whois iOS

whois.c

/*-
 * Copyright (c) 1980, 1993
 *  The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1980, 1993\n\
The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#if 0
#ifndef lint
static char sccsid[] = "@(#)whois.c  8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#endif

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: head/usr.bin/whois/whois.c 300678 2016-05-25 13:09:06Z fanf $");

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/poll.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
//#include <err.h>
#include <netdb.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "ios_error.h"

#ifdef __APPLE__
#ifndef SOCK_NONBLOCK
#define SOCK_NONBLOCK 0
#endif
#ifndef INFTIM
#define INFTIM -1
#endif
#endif

#define  ABUSEHOST  "whois.abuse.net"
#define  ANICHOST  "whois.arin.net"
#define  DENICHOST  "whois.denic.de"
#define  DKNICHOST  "whois.dk-hostmaster.dk"
#define  FNICHOST  "whois.afrinic.net"
#define  GNICHOST  "whois.nic.gov"
#define  IANAHOST  "whois.iana.org"
#define  INICHOST  "whois.internic.net"
#define  KNICHOST  "whois.krnic.net"
#define  LNICHOST  "whois.lacnic.net"
#define  MNICHOST  "whois.ra.net"
#define  PDBHOST    "whois.peeringdb.com"
#define  PNICHOST  "whois.apnic.net"
#define  QNICHOST_TAIL  ".whois-servers.net"
#define  RNICHOST  "whois.ripe.net"
#define  VNICHOST  "whois.verisign-grs.com"

#ifdef __APPLE__
#define  DEFAULT_PORT  "nicname"
#else
#define  DEFAULT_PORT  "whois"
#endif

#define WHOIS_RECURSE  0x01
#define WHOIS_QUICK  0x02
#define WHOIS_SPAM_ME  0x04

#define CHOPSPAM  ">>> Last update of WHOIS database:"

#define ishost(h) (isalnum((unsigned char)h) || h == '.' || h == '-')

#define SCAN(p, end, check)          \
while ((p) < (end))          \
if (check) ++(p);        \
else break

static struct {
  const char *suffix, *server;
} whoiswhere[] = {
  /* Various handles */
  { "-ARIN", ANICHOST },
  { "-NICAT", "at" QNICHOST_TAIL },
  { "-NORID", "no" QNICHOST_TAIL },
  { "-RIPE", RNICHOST },
  /* Nominet's whois server doesn't return referrals to JANET */
  { ".ac.uk", "ac.uk" QNICHOST_TAIL },
  { ".gov.uk", "ac.uk" QNICHOST_TAIL },
  { "", IANAHOST }, /* default */
  { NULL, NULL } /* safety belt */
};

#define WHOIS_REFERRAL(s) { s, sizeof(s) - 1 }
static struct {
  const char *prefix;
  size_t len;
} whois_referral[] = {
  WHOIS_REFERRAL("whois:"), /* IANA */
  WHOIS_REFERRAL("Whois Server:"),
  WHOIS_REFERRAL("Registrar WHOIS Server:"), /* corporatedomains.com */
  WHOIS_REFERRAL("ReferralServer:  whois://"), /* ARIN */
  WHOIS_REFERRAL("descr:          region. Please query"), /* AfriNIC */
  { NULL, 0 }
};

static const char *actually_arin[] = {
  "netname:        ERX-NETBLOCK\n", /* APNIC */
  "netname:        NON-RIPE-NCC-MANAGED-ADDRESS-BLOCK\n",
  NULL
};

static const char *port = DEFAULT_PORT;

static const char *choose_server(char *);
static struct addrinfo *gethostinfo(char const *host, int exitnoname);
#ifdef __APPLE__
static void s_asprintf(char **ret, const char *format, ...) __attribute__((__format__(printf, 2, 3)));
#else
static void s_asprintf(char **ret, const char *format, ...) __printflike(2, 3);
#endif
static void usage(void);
static void whois(const char *, const char *, int);

int
whois_main(int argc, char *argv[])
{
  const char *country, *host;
  int ch, flags;
  
