## bin/mr/mirror_reflector.c

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## FUNCTIONS

This source file includes following functions.

1. main

       1 /***************************************
       2   $Revision: 1.4 $
       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 int main(int argc, char **argv)
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      50 {
      51 char input[MAX_INPUT_SIZE], output[MAX_INPUT_SIZE+1];
      52 char *mserver=NULL;
      53 int listen_port=0, connect_port=0;
      54 int listening_socket, client_socket, server_socket;
      55 struct hostent *hptr;
      56 struct sockaddr_in serv_addr;
      57 struct in_addr *paddr;
      58 int nwrite;
      59 int ilen;
      60 int c;
      61 int errflg=0;
      62 int pid;
      63 char *filter_name="./ripe2rpsl";
      64
      65
      66      if(argc<4) errflg++;
      67
      68      while ((c = getopt(argc, argv, "l:h:p:f:?")) != EOF)
      69      switch (c) {
      70       case 'l':
      71         listen_port = htons(atoi(optarg));
      72         break;
      73       case 'h':
      74         mserver = optarg;
      75         break;
      76       case 'p':
      77         connect_port = htons(atoi(optarg));
      78         break;
      79       case 'f':
      80         filter_name = optarg;
      81         break;
      82       case '?':
      83       default :
      84         errflg++;
      85         break;
      86      }
      87      if (errflg) {
      88         fprintf(stderr,"usage: mr -l listen_port -h mirror_server -p port [-f convertor]\n");
      89         exit (2);
      90      }
      91
      92   listening_socket = SK_getsock(SOCK_STREAM, listen_port, BACKLOG, INADDR_ANY);
      93
      94   while (1) {
      95      client_socket = SK_accept_connection(listening_socket);
      96      if(client_socket==-1) {fprintf(stderr, "cannot accept client\n"); continue; }
      97      fprintf(stderr, "client connected\n");
      98      /* get the input from the client */
      99      SK_gets(client_socket, input, MAX_INPUT_SIZE);
     100      fprintf(stderr, "input:[%s]\n", input);
     101
     102
     103      /* create socket to connect to the server */
     104      if ((server_socket=socket(AF_INET, SOCK_STREAM, 0))==-1){
     105        perror("socket");
     106        exit(1);
     107      }
     108      hptr=gethostbyname(mserver);
     109      if (hptr) {
     110         paddr=(struct in_addr *)hptr->h_addr;
     111         bzero(&serv_addr, sizeof(serv_addr));
     112         serv_addr.sin_family=AF_INET;
     113         serv_addr.sin_port=connect_port;
     114         memcpy(&serv_addr.sin_addr, paddr, sizeof(struct in_addr));
     115         fprintf(stderr,"Trying %s port %d\n", inet_ntoa(serv_addr.sin_addr), connect_port);
     116         if(connect(server_socket, (struct sockaddr *)&serv_addr, sizeof(serv_addr))==-1) {
     117           perror("connect");
     118           close(client_socket);
     119           sleep(TIMEOUT);
     120           continue;
     121         }
     122      }
     123      fprintf(stderr, "Sending Invitation");
     124
     125      sprintf(output, "%s\n", input);
     126      ilen=strlen(output);
     127      nwrite=SK_write(server_socket, output, ilen);
     128      if(nwrite != ilen) { perror("write"); exit(2); }
     129      fprintf(stderr, "...sent \n");
     130
     131      if((pid=fork())==0){
     132              close(listening_socket);
     133              if(dup2(server_socket, 0)==-1) perror("dup2-serv"); ; /* provide input from the mirror server */
     134              if(dup2(client_socket, 1)==-1) perror("dup2-clnt"); ; /* direct output to the client */
     135              fprintf(stderr, "Executing convertor: %s\n", filter_name);
     136              execlp(filter_name,filter_name, NULL);
     137              fprintf(stderr, "Cannot execute %s\n", filter_name);
     138      }
     139      fprintf(stderr, "waiting for convertor to finish...\n");
     140      wait(&pid); /* wait untill conversion finishes */
     141      fprintf(stderr, "...converting stream done\n");
     142
     143      close(server_socket);
     144      close(client_socket);
     145
     146
     147   }/* main loop */
     148
     149 }

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