-/*-*- 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 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/>.
-***/
-
-#include <string.h>
-#include <unistd.h>
-#include <errno.h>
-#include <arpa/inet.h>
-#include <stdio.h>
-#include <net/if.h>
-#include <sys/types.h>
-#include <stddef.h>
-#include <netdb.h>
-
-#include "macro.h"
-#include "path-util.h"
-#include "util.h"
-#include "socket-util.h"
-#include "missing.h"
-#include "fileio.h"
-#include "formats-util.h"
-
-int socket_address_parse(SocketAddress *a, const char *s) {
- char *e, *n;
- unsigned u;
- int r;
-
- assert(a);
- assert(s);
-
- zero(*a);
- a->type = SOCK_STREAM;
-
- if (*s == '[') {
- /* IPv6 in [x:.....:z]:p notation */
-
- e = strchr(s+1, ']');
- if (!e)
- return -EINVAL;
-
- n = strndupa(s+1, e-s-1);
-
- errno = 0;
- if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0)
- return errno > 0 ? -errno : -EINVAL;
-
- e++;
- if (*e != ':')
- return -EINVAL;
-
- e++;
- r = safe_atou(e, &u);
- if (r < 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 {
- e = strchr(s, ':');
- if (e) {
- r = safe_atou(e+1, &u);
- if (r < 0)
- return r;
-
- if (u <= 0 || u > 0xFFFF)
- return -EINVAL;
-
- n = strndupa(s, e-s);
-
- /* IPv4 in w.x.y.z:p notation? */
- r = inet_pton(AF_INET, n, &a->sockaddr.in.sin_addr);
- if (r < 0)
- return -errno;
-
- if (r > 0) {
- /* Gotcha, it's a traditional IPv4 address */
- a->sockaddr.in.sin_family = AF_INET;
- a->sockaddr.in.sin_port = htons((uint16_t) u);
- a->size = sizeof(struct sockaddr_in);
- } else {
- unsigned idx;
-
- if (strlen(n) > IF_NAMESIZE-1)
- return -EINVAL;
-
- /* Uh, our last resort, an interface name */
- idx = if_nametoindex(n);
- if (idx == 0)
- return -EINVAL;
-
- 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 */
- r = safe_atou(s, &u);
- if (r < 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.in.sin_family = AF_INET;
- a->sockaddr.in.sin_port = htons((uint16_t) u);
- a->sockaddr.in.sin_addr.s_addr = INADDR_ANY;
- a->size = sizeof(struct sockaddr_in);
- }
- }
- }
-
- return 0;
-}
-
-int socket_address_parse_and_warn(SocketAddress *a, const char *s) {
- SocketAddress b;
- int r;
-
- /* Similar to socket_address_parse() but warns for IPv6 sockets when we don't support them. */
-
- r = socket_address_parse(&b, s);
- if (r < 0)
- return r;
-
- if (!socket_ipv6_is_supported() && b.sockaddr.sa.sa_family == AF_INET6) {
- log_warning("Binding to IPv6 address not available since kernel does not support IPv6.");
- return -EAFNOSUPPORT;
- }
-
- *a = b;
- return 0;
-}
-
-int socket_address_parse_netlink(SocketAddress *a, const char *s) {
- int family;
- unsigned group = 0;
- _cleanup_free_ 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 > 0 ? -errno : -EINVAL;
-
- family = netlink_family_from_string(sfamily);
- if (family < 0)
- return -EINVAL;
-
- 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.in.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 */
- e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path));
- if (!e)
- 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 **ret) {
- int r;
-
- assert(a);
- assert(ret);
-
- r = socket_address_verify(a);
- if (r < 0)
- return r;
-
- if (socket_address_family(a) == AF_NETLINK) {
- _cleanup_free_ char *sfamily = NULL;
-
- r = netlink_family_to_string_alloc(a->protocol, &sfamily);
- if (r < 0)
- return r;
-
- r = asprintf(ret, "%s %u", sfamily, a->sockaddr.nl.nl_groups);
- if (r < 0)
- return -ENOMEM;
-
- return 0;
- }
-
- return sockaddr_pretty(&a->sockaddr.sa, a->size, false, true, ret);
-}
-
-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 (socket_address_family(a) != socket_address_family(b))
- return false;
-
- switch (socket_address_family(a)) {
-
- case AF_INET:
- if (a->sockaddr.in.sin_addr.s_addr != b->sockaddr.in.sin_addr.s_addr)
