#include <config.h>

#include <netdb.h>

#include <stdlib.h>

#include <unistd.h>

#include <dns/callbacks.h>

#include <dns/dispatch.h>

#include <dns/events.h>

#include <dns/message.h>

#include <dns/name.h>

#include <dns/rdata.h>

#include <dns/rdatalist.h>

#include <dns/rdataset.h>

#include <dns/rdatastruct.h>

#include <dns/rdatatype.h>

#include <dns/request.h>

#include <dns/result.h>

#include <dns/tsig.h>

#include <dst/dst.h>

#include <isc/app.h>

#include <isc/base64.h>

#include <isc/buffer.h>

#include <isc/condition.h>

#include <isc/entropy.h>

#include <isc/lex.h>

#include <isc/mem.h>

#include <isc/mutex.h>

#include <isc/region.h>

#include <isc/sockaddr.h>

#include <isc/socket.h>

#include <isc/stdtime.h>

#include <isc/string.h>

#include <isc/task.h>

#include <isc/timer.h>

#include <isc/types.h>

#include <isc/util.h>

#define MXNAME 256

#define MAXCMD 256

#define NAMEBUF 512

#define NAMEHINT 64

#define PACKETSIZE 2048

#define MSGTEXT 4069

#define FIND_TIMEOUT 5

#define VALID_NAME(n) ISC_MAGIC_VALID(n, DNS_NAME_MAGIC)

#define RESOLV_CONF "/etc/resolv.conf"

extern isc_boolean_t isc_mem_debugging;

isc_boolean_t busy= ISC_FALSE, debugging = ISC_FALSE, ddebugging = ISC_FALSE,

have_ipv6 = ISC_FALSE, valid_zonename = ISC_FALSE,

forced_master = ISC_FALSE, is_dst_up = ISC_FALSE;

isc_mutex_t lock;

isc_condition_t cond;

isc_taskmgr_t *taskmgr = NULL;

isc_task_t *global_task = NULL;

isc_mem_t *mctx = NULL;

dns_dispatchmgr_t *dispatchmgr = NULL;

dns_requestmgr_t *requestmgr = NULL;

isc_socketmgr_t *socketmgr = NULL;

isc_timermgr_t *timermgr = NULL;

dns_dispatch_t *dispatchv4 = NULL;

dns_message_t *updatemsg = NULL, *findmsg = NULL;

dns_name_t zonename; /* From ZONE command */

dns_name_t actualzone; /* From SOA query reply */

dns_name_t resolvdomain; /* From resolv.conf's domain line, if exists */

dns_name_t *current_zone; /* Points to one of above, or dns_rootname */

isc_buffer_t resolvbuf;

char resolvstore[MXNAME];

dns_name_t master; /* Master nameserver, from SOA query */

dns_tsigkey_t *key = NULL;

dns_tsig_keyring_t *keyring = NULL;

int exitcode = 0;

char server[MXNAME];

char userzone[MXNAME];

char nameservername[3][MXNAME];

int nameservers;

int ns_inuse = 0;

int ndots = 1;

char domain[MXNAME];

char keynametext[MXNAME]="";

char keysecret[MXNAME]="";

dns_name_t keyname;

isc_buffer_t *keynamebuf = NULL;

isc_entropy_t *entp = NULL;

#define STATUS_MORE 0

#define STATUS_SEND 1

#define STATUS_QUIT 2

#define STATUS_FAIL 3

#define STATUS_SYNTAX 4

static int

count_dots(char *string) {

char *s;

int i=0;

s = string;

while (*s != 0) {

if (*s == '.')

i++;

s++;

}

return (i);

}

static void

fatal(const char *format, ...) {

va_list args;

va_start(args, format);

vfprintf(stderr, format, args);

va_end(args);

fprintf(stderr, "\n");

if (exitcode == 0)

exitcode = 8;

exit(exitcode);

