## bin/mr/mirror_reflector.c

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## FUNCTIONS

This source file includes following functions.

1. main

       1 /***************************************
       2   $Revision: 1.2 $
       3
       4   Wrapper for NRTM client
       5
       6   Status: NOT REVUED, NOT TESTED
       7
       8  Author(s):       Andrei Robachevsky
       9
      10   ******************/ /******************
      11   Modification History:
      12         andrei (17/01/2000) Created.
      13   ******************/ /******************
      14   Copyright (c) 2000                              RIPE NCC
      15
      16   All Rights Reserved
      17
      18   Permission to use, copy, modify, and distribute this software and its
      19   documentation for any purpose and without fee is hereby granted,
      20   provided that the above copyright notice appear in all copies and that
      21   both that copyright notice and this permission notice appear in
      22   supporting documentation, and that the name of the author not be
      23   used in advertising or publicity pertaining to distribution of the
      24   software without specific, written prior permission.
      25
      26   THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
      27   ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO EVENT SHALL
      28   AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
      29   DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
      30   AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
      31   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
      32  ***************************************/
      33 #include <stdio.h>
      34 #include <unistd.h>
      35 #include <sys/param.h>
      36 #include <sys/types.h>
      37 #include <netinet/in.h>
      38 #include <arpa/inet.h>
      39 #include <sys/wait.h>
      40
      41 #include "socket.h"
      42
      43
      44 #define MAX_INPUT_SIZE 256
      45 #define TIMEOUT 60
      46
      47 int main(int argc, char **argv)
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      48 {
      49 char input[MAX_INPUT_SIZE], output[MAX_INPUT_SIZE+1];
      50 char *mserver=NULL;
      51 int listen_port=0, connect_port=0;
      52 int listening_socket, client_socket, server_socket;
      53 struct hostent *hptr;
      54 struct sockaddr_in serv_addr;
      55 struct in_addr *paddr;
      56 int nread, nwrite;
      57 int ilen;
      58 int c;
      59 sk_conn_st condat;
      60 int errflg=0;
      61 int pid;
      62 char *filter_name="./ripe2rpsl";
      63
      64
      65      if(argc<4) errflg++;
      66
      67      while ((c = getopt(argc, argv, "l:h:p:f:?")) != EOF)
      68      switch (c) {
      69       case 'l':
      70         listen_port = htons(atoi(optarg));
      71         break;
      72       case 'h':
      73         mserver = optarg;
      74         break;
      75       case 'p':
      76         connect_port = htons(atoi(optarg));
      77         break;
      78       case 'f':
      79         filter_name = optarg;
      80         break;
      81       case '?':
      82       default :
      83         errflg++;
      84         break;
      85      }
      86      if (errflg) {
      87         fprintf(stderr,"usage: mr -l listen_port -h mirror_server -p port [-f convertor]\n");
      88         exit (2);
      89      }
      90
      91   listening_socket = SK_getsock(SOCK_STREAM, listen_port, INADDR_ANY);
      92
      93   while (1) {
      94      client_socket = SK_accept_connection(listening_socket);
      95      if(client_socket==-1) {fprintf(stderr, "cannot accept client\n"); continue; }
      96      fprintf(stderr, "client connected\n");
      97      /* get the input from the client */
      98      SK_gets(client_socket, input, MAX_INPUT_SIZE);
      99      fprintf(stderr, "input:[%s]\n", input);
     100
     101
     102      /* create socket to connect to the server */
     103      if ((server_socket=socket(AF_INET, SOCK_STREAM, 0))==-1){
     104        perror("socket");
     105        exit(1);
     106      }
     107      hptr=gethostbyname(mserver);
     108      if (hptr) {
     109         paddr=(struct in_addr *)hptr->h_addr;
     110         bzero(&serv_addr, sizeof(serv_addr));
     111         serv_addr.sin_family=AF_INET;
     112         serv_addr.sin_port=connect_port;
     113         memcpy(&serv_addr.sin_addr, paddr, sizeof(struct in_addr));
     114         fprintf(stderr,"Trying %s port %d\n", inet_ntoa(serv_addr.sin_addr), connect_port);
     115         if(connect(server_socket, (struct sockaddr *)&serv_addr, sizeof(serv_addr))==-1) {
     116           perror("connect");
     117           close(client_socket);
     118           sleep(TIMEOUT);
     119           continue;
     120         }
     121      }
     122      fprintf(stderr, "Sending Invitation");
     123
     124      sprintf(output, "%s\n", input);
     125      ilen=strlen(output);
     126      nwrite=SK_write(server_socket, output, ilen);
     127      if(nwrite != ilen) { perror("write"); exit(2); }
     128      fprintf(stderr, "...sent \n");
     129
     130      if((pid=fork())==0){
     131              close(listening_socket);
     132              if(dup2(server_socket, 0)==-1) perror("dup2-serv"); ; /* provide input from the mirror server */
     133              if(dup2(client_socket, 1)==-1) perror("dup2-clnt"); ; /* direct output to the client */
     134              fprintf(stderr, "Executing convertor: %s\n", filter_name);
     135              execlp(filter_name,filter_name, NULL);
     136              fprintf(stderr, "Cannot execute %s\n", filter_name);
     137      }
     138      fprintf(stderr, "waiting for convertor to finish...\n");
     139      wait(&pid); /* wait untill conversion finishes */
     140      fprintf(stderr, "...converting stream done\n");
     141
     142      close(server_socket);
     143      close(client_socket);
     144
     145
     146   }/* main loop */
     147
     148 }

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