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#include "device.h"
#include "keywords.h"
#include "util.h"
#include "vector.h"
#include <arpa/inet.h>
#include <netinet/ether.h>
#include <netinet/in.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
static device_type_t device_type_interface;
typedef struct _ipaddr {
int af;
union {
struct in_addr addr4;
struct in6_addr addr6;
};
} ipaddr_t;
typedef struct _ipprefix {
ipaddr_t addr;
uint8_t plen;
} ipaddr_prefix_t;
typedef VECTOR(ipaddr_prefix_t) ipaddr_prefix_vector_t;
typedef struct _device_interface {
device_t device;
struct ether_addr macaddr;
uint16_t mtu;
ipaddr_prefix_vector_t addrs;
} device_interface_t;
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_interface_t *iface, const ini_section_t *section) {
ini_field_t *field;
list_for_each_entry(field, §ion->fields, node) {
switch (lookup_keyword(field->key)) {
default:
fprintf(stderr, "interface: [Device]: unknown field %s\n", field->key);
}
}
return true;
}
static bool process_section_static(device_interface_t *iface, const ini_section_t *section) {
ini_field_t *field;
list_for_each_entry(field, §ion->fields, node) {
switch (lookup_keyword(field->key)) {
case KW_Address: {
ipaddr_prefix_t p;
if (!parse_prefix(&p, field->value, true)) {
fprintf(stderr, "interface: [Static]: unable to parse Address %s\n", field->value);
break;
}
if (!VECTOR_ADD(iface->addrs, p)) {
fprintf(stderr, "interface: [Static]: adding address failed\n");
return false;
}
break;
}
default:
fprintf(stderr, "interface: [Static]: unknown field %s\n", field->key);
}
}
return true;
}
static void interface_free_device(device_t *dev) {
device_interface_t *iface = container_of(dev, device_interface_t, device);
VECTOR_FREE(iface->addrs);
free(NODE_NAME(dev));
free(iface);
}
static device_t * interface_process_config(const char *name, const ini_file_t *config) {
device_interface_t *iface = calloc(1, sizeof(*iface));
if (!iface)
return NULL;
device_t *dev = &iface->device;
dev->type = &device_type_interface;
NODE_NAME(dev) = strdup(name);
if (!NODE_NAME(dev)) {
free(iface);
return NULL;
}
const ini_section_t *section;
list_for_each_entry(section, &config->sections, node) {
switch (lookup_keyword(section->name)) {
case KW_Device:
if (!process_section_device(iface, section))
goto err;
break;
case KW_Static:
if (!process_section_static(iface, section))
goto err;
break;
default:
fprintf(stderr, "interface: unknown section %s\n", section->name);
}
}
return dev;
err:
interface_free_device(dev);
return NULL;
}
static device_type_t device_type_interface = {
.process_config = interface_process_config,
.free_device = interface_free_device,
};
__attribute__((constructor))
static void interface_constructor(void) {
register_device_type("interface", &device_type_interface);
}
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