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Systemd/src/libsystemd-network/network-internal.c
Lennart Poettering 5d13a15b1d tree-wide: drop spurious newlines (#8764) 
Double newlines (i.e. one empty lines) are great to structure code. But
let's avoid triple newlines (i.e. two empty lines), quadruple newlines,
quintuple newlines, …, that's just spurious whitespace.

It's an easy way to drop 121 lines of code, and keeps the coding style
of our sources a bit tigther.
2018-04-19 12:13:23 +02:00

602 lines
17 KiB
C
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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
***/
#include <arpa/inet.h>
#include <linux/if.h>
#include <netinet/ether.h>
#include "sd-id128.h"
#include "sd-ndisc.h"
#include "alloc-util.h"
#include "condition.h"
#include "conf-parser.h"
#include "dhcp-lease-internal.h"
#include "ether-addr-util.h"
#include "hexdecoct.h"
#include "log.h"
#include "network-internal.h"
#include "parse-util.h"
#include "siphash24.h"
#include "socket-util.h"
#include "string-util.h"
#include "strv.h"
#include "utf8.h"
#include "util.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, uint64_t *result) {
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. */
*result = htole64(siphash24(v, sz, HASH_KEY.bytes));
return 0;
}
static bool net_condition_test_strv(char * const *raw_patterns,
const char *string) {
if (strv_isempty(raw_patterns))
return true;
/* If the patterns begin with "!", edit it out and negate the test. */
if (raw_patterns[0][0] == '!') {
char **patterns;
unsigned i, length;
length = strv_length(raw_patterns) + 1; /* Include the NULL. */
patterns = newa(char*, length);
patterns[0] = raw_patterns[0] + 1; /* Skip the "!". */
for (i = 1; i < length; i++)
patterns[i] = raw_patterns[i];
return !string || !strv_fnmatch(patterns, string, 0);
}
return string && strv_fnmatch(raw_patterns, string, 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_cmdline,
Condition *match_kernel_version,
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) <= 0)
return false;
if (match_virt && condition_test(match_virt) <= 0)
return false;
if (match_kernel_cmdline && condition_test(match_kernel_cmdline) <= 0)
return false;
if (match_kernel_version && condition_test(match_kernel_version) <= 0)
return false;
if (match_arch && condition_test(match_arch) <= 0)
return false;
if (match_mac && (!dev_mac || memcmp(match_mac, dev_mac, ETH_ALEN)))
return false;
if (!net_condition_test_strv(match_paths, dev_path))
return false;
if (!net_condition_test_strv(match_drivers, dev_driver))
return false;
if (!net_condition_test_strv(match_types, dev_type))
return false;
if (!net_condition_test_strv(match_names, dev_name))
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_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;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
for (;;) {
_cleanup_free_ char *word = NULL;
r = extract_first_word(&rvalue, &word, NULL, 0);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse interface name list: %s", rvalue);
return 0;
}
if (r == 0)
break;
if (!ifname_valid(word)) {
log_syntax(unit, LOG_ERR, filename, line, 0, "Interface name is not valid or too long, ignoring assignment: %s", rvalue);
return 0;
}
r = strv_push(sv, word);
if (r < 0)
return log_oom();
word = NULL;
}
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 = TAKE_PTR(n);
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;
const char *start;
size_t offset;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
n = new0(struct ether_addr, 1);
if (!n)
return log_oom();
start = rvalue + strspn(rvalue, WHITESPACE);
r = ether_addr_from_string(start, n, &offset);
if (r || (start[offset + strspn(start + offset, WHITESPACE)] != '\0')) {
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;
}
int config_parse_iaid(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) {
uint32_t iaid;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
r = safe_atou32(rvalue, &iaid);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Unable to read IAID, ignoring assignment: %s", rvalue);
return 0;
}
*((uint32_t *)data) = iaid;
return 0;
}
int config_parse_bridge_port_priority(
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) {
uint16_t i;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
r = safe_atou16(rvalue, &i);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to parse bridge port priority, ignoring: %s", rvalue);
return 0;
}
if (i > LINK_BRIDGE_PORT_PRIORITY_MAX) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Bridge port priority is larger than maximum %u, ignoring: %s", LINK_BRIDGE_PORT_PRIORITY_MAX, rvalue);
return 0;
}
*((uint16_t *)data) = i;
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;
assert(ret);
assert(string);
for (;;) {
_cleanup_free_ char *word = NULL;
struct in_addr *new_addresses;
int r;
r = extract_first_word(&string, &word, NULL, 0);
if (r < 0)
return r;
if (r == 0)
break;
new_addresses = reallocarray(addresses, size + 1, sizeof(struct in_addr));
if (!new_addresses)
return -ENOMEM;
else
addresses = new_addresses;
r = inet_pton(AF_INET, word, &(addresses[size]));
if (r <= 0)
continue;
size++;
}
*ret = TAKE_PTR(addresses);
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++) {
char buffer[INET6_ADDRSTRLEN];
fputs(inet_ntop(AF_INET6, addresses+i, buffer, sizeof(buffer)), f);
if (i < size - 1)
fputc(' ', f);
}
}
int deserialize_in6_addrs(struct in6_addr **ret, const char *string) {
_cleanup_free_ struct in6_addr *addresses = NULL;
int size = 0;
assert(ret);
assert(string);
for (;;) {
_cleanup_free_ char *word = NULL;
struct in6_addr *new_addresses;
int r;
r = extract_first_word(&string, &word, NULL, 0);
if (r < 0)
return r;
if (r == 0)
break;
new_addresses = reallocarray(addresses, size + 1, sizeof(struct in6_addr));
if (!new_addresses)
return -ENOMEM;
else
addresses = new_addresses;
r = inet_pton(AF_INET6, word, &(addresses[size]));
if (r <= 0)
continue;
size++;
}
*ret = TAKE_PTR(addresses);
return size;
}
void serialize_dhcp_routes(FILE *f, const char *key, 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++) {
struct in_addr dest, gw;
uint8_t length;
assert_se(sd_dhcp_route_get_destination(routes[i], &dest) >= 0);
assert_se(sd_dhcp_route_get_gateway(routes[i], &gw) >= 0);
assert_se(sd_dhcp_route_get_destination_prefix_length(routes[i], &length) >= 0);
fprintf(f, "%s/%" PRIu8, inet_ntoa(dest), length);
fprintf(f, ",%s%s", inet_ntoa(gw), (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;
assert(ret);
assert(ret_size);
assert(ret_allocated);
assert(string);
/* WORD FORMAT: dst_ip/dst_prefixlen,gw_ip */
for (;;) {
_cleanup_free_ char *word = NULL;
char *tok, *tok_end;
unsigned n;
int r;
r = extract_first_word(&string, &word, NULL, 0);
if (r < 0)
return r;
if (r == 0)
break;
if (!GREEDY_REALLOC(routes, allocated, size + 1))
return -ENOMEM;
tok = word;
/* 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 = TAKE_PTR(routes);
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);
}
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