lib/libatm/ip_addr.c

   1 /*
   2  *
   3  * ===================================
   4  * HARP  |  Host ATM Research Platform
   5  * ===================================
   6  *
   7  *
   8  * This Host ATM Research Platform ("HARP") file (the "Software") is
   9  * made available by Network Computing Services, Inc. ("NetworkCS")
  10  * "AS IS".  NetworkCS does not provide maintenance, improvements or
  11  * support of any kind.
  12  *
  13  * NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
  14  * INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
  15  * AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
  16  * SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
  17  * In no event shall NetworkCS be responsible for any damages, including
  18  * but not limited to consequential damages, arising from or relating to
  19  * any use of the Software or related support.
  20  *
  21  * Copyright 1994-1998 Network Computing Services, Inc.
  22  *
  23  * Copies of this Software may be made, however, the above copyright
  24  * notice must be reproduced on all copies.
  25  *
  26  *      @(#) $FreeBSD: src/lib/libatm/ip_addr.c,v 1.3.2.1 2001/09/28 16:52:10 dillon Exp $
  27  *      @(#) $DragonFly: src/lib/libatm/ip_addr.c,v 1.4 2007/11/25 01:28:22 swildner Exp $
  28  *
  29  */
  30
  31 #include <sys/cdefs.h>
  32
  33 /*
  34  * User Space Library Functions
  35  * ----------------------------
  36  *
  37  * IP address utilities
  38  *
  39  */
  40
  41 #include <sys/types.h>
  42 #include <sys/param.h>
  43 #include <sys/socket.h>
  44 #include <net/if.h>
  45 #include <netinet/in.h>
  46 #include <arpa/inet.h>
  47 #include <netatm/port.h>
  48 #include <netatm/atm.h>
  49 #include <netatm/atm_if.h>
  50 #include <netatm/atm_sap.h>
  51 #include <netatm/atm_sys.h>
  52 #include <netatm/atm_ioctl.h>
  53
  54 #include <netdb.h>
  55 #include <stdio.h>
  56 #include <string.h>
  57
  58 #include "libatm.h"
  59
  60 /*
  61  * Get IP address
  62  *
  63  * Return an IP address in a socket address structure, given a character
  64  * string with a domain name or a dotted decimal number.
  65  *
  66  * Arguments:
  67  *      p       pointer to a host name or IP address
  68  *
  69  * Returns:
  70  *      null                    error was encountered
  71  *      struct sockaddr_in *    a pointer to a socket address with the
  72  *                              requested IP address
  73  *
  74  */
  75 struct sockaddr_in *
  76 get_ip_addr(p)
  77         char    *p;
  78 {
  79         struct hostent                  *ip_host;
  80         static struct sockaddr_in       sin;
  81
  82         /*
  83          * Get IP address of specified host name
  84          */
  85         UM_ZERO(&sin, sizeof(sin));
  86         sin.sin_family = AF_INET;
  87         if (p[0] >= '0' && p[0] <= '9') {
  88                 /*
  89                  * IP address is in dotted decimal format
  90                  */
  91                 if ((sin.sin_addr.s_addr = inet_addr(p)) == -1) {
  92                         return((struct sockaddr_in *)0);
  93                 }
  94         } else {
  95                 /*
  96                  * Host name is in domain name system format
  97                  */
  98                 ip_host = gethostbyname(p);
  99                 if (!ip_host ||
 100                                 ip_host->h_addrtype != AF_INET) {
 101                         return((struct sockaddr_in *)0);
 102                 }
 103                 sin.sin_addr.s_addr = *(u_long *)ip_host->h_addr_list[0];
 104         }
 105         return(&sin);
 106 }
 107
 108
 109 /*
 110  * Format an IP address
 111  *
 112  * Return a text-formatted string with an IP address and domain name
 113  * given a sockaddr_in with an IP address.
 114  *
 115  * Arguments:
 116  *      p       pointer to sockaddr_in with an IP address
 117  *
 118  * Returns:
 119  *      char *  pointer to a text-formatted string
 120  *
 121  */
 122 char *
 123 format_ip_addr(addr)
 124         struct in_addr  *addr;
 125 {
 126         static char     host_name[MAXHOSTNAMELEN + 18];
 127         char            *ip_num;
 128         struct hostent  *ip_host;
 129
 130         /*
 131          * Initialize
 132          */
 133         UM_ZERO(host_name, sizeof(host_name));
 134
 135         /*
 136          * Check for a zero address
 137          */
 138         if (!addr || addr->s_addr == 0) {
 139                 return("-");
 140         }
 141
 142         /*
 143          * Get address in dotted decimal format
 144          */
 145         ip_num = inet_ntoa(*addr);
 146
 147         /*
 148          * Look up name in DNS
 149          */
 150         ip_host = gethostbyaddr((char *)addr, sizeof(addr), AF_INET);
 151         if (ip_host && ip_host->h_name &&
 152                         strlen(ip_host->h_name)) {
 153                 /*
 154                  * Return host name followed by dotted decimal address
 155                  */
 156                 snprintf(host_name, sizeof(host_name), "%s (%s)",
 157                         ip_host->h_name, ip_num);
 158                 return (host_name);
 159         } else {
 160                 /*
 161                  * No host name -- just return dotted decimal address
 162                  */
 163                 return(ip_num);
 164         }
 165 }