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glibc  2.9
Classes | Defines | Functions | Variables
gethnamaddr.c File Reference
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <stdio.h>
#include <netdb.h>
#include <resolv.h>
#include <ctype.h>
#include <errno.h>
#include <syslog.h>
#include "../conf/portability.h"

Go to the source code of this file.

Classes

union  align

Defines

#define RESOLVSORT
#define LOG_AUTH   0
#define MULTI_PTRS_ARE_ALIASES   1 /* XXX - experimental */
#define SPRINTF(x)   ((size_t)sprintf x)
#define MAXALIASES   35
#define MAXADDRS   35
#define MAXPACKET   65536
#define MAXHOSTNAMELEN   256
#define Dprintf(msg, num)   /*nada*/
#define BOUNDED_INCR(x)
#define BOUNDS_CHECK(ptr, count)

Functions

static void map_v4v6_address (const char *src, char *dst) __THROW
static void map_v4v6_hostent (struct hostent *hp, char **bp, int *len) __THROW
void addrsort (char **, int)
static struct hostentgetanswer (const querybuf *answer, int anslen, const char *qname, int qtype)
struct hostentgethostbyname2 (const char *name, int af)
 libresolv_hidden_proto (gethostbyname2)
struct hostentgethostbyname2 (char *name, int af) const
 libresolv_hidden_def (gethostbyname2)
void _sethtent (int f)
 libresolv_hidden_def (_sethtent)
struct hostent_gethtent ()
 libresolv_hidden_def (_gethtent)
struct hostent_gethtbyname2 (char *name, int af) const
 libresolv_hidden_def (_gethtbyname2)
 libresolv_hidden_def (_gethtbyaddr)

Variables

static const char AskedForGot [] = "gethostby*.getanswer: asked for \"%s\", got \"%s\""
static char * h_addr_ptrs [MAXADDRS+1]
static struct hostent
static char * host_aliases [MAXALIASES]
static char hostbuf [8 *1024]
static u_char host_addr [16]
static FILEhostf = NULL
static int stayopen = 0
 querybuf
int h_errno

Class Documentation

union align

Definition at line 134 of file gethnamaddr.c.

Class Members
char ac
int32_t al

Define Documentation

#define BOUNDED_INCR (   x)
Value:
do { \
              cp += x; \
              if (cp > eom) { \
                     __set_h_errno (NO_RECOVERY); \
                     return (NULL); \
              } \
       } while (0)

Definition at line 160 of file gethnamaddr.c.

#define BOUNDS_CHECK (   ptr,
  count 
)
Value:
do { \
              if ((ptr) + (count) > eom) { \
                     __set_h_errno (NO_RECOVERY); \
                     return (NULL); \
              } \
       } while (0)

Definition at line 169 of file gethnamaddr.c.

#define Dprintf (   msg,
  num 
)    /*nada*/

Definition at line 157 of file gethnamaddr.c.

#define LOG_AUTH   0

Definition at line 73 of file gethnamaddr.c.

#define MAXADDRS   35

Definition at line 96 of file gethnamaddr.c.

#define MAXALIASES   35

Definition at line 95 of file gethnamaddr.c.

#define MAXHOSTNAMELEN   256
#define MAXPACKET   65536
#define MULTI_PTRS_ARE_ALIASES   1 /* XXX - experimental */

Definition at line 76 of file gethnamaddr.c.

#define RESOLVSORT

Definition at line 70 of file gethnamaddr.c.

#define SPRINTF (   x)    ((size_t)sprintf x)

Definition at line 92 of file gethnamaddr.c.


Function Documentation

struct hostent* _gethtbyname2 ( char *  name,
int  af 
) const [read]

Definition at line 887 of file gethnamaddr.c.

{
       register struct hostent *p;
       register char **cp;

       _sethtent(0);
       while ((p = _gethtent())) {
              if (p->h_addrtype != af)
                     continue;
              if (strcasecmp(p->h_name, name) == 0)
                     break;
              for (cp = p->h_aliases; *cp != 0; cp++)
                     if (strcasecmp(*cp, name) == 0)
                            goto found;
       }
 found:
       _endhtent();
       return (p);
}

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struct hostent* _gethtent ( ) [read]

Definition at line 807 of file gethnamaddr.c.

{
       char *p;
       register char *cp, **q;
       int af, len;

       if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) {
              __set_h_errno (NETDB_INTERNAL);
              return (NULL);
       }
 again:
       if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) {
              __set_h_errno (HOST_NOT_FOUND);
              return (NULL);
       }
       if (*p == '#')
              goto again;
       if (!(cp = strpbrk(p, "#\n")))
              goto again;
       *cp = '\0';
       if (!(cp = strpbrk(p, " \t")))
              goto again;
       *cp++ = '\0';
       if (inet_pton(AF_INET6, p, host_addr) > 0) {
              af = AF_INET6;
              len = IN6ADDRSZ;
       } else if (inet_pton(AF_INET, p, host_addr) > 0) {
              if (_res.options & RES_USE_INET6) {
                     map_v4v6_address((char*)host_addr, (char*)host_addr);
                     af = AF_INET6;
                     len = IN6ADDRSZ;
              } else {
                     af = AF_INET;
                     len = INADDRSZ;
              }
       } else {
              goto again;
       }
       h_addr_ptrs[0] = (char *)host_addr;
       h_addr_ptrs[1] = NULL;
       host.h_addr_list = h_addr_ptrs;
       host.h_length = len;
       host.h_addrtype = af;
       while (*cp == ' ' || *cp == '\t')
              cp++;
       host.h_name = cp;
       q = host.h_aliases = host_aliases;
       if ((cp = strpbrk(cp, " \t")))
              *cp++ = '\0';
       while (cp && *cp) {
              if (*cp == ' ' || *cp == '\t') {
                     cp++;
                     continue;
              }
              if (q < &host_aliases[MAXALIASES - 1])
                     *q++ = cp;
              if ((cp = strpbrk(cp, " \t")))
                     *cp++ = '\0';
       }
       *q = NULL;
       __set_h_errno (NETDB_SUCCESS);
       return (&host);
}

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void _sethtent ( int  f)

Definition at line 786 of file gethnamaddr.c.

{
       if (!hostf)
              hostf = fopen(_PATH_HOSTS, "r" );
       else
              rewind(hostf);
       stayopen = f;
}

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static void addrsort ( char **  ap,
int  num 
)

Definition at line 114 of file gethnamaddr.c.

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static struct hostent* getanswer ( const querybuf answer,
int  anslen,
const char *  qname,
int  qtype 
) [static, read]

Definition at line 179 of file gethnamaddr.c.

{
       register const HEADER *hp;
       register const u_char *cp;
       register int n;
       const u_char *eom, *erdata;
       char *bp, **ap, **hap;
       int type, class, buflen, ancount, qdcount;
       int haveanswer, had_error;
       int toobig = 0;
       char tbuf[MAXDNAME];
       const char *tname;
       int (*name_ok) (const char *);

