646 lines
23 KiB
C
646 lines
23 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
|
|
|
|
#include "sd-dhcp-server.h"
|
|
|
|
#include "escape.h"
|
|
#include "networkd-dhcp-server.h"
|
|
#include "networkd-link.h"
|
|
#include "networkd-manager.h"
|
|
#include "networkd-network.h"
|
|
#include "parse-util.h"
|
|
#include "strv.h"
|
|
#include "string-table.h"
|
|
#include "string-util.h"
|
|
|
|
static Address* link_find_dhcp_server_address(Link *link) {
|
|
Address *address;
|
|
|
|
assert(link);
|
|
assert(link->network);
|
|
|
|
/* The first statically configured address if there is any */
|
|
LIST_FOREACH(addresses, address, link->network->static_addresses) {
|
|
|
|
if (address->family != AF_INET)
|
|
continue;
|
|
|
|
if (in_addr_is_null(address->family, &address->in_addr))
|
|
continue;
|
|
|
|
return address;
|
|
}
|
|
|
|
/* If that didn't work, find a suitable address we got from the pool */
|
|
LIST_FOREACH(addresses, address, link->pool_addresses) {
|
|
if (address->family != AF_INET)
|
|
continue;
|
|
|
|
return address;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
|
|
_cleanup_free_ struct in_addr *addresses = NULL;
|
|
size_t n_addresses = 0, n_allocated = 0;
|
|
unsigned i;
|
|
|
|
log_debug("Copying DNS server information from %s", link->ifname);
|
|
|
|
if (!link->network)
|
|
return 0;
|
|
|
|
for (i = 0; i < link->network->n_dns; i++) {
|
|
struct in_addr ia;
|
|
|
|
/* Only look for IPv4 addresses */
|
|
if (link->network->dns[i].family != AF_INET)
|
|
continue;
|
|
|
|
ia = link->network->dns[i].address.in;
|
|
|
|
/* Never propagate obviously borked data */
|
|
if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
|
|
continue;
|
|
|
|
if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
|
|
return log_oom();
|
|
|
|
addresses[n_addresses++] = ia;
|
|
}
|
|
|
|
if (link->network->dhcp_use_dns && link->dhcp_lease) {
|
|
const struct in_addr *da = NULL;
|
|
int j, n;
|
|
|
|
n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
|
|
if (n > 0) {
|
|
|
|
if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
|
|
return log_oom();
|
|
|
|
for (j = 0; j < n; j++)
|
|
if (in4_addr_is_non_local(&da[j]))
|
|
addresses[n_addresses++] = da[j];
|
|
}
|
|
}
|
|
|
|
if (n_addresses <= 0)
|
|
return 0;
|
|
|
|
return sd_dhcp_server_set_dns(s, addresses, n_addresses);
|
|
}
|
|
|
|
static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
|
|
_cleanup_free_ struct in_addr *addresses = NULL;
|
|
size_t n_addresses = 0, n_allocated = 0;
|
|
char **a;
|
|
|
|
if (!link->network)
|
|
return 0;
|
|
|
|
log_debug("Copying NTP server information from %s", link->ifname);
|
|
|
|
STRV_FOREACH(a, link->network->ntp) {
|
|
union in_addr_union ia;
|
|
|
|
/* Only look for IPv4 addresses */
|
|
if (in_addr_from_string(AF_INET, *a, &ia) <= 0)
|
|
continue;
|
|
|
|
/* Never propagate obviously borked data */
|
|
if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in))
|
|
continue;
|
|
|
|
if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
|
|
return log_oom();
|
|
|
|
addresses[n_addresses++] = ia.in;
|
|
}
|
|
|
|
if (link->network->dhcp_use_ntp && link->dhcp_lease) {
|
|
const struct in_addr *da = NULL;
|
|
int j, n;
|
|
|
|
n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
