2 * Copyright (C) 2012-2014 Steven Barth <steven@midlink.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License v2 as published by
6 * the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
24 #include <arpa/inet.h>
26 #include <netinet/in.h>
30 static const char hexdigits
[] = "0123456789abcdef";
31 static const int8_t hexvals
[] = {
32 -1, -1, -1, -1, -1, -1, -1, -1, -1, -2, -2, -1, -1, -2, -1, -1,
33 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
34 -2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
35 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
36 -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
37 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
38 -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
39 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
43 static char action
[16] = "";
44 static char *argv
[4] = {NULL
, NULL
, action
, NULL
};
45 static volatile pid_t running
= 0;
46 static time_t started
;
49 static void script_sighandle(int signal
)
51 if (signal
== SIGCHLD
) {
53 while ((child
= waitpid(-1, NULL
, WNOHANG
)) > 0)
59 int script_init(const char *path
, const char *ifname
)
61 argv
[0] = (char*)path
;
62 argv
[1] = (char*)ifname
;
63 signal(SIGCHLD
, script_sighandle
);
68 ssize_t
script_unhexlify(uint8_t *dst
, size_t len
, const char *src
)
71 for (c
= 0; c
< len
&& src
[0] && src
[1]; ++c
) {
72 int8_t x
= (int8_t)*src
++;
73 int8_t y
= (int8_t)*src
++;
74 if (x
< 0 || (x
= hexvals
[x
]) < 0
75 || y
< 0 || (y
= hexvals
[y
]) < 0)
78 while (((int8_t)*src
) < 0 ||
79 (*src
&& hexvals
[(uint8_t)*src
] < 0))
87 static void script_hexlify(char *dst
, const uint8_t *src
, size_t len
) {
88 for (size_t i
= 0; i
< len
; ++i
) {
89 *dst
++ = hexdigits
[src
[i
] >> 4];
90 *dst
++ = hexdigits
[src
[i
] & 0x0f];
96 static void ipv6_to_env(const char *name
,
97 const struct in6_addr
*addr
, size_t cnt
)
99 size_t buf_len
= strlen(name
);
100 char *buf
= realloc(NULL
, cnt
* INET6_ADDRSTRLEN
+ buf_len
+ 2);
101 memcpy(buf
, name
, buf_len
);
102 buf
[buf_len
++] = '=';
103 for (size_t i
= 0; i
< cnt
; ++i
) {
104 inet_ntop(AF_INET6
, &addr
[i
], &buf
[buf_len
], INET6_ADDRSTRLEN
);
105 buf_len
+= strlen(&buf
[buf_len
]);
106 buf
[buf_len
++] = ' ';
108 buf
[buf_len
- 1] = '\0';
113 static void fqdn_to_env(const char *name
, const uint8_t *fqdn
, size_t len
)
115 size_t buf_len
= strlen(name
);
116 size_t buf_size
= len
+ buf_len
+ 2;
117 const uint8_t *fqdn_end
= fqdn
+ len
;
118 char *buf
= realloc(NULL
, len
+ buf_len
+ 2);
119 memcpy(buf
, name
, buf_len
);
120 buf
[buf_len
++] = '=';
121 while (fqdn
< fqdn_end
) {
122 int l
= dn_expand(fqdn
, fqdn_end
, fqdn
, &buf
[buf_len
], buf_size
- buf_len
);
126 buf_len
+= strlen(&buf