       tname = qname;
       host.h_name = NULL;
       eom = answer->buf + anslen;
       switch (qtype) {
       case T_A:
       case T_AAAA:
              name_ok = res_hnok;
              break;
       case T_PTR:
              name_ok = res_dnok;
              break;
       default:
              return (NULL);       /* XXX should be abort(); */
       }
       /*
        * find first satisfactory answer
        */
       hp = &answer->hdr;
       ancount = ntohs(hp->ancount);
       qdcount = ntohs(hp->qdcount);
       bp = hostbuf;
       buflen = sizeof hostbuf;
       cp = answer->buf;
       BOUNDED_INCR(HFIXEDSZ);
       if (qdcount != 1) {
              __set_h_errno (NO_RECOVERY);
              return (NULL);
       }
       n = dn_expand(answer->buf, eom, cp, bp, buflen);
       if ((n < 0) || !(*name_ok)(bp)) {
              __set_h_errno (NO_RECOVERY);
              return (NULL);
       }
       BOUNDED_INCR(n + QFIXEDSZ);
       if (qtype == T_A || qtype == T_AAAA) {
              /* res_send() has already verified that the query name is the
               * same as the one we sent; this just gets the expanded name
               * (i.e., with the succeeding search-domain tacked on).
               */
              n = strlen(bp) + 1;         /* for the \0 */
              if (n >= MAXHOSTNAMELEN) {
                     __set_h_errno (NO_RECOVERY);
                     return (NULL);
              }
              host.h_name = bp;
              bp += n;
              buflen -= n;
              /* The qname can be abbreviated, but h_name is now absolute. */
              qname = host.h_name;
       }
       ap = host_aliases;
       *ap = NULL;
       host.h_aliases = host_aliases;
       hap = h_addr_ptrs;
       *hap = NULL;
       host.h_addr_list = h_addr_ptrs;
       haveanswer = 0;
       had_error = 0;
       while (ancount-- > 0 && cp < eom && !had_error) {
              n = dn_expand(answer->buf, eom, cp, bp, buflen);
              if ((n < 0) || !(*name_ok)(bp)) {
                     had_error++;
                     continue;
              }
              cp += n;                    /* name */
              BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ);
              type = ns_get16(cp);
              cp += INT16SZ;                     /* type */
              class = ns_get16(cp);
              cp += INT16SZ + INT32SZ;    /* class, TTL */
              n = ns_get16(cp);
              cp += INT16SZ;                     /* len */
              BOUNDS_CHECK(cp, n);
              erdata = cp + n;
              if (class != C_IN) {
                     /* XXX - debug? syslog? */
                     cp += n;
                     continue;            /* XXX - had_error++ ? */
              }
              if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) {
                     if (ap >= &host_aliases[MAXALIASES-1])
                            continue;
                     n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
                     if ((n < 0) || !(*name_ok)(tbuf)) {
                            had_error++;
                            continue;
                     }
                     cp += n;
                     if (cp != erdata) {
                            __set_h_errno (NO_RECOVERY);
                            return (NULL);
                     }
                     /* Store alias. */
                     *ap++ = bp;
                     n = strlen(bp) + 1;  /* for the \0 */
                     if (n >= MAXHOSTNAMELEN) {
                            had_error++;
                            continue;
                     }
                     bp += n;
                     buflen -= n;
                     /* Get canonical name. */
                     n = strlen(tbuf) + 1;       /* for the \0 */
                     if (n > buflen || n >= MAXHOSTNAMELEN) {
                            had_error++;
                            continue;
                     }
                     strcpy(bp, tbuf);
                     host.h_name = bp;
                     bp += n;
                     buflen -= n;
                     continue;
              }
              if (qtype == T_PTR && type == T_CNAME) {
                     n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
                     if (n < 0 || !res_dnok(tbuf)) {
                            had_error++;
                            continue;
                     }
                     cp += n;
                     if (cp != erdata) {
                            __set_h_errno (NO_RECOVERY);
                            return (NULL);
                     }
                     /* Get canonical name. */
                     n = strlen(tbuf) + 1;       /* for the \0 */
                     if (n > buflen || n >= MAXHOSTNAMELEN) {
                            had_error++;
                            continue;
                     }
                     strcpy(bp, tbuf);
                     tname = bp;
                     bp += n;
                     buflen -= n;
                     continue;
              }
              if ((type == T_SIG) || (type == T_KEY) || (type == T_NXT)) {
                     /* We don't support DNSSEC yet.  For now, ignore
                      * the record and send a low priority message
                      * to syslog.
                      */
                     syslog(LOG_DEBUG|LOG_AUTH,
              "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
                            qname, p_class(C_IN), p_type(qtype),
                            p_type(type));
                     cp += n;
                     continue;
              }
              if (type != qtype) {
                     syslog(LOG_NOTICE|LOG_AUTH,
              "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
                            qname, p_class(C_IN), p_type(qtype),
                            p_type(type));
                     cp += n;
                     continue;            /* XXX - had_error++ ? */
              }
              switch (type) {
              case T_PTR:
                     if (strcasecmp(tname, bp) != 0) {
                            syslog(LOG_NOTICE|LOG_AUTH,
                                   AskedForGot, qname, bp);
                            cp += n;
                            continue;     /* XXX - had_error++ ? */
                     }
                     n = dn_expand(answer->buf, eom, cp, bp, buflen);
                     if ((n < 0) || !res_hnok(bp)) {
                            had_error++;
                            break;
                     }
#if MULTI_PTRS_ARE_ALIASES
                     cp += n;
                     if (cp != erdata) {
                            __set_h_errno (NO_RECOVERY);
                            return (NULL);
                     }
                     if (!haveanswer)
                            host.h_name = bp;
                     else if (ap < &host_aliases[MAXALIASES-1])
                            *ap++ = bp;
                     else
                            n = -1;
                     if (n != -1) {
                            n = strlen(bp) + 1;  /* for the \0 */
                            if (n >= MAXHOSTNAMELEN) {
                                   had_error++;
                                   break;
                            }
                            bp += n;
                            buflen -= n;
                     }
                     break;
#else
                     host.h_name = bp;
                     if (_res.options & RES_USE_INET6) {
                            n = strlen(bp) + 1;  /* for the \0 */
                            if (n >= MAXHOSTNAMELEN) {
                                   had_error++;
                                   break;
                            }
                            bp += n;
                            buflen -= n;
                            map_v4v6_hostent(&host, &bp, &buflen);
                     }
                     __set_h_errno (NETDB_SUCCESS);
                     return (&host);
#endif
              case T_A:
              case T_AAAA:
                     if (strcasecmp(host.h_name, bp) != 0) {
                            syslog(LOG_NOTICE|LOG_AUTH,
                                   AskedForGot, host.h_name, bp);
                            cp += n;
                            continue;     /* XXX - had_error++ ? */
                     }
                     if (n != host.h_length) {
                            cp += n;
                            continue;
                     }
                     if (!haveanswer) {
                            register int nn;

