/usr/share/doc/HOWTO/ja-html/Virtual-Services-HOWTO-3.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<HTML>
<HEAD>
 <META NAME="GENERATOR" CONTENT="SGML-Tools 1.0.9">
 <TITLE>Virtual Services Howto: ¥Ð¡¼¥Á¥ã¥ë¥Ç¡¼¥â¥ó(virtuald)</TITLE>
 <LINK HREF="Virtual-Services-HOWTO-4.html" REL=next>
 <LINK HREF="Virtual-Services-HOWTO-2.html" REL=previous>
 <LINK HREF="Virtual-Services-HOWTO.html#toc3" REL=contents>
</HEAD>
<BODY>
<A HREF="Virtual-Services-HOWTO-4.html">¼¡¤Î¥Ú¡¼¥¸</A>
<A HREF="Virtual-Services-HOWTO-2.html">Á°¤Î¥Ú¡¼¥¸</A>
<A HREF="Virtual-Services-HOWTO.html#toc3">ÌÜ¼¡¤Ø</A>
<HR>
<H2><A NAME="s3">3. ¥Ð¡¼¥Á¥ã¥ë¥Ç¡¼¥â¥ó(virtuald)</A></H2>

<H2><A NAME="ss3.1">3.1 ¤É¤Î¤è¤¦¤ÊÆ°ºî¤ò¤¹¤ë¤«</A>
</H2>

<P>¥Í¥Ã¥È¥ï¡¼¥¯ÀÜÂ³¤Ï&quot;IP¥¢¥É¥ì¥¹&quot;¤È&quot;¥Ý¡¼¥ÈÈÖ¹æ&quot;¤Î¥Ú¥¢
¤«¤é¤Ê¤Ã¤Æ¤¤¤Þ¤¹¡£¥Í¥Ã¥È¥ï¡¼¥¯¥×¥í¥°¥é¥ß¥ó¥°¤ÎAPI(Applications Program 
Interface)¤Ï<CODE>sockets api</CODE>¤È¸Æ¤Ð¤ì¤Þ¤¹¡£¥½¥±¥Ã¥È¤Ï³«¤¤¤¿¥Õ¥¡¥¤¥ë¤Î¤è¤¦¤Ë
¿¶Éñ¤¤¡¢¤³¤ì¤ËÂÐ¤¹¤ëÆÉ¤ß½ñ¤¤ò¤¹¤ë¤³¤È¤Ç¥Í¥Ã¥È¥ï¡¼¥¯·ÐÍ³¤Ç¥Ç¡¼¥¿¤ò¤ä¤ê¤È¤ê
¤¬¤Ç¤¤Þ¤¹¡£
<P>¥í¡¼¥«¥ë¥½¥±¥Ã¥È¤ÎIP¥¢¥É¥ì¥¹¤òÊÖ¤¹¥Õ¥¡¥ó¥¯¥·¥ç¥ó¥³¡¼¥ë<CODE>getsockname</CODE>
¤¬¤¢¤ê¤Þ¤¹¡£
<P>virtuald¤Ï<CODE>getsockname</CODE>(ÌõÃí¡§<CODE>/lib/libc.so</CODE>)¤ò¡¢
¤É¤Î¥í¡¼¥«¥ë¥Þ¥·¥ó¤ÎIP¤¬¥¢¥¯¥»¥¹¤µ¤ì¤Æ¤¤¤ë¤«¤ò·è¤á¤ë¤Î¤ËÍÑ¤¤¤Þ¤¹¡£
Virtuald¤ÏÀßÄê¥Õ¥¡¥¤¥ë¤òÆÉ¤ß¹þ¤ß¡¢¤½¤ÎIP¤ËÂÐ±þ¤¹¤ë¥Ç¥£¥ì¥¯¥È¥ê¤ò¼èÆÀ¤·¤Þ¤¹¡£
¤½¤Î¥Ç¥£¥ì¥¯¥È¥ê¤Ë <CODE>chroot</CODE>¤·¤¿¸å¡¢¼ÂºÝ¤Ë¹Ô¤ï¤ì¤ë¥µ¡¼¥Ó¥¹¤ËÀÜÂ³¤ò
°ú¤ÅÏ¤·¤Þ¤¹¡£
<P><CODE> chroot </CODE> ¤Ï¥ë¡¼¥È¥Ç¥£¥ì¥¯¥È¥ê'/' ¤òÊÌ¤Î¥Ç¥£¥ì¥¯¥È¥ê¤Ë¥»¥Ã¥È
¤·Ä¾¤·¡¢¤½¤Î¥Ç¥£¥ì¥¯¥È¥ê(¿·¤·¤¤¥ë¡¼¥È¥Ç¥£¥ì¥¯¥È¥ê)¤è¤ê¤â¾å¤Ë¤¢¤ëÁ´¤Æ¤Î¤â¤Î
¤Ï¼Â¹Ô¤µ¤ì¤Æ¤¤¤ë¥×¥í¥°¥é¥à¤«¤é¤Ï¸«¤¨¤Þ¤»¤ó(ÀÚ¤êÎ¥¤µ¤ì¤Þ¤¹)¡£
¤³¤¦¤·¤Æ³ÆIP¥¢¥É¥ì¥¹¤Ï¤½¤ì¤¾¤ì¤Î²¾ÁÛ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤ò¼èÆÀ¤·¤Þ¤¹¡£
¤³¤ì¤Ï¥Í¥Ã¥È¥ï¡¼¥¯¥×¥í¥°¥é¥à¤«¤é¤ÏÆ©²áÅª¤Ê¤Î¤Ç(¾å¤Ë½ñ¤¤¤¿¤è¤¦¤ÊÁàºî¤Ï
±£¤·¤Æ¤¢¤ë¤Î¤Ç)¡¢¥×¥í¥°¥é¥à¤Ï²¿»ö¤â¤Ê¤«¤Ã¤¿¤«¤Î¤è¤¦¤ËÆ°ºî¤·¤Þ¤¹¡£
<P>¤³¤Î¤è¤¦¤Ë¤·¤Æ¡¢inetd¤È¤¤¤Ã¤¿¥×¥í¥°¥é¥à¤ÈÏ¢·ë¤µ¤ì¤¿Virtuald
¤Ï¤¤¤í¤¤¤í¤Ê¥µ¡¼¥Ó¥¹¤ò²¾ÁÛ²½¤·¤Æ»È¤¦¤³¤È¤¬¤Ç¤¤ë¤Î¤Ç¤¹¡£
<P>
<H2><A NAME="ss3.2">3.2 inetd </A>
</H2>

