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修改： conf.c

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修改：     conf.h
	修改：     conf/cproxy.ini
	修改：     conf/cproxy.ini.explain
	修改：     cproxy.h
	修改：     cproxy_help.h
	修改：     cproxy_request.c
This commit is contained in:
aixiao 2019-02-19 17:29:58 +08:00
parent a2f0dc3992
commit 4072556043
7 changed files with 361 additions and 65 deletions
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156
conf.c
View File

@ -6,81 +6,163 @@ void read_conf(char *file, conf *p)
// server module
p->server_port = iniparser_getint(ini, "server:PORT", 0);
p->len_server_pid_file =
strlen(iniparser_getstring(ini, "server:PID_FILE", NULL)) + 1;
p->len_server_pid_file = strlen(iniparser_getstring(ini, "server:PID_FILE", NULL)) + 1;
p->server_pid_file = (char *)malloc(p->len_server_pid_file);
if (p->server_pid_file == NULL) {
goto err;
}
memset(p->server_pid_file, 0, p->len_server_pid_file);
memcpy(p->server_pid_file,
iniparser_getstring(ini, "server:PID_FILE", NULL),
p->len_server_pid_file);
memcpy(p->server_pid_file, iniparser_getstring(ini, "server:PID_FILE", NULL), p->len_server_pid_file);
// http module
// http ip
p->len_http_ip = strlen(iniparser_getstring(ini, "http:http_ip", NULL)) + 1;
p->http_ip = (char *)malloc(p->len_http_ip);
if (p->http_ip == NULL) {
goto err;
}
memset(p->http_ip, 0, p->len_http_ip);
memcpy(p->http_ip, iniparser_getstring(ini, "http:http_ip", NULL),
p->len_http_ip);
memcpy(p->http_ip, iniparser_getstring(ini, "http:http_ip", NULL), p->len_http_ip);
// http port
p->http_port = iniparser_getint(ini, "http:http_port", 0);
p->len_http_del =
strlen(iniparser_getstring(ini, "http:http_del", NULL)) + 1;
// http del
p->len_http_del = strlen(iniparser_getstring(ini, "http:http_del", NULL)) + 1;
p->http_del = (char *)malloc(p->len_http_del);
if (p->http_del == NULL) {
goto err;
}
memset(p->http_del, 0, p->len_http_del);
memcpy(p->http_del, iniparser_getstring(ini, "http:http_del", NULL),
p->len_http_del);
memcpy(p->http_del, iniparser_getstring(ini, "http:http_del", NULL), p->len_http_del);
p->len_http_first =
strlen(iniparser_getstring(ini, "http:http_first", NULL)) + 1;
// http first
p->len_http_first = strlen(iniparser_getstring(ini, "http:http_first", NULL)) + 1;
p->http_first = (char *)malloc(p->len_http_first);
if (p->http_first == NULL) {
goto err;
}
memset(p->http_first, 0, p->len_http_first);
memcpy(p->http_first, iniparser_getstring(ini, "http:http_first", NULL),
p->len_http_first);
memcpy(p->http_first, iniparser_getstring(ini, "http:http_first", NULL), p->len_http_first);
// https module
p->len_https_ip =
strlen(iniparser_getstring(ini, "https:https_ip", NULL)) + 1;
// https ip
p->len_https_ip = strlen(iniparser_getstring(ini, "https:https_ip", NULL)) + 1;
p->https_ip = (char *)malloc(p->len_https_ip);
if (p->https_ip == NULL) {
goto err;
}
memset(p->https_ip, 0, p->len_http_ip);
memcpy(p->https_ip, iniparser_getstring(ini, "https:https_ip", NULL),
p->len_https_ip);
memcpy(p->https_ip, iniparser_getstring(ini, "https:https_ip", NULL), p->len_https_ip);
//https port
p->https_port = iniparser_getint(ini, "https:https_port", 0);
p->len_https_del =
strlen(iniparser_getstring(ini, "https:https_del", NULL)) + 1;
// https del
p->len_https_del = strlen(iniparser_getstring(ini, "https:https_del", NULL)) + 1;
p->https_del = (char *)malloc(p->len_https_del);
if (p->https_del == NULL) {
goto err;
}
memset(p->https_del, 0, p->len_https_del);
memcpy(p->https_del, iniparser_getstring(ini, "https:https_del", NULL),
p->len_https_del);
memcpy(p->https_del, iniparser_getstring(ini, "https:https_del", NULL), p->len_https_del);
p->len_https_first =
strlen(iniparser_getstring(ini, "https:https_first", NULL)) + 1;
// https first
p->len_https_first = strlen(iniparser_getstring(ini, "https:https_first", NULL)) + 1;
p->https_first = (char *)malloc(p->len_https_first);
if (p->https_first == NULL) {
goto err;
}
memset(p->https_first, 0, p->len_https_first);
