1 /*
2 * Copyright (c) 2008, The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google, Inc. nor the names of its contributors
15 * may be used to endorse or promote products derived from this
16 * software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
25 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <arpa/inet.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <sys/socket.h>
36 #include <sys/types.h>
37
38 typedef union iaddr iaddr;
39 typedef union iaddr6 iaddr6;
40
41 union iaddr {
42 unsigned u;
43 unsigned char b[4];
44 };
45
46 union iaddr6 {
47 struct {
48 unsigned a;
49 unsigned b;
50 unsigned c;
51 unsigned d;
52 } u;
53 unsigned char b[16];
54 };
55
state2str(unsigned state)56 static const char *state2str(unsigned state)
57 {
58 switch(state){
59 case 0x1: return "ESTABLISHED";
60 case 0x2: return "SYN_SENT";
61 case 0x3: return "SYN_RECV";
62 case 0x4: return "FIN_WAIT1";
63 case 0x5: return "FIN_WAIT2";
64 case 0x6: return "TIME_WAIT";
65 case 0x7: return "CLOSE";
66 case 0x8: return "CLOSE_WAIT";
67 case 0x9: return "LAST_ACK";
68 case 0xA: return "LISTEN";
69 case 0xB: return "CLOSING";
70 default: return "UNKNOWN";
71 }
72 }
73
74 /* addr + : + port + \0 */
75 #define ADDR_LEN INET6_ADDRSTRLEN + 1 + 5 + 1
76
addr2str(int af,const void * addr,unsigned port,char * buf)77 static void addr2str(int af, const void *addr, unsigned port, char *buf)
78 {
79 if (inet_ntop(af, addr, buf, ADDR_LEN) == NULL) {
80 *buf = '\0';
81 return;
82 }
83 size_t len = strlen(buf);
84 if (port) {
85 snprintf(buf+len, ADDR_LEN-len, ":%d", port);
86 } else {
87 strncat(buf+len, ":*", ADDR_LEN-len-1);
88 }
89 }
90
ipv4(const char * filename,const char * label)91 static void ipv4(const char *filename, const char *label) {
92 FILE *fp = fopen(filename, "r");
93 if (fp == NULL) {
94 return;
95 }
96 char buf[BUFSIZ];
97 fgets(buf, BUFSIZ, fp);
98 while (fgets(buf, BUFSIZ, fp)){
99 char lip[ADDR_LEN];
100 char rip[ADDR_LEN];
101 iaddr laddr, raddr;
102 unsigned lport, rport, state, txq, rxq, num;
103 int n = sscanf(buf, " %d: %x:%x %x:%x %x %x:%x",
104 &num, &laddr.u, &lport, &raddr.u, &rport,
105 &state, &txq, &rxq);
106 if (n == 8) {
107 addr2str(AF_INET, &laddr, lport, lip);
108 addr2str(AF_INET, &raddr, rport, rip);
109
110 printf("%4s %6d %6d %-22s %-22s %s\n",
111 label, rxq, txq, lip, rip,
112 state2str(state));
113 }
114 }
115 fclose(fp);
116 }
117
ipv6(const char * filename,const char * label)118 static void ipv6(const char *filename, const char *label) {
119 FILE *fp = fopen(filename, "r");
120 if (fp == NULL) {
121 return;
122 }
123 char buf[BUFSIZ];
124 fgets(buf, BUFSIZ, fp);
125 while (fgets(buf, BUFSIZ, fp)){
126 char lip[ADDR_LEN];
127 char rip[ADDR_LEN];
128 iaddr6 laddr6, raddr6;
129 unsigned lport, rport, state, txq, rxq, num;
130 int n = sscanf(buf, " %d: %8x%8x%8x%8x:%x %8x%8x%8x%8x:%x %x %x:%x",
131 &num, &laddr6.u.a, &laddr6.u.b, &laddr6.u.c, &laddr6.u.d, &lport,
132 &raddr6.u.a, &raddr6.u.b, &raddr6.u.c, &raddr6.u.d, &rport,
133 &state, &txq, &rxq);
134 if (n == 14) {
135 addr2str(AF_INET6, &laddr6, lport, lip);
136 addr2str(AF_INET6, &raddr6, rport, rip);
137
138 printf("%4s %6d %6d %-22s %-22s %s\n",
139 label, rxq, txq, lip, rip,
140 state2str(state));
141 }
142 }
143 fclose(fp);
144 }
145
netstat_main(int argc,char * argv[])146 int netstat_main(int argc, char *argv[])
147 {
148 printf("Proto Recv-Q Send-Q Local Address Foreign Address State\n");
149 ipv4("/proc/net/tcp", "tcp");
150 ipv4("/proc/net/udp", "udp");
151 ipv6("/proc/net/tcp6", "tcp6");
152 ipv6("/proc/net/udp6", "udp6");
153 return 0;
154 }
155