Table-driven usage message for adnshost.

[adns] / client / adnshost.c

/*
 * adnshost.c
 * - useful general-purpose resolver client program
 */
/*
 *  This file is
 *    Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
 *
 *  It is part of adns, which is
 *    Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
 *    Copyright (C) 1999 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 <stdio.h>
#include <string.h>
#include <errno.h>

#include "config.h"
#include "adns.h"

static void sysfail(const char *what, int errnoval) NONRETURNING;
static void sysfail(const char *what, int errnoval) {
  fprintf(stderr,"adnshost failed: %s: %s\n",what,strerror(errnoval));
  exit(10);
}

struct optinfo;
typedef void optfunc(const struct optinfo *oi, const char *arg);

struct optinfo {
  enum oi_type {
    ot_end, ot_desconly,
    ot_flag, ot_value, ot_func, ot_funcarg
  } type;
  const char *desc;
  const char *sopt, *lopt;
  int *storep, value;
  optfunc *func;
  const char *argdesc;
};

static int ov_env=1, ov_pipe=0, ov_asynch=0;
static int ov_verbose= 0;
static int ov_search=0, ov_qc_query=0, ov_qc_anshost=0, ov_qc_cname=1;
static int ov_tcp=0, ov_show_owner=1, ov_show_type=1, ov_show_cname=1;
static int ov_cname=0;
enum ttlmode { tm_none, tm_rel, tm_abs };
static int ov_ttl= tm_none;

static optfunc of_help, of_type, of_asynch_id, of_cancel_id;

static const struct optinfo global_options[]= {
  { ot_desconly, "global binary options:" },
  { ot_flag,             "Do not look at environment variables at all",
    "e", "env",            &ov_env, 0 },
  { ot_flag,             "Read queries on stdin instead of using args",
    "f", "pipe",           &ov_pipe, 1 },
  { ot_flag,             "Allow answers to be reordered",
    "a", "asynch",         &ov_asynch, 1 },
                         
  { ot_desconly, "global verbosity level:" },
  { ot_value,            "Do not print anything to stderr",
    "Vq", "quiet",         &ov_verbose, adns_if_noerrprint },
  { ot_value,            "Report unexpected kinds of problem only  (default)",
    "Vn", "no-quiet",      &ov_verbose, 0 },
  { ot_value,            "Debugging mode",
    "Vd", "debug",         &ov_verbose, adns_if_debug },
                         
  { ot_desconly, "other global options:" },
  { ot_func,             "Print usage information",
    0, "help",             0,0, of_help },

  { ot_end }
};

static const struct optinfo perquery_options[]= {
  { ot_desconly, "per-query options:" },
  { ot_funcarg,          "Query type (see below)",
    "t", "type",           0,0, &of_type, "type" },

  { ot_desconly, "per-query binary options:" },
  { ot_flag,             "Use the search list",
    "s", "search",         &ov_search, 1 },
  { ot_flag,             "Let query domains contain quote-requiring chars",
    "Qq", "qc-query",      &ov_qc_query, 1 },
  { ot_flag,             "Let hostnames in answers contain ...",
    "Qa", "qc-anshost",    &ov_qc_anshost, 1 },
  { ot_flag,             "Prevent CNAME target domains from containing ...",
    "Qc", "qc-cname",      &ov_qc_cname, 0 },
  { ot_flag,             "Force use of a virtual circuit",
    "u", "tcp",            &ov_tcp, 1 },
  { ot_flag,             "Do not display owner name in output",
    "Do", "show-owner",   &ov_show_owner, 0 },
  { ot_flag,             "Do not display RR type in output",
    "Dt", "show-type",    &ov_show_type, 0 },
  { ot_flag,             "Do not display CNAME target in output",
    "Dc", "show-cname",    &ov_show_cname, 0 },
  
  { ot_desconly, "per-query TTL mode (NB TTL is minimum across all info in reply):" },
  { ot_value,            "Show the TTL as a TTL",
    "Tt", "ttl-ttl",       &ov_ttl, tm_rel },
  { ot_value,            "Show the TTL as a time_t when the data might expire",
    "Ta", "ttl-abs",       &ov_ttl, tm_abs },
  { ot_value,            "Do not show the TTL (default)",
    "Tn", "no-ttl",        &ov_ttl, tm_none },
  
  { ot_desconly, "per-query CNAME handling mode:" },
  { ot_value,            "Call it an error if a CNAME is found",
    "Cf", "cname-reject",  &ov_cname, adns_qf_cname_forbid },
  { ot_value,            "Allow references to CNAMEs in other RRs",
    "Cl", "cname-loose",   &ov_cname, adns_qf_cname_loose },
  { ot_value,            "CNAME ok for query domain, but not in RRs (default)",
    "Cs", "cname-ok",      &ov_cname, 0 },
  
  { ot_end }
};

static const struct optinfo asynch_options[]= {
  { ot_desconly, "asynchronous mode `options':" },
  { ot_funcarg,          "Set <id>, default is decimal sequence starting 0",
    "i", "asynch-id",      0,0, &of_asynch_id, "id" },
  { ot_funcarg,          "Cancel the query with id <id>",
    0, "cancel-id",        0,0, &of_cancel_id, "id" },

