051718f206ed2e7513fbd9808d09628a2b2d17ae
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.
22 #include <arpa/inet.h>
23 #include <netinet/in.h>
27 static const char hexdigits
[] = "0123456789abcdef";
28 static const int8_t hexvals
[] = {
29 -1, -1, -1, -1, -1, -1, -1, -1, -1, -2, -2, -1, -1, -2, -1, -1,
30 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
31 -2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
32 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
33 -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
34 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
35 -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
36 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
41 static char *argv
[4] = {NULL
, NULL
, NULL
, NULL
};
42 static volatile char *delayed_call
= NULL
;
45 int script_init(const char *path
, const char *ifname
)
47 argv
[0] = (char*)path
;
48 argv
[1] = (char*)ifname
;
53 ssize_t
script_unhexlify(uint8_t *dst
, size_t len
, const char *src
)
56 for (c
= 0; c
< len
&& src
[0] && src
[1]; ++c
) {
57 int8_t x
= (int8_t)*src
++;
58 int8_t y
= (int8_t)*src
++;
59 if (x
< 0 || (x
= hexvals
[x
]) < 0
60 || y
< 0 || (y
= hexvals
[y
]) < 0)
63 while (((int8_t)*src
) < 0 ||
64 (*src
&& hexvals
[(uint8_t)*src
] < 0))
72 static void script_hexlify(char *dst
, const uint8_t *src
, size_t len
) {
73 for (size_t i
= 0; i
< len
; ++i
) {
74 *dst
++ = hexdigits
[src
[i
] >> 4];
75 *dst
++ = hexdigits
[src
[i
] & 0x0f];
81 static void ipv6_to_env(const char *name
,
82 const struct in6_addr
*addr
, size_t cnt
)
84 size_t buf_len
= strlen(name
);
85 char *buf
= realloc(NULL
, cnt
* INET6_ADDRSTRLEN
+ buf_len
+ 2);
86 memcpy(buf
, name
, buf_len
);
88 for (size_t i
= 0; i
< cnt
; ++i
) {
89 inet_ntop(AF_INET6
, &addr
[i
], &buf
[buf_len
], INET6_ADDRSTRLEN
);
90 buf_len
+= strlen(&buf
[buf_len
]);
93 buf
[buf_len
- 1] = '\0';
98 static void fqdn_to_env(const char *name
, const uint8_t *fqdn
, size_t len
)
100 size_t buf_len
= strlen(name
);
101 const uint8_t *fqdn_end
= fqdn
+ len
;
102 char *buf
= realloc(NULL
, len
+ buf_len
+ 2);
103 memcpy(buf
, name
, buf_len
);
104 buf
[buf_len
++] = '=';
106 while (l
> 0 && fqdn
< fqdn_end
) {
107 l
= dn_expand(fqdn
, &fqdn
[len
], fqdn
, &buf
[buf_len
], len
);
109 buf_len
+= strlen(&buf
[buf_len
]);
110 buf
[buf_len
++] = ' ';
112 buf
[buf_len
- 1] = '\0';
117 static void bin_to_env(uint8_t *opts
, size_t len
)
119 uint8_t *oend
= opts
+ len
, *odata
;
120 uint16_t otype
, olen
;
121 dhcpv6_for_each_option(opts
, oend
, otype
, olen
, odata
) {
122 char *buf
= realloc(NULL
, 14 + (olen
* 2));
125 snprintf(buf
, 14, "OPTION_%hu=", otype
);
126 buf_len
+= strlen(buf
);
128 script_hexlify(&buf
[buf_len
], odata
, olen
);
140 static void entry_to_env(const char *name
, const void *data
, size_t len
, enum entry_type type
)
142 size_t buf_len
= strlen(name
);
143 const struct odhcp6c_entry
*e
= data
;
144 char *buf
= realloc(NULL
, buf_len
+ 2 + (len
/ sizeof(*e
)) * 144);
145 memcpy(buf
, name
, buf_len
);
146 buf
[buf_len
++] = '=';
148 for (size_t i
= 0; i
< len
/ sizeof(*e
); ++i
) {
149 inet_ntop(AF_INET6
, &e
[i
].target
, &buf
[buf_len
], INET6_ADDRSTRLEN
);
150 buf_len
+= strlen(&buf
[buf_len
]);
151 if (type
!= ENTRY_HOST
) {
152 buf_len
+= snprintf(&buf
[buf_len
], 6, "/%hhu", e
[i
].length
);
153 if (type
== ENTRY_ROUTE
) {
154 buf
[buf_len
++] = ',';
155 if (!IN6_IS_ADDR_UNSPECIFIED(&e
[i
].router
)) {
156 inet_ntop(AF_INET6
, &e
[i
].router
, &buf
[buf_len
], INET6_ADDRSTRLEN
);
157 buf_len
+= strlen(&buf
[buf_len
]);
159 buf_len
+= snprintf(&buf
[buf_len
], 24, ",%u", e
[i
].valid
);
160 buf_len
+= snprintf(&buf
[buf_len
], 12, ",%u", e
[i
].priority
);
162 buf_len
+= snprintf(&buf
[buf_len
], 24, ",%u,%u", e
[i
].preferred
, e
[i
].valid
);
165 if (type
== ENTRY_PREFIX
&& e
[i
].priority
) {
166 // priority and router are abused for prefix exclusion
167 buf_len
+= snprintf(&buf
[buf_len
], 12, ",excluded=");
168 inet_ntop(AF_INET6
, &e
[i
].router
, &buf
[buf_len
], INET6_ADDRSTRLEN
);
169 buf_len
+= strlen(&buf
[buf_len
]);
170 buf_len
+= snprintf(&buf
[buf_len
], 24, "/%u", e
[i
].priority
);
173 buf
[buf_len
++] = ' ';
176 buf
[buf_len
- 1] = '\0';
181 static void script_call_delayed(int signal
__attribute__((unused
)))
184 script_call((char*)delayed_call
);
188 void script_delay_call(const char *status
, int timeout
)
191 delayed_call
= strdup(status
);
192 signal(SIGALRM
, script_call_delayed
);
198 void script_call(const char *status
)
200 size_t dns_len
, search_len
, custom_len
, sntp_ip_len
, sntp_dns_len
;
201 size_t sip_ip_len
, sip_fqdn_len
;
207 struct in6_addr
*dns
= odhcp6c_get_state(STATE_DNS
, &dns_len
);
208 uint8_t *search
= odhcp6c_get_state(STATE_SEARCH
, &search_len
);
209 uint8_t *custom
= odhcp6c_get_state(STATE_CUSTOM_OPTS
, &custom_len
);
210 struct in6_addr
*sntp
= odhcp6c_get_state(STATE_SNTP_IP
, &sntp_ip_len
);
211 uint8_t *sntp_dns
= odhcp6c_get_state(STATE_SNTP_FQDN
, &sntp_dns_len
);
212 struct in6_addr
*sip
= odhcp6c_get_state(STATE_SIP_IP
, &sip_ip_len
);
213 uint8_t *sip_fqdn
= odhcp6c_get_state(STATE_SIP_FQDN
, &sip_fqdn_len
);
215 size_t prefix_len
, address_len
, ra_pref_len
, ra_route_len
, ra_dns_len
;
216 uint8_t *prefix
= odhcp6c_get_state(STATE_IA_PD
, &prefix_len
);
217 uint8_t *address
= odhcp6c_get_state(STATE_IA_NA
, &address_len
);
218 uint8_t *ra_pref
= odhcp6c_get_state(STATE_RA_PREFIX
, &ra_pref_len
);
219 uint8_t *ra_route
= odhcp6c_get_state(STATE_RA_ROUTE
, &ra_route_len
);
220 uint8_t *ra_dns
= odhcp6c_get_state(STATE_RA_DNS
, &ra_dns_len
);
222 // Don't set environment before forking, because env is leaky.
224 ipv6_to_env("RDNSS", dns
, dns_len
/ sizeof(*dns
));
225 ipv6_to_env("SNTP_IP", sntp
, sntp_ip_len
/ sizeof(*sntp
));
226 ipv6_to_env("SIP_IP", sip
, sip_ip_len
/ sizeof(*sip
));
227 fqdn_to_env("DOMAINS", search
, search_len
);
228 fqdn_to_env("SNTP_FQDN", sntp_dns
, sntp_dns_len
);
229 fqdn_to_env("SIP_DOMAIN", sip_fqdn
, sip_fqdn_len
);
230 bin_to_env(custom
, custom_len
);
231 entry_to_env("PREFIXES", prefix
, prefix_len
, ENTRY_PREFIX
);
232 entry_to_env("ADDRESSES", address
, address_len
, ENTRY_ADDRESS
);
233 entry_to_env("RA_ADDRESSES", ra_pref
, ra_pref_len
, ENTRY_ADDRESS
);
234 entry_to_env("RA_ROUTES", ra_route
, ra_route_len
, ENTRY_ROUTE
);
235 entry_to_env("RA_DNS", ra_dns
, ra_dns_len
, ENTRY_HOST
);
237 argv
[2] = (char*)status
;
238 execv(argv
[0], argv
);
242 // Delete lost prefixes and user opts
243 odhcp6c_clear_state(STATE_CUSTOM_OPTS
);