2 * Copyright (C) 2012 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.
20 #include <arpa/inet.h>
21 #include <netinet/in.h>
25 static const char hexdigits[] = "0123456789abcdef";
26 static const char hexvals[] = {
27 -1, -1, -1, -1, -1, -1, -1, -1, -1, -2, -2, -1, -1, -2, -1, -1,
28 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
29 -2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
30 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
31 -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
32 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -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,
39 static char *argv[4] = {NULL, NULL, NULL, NULL};
42 int script_init(const char *path, const char *ifname)
44 argv[0] = (char*)path;
45 argv[1] = (char*)ifname;
50 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src)
53 for (c = 0; c < len && src[0] && src[1]; ++c) {
54 int8_t x = (int8_t)*src++;
55 int8_t y = (int8_t)*src++;
56 if (x < 0 || (x = hexvals[x]) < 0
57 || y < 0 || (y = hexvals[y]) < 0)
60 while (*src < 0 || (*src && hexvals[(uint8_t)*src] < 0))
68 void script_hexlify(char *dst, const uint8_t *src, size_t len) {
69 for (size_t i = 0; i < len; ++i) {
70 *dst++ = hexdigits[src[i] >> 4];
71 *dst++ = hexdigits[src[i] & 0x0f];
77 static void ipv6_to_env(const char *name,
78 const struct in6_addr *addr, size_t cnt)
80 size_t buf_len = strlen(name);
81 char *buf = realloc(NULL, cnt * INET6_ADDRSTRLEN + buf_len + 2);
82 memcpy(buf, name, buf_len);
84 for (size_t i = 0; i < cnt; ++i) {
85 inet_ntop(AF_INET6, &addr[i], &buf[buf_len], INET6_ADDRSTRLEN);
86 buf_len += strlen(&buf[buf_len]);
89 buf[buf_len - 1] = '\0';
94 static void fqdn_to_env(const char *name, const uint8_t *fqdn, size_t len)
96 size_t buf_len = strlen(name);
97 const uint8_t *fqdn_end = fqdn + len;
98 char *buf = realloc(NULL, len + buf_len + 2);
99 memcpy(buf, name, buf_len);
100 buf[buf_len++] = '=';
102 while (l > 0 && fqdn < fqdn_end) {
103 l = dn_expand(fqdn, &fqdn[len], fqdn, &buf[buf_len], len);
105 buf_len += strlen(&buf[buf_len]);
106 buf[buf_len++] = ' ';
108 buf[buf_len - 1] = '\0';
113 static void bin_to_env(uint8_t *opts, size_t len)
115 uint8_t *oend = opts + len, *odata;
116 uint16_t otype, olen;
117 dhcpv6_for_each_option(opts, oend, otype, olen, odata) {
118 char *buf = realloc(NULL, 14 + (olen * 2));
121 snprintf(buf, 14, "OPTION_%hu=", otype);
122 buf_len += strlen(buf);
124 script_hexlify(&buf[buf_len], odata, olen);
130 static void prefix_to_env(const char *name, const uint8_t *fqdn, size_t len)
132 size_t buf_len = strlen(name);
133 struct dhcpv6_ia_prefix *p = NULL;
134 char *buf = realloc(NULL, buf_len + 2 +
135 (len / sizeof(*p)) * (INET6_ADDRSTRLEN + 32));
136 memcpy(buf, name, buf_len);
137 buf[buf_len++] = '=';
139 uint16_t otype, olen;
141 dhcpv6_for_each_option(fqdn, &fqdn[len], otype, olen, odata) {
142 if (otype != DHCPV6_OPT_IA_PREFIX || olen + 4U < sizeof(*p))
145 p = (struct dhcpv6_ia_prefix*)&odata[-4];
146 inet_ntop(AF_INET6, &p->addr, &buf[buf_len], INET6_ADDRSTRLEN);
147 buf_len += strlen(&buf[buf_len]);
148 buf_len += snprintf(&buf[buf_len], 32, "/%hhu,%u,%u ",
149 p->prefix, ntohl(p->preferred),
152 buf[buf_len - 1] = '\0';
157 void script_call(const char *status)
159 size_t dns_len, search_len, custom_len;
160 struct in6_addr *dns = odhcp6c_get_state(STATE_DNS, &dns_len);
161 uint8_t *search = odhcp6c_get_state(STATE_SEARCH, &search_len);
162 uint8_t *custom = odhcp6c_get_state(STATE_CUSTOM_OPTS, &custom_len);
164 size_t prefix_len, lost_pd_len;
165 uint8_t *prefix = odhcp6c_get_state(STATE_IA_PD, &prefix_len);
166 uint8_t *lost_pd = odhcp6c_get_state(STATE_IA_PD_LOST, &lost_pd_len);
168 // Don't set environment before forking, because env is leaky.
170 ipv6_to_env("RDNSS", dns, dns_len / sizeof(*dns));
171 fqdn_to_env("DOMAINS", search, search_len);
172 bin_to_env(custom, custom_len);
173 prefix_to_env("PREFIXES", prefix, prefix_len);
174 prefix_to_env("PREFIXES_LOST", lost_pd, lost_pd_len);
176 argv[2] = (char*)status;
177 execv(argv[0], argv);
181 // Delete lost prefixes and user opts
182 odhcp6c_clear_state(STATE_IA_PD_LOST);
183 odhcp6c_clear_state(STATE_CUSTOM_OPTS);