Question

我的代码有问题，变量receiver_buffer从json_packet或函数external_auth_format_packet中的uu获取一些数据。

您可以在日志中看到：

Sep 26 12:35:07 ubuntu sshd[58912]: userauth_external: DEBUG: socket_path: /tmp/auth.sock
Sep 26 12:35:07 ubuntu sshd[58912]: userauth_external: DEBUG: json_packet: {"user": "root", "key": "AAAAB3NzaC1yc2EAAAADAQABAAABAQDwHDG/TpoUDts9CFrUWh6eoOlPcQYTLIpkF1udDaRZMsdZSZyDsWO5otqrUiQuVLFBXKa4CMiYBJIll2Ye/ZMWjbWd6mkrhE/u4Ha+DS6wyoza3mgn4ekDYxHqzk6/9kVnNtdh+sw3h0OwhkJJG/fAGzGFZhaV5bRS8f9u6pxIKTdmUfozkfe/QhYlFS9gaFnlK2rn8efK1oeNL00YBEcFLVeFdFqU9xuTOrHIQuOHxEynF/zekJ69D1MDhLZDhzq7mfy00wOnS51Q0gxZUdBiFr0ahuD/WrxKgwYunAsp1hD22+WU89vmoPtonWE7a6hTeZtz6Mb0YPfmRwz+CaR1", "type": "ssh-rsa"}
Sep 26 12:35:07 ubuntu sshd[58912]: userauth_external: DEBUG: sent json_packet to server
Sep 26 12:35:07 ubuntu sshd[58912]: userauth_external: DEBUG: receiver_buffer memory allocation
Sep 26 12:35:07 ubuntu sshd[58912]: userauth_external: DEBUG: recv has received: {"status":1,"command":"command='./gitserve' "}
Sep 26 12:35:07 ubuntu sshd[58912]: userauth_external: DEBUG: copying from tmp_buffer to receiver_buffer
Sep 26 12:35:07 ubuntu sshd[58912]: userauth_external: DEBUG: finished receiving data from socket
Sep 26 12:35:07 ubuntu sshd[58912]: error: userauth_external: ERROR: Unable to load parmaters! error: on line 1: end of file expected near 'rUWh'\n
Sep 26 12:35:07 ubuntu sshd[58912]: error: userauth_external: ERROR: response {"status":1,"command":"command='./gitserve' "}rUWh6eoOlPcQYTLIpkF1udDaRZMsdZSZyDsWO5otqrUiQuVLFBXKa4CMiYBJIll2Ye/ZMWjbWd6mkrhE/u4Ha+DS6wyoza3mgn4ekDYxHqzk6/9kVnNtdh+sw3h0OwhkJJG/fAGzGFZhaV5bRS8f9u6pxIKTdmUfozkfe/QhYlFS9gaFnlK2rn8efK1oeNL00YBEcFLVeFdFqU9xuTOrHIQuOHxEynF/zekJ69D1MDhLZDhzq7mfy00wOnS51Q0gxZUdBiFr0ahuD/WrxKgwYunAsp1hD22+WU89vmoPtonWE7a6hTeZtz6Mb0YPfmRwz+CaR1

来自套接字receiver_buffer接收数据

{"status":1,"command":"command='./gitserve' "}

然后jansson尝试解析它看作不属于该变量的数据的数据

{"status":1,"command":"command='./gitserve' "}rUWh6eoOlPcQYTLIpkF1udDaRZMsdZSZyDsWO5otqrUiQuVLFBXKa4CMiYBJIll2Ye/ZMWjbWd6mkrhE/u4Ha+DS6wyoza3mgn4ekDYxHqzk6/9kVnNtdh+sw3h0OwhkJJG/fAGzGFZhaV5bRS8f9u6pxIKTdmUfozkfe/QhYlFS9gaFnlK2rn8efK1oeNL00YBEcFLVeFdFqU9xuTOrHIQuOHxEynF/zekJ69D1MDhLZDhzq7mfy00wOnS51Q0gxZUdBiFr0ahuD/WrxKgwYunAsp1hD22+WU89vmoPtonWE7a6hTeZtz6Mb0YPfmRwz+CaR1`

该函数的源代码 http://pastebin.com/P7WnhsqX

Answer 1

memcpy(receiver_buffer + total_received_chars, tmp_buffer, received_chars);

您正在复制received_chars字节，这是字符串长度 - 它不包括终止'\ 0'字节。之后，当你尝试使用它时 - 你有你的字符串+缓冲区的其余部分，因为你不知道你需要阅读多少。

C变量和内存问题

1 个答案: