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1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright (C) 2013 Intel Corporation. All rights reserved. | |
5 | Copyright (C) 2014 Tom Gundersen | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <stdlib.h> | |
22 | #include <errno.h> | |
23 | #include <string.h> | |
24 | #include <stdio.h> | |
25 | #include <net/ethernet.h> | |
26 | #include <sys/param.h> | |
27 | ||
28 | #include "util.h" | |
29 | #include "list.h" | |
30 | ||
31 | #include "dhcp-protocol.h" | |
32 | #include "dhcp-internal.h" | |
33 | #include "dhcp-lease.h" | |
34 | #include "sd-dhcp-client.h" | |
35 | ||
36 | int sd_dhcp_lease_get_address(sd_dhcp_lease *lease, struct in_addr *addr) { | |
37 | assert_return(lease, -EINVAL); | |
38 | assert_return(addr, -EINVAL); | |
39 | ||
40 | addr->s_addr = lease->address; | |
41 | ||
42 | return 0; | |
43 | } | |
44 | ||
45 | int sd_dhcp_lease_get_mtu(sd_dhcp_lease *lease, uint16_t *mtu) { | |
46 | assert_return(lease, -EINVAL); | |
47 | assert_return(mtu, -EINVAL); | |
48 | ||
49 | if (lease->mtu) | |
50 | *mtu = lease->mtu; | |
51 | else | |
52 | return -ENOENT; | |
53 | ||
54 | return 0; | |
55 | } | |
56 | ||
57 | int sd_dhcp_lease_get_dns(sd_dhcp_lease *lease, struct in_addr **addr, size_t *addr_size) { | |
58 | assert_return(lease, -EINVAL); | |
59 | assert_return(addr, -EINVAL); | |
60 | assert_return(addr_size, -EINVAL); | |
61 | ||
62 | if (lease->dns_size) { | |
63 | *addr_size = lease->dns_size; | |
64 | *addr = lease->dns; | |
65 | } else | |
66 | return -ENOENT; | |
67 | ||
68 | return 0; | |
69 | } | |
70 | ||
71 | int sd_dhcp_lease_get_domainname(sd_dhcp_lease *lease, const char **domainname) { | |
72 | assert_return(lease, -EINVAL); | |
73 | assert_return(domainname, -EINVAL); | |
74 | ||
75 | if (lease->domainname) | |
76 | *domainname = lease->domainname; | |
77 | else | |
78 | return -ENOENT; | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | int sd_dhcp_lease_get_hostname(sd_dhcp_lease *lease, const char **hostname) { | |
84 | assert_return(lease, -EINVAL); | |
85 | assert_return(hostname, -EINVAL); | |
86 | ||
87 | if (lease->hostname) | |
88 | *hostname = lease->hostname; | |
89 | else | |
90 | return -ENOENT; | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
95 | int sd_dhcp_lease_get_router(sd_dhcp_lease *lease, struct in_addr *addr) { | |
96 | assert_return(lease, -EINVAL); | |
97 | assert_return(addr, -EINVAL); | |
98 | ||
99 | addr->s_addr = lease->router; | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | int sd_dhcp_lease_get_netmask(sd_dhcp_lease *lease, struct in_addr *addr) { | |
105 | assert_return(lease, -EINVAL); | |
106 | assert_return(addr, -EINVAL); | |
107 | ||
108 | addr->s_addr = lease->subnet_mask; | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | sd_dhcp_lease *sd_dhcp_lease_ref(sd_dhcp_lease *lease) { | |
114 | if (lease) | |
115 | assert_se(REFCNT_INC(lease->n_ref) >= 2); | |
116 | ||
117 | return lease; | |
118 | } | |
119 | ||
120 | sd_dhcp_lease *sd_dhcp_lease_unref(sd_dhcp_lease *lease) { | |
