ip2name.c

   1 /*
   2  * SARG Squid Analysis Report Generator      http://sarg.sourceforge.net
   3  *                                                            1998, 2010
   4  *
   5  * SARG donations:
   6  *      please look at http://sarg.sourceforge.net/donations.php
   7  * Support:
   8  *     http://sourceforge.net/projects/sarg/forums/forum/363374
   9  * ---------------------------------------------------------------------
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or
  14  *  (at your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License
  22  *  along with this program; if not, write to the Free Software
  23  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  24  *
  25  */
  26
  27 #include "include/conf.h"
  28 #include "include/defs.h"
  29
  30 void ip2name(char *ip,int ip_len)
  31 {
  32 #ifdef HAVE_GETNAMEINFO
  33    struct sockaddr_storage sa;
  34    char host[NI_MAXHOST];
  35    int n1,n2,n3,n4,next=0;
  36    int error;
  37
  38    memset(&sa,0,sizeof(sa));
  39    if (sscanf(ip,"%d.%d.%d.%d%n",&n1,&n2,&n3,&n4,&next)==4 && ip[next]=='\0') {
  40       struct sockaddr_in *s4=(struct sockaddr_in *)&sa;
  41       if (inet_pton(AF_INET,ip,&s4->sin_addr)!=1) return;
  42       sa.ss_family=AF_INET;
  43    } else {
  44       struct sockaddr_in6 *s6=(struct sockaddr_in6 *)&sa;
  45       if (inet_pton(AF_INET6,ip,&s6->sin6_addr)!=1) return;
  46       sa.ss_family=AF_INET6;
  47    }
  48    error=getnameinfo((struct sockaddr *)&sa,sizeof(sa),host,sizeof(host),NULL,0,0);
  49    if (error==0)
  50    {
  51       strncpy(ip,host,ip_len-1);
  52       ip[ip_len-1]='\0';
  53    } else {
  54       debuga(_("IP to name resolution (getnameinfo) on IP address %s failed with error %d - %s\n"),ip,error,gai_strerror(error));
  55    }
  56 #else
  57    struct in_addr addr;
  58    struct hostent *hp;
  59    char **p;
  60
  61    if (inet_aton(ip,&addr) == 0)
  62       return;
  63
  64    hp = gethostbyaddr(&addr, sizeof (addr), AF_INET);
  65    if (hp == NULL)
  66       return;
  67
  68    for (p = hp->h_addr_list; *p != 0; p++) {
  69       struct in_addr in;
  70
  71       (void) memcpy(&in.s_addr, *p, sizeof (in.s_addr));
  72       strncpy(ip,hp->h_name,ip_len-1);
  73       ip[ip_len-1]=0;
  74    }
  75 #endif
  76    return;
  77 }
  78
  79 void name2ip(char *name)
  80 {
  81    struct in_addr ia;
  82    struct hostent *hp;
  83    char *port;
  84    char n1[4];
  85    char n2[4];
  86    char n3[4];
  87    char n4[4];
  88    struct getwordstruct gwarea;
  89
  90    port=strchr(name,':');
  91    if (port) *port=0;
  92
  93    if((hp=gethostbyname(name))==NULL)
  94       return;
  95
  96    memcpy(&ia.s_addr,hp->h_addr_list[0],sizeof(ia.s_addr));
  97    ia.s_addr=ntohl(ia.s_addr);
  98    getword_start(&gwarea,inet_ntoa(ia));
  99    if (getword(n4,sizeof(n4),&gwarea,'.')<0 || getword(n3,sizeof(n3),&gwarea,'.')<0 ||
 100          getword(n2,sizeof(n2),&gwarea,'.')<0 || getword(n1,sizeof(n1),&gwarea,0)<0) {
 101       printf("SARG: Maybe you have a broken record or garbage in your %s ip address.\n",gwarea.beginning);
 102       exit(EXIT_FAILURE);
 103    }
 104    sprintf(name,"%s.%s.%s.%s",n1,n2,n3,n4);
 105
 106    return;
 107 }