/*
* Copyright (c) 2014 Zubin Mithra <zubin.mithra@gmail.com>
* Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
+ * Copyright (c) 2014-2018 The strace developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
-#include <linux/netlink.h>
+#include "netlink.h"
#include <linux/sock_diag.h>
#include <linux/inet_diag.h>
#include <linux/unix_diag.h>
#include <linux/netlink_diag.h>
#include <linux/rtnetlink.h>
-#include "xlat/netlink_protocols.h"
-
-#if !defined NETLINK_SOCK_DIAG && defined NETLINK_INET_DIAG
-# define NETLINK_SOCK_DIAG NETLINK_INET_DIAG
+#if HAVE_LINUX_GENETLINK_H
+#include <linux/genetlink.h>
#endif
#include <sys/un.h>
# define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) 0)->sun_path)
#endif
+#include "xstring.h"
+
typedef struct {
unsigned long inode;
char *details;
#define CACHE_MASK (CACHE_SIZE - 1)
static int
-cache_and_print_inode_details(const unsigned long inode, char *const details)
+cache_inode_details(const unsigned long inode, char *const details)
{
cache_entry *e = &cache[inode & CACHE_MASK];
free(e->details);
e->inode = inode;
e->details = details;
- tprints(details);
return 1;
}
-bool
-print_sockaddr_by_inode_cached(const unsigned long inode)
+static const char *
+get_sockaddr_by_inode_cached(const unsigned long inode)
{
const cache_entry *const e = &cache[inode & CACHE_MASK];
- if (e && inode == e->inode) {
- tprints(e->details);
+ return (e && inode == e->inode) ? e->details : NULL;
+}
+
+static bool
+print_sockaddr_by_inode_cached(const unsigned long inode)
+{
+ const char *const details = get_sockaddr_by_inode_cached(inode);
+ if (details) {
+ tprints(details);
return true;
}
return false;
}
static bool
-send_query(const int fd, void *req, size_t req_size)
+send_query(struct tcb *tcp, const int fd, void *req, size_t req_size)
{
struct sockaddr_nl nladdr = {
.nl_family = AF_NETLINK
}
static bool
-inet_send_query(const int fd, const int family, const int proto)
+inet_send_query(struct tcb *tcp, const int fd, const int family,
+ const int proto)
{
struct {
const struct nlmsghdr nlh;
.idiag_states = -1
}
};
- return send_query(fd, &req, sizeof(req));
+ return send_query(tcp, fd, &req, sizeof(req));
}
static int
-inet_parse_response(const char *const proto_name, const void *const data,
- const int data_len, const unsigned long inode)
+inet_parse_response(const void *const data, const int data_len,
+ const unsigned long inode, void *opaque_data)
{
+ const char *const proto_name = opaque_data;
const struct inet_diag_msg *const diag_msg = data;
static const char zero_addr[sizeof(struct in6_addr)];
socklen_t addr_size, text_size;
if (diag_msg->idiag_inode != inode)
return 0;
- switch(diag_msg->idiag_family) {
+ switch (diag_msg->idiag_family) {
case AF_INET:
addr_size = sizeof(struct in_addr);
text_size = INET_ADDRSTRLEN;
char src_buf[text_size];
char *details;
+ /* open/closing brackets for IPv6 addresses */
+ const char *ob = diag_msg->idiag_family == AF_INET6 ? "[" : "";
+ const char *cb = diag_msg->idiag_family == AF_INET6 ? "]" : "";
+
if (!inet_ntop(diag_msg->idiag_family, diag_msg->id.idiag_src,
src_buf, text_size))
return -1;
dst_buf, text_size))
return -1;
- if (asprintf(&details, "%s:[%s:%u->%s:%u]", proto_name,
