1 : telnet WWW telnet WWW URL (html ) ( URL ) [Kenta-Oshiro:network/slab2-np/rep01] j06012% telnet 80 nkf -e GET /index.html HTTP/1

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2 1 : telnet WWW telnet WWW URL (html ) ( URL ) [Kenta-Oshiro:network/slab2-np/rep01] j06012% telnet 80 nkf -e GET /index.html HTTP/1.0 Connection closed by foreign host. Trying Connected to Escape character is ^]. HTTP/ OK Date: Tue, 11 Dec :31:51 GMT sin: Apache/ (Red Hat) Last-Modified: Tue, 11 Dec :58:20 GMT ETag: "53cc e29fcb00" Accept-Ranges: bytes Content-Length: Connection: close Content-Type: text/html <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=shift_jis"> <meta http-equiv="content-script-type" content="text/javascript" /> <title> </title> <style type="text/css">  </style> <link href="preview/ryudai2.css" rel="stylesheet" type="text/css"> <script type="text/javascript" src="/js/prototype.js"></script> <script type="text/javascript" src="/js/scriptaculous.js?load=effects"></script> <script type="text/javascript" src="/js/lightbox.js"></script> <link rel="stylesheet" href="/css/lightbox.css" type="text/css" media="screen" / > ~~~~~~~~~~ ~~~~~~~~~~

3 2 : inetd (1) (sin.c) inetd (client.c) (1) (Connect,Disconnect,Send Data,Recv Data ) xinetd inetd inetd xinetd j06001 Kazuki AKAMINE sin.c sin services % sudo emacs -nw /etc/services tcpinetd 5682/tcp tcpinetd xinetd.d % sudo emacs -nw /etc/xinetd.d/tcpinetd sin xinetd % sudo emacs -nw /System/Library/StartupItems/IPServices/IPServices /usr/sbin/xinetd -inetd compat -pidfile /var/run/xinetd.pid StartService() % sudo /System/Library/StartupItems/IPServices/IPServices start sin.c #include <stdlib.h> exit() #define DATAFILE "/Users/j06012/INFO-jikken2/network/data" client.c #include <stdlib.h> exit() #define HOST_NAME "localhost"

4 [Kenta-Oshiro:~/INFO-jikken2/network] j06012%./client Connected. Input Keyword = warning: this program uses gets(), which is unsafe. yama Keyword = [yama] / Data = [kawa] Input Keyword = xyz Keyword = [xyz] / Data = [XYZ] Input Keyword = 123 Keyword = [123] / Data = [456] Input Keyword = xxxx Keyword = [xxxx] / Data = [yyyy] Input Keyword = shiro Keyword = [shiro] / Data = [kuro] Input Keyword = ^C Connect() host name host address Disconnect() SendData() RecvData() GetLineFromPeer GetKeywordData Data

5 Client Server Connect() 通信路を確立リクエストコネクションの確立 xinetd() server の呼び出しレスポンス SendData() write() データの送信 GetLineFromPeer() read() データの受信 RecvData() read() データの送信 GetKeywordData() fopen(), fclose() Disconnect() close() ソケットの終了 xinetd() 閉じる 1: 3 :inetd (1) (sin.c) inetd inetd inetd myserver.c #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/types.h> #include <sys/errno.h> #include <string.h> #include <ctype.h> #include <sys/socket.h> #include <netinet/in.h> #include <netdb.h> #define DATAFILE "/Users/j06012/INFO-jikken2/network/slab2-np/rep01/ex3/data2" #define DELIMITS " \t\n\r" /* \t:, \n:, \r: */

6 #define SERVICE_NAME "tcpinetd2"/* /etc/services */ #define PROTOCOL "tcp" char datavalue[256]; /* client */ int GetLineFromPeer(char *line, int socket_num) int i; for(i=0;;) if(1!= read(socket_num, line+i, 1)) continue; else i++; line[i] = \0 ; if( \n == line[i-1]) return i; char *GetKeywordData(char *key) FILE *fp; char buff[256]; if((file *)NULL == (fp = fopen(datafile,"r"))) return (char *)NULL; for(;;) char *p; /* 1 ( )*/ char *pp; /* 2 (p )*/ fgets(buff,256,fp); if(feof(fp)) break; if(ferror(fp)) break; if((char *)NULL == (p = strtok(buff,delimits))) //data2 continue; if((char *)NULL == (pp = strtok((char *)NULL,DELIMITS)))//data2 continue; if(0 == strcmp(p,key)) fclose(fp); strcpy(datavalue,pp); /* */ return datavalue;

