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>
25 #include <netinet/in.h>
29 static const char hexdigits[] = "0123456789abcdef";
30 static const int8_t hexvals[] = {
31 -1, -1, -1, -1, -1, -1, -1, -1, -1, -2, -2, -1, -1, -2, -1, -1,
32 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
33 -2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
34 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -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,
37 -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
38 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
43 static char *argv[4] = {NULL, NULL, NULL, 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';
118 static void bin_to_env(uint8_t *opts, size_t len)
120 uint8_t *oend = opts + len, *odata;
121 uint16_t otype, olen;
122 dhcpv6_for_each_option(opts, oend, otype, olen, odata) {
123 char *buf = realloc(NULL, 14 + (olen * 2));
126 snprintf(buf, 14, "OPTION_%hu=", otype);
127 buf_len += strlen(buf);
129 script_hexlify(&buf[buf_len], odata, olen);
141 static void entry_to_env(const char *name, const void *data, size_t len, enum entry_type type)
143 size_t buf_len = strlen(name);
144 const struct odhcp6c_entry *e = data;
145 char *buf = realloc(NULL, buf_len + 2 + (len / sizeof(*e)) * 144);
146 memcpy(buf, name, buf_len);
147 buf[buf_len++] = '=';
149 for (size_t i = 0; i < len / sizeof(*e); ++i) {
150 inet_ntop(AF_INET6, &e[i].target, &buf[buf_len], INET6_ADDRSTRLEN);
151 buf_len += strlen(&buf[buf_len]);
152 if (type != ENTRY_HOST) {
153 buf_len += snprintf(&buf[buf_len], 6, "/%"PRIu16, e[i].length);
154 if (type == ENTRY_ROUTE) {
155 buf[buf_len++] = ',';
156 if (!IN6_IS_ADDR_UNSPECIFIED(&e[i].router)) {
157 inet_ntop(AF_INET6, &e[i].router, &buf[buf_len], INET6_ADDRSTRLEN);
158 buf_len += strlen(&buf[buf_len]);
160 buf_len += snprintf(&buf[buf_len], 24, ",%u", e[i].valid);
161 buf_len += snprintf(&buf[buf_len], 12, ",%u", e[i].priority);
163 buf_len += snprintf(&buf[buf_len], 24, ",%u,%u", e[i].preferred, e[i].valid);
166 if (type == ENTRY_PREFIX && ntohl(e[i].iaid) != 1)
167 buf_len += snprintf(&buf[buf_len], 16, ",class=%08x", ntohl(e[i].iaid));
169 if (type == ENTRY_PREFIX && e[i].priority) {
170 // priority and router are abused for prefix exclusion
171 buf_len += snprintf(&buf[buf_len], 12, ",excluded=");
172 inet_ntop(AF_INET6, &e[i].router, &buf[buf_len], INET6_ADDRSTRLEN);
173 buf_len += strlen(&buf[buf_len]);
174 buf_len += snprintf(&buf[buf_len], 24, "/%u", e[i].priority);
177 buf[buf_len++] = ' ';
180 buf[buf_len - 1] = '\0';
185 static void search_to_env(const char *name, const uint8_t *start, size_t len)
187 size_t buf_len = strlen(name);
188 char *buf = realloc(NULL, buf_len + 2 + len);
189 char *c = mempcpy(buf, name, buf_len);
192 for (struct odhcp6c_entry *e = (struct odhcp6c_entry*)start;
193 (uint8_t*)e < &start[len] && &e->auxtarget[e->auxlen] <= &start[len];
194 e = (struct odhcp6c_entry*)(&e->auxtarget[e->auxlen])) {
195 c = mempcpy(c, e->auxtarget, e->auxlen);
204 static void int_to_env(const char *name, int value)
206 size_t len = 12 + strlen(name);
207 char *buf = realloc(NULL, len);
208 snprintf(buf, len, "%s=%d", name, value);
213 static void s46_to_env_portparams(const uint8_t *data, size_t len, FILE *fp)
216 uint16_t otype, olen;
217 dhcpv6_for_each_option(data, &data[len], otype, olen, odata) {
218 if (otype == DHCPV6_OPT_S46_PORTPARAMS &&
219 olen == sizeof(struct dhcpv6_s46_portparams)) {
220 struct dhcpv6_s46_portparams *params = (void*)odata;