[buf_len
]);
127 buf
[buf_len
++] = ' ';
129 buf
[buf_len
- 1] = '\0';
133 static void bin_to_env(uint8_t *opts
, size_t len
)
135 uint8_t *oend
= opts
+ len
, *odata
;
136 uint16_t otype
, olen
;
137 dhcpv6_for_each_option(opts
, oend
, otype
, olen
, odata
) {
138 char *buf
= realloc(NULL
, 14 + (olen
* 2));
141 snprintf(buf
, 14, "OPTION_%hu=", otype
);
142 buf_len
+= strlen(buf
);
144 script_hexlify(&buf
[buf_len
], odata
, olen
);
156 static void entry_to_env(const char *name
, const void *data
, size_t len
, enum entry_type type
)
158 size_t buf_len
= strlen(name
);
159 const struct odhcp6c_entry
*e
= data
;
160 // Worst case: ENTRY_PREFIX with iaid != 1 and exclusion
161 const size_t max_entry_len
= (INET6_ADDRSTRLEN
-1 + 5 + 22 + 15 + 10 +
162 INET6_ADDRSTRLEN
-1 + 11 + 1);
163 char *buf
= realloc(NULL
, buf_len
+ 2 + (len
/ sizeof(*e
)) * max_entry_len
);
164 memcpy(buf
, name
, buf_len
);
165 buf
[buf_len
++] = '=';
167 for (size_t i
= 0; i
< len
/ sizeof(*e
); ++i
) {
168 inet_ntop(AF_INET6
, &e
[i
].target
, &buf
[buf_len
], INET6_ADDRSTRLEN
);
169 buf_len
+= strlen(&buf
[buf_len
]);
170 if (type
!= ENTRY_HOST
) {
171 snprintf(&buf
[buf_len
], 6, "/%"PRIu16
, e
[i
].length
);
172 buf_len
+= strlen(&buf
[buf_len
]);
173 if (type
== ENTRY_ROUTE
) {
174 buf
[buf_len
++] = ',';
175 if (!IN6_IS_ADDR_UNSPECIFIED(&e
[i
].router
)) {
176 inet_ntop(AF_INET6
, &e
[i
].router
, &buf
[buf_len
], INET6_ADDRSTRLEN
);
177 buf_len
+= strlen(&buf
[buf_len
]);
179 snprintf(&buf
[buf_len
], 23, ",%u,%u", e
[i
].valid
, e
[i
].priority
);
180 buf_len
+= strlen(&buf
[buf_len
]);
182 snprintf(&buf
[buf_len
], 23, ",%u,%u", e
[i
].preferred
, e
[i
].valid
);
183 buf_len
+= strlen(&buf
[buf_len
]);
186 if (type
== ENTRY_PREFIX
&& ntohl(e
[i
].iaid
) != 1) {
187 snprintf(&buf
[buf_len
], 16, ",class=%08x", ntohl(e
[i
].iaid
));
188 buf_len
+= strlen(&buf
[buf_len
]);
191 if (type
== ENTRY_PREFIX
&& e
[i
].priority
) {
192 // priority and router are abused for prefix exclusion
193 snprintf(&buf
[buf_len
], 11, ",excluded=");
194 buf_len
+= strlen(&buf
[buf_len
]);
195 inet_ntop(AF_INET6
, &e
[i
].router
, &buf
[buf_len
], INET6_ADDRSTRLEN
);
196 buf_len
+= strlen(&buf
[buf_len
]);
197 snprintf(&buf
[buf_len
], 12, "/%u", e
[i
].priority
);
198 buf_len
+= strlen(&buf
[buf_len
]);
201 buf
[buf_len
++] = ' ';
204 buf
[buf_len
- 1] = '\0';
209 static void search_to_env(const char *name
, const uint8_t *start
, size_t len
)
211 size_t buf_len
= strlen(name
);
212 char *buf
= realloc(NULL
, buf_len
+ 2 + len
);
213 char *c
= mempcpy(buf
, name
, buf_len
);
216 for (struct odhcp6c_entry
*e
= (struct odhcp6c_entry
*)start
;
217 (uint8_t*)e
< &start
[len
] && &e
->auxtarget
[e
->auxlen
] <= &start
