From 7a22745ac3c267edf89a23a920a28d86df5d0f9a Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Sun, 10 Apr 2011 03:27:00 +0200 Subject: [PATCH] socket: support netlink sockets --- man/systemd.socket.xml | 16 +++ src/load-fragment.c | 10 ++ src/socket-util.c | 279 +++++++++++++++++++++++++++++------------ src/socket-util.h | 11 ++ src/socket.c | 31 ++++- 5 files changed, 261 insertions(+), 86 deletions(-) diff --git a/man/systemd.socket.xml b/man/systemd.socket.xml index 8cbb512e..306e6883 100644 --- a/man/systemd.socket.xml +++ b/man/systemd.socket.xml @@ -218,6 +218,22 @@ directive above. + + ListenNetlink= + Specifies a Netlink + family to create a socket for to + listen on. This expects a short string + referring to the AF_NETLINK family + name (such as audit + or kobject-uevent) + as argument, optionally suffixed by a + whitespace followed by a multicast + group integer. Behaviour otherwise is + very similar to the + ListenDatagram= + directive above. + + BindIPv6Only= Takes a one of diff --git a/src/load-fragment.c b/src/load-fragment.c index aac27b56..3440d915 100644 --- a/src/load-fragment.c +++ b/src/load-fragment.c @@ -220,6 +220,15 @@ static int config_parse_listen( } path_kill_slashes(p->path); + } else if (streq(lvalue, "ListenNetlink")) { + p->type = SOCKET_SOCKET; + + if (socket_address_parse_netlink(&p->address, rvalue) < 0) { + log_error("[%s:%u] Failed to parse address value, ignoring: %s", filename, line, rvalue); + free(p); + return 0; + } + } else { p->type = SOCKET_SOCKET; @@ -1892,6 +1901,7 @@ static int load_from_path(Unit *u, const char *path) { { "ListenDatagram", config_parse_listen, 0, &u->socket, "Socket" }, { "ListenSequentialPacket", config_parse_listen, 0, &u->socket, "Socket" }, { "ListenFIFO", config_parse_listen, 0, &u->socket, "Socket" }, + { "ListenNetlink", config_parse_listen, 0, &u->socket, "Socket" }, { "BindIPv6Only", config_parse_socket_bind, 0, &u->socket, "Socket" }, { "Backlog", config_parse_unsigned, 0, &u->socket.backlog, "Socket" }, { "BindToDevice", config_parse_bindtodevice, 0, &u->socket, "Socket" }, diff --git a/src/socket-util.c b/src/socket-util.c index 9b4a1b3b..4c28946b 100644 --- a/src/socket-util.c +++ b/src/socket-util.c @@ -189,50 +189,102 @@ int socket_address_parse(SocketAddress *a, const char *s) { 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; + case AF_INET: + if (a->size != sizeof(struct sockaddr_in)) + return -EINVAL; - return 0; + if (a->sockaddr.in4.sin_port == 0) + return -EINVAL; - case AF_INET6: - if (a->size != sizeof(struct sockaddr_in6)) - return -EINVAL; + if (a->type != SOCK_STREAM && a->type != SOCK_DGRAM) + return -EINVAL; - if (a->sockaddr.in6.sin6_port == 0) - return -EINVAL; + return 0; + + case AF_INET6: + if (a->size != sizeof(struct sockaddr_in6)) + return -EINVAL; - return 0; + if (a->sockaddr.in6.sin6_port == 0) + return -EINVAL; - case AF_UNIX: - if (a->size < offsetof(struct sockaddr_un, sun_path)) - return -EINVAL; + if (a->type != SOCK_STREAM && a->type != SOCK_DGRAM) + return -EINVAL; - if (a->size > offsetof(struct sockaddr_un, sun_path)) { + return 0; - if (a->sockaddr.un.sun_path[0] != 0) { - char *e; + case AF_UNIX: + if (a->size < offsetof(struct sockaddr_un, sun_path)) + return -EINVAL; - /* 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)) { - if (a->size != offsetof(struct sockaddr_un, sun_path) + (e - a->sockaddr.un.sun_path) + 1) - return -EINVAL; - } + 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; } + } - return 0; + if (a->type != SOCK_STREAM && a->type != SOCK_DGRAM && a->type == SOCK_SEQPACKET) + return -EINVAL; - default: - return -EAFNOSUPPORT; + 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; } } @@ -245,74 +297,89 @@ int socket_address_print(const SocketAddress *a, char **p) { return r; switch (socket_address_family(a)) { - case AF_INET: { - char *ret; - if (!