<P>Inetd¤ÏÊ£¿ô¤Î¥Ý¡¼¥È¤ò´Æ»ë¤·¡¢ÀÜÂ³¤¬¤¢¤Ã¤¿¾ì¹ç¤Ë(Îã¤¨¤ÐpopÍ×µá¤¬¤¢¤Ã¤¿¤È¤
¤Ê¤É¤Ë)¥Í¥Ã¥È¥ï¡¼¥¯¥Í¥´¥·¥¨¡¼¥·¥ç¥ó¹Ô¤Ã¤Æ»ØÄê¤µ¤ì¤¿¥×¥í¥°¥é¥à¤ËÀÜÂ³¤ò
°ú¤ÅÏ¤¹¥¹¡¼¥Ñ¡¼¥µ¡¼¥Ð¤Ç¤¹¡£
¤³¤ì¤Ë¤è¤ê¡¢É¬Í×¤¬¤Ê¤¯¤Æ²¿¤â¤·¤Æ¤¤¤Ê¤¤¥µ¡¼¥Ð¤¬¤Ê¤¤¤è¤¦¤Ë¤·¤Þ¤¹¡£
<P>É¸½àÅª¤Ê <CODE>/etc/inetd.conf</CODE>¥Õ¥¡¥¤¥ë¤Ï
<PRE>
ftp stream tcp nowait root /usr/sbin/tcpd wu.ftpd -l -a
pop-3 stream tcp nowait root /usr/sbin/tcpd in.qpop -s
</PRE>