[len
];
218 e
= (struct odhcp6c_entry
*)(&e
->auxtarget
[e
->auxlen
])) {
219 c
= mempcpy(c
, e
->auxtarget
, e
->auxlen
);
228 static void int_to_env(const char *name
, int value
)
230 size_t len
= 13 + strlen(name
);
231 char *buf
= realloc(NULL
, len
);
232 snprintf(buf
, len
, "%s=%d", name
, value
);
237 static void s46_to_env_portparams(const uint8_t *data
, size_t len
, FILE *fp
)
240 uint16_t otype
, olen
;
241 dhcpv6_for_each_option(data
, &data
[len
], otype
, olen
, odata
) {
242 if (otype
== DHCPV6_OPT_S46_PORTPARAMS
&&
243 olen
== sizeof(struct dhcpv6_s46_portparams
)) {
244 struct dhcpv6_s46_portparams
*params
= (void*)odata
;
245 fprintf(fp
, "offset=%d,psidlen=%d,psid=%d,",
246 params
->offset
, params
->psid_len
, ntohs(params
->psid
));
252 static void s46_to_env(enum odhcp6c_state state
, const uint8_t *data
, size_t len
)
254 const char *name
= (state
== STATE_S46_MAPE
) ? "MAPE" :
255 (state
== STATE_S46_MAPT
) ? "MAPT" : "LW4O6";
263 FILE *fp
= open_memstream(&str
, &strsize
);
267 const char *type
= (state
== STATE_S46_MAPE
) ? "map-e" :
268 (state
== STATE_S46_MAPT
) ? "map-t" : "lw4o6";
271 uint16_t otype
, olen
;
272 dhcpv6_for_each_option(data
, &data
[len
], otype
, olen
, odata
) {
273 struct dhcpv6_s46_rule
*rule
= (struct dhcpv6_s46_rule
*)odata
;
274 struct dhcpv6_s46_v4v6bind
*bind
= (struct dhcpv6_s46_v4v6bind
*)odata
;
276 if (state
!= STATE_S46_LW
&& otype
== DHCPV6_OPT_S46_RULE
&&
277 olen
>= sizeof(struct dhcpv6_s46_rule
)) {
278 char buf4
[INET_ADDRSTRLEN
];
279 char buf6
[INET6_ADDRSTRLEN
];
280 struct in6_addr in6
= IN6ADDR_ANY_INIT
;
282 size_t prefix6len
= rule
->prefix6_len
;
283 prefix6len
= (prefix6len
% 8 == 0) ? prefix6len
/ 8 : prefix6len
/ 8 + 1;
285 if (prefix6len
> sizeof(in6
) ||
286 olen
< sizeof(struct dhcpv6_s46_rule
) + prefix6len
)
289 memcpy(&in6
, rule
->ipv6_prefix
, prefix6len
);
291 inet_ntop(AF_INET
, &rule
->ipv4_prefix
, buf4
, sizeof(buf4
));
292 inet_ntop(AF_INET6
, &in6
, buf6
, sizeof(buf6
));
297 fprintf(fp
, "type=%s,ealen=%d,prefix4len=%d,prefix6len=%d,ipv4prefix=%s,ipv6prefix=%s,",
298 type
, rule
->ea_len
, rule
->prefix4_len
, rule
->prefix6_len
, buf4
, buf6
);
300 s46_to_env_portparams(&rule
->ipv6_prefix
[prefix6len
],
301 olen
- sizeof(*rule
) - prefix6len
, fp
);
303 dhcpv6_for_each_option(data
, &data
[len
], otype
, olen
, odata
) {
304 if (state
!= STATE_S46_MAPT
&& otype
== DHCPV6_OPT_S46_BR
&&
305 olen
== sizeof(struct in6_addr
)) {
306 inet_ntop(AF_INET6
, odata
, buf6
, sizeof(buf6
));
307 fprintf(fp
, "br=%s,", buf6
);
308 } else if (state
== STATE_S46_MAPT
&& otype
== DHCPV6_OPT_S46_DMR
&&
309 olen
>= sizeof(struct dhcpv6_s46_dmr
)) {
310 struct dhcpv6_s46_dmr
*dmr
= (struct dhcpv6_s46_dmr
