+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 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
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <assert.h>
-#include <string.h>
-#include <unistd.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <arpa/inet.h>
-#include <stdio.h>
-#include <net/if.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <stddef.h>
-#include <sys/ioctl.h>
-
-#include "macro.h"
-#include "util.h"
-#include "socket-util.h"
-#include "missing.h"
-#include "label.h"
-
-int socket_address_parse(SocketAddress *a, const char *s) {
- int r;
- char *e, *n;
- unsigned u;
-
- assert(a);
- assert(s);
-
- zero(*a);
- a->type = SOCK_STREAM;
-
- if (*s == '[') {
- /* IPv6 in [x:.....:z]:p notation */
-
- if (!socket_ipv6_is_supported()) {
- log_warning("Binding to IPv6 address not available since kernel does not support IPv6.");
- return -EAFNOSUPPORT;
- }
-
- if (!(e = strchr(s+1, ']')))
- return -EINVAL;
-
- if (!(n = strndup(s+1, e-s-1)))
- return -ENOMEM;
-
- errno = 0;
- if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0) {
- free(n);
- return errno != 0 ? -errno : -EINVAL;
- }
-
- free(n);
-
- e++;
- if (*e != ':')
- return -EINVAL;
-
- e++;
- if ((r = safe_atou(e, &u)) < 0)
- return r;
-
- if (u <= 0 || u > 0xFFFF)
- return -EINVAL;
-
- a->sockaddr.in6.sin6_family = AF_INET6;
- a->sockaddr.in6.sin6_port = htons((uint16_t) u);
- a->size = sizeof(struct sockaddr_in6);
-
- } else if (*s == '/') {
- /* AF_UNIX socket */
-
- size_t l;
-
- l = strlen(s);
- if (l >= sizeof(a->sockaddr.un.sun_path))
- return -EINVAL;
-
- a->sockaddr.un.sun_family = AF_UNIX;
- memcpy(a->sockaddr.un.sun_path, s, l);
- a->size = offsetof(struct sockaddr_un, sun_path) + l + 1;
-
- } else if (*s == '@') {
- /* Abstract AF_UNIX socket */
- size_t l;
-
- l = strlen(s+1);
- if (l >= sizeof(a->sockaddr.un.sun_path) - 1)
- return -EINVAL;
-
- a->sockaddr.un.sun_family = AF_UNIX;
- memcpy(a->sockaddr.un.sun_path+1, s+1, l);
- a->size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
-
- } else {
-
- if ((e = strchr(s, ':'))) {
-
- if ((r = safe_atou(e+1, &u)) < 0)
- return r;
-
- if (u <= 0 || u > 0xFFFF)
- return -EINVAL;
-
- if (!(n = strndup(s, e-s)))
- return -ENOMEM;
-
- /* IPv4 in w.x.y.z:p notation? */
- if ((r = inet_pton(AF_INET, n, &a->sockaddr.in4.sin_addr)) < 0) {
- free(n);
- return -errno;
- }
-
- if (r > 0) {
- /* Gotcha, it's a traditional IPv4 address */
- free(n);
-
- a->sockaddr.in4.sin_family = AF_INET;
- a->sockaddr.in4.sin_port = htons((uint16_t) u);
- a->size = sizeof(struct sockaddr_in);
- } else {
- unsigned idx;
-
- if (strlen(n) > IF_NAMESIZE-1) {
- free(n);
- return -EINVAL;
- }
-
- /* Uh, our last resort, an interface name */
- idx = if_nametoindex(n);
- free(n);
-
- if (idx == 0)
- return -EINVAL;
-
- if (!socket_ipv6_is_supported()) {
- log_warning("Binding to interface is not available since kernel does not support IPv6.");
- return -EAFNOSUPPORT;
- }
-
- a->sockaddr.in6.sin6_family = AF_INET6;
- a->sockaddr.in6.sin6_port = htons((uint16_t) u);
- a->sockaddr.in6.sin6_scope_id = idx;
- a->sockaddr.in6.sin6_addr = in6addr_any;
- a->size = sizeof(struct sockaddr_in6);
- }
- } else {
-
- /* Just a port */
- if ((r = safe_atou(s, &u)) < 0)
- return r;
-
- if (u <= 0 || u > 0xFFFF)
- return -EINVAL;
-
- if (socket_ipv6_is_supported()) {
- a->sockaddr.in6.sin6_family = AF_INET6;
- a->sockaddr.in6.sin6_port = htons((uint16_t) u);
- a->sockaddr.in6.sin6_addr = in6addr_any;
