-/***
- This file is part of systemd.
-
- Copyright 2016 Lennart Poettering
-
- 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/>.
-***/
+/* SPDX-License-Identifier: LGPL-2.1+ */
#include "fd-util.h"
#include "fileio.h"
/* Recheck /etc/hosts at most once every 2s */
#define ETC_HOSTS_RECHECK_USEC (2*USEC_PER_SEC)
-typedef struct EtcHostsItem {
- int family;
- union in_addr_union address;
-
- char **names;
-} EtcHostsItem;
-
-typedef struct EtcHostsItemByName {
- char *name;
-
- EtcHostsItem **items;
- size_t n_items, n_allocated;
-} EtcHostsItemByName;
-
-void manager_etc_hosts_flush(Manager *m) {
- EtcHostsItem *item;
- EtcHostsItemByName *bn;
-
- while ((item = set_steal_first(m->etc_hosts_by_address))) {
- strv_free(item->names);
- free(item);
- }
-
- while ((bn = hashmap_steal_first(m->etc_hosts_by_name))) {
- free(bn->name);
- free(bn->items);
- free(bn);
- }
-
- m->etc_hosts_by_address = set_free(m->etc_hosts_by_address);
- m->etc_hosts_by_name = hashmap_free(m->etc_hosts_by_name);
-
- m->etc_hosts_mtime = USEC_INFINITY;
+static inline void etc_hosts_item_free(EtcHostsItem *item) {
+ strv_free(item->names);
+ free(item);
}
-static void etc_hosts_item_hash_func(const void *p, struct siphash *state) {
- const EtcHostsItem *item = p;
-
- siphash24_compress(&item->family, sizeof(item->family), state);
-
- if (item->family == AF_INET)
- siphash24_compress(&item->address.in, sizeof(item->address.in), state);
- else if (item->family == AF_INET6)
- siphash24_compress(&item->address.in6, sizeof(item->address.in6), state);
+static inline void etc_hosts_item_by_name_free(EtcHostsItemByName *item) {
+ free(item->name);
+ free(item->addresses);
+ free(item);
}
-static int etc_hosts_item_compare_func(const void *a, const void *b) {
- const EtcHostsItem *x = a, *y = b;
-
- if (x->family != y->family)
- return x->family - y->family;
-
- if (x->family == AF_INET)
- return memcmp(&x->address.in.s_addr, &y->address.in.s_addr, sizeof(struct in_addr));
-
- if (x->family == AF_INET6)
- return memcmp(&x->address.in6.s6_addr, &y->address.in6.s6_addr, sizeof(struct in6_addr));
-
- return trivial_compare_func(a, b);
+void etc_hosts_free(EtcHosts *hosts) {
+ hosts->by_address = hashmap_free_with_destructor(hosts->by_address, etc_hosts_item_free);
+ hosts->by_name = hashmap_free_with_destructor(hosts->by_name, etc_hosts_item_by_name_free);
}
-static const struct hash_ops etc_hosts_item_ops = {
- .hash = etc_hosts_item_hash_func,
- .compare = etc_hosts_item_compare_func,
-};
-
-static int add_item(Manager *m, int family, const union in_addr_union *address, char **names) {
+void manager_etc_hosts_flush(Manager *m) {
+ etc_hosts_free(&m->etc_hosts);
+ m->etc_hosts_mtime = USEC_INFINITY;
+}
- EtcHostsItem key = {
- .family = family,
- .address = *address,
- };
+static int parse_line(EtcHosts *hosts, unsigned nr, const char *line) {
+ _cleanup_free_ char *address_str = NULL;
+ struct in_addr_data address = {};
+ bool suppressed = false;
EtcHostsItem *item;
- char **n;
int r;
- assert(m);
- assert(address);
+ assert(hosts);
+ assert(line);
+
+ r = extract_first_word(&line, &address_str, NULL, EXTRACT_RELAX);
+ if (r < 0)
+ return log_error_errno(r, "Couldn't extract address, in line /etc/hosts:%u.", nr);
+ if (r == 0) {
+ log_error("Premature end of line, in line /etc/hosts:%u.", nr);
+ return -EINVAL;
+ }
+
+ r = in_addr_ifindex_from_string_auto(address_str, &address.family, &address.address, NULL);
+ if (r < 0)
+ return log_error_errno(r, "Address '%s' is invalid, in line /etc/hosts:%u.", address_str, nr);
- r = in_addr_is_null(family, address);
+ r = in_addr_is_null(address.family, &address.address);
if (r < 0)
return r;
if (r > 0)
* nothing. */
item = NULL;
else {
- /* If this is a normal address, then, simply add entry mapping it to the specified names */
-
- item = set_get(m->etc_hosts_by_address, &key);
- if (item) {
- r = strv_extend_strv(&item->names, names, true);
- if (r < 0)
- return log_oom();