memcpy(p->https_first, iniparser_getstring(ini, "https:https_first", NULL),
p->len_https_first);
memcpy(p->https_first, iniparser_getstring(ini, "https:https_first", NULL), p->len_https_first);
// http strrep
if (iniparser_find_entry(ini, "http:strrep") == 1) {
p->len_http_strrep = strlen(iniparser_getstring(ini, "http:strrep", NULL)) + 1;
p->http_strrep = (char *)malloc(p->len_http_strrep);
if (p->http_strrep == NULL) {
free(p->http_strrep);
}
memset(p->http_strrep, 0, p->len_http_strrep);
memcpy(p->http_strrep, iniparser_getstring(ini, "http:strrep", NULL), p->len_http_strrep);
char *p1 = strstr(p->http_strrep, "->");
p->http_strrep_aim = (char *)malloc(strlen(p->http_strrep) - strlen(p1+2) -2 + 1);
if (p->http_strrep_aim == NULL) {
free(p->http_strrep_aim);
}
strncpy_(p->http_strrep_aim, p->http_strrep, strlen(p->http_strrep) - strlen(p1+2) - 2);
p->http_strrep_obj = (char *)malloc(strlen(p1+2) + 1);
if (p->http_strrep_obj == NULL) {
free(p->http_strrep_obj);
}
strncpy_(p->http_strrep_obj, p1+2, strlen(p1+2));
}
// https strrep
if (iniparser_find_entry(ini, "https:strrep") == 1) {
p->len_https_strrep = strlen(iniparser_getstring(ini, "https:strrep", NULL)) + 1;
p->https_strrep = (char *)malloc(p->len_https_strrep);
if (p->https_strrep == NULL) {
free(p->https_strrep);
}
memset(p->https_strrep, 0, p->len_https_strrep);
memcpy(p->https_strrep, iniparser_getstring(ini, "https:strrep", NULL), p->len_https_strrep);
char *p2 = strstr(p->https_strrep, "->");
p->https_strrep_aim = (char *)malloc(strlen(p->https_strrep) - strlen(p2+2) -2 + 1);
if (p->https_strrep_aim == NULL) {
free(p->https_strrep_aim);
}
strncpy_(p->https_strrep_aim, p->https_strrep, strlen(p->https_strrep) - strlen(p2+2) - 2);
p->https_strrep_obj = (char *)malloc(strlen(p2+2) + 1);
if (p->https_strrep_obj == NULL) {
free(p->https_strrep_obj);
}
strncpy_(p->https_strrep_obj, p2+2, strlen(p2+2));
}
// http regrep
if (iniparser_find_entry(ini, "http:regrep") == 1) {
p->len_http_regrep = strlen(iniparser_getstring(ini, "http:regrep", NULL)) + 1;
p->http_regrep = (char *)malloc(p->len_http_regrep);
if (p->http_regrep == NULL) {
free(p->http_regrep);
}
memset(p->http_regrep, 0, p->len_http_regrep);
memcpy(p->http_regrep, iniparser_getstring(ini, "http:regrep", NULL), p->len_http_regrep);
char *p3 = strstr(p->http_regrep, "->");
p->http_regrep_aim = (char *)malloc(strlen(p->http_regrep) - strlen(p3+2) -2 + 1);
if (p->http_regrep_aim == NULL) {
free(p->http_regrep_aim);
}
strncpy_(p->http_regrep_aim, p->http_regrep, strlen(p->http_regrep) - strlen(p3+2) - 2);
p->http_regrep_obj = (char *)malloc(strlen(p3+2) + 1);
if (p->http_regrep_obj == NULL) {
free(p->http_regrep_obj);
}
strncpy_(p->http_regrep_obj, p3+2, strlen(p3+2));
}
// https regrep
if (iniparser_find_entry(ini, "https:regrep") == 1) {
p->len_https_regrep = strlen(iniparser_getstring(ini, "https:regrep", NULL)) + 1;
p->https_regrep = (char *)malloc(p->len_https_regrep);
if (p->https_regrep == NULL) {
free(p->https_regrep);
}
memset(p->https_regrep, 0, p->len_https_regrep);
memcpy(p->https_regrep, iniparser_getstring(ini, "https:regrep", NULL), p->len_https_regrep);
char *p4 = strstr(p->https_regrep, "->");
p->https_regrep_aim = (char *)malloc(strlen(p->https_regrep) - strlen(p4+2) -2 + 1);
if (p->https_regrep_aim == NULL) {
free(p->https_regrep_aim);
}
strncpy_(p->https_regrep_aim, p->https_regrep, strlen(p->https_regrep) - strlen(p4+2) - 2);
p->https_regrep_obj = (char *)malloc(strlen(p4+2) + 1);
if (p->https_regrep_obj == NULL) {
free(p->https_regrep_obj);
}
strncpy_(p->https_regrep_obj, p4+2, strlen(p4+2));
}
err:
if (p->server_pid_file == NULL)
@ -110,5 +192,19 @@ void free_conf(conf *p)
free(p->https_ip);
free(p->https_del);
free(p->https_first);
}
free(p->http_strrep);
free(p->http_strrep_aim);
free(p->http_strrep_obj);
free(p->https_strrep);
free(p->https_strrep_aim);
free(p->https_strrep_obj);
free(p->http_regrep);
free(p->http_regrep_aim);
free(p->http_regrep_obj);
free(p->https_regrep);
free(p->https_regrep_aim);
free(p->https_regrep_obj);
}

