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wangyu-udp2raw/common.cpp

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/*
* comm.cpp
*
* Created on: Jul 29, 2017
* Author: wangyu
*/
#include "common.h"
#include "log.h"
int about_to_exit=0;
raw_mode_t raw_mode=mode_faketcp;
unordered_map<int, const char*> raw_mode_tostring = {{mode_faketcp, "faketcp"}, {mode_udp, "udp"}, {mode_icmp, "icmp"}};
int socket_buf_size=1024*1024;
static int random_number_fd=-1;
string iptables_pattern="";
int iptables_rule_added=0;
int iptables_rule_keeped=0;
int iptables_rule_keep_index=0;
//int iptables_rule_no_clear=0;
program_mode_t program_mode=unset_mode;//0 unset; 1client 2server
u64_t get_current_time()
{
timespec tmp_time;
clock_gettime(CLOCK_MONOTONIC, &tmp_time);
return tmp_time.tv_sec*1000+tmp_time.tv_nsec/(1000*1000l);
}
u64_t pack_u64(u32_t a,u32_t b)
{
u64_t ret=a;
ret<<=32u;
ret+=b;
return ret;
}
u32_t get_u64_h(u64_t a)
{
return a>>32u;
}
u32_t get_u64_l(u64_t a)
{
return (a<<32u)>>32u;
}
char * my_ntoa(u32_t ip)
{
in_addr a;
a.s_addr=ip;
return inet_ntoa(a);
}
/*
int add_iptables_rule(const char * s)
{
iptables_pattern=s;
string rule="iptables -I INPUT ";
rule+=iptables_pattern;
rule+=" -j DROP";
char *output;
if(run_command(rule.c_str(),output)==0)
{
mylog(log_warn,"auto added iptables rule by: %s\n",rule.c_str());
}
else
{
mylog(log_fatal,"auto added iptables failed by: %s\n",rule.c_str());
//mylog(log_fatal,"reason : %s\n",strerror(errno));
myexit(-1);
}
iptables_rule_added=1;
return 0;
}*/
string chain[2];
string rule_keep[2];
string rule_keep_add[2];
string rule_keep_del[2];
u64_t keep_rule_last_time=0;
pthread_t keep_thread;
int keep_thread_running=0;
int iptables_gen_add(const char * s,u32_t const_id)
{
string dummy="";
iptables_pattern=s;
chain[0] =dummy+ "udp2rawDwrW_C";
rule_keep[0]=dummy+ iptables_pattern+" -j " +chain[0];
rule_keep_add[0]=dummy+"iptables -I INPUT "+rule_keep[0];
char *output;
run_command(dummy+"iptables -N "+chain[0],output,show_none);
run_command(dummy+"iptables -F "+chain[0],output);
run_command(dummy+"iptables -I "+chain[0] + " -j DROP",output);
rule_keep_del[0]=dummy+"iptables -D INPUT "+rule_keep[0];
run_command(rule_keep_del[0],output,show_none);
run_command(rule_keep_del[0],output,show_none);
if(run_command(rule_keep_add[0],output)!=0)
{
mylog(log_fatal,"auto added iptables failed by: %s\n",rule_keep_add[0].c_str());
myexit(-1);
}
return 0;
}
int iptables_rule_init(const char * s,u32_t const_id,int keep)
{
iptables_pattern=s;
iptables_rule_added=1;
iptables_rule_keeped=keep;
string dummy="";
char const_id_str[100];
sprintf(const_id_str, "%x", const_id);
chain[0] =dummy+ "udp2rawDwrW_"+const_id_str+"_C0";
chain[1] =dummy+ "udp2rawDwrW_"+const_id_str+"_C1";
rule_keep[0]=dummy+ iptables_pattern+" -j " +chain[0];
rule_keep[1]=dummy+ iptables_pattern+" -j " +chain[1];
rule_keep_add[0]=dummy+"iptables -I INPUT "+rule_keep[0];
rule_keep_add[1]=dummy+"iptables -I INPUT "+rule_keep[1];
rule_keep_del[0]=dummy+"iptables -D INPUT "+rule_keep[0];
rule_keep_del[1]=dummy+"iptables -D INPUT "+rule_keep[1];
keep_rule_last_time=get_current_time();
char *output;
for(int i=0;i<=iptables_rule_keeped;i++)
{
run_command(dummy+"iptables -N "+chain[i],output);
run_command(dummy+"iptables -F "+chain[i],output);
run_command(dummy+"iptables -I "+chain[i] + " -j DROP",output);
if(run_command(rule_keep_add[i],output)!=0)
{
mylog(log_fatal,"auto added iptables failed by: %s\n",rule_keep_add[i].c_str());
myexit(-1);
}
}
mylog(log_warn,"auto added iptables rules\n");
return 0;
}
int keep_iptables_rule() //magic to work on a machine without grep/iptables --check/-m commment
{
/*
if(iptables_rule_keeped==0) return 0;
uint64_t tmp_current_time=get_current_time();
if(tmp_current_time-keep_rule_last_time<=iptables_rule_keep_interval)
{
return 0;
}
else
{
keep_rule_last_time=tmp_current_time;
}*/
mylog(log_debug,"keep_iptables_rule begin %llu\n",get_current_time());
iptables_rule_keep_index+=1;
iptables_rule_keep_index%=2;
string dummy="";
char *output;
int i=iptables_rule_keep_index;
run_command(dummy + "iptables -N " + chain[i], output,show_none);
if (run_command(dummy + "iptables -F " + chain[i], output,show_none) != 0)
mylog(log_warn, "iptables -F failed %d\n",i);
if (run_command(dummy + "iptables -I " + chain[i] + " -j DROP",output,show_none) != 0)
mylog(log_warn, "iptables -I failed %d\n",i);
if (run_command(rule_keep_del[i], output,show_none) != 0)
mylog(log_warn, "rule_keep_del failed %d\n",i);
run_command(rule_keep_del[i], output,show_none); //do it twice,incase it fails for unknown random reason
if(run_command(rule_keep_add[i], output,show_log)!=0)
mylog(log_warn, "rule_keep_del failed %d\n",i);
mylog(log_debug,"keep_iptables_rule end %llu\n",get_current_time());
return 0;
}
int clear_iptables_rule()
{
char *output;
string dummy="";
if(!iptables_rule_added) return 0;
for(int i=0;i<=iptables_rule_keeped;i++ )
{
run_command(rule_keep_del[i],output);
run_command(dummy+"iptables -F "+chain[i],output);
run_command(dummy+"iptables -X "+chain[i],output);
}
return 0;
}
void init_random_number_fd()
{
random_number_fd=open("/dev/urandom",O_RDONLY);
if(random_number_fd==-1)
{
mylog(log_fatal,"error open /dev/urandom\n");
myexit(-1);
}
setnonblocking(random_number_fd);
}
u64_t get_true_random_number_64()
{
u64_t ret;
int size=read(random_number_fd,&ret,sizeof(ret));
if(size!=sizeof(ret))
{
mylog(log_fatal,"get random number failed %d\n",size);
myexit(-1);
}
return ret;
}
u32_t get_true_random_number()
{
u32_t ret;
int size=read(random_number_fd,&ret,sizeof(ret));
if(size!=sizeof(ret))
{
mylog(log_fatal,"get random number failed %d\n",size);
myexit(-1);
}
return ret;
}
u32_t get_true_random_number_nz() //nz for non-zero
{
u32_t ret=0;
while(ret==0)
{
ret=get_true_random_number();
}
return ret;
}
u64_t ntoh64(u64_t a)
{
if(__BYTE_ORDER == __LITTLE_ENDIAN)
{
return bswap_64( a);
}
else return a;
}
u64_t hton64(u64_t a)
{
if(__BYTE_ORDER == __LITTLE_ENDIAN)
{
return bswap_64( a);
}
else return a;
}
void setnonblocking(int sock) {
int opts;
opts = fcntl(sock, F_GETFL);
if (opts < 0) {
mylog(log_fatal,"fcntl(sock,GETFL)\n");
//perror("fcntl(sock,GETFL)");
myexit(1);
}
opts = opts | O_NONBLOCK;
if (fcntl(sock, F_SETFL, opts) < 0) {
mylog(log_fatal,"fcntl(sock,SETFL,opts)\n");
//perror("fcntl(sock,SETFL,opts)");
myexit(1);
}
}
/*
Generic checksum calculation function
*/
unsigned short csum(const unsigned short *ptr,int nbytes) {
register long sum;
unsigned short oddbyte;
register short answer;
sum=0;
while(nbytes>1) {
sum+=*ptr++;
nbytes-=2;
}
if(nbytes==1) {
oddbyte=0;
*((u_char*)&oddbyte)=*(u_char*)ptr;
sum+=oddbyte;
}
sum = (sum>>16)+(sum & 0xffff);
sum = sum + (sum>>16);
answer=(short)~sum;
return(answer);
}
int set_buf_size(int fd)
{
if(setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
{
mylog(log_fatal,"SO_SNDBUFFORCE fail,fd %d\n",fd);
myexit(1);
}
if(setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
{
mylog(log_fatal,"SO_RCVBUFFORCE fail,fd %d\n",fd);
myexit(1);
}
return 0;
}
void myexit(int a)
{
if(enable_log_color)
printf("%s\n",RESET);
if(keep_thread_running)
{
if(pthread_cancel(keep_thread))
{
mylog(log_warn,"pthread_cancel failed\n");
}
else
{
mylog(log_info,"pthread_cancel success\n");
}
}
clear_iptables_rule();
exit(a);
}
void signal_handler(int sig)
{
about_to_exit=1;
// myexit(0);
}
int numbers_to_char(id_t id1,id_t id2,id_t id3,char * &data,int &len)
{
static char buf[buf_len];
data=buf;
id_t tmp=htonl(id1);
memcpy(buf,&tmp,sizeof(tmp));
tmp=htonl(id2);
memcpy(buf+sizeof(tmp),&tmp,sizeof(tmp));
tmp=htonl(id3);
memcpy(buf+sizeof(tmp)*2,&tmp,sizeof(tmp));
len=sizeof(id_t)*3;
return 0;
}
int char_to_numbers(const char * data,int len,id_t &id1,id_t &id2,id_t &id3)
{
if(len<int(sizeof(id_t)*3)) return -1;
id1=ntohl( *((id_t*)(data+0)) );
id2=ntohl( *((id_t*)(data+sizeof(id_t))) );
id3=ntohl( *((id_t*)(data+sizeof(id_t)*2)) );
return 0;
}
int hex_to_u32(const string & a,u32_t &output)
{
//string b="0x";
//b+=a;
if(sscanf(a.c_str(),"%x",&output)==1)
{
//printf("%s %x\n",a.c_str(),output);
return 0;
}
mylog(log_error,"<%s> doesnt contain a hex\n",a.c_str());
return -1;
}
int hex_to_u32_with_endian(const string & a,u32_t &output)
{
//string b="0x";
//b+=a;
if(sscanf(a.c_str(),"%x",&output)==1)
{
output=htonl(output);
//printf("%s %x\n",a.c_str(),output);
return 0;
}
mylog(log_error,"<%s> doesnt contain a hex\n",a.c_str());
return -1;
}
bool larger_than_u32(u32_t a,u32_t b)
{
u32_t smaller,bigger;
smaller=min(a,b);//smaller in normal sense
bigger=max(a,b);
u32_t distance=min(bigger-smaller,smaller+(0xffffffff-bigger+1));
if(distance==bigger-smaller)
{
if(bigger==a)
{
return 1;
}
else
{
return 0;
}
}
else
{
if(smaller==b)
{
return 0;
}
else
{
return 1;
}
}
}
bool larger_than_u16(uint16_t a,uint16_t b)
{
uint16_t smaller,bigger;
smaller=min(a,b);//smaller in normal sense
bigger=max(a,b);
uint16_t distance=min(bigger-smaller,smaller+(0xffff-bigger+1));
if(distance==bigger-smaller)
{
if(bigger==a)
{
return 1;
}
else
{
return 0;
}
}
else
{
if(smaller==b)
{
return 0;
}
else
{
return 1;
}
}
}
vector<string> string_to_vec(const char * s,const char * sp) {
vector<string> res;
string str=s;
char *p = strtok ((char *)str.c_str(),sp);
while (p != NULL)
{
res.push_back(p);
//printf ("%s\n",p);
p = strtok(NULL, sp);
}
/* for(int i=0;i<(int)res.size();i++)
{
printf("<<%s>>\n",res[i].c_str());
}*/
return res;
}
vector< vector <string> > string_to_vec2(const char * s)
{
vector< vector <string> > res;
vector<string> lines=string_to_vec(s,"\n");
for(int i=0;i<int(lines.size());i++)
{
vector<string> tmp;
tmp=string_to_vec(lines[i].c_str(),"\t ");
res.push_back(tmp);
}
return res;
}
int read_file(const char * file,string &output)
{
const int max_len=2*1024*1024;
static char buf[max_len+100];
buf[sizeof(buf)-1]=0;
int fd=open(file,O_RDONLY);
if(fd==-1)
{
mylog(log_error,"read_file %s fail\n",file);
return -1;
}
int len=read(fd,buf,max_len);
if(len==max_len)
{
buf[0]=0;
mylog(log_error,"%s too long,buf not large enough\n",file);
return -2;
}
else if(len<0)
{
buf[0]=0;
mylog(log_error,"%s read fail %d\n",file,len);
return -3;
}
else
{
buf[len]=0;
output=buf;
}
return 0;
}
int run_command(string command0,char * &output,int flag) {
FILE *in;
if((flag&show_log)==0) command0+=" 2>&1 ";
const char * command=command0.c_str();
int level= (flag&show_log)?log_warn:log_debug;
if(flag&show_command)
{
mylog(log_info,"run_command %s\n",command);
}
else
{
mylog(log_debug,"run_command %s\n",command);
}
static __thread char buf[1024*1024+100];
buf[sizeof(buf)-1]=0;
if(!(in = popen(command, "r"))){
mylog(level,"command %s popen failed,errno %s\n",command,strerror(errno));
return -1;
}
int len =fread(buf, 1024*1024, 1, in);
if(len==1024*1024)
{
buf[0]=0;
mylog(level,"too long,buf not larger enough\n");
return -2;
}
else
{
buf[len]=0;
}
int ret;
if(( ret=ferror(in) ))
{
mylog(level,"command %s fread failed,ferror return value %d \n",command,ret);
return -3;
}
//if(output!=0)
output=buf;
ret= pclose(in);
int ret2=WEXITSTATUS(ret);
if(ret!=0||ret2!=0)
{
mylog(level,"commnad %s ,pclose returned %d ,WEXITSTATUS %d,errnor :%s \n",command,ret,ret2,strerror(errno));
return -4;
}
return 0;
}
/*
int run_command_no_log(string command0,char * &output) {
FILE *in;
command0+=" 2>&1 ";
const char * command=command0.c_str();
mylog(log_debug,"run_command_no_log %s\n",command);
static char buf[1024*1024+100];
buf[sizeof(buf)-1]=0;
if(!(in = popen(command, "r"))){
mylog(log_debug,"command %s popen failed,errno %s\n",command,strerror(errno));
return -1;
}
int len =fread(buf, 1024*1024, 1, in);
if(len==1024*1024)
{
buf[0]=0;
mylog(log_debug,"too long,buf not larger enough\n");
return -2;
}
else
{
buf[len]=0;
}
int ret;
if(( ret=ferror(in) ))
{
mylog(log_debug,"command %s fread failed,ferror return value %d \n",command,ret);
return -3;
}
//if(output!=0)
output=buf;
ret= pclose(in);
int ret2=WEXITSTATUS(ret);
if(ret!=0||ret2!=0)
{
mylog(log_debug,"commnad %s ,pclose returned %d ,WEXITSTATUS %d,errnor :%s \n",command,ret,ret2,strerror(errno));
return -4;
}
return 0;
}*/
// Remove preceding and trailing characters
string trim(const string& str, char c) {
size_t first = str.find_first_not_of(c);
if(string::npos==first)
{
return "";
}
size_t last = str.find_last_not_of(c);
return str.substr(first,(last-first+1));
}
vector<string> parse_conf_line(const string& s)
{
char buf[s.length()+200];
char *p=buf;
int i=int(s.length())-1;
int j;
vector<string>res;
strcpy(buf,(char *)s.c_str());
while(i>=0)
{
if(buf[i]==' ' || buf[i]== '\t')
buf[i]=0;
else break;
i--;
}
while(*p!=0)
{
if(*p==' ' || *p== '\t')
{
p++;
}
else break;
}
int new_len=strlen(p);
if(new_len==0)return res;
if(p[0]=='#') return res;
if(p[0]!='-')
{
mylog(log_fatal,"line :<%s> not begin with '-' ",s.c_str());
myexit(-1);
}
for(i=0;i<new_len;i++)
{
if(p[i]==' '||p[i]=='\t')
{
break;
}
}
if(i==new_len)
{
res.push_back(p);
return res;
}
j=i;
while(p[j]==' '||p[j]=='\t')
j++;
p[i]=0;
res.push_back(p);
res.push_back(p+j);
return res;
}
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