9d88daf43676054a4c415b917b8f8a7931d38452
2 * Copyright (C) 2012-2013 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.
23 #include <arpa/inet.h>
24 #include <netinet/in.h>
28 static const char hexdigits
[] = "0123456789abcdef";
29 static const int8_t hexvals
[] = {
30 -1, -1, -1, -1, -1, -1, -1, -1, -1, -2, -2, -1, -1, -2, -1, -1,
31 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
32 -2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
33 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
34 -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
35 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -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,
42 static char *argv
[4] = {NULL
, NULL
, NULL
, NULL
};
43 static volatile char *delayed_call
= NULL
;
46 int script_init(const char *path
, const char *ifname
)
48 argv
[0] = (char*)path
;
49 argv
[1] = (char*)ifname
;
54 ssize_t
script_unhexlify(uint8_t *dst
, size_t len
, const char *src
)
57 for (c
= 0; c
< len
&& src
[0] && src
[1]; ++c
) {
58 int8_t x
= (int8_t)*src
++;
59 int8_t y
= (int8_t)*src
++;
60 if (x
< 0 || (x
= hexvals
[x
]) < 0
61 || y
< 0 || (y
= hexvals
[y
]) < 0)
64 while (((int8_t)*src
) < 0 ||
65 (*src
&& hexvals
[(uint8_t)*src
] < 0))
73 static void script_hexlify(char *dst
, const uint8_t *src
, size_t len
) {
74 for (size_t i
= 0; i
< len
; ++i
) {
75 *dst
++ = hexdigits
[src
[i
] >> 4];
76 *dst
++ = hexdigits
[src
[i
] & 0x0f];
82 static void ipv6_to_env(const char *name
,
83 const struct in6_addr
*addr
, size_t cnt
)
85 size_t buf_len
= strlen(name
);
86 char *buf
= realloc(NULL
, cnt
* INET6_ADDRSTRLEN
+ buf_len
+ 2);
87 memcpy(buf
, name
, buf_len
);
89 for (size_t i
= 0; i
< cnt
; ++i
) {
90 inet_ntop(AF_INET6
, &addr
[i
], &buf
[buf_len
], INET6_ADDRSTRLEN
);
91 buf_len
+= strlen(&buf
[buf_len
]);
94 buf
[buf_len
- 1] = '\0';
99 static void fqdn_to_env(const char *name
, const uint8_t *fqdn
, size_t len
)
101 size_t buf_len
= strlen(name
);
102 size_t buf_size
= len
+ buf_len
+ 2;
103 const uint8_t *fqdn_end
= fqdn
+ len
;
104 char *buf
= realloc(NULL
, len
+ buf_len
+ 2);
105 memcpy(buf
, name
, buf_len
);
106 buf
[buf_len
++] = '=';
108 while (l
> 0 && fqdn
< fqdn_end
) {
109 l
= dn_expand(fqdn
, fqdn_end
, fqdn
, &buf
[buf_len
], buf_size
- buf_len
);
111 buf_len
+= strlen(&buf
[buf_len
]);
112 buf
[buf_len
++] = ' ';
114 buf
[buf_len
- 1] = '\0';
119 static void fqdn_to_ip_env(const char *name
, const uint8_t *fqdn
, size_t len
)
121 size_t buf_len
= strlen(name
);
122 char *buf
= realloc(NULL
, INET6_ADDRSTRLEN
+ buf_len
+ 3);
123 memcpy(buf
, name
, buf_len
);
124 buf
[buf_len
++] = '=';
127 if (dn_expand(fqdn
, fqdn
+ len
, fqdn
, namebuf
, sizeof(namebuf
)) <= 0)
130 struct addrinfo hints
= {.ai_family
= AF_INET6
}, *r
;
131 if (getaddrinfo(namebuf
, NULL
, &hints
, &r
))
134 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)r
->ai_addr
;
135 inet_ntop(AF_INET6
, &sin6
->sin6_addr
, &buf
[buf_len
], INET6_ADDRSTRLEN
);
142 static void bin_to_env(uint8_t *opts
, size_t len
)
144 uint8_t *oend
= opts
+ len
, *odata
;
145 uint16_t otype
, olen
;
146 dhcpv6_for_each_option(opts
, oend
, otype
, olen
, odata
) {
147 char *buf
= realloc(NULL
, 14 + (olen
* 2));
150 snprintf(buf
, 14, "OPTION_%hu=", otype
);
151 buf_len
+= strlen(buf
);
153 script_hexlify(&buf
[buf_len
], odata
, olen
);
165 static void entry_to_env(const char *name
, const void *data
, size_t len
, enum entry_type type
)
167 size_t buf_len
= strlen(name
);
168 const struct odhcp6c_entry
*e
= data
;
169 char *buf
= realloc(NULL
, buf_len
+ 2 + (len
/ sizeof(*e
)) * 144);
170 memcpy(buf
, name
, buf_len
);
171 buf
[buf_len
++] = '=';