                            host.h_name = bp;
                            nn = strlen(bp) + 1; /* for the \0 */
                            bp += nn;
                            buflen -= nn;
                     }

                     /* XXX: when incrementing bp, we have to decrement
                      * buflen by the same amount --okir */
                     buflen -= sizeof(align) - ((u_long)bp % sizeof(align));

                     bp += sizeof(align) - ((u_long)bp % sizeof(align));

                     if (bp + n >= &hostbuf[sizeof hostbuf]) {
                            Dprintf("size (%d) too big\n", n);
                            had_error++;
                            continue;
                     }
                     if (hap >= &h_addr_ptrs[MAXADDRS-1]) {
                            if (!toobig++) {
                                   Dprintf("Too many addresses (%d)\n",
                                          MAXADDRS);
                            }
                            cp += n;
                            continue;
                     }
                     memmove(*hap++ = bp, cp, n);
                     bp += n;
                     buflen -= n;
                     cp += n;
                     if (cp != erdata) {
                            __set_h_errno (NO_RECOVERY);
                            return (NULL);
                     }
                     break;
              default:
                     abort();
              }
              if (!had_error)
                     haveanswer++;
       }
       if (haveanswer) {
              *ap = NULL;
              *hap = NULL;
# if defined(RESOLVSORT)
              /*
               * Note: we sort even if host can take only one address
               * in its return structures - should give it the "best"
               * address in that case, not some random one
               */
              if (_res.nsort && haveanswer > 1 && qtype == T_A)
                     addrsort(h_addr_ptrs, haveanswer);
# endif /*RESOLVSORT*/
              if (!host.h_name) {
                     n = strlen(qname) + 1;      /* for the \0 */
                     if (n > buflen || n >= MAXHOSTNAMELEN)
                            goto no_recovery;
                     strcpy(bp, qname);
                     host.h_name = bp;
                     bp += n;
                     buflen -= n;
              }
              if (_res.options & RES_USE_INET6)
                     map_v4v6_hostent(&host, &bp, &buflen);
              __set_h_errno (NETDB_SUCCESS);
              return (&host);
       }
 no_recovery:
       __set_h_errno (NO_RECOVERY);
       return (NULL);
}

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struct hostent* gethostbyname2 ( const char *  name,
int  af 
) [read]

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struct hostent* gethostbyname2 ( char *  name,
int  af 
) const [read]

Definition at line 507 of file gethnamaddr.c.

