text: /*
   * adh-query.c
   * - useful general-purpose resolver client program
   *   make queries and print answers
   */
  /*
   *  This file is
   *    Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
   *
   *  It is part of adns, which is
   *    Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
   *    Copyright (C) 1999-2000 Tony Finch <dot@dotat.at>
   *  
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2, or (at your option)
   *  any later version.
   *  
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *  
   *  You should have received a copy of the GNU General Public License
   *  along with this program; if not, write to the Free Software Foundation,
   *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 
   */
  
  #include "adnshost.h"
  
  adns_state ads;
  struct outstanding_list outstanding;
  
  static unsigned long idcounter;
  
  void ensure_adns_init(void) {
    adns_initflags initflags;
    int r;
    
    if (ads) return;
  
    if (signal(SIGPIPE,SIG_IGN) == SIG_ERR) sysfail("ignore SIGPIPE",errno);
  
    initflags= adns_if_noautosys|adns_if_nosigpipe|ov_verbose;
    if (!ov_env) initflags |= adns_if_noenv;
  
    if (config_text) {
      r= adns_init_strcfg(&ads, initflags, stderr, config_text);
    } else {
      r= adns_init(&ads, initflags, 0);
    }
    if (r) sysfail("adns_init",r);
  
    if (ov_format == fmt_default)
      ov_format= ov_asynch ? fmt_asynch : fmt_simple;
  }
  
  static void prep_query(struct query_node **qun_r, int *quflags_r) {
    struct query_node *qun;
    char idbuf[20];
    
    if (ov_pipe && !ads) usageerr("-f/--pipe not consistent with domains on command line");
    ensure_adns_init();
    
    qun= malloc(sizeof(*qun));
    qun->pqfr= ov_pqfr;
    if (ov_id) {
      qun->id= xstrsave(ov_id);
    } else {
      sprintf(idbuf,"%lu",idcounter++);
      idcounter &= 0x0fffffffflu;
      qun->id= xstrsave(idbuf);
    }
  
    *quflags_r=
      (ov_search ? adns_qf_search : 0) |
      (ov_tcp ? adns_qf_usevc : 0) |
      ((ov_pqfr.show_owner || ov_format == fmt_simple) ? adns_qf_owner : 0) |
      (ov_qc_query ? adns_qf_quoteok_query : 0) |
      (ov_qc_anshost ? adns_qf_quoteok_anshost : 0) |
      (ov_qc_cname ? 0 : adns_qf_quoteok_cname) |
      ov_cname,
      
    *qun_r= qun;
  }
    
  void of_ptr(const struct optioninfo *oi, const char *arg, const char *arg2) {
    struct query_node *qun;
    int quflags, r;
    struct sockaddr_in sa;
  
    memset(&sa,0,sizeof(sa));
    sa.sin_family= AF_INET;
    if (!inet_aton(arg,&sa.sin_addr)) usageerr("invalid IP address %s",arg);
  
    prep_query(&qun,&quflags);
    qun->owner= xstrsave(arg);
    r= adns_submit_reverse(ads,
  			 (struct sockaddr*)&sa,
  			 ov_type == adns_r_none ? adns_r_ptr : ov_type,
  			 quflags,
  			 qun,
  			 &qun->qu);
    if (r) sysfail("adns_submit_reverse",r);
  
    LIST_LINK_TAIL(outstanding,qun);
  }
  
  void of_reverse(const struct optioninfo *oi, const char *arg, const char *arg2) {
    struct query_node *qun;
    int quflags, r;
    struct sockaddr_in sa;
  
    memset(&sa,0,sizeof(sa));
    sa.sin_family= AF_INET;
    if (!inet_aton(arg,&sa.sin_addr)) usageerr("invalid IP address %s",arg);
  
    prep_query(&qun,&quflags);
    qun->owner= xmalloc(strlen(arg) + strlen(arg2) + 2);
    sprintf(qun->owner, "%s %s", arg,arg2);
    r= adns_submit_reverse_any(ads,
  			     (struct sockaddr*)&sa, arg2,
  			     ov_type == adns_r_none ? adns_r_txt : ov_type,
  			     quflags,
  			     qun,
  			     &qun->qu);
    if (r) sysfail("adns_submit_reverse",r);
  
    LIST_LINK_TAIL(outstanding,qun);
  }
  
  void query_do(const char *domain) {
    struct query_node *qun;
    int quflags, r;
  
    prep_query(&qun,&quflags);
    qun->owner= xstrsave(domain);
    r= adns_submit(ads, domain,
  		 ov_type == adns_r_none ? adns_r_addr : ov_type,
  		 quflags,
  		 qun,
  		 &qun->qu);
    if (r) sysfail("adns_submit",r);
  