173 for (size_t i
= 0; i
< len
/ sizeof(*e
); ++i
) {
174 inet_ntop(AF_INET6
, &e
[i
].target
, &buf
[buf_len
], INET6_ADDRSTRLEN
);
175 buf_len
+= strlen(&buf
[buf_len
]);
176 if (type
!= ENTRY_HOST
) {
177 buf_len
+= snprintf(&buf
[buf_len
], 6, "/%hhu", e
[i
].length
);
178 if (type
== ENTRY_ROUTE
) {
179 buf
[buf_len
++] = ',';
180 if (!IN6_IS_ADDR_UNSPECIFIED(&e
[i
].router
)) {
181 inet_ntop(AF_INET6
, &e
[i
].router
, &buf
[buf_len
], INET6_ADDRSTRLEN
);
182 buf_len
+= strlen(&buf
[buf_len
]);
184 buf_len
+= snprintf(&buf
[buf_len
], 24, ",%u", e
[i
].valid
);
185 buf_len
+= snprintf(&buf
[buf_len
], 12, ",%u", e
[i
].priority
);
187 buf_len
+= snprintf(&buf
[buf_len
], 24, ",%u,%u", e
[i
].preferred
, e
[i
].valid
);
190 if (type
== ENTRY_PREFIX
&& e
[i
].priority
) {
191 // priority and router are abused for prefix exclusion
192 buf_len
+= snprintf(&buf
[buf_len
], 12, ",excluded=");
193 inet_ntop(AF_INET6
, &e
[i
].router
, &buf
[buf_len
], INET6_ADDRSTRLEN
);
194 buf_len
+= strlen(&buf
[buf_len
]);
195 buf_len
+= snprintf(&buf
[buf_len
], 24, "/%u", e
[i
].priority
);
198 buf
[buf_len
++] = ' ';
201 buf
[buf_len
- 1] = '\0';
206 static void script_call_delayed(int signal
__attribute__((unused
)))
209 script_call((char*)delayed_call
);
213 void script_delay_call(const char *status
, int timeout
)
216 delayed_call
= strdup(status
);
217 signal(SIGALRM
, script_call_delayed
);
223 void script_call(const char *status
)
225 size_t dns_len
, search_len
, custom_len
, sntp_ip_len
, sntp_dns_len
;
226 size_t sip_ip_len
, sip_fqdn_len
, aftr_name_len
;
232 struct in6_addr
*dns
= odhcp6c_get_state(STATE_DNS
, &dns_len
);
233 uint8_t *search
= odhcp6c_get_state(STATE_SEARCH
, &search_len
);
234 uint8_t *custom
= odhcp6c_get_state(STATE_CUSTOM_OPTS
, &custom_len
);
235 struct in6_addr
*sntp
= odhcp6c_get_state(STATE_SNTP_IP
, &sntp_ip_len
);
236 uint8_t *sntp_dns
= odhcp6c_get_state(STATE_SNTP_FQDN
, &sntp_dns_len
);
237 struct in6_addr
*sip
= odhcp6c_get_state(STATE_SIP_IP
, &sip_ip_len
);
238 uint8_t *sip_fqdn
= odhcp6c_get_state(STATE_SIP_FQDN
, &sip_fqdn_len
);
239 uint8_t *aftr_name
= odhcp6c_get_state(STATE_AFTR_NAME
, &aftr_name_len
);
241 size_t prefix_len
, address_len
, ra_pref_len
, ra_route_len
, ra_dns_len
;
242 uint8_t *prefix
= odhcp6c_get_state(STATE_IA_PD
, &prefix_len
);
243 uint8_t *address
= odhcp6c_get_state(STATE_IA_NA
, &address_len
);
244 uint8_t *ra_pref
= odhcp6c_get_state(STATE_RA_PREFIX
, &ra_pref_len
);
245 uint8_t *ra_route
= odhcp6c_get_state(STATE_RA_ROUTE
, &ra_route_len
);
246 uint8_t *ra_dns
= odhcp6c_get_state(STATE_RA_DNS
, &ra_dns_len
);
248 // Don't set environment before forking, because env is leaky.
250 ipv6_to_env("RDNSS", dns
, dns_len
/ sizeof(*dns
));
251 ipv6_to_env("SNTP_IP", sntp
, sntp_ip_len
/ sizeof(*sntp
));
252 ipv6_to_env("SIP_IP", sip
, sip_ip_len
/ sizeof(*sip
));
253 fqdn_to_env("DOMAINS", search
, search_len
);
254 fqdn_to_env("SNTP_FQDN", sntp_dns
, sntp_dns_len
);
255 fqdn_to_env("SIP_DOMAIN", sip_fqdn
, sip_fqdn_len
);
256 fqdn_to_env("AFTR", aftr_name
, aftr_name_len
);
257 fqdn_to_ip_env("AFTR_IP", aftr_name
, aftr_name_len
);
258 bin_to_env(custom
, custom_len
);
259 entry_to_env("PREFIXES", prefix
, prefix_len
, ENTRY_PREFIX
);
260 entry_to_env("ADDRESSES", address
, address_len
, ENTRY_ADDRESS
);
261 entry_to_env("RA_ADDRESSES", ra_pref
, ra_pref_len
, ENTRY_ADDRESS
);
262 entry_to_env("RA_ROUTES", ra_route
, ra_route_len
, ENTRY_ROUTE
);
263 entry_to_env("RA_DNS", ra_dns
, ra_dns_len
, ENTRY_HOST
);
265 argv
[2] = (char*)status
;
266 execv(argv
[0], argv
);
270 // Delete lost prefixes and user opts
271 odhcp6c_clear_state(STATE_CUSTOM_OPTS
);