1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
27 #include <arpa/inet.h>
30 #include <sys/types.h>
35 #include "socket-util.h"
38 int socket_address_parse(SocketAddress *a, const char *s) {
47 a->type = SOCK_STREAM;
50 /* IPv6 in [x:.....:z]:p notation */
52 if (!(e = strchr(s+1, ']')))
55 if (!(n = strndup(s+1, e-s-1)))
59 if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0) {
61 return errno != 0 ? -errno : -EINVAL;
71 if ((r = safe_atou(e, &u)) < 0)
74 if (u <= 0 || u > 0xFFFF)
77 a->sockaddr.in6.sin6_family = AF_INET6;
78 a->sockaddr.in6.sin6_port = htons((uint16_t) u);
79 a->size = sizeof(struct sockaddr_in6);
81 } else if (*s == '/') {
87 if (l >= sizeof(a->sockaddr.un.sun_path))
90 a->sockaddr.un.sun_family = AF_UNIX;
91 memcpy(a->sockaddr.un.sun_path, s, l);
92 a->size = sizeof(sa_family_t) + l + 1;
94 } else if (*s == '@') {
95 /* Abstract AF_UNIX socket */
99 if (l >= sizeof(a->sockaddr.un.sun_path) - 1)
102 a->sockaddr.un.sun_family = AF_UNIX;
103 memcpy(a->sockaddr.un.sun_path+1, s+1, l);
104 a->size = sizeof(struct sockaddr_un);
108 if ((e = strchr(s, ':'))) {
110 if ((r = safe_atou(e+1, &u)) < 0)
113 if (u <= 0 || u > 0xFFFF)
116 if (!(n = strndup(s, e-s)))
119 /* IPv4 in w.x.y.z:p notation? */
120 if ((r = inet_pton(AF_INET, n, &a->sockaddr.in4.sin_addr)) < 0) {
126 /* Gotcha, it's a traditional IPv4 address */
129 a->sockaddr.in4.sin_family = AF_INET;
130 a->sockaddr.in4.sin_port = htons((uint16_t) u);
131 a->size = sizeof(struct sockaddr_in);
135 if (strlen(n) > IF_NAMESIZE-1) {
140 /* Uh, our last resort, an interface name */
141 idx = if_nametoindex(n);
147 a->sockaddr.in6.sin6_family = AF_INET6;
148 a->sockaddr.in6.sin6_port = htons((uint16_t) u);
149 a->sockaddr.in6.sin6_scope_id = idx;
150 a->sockaddr.in6.sin6_addr = in6addr_any;
151 a->size = sizeof(struct sockaddr_in6);
157 if ((r = safe_atou(s, &u)) < 0)
160 if (u <= 0 || u > 0xFFFF)
163 a->sockaddr.in6.sin6_family = AF_INET6;
164 a->sockaddr.in6.sin6_port = htons((uint16_t) u);
165 a->sockaddr.in6.sin6_addr = in6addr_any;
166 a->size = sizeof(struct sockaddr_in6);
173 int socket_address_verify(const SocketAddress *a) {
176 switch (socket_address_family(a)) {
178 if (a->size != sizeof(struct sockaddr_in))
181 if (a->sockaddr.in4.sin_port == 0)
187 if (a->size != sizeof(struct sockaddr_in6))
190 if (a->sockaddr.in6.sin6_port == 0)
196 if (a->size < sizeof(sa_family_t))
199 if (a->size > sizeof(sa_family_t)) {
201 if (a->sockaddr.un.sun_path[0] == 0) {
203 if (a->size != sizeof(struct sockaddr_un))
209 if (!(e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path))))
212 if (a->size != sizeof(sa_family_t) + (e - a->sockaddr.un.sun_path) + 1)
220 return -EAFNOSUPPORT;
224 int socket_address_print(const SocketAddress *a, char **p) {
229 if ((r = socket_address_verify(a)) < 0)
232 switch (socket_address_family(a)) {
236 if (!(ret = new(char, INET_ADDRSTRLEN+1+5+1)))
239 if (!inet_ntop(AF_INET, &a->sockaddr.in4.sin_addr, ret, INET_ADDRSTRLEN)) {
244 sprintf(strchr(ret, 0), ":%u", ntohs(a->sockaddr.in4.sin_port));
252 if (!(ret = new(char, 1+INET6_ADDRSTRLEN+2+5+1)))
256 if (!inet_ntop(AF_INET6, &a->sockaddr.in6.sin6_addr, ret+1, INET6_ADDRSTRLEN)) {
261 sprintf(strchr(ret, 0), "]:%u", ntohs(a->sockaddr.in6.sin6_port));
269 if (a->size <= sizeof(sa_family_t)) {
271 if (!(ret = strdup("<unamed>")))
274 } else if (a->sockaddr.un.sun_path[0] == 0) {
277 /* FIXME: We assume we can print the
278 * socket path here and that it hasn't
279 * more than one NUL byte. That is
280 * actually an invalid assumption */