1
conf.h
View File

@ -3,6 +3,7 @@
#include "iniparser.h"
#include "cproxy.h"
char *strncpy_(char *dest, const char *src, size_t n);
void read_conf(char *file, conf *p);
void free_conf(conf *p);

5
conf/cproxy.ini
View File

@ -7,9 +7,14 @@ http_ip=10.0.0.172;
http_port=80;
http_del="x-online-host,X-Online-Host,host,Host";
http_first="[M] [U] [V]\r\n.aixiao.me\rx-online-host: [host]\r\nhost: iread.wo.cn\r\n";
strrep = "Mi MIX 2->Linux";
;regrep = "host*.+?->host: iread.wo.cn";
[https]
https_ip=10.0.0.172;
https_port=80;
https_del=",Host";
;https_first="[M] [U] [V]\r\nHost: [host]:[port]\r\n";
https_first="[M] iread.wo.cn//https://[host]:[port]:iread.wo.cn [V]\r\nHost: iread.wo.cn\r\n";
strrep = "Mi MIX 2->Linux";
regrep = "Host*.+?->Host: iread.wo.cn:443";

6
conf/cproxy.ini.explain
View File

@ -6,3 +6,9 @@
[V] 原请求协议版本
[host] 原请求host
[port] 原请求端口
关键字strrep替换字符串指令
strrep = "Mi MIX 2->Linux"; 以"->"为分界符,"Mi MIX 2"字符串替换为"Linux"字符串.
关键字regrep正则匹配替换字符串
regrep = "Host*.+?->Host: iread.wo.cn:443"; 以"->"为分界符,匹配到的内容"Host*.+?"替换为"Host: iread.wo.cn:443"字符串.

21
cproxy.h
View File

@ -14,9 +14,9 @@
#include <unistd.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define BUF_SIZE 8192
#define BUF_SIZES 1024
@ -58,6 +58,16 @@ typedef struct CONF {
int len_server_pid_file; // length
int len_http_ip, len_http_del, len_http_first;
int len_https_ip, len_https_del, len_https_first;
char *http_strrep, *http_regrep, *https_strrep, *https_regrep;
char *http_strrep_aim, *http_strrep_obj;
char *https_strrep_aim, *https_strrep_obj;
char *http_regrep_aim, *http_regrep_obj;
char *https_regrep_aim, *https_regrep_obj;
int len_http_strrep, len_http_regrep;
int len_https_strrep, len_https_regrep;
} conf;
// 请求类型
@ -75,12 +85,11 @@ int receive_data(int socket, char *buffer, int len);
void forward_data(int source_sock, int destination_sock);
int create_connection(conf *configure, int SIGN);
int create_server_socket(int port);
int init_daemon(int nochdir, int noclose, conf * configure);
int init_daemon(int nochdir, int noclose, conf *configure);
void sigchld_handler(int signal);
void server_loop(conf *configure);
void start_server(conf * configure);
void start_server(conf *configure);
int _main(int argc, char *argv[]);
void read_conf(char *file, conf *p);
void free_conf(conf *p);
int extract_host(char *header);