*)odata
;
311 memset(&in6
, 0, sizeof(in6
));
312 size_t prefix6len
= dmr
->dmr_prefix6_len
;
313 prefix6len
= (prefix6len
% 8 == 0) ? prefix6len
/ 8 : prefix6len
/ 8 + 1;
315 if (prefix6len
> sizeof(in6
) ||
316 olen
< sizeof(struct dhcpv6_s46_dmr
) + prefix6len
)
319 memcpy(&in6
, dmr
->dmr_ipv6_prefix
, prefix6len
);
320 inet_ntop(AF_INET6
, &in6
, buf6
, sizeof(buf6
));
321 fprintf(fp
, "dmr=%s/%d,", buf6
, dmr
->dmr_prefix6_len
);
326 } else if (state
== STATE_S46_LW
&& otype
== DHCPV6_OPT_S46_V4V6BIND
&&
327 olen
>= sizeof(struct dhcpv6_s46_v4v6bind
)) {
328 char buf4
[INET_ADDRSTRLEN
];
329 char buf6
[INET6_ADDRSTRLEN
];
330 struct in6_addr in6
= IN6ADDR_ANY_INIT
;
332 size_t prefix6len
= bind
->bindprefix6_len
;
333 prefix6len
= (prefix6len
% 8 == 0) ? prefix6len
/ 8 : prefix6len
/ 8 + 1;
335 if (prefix6len
> sizeof(in6
) ||
336 olen
< sizeof(struct dhcpv6_s46_v4v6bind
) + prefix6len
)
339 memcpy(&in6
, bind
->bind_ipv6_prefix
, prefix6len
);
341 inet_ntop(AF_INET
, &bind
->ipv4_address
, buf4
, sizeof(buf4
));
342 inet_ntop(AF_INET6
, &in6
, buf6
, sizeof(buf6
));
344 fprintf(fp
, "type=%s,prefix4len=32,prefix6len=%d,ipv4prefix=%s,ipv6prefix=%s,",
345 type
, bind
->bindprefix6_len
, buf4
, buf6
);
347 s46_to_env_portparams(&bind
->bind_ipv6_prefix
[prefix6len
],
348 olen
- sizeof(*bind
) - prefix6len
, fp
);
350 dhcpv6_for_each_option(data
, &data
[len
], otype
, olen
, odata
) {
351 if (otype
== DHCPV6_OPT_S46_BR
&& olen
== sizeof(struct in6_addr
)) {
352 inet_ntop(AF_INET6
, odata
, buf6
, sizeof(buf6
));
353 fprintf(fp
, "br=%s,", buf6
);
366 void script_call(const char *status
, int delay
, bool resume
)
368 time_t now
= odhcp6c_get_milli_time() / 1000;
369 bool running_script
= false;
372 kill(running
, SIGTERM
);
373 delay
-= now
- started
;
374 running_script
= true;
377 if (resume
|| !running_script
|| !action
[0])
378 strncpy(action
, status
, sizeof(action
) - 1);
387 } else if (pid
== 0) {
388 size_t dns_len
, search_len
, custom_len
, sntp_ip_len
, ntp_ip_len
, ntp_dns_len
;
389 size_t sip_ip_len
, sip_fqdn_len
, aftr_name_len
, cer_len
, addr_len
;
390 size_t s46_mapt_len
, s46_mape_len
, s46_lw_len
, passthru_len
;
392 signal(SIGTERM
, SIG_DFL
);
398 struct in6_addr
*addr
= odhcp6c_get_state(STATE_SERVER_ADDR
, &addr_len
);
399 struct in6_addr
*dns
= odhcp6c_get_state(STATE_DNS
, &dns_len
);
400 uint8_t *search
= odhcp6c_get_state(STATE_SEARCH
, &search_len
);
401 uint8_t *custom
= odhcp6c_get_state(STATE_CUSTOM_OPTS
, &custom_len
);
402 struct in6_addr
*sntp
= odhcp6c_get_state(STATE_SNTP_IP
, &sntp_ip_len
);
403 struct in6_addr
*ntp
= odhcp6c_get_state(STATE_NTP_IP
, &ntp_ip_len
);
404 uint8_t *ntp_dns
= odhcp6c_get_state(STATE_NTP_FQDN
, &ntp_dns_len
