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         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 101           s->af == AF_INET6 ? '6' : '4', str);
 102         list_add_tail(&s->list, &iface->proto_dns_servers);
 103 }
 104
 105 void
 106 interface_add_dns_server_list(struct interface *iface, struct blob_attr *list)
 107 {
 108         struct blob_attr *cur;
 109         int rem;
 110
 111         blobmsg_for_each_attr(cur, list, rem) {
 112                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 113                         continue;
 114
 115                 if (!blobmsg_check_attr(cur, NULL))
 116                         continue;
 117
 118                 interface_add_dns_server(iface, blobmsg_data(cur));
 119         }
 120 }
 121
 122 static void
 123 interface_clear_dns_servers(struct interface *iface)
 124 {
 125         struct dns_server *s, *tmp;
 126
 127         list_for_each_entry_safe(s, tmp, &iface->proto_dns_servers, list) {
 128                 list_del(&s->list);
 129                 free(s);
 130         }
 131 }
 132
 133 static void
 134 interface_clear_dns_search(struct interface *iface)
 135 {
 136         struct dns_search_domain *s, *tmp;
 137
 138         list_for_each_entry_safe(s, tmp, &iface->proto_dns_search, list) {
 139                 list_del(&s->list);
 140                 free(s);
 141         }
 142 }
 143
 144 void
 145 interface_clear_dns(struct interface *iface)
 146 {
 147         interface_clear_dns_servers(iface);
 148         interface_clear_dns_search(iface);
 149 }
 150
 151 void
 152 interface_write_resolv_conf(void)
 153 {
 154         struct interface *iface;
 155         struct dns_server *s;
 156         struct dns_search_domain *d;
 157         char *path = alloca(strlen(resolv_conf) + 5);
 158         const char *str;
 159         char buf[32];
 160         FILE *f;
 161
 162         sprintf(path, "%s.tmp", resolv_conf);
 163         unlink(path);
 164         f = fopen(path, "w");
 165         if (!f) {
 166                 D(INTERFACE, "Failed to open %s for writing\n", path);
 167                 return;
 168         }
 169
 170         vlist_for_each_element(&interfaces, iface, node) {
 171                 if (iface->state != IFS_UP)
 172                         continue;
 173
 174                 if (list_empty(&iface->proto_dns_search) &&
 175                     list_empty(&iface->proto_dns_servers))
 176                         continue;
 177
 178                 fprintf(f, "# Interface %s\n", iface->name);
 179                 list_for_each_entry(s, &iface->proto_dns_servers, list) {
 180                         str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 181                         if (!str)
 182                                 continue;
 183
 184                         fprintf(f, "nameserver %s\n", str);
 185                 }
 186
 187                 list_for_each_entry(d, &iface->proto_dns_search, list) {
 188                         fprintf(f, "search %s\n", d->name);
 189                 }
 190         }
 191         fclose(f);
 192         if (rename(path, resolv_conf) < 0) {
 193                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 194                 unlink(path);
 195         }
 196 }
 197
 198 void
 199 interface_ip_init(struct interface *iface)
 200 {
 201         vlist_init(&iface->proto_route, route_cmp, interface_update_proto_route,
 202                    struct device_route, node, mask);
 203         vlist_init(&iface->proto_addr, addr_cmp, interface_update_proto_addr,
 204                    struct device_addr, node, mask);
 205 }