuf_dup_string(struct sshbuf *buf)
{
  const u_char *p = NULL, *s = sshbuf_ptr(buf);
  size_t l = sshbuf_len(buf);
  char *r;

  if (s == NULL || l >= SIZE_MAX)
    return NULL;
  /* accept a nul only as the last character in the buffer */
  if (l > 0 && (p = memchr(s, '\0', l)) != NULL) {
    if (p != s + l - 1)
      return NULL;
    l--; /* the nul is put back below */
  }
  if ((r = malloc(l + 1)) == NULL)
    return NULL;
  if (l > 0)
    memcpy(r, s, l);
  r[l] = '\0';
  return r;
}

int
sshbuf_cmp(const struct sshbuf *b, size_t offset,
    const void *s, size_t len)
{
  if (sshbuf_ptr(b) == NULL)
    return SSH_ERR_INTERNAL_ERROR;
  if (offset > SSHBUF_SIZE_MAX || len > SSHBUF_SIZE_MAX || len == 0)
    return SSH_ERR_INVALID_ARGUMENT;
  if (offset + len > sshbuf_len(b))
    return SSH_ERR_MESSAGE_INCOMPLETE;
  if (timingsafe_bcmp(sshbuf_ptr(b) + offset, s, len) != 0)
    return SSH_ERR_INVALID_FORMAT;
  return 0;
}

int
sshbuf_find(const struct sshbuf *b, size_t start_offset,
    const void *s, size_t len, size_t *offsetp)
{
  void *p;

  if (offsetp != NULL)
    *offsetp = 0;
  if (sshbuf_ptr(b) == NULL)
    return SSH_ERR_INTERNAL_ERROR;
  if (start_offset > SSHBUF_SIZE_MAX || len > SSHBUF_SIZE_MAX || len == 0)
    return SSH_ERR_INVALID_ARGUMENT;
  if (start_offset > sshbuf_len(b) || start_offset + len > sshbuf_len(b))
    return SSH_ERR_MESSAGE_INCOMPLETE;
  if ((p = memmem(sshbuf_ptr(b) + start_offset,
      sshbuf_len(b) - start_offset, s, len)) == NULL)
    return SSH_ERR_INVALID_FORMAT;
  if (offsetp != NULL)
    *offsetp = (const u_char *)p - sshbuf_ptr(b);
  return 0;
}

int
sshbuf_read(int fd, struct sshbuf *buf, size_t maxlen, size_t *rlen)
{
  int r, oerrno;
  size_t adjust;
  ssize_t rr;
  u_char *d;

  if (rlen != NULL)
    *rlen = 0;
  if ((r = sshbuf_reserve(buf, maxlen, &d)) != 0)
    return r;
  rr = read(fd, d, maxlen);
  oerrno = errno;

  /* Adjust the buffer to include only what was actually read */
  if ((adjust = maxlen - (rr > 0 ? rr : 0)) != 0) {
    if ((r = sshbuf_consume_end(buf, adjust)) != 0) {
      /* avoid returning uninitialised data to caller */
      memset(d + rr, '\0', adjust);
      return SSH_ERR_INTERNAL_ERROR; /* shouldn't happen */
    }
  }
  if (rr < 0) {
    errno = oerrno;
    return SSH_ERR_SYSTEM_ERROR;
  } else if (rr == 0) {
    errno = EPIPE;
    return SSH_ERR_SYSTEM_ERROR;
  }
  /* success */
  if (rlen != NULL)
    *rlen = (size_t)rr;
  return 0;
}