- return false;
-
- if (a->sockaddr.in.sin_port != b->sockaddr.in.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->size <= offsetof(struct sockaddr_un, sun_path) ||
- b->size <= offsetof(struct sockaddr_un, sun_path))
- return false;
-
- 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 (!path_equal_or_files_same(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path))
- return false;
- } else {
- if (a->size != b->size)
- return false;
-
- 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);
-}
-
-const char* socket_address_get_path(const SocketAddress *a) {
- assert(a);
-
- if (socket_address_family(a) != AF_UNIX)
- return NULL;
-
- if (a->sockaddr.un.sun_path[0] == 0)
- return NULL;
-
- return a->sockaddr.un.sun_path;
-}
-
-bool socket_ipv6_is_supported(void) {
- _cleanup_free_ char *l = NULL;
-
- if (access("/sys/module/ipv6", F_OK) != 0)
- return false;
-
- /* If we can't check "disable" parameter, assume enabled */
- if (read_one_line_file("/sys/module/ipv6/parameters/disable", &l) < 0)
- return true;
-
- /* If module was loaded with disable=1 no IPv6 available */
- return l[0] == '0';
-}
-
-bool socket_address_matches_fd(const SocketAddress *a, int fd) {
- SocketAddress b;
- socklen_t solen;
-
- assert(a);
- assert(fd >= 0);
-
- b.size = sizeof(b.sockaddr);
- if (getsockname(fd, &b.sockaddr.sa, &b.size) < 0)
- return false;
-
- if (b.sockaddr.sa.sa_family != a->sockaddr.sa.sa_family)
- return false;
-
- solen = sizeof(b.type);
- if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &b.type, &solen) < 0)
- return false;
-
- if (b.type != a->type)
- return false;
-
- if (a->protocol != 0) {
- solen = sizeof(b.protocol);
- if (getsockopt(fd, SOL_SOCKET, SO_PROTOCOL, &b.protocol, &solen) < 0)
- return false;
-
- if (b.protocol != a->protocol)
- return false;
- }
-
- return socket_address_equal(a, &b);
-}
-
-int sockaddr_port(const struct sockaddr *_sa) {
- union sockaddr_union *sa = (union sockaddr_union*) _sa;
-
- assert(sa);
-
- if (!IN_SET(sa->sa.sa_family, AF_INET, AF_INET6))
- return -EAFNOSUPPORT;
-
- return ntohs(sa->sa.sa_family == AF_INET6 ?
- sa->in6.sin6_port :
- sa->in.sin_port);
-}
-
-int sockaddr_pretty(const struct sockaddr *_sa, socklen_t salen, bool translate_ipv6, bool include_port, char **ret) {
- union sockaddr_union *sa = (union sockaddr_union*) _sa;
- char *p;
- int r;
-
- assert(sa);
- assert(salen >= sizeof(sa->sa.sa_family));
-
- switch (sa->sa.sa_family) {
-
- case AF_INET: {
- uint32_t a;
-
- a = ntohl(sa->in.sin_addr.s_addr);
-
- if (include_port)
- r = asprintf(&p,
- "%u.%u.%u.%u:%u",
- a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
- ntohs(sa->in.sin_port));
- else
- r = asprintf(&p,
- "%u.%u.%u.%u",
- a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF);
- if (r < 0)
- return -ENOMEM;
- break;
- }
-
- case AF_INET6: {
- static const unsigned char ipv4_prefix[] = {
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
- };
-
- if (translate_ipv6 &&
- memcmp(&sa->in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
- const uint8_t *a = sa->in6.sin6_addr.s6_addr+12;
- if (include_port)
- r = asprintf(&p,
- "%u.%u.%u.%u:%u",
- a[0], a[1], a[2], a[3],
- ntohs(sa->in6.sin6_port));
- else
- r = asprintf(&p,
- "%u.%u.%u.%u",
- a[0], a[1], a[2], a[3]);
- if (r < 0)
- return -ENOMEM;
- } else {
- char a[INET6_ADDRSTRLEN];
-
- inet_ntop(AF_INET6, &sa->in6.sin6_addr, a, sizeof(a));
-
- if (include_port) {
- r = asprintf(&p,
- "[%s]:%u",
- a,
- ntohs(sa->in6.sin6_port));
- if (r < 0)
- return -ENOMEM;
- } else {
- p = strdup(a);
- if (!p)
- return -ENOMEM;
- }
- }
-
- break;
- }
-
- case AF_UNIX:
- if (salen <= offsetof(struct sockaddr_un, sun_path)) {
- p = strdup("<unnamed>");
- if (!p)
- return -ENOMEM;
-
- } else if (sa->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 */
