2 * Copyright (C) 2012-2014 Steven Barth <steven@midlink.org>
3 * Copyright (C) 2017-2018 Hans Dedecker <dedeckeh@gmail.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License v2 as published by
7 * the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
33 #include <sys/syscall.h>
34 #include <arpa/inet.h>
35 #include <linux/if_addr.h>
40 #ifndef IN6_IS_ADDR_UNIQUELOCAL
41 #define IN6_IS_ADDR_UNIQUELOCAL(a) \
42 ((((__const uint32_t *) (a))[0] & htonl (0xfe000000)) \
43 == htonl (0xfc000000))
45 #define ARRAY_SEP " ,\t"
47 static void sighandler(int signal
);
48 static int usage(void);
49 static int add_opt(const uint16_t code
, const uint8_t *data
,
51 static int parse_opt_data(const char *data
, uint8_t **dst
,
52 const unsigned int type
, const bool array
);
53 static int parse_opt(const char *opt
);
55 static uint8_t *state_data
[_STATE_MAX
] = {NULL
};
56 static size_t state_len
[_STATE_MAX
] = {0};
58 static volatile bool signal_io
= false;
59 static volatile bool signal_usr1
= false;
60 static volatile bool signal_usr2
= false;
61 static volatile bool signal_term
= false;
63 static int urandom_fd
= -1, allow_slaac_only
= 0;
64 static bool bound
= false, release
= true, ra
= false;
65 static time_t last_update
= 0;
66 static char *ifname
= NULL
;
68 static unsigned int script_sync_delay
= 10;
69 static unsigned int script_accu_delay
= 1;
71 static struct odhcp6c_opt opts
[] = {
72 { .code
= DHCPV6_OPT_CLIENTID
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
73 { .code
= DHCPV6_OPT_SERVERID
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
74 { .code
= DHCPV6_OPT_IA_NA
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
75 { .code
= DHCPV6_OPT_IA_TA
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
76 { .code
= DHCPV6_OPT_IA_ADDR
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
77 { .code
= DHCPV6_OPT_ORO
, .flags
= OPT_INTERNAL
, .str
= NULL
},
78 { .code
= DHCPV6_OPT_PREF
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
79 { .code
= DHCPV6_OPT_ELAPSED
, .flags
= OPT_INTERNAL
, .str
= NULL
},
80 { .code
= DHCPV6_OPT_RELAY_MSG
, .flags
= OPT_INTERNAL
, .str
= NULL
},
81 { .code
= DHCPV6_OPT_AUTH
, .flags
= OPT_U8
| OPT_NO_PASSTHRU
, .str
= "authentication" },
82 { .code
= DHCPV6_OPT_UNICAST
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
83 { .code
= DHCPV6_OPT_STATUS
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
84 { .code
= DHCPV6_OPT_RAPID_COMMIT
, .flags
= OPT_INTERNAL
, .str
= NULL
},
85 { .code
= DHCPV6_OPT_USER_CLASS
, .flags
= OPT_USER_CLASS
| OPT_ARRAY
, .str
= "userclass" },
86 { .code
= DHCPV6_OPT_VENDOR_CLASS
, .flags
= OPT_U8
, .str
= "vendorclass" },
87 { .code
= DHCPV6_OPT_INTERFACE_ID
, .flags
= OPT_INTERNAL
, .str
= NULL
},
88 { .code
= DHCPV6_OPT_RECONF_MESSAGE
, .flags
= OPT_INTERNAL
, .str
= NULL
},
89 { .code
= DHCPV6_OPT_RECONF_ACCEPT
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
90 { .code
= DHCPV6_OPT_SIP_SERVER_D
, .flags
= OPT_DNS_STR
| OPT_ORO
, .str
= "sipserver_d" },
91 { .code
= DHCPV6_OPT_SIP_SERVER_A
, .flags
= OPT_IP6
| OPT_ARRAY
| OPT_ORO
, .str
= "sipserver_a" },
92 { .code
= DHCPV6_OPT_DNS_SERVERS
, .flags
= OPT_IP6
| OPT_ARRAY
| OPT_ORO
, .str
= "dns" },
93 { .code
= DHCPV6_OPT_DNS_DOMAIN
, .flags
= OPT_DNS_STR
| OPT_ORO
, .str
= "search" },
94 { .code
= DHCPV6_OPT_IA_PD
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
95 { .code
= DHCPV6_OPT_IA_PREFIX
, .flags
= OPT_INTERNAL
, .str
= NULL
},
96 { .code
= DHCPV6_OPT_SNTP_SERVERS
, .flags
= OPT_IP6
| OPT_ARRAY
| OPT_ORO
, .str
= "sntpservers" },
97 { .code
= DHCPV6_OPT_INFO_REFRESH
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
| OPT_ORO
| OPT_ORO_STATELESS
, .str
= NULL
},
98 { .code
= DHCPV6_OPT_REMOTE_ID
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