- a->size = sizeof(struct sockaddr_in6);
- } else {
- a->sockaddr.in4.sin_family = AF_INET;
- a->sockaddr.in4.sin_port = htons((uint16_t) u);
- a->sockaddr.in4.sin_addr.s_addr = INADDR_ANY;
- a->size = sizeof(struct sockaddr_in);
- }
- }
- }
-
- return 0;
-}
-
-int socket_address_parse_netlink(SocketAddress *a, const char *s) {
- int family;
- unsigned group = 0;
- char* sfamily = NULL;
- assert(a);
- assert(s);
-
- zero(*a);
- a->type = SOCK_RAW;
-
- errno = 0;
- if (sscanf(s, "%ms %u", &sfamily, &group) < 1)
- return errno ? -errno : -EINVAL;
-
- if ((family = netlink_family_from_string(sfamily)) < 0)
- if (safe_atoi(sfamily, &family) < 0) {
- free(sfamily);
- return -EINVAL;
- }
-
- free(sfamily);
-
- a->sockaddr.nl.nl_family = AF_NETLINK;
- a->sockaddr.nl.nl_groups = group;
-
- a->type = SOCK_RAW;
- a->size = sizeof(struct sockaddr_nl);
- a->protocol = family;
-
- return 0;
-}
-
-int socket_address_verify(const SocketAddress *a) {
- assert(a);
-
- switch (socket_address_family(a)) {
-
- case AF_INET:
- if (a->size != sizeof(struct sockaddr_in))
- return -EINVAL;
-
- if (a->sockaddr.in4.sin_port == 0)
- return -EINVAL;
-
- if (a->type != SOCK_STREAM && a->type != SOCK_DGRAM)
- return -EINVAL;
-
- return 0;
-
- case AF_INET6:
- if (a->size != sizeof(struct sockaddr_in6))
- return -EINVAL;
-
- if (a->sockaddr.in6.sin6_port == 0)
- return -EINVAL;
-
- if (a->type != SOCK_STREAM && a->type != SOCK_DGRAM)
- return -EINVAL;
-
- return 0;
-
- case AF_UNIX:
- if (a->size < offsetof(struct sockaddr_un, sun_path))
- return -EINVAL;
-
- if (a->size > offsetof(struct sockaddr_un, sun_path)) {
-
- if (a->sockaddr.un.sun_path[0] != 0) {
- char *e;
-
- /* path */
- if (!(e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path))))
- return -EINVAL;
-
- if (a->size != offsetof(struct sockaddr_un, sun_path) + (e - a->sockaddr.un.sun_path) + 1)
- return -EINVAL;
- }
- }
-
- if (a->type != SOCK_STREAM && a->type != SOCK_DGRAM && a->type != SOCK_SEQPACKET)
- return -EINVAL;
-
- return 0;
-
- case AF_NETLINK:
-
- if (a->size != sizeof(struct sockaddr_nl))
- return -EINVAL;
-
- if (a->type != SOCK_RAW && a->type != SOCK_DGRAM)
- return -EINVAL;
-
- return 0;
-
- default:
- return -EAFNOSUPPORT;
- }
-}
-
-int socket_address_print(const SocketAddress *a, char **p) {
- int r;
- assert(a);
- assert(p);
-
- if ((r = socket_address_verify(a)) < 0)
- return r;
-
- switch (socket_address_family(a)) {
-
- case AF_INET: {
- char *ret;
-
- if (!(ret = new(char, INET_ADDRSTRLEN+1+5+1)))
- return -ENOMEM;
-
- if (!inet_ntop(AF_INET, &a->sockaddr.in4.sin_addr, ret, INET_ADDRSTRLEN)) {
- free(ret);
- return -errno;
- }
-
- sprintf(strchr(ret, 0), ":%u", ntohs(a->sockaddr.in4.sin_port));
- *p = ret;
- return 0;
- }
-
- case AF_INET6: {
- char *ret;
-
- if (!(ret = new(char, 1+INET6_ADDRSTRLEN+2+5+1)))
- return -ENOMEM;
-
- ret[0] = '[';
- if (!inet_ntop(AF_INET6, &a->sockaddr.in6.sin6_addr, ret+1, INET6_ADDRSTRLEN)) {
- free(ret);
- return -errno;
- }
-
- sprintf(strchr(ret, 0), "]:%u", ntohs(a->sockaddr.in6.sin6_port));
- *p = ret;
- return 0;
- }
-
- case AF_UNIX: {
- char *ret;
-
- if (a->size <= offsetof(struct sockaddr_un, sun_path)) {
-
- if (!(ret = strdup("<unnamed>")))
- return -ENOMEM;
-
- } else if (a->sockaddr.un.sun_path[0] == 0) {
- /* abstract */
-
- /* FIXME: We assume we can print the
- * socket path here and that it hasn't
- * more than one NUL byte. That is
- * actually an invalid assumption */
-