Coverage Report

Created: 2025-07-01 07:00

Line	Count	Source (jump to first uncovered line)
1		/* $OpenBSD: sshbuf-misc.c,v 1.20 2025/06/16 09:02:19 dtucker 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		#include <unistd.h>
34
35		#include "ssherr.h"
36		#define SSHBUF_INTERNAL
37		#include "sshbuf.h"
38
39		void
40		sshbuf_dump_data(const void s, size_t len, FILE f)
41	0	{
42	0	size_t i, j;
43	0	const u_char p = (const u_char )s;
44
45	0	for (i = 0; i < len; i += 16) {
46	0	fprintf(f, "%.4zu: ", i);
47	0	for (j = i; j < i + 16; j++) {
48	0	if (j < len)
49	0	fprintf(f, "%02x ", p[j]);
50	0	else
51	0	fprintf(f, " ");
52	0	}
53	0	fprintf(f, " ");
54	0	for (j = i; j < i + 16; j++) {
55	0	if (j < len) {
56	0	if (isascii(p[j]) && isprint(p[j]))
57	0	fprintf(f, "%c", p[j]);
58	0	else
59	0	fprintf(f, ".");
60	0	}
61	0	}
62	0	fprintf(f, "\n");
63	0	}
64	0	}
65
66		void
67		sshbuf_dump(const struct sshbuf buf, FILE f)
68	0	{
69	0	fprintf(f, "buffer len = %zu\n", sshbuf_len(buf));
70	0	sshbuf_dump_data(sshbuf_ptr(buf), sshbuf_len(buf), f);
71	0	}
72
73		char *
74		sshbuf_dtob16(const struct sshbuf *buf)
75	0	{
76	0	size_t i, j, len = sshbuf_len(buf);
77	0	const u_char *p = sshbuf_ptr(buf);
78	0	char *ret;
79	0	const char hex[] = "0123456789abcdef";
80
81	0	if (len == 0)
82	0	return strdup("");
83	0	if (SIZE_MAX / 2 <= len \|\| (ret = malloc(len * 2 + 1)) == NULL)
84	0	return NULL;
85	0	for (i = j = 0; i < len; i++) {
86	0	ret[j++] = hex[(p[i] >> 4) & 0xf];
87	0	ret[j++] = hex[p[i] & 0xf];
88	0	}
89	0	ret[j] = '\0';
90	0	return ret;
91	0	}
92
93		static int
94		b16tod(const char v)
95	0	{
96	0	if (v >= '0' && v <= '9')
97	0	return v - '0';
98	0	if (v >= 'a' && v <= 'f')
99	0	return 10 + v - 'a';
100	0	if (v >= 'A' && v <= 'A')
101	0	return 10 + v - 'A';
102	0	return -1;
103	0	}
104
105		struct sshbuf *
106		sshbuf_b16tod(const char *b16)
107	0	{
108	0	struct sshbuf *ret;
109	0	size_t o;
110	0	int r, v1, v2;
111
112	0	if ((ret = sshbuf_new()) == NULL)
113	0	return NULL;
114	0	for (o = 0; b16[o] != '\0'; o += 2) {
115	0	if ((v1 = b16tod(b16[o])) == -1 \|\|
116	0	(v2 = b16tod(b16[o + 1])) == -1) {
117	0	sshbuf_free(ret);
118	0	return NULL;
119	0	}
120	0	if ((r = sshbuf_put_u8(ret, (u_char)((v1 << 4) \| v2))) != 0) {
121	0	sshbuf_free(ret);
122	0	return NULL;
123	0	}
124	0	}
125		/* success */
126	0	return ret;
127	0	}
128
129		int
130		sshbuf_dtob64(const struct sshbuf d, struct sshbuf b64, int wrap)
131	0	{
132	0	size_t i, slen = 0;
133	0	char *s = NULL;
134	0	int r;
135
136	0	if (d == NULL \|\| b64 == NULL \|\| sshbuf_len(d) >= SIZE_MAX / 2)
137	0	return SSH_ERR_INVALID_ARGUMENT;
138	0	if (sshbuf_len(d) == 0)
139	0	return 0;
140	0	slen = ((sshbuf_len(d) + 2) / 3) * 4 + 1;
141	0	if ((s = malloc(slen)) == NULL)
142	0	return SSH_ERR_ALLOC_FAIL;
143	0	if (b64_ntop(sshbuf_ptr(d), sshbuf_len(d), s, slen) == -1) {
144	0	r = SSH_ERR_INTERNAL_ERROR;
145	0	goto fail;
146	0	}
147	0	if (wrap) {
148	0	for (i = 0; s[i] != '\0'; i++) {
149	0	if ((r = sshbuf_put_u8(b64, s[i])) != 0)
150	0	goto fail;
151	0	if (i % 70 == 69 && (r = sshbuf_put_u8(b64, '\n')) != 0)
152	0	goto fail;
153	0	}
154	0	if ((i - 1) % 70 != 69 && (r = sshbuf_put_u8(b64, '\n')) != 0)
155	0	goto fail;
156	0	} else {
157	0	if ((r = sshbuf_put(b64, s, strlen(s))) != 0)
158	0	goto fail;
159	0	}
160		/* Success */
161	0	r = 0;
162	0	fail:
163	0	freezero(s, slen);
164	0	return r;
165	0	}
166
167		char *
168		sshbuf_dtob64_string(const struct sshbuf *buf, int wrap)
169	0	{
170	0	struct sshbuf *tmp;
171	0	char *ret;
172
173	0	if ((tmp = sshbuf_new()) == NULL)
174	0	return NULL;
175	0	if (sshbuf_dtob64(buf, tmp, wrap) != 0) {
176	0	sshbuf_free(tmp);
177	0	return NULL;
178	0	}
179	0	ret = sshbuf_dup_string(tmp);
180	0	sshbuf_free(tmp);
181	0	return ret;
182	0	}
183
184		int
185		sshbuf_b64tod(struct sshbuf buf, const char b64)
186	0	{
187	0	size_t plen = strlen(b64);
188	0	int nlen, r;
189	0	u_char *p;
190
191	0	if (plen == 0)
192	0	return 0;
193	0	if ((p = malloc(plen)) == NULL)
194	0	return SSH_ERR_ALLOC_FAIL;
195	0	if ((nlen = b64_pton(b64, p, plen)) < 0) {
196	0	freezero(p, plen);
197	0	return SSH_ERR_INVALID_FORMAT;
198	0	}
199	0	if ((r = sshbuf_put(buf, p, nlen)) < 0) {
200	0	freezero(p, plen);
201	0	return r;
202	0	}
203	0	freezero(p, plen);
204	0	return 0;
205	0	}
206
207		int
208		sshbuf_dtourlb64(const struct sshbuf d, struct sshbuf b64, int wrap)
209	0	{
210	0	int r = SSH_ERR_INTERNAL_ERROR;
211	0	u_char *p;
212	0	struct sshbuf *b = NULL;
213	0	size_t i, l;
214
215	0	if ((b = sshbuf_new()) == NULL)
216	0	return SSH_ERR_ALLOC_FAIL;
217		/* Encode using regular base64; we'll transform it once done */
218	0	if ((r = sshbuf_dtob64(d, b, wrap)) != 0)
219	0	goto out;
220		/* remove padding from end of encoded string*/
221	0	for (;;) {
222	0	l = sshbuf_len(b);
223	0	if (l <= 1 \|\| sshbuf_ptr(b) == NULL) {
224	0	r = SSH_ERR_INTERNAL_ERROR;
225	0	goto out;
226	0	}
227	0	if (sshbuf_ptr(b)[l - 1] != '=')
228	0	break;
229	0	if ((r = sshbuf_consume_end(b, 1)) != 0)
230	0	goto out;
231	0	}
232		/* Replace characters with rfc4648 equivalents */
233	0	l = sshbuf_len(b);
234	0	if ((p = sshbuf_mutable_ptr(b)) == NULL) {
235	0	r = SSH_ERR_INTERNAL_ERROR;
236	0	goto out;
237	0	}
238	0	for (i = 0; i < l; i++) {
239	0	if (p[i] == '+')
240	0	p[i] = '-';
241	0	else if (p[i] == '/')
242	0	p[i] = '_';
243	0	}
244	0	r = sshbuf_putb(b64, b);
245	0	out:
246	0	sshbuf_free(b);
247	0	return r;
248	0	}
249
250		char *
251		sshbuf_dup_string(struct sshbuf *buf)
252	0	{
253	0	const u_char p = NULL, s = sshbuf_ptr(buf);
254	0	size_t l = sshbuf_len(buf);
255	0	char *r;
256
257	0	if (s == NULL \|\| l >= SIZE_MAX)
258	0	return NULL;
259		/* accept a nul only as the last character in the buffer */
260	0	if (l > 0 && (p = memchr(s, '\0', l)) != NULL) {
261	0	if (p != s + l - 1)
262	0	return NULL;
263	0	l--; /* the nul is put back below */
264	0	}
265	0	if ((r = malloc(l + 1)) == NULL)
266	0	return NULL;
267	0	if (l > 0)
268	0	memcpy(r, s, l);
269	0	r[l] = '\0';
270	0	return r;
271	0	}
272
273		int
274		sshbuf_cmp(const struct sshbuf *b, size_t offset,
275		const void *s, size_t len)
276	0	{
277	0	if (sshbuf_ptr(b) == NULL)
278	0	return SSH_ERR_INTERNAL_ERROR;
279	0	if (offset > SSHBUF_SIZE_MAX \|\| len > SSHBUF_SIZE_MAX \|\| len == 0)
280	0	return SSH_ERR_INVALID_ARGUMENT;
281	0	if (offset + len > sshbuf_len(b))
282	0	return SSH_ERR_MESSAGE_INCOMPLETE;
283	0	if (timingsafe_bcmp(sshbuf_ptr(b) + offset, s, len) != 0)
284	0	return SSH_ERR_INVALID_FORMAT;
285	0	return 0;
286	0	}
287
288		int
289		sshbuf_find(const struct sshbuf *b, size_t start_offset,
290		const void s, size_t len, size_t offsetp)
291	0	{
292	0	void *p;
293
294	0	if (offsetp != NULL)
295	0	*offsetp = 0;
296	0	if (sshbuf_ptr(b) == NULL)
297	0	return SSH_ERR_INTERNAL_ERROR;
298	0	if (start_offset > SSHBUF_SIZE_MAX \|\| len > SSHBUF_SIZE_MAX \|\| len == 0)
299	0	return SSH_ERR_INVALID_ARGUMENT;
300	0	if (start_offset > sshbuf_len(b) \|\| start_offset + len > sshbuf_len(b))
301	0	return SSH_ERR_MESSAGE_INCOMPLETE;
302	0	if ((p = memmem(sshbuf_ptr(b) + start_offset,
303	0	sshbuf_len(b) - start_offset, s, len)) == NULL)
304	0	return SSH_ERR_INVALID_FORMAT;
305	0	if (offsetp != NULL)
306	0	offsetp = (const u_char )p - sshbuf_ptr(b);
307	0	return 0;
308	0	}
309
310		int
311		sshbuf_read(int fd, struct sshbuf buf, size_t maxlen, size_t rlen)
312	0	{
313	0	int r, oerrno;
314	0	size_t adjust;
315	0	ssize_t rr;
316	0	u_char *d;
317
318	0	if (rlen != NULL)
319	0	*rlen = 0;
320	0	if ((r = sshbuf_reserve(buf, maxlen, &d)) != 0)
321	0	return r;
322	0	rr = read(fd, d, maxlen);
323	0	oerrno = errno;
324
325		/* Adjust the buffer to include only what was actually read */
326	0	if ((adjust = maxlen - (rr > 0 ? rr : 0)) != 0) {
327	0	if ((r = sshbuf_consume_end(buf, adjust)) != 0) {
328		/* avoid returning uninitialised data to caller */
329	0	memset(d + rr, '\0', adjust);
330	0	return SSH_ERR_INTERNAL_ERROR; /* shouldn't happen */
331	0	}
332	0	}
333	0	if (rr < 0) {
334	0	errno = oerrno;
335	0	return SSH_ERR_SYSTEM_ERROR;
336	0	} else if (rr == 0) {
337	0	errno = EPIPE;
338	0	return SSH_ERR_SYSTEM_ERROR;
339	0	}
340		/* success */
341	0	if (rlen != NULL)
342	0	*rlen = (size_t)rr;
343	0	return 0;
344	0	}