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1926 libresolv evades compiler warnings


   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*

  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T     */
  28 /*        All Rights Reserved   */
  29 
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39 
  40 #pragma ident   "%Z%%M% %I%     %E% SMI"
  41 
  42 #include <sys/types.h>
  43 #include <sys/sockio.h>
  44 #include <sys/socket.h>
  45 #include <netinet/in.h>
  46 #include <stdio.h>




  47 #include <arpa/nameser.h>
  48 #include <resolv.h>
  49 
  50 #include <netinet/in.h>
  51 #include <net/if.h>
  52 #include <netinet/if_ether.h>
  53 #include <arpa/inet.h>
  54 






  55 #define MAXIFS  256
  56 
  57 /*
  58  * Resolver state default settings
  59  */
  60 
  61 struct state _res = {
  62         RES_TIMEOUT,            /* retransmition time interval */
  63         4,                              /* number of times to retransmit */
  64         RES_DEFAULT,            /* options flags */
  65         1,                              /* number of name servers */
  66 };
  67 
  68 /*
  69  * Set up default settings.  If the configuration file exist, the values
  70  * there will have precedence.  Otherwise, the server address is set to
  71  * INADDR_LOOPBACK and the default domain name comes from the gethostname().
  72  * BUT if the NIS/RPC domain name is set, that is used if all else fails.
  73  *
  74  * The configuration file should only be used if you want to redefine your
  75  * domain or run without a server on your machine.
  76  *
  77  * Note the user can always override then domain name with the environment
  78  * variable LOCALDOMAIN which has absolute priority.
  79  *
  80  *
  81  * Return 0 if completes successfully, -1 on error
  82  */
  83 int
  84 res_init(void)
  85 {
  86         register FILE *fp;
  87         register char *cp, **pp;
  88         register int n;
  89         char buf[BUFSIZ];
  90 #ifdef SYSV
  91         extern char *strchr();
  92 #else
  93         extern char *index();
  94 #endif
  95         extern char *strcpy(), *strncpy();
  96         extern char *getenv();
  97         int nserv = 0;    /* number of nameserver records read from file */
  98         int haveenv = 0;
  99         int havesearch = 0;
 100 
 101         _res.nsaddr.sin_addr.s_addr =  htonl(INADDR_LOOPBACK); /* INADDR_ANY */
 102         _res.nsaddr.sin_family = AF_INET;
 103         _res.nsaddr.sin_port = htons(NAMESERVER_PORT);
 104         _res.nscount = 1;
 105 
 106 #ifdef SIOCGIFNUM
 107         {       int numifs, s, n, int_up;
 108                 struct ifconf ifc;
 109                 register struct ifreq *ifrp;
 110                 struct ifreq ifr;
 111                 unsigned bufsize;
 112                 unsigned int flags;
 113                 char *buf;
 114                 extern void *malloc();
 115 
 116                 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 117                         perror("socket");
 118                         return (-1);
 119                 }
 120                 if (ioctl(s, SIOCGIFNUM, (char *)&numifs) < 0) {
 121                         numifs = MAXIFS;
 122                 }
 123                 bufsize = numifs * sizeof (struct ifreq);
 124                 buf = (char *)malloc(bufsize);
 125                 if (buf == NULL) {
 126                         perror("out of memory");
 127                         close(s);
 128                         return (-1);
 129                 }
 130                 ifc.ifc_len = bufsize;
 131                 ifc.ifc_buf = buf;
 132                 if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
 133                         perror("ifconfig: SIOCGIFCONF");
 134                         close(s);
 135                         free(buf);
 136                         return (-1);
 137                 }
 138 
 139                 int_up = 0;
 140                 ifrp = ifc.ifc_req;
 141                 for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0;
 142                                                                 n--, ifrp++) {
 143                         memset((void *) &ifr, 0, sizeof (ifr));
 144                         strncpy(ifr.ifr_name, ifrp->ifr_name,
 145                                                         sizeof (ifr.ifr_name));
 146                         if (ioctl(s, SIOCGIFFLAGS, (char *)&ifr) < 0) {
 147                                 perror("SIOCGIFFLAGS");
 148                                 close(s);
 149                                 free(buf);
 150                                 return (-1);
 151                         }
 152                         flags = ifr.ifr_flags;
 153                         /* we are looking for a non-loopback interface */
 154                         if ((flags & IFF_UP) && ((flags & IFF_LOOPBACK) == 0))
 155                                 int_up = 1;
 156                 }
 157                 close(s);
 158                 free(buf);
 159                 if (int_up == 0) /* all the non-LOOPBACK interfaces are DOWN */
 160                         return (-1);
 161         }
 162 #endif /* SIOCGIFNUM */
 163 
 164 
 165         /*
 166          * for the benefit of hidden NIS domains, we use the same procedure
 167          * as sendmail: convert leading + to dot, then drop to first dot
 168          */
 169         getdomainname(buf, BUFSIZ);
 170         if (buf[0] == '+')
 171         buf[0] = '.';
 172 #ifdef SYSV
 173         cp = strchr(buf, (int)'.');
 174 #else
 175         cp = index(buf, '.');
 176 #endif
 177         if (cp == NULL)
 178                 strcpy(_res.defdname, buf);
 179         else
 180                 strcpy(_res.defdname, cp+1);
 181 
 182         /* Allow user to override the local domain definition */
 183         if ((cp = getenv("LOCALDOMAIN")) != NULL) {
 184         (void) strncpy(_res.defdname, cp, sizeof (_res.defdname));
 185         haveenv++;
 186         }
 187 
 188         if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
 189         /* read the config file */