99 { .code
= DHCPV6_OPT_SUBSCRIBER_ID
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
100 { .code
= DHCPV6_OPT_FQDN
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
| OPT_ORO
, .str
= NULL
},
101 { .code
= DHCPV6_OPT_ERO
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
102 { .code
= DHCPV6_OPT_LQ_QUERY
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
103 { .code
= DHCPV6_OPT_CLIENT_DATA
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
104 { .code
= DHCPV6_OPT_CLT_TIME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
105 { .code
= DHCPV6_OPT_LQ_RELAY_DATA
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
106 { .code
= DHCPV6_OPT_LQ_CLIENT_LINK
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
107 { .code
= DHCPV6_OPT_RELAY_ID
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
108 { .code
= DHCPV6_OPT_NTP_SERVER
, .flags
= OPT_U8
| OPT_ORO
, .str
= "ntpserver" },
109 { .code
= DHCPV6_OPT_CLIENT_ARCH_TYPE
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
110 { .code
= DHCPV6_OPT_AFTR_NAME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
| OPT_ORO
, .str
= NULL
},
111 { .code
= DHCPV6_OPT_RSOO
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
112 { .code
= DHCPV6_OPT_PD_EXCLUDE
, .flags
= OPT_INTERNAL
| OPT_ORO
| OPT_ORO_STATEFUL
, .str
= NULL
},
113 { .code
= DHCPV6_OPT_VSS
, .flags
= OPT_U8
, .str
= "vss" },
114 { .code
= DHCPV6_OPT_LINK_LAYER_ADDRESS
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
115 { .code
= DHCPV6_OPT_LINK_ADDRESS
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
116 { .code
= DHCPV6_OPT_RADIUS
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
117 { .code
= DHCPV6_OPT_SOL_MAX_RT
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
| OPT_ORO
| OPT_ORO_SOLICIT
, .str
= NULL
},
118 { .code
= DHCPV6_OPT_INF_MAX_RT
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
| OPT_ORO
| OPT_ORO_STATELESS
, .str
= NULL
},
120 { .code
= DHCPV6_OPT_CER_ID
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
122 { .code
= DHCPV6_OPT_DHCPV4_MSG
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
123 { .code
= DHCPV6_OPT_S46_RULE
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
124 { .code
= DHCPV6_OPT_S46_BR
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
125 { .code
= DHCPV6_OPT_S46_DMR
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
126 { .code
= DHCPV6_OPT_S46_V4V6BIND
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
127 { .code
= DHCPV6_OPT_S46_PORTPARAMS
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
128 { .code
= DHCPV6_OPT_S46_CONT_MAPE
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
| OPT_ORO
, .str
= NULL
},
129 { .code
= DHCPV6_OPT_S46_CONT_MAPT
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
| OPT_ORO
, .str
= NULL
},
130 { .code
= DHCPV6_OPT_S46_CONT_LW
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
| OPT_ORO
, .str
= NULL
},
131 { .code
= DHCPV6_OPT_LQ_BASE_TIME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
132 { .code
= DHCPV6_OPT_LQ_START_TIME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
133 { .code
= DHCPV6_OPT_LQ_END_TIME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
134 { .code
= DHCPV6_OPT_ANI_ATT
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
135 { .code
= DHCPV6_OPT_ANI_NETWORK_NAME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
136 { .code
= DHCPV6_OPT_ANI_AP_NAME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
137 { .code
= DHCPV6_OPT_ANI_AP_BSSID
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
138 { .code
= DHCPV6_OPT_ANI_OPERATOR_ID
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
139 { .code
= DHCPV6_OPT_ANI_OPERATOR_REALM
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
140 { .code