¤È¤Ê¤ê¤Þ¤¹¡£(<EM>ÌõÃí¡§</EM>pop-3¤Ïpop3¤Î¾ì¹ç¤Ïpop3¤Ë¤·¤Æ²¼¤µ¤¤)¡£
<P>
<P>¤Þ¤¿²¾ÁÛÅª¤Ê<CODE>/etc/inetd.conf</CODE>¥Õ¥¡¥¤¥ë¤Ï
<PRE>
ftp stream tcp nowait root /usr/bin/virtuald virtuald /virtual/conf.ftp wu.ftpd -l -a
pop-3 stream tcp nowait root /usr/bin/virtuald virtuald /virtual/conf.pop in.qpop -s
</PRE>

¤È¤Ê¤ê¤Þ¤¹¡£
<P>
<P>
<H2><A NAME="ss3.3">3.3 virtual.conf</A>
</H2>

<P>¤½¤ì¤¾¤ì¤Î¥µ¡¼¥Ó¥¹¤ËÂÐ±þ¤¹¤ëIP¤È¥Ç¥£¥ì¥¯¥È¥ê¤ò¥³¥ó¥È¥í¡¼¥ë¤¹¤ë
conf¥Õ¥¡¥¤¥ë¤ò¼èÆÀ¤·¤Þ¤¹¡£°ì¤Ä¤Î¥Þ¥¹¥¿¡¼conf¥Õ¥¡¥¤¥ë¤¬¤¢¤ê¡¢¤Þ¤¿
¥É¥á¥¤¥ó¤Î°Û¤Ê¤ë¥ê¥¹¥È¤Î¥µ¡¼¥Ó¥¹¤¬É¬Í×¤Ê¤È¤¤Ï¤½¤ì¤Ë±þ¤¸¤¿conf¥Õ¥¡¥¤¥ë
¤òÍÑ°Õ¤¹¤ë¤³¤È¤¬¤Ç¤¤Þ¤¹¡£virtual.conf¤Ï°Ê²¼¤Î¤è¤¦¤ÊÆâÍÆ¤Ç¤¹¡£
<PRE>
# This is a comment and so are blank lines

# Format IP &lt;SPACE> dir &lt;NOSPACES>
10.10.10.129 /virtual/foo.bar.com
10.10.10.130 /virtual/bar.foo.com
10.10.10.157 /virtual/boo.la.com
</PRE>

(<EM>ÌõÃí¡§</EM>¼ÂºÝ¤ÎÃæ¿È¤Ï³ÆÀßÄê´Ä¶¤Ë¹ç¤ï¤»¤Æ½ñ¤´¹¤¨¤Æ²¼¤µ¤¤¡£
¤½¤·¤Æ¤³¤Î¥Õ¥¡¥¤¥ë¤Ï(¾å¤Îinitd.conf¤ÎÀßÄê¤Ë¹ç¤ï¤»¤¿)³ºÅö¥Ç¥£¥ì¥¯¥È¥ê
¤ª¤è¤Ó¥Õ¥¡¥¤¥ëÌ¾¤Ë¥³¥Ô¡¼¤·¤Þ¤¹)¡£
<P>
<H2><A NAME="ss3.4">3.4 virtuald¤Î¥½¡¼¥¹</A>
</H2>

<P>(<EM>ÌõÃí¡§</EM>¤³¤ÎVirtuald¤Î¥½¡¼¥¹¤Ï <CODE>gcc -o viturald virtuald.c</CODE>¤È¤·¤Æ
¥³¥ó¥Ñ¥¤¥ë¤Ç¤¤Þ¤¹¡£¤Þ¤¿¸å¤ÎÊ¸¾Ï¤È¹ç¤ï¤»¤ë¤¿¤á¤Ë<CODE>/usr/bin</CODE>¤Ë
¥³¥Ô¡¼¤·¤Þ¤¹)
<HR>
<PRE>
#include &lt;netinet/in.h>
#include &lt;sys/socket.h>
#include &lt;arpa/inet.h>
#include &lt;stdarg.h>
#include &lt;string.h>
#include &lt;syslog.h>
#include &lt;stdio.h>

