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#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include "netifd.h"
#include "interface.h"
#include "proto.h"
struct v4_addr {
struct in_addr addr;
unsigned int prefix;
};
struct v6_addr {
struct in6_addr addr;
unsigned int prefix;
};
struct static_proto_state {
struct interface_proto_state proto;
int n_v4;
struct v4_addr *v4;
int n_v6;
struct v4_addr *v6;
};
static int
static_handler(struct interface_proto_state *proto,
enum interface_proto_cmd cmd, bool force)
{
return 0;
}
static void
static_free(struct interface_proto_state *proto)
{
struct static_proto_state *state;
state = container_of(proto, struct static_proto_state, proto);
free(state);
}
struct interface_proto_state *
static_create_state(struct v4_addr *v4, int n_v4, struct v6_addr *v6, int n_v6)
{
struct static_proto_state *state;
int v4_len = sizeof(struct v4_addr) * n_v4;
int v6_len = sizeof(struct v6_addr) * n_v6;
void *next;
state = calloc(1, sizeof(*state) + v4_len + v6_len);
state->proto.free = static_free;
state->proto.handler = static_handler;
state->proto.flags = PROTO_FLAG_IMMEDIATE;
next = (void *) state + 1;
if (n_v4) {
state->v4 = next;
memcpy(state->v4, v4, sizeof(*v4) * n_v4);
next = state->v4 + n_v4;
}
if (n_v6) {
state->v6 = next;
memcpy(state->v6, v6, sizeof(*v6) * n_v6);
}
return &state->proto;
}
static bool
split_netmask(char *str, unsigned int *netmask)
{
char *delim, *err = NULL;
delim = strchr(str, '/');
if (delim) {
*(delim++) = 0;
*netmask = strtoul(delim, &err, 10);
if (err && *err)
return false;
}
return true;
}
static int
parse_ip_and_netmask(int af, const char *str, void *addr, unsigned int *netmask)
{
char *astr = alloca(strlen(str) + 1);
strcpy(astr, str);
if (!split_netmask(astr, netmask))
return 0;
if (af == AF_INET6) {
if (*netmask > 128)
return 0;
} else {
if (*netmask > 32)
return 0;
}
return inet_pton(af, str, addr);
}
static int
parse_v4(const char *str, struct v4_addr *v4, int netmask)
{
v4->prefix = netmask;
return parse_ip_and_netmask(AF_INET, str, &v4->addr, &v4->prefix);
}
static int
parse_v6(const char *str, struct v6_addr *v6, int netmask)
{
v6->prefix = netmask;
return parse_ip_and_netmask(AF_INET6, str, &v6->addr, &v6->prefix);
}
static int
count_list_entries(struct uci_option *o)
{
struct uci_element *e;
int n = 0;
uci_foreach_element(&o->v.list, e)
n++;
return n;
}
enum {
OPT_IPADDR,
OPT_IP6ADDR,
OPT_NETMASK,
OPT_GATEWAY,
OPT_DNS,
__OPT_MAX,
};
static const struct uci_parse_option opts[__OPT_MAX] = {
[OPT_IPADDR] = { .name = "ipaddr" },
[OPT_IP6ADDR] = { .name = "ip6addr" },
[OPT_NETMASK] = { .name = "netmask", .type = UCI_TYPE_STRING },
[OPT_GATEWAY] = { .name = "gateway", .type = UCI_TYPE_STRING },
[OPT_DNS] = { .name = "dns" },
};
struct interface_proto_state *
static_attach(struct proto_handler *h, struct interface *iface,
struct uci_section *s)
{
struct uci_option *tb[__OPT_MAX];
struct uci_element *e;
struct v4_addr *v4 = NULL;
struct v6_addr *v6 = NULL;
int n_v4 = 0, n_v6 = 0;
struct in_addr ina = {};
const char *error = NULL;
int netmask = 32;
int i;
uci_parse_section(s, opts, __OPT_MAX, tb);
if (tb[OPT_NETMASK]) {
if (!inet_aton(tb[OPT_NETMASK]->v.string, &ina)) {
error = "INVALID_NETMASK";
goto error;
}
netmask = 32 - fls(~(ntohl(ina.s_addr)));
}
if (tb[OPT_IPADDR]) {
if (tb[OPT_IPADDR]->type == UCI_TYPE_STRING) {
n_v4 = 1;
v4 = alloca(sizeof(*v4));
if (!parse_v4(tb[OPT_IPADDR]->v.string, v4, netmask))
goto invalid_addr;
} else {
i = 0;
n_v4 = count_list_entries(tb[OPT_IPADDR]);
v4 = alloca(sizeof(*v4) * n_v4);
uci_foreach_element(&tb[OPT_IPADDR]->v.list, e) {
if (!parse_v4(e->name, &v4[i++], netmask))
goto invalid_addr;
}
}
}
if (tb[OPT_IP6ADDR]) {
if (tb[OPT_IP6ADDR]->type == UCI_TYPE_STRING) {
n_v6 = 1;
v6 = alloca(sizeof(*v6));
v6->prefix = netmask;
if (!parse_v6(tb[OPT_IP6ADDR]->v.string, v6, netmask))
goto invalid_addr;
} else {
i = 0;
n_v6 = count_list_entries(tb[OPT_IP6ADDR]);
v6 = alloca(sizeof(*v6) * n_v6);
uci_foreach_element(&tb[OPT_IP6ADDR]->v.list, e) {
if (!parse_v6(e->name, &v6[i++], netmask))
goto invalid_addr;
}
}
}
if (!n_v4 && !n_v6) {
error = "NO_ADDRESS";
goto error;
}
return static_create_state(v4, n_v4, v6, n_v6);
invalid_addr:
error = "INVALID_ADDRESS";
error:
interface_add_error(iface, "proto-static", error, NULL, 0);
return NULL;
}
static struct proto_handler static_proto = {
.name = "static",
.attach = static_attach,
};
static void __init
static_proto_init(void)
{
add_proto_handler(&static_proto);
}
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