|
|
if (n > 0) {
|
|
|
|
if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
|
|
return log_oom();
|
|
|
|
for (j = 0; j < n; j++)
|
|
if (in4_addr_is_non_local(&da[j]))
|
|
addresses[n_addresses++] = da[j];
|
|
}
|
|
}
|
|
|
|
if (n_addresses <= 0)
|
|
return 0;
|
|
|
|
return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
|
|
}
|
|
|
|
static int link_push_uplink_sip_to_dhcp_server(Link *link, sd_dhcp_server *s) {
|
|
_cleanup_free_ struct in_addr *addresses = NULL;
|
|
size_t n_addresses = 0, n_allocated = 0;
|
|
char **a;
|
|
|
|
if (!link->network)
|
|
return 0;
|
|
|
|
log_debug("Copying SIP server information from %s", link->ifname);
|
|
|
|
STRV_FOREACH(a, link->network->sip) {
|
|
union in_addr_union ia;
|
|
|
|
/* Only look for IPv4 addresses */
|
|
if (in_addr_from_string(AF_INET, *a, &ia) <= 0)
|
|
continue;
|
|
|
|
/* Never propagate obviously borked data */
|
|
if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in))
|
|
continue;
|
|
|
|
if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
|
|
return log_oom();
|
|
|
|
addresses[n_addresses++] = ia.in;
|
|
}
|
|
|
|
if (link->network->dhcp_use_sip && link->dhcp_lease) {
|
|
const struct in_addr *da = NULL;
|
|
int j, n;
|
|
|
|
n = sd_dhcp_lease_get_sip(link->dhcp_lease, &da);
|
|
if (n > 0) {
|
|
|
|
if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
|
|
return log_oom();
|
|
|
|
for (j = 0; j < n; j++)
|
|
if (in4_addr_is_non_local(&da[j]))
|
|
addresses[n_addresses++] = da[j];
|
|
}
|
|
}
|
|
|
|
if (n_addresses <= 0)
|
|
return 0;
|
|
|
|
return sd_dhcp_server_set_sip(s, addresses, n_addresses);
|
|
}
|
|
|
|
int dhcp4_server_configure(Link *link) {
|
|
bool acquired_uplink = false;
|
|
sd_dhcp_raw_option *p;
|
|
Link *uplink = NULL;
|
|
Address *address;
|
|
Iterator i;
|
|
int r;
|
|
|
|
address = link_find_dhcp_server_address(link);
|
|
if (!address)
|
|
return log_link_error_errno(link, SYNTHETIC_ERRNO(EBUSY),
|
|
"Failed to find suitable address for DHCPv4 server instance.");
|
|
|
|
/* use the server address' subnet as the pool */
|
|
r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
|
|
link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
|
|
if (r < 0)
|
|
return log_link_error_errno(link, r, "Failed to configure address pool for DHCPv4 server instance: %m");
|
|
|
|
/* TODO:
|
|
r = sd_dhcp_server_set_router(link->dhcp_server, &main_address->in_addr.in);
|
|
if (r < 0)
|
|
return r;
|
|
*/
|
|
|
|
if (link->network->dhcp_server_max_lease_time_usec > 0) {
|
|
r = sd_dhcp_server_set_max_lease_time(link->dhcp_server,
|
|
DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
|
|
if (r < 0)
|
|
return log_link_error_errno(link, r, "Failed to set maximum lease time for DHCPv4 server instance: %m");
|
|
}
|
|
|
|
if (link->network->dhcp_server_default_lease_time_usec > 0) {
|
|
r = sd_dhcp_server_set_default_lease_time(link->dhcp_server,
|
|
DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
|
|
if (r < 0)
|
|
return log_link_error_errno(link, r, "Failed to set default lease time for DHCPv4 server instance: %m");
|
|
}
|
|
|
|
if (link->network->dhcp_server_emit_dns) {
|
|
if (link->network->n_dhcp_server_dns > 0)
|
|
r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
|
|
else {
|
|