  { ot_end }
};

static void printusage(void) {
  static const struct optinfo *const alloptions[]= {
    global_options, perquery_options, asynch_options, 0
  };

  const struct optinfo *const *oiap, *oip=0;
  int maxsopt, maxlopt, l;

  maxsopt= maxlopt= 0;
  
  for (oiap=alloptions; *oiap; oiap++) {
    for (oip=*oiap; oip->type != ot_end; oip++) {
      if (oip->type == ot_funcarg) continue;
      if (oip->sopt) { l= strlen(oip->sopt); if (l>maxsopt) maxsopt= l; }
      if (oip->lopt) {
        l= strlen(oip->lopt);
        if (oip->type == ot_flag && !oip->value) l+= 3;
        if (l>maxlopt) maxlopt= l;
      }
    }
  }
        
  fputs("usage: adnshost [global-opts] [query-opts] query-domain\n"
        "                             [[query-opts] query-domain ...]\n"
        "       adnshost [global-opts] [query-opts] -f|--pipe\n",
        stdout);

  for (oiap=alloptions; *oiap; oiap++) {
    putchar('\n');
    for (oip=*oiap; oip->type != ot_end; oip++) {
      switch (oip->type) {
      case ot_flag:
        if (!oip->value) {
          if (oip->sopt) {
            printf(" +%-*s --no-%-*s %s\n",
                   maxsopt, oip->sopt,
                   maxlopt-2, oip->lopt,
                   oip->desc);
          } else {
            printf(" --no-%-*s %s\n",
                   maxlopt+maxsopt+1, oip->lopt,
                   oip->desc);
          }
          break;
        }
      case ot_value: case ot_func: /* fall through */
        if (oip->sopt) {
          printf(" -%-*s --%-*s %s\n",
                 maxsopt, oip->sopt,
                 maxlopt+1, oip->lopt,
                 oip->desc);
        } else {
          printf(" --%-*s %s\n",
                 maxlopt+maxsopt+3, oip->lopt,
                 oip->desc);
        }
        break;
      case ot_funcarg:
        if (oip->sopt) {
          l= (maxlopt + maxsopt - 9 -
              (strlen(oip->sopt) + strlen(oip->lopt) + 2*strlen(oip->argdesc)));
          printf(" -%s<%s> / --%s <%s>%*s%s\n",
                 oip->sopt, oip->argdesc, oip->lopt, oip->argdesc,
                 l>2 ? l : 2, "",
                 oip->desc);
        } else {
          l= (maxlopt + maxsopt + 1 -
              (strlen(oip->lopt) + strlen(oip->argdesc)));
          printf(" --%s <%s>%*s%s\n",
                 oip->lopt, oip->argdesc,
                 l>2 ? l : 2, "",
                 oip->desc);
        }
        break;
      case ot_desconly:
        printf("%s\n", oip->desc);
        break;
      default:
        abort();
      }
    }
  }

  printf("\nEscaping domains which might start with `-':\n"
         " - %-*s Next argument is a domain, but more options may follow\n",
         maxlopt+maxsopt+3, "<domain>");
  
  fputs("\n"
        "Query domains should always be quoted according to master file format.\n"
        "\n"
        "For binary options, --FOO and --no-FOO are opposites, as are\n"
        "-X and +X.  In each case the default is the one not listed.\n"
        "Per query options stay set a particular way until they are reset,\n"
        "whether they appear on the command line or on stdin.\n"
        "All global options must preceed the first query domain.\n"
        "\n"
        "With -f, the input should be lines with either an option, possibly\n"
        "with a value argument (separated from the option by a space if it's a long\n"
        "option), or a domain (possibly preceded by a hyphen and a space to\n"
        "distinguish it from an option).\n"
        "\n"
        "Output format is master file format without class or TTL by default:\n"
        "   [<owner>] [<ttl>] [<type>] <data>\n"
        "or if the <owner> domain refers to a CNAME and --show-cname is on\n"
        "   [<owner>] [<ttl>] CNAME <cname>\n"
        "   [<cname>] [<ttl>] <type> <data>\n"
        "When a query fails you get a line like:\n"
 "   ; failed <statustype> [<owner>] [<ttl>] [<type>] <status> \"<status string>\"\n"
        "\n"
        "If you use --asynch each answer (success or failure) is preceded by a line\n"
        "   <id> <statustype> <status> <nrrs> [<cname>] \"<status string>\"\n"
        "where <nrrs> is the number of RRs that follow and <cname> will be `$' or\n"
        "the CNAME target; the CNAME indirection and error formats above are not used.\n"
        "\n"
        "Exit status:\n"
        " 0    all went well\n"
        " 1-6  at least one query failed with statustype:\n"
        "   1    localfail   )\n"
        "   2    remotefail  ) temporary errors\n"
        "   3    tempfail  __)_________________\n"
        "   4    misconfig   )\n"
        "   5    misquery    ) permanent errors\n"
        "   6    permfail    )\n"
        " 10   system trouble\n"
        " 11   usage problems\n"
        "\n"
        "Query types (see adns.h; default is addr):\n"
        "  ns  soa  ptr  mx  rp  addr       - enhanced versions\n"
        "  cname  hinfo  txt                - types with only one version\n"
        "  a  ns-  soa-  ptr-  mx-  rp-     - _raw versions\n",
        stdout);
  if (ferror(stdout)) sysfail("write usage message",errno);
}

static void of_help(const struct optinfo *oi, const char *arg) {
  printusage();
  if (fclose(stdout)) sysfail("finish writing output",errno);
  exit(0);
}

static void of_type(const struct optinfo *oi, const char *arg) { abort(); }
static void of_asynch_id(const struct optinfo *oi, const char *arg) { abort(); }
static void of_cancel_id(const struct optinfo *oi, const char *arg) { abort(); }

int main(int argc, const char *const *argv) {
  of_help(0,0);
  abort();
}