+/*
+ * Copyright (c) 2014 Zubin Mithra <zubin.mithra@gmail.com>
+ * Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
#include "defs.h"
#include <netinet/in.h>
#include <sys/socket.h>
#include <linux/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
+#endif
+
+#include <sys/un.h>
+#ifndef UNIX_PATH_MAX
+# define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) 0)->sun_path)
+#endif
+
+typedef struct {
+ unsigned long inode;
+ char *details;
+} cache_entry;
+
+#define CACHE_SIZE 1024U
+static cache_entry cache[CACHE_SIZE];
+#define CACHE_MASK (CACHE_SIZE - 1)
+
+static int
+cache_and_print_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)
+{
+ const cache_entry *const e = &cache[inode & CACHE_MASK];
+ if (e && inode == e->inode) {
+ tprints(e->details);
+ return true;
+ }
+ return false;
+}
static bool
-send_query(const int fd, const int family, const int proto)
+send_query(const int fd, void *req, size_t req_size)
{
- struct sockaddr_nl nladdr;
- struct {
- struct nlmsghdr nlh;
- struct inet_diag_req_v2 idr;
- } req;
+ struct sockaddr_nl nladdr = {
+ .nl_family = AF_NETLINK
+ };
struct iovec iov = {
- .iov_base = &req,
- .iov_len = sizeof(req)
+ .iov_base = req,
+ .iov_len = req_size
};
- struct msghdr msg = {
- .msg_name = (void*)&nladdr,
+ const struct msghdr msg = {
+ .msg_name = &nladdr,
.msg_namelen = sizeof(nladdr),
.msg_iov = &iov,
.msg_iovlen = 1
};
- memset(&nladdr, 0, sizeof(nladdr));
- nladdr.nl_family = AF_NETLINK;
-
- memset(&req, 0, sizeof(req));
- req.nlh.nlmsg_len = sizeof(req);
- req.nlh.nlmsg_type = SOCK_DIAG_BY_FAMILY;
- req.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST;
- req.idr.sdiag_family = family;
- req.idr.sdiag_protocol = proto;
- req.idr.idiag_states = -1;
-
for (;;) {
if (sendmsg(fd, &msg, 0) < 0) {
if (errno == EINTR)
}
static bool
-parse_response(const struct inet_diag_msg *diag_msg, const unsigned long inode)
+inet_send_query(const int fd, const int family, const int proto)
+{
+ struct {
+ const struct nlmsghdr nlh;
+ const struct inet_diag_req_v2 idr;
+ } req = {
+ .nlh = {
+ .nlmsg_len = sizeof(req),
+ .nlmsg_type = SOCK_DIAG_BY_FAMILY,
+ .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
+ },
+ .idr = {
+ .sdiag_family = family,
+ .sdiag_protocol = proto,
+ .idiag_states = -1
+ }
+ };
+ return send_query(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)
{
+ 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 (data_len < (int) NLMSG_LENGTH(sizeof(*diag_msg)))
+ return -1;
if (diag_msg->idiag_inode != inode)
- return false;
+ return 0;
switch(diag_msg->idiag_family) {
case AF_INET:
text_size = INET6_ADDRSTRLEN;
break;
default:
- return false;
+ return -1;
}
char src_buf[text_size];
+ char *details;
if (!inet_ntop(diag_msg->idiag_family, diag_msg->id.idiag_src,
src_buf, text_size))
- return false;
+ return -1;
if (diag_msg->id.idiag_dport ||
memcmp(zero_addr, diag_msg->id.idiag_dst, addr_size)) {
if (!inet_ntop(diag_msg->idiag_family, diag_msg->id.idiag_dst,
dst_buf, text_size))
- return false;
+ return -1;
- tprintf("%s:%u->%s:%u",
- src_buf, ntohs(diag_msg->id.idiag_sport),
- dst_buf, ntohs(diag_msg->id.idiag_dport));
+ 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)
+ return false;
} else {
- tprintf("%s:%u", src_buf, ntohs(diag_msg->id.idiag_sport));
+ if (asprintf(&details, "%s:[%s:%u]", proto_name, src_buf,
+ ntohs(diag_msg->id.idiag_sport)) < 0)
+ return false;
}
- return true;
+ return cache_and_print_inode_details(inode, details);
}
static bool
-receive_responses(const int fd, const unsigned long inode)
+receive_responses(const int fd, const unsigned long inode,
+ const char *proto_name,
+ int (* parser) (const char *, const void *,
+ int, unsigned long))
{
- static char buf[8192];
- struct sockaddr_nl nladdr;
+ static union {
+ struct nlmsghdr hdr;
+ long buf[8192 / sizeof(long)];
+ } hdr_buf;
+
+ struct sockaddr_nl nladdr = {
+ .nl_family = AF_NETLINK
+ };
struct iovec iov = {
- .iov_base = buf,
- .iov_len = sizeof(buf)
+ .iov_base = hdr_buf.buf,
+ .iov_len = sizeof(hdr_buf.buf)
};
-
- memset(&nladdr, 0, sizeof(nladdr));
- nladdr.nl_family = AF_NETLINK;
+ int flags = 0;
for (;;) {
- ssize_t ret;
- struct nlmsghdr *h;
struct msghdr msg = {
- .msg_name = (void*)&nladdr,
+ .msg_name = &nladdr,
.msg_namelen = sizeof(nladdr),
.msg_iov = &iov,
- .msg_iovlen = 1,
- .msg_control = NULL,
- .msg_controllen = 0,
- .msg_flags = 0
+ .msg_iovlen = 1
};
- ret = recvmsg(fd, &msg, 0);
+ ssize_t ret = recvmsg(fd, &msg, flags);
if (ret < 0) {
if (errno == EINTR)
continue;
return false;
}
- if (!ret)
+
+ const struct nlmsghdr *h = &hdr_buf.hdr;
+ if (!NLMSG_OK(h, ret))
return false;
- for (h = (struct nlmsghdr*)buf;
- NLMSG_OK(h, ret);
- h = NLMSG_NEXT(h, ret)) {
- switch (h->nlmsg_type) {
- case NLMSG_DONE:
- case NLMSG_ERROR:
- return false;
- }
- if (parse_response(NLMSG_DATA(h), inode))
+ for (; NLMSG_OK(h, ret); h = NLMSG_NEXT(h, ret)) {
+ if (h->nlmsg_type != SOCK_DIAG_BY_FAMILY)
+ return false;
+ const int rc = parser(proto_name, NLMSG_DATA(h),
+ h->nlmsg_len, inode);
+ if (rc > 0)
return true;
+ if (rc < 0)
+ return false;
+ }
+ flags = MSG_DONTWAIT;
+ }
+}
+
+static bool
+inet_print(const int fd, const int family, const int protocol,
+ const unsigned long inode, const char *proto_name)
+{
+ return inet_send_query(fd, family, protocol)
+ && receive_responses(fd, inode, proto_name, inet_parse_response);
+}
+
+static bool
+unix_send_query(const int fd, const unsigned long inode)
+{
+ struct {
+ const struct nlmsghdr nlh;
+ const struct unix_diag_req udr;
+ } req = {
+ .nlh = {
+ .nlmsg_len = sizeof(req),
+ .nlmsg_type = SOCK_DIAG_BY_FAMILY,
+ .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
+ },
+ .udr = {
+ .sdiag_family = AF_UNIX,
+ .udiag_ino = inode,
+ .udiag_states = -1,
+ .udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_PEER
+ }
+ };
+ return send_query(fd, &req, sizeof(req));
+}
+
+static int
+unix_parse_response(const char *proto_name, const void *data,
+ const int data_len, const unsigned long inode)
+{
+ const struct unix_diag_msg *diag_msg = data;
+ struct rtattr *attr;
+ int rta_len = data_len - NLMSG_LENGTH(sizeof(*diag_msg));
+ uint32_t peer = 0;
+ size_t path_len = 0;
+ char path[UNIX_PATH_MAX + 1];
+
+ if (rta_len < 0)
+ return -1;
+ if (diag_msg->udiag_ino != inode)
+ return 0;
+ if (diag_msg->udiag_family != AF_UNIX)
+ return -1;
+
+ for (attr = (struct rtattr *) (diag_msg + 1);
+ RTA_OK(attr, rta_len);
+ attr = RTA_NEXT(attr, rta_len)) {
+ switch (attr->rta_type) {
+ case UNIX_DIAG_NAME:
+ if (!path_len) {
+ path_len = RTA_PAYLOAD(attr);
+ if (path_len > UNIX_PATH_MAX)
+ path_len = UNIX_PATH_MAX;
+ memcpy(path, RTA_DATA(attr), path_len);
+ path[path_len] = '\0';
+ }
+ break;
+ case UNIX_DIAG_PEER:
+ if (RTA_PAYLOAD(attr) >= 4)
+ peer = *(uint32_t *) RTA_DATA(attr);
+ break;
}
}
+
+ /*
+ * print obtained information in the following format:
+ * "UNIX:[" SELF_INODE [ "->" PEER_INODE ][ "," SOCKET_FILE ] "]"
+ */
+ if (!peer && !path_len)
+ return -1;
+
+ char peer_str[3 + sizeof(peer) * 3];
+ if (peer)
+ snprintf(peer_str, sizeof(peer_str), "->%u", peer);
+ else
+ peer_str[0] = '\0';
+
+ const char *path_str;
+ if (path_len) {
+ char *outstr = alloca(4 * path_len + 4);
+
+ outstr[0] = ',';
+ if (path[0] == '\0') {
+ outstr[1] = '@';
+ string_quote(path + 1, outstr + 2,
+ path_len - 1, QUOTE_0_TERMINATED);
+ } else {
+ string_quote(path, outstr + 1,
+ path_len, QUOTE_0_TERMINATED);
+ }
+ path_str = outstr;
+ } else {
+ path_str = "";
+ }
+
+ char *details;
+ if (asprintf(&details, "%s:[%lu%s%s]", proto_name, inode,
