/*
* 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 <arpa/inet.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"
#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, void *req, size_t req_size)
{
struct sockaddr_nl nladdr = {
.nl_family = AF_NETLINK
};
struct iovec iov = {
.iov_base = req,
.iov_len = req_size
};
const struct msghdr msg = {
.msg_name = &nladdr,
.msg_namelen = sizeof(nladdr),
.msg_iov = &iov,
.msg_iovlen = 1
};
for (;;) {
if (sendmsg(fd, &msg, 0) < 0) {
if (errno == EINTR)
continue;
return false;
}
return true;
}
}
static bool
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 0;
switch(diag_msg->idiag_family) {
case AF_INET:
addr_size = sizeof(struct in_addr);
text_size = INET_ADDRSTRLEN;
break;
case AF_INET6:
addr_size = sizeof(struct in6_addr);
text_size = INET6_ADDRSTRLEN;
break;
default:
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 -1;
if (diag_msg->id.idiag_dport ||
memcmp(zero_addr, diag_msg->id.idiag_dst, addr_size)) {
char dst_buf[text_size];
if (!inet_ntop(diag_msg->idiag_family, diag_msg->id.idiag_dst,
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)
return false;
} else {
if (asprintf(&details, "%s:[%s:%u]", proto_name, src_buf,
ntohs(diag_msg->id.idiag_sport)) < 0)
return false;
}
return cache_and_print_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))
{
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 = hdr_buf.buf,
.iov_len = sizeof(hdr_buf.buf)
};
int flags = 0;
for (;;) {
struct msghdr msg = {
.msg_name = &nladdr,
.msg_namelen = sizeof(nladdr),
.msg_iov = &iov,
.msg_iovlen = 1
};
ssize_t ret = recvmsg(fd, &msg, flags);
if (ret < 0) {
if (errno == EINTR)
continue;
return false;
}
const struct nlmsghdr *h = &hdr_buf.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)
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);
}
static const struct {
const char *const name;
bool (*const print)(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 }
};
enum sock_proto
get_proto_by_name(const char *const name)
{
unsigned int i;
for (i = (unsigned int) SOCK_PROTO_UNKNOWN + 1;
i < ARRAY_SIZE(protocols); ++i) {
if (protocols[i].name && !strcmp(name, protocols[i].name))
return (enum sock_proto) i;
}
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)
{
if ((unsigned int) proto >= ARRAY_SIZE(protocols) ||
(proto != SOCK_PROTO_UNKNOWN && !protocols[proto].print))
return false;
const int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG);
if (fd < 0)
return false;
bool r = false;
if (proto != SOCK_PROTO_UNKNOWN) {
r = protocols[proto].print(fd, inode);
if (!r) {
tprintf("%s:[%lu]", protocols[proto].name, inode);
r = true;
}
} else {
unsigned int i;
for (i = (unsigned int) SOCK_PROTO_UNKNOWN + 1;
i < ARRAY_SIZE(protocols); ++i) {
if (!protocols[i].print)
continue;
r = protocols[i].print(fd, inode);
if (r)
break;
}
}
close(fd);
return r;
}