1
cproxy_help.h
View File

@ -3,7 +3,6 @@
#include <stdio.h>
#include "cproxy.h"
#define BUILD(fmt...) do { fprintf(stderr,"%s %s ",__DATE__,__TIME__); fprintf(stderr, ##fmt); } while(0)
char help_information(void);

226
cproxy_request.c
View File

@ -57,6 +57,87 @@ char *replace(char *replace_memory, int *replace_memory_len, const char *src, co
return replace_memory;
}
/* 正则表达式字符串替换，str为可用free释放的指针 */
static char *regrep(char *str, int *str_len, const char *src, char *dest, int dest_len)
{
if (!str || !src || !dest)
return NULL;
regmatch_t pm[10];
regex_t reg;
char child_num[2] = {'\\', '0'}, *p, *real_dest;
int match_len, real_dest_len, i;
p = str;
regcomp(&reg, src, REG_NEWLINE|REG_ICASE|REG_EXTENDED);
while (regexec(&reg, p, 10, pm, 0) == 0)
{
real_dest = (char *)malloc(dest_len);
if (real_dest == NULL)
{
regfree(&reg);
free(str);
return NULL;
}
memcpy(real_dest, dest, dest_len);
real_dest_len = dest_len;
//不进行不必要的字符串操作
if (pm[1].rm_so >= 0)
{
/* 替换目标字符串中的子表达式 */
for (i = 1; i < 10 && pm[i].rm_so > -1; i++)
{
child_num[1] = i + 48;
real_dest = replace(real_dest, &real_dest_len, child_num, 2, p + pm[i].rm_so, pm[i].rm_eo - pm[i].rm_so);
if (real_dest == NULL)
{
regfree(&reg);
free(str);
return NULL;
}
}
}
match_len = pm[0].rm_eo - pm[0].rm_so;
p += pm[0].rm_so;
//目标字符串不大于匹配字符串则不用分配新内存
if (match_len >= real_dest_len)
{
memcpy(p, real_dest, real_dest_len);
if (match_len > real_dest_len)
//strcpy(p + real_dest_len, p + match_len);
memmove(p + real_dest_len, p + match_len, *str_len - (p + match_len - str));
p += real_dest_len;
*str_len -= match_len - real_dest_len;
}
else
{
int diff;
char *before_end, *new_str;
diff = real_dest_len - match_len;
*str_len += diff;
new_str = (char *)realloc(str, *str_len + 1);
if (new_str == NULL)
{
free(str);
free(real_dest);
regfree(&reg);
return NULL;
}
str = new_str;
before_end = str + pm[0].rm_so;
p = before_end + real_dest_len;
memmove(p, p - diff, *str_len - (p - str) + 1);
memcpy(before_end, real_dest, real_dest_len);
}
free(real_dest);
}
regfree(&reg);
return str;
}
// 删除单个字符
void del_chr(char *s, char ch)
{
@ -202,11 +283,14 @@ int numbin(int n)
return sum;
}
// 删除字符串header_buffer中第一位到character处,并拼接string,character必须存在.(string替换第一个字符到character处)
// 删除字符串header_buffer中第一位到character处,并拼接string,character为空返回原字符串.(string替换第一个字符到character处)
char *splice_head(char *header_buffer, const char *character, char *string)
{
int len_first = strlen(string);
char *p1 = strstr(header_buffer, character);
if (p1 == NULL) {
return header_buffer;
}
p1 = p1 + 1;
char new_string[len_first + strlen(p1) + 1];
strcpy(new_string, string); // 拼接
@ -230,18 +314,43 @@ char *delete_header(char *header_buffer, const char *character, int string)
int replacement_http_head(char *header_buffer, char *remote_host, int *remote_port, int *SIGN, conf *p)
{
char *http_firsts = (char *)malloc(strlen(p->http_first) + 1);
strcpy(http_firsts, p->http_first); // 拷贝http_first
if (http_firsts) {
strcpy(http_firsts, p->http_first); // 拷贝http_first
} else {
free(http_firsts);
return 0;