   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2015 Gary Mills
  24  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  25  * Use is subject to license terms.
  26  */
  27 
  28 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T     */
  29 /*        All Rights Reserved   */
  30 
  31 /*
  32  * University Copyright- Copyright (c) 1982, 1986, 1988
  33  * The Regents of the University of California
  34  * All Rights Reserved
  35  *
  36  * University Acknowledgment- Portions of this document are derived from
  37  * software developed by the University of California, Berkeley, and its
  38  * contributors.
  39  */
  40 


  41 #include <sys/types.h>
  42 #include <sys/sockio.h>
  43 #include <sys/socket.h>
  44 #include <netinet/in.h>
  45 #include <stdio.h>
  46 #include <string.h>
  47 #include <stdlib.h>
  48 #include <unistd.h>
  49 #include <stropts.h>
  50 #include <arpa/nameser.h>
  51 #include <resolv.h>
  52 
  53 #include <netinet/in.h>
  54 #include <net/if.h>
  55 #include <netinet/if_ether.h>
  56 #include <arpa/inet.h>
  57 
  58 /*
  59  * Undocumented external function in libnsl
  60  */
  61 extern int
  62 getdomainname(char *, int);
  63 
  64 #define MAXIFS  256
  65 
  66 /*
  67  * Resolver state default settings
  68  */
  69 
  70 struct state _res = {
  71         RES_TIMEOUT,            /* retransmition time interval */
  72         4,                              /* number of times to retransmit */
  73         RES_DEFAULT,            /* options flags */
  74         1,                              /* number of name servers */
  75 };
  76 
  77 /*
  78  * Set up default settings.  If the configuration file exist, the values
  79  * there will have precedence.  Otherwise, the server address is set to
  80  * INADDR_LOOPBACK and the default domain name comes from the gethostname().
  81  * BUT if the NIS/RPC domain name is set, that is used if all else fails.
  82  *
  83  * The configuration file should only be used if you want to redefine your
  84  * domain or run without a server on your machine.
  85  *
  86  * Note the user can always override then domain name with the environment
  87  * variable LOCALDOMAIN which has absolute priority.
  88  *
  89  *
  90  * Return 0 if completes successfully, -1 on error
  91  */
  92 int
  93 res_init(void)
  94 {
  95         register FILE *fp;
  96         register char *cp, **pp;
  97         register int n;
  98         char buf[BUFSIZ];







