2 * Copyright (c) 2014 Zubin Mithra <zubin.mithra@gmail.com>
3 * Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include <netinet/in.h>
31 #include <sys/socket.h>
32 #include <arpa/inet.h>
33 #include <linux/netlink.h>
34 #include <linux/sock_diag.h>
35 #include <linux/inet_diag.h>
36 #include <linux/unix_diag.h>
37 #include <linux/netlink_diag.h>
38 #include <linux/rtnetlink.h>
42 # define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) 0)->sun_path)
45 #ifndef NETLINK_SOCK_DIAG
46 # define NETLINK_SOCK_DIAG 4
54 #define CACHE_SIZE 1024U
55 static cache_entry cache[CACHE_SIZE];
56 #define CACHE_MASK (CACHE_SIZE - 1)
59 cache_and_print_inode_details(const unsigned long inode, char *const details)
61 cache_entry *e = &cache[inode & CACHE_MASK];
71 print_sockaddr_by_inode_cached(const unsigned long inode)
73 const cache_entry *const e = &cache[inode & CACHE_MASK];
74 if (e && inode == e->inode) {
82 send_query(const int fd, void *req, size_t req_size)
84 struct sockaddr_nl nladdr = {
85 .nl_family = AF_NETLINK
91 const struct msghdr msg = {
93 .msg_namelen = sizeof(nladdr),
99 if (sendmsg(fd, &msg, 0) < 0) {
109 inet_send_query(const int fd, const int family, const int proto)
112 const struct nlmsghdr nlh;
113 const struct inet_diag_req_v2 idr;
116 .nlmsg_len = sizeof(req),
117 .nlmsg_type = SOCK_DIAG_BY_FAMILY,
118 .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
121 .sdiag_family = family,
122 .sdiag_protocol = proto,
126 return send_query(fd, &req, sizeof(req));
130 inet_parse_response(const char *const proto_name, const void *const data,
131 const int data_len, const unsigned long inode)
133 const struct inet_diag_msg *const diag_msg = data;
134 static const char zero_addr[sizeof(struct in6_addr)];
135 socklen_t addr_size, text_size;
137 if (data_len < (int) NLMSG_LENGTH(sizeof(*diag_msg)))
139 if (diag_msg->idiag_inode != inode)
142 switch(diag_msg->idiag_family) {
144 addr_size = sizeof(struct in_addr);
145 text_size = INET_ADDRSTRLEN;
148 addr_size = sizeof(struct in6_addr);
149 text_size = INET6_ADDRSTRLEN;
155 char src_buf[text_size];
158 if (!inet_ntop(diag_msg->idiag_family, diag_msg->id.idiag_src,
162 if (diag_msg->id.idiag_dport ||
163 memcmp(zero_addr, diag_msg->id.idiag_dst, addr_size)) {
164 char dst_buf[text_size];
166 if (!inet_ntop(diag_msg->idiag_family, diag_msg->id.idiag_dst,
170 if (asprintf(&details, "%s:[%s:%u->%s:%u]", proto_name,
171 src_buf, ntohs(diag_msg->id.idiag_sport),
172 dst_buf, ntohs(diag_msg->id.idiag_dport)) < 0)
175 if (asprintf(&details, "%s:[%s:%u]", proto_name, src_buf,
176 ntohs(diag_msg->id.idiag_sport)) < 0)
180 return cache_and_print_inode_details(inode, details);
184 receive_responses(const int fd, const unsigned long inode,
185 const char *proto_name,
186 int (* parser) (const char *, const void *,
191 long buf[8192 / sizeof(long)];
194 struct sockaddr_nl nladdr = {
195 .nl_family = AF_NETLINK
198 .iov_base = hdr_buf.buf,
199 .iov_len = sizeof(hdr_buf.buf)
204 struct msghdr msg = {
206 .msg_namelen = sizeof(nladdr),
211 ssize_t ret = recvmsg(fd, &msg, flags);
218 const struct nlmsghdr *h = &hdr_buf.hdr;
219 if (!NLMSG_OK(h, ret))
221 for (; NLMSG_OK(h, ret); h = NLMSG_NEXT(h, ret)) {
222 if (h->nlmsg_type != SOCK_DIAG_BY_FAMILY)
224 const int rc = parser(proto_name, NLMSG_DATA(h),
225 h->nlmsg_len, inode);
231 flags = MSG_DONTWAIT;
236 inet_print(const int fd, const int family, const int protocol,
237 const unsigned long inode, const char *proto_name)
239 return inet_send_query(fd, family, protocol)
240 && receive_responses(fd, inode, proto_name, inet_parse_response);
244 unix_send_query(const int fd, const unsigned long inode)
247 const struct nlmsghdr nlh;
248 const struct unix_diag_req udr;
251 .nlmsg_len = sizeof(req),
252 .nlmsg_type = SOCK_DIAG_BY_FAMILY,
253 .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
256 .sdiag_family = AF_UNIX,
259 .udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_PEER
262 return send_query(fd, &req, sizeof(req));
266 unix_parse_response(const char *proto_name, const void *data,
267 const int data_len, const unsigned long inode)
269 const struct unix_diag_msg *diag_msg = data;
271 int rta_len = data_len - NLMSG_LENGTH(sizeof(*diag_msg));
274 char path[UNIX_PATH_MAX + 1];
278 if (diag_msg->udiag_ino != inode)
280 if (diag_msg->udiag_family != AF_UNIX)
283 for (attr = (struct rtattr *) (diag_msg + 1);
284 RTA_OK(attr, rta_len);
285 attr = RTA_NEXT(attr, rta_len)) {
286 switch (attr->rta_type) {
289 path_len = RTA_PAYLOAD(attr);
290 if (path_len > UNIX_PATH_MAX)
291 path_len = UNIX_PATH_MAX;
292 memcpy(path, RTA_DATA(attr), path_len);
293 path[path_len] = '\0';
297 if (RTA_PAYLOAD(attr) >= 4)
298 peer = *(uint32_t *) RTA_DATA(attr);
304 * print obtained information in the following format:
305 * "UNIX:[" SELF_INODE [ "->" PEER_INODE ][ "," SOCKET_FILE ] "]"
307 if (!peer && !path_len)
310 char peer_str[3 + sizeof(peer) * 3];
312 snprintf(peer_str, sizeof(peer_str), "->%u", peer);
316 const char *path_str;
318 char *outstr = alloca(4 * path_len + 4);
321 if (path[0] == '\0') {
323 string_quote(path + 1, outstr + 2,
324 path_len - 1, QUOTE_0_TERMINATED);
326 string_quote(path, outstr + 1,
327 path_len, QUOTE_0_TERMINATED);
335 if (asprintf(&details, "%s:[%lu%s%s]", proto_name, inode,
336 peer_str, path_str) < 0)
339 return cache_and_print_inode_details(inode, details);
343 netlink_send_query(const int fd, const unsigned long inode)
346 const struct nlmsghdr nlh;
347 const struct netlink_diag_req ndr;
350 .nlmsg_len = sizeof(req),
351 .nlmsg_type = SOCK_DIAG_BY_FAMILY,
352 .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
355 .sdiag_family = AF_NETLINK,
356 .sdiag_protocol = NDIAG_PROTO_ALL,
357 .ndiag_show = NDIAG_SHOW_MEMINFO
360 return send_query(fd, &req, sizeof(req));
364 netlink_parse_response(const char *proto_name, const void *data,
365 const int data_len, const unsigned long inode)
367 const struct netlink_diag_msg *const diag_msg = data;
368 const char *netlink_proto;
371 if (data_len < (int) NLMSG_LENGTH(sizeof(*diag_msg)))
373 if (diag_msg->ndiag_ino != inode)
376 if (diag_msg->ndiag_family != AF_NETLINK)
379 netlink_proto = xlookup(netlink_protocols,
380 diag_msg->ndiag_protocol);
383 static const char netlink_prefix[] = "NETLINK_";
384 const size_t netlink_prefix_len =
385 sizeof(netlink_prefix) -1;
386 if (strncmp(netlink_proto, netlink_prefix,
387 netlink_prefix_len) == 0)
388 netlink_proto += netlink_prefix_len;
389 if (asprintf(&details, "%s:[%s:%u]", proto_name,
390 netlink_proto, diag_msg->ndiag_portid) < 0)
393 if (asprintf(&details, "%s:[%u]", proto_name,
394 (unsigned) diag_msg->ndiag_protocol) < 0)
398 return cache_and_print_inode_details(inode, details);
402 unix_print(const int fd, const unsigned long inode)
404 return unix_send_query(fd, inode)
405 && receive_responses(fd, inode, "UNIX", unix_parse_response);
409 tcp_v4_print(const int fd, const unsigned long inode)
411 return inet_print(fd, AF_INET, IPPROTO_TCP, inode, "TCP");
415 udp_v4_print(const int fd, const unsigned long inode)
417 return inet_print(fd, AF_INET, IPPROTO_UDP, inode, "UDP");
421 tcp_v6_print(const int fd, const unsigned long inode)
423 return inet_print(fd, AF_INET6, IPPROTO_TCP, inode, "TCPv6");
427 udp_v6_print(const int fd, const unsigned long inode)
429 return inet_print(fd, AF_INET6, IPPROTO_UDP, inode, "UDPv6");
433 netlink_print(const int fd, const unsigned long inode)
435 return netlink_send_query(fd, inode)
436 && receive_responses(fd, inode, "NETLINK",
437 netlink_parse_response);
440 static const struct {
441 const char *const name;
442 bool (*const print)(int, unsigned long);
444 [SOCK_PROTO_UNIX] = { "UNIX", unix_print },
445 [SOCK_PROTO_TCP] = { "TCP", tcp_v4_print },
446 [SOCK_PROTO_UDP] = { "UDP", udp_v4_print },
447 [SOCK_PROTO_TCPv6] = { "TCPv6", tcp_v6_print },
448 [SOCK_PROTO_UDPv6] = { "UDPv6", udp_v6_print },
449 [SOCK_PROTO_NETLINK] = { "NETLINK", netlink_print }
453 get_proto_by_name(const char *const name)
456 for (i = (unsigned int) SOCK_PROTO_UNKNOWN + 1;
457 i < ARRAY_SIZE(protocols); ++i) {
458 if (protocols[i].name && !strcmp(name, protocols[i].name))
459 return (enum sock_proto) i;
461 return SOCK_PROTO_UNKNOWN;
464 /* Given an inode number of a socket, print out the details
465 * of the ip address and port. */
468 print_sockaddr_by_inode(const unsigned long inode, const enum sock_proto proto)
470 if ((unsigned int) proto >= ARRAY_SIZE(protocols) ||
471 (proto != SOCK_PROTO_UNKNOWN && !protocols[proto].print))
474 const int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG);
479 if (proto != SOCK_PROTO_UNKNOWN) {
480 r = protocols[proto].print(fd, inode);
482 tprintf("%s:[%lu]", protocols[proto].name, inode);
487 for (i = (unsigned int) SOCK_PROTO_UNKNOWN + 1;
488 i < ARRAY_SIZE(protocols); ++i) {
489 if (!protocols[i].print)
491 r = protocols[i].print(fd, inode);