{
       union
       {
         querybuf *buf;
         u_char *ptr;
       } buf;
       querybuf *origbuf;
       register const char *cp;
       char *bp;
       int n, size, type, len;
       struct hostent *ret;

       if (__res_maybe_init (&_res, 0) == -1) {
              __set_h_errno (NETDB_INTERNAL);
              return (NULL);
       }

       switch (af) {
       case AF_INET:
              size = INADDRSZ;
              type = T_A;
              break;
       case AF_INET6:
              size = IN6ADDRSZ;
              type = T_AAAA;
              break;
       default:
              __set_h_errno (NETDB_INTERNAL);
              __set_errno (EAFNOSUPPORT);
              return (NULL);
       }

       host.h_addrtype = af;
       host.h_length = size;

       /*
        * if there aren't any dots, it could be a user-level alias.
        * this is also done in res_query() since we are not the only
        * function that looks up host names.
        */
       if (!strchr(name, '.') && (cp = __hostalias(name)))
              name = cp;

       /*
        * disallow names consisting only of digits/dots, unless
        * they end in a dot.
        */
       if (isdigit(name[0]))
              for (cp = name;; ++cp) {
                     if (!*cp) {
                            if (*--cp == '.')
                                   break;
                            /*
                             * All-numeric, no dot at the end.
                             * Fake up a hostent as if we'd actually
                             * done a lookup.
                             */
                            if (inet_pton(af, name, host_addr) <= 0) {
                                   __set_h_errno (HOST_NOT_FOUND);
                                   return (NULL);
                            }
                            strncpy(hostbuf, name, MAXDNAME);
                            hostbuf[MAXDNAME] = '\0';
                            bp = hostbuf + MAXDNAME;
                            len = sizeof hostbuf - MAXDNAME;
                            host.h_name = hostbuf;
                            host.h_aliases = host_aliases;
                            host_aliases[0] = NULL;
                            h_addr_ptrs[0] = (char *)host_addr;
                            h_addr_ptrs[1] = NULL;
                            host.h_addr_list = h_addr_ptrs;
                            if (_res.options & RES_USE_INET6)
                                   map_v4v6_hostent(&host, &bp, &len);
                            __set_h_errno (NETDB_SUCCESS);
                            return (&host);
                     }
                     if (!isdigit(*cp) && *cp != '.')
                            break;
               }
       if ((isxdigit(name[0]) && strchr(name, ':') != NULL) ||
           name[0] == ':')
              for (cp = name;; ++cp) {
                     if (!*cp) {
                            if (*--cp == '.')
                                   break;
                            /*
                             * All-IPv6-legal, no dot at the end.
                             * Fake up a hostent as if we'd actually
                             * done a lookup.
                             */
                            if (inet_pton(af, name, host_addr) <= 0) {
                                   __set_h_errno (HOST_NOT_FOUND);
                                   return (NULL);
                            }
                            strncpy(hostbuf, name, MAXDNAME);
                            hostbuf[MAXDNAME] = '\0';
                            bp = hostbuf + MAXDNAME;
                            len = sizeof hostbuf - MAXDNAME;
                            host.h_name = hostbuf;
                            host.h_aliases = host_aliases;
                            host_aliases[0] = NULL;
                            h_addr_ptrs[0] = (char *)host_addr;
                            h_addr_ptrs[1] = NULL;
                            host.h_addr_list = h_addr_ptrs;
                            __set_h_errno (NETDB_SUCCESS);
                            return (&host);
                     }
                     if (!isxdigit(*cp) && *cp != ':' && *cp != '.')
                            break;
              }

       buf.buf = origbuf = (querybuf *) alloca (1024);

       if ((n = __libc_res_nsearch(&_res, name, C_IN, type, buf.buf->buf, 1024,
                                &buf.ptr, NULL, NULL, NULL)) < 0) {
              if (buf.buf != origbuf)
                     free (buf.buf);
              Dprintf("res_nsearch failed (%d)\n", n);
              if (errno == ECONNREFUSED)
                     return (_gethtbyname2(name, af));
              return (NULL);
       }
       ret = getanswer(buf.buf, n, name, type);
       if (buf.buf != origbuf)
              free (buf.buf);
       return ret;
}

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Definition at line 637 of file gethnamaddr.c.

