c - Fatal Error Assertation Failure when using _write with winsock and buffer

Question

--Answered now through comment, thanks to all who helped out--

Apologies in advance for my lack of knowledge, C isn't my strong suit. I've been working with the Windows Socket API quite a bit recently in my windows networking class. I've set up a server network where I can (in theory) connect to my other devices using winsock, provided they give authorization through the use of another program. Once authorized, I have this server program that I can use to connect and work with my machine. However, I've run into a problem that I simply cannot seem to solve. Every time I run this program, it seems to connect properly (displaying the Shell line, through this has a warning attached to it), but hits the _write line and fails. Here is a list of things I've considered/tried using to fix it:

1. The int(main) function exceeds the stack size, though I'm unsure if this would effect the _write function.
2. The printf("* Shell#%~$: ", inet_ntoa(client_address.sin_addr)); line is supposed to look like a linux command line and display the address of my machine. However, the compiler generates C6271 the function doesn't work properly.
3. I've been told that this could be due to sizeof(buffer) always returning 1 because it is a char with size 1024, but changing this didn't seem to have any effect.

#include <stdio.h>
#include <sys/types.h>
#include <winsock2.h>
#include <stdlib.h>
#include <string.h>
#include <io.h>
#include <ws2tcpip.h>
#include <winerror.h>
#pragma comment(lib, "ws2_32.lib")
#define bzero(p, size) (void) memset((p), 0, (size))

int main()
{
    WSADATA wsaData;
    WSAStartup(2.2, &wsaData);
    int sock, client_socket;
    char buffer [1024];
    char response[18384];
    struct sockaddr_in server_address, client_address;
    int i = 0;
    int optval = 1;
    socklen_t client_length;
    sock = socket(AF_INET, SOCK_STREAM, 0);

    if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)) < 0)
    {
        wchar_t* s = NULL;
        FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, WSAGetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPWSTR)&s, 0, NULL);
        fprintf(stderr, "%S
", s);
        LocalFree(s);
        printf("Error Setting TCP Socket Options!
");
        return 1;
    }

    server_address.sin_family = AF_INET;
    server_address.sin_addr.s_addr = inet_addr("70.69.238.0");
    server_address.sin_port = htons(50005);

    bind(sock, (struct sockaddr*)&server_address, sizeof(server_address));
    listen(sock, 5);
    client_length = sizeof(client_address);
    client_socket = accept(sock, (struct sockaddr*)&client_address, &client_length);

    while (1)
    {
    jump:
        bzero(&buffer, sizeof(buffer));
        bzero(&response, sizeof(response));
        printf("* Shell#%s~$: ", inet_ntoa(client_address.sin_addr));
        fgets(buffer, sizeof(buffer), stdin);
        strtok(buffer, "
");
        _write(client_socket, buffer, sizeof(buffer));
        if (strcmp("q", buffer, 1) == 0)
        {
            closesocket(sock);
            WSACleanup();
            exit(0);
            break;
        }
        else
        {
            recv(client_socket, response, sizeof(response), MSG_WAITALL);
            printf("%s", response);
        }
    }
}

Debug Output

File: minkernelcrtsucrtsrcappcrtlowiowrite.cpp Line: 49

Expression: (fh >= 0 && (unsigned)fh < (unsigned)_nhandle)

For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts.

(Press Retry to debug the application)

Any help would be greatly appreciated, and if anything else is needed to make it more clear, I can always submit it.

Answer 1

等待大神答复