如何使用PHP Embed SAPI实现Opcodes查看器,sapiopcodes
如何使用PHP Embed SAPI实现Opcodes查看器,sapiopcodes
PHP提供了一个Embed SAPI,也就是说,PHP容许你在C/C++语言中调用PHP/ZE提供的函数。本文就通过基于Embed SAPI实现一个PHP的opcodes查看器。
首先,下载PHP源码以供编译, 我现在使用的是PHP5.3 alpha2
进入源码目录:
./configure --enable-embed --with-config-file-scan-dir=/etc/php.d --with-mysql --with-config-file-path=/etc/
./make
./make install
最后,记得要将生成的libphp5.so复制到运行时库的目录,我直接拷贝到了/lib/, 否则会在运行你自己的embed程序的时候报错:
./embed: error while loading shared libraries: libphp5.so: cannot open shared object file: No such file or directory
如果你对PHP的SAPI还不熟悉的话,我建议你看看我的这篇文章:深入理解Zend SAPIs(Zend SAPI Internals)
这个时候,你就可以在你的C代码中,嵌入PHP脚本解析器了, 我的例子:
#include "sapi/embed/php_embed.h" int main(int argc, char * argv[]){ PHP_EMBED_START_BLOCK(argc,argv); char * script = " print 'Hello World!';"; zend_eval_string(script, NULL, "Simple Hello World App" TSRMLS_CC); PHP_EMBED_END_BLOCK(); return 0; }
然后就是要指明include path了,一个简单的Makefile
CC = gcc CFLAGS = -I/usr/local/include/php/ \ -I/usr/local/include/php/main \ -I/usr/local/include/php/Zend \ -I/usr/local/include/php/TSRM \ -Wall -g LDFLAGS = -lstdc++ -L/usr/local/lib -lphp5 ALL: $(CC) -o embed embed.cpp $(CFLAGS) $(LDFLAGS)
编译成功以后, 运行,我们可以看到, stdout输出 Hello World!
基于这个,我们就可以很容易的实现一个类似于vld的Opcodes dumper:
首先我们定义opcode的转换函数(全部的opcodes可以查看Zend/zend_vm_opcodes.h);
char *opname(zend_uchar opcode){ switch(opcode) { case ZEND_NOP: return "ZEND_NOP"; break; case ZEND_ADD: return "ZEND_ADD"; break; case ZEND_SUB: return "ZEND_SUB"; break; case ZEND_MUL: return "ZEND_MUL"; break; case ZEND_DIV: return "ZEND_DIV"; break; case ZEND_MOD: return "ZEND_MOD"; break; case ZEND_SL: return "ZEND_SL"; break; case ZEND_SR: return "ZEND_SR"; break; case ZEND_CONCAT: return "ZEND_CONCAT"; break; case ZEND_BW_OR: return "ZEND_BW_OR"; break; case ZEND_BW_AND: return "ZEND_BW_AND"; break; case ZEND_BW_XOR: return "ZEND_BW_XOR"; break; case ZEND_BW_NOT: return "ZEND_BW_NOT"; break; /*...省略 ....*/ default : return "UNKNOW"; break;
然后定义zval和znode的输出函数:
char *format_zval(zval *z) { static char buffer[BUFFER_LEN]; int len; switch(z->type) { case IS_NULL: return "NULL"; case IS_LONG: case IS_BOOL: snprintf(buffer, BUFFER_LEN, "%d", z->value.lval); return buffer; case IS_DOUBLE: snprintf(buffer, BUFFER_LEN, "%f", z->value.dval); return buffer; case IS_STRING: snprintf(buffer, BUFFER_LEN, "\"%s\"", z->value.str.val); return buffer; case IS_ARRAY: case IS_OBJECT: case IS_RESOURCE: case IS_CONSTANT: case IS_CONSTANT_ARRAY: return ""; default: return "unknown"; } } char * format_znode(znode *n){ static char buffer[BUFFER_LEN]; switch (n->op_type) { case IS_CONST: return format_zval(&n->u.constant); break; case IS_VAR: snprintf(buffer, BUFFER_LEN, "$%d", n->u.var/sizeof(temp_variable)); return buffer; break; case IS_TMP_VAR: snprintf(buffer, BUFFER_LEN, "~%d", n->u.var/sizeof(temp_variable)); return buffer; break; default: return ""; break; } }
然后定义op_array的输出函数:
void dump_op(zend_op *op, int num){ printf("%5d %5d %30s %040s %040s %040s\n", num, op->lineno, opname(op->opcode), format_znode(&op->op1), format_znode(&op->op2), format_znode(&op->result)) ; } void dump_op_array(zend_op_array *op_array){ if(op_array) { int i; printf("%5s %5s %30s %040s %040s %040s\n", "opnum", "line", "opcode", "op1", "op2", "result"); for(i = 0; i last; i++) { dump_op(&op_array->opcodes[i], i); } } }
最后,就是程序的主函数了:
int main(int argc, char **argv){ zend_op_array *op_array; zend_file_handle file_handle; if(argc != 2) { printf("usage: op_dumper
编译,运行测试脚本(sample.php):
复制代码 代码如下:
sample.php:
echo "laruence";
命令:
复制代码 代码如下:
./opcodes_dumper sample.php
得到输出结果(如果你对下面的结果很迷惑,那么建议你再看看我的这篇文章:深入理解PHP原理之Opcodes):
Script: sample.php
opnum line opcode op1 op2 result
0 2 ZEND_ECHO "laruence"
1 4 ZEND_RETURN 1
呵呵,怎么样,是不是很好玩呢?
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