{
       const u_char *uaddr = (const u_char *)addr;
       static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff };
       static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 };
       int n;
       socklen_t size;
       union
       {
         querybuf *buf;
         u_char *ptr;
       } buf;
       querybuf *orig_buf;
       register struct hostent *hp;
       char qbuf[MAXDNAME+1], *qp = NULL;
#ifdef SUNSECURITY
       register struct hostent *rhp;
       char **haddr;
       u_long old_options;
       char hname2[MAXDNAME+1];
#endif /*SUNSECURITY*/

       if (__res_maybe_init (&_res, 0) == -1) {
              __set_h_errno (NETDB_INTERNAL);
              return (NULL);
       }
       if (af == AF_INET6 && len == IN6ADDRSZ &&
           (!bcmp(uaddr, mapped, sizeof mapped) ||
            !bcmp(uaddr, tunnelled, sizeof tunnelled))) {
              /* Unmap. */
              addr += sizeof mapped;
              uaddr += sizeof mapped;
              af = AF_INET;
              len = INADDRSZ;
       }
       switch (af) {
       case AF_INET:
              size = INADDRSZ;
              break;
       case AF_INET6:
              size = IN6ADDRSZ;
              break;
       default:
              __set_errno (EAFNOSUPPORT);
              __set_h_errno (NETDB_INTERNAL);
              return (NULL);
       }
       if (size != len) {
              __set_errno (EINVAL);
              __set_h_errno (NETDB_INTERNAL);
              return (NULL);
       }
       switch (af) {
       case AF_INET:
              (void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa",
                            (uaddr[3] & 0xff),
                            (uaddr[2] & 0xff),
                            (uaddr[1] & 0xff),
                            (uaddr[0] & 0xff));
              break;
       case AF_INET6:
              qp = qbuf;
              for (n = IN6ADDRSZ - 1; n >= 0; n--) {
                     qp += SPRINTF((qp, "%x.%x.",
                                   uaddr[n] & 0xf,
                                   (uaddr[n] >> 4) & 0xf));
              }
              strcpy(qp, "ip6.arpa");
              break;
       default:
              abort();
       }

       buf.buf = orig_buf = (querybuf *) alloca (1024);

       n = __libc_res_nquery(&_res, qbuf, C_IN, T_PTR, buf.buf->buf, 1024,
                           &buf.ptr, NULL, NULL, NULL);
       if (n < 0 && af == AF_INET6 && (_res.options & RES_NOIP6DOTINT) == 0) {
              strcpy(qp, "ip6.int");
              n = __libc_res_nquery(&_res, qbuf, C_IN, T_PTR, buf.buf->buf,
                                  buf.buf != orig_buf ? MAXPACKET : 1024,
                                  &buf.ptr, NULL, NULL, NULL);
       }
       if (n < 0) {
              if (buf.buf != orig_buf)
                     free (buf.buf);
              Dprintf("res_nquery failed (%d)\n", n);
              if (errno == ECONNREFUSED)
                     return (_gethtbyaddr(addr, len, af));
              return (NULL);
       }
       hp = getanswer(buf.buf, n, qbuf, T_PTR);
       if (buf.buf != orig_buf)
              free (buf.buf);
       if (!hp)
              return (NULL);       /* h_errno was set by getanswer() */
#ifdef SUNSECURITY
       if (af == AF_INET) {
           /*
            * turn off search as the name should be absolute,
            * 'localhost' should be matched by defnames
            */
           strncpy(hname2, hp->h_name, MAXDNAME);
           hname2[MAXDNAME] = '\0';
           old_options = _res.options;
           _res.options &= ~RES_DNSRCH;
           _res.options |= RES_DEFNAMES;
           if (!(rhp = gethostbyname(hname2))) {
              syslog(LOG_NOTICE|LOG_AUTH,
                     "gethostbyaddr: No A record for %s (verifying [%s])",
                     hname2, inet_ntoa(*((struct in_addr *)addr)));
              _res.options = old_options;
              __set_h_errno (HOST_NOT_FOUND);
              return (NULL);
           }
           _res.options = old_options;
           for (haddr = rhp->h_addr_list; *haddr; haddr++)
              if (!memcmp(*haddr, addr, INADDRSZ))
                     break;
           if (!*haddr) {
              syslog(LOG_NOTICE|LOG_AUTH,
                     "gethostbyaddr: A record of %s != PTR record [%s]",
                     hname2, inet_ntoa(*((struct in_addr *)addr)));
              __set_h_errno (HOST_NOT_FOUND);
              return (NULL);
           }
       }
#endif /*SUNSECURITY*/
       hp->h_addrtype = af;
       hp->h_length = len;
       memmove(host_addr, addr, len);
       h_addr_ptrs[0] = (char *)host_addr;
       h_addr_ptrs[1] = NULL;
       if (af == AF_INET && (_res.options & RES_USE_INET6)) {
              map_v4v6_address((char*)host_addr, (char*)host_addr);
              hp->h_addrtype = AF_INET6;
              hp->h_length = IN6ADDRSZ;
       }
       __set_h_errno (NETDB_SUCCESS);
       return (hp);
}

