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"
37 int socket_address_parse(SocketAddress *a, const char *s) {
46 a->type = SOCK_STREAM;
49 /* IPv6 in [x:.....:z]:p notation */
51 if (!(e = strchr(s+1, ']')))
54 if (!(n = strndup(s+1, e-s-1)))
58 if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0) {
60 return errno != 0 ? -errno : -EINVAL;
70 if ((r = safe_atou(e, &u)) < 0)
73 if (u <= 0 || u > 0xFFFF)
76 a->sockaddr.in6.sin6_family = AF_INET6;
77 a->sockaddr.in6.sin6_port = htons((uint16_t) u);
78 a->size = sizeof(struct sockaddr_in6);
80 } else if (*s == '/') {
86 if (l >= sizeof(a->sockaddr.un.sun_path))
89 a->sockaddr.un.sun_family = AF_UNIX;
90 memcpy(a->sockaddr.un.sun_path, s, l);
91 a->size = sizeof(sa_family_t) + l + 1;
93 } else if (*s == '@') {
94 /* Abstract AF_UNIX socket */
98 if (l >= sizeof(a->sockaddr.un.sun_path) - 1)
101 a->sockaddr.un.sun_family = AF_UNIX;
102 memcpy(a->sockaddr.un.sun_path+1, s+1, l);
103 a->size = sizeof(struct sockaddr_un);
107 if ((e = strchr(s, ':'))) {
109 if ((r = safe_atou(e+1, &u)) < 0)
112 if (u <= 0 || u > 0xFFFF)
115 if (!(n = strndup(s, e-s)))
118 /* IPv4 in w.x.y.z:p notation? */
119 if ((r = inet_pton(AF_INET, n, &a->sockaddr.in4.sin_addr)) < 0) {
125 /* Gotcha, it's a traditional IPv4 address */
128 a->sockaddr.in4.sin_family = AF_INET;
129 a->sockaddr.in4.sin_port = htons((uint16_t) u);
130 a->size = sizeof(struct sockaddr_in);
134 if (strlen(n) > IF_NAMESIZE-1) {
139 /* Uh, our last resort, an interface name */
140 idx = if_nametoindex(n);
146 a->sockaddr.in6.sin6_family = AF_INET6;
147 a->sockaddr.in6.sin6_port = htons((uint16_t) u);
148 a->sockaddr.in6.sin6_scope_id = idx;
149 a->sockaddr.in6.sin6_addr = in6addr_any;
150 a->size = sizeof(struct sockaddr_in6);
156 if ((r = safe_atou(s, &u)) < 0)
159 if (u <= 0 || u > 0xFFFF)
162 a->sockaddr.in6.sin6_family = AF_INET6;
163 a->sockaddr.in6.sin6_port = htons((uint16_t) u);
164 a->sockaddr.in6.sin6_addr = in6addr_any;
165 a->size = sizeof(struct sockaddr_in6);
172 int socket_address_verify(const SocketAddress *a) {
175 switch (socket_address_family(a)) {
177 if (a->size != sizeof(struct sockaddr_in))
180 if (a->sockaddr.in4.sin_port == 0)
186 if (a->size != sizeof(struct sockaddr_in6))
189 if (a->sockaddr.in6.sin6_port == 0)
195 if (a->size < sizeof(sa_family_t))
198 if (a->size > sizeof(sa_family_t)) {
200 if (a->sockaddr.un.sun_path[0] == 0) {
202 if (a->size != sizeof(struct sockaddr_un))
208 if (!(e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path))))
211 if (a->size != sizeof(sa_family_t) + (e - a->sockaddr.un.sun_path) + 1)
219 return -EAFNOSUPPORT;
223 int socket_address_print(const SocketAddress *a, char **p) {
228 if ((r = socket_address_verify(a)) < 0)
231 switch (socket_address_family(a)) {
235 if (!(ret = new(char, INET_ADDRSTRLEN+1+5+1)))
238 if (!inet_ntop(AF_INET, &a->sockaddr.in4.sin_addr, ret, INET_ADDRSTRLEN)) {
243 sprintf(strchr(ret, 0), ":%u", ntohs(a->sockaddr.in4.sin_port));
251 if (!(ret = new(char, 1+INET6_ADDRSTRLEN+2+5+1)))
255 if (!inet_ntop(AF_INET6, &a->sockaddr.in6.sin6_addr, ret+1, INET6_ADDRSTRLEN)) {
260 sprintf(strchr(ret, 0), "]:%u", ntohs(a->sockaddr.in6.sin6_port));
268 if (a->size <= sizeof(sa_family_t)) {
270 if (!(ret = strdup("<unamed>")))
273 } else if (a->sockaddr.un.sun_path[0] == 0) {
276 /* FIXME: We assume we can print the
277 * socket path here and that it hasn't
278 * more than one NUL byte. That is
279 * actually an invalid assumption */
281 if (!(ret = new(char, sizeof(a->sockaddr.un.sun_path)+1)))
285 memcpy(ret+1, a->sockaddr.un.sun_path+1, sizeof(a->sockaddr.un.sun_path)-1);
286 ret[sizeof(a->sockaddr.un.sun_path)] = 0;
290 if (!(ret = strdup(a->sockaddr.un.sun_path)))
303 int socket_address_listen(
304 const SocketAddress *a,
306 SocketAddressBindIPv6Only only,
307 const char *bind_to_device,
308 mode_t directory_mode,
316 if ((r = socket_address_verify(a)) < 0)
319 if ((fd = socket(socket_address_family(a), a->type | SOCK_NONBLOCK | SOCK_CLOEXEC, 0)) < 0)
322 if (socket_address_family(a) == AF_INET6 && only != SOCKET_ADDRESS_DEFAULT) {
323 int flag = only == SOCKET_ADDRESS_IPV6_ONLY;
325 if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &flag, sizeof(flag)) < 0)
330 if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, bind_to_device, strlen(bind_to_device)+1) < 0)
334 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0)
337 if (socket_address_family(a) == AF_UNIX && a->sockaddr.un.sun_path[0] != 0) {
341 mkdir_parents(a->sockaddr.un.sun_path, directory_mode);
343 /* Enforce the right access mode for the socket*/
344 old_mask = umask(~ socket_mode);
346 /* Include the original umask in our mask */
347 umask(~socket_mode | old_mask);
349 r = bind(fd, &a->sockaddr.sa, a->size);
351 if (r < 0 && errno == EADDRINUSE) {
352 /* Unlink and try again */
353 unlink(a->sockaddr.un.sun_path);
354 r = bind(fd, &a->sockaddr.sa, a->size);
359 r = bind(fd, &a->sockaddr.sa, a->size);
364 if (a->type == SOCK_STREAM)
365 if (listen(fd, backlog) < 0)
373 close_nointr_nofail(fd);
377 bool socket_address_can_accept(const SocketAddress *a) {
381 a->type == SOCK_STREAM ||
382 a->type == SOCK_SEQPACKET;
385 bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) {
389 /* Invalid addresses are unequal to all */
390 if (socket_address_verify(a) < 0 ||
391 socket_address_verify(b) < 0)
394 if (a->type != b->type)
397 if (a->size != b->size)
400 if (socket_address_family(a) != socket_address_family(b))
403 switch (socket_address_family(a)) {
406 if (a->sockaddr.in4.sin_addr.s_addr != b->sockaddr.in4.sin_addr.s_addr)
409 if (a->sockaddr.in4.sin_port != b->sockaddr.in4.sin_port)
415 if (memcmp(&a->sockaddr.in6.sin6_addr, &b->sockaddr.in6.sin6_addr, sizeof(a->sockaddr.in6.sin6_addr)) != 0)
418 if (a->sockaddr.in6.sin6_port != b->sockaddr.in6.sin6_port)
425 if ((a->sockaddr.un.sun_path[0] == 0) != (b->sockaddr.un.sun_path[0] == 0))
428 if (a->sockaddr.un.sun_path[0]) {
429 if (strncmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, sizeof(a->sockaddr.un.sun_path)) != 0)
432 if (memcmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, sizeof(a->sockaddr.un.sun_path)) != 0)
439 /* Cannot compare, so we assume the addresses are different */
446 bool socket_address_is(const SocketAddress *a, const char *s, int type) {
447 struct SocketAddress b;
452 if (socket_address_parse(&b, s) < 0)
457 return socket_address_equal(a, &b);
460 bool socket_address_needs_mount(const SocketAddress *a, const char *prefix) {
463 if (socket_address_family(a) != AF_UNIX)
466 if (a->sockaddr.un.sun_path[0] == 0)
469 return path_startswith(a->sockaddr.un.sun_path, prefix);
472 static const char* const socket_address_bind_ipv6_only_table[_SOCKET_ADDRESS_BIND_IPV6_ONLY_MAX] = {
473 [SOCKET_ADDRESS_DEFAULT] = "default",
474 [SOCKET_ADDRESS_BOTH] = "both",
475 [SOCKET_ADDRESS_IPV6_ONLY] = "ipv6-only"
478 DEFINE_STRING_TABLE_LOOKUP(socket_address_bind_ipv6_only, SocketAddressBindIPv6Only);