= DHCPV6_OPT_MUD_URL_V6
, .flags
= OPT_STR
| OPT_NO_PASSTHRU
, .str
= "mud_url_v6" },
141 { .code
= DHCPV6_OPT_F_BINDING_STATUS
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
142 { .code
= DHCPV6_OPT_F_CONNECT_FLAGS
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
143 { .code
= DHCPV6_OPT_F_DNS_REMOVAL_INFO
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
144 { .code
= DHCPV6_OPT_F_DNS_HOST_NAME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
145 { .code
= DHCPV6_OPT_F_DNS_ZONE_NAME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
146 { .code
= DHCPV6_OPT_F_DNS_FLAGS
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
147 { .code
= DHCPV6_OPT_F_EXPIRATION_TIME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
148 { .code
= DHCPV6_OPT_F_MAX_UNACKED_BNDUPD
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
149 { .code
= DHCPV6_OPT_F_MCLT
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
150 { .code
= DHCPV6_OPT_F_PARTNER_LIFETIME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
151 { .code
= DHCPV6_OPT_F_PARTNER_LIFETIME_SENT
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
152 { .code
= DHCPV6_OPT_F_PARTNER_DOWN_TIME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
153 { .code
= DHCPV6_OPT_F_PARTNER_RAW_CLT_TIME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
154 { .code
= DHCPV6_OPT_F_PROTOCOL_VERSION
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
155 { .code
= DHCPV6_OPT_F_KEEPALIVE_TIME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
156 { .code
= DHCPV6_OPT_F_RECONFIGURE_DATA
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
157 { .code
= DHCPV6_OPT_F_RELATIONSHIP_NAME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
158 { .code
= DHCPV6_OPT_F_SERVER_FLAGS
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
159 { .code
= DHCPV6_OPT_F_SERVER_STATE
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
160 { .code
= DHCPV6_OPT_F_START_TIME_OF_STATE
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
161 { .code
= DHCPV6_OPT_F_STATE_EXPIRATION_TIME
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
162 { .code
= DHCPV6_OPT_RELAY_PORT
, .flags
= OPT_INTERNAL
| OPT_NO_PASSTHRU
, .str
= NULL
},
163 { .code
= 0, .flags
= 0, .str
= NULL
},
166 int main(_unused
int argc
, char* const argv
[])
168 static struct in6_addr ifid
= IN6ADDR_ANY_INIT
;
169 // Allocate resources
170 const char *pidfile
= NULL
;
171 const char *script
= "/usr/sbin/odhcp6c-update";
173 uint8_t buf
[134], *o_data
;
176 enum odhcp6c_ia_mode ia_na_mode
= IA_MODE_TRY
;
177 enum odhcp6c_ia_mode ia_pd_mode
= IA_MODE_NONE
;
178 bool stateful_only_mode
= 0;
179 struct odhcp6c_opt
*opt
;
180 int ia_pd_iaid_index
= 0;
182 int sol_timeout
= DHCPV6_SOL_MAX_RT
;
184 bool help
= false, daemonize
= false;
185 int logopt
= LOG_PID
;
187 unsigned int client_options
= DHCPV6_CLIENT_FQDN
| DHCPV6_ACCEPT_RECONFIGURE
;
188 unsigned int ra_options
= RA_RDNSS_DEFAULT_LIFETIME
;
189 unsigned int ra_holdoff_interval
= RA_MIN_ADV_INTERVAL
;
191 while ((c
= getopt(argc
, argv
, "S::DN:V:P:FB:c:i:r:Ru:Ux:s:kK:t:m:Lhedp:fav")) != -1) {
194 allow_slaac_only
= (optarg
) ? atoi(optarg
) : -1;
198 stateful_only_mode
= 1;
202 if (!strcmp(optarg
, "force")) {
203 ia_na_mode
= IA_MODE_FORCE
;
204 allow_slaac_only
= -1;
205 } else if (!strcmp(optarg
, "none"))
206 ia_na_mode
= IA_MODE_NONE
;
207 else if (!strcmp(optarg
, "try"))
208 ia_na_mode
= IA_MODE_TRY
;
214 opt
= odhcp6c_find_opt(DHCPV6_OPT_VENDOR_CLASS
);
216 syslog(LOG_ERR
, "Failed to set vendor-class option");
221 res
= parse_opt_data(optarg
, &o_data
, opt
->flags
& OPT_MASK_SIZE
,
222 (opt
->flags
& OPT_ARRAY
) == OPT_ARRAY
);
224 res
= add_opt(opt
->code
, o_data
, res
);
238 if (ia_pd_mode
== IA_MODE_NONE
)
239 ia_pd_mode
= IA_MODE_TRY
