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dnsmasq_log.c
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dnsmasq_log.c
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#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define __USE_XOPEN 1
#include <time.h>
#include <getopt.h>
#include <sys/stat.h>
#ifndef GIT_VER
#define GIT_VER "test"
#endif
void log_scan();
uint32_t ips[2048];
char skip[200];
extern char * optarg;
struct hostname {
uint32_t ip;
char name[21];
} hostnames[512];
void load_hostname(){
FILE * fp;
fp = fopen("/tmp/dhcp.leases","r");
if(!fp) return;
int rc;
uint16_t count = 0;
uint8_t ip[4];
while(!feof(fp)) {
rc = fscanf(fp,"%30s %30s %hhd.%hhd.%hhd.%hhd %20s %30s", skip, skip, &ip[0],&ip[1],&ip[2],&ip[3], hostnames[count].name, skip);
fgets(skip,sizeof(skip),fp);
if(rc != 8 || hostnames[count].name[0] == '*'){
continue;
}
hostnames[count].ip = (uint32_t) (ip[0] << 24) | (ip[1] << 16) | (ip[2] << 8) | ip[3];
count ++;
}
fclose(fp);
}
void load_ips() {
FILE *fp;
int rc;
uint8_t ip[4];
uint16_t count = 0;
memset(ips,0,sizeof(ips));
system("ip ru list |grep ^290 >/tmp/dnsmasq_rule.list");
fp=fopen("/tmp/dnsmasq_rule.list","r");
if(fp) {
while(!feof(fp)) {
/*
29010: from 191.168.12.4/24 to 120.121.121.0/24 lookup 107
*/
rc = fscanf(fp,"%10s %10s %20s %10s %hhd.%hhd.%hhd.%hhd", skip, skip, skip, skip, &ip[0],&ip[1],&ip[2],&ip[3]);
fgets(skip, sizeof(skip), fp);
if(rc != 8) continue;
ips[count] = (uint32_t) (ip[0] << 24) | (ip[1] << 16) | (ip[2] << 8) ;
count++;
}
fclose(fp);
remove("/tmp/dnsmasq_rule.list");
}
}
extern char * optarg;
int32_t l = 3600;
int main(int argc, char * argv[])
{
int opt = 0;
bool h = false;
while((opt = getopt(argc, argv, "l:L:hHvVd:")) != -1) {
switch(opt) {
case 'h':
case 'H': //帮助信息
h = true;
break;
case 'l':
case 'L': //要显示的最后秒数
l = atoi(optarg);
break;
case 'V':
case 'v':
printf("Version:%s\n",GIT_VER);
break;
}
}
if( h ) {
printf("\r\n"
"Usage:\r\n"
"logread -l 10000 -e dnsmasq -S 80000 [|grep 192.168.1.2] |%s -l 600 [-s 192.168.1.2] [-v] [-V]\r\n\r\n"
"tail -n 10000 |grep dnsmasq [|grep 192.168.1.2] |%s -l 600 [-s 192.168.1.2] [-v] [-V]\r\n\r\n"
" -l 要显示的时长秒数\r\n"
" -V display version\r\n\r\n",
argv[0],
argv[0]);
return 1;
}
load_hostname();
load_ips();
log_scan();
return 0;
}
void log_scan() {
char buf[300],proc[31],domain[100],to[100],domain0[100], cname[100];
int rc;
uint8_t sip[4];
char sipstr[30];
uint8_t dip[4];
uint32_t pid, cname_pid = 0;
uint32_t dip32;
uint16_t year;
char month[20];
struct tm tm, tm_now;
char *ipname;
ipname = sipstr;
time_t now_t=time(NULL);
localtime_r(&now_t, &tm_now);
int32_t t0 = ((tm_now.tm_mday * 24 + tm_now.tm_hour) * 60 + tm_now.tm_min) * 60 + tm_now.tm_sec; //mktime()偶尔会出错 不用mktime
int32_t t1;
while(1) {
/*
Sun Dec 26 15:29:33 2021 daemon.info dnsmasq[11997]:xxxx
Jan 15 04:01:51 route dnsmasq[1405]: 41330 192.168.3.3/56062 reply cloud.browser.360.cn is 112.64.200.152
*/
while(1) {
rc = scanf("%30s",skip);
if(rc <= 0) return;
if((skip[0] & skip[1] & skip[3] & skip[4] & skip[6] & skip[7] & 0xf0) == 0x30
&& skip[2] == ':'
&& skip[5] == ':'
&& ((skip[0] | skip[1] | skip[3] | skip[4] | skip[6] | skip[7] ) & 0xf0) == 0x30) {
sscanf(skip,"%02d:%02d:%02d",&tm.tm_hour, &tm.tm_min, &tm.tm_sec);
for(uint8_t i = 0; i < 5; i++) {
rc = scanf("%30s",skip);
if(rc <= 0) return;
skip[7] = 0;
if(strcmp(skip, "dnsmasq") == 0) {
break;
}
}
if(strcmp(skip, "dnsmasq") == 0) {
break; //找到时间字段
}
} else if((strlen(skip) == 2) && (skip[0] <= '9') && (skip[0] >= '0') && (skip[1] <= '9') && (skip[1] >= '0')) {
sscanf(skip,"%d",&tm.tm_mday);
}
if(strcmp(skip, "dnsmasq") == 0) {
break; //找到时间字段
}
}
if(tm.tm_mday > tm_now.tm_mday)
tm.tm_mday -= 30;
t1 = ((tm.tm_mday * 24 + tm.tm_hour) * 60 + tm.tm_min) * 60 + tm.tm_sec; //mktime()偶尔会出错 不用mktime
if(t0 > t1 + l) {
continue; //长于10分钟之前的访问， 就跳过
}
/*
dnsmasq[12670]: 177526 192.168.12.13/36330 query[A] www.google.com from 192.168.12.13
dnsmasq[12670]: 177526 192.168.12.13/36330 forwarded www.google.com to 8.8.4.4
dnsmasq[12670]: 177526 192.168.12.13/36330 reply www.google.com is 142.250.81.228
dnsmasq[12670]: 177527 192.168.12.13/40934 query[AAAA] www.google.com from 192.168.12.13
dnsmasq[12670]: 177527 192.168.12.13/40934 forwarded www.google.com to 8.8.4.4
dnsmasq[14028]: 380 192.168.12.4/37307 reply yt3.ggpht.com is <CNAME>
dnsmasq[14028]: 380 192.168.12.4/37307 reply photos-ugc.l.googleusercontent.com is 142.251.43.1
*/
rc = scanf("%d %hhd.%hhd.%hhd.%hhd/%s %30s %99s %99s %30s",
&pid, &sip[0], &sip[1], &sip[2], &sip[3], skip, proc, domain, to, skip);
fgets(buf, sizeof(buf), stdin); //清理剩余部分
if(rc != 10) continue; //行不完整跳过
if(strcmp(skip,"<CNAME>")==0) {
cname_pid = pid;
strcpy(cname, domain);
continue;
}
if(sscanf(skip,"%hhd.%hhd.%hhd.%hhd", &dip[0], &dip[1], &dip[2], &dip[3]) != 4) continue;
if(sip[0] == 127) continue; //申请地址是本机127.0.0.1， 跳过
if(strcmp(to, "is") != 0) continue; //只显示 is 行
if(strcmp(domain, "localhost") == 0) continue; //要解析的域名是 localhost 跳过
if(cname_pid > 0 && cname_pid == pid) {
cname_pid = 0;
strcpy(domain, cname);
}
if(strcmp(domain, domain0) == 0) continue; //与上次域名不同
uint32_t sip32 = (uint32_t) (sip[0] << 24) | (sip[1] << 16) | (sip[2] << 8) | sip[3];
strncpy(domain0, domain, sizeof(domain));
snprintf(sipstr, sizeof(sipstr), "%d.%d.%d.%d", sip[0], sip[1] ,sip[2], sip[3]);
ipname = sipstr;
bool is_route = false;
for(uint16_t l = 1; l < 512; l++) //查dhcp.lease文件，替换ip为机器名
if(hostnames[l].ip == sip32) {
ipname = hostnames[l].name;
break;
}
dip32 = (uint32_t) (dip[0] << 24) | (dip[1] << 16) | (dip[2] << 8) ; //目标地址改成C网段
is_route = false;
for(uint16_t i = 0; i< 2048; i ++) { //检查是否在 已经转路由的ip列表里面，有的话， 就不显示
if(ips[i] == 0) break; //ips结束
if(ips[i] == dip32) {
is_route = true;
break;
}
}
if(is_route) continue; //已经在ips里的， 不要再显示
memset(skip, 0, sizeof(skip));
year = strlen(ipname);
if(year < 21) {
memset(skip, ' ', 21 - year);
}
printf("%02d:%02d:%02d %s%s \t%s\t%d.%d.%d.%d\n",
tm.tm_hour,
tm.tm_min,
tm.tm_sec,
skip,
ipname,
domain,
dip[0], dip[1], dip[2], dip[3]
);
}
}