+ peer_str, path_str) < 0)
+ return -1;
+
+ return cache_and_print_inode_details(inode, details);
+}
+
+static bool
+netlink_send_query(const int fd, const unsigned long inode)
+{
+ struct {
+ const struct nlmsghdr nlh;
+ const struct netlink_diag_req ndr;
+ } req = {
+ .nlh = {
+ .nlmsg_len = sizeof(req),
+ .nlmsg_type = SOCK_DIAG_BY_FAMILY,
+ .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
+ },
+ .ndr = {
+ .sdiag_family = AF_NETLINK,
+ .sdiag_protocol = NDIAG_PROTO_ALL,
+ .ndiag_show = NDIAG_SHOW_MEMINFO
+ }
+ };
+ return send_query(fd, &req, sizeof(req));
+}
+
+static int
+netlink_parse_response(const char *proto_name, const void *data,
+ const int data_len, const unsigned long inode)
+{
+ const struct netlink_diag_msg *const diag_msg = data;
+ const char *netlink_proto;
+ char *details;
+
+ if (data_len < (int) NLMSG_LENGTH(sizeof(*diag_msg)))
+ return -1;
+ if (diag_msg->ndiag_ino != inode)
+ return 0;
+
+ if (diag_msg->ndiag_family != AF_NETLINK)
+ return -1;
+
+ netlink_proto = xlookup(netlink_protocols,
+ 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;
+ if (asprintf(&details, "%s:[%s:%u]", proto_name,
+ netlink_proto, diag_msg->ndiag_portid) < 0)
+ return -1;
+ } else {
+ if (asprintf(&details, "%s:[%u]", proto_name,
+ (unsigned) diag_msg->ndiag_protocol) < 0)
+ return -1;
+ }
+
+ return cache_and_print_inode_details(inode, details);
+}
+
+static bool
+unix_print(const int fd, const unsigned long inode)
+{
+ return unix_send_query(fd, inode)
+ && receive_responses(fd, inode, "UNIX", unix_parse_response);
+}
+
+static bool
+tcp_v4_print(const int fd, const unsigned long inode)
+{
+ return inet_print(fd, AF_INET, IPPROTO_TCP, inode, "TCP");
+}
+
+static bool
+udp_v4_print(const int fd, const unsigned long inode)
+{
+ return inet_print(fd, AF_INET, IPPROTO_UDP, inode, "UDP");
+}
+
+static bool
+tcp_v6_print(const int fd, const unsigned long inode)
+{
+ return inet_print(fd, AF_INET6, IPPROTO_TCP, inode, "TCPv6");
+}
+
+static bool
+udp_v6_print(const int fd, const unsigned long inode)
+{
+ return inet_print(fd, AF_INET6, IPPROTO_UDP, inode, "UDPv6");
+}
+
+static bool
+netlink_print(const int fd, const unsigned long inode)
+{
+ return netlink_send_query(fd, inode)
+ && receive_responses(fd, inode, "NETLINK",
+ netlink_parse_response);
}
/* 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)
+print_sockaddr_by_inode(const unsigned long inode, const char *const proto_name)
{
- const int families[] = {AF_INET, AF_INET6};
- const int protocols[] = {IPPROTO_TCP, IPPROTO_UDP};
- const size_t flen = ARRAY_SIZE(families);
- const size_t plen = ARRAY_SIZE(protocols);
- size_t fi, pi;
- int fd;
+ static const struct {
+ const char *const name;
+ bool (*const print)(int, unsigned long);
+ } protocols[] = {
+ { "TCP", tcp_v4_print },
+ { "UDP", udp_v4_print },
+ { "TCPv6", tcp_v6_print },
+ { "UDPv6", udp_v6_print },
+ { "UNIX", unix_print },
+ { "NETLINK", netlink_print }
+ };
- fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG);
+ const int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG);
if (fd < 0)
return false;
+ bool r = false;
+ unsigned int i;
- for (fi = 0; fi < flen; ++fi) {
- for (pi = 0; pi < plen; ++pi) {
- if (!send_query(fd, families[fi], protocols[pi]))
- continue;
- if (receive_responses(fd, inode)) {
- close(fd);
- return true;
+ if (proto_name) {
+ for (i = 0; i < ARRAY_SIZE(protocols); ++i) {
+ if (strcmp(proto_name, protocols[i].name) == 0) {
+ r = protocols[i].print(fd, inode);
+ break;
}
}
+
+ if (!r) {
+ tprintf("%s:[%lu]", proto_name, inode);
+ r = true;
+ }
+ } else {
+ for (i = 0; i < ARRAY_SIZE(protocols); ++i) {
+ if ((r = protocols[i].print(fd, inode)))
+ break;
+ }
}
close(fd);
- return false;
+ return r;
}
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