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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