- src_buf, ntohs(diag_msg->id.idiag_sport),
- dst_buf, ntohs(diag_msg->id.idiag_dport)) < 0)
+ if (asprintf(&details, "%s:[%s%s%s:%u->%s%s%s:%u]", proto_name,
+ ob, src_buf, cb, ntohs(diag_msg->id.idiag_sport),
+ ob, dst_buf, cb, ntohs(diag_msg->id.idiag_dport))
+ < 0)
return false;
} else {
- if (asprintf(&details, "%s:[%s:%u]", proto_name, src_buf,
+ if (asprintf(&details, "%s:[%s%s%s:%u]",
+ proto_name, ob, src_buf, cb,
ntohs(diag_msg->id.idiag_sport)) < 0)
return false;
}
- return cache_and_print_inode_details(inode, details);
+ return cache_inode_details(inode, details);
}
static bool
-receive_responses(const int fd, const unsigned long inode,
- const char *proto_name,
- int (* parser) (const char *, const void *,
- int, unsigned long))
+receive_responses(struct tcb *tcp, const int fd, const unsigned long inode,
+ const unsigned long expected_msg_type,
+ int (*parser)(const void *, int,
+ unsigned long, void *),
+ void *opaque_data)
{
static union {
struct nlmsghdr hdr;
if (!NLMSG_OK(h, ret))
return false;
for (; NLMSG_OK(h, ret); h = NLMSG_NEXT(h, ret)) {
- if (h->nlmsg_type != SOCK_DIAG_BY_FAMILY)
+ if (h->nlmsg_type != expected_msg_type)
return false;
- const int rc = parser(proto_name, NLMSG_DATA(h),
- h->nlmsg_len, inode);
+ const int rc = parser(NLMSG_DATA(h),
+ h->nlmsg_len, inode, opaque_data);
if (rc > 0)
return true;
if (rc < 0)
}
static bool
-inet_print(const int fd, const int family, const int protocol,
- const unsigned long inode, const char *proto_name)
+unix_send_query(struct tcb *tcp, const int fd, const unsigned long inode)
{
- return inet_send_query(fd, family, protocol)
- && receive_responses(fd, inode, proto_name, inet_parse_response);
-}
+ /*
+ * The kernel bug was fixed in mainline by commit v4.5-rc6~35^2~11
+ * and backported to stable/linux-4.4.y by commit v4.4.4~297.
+ */
+ const uint16_t dump_flag =
+ os_release < KERNEL_VERSION(4, 4, 4) ? NLM_F_DUMP : 0;
-static bool
-unix_send_query(const int fd, const unsigned long inode)
-{
struct {
const struct nlmsghdr nlh;
const struct unix_diag_req udr;
.nlh = {
.nlmsg_len = sizeof(req),
.nlmsg_type = SOCK_DIAG_BY_FAMILY,
- .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
+ .nlmsg_flags = NLM_F_REQUEST | dump_flag
},
.udr = {
.sdiag_family = AF_UNIX,
.udiag_ino = inode,
.udiag_states = -1,
- .udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_PEER
+ .udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_PEER,
+ .udiag_cookie = { ~0U, ~0U }
}
};
- return send_query(fd, &req, sizeof(req));
+ return send_query(tcp, fd, &req, sizeof(req));
}
static int
-unix_parse_response(const char *proto_name, const void *data,
- const int data_len, const unsigned long inode)
+unix_parse_response(const void *data, const int data_len,
+ const unsigned long inode, void *opaque_data)
{
+ const char *proto_name = opaque_data;
const struct unix_diag_msg *diag_msg = data;
struct rtattr *attr;
int rta_len = data_len - NLMSG_LENGTH(sizeof(*diag_msg));
char peer_str[3 + sizeof(peer) * 3];
if (peer)
- snprintf(peer_str, sizeof(peer_str), "->%u", peer);
+ xsprintf(peer_str, "->%u", peer);
else
peer_str[0] = '\0';
if (path[0] == '\0') {
outstr[1] = '@';
string_quote(path + 1, outstr + 2,
- path_len - 1, QUOTE_0_TERMINATED);
