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[原创] 自动化提取protobuf结构体
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发表于: 2025-3-11 20:16
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众所周知，国赛非常喜欢在题目中塞进protobuf来????人，所以简单搓了个脚本来梭哈proto
以2024年华北国赛半决赛的proc为例，简单复习一下
程序是个heap菜单题，输入会经过sub_1AA5函数进行处理
这是一个protobuf的反序列化函数，proto的结构体在unk_3C60
简单对应一下，可知name short_name c_name都是unk_2260，即Msg，package_name则为空
其字段内容在values，即off_3B80处
只要把每个字段的name type找到，就可以复原出proto文件了
项目地址在此~
struct ProtobufCEnumDescriptor { /** Magic value checked to ensure that the API is used correctly. */ uint32_t magic; /** The qualified name (e.g., "namespace.Type"). */ const char *name; /** The unqualified name as given in the .proto file (e.g., "Type"). */ const char *short_name; /** Identifier used in generated C code. */ const char *c_name; /** The dot-separated namespace. */ const char *package_name; /** Number elements in `values`. */ unsigned n_values; /** Array of distinct values, sorted by numeric value. */ const ProtobufCEnumValue *values; /** Number of elements in `values_by_name`. */ unsigned n_value_names; /** Array of named values, including aliases, sorted by name. */ const ProtobufCEnumValueIndex *values_by_name; /** Number of elements in `value_ranges`. */ unsigned n_value_ranges; /** Value ranges, for faster lookups by numeric value. */ const ProtobufCIntRange *value_ranges; /** Reserved for future use. */ void *reserved1; /** Reserved for future use. */ void *reserved2; /** Reserved for future use. */ void *reserved3; /** Reserved for future use. */ void *reserved4;};struct ProtobufCEnumDescriptor { /** Magic value checked to ensure that the API is used correctly. */ uint32_t magic; /** The qualified name (e.g., "namespace.Type"). */ const char *name; /** The unqualified name as given in the .proto file (e.g., "Type"). */ const char *short_name; /** Identifier used in generated C code. */ const char *c_name; /** The dot-separated namespace. */ const char *package_name; /** Number elements in `values`. */ unsigned n_values; /** Array of distinct values, sorted by numeric value. */ const ProtobufCEnumValue *values; /** Number of elements in `values_by_name`. */ unsigned n_value_names; /** Array of named values, including aliases, sorted by name. */ const ProtobufCEnumValueIndex *values_by_name; /** Number of elements in `value_ranges`. */ unsigned n_value_ranges; /** Value ranges, for faster lookups by numeric value. */ const ProtobufCIntRange *value_ranges; /** Reserved for future use. */ void *reserved1; /** Reserved for future use. */ void *reserved2; /** Reserved for future use. */ void *reserved3; /** Reserved for future use. */ void *reserved4;};struct ProtobufCFieldDescriptor { /** Name of the field as given in the .proto file. */ const char *name; /** Tag value of the field as given in the .proto file. */ uint32_t id; /** Whether the field is `REQUIRED`, `OPTIONAL`, or `REPEATED`. */ ProtobufCLabel label; /** The type of the field. */ ProtobufCType type; /** * The offset in bytes of the message's C structure's quantifier field * (the `has_MEMBER` field for optional members or the `n_MEMBER` field * for repeated members or the case enum for oneofs). */ unsigned quantifier_offset; /** * The offset in bytes into the message's C structure for the member * itself. */ unsigned offset; /** * A type-specific descriptor. * * If `type` is `PROTOBUF_C_TYPE_ENUM`, then `descriptor` points to the * corresponding `ProtobufCEnumDescriptor`. * * If `type` is `PROTOBUF_C_TYPE_MESSAGE`, then `descriptor` points to * the corresponding `ProtobufCMessageDescriptor`. * * Otherwise this field is NULL. */ const void *descriptor; /* for MESSAGE and ENUM types */ /** The default value for this field, if defined. May be NULL. */ const void *default_value; /** * A flag word. Zero or more of the bits defined in the * `ProtobufCFieldFlag` enum may be set. */ uint32_t flags; /** Reserved for future use. */ unsigned reserved_flags; /** Reserved for future use. */ void *reserved2; /** Reserved for future use. */ void *reserved3;};struct ProtobufCFieldDescriptor { /** Name of the field as given in the .proto file. */ const char *name; /** Tag value of the field as given in the .proto file. */ uint32_t id; /** Whether the field is `REQUIRED`, `OPTIONAL`, or `REPEATED`. */[培训]内核驱动高级班，冲击BAT一流互联网大厂工作，每周日13:00-18:00直播授课
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