## utils/mr/mr.c

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## FUNCTIONS

This source file includes following functions.

1. main

       1 /***************************************
       2   $Revision: 1.3 $
       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 struct hostent *hptr;
      59 struct sockaddr_in serv_addr;
      60 struct in_addr *paddr;
      61 int res;
      62 struct timeval timeout;
      63 int ilen;
      64 int c;
      65 int errflg=0;
      66 int pid;
      67 char *filter_name="./ripe2rpsl";
      68
      69
      70      if(argc<4) errflg++;
      71
      72      while ((c = getopt(argc, argv, "l:h:p:f:?")) != EOF)
      73      switch (c) {
      74       case 'l':
      75         listen_port = atoi(optarg);
      76         break;
      77       case 'h':
      78         mserver = optarg;
      79         break;
      80       case 'p':
      81         connect_port = htons(atoi(optarg));
      82         break;
      83       case 'f':
      84         filter_name = optarg;
      85         break;
      86       case '?':
      87       default :
      88         errflg++;
      89         break;
      90      }
      91      if (errflg) {
      92         fprintf(stderr,"usage: mr -l listen_port -h mirror_server -p port [-f convertor]\n");
      93         exit (2);
      94      }
      95
      96   listening_socket = SK_getsock(SOCK_STREAM, listen_port, BACKLOG, INADDR_ANY);
      97   bzero(&timeout, sizeof(timeout));
      98   timeout.tv_sec=TIMEOUT;
      99
     100   while (1) {
     101      client_socket = SK_accept_connection(listening_socket);
     102      if(client_socket==-1) {fprintf(stderr, "cannot accept client\n"); continue; }
     103      fprintf(stderr, "client connected\n");
     104      /* get the input from the client */
     105      SK_gets(client_socket, input, MAX_INPUT_SIZE);
     106      fprintf(stderr, "input:[%s]\n", input);
     107
     108
     109      /* create socket to connect to the server */
     110      if ((server_socket=socket(AF_INET, SOCK_STREAM, 0))==-1){
     111        perror("socket");
     112        exit(1);
     113      }
     114      hptr=gethostbyname(mserver);
     115      if (hptr) {
     116         paddr=(struct in_addr *)hptr->h_addr;
     117         bzero(&serv_addr, sizeof(serv_addr));
     118         serv_addr.sin_family=AF_INET;
     119         serv_addr.sin_port=connect_port;
     120         memcpy(&serv_addr.sin_addr, paddr, sizeof(struct in_addr));
     121         fprintf(stderr,"Trying %s port %d\n", inet_ntoa(serv_addr.sin_addr), connect_port);
     122         if(connect(server_socket, (struct sockaddr *)&serv_addr, sizeof(serv_addr))==-1) {
     123           perror("connect");
     124           close(client_socket);
     125           close(server_socket);
     126           sleep(TIMEOUT);
     127           continue;
     128         }
     129      } else {
     130       /* resolver error */
     131       fprintf(stderr,"Cannot resolve name %s\n", mserver);
     132       close(client_socket);
     133       close(server_socket);
     134       sleep(TIMEOUT);
     135       continue;
     136      }
     137
     138      fprintf(stderr, "Sending Invitation");
     139
     140      sprintf(output, "%s\n", input);
     141      res = SK_puts(server_socket, output, &timeout);
     142      if(res < 0) {
     143         perror("write");
     144         sleep(TIMEOUT);
     145         continue;
     146      }
     147      fprintf(stderr, "...sent \n");
     148
     149      if((pid=fork())==0){
     150              close(listening_socket);
     151              if(dup2(server_socket, 0)==-1) perror("dup2-serv"); ; /* provide input from the mirror server */
     152              if(dup2(client_socket, 1)==-1) perror("dup2-clnt"); ; /* direct output to the client */
     153              fprintf(stderr, "Executing convertor: %s\n", filter_name);
     154              execlp(filter_name,filter_name, NULL);
     155              fprintf(stderr, "Cannot execute %s\n", filter_name);
     156      }
     157      fprintf(stderr, "waiting for convertor to finish...\n");
     158      wait(&pid); /* wait untill conversion finishes */
     159      fprintf(stderr, "...converting stream done\n");
     160
     161      close(server_socket);
     162      close(client_socket);
     163
     164
     165   }/* main loop */
     166
     167 }

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