  99         int nserv = 0;    /* number of nameserver records read from file */
 100         int haveenv = 0;
 101         int havesearch = 0;
 102 
 103         _res.nsaddr.sin_addr.s_addr =  htonl(INADDR_LOOPBACK); /* INADDR_ANY */
 104         _res.nsaddr.sin_family = AF_INET;
 105         _res.nsaddr.sin_port = htons(NAMESERVER_PORT);
 106         _res.nscount = 1;
 107 
 108 #ifdef SIOCGIFNUM
 109         {       int numifs, s, n, int_up;
 110                 struct ifconf ifc;
 111                 register struct ifreq *ifrp;
 112                 struct ifreq ifr;
 113                 unsigned bufsize;
 114                 unsigned int flags;
 115                 char *buf;

 116 
 117                 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 118                         perror("socket");
 119                         return (-1);
 120                 }
 121                 if (ioctl(s, SIOCGIFNUM, (char *)&numifs) < 0) {
 122                         numifs = MAXIFS;
 123                 }
 124                 bufsize = numifs * sizeof (struct ifreq);
 125                 buf = (char *)malloc(bufsize);
 126                 if (buf == NULL) {
 127                         perror("out of memory");
 128                         (void) close(s);
 129                         return (-1);
 130                 }
 131                 ifc.ifc_len = bufsize;
 132                 ifc.ifc_buf = buf;
 133                 if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
 134                         perror("ifconfig: SIOCGIFCONF");
 135                         (void) close(s);
 136                         free(buf);
 137                         return (-1);
 138                 }
 139 
 140                 int_up = 0;
 141                 ifrp = ifc.ifc_req;
 142                 for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0;
 143                                                                 n--, ifrp++) {
 144                         (void) memset((void *) &ifr, 0, sizeof (ifr));
 145                         strncpy(ifr.ifr_name, ifrp->ifr_name,
 146                                                         sizeof (ifr.ifr_name));
 147                         if (ioctl(s, SIOCGIFFLAGS, (char *)&ifr) < 0) {
 148                                 perror("SIOCGIFFLAGS");
 149                                 (void) close(s);
 150                                 free(buf);
 151                                 return (-1);
 152                         }
 153                         flags = ifr.ifr_flags;
 154                         /* we are looking for a non-loopback interface */
 155                         if ((flags & IFF_UP) && ((flags & IFF_LOOPBACK) == 0))
 156                                 int_up = 1;
 157                 }
 158                 (void) close(s);
 159                 free(buf);
 160                 if (int_up == 0) /* all the non-LOOPBACK interfaces are DOWN */
 161                         return (-1);
 162         }
 163 #endif /* SIOCGIFNUM */
 164 
 165 
 166         /*
 167          * for the benefit of hidden NIS domains, we use the same procedure
 168          * as sendmail: convert leading + to dot, then drop to first dot
 169          */
 170         (void) getdomainname(buf, BUFSIZ);
 171         if (buf[0] == '+')
 172                 buf[0] = '.';
 173 #ifdef SYSV
 174         cp = strchr(buf, (int)'.');
 175 #else
 176         cp = index(buf, '.');
 177 #endif
 178         if (cp == NULL)
 179                 strcpy(_res.defdname, buf);
 180         else
 181                 strcpy(_res.defdname, cp+1);
 182 
 183         /* Allow user to override the local domain definition */
 184         if ((cp = getenv("LOCALDOMAIN")) != NULL) {
 185         (void) strncpy(_res.defdname, cp, sizeof (_res.defdname));
 186         haveenv++;
 187         }
 188 
 189         if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
 190         /* read the config file */