-
- p = new(char, sizeof(sa->un.sun_path)+1);
- if (!p)
- return -ENOMEM;
-
- p[0] = '@';
- memcpy(p+1, sa->un.sun_path+1, sizeof(sa->un.sun_path)-1);
- p[sizeof(sa->un.sun_path)] = 0;
-
- } else {
- p = strndup(sa->un.sun_path, sizeof(sa->un.sun_path));
- if (!ret)
- return -ENOMEM;
- }
-
- break;
-
- default:
- return -EOPNOTSUPP;
- }
-
-
- *ret = p;
- return 0;
-}
-
-int getpeername_pretty(int fd, char **ret) {
- union sockaddr_union sa;
- socklen_t salen = sizeof(sa);
- int r;
-
- assert(fd >= 0);
- assert(ret);
-
- if (getpeername(fd, &sa.sa, &salen) < 0)
- return -errno;
-
- if (sa.sa.sa_family == AF_UNIX) {
- struct ucred ucred = {};
-
- /* UNIX connection sockets are anonymous, so let's use
- * PID/UID as pretty credentials instead */
-
- r = getpeercred(fd, &ucred);
- if (r < 0)
- return r;
-
- if (asprintf(ret, "PID "PID_FMT"/UID "UID_FMT, ucred.pid, ucred.uid) < 0)
- return -ENOMEM;
-
- return 0;
- }
-
- /* For remote sockets we translate IPv6 addresses back to IPv4
- * if applicable, since that's nicer. */
-
- return sockaddr_pretty(&sa.sa, salen, true, true, ret);
-}
-
-int getsockname_pretty(int fd, char **ret) {
- union sockaddr_union sa;
- socklen_t salen = sizeof(sa);
-
- assert(fd >= 0);
- assert(ret);
-
- if (getsockname(fd, &sa.sa, &salen) < 0)
- return -errno;
-
- /* For local sockets we do not translate IPv6 addresses back
- * to IPv6 if applicable, since this is usually used for
- * listening sockets where the difference between IPv4 and
- * IPv6 matters. */
-
- return sockaddr_pretty(&sa.sa, salen, false, true, ret);
-}
-
-int socknameinfo_pretty(union sockaddr_union *sa, socklen_t salen, char **_ret) {
- int r;
- char host[NI_MAXHOST], *ret;
-
- assert(_ret);
-
- r = getnameinfo(&sa->sa, salen, host, sizeof(host), NULL, 0,
- NI_IDN|NI_IDN_USE_STD3_ASCII_RULES);
- if (r != 0) {
- int saved_errno = errno;
-
- r = sockaddr_pretty(&sa->sa, salen, true, true, &ret);
- if (r < 0)
- return r;
-
- log_debug_errno(saved_errno, "getnameinfo(%s) failed: %m", ret);
- } else {
- ret = strdup(host);
- if (!ret)
- return -ENOMEM;
- }
-
- *_ret = ret;
- return 0;
-}
-
-int getnameinfo_pretty(int fd, char **ret) {
- union sockaddr_union sa;
- socklen_t salen = sizeof(sa);
-
- assert(fd >= 0);
- assert(ret);
-
- if (getsockname(fd, &sa.sa, &salen) < 0)
- return -errno;
-
- return socknameinfo_pretty(&sa, salen, ret);
-}
-
-int socket_address_unlink(SocketAddress *a) {
- assert(a);
-
- if (socket_address_family(a) != AF_UNIX)
- return 0;
-
- if (a->sockaddr.un.sun_path[0] == 0)
- return 0;
-
- if (unlink(a->sockaddr.un.sun_path) < 0)
- return -errno;
-
- return 1;
-}
-
-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_WITH_FALLBACK(netlink_family, int, INT_MAX);
-
-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);
-
-bool sockaddr_equal(const union sockaddr_union *a, const union sockaddr_union *b) {
- assert(a);
- assert(b);
-
- if (a->sa.sa_family != b->sa.sa_family)
- return false;
-
- if (a->sa.sa_family == AF_INET)
- return a->in.sin_addr.s_addr == b->in.sin_addr.s_addr;
-
- if (a->sa.sa_family == AF_INET6)
- return memcmp(&a->in6.sin6_addr, &b->in6.sin6_addr, sizeof(a->in6.sin6_addr)) == 0;
-
- return false;
-}
-
-char* ether_addr_to_string(const struct ether_addr *addr, char buffer[ETHER_ADDR_TO_STRING_MAX]) {
- assert(addr);
- assert(buffer);
-
- /* Like ether_ntoa() but uses %02x instead of %x to print
- * ethernet addresses, which makes them look less funny. Also,
- * doesn't use a static buffer. */
-
- sprintf(buffer, "%02x:%02x:%02x:%02x:%02x:%02x",
- addr->ether_addr_octet[0],
- addr->ether_addr_octet[1],
- addr->ether_addr_octet[2],
- addr->ether_addr_octet[3],
- addr->ether_addr_octet[4],
- addr->ether_addr_octet[5]);
-
- return buffer;
-}
~ianmdlvl / elogind.git / blobdiff