- } else {
+ /* If this is a normal address, then simply add entry mapping it to the specified names */
- r = set_ensure_allocated(&m->etc_hosts_by_address, &etc_hosts_item_ops);
+ item = hashmap_get(hosts->by_address, &address);
+ if (!item) {
+ r = hashmap_ensure_allocated(&hosts->by_address, &in_addr_data_hash_ops);
if (r < 0)
return log_oom();
if (!item)
return log_oom();
- item->family = family;
- item->address = *address;
- item->names = names;
+ item->address = address;
- r = set_put(m->etc_hosts_by_address, item);
+ r = hashmap_put(hosts->by_address, &item->address, item);
if (r < 0) {
free(item);
return log_oom();
}
}
- STRV_FOREACH(n, names) {
+ for (;;) {
+ _cleanup_free_ char *name = NULL;
EtcHostsItemByName *bn;
- bn = hashmap_get(m->etc_hosts_by_name, *n);
+ r = extract_first_word(&line, &name, NULL, EXTRACT_RELAX);
+ if (r < 0)
+ return log_error_errno(r, "Couldn't extract host name, in line /etc/hosts:%u.", nr);
+ if (r == 0)
+ break;
+
+ r = dns_name_is_valid(name);
+ if (r <= 0)
+ return log_error_errno(r, "Hostname %s is not valid, ignoring, in line /etc/hosts:%u.", name, nr);
+
+ if (is_localhost(name)) {
+ /* Suppress the "localhost" line that is often seen */
+ suppressed = true;
+ continue;
+ }
+
+ if (item) {
+ r = strv_extend(&item->names, name);
+ if (r < 0)
+ return log_oom();
+ }
+
+ bn = hashmap_get(hosts->by_name, name);
if (!bn) {
- r = hashmap_ensure_allocated(&m->etc_hosts_by_name, &dns_name_hash_ops);
+ r = hashmap_ensure_allocated(&hosts->by_name, &dns_name_hash_ops);
if (r < 0)
return log_oom();
if (!bn)
return log_oom();
- bn->name = strdup(*n);
- if (!bn->name) {
- free(bn);
- return log_oom();
- }
-
- r = hashmap_put(m->etc_hosts_by_name, bn->name, bn);
+ r = hashmap_put(hosts->by_name, name, bn);
if (r < 0) {
- free(bn->name);
free(bn);
return log_oom();
}
+
+ bn->name = TAKE_PTR(name);
}
if (item) {
- if (!GREEDY_REALLOC(bn->items, bn->n_allocated, bn->n_items+1))
+ if (!GREEDY_REALLOC(bn->addresses, bn->n_allocated, bn->n_addresses + 1))
return log_oom();
- bn->items[bn->n_items++] = item;
+ bn->addresses[bn->n_addresses++] = &item->address;
}
- }
-
- return 0;
-}
-static int parse_line(Manager *m, unsigned nr, const char *line) {
- _cleanup_free_ char *address = NULL;
- _cleanup_strv_free_ char **names = NULL;
- union in_addr_union in;
- bool suppressed = false;
- int family, r;
-
- assert(m);
- assert(line);
+ suppressed = true;
+ }
- r = extract_first_word(&line, &address, NULL, EXTRACT_RELAX);
- if (r < 0)
- return log_error_errno(r, "Couldn't extract address, in line /etc/hosts:%u.", nr);
- if (r == 0) {
- log_error("Premature end of line, in line /etc/hosts:%u.", nr);
+ if (!suppressed) {
+ log_error("Line is missing any host names, in line /etc/hosts:%u.", nr);
return -EINVAL;
}
- r = in_addr_from_string_auto(address, &family, &in);
- if (r < 0)
- return log_error_errno(r, "Address '%s' is invalid, in line /etc/hosts:%u.", address, nr);
+ return 0;
+}
- for (;;) {
- _cleanup_free_ char *name = NULL;
+int etc_hosts_parse(EtcHosts *hosts, FILE *f) {
+ _cleanup_(etc_hosts_free) EtcHosts t = {};
+ char line[LINE_MAX];
+ unsigned nr = 0;
+ int r;
- r = extract_first_word(&line, &name, NULL, EXTRACT_RELAX);
- if (r < 0)
- return log_error_errno(r, "Couldn't extract host name, in line /etc/hosts:%u.", nr);
- if (r == 0)
- break;
+ FOREACH_LINE(line, f, return log_error_errno(errno, "Failed to read /etc/hosts: %m")) {
+ char *l;
- r = dns_name_is_valid(name);
- if (r <= 0)
- return log_error_errno(r, "Hostname %s is not valid, ignoring, in line /etc/hosts:%u.", name, nr);
+ nr++;
- if (is_localhost(name)) {
- /* Suppress the "localhost" line that is often seen */
- suppressed = true;
+ l = strstrip(line);
+ if (isempty(l))
+ continue;
+ if (l[0] == '#')
continue;
- }
- r = strv_push(&names, name);
+ r = parse_line(&t, nr, l);
if (r < 0)
- return log_oom();
-
- name = NULL;
- }
-
- if (strv_isempty(names)) {
-
- if (suppressed)
- return 0;