;
241 if (allow_slaac_only
>= 0 && allow_slaac_only
< 10)
242 allow_slaac_only
= 10;
246 int prefix_length
= strtoul(optarg
, &iaid_begin
, 10);
248 if (*iaid_begin
!= '\0' && *iaid_begin
!= ',' && *iaid_begin
!= ':') {
249 syslog(LOG_ERR
, "invalid argument: '%s'", optarg
);
253 struct odhcp6c_request_prefix prefix
= { 0, prefix_length
};
255 if (*iaid_begin
== ',' && (iaid_len
= strlen(iaid_begin
)) > 1)
256 memcpy(&prefix
.iaid
, iaid_begin
+ 1, iaid_len
> 4 ? 4 : iaid_len
);
257 else if (*iaid_begin
== ':')
258 prefix
.iaid
= htonl((uint32_t)strtoul(&iaid_begin
[1], NULL
, 16));
260 prefix
.iaid
= htonl(++ia_pd_iaid_index
);
262 if (odhcp6c_add_state(STATE_IA_PD_INIT
, &prefix
, sizeof(prefix
))) {
263 syslog(LOG_ERR
, "Failed to set request IPv6-Prefix");
269 allow_slaac_only
= -1;
270 ia_pd_mode
= IA_MODE_FORCE
;
274 l
= script_unhexlify(&buf
[4], sizeof(buf
) - 4, optarg
);
277 buf
[1] = DHCPV6_OPT_CLIENTID
;
280 if (odhcp6c_add_state(STATE_CLIENT_ID
, buf
, l
+ 4)) {
281 syslog(LOG_ERR
, "Failed to override client-ID");
289 if (inet_pton(AF_INET6
, optarg
, &ifid
) != 1)
296 opttype
= htons(strtoul(optarg
, &optpos
, 10));
297 if (optpos
== optarg
)
302 if (odhcp6c_add_state(STATE_ORO
, &opttype
, 2)) {
303 syslog(LOG_ERR
, "Failed to add requested option");
310 client_options
|= DHCPV6_STRICT_OPTIONS
;
314 opt
= odhcp6c_find_opt(DHCPV6_OPT_USER_CLASS
);
316 syslog(LOG_ERR
, "Failed to set user-class option");
321 res
= parse_opt_data(optarg
, &o_data
, opt
->flags
& OPT_MASK_SIZE
,
322 (opt
->flags
& OPT_ARRAY
) == OPT_ARRAY
);
324 res
= add_opt(opt
->code
, o_data
, res
);
338 client_options
|= DHCPV6_IGNORE_OPT_UNICAST
;
350 sk_prio
= atoi(optarg
);
354 sol_timeout
= atoi(optarg
);
358 ra_holdoff_interval
= atoi(optarg
);
362 ra_options
&= ~RA_RDNSS_DEFAULT_LIFETIME
;
366 logopt
|= LOG_PERROR
;
378 client_options
&= ~DHCPV6_CLIENT_FQDN
;
382 client_options
&= ~DHCPV6_ACCEPT_RECONFIGURE
;
390 res
= parse_opt(optarg
);
405 if (allow_slaac_only
> 0)
406 script_sync_delay
= allow_slaac_only
;
408 openlog("odhcp6c", logopt
, LOG_DAEMON
);
410 setlogmask(LOG_UPTO(LOG_WARNING
));
412 ifname
= argv
[optind
];
417 signal(SIGIO
, sighandler
);
418 signal(SIGHUP
, sighandler
);
419 signal(SIGINT
, sighandler
);
420 signal(SIGTERM
, sighandler
);
421 signal(SIGUSR1
, sighandler
);
422 signal(SIGUSR2
, sighandler
);
424 if ((urandom_fd
= open("/dev/urandom", O_CLOEXEC
| O_RDONLY
)) < 0 ||
425 init_dhcpv6(ifname
, client_options
, sk_prio
, sol_timeout
) ||
426 ra_init(ifname
, &ifid
, ra_options
, ra_holdoff_interval
) ||
427 script_init(script
, ifname
)) {
428 syslog(LOG_ERR
, "failed to initialize: %s", strerror(errno
));
433 openlog("odhcp6c", LOG_PID
, LOG_DAEMON
); // Disable LOG_PERROR
435 syslog(LOG_ERR
, "Failed to daemonize: %s",
441 snprintf((char*)buf
, sizeof(buf
), "/var/run/odhcp6c.%s.pid", ifname
);
442 pidfile
= (char*)buf
;
445 FILE *fp
= fopen(pidfile
, "w");
447 fprintf(fp
, "%i\n", getpid());
452 script_call("started", 0, false);
454 while (!signal_term
) { // Main logic
455 odhcp6c_clear_state(STATE_SERVER_ID
);
456 odhcp6c_clear_state(STATE_SERVER_ADDR
);
457 odhcp6c_clear_state(STATE_IA_NA
);
458 odhcp6c_clear_state(STATE_IA_PD
);
459 odhcp6c_clear_state(STATE_SNTP_IP
);
460 odhcp6c_clear_state(STATE_NTP_IP
);
461 odhcp6c_clear_state(STATE_NTP_FQDN
);
462 odhcp6c_clear_state(STATE_SIP_IP
);
463 odhcp6c_clear_state(STATE_SIP_FQDN
);
466 syslog(LOG_NOTICE
, "(re)starting transaction on %s", ifname
);
468 signal_usr1
= signal_usr2
= false;
469 int mode
= dhcpv6_set_ia_mode(ia_na_mode
, ia_pd_mode
, stateful_only_mode
);
470 if (mode
!= DHCPV6_STATELESS
)
471 mode
= dhcpv6_request(DHCPV6_MSG_SOLICIT
);
473 odhcp6c_signal_process();
479 res
= dhcpv6_request(mode
== DHCPV6_STATELESS
?
