/*
* testcode/signit.c - debug tool to sign rrsets with given keys.
*
* Copyright (c) 2007, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of the NLNET LABS 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 COPYRIGHT HOLDERS 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 COPYRIGHT
* HOLDER 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.
*/

/**
* \file
*
* This program signs rrsets with the given keys. It can be used to
* construct input to test the validator with.
*/
#include "config.h"
#include <ldns/ldns.h>
#include <assert.h>

#define DNSKEY_BIT_ZSK 0x0100

/**
* Key settings
*/
struct keysets {
       /** signature inception */
       uint32_t incep;
       /** signature expiration */
       uint32_t expi;
       /** owner name */
       char* owner;
       /** keytag */
       uint16_t keytag;
       /** DNSKEY flags */
       uint16_t flags;
};

/** print usage and exit */
static void
usage(void)
{
       printf("usage:  signit expi ince keytag owner keyfile\n");
       printf("present rrset data on stdin.\n");
       printf("signed data is printed to stdout.\n");
       printf("\n");
       printf("Or use: signit NSEC3PARAM hash flags iter salt\n");
       printf("present names on stdin, hashed names are printed to stdout.\n");
       exit(1);
}

static time_t
convert_timeval(const char* str)
{
       time_t t;
       struct tm tm;
       memset(&tm, 0, sizeof(tm));
       if(strlen(str) < 14)
               return 0;
       if(sscanf(str, "%4d%2d%2d%2d%2d%2d", &tm.tm_year, &tm.tm_mon,
               &tm.tm_mday, &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6)
               return 0;
       tm.tm_year -= 1900;
       tm.tm_mon--;
       /* Check values */
       if (tm.tm_year < 70)    return 0;
       if (tm.tm_mon < 0 || tm.tm_mon > 11)    return 0;
       if (tm.tm_mday < 1 || tm.tm_mday > 31)  return 0;
       if (tm.tm_hour < 0 || tm.tm_hour > 23)  return 0;
       if (tm.tm_min < 0 || tm.tm_min > 59)    return 0;
       if (tm.tm_sec < 0 || tm.tm_sec > 59)    return 0;
       /* call ldns conversion function */
       t = ldns_mktime_from_utc(&tm);
       return t;
}

static void fatal_exit(const char* format, ...)
{
       va_list args;
       va_start(args, format);
       printf("fatal exit: ");
       vprintf(format, args);
       va_end(args);
       exit(1);
}

/** read expi ince keytag owner from cmdline */
static void
parse_cmdline(char *argv[], struct keysets* s)
{
       s->expi = convert_timeval(argv[1]);
       s->incep = convert_timeval(argv[2]);
       s->keytag = (uint16_t)atoi(argv[3]);
       s->owner = argv[4];
       s->flags = DNSKEY_BIT_ZSK; /* to enforce signing */
}

/** read all key files, exit on error */
static ldns_key_list*
read_keys(int num, char* names[], struct keysets* set)
{
       int i;
       ldns_key_list* keys = ldns_key_list_new();
       ldns_key* k;
       ldns_rdf* rdf;
       ldns_status s;
       int b;
       FILE* in;

       if(!keys) fatal_exit("alloc failure");
       for(i=0; i<num; i++) {
               printf("read keyfile %s\n", names[i]);
               in = fopen(names[i], "r");
               if(!in) fatal_exit("could not open %s: %s", names[i],
                               strerror(errno));
               s = ldns_key_new_frm_fp(&k, in);
               fclose(in);
               if(s != LDNS_STATUS_OK)
                       fatal_exit("bad keyfile %s: %s", names[i],
                               ldns_get_errorstr_by_id(s));
               ldns_key_set_expiration(k, set->expi);
               ldns_key_set_inception(k, set->incep);
               s = ldns_str2rdf_dname(&rdf, set->owner);
               if(s != LDNS_STATUS_OK)
                       fatal_exit("bad owner name %s: %s", set->owner,
                               ldns_get_errorstr_by_id(s));
               ldns_key_set_pubkey_owner(k, rdf);
               ldns_key_set_flags(k, set->flags);
               ldns_key_set_keytag(k, set->keytag);
               b = ldns_key_list_push_key(keys, k);
               assert(b);
       }
       return keys;
}