}
char *https_firsts = (char *)malloc(strlen(p->https_first) + 1);
strcpy(https_firsts, p->https_first); // 拷贝https_first
if (https_firsts) {
strcpy(https_firsts, p->https_first); // 拷贝https_first
} else {
free(https_firsts);
return 0;
}
char *header_buffer_backup = (char *)malloc(strlen(header_buffer) + 1); // 拷贝原字符串
strcpy(header_buffer_backup, header_buffer);
if (header_buffer_backup) {
strcpy(header_buffer_backup, header_buffer);
} else {
free(header_buffer_backup);
return 0;
}
char *new_http_del = malloc(strlen(p->http_del) + 1); // 拷贝http_del
strcpy(new_http_del, p->http_del);
if (new_http_del) {
strcpy(new_http_del, p->http_del);
} else {
free(new_http_del);
return 0;
}
char *new_https_del = malloc(strlen(p->https_del) + 1); // 拷贝https_del
strcpy(new_https_del, p->https_del);
if (new_https_del) {
strcpy(new_https_del, p->https_del);
} else {
free(new_https_del);
return 0;
}
if (*SIGN == HTTP) {
char *result = NULL;
@ -254,23 +363,38 @@ int replacement_http_head(char *header_buffer, char *remote_host, int *remote_po
char *p2 = strstr(header_buffer_backup, "\n");
p2 = p2 + 1;
int len_http_head = strlen(header_buffer_backup) - strlen(p2);
char *HTTP_HEAD = (char *)malloc(len_http_head + 1); //http头第一行
strncpy_(HTTP_HEAD, header_buffer_backup, len_http_head);
char *HTTP_HEAD = (char *)malloc(len_http_head + 1); // http头第一行
if (HTTP_HEAD) {
strncpy_(HTTP_HEAD, header_buffer_backup, len_http_head);
} else {
free(HTTP_HEAD);
return 0;
}
// M
char *p3 = strstr(HTTP_HEAD, " ");
int l = strlen(HTTP_HEAD) - strlen(p3);
char *M = malloc(l + 1);
strncpy_(M, HTTP_HEAD, l);
//printf("%s", M);
if (M) {
strncpy_(M, HTTP_HEAD, l);
//printf("%s", M);
} else {
free(M);
return 0;
}
// U
p3 = p3 + 1;
char *p4 = strstr(p3, " ");
l = strlen(p3) - strlen(p4);
char *U = (char *)malloc(l + 1);
strncpy_(U, p3, l);
//printf("%s", U);
if (U) {
strncpy_(U, p3, l);
//printf("%s", U);
} else {
free(U);
return 0;
}
// V
p4 = p4 + 1;
@ -278,11 +402,21 @@ int replacement_http_head(char *header_buffer, char *remote_host, int *remote_po
del_chr(p4, '\n');
l = strlen(p4);
char *V = (char *)malloc(l);
strcpy(V, p4);
//printf("%s", V);
if (V) {
strcpy(V, p4);
//printf("%s", V);
} else {
free(V);
return 0;
}
char *new_header_buffer = (char *)malloc(strlen(splice_head(header_buffer_backup, "\n", http_firsts)) + 1);
strcpy(new_header_buffer, splice_head(header_buffer_backup, "\n", http_firsts));
if (new_header_buffer) {
strcpy(new_header_buffer, splice_head(header_buffer_backup, "\n", http_firsts));
} else {
free(new_header_buffer);
return 0;
}
int len = strlen(new_header_buffer);
int len_m = strlen(M);
@ -309,6 +443,15 @@ int replacement_http_head(char *header_buffer, char *remote_host, int *remote_po
new_header_buffer = replace(new_header_buffer, &len, "\\t", 2, "\t", 1);
new_header_buffer = replace(new_header_buffer, &len, "\\r", 2, "\r", 1);
new_header_buffer = replace(new_header_buffer, &len, "\\n", 2, "\n", 1);
if (p->http_strrep) {
int regrep_aim_len = strlen(p->http_strrep_aim);
int regrep_obj_len = strlen(p->http_strrep_obj);