480 DHCPV6_MSG_INFO_REQ
: DHCPV6_MSG_REQUEST
);
481 bool signalled
= odhcp6c_signal_process();
485 else if (signalled
) {
490 mode
= dhcpv6_promote_server_cand();
491 } while (mode
> DHCPV6_UNKNOWN
);
497 case DHCPV6_STATELESS
:
499 syslog(LOG_NOTICE
, "entering stateless-mode on %s", ifname
);
501 while (!signal_usr2
&& !signal_term
) {
503 script_call("informed", script_sync_delay
, true);
505 res
= dhcpv6_poll_reconfigure();
506 odhcp6c_signal_process();
512 signal_usr1
= false; // Acknowledged
516 if (signal_usr2
|| signal_term
)
519 res
= dhcpv6_request(DHCPV6_MSG_INFO_REQ
);
520 odhcp6c_signal_process();
529 case DHCPV6_STATEFUL
:
531 script_call("bound", script_sync_delay
, true);
532 syslog(LOG_NOTICE
, "entering stateful-mode on %s", ifname
);
534 while (!signal_usr2
&& !signal_term
) {
536 // Wait for T1 to expire or until we get a reconfigure
537 res
= dhcpv6_poll_reconfigure();
538 odhcp6c_signal_process();
540 script_call("updated", 0, false);
544 // Handle signal, if necessary
546 signal_usr1
= false; // Acknowledged
548 if (signal_usr2
|| signal_term
)
549 break; // Other signal type
551 // Send renew as T1 expired
552 res
= dhcpv6_request(DHCPV6_MSG_RENEW
);
553 odhcp6c_signal_process();
555 if (res
> 0) { // Renew was succesfull
557 script_call("updated", 0, false);
558 continue; // Renew was successful
561 odhcp6c_clear_state(STATE_SERVER_ID
); // Remove binding
562 odhcp6c_clear_state(STATE_SERVER_ADDR
);
564 size_t ia_pd_len
, ia_na_len
;
565 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
566 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
568 if (ia_pd_len
== 0 && ia_na_len
== 0)
571 // If we have IAs, try rebind otherwise restart
572 res
= dhcpv6_request(DHCPV6_MSG_REBIND
);
573 odhcp6c_signal_process();
576 script_call("rebound", 0, true);
586 odhcp6c_expire(false);
588 size_t ia_pd_len
, ia_na_len
, server_id_len
;
589 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
590 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
591 odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
593 // Add all prefixes to lost prefixes
595 script_call("unbound", 0, true);
597 if (server_id_len
> 0 && (ia_pd_len
> 0 || ia_na_len
> 0) && release
)
598 dhcpv6_request(DHCPV6_MSG_RELEASE
);
600 odhcp6c_clear_state(STATE_IA_NA
);
601 odhcp6c_clear_state(STATE_IA_PD
);
604 script_call("stopped", 0, true);
609 static int usage(void)
612 "Usage: odhcp6c [options] <interface>\n"
613 "\nFeature options:\n"
614 " -S <time> Wait at least <time> sec for a DHCP-server (0)\n"
615 " -D Discard advertisements without any address or prefix proposed\n"
616 " -N <mode> Mode for requesting addresses [try|force|none]\n"
617 " -P <length> Request IPv6-Prefix (0 = auto)\n"
618 " -F Force IPv6-Prefix\n"
619 " -V <class> Set vendor-class option (base-16 encoded)\n"
620 " -u <user-class> Set user-class option string\n"
621 " -x <opt>:<val> Add option opt (with value val) in sent packets (cumulative)\n"
622 " Examples of IPv6 address, string and base-16 encoded options:\n"
623 " -x dns:2001:2001::1,2001:2001::2 - option 23\n"
624 " -x 15:office - option 15 (userclass)\n"
625 " -x 0x1f4:ABBA - option 500\n"
626 " -x 202:'\"file\"' - option 202\n"
627 " -c <clientid> Override client-ID (base-16 encoded 16-bit type + value)\n"
628 " -i <iface-id> Use a custom interface identifier for RA handling\n"
629 " -r <options> Options to be requested (comma-separated)\n"
630 " -R Do not request any options except those specified with -r\n"
631 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
632 " -a Don't send Accept Reconfigure option\n"
633 " -f Don't send Client FQDN option\n"
634 " -k Don't send a RELEASE when stopping\n"
635 " -K <sk-prio> Set packet kernel priority (0)\n"
636 " -t <seconds> Maximum timeout for DHCPv6-SOLICIT (120)\n"
637 " -m <seconds> Minimum time between accepting RA updates (3)\n"
638 " -L Ignore default lifetime for RDNSS records\n"
639 " -U Ignore Server Unicast option\n"
640 "\nInvocation options:\n"
641 " -p <pidfile> Set pidfile (/var/run/odhcp6c.pid)\n"
643 " -e Write logmessages to stderr\n"
644 " -v Increase logging verbosity\n"
645 " -h Show this help\n\n";
651 // Don't want to pull-in librt and libpthread just for a monotonic clock...