7 fclose(fp); return (char *)NULL; int main(void) int socket_num, new_socket_num; struct sockaddr_in serv, clit; struct servent *ServiceEntry; socklen_t sock_size = sizeof(clit); char RecvBuff[256]; /* */ if( (socket_num = socket(af_inet, SOCK_STREAM, 0)) < 0 ) perror("socket()"); /* IP */ if((serviceentry = getservbyname(service_name, PROTOCOL)) == NULL) perror("getservbyname()"); serv.sin_port = ServiceEntry->s_port; serv.sin_family = AF_INET; serv.sin_addr.s_addr = htonl(inaddr_any); /* */ /* */ /* */ if(bind(socket_num, (struct sockaddr *)(&serv), sizeof(serv)) < 0) perror("bind()"); /* */ if(listen(socket_num, SOMAXCONN) < 0) perror("listen()"); for(;;) /* */ /* */ if((new_socket_num = accept(socket_num, (struct sockaddr *)(&clit), &sock_size)) < 0) perror("accept()");

8 /* */ for(;;) char *p; char SendBuff[256]; char *pp; (void)getlinefrompeer(recvbuff, new_socket_num); break; if( = == RecvBuff[0]) /* If End Mark */ if((char *)NULL!= (p = strchr(recvbuff, = ))) *p = \0 ; /* = \0 */ if((char *)NULL == (pp = GetKeywordData(RecvBuff))) sprintf(sendbuff, "%s=\n", RecvBuff); else sprintf(sendbuff, "%s=%s\n", RecvBuff,pp); (void)write(new_socket_num, SendBuff, strlen(sendbuff)); close(new_socket_num); /* */ return 0; myclient.c /*** TCP Client ***/ #include <stdio.h> #include <ctype.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <netdb.h> #include <stdlib.h> #define SERVICE_NAME "tcpinetd2" #define PROTOCOL "tcp" #define HOST_NAME "localhost"

9 int Connect() int SocketNumber; /* Socket descripter */ struct servent *ServiceEntry; /* service entry */ struct hostent *HostEntry; /* host entry */ struct sockaddr_in sin; /* Socket Entry */ /* Get Service Entry by Service-Name */ if((struct servent *)NULL == (ServiceEntry = getservbyname(service_name,protocol))) printf("\7no service [%s].\n",service_name); /* Get Host Entry by Host-Name */ if((struct hostent *)NULL == (HostEntry = gethostbyname(host_name))) printf("\7no Hosts [%s].\n",host_name); /* Get Socket */ if(0 > (SocketNumber = (socket(af_inet,sock_stream,0)))) printf("\7cannot get Socket.\n"); /* Set protocol family name */ sin.sin_family = AF_INET; /* Set Host Address */ bcopy(hostentry->h_addr,&sin.sin_addr,hostentry->h_length); /* Set Port N.o. */ sin.sin_port = ServiceEntry->s_port; if(0 > connect(socketnumber,(struct sockaddr *)(&sin),sizeof(sin))) printf("\7cannot Connect.\n"); return SocketNumber;

10 void Disconnect(int SocketNumber) close(socketnumber); void SendData(int SocketNumber,char *line) if(strlen(line)!= write(socketnumber,line,strlen(line))) printf("\7send Failed.\n"); int RecvData(int SocketNumber,char *line) int i; for(i = 0 ;;) if(1!= read(socketnumber,line + i,1)) continue; else i++; *(line + i) = (char)0; if(((char)( \n )) == *(line + i - 1)) return i; int main() int Sock; char Key[256]; char Data[256]; char buff[256]; Sock = Connect(); /* Connect */ printf("connected.\n"); for(;;) char *p; printf("input Keyword = "); fflush(stdout);

