| /*-*- 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); |