uplink = manager_find_uplink(link->manager, link);
|
|
acquired_uplink = true;
|
|
|
|
if (!uplink) {
|
|
log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
|
|
r = 0;
|
|
} else
|
|
r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
|
|
}
|
|
if (r < 0)
|
|
log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
|
|
}
|
|
|
|
if (link->network->dhcp_server_emit_ntp) {
|
|
if (link->network->n_dhcp_server_ntp > 0)
|
|
r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
|
|
else {
|
|
if (!acquired_uplink)
|
|
uplink = manager_find_uplink(link->manager, link);
|
|
|
|
if (!uplink) {
|
|
log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
|
|
r = 0;
|
|
} else
|
|
r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
|
|
|
|
}
|
|
if (r < 0)
|
|
log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
|
|
}
|
|
|
|
if (link->network->dhcp_server_emit_sip) {
|
|
if (link->network->n_dhcp_server_sip > 0)
|
|
r = sd_dhcp_server_set_sip(link->dhcp_server, link->network->dhcp_server_sip, link->network->n_dhcp_server_sip);
|
|
else {
|
|
if (!acquired_uplink)
|
|
uplink = manager_find_uplink(link->manager, link);
|
|
|
|
if (!uplink) {
|
|
log_link_debug(link, "Not emitting sip server information on link, couldn't find suitable uplink.");
|
|
r = 0;
|
|
} else
|
|
r = link_push_uplink_sip_to_dhcp_server(uplink, link->dhcp_server);
|
|
|
|
}
|
|
if (r < 0)
|
|
log_link_warning_errno(link, r, "Failed to set SIP server for DHCP server, ignoring: %m");
|
|
}
|
|
|
|
r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
|
|
if (r < 0)
|
|
return log_link_error_errno(link, r, "Failed to set router emission for DHCP server: %m");
|
|
|
|
if (link->network->dhcp_server_emit_timezone) {
|
|
_cleanup_free_ char *buffer = NULL;
|
|
const char *tz;
|
|
|
|
if (link->network->dhcp_server_timezone)
|
|
tz = link->network->dhcp_server_timezone;
|
|
else {
|
|
r = get_timezone(&buffer);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to determine timezone: %m");
|
|
|
|
tz = buffer;
|
|
}
|
|
|
|
r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
|
|
if (r < 0)
|
|
return log_link_error_errno(link, r, "Failed to set timezone for DHCP server: %m");
|
|
}
|
|
|
|
ORDERED_HASHMAP_FOREACH(p, link->network->dhcp_server_raw_options, i) {
|
|
r = sd_dhcp_server_add_raw_option(link->dhcp_server, p);
|
|
if (r == -EEXIST)
|
|
continue;
|
|
if (r < 0)
|
|
return log_link_error_errno(link, r, "Failed to set DHCPv4 option: %m");
|
|
}
|
|
|
|
if (!sd_dhcp_server_is_running(link->dhcp_server)) {
|
|
r = sd_dhcp_server_start(link->dhcp_server);
|
|
if (r < 0)
|
|
return log_link_error_errno(link, r, "Could not start DHCPv4 server instance: %m");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int config_parse_dhcp_server_dns(
|
|
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) {
|
|
|
|
Network *n = data;
|
|
const char *p = rvalue;
|
|
int r;
|
|
|
|
assert(filename);
|
|
assert(lvalue);
|
|
assert(rvalue);
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *w = NULL;
|
|
union in_addr_union a;
|
|
struct in_addr *m;
|
|
|
|
r = extract_first_word(&p, &w, NULL, 0);
|
|
if (r == -ENOMEM)
|
|
return log_oom();
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to extract word, ignoring: %s", rvalue);
