-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
+/* SPDX-License-Identifier: LGPL-2.1+ */
/***
- This file is part of systemd.
-
- Copyright (C) 2013 Intel Corporation. All rights reserved.
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
+ Copyright © 2013 Intel Corporation. All rights reserved.
***/
#include <errno.h>
#include <stdio.h>
#include <string.h>
+#include "alloc-util.h"
+#include "utf8.h"
+#include "strv.h"
+
#include "dhcp-internal.h"
static int option_append(uint8_t options[], size_t size, size_t *offset,
assert(options);
assert(offset);
- if (code != DHCP_OPTION_END)
+ if (code != SD_DHCP_OPTION_END)
/* always make sure there is space for an END option */
- size --;
+ size--;
switch (code) {
- case DHCP_OPTION_PAD:
- case DHCP_OPTION_END:
+ case SD_DHCP_OPTION_PAD:
+ case SD_DHCP_OPTION_END:
if (size < *offset + 1)
return -ENOBUFS;
*offset += 1;
break;
- default:
- if (size < *offset + optlen + 2)
+ case SD_DHCP_OPTION_USER_CLASS: {
+ size_t len = 0;
+ char **s;
+
+ STRV_FOREACH(s, (char **) optval)
+ len += strlen(*s) + 1;
+
+ if (size < *offset + len + 2)
return -ENOBUFS;
options[*offset] = code;
- options[*offset + 1] = optlen;
+ options[*offset + 1] = len;
+ *offset += 2;
+
+ STRV_FOREACH(s, (char **) optval) {
+ len = strlen(*s);
- if (optlen) {
- assert(optval);
+ if (len > 255)
+ return -ENAMETOOLONG;
- memcpy(&options[*offset + 2], optval, optlen);
+ options[*offset] = len;
+
+ memcpy_safe(&options[*offset + 1], *s, len);
+ *offset += len + 1;
}
+ break;
+ }
+ default:
+ if (size < *offset + optlen + 2)
+ return -ENOBUFS;
+
+ options[*offset] = code;
+ options[*offset + 1] = optlen;
+
+ memcpy_safe(&options[*offset + 2], optval, optlen);
*offset += optlen + 2;
break;
else if (r == -ENOBUFS && (file || sname)) {
/* did not fit, but we have more buffers to try
close the options array and move the offset to its end */
- r = option_append(message->options, size, offset, DHCP_OPTION_END, 0, NULL);
+ r = option_append(message->options, size, offset, SD_DHCP_OPTION_END, 0, NULL);
if (r < 0)
return r;
} else if (r == -ENOBUFS && sname) {
/* did not fit, but we have more buffers to try
close the file array and move the offset to its end */
- r = option_append(message->options, size, offset, DHCP_OPTION_END, 0, NULL);
+ r = option_append(message->options, size, offset, SD_DHCP_OPTION_END, 0, NULL);
if (r < 0)
return r;
}
static int parse_options(const uint8_t options[], size_t buflen, uint8_t *overload,
- uint8_t *message_type, dhcp_option_cb_t cb,
+ uint8_t *message_type, char **error_message, dhcp_option_callback_t cb,
void *userdata) {
uint8_t code, len;
+ const uint8_t *option;
size_t offset = 0;
while (offset < buflen) {
- switch (options[offset]) {
- case DHCP_OPTION_PAD:
- offset++;
+ code = options[offset ++];
- break;
+ switch (code) {
+ case SD_DHCP_OPTION_PAD:
+ continue;
- case DHCP_OPTION_END:
+ case SD_DHCP_OPTION_END:
return 0;
+ }
+
+ if (buflen < offset + 1)
+ return -ENOBUFS;
- case DHCP_OPTION_MESSAGE_TYPE:
- if (buflen < offset + 3)
- return -ENOBUFS;
+ len = options[offset ++];
- len = options[++offset];
+ if (buflen < offset + len)
+ return -EINVAL;
+
+ option = &options[offset];
+
+ switch (code) {
+ case SD_DHCP_OPTION_MESSAGE_TYPE:
if (len != 1)
return -EINVAL;
if (message_type)
- *message_type = options[++offset];
- else
- offset++;
-
- offset++;
+ *message_type = *option;
break;
- case DHCP_OPTION_OVERLOAD:
- if (buflen < offset + 3)
- return -ENOBUFS;
-
- len = options[++offset];
- if (len != 1)
+ case SD_DHCP_OPTION_ERROR_MESSAGE:
+ if (len == 0)
return -EINVAL;
- if (overload)
- *overload = options[++offset];
- else
- offset++;
+ if (error_message) {
+ _cleanup_free_ char *string = NULL;
- offset++;
+ /* Accept a trailing NUL byte */
+ if (memchr(option, 0, len - 1))
+ return -EINVAL;
- break;
+ string = strndup((const char *) option, len);
+ if (!string)
+ return -ENOMEM;
- default:
- if (buflen < offset + 3)
- return -ENOBUFS;
+ if (!ascii_is_valid(string))
+ return -EINVAL;
- code = options[offset];
- len = options[++offset];
+ free_and_replace(*error_message, string);
+ }
- if (buflen < ++offset + len)
+ break;
+ case SD_DHCP_OPTION_OVERLOAD:
+ if (len != 1)
return -EINVAL;
- if (cb)
- cb(code, len, &options[offset], userdata);
+ if (overload)
+ *overload = *option;
- offset += len;
+ break;
+
+ default:
+ if (cb)
+ cb(code, len, option, userdata);
break;
}
+
+ offset += len;
}
if (offset < buflen)
return 0;
}
-int dhcp_option_parse(DHCPMessage *message, size_t len,
- dhcp_option_cb_t cb, void *userdata) {
+int dhcp_option_parse(DHCPMessage *message, size_t len, dhcp_option_callback_t cb, void *userdata, char **_error_message) {
+ _cleanup_free_ char *error_message = NULL;
uint8_t overload = 0;
uint8_t message_type = 0;
int r;
len -= sizeof(DHCPMessage);
- r = parse_options(message->options, len, &overload, &message_type,
- cb, userdata);
+ r = parse_options(message->options, len, &overload, &message_type, &error_message, cb, userdata);
if (r < 0)
return r;
if (overload & DHCP_OVERLOAD_FILE) {
- r = parse_options(message->file, sizeof(message->file),
- NULL, &message_type, cb, userdata);
+ r = parse_options(message->file, sizeof(message->file), NULL, &message_type, &error_message, cb, userdata);
if (r < 0)
return r;
}
if (overload & DHCP_OVERLOAD_SNAME) {
- r = parse_options(message->sname, sizeof(message->sname),
- NULL, &message_type, cb, userdata);
+ r = parse_options(message->sname, sizeof(message->sname), NULL, &message_type, &error_message, cb, userdata);
if (r < 0)
return r;
}
- if (message_type)
- return message_type;
+ if (message_type == 0)
+ return -ENOMSG;
+
+ if (_error_message && IN_SET(message_type, DHCP_NAK, DHCP_DECLINE))
+ *_error_message = TAKE_PTR(error_message);
- return -ENOMSG;
+ return message_type;
}
projects / thirdparty / systemd.git / blobdiff