## bin/mr/mirror_reflector.c

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## FUNCTIONS

This source file includes following functions.

1. main

       1 /***************************************
       2   $Revision: 1.7 $
       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 "sk.h"
      42
      43
      44 #define MAX_INPUT_SIZE 256
      45 #define TIMEOUT 60
      46 /* number of outstanding connections (backlog queue length) */
      47 #define BACKLOG 10
      48
      49 extern char *optarg;
      50
      51
      52 int main(int argc, char **argv)
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      53 {
      54 char input[MAX_INPUT_SIZE], output[MAX_INPUT_SIZE+1];
      55 char *mserver=NULL;
      56 int listen_port=0, connect_port=0;
      57 int listening_socket, client_socket, server_socket;
      58 struct hostent *hptr;
      59 struct sockaddr_in serv_addr;
      60 struct in_addr *paddr;
      61 int nwrite;
      62 int ilen;
      63 int c;
      64 int errflg=0;
      65 int pid;
      66 char *filter_name="./ripe2rpsl";
      67
      68
      69      if(argc<4) errflg++;
      70
      71      while ((c = getopt(argc, argv, "l:h:p:f:?")) != EOF)
      72      switch (c) {
      73       case 'l':
      74         listen_port = atoi(optarg);
      75         break;
      76       case 'h':
      77         mserver = optarg;
      78         break;
      79       case 'p':
      80         connect_port = htons(atoi(optarg));
      81         break;
      82       case 'f':
      83         filter_name = optarg;
      84         break;
      85       case '?':
      86       default :
      87         errflg++;
      88         break;
      89      }
      90      if (errflg) {
      91         fprintf(stderr,"usage: mr -l listen_port -h mirror_server -p port [-f convertor]\n");
      92         exit (2);
      93      }
      94
      95   listening_socket = SK_getsock(SOCK_STREAM, listen_port, BACKLOG, INADDR_ANY);
      96
      97   while (1) {
      98      client_socket = SK_accept_connection(listening_socket);
      99      if(client_socket==-1) {fprintf(stderr, "cannot accept client\n"); continue; }
     100      fprintf(stderr, "client connected\n");
     101      /* get the input from the client */
     102      SK_gets(client_socket, input, MAX_INPUT_SIZE);
     103      fprintf(stderr, "input:[%s]\n", input);
     104
     105
     106      /* create socket to connect to the server */
     107      if ((server_socket=socket(AF_INET, SOCK_STREAM, 0))==-1){
     108        perror("socket");
     109        exit(1);
     110      }
     111      hptr=gethostbyname(mserver);
     112      if (hptr) {
     113         paddr=(struct in_addr *)hptr->h_addr;
     114         bzero(&serv_addr, sizeof(serv_addr));
     115         serv_addr.sin_family=AF_INET;
     116         serv_addr.sin_port=connect_port;
     117         memcpy(&serv_addr.sin_addr, paddr, sizeof(struct in_addr));
     118         fprintf(stderr,"Trying %s port %d\n", inet_ntoa(serv_addr.sin_addr), connect_port);
     119         if(connect(server_socket, (struct sockaddr *)&serv_addr, sizeof(serv_addr))==-1) {
     120           perror("connect");
     121           close(client_socket);
     122           sleep(TIMEOUT);
     123           continue;
     124         }
     125      }
     126      fprintf(stderr, "Sending Invitation");
     127
     128      sprintf(output, "%s\n", input);
     129      ilen=strlen(output);
     130      nwrite=SK_write(server_socket, output, ilen, NULL, NULL);
     131      if(nwrite != 1) { perror("write"); exit(2); }
     132      fprintf(stderr, "...sent \n");
     133
     134      if((pid=fork())==0){
     135              close(listening_socket);
     136              if(dup2(server_socket, 0)==-1) perror("dup2-serv"); ; /* provide input from the mirror server */
     137              if(dup2(client_socket, 1)==-1) perror("dup2-clnt"); ; /* direct output to the client */
     138              fprintf(stderr, "Executing convertor: %s\n", filter_name);
     139              execlp(filter_name,filter_name, NULL);
     140              fprintf(stderr, "Cannot execute %s\n", filter_name);
     141      }
     142      fprintf(stderr, "waiting for convertor to finish...\n");
     143      wait(&pid); /* wait untill conversion finishes */
     144      fprintf(stderr, "...converting stream done\n");
     145
     146      close(server_socket);
     147      close(client_socket);
     148
     149
     150   }/* main loop */
     151
     152 }

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