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/*
*
* Stripped code sample to test a bug
* Files: 1
* - main.cpp
*
*/
/*
The program hangs at freeaddrinfo about 50% of the time
The program crashes at freeaddrinfo about 40% of the time
The program runs successfully 10% of the time
Tested on Windows 7(64-bit), compiled with minGW
*/
/*
Compilescript: Notepad++
SET g++ = C:\Dev-Cpp\bin\g++.exe
SET obj = $(CURRENT_DIRECTORY)\$(NAME_PART)
"$(g++)" -c "$(FULL_CURRENT_PATH)" -o "$(obj).o"
"$(g++)" "$(obj).o" -lalleg -lkernel32 C:/Dev-Cpp/lib/libws2_32.a -luser32 -lgdi32 -lcomdlg32 -lole32 -ldinput -lddraw -ldxguid -lwinmm -ldsound -o "$(obj).exe"
UNSET obj
UNSET g++
*/
#include <windows.h>
#include <stdio.h>
#include <Ws2tcpip.h>
void error(char* szExitMessage);
SOCKET connectWalk(struct addrinfo* ai_SocketInfo);
int tcpConnect(char* host, char* port, SOCKET* connection);
using namespace std;
int main(){
//Initialize WSAData
int nStatus = 0;
WSADATA wsadata;
printf("Starting WSAData...\r\n");
nStatus = WSAStartup(MAKEWORD(2,2),&wsadata);
if(nStatus != NO_ERROR){
error("Error at WSAData\r\n");
}
//Connect part
char* szHost = "www.google.no";
char* szPort = "80";
SOCKET sDownloadSock;
nStatus = tcpConnect(szHost, szPort, &sDownloadSock);
printf("Connected Successfully, lets try to send something.");
char szTest[512] = "";
sprintf(szTest, "GET /%s HTTP/1.1\r\nHost: %s\r\n\r\n", "", szHost);
nStatus = send(sDownloadSock, szTest, strlen(szTest), 0);
printf("Debugging: \r\n\tsend() / nStatus = %d\r\n\tWSAGetLastError() = %d\r\n", nStatus, WSAGetLastError());
error("Success!");
}
void error(char* szExitMessage){
printf("%s\r\n", szExitMessage);
system("pause");
exit(1);
}
int tcpConnect(char* host, char* port, SOCKET* connection){
printf("tcpConnect: Connecting to host: %s:%s.\r\n", host, port);
int status;
struct addrinfo setupInfo, *tempDeleter;
struct addrinfo* retInfo;
tempDeleter = &setupInfo;
memset(&setupInfo, 0, sizeof(setupInfo));
setupInfo.ai_family = AF_UNSPEC;
setupInfo.ai_socktype = SOCK_STREAM;
setupInfo.ai_flags = AI_PASSIVE;
status = getaddrinfo(host, port, &setupInfo, &retInfo);
if(status != 0){
printf("Failed @ getaddrinfo![%d//%d]", status, WSAGetLastError());
freeaddrinfo(&setupInfo);
freeaddrinfo(retInfo);
*connection = INVALID_SOCKET;
error("failed after getaddrinfo");
}
*connection = connectWalk(retInfo);
printf("freeing addrinfo's\r\n");
//This is where the program hangs
// It starts hanging here about 50% of the time.
freeaddrinfo(retInfo);
freeaddrinfo(tempDeleter);
//end of crash place 1
printf("freeaddrinfo() done, tcpConnect done.");
if(*connection == INVALID_SOCKET){
error("Failed when connecting to socket");
closesocket(*connection);
*connection = INVALID_SOCKET;
return 1;
}
return 0;
}
SOCKET connectWalk(struct addrinfo* ai_SocketInfo){
struct addrinfo* tryInfo;
SOCKET retSock;
for(tryInfo = ai_SocketInfo; tryInfo != NULL; tryInfo = tryInfo->ai_next){ //walk through sockets and connect to first available one
if((retSock = socket(tryInfo->ai_family, tryInfo->ai_socktype, tryInfo->ai_protocol)) == -1){
#ifdef PRINTSOCKERRORS
log("WALKERROR: socket");
#endif
continue;
}
if(connect(retSock, tryInfo->ai_addr, tryInfo->ai_addrlen) == -1){
closesocket(retSock);
#ifdef PRINTSOCKERRORS
log("WALKERROR: @connect\r\n");
#endif
continue;
}
break;
}
if(tryInfo == NULL){
closesocket(retSock);
#ifdef PRINTSOCKERRORS
log("WALKERROR: could not connect!");
#endif
freeaddrinfo(ai_SocketInfo);
return INVALID_SOCKET;
}
freeaddrinfo(ai_SocketInfo);
return retSock;
}
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