652 uint64_t odhcp6c_get_milli_time(void)
656 clock_gettime(CLOCK_MONOTONIC
, &t
);
658 return ((uint64_t)t
.tv_sec
) * 1000 + ((uint64_t)t
.tv_nsec
) / 1000000;
661 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state
, ssize_t len
)
664 return state_data
[state
] + state_len
[state
];
665 else if (state_len
[state
] + len
> 1024)
668 uint8_t *n
= realloc(state_data
[state
], state_len
[state
] + len
);
670 if (n
|| state_len
[state
] + len
== 0) {
671 state_data
[state
] = n
;
672 n
+= state_len
[state
];
673 state_len
[state
] += len
;
679 bool odhcp6c_signal_process(void)
684 bool ra_updated
= ra_process();
691 if (ra_updated
&& (bound
|| allow_slaac_only
>= 0)) {
692 script_call("ra-updated", (!ra
&& !bound
) ?
693 script_sync_delay
: script_accu_delay
, false);
698 return signal_usr1
|| signal_usr2
|| signal_term
;
701 void odhcp6c_clear_state(enum odhcp6c_state state
)
703 state_len
[state
] = 0;
706 int odhcp6c_add_state(enum odhcp6c_state state
, const void *data
, size_t len
)
708 uint8_t *n
= odhcp6c_resize_state(state
, len
);
713 memcpy(n
, data
, len
);
718 int odhcp6c_insert_state(enum odhcp6c_state state
, size_t offset
, const void *data
, size_t len
)
720 ssize_t len_after
= state_len
[state
] - offset
;
724 uint8_t *n
= odhcp6c_resize_state(state
, len
);
727 uint8_t *sdata
= state_data
[state
];
729 memmove(sdata
+ offset
+ len
, sdata
+ offset
, len_after
);
730 memcpy(sdata
+ offset
, data
, len
);
736 size_t odhcp6c_remove_state(enum odhcp6c_state state
, size_t offset
, size_t len
)
738 uint8_t *data
= state_data
[state
];
739 ssize_t len_after
= state_len
[state
] - (offset
+ len
);
742 return state_len
[state
];
744 memmove(data
+ offset
, data
+ offset
+ len
, len_after
);
746 return state_len
[state
] -= len
;
749 void* odhcp6c_move_state(enum odhcp6c_state state
, size_t *len
)
751 *len
= state_len
[state
];
752 void *data
= state_data
[state
];
754 state_len
[state
] = 0;
755 state_data
[state
] = NULL
;
760 void* odhcp6c_get_state(enum odhcp6c_state state
, size_t *len
)
762 *len
= state_len
[state
];
764 return state_data
[state
];
767 static struct odhcp6c_entry
* odhcp6c_find_entry(enum odhcp6c_state state
, const struct odhcp6c_entry
*new)
769 size_t len
, cmplen
= offsetof(struct odhcp6c_entry
, target
) + ((new->length
+ 7) / 8);
770 uint8_t *start
= odhcp6c_get_state(state
, &len
);
772 for (struct odhcp6c_entry
*c
= (struct odhcp6c_entry
*)start
;
773 (uint8_t*)c
< &start
[len
] &&
774 (uint8_t*)odhcp6c_next_entry(c
) <= &start
[len
];
775 c
= odhcp6c_next_entry(c
)) {
776 if (!memcmp(c
, new, cmplen
) && !memcmp(c
->auxtarget
, new->auxtarget
, new->auxlen
))
783 bool odhcp6c_update_entry(enum odhcp6c_state state
, struct odhcp6c_entry
*new,
784 uint32_t safe
, unsigned int holdoff_interval
)
786 struct odhcp6c_entry
*x
= odhcp6c_find_entry(state
, new);
788 if (x
&& x
->valid
> new->valid
&& new->valid
< safe
)
792 if (holdoff_interval
&& new->valid
>= x
->valid
&&
793 new->valid
!= UINT32_MAX
&&
794 new->valid
- x
->valid
< holdoff_interval
&&
795 new->preferred
>= x
->preferred
&&
796 new->preferred
!= UINT32_MAX
&&
797 new->preferred
- x
->preferred
< holdoff_interval
)
800 x
->valid
= new->valid
;
801 x
->preferred
= new->preferred
;
805 } else if (odhcp6c_add_state(state