282 if (!(ret = new(char, sizeof(a->sockaddr.un.sun_path)+1)))
286 memcpy(ret+1, a->sockaddr.un.sun_path+1, sizeof(a->sockaddr.un.sun_path)-1);
287 ret[sizeof(a->sockaddr.un.sun_path)] = 0;
291 if (!(ret = strdup(a->sockaddr.un.sun_path)))
304 int socket_address_listen(
305 const SocketAddress *a,
307 SocketAddressBindIPv6Only only,
308 const char *bind_to_device,
310 mode_t directory_mode,
318 if ((r = socket_address_verify(a)) < 0)
321 if ((fd = socket(socket_address_family(a), a->type | SOCK_NONBLOCK | SOCK_CLOEXEC, 0)) < 0)
324 if (socket_address_family(a) == AF_INET6 && only != SOCKET_ADDRESS_DEFAULT) {
325 int flag = only == SOCKET_ADDRESS_IPV6_ONLY;
327 if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &flag, sizeof(flag)) < 0)
332 if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, bind_to_device, strlen(bind_to_device)+1) < 0)
337 if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &one, sizeof(one)) < 0)
338 log_warning("IP_FREEBIND failed: %m");
342 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0)
345 if (socket_address_family(a) == AF_UNIX && a->sockaddr.un.sun_path[0] != 0) {
349 mkdir_parents(a->sockaddr.un.sun_path, directory_mode);
351 /* Enforce the right access mode for the socket*/
352 old_mask = umask(~ socket_mode);
354 /* Include the original umask in our mask */
355 umask(~socket_mode | old_mask);
357 r = bind(fd, &a->sockaddr.sa, a->size);
359 if (r < 0 && errno == EADDRINUSE) {
360 /* Unlink and try again */
361 unlink(a->sockaddr.un.sun_path);
362 r = bind(fd, &a->sockaddr.sa, a->size);
367 r = bind(fd, &a->sockaddr.sa, a->size);
372 if (a->type == SOCK_STREAM)
373 if (listen(fd, backlog) < 0)
381 close_nointr_nofail(fd);
385 bool socket_address_can_accept(const SocketAddress *a) {
389 a->type == SOCK_STREAM ||
390 a->type == SOCK_SEQPACKET;
393 bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) {
397 /* Invalid addresses are unequal to all */
398 if (socket_address_verify(a) < 0 ||
399 socket_address_verify(b) < 0)
402 if (a->type != b->type)
405 if (a->size != b->size)
408 if (socket_address_family(a) != socket_address_family(b))
411 switch (socket_address_family(a)) {
414 if (a->sockaddr.in4.sin_addr.s_addr != b->sockaddr.in4.sin_addr.s_addr)
417 if (a->sockaddr.in4.sin_port != b->sockaddr.in4.sin_port)
423 if (memcmp(&a->sockaddr.in6.sin6_addr, &b->sockaddr.in6.sin6_addr, sizeof(a->sockaddr.in6.sin6_addr)) != 0)
426 if (a->sockaddr.in6.sin6_port != b->sockaddr.in6.sin6_port)
433 if ((a->sockaddr.un.sun_path[0] == 0) != (b->sockaddr.un.sun_path[0] == 0))
436 if (a->sockaddr.un.sun_path[0]) {
437 if (strncmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, sizeof(a->sockaddr.un.sun_path)) != 0)
440 if (memcmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, sizeof(a->sockaddr.un.sun_path)) != 0)
447 /* Cannot compare, so we assume the addresses are different */
454 bool socket_address_is(const SocketAddress *a, const char *s, int type) {
455 struct SocketAddress b;
460 if (socket_address_parse(&b, s) < 0)
465 return socket_address_equal(a, &b);
468 bool socket_address_needs_mount(const SocketAddress *a, const char *prefix) {
471 if (socket_address_family(a) != AF_UNIX)
474 if (a->sockaddr.un.sun_path[0] == 0)
477 return path_startswith(a->sockaddr.un.sun_path, prefix);
480 static const char* const socket_address_bind_ipv6_only_table[_SOCKET_ADDRESS_BIND_IPV6_ONLY_MAX] = {
481 [SOCKET_ADDRESS_DEFAULT] = "default",
482 [SOCKET_ADDRESS_BOTH] = "both",
483 [SOCKET_ADDRESS_IPV6_ONLY] = "ipv6-only"
486 DEFINE_STRING_TABLE_LOOKUP(socket_address_bind_ipv6_only, SocketAddressBindIPv6Only);