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 static void
  83 interface_clear_dns_servers(struct interface *iface)
  84 {
  85         struct dns_server *s, *tmp;
  86
  87         list_for_each_entry_safe(s, tmp, &iface->proto_dns_servers, list) {
  88                 list_del(&s->list);
  89                 free(s);
  90         }
  91 }
  92
  93 static void
  94 interface_clear_dns_search(struct interface *iface)
  95 {
  96         struct dns_search_domain *s, *tmp;
  97
  98         list_for_each_entry_safe(s, tmp, &iface->proto_dns_search, list) {
  99                 list_del(&s->list);
 100                 free(s);
 101         }
 102 }
 103
 104 void
 105 interface_clear_dns(struct interface *iface)
 106 {
 107         interface_clear_dns_servers(iface);
 108         interface_clear_dns_search(iface);
 109 }
 110
 111 void
 112 interface_write_resolv_conf(void)
 113 {
 114         struct interface *iface;
 115         struct dns_server *s;
 116         struct dns_search_domain *d;
 117         char *path = alloca(strlen(resolv_conf) + 5);
 118         const char *str;
 119         char buf[32];
 120         FILE *f;
 121
 122         sprintf(path, "%s.tmp", resolv_conf);
 123         unlink(path);
 124         f = fopen(path, "w");
 125         if (!f) {
 126                 D(INTERFACE, "Failed to open %s for writing\n", path);
 127                 return;
 128         }
 129
 130         vlist_for_each_element(&interfaces, iface, node) {
 131                 if (iface->state != IFS_UP)
 132                         continue;
 133
 134                 if (list_empty(&iface->proto_dns_search) &&
 135                     list_empty(&iface->proto_dns_servers))
 136                         continue;
 137
 138                 fprintf(f, "# Interface %s\n", iface->name);
 139                 list_for_each_entry(s, &iface->proto_dns_servers, list) {
 140                         str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 141                         if (!str)
 142                                 continue;
 143
 144                         fprintf(f, "nameserver %s\n", str);
 145                 }
 146
 147                 list_for_each_entry(d, &iface->proto_dns_search, list) {
 148                         fprintf(f, "search %s\n", d->name);
 149                 }
 150         }
 151         fclose(f);
 152         if (rename(path, resolv_conf) < 0) {
 153                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 154                 unlink(path);
 155         }
 156 }
 157
 158 void
 159 interface_ip_init(struct interface *iface)
 160 {
 161         vlist_init(&iface->proto_route, route_cmp, interface_update_proto_route,
 162                    struct device_route, node, mask);
 163         vlist_init(&iface->proto_addr, addr_cmp, interface_update_proto_addr,
 164                    struct device_addr, node, mask);
 165 }