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如何使用PHPEmbedSAPI实现Opcodes查看器，sapiopcodes_PHP教程

时间：2021-07-01 10:21:17 帮助过：18人阅读

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：

  1. #include "sapi/embed/php_embed.h"
  2. int main(int argc, char * argv[]){
  3.  PHP_EMBED_START_BLOCK(argc,argv);
  4.  char * script = " print 'Hello World!';";
  5.  zend_eval_string(script, NULL,
  6.           "Simple Hello World App" TSRMLS_CC);
  7.  PHP_EMBED_END_BLOCK();
  8.  return 0;
  9. }

然后就是要指明include path了，一个简单的Makefile

  1. CC = gcc
  2. CFLAGS = -I/usr/local/include/php/ \
  3.    -I/usr/local/include/php/main \
  4.    -I/usr/local/include/php/Zend \
  5.    -I/usr/local/include/php/TSRM \
  6.    -Wall -g
  7. LDFLAGS = -lstdc++ -L/usr/local/lib -lphp5
  8. ALL:
  9.  $(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）；

  1. char *opname(zend_uchar opcode){
  2.  switch(opcode) {
  3.   case ZEND_NOP: return "ZEND_NOP"; break;
  4.   case ZEND_ADD: return "ZEND_ADD"; break;
  5.   case ZEND_SUB: return "ZEND_SUB"; break;
  6.   case ZEND_MUL: return "ZEND_MUL"; break;
  7.   case ZEND_DIV: return "ZEND_DIV"; break;
  8.   case ZEND_MOD: return "ZEND_MOD"; break;
  9.   case ZEND_SL: return "ZEND_SL"; break;
  10.   case ZEND_SR: return "ZEND_SR"; break;
  11.   case ZEND_CONCAT: return "ZEND_CONCAT"; break;
  12.   case ZEND_BW_OR: return "ZEND_BW_OR"; break;
  13.   case ZEND_BW_AND: return "ZEND_BW_AND"; break;
  14.   case ZEND_BW_XOR: return "ZEND_BW_XOR"; break;
  15.   case ZEND_BW_NOT: return "ZEND_BW_NOT"; break;
  16.   /*...省略 ....*/
  17.   default : return "UNKNOW"; break;

然后定义zval和znode的输出函数：

  1.  char *format_zval(zval *z)
  2. {
  3.  static char buffer[BUFFER_LEN];
  4.  int len;
  5.  switch(z->type) {
  6.   case IS_NULL:
  7.    return "NULL";
  8.   case IS_LONG:
  9.   case IS_BOOL:
  10.    snprintf(buffer, BUFFER_LEN, "%d", z->value.lval);
  11.    return buffer;
  12.   case IS_DOUBLE:
  13.    snprintf(buffer, BUFFER_LEN, "%f", z->value.dval);
  14.    return buffer;
  15.   case IS_STRING:
  16.    snprintf(buffer, BUFFER_LEN, "\"%s\"", z->value.str.val);
  17.    return buffer;
  18.   case IS_ARRAY:
  19.   case IS_OBJECT:
  20.   case IS_RESOURCE:
  21.   case IS_CONSTANT:
  22.   case IS_CONSTANT_ARRAY:
  23.    return "";
  24.   default:
  25.    return "unknown";
  26.  }
  27. }
  28. char * format_znode(znode *n){
  29.  static char buffer[BUFFER_LEN];
  30.  switch (n->op_type) {
  31.   case IS_CONST:
  32.    return format_zval(&n->u.constant);
  33.    break;
  34.   case IS_VAR:
  35.    snprintf(buffer, BUFFER_LEN, "$%d", n->u.var/sizeof(temp_variable));
  36.    return buffer;
  37.    break;
  38.   case IS_TMP_VAR:
  39.    snprintf(buffer, BUFFER_LEN, "~%d", n->u.var/sizeof(temp_variable));
  40.    return buffer;
  41.    break;
  42.   default:
  43.    return "";
  44.    break;
  45.  }
  46. }

然后定义op_array的输出函数：

  1. void dump_op(zend_op *op, int num){
  2.  printf("%5d %5d %30s %040s %040s %040s\n", num, op->lineno,
  3.    opname(op->opcode),
  4.    format_znode(&op->op1),
  5.    format_znode(&op->op2),
  6.    format_znode(&op->result)) ;
  7. }
  8. void dump_op_array(zend_op_array *op_array){
  9.  if(op_array) {
  10.   int i;
  11.   printf("%5s %5s %30s %040s %040s %040s\n", "opnum", "line", "opcode", "op1", "op2", "result");
  12.   for(i = 0; i < op_array->last; i++) {
  13.    dump_op(&op_array->opcodes[i], i);
  14.   }
  15.  }
  16. }

最后，就是程序的主函数了：

  1. int main(int argc, char **argv){
  2.  zend_op_array *op_array;
  3.  zend_file_handle file_handle;
  4.  if(argc != 2) {
  5.   printf("usage: op_dumper 
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  19.                 <label class="ui-label"> </label>
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  26.   </form>
  27. </div>
  28. <form id="regform" action="/user-center-reg.html" method="post">
  29. <div class="login-reg" style="display: none;" id="con_login_2">
  30. <input type="hidden" name="t" id="t">
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  48.  </form>
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