121 | if (lease && REFCNT_DEC(lease->n_ref) <= 0) { | |
122 | free(lease->hostname); | |
123 | free(lease->domainname); | |
124 | free(lease->dns); | |
125 | free(lease); | |
126 | } | |
127 | ||
128 | return NULL; | |
129 | } | |
130 | ||
131 | int dhcp_lease_parse_options(uint8_t code, uint8_t len, const uint8_t *option, | |
132 | void *user_data) { | |
133 | sd_dhcp_lease *lease = user_data; | |
134 | be32_t val; | |
135 | ||
136 | switch(code) { | |
137 | ||
138 | case DHCP_OPTION_IP_ADDRESS_LEASE_TIME: | |
139 | if (len == 4) { | |
140 | memcpy(&val, option, 4); | |
141 | lease->lifetime = be32toh(val); | |
142 | } | |
143 | ||
144 | break; | |
145 | ||
146 | case DHCP_OPTION_SERVER_IDENTIFIER: | |
147 | if (len >= 4) | |
148 | memcpy(&lease->server_address, option, 4); | |
149 | ||
150 | break; | |
151 | ||
152 | case DHCP_OPTION_SUBNET_MASK: | |
153 | if (len >= 4) | |
154 | memcpy(&lease->subnet_mask, option, 4); | |
155 | ||
156 | break; | |
157 | ||
158 | case DHCP_OPTION_ROUTER: | |
159 | if (len >= 4) | |
160 | memcpy(&lease->router, option, 4); | |
161 | ||
162 | break; | |
163 | ||
164 | case DHCP_OPTION_DOMAIN_NAME_SERVER: | |
165 | if (len && !(len % 4)) { | |
166 | unsigned i; | |
167 | ||
168 | lease->dns_size = len / 4; | |
169 | ||
170 | free(lease->dns); | |
171 | lease->dns = new0(struct in_addr, lease->dns_size); | |
172 | if (!lease->dns) | |
173 | return -ENOMEM; | |
174 | ||
175 | for (i = 0; i < lease->dns_size; i++) { | |
176 | memcpy(&lease->dns[i].s_addr, option + 4 * i, 4); | |
177 | } | |
178 | } | |
179 | ||
180 | break; | |
181 | ||
182 | case DHCP_OPTION_INTERFACE_MTU: | |
183 | if (len >= 2) { | |
184 | be16_t mtu; | |
185 | ||
186 | memcpy(&mtu, option, 2); | |
187 | lease->mtu = be16toh(mtu); | |
188 | ||
189 | if (lease->mtu < 68) | |
190 | lease->mtu = 0; | |
191 | } | |
192 | ||
193 | break; | |
194 | ||
195 | case DHCP_OPTION_DOMAIN_NAME: | |
196 | if (len >= 1) { | |
197 | free(lease->domainname); | |
198 | lease->domainname = strndup((const char *)option, len); | |
199 | } | |
200 | ||
201 | break; | |
202 | ||
203 | case DHCP_OPTION_HOST_NAME: | |
204 | if (len >= 1) { | |
205 | free(lease->hostname); | |
206 | lease->hostname = strndup((const char *)option, len); | |
207 | } | |
208 | ||
209 | break; | |
210 | ||
211 | case DHCP_OPTION_RENEWAL_T1_TIME: | |
212 | if (len == 4) { | |
213 | memcpy(&val, option, 4); | |
214 | lease->t1 = be32toh(val); | |
215 | } | |
216 | ||
217 | break; | |
218 | ||
219 | case DHCP_OPTION_REBINDING_T2_TIME: | |
220 | if (len == 4) { | |
221 | memcpy(&val, option, 4); | |
222 | lease->t2 = be32toh(val); | |
223 | } | |
224 | ||
225 | break; | |
226 | } | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | int dhcp_lease_new(sd_dhcp_lease **ret) { | |
232 | _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL; | |
233 | ||
234 | lease = new0(sd_dhcp_lease, 1); | |
235 | if (!lease) | |
236 | return -ENOMEM; | |
237 | ||
238 | lease->n_ref = REFCNT_INIT; | |
239 | ||
240 | *ret = lease; | |
241 | lease = NULL; | |
242 | ||
243 | return 0; | |
244 | } |