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1 office 1 /**
2 * @file net_backend_waitlink.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 * Module which waits for the link on a network interface.
32 *
33 * Synopsis: net.backend.waitlink(string ifname)
34 */
35  
36 #include <stdlib.h>
37 #include <string.h>
38  
39 #include <misc/get_iface_info.h>
40 #include <ncd/extra/NCDIfConfig.h>
41 #include <ncd/extra/NCDInterfaceMonitor.h>
42  
43 #include <ncd/module_common.h>
44  
45 #include <generated/blog_channel_ncd_net_backend_waitlink.h>
46  
47 struct instance {
48 NCDModuleInst *i;
49 NCDInterfaceMonitor monitor;
50 int up;
51 };
52  
53 static void instance_free (struct instance *o, int is_error);
54  
55 static void monitor_handler (struct instance *o, struct NCDInterfaceMonitor_event event)
56 {
57 ASSERT(event.event == NCDIFMONITOR_EVENT_LINK_UP || event.event == NCDIFMONITOR_EVENT_LINK_DOWN)
58  
59 int was_up = o->up;
60 o->up = (event.event == NCDIFMONITOR_EVENT_LINK_UP);
61  
62 if (o->up && !was_up) {
63 NCDModuleInst_Backend_Up(o->i);
64 }
65 else if (!o->up && was_up) {
66 NCDModuleInst_Backend_Down(o->i);
67 }
68 }
69  
70 static void monitor_handler_error (struct instance *o)
71 {
72 ModuleLog(o->i, BLOG_ERROR, "monitor error");
73  
74 instance_free(o, 1);
75 }
76  
77 static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
78 {
79 struct instance *o = vo;
80 o->i = i;
81  
82 // check arguments
83 NCDValRef ifname_arg;
84 if (!NCDVal_ListRead(params->args, 1, &ifname_arg)) {
85 ModuleLog(o->i, BLOG_ERROR, "wrong arity");
86 goto fail0;
87 }
88 if (!NCDVal_IsStringNoNulls(ifname_arg)) {
89 ModuleLog(o->i, BLOG_ERROR, "wrong type");
90 goto fail0;
91 }
92  
93 // null terminate ifname
94 NCDValNullTermString ifname_nts;
95 if (!NCDVal_StringNullTerminate(ifname_arg, &ifname_nts)) {
96 ModuleLog(i, BLOG_ERROR, "NCDVal_StringNullTerminate failed");
97 goto fail0;
98 }
99  
100 // get interface index
101 int ifindex;
102 int res = badvpn_get_iface_info(ifname_nts.data, NULL, NULL, &ifindex);
103 NCDValNullTermString_Free(&ifname_nts);
104 if (!res) {
105 ModuleLog(o->i, BLOG_ERROR, "failed to get interface index");
106 goto fail0;
107 }
108  
109 // init monitor
110 if (!NCDInterfaceMonitor_Init(&o->monitor, ifindex, NCDIFMONITOR_WATCH_LINK, i->params->iparams->reactor, o, (NCDInterfaceMonitor_handler)monitor_handler, (NCDInterfaceMonitor_handler_error)monitor_handler_error)) {
111 ModuleLog(o->i, BLOG_ERROR, "NCDInterfaceMonitor_Init failed");
112 goto fail0;
113 }
114  
115 // set not up
116 o->up = 0;
117 return;
118  
119 fail0:
120 NCDModuleInst_Backend_DeadError(i);
121 }
122  
123 static void instance_free (struct instance *o, int is_error)
124 {
125 // free monitor
126 NCDInterfaceMonitor_Free(&o->monitor);
127  
128 if (is_error) {
129 NCDModuleInst_Backend_DeadError(o->i);
130 } else {
131 NCDModuleInst_Backend_Dead(o->i);
132 }
133 }
134  
135 static void func_die (void *vo)
136 {
137 struct instance *o = vo;
138 instance_free(o, 0);
139 }
140  
141 static struct NCDModule modules[] = {
142 {
143 .type = "net.backend.waitlink",
144 .func_new2 = func_new,
145 .func_die = func_die,
146 .alloc_size = sizeof(struct instance)
147 }, {
148 .type = NULL
149 }
150 };
151  
152 const struct NCDModuleGroup ncdmodule_net_backend_waitlink = {
153 .modules = modules
154 };