-
- log_error("Line is missing any host names, in line /etc/hosts:%u.", nr);
- return -EINVAL;
+ return r;
}
- /* Takes possession of the names strv */
- r = add_item(m, family, &in, names);
- if (r < 0)
- return r;
-
- names = NULL;
- return r;
+ *hosts = t;
+ t = (EtcHosts) {}; /* prevent cleanup */
+ return 0;
}
-int manager_etc_hosts_read(Manager *m) {
+static int manager_etc_hosts_read(Manager *m) {
_cleanup_fclose_ FILE *f = NULL;
- char line[LINE_MAX];
struct stat st;
usec_t ts;
- unsigned nr = 0;
int r;
assert_se(sd_event_now(m->event, clock_boottime_or_monotonic(), &ts) >= 0);
if (m->etc_hosts_mtime != USEC_INFINITY) {
if (stat("/etc/hosts", &st) < 0) {
- if (errno == ENOENT) {
- r = 0;
- goto clear;
- }
+ if (errno != ENOENT)
+ return log_error_errno(errno, "Failed to stat /etc/hosts: %m");
- return log_error_errno(errno, "Failed to stat /etc/hosts: %m");
+ manager_etc_hosts_flush(m);
+ return 0;
}
/* Did the mtime change? If not, there's no point in re-reading the file. */
f = fopen("/etc/hosts", "re");
if (!f) {
- if (errno == ENOENT) {
- r = 0;
- goto clear;
- }
+ if (errno != ENOENT)
+ return log_error_errno(errno, "Failed to open /etc/hosts: %m");
- return log_error_errno(errno, "Failed to open /etc/hosts: %m");
+ manager_etc_hosts_flush(m);
+ return 0;
}
/* Take the timestamp at the beginning of processing, so that any changes made later are read on the next
manager_etc_hosts_flush(m);
- FOREACH_LINE(line, f, return log_error_errno(errno, "Failed to read /etc/hosts: %m")) {
- char *l;
-
- nr ++;
-
- l = strstrip(line);
- if (isempty(l))
- continue;
- if (l[0] == '#')
- continue;
-
- r = parse_line(m, nr, l);
- if (r == -ENOMEM) /* On OOM we abandon the half-built-up structure. All other errors we ignore and proceed */
- goto clear;
- }
+ r = etc_hosts_parse(&m->etc_hosts, f);
+ if (r == -ENOMEM)
+ /* On OOM we bail. All other errors we ignore and proceed. */
+ return r;
m->etc_hosts_mtime = timespec_load(&st.st_mtim);
m->etc_hosts_last = ts;
return 1;
-
-clear:
- manager_etc_hosts_flush(m);
- return r;
}
int manager_etc_hosts_lookup(Manager *m, DnsQuestion* q, DnsAnswer **answer) {
bool found_a = false, found_aaaa = false;
+ struct in_addr_data k = {};
EtcHostsItemByName *bn;
- EtcHostsItem k = {};
DnsResourceKey *t;
const char *name;
unsigned i;
assert(q);
assert(answer);
+ if (!m->read_etc_hosts)
+ return 0;
+
r = manager_etc_hosts_read(m);
if (r < 0)
return r;
EtcHostsItem *item;
DnsResourceKey *found_ptr = NULL;
- item = set_get(m->etc_hosts_by_address, &k);
+ item = hashmap_get(m->etc_hosts.by_address, &k);
if (!item)
return 0;
if (!IN_SET(t->class, DNS_CLASS_IN, DNS_CLASS_ANY))
continue;
- r = dns_name_equal(DNS_RESOURCE_KEY_NAME(t), name);
+ r = dns_name_equal(dns_resource_key_name(t), name);
if (r < 0)
return r;
if (r > 0) {
return 1;
}
- bn = hashmap_get(m->etc_hosts_by_name, name);
+ bn = hashmap_get(m->etc_hosts.by_name, name);
if (!bn)
return 0;
- r = dns_answer_reserve(answer, bn->n_items);
+ r = dns_answer_reserve(answer, bn->n_addresses);
if (r < 0)
return r;
if (!IN_SET(t->class, DNS_CLASS_IN, DNS_CLASS_ANY))
continue;
- r = dns_name_equal(DNS_RESOURCE_KEY_NAME(t), name);
+ r = dns_name_equal(dns_resource_key_name(t), name);
if (r < 0)
return r;
if (r == 0)
break;
}
- for (i = 0; i < bn->n_items; i++) {
+ for (i = 0; i < bn->n_addresses; i++) {
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
- if ((found_a && bn->items[i]->family != AF_INET) &&
- (found_aaaa && bn->items[i]->family != AF_INET6))
+ if ((!found_a && bn->addresses[i]->family == AF_INET) ||
+ (!found_aaaa && bn->addresses[i]->family == AF_INET6))
continue;
- r = dns_resource_record_new_address(&rr, bn->items[i]->family, &bn->items[i]->address, bn->name);
+ r = dns_resource_record_new_address(&rr, bn->addresses[i]->family, &bn->addresses[i]->address, bn->name);
if (r < 0)
return r;
return r;
}
- return 1;
+ return found_a || found_aaaa;
}
projects / thirdparty / systemd.git / blobdiff