+ path_len - 1, QUOTE_0_TERMINATED, NULL);
} else {
string_quote(path, outstr + 1,
- path_len, QUOTE_0_TERMINATED);
+ path_len, QUOTE_0_TERMINATED, NULL);
}
path_str = outstr;
} else {
peer_str, path_str) < 0)
return -1;
- return cache_and_print_inode_details(inode, details);
+ return cache_inode_details(inode, details);
}
static bool
-netlink_send_query(const int fd, const unsigned long inode)
+netlink_send_query(struct tcb *tcp, const int fd, const unsigned long inode)
{
struct {
const struct nlmsghdr nlh;
},
.ndr = {
.sdiag_family = AF_NETLINK,
- .sdiag_protocol = NDIAG_PROTO_ALL,
- .ndiag_show = NDIAG_SHOW_MEMINFO
+ .sdiag_protocol = NDIAG_PROTO_ALL
}
};
- return send_query(fd, &req, sizeof(req));
+ return send_query(tcp, fd, &req, sizeof(req));
}
static int
-netlink_parse_response(const char *proto_name, const void *data,
- const int data_len, const unsigned long inode)
+netlink_parse_response(const void *data, const int data_len,
+ const unsigned long inode, void *opaque_data)
{
+ const char *proto_name = opaque_data;
const struct netlink_diag_msg *const diag_msg = data;
const char *netlink_proto;
char *details;
diag_msg->ndiag_protocol);
if (netlink_proto) {
- static const char netlink_prefix[] = "NETLINK_";
- const size_t netlink_prefix_len =
- sizeof(netlink_prefix) -1;
- if (strncmp(netlink_proto, netlink_prefix,
- netlink_prefix_len) == 0)
- netlink_proto += netlink_prefix_len;
+ netlink_proto = STR_STRIP_PREFIX(netlink_proto, "NETLINK_");
if (asprintf(&details, "%s:[%s:%u]", proto_name,
netlink_proto, diag_msg->ndiag_portid) < 0)
return -1;
return -1;
}
- return cache_and_print_inode_details(inode, details);
+ return cache_inode_details(inode, details);
}
-static bool
-unix_print(const int fd, const unsigned long inode)
+static const char *
+unix_get(struct tcb *tcp, const int fd, const unsigned long inode)
{
- return unix_send_query(fd, inode)
- && receive_responses(fd, inode, "UNIX", unix_parse_response);
+ return unix_send_query(tcp, fd, inode)
+ && receive_responses(tcp, fd, inode, SOCK_DIAG_BY_FAMILY,
+ unix_parse_response, (void *) "UNIX")
+ ? get_sockaddr_by_inode_cached(inode) : NULL;
}
-static bool
-tcp_v4_print(const int fd, const unsigned long inode)
+static const char *
+inet_get(struct tcb *tcp, const int fd, const int family, const int protocol,
+ const unsigned long inode, const char *proto_name)
{
- return inet_print(fd, AF_INET, IPPROTO_TCP, inode, "TCP");
+ return inet_send_query(tcp, fd, family, protocol)
+ && receive_responses(tcp, fd, inode, SOCK_DIAG_BY_FAMILY,
+ inet_parse_response, (void *) proto_name)
+ ? get_sockaddr_by_inode_cached(inode) : NULL;
}
-static bool
-udp_v4_print(const int fd, const unsigned long inode)
+static const char *
+tcp_v4_get(struct tcb *tcp, const int fd, const unsigned long inode)
{
- return inet_print(fd, AF_INET, IPPROTO_UDP, inode, "UDP");
+ return inet_get(tcp, fd, AF_INET, IPPROTO_TCP, inode, "TCP");
}
-static bool
-tcp_v6_print(const int fd, const unsigned long inode)
+static const char *
+udp_v4_get(struct tcb *tcp, const int fd, const unsigned long inode)
{
- return inet_print(fd, AF_INET6, IPPROTO_TCP, inode, "TCPv6");
+ return inet_get(tcp, fd, AF_INET, IPPROTO_UDP, inode, "UDP");
