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View Code? Open in Web Editor NEW一个轻量级的 socks5 代理, 带简单加密传输功能, 可穿透 GFW
License: MIT License
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Unable to build on Mac OS X
fd_set is no available on Mac
➜ socks5_c git:(master) make
cc -Wall -O0 -DDEBUG=1 -g -c -o local.o local.c
cc -Wall -O0 -DDEBUG=1 -g -c -o buffer.o buffer.c
cc -Wall -O0 -DDEBUG=1 -g -c -o encrypt.o encrypt.c
cc -Wall -O0 -DDEBUG=1 -g -c -o socket_wrap.o socket_wrap.c
cc -Wall -O0 -DDEBUG=1 -g -c -o socks.o socks.c
In file included from socks.c:1:
./socks.h:24:2: error: unknown type name 'fd_set'
fd_set rfds, wfds;
^
./socks.h:27:2: error: unknown type name 'fd_set'
fd_set _rfds, _wfds;
^
2 errors generated.
make: *** [socks.o] Error 1将所有阻塞io改为非阻塞io操作
select/poll/epoll 的阻塞io会严重影响性能.
client_connect() 阻塞: 一个页面连接不上就导致其他连接都等待在此
socket_wrap.c 中的 client_connect() 函数中, 当某个套接字阻塞在 gethostbyname() 或 connect() 时, 其他连接事件得不到及时处理, 一个打不开的网页就导致了其他正常页面都不能及时打开.
应改为非阻塞实现.
ss_remote_io_handle() 和 client_to_remote() 调用 ss_server_del_conn() 问题
假如 conn_fd 和 remote_fd 在一个 select() 返回后都可读, 而且都是关闭文件事件, 事件循环处理器稍后执行到 client_fo_remote() -> recv(conn_fd, ...) -> ss_server_del_conn() 会把这个 conn 结构体释放掉, 但在同一轮的事件循环处理中, 就要执行到 ss_remote_io_handle() -> recv(remote_fd, ...) -> ss_server_del_conn(), 这个 conn 在前面已经释放掉, 于是 segmentation fault (core dumped)!!!
不稳定啊，才翻墙不到一分钟，服务器上出现如下提示，怎么解决？
root@ar:~/socks5_c# debug_print: socks.c: 347: ss_request_handle():ss_get_requests() failed: Success
debug_print: server.c: 101: ss_io_handle():close
debug_print: socks.c: 347: ss_request_handle():ss_get_requests() failed: Success
debug_print: server.c: 101: ss_io_handle():close
debug_print: socks.c: 347: ss_request_handle():ss_get_requests() failed: Success
debug_print: server.c: 101: ss_io_handle():close
debug_print: socks.c: 347: ss_request_handle():ss_get_requests() failed: Success
debug_print: server.c: 101: ss_io_handle():close
debug_print: socks.c: 347: ss_request_handle():ss_get_requests() failed: Success
debug_print: server.c: 101: ss_io_handle():close
debug_print: socks.c: 347: ss_request_handle():ss_get_requests() failed: Success
debug_print: server.c: 101: ss_io_handle():close
debug_print: socks.c: 347: ss_request_handle():ss_get_requests() failed: Success
debug_print: server.c: 101: ss_io_handle():close
debug_print: socks.c: 347: ss_request_handle():ss_get_requests() failed: Success
debug_print: server.c: 101: ss_io_handle():close
debug_print: socks.c: 347: ss_request_handle():ss_get_requests() failed: Success
debug_print: server.c: 101: ss_io_handle():close
debug_print: socks.c: 347: ss_request_handle():ss_get_requests() failed: Success
debug_print: server.c: 101: ss_io_handle():close
debug_print: socks.c: 347: ss_request_handle():ss_get_requests() failed: Success
debug_print: server.c: 101: ss_io_handle():close
debug_print: socks.c: 347: ss_request_handle():ss_get_requests() failed: Success
debug_print: server.c: 101: ss_io_handle():close
debug_print: socks.c: 347: ss_request_handle():ss_get_requests() failed: Success
debug_print: server.c: 101: ss_io_handle():close
debug_print: socks.c: 347: ss_request_handle():ss_get_requests() failed: Success
debug_print: server.c: 101: ss_io_handle():close
root@ar:~/socks5_c#
不要调用 gethostbyname(3)
gethostbyname(3) 是阻塞的, 而且不支持 IPv6. 非阻塞 DNS 查询可以参考 TADNS
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