mirror of
https://github.com/bol-van/zapret.git
synced 2024-12-02 14:40:52 +03:00
670 lines
18 KiB
C
670 lines
18 KiB
C
#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/ip.h>
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#include <netdb.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <sys/select.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <sys/queue.h>
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#include <sys/epoll.h>
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#include <sys/ioctl.h>
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#include <signal.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <netinet/tcp.h>
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#include <getopt.h>
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#include <pwd.h>
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#include "tpws.h"
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#include "tpws_conn.h"
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enum splithttpreq {split_none=0,split_method,split_host};
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struct params_s
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{
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char bindaddr[64];
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uid_t uid;
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gid_t gid;
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uint16_t port;
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bool daemon;
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bool hostcase,hostdot,methodspace;
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char hostspell[4];
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enum splithttpreq split_http_req;
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int split_pos;
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int maxconn;
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};
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struct params_s params;
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unsigned char *find_bin(void *data,ssize_t len,const void *blk,ssize_t blk_len)
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{
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while (len>=blk_len)
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{
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if (!memcmp(data,blk,blk_len))
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return data;
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data=(char*)data+1;
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len--;
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}
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return NULL;
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}
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ssize_t send_with_flush(int sockfd, const void *buf, size_t len, int flags)
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{
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int flag,err;
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ssize_t wr;
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flag=1;
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setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int));
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wr=send(sockfd,buf,len,flags);
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err=errno;
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flag=0;
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setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int));
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errno=err;
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return wr;
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}
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void close_tcp_conn(tproxy_conn_t *conn, struct tailhead *conn_list,
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struct tailhead *close_list){
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conn->state = CONN_CLOSED;
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TAILQ_REMOVE(conn_list, conn, conn_ptrs);
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TAILQ_INSERT_TAIL(close_list, conn, conn_ptrs);
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}
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static const char *http_split_methods[]={"GET /","POST /","HEAD /","OPTIONS /",NULL};
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static const char *http_split_host[]={"\r\nHost: ",NULL};
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#define RD_BLOCK_SIZE 8192
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bool handle_epollin(tproxy_conn_t *conn,int *data_transferred){
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int numbytes;
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int fd_in, fd_out;
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bool bOutgoing;
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ssize_t rd=0,wr=0,bs;
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//Easy way to determin which socket is ready for reading
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//TODO: Optimize. This one allows me quick lookup for conn, but
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//I need to make a system call to determin which socket
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numbytes=0;
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if(ioctl(conn->local_fd, FIONREAD, &numbytes) != -1
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&& numbytes > 0){
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fd_in = conn->local_fd;
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fd_out = conn->remote_fd;
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bOutgoing = true;
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} else {
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fd_in = conn->remote_fd;
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fd_out = conn->local_fd;
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numbytes=0;
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ioctl(fd_in, FIONREAD, &numbytes);
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bOutgoing = false;
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}
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if (numbytes)
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{
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if (bOutgoing)
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{
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char buf[RD_BLOCK_SIZE+2],*p,*phost=NULL;
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ssize_t l,split_pos=0,method_split_pos=0,host_split_pos=0,split_array_pos_offset=1,pos;
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const char **split_array=NULL, **split_item, **item;
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rd = recv(fd_in,buf,RD_BLOCK_SIZE,MSG_DONTWAIT);
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if (rd>0)
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{
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bs = rd;
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if (params.methodspace)
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{
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for(item=http_split_methods;*item;item++)
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{
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l = strlen(*item);
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if (p=find_bin(buf,bs,*item,l))
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{
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pos = p-buf;
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printf("Found http method '%s' at pos %zd. Adding extra space.\n",*item,pos);
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p += l-1;
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pos += l-1;
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memmove(p+1,p,bs-pos);
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*p = ' '; // insert extra space
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bs++; // block will grow by 1 byte
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method_split_pos = pos-2; // remember split position and use it if required
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break;
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}
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}
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}
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if (params.hostdot)
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{
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if (phost=find_bin(buf,bs,"\r\nHost: ",8))
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{
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host_split_pos = phost-buf+7;
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p = phost+8;
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while(p<(buf+bs) && *p!='\r' && *p!='\n') p++;
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if (p<(buf+bs))
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{
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pos = p-buf;
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printf("Adding dot to host name at pos %zd\n",pos);
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memmove(p+1,p,bs-pos);
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*p = '.'; // insert dot
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bs++; // block will grow by 1 byte
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}
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}
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}
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if (params.split_pos)
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{
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split_pos = params.split_pos<bs ? params.split_pos : 0;
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}
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else
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{
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switch (params.split_http_req)
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{
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case split_method:
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// do we have already split position ? if so use it without another search
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if (method_split_pos)
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split_pos = method_split_pos;
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else
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{
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split_array = http_split_methods;
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split_array_pos_offset = 3;
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}
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break;
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case split_host:
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if (host_split_pos)
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split_pos = host_split_pos;
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else
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split_array = http_split_host;
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break;
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}
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}
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if (split_array)
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{
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// we havent found split post yet. need to search.