}
-static bool
-udp_v6_print(const int fd, const unsigned long inode)
+static const char *
+tcp_v6_get(struct tcb *tcp, const int fd, const unsigned long inode)
{
- return inet_print(fd, AF_INET6, IPPROTO_UDP, inode, "UDPv6");
+ return inet_get(tcp, fd, AF_INET6, IPPROTO_TCP, inode, "TCPv6");
}
-static bool
-netlink_print(const int fd, const unsigned long inode)
+static const char *
+udp_v6_get(struct tcb *tcp, const int fd, const unsigned long inode)
+{
+ return inet_get(tcp, fd, AF_INET6, IPPROTO_UDP, inode, "UDPv6");
+}
+
+static const char *
+netlink_get(struct tcb *tcp, const int fd, const unsigned long inode)
{
- return netlink_send_query(fd, inode)
- && receive_responses(fd, inode, "NETLINK",
- netlink_parse_response);
+ return netlink_send_query(tcp, fd, inode)
+ && receive_responses(tcp, fd, inode, SOCK_DIAG_BY_FAMILY,
+ netlink_parse_response, (void *) "NETLINK")
+ ? get_sockaddr_by_inode_cached(inode) : NULL;
}
static const struct {
const char *const name;
- bool (*const print)(int, unsigned long);
+ const char * (*const get)(struct tcb *, int, unsigned long);
} protocols[] = {
- [SOCK_PROTO_UNIX] = { "UNIX", unix_print },
- [SOCK_PROTO_TCP] = { "TCP", tcp_v4_print },
- [SOCK_PROTO_UDP] = { "UDP", udp_v4_print },
- [SOCK_PROTO_TCPv6] = { "TCPv6", tcp_v6_print },
- [SOCK_PROTO_UDPv6] = { "UDPv6", udp_v6_print },
- [SOCK_PROTO_NETLINK] = { "NETLINK", netlink_print }
+ [SOCK_PROTO_UNIX] = { "UNIX", unix_get },
+ [SOCK_PROTO_TCP] = { "TCP", tcp_v4_get },
+ [SOCK_PROTO_UDP] = { "UDP", udp_v4_get },
+ [SOCK_PROTO_TCPv6] = { "TCPv6", tcp_v6_get },
+ [SOCK_PROTO_UDPv6] = { "UDPv6", udp_v6_get },
+ [SOCK_PROTO_NETLINK] = { "NETLINK", netlink_get }
};
enum sock_proto
return SOCK_PROTO_UNKNOWN;
}
-/* Given an inode number of a socket, print out the details
- * of the ip address and port. */
-
-bool
-print_sockaddr_by_inode(const unsigned long inode, const enum sock_proto proto)
+static const char *
+get_sockaddr_by_inode_uncached(struct tcb *tcp, const unsigned long inode,
+ const enum sock_proto proto)
{
if ((unsigned int) proto >= ARRAY_SIZE(protocols) ||
- (proto != SOCK_PROTO_UNKNOWN && !protocols[proto].print))
- return false;
+ (proto != SOCK_PROTO_UNKNOWN && !protocols[proto].get))
+ return NULL;
const int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG);
if (fd < 0)
- return false;
- bool r = false;
+ return NULL;
+ const char *details = NULL;
if (proto != SOCK_PROTO_UNKNOWN) {
- r = protocols[proto].print(fd, inode);
- if (!r) {
- tprintf("%s:[%lu]", protocols[proto].name, inode);
- r = true;
- }
+ details = protocols[proto].get(tcp, fd, inode);
} else {
unsigned int i;
for (i = (unsigned int) SOCK_PROTO_UNKNOWN + 1;
i < ARRAY_SIZE(protocols); ++i) {
- if (!protocols[i].print)
+ if (!protocols[i].get)
continue;
- r = protocols[i].print(fd, inode);
- if (r)
+ details = protocols[i].get(tcp, fd, inode);
+ if (details)
break;
}
}
close(fd);
- return r;
+ return details;
+}
+
+static bool
+print_sockaddr_by_inode_uncached(struct tcb *tcp, const unsigned long inode,
+ const enum sock_proto proto)
+{
+ const char *details = get_sockaddr_by_inode_uncached(tcp, inode, proto);
+
+ if (details) {
+ tprints(details);
+ return true;
+ }
+
