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#include "device-common.h"
#include "netlink.h"
#include "util.h"
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <linux/if.h>
#include <linux/if_link.h>
#include <linux/rtnetlink.h>
static unsigned long strtoul_safe(const char *str) {
char *endptr;
errno = 0;
unsigned long val = strtoul(str, &endptr, 10);
if (endptr == str || *endptr)
errno = EINVAL;
return val;
}
static bool parse_address(ipaddr_t *addr, const char *str) {
if (inet_pton(AF_INET, str, &addr->addr4)) {
addr->af = AF_INET;
return true;
}
if (inet_pton(AF_INET6, str, &addr->addr6)) {
addr->af = AF_INET6;
return true;
}
return false;
}
static bool parse_prefix(ipaddr_prefix_t *prefix, const char *str, bool allow_host) {
const char *slash = strrchr(str, '/');
if (!slash)
return false;
size_t len = slash - str;
char buf[len+1];
memcpy(buf, str, len);
buf[len] = 0;
if (!parse_address(&prefix->addr, buf))
return false;
long plen = strtoul_safe(slash + 1);
if (errno)
return false;
switch (prefix->addr.af) {
case AF_INET:
if (plen > 32)
return false;
break;
case AF_INET6:
if (plen > 128)
return false;
break;
default:
assert(false);
__builtin_unreachable();
}
prefix->plen = plen;
// TODO: Implement allow_host
return true;
}
static bool process_section_device(device_common_t *device, struct json_object *section) {
return true;
}
static bool process_section_static(device_common_t *device, struct json_object *section) {
struct json_object *addresses = neco_json_get_value(section, "addresses", json_type_array);
if (addresses) {
for (size_t i = 0; i < json_object_array_length(addresses); i++) {
struct json_object *address = json_object_array_get_idx(addresses, i);
if (!json_object_is_type(address, json_type_string)) {
fprintf(stderr, "interface: static: invalid address entry of type %s\n", json_type_to_name(json_object_get_type(address)));
continue;
}
ipaddr_prefix_t p;
if (!parse_prefix(&p, json_object_get_string(address), true)) {
fprintf(stderr, "interface: static: unable to parse Address %s\n", json_object_get_string(address));
break;
}
if (!VECTOR_ADD(device->addrs, p)) {
fprintf(stderr, "interface: static: adding address failed\n");
return false;
}
}
}
return true;
}
bool device_common_process_config(device_common_t *device, struct json_object *config) {
struct json_object *sec_device = neco_json_get_value(config, "device", json_type_object);
if (sec_device) {
if (!process_section_device(device, sec_device))
return false;
}
struct json_object *sec_static = neco_json_get_value(config, "static", json_type_object);
if (sec_static) {
if (!process_section_static(device, sec_static))
return false;
}
return true;
}
static bool device_common_set_link_flags(unsigned ifindex, unsigned change, unsigned flags) {
char buf[MNL_SOCKET_BUFFER_SIZE];
struct mnl_socket *nl = nl_socket();
struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf);
nlh->nlmsg_type = RTM_SETLINK;
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
int seq = nlh->nlmsg_seq = nl_seq();
struct ifinfomsg *ifi = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifi));
ifi->ifi_index = ifindex;
ifi->ifi_family = AF_UNSPEC;
ifi->ifi_change = change;
ifi->ifi_flags = flags;
if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
perror("mnl_socket_sendto");
return false;
}
int ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
if (ret == -1) {
perror("mnl_socket_recvfrom");
return false;
}
ret = mnl_cb_run(buf, ret, seq, mnl_socket_get_portid(nl), NULL, NULL);
if (ret == -1) {
perror("mnl_cb_run");
return false;
}
return true;
}
static bool device_common_set_link_state(unsigned ifindex, bool up) {
return device_common_set_link_flags(ifindex, IFF_UP, up ? IFF_UP : 0);
}
static bool device_common_set_ipaddr(unsigned ifindex, ipaddr_prefix_t *addr, bool add) {
char buf[MNL_SOCKET_BUFFER_SIZE];
struct mnl_socket *nl = nl_socket();
struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf);
nlh->nlmsg_type = add ? RTM_NEWADDR : RTM_DELADDR;
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
if (add)
nlh->nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE;
int seq = nlh->nlmsg_seq = nl_seq();
struct ifaddrmsg *ifa = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifa));
ifa->ifa_index = ifindex;
ifa->ifa_family = addr->addr.af;
ifa->ifa_prefixlen = addr->plen;
switch (addr->addr.af) {
case AF_INET:
mnl_attr_put(nlh, IFA_LOCAL, 4, &addr->addr.addr4);
break;
case AF_INET6:
mnl_attr_put(nlh, IFA_LOCAL, 16, &addr->addr.addr6);
break;
default:
errno = EINVAL;
return false;
}
if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
perror("mnl_socket_sendto");
return false;
}
int ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
if (ret == -1) {
perror("mnl_socket_recvfrom");
return false;
}
ret = mnl_cb_run(buf, ret, seq, mnl_socket_get_portid(nl), NULL, NULL);
if (ret == -1) {
perror("mnl_cb_run");
return false;
}
return true;
}
void device_common_init(device_common_t *device, int ifindex) {
device_common_set_link_state(ifindex, true);
for (size_t i = 0; i < VECTOR_LEN(device->addrs); i++)
device_common_set_ipaddr(ifindex, &VECTOR_INDEX(device->addrs, i), true);
}
void device_common_release(device_common_t *device, int ifindex) {
for (size_t i = 0; i < VECTOR_LEN(device->addrs); i++)
device_common_set_ipaddr(ifindex, &VECTOR_INDEX(device->addrs, i), false);
device_common_set_link_state(ifindex, false);
}
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