/** read list of rrs from the file */
static ldns_rr_list*
read_rrs(FILE* in)
{
       uint32_t my_ttl = 3600;
       ldns_rdf *my_origin = NULL;
       ldns_rdf *my_prev = NULL;
       ldns_status s;
       int line_nr = 1;
       int b;

       ldns_rr_list* list;
       ldns_rr *rr;

       list = ldns_rr_list_new();
       if(!list) fatal_exit("alloc error");

       while(!feof(in)) {
               s = ldns_rr_new_frm_fp_l(&rr, in, &my_ttl, &my_origin,
                       &my_prev, &line_nr);
               if(s == LDNS_STATUS_SYNTAX_TTL ||
                       s == LDNS_STATUS_SYNTAX_ORIGIN ||
                       s == LDNS_STATUS_SYNTAX_EMPTY)
                       continue;
               else if(s != LDNS_STATUS_OK)
                       fatal_exit("parse error in line %d: %s", line_nr,
                               ldns_get_errorstr_by_id(s));
               b = ldns_rr_list_push_rr(list, rr);
               assert(b);
       }
       printf("read %d lines\n", line_nr);

       return list;
}

/** sign the rrs with the keys */
static void
signit(ldns_rr_list* rrs, ldns_key_list* keys)
{
       ldns_rr_list* rrset;
       ldns_rr_list* sigs;

       while(ldns_rr_list_rr_count(rrs) > 0) {
               rrset = ldns_rr_list_pop_rrset(rrs);
               if(!rrset) fatal_exit("copy alloc failure");
               sigs = ldns_sign_public(rrset, keys);
               if(!sigs) fatal_exit("failed to sign");
               ldns_rr_list_print(stdout, rrset);
               ldns_rr_list_print(stdout, sigs);
               printf("\n");
               ldns_rr_list_free(rrset);
               ldns_rr_list_free(sigs);
       }
}

/** process keys and signit */
static void
process_keys(int argc, char* argv[])
{
       ldns_rr_list* rrs;
       ldns_key_list* keys;
       struct keysets settings;
       assert(argc == 6);

       parse_cmdline(argv, &settings);
       keys = read_keys(1, argv+5, &settings);
       rrs = read_rrs(stdin);
       signit(rrs, keys);

       ldns_rr_list_deep_free(rrs);
       ldns_key_list_free(keys);
}

/** process nsec3 params and perform hashing */
static void
process_nsec3(int argc, char* argv[])
{
       char line[10240];
       ldns_rdf* salt;
       ldns_rdf* in, *out;
       ldns_status status;
       status = ldns_str2rdf_nsec3_salt(&salt, argv[5]);
       if(status != LDNS_STATUS_OK)
               fatal_exit("Could not parse salt %s: %s", argv[5],
                       ldns_get_errorstr_by_id(status));
       assert(argc == 6);
       while(fgets(line, (int)sizeof(line), stdin)) {
               if(strlen(line) > 0)
                       line[strlen(line)-1] = 0; /* remove trailing newline */
               if(line[0]==0)
                       continue;
               status = ldns_str2rdf_dname(&in, line);
               if(status != LDNS_STATUS_OK)
                       fatal_exit("Could not parse name %s: %s", line,
                               ldns_get_errorstr_by_id(status));
               ldns_rdf_print(stdout, in);
               printf(" -> ");
               /* arg 3 is flags, unused */
               out = ldns_nsec3_hash_name(in, (uint8_t)atoi(argv[2]),
                       (uint16_t)atoi(argv[4]),
                       ldns_rdf_data(salt)[0], ldns_rdf_data(salt)+1);
               if(!out)
                       fatal_exit("Could not hash %s", line);
               ldns_rdf_print(stdout, out);
               printf("\n");
               ldns_rdf_deep_free(in);
               ldns_rdf_deep_free(out);
       }
       ldns_rdf_deep_free(salt);
}

/** main program */
int main(int argc, char* argv[])
{
       if(argc != 6) {
               usage();
       }
       if(strcmp(argv[1], "NSEC3PARAM") == 0) {
               process_nsec3(argc, argv);
               return 0;
       }
       process_keys(argc, argv);
       return 0;
}

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