(ret = new(char, INET_ADDRSTRLEN+1+5+1))) - return -ENOMEM; + case AF_INET: { + char *ret; - if (!inet_ntop(AF_INET, &a->sockaddr.in4.sin_addr, ret, INET_ADDRSTRLEN)) { - free(ret); - return -errno; - } + if (!(ret = new(char, INET_ADDRSTRLEN+1+5+1))) + return -ENOMEM; - sprintf(strchr(ret, 0), ":%u", ntohs(a->sockaddr.in4.sin_port)); - *p = ret; - return 0; + if (!inet_ntop(AF_INET, &a->sockaddr.in4.sin_addr, ret, INET_ADDRSTRLEN)) { + free(ret); + return -errno; } - case AF_INET6: { - char *ret; + sprintf(strchr(ret, 0), ":%u", ntohs(a->sockaddr.in4.sin_port)); + *p = ret; + return 0; + } - if (!(ret = new(char, 1+INET6_ADDRSTRLEN+2+5+1))) - return -ENOMEM; + case AF_INET6: { + char *ret; - ret[0] = '['; - if (!inet_ntop(AF_INET6, &a->sockaddr.in6.sin6_addr, ret+1, INET6_ADDRSTRLEN)) { - free(ret); - return -errno; - } + if (!(ret = new(char, 1+INET6_ADDRSTRLEN+2+5+1))) + return -ENOMEM; - sprintf(strchr(ret, 0), "]:%u", ntohs(a->sockaddr.in6.sin6_port)); - *p = ret; - return 0; + ret[0] = '['; + if (!inet_ntop(AF_INET6, &a->sockaddr.in6.sin6_addr, ret+1, INET6_ADDRSTRLEN)) { + free(ret); + return -errno; } - case AF_UNIX: { - char *ret; + sprintf(strchr(ret, 0), "]:%u", ntohs(a->sockaddr.in6.sin6_port)); + *p = ret; + return 0; + } - if (a->size <= offsetof(struct sockaddr_un, sun_path)) { + case AF_UNIX: { + char *ret; - if (!(ret = strdup(""))) - return -ENOMEM; + if (a->size <= offsetof(struct sockaddr_un, sun_path)) { - } else if (a->sockaddr.un.sun_path[0] == 0) { - /* abstract */ + if (!(ret = strdup(""))) + return -ENOMEM; - /* 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 */ + } else if (a->sockaddr.un.sun_path[0] == 0) { + /* abstract */ - if (!(ret = new(char, sizeof(a->sockaddr.un.sun_path)+1))) - return -ENOMEM; + /* 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 */ - 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; + if (!(ret = new(char, sizeof(a->sockaddr.un.sun_path)+1))) + return -ENOMEM; - } else { + 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; - if (!(ret = strdup(a->sockaddr.un.sun_path))) - return -ENOMEM; - } + } else { - *p = ret; - return 0; + if (!(ret = strdup(a->sockaddr.un.sun_path))) + return -ENOMEM; } - default: - return -EINVAL; + *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; } } @@ -341,7 +408,7 @@ int socket_address_listen( if (r < 0) return r; - fd = socket(socket_address_family(a), a->type | SOCK_NONBLOCK | SOCK_CLOEXEC, 0); + fd = socket(socket_address_family(a), a->type | SOCK_NONBLOCK | SOCK_CLOEXEC, a->protocol); r = fd < 0 ? -errno : 0; label_socket_clear(); @@ -356,14 +423,16 @@ int socket_address_listen( goto fail; } - if (bind_to_device) - if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, bind_to_device, strlen(bind_to_device)+1) < 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 (free_bind) { + one = 1; + if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &one, sizeof(one)) < 0) + log_warning("IP_FREEBIND failed: %m"); + } } one = 1; @@ -397,7 +466,7 @@ int socket_address_listen( if (r < 0) goto fail; - if (a->type == SOCK_STREAM) + if (socket_address_can_accept(a)) if (listen(fd, backlog) < 0) goto fail; @@ -471,6 +540,16 @@ bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) { 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; @@ -493,6 +572,18 @@ bool socket_address_is(const SocketAddress *a, const char *s, int 