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Definition at line 795 of file gethnamaddr.c.

{
       if (hostf && !stayopen) {
              (void) fclose(hostf);
              hostf = NULL;
       }
}

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Definition at line 870 of file gethnamaddr.c.

{
       struct hostent *hp;

       if (_res.options & RES_USE_INET6) {
              hp = _gethtbyname2(name, AF_INET6);
              if (hp)
                     return (hp);
       }
       return (_gethtbyname2(name, AF_INET));
}

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Definition at line 908 of file gethnamaddr.c.

{
       register struct hostent *p;

       _sethtent(0);
       while ((p = _gethtent()))
              if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len))
                     break;
       _endhtent();
       return (p);
}

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libresolv_hidden_def ( _gethtbyaddr  )

Definition at line 925 of file gethnamaddr.c.

{
       u_char *p = (u_char *)dst;
       char tmp[INADDRSZ];
       int i;

       /* Stash a temporary copy so our caller can update in place. */
       memcpy(tmp, src, INADDRSZ);
       /* Mark this ipv6 addr as a mapped ipv4. */
       for (i = 0; i < 10; i++)
              *p++ = 0x00;
       *p++ = 0xff;
       *p++ = 0xff;
       /* Retrieve the saved copy and we're done. */
       memcpy((void*)p, tmp, INADDRSZ);
}

Definition at line 486 of file gethnamaddr.c.

{
       struct hostent *hp;

       if (__res_maybe_init (&_res, 0) == -1) {
              __set_h_errno (NETDB_INTERNAL);
              return (NULL);
       }
       if (_res.options & RES_USE_INET6) {
              hp = gethostbyname2(name, AF_INET6);
              if (hp)
                     return (hp);
       }
       return (gethostbyname2(name, AF_INET));
}

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static void map_v4v6_address ( const char *  src,
char *  dst 
) [static]

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static void map_v4v6_hostent ( struct hostent hp,
char **  bp,
int len 
) [static]

Definition at line 948 of file gethnamaddr.c.

{
       char **ap;

       if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ)
              return;
       hp->h_addrtype = AF_INET6;
       hp->h_length = IN6ADDRSZ;
       for (ap = hp->h_addr_list; *ap; ap++) {
              int i = sizeof(align) - ((u_long)*bpp % sizeof(align));

              if (*lenp < (i + IN6ADDRSZ)) {
                     /* Out of memory.  Truncate address list here.  XXX */
                     *ap = NULL;
                     return;
              }
              *bpp += i;
              *lenp -= i;
              map_v4v6_address(*ap, *bpp);
              *ap = *bpp;
              *bpp += IN6ADDRSZ;
              *lenp -= IN6ADDRSZ;
       }
}

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Variable Documentation

const char AskedForGot[] = "gethostby*.getanswer: asked for \"%s\", got \"%s\"" [static]

Definition at line 98 of file gethnamaddr.c.

char* h_addr_ptrs[MAXADDRS+1] [static]

Definition at line 101 of file gethnamaddr.c.

u_char host_addr[16] [static]

Definition at line 106 of file gethnamaddr.c.

char* host_aliases[MAXALIASES] [static]

Definition at line 104 of file gethnamaddr.c.

char hostbuf[8 *1024] [static]

Definition at line 105 of file gethnamaddr.c.

struct hostent [static]

Definition at line 103 of file gethnamaddr.c.

FILE* hostf = NULL [static]

Definition at line 107 of file gethnamaddr.c.

Definition at line 132 of file gethnamaddr.c.

int stayopen = 0 [static]

Definition at line 108 of file gethnamaddr.c.