#ifdef  SOCKS
  SOCKSinit(argv[0]);
#endif
  
  country = host = NULL;
  flags = 0;
  while ((ch = getopt(argc, argv, "aAbc:fgh:iIklmp:PQrRS")) != -1) {
    switch (ch) {
      case 'a':
        host = ANICHOST;
        break;
      case 'A':
        host = PNICHOST;
        break;
      case 'b':
        host = ABUSEHOST;
        break;
      case 'c':
        country = optarg;
        break;
      case 'f':
        host = FNICHOST;
        break;
      case 'g':
        host = GNICHOST;
        break;
      case 'h':
        host = optarg;
        break;
      case 'i':
        host = INICHOST;
        break;
      case 'I':
        host = IANAHOST;
        break;
      case 'k':
        host = KNICHOST;
        break;
      case 'l':
        host = LNICHOST;
        break;
      case 'm':
        host = MNICHOST;
        break;
      case 'p':
        port = optarg;
        break;
      case 'P':
        host = PDBHOST;
        break;
      case 'Q':
        flags |= WHOIS_QUICK;
        break;
      case 'r':
        host = RNICHOST;
        break;
      case 'R':
        flags |= WHOIS_RECURSE;
        break;
      case 'S':
        flags |= WHOIS_SPAM_ME;
        break;
      case '?':
      default:
        usage();
        /* NOTREACHED */
    }
  }
  argc -= optind;
  argv += optind;
  
  if (!argc || (country != NULL && host != NULL))
    usage();
  
  /*
   * If no host or country is specified, rely on referrals from IANA.
   */
  if (host == NULL && country == NULL) {
    if ((host = getenv("WHOIS_SERVER")) == NULL &&
        (host = getenv("RA_SERVER")) == NULL) {
      if (!(flags & WHOIS_QUICK))
        flags |= WHOIS_RECURSE;
    }
  }
  while (argc-- > 0) {
    if (country != NULL) {
      char *qnichost;
      s_asprintf(&qnichost, "%s%s", country, QNICHOST_TAIL);
      whois(*argv, qnichost, flags);
      free(qnichost);
    } else
      whois(*argv, host != NULL ? host :
            choose_server(*argv), flags);
    argv++;
  }
  exit(0);
}

static const char *
choose_server(char *domain)
{
  size_t len = strlen(domain);
  int i;
  
  for (i = 0; whoiswhere[i].suffix != NULL; i++) {
    size_t suffix_len = strlen(whoiswhere[i].suffix);
    if (len > suffix_len &&
        strcasecmp(domain + len - suffix_len,
                   whoiswhere[i].suffix) == 0)
      return (whoiswhere[i].server);
  }
  //errx(EX_SOFTWARE, "no default whois server");
  fprintf(thread_stderr, "no default whois server");
  ios_exit(EX_SOFTWARE);
}

static struct addrinfo *
gethostinfo(char const *host, int exit_on_noname)
{
  struct addrinfo hints, *res;
  int error;
  
  memset(&hints, 0, sizeof(hints));
  hints.ai_flags = AI_CANONNAME;
  hints.ai_family = AF_UNSPEC;
  hints.ai_socktype = SOCK_STREAM;
  res = NULL;
  error = getaddrinfo(host, port, &hints, &res);
  if (error && (exit_on_noname || error != EAI_NONAME)) {
//    err(EX_NOHOST, "%s: %s", host, gai_strerror(error));
    fprintf(thread_stderr, "%s: %s", host, gai_strerror(error));
    ios_exit(EX_NOHOST);
  }
  return (res);
}

/*
 * Wrapper for asprintf(3) that exits on error.
 */
static void
s_asprintf(char **ret, const char *format, ...)
{
  va_list ap;
  va_start(ap, format);
  if (vasprintf(ret, format, ap) == -1) {
    va_end(ap);
    // err(EX_OSERR, "vasprintf()");
    fprintf(thread_stderr, "vasprintf()");
    ios_exit(EX_OSERR);
  }
  va_end(ap);
}

static int
connect_to_any_host(struct addrinfo *hostres)
{
  struct addrinfo *res;
  nfds_t i, j;
  size_t count;
  struct pollfd *fds;
  int timeout = 180, s = -1;
  
  for (res = hostres, count = 0; res; res = res->ai_next)
    count++;
  fds = calloc(count, sizeof(*fds));
  if (fds == NULL) {
    // err(EX_OSERR, "calloc()");
    fprintf(thread_stderr, "calloc()");
    ios_exit(EX_OSERR);
  }
  