new_header_buffer = replace(new_header_buffer, &len, p->http_strrep_aim, regrep_aim_len, p->http_strrep_obj, regrep_obj_len);
}
if (p->http_regrep) {
len = strlen(new_header_buffer) + 1;
new_header_buffer = regrep(new_header_buffer, &len, p->http_regrep_aim, p->http_regrep_obj, strlen(p->http_regrep_obj));
}
//stpcpy(p->http_ip, remote_host);
//p->http_port = *remote_port;
@ -333,39 +476,65 @@ int replacement_http_head(char *header_buffer, char *remote_host, int *remote_po
char *p2 = strstr(header_buffer_backup, "\n");
p2 = p2 + 1;
int len_https_head = strlen(header_buffer_backup) - strlen(p2);
char *HTTPS_HEAD = (char *)malloc(len_https_head + 1); //https头第一行
strncpy_(HTTPS_HEAD, header_buffer_backup, len_https_head);
char *HTTPS_HEAD = (char *)malloc(len_https_head + 1); // https头第一行
if (HTTPS_HEAD) {
strncpy_(HTTPS_HEAD, header_buffer_backup, len_https_head);
} else {
free(HTTPS_HEAD);
return 0;
}
// M
char *p3 = strstr(HTTPS_HEAD, " ");
int l = strlen(HTTPS_HEAD) - strlen(p3);
char *M = malloc(l + 1);
strncpy_(M, HTTPS_HEAD, l);
//printf("%s", M);
if (M) {
strncpy_(M, HTTPS_HEAD, l);
//printf("%s", M);
} else {
free(M);
return 0;
}
// U
p3 = p3 + 1;
char *p4 = strstr(p3, " ");
l = strlen(p3) - strlen(p4);
char *U = (char *)malloc(l + 1);
strncpy_(U, p3, l);
//printf("%s", U);
if (U) {
strncpy_(U, p3, l);
//printf("%s", U);
} else {
free(U);
return 0;
}
// V
p4 = p4 + 1;
l = strlen(p4);
char *V = (char *)malloc(l);
strncpy_(V, p4, 8);
//printf("%s", V);
if (V) {
strncpy_(V, p4, 8);
//printf("%s", V);
} else {
free(V);
return 0;
}
char *new_header_buffer = (char *) malloc(strlen(splice_head(header_buffer_backup, "\n", https_firsts)) + 1);
if (new_header_buffer) {
strcpy(new_header_buffer, splice_head(header_buffer_backup, "\n", https_firsts));
} else {
free(new_header_buffer);
return 0;
}
int len = strlen(new_header_buffer);
int len_m = strlen(M);
int len_u = strlen(U);
int len_v = strlen(V);
int len_remote_host = strlen(remote_host);
new_header_buffer = replace(new_header_buffer, &len, "[M]", 3, M, len_m);
new_header_buffer = replace(new_header_buffer, &len, "[U]", 3, U, len_u);
new_header_buffer = replace(new_header_buffer, &len, "[V]", 3, V, len_v);
@ -386,6 +555,17 @@ int replacement_http_head(char *header_buffer, char *remote_host, int *remote_po
new_header_buffer = replace(new_header_buffer, &len, "\\r", 2, "\r", 1);
new_header_buffer = replace(new_header_buffer, &len, "\\n", 2, "\n", 1);
if (p->https_strrep) {
int regrep_aim_len = strlen(p->https_strrep_aim);
int regrep_obj_len = strlen(p->https_strrep_obj);
new_header_buffer = replace(new_header_buffer, &len, p->https_strrep_aim, regrep_aim_len, p->https_strrep_obj, regrep_obj_len);
}
if (p->https_regrep) {
len = strlen(new_header_buffer) + 1;
new_header_buffer = regrep(new_header_buffer, &len, p->https_regrep_aim, p->https_regrep_obj, strlen(p->https_regrep_obj));
}
//stpcpy(p->https_ip, remote_host); // 走真实IP非代理
//p->https_port = *remote_port;
memset(header_buffer, 0, strlen(header_buffer));