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sd-network: move net_get_unique_predictable_data() and net_get_name_persisten()

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This commit is contained in:
Yu Watanabe 2020-10-29 01:04:08 +09:00
parent c2f781bc15
commit dc7f6c9b94
6 changed files with 63 additions and 61 deletions
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3
src/libsystemd-network/dhcp-identifier.c
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@ -1,6 +1,7 @@
/* SPDX-License-Identifier: LGPL-2.1+ */
#include <linux/if_infiniband.h>
#include <net/ethernet.h>
#include <net/if_arp.h>
#include "sd-device.h"
@ -8,7 +9,7 @@
#include "dhcp-identifier.h"
#include "dhcp6-protocol.h"
#include "network-internal.h"
#include "network-util.h"
#include "siphash24.h"
#include "sparse-endian.h"
#include "stdio-util.h"

56
src/libsystemd-network/network-internal.c
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@ -4,69 +4,15 @@
#include <linux/if.h>
#include <netinet/ether.h>
#include "sd-id128.h"
#include "sd-ndisc.h"
#include "alloc-util.h"
#include "device-util.h"
#include "dhcp-lease-internal.h"
#include "extract-word.h"
#include "hexdecoct.h"
#include "log.h"
#include "network-internal.h"
#include "network-util.h"
#include "parse-util.h"
#include "siphash24.h"
#include "strv.h"
#include "util.h"
const char *net_get_name_persistent(sd_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")
if (sd_device_get_property_value(device, field, &name) >= 0)
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(sd_device *device, bool use_sysname, uint64_t *result) {
size_t l, sz = 0;
const char *name;
int r;
uint8_t *v;
assert(device);
/* net_get_name_persistent() will return one of the device names based on stable information about
* the device. If this is not available, we fall back to using the actual device name. */
name = net_get_name_persistent(device);
if (!name && use_sysname)
(void) sd_device_get_sysname(device, &name);
if (!name)
return log_device_debug_errno(device, SYNTHETIC_ERRNO(ENODATA),
"No stable identifying information found");
log_device_debug(device, "Using \"%s\" as stable identifying information", name);
l = strlen(name);
sz = sizeof(sd_id128_t) + l;
v = newa(uint8_t, 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. */
*result = htole64(siphash24(v, sz, HASH_KEY.bytes));
return 0;
}
size_t serialize_in_addrs(FILE *f,
const struct in_addr *addresses,

4
src/libsystemd-network/network-internal.h
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@ -4,12 +4,8 @@
#include <stdbool.h>
#include <stdio.h>
#include "sd-device.h"
#include "sd-dhcp-lease.h"
int net_get_unique_predictable_data(sd_device *device, bool use_sysname, uint64_t *result);
const char *net_get_name_persistent(sd_device *device);
size_t serialize_in_addrs(FILE *f,
const struct in_addr *addresses,
size_t size,

54
src/libsystemd/sd-network/network-util.c
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@ -1,9 +1,14 @@
/* SPDX-License-Identifier: LGPL-2.1+ */
#include "sd-id128.h"
#include "alloc-util.h"
#include "arphrd-list.h"
#include "device-util.h"
#include "fd-util.h"
#include "network-util.h"
#include "siphash24.h"
#include "sparse-endian.h"
#include "string-table.h"
#include "strv.h"
@ -124,3 +129,52 @@ char *link_get_type_string(sd_device *device, unsigned short iftype) {
return ascii_strlower(p);
}
const char *net_get_name_persistent(sd_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")
if (sd_device_get_property_value(device, field, &name) >= 0)
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(sd_device *device, bool use_sysname, uint64_t *result) {
size_t l, sz = 0;
const char *name;
int r;
uint8_t *v;
assert(device);
/* net_get_name_persistent() will return one of the device names based on stable information about
* the device. If this is not available, we fall back to using the actual device name. */
name = net_get_name_persistent(device);
if (!name && use_sysname)
(void) sd_device_get_sysname(device, &name);
if (!name)
return log_device_debug_errno(device, SYNTHETIC_ERRNO(ENODATA),
"No stable identifying information found");
log_device_debug(device, "Using \"%s\" as stable identifying information", name);
l = strlen(name);
sz = sizeof(sd_id128_t) + l;
v = newa(uint8_t, 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. */
*result = htole64(siphash24(v, sz, HASH_KEY.bytes));
return 0;
}

5
src/libsystemd/sd-network/network-util.h
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@ -1,6 +1,9 @@
/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once
#include <inttypes.h>
#include <stdbool.h>
#include "sd-device.h"
#include "sd-network.h"
@ -61,3 +64,5 @@ typedef struct LinkOperationalStateRange {
int parse_operational_state_range(const char *str, LinkOperationalStateRange *out);
char *link_get_type_string(sd_device *device, unsigned short iftype);
int net_get_unique_predictable_data(sd_device *device, bool use_sysname, uint64_t *result);
const char *net_get_name_persistent(sd_device *device);

2
src/udev/net/link-config.c
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@ -21,7 +21,7 @@
#include "net-condition.h"
#include "netif-naming-scheme.h"
#include "netlink-util.h"
#include "network-internal.h"
#include "network-util.h"
#include "parse-util.h"
#include "path-lookup.h"
#include "path-util.h"