  /*
   * Traverse the result list elements and make non-block
   * connection attempts.
   */
  count = i = 0;
  for (res = hostres; res != NULL; res = res->ai_next) {
    s = socket(res->ai_family, res->ai_socktype | SOCK_NONBLOCK,
               res->ai_protocol);
    if (s < 0)
      continue;
#ifdef __APPLE__
    int flags = fcntl(s, F_GETFL, 0);
    if (flags < 0) {
      close(s);
      continue;
    }
    flags |= O_NONBLOCK;
    if (fcntl(s, F_SETFL, flags) != 0) {
      close(s);
      continue;
    }
#endif
    if (connect(s, res->ai_addr, res->ai_addrlen) < 0) {
      if (errno == EINPROGRESS) {
        /* Add the socket to poll list */
        fds[i].fd = s;
        fds[i].events = POLLERR | POLLHUP |
        POLLIN | POLLOUT;
        /*
         * From here until a socket connects, the
         * socket fd is owned by the fds[] poll array.
         */
        s = -1;
        count++;
        i++;
      } else {
        close(s);
        s = -1;
        
        /*
         * Poll only if we have something to poll,
         * otherwise just go ahead and try next
         * address
         */
        if (count == 0)
          continue;
      }
    } else
      goto done;
    
    /*
     * If we are at the last address, poll until a connection is
     * established or we failed all connection attempts.
     */
    if (res->ai_next == NULL)
      timeout = INFTIM;
    
    /*
     * Poll the watched descriptors for successful connections:
     * if we still have more untried resolved addresses, poll only
     * once; otherwise, poll until all descriptors have errors,
     * which will be considered as ETIMEDOUT later.
     */
    do {
      int n;
      
      n = poll(fds, i, timeout);
      if (n == 0) {
        /*
         * No event reported in time.  Try with a
         * smaller timeout (but cap at 2-3ms)
         * after a new host have been added.
         */
        if (timeout >= 3)
          timeout >>= 1;
        
        break;
      } else if (n < 0) {
        /*
         * errno here can only be EINTR which we would
         * want to clean up and bail out.
         */
        s = -1;
        goto done;
      }
      
      /*
       * Check for the event(s) we have seen.
       */
      for (j = 0; j < i; j++) {
        if (fds[j].fd == -1 || fds[j].events == 0 ||
            fds[j].revents == 0)
          continue;
        if (fds[j].revents & ~(POLLIN | POLLOUT)) {
          close(fds[j].fd);
          fds[j].fd = -1;
          fds[j].events = 0;
          count--;
          continue;
        } else if (fds[j].revents & (POLLIN | POLLOUT)) {
          /* Connect succeeded. */
          s = fds[j].fd;
          fds[j].fd = -1;
          
          goto done;
        }
        
      }
    } while (timeout == INFTIM && count != 0);
  }
  
  /* All attempts were failed */
  s = -1;
  if (count == 0)
    errno = ETIMEDOUT;
  
done:
  /* Close all watched fds except the succeeded one */
  for (j = 0; j < i; j++)
    if (fds[j].fd != -1)
      close(fds[j].fd);
  free(fds);
  return (s);
}

static void
whois(const char *query, const char *hostname, int flags)
{
  FILE *fp;
  struct addrinfo *hostres;
  char *buf, *host, *nhost, *p;
  int s, f;
  size_t len, i;
  
  hostres = gethostinfo(hostname, 1);
  s = connect_to_any_host(hostres);
  if (s == -1) {
//    err(EX_OSERR, "connect()");
    fprintf(thread_stderr, "connect()");
    ios_exit(EX_OSERR);
  }
  
