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1 office 1 /**
2 * @file net_ipv6_wait_dynamic_addr.c
3 * @author Ambroz Bizjak <ambrop7@gmail.com>
4 *
5 * @section LICENSE
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the author nor the
15 * names of its contributors may be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * @section DESCRIPTION
30 *
31 * Synopsis:
32 * net.ipv6.wait_dynamic_addr(string ifname)
33 *
34 * Description:
35 * Waits for a dynamic IPv6 address to be obtained on the interface,
36 * and goes up when it is obtained.
37 * If the address is subsequently lost, goes back down and again waits
38 * for an address.
39 *
40 * Variables:
41 * string addr - dynamic address obtained on the interface
42 * string prefix - prefix length
43 * string cidr_addr - address and prefix (addr/prefix)
44 */
45  
46 #include <stdlib.h>
47 #include <string.h>
48 #include <stdio.h>
49  
50 #include <misc/get_iface_info.h>
51 #include <misc/ipaddr6.h>
52 #include <ncd/extra/NCDInterfaceMonitor.h>
53  
54 #include <ncd/module_common.h>
55  
56 #include <generated/blog_channel_ncd_net_ipv6_wait_dynamic_addr.h>
57  
58 struct instance {
59 NCDModuleInst *i;
60 NCDInterfaceMonitor monitor;
61 struct ipv6_ifaddr ifaddr;
62 int up;
63 };
64  
65 static void instance_free (struct instance *o, int is_error);
66  
67 static void monitor_handler (struct instance *o, struct NCDInterfaceMonitor_event event)
68 {
69 if (!o->up && event.event == NCDIFMONITOR_EVENT_IPV6_ADDR_ADDED && (event.u.ipv6_addr.addr_flags & NCDIFMONITOR_ADDR_FLAG_DYNAMIC)) {
70 // rememeber address, set up
71 o->ifaddr = event.u.ipv6_addr.addr;
72 o->up = 1;
73  
74 // signal up
75 NCDModuleInst_Backend_Up(o->i);
76 }
77 else if (o->up && event.event == NCDIFMONITOR_EVENT_IPV6_ADDR_REMOVED && !memcmp(event.u.ipv6_addr.addr.addr.bytes, o->ifaddr.addr.bytes, 16) && event.u.ipv6_addr.addr.prefix == o->ifaddr.prefix) {
78 // set not up
79 o->up = 0;
80  
81 // signal down
82 NCDModuleInst_Backend_Down(o->i);
83 }
84 }
85  
86 static void monitor_handler_error (struct instance *o)
87 {
88 ModuleLog(o->i, BLOG_ERROR, "monitor error");
89  
90 instance_free(o, 1);
91 }
92  
93 static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
94 {
95 struct instance *o = vo;
96 o->i = i;
97  
98 // read arguments
99 NCDValRef ifname_arg;
100 if (!NCDVal_ListRead(params->args, 1, &ifname_arg)) {
101 ModuleLog(o->i, BLOG_ERROR, "wrong arity");
102 goto fail0;
103 }
104 if (!NCDVal_IsStringNoNulls(ifname_arg)) {
105 ModuleLog(o->i, BLOG_ERROR, "wrong type");
106 goto fail0;
107 }
108  
109 // null terminate ifname
110 NCDValNullTermString ifname_nts;
111 if (!NCDVal_StringNullTerminate(ifname_arg, &ifname_nts)) {
112 ModuleLog(i, BLOG_ERROR, "NCDVal_StringNullTerminate failed");
113 goto fail0;
114 }
115  
116 // get interface index
117 int ifindex;
118 int res = badvpn_get_iface_info(ifname_nts.data, NULL, NULL, &ifindex);
119 NCDValNullTermString_Free(&ifname_nts);
120 if (!res) {
121 ModuleLog(o->i, BLOG_ERROR, "failed to get interface index");
122 goto fail0;
123 }
124  
125 // init monitor
126 if (!NCDInterfaceMonitor_Init(&o->monitor, ifindex, NCDIFMONITOR_WATCH_IPV6_ADDR, i->params->iparams->reactor, o, (NCDInterfaceMonitor_handler)monitor_handler, (NCDInterfaceMonitor_handler_error)monitor_handler_error)) {
127 ModuleLog(o->i, BLOG_ERROR, "NCDInterfaceMonitor_Init failed");
128 goto fail0;
129 }
130  
131 // set not up
132 o->up = 0;
133 return;
134  
135 fail0:
136 NCDModuleInst_Backend_DeadError(i);
137 }
138  
139 static void instance_free (struct instance *o, int is_error)
140 {
141 // free monitor
142 NCDInterfaceMonitor_Free(&o->monitor);
143  
144 if (is_error) {
145 NCDModuleInst_Backend_DeadError(o->i);
146 } else {
147 NCDModuleInst_Backend_Dead(o->i);
148 }
149 }
150  
151 static void func_die (void *vo)
152 {
153 struct instance *o = vo;
154 instance_free(o, 0);
155 }
156  
157 static int func_getvar (void *vo, const char *name, NCDValMem *mem, NCDValRef *out)
158 {
159 struct instance *o = vo;
160 ASSERT(o->up)
161  
162 if (!strcmp(name, "addr")) {
163 char str[IPADDR6_PRINT_MAX];
164 ipaddr6_print_addr(o->ifaddr.addr, str);
165 *out = NCDVal_NewString(mem, str);
166 return 1;
167 }
168  
169 if (!strcmp(name, "prefix")) {
170 char str[10];
171 sprintf(str, "%d", o->ifaddr.prefix);
172 *out = NCDVal_NewString(mem, str);
173 return 1;
174 }
175  
176 if (!strcmp(name, "cidr_addr")) {
177 char str[IPADDR6_PRINT_MAX];
178 ipaddr6_print_ifaddr(o->ifaddr, str);
179 *out = NCDVal_NewString(mem, str);
180 return 1;
181 }
182  
183 return 0;
184 }
185  
186 static struct NCDModule modules[] = {
187 {
188 .type = "net.ipv6.wait_dynamic_addr",
189 .func_new2 = func_new,
190 .func_die = func_die,
191 .func_getvar = func_getvar,
192 .alloc_size = sizeof(struct instance)
193 }, {
194 .type = NULL
195 }
196 };
197  
198 const struct NCDModuleGroup ncdmodule_net_ipv6_wait_dynamic_addr = {
199 .modules = modules
200 };