, new, odhcp6c_entry_size(new)))
811 static void odhcp6c_expire_list(enum odhcp6c_state state
, uint32_t elapsed
, bool remove_expired
)
814 uint8_t *start
= odhcp6c_get_state(state
, &len
);
816 for (struct odhcp6c_entry
*c
= (struct odhcp6c_entry
*)start
;
817 (uint8_t*)c
< &start
[len
] &&
818 (uint8_t*)odhcp6c_next_entry(c
) <= &start
[len
];
822 else if (c
->t1
!= UINT32_MAX
)
827 else if (c
->t2
!= UINT32_MAX
)
830 if (c
->preferred
< elapsed
)
832 else if (c
->preferred
!= UINT32_MAX
)
833 c
->preferred
-= elapsed
;
835 if (c
->valid
< elapsed
)
837 else if (c
->valid
!= UINT32_MAX
)
840 if (!c
->valid
&& remove_expired
) {
841 odhcp6c_remove_state(state
, ((uint8_t*)c
) - start
, odhcp6c_entry_size(c
));
842 start
= odhcp6c_get_state(state
, &len
);
844 c
= odhcp6c_next_entry(c
);
848 static uint8_t *odhcp6c_state_find_opt(const uint16_t code
)
851 uint8_t *odata
, *opts
= odhcp6c_get_state(STATE_OPTS
, &opts_len
);
852 uint16_t otype
, olen
;
854 dhcpv6_for_each_option(opts
, &opts
[opts_len
], otype
, olen
, odata
) {
862 void odhcp6c_expire(bool expire_ia_pd
)
864 time_t now
= odhcp6c_get_milli_time() / 1000;
865 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
869 odhcp6c_expire_list(STATE_RA_PREFIX
, elapsed
, true);
870 odhcp6c_expire_list(STATE_RA_ROUTE
, elapsed
, true);
871 odhcp6c_expire_list(STATE_RA_DNS
, elapsed
, true);
872 odhcp6c_expire_list(STATE_RA_SEARCH
, elapsed
, true);
873 odhcp6c_expire_list(STATE_IA_NA
, elapsed
, true);
874 odhcp6c_expire_list(STATE_IA_PD
, elapsed
, expire_ia_pd
);
877 uint32_t odhcp6c_elapsed(void)
879 return odhcp6c_get_milli_time() / 1000 - last_update
;
882 int odhcp6c_random(void *buf
, size_t len
)
884 return read(urandom_fd
, buf
, len
);
887 bool odhcp6c_is_bound(void)
892 bool odhcp6c_addr_in_scope(const struct in6_addr
*addr
)
894 FILE *fd
= fopen("/proc/net/if_inet6", "r");
902 while (fgets(buf
, sizeof(buf
), fd
)) {
903 struct in6_addr inet6_addr
;
904 uint32_t flags
, dummy
;
906 char name
[IF_NAMESIZE
], addr_buf
[33];
910 if ((len
<= 0) || buf
[len
- 1] != '\n')
915 if (sscanf(buf
, "%s %x %x %x %x %s",
916 addr_buf
, &dummy
, &dummy
, &dummy
, &flags
, name
) != 6)
919 if (strcmp(name
, ifname
) ||
920 (flags
& (IFA_F_DADFAILED
| IFA_F_TENTATIVE
| IFA_F_DEPRECATED
)))
923 for (i
= 0; i
< strlen(addr_buf
); i
++) {
924 if (!isxdigit(addr_buf
[i
]) || isupper(addr_buf
[i
]))
928 memset(&inet6_addr
, 0, sizeof(inet6_addr
));
929 for (i
= 0; i
< (strlen(addr_buf
) / 2); i
++) {
931 static const char hex
[] = "0123456789abcdef";
932 byte
= ((index(hex
, addr_buf
[i
* 2]) - hex
) << 4) |
933 (index(hex
, addr_buf
[i
* 2 + 1]) - hex
);
934 inet6_addr
.s6_addr
[i
] = byte
;
937 if ((IN6_IS_ADDR_LINKLOCAL(&inet6_addr
) == IN6_IS_ADDR_LINKLOCAL(addr
)) &&
938 (IN6_IS_ADDR_UNIQUELOCAL(&inet6_addr
) == IN6_IS_ADDR_UNIQUELOCAL(addr
))) {
948 static void sighandler(int signal
)
950 if (signal
== SIGUSR1
)
952 else if (signal
== SIGUSR2
)
954 else if (signal
== SIGIO
)
960 static int add_opt(const uint16_t code
, const uint8_t *data
, const uint16_t len
)
965 } opt_hdr
= { htons(code
), htons(len
) };
967 if (odhcp6c_state_find_opt(code
))
970 if (odhcp6c_add_state(STATE_OPTS
, &opt_hdr
, sizeof(opt_hdr
)) ||
971 odhcp6c_add_state(STATE_OPTS
, data
, len
)) {
972 syslog(LOG_ERR