  
  /* Restore default blocking behavior.  */
  if ((f = fcntl(s, F_GETFL)) == -1) {
    // err(EX_OSERR, "fcntl()");
    fprintf(thread_stderr, "fcntl()");
    ios_exit(EX_OSERR);
  }
  f &= ~O_NONBLOCK;
  if (fcntl(s, F_SETFL, f) == -1) {
    // err(EX_OSERR, "fcntl()");
    fprintf(thread_stderr, "fcntl()");
    ios_exit(EX_OSERR);
  }
  
  fp = fdopen(s, "r+");
  if (fp == NULL) {
    // err(EX_OSERR, "fdopen()");
    fprintf(thread_stderr, "fdopen()");
    ios_exit(EX_OSERR);
  }
  
  if (!(flags & WHOIS_SPAM_ME) &&
      (strcasecmp(hostname, DENICHOST) == 0 ||
       strcasecmp(hostname, "de" QNICHOST_TAIL) == 0)) {
        const char *q;
        int idn = 0;
        for (q = query; *q != '\0'; q++)
          if (!isascii(*q))
            idn = 1;
        fprintf(fp, "-T dn%s %s\r\n", idn ? "" : ",ace", query);
      } else if (!(flags & WHOIS_SPAM_ME) &&
                 (strcasecmp(hostname, DKNICHOST) == 0 ||
                  strcasecmp(hostname, "dk" QNICHOST_TAIL) == 0))
        fprintf(fp, "--show-handles %s\r\n", query);
      else if ((flags & WHOIS_SPAM_ME) ||
               strchr(query, ' ') != NULL)
        fprintf(fp, "%s\r\n", query);
      else if (strcasecmp(hostname, ANICHOST) == 0) {
        if (strncasecmp(query, "AS", 2) == 0 &&
            strspn(query+2, "0123456789") == strlen(query+2))
          fprintf(fp, "+ a %s\r\n", query+2);
        else
          fprintf(fp, "+ %s\r\n", query);
      } else if (strcasecmp(hostres->ai_canonname, VNICHOST) == 0)
        fprintf(fp, "domain %s\r\n", query);
      else
        fprintf(fp, "%s\r\n", query);
  fflush(fp);
  
  nhost = NULL;
  while ((buf = fgetln(fp, &len)) != NULL) {
    /* Nominet */
    if (!(flags & WHOIS_SPAM_ME) &&
        len == 5 && strncmp(buf, "-- \r\n", 5) == 0)
      break;
    
    printf("%.*s", (int)len, buf);
    
    if ((flags & WHOIS_RECURSE) && nhost == NULL) {
      for (i = 0; whois_referral[i].prefix != NULL; i++) {
        p = buf;
        SCAN(p, buf+len, *p == ' ');
        if (strncasecmp(p, whois_referral[i].prefix,
                        whois_referral[i].len) != 0)
          continue;
        p += whois_referral[i].len;
        SCAN(p, buf+len, *p == ' ');
        host = p;
        SCAN(p, buf+len, ishost(*p));
        /* avoid loops */
        if (strncmp(hostname, host, p - host) != 0)
          s_asprintf(&nhost, "%.*s",
                     (int)(p - host), host);
        break;
      }
      for (i = 0; actually_arin[i] != NULL; i++) {
        if (strncmp(buf, actually_arin[i], len) == 0) {
          s_asprintf(&nhost, "%s", ANICHOST);
          break;
        }
      }
    }
    /* Verisign etc. */
    if (!(flags & WHOIS_SPAM_ME) &&
        len >= sizeof(CHOPSPAM)-1 &&
        (strncasecmp(buf, CHOPSPAM, sizeof(CHOPSPAM)-1) == 0 ||
         strncasecmp(buf, CHOPSPAM+4, sizeof(CHOPSPAM)-5) == 0)) {
          printf("\n");
          break;
        }
  }
  fclose(fp);
  freeaddrinfo(hostres);
  if (nhost != NULL) {
    whois(query, nhost, flags);
    free(nhost);
  }
}

static void
usage(void)
{
  fprintf(thread_stderr,
          "usage: whois [-aAbfgiIklmPQrRS] [-c country-code | -h hostname] "
          "[-p port] name ...\n");
  ios_exit(EX_USAGE);
}