11 gets(key); sprintf(buff,"%s=\n",key); SendData(Sock,buff); /* Send It! */ if(0 == strlen(key)) break; /* If End Mark */ /* ---- Waiting for Server response Here --- */ (void)recvdata(sock,buff); /* Recv It! */ if((char *)NULL!= (p = strchr(buff, \n ))) *p = (char)0; if((char *)NULL!= (p = strchr(buff, = ))) p++; printf("keyword = [%s] / Data = [%s]\n\n",key,p); Disconnect(Sock); /* Disconnect */ printf("disocnnected.\n"); data2 oshiro kenta abc ABC yyyy zzzz aka kuro [Kenta-Oshiro:slab2-np/rep01/ex3] j06012%./myserver & [1] [Kenta-Oshiro:slab2-np/rep01/ex3] j06012% jobs [1] + Running./myserver [Kenta-Oshiro:slab2-np/rep01/ex3] j06012%./myclient

12 Connected. warning: this program uses gets(), which is unsafe. Input Keyword = aka Keyword = [aka] / Data = [kuro] Input Keyword = abc Keyword = [abc] / Data = [ABC] Input Keyword = oshiro Keyword = [oshiro] / Data = [kenta] Input Keyword = yyyy Keyword = [yyyy] / Data = [zzzz] inetd(xinetd) inetd inetd inetd ~ ~ 4 :HTTP HTML WWW URL [ ] > httpget ( html ) *C telnet NNTP,SMTP,POP3 http get.c /*** TCP Client ***/ #include <stdio.h> #include <stdlib.h>

13 #include <ctype.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <netdb.h> #define BUF_LEN 256 #define PORT 80 #define SERVICE_NAME "http" #define PROTOCOL "tcp" // // void Disconnect(int SocketNumber) close(socketnumber); void SendData(int SocketNumber,char *line) if(strlen(line)!= write(socketnumber,line,strlen(line))) printf("\7send Failed.\n"); int RecvData(int SocketNumber,char *line) int i; for(i = 0 ;;) if(1!= read(socketnumber,line + i,1)) continue; else i++; *(line + i) = (char)0; if(((char)( \n )) == *(line + i - 1)) return i; int main() int Sock; char path[buf_len]; char buff[buf_len]; // // HTTP

14 char HOST_NAME[BUF_LEN]; // int SocketNumber; /* Socket descripter */ struct servent *ServiceEntry; // (http ) struct hostent *HostEntry; // IP struct sockaddr_in sin; // /* Get Service Entry by Service-Name */ if((struct servent *)NULL == (ServiceEntry = getservbyname(service_name,protocol))) printf("\7no service [%s].\n",service_name); /* Get Host Entry by Host-Name */ printf("input www sin = "); gets(host_name); printf("\n"); if((struct hostent *)NULL == (HostEntry = gethostbyname(host_name))) printf("\7no Hosts [%s].\n",host_name); /* Get Socket */ if(0 > (SocketNumber = (socket(pf_inet,sock_stream,0)))) printf("\7cannot get Socket.\n"); bzero((char *)(&sin), sizeof(sin)); bcopy(hostentry->h_addr,&sin.sin_addr,hostentry->h_length); sin.sin_family = PF_INET; sin.sin_port = htons(port); if(0 > connect(socketnumber,(struct sockaddr *)(&sin),sizeof(sin))) printf("\7cannot Connect.\n"); Sock = SocketNumber; /* Connect */

15 printf("connected.\n"); char *p; printf("input Path = "); fflush(stdout); gets(path); if(0 == strlen(path)) Disconnect(Sock); printf("disocnnected.\n"); sprintf(buff,"get %s HTTP/1.0\r\n",path); SendData(Sock,buff); sprintf(buff,"host: %s:%d\r\n", HOST_NAME, PORT); SendData(Sock,buff); sprintf(buff,"\r\n"); SendData(Sock,buff); /* Send It! */ while (1) char buf[buf_len]; int size; size = read(sock, buf, BUF_LEN); if ( size > 0 ) write(1, buf, size); else break; Disconnect(Sock); printf("disocnnected.\n"); [Kenta-Oshiro:~/INFO-jikken2/network] j06012%./http_get warning: this program uses gets(), which is unsafe. Input www sin = Connected. Input Path = /index.html HTTP/ OK Date: Thu, 20 Dec :58:50 GMT sin: Apache/ (Unix) mod_ssl/ OpenSSL/0.9.7l PHP/5.1.2