, "Failed to add option %hu", code
);
979 struct odhcp6c_opt
*odhcp6c_find_opt(const uint16_t code
)
981 struct odhcp6c_opt
*opt
= opts
;
984 if (opt
->code
== code
)
993 static struct odhcp6c_opt
*odhcp6c_find_opt_by_name(const char *name
)
995 struct odhcp6c_opt
*opt
= opts
;
997 if (!name
|| !strlen(name
))
1000 while (opt
->code
&& (!opt
->str
|| strcmp(opt
->str
, name
)))
1003 return (opt
->code
> 0 ? opt
: NULL
);
1006 static int parse_opt_u8(const char *src
, uint8_t **dst
)
1008 int len
= strlen(src
);
1010 *dst
= realloc(*dst
, len
/2);
1014 return script_unhexlify(*dst
, len
, src
);
1017 static int parse_opt_string(const char *src
, uint8_t **dst
, const bool array
)
1020 char *sep
= strpbrk(src
, ARRAY_SEP
);
1031 int len
= strlen(src
);
1033 *dst
= realloc(*dst
, o_len
+ len
);
1037 memcpy(&((*dst
)[o_len
]), src
, len
);
1043 sep
= strpbrk(src
, ARRAY_SEP
);
1049 static int parse_opt_dns_string(const char *src
, uint8_t **dst
, const bool array
)
1052 char *sep
= strpbrk(src
, ARRAY_SEP
);
1065 int len
= dn_comp(src
, tmp
, sizeof(tmp
), NULL
, NULL
);
1069 *dst
= realloc(*dst
, o_len
+ len
);
1073 memcpy(&((*dst
)[o_len
]), tmp
, len
);
1079 sep
= strpbrk(src
, ARRAY_SEP
);
1085 static int parse_opt_ip6(const char *src
, uint8_t **dst
, const bool array
)
1088 char *sep
= strpbrk(src
, ARRAY_SEP
);
1094 int len
= sizeof(struct in6_addr
);
1101 *dst
= realloc(*dst
, o_len
+ len
);
1105 if (inet_pton(AF_INET6
, src
, &((*dst
)[o_len
])) < 1)
1112 sep
= strpbrk(src
, ARRAY_SEP
);
1118 static int parse_opt_user_class(const char *src
, uint8_t **dst
, const bool array
)
1121 char *sep
= strpbrk(src
, ARRAY_SEP
);
1131 uint16_t str_len
= strlen(src
);
1133 *dst
= realloc(*dst
, o_len
+ str_len
+ 2);
1140 } *e
= (struct user_class
*)&((*dst
)[o_len
]);
1142 e
->len
= ntohs(str_len
);
1143 memcpy(e
->data
, src
, str_len
);
1145 o_len
+= str_len
+ 2;
1149 sep
= strpbrk(src
, ARRAY_SEP
);
1155 static int parse_opt_data(const char *data
, uint8_t **dst
, const unsigned int type
,
1162 ret
= parse_opt_u8(data
, dst
);
1166 ret
= parse_opt_string(data
, dst
, array
);
1170 ret
= parse_opt_dns_string(data
, dst
, array
);
1174 ret
= parse_opt_ip6(data
, dst
, array
);
1177 case OPT_USER_CLASS
:
1178 ret
= parse_opt_user_class(data
, dst
, array
);
1189 static int parse_opt(const char *opt
)
1193 uint8_t *payload
= NULL
;
1195 unsigned int type
= OPT_U8
;
1197 struct odhcp6c_opt
*dopt
= NULL
;
1200 data
= strpbrk(opt
, ":");
1207 if (strlen(opt
) == 0 || strlen(data
) == 0)
1210 dopt
= odhcp6c_find_opt_by_name(opt
);
1213 optn
= strtoul(opt
, &e
, 0);
1214 if (*e
|| e
== opt
|| optn
> USHRT_MAX
)
1217 dopt
= odhcp6c_find_opt(optn
);
1221 /* Check if the type for the content is well-known */
1223 /* Refuse internal options */
1224 if (dopt
->flags
& OPT_INTERNAL
)
1227 type
= dopt
->flags
& OPT_MASK_SIZE
;
1228 array
= ((dopt
->flags
& OPT_ARRAY
) == OPT_ARRAY
) ? true : false;
1229 } else if (data
[0] == '"' || data
[0] == '\'') {
1230 char *end
= strrchr(data
+ 1, data
[0]);
1232 if (end
&& (end
== (data
+ strlen(data
) - 1))) {
1233 /* Raw option is specified as a string */
1241 payload_len
= parse_opt_data(data
, &payload
, type
, array
);
1242 if (payload_len
> 0)
1243 ret
= add_opt(optn
, payload
, payload_len
);