}

static void

debug(const char *format, ...) {

va_list args;

if (debugging) {

va_start(args, format);

vfprintf(stderr, format, args);

va_end(args);

fprintf(stderr, "\n");

}

}

static void

ddebug(const char *format, ...) {

va_list args;

if (ddebugging) {

va_start(args, format);

vfprintf(stderr, format, args);

va_end(args);

fprintf(stderr, "\n");

}

}

static void

check_result(isc_result_t result, const char *msg) {

if (result != ISC_R_SUCCESS) {

exitcode = 1;

fatal("%s: %s", msg, isc_result_totext(result));

}

}

static void

load_resolv_conf() {

FILE *fp;

char rcinput[MXNAME];

char *ptr;

ddebug ("load_resolv_conf()");

fp = fopen (RESOLV_CONF, "r");

if (fp != NULL) {

while (fgets(rcinput, MXNAME, fp) != 0) {

ptr = strtok (rcinput, " \t\r\n");

if (ptr != NULL) {

if (strcasecmp(ptr, "nameserver") == 0) {

ddebug ("Got a nameserver line");

ptr = strtok (NULL, " \t\r\n");

if (ptr != NULL) {

if (nameservers < 3) {

strncpy(nameservername

[nameservers],

ptr,MXNAME);

nameservers++;

}

}

} else if (strcasecmp(ptr, "options") == 0) {

ptr = strtok(NULL, " \t\r\n");

if (ptr != NULL) {

if (strncasecmp(ptr, "ndots:",

6) == 0) {

ndots = atoi(&ptr[6]);

ddebug ("ndots is "

"%d.",

ndots);

}

}

/* XXXMWS Searchlist not supported! */

} else if ((strcasecmp(ptr, "domain") == 0) &&

(domain[0] == 0 )){

while ((ptr = strtok(NULL, " \t\r\n"))

!= NULL) {

strncpy(domain, ptr, MXNAME);

}

}

}

}

fclose (fp);

}

}

static void

reset_system() {

isc_result_t result;

ddebug ("reset_system()");

/* If the update message is still around, destroy it */

if (updatemsg != NULL)

dns_message_destroy(&updatemsg);

if (findmsg != NULL)

dns_message_destroy(&findmsg);

result = dns_message_create(mctx, DNS_MESSAGE_INTENTRENDER,

&updatemsg);

check_result (result, "dns_message_create");

updatemsg->opcode = dns_opcode_update;

valid_zonename = ISC_FALSE;

if (VALID_NAME(&zonename))

dns_name_free(&zonename, mctx);

if (VALID_NAME(&actualzone))

dns_name_free(&actualzone, mctx);

if (VALID_NAME(&master))

dns_name_free(&master, mctx);

if (domain[0] != 0)

current_zone = &resolvdomain;

else

current_zone = dns_rootname;

}

static void

setup_system(){

isc_result_t result;

isc_sockaddr_t bind_any;

isc_buffer_t buf;

int secretsize;

unsigned char *secretstore;

isc_buffer_t secretsrc;

isc_buffer_t secretbuf;

isc_lex_t *lex = NULL;

isc_stdtime_t now;

ddebug("setup_system()");

/*

srandom (getpid() + (int)&setup_system);

isc_mem_debugging = ISC_FALSE;

load_resolv_conf();

result = isc_app_start();

check_result(result, "isc_app_start");

result = isc_net_probeipv4();

check_result(result, "isc_net_probeipv4");

/* XXXMWS There isn't any actual V6 support in the code yet */

result = isc_net_probeipv6();

if (result == ISC_R_SUCCESS)

have_ipv6=ISC_TRUE;

result = isc_mem_create(0, 0, &mctx);

check_result(result, "isc_mem_create");

result = dns_dispatchmgr_create(mctx, NULL, &dispatchmgr);

check_result(result, "dns_dispatchmgr_create");

result = isc_socketmgr_create(mctx, &socketmgr);

check_result(result, "dns_socketmgr_create");

result = isc_timermgr_create(mctx, &timermgr);

check_result(result, "dns_timermgr_create");

result = isc_taskmgr_create (mctx, 1, 0, &taskmgr);

check_result(result, "isc_taskmgr_create");

result = isc_task_create (taskmgr, 0, &global_task);

check_result(result, "isc_task_create");

result = isc_entropy_create (mctx, &entp);

check_result(result, "isc_entropy_create");

result = dst_lib_init (mctx, entp, 0);

check_result(result, "dst_lib_init");

is_dst_up = ISC_TRUE;

isc_sockaddr_any(&bind_any);

result = dns_dispatch_getudp(dispatchmgr, socketmgr, taskmgr,

&bind_any, PACKETSIZE, 4, 2, 3, 5,

DNS_DISPATCHATTR_UDP |

DNS_DISPATCHATTR_IPV4 |

DNS_DISPATCHATTR_MAKEQUERY, 0,

&dispatchv4);

check_result(result, "dns_dispatch_getudp");

result = dns_requestmgr_create(mctx, timermgr,

socketmgr, taskmgr, dispatchmgr,

dispatchv4, NULL, &requestmgr);

check_result(result, "dns_requestmgr_create");

if (domain[0] != 0) {

dns_name_init(&resolvdomain, NULL);

isc_buffer_init(&resolvbuf, resolvstore, NAMEBUF);

dns_name_setbuffer(&resolvdomain, &resolvbuf);

isc_buffer_init(&buf, domain, strlen(domain));

isc_buffer_add(&buf, strlen(domain));

result = dns_name_fromtext(&resolvdomain, &buf, dns_rootname,

ISC_FALSE, NULL);

check_result(result, "dns_name_fromtext");

current_zone = &resolvdomain;

}

else {

current_zone = dns_rootname;

}

if (keysecret[0] != 0) {

debug("Creating key...");

result = dns_tsigkeyring_create(mctx, &keyring);

check_result(result, "dns_tsigkeyringcreate");

result = isc_buffer_allocate(mctx, &keynamebuf, MXNAME);

check_result(result, "isc_buffer_allocate");

dns_name_init(&keyname, NULL);

check_result(result, "dns_name_init");

isc_buffer_putstr(keynamebuf, keynametext);

secretsize = strlen(keysecret) * 3 / 4;

secretstore = isc_mem_get(mctx, secretsize);

ENSURE (secretstore != NULL);

isc_buffer_init(&secretsrc, keysecret, strlen(keysecret));

isc_buffer_add(&secretsrc, strlen(keysecret));

isc_buffer_init(&secretbuf, secretstore, secretsize);

result = isc_lex_create(mctx, strlen(keysecret), &lex);

check_result(result, "isc_lex_create");

result = isc_lex_openbuffer(lex, &secretsrc);

check_result(result, "isc_lex_openbuffer");

result = isc_base64_tobuffer(lex, &secretbuf, -1);

if (result != ISC_R_SUCCESS) {

printf (";; Couldn't create key %s: %s\n",

keynametext, isc_result_totext(result));

isc_lex_close(lex);

isc_lex_destroy(&lex);

goto SYSSETUP_FAIL;

}

secretsize = isc_buffer_usedlength(&secretbuf);

debug("close");

isc_lex_close(lex);

isc_lex_destroy(&lex);

isc_stdtime_get(&now);

debug("namefromtext");

result = dns_name_fromtext(&keyname, keynamebuf,

dns_rootname, ISC_FALSE,

keynamebuf);

if (result != ISC_R_SUCCESS) {

printf (";; Couldn't create key %s: %s\n",

keynametext, dns_result_totext(result));

goto SYSSETUP_FAIL;

}

debug("tsigkey");

result = dns_tsigkey_create(&keyname, dns_tsig_hmacmd5_name,

secretstore, secretsize,

ISC_TRUE, NULL, now, now, mctx,

keyring, &key);

if (result != ISC_R_SUCCESS) {

printf (";; Couldn't create key %s: %s\n",

keynametext, dns_result_totext(result));

}

isc_mem_put(mctx, secretstore, secretsize);

dns_name_invalidate(&keyname);

isc_buffer_free(&keynamebuf);

return;

SYSSETUP_FAIL:

isc_mem_put(mctx, secretstore, secretsize);

dns_name_invalidate(&keyname);

isc_buffer_free(&keynamebuf);

dns_tsigkeyring_destroy(&keyring);

}

}

static void

set_key(char *key) {

char *nameptr;

char *secptr;

debug("set_key");

nameptr = strtok(key, ": \t\r\n");

if (nameptr == NULL) {

fputs ("Need a key entry\n", stderr);

return;

}

secptr = strtok(NULL, " \t\r\n");

if (secptr == NULL) {

fputs ("Need a key entry\n", stderr);

return;

}

strncpy (keynametext, nameptr, MXNAME);

strncpy (keysecret, secptr, MXNAME);

}

static void

parse_args(int argc, char **argv) {

int rc;

char **rv;

debug("parse_args");

rc = argc;

rv = argv;

for (rc--, rv++; rc > 0; rc--, rv++) {

if (strcasecmp(rv[0], "-d") == 0)

debugging = ISC_TRUE;

else if (strcasecmp(rv[0], "-dd") == 0) {

ddebugging = ISC_TRUE;

debug ("Just turned on debugging");

} else if (strcasecmp(rv[0], "-dm") == 0) {

ddebugging = ISC_TRUE;

isc_mem_debugging = ISC_TRUE;

} else if (strncasecmp(rv[0],"-y", 2) == 0) {

debug ("In -y test");

if (rv[0][2] != 0)

set_key(&rv[0][2]);

else {

rc--;

rv++;

if (rc == 0) {

fputs ("Need a key entry\n", stderr);

return;

}

set_key(rv[0]);

}

} else if (strcasecmp(rv[0], "-v") == 0)

fputs ("Virtual Circuit mode not currently "

"implemented.\n", stderr);

else if (strcasecmp(rv[0], "-k") == 0)

fputs ("TSIG not currently implemented.",

stderr);

}

}

static void

check_and_add_zone(dns_name_t *namein) {

ddebug ("check_and_add_zone()");

if (valid_zonename)

return;

dns_name_init(&zonename, NULL);

dns_name_dup(namein, mctx, &zonename);

current_zone = &zonename;

valid_zonename = ISC_TRUE;

}

static isc_uint16_t

make_rrset_prereq(dns_rdataclass_t rdclass) {

isc_result_t result;

char *nameptr, *typeptr;

dns_name_t *name = NULL;

isc_buffer_t *buf = NULL;

isc_buffer_t source;

isc_textregion_t typeregion;

dns_rdataset_t *rdataset = NULL;

dns_rdatalist_t *rdatalist = NULL;

dns_rdatatype_t rdatatype;

dns_rdata_t *rdata = NULL;

dns_name_t *rn = current_zone;

ddebug ("make_rrset_prereq()");

nameptr = strtok(NULL, " \t\r\n");

if (nameptr == NULL) {

puts ("failed to read owner name");

return STATUS_SYNTAX;

}

typeptr = strtok(NULL, " \t\r\n");

if (typeptr == NULL) {

puts ("failed to read owner type");

return STATUS_SYNTAX;

}

result = dns_message_gettempname(updatemsg, &name);

check_result(result, "dns_message_gettempname");

result = isc_buffer_allocate(mctx, &buf, NAMEBUF);

check_result(result, "isc_buffer_allocate");

dns_name_init(name, NULL);

dns_name_setbuffer(name, buf);

dns_message_takebuffer(updatemsg, &buf);

isc_buffer_init(&source, nameptr, strlen(nameptr));

isc_buffer_add(&source, strlen(nameptr));

if (count_dots(nameptr) > ndots)

rn = dns_rootname;

result = dns_name_fromtext(name, &source, rn,

ISC_FALSE, NULL);

check_result(result, "dns_name_fromtext");

check_and_add_zone(name);

typeregion.base = typeptr;

typeregion.length = strlen(typeptr);

result = dns_rdatatype_fromtext(&rdatatype, &typeregion);

check_result (result, "dns_rdatatype_fromtext");

result = dns_message_gettemprdatalist(updatemsg, &rdatalist);

check_result(result, "dns_message_gettemprdatalist");

result = dns_message_gettemprdataset(updatemsg, &rdataset);

check_result(result, "dns_message_gettemprdataset");

dns_rdatalist_init(rdatalist);

rdatalist->type = rdatatype;

rdatalist->rdclass = rdclass;

rdatalist->covers = 0;

rdatalist->ttl = 0;

result = dns_message_gettemprdata(updatemsg, &rdata);

check_result(result, "dns_message_gettemprdata");

rdata->data = NULL;

rdata->length = 0;

rdata->rdclass = rdclass;

rdata->type = rdatatype;

ISC_LIST_INIT(rdatalist->rdata);

ISC_LIST_APPEND(rdatalist->rdata, rdata, link);

dns_rdataset_init(rdataset);

dns_rdatalist_tordataset(rdatalist, rdataset);

ISC_LIST_INIT(name->list);

ISC_LIST_APPEND(name->list, rdataset, link);

dns_message_addname(updatemsg, name, DNS_SECTION_PREREQUISITE);

return STATUS_MORE;

}

static isc_uint16_t

make_domain_prereq(dns_rdataclass_t rdclass) {

isc_result_t result;

char *ptr;

dns_name_t *name = NULL;

isc_buffer_t *buf = NULL;

isc_buffer_t source;

dns_rdataset_t *rdataset = NULL;

dns_rdatalist_t *rdatalist = NULL;

dns_rdata_t *rdata = NULL;

dns_name_t *rn = current_zone;

ddebug ("make_domain_prereq()");

ptr = strtok(NULL, " \t\r\n");

if (ptr == NULL) {

puts ("failed to read owner name");

return STATUS_SYNTAX;

}

result = dns_message_gettempname(updatemsg, &name);

check_result(result, "dns_message_gettempname");

result = isc_buffer_allocate(mctx, &buf, NAMEBUF);

check_result(result, "isc_buffer_allocate");

dns_name_init(name, NULL);

dns_name_setbuffer(name, buf);

dns_message_takebuffer(updatemsg, &buf);

isc_buffer_init(&source, ptr, strlen(ptr));

isc_buffer_add(&source, strlen(ptr));

if (count_dots(ptr) > ndots)

rn = dns_rootname;

result = dns_name_fromtext(name, &source, rn,

ISC_FALSE, NULL);

check_result(result, "dns_name_fromtext");

check_and_add_zone(name);

result = dns_message_gettemprdatalist(updatemsg, &rdatalist);

check_result(result, "dns_message_gettemprdatalist");

result = dns_message_gettemprdataset(updatemsg, &rdataset);

check_result(result, "dns_message_gettemprdataset");

dns_rdatalist_init(rdatalist);

rdatalist->type = dns_rdatatype_any;

rdatalist->rdclass = rdclass;

rdatalist->covers = 0;

rdatalist->ttl = 0;

result = dns_message_gettemprdata(updatemsg, &rdata);

check_result(result, "dns_message_gettemprdata");

rdata->data = NULL;

rdata->length = 0;

rdata->rdclass = rdclass;

rdata->type = dns_rdatatype_any;

ISC_LIST_INIT(rdatalist->rdata);

ISC_LIST_APPEND(rdatalist->rdata, rdata, link);

dns_rdