network-internal.c revision 3ad0c5d8a4e2e2fa7ffcccd7f3457f577908494e
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <netinet/ether.h>
#include <linux/if.h>
#include <arpa/inet.h>
#include "strv.h"
#include "siphash24.h"
#include "dhcp-lease-internal.h"
#include "log.h"
#include "utf8.h"
#include "util.h"
#include "conf-parser.h"
#include "condition.h"
#include "network-internal.h"
#include "sd-ndisc.h"
const char *net_get_name(struct udev_device *device) {
const char *name, *field;
assert(device);
/* fetch some persistent data unique (on this machine) to this device */
FOREACH_STRING(field, "ID_NET_NAME_ONBOARD", "ID_NET_NAME_SLOT", "ID_NET_NAME_PATH", "ID_NET_NAME_MAC") {
name = udev_device_get_property_value(device, field);
if (name)
return name;
}
return NULL;
}
#define HASH_KEY SD_ID128_MAKE(d3,1e,48,fa,90,fe,4b,4c,9d,af,d5,d7,a1,b1,2e,8a)
int net_get_unique_predictable_data(struct udev_device *device, uint8_t result[8]) {
size_t l, sz = 0;
const char *name = NULL;
int r;
uint8_t *v;
assert(device);
name = net_get_name(device);
if (!name)
return -ENOENT;
l = strlen(name);
sz = sizeof(sd_id128_t) + l;
v = alloca(sz);
/* fetch some persistent data unique to this machine */
r = sd_id128_get_machine((sd_id128_t*) v);
if (r < 0)
return r;
memcpy(v + sizeof(sd_id128_t), name, l);
/* Let's hash the machine ID plus the device name. We
* use a fixed, but originally randomly created hash
* key here. */
siphash24(result, v, sz, HASH_KEY.bytes);
return 0;
}
bool net_match_config(const struct ether_addr *match_mac,
char * const *match_paths,
char * const *match_drivers,
char * const *match_types,
char * const *match_names,
Condition *match_host,
Condition *match_virt,
Condition *match_kernel,
Condition *match_arch,
const struct ether_addr *dev_mac,
const char *dev_path,
const char *dev_parent_driver,
const char *dev_driver,
const char *dev_type,
const char *dev_name) {
if (match_host && !condition_test(match_host))
return false;
if (match_virt && !condition_test(match_virt))
return false;
if (match_kernel && !condition_test(match_kernel))
return false;
if (match_arch && !condition_test(match_arch))
return false;
if (match_mac && (!dev_mac || memcmp(match_mac, dev_mac, ETH_ALEN)))
return false;
if (!strv_isempty(match_paths) &&
(!dev_path || !strv_fnmatch(match_paths, dev_path, 0)))
return false;
if (!strv_isempty(match_drivers) &&
(!dev_driver || !strv_fnmatch(match_drivers, dev_driver, 0)))
return false;
if (!strv_isempty(match_types) &&
(!dev_type || !strv_fnmatch_or_empty(match_types, dev_type, 0)))
return false;
if (!strv_isempty(match_names) &&
(!dev_name || !strv_fnmatch_or_empty(match_names, dev_name, 0)))
return false;
return true;
}
int config_parse_net_condition(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
ConditionType cond = ltype;
Condition **ret = data;
bool negate;
Condition *c;
_cleanup_free_ char *s = NULL;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
negate = rvalue[0] == '!';
if (negate)
rvalue++;
s = strdup(rvalue);
if (!s)
return log_oom();
c = condition_new(cond, s, false, negate);
if (!c)
return log_oom();
if (*ret)
condition_free(*ret);
*ret = c;
return 0;
}
int config_parse_ifname(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
char **s = data;
_cleanup_free_ char *n = NULL;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
n = strdup(rvalue);
if (!n)
return log_oom();
if (!ascii_is_valid(n) || strlen(n) >= IFNAMSIZ) {
log_syntax(unit, LOG_ERR, filename, line, 0, "Interface name is not ASCII clean or is too long, ignoring assignment: %s", rvalue);
return 0;
}
free(*s);
if (*n) {
*s = n;
n = NULL;
} else
*s = NULL;
return 0;
}
int config_parse_ifnames(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
char ***sv = data;
const char *word, *state;
size_t l;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
FOREACH_WORD(word, l, rvalue, state) {
char *n;
n = strndup(word, l);
if (!n)
return log_oom();
if (!ascii_is_valid(n) || strlen(n) >= IFNAMSIZ) {
log_syntax(unit, LOG_ERR, filename, line, 0, "Interface name is not ASCII clean or is too long, ignoring assignment: %s", rvalue);
free(n);
return 0;
}
r = strv_consume(sv, n);
if (r < 0)
return log_oom();
}
return 0;
}
int config_parse_ifalias(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
char **s = data;
_cleanup_free_ char *n = NULL;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
n = strdup(rvalue);
if (!n)
return log_oom();
if (!ascii_is_valid(n) || strlen(n) >= IFALIASZ) {
log_syntax(unit, LOG_ERR, filename, line, 0, "Interface alias is not ASCII clean or is too long, ignoring assignment: %s", rvalue);
return 0;
}
free(*s);
if (*n) {