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); @@ -523,6 +614,28 @@ bool socket_ipv6_is_supported(void) { 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", diff --git a/src/socket-util.h b/src/socket-util.h index 4743c376..0e891ec2 100644 --- a/src/socket-util.h +++ b/src/socket-util.h @@ -26,6 +26,8 @@ #include #include #include +#include +#include #include "macro.h" #include "util.h" @@ -35,6 +37,7 @@ union sockaddr_union { struct sockaddr_in in4; struct sockaddr_in6 in6; struct sockaddr_un un; + struct sockaddr_nl nl; struct sockaddr_storage storage; }; @@ -47,6 +50,9 @@ typedef struct SocketAddress { /* Socket type, i.e. SOCK_STREAM, SOCK_DGRAM, ... */ int type; + + /* Socket protocol, IPPROTO_xxx, usually 0, except for netlink */ + int protocol; } SocketAddress; typedef enum SocketAddressBindIPv6Only { @@ -60,6 +66,7 @@ typedef enum SocketAddressBindIPv6Only { #define socket_address_family(a) ((a)->sockaddr.sa.sa_family) int socket_address_parse(SocketAddress *a, const char *s); +int socket_address_parse_netlink(SocketAddress *a, const char *s); int socket_address_print(const SocketAddress *a, char **p); int socket_address_verify(const SocketAddress *a); @@ -77,6 +84,7 @@ int socket_address_listen( int *ret); bool socket_address_is(const SocketAddress *a, const char *s, int type); +bool socket_address_is_netlink(const SocketAddress *a, const char *s); bool socket_address_equal(const SocketAddress *a, const SocketAddress *b); @@ -85,6 +93,9 @@ bool socket_address_needs_mount(const SocketAddress *a, const char *prefix); const char* socket_address_bind_ipv6_only_to_string(SocketAddressBindIPv6Only b); SocketAddressBindIPv6Only socket_address_bind_ipv6_only_from_string(const char *s); +const char* netlink_family_to_string(int b); +int netlink_family_from_string(const char *s); + bool socket_ipv6_is_supported(void); #endif diff --git a/src/socket.c b/src/socket.c index beb32865..80adf168 100644 --- a/src/socket.c +++ b/src/socket.c @@ -366,7 +366,10 @@ static int socket_load(Unit *u) { return socket_verify(s); } -static const char* listen_lookup(int type) { +static const char* listen_lookup(int family, int type) { + + if (family == AF_NETLINK) + return "ListenNetlink"; if (type == SOCK_STREAM) return "ListenStream"; @@ -477,7 +480,7 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) { else t = k; - fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), t); + fprintf(f, "%s%s: %s\n", prefix, listen_lookup(socket_address_family(&p->address), p->address.type), t); free(k); } else fprintf(f, "%sListenFIFO: %s\n", prefix, p->path); @@ -1447,7 +1450,10 @@ static int socket_serialize(Unit *u, FILE *f, FDSet *fds) { if ((r = socket_address_print(&p->address, &t)) < 0) return r; - unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t); + if (socket_address_family(&p->address) == AF_NETLINK) + unit_serialize_item_format(u, f, "netlink", "%i %s", copy, t); + else + unit_serialize_item_format(u, f, "socket", "%i %i %s", copy, p->address.type, t); free(t); } else { assert(p->type == SOCKET_FIFO); @@ -1542,6 +1548,25 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value, } } + } else if (streq(key, "netlink")) { + int fd, skip = 0; + SocketPort *p; + + if (sscanf(value, "%i %n", &fd, &skip) < 1 || fd < 0 || !fdset_contains(fds, fd)) + log_debug("Failed to parse socket value %s", value); + else { + + LIST_FOREACH(port, p, s->ports) + if (socket_address_is_netlink(&p->address, value+skip)) + break; + + if (p) { + if (p->fd >= 0) + close_nointr_nofail(p->fd); + p->fd = fdset_remove(fds, fd); + } + } + } else log_debug("Unknown serialization key '%s'", key); -- 2.39.5