+ if ((unsigned int) proto < ARRAY_SIZE(protocols) &&
+ protocols[proto].name) {
+ tprintf("%s:[%lu]", protocols[proto].name, inode);
+ return true;
+ }
+
+ return false;
+}
+
+/* Given an inode number of a socket, return its protocol details. */
+const char *
+get_sockaddr_by_inode(struct tcb *const tcp, const int fd,
+ const unsigned long inode)
+{
+ const char *details = get_sockaddr_by_inode_cached(inode);
+ return details ? details :
+ get_sockaddr_by_inode_uncached(tcp, inode, getfdproto(tcp, fd));
+}
+
+/* Given an inode number of a socket, print out its protocol details. */
+bool
+print_sockaddr_by_inode(struct tcb *const tcp, const int fd,
+ const unsigned long inode)
+{
+ return print_sockaddr_by_inode_cached(inode) ? true :
+ print_sockaddr_by_inode_uncached(tcp, inode,
+ getfdproto(tcp, fd));
+}
+
+#ifdef HAVE_LINUX_GENETLINK_H
+/*
+ * Managing the cache for decoding communications of Netlink GENERIC protocol
+ *
+ * As name shown Netlink GENERIC protocol is generic protocol. The
+ * numbers of msg types used in the protocol are not defined
+ * statically. Kernel defines them on demand. So the xlat converted
+ * from header files doesn't help for decoding the protocol. Following
+ * codes are building xlat(dyxlat) at runtime.
+ */
+static bool
+genl_send_dump_families(struct tcb *tcp, const int fd)
+{
+ struct {
+ const struct nlmsghdr nlh;
+ struct genlmsghdr gnlh;
+ } req = {
+ .nlh = {
+ .nlmsg_len = sizeof(req),
+ .nlmsg_type = GENL_ID_CTRL,
+ .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ },
+ .gnlh = {
+ .cmd = CTRL_CMD_GETFAMILY,
+ }
+ };
+ return send_query(tcp, fd, &req, sizeof(req));
}
+
+static int
+genl_parse_families_response(const void *const data,
+ const int data_len, const unsigned long inode,
+ void *opaque_data)
+{
+ struct dyxlat *const dyxlat = opaque_data;
+ const struct genlmsghdr *const gnlh = data;
+ struct rtattr *attr;
+ int rta_len = data_len - NLMSG_LENGTH(sizeof(*gnlh));
+
+ char *name = NULL;
+ unsigned int name_len = 0;
+ uint16_t *id = NULL;
+
+ if (rta_len < 0)
+ return -1;
+ if (gnlh->cmd != CTRL_CMD_NEWFAMILY)
+ return -1;
+ if (gnlh->version != 2)
+ return -1;
+
+ for (attr = (struct rtattr *) (gnlh + 1);
+ RTA_OK(attr, rta_len);
+ attr = RTA_NEXT(attr, rta_len)) {
+ switch (attr->rta_type) {
+ case CTRL_ATTR_FAMILY_NAME:
+ if (!name) {
+ name = RTA_DATA(attr);
+ name_len = RTA_PAYLOAD(attr);
+ }
+ break;
+ case CTRL_ATTR_FAMILY_ID:
+ if (!id && RTA_PAYLOAD(attr) == sizeof(*id))
+ id = RTA_DATA(attr);
+ break;
+ }
+
+ if (name && id) {
+ dyxlat_add_pair(dyxlat, *id, name, name_len);
+ name = NULL;
+ id = NULL;
+ }
+ }
+
+ return 0;
+}
+
+const struct xlat *
+genl_families_xlat(struct tcb *tcp)
+{
+ static struct dyxlat *dyxlat;
+
+ if (!dyxlat) {
+ dyxlat = dyxlat_alloc(32);
+
+ int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
+ if (fd < 0)
+ goto out;
+
+ if (genl_send_dump_families(tcp, fd))
+ receive_responses(tcp, fd, 0, GENL_ID_CTRL,
+ genl_parse_families_response, dyxlat);
+ close(fd);
+ }
+
+out:
+ return dyxlat_get(dyxlat);
+}
+
+#else /* !HAVE_LINUX_GENETLINK_H */
+
+const struct xlat *
+genl_families_xlat(struct tcb *tcp)
+{
+ return NULL;
+}
+#endif
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