#define BUFSIZE 8192

main(int argc,char **argv)
{
        char buffer[BUFSIZE];
        char *ipaddr,*dir;

        logit("Virtuald Starting: $Revision: 1.2 $");
        if (!argv[1])
        {
                logit("invalid arguments: no conf file");
                quitting_virtuald(0);
        }
        if (!argv[2])
        {
                logit("invalid arguments: no program to run");
                quitting_virtuald(0);
        }
        if (getipaddr(&amp;ipaddr))
        {
                logit("getipaddr failed");
                quitting_virtuald(0);
        }
        sprintf(buffer,"Incoming ip: %s",ipaddr);
        logit(buffer);
        if (iptodir(&amp;dir,ipaddr,argv[1]))
        {
                logit("iptodir failed");
                quitting_virtuald(0);
        }
        if (chroot(dir)&lt;0)
        {
                logit("chroot failed: %m");
                quitting_virtuald(0);
        }
        sprintf(buffer,"Chroot dir: %s",dir);
        logit(buffer);
        if (chdir("/")&lt;0)
        {
                logit("chdir failed: %m");
                quitting_virtuald(0);
        }
        if (execvp(argv[2],argv+2)&lt;0)
        {
                logit("execvp failed: %m");
                quitting_virtuald(0);
        }
}

int logit(char *buf)
{
        openlog("virtuald",LOG_PID,LOG_DAEMON);
        syslog(LOG_ERR,buf);
        closelog();
        return 0;
}

int quitting_virtuald(int retval)
{
        exit(retval);
        return 0;
}

int getipaddr(char **ipaddr)
{
        struct sockaddr_in virtual_addr;
        static char ipaddrbuf[BUFSIZE];
        int virtual_len;
        char *ipptr;

        virtual_len=sizeof(virtual_addr);
        if (getsockname(0,(struct sockaddr *)&amp;virtual_addr,&amp;virtual_len)&lt;0)
        {
                logit("getipaddr: getsockname failed: %m");
                return -1;
        }
        if (!(ipptr=inet_ntoa(virtual_addr.sin_addr)))
        {
                logit("getipaddr: inet_ntoa failed: %m");
                return -1;
        }
        strncpy(ipaddrbuf,ipptr,sizeof(ipaddrbuf)-1);
        *ipaddr=ipaddrbuf;
        return 0;
}

int iptodir(char **dir,char *ipaddr,char *filename)
{
        char buffer[BUFSIZE],*bufptr;
        static char dirbuf[BUFSIZE];
        FILE *fp;

        if (!(fp=fopen(filename,"r")))
        {
                logit("iptodir: fopen failed: %m");
                return -1;
        }
        *dir=NULL;
        while(fgets(buffer,BUFSIZE,fp))
        {
                buffer[strlen(buffer)-1]=0;
                if (*buffer=='#' || *buffer==0)
                        continue;
                if (!(bufptr=strchr(buffer,' ')))       
                {
                        logit("iptodir: strchr failed");
                        return -1;
                }
                *bufptr++=0;
                if (!strcmp(buffer,ipaddr))
                {
                        strncpy(dirbuf,bufptr,sizeof(dirbuf)-1);
                        *dir=dirbuf;
                        break;
                }
        }
        if (fclose(fp)==EOF)
        {
                logit("iptodir: fclose failed: %m");
                return -1;
        }
        if (!*dir)
        {
                logit("iptodir: ip not found in conf file");
                return -1;
        }
        return 0;
}
</PRE>
<HR>
<P>
<P>
<HR>
<A HREF="Virtual-Services-HOWTO-4.html">¼¡¤Î¥Ú¡¼¥¸</A>
<A HREF="Virtual-Services-HOWTO-2.html">Á°¤Î¥Ú¡¼¥¸</A>
<A HREF="Virtual-Services-HOWTO.html#toc3">ÌÜ¼¡¤Ø</A>
</BODY>
</HTML>
doc-linux-ja-html 2006.05.25-1.1 / usr / share / doc / HOWTO / ja-html / Virtual-Services-HOWTO-3.html
