c++でズンドコゲッター

概要

C++でズンドコゲッターやってみた。

実際

サンプルコード

# include <stdio.h>
# include <sys/socket.h>
# include <arpa/inet.h>
# include <stdlib.h>
# include <unistd.h>
# include <netdb.h>
# include <string.h>
# include <iostream>
using namespace std;

int create_tcp_socket();
char * get_ip(char * host);
char * build_get_query(char * host, char * page);
# define PORT        80
# define USERAGENT   "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"
string zundoko()
{
    struct sockaddr_in * remote;
    int sock;
    int tmpres;
    char * ip;
    char * get;
    char buf[BUFSIZ + 1];
    char * host = "ohijs0.paas.jp-e1.cloudn-service.com";
    char * page = "/zundoko";
    sock = create_tcp_socket();
    ip = get_ip(host);
    remote = (struct sockaddr_in *) malloc(sizeof(struct sockaddr_in *));
    remote->sin_family = AF_INET;
    tmpres = inet_pton(AF_INET, ip, (void *) (&(remote->sin_addr.s_addr)));
    if (tmpres < 0)
    {
        perror("Can't set remote->sin_addr.s_addr");
        exit(1);
    }
    else if (tmpres == 0)
    {
        fprintf(stderr, "%s is not a valid IP address\n", ip);
        exit(1);
    }
    remote->sin_port = htons(PORT);
    if (connect(sock, (struct sockaddr *) remote, sizeof(struct sockaddr)) < 0)
    {
        perror("Could not connect");
        exit(1);
    }
    get = build_get_query(host, page);
    int sent = 0;
    while (sent < strlen(get))
    {
        tmpres = send(sock, get + sent, strlen(get) - sent, 0);
        if (tmpres == -1)
        {
            perror("Can't send query");
            exit(1);
        }
        sent += tmpres;
    }
    memset(buf, 0, sizeof(buf));
    int htmlstart = 0;
    char * htmlcontent;
    while ((tmpres = recv(sock, buf, BUFSIZ, 0)) > 0)
    {
        if (htmlstart == 0)
        {
            htmlcontent = strstr(buf, "\r\n\r\n");
            if (htmlcontent != NULL)
            {
                htmlstart = 1;
                htmlcontent += 4;
            }
        }
        else
        {
            htmlcontent = buf;
        }
        memset(buf, 0, tmpres);
    }
    if (tmpres < 0)
    {
        perror("Error receiving data");
    }
    free(get);
    free(remote);
    free(ip);
    close(sock);
    return htmlcontent;
}
int create_tcp_socket()
{
    int sock;
    if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
    {
        perror("Can't create TCP socket");
        exit(1);
    }
    return sock;
}
char * get_ip(char * host)
{
    struct hostent * hent;
    int iplen = 15;
    char * ip = (char *) malloc(iplen + 1);
    memset(ip, 0, iplen + 1);
    if ((hent = gethostbyname(host)) == NULL)
    {
        herror("Can't get IP");
        exit(1);
    }
    if (inet_ntop(AF_INET, (void *) hent->h_addr_list[0], ip, iplen) == NULL)
    {
        perror("Can't resolve host");
        exit(1);
    }
    return ip;
}
char * build_get_query(char * host, char * page)
{
    char * query;
    char * getpage = page;
    char * tpl = "GET /%s HTTP/1.0\r\nHost: %s\r\nUser-Agent: %s\r\n\r\n";
    if (getpage[0] == '/')
    {
        getpage = getpage + 1;
    }
    query = (char *) malloc(strlen(host) + strlen(getpage) + strlen(USERAGENT) + strlen(tpl) - 5);
    sprintf(query, tpl, getpage, host, USERAGENT);
    return query;
}
int main()
{
    int z = 0;
    int c = 0;
    string s;
    do 
    {
        z = c ? (z + 1) : 0;
        s = zundoko();
        if (s == "ズン") c = 1;
        else c = 0;
        c = (rand() >> 3) & 1;
        printf("%s ", c ? "ズン" : "ドコ");
    } while (z < 4 || c);
    printf("キ・ヨ・シ!");
}