);
405 struct in6_addr
*sip
= odhcp6c_get_state(STATE_SIP_IP
, &sip_ip_len
);
406 uint8_t *sip_fqdn
= odhcp6c_get_state(STATE_SIP_FQDN
, &sip_fqdn_len
);
407 uint8_t *aftr_name
= odhcp6c_get_state(STATE_AFTR_NAME
, &aftr_name_len
);
408 struct in6_addr
*cer
= odhcp6c_get_state(STATE_CER
, &cer_len
);
409 uint8_t *s46_mapt
= odhcp6c_get_state(STATE_S46_MAPT
, &s46_mapt_len
);
410 uint8_t *s46_mape
= odhcp6c_get_state(STATE_S46_MAPE
, &s46_mape_len
);
411 uint8_t *s46_lw
= odhcp6c_get_state(STATE_S46_LW
, &s46_lw_len
);
412 uint8_t *passthru
= odhcp6c_get_state(STATE_PASSTHRU
, &passthru_len
);
414 size_t prefix_len
, address_len
, ra_pref_len
,
415 ra_route_len
, ra_dns_len
, ra_search_len
;
416 uint8_t *prefix
= odhcp6c_get_state(STATE_IA_PD
, &prefix_len
);
417 uint8_t *address
= odhcp6c_get_state(STATE_IA_NA
, &address_len
);
418 uint8_t *ra_pref
= odhcp6c_get_state(STATE_RA_PREFIX
, &ra_pref_len
);
419 uint8_t *ra_route
= odhcp6c_get_state(STATE_RA_ROUTE
, &ra_route_len
);
420 uint8_t *ra_dns
= odhcp6c_get_state(STATE_RA_DNS
, &ra_dns_len
);
421 uint8_t *ra_search
= odhcp6c_get_state(STATE_RA_SEARCH
, &ra_search_len
);
423 ipv6_to_env("SERVER", addr
, addr_len
/ sizeof(*addr
));
424 ipv6_to_env("RDNSS", dns
, dns_len
/ sizeof(*dns
));
425 ipv6_to_env("SNTP_IP", sntp
, sntp_ip_len
/ sizeof(*sntp
));
426 ipv6_to_env("NTP_IP", ntp
, ntp_ip_len
/ sizeof(*ntp
));
427 fqdn_to_env("NTP_FQDN", ntp_dns
, ntp_dns_len
);
428 ipv6_to_env("SIP_IP", sip
, sip_ip_len
/ sizeof(*sip
));
429 fqdn_to_env("DOMAINS", search
, search_len
);
430 fqdn_to_env("SIP_DOMAIN", sip_fqdn
, sip_fqdn_len
);
431 fqdn_to_env("AFTR", aftr_name
, aftr_name_len
);
432 ipv6_to_env("CER", cer
, cer_len
/ sizeof(*cer
));
433 s46_to_env(STATE_S46_MAPE
, s46_mape
, s46_mape_len
);
434 s46_to_env(STATE_S46_MAPT
, s46_mapt
, s46_mapt_len
);
435 s46_to_env(STATE_S46_LW
, s46_lw
, s46_lw_len
);
436 bin_to_env(custom
, custom_len
);
438 if (odhcp6c_is_bound()) {
439 entry_to_env("PREFIXES", prefix
, prefix_len
, ENTRY_PREFIX
);
440 entry_to_env("ADDRESSES", address
, address_len
, ENTRY_ADDRESS
);
443 entry_to_env("RA_ADDRESSES", ra_pref
, ra_pref_len
, ENTRY_ADDRESS
);
444 entry_to_env("RA_ROUTES", ra_route
, ra_route_len
, ENTRY_ROUTE
);
445 entry_to_env("RA_DNS", ra_dns
, ra_dns_len
, ENTRY_HOST
);
446 search_to_env("RA_DOMAINS", ra_search
, ra_search_len
);
448 int_to_env("RA_HOPLIMIT", ra_conf_hoplimit(0));
449 int_to_env("RA_MTU", ra_conf_mtu(0));
450 int_to_env("RA_REACHABLE", ra_conf_reachable(0));
451 int_to_env("RA_RETRANSMIT", ra_conf_retransmit(0));
453 char *buf
= malloc(10 + passthru_len
* 2);
454 strncpy(buf
, "PASSTHRU=", 10);
455 script_hexlify(&buf
[9], passthru
, passthru_len
);
458 execv(argv
[0], argv
);