netstat源码(从android源码中提取)

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我是靠谱客的博主孤独马里奥，最近开发中收集的这篇文章主要介绍netstat源码(从android源码中提取)，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

/*
* Copyright (c) 2008, The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
*
notice, this list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of Google, Inc. nor the names of its contributors
*
may be used to endorse or promote products derived from this
*
software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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
* COPYRIGHT OWNER OR CONTRIBUTORS 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 <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
typedef union iaddr iaddr;
typedef union iaddr6 iaddr6;
union iaddr {
unsigned u;
unsigned char b[4];
};
union iaddr6 {
struct {
unsigned a;
unsigned b;
unsigned c;
unsigned d;
} u;
unsigned char b[16];
};
//连接状态
static const char *state2str(unsigned state)
{
switch(state){
case 0x1: return "ESTABLISHED";
case 0x2: return "SYN_SENT";
case 0x3: return "SYN_RECV";
case 0x4: return "FIN_WAIT1";
case 0x5: return "FIN_WAIT2";
case 0x6: return "TIME_WAIT";
case 0x7: return "CLOSE";
case 0x8: return "CLOSE_WAIT";
case 0x9: return "LAST_ACK";
case 0xA: return "LISTEN";
case 0xB: return "CLOSING";
default: return "UNKNOWN";
}
}
/* addr + : + port +  */
#define ADDR_LEN INET6_ADDRSTRLEN + 1 + 5 + 1
//转换ip地址数据为字符串buf
static void addr2str(int af, const void *addr, unsigned port, char *buf)
{
if (inet_ntop(af, addr, buf, ADDR_LEN) == NULL) {
*buf = '';
return;
}
size_t len = strlen(buf);
if (port) {
snprintf(buf+len, ADDR_LEN-len, ":%d", port);
} else {
strncat(buf+len, ":*", ADDR_LEN-len-1);
}
}
static void ipv4(const char *filename, const char *label) {
//读取文件
FILE *fp = fopen(filename, "r");
if (fp == NULL) {
return;
}
char buf[BUFSIZ];
//第一次读取到buf
fgets(buf, BUFSIZ, fp);
while (fgets(buf, BUFSIZ, fp)){
char lip[ADDR_LEN];
char rip[ADDR_LEN];
iaddr laddr, raddr;
unsigned lport, rport, state, txq, rxq, num;
//读取buf数据到addr, raddr等;
int n = sscanf(buf, " %d: %x:%x %x:%x %x %x:%x",
&num, &laddr.u, &lport, &raddr.u, &rport,
&state, &txq, &rxq);
if (n == 8) {
addr2str(AF_INET, &laddr, lport, lip);
addr2str(AF_INET, &raddr, rport, rip);
printf("%4s
%6d %6d %-22s %-22s %sn",
label, txq, rxq, lip, rip,
state2str(state));
}
}
fclose(fp);
}
static void ipv6(const char *filename, const char *label) {
FILE *fp = fopen(filename, "r");
if (fp == NULL) {
return;
}
char buf[BUFSIZ];
fgets(buf, BUFSIZ, fp);
while (fgets(buf, BUFSIZ, fp)){
char lip[ADDR_LEN];
char rip[ADDR_LEN];
iaddr6 laddr6, raddr6;
unsigned lport, rport, state, txq, rxq, num;
int n = sscanf(buf, " %d: %8x%8x%8x%8x:%x %8x%8x%8x%8x:%x %x %x:%x",
&num, &laddr6.u.a, &laddr6.u.b, &laddr6.u.c, &laddr6.u.d, &lport,
&raddr6.u.a, &raddr6.u.b, &raddr6.u.c, &raddr6.u.d, &rport,
&state, &txq, &rxq);
if (n == 14) {
addr2str(AF_INET6, &laddr6, lport, lip);
addr2str(AF_INET6, &raddr6, rport, rip);
printf("%4s
%6d %6d %-22s %-22s %sn",
label, txq, rxq, lip, rip,
state2str(state));
}
}
fclose(fp);
}
//从android源码中提取的netstat的源码,可以使用qt creator在linux下编译，或者使用gcc -o netstat.exe netstat.c 编译
int main(int argc, char *argv[])
{
printf("Proto Recv-Q Send-Q Local Address
Foreign Address
Staten");
ipv4("/proc/net/tcp",
"tcp");
ipv4("/proc/net/udp",
"udp");
ipv6("/proc/net/tcp6", "tcp6");
ipv6("/proc/net/udp6", "udp6");
return 0;
}