16 Last-Modified: Tue, 11 Dec :40:24 GMT ETag: "14c fa00" Accept-Ranges: bytes Content-Length: Cache-Control: max-age=60 Expires: Thu, 20 Dec :59:50 GMT Connection: close Content-Type: text/html <HTML> <HEAD> <META http-equiv="content-type" content="text/html; charset=shift_jis">  <META http-equiv="content-style-type" content="text/css"> <LINK rel="shortcut ICON" href="icon/fav-ie2.ico">  ~~~~~~~~~~ ~~~~~~~~~~ 5 ( ) ( ok) ( ) netstat -l ( ) ( ) scan port #include <stdio.h> #include <ctype.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <netdb.h> #include <stdlib.h> #define SERVICE_NAME "tcpinetd" #define PROTOCOL "tcp" #define HOST_NAME "localhost" #define BUF_LEN 256 int main(int argc, char *argv[]) int i;

17 int servsoc; struct hostent *servhost; struct sockaddr_in sin; char host[buf_len]; unsigned short port; // IP // printf("input host : "); gets(host); printf("\n"); /* (IP ) */ servhost = gethostbyname(host); if ( servhost == NULL ) fprintf(stderr, "[%s] IP \n", host); return(0); bzero(&sin, sizeof(sin)); sin.sin_family = AF_INET; bcopy(servhost->h_addr, &sin.sin_addr, servhost->h_length); /* well known port */ for(i=0; i<1024; i++) sin.sin_port = htons(i); if((servsoc = (socket(af_inet, SOCK_STREAM, 0)) < 0)) printf("\7cannot get Socket.\n"); if(connect(servsoc, (struct sockaddr *)(&sin), sizeof(sin)) < 0) else printf("port %d is open\n",i); close(servsoc); printf("\nport Scan end\n"); printf("disocnnected.\n"); [Kenta-Oshiro:~/INFO-jikken2/network] j06012%./scan_port warning: this program uses gets(), which is unsafe.

18 Input host : Port 22 is open Port 80 is open Port 106 is open Port 111 is open Port 311 is open Port 389 is open Port 427 is open Port 443 is open Port 548 is open Port 625 is open Port 1010 is open Port 1012 is open Port 1013 is open Port Scan end Disocnnected. 6 (2) ( ) gets() dmy gets gets TCP/IP [Kenta-Oshiro:~/INFO-jikken2/network] j06012%./bufovf before buf(len:0) = dmy(len:0) = warning: this program uses gets(), which is unsafe. hogehogehogehogehogehogehogehogehogehogehogehogehogehogehogehoge after buf(len:64) = hogehogehogehogehogehogehogehogehogehogehogehogehogehogehogehoge dmy(len:0) = Segmentation fault bufovf.c BUFLEN 30 Segmentation fault gets() dmy[]

19 gets() fgets() #include <stdlib.h> exit() #include <string.h> memset(),strlen() if ((rtn = gets(buf)) == NULL) if ((rtn = fgets(buf,buflen,stdin)) == NULL) [Kenta-Oshiro:~/INFO-jikken2/network] j06012%./mybufovf before buf(len:0) = dmy(len:0) = hogehogehogehogehogehogehogehogehogehogehogehogehogehogehogehoge after buf(len:29) = hogehogehogehogehogehogehogeh dmy(len:0) = OS 7 ( ) tcpv6c IPv4 IPv6 tcpc IPv4

20 tcpc.c gethostbyname() IP getservbyname() tcpv6c.c getaddrinfo() IP tcpc.c tcpv6c.c tcpv6c.c tcpc.c getaddrinfo() (JM Project ) getaddrinfo() getipnodebyname(), getipnodebyaddr(), getservbyname(), getservbyport() getaddrinfo() bind() connect(2) 8 [1]JM Project [2]Wikipedia [3]

1 telnet WWW 1.1 telnet WWW URL html 1.2 URL 1 % telnet 80 Trying 2001:2f8:1c:d048::850d: telnet: c

2 065708F 2007 12 20 1 1 telnet WWW 1.1 telnet WWW URL html 1.2 URL 1 www.ie.u-ryukyu.ac.jp % telnet www.ie.u-ryukyu.ac.jp 80 Trying 2001:2f8:1c:d048::850d:3008... telnet: connect to address 2001:2f8:1c:d048::850d:3008: