utils/mr/mr.c

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DEFINITIONS

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) 2000,2001,2002                    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 
  34 #include "rip.h"
  35 
  36 #include <stdio.h> 
  37 #include <unistd.h>
  38 #include <sys/param.h>
  39 #include <sys/types.h>
  40 #include <netinet/in.h>
  41 #include <arpa/inet.h>
  42 #include <sys/wait.h>
  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 sk_conn_st client_conn;
  59 struct hostent *hptr;
  60 struct sockaddr_in serv_addr;
  61 struct in_addr *paddr;
  62 int res;
  63 struct timeval timeout;
  64 int ilen;
  65 int c;
  66 int errflg=0;
  67 int pid;
  68 char *filter_name="./ripe2rpsl";
  69 
  70 
  71      if(argc<4) errflg++;
  72 
  73      while ((c = getopt(argc, argv, "l:h:p:f:?")) != EOF)
  74      switch (c) {
  75       case 'l':
  76         listen_port = atoi(optarg);
  77         break;  
  78       case 'h':
  79         mserver = optarg;
  80         break;
  81       case 'p':
  82         connect_port = htons(atoi(optarg));
  83         break;
  84       case 'f':
  85         filter_name = optarg;
  86         break;  
  87       case '?':
  88       default :
  89         errflg++;
  90         break;
  91      }
  92      if (errflg) {
  93         fprintf(stderr,"usage: mr -l listen_port -h mirror_server -p port [-f convertor]\n");
  94         exit (2);
  95      }
  96 
  97   listening_socket = SK_getsock(SOCK_STREAM, listen_port, BACKLOG, INADDR_ANY);
  98   bzero(&timeout, sizeof(timeout));
  99   timeout.tv_sec=TIMEOUT;
 100   
 101   while (1) {
 102      client_socket = SK_accept_connection(listening_socket);
 103      if(client_socket==-1) {fprintf(stderr, "cannot accept client\n"); continue; }
 104      fprintf(stderr, "client connected\n");
 105      SK_cd_make(&client_conn, client_socket, 0);
 106      /* get the input from the client */
 107      SK_cd_gets(&client_conn, input, MAX_INPUT_SIZE);
 108      fprintf(stderr, "input:[%s]\n", input);
 109 
 110 
 111      /* create socket to connect to the server */
 112      if ((server_socket=socket(AF_INET, SOCK_STREAM, 0))==-1){
 113        perror("socket");
 114        exit(1);
 115      }  
 116      hptr=gethostbyname(mserver);
 117      if (hptr) { 
 118         paddr=(struct in_addr *)hptr->h_addr;
 119         bzero(&serv_addr, sizeof(serv_addr));
 120         serv_addr.sin_family=AF_INET;
 121         serv_addr.sin_port=connect_port;
 122         memcpy(&serv_addr.sin_addr, paddr, sizeof(struct in_addr));
 123         fprintf(stderr,"Trying %s port %d\n", inet_ntoa(serv_addr.sin_addr), connect_port);
 124         if(connect(server_socket, (struct sockaddr *)&serv_addr, sizeof(serv_addr))==-1) { 
 125           perror("connect");
 126           close(client_socket);
 127           close(server_socket);
 128           sleep(TIMEOUT);
 129           continue;
 130         }
 131      } else {
 132       /* resolver error */
 133       fprintf(stderr,"Cannot resolve name %s\n", mserver);
 134       close(client_socket);
 135       close(server_socket);
 136       sleep(TIMEOUT);
 137       continue;
 138      }
 139      
 140      fprintf(stderr, "Sending Invitation");
 141      
 142      sprintf(output, "%s\n", input);
 143      res = SK_puts(server_socket, output, &timeout);
 144      if(res < 0) { 
 145         perror("write"); 
 146         sleep(TIMEOUT);
 147         continue;
 148      }
 149      fprintf(stderr, "...sent \n");
 150 
 151      if((pid=fork())==0){
 152              close(listening_socket);
 153              if(dup2(server_socket, 0)==-1) perror("dup2-serv"); ; /* provide input from the mirror server */
 154              if(dup2(client_socket, 1)==-1) perror("dup2-clnt"); ; /* direct output to the client */
 155              fprintf(stderr, "Executing convertor: %s\n", filter_name);
 156              execlp(filter_name,filter_name, NULL);
 157              fprintf(stderr, "Cannot execute %s\n", filter_name);
 158      } 
 159      fprintf(stderr, "waiting for convertor to finish...\n");
 160      wait(&pid); /* wait untill conversion finishes */
 161      fprintf(stderr, "...converting stream done\n");
 162      
 163      close(server_socket);
 164      close(client_socket);
 165 
 166 
 167   }/* main loop */
 168 
 169 }

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