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for(split_item=split_array;*split_item;split_item++)
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{
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l = strlen(*split_item);
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if (p=find_bin(buf,bs,*split_item,l))
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{
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split_pos = p-buf;
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printf("Found split item '%s' at pos %zd. Split offset is -%zd.\n",*split_item,split_pos,split_array_pos_offset);
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split_pos += l-split_array_pos_offset;
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break;
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}
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}
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}
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if (params.hostcase)
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{
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if (phost || (phost=find_bin(buf,bs,"\r\nHost: ",8)))
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{
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printf("Changing 'Host:' => '%c%c%c%c:' at pos %zd\n",params.hostspell[0],params.hostspell[1],params.hostspell[2],params.hostspell[3],phost-buf+2);
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memcpy(phost+2,params.hostspell,4);
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}
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}
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if (split_pos)
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{
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printf("Splitting at pos %zd\n",split_pos);
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wr=send_with_flush(fd_out,buf,split_pos,0);
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if (wr>=0)
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wr=send(fd_out,buf+split_pos,bs-split_pos,0);
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}
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else
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{
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wr=send(fd_out,buf,bs,0);
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}
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}
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}
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else
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{
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// *** we are not interested in incoming traffic
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// splice it without processing
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//printf("splicing numbytes=%d\n",numbytes);
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rd = numbytes = splice(fd_in, NULL, conn->splice_pipe[1], NULL,
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SPLICE_LEN, SPLICE_F_MOVE | SPLICE_F_NONBLOCK);
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//printf("spliced rd=%d\n",rd);
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if (rd>0)
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{
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wr = splice(conn->splice_pipe[0], NULL, fd_out, NULL,
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rd, SPLICE_F_MOVE);
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}
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//printf("splice rd=%d wr=%d\n",rd,wr);
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}
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}
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if (data_transferred) *data_transferred = rd<0 ? 0 : rd;
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return rd!=-1 && wr!=-1;
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}
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void remove_closed_connections(struct tailhead *close_list){
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tproxy_conn_t *conn = NULL;
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while(close_list->tqh_first != NULL){
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conn = (tproxy_conn_t*) close_list->tqh_first;
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TAILQ_REMOVE(close_list, close_list->tqh_first, conn_ptrs);
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int rd=0;
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while(handle_epollin(conn,&rd) && rd);
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printf("Socket %d and %d closed, connection removed\n",
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conn->local_fd, conn->remote_fd);
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free_conn(conn);
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}
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}
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int event_loop(int listen_fd){
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int retval = 0, num_events = 0;
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int tmp_fd = 0; //Used to temporarily hold the accepted file descriptor
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tproxy_conn_t *conn = NULL;
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int efd, i;
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struct epoll_event ev, events[MAX_EPOLL_EVENTS];
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struct tailhead conn_list, close_list;
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uint8_t check_close = 0;
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int conncount = 0;
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//Initialize queue (remember that TAILQ_HEAD just defines the struct)
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TAILQ_INIT(&conn_list);
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TAILQ_INIT(&close_list);
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if((efd = epoll_create(1)) == -1){
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perror("epoll_create");
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return -1;
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}
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//Start monitoring listen socket
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memset(&ev, 0, sizeof(ev));
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ev.events = EPOLLIN;
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//There is only one listen socket, and I want to use ptr in order to have
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//easy access to the connections. So if ptr is NULL that means an event on
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//listen socket.
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ev.data.ptr = NULL;
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if(epoll_ctl(efd, EPOLL_CTL_ADD, listen_fd, &ev) == -1){
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perror("epoll_ctl (listen socket)");
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return -1;
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}
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while(1){
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if((num_events = epoll_wait(efd, events, MAX_EPOLL_EVENTS, -1)) == -1){
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perror("epoll_wait");
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retval = -1;
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break;
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}
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for(i=0; i<num_events; i++){
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if(events[i].data.ptr == NULL){
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//Accept new connection
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tmp_fd = accept(listen_fd, NULL, 0);
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if (tmp_fd<0)
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{
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fprintf(stderr, "Failed to accept connection\n");
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}
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else if (conncount>=params.maxconn)
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{
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close(tmp_fd);
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fprintf(stderr, "Too much connections : %d\n",conncount);
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}
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else if((conn = add_tcp_connection(efd, &conn_list, tmp_fd, params.port)) == NULL)
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{
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close(tmp_fd);
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fprintf(stderr, "Failed to add connection\n");
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}
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else
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{
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conncount++;
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printf("Connections : %d\n",conncount);
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}
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} else {
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conn = (tproxy_conn_t*) events[i].data.ptr;
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//Only applies to remote_fd, connection attempt has
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//succeeded/failed
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if(events[i].events & EPOLLOUT){
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if(check_connection_attempt(conn, efd) == -1){
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fprintf(stderr, "Connection attempt failed for %d\n",
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conn->remote_fd);
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check_close = 1;
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close_tcp_conn(conn, &conn_list, &close_list);
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conncount--;
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}
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continue;
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} else if(conn->state != CONN_CLOSED &&
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(events[i].events & EPOLLRDHUP ||
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events[i].events & EPOLLHUP ||
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events[i].events & EPOLLERR)){
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check_close = 1;
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close_tcp_conn(conn, &conn_list, &close_list);
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conncount--;
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continue;
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}
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//Since I use an event cache, earlier events might cause for
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//example this connection to be closed. No need to process fd if
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//that is the case
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if(conn->state == CONN_CLOSED){
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continue;
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}
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if (!handle_epollin(conn,NULL)){
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close_tcp_conn(conn, &conn_list, &close_list);
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conncount--;
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check_close = 1;
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}
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}
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}
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//Remove connections
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if(check_close)
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remove_closed_connections(&close_list);
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check_close = 0;
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}
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//Add cleanup
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return retval;
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}
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int8_t block_sigpipe(){
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sigset_t sigset;
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memset(&sigset, 0, sizeof(sigset));
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//Get the old sigset, add SIGPIPE and update sigset
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if(sigprocmask(SIG_BLOCK, NULL, &sigset) == -1){
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perror("sigprocmask (get)");
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return -1;
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}
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if(sigaddset(&sigset, SIGPIPE) == -1){
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perror("sigaddset");
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return -1;
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}
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if(sigprocmask(SIG_BLOCK, &sigset, NULL) == -1){
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perror("sigprocmask (set)");
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return -1;
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}
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return 0;
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}
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void exithelp()
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{
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printf(" --bind-addr=<ipv4_addr>|<ipv6_addr>\n --port=<port>\n --maxconn=<max_connections>\n --split-http-req=method|host\n --split-pos=<numeric_offset>\t; split at specified pos. invalidates split-http-req.\n --hostcase\t\t; change Host: => host:\n --hostspell\t\t; exact spelling of \"Host\" header. must be 4 chars. default is \"host\"\n --hostdot\t\t; add \".\" after Host: name\n --methodspace\t\t; add extra space after method\n --daemon\t\t; daemonize\n --user=<username>\t; drop root privs\n");
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exit(1);
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}
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void parse_params(int argc, char *argv[])
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{
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int option_index=0;
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int v,i;
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memset(¶ms,0,sizeof(params));
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memcpy(params.hostspell,"host",4); // default hostspell
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params.maxconn = DEFAULT_MAX_CONN;
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const struct option long_options[] = {
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{"help",no_argument,0,0},// optidx=0
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{"h",no_argument,0,0},// optidx=1
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{"bind-addr",required_argument,0,0},// optidx=2
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{"port",required_argument,0,0},// optidx=3
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{"daemon",no_argument,0,0},// optidx=4
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{"user",required_argument,0,0},// optidx=5
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{"maxconn",required_argument,0,0},// optidx=6
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{"hostcase",no_argument,0,0},// optidx=7
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{"hostspell",required_argument,0,0},// optidx=8
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{"hostdot",no_argument,0,0},// optidx=9
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{"split-http-req",required_argument,0,0},// optidx=10
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{"split-pos",required_argument,0,0},// optidx=11
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{"methodspace",no_argument,0,0},// optidx=12
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{NULL,0,NULL,0}
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};
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while ((v=getopt_long_only(argc,argv,"",long_options,&option_index))!=-1)
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{
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if (v) exithelp();
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switch(option_index)
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{
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case 0:
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case 1:
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exithelp();
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break;
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case 2: /* bind-addr */
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strncpy(params.bindaddr,optarg,sizeof(params.bindaddr));
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params.bindaddr[sizeof(params.bindaddr)-1] = 0;
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break;
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case 3: /* qnum */
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i=atoi(optarg);
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if (i<=0 || i>65535)
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{
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fprintf(stderr,"bad port number\n");
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exit(1);
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}
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params.port=(uint16_t)i;
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break;
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case 4: /* daemon */
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params.daemon = true;
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break;
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case 5: /* user */
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{
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struct passwd *pwd = getpwnam(optarg);
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if (!pwd)
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{
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fprintf(stderr,"non-existent username supplied\n");
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exit(1);
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}
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params.uid = pwd->pw_uid;
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params.gid = pwd->pw_gid;
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break;
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}
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case 6: /* maxconn */
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params.maxconn=atoi(optarg);
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if (params.maxconn<=0)
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{
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fprintf(stderr,"bad maxconn\n");
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exit(1);
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}
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break;
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case 7: /* hostcase */
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params.hostcase = true;
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break;
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case 8: /* hostspell */
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if (strlen(optarg)!=4)
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{
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fprintf(stdout,"hostspell must be exactly 4 chars long\n");
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exit(1);
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}
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params.hostcase = true;
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memcpy(params.hostspell,optarg,4);
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break;
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case 9: /* hostdot */
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params.hostdot = true;
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break;
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case 10: /* split-http-req */
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if (!strcmp(optarg,"method"))
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params.split_http_req = split_method;
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else if (!strcmp(optarg,"host"))
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params.split_http_req = split_host;
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else
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{
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fprintf(stderr,"Invalid argument for split-http-req\n");
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exit(1);
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}
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break;
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case 11: /* split-pos */
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i = atoi(optarg);
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if (i)
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params.split_pos = i;
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else
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{
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fprintf(stderr,"Invalid argument for split-pos\n");
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exit(1);
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}
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break;
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case 12: /* methodspace */
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params.methodspace = true;
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break;
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}
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}
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if (!params.port)
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{
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fprintf(stderr,"Need port number\n");
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exit(1);
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}
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}
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void daemonize()
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{
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int pid;
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pid = fork();
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if (pid == -1)
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{
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perror("fork: ");
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exit(2);
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}
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else if (pid != 0)
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exit(0);
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if (setsid() == -1)
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exit(2);
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if (chdir ("/") == -1)
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exit(2);
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close(STDIN_FILENO);
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close(STDOUT_FILENO);
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close(STDERR_FILENO);
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/* redirect fd's 0,1,2 to /dev/null */
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open ("/dev/null", O_RDWR);
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/* stdin */
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dup(0);
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/* stdout */
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dup(0);
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/* stderror */
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}
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bool droproot()
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{
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if (params.uid)
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{
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if (setgid(params.gid))
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{
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perror("setgid: ");
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return false;
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}
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if (setuid(params.uid))
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{
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perror("setuid: ");
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return false;
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}
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}
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return true;
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}
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int main(int argc, char *argv[]){
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int listen_fd = 0;
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int yes = 1, retval = 0;
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int r;
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struct sockaddr_storage salisten;
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socklen_t salisten_len;
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int ipv6_only;
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parse_params(argc,argv);
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memset(&salisten,0,sizeof(salisten));
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if (*params.bindaddr)
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{
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if (inet_pton(AF_INET,params.bindaddr, &((struct sockaddr_in*)&salisten)->sin_addr))
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{
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salisten.ss_family = AF_INET;
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((struct sockaddr_in*)&salisten)->sin_port = htons(params.port);
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salisten_len = sizeof(struct sockaddr_in);
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}
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else if (inet_pton(AF_INET6,params.bindaddr, &((struct sockaddr_in6*)&salisten)->sin6_addr))
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{
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salisten.ss_family = AF_INET6;
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((struct sockaddr_in6*)&salisten)->sin6_port = htons(params.port);
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salisten_len = sizeof(struct sockaddr_in6);
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ipv6_only=1;
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}
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else
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{
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printf("bad bind addr\n");
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exit(1);
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}
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}
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else
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{
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salisten.ss_family = AF_INET6;
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((struct sockaddr_in6*)&salisten)->sin6_port = htons(params.port);
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salisten_len = sizeof(struct sockaddr_in6);
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ipv6_only=0;
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// leave sin6_addr zero
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}
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if (params.daemon) daemonize();
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if((listen_fd = socket(salisten.ss_family, SOCK_STREAM, 0)) == -1){
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perror("socket: ");
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exit(EXIT_FAILURE);
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}
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if ((salisten.ss_family==AF_INET6) && setsockopt(listen_fd, IPPROTO_IPV6, IPV6_V6ONLY, &ipv6_only, sizeof(ipv6_only)) == -1)
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{
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perror("setsockopt (IPV6_ONLY): ");
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close(listen_fd);
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exit(EXIT_FAILURE);
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}
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if(setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1)
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{
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perror("setsockopt (SO_REUSEADDR): ");
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close(listen_fd);
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exit(EXIT_FAILURE);
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}
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//Mark that this socket can be used for transparent proxying
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//This allows the socket to accept connections for non-local IPs
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if(setsockopt(listen_fd, SOL_IP, IP_TRANSPARENT, &yes, sizeof(yes)) == -1)
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{
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perror("setsockopt (IP_TRANSPARENT): ");
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close(listen_fd);
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exit(EXIT_FAILURE);
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}
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if (!droproot())
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{
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close(listen_fd);
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exit(EXIT_FAILURE);
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}
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if(bind(listen_fd, (struct sockaddr *)&salisten, salisten_len) == -1){
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perror("bind: ");
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close(listen_fd);
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exit(EXIT_FAILURE);
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}
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if(listen(listen_fd, BACKLOG) == -1){
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perror("listen: ");
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close(listen_fd);
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exit(EXIT_FAILURE);
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}
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//splice() causes the process to receive the SIGPIPE-signal if one part (for
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//example a socket) is closed during splice(). I would rather have splice()
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//fail and return -1, so blocking SIGPIPE.
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if(block_sigpipe() == -1){
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fprintf(stderr, "Could not block SIGPIPE signal\n");
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close(listen_fd);
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exit(EXIT_FAILURE);
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}
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fprintf(stderr, "Will listen to port %d\n", params.port);
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retval = event_loop(listen_fd);
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close(listen_fd);
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fprintf(stderr, "Will exit\n");
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if(retval < 0)
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exit(EXIT_FAILURE);
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else
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exit(EXIT_SUCCESS);
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}
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