## bin/mr/mirror_reflector.c

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## FUNCTIONS

This source file includes following functions.

1. main

       1 /***************************************
       2   $Revision: 1.1 $
       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
      46 int main(int argc, char **argv)
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      47 {
      48 char input[MAX_INPUT_SIZE], output[MAX_INPUT_SIZE+1];
      49 char *mserver=NULL;
      50 int listen_port=0, connect_port=0;
      51 int listening_socket, client_socket, server_socket;
      52 struct hostent *hptr;
      53 struct sockaddr_in serv_addr;
      54 struct in_addr *paddr;
      55 int nread, nwrite;
      56 int ilen;
      57 int c;
      58 sk_conn_st condat;
      59 int errflg=0;
      60 int pid;
      61 char *filter_name="./ripe2rpsl";
      62
      63
      64      if(argc<4) errflg++;
      65
      66      while ((c = getopt(argc, argv, "l:h:p:f:?")) != EOF)
      67      switch (c) {
      68       case 'l':
      69         listen_port = htons(atoi(optarg));
      70         break;
      71       case 'h':
      72         mserver = optarg;
      73         break;
      74       case 'p':
      75         connect_port = htons(atoi(optarg));
      76         break;
      77       case 'f':
      78         filter_name = optarg;
      79         break;
      80       case '?':
      81       default :
      82         errflg++;
      83         break;
      84      }
      85      if (errflg) {
      86         fprintf(stderr,"usage: mr -l listen_port -h mirror_server -p port [-f convertor]\n");
      87         exit (2);
      88      }
      89
      90   listening_socket = SK_getsock(SOCK_STREAM, listen_port, INADDR_ANY);
      91
      92   while (1) {
      93      client_socket = SK_accept_connection(listening_socket);
      94      if(client_socket==-1) {fprintf(stderr, "cannot accept client\n"); continue; }
      95      fprintf(stderr, "client connected\n");
      96      /* get the input from the client */
      97      SK_gets(client_socket, input, MAX_INPUT_SIZE);
      98      fprintf(stderr, "input:[%s]\n", input);
      99
     100
     101      /* create socket to connect to the server */
     102      if ((server_socket=socket(AF_INET, SOCK_STREAM, 0))==-1){
     103        perror("socket");
     104        exit(1);
     105      }
     106      hptr=gethostbyname(mserver);
     107      if (hptr) {
     108         paddr=(struct in_addr *)hptr->h_addr;
     109         bzero(&serv_addr, sizeof(serv_addr));
     110         serv_addr.sin_family=AF_INET;
     111         serv_addr.sin_port=connect_port;
     112         memcpy(&serv_addr.sin_addr, paddr, sizeof(struct in_addr));
     113         fprintf(stderr,"Trying %s port %d\n", inet_ntoa(serv_addr.sin_addr), connect_port);
     114         if(connect(server_socket, (struct sockaddr *)&serv_addr, sizeof(serv_addr))==-1) {
     115           perror("connect");
     116           exit(1);
     117         }
     118      }
     119      fprintf(stderr, "Sending Invitation");
     120
     121      sprintf(output, "%s\n", input);
     122      ilen=strlen(output);
     123      nwrite=SK_write(server_socket, output, ilen);
     124      if(nwrite != ilen) { perror("write"); exit(2); }
     125      fprintf(stderr, "...sent \n");
     126
     127      if((pid=fork())==0){
     128              close(listening_socket);
     129              if(dup2(server_socket, 0)==-1) perror("dup2-serv"); ; /* provide input from the mirror server */
     130              if(dup2(client_socket, 1)==-1) perror("dup2-clnt"); ; /* direct output to the client */
     131              fprintf(stderr, "Executing convertor: %s\n", filter_name);
     132              execlp(filter_name,filter_name, NULL);
     133              fprintf(stderr, "Cannot execute %s\n", filter_name);
     134      }
     135      fprintf(stderr, "waiting for convertor to finish...\n");
     136      wait(&pid); /* wait untill conversion finishes */
     137      fprintf(stderr, "...converting stream done\n");
     138
     139      close(server_socket);
     140      close(client_socket);
     141
     142
     143   }/* main loop */
     144
     145 }

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