*s = n;
n = NULL;
} else
*s = NULL;
return 0;
}
int config_parse_hwaddr(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
struct ether_addr **hwaddr = data;
struct ether_addr *n;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
n = new0(struct ether_addr, 1);
if (!n)
return log_oom();
r = sscanf(rvalue, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
&n->ether_addr_octet[0],
&n->ether_addr_octet[1],
&n->ether_addr_octet[2],
&n->ether_addr_octet[3],
&n->ether_addr_octet[4],
&n->ether_addr_octet[5]);
if (r != 6) {
log_syntax(unit, LOG_ERR, filename, line, 0, "Not a valid MAC address, ignoring assignment: %s", rvalue);
free(n);
return 0;
}
free(*hwaddr);
*hwaddr = n;
return 0;
}
void serialize_in_addrs(FILE *f, const struct in_addr *addresses, size_t size) {
unsigned i;
assert(f);
assert(addresses);
assert(size);
for (i = 0; i < size; i++)
fprintf(f, "%s%s", inet_ntoa(addresses[i]),
(i < (size - 1)) ? " ": "");
}
int deserialize_in_addrs(struct in_addr **ret, const char *string) {
_cleanup_free_ struct in_addr *addresses = NULL;
int size = 0;
const char *word, *state;
size_t len;
assert(ret);
assert(string);
FOREACH_WORD(word, len, string, state) {
_cleanup_free_ char *addr_str = NULL;
struct in_addr *new_addresses;
int r;
new_addresses = realloc(addresses, (size + 1) * sizeof(struct in_addr));
if (!new_addresses)
return -ENOMEM;
else
addresses = new_addresses;
addr_str = strndup(word, len);
if (!addr_str)
return -ENOMEM;
r = inet_pton(AF_INET, addr_str, &(addresses[size]));
if (r <= 0)
continue;
size ++;
}
*ret = addresses;
addresses = NULL;
return size;
}
void serialize_in6_addrs(FILE *f, const struct in6_addr *addresses,
size_t size) {
unsigned i;
assert(f);
assert(addresses);
assert(size);
for (i = 0; i < size; i++)
fprintf(f, SD_ICMP6_ND_ADDRESS_FORMAT_STR"%s",
SD_ICMP6_ND_ADDRESS_FORMAT_VAL(addresses[i]),
(i < (size - 1)) ? " ": "");
}
int deserialize_in6_addrs(struct in6_addr **ret, const char *string) {
_cleanup_free_ struct in6_addr *addresses = NULL;
int size = 0;
const char *word, *state;
size_t len;
assert(ret);
assert(string);
FOREACH_WORD(word, len, string, state) {
_cleanup_free_ char *addr_str = NULL;
struct in6_addr *new_addresses;
int r;
new_addresses = realloc(addresses, (size + 1) * sizeof(struct in6_addr));
if (!new_addresses)
return -ENOMEM;
else
addresses = new_addresses;
addr_str = strndup(word, len);
if (!addr_str)
return -ENOMEM;
r = inet_pton(AF_INET6, addr_str, &(addresses[size]));
if (r <= 0)
continue;
size++;
}
*ret = addresses;
addresses = NULL;
return size;
}
void serialize_dhcp_routes(FILE *f, const char *key, struct sd_dhcp_route *routes, size_t size) {
unsigned i;
assert(f);
assert(key);
assert(routes);
assert(size);
fprintf(f, "%s=", key);
for (i = 0; i < size; i++) {
fprintf(f, "%s/%" PRIu8, inet_ntoa(routes[i].dst_addr),
routes[i].dst_prefixlen);
fprintf(f, ",%s%s", inet_ntoa(routes[i].gw_addr),
(i < (size - 1)) ? " ": "");
}
fputs("\n", f);
}
int deserialize_dhcp_routes(struct sd_dhcp_route **ret, size_t *ret_size, size_t *ret_allocated, const char *string) {
_cleanup_free_ struct sd_dhcp_route *routes = NULL;
size_t size = 0, allocated = 0;
const char *word, *state;
size_t len;
assert(ret);
assert(ret_size);
assert(ret_allocated);
assert(string);
FOREACH_WORD(word, len, string, state) {
/* WORD FORMAT: dst_ip/dst_prefixlen,gw_ip */
_cleanup_free_ char* entry = NULL;
char *tok, *tok_end;
unsigned n;
int r;
if (!GREEDY_REALLOC(routes, allocated, size + 1))
return -ENOMEM;
entry = strndup(word, len);
if(!entry)
return -ENOMEM;
tok = entry;
/* get the subnet */
tok_end = strchr(tok, '/');
if (!tok_end)
continue;
*tok_end = '\0';
r = inet_aton(tok, &routes[size].dst_addr);
if (r == 0)
continue;
tok = tok_end + 1;
/* get the prefixlen */
tok_end = strchr(tok, ',');
if (!tok_end)
continue;
*tok_end = '\0';
r = safe_atou(tok, &n);
if (r < 0 || n > 32)
continue;
routes[size].dst_prefixlen = (uint8_t) n;
tok = tok_end + 1;
/* get the gateway */
r = inet_aton(tok, &routes[size].gw_addr);
if (r == 0)
continue;
size++;
}
*ret_size = size;
*ret_allocated = allocated;
*ret = routes;
routes = NULL;
return 0;
}
int serialize_dhcp_option(FILE *f, const char *key, const void *data, size_t size) {
_cleanup_free_ char *hex_buf = NULL;
assert(f);
assert(key);
assert(data);
hex_buf = hexmem(data, size);
if (hex_buf == NULL)
return -ENOMEM;
fprintf(f, "%s=%s\n", key, hex_buf);
return 0;
}
int deserialize_dhcp_option(void **data, size_t *data_len, const char *string) {
assert(data);
assert(data_len);
assert(string);
if (strlen(string) % 2)
return -EINVAL;
return unhexmem(string, strlen(string), (void **)data, data_len);
}