    LIST_LINK_TAIL(outstanding,qun);
  }
  
  static void dequeue_query(struct query_node *qun) {
    LIST_UNLINK(outstanding,qun);
    free(qun->id);
    free(qun->owner);
    free(qun);
  }
  
  static void print_withspace(const char *str) {
    if (printf("%s ", str) == EOF) outerr();
  }
  
  static void print_ttl(struct query_node *qun, adns_answer *answer) {
    unsigned long ttl;
    time_t now;
    
    switch (qun->pqfr.ttl) {
    case tm_none:
      return;
    case tm_rel:
      if (time(&now) == (time_t)-1) sysfail("get current time",errno);
      ttl= answer->expires < now ? 0 : answer->expires - now;
      break;
    case tm_abs:
      ttl= answer->expires;
      break;
    default:
      abort();
    }
    if (printf("%lu ",ttl) == EOF) outerr();
  }
  
  static const char *owner_show(struct query_node *qun, adns_answer *answer) {
    return answer->owner ? answer->owner : qun->owner;
  }
  
  static void print_owner_ttl(struct query_node *qun, adns_answer *answer) {
    if (qun->pqfr.show_owner) print_withspace(owner_show(qun,answer));
    print_ttl(qun,answer);
  }
  
  static void check_status(adns_status st) {
    static const adns_status statuspoints[]= {
      adns_s_ok,
      adns_s_max_localfail, adns_s_max_remotefail, adns_s_max_tempfail,
      adns_s_max_misconfig, adns_s_max_misquery
    };
  
    const adns_status *spp;
    int minrcode;
  
    for (minrcode=0, spp=statuspoints;
         spp < statuspoints + (sizeof(statuspoints)/sizeof(statuspoints[0]));
         spp++)
      if (st > *spp) minrcode++;
    if (rcode < minrcode) rcode= minrcode;
  }
  
  static void print_status(adns_status st, struct query_node *qun, adns_answer *answer) {
    const char *statustypeabbrev, *statusabbrev, *statusstring;
  
    statustypeabbrev= adns_errtypeabbrev(st);
    statusabbrev= adns_errabbrev(st);
    statusstring= adns_strerror(st);
    assert(!strchr(statusstring,'"'));
  
    if (printf("%s %d %s ", statustypeabbrev, st, statusabbrev)
        == EOF) outerr();
    print_owner_ttl(qun,answer);
    if (qun->pqfr.show_cname)
      print_withspace(answer->cname ? answer->cname : "$");
    if (printf("\"%s\"\n", statusstring) == EOF) outerr();
  }
  
  static void print_dnsfail(adns_status st, struct query_node *qun, adns_answer *answer) {
    int r;
    const char *typename, *statusstring;
    adns_status ist;
    
    if (ov_format == fmt_inline) {
      if (fputs("; failed ",stdout) == EOF) outerr();
      print_status(st,qun,answer);
      return;
    }
    assert(ov_format == fmt_simple);
    if (st == adns_s_nxdomain) {
      r= fprintf(stderr,"%s does not exist\n", owner_show(qun,answer));
    } else {
      ist= adns_rr_info(answer->type, &typename, 0,0,0,0);
      if (st == adns_s_nodata) {
        r= fprintf(stderr,"%s has no %s record\n", owner_show(qun,answer), typename);
      } else {
        statusstring= adns_strerror(st);
        r= fprintf(stderr,"Error during DNS %s lookup for %s: %s\n",
  		 typename, owner_show(qun,answer), statusstring);
      }
    }
    if (r == EOF) sysfail("write error message to stderr",errno);
  }
      
  void query_done(struct query_node *qun, adns_answer *answer) {
    adns_status st, ist;
    int rrn, nrrs;
    const char *rrp, *realowner, *typename;
    char *datastr;
  
    st= answer->status;
    nrrs= answer->nrrs;
    if (ov_format == fmt_asynch) {
      check_status(st);
      if (printf("%s %d ", qun->id, nrrs) == EOF) outerr();
      print_status(st,qun,answer);
    } else {
      if (qun->pqfr.show_cname && answer->cname) {
        print_owner_ttl(qun,answer);
        if (qun->pqfr.show_type) print_withspace("CNAME");
        if (printf("%s\n", answer->cname) == EOF) outerr();
      }
      if (st) {
        check_status(st);
        print_dnsfail(st,qun,answer);
      }
    }
    if (qun->pqfr.show_owner) {
      realowner= answer->cname ? answer->cname : owner_show(qun,answer);
      assert(realowner);
    } else {
      realowner= 0;
    }
    if (nrrs) {
      for (rrn=0, rrp = answer->rrs.untyped;
  	 rrn < nrrs;
  	 rrn++, rrp += answer->rrsz) {
        if (realowner) print_withspace(realowner);
        print_ttl(qun,answer);
        ist= adns_rr_info(answer->type, &typename, 0, 0, rrp, &datastr);
        if (ist == adns_s_nomemory) sysfail("adns_rr_info failed",ENOMEM);
        assert(!ist);
        if (qun->pqfr.show_type) print_withspace(typename);
        if (printf("%s\n",datastr) == EOF) outerr();
        free(datastr);
      }
    }
    if (fflush(stdout)) outerr();
    free(answer);
    dequeue_query(qun);
  }
  
  void of_asynch_id(const struct optioninfo *oi, const char *arg, const char *arg2) {
    free(ov_id);
    ov_id= xstrsave(arg);
  }
  
  void of_cancel_id(const struct optioninfo *oi, const char *arg, const char *arg2) {
    struct query_node *qun;
  
    for (qun= outstanding.head;
         qun && strcmp(qun->id,arg);
         qun= qun->next);
    if (!qun) return;
    adns_cancel(qun->qu);
    dequeue_query(qun);
  }
  