netstat.c revision 2f7b72f9e8d06c80957cdf384d23d3bf5bd5ce5c 
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
38typedef union iaddr iaddr;
39typedef union iaddr6 iaddr6;
40
41union iaddr {
42    unsigned u;
43    unsigned char b[4];
44};
45
46union iaddr6 {
47    struct {
48        unsigned a;
49        unsigned b;
50        unsigned c;
51        unsigned d;
52    } u;
53    unsigned char b[16];
54};
55
56static 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
77static 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
91static 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, txq, rxq, lip, rip,
112                   state2str(state));
113        }
114    }
115    fclose(fp);
116}
117
118static 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, txq, rxq, lip, rip,
140                   state2str(state));
141        }
142    }
143    fclose(fp);
144}
145
146int 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