221 fprintf(fp, "offset=%d,psidlen=%d,psid=%d,",
222 params->offset, params->psid_len, ntohs(params->psid));
228 static void s46_to_env(enum odhcp6c_state state, const uint8_t *data, size_t len)
230 const char *name = (state == STATE_S46_MAPE) ? "MAPE" :
231 (state == STATE_S46_MAPT) ? "MAPT" : "LW4O6";
239 FILE *fp = open_memstream(&str, &strsize);
243 const char *type = (state == STATE_S46_MAPE) ? "map-e" :
244 (state == STATE_S46_MAPT) ? "map-t" : "lw4o6";
247 uint16_t otype, olen;
248 dhcpv6_for_each_option(data, &data[len], otype, olen, odata) {
249 struct dhcpv6_s46_rule *rule = (struct dhcpv6_s46_rule*)odata;
250 struct dhcpv6_s46_v4v6bind *bind = (struct dhcpv6_s46_v4v6bind*)odata;
252 if (state != STATE_S46_LW && otype == DHCPV6_OPT_S46_RULE &&
253 olen >= sizeof(struct dhcpv6_s46_rule)) {
254 char buf4[INET_ADDRSTRLEN];
255 char buf6[INET6_ADDRSTRLEN];
256 struct in6_addr in6 = IN6ADDR_ANY_INIT;
258 size_t prefix6len = rule->prefix6_len;
259 prefix6len = (prefix6len % 8 == 0) ? prefix6len / 8 : prefix6len / 8 + 1;
261 if (olen < sizeof(struct dhcpv6_s46_rule) + prefix6len)
264 memcpy(&in6, rule->ipv6_prefix, prefix6len);
266 inet_ntop(AF_INET, &rule->ipv4_prefix, buf4, sizeof(buf4));
267 inet_ntop(AF_INET6, &in6, buf6, sizeof(buf6));
272 fprintf(fp, "type=%s,ealen=%d,prefix4len=%d,prefix6len=%d,ipv4prefix=%s,ipv6prefix=%s,",
273 type, rule->ea_len, rule->prefix4_len, rule->prefix6_len, buf4, buf6);
275 s46_to_env_portparams(&rule->ipv6_prefix[prefix6len],
276 olen - sizeof(*rule) - prefix6len, fp);
278 dhcpv6_for_each_option(data, &data[len], otype, olen, odata) {
279 if (state != STATE_S46_MAPT && otype == DHCPV6_OPT_S46_BR &&
280 olen == sizeof(struct in6_addr)) {
281 inet_ntop(AF_INET6, odata, buf6, sizeof(buf6));
282 fprintf(fp, "br=%s,", buf6);
283 } else if (state == STATE_S46_MAPT && otype == DHCPV6_OPT_S46_DMR &&
284 olen >= sizeof(struct dhcpv6_s46_dmr)) {
285 struct dhcpv6_s46_dmr *dmr = (struct dhcpv6_s46_dmr*)odata;
286 memset(&in6, 0, sizeof(in6));
287 size_t prefix6len = dmr->dmr_prefix6_len;
288 prefix6len = (prefix6len % 8 == 0) ? prefix6len / 8 : prefix6len / 8 + 1;
290 if (olen < sizeof(struct dhcpv6_s46_dmr) + prefix6len)
293 memcpy(&in6, dmr->dmr_ipv6_prefix, prefix6len);
294 inet_ntop(AF_INET6, &in6, buf6, sizeof(buf6));
295 fprintf(fp, "dmr=%s/%d,", buf6, dmr->dmr_prefix6_len);
298 } else if (state == STATE_S46_LW && otype == DHCPV6_OPT_S46_V4V6BIND &&
299 olen >= sizeof(struct dhcpv6_s46_v4v6bind)) {
300 char buf4[INET_ADDRSTRLEN];
301 char buf6[INET6_ADDRSTRLEN];
302 struct in6_addr in6 = IN6ADDR_ANY_INIT;
304 size_t prefix6len = bind->bindprefix6_len;
305 prefix6len = (prefix6len % 8 == 0) ? prefix6len / 8 : prefix6len / 8 + 1;
307 if (olen < sizeof(struct dhcpv6_s46_v4v6bind) + prefix6len)
310 memcpy(&in6, bind->bind_ipv6_prefix, prefix6len);
312 inet_ntop(AF_INET, &bind->ipv4_address, buf4, sizeof(buf4));
313 inet_ntop(AF_INET6, &in6, buf6, sizeof(buf6));
315 fprintf(fp, "type=%s,ipv4address=%s,prefix6len=%d,ipv6prefix=%s,",
316 type, buf4, bind->bindprefix6_len, buf6);
318 s46_to_env_portparams(&bind->bind_ipv6_prefix[prefix6len],
319 olen - sizeof(*bind) - prefix6len, fp);
321 dhcpv6_for_each_option(data, &data[len], otype, olen, odata) {
322 if (otype == DHCPV6_OPT_S46_BR && olen == sizeof(struct in6_addr)) {
323 inet_ntop(AF_INET6, odata, buf6, sizeof(buf6));
324 fprintf(fp, "br=%s,", buf6);
337 void script_call(const char *status)
339 size_t dns_len, search_len, custom_len, sntp_ip_len, ntp_ip_len, ntp_dns_len;
