[原创]像pwntools一样操作python socket，而不要安装依赖

发表于: 2025-7-10 21:03 279

[原创]像pwntools一样操作python socket，而不要安装依赖

Jtian

2025-7-10 21:03

279

工具描述

一个简化的类pwntools工具，只有一个简单的py脚本，用来操作网络请求，适用于一些不太方便安装pwntools的离线场景。因为刻意的保留了pwntools风格，所以也比较方便后续代码的移植和分享。

minipwn.py

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
 
import socket
import struct
import sys
import select
import os
import threading
 
# ================================================================= #
#                Packing and Unpacking functions                    #
# ================================================================= #
 
def _get_endian_prefix(endian):
    endian = endian.lower()
    if endian in ['little', 'le']: return '<'
    if endian in ['big', 'be']: return '>'
    raise ValueError("Endian must be 'little' or 'big'")
 
def p8(x, *args, **kwargs): return struct.pack('<B', x)
def p32(x, endian='little'): return struct.pack(f'{_get_endian_prefix(endian)}I', x)
def p64(x, endian='little'): return struct.pack(f'{_get_endian_prefix(endian)}Q', x)
def u8(x, *args, **kwargs): return struct.unpack('<B', x)[0]
def u32(x, endian='little'): return struct.unpack(f'{_get_endian_prefix(endian)}I', x)[0]
def u64(x, endian='little'): return struct.unpack(f'{_get_endian_prefix(endian)}Q', x)[0]
 
# ================================================================= #
#                      The Main Pwn Class                           #
# ================================================================= #
 
def remote(host, port):
    try:
        p = Pwn()
        p.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        p.sock.connect((host, port))
        return p
    except Exception as e:
        print(e)
        p.sock = None
        return None
 
class Pwn:
    def __init__(self):
        self.sock = None
        self.log_prefix = {
            'info':    '[*] ',
            'success': '[+] ',
            'error':   '[-] '
        }
        # 用于在多线程交互中同步状态
        self.interactive_stop_event = threading.Event()
     
    def _log(self, message, level='info'):
        print(f"{self.log_prefix.get(level, '')}{message}", flush=True)
         
    def send(self, data):
        if self.sock is None: self._log("Socket is not connected.", 'error'); return
        if isinstance(data, str): data = data.encode('utf-8')
        try:
            self.sock.sendall(data)
        except Exception as e:
            self._log(f"Failed to send data: {e}", 'error'); self.close()
 
    def sendline(self, data):
        if isinstance(data, str): data = data.encode('utf-8')
        self.send(data + b'\n')
 
    def recv(self, bufsize=4096, timeout=2):
        if self.sock is None: self._log("Socket is not connected.", 'error'); return b''
        try:
            self.sock.settimeout(timeout)
            return self.sock.recv(bufsize)
        except socket.timeout: self._log("Receive timed out.", 'info'); return b''
        except Exception as e: self._log(f"Failed to receive data: {e}", 'error'); self.close(); return b''
 
    def recvuntil(self, delims, timeout=2):
        if self.sock is None: self._log("Socket is not connected.", 'error'); return b''
        if isinstance(delims, str): delims = delims.encode('utf-8')
        data = b''
        try:
            self.sock.settimeout(timeout)
            while delims not in data:
                chunk = self.sock.recv(1)
                if not chunk: self._log("Connection closed by remote host.", 'info'); break
                data += chunk
            return data
        except socket.timeout: self._log("recvuntil timed out.", 'info'); return data
        except Exception as e: self._log(f"Failed in recvuntil: {e}", 'error'); self.close(); return b''
 
    def interactive(self):
        if self.sock is None: self._log("Socket is not connected.", 'error'); return
        self._log("Switching to interactive mode.")
        if sys.platform == 'win32':
            self._interactive_windows()
        else:
            self._interactive_linux()
 
    def _interactive_linux(self):
        try:
            while True:
                readable, _, _ = select.select([self.sock, sys.stdin], [], [])
                for s in readable:
                    if s is self.sock:
                        data = self.sock.recv(4096)
                        if not data: self._log("Connection closed by remote host."); return
                        os.write(sys.stdout.fileno(), data)
                    if s is sys.stdin:
                        user_input = os.read(sys.stdin.fileno(), 4096)
                        if not user_input: continue
                        self.sock.sendall(user_input)
        except KeyboardInterrupt: self._log("\nInteractive mode ended by user (Ctrl+C).")
        except Exception as e: self._log(f"\nAn error occurred in interactive mode: {e}", 'error')
        finally: self.close()
 
    def _interactive_windows(self):
        """Interactive mode for Windows using threading with consistent I/O."""
        self.interactive_stop_event.clear()
         
        def receiver():
            while not self.interactive_stop_event.is_set():
                try:
                    # 设置一个小的超时，以便线程可以周期性地检查 stop_event
                    self.sock.settimeout(0.1) 
                    data = self.sock.recv(4096)
                    if not data:
                        self._log("Connection closed by remote host.")
                        break
                    # 使用高层级的 sys.stdout.write
                    sys.stdout.write(data.decode(errors='ignore'))
                    sys.stdout.flush()
                except socket.timeout:
                    continue # 超时是正常的，继续循环
                except (socket.error, OSError) as e:
                    # 如果套接字已关闭，则会出错
                    break
            self.interactive_stop_event.set()
 
        recv_thread = threading.Thread(target=receiver)
        recv_thread.daemon = True
        recv_thread.start()
 
        try:
            while not self.interactive_stop_event.is_set():
                # 使用高层级的 sys.stdin.readline
                user_input = sys.stdin.readline()
                if not user_input or self.interactive_stop_event.is_set():
                    break
                try:
                    self.send(user_input)
                except (socket.error, OSError):
                    break
        except KeyboardInterrupt:
            self._log("\nInteractive mode ended by user (Ctrl+C).")
        except Exception as e:
            if not self.interactive_stop_event.is_set():
                 self._log(f"\nAn error occurred in interactive mode: {e}", 'error')
        finally:
            self.interactive_stop_event.set()
            self.close()
            recv_thread.join(timeout=1.0) # 等待接收线程结束
 
    def close(self):
        if self.sock:
            self.interactive_stop_event.set() # 确保所有交互循环都停止
            try:
                # 关闭读写可以帮助阻塞的recv/send调用立即返回
                self.sock.shutdown(socket.SHUT_RDWR)
            except OSError:
                pass # 如果套接字已经关闭，会抛出OSError
            self.sock.close()
            self.sock = None
            self._log("Connection closed.")
 
# ================================================================= #
#                         Example Usage                             #
# ================================================================= #
 
if __name__ == '__main__':
    print("--- Testing Endianness Packing ---")
    val = 0x11223344
    le_packed = p32(val, endian='little'); print(f"Value 0x{val:x} packed as little-endian: {le_packed} (Hex: {le_packed.hex()})")
    be_packed = p32(val, endian='big'); print(f"Value 0x{val:x} packed as big-endian:    {be_packed} (Hex: {be_packed.hex()})")
    print("-" * 34 + "\n")
 
    p = remote("localhost", 4444)
     
    if p.sock:
        # P.S. `recvuntil` 超时是正常的，如果你的 nc 服务在连接后不主动发送任何带换行符的数据。
        welcome_message = p.recvuntil(b"\n", timeout=0.5)
        if welcome_message:
            print(f"Received from server: {welcome_message.decode(errors='ignore').strip()}")
         
        p.sendline(b"Hello from minipwn!")
        print("Initial message sent!")
         
        p.interactive()
        