1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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 #include <sys/ioctl.h>
40 int socket_address_parse(SocketAddress *a, const char *s) {
49 a->type = SOCK_STREAM;
52 /* IPv6 in [x:.....:z]:p notation */
54 if (!socket_ipv6_is_supported()) {
55 log_warning("Binding to IPv6 address not available since kernel does not support IPv6.");
59 if (!(e = strchr(s+1, ']')))
62 if (!(n = strndup(s+1, e-s-1)))
66 if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0) {
68 return errno != 0 ? -errno : -EINVAL;
78 if ((r = safe_atou(e, &u)) < 0)
81 if (u <= 0 || u > 0xFFFF)
84 a->sockaddr.in6.sin6_family = AF_INET6;
85 a->sockaddr.in6.sin6_port = htons((uint16_t) u);
86 a->size = sizeof(struct sockaddr_in6);
88 } else if (*s == '/') {
94 if (l >= sizeof(a->sockaddr.un.sun_path))
97 a->sockaddr.un.sun_family = AF_UNIX;
98 memcpy(a->sockaddr.un.sun_path, s, l);
99 a->size = sizeof(sa_family_t) + l + 1;
101 } else if (*s == '@') {
102 /* Abstract AF_UNIX socket */
106 if (l >= sizeof(a->sockaddr.un.sun_path) - 1)
109 a->sockaddr.un.sun_family = AF_UNIX;
110 memcpy(a->sockaddr.un.sun_path+1, s+1, l);
111 a->size = sizeof(sa_family_t) + 1 + l;
115 if ((e = strchr(s, ':'))) {
117 if ((r = safe_atou(e+1, &u)) < 0)
120 if (u <= 0 || u > 0xFFFF)
123 if (!(n = strndup(s, e-s)))
126 /* IPv4 in w.x.y.z:p notation? */
127 if ((r = inet_pton(AF_INET, n, &a->sockaddr.in4.sin_addr)) < 0) {
133 /* Gotcha, it's a traditional IPv4 address */
136 a->sockaddr.in4.sin_family = AF_INET;
137 a->sockaddr.in4.sin_port = htons((uint16_t) u);
138 a->size = sizeof(struct sockaddr_in);
142 if (strlen(n) > IF_NAMESIZE-1) {
147 /* Uh, our last resort, an interface name */
148 idx = if_nametoindex(n);
154 if (!socket_ipv6_is_supported()) {
155 log_warning("Binding to interface is not available since kernel does not support IPv6.");
156 return -EAFNOSUPPORT;
159 a->sockaddr.in6.sin6_family = AF_INET6;
160 a->sockaddr.in6.sin6_port = htons((uint16_t) u);
161 a->sockaddr.in6.sin6_scope_id = idx;
162 a->sockaddr.in6.sin6_addr = in6addr_any;
163 a->size = sizeof(struct sockaddr_in6);
168 if ((r = safe_atou(s, &u)) < 0)
171 if (u <= 0 || u > 0xFFFF)
174 if (socket_ipv6_is_supported()) {
175 a->sockaddr.in6.sin6_family = AF_INET6;
176 a->sockaddr.in6.sin6_port = htons((uint16_t) u);
177 a->sockaddr.in6.sin6_addr = in6addr_any;
178 a->size = sizeof(struct sockaddr_in6);
180 a->sockaddr.in4.sin_family = AF_INET;
181 a->sockaddr.in4.sin_port = htons((uint16_t) u);
182 a->sockaddr.in4.sin_addr.s_addr = INADDR_ANY;
183 a->size = sizeof(struct sockaddr_in);
191 int socket_address_verify(const SocketAddress *a) {
194 switch (socket_address_family(a)) {
196 if (a->size != sizeof(struct sockaddr_in))
199 if (a->sockaddr.in4.sin_port == 0)
205 if (a->size != sizeof(struct sockaddr_in6))
208 if (a->sockaddr.in6.sin6_port == 0)
214 if (a->size < sizeof(sa_family_t))
217 if (a->size > sizeof(sa_family_t)) {
219 if (a->sockaddr.un.sun_path[0] != 0) {
223 if (!(e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path))))
226 if (a->size != sizeof(sa_family_t) + (e - a->sockaddr.un.sun_path) + 1)
234 return -EAFNOSUPPORT;
238 int socket_address_print(const SocketAddress *a, char **p) {
243 if ((r = socket_address_verify(a)) < 0)
246 switch (socket_address_family(a)) {
250 if (!(ret = new(char, INET_ADDRSTRLEN+1+5+1)))
253 if (!inet_ntop(AF_INET, &a->sockaddr.in4.sin_addr, ret, INET_ADDRSTRLEN)) {
258 sprintf(strchr(ret, 0), ":%u", ntohs(a->sockaddr.in4.sin_port));
266 if (!(ret = new(char, 1+INET6_ADDRSTRLEN+2+5+1)))
270 if (!inet_ntop(AF_INET6, &a->sockaddr.in6.sin6_addr, ret+1, INET6_ADDRSTRLEN)) {
275 sprintf(strchr(ret, 0), "]:%u", ntohs(a->sockaddr.in6.sin6_port));
283 if (a->size <= sizeof(sa_family_t)) {
285 if (!(ret = strdup("<unamed>")))
288 } else if (a->sockaddr.un.sun_path[0] == 0) {
291 /* FIXME: We assume we can print the
292 * socket path here and that it hasn't
293 * more than one NUL byte. That is
294 * actually an invalid assumption */
296 if (!(ret = new(char, sizeof(a->sockaddr.un.sun_path)+1)))
300 memcpy(ret+1, a->sockaddr.un.sun_path+1, sizeof(a->sockaddr.un.sun_path)-1);
301 ret[sizeof(a->sockaddr.un.sun_path)] = 0;
305 if (!(ret = strdup(a->sockaddr.un.sun_path)))
318 int socket_address_listen(
319 const SocketAddress *a,
321 SocketAddressBindIPv6Only only,
322 const char *bind_to_device,
324 mode_t directory_mode,
333 if ((r = socket_address_verify(a)) < 0)
336 if (socket_address_family(a) == AF_INET6 && !socket_ipv6_is_supported())
337 return -EAFNOSUPPORT;
339 r = label_socket_set(label);
343 fd = socket(socket_address_family(a), a->type | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
344 r = fd < 0 ? -errno : 0;
346 label_socket_clear();
351 if (socket_address_family(a) == AF_INET6 && only != SOCKET_ADDRESS_DEFAULT) {
352 int flag = only == SOCKET_ADDRESS_IPV6_ONLY;
354 if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &flag, sizeof(flag)) < 0)
359 if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, bind_to_device, strlen(bind_to_device)+1) < 0)
364 if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &one, sizeof(one)) < 0)
365 log_warning("IP_FREEBIND failed: %m");
369 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0)
372 if (socket_address_family(a) == AF_UNIX && a->sockaddr.un.sun_path[0] != 0) {
376 mkdir_parents(a->sockaddr.un.sun_path, directory_mode);
378 /* Enforce the right access mode for the socket*/
379 old_mask = umask(~ socket_mode);
381 /* Include the original umask in our mask */
382 umask(~socket_mode | old_mask);
384 r = bind(fd, &a->sockaddr.sa, a->size);
386 if (r < 0 && errno == EADDRINUSE) {
387 /* Unlink and try again */
388 unlink(a->sockaddr.un.sun_path);
389 r = bind(fd, &a->sockaddr.sa, a->size);
394 r = bind(fd, &a->sockaddr.sa, a->size);
399 if (a->type == SOCK_STREAM)
400 if (listen(fd, backlog) < 0)
408 close_nointr_nofail(fd);
412 bool socket_address_can_accept(const SocketAddress *a) {
416 a->type == SOCK_STREAM ||
417 a->type == SOCK_SEQPACKET;
420 bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) {
424 /* Invalid addresses are unequal to all */
425 if (socket_address_verify(a) < 0 ||
426 socket_address_verify(b) < 0)
429 if (a->type != b->type)
432 if (a->size != b->size)
435 if (socket_address_family(a) != socket_address_family(b))
438 switch (socket_address_family(a)) {
441 if (a->sockaddr.in4.sin_addr.s_addr != b->sockaddr.in4.sin_addr.s_addr)
444 if (a->sockaddr.in4.sin_port != b->sockaddr.in4.sin_port)
450 if (memcmp(&a->sockaddr.in6.sin6_addr, &b->sockaddr.in6.sin6_addr, sizeof(a->sockaddr.in6.sin6_addr)) != 0)
453 if (a->sockaddr.in6.sin6_port != b->sockaddr.in6.sin6_port)
460 if ((a->sockaddr.un.sun_path[0] == 0) != (b->sockaddr.un.sun_path[0] == 0))
463 if (a->sockaddr.un.sun_path[0]) {
464 if (strncmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, sizeof(a->sockaddr.un.sun_path)) != 0)
467 if (memcmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, a->size) != 0)
474 /* Cannot compare, so we assume the addresses are different */
481 bool socket_address_is(const SocketAddress *a, const char *s, int type) {
482 struct SocketAddress b;
487 if (socket_address_parse(&b, s) < 0)
492 return socket_address_equal(a, &b);
495 bool socket_address_needs_mount(const SocketAddress *a, const char *prefix) {
498 if (socket_address_family(a) != AF_UNIX)
501 if (a->sockaddr.un.sun_path[0] == 0)
504 return path_startswith(a->sockaddr.un.sun_path, prefix);
507 bool socket_ipv6_is_supported(void) {
508 return access("/sys/module/ipv6", F_OK) == 0;
511 static const char* const socket_address_bind_ipv6_only_table[_SOCKET_ADDRESS_BIND_IPV6_ONLY_MAX] = {
512 [SOCKET_ADDRESS_DEFAULT] = "default",
513 [SOCKET_ADDRESS_BOTH] = "both",
514 [SOCKET_ADDRESS_IPV6_ONLY] = "ipv6-only"
517 DEFINE_STRING_TABLE_LOOKUP(socket_address_bind_ipv6_only, SocketAddressBindIPv6Only);