interface-ip.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <unistd.h>
   5
   6 #include <arpa/inet.h>
   7
   8 #include "netifd.h"
   9 #include "device.h"
  10 #include "interface.h"
  11 #include "interface-ip.h"
  12 #include "proto.h"
  13 #include "ubus.h"
  14 #include "system.h"
  15
  16 static int
  17 addr_cmp(const void *k1, const void *k2, void *ptr)
  18 {
  19         return memcmp(k1, k2, sizeof(struct device_addr) -
  20                       offsetof(struct device_addr, mask));
  21 }
  22
  23 static int
  24 route_cmp(const void *k1, const void *k2, void *ptr)
  25 {
  26         return memcmp(k1, k2, sizeof(struct device_route) -
  27                       offsetof(struct device_route, mask));
  28 }
  29
  30 static void
  31 interface_update_proto_addr(struct vlist_tree *tree,
  32                             struct vlist_node *node_new,
  33                             struct vlist_node *node_old)
  34 {
  35         struct interface *iface;
  36         struct device *dev;
  37         struct device_addr *addr;
  38
  39         iface = container_of(tree, struct interface, proto_addr);
  40         dev = iface->l3_dev->dev;
  41
  42         if (node_old) {
  43                 addr = container_of(node_old, struct device_addr, node);
  44                 if (!(addr->flags & DEVADDR_EXTERNAL))
  45                         system_del_address(dev, addr);
  46                 free(addr);
  47         }
  48
  49         if (node_new) {
  50                 addr = container_of(node_new, struct device_addr, node);
  51                 if (!(addr->flags & DEVADDR_EXTERNAL))
  52                         system_add_address(dev, addr);
  53         }
  54 }
  55
  56 static void
  57 interface_update_proto_route(struct vlist_tree *tree,
  58                              struct vlist_node *node_new,
  59                              struct vlist_node *node_old)
  60 {
  61         struct interface *iface;
  62         struct device *dev;
  63         struct device_route *route;
  64
  65         iface = container_of(tree, struct interface, proto_route);
  66         dev = iface->l3_dev->dev;
  67
  68         if (node_old) {
  69                 route = container_of(node_old, struct device_route, node);
  70                 if (!(route->flags & DEVADDR_EXTERNAL))
  71                         system_del_route(dev, route);
  72                 free(route);
  73         }
  74
  75         if (node_new) {
  76                 route = container_of(node_new, struct device_route, node);
  77                 if (!(route->flags & DEVADDR_EXTERNAL))
  78                         system_add_route(dev, route);
  79         }
  80 }
  81
  82 void
  83 interface_add_dns_server(struct interface *iface, const char *str)
  84 {
  85         struct dns_server *s;
  86
  87         s = calloc(1, sizeof(*s));
  88         s->af = AF_INET;
  89         if (inet_pton(s->af, str, &s->addr.in))
  90                 goto add;
  91
  92         s->af = AF_INET6;
  93         if (inet_pton(s->af, str, &s->addr.in))
  94                 goto add;
  95
  96         free(s);
  97         return;
  98
  99 add:
 100         list_add_tail(&s->list, &iface->proto_dns_servers);
 101 }
 102
 103 void
 104 interface_add_dns_server_list(struct interface *iface, struct blob_attr *list)
 105 {
 106         struct blob_attr *cur;
 107         int rem;
 108
 109         blobmsg_for_each_attr(cur, list, rem) {
 110                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 111                         continue;
 112
 113                 if (!blobmsg_check_attr(cur, NULL))
 114                         continue;
 115
 116                 interface_add_dns_server(iface, blobmsg_data(cur));
 117         }
 118 }
 119
 120 static void
 121 interface_clear_dns_servers(struct interface *iface)
 122 {
 123         struct dns_server *s, *tmp;
 124
 125         list_for_each_entry_safe(s, tmp, &iface->proto_dns_servers, list) {
 126                 list_del(&s->list);
 127                 free(s);
 128         }
 129 }
 130
 131 static void
 132 interface_clear_dns_search(struct interface *iface)
 133 {
 134         struct dns_search_domain *s, *tmp;
 135
 136         list_for_each_entry_safe(s, tmp, &iface->proto_dns_search, list) {
 137                 list_del(&s->list);
 138                 free(s);
 139         }
 140 }
 141
 142 void
 143 interface_clear_dns(struct interface *iface)
 144 {
 145         interface_clear_dns_servers(iface);
 146         interface_clear_dns_search(iface);
 147 }
 148
 149 void
 150 interface_write_resolv_conf(void)
 151 {
 152         struct interface *iface;
 153         struct dns_server *s;
 154         struct dns_search_domain *d;
 155         char *path = alloca(strlen(resolv_conf) + 5);
 156         const char *str;
 157         char buf[32];
 158         FILE *f;
 159
 160         sprintf(path, "%s.tmp", resolv_conf);
 161         unlink(path);
 162         f = fopen(path, "w");
 163         if (!f) {
 164                 D(INTERFACE, "Failed to open %s for writing\n", path);
 165                 return;
 166         }
 167
 168         vlist_for_each_element(&interfaces, iface, node) {
 169                 if (iface->state != IFS_UP)
 170                         continue;
 171
 172                 if (list_empty(&iface->proto_dns_search) &&
 173                     list_empty(&iface->proto_dns_servers))
 174                         continue;
 175
 176                 fprintf(f, "# Interface %s\n", iface->name);
 177                 list_for_each_entry(s, &iface->proto_dns_servers, list) {
 178                         str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 179                         if (!str)
 180                                 continue;
 181
 182                         fprintf(f, "nameserver %s\n", str);
 183                 }
 184
 185                 list_for_each_entry(d, &iface->proto_dns_search, list) {
 186                         fprintf(f, "search %s\n", d->name);
 187                 }
 188         }
 189         fclose(f);
 190         if (rename(path, resolv_conf) < 0) {
 191                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 192                 unlink(path);
 193         }
 194 }
 195
 196 void
 197 interface_ip_init(struct interface *iface)
 198 {
 199         vlist_init(&iface->proto_route, route_cmp, interface_update_proto_route,
 200                    struct device_route, node, mask);
 201         vlist_init(&iface->proto_addr, addr_cmp, interface_update_proto_addr,
 202                    struct device_addr, node, mask);
 203 }