- if (!(ret = new(char, sizeof(a->sockaddr.un.sun_path)+1)))
- return -ENOMEM;
-
- ret[0] = '@';
- memcpy(ret+1, a->sockaddr.un.sun_path+1, sizeof(a->sockaddr.un.sun_path)-1);
- ret[sizeof(a->sockaddr.un.sun_path)] = 0;
-
- } else {
-
- if (!(ret = strdup(a->sockaddr.un.sun_path)))
- return -ENOMEM;
- }
-
- *p = ret;
- return 0;
- }
-
- case AF_NETLINK: {
- const char *sfamily;
-
- if ((sfamily = netlink_family_to_string(a->protocol)))
- r = asprintf(p, "%s %u", sfamily, a->sockaddr.nl.nl_groups);
- else
- r = asprintf(p, "%i %u", a->protocol, a->sockaddr.nl.nl_groups);
-
- if (r < 0)
- return -ENOMEM;
-
- return 0;
- }
-
- default:
- return -EINVAL;
- }
-}
-
-int socket_address_listen(
- const SocketAddress *a,
- int backlog,
- SocketAddressBindIPv6Only only,
- const char *bind_to_device,
- bool free_bind,
- bool transparent,
- mode_t directory_mode,
- mode_t socket_mode,
- const char *label,
- int *ret) {
-
- int r, fd, one;
- assert(a);
- assert(ret);
-
- if ((r = socket_address_verify(a)) < 0)
- return r;
-
- if (socket_address_family(a) == AF_INET6 && !socket_ipv6_is_supported())
- return -EAFNOSUPPORT;
-
- r = label_socket_set(label);
- if (r < 0)
- return r;
-
- fd = socket(socket_address_family(a), a->type | SOCK_NONBLOCK | SOCK_CLOEXEC, a->protocol);
- r = fd < 0 ? -errno : 0;
-
- label_socket_clear();
-
- if (r < 0)
- return r;
-
- if (socket_address_family(a) == AF_INET6 && only != SOCKET_ADDRESS_DEFAULT) {
- int flag = only == SOCKET_ADDRESS_IPV6_ONLY;
-
- if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &flag, sizeof(flag)) < 0)
- goto fail;
- }
-
- if (socket_address_family(a) == AF_INET || socket_address_family(a) == AF_INET6) {
- if (bind_to_device)
- if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, bind_to_device, strlen(bind_to_device)+1) < 0)
- goto fail;
-
- if (free_bind) {
- one = 1;
- if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &one, sizeof(one)) < 0)
- log_warning("IP_FREEBIND failed: %m");
- }
-
- if (transparent) {
- one = 1;
- if (setsockopt(fd, IPPROTO_IP, IP_TRANSPARENT, &one, sizeof(one)) < 0)
- log_warning("IP_TRANSPARENT failed: %m");
- }
- }
-
- one = 1;
- if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0)
- goto fail;
-
- if (socket_address_family(a) == AF_UNIX && a->sockaddr.un.sun_path[0] != 0) {
- mode_t old_mask;
-
- /* Create parents */
- mkdir_parents(a->sockaddr.un.sun_path, directory_mode);
-
- /* Enforce the right access mode for the socket*/
- old_mask = umask(~ socket_mode);
-
- /* Include the original umask in our mask */
- umask(~socket_mode | old_mask);
-
- r = label_bind(fd, &a->sockaddr.sa, a->size);
-
- if (r < 0 && errno == EADDRINUSE) {
- /* Unlink and try again */
- unlink(a->sockaddr.un.sun_path);
- r = bind(fd, &a->sockaddr.sa, a->size);
- }
-
- umask(old_mask);
- } else
- r = bind(fd, &a->sockaddr.sa, a->size);
-
- if (r < 0)
- goto fail;
-
- if (socket_address_can_accept(a))
- if (listen(fd, backlog) < 0)
- goto fail;
-
- *ret = fd;
- return 0;
-
-fail:
- r = -errno;
- close_nointr_nofail(fd);
- return r;
-}
-
-bool socket_address_can_accept(const SocketAddress *a) {
- assert(a);
-
- return
- a->type == SOCK_STREAM ||
- a->type == SOCK_SEQPACKET;
-}
-
-bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) {
- assert(a);
- assert(b);
-
- /* Invalid addresses are unequal to all */
- if (socket_address_verify(a) < 0 ||
- socket_address_verify(b) < 0)
- return false;
-
- if (a->type != b->type)
- return false;
-
- if (a->size != b->size)
- return false;
-
- if (socket_address_family(a) != socket_address_family(b))
- return false;
-
- switch (socket_address_family(a)) {
-
- case AF_INET:
- if (a->sockaddr.in4.sin_addr.s_addr != b->sockaddr.in4.sin_addr.s_addr)
- return false;
-
- if (a->sockaddr.in4.sin_port != b->sockaddr.in4.sin_port)
- return false;
-
- break;
-
- case AF_INET6:
- if (memcmp(&a->sockaddr.in6.sin6_addr, &b->sockaddr.in6.sin6_addr, sizeof(a->sockaddr.in6.sin6_addr)) != 0)
- return false;
-
- if (a->sockaddr.in6.sin6_port != b->sockaddr.in6.sin6_port)
- return false;
-
- break;
-
- case AF_UNIX:
-
- if ((a->sockaddr.un.sun_path[0] == 0) != (b->sockaddr.un.sun_path[0] == 0))
- return false;
-
- if (a->sockaddr.un.sun_path[0]) {
- if (strncmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, sizeof(a->sockaddr.un.sun_path)) != 0)
- return false;
- } else {
- if (memcmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, a->size) != 0)
- return false;
- }
-
- break;
-
- case AF_NETLINK:
-
- if (a->protocol != b->protocol)
- return false;
-
- if (a->sockaddr.nl.nl_groups != b->sockaddr.nl.nl_groups)
- return false;
-
- break;
-
- default:
- /* Cannot compare, so we assume the addresses are different */
- return false;
- }
-
- return true;
-}
-
-bool socket_address_is(const SocketAddress *a, const char *s, int type) {
- struct SocketAddress b;
-
- assert(a);
- assert(s);
-
- if (socket_address_parse(&b, s) < 0)
- return false;
-
- b.type = type;
-
- return socket_address_equal(a, &b);
-}
-
-bool socket_address_is_netlink(const SocketAddress *a, const char *s) {
- struct SocketAddress b;
-
- assert(a);
- assert(s);
-
- if (socket_address_parse_netlink(&b, s) < 0)
- return false;
-
- return socket_address_equal(a, &b);
-}
-
-bool socket_address_needs_mount(const SocketAddress *a, const char *prefix) {
- assert(a);
-
- if (socket_address_family(a) != AF_UNIX)
- return false;
-
- if (a->sockaddr.un.sun_path[0] == 0)
- return false;
-
- return path_startswith(a->sockaddr.un.sun_path, prefix);
-}
-
-bool socket_ipv6_is_supported(void) {
- char *l = 0;
- bool enabled;
-
- if (access("/sys/module/ipv6", F_OK) != 0)
- return 0;
-
- /* If we can't check "disable" parameter, assume enabled */
- if (read_one_line_file("/sys/module/ipv6/parameters/disable", &l) < 0)
- return 1;
-
- /* If module was loaded with disable=1 no IPv6 available */
- enabled = l[0] == '0';
- free(l);
-
- return enabled;
-}
-
-static const char* const netlink_family_table[] = {
- [NETLINK_ROUTE] = "route",
- [NETLINK_FIREWALL] = "firewall",
- [NETLINK_INET_DIAG] = "inet-diag",
- [NETLINK_NFLOG] = "nflog",
- [NETLINK_XFRM] = "xfrm",
- [NETLINK_SELINUX] = "selinux",
- [NETLINK_ISCSI] = "iscsi",
- [NETLINK_AUDIT] = "audit",
- [NETLINK_FIB_LOOKUP] = "fib-lookup",
- [NETLINK_CONNECTOR] = "connector",
- [NETLINK_NETFILTER] = "netfilter",
- [NETLINK_IP6_FW] = "ip6-fw",
- [NETLINK_DNRTMSG] = "dnrtmsg",
- [NETLINK_KOBJECT_UEVENT] = "kobject-uevent",
- [NETLINK_GENERIC] = "generic",
- [NETLINK_SCSITRANSPORT] = "scsitransport",
- [NETLINK_ECRYPTFS] = "ecryptfs"
-};
-
-DEFINE_STRING_TABLE_LOOKUP(netlink_family, int);
-
-static const char* const socket_address_bind_ipv6_only_table[_SOCKET_ADDRESS_BIND_IPV6_ONLY_MAX] = {
- [SOCKET_ADDRESS_DEFAULT] = "default",
- [SOCKET_ADDRESS_BOTH] = "both",
- [SOCKET_ADDRESS_IPV6_ONLY] = "ipv6-only"
-};
-
-DEFINE_STRING_TABLE_LOOKUP(socket_address_bind_ipv6_only, SocketAddressBindIPv6Only);
~ianmdlvl / elogind.git / blobdiff