|
|
return 0;
|
|
}
|
|
if (r == 0)
|
|
break;
|
|
|
|
r = in_addr_from_string(AF_INET, w, &a);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to parse DNS server address '%s', ignoring assignment: %m", w);
|
|
continue;
|
|
}
|
|
|
|
m = reallocarray(n->dhcp_server_dns, n->n_dhcp_server_dns + 1, sizeof(struct in_addr));
|
|
if (!m)
|
|
return log_oom();
|
|
|
|
m[n->n_dhcp_server_dns++] = a.in;
|
|
n->dhcp_server_dns = m;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int config_parse_dhcp_server_ntp(
|
|
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) {
|
|
|
|
Network *n = data;
|
|
const char *p = rvalue;
|
|
int r;
|
|
|
|
assert(filename);
|
|
assert(lvalue);
|
|
assert(rvalue);
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *w = NULL;
|
|
union in_addr_union a;
|
|
struct in_addr *m;
|
|
|
|
r = extract_first_word(&p, &w, NULL, 0);
|
|
if (r == -ENOMEM)
|
|
return log_oom();
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to extract word, ignoring: %s", rvalue);
|
|
return 0;
|
|
}
|
|
if (r == 0)
|
|
return 0;
|
|
|
|
r = in_addr_from_string(AF_INET, w, &a);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to parse NTP server address '%s', ignoring: %m", w);
|
|
continue;
|
|
}
|
|
|
|
m = reallocarray(n->dhcp_server_ntp, n->n_dhcp_server_ntp + 1, sizeof(struct in_addr));
|
|
if (!m)
|
|
return log_oom();
|
|
|
|
m[n->n_dhcp_server_ntp++] = a.in;
|
|
n->dhcp_server_ntp = m;
|
|
}
|
|
}
|
|
|
|
int config_parse_dhcp_server_sip(
|
|
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) {
|
|
|
|
Network *n = data;
|
|
const char *p = rvalue;
|
|
int r;
|
|
|
|
assert(filename);
|
|
assert(lvalue);
|
|
assert(rvalue);
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *w = NULL;
|
|
union in_addr_union a;
|
|
struct in_addr *m;
|
|
|
|
r = extract_first_word(&p, &w, NULL, 0);
|
|
if (r == -ENOMEM)
|
|
return log_oom();
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to extract word, ignoring: %s", rvalue);
|
|
return 0;
|
|
}
|
|
if (r == 0)
|
|
return 0;
|
|
|
|
r = in_addr_from_string(AF_INET, w, &a);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to parse SIP server address '%s', ignoring: %m", w);
|
|
continue;
|
|
}
|
|
|
|
m = reallocarray(n->dhcp_server_sip, n->n_dhcp_server_sip + 1, sizeof(struct in_addr));
|
|
if (!m)
|
|
return log_oom();
|
|
|
|
m[n->n_dhcp_server_sip++] = a.in;
|
|
n->dhcp_server_sip = m;
|
|
}
|
|
}
|
|
|
|
int config_parse_dhcp_server_raw_option_data(
|
|
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) {
|
|
|
|
_cleanup_(sd_dhcp_raw_option_unrefp) sd_dhcp_raw_option *opt = NULL, *old = NULL;
|
|
_cleanup_free_ char *word = NULL, *q = NULL;
|
|
union in_addr_union addr;
|
|
DHCPOptionDataType type;
|
|
Network *network = data;
|
|
uint16_t uint16_data;
|
|
uint32_t uint32_data;
|
|
uint8_t uint8_data;
|
|
const char *p;
|
|
void *udata;
|
|
ssize_t sz;
|
|
uint8_t u;
|
|
int r;
|
|
|
|
assert(filename);
|
|
assert(lvalue);
|
|
assert(rvalue);
|
|
assert(data);
|
|
|
|
if (isempty(rvalue)) {
|
|
network->dhcp_server_raw_options = ordered_hashmap_free(network->dhcp_server_raw_options);
|
|
return 0;
|
|
}
|
|
|
|
p = rvalue;
|
|
r = extract_first_word(&p, &word, ":", 0);
|
|
if (r == -ENOMEM)
|
|
return log_oom();
|
|
if (r <= 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Invalid DHCP server send raw option, ignoring assignment: %s", rvalue);
|
|
return 0;
|
|
}
|
|
|
|
r = safe_atou8(word, &u);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to parse DHCP server send raw option type, ignoring assignment: %s", rvalue);
|
|
return 0;
|
|
}
|
|
if (u < 1 || u >= 255) {
|
|
log_syntax(unit, LOG_ERR, filename, line, 0,
|
|
"Invalid DHCP server send raw option, valid range is 1-254, ignoring assignment: %s", rvalue);
|
|
return 0;
|
|
}
|
|
|
|
free(word);
|
|
|
|
r = extract_first_word(&p, &word, ":", 0);
|
|
if (r == -ENOMEM)
|
|
return log_oom();
|
|
if (r <= 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Invalid DHCP server send raw option, ignoring assignment: %s", rvalue);
|
|
return 0;
|
|
}
|
|
|
|
type = dhcp_option_data_type_from_string(word);
|
|
if (type < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, 0,
|
|
"Invalid DHCP server send data type, ignoring assignment: %s", p);
|
|
return 0;
|
|
}
|
|
|
|
switch(type) {
|
|
case DHCP_OPTION_DATA_UINT8:{
|
|
r = safe_atou8(p, &uint8_data);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to parse DHCPv4 vendor specific uint8 data, ignoring assignment: %s", p);
|
|
return 0;
|
|
}
|
|
|
|
udata = &uint8_data;
|
|
sz = sizeof(uint8_t);
|
|
break;
|
|
}
|
|
case DHCP_OPTION_DATA_UINT16:{
|
|
r = safe_atou16(p, &uint16_data);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to parse DHCPv4 vendor specific uint16 data, ignoring assignment: %s", p);
|
|
return 0;
|
|
}
|
|
|
|
udata = &uint16_data;
|
|
sz = sizeof(uint16_t);
|
|
break;
|
|
}
|
|
case DHCP_OPTION_DATA_UINT32: {
|
|
r = safe_atou32(p, &uint32_data);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to parse DHCPv4 vendor specific uint32 data, ignoring assignment: %s", p);
|
|
return 0;
|
|
}
|
|
|
|
udata = &uint32_data;
|
|
sz = sizeof(uint32_t);
|
|
|
|
break;
|
|
}
|
|
case DHCP_OPTION_DATA_IPV4ADDRESS: {
|
|
r = in_addr_from_string(AF_INET, p, &addr);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to parse DHCPv4 vendor specific ipv4address data, ignoring assignment: %s", p);
|
|
return 0;
|
|
}
|
|
|
|
udata = &addr.in;
|
|
sz = sizeof(addr.in.s_addr);
|
|
break;
|
|
}
|
|
case DHCP_OPTION_DATA_STRING:
|
|
sz = cunescape(p, 0, &q);
|
|
if (sz < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, sz,
|
|
"Failed to decode option data, ignoring assignment: %s", p);
|
|
}
|
|
|
|
udata = q;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
r = sd_dhcp_raw_option_new(u, udata, sz, &opt);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to store DHCP send raw option '%s', ignoring assignment: %m", rvalue);
|
|
return 0;
|
|
}
|
|
|
|
r = ordered_hashmap_ensure_allocated(&network->dhcp_server_raw_options, &dhcp_raw_options_hash_ops);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
/* Overwrite existing option */
|
|
old = ordered_hashmap_remove(network->dhcp_server_raw_options, UINT_TO_PTR(u));
|
|
r = ordered_hashmap_put(network->dhcp_server_raw_options, UINT_TO_PTR(u), opt);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to store DHCP server send raw option '%s'", rvalue);
|
|
return 0;
|
|
}
|
|
|
|
TAKE_PTR(opt);
|
|
|
|
return 0;
|
|
}
|