我们在pub/sub代理实现中使用boost/rapidxml进行XML解析,对于某个XML有效负载,代理崩溃了.
为了消除尽可能多的变量,我实现了一个只执行XML解析的简短测试程序,崩溃类似.
我的简短测试程序在这里找到:
#include// printf #include // read #include // open #include // open #include // open #include // errno #include // strerror #include "rapidxml.hpp" #ifdef LONG_RAPIDXML_NAME_SPACE // boost version >= 1.45 using namespace boost::property_tree::detail::rapidxml; #else // boost version <= 1.44 using namespace rapidxml; #endif /* **************************************************************************** * * xmlTreePresent - */ static void xmlTreePresent(xml_node<>* nodeP, std::string indent, int depth = 0) { static int callNo = 0; ++callNo; if(nodeP == NULL) { printf("%sNULL NODE\n", indent.c_str()); } char* name = nodeP->name(); char* value = nodeP->value(); printf("%s%s (%s) (call %d, depth %d)\n", indent.c_str(), name, value, callNo, depth); xml_node<>* child = nodeP->first_node(); while(child != NULL) { printf("%schild at %p\n", indent.c_str(), child); printf("%schild->name() at %p\n", indent.c_str(), child->name()); if((child->name() != NULL) && (child->name()[0] != 0)) { xmlTreePresent(child, indent + " ", depth + 1); } child = child->next_sibling(); } } /* **************************************************************************** * * xmlDocPrepare - */ static xml_node<>* xmlDocPrepare(char* xml) { xml_document<> doc; try { doc.parse<0>(xml); } catch(parse_error& e) { printf("PARSE ERROR: %s\n", e.what()); return NULL; } catch(...) { printf("GENERIC ERROR during doc.parse\n"); return NULL; } xml_node<>* father = doc.first_node(); return father; } /* **************************************************************************** * * main - */ int main(int argC, char* argV[]) { char* fileName = argV[1]; int fd; if((fd = open(fileName, O_RDONLY)) == -1) { printf("open('%s'): %s", fileName, strerror(errno)); exit(1); } struct stat statBuf; if(stat(fileName, &statBuf) != 0) { printf("stat('%s'): %s", fileName, strerror(errno)); exit(2); } char* buf = (char*) calloc(1, statBuf.st_size + 1); if(buf == NULL) { printf("calloc(%lu): %s", statBuf.st_size + 1, strerror(errno)); exit(3); } int nb = read(fd, buf, statBuf.st_size); if(nb == -1) { printf("read('%s'): %s", fileName, strerror(errno)); exit(4); } else if(nb != statBuf.st_size) { printf("read %d characters, wanted %lu", nb, statBuf.st_size); exit(5); } xml_node<>* father = xmlDocPrepare((char*) buf); xmlTreePresent(father, ""); return 0; }
这里有一个示例输入XML:http://pastebin.com/rYiDjP7E
我在Ubuntu(libboost_serialization.so.1.49.0)和CentOS(libboost_serialization.so.5)中都试过了,我遇到了类似的崩溃.
[我不确定,但我认为boost属性树驻留在序列化库中......]
它在CentOS中稍微进一步,但在类似的崩溃中结束.
感谢这里的帮助,我们让用户等待修复......
首先.
> OMG <那里有相当多的代码 - 很遗憾地说,或许直言不讳.
这不是c ++!更换你的整个main使用
int main(int argc, char* argv[])
{
std::ifstream ifs(argc>1? argv[1] : "input.txt");
std::string buf(std::istreambuf_iterator(ifs), {});
xml_node<>* father = xmlDocPrepare(&buf[0]);
xmlTreePresent(father, "");
}
rapidxml不是Boost的一部分.它在Boost属性树中使用(实现细节)
Boost Property Tree是它自己的库,与Boost Serialization无关(这意味着您不必链接到共享库)
真正的错误在这里:
static xml_node<>* xmlDocPrepare(char* xml)
{
xml_document<> doc;
..
xml_node<>* father = doc.first_node();
return father;
}
这将返回对(into)本地的引用,但local(doc)不存在于return语句之外!我将修复此实例如下:
int main(int argc, char* argv[])
{
std::ifstream ifs(argc>1? argv[1] : "input.txt");
std::string xml(std::istreambuf_iterator(ifs), {});
try
{
xml_document<> doc;
doc.parse<0>(&xml[0]);
xmlTreePresent(doc.first_node());
return 0;
}
catch(parse_error& e) { printf("PARSE ERROR: %s\n", e.what()); }
catch(...) { printf("GENERIC ERROR during doc.parse\n"); }
return 1;
}
请注意我如何将76行代码减少到17 :)并减少内存泄漏.
更新这里是一个完全清理的版本--HURRAY - c ++而不是C:看到Live On Coliru,它可以看到解析样本XML,但删除了可忽略的空格,这样你就可以更好地看到输出.
当然,它也适用于'漂亮'的xml.
#include#include #include #include using namespace boost::property_tree::detail::rapidxml; static void xmlTreePresent(xml_node<> const* nodeP, int depth = 0) { static int callNo = 0; callNo += 1; if(nodeP) { std::cout << std::setw(depth*2) << "" << nodeP->name()/* << " (" << nodeP->value() << ") (call " << callNo << ", depth " << depth << ")" */ << "\n"; for (xml_node<>* child = nodeP->first_node(); child; child = child->next_sibling()) { auto name = child->name(); if(name && name[0]) { xmlTreePresent(child, depth + 1); } } } else { std::cout << std::setw(depth*2) << "" << "NULL NODE\n"; } } int main(int argc, char* argv[]) { std::ifstream ifs(argc>1? argv[1] : "input.txt"); std::string xml(std::istreambuf_iterator (ifs), {}); try { xml_document<> doc; doc.parse<0>(&xml[0]); xmlTreePresent(doc.first_node()); return 0; } catch(parse_error& e) { printf("PARSE ERROR: %s\n", e.what()); } catch(...) { printf("GENERIC ERROR during doc.parse\n"); } return 1; }
这是删除了调试信息的输出(如/ comment /中所示):
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