340 size_t sip_ip_len, sip_fqdn_len, aftr_name_len, cer_len, addr_len;
341 size_t s46_mapt_len, s46_mape_len, s46_lw_len, passthru_len;
345 struct in6_addr *addr = odhcp6c_get_state(STATE_SERVER_ADDR, &addr_len);
346 struct in6_addr *dns = odhcp6c_get_state(STATE_DNS, &dns_len);
347 uint8_t *search = odhcp6c_get_state(STATE_SEARCH, &search_len);
348 uint8_t *custom = odhcp6c_get_state(STATE_CUSTOM_OPTS, &custom_len);
349 struct in6_addr *sntp = odhcp6c_get_state(STATE_SNTP_IP, &sntp_ip_len);
350 struct in6_addr *ntp = odhcp6c_get_state(STATE_NTP_IP, &ntp_ip_len);
351 uint8_t *ntp_dns = odhcp6c_get_state(STATE_NTP_FQDN, &ntp_dns_len);
352 struct in6_addr *sip = odhcp6c_get_state(STATE_SIP_IP, &sip_ip_len);
353 uint8_t *sip_fqdn = odhcp6c_get_state(STATE_SIP_FQDN, &sip_fqdn_len);
354 uint8_t *aftr_name = odhcp6c_get_state(STATE_AFTR_NAME, &aftr_name_len);
355 struct in6_addr *cer = odhcp6c_get_state(STATE_CER, &cer_len);
356 uint8_t *s46_mapt = odhcp6c_get_state(STATE_S46_MAPT, &s46_mapt_len);
357 uint8_t *s46_mape = odhcp6c_get_state(STATE_S46_MAPE, &s46_mape_len);
358 uint8_t *s46_lw = odhcp6c_get_state(STATE_S46_LW, &s46_lw_len);
359 uint8_t *passthru = odhcp6c_get_state(STATE_PASSTHRU, &passthru_len);
361 size_t prefix_len, address_len, ra_pref_len,
362 ra_route_len, ra_dns_len, ra_search_len;
363 uint8_t *prefix = odhcp6c_get_state(STATE_IA_PD, &prefix_len);
364 uint8_t *address = odhcp6c_get_state(STATE_IA_NA, &address_len);
365 uint8_t *ra_pref = odhcp6c_get_state(STATE_RA_PREFIX, &ra_pref_len);
366 uint8_t *ra_route = odhcp6c_get_state(STATE_RA_ROUTE, &ra_route_len);
367 uint8_t *ra_dns = odhcp6c_get_state(STATE_RA_DNS, &ra_dns_len);
368 uint8_t *ra_search = odhcp6c_get_state(STATE_RA_SEARCH, &ra_search_len);
370 // Don't set environment before forking, because env is leaky.
372 ipv6_to_env("SERVER", addr, addr_len / sizeof(*addr));
373 ipv6_to_env("RDNSS", dns, dns_len / sizeof(*dns));
374 ipv6_to_env("SNTP_IP", sntp, sntp_ip_len / sizeof(*sntp));
375 ipv6_to_env("NTP_IP", ntp, ntp_ip_len / sizeof(*ntp));
376 fqdn_to_env("NTP_FQDN", ntp_dns, ntp_dns_len);
377 ipv6_to_env("SIP_IP", sip, sip_ip_len / sizeof(*sip));
378 fqdn_to_env("DOMAINS", search, search_len);
379 fqdn_to_env("SIP_DOMAIN", sip_fqdn, sip_fqdn_len);
380 fqdn_to_env("AFTR", aftr_name, aftr_name_len);
381 ipv6_to_env("CER", cer, cer_len / sizeof(*cer));
382 s46_to_env(STATE_S46_MAPE, s46_mape, s46_mape_len);
383 s46_to_env(STATE_S46_MAPT, s46_mapt, s46_mapt_len);
384 s46_to_env(STATE_S46_LW, s46_lw, s46_lw_len);
385 bin_to_env(custom, custom_len);
387 if (odhcp6c_is_bound()) {
388 entry_to_env("PREFIXES", prefix, prefix_len, ENTRY_PREFIX);
389 entry_to_env("ADDRESSES", address, address_len, ENTRY_ADDRESS);
392 entry_to_env("RA_ADDRESSES", ra_pref, ra_pref_len, ENTRY_ADDRESS);
393 entry_to_env("RA_ROUTES", ra_route, ra_route_len, ENTRY_ROUTE);
394 entry_to_env("RA_DNS", ra_dns, ra_dns_len, ENTRY_HOST);
395 search_to_env("RA_DOMAINS", ra_search, ra_search_len);
397 int_to_env("RA_HOPLIMIT", ra_conf_hoplimit(0));
398 int_to_env("RA_MTU", ra_conf_mtu(0));
399 int_to_env("RA_REACHABLE", ra_conf_reachable(0));
400 int_to_env("RA_RETRANSMIT", ra_conf_retransmit(0));
402 char *buf = malloc(10 + passthru_len * 2);
403 strncpy(buf, "PASSTHRU=", 10);
404 script_hexlify(&buf[9], passthru, passthru_len);
407 argv[2] = (char*)status;
408 execv(argv[0], argv);
412 // Delete lost prefixes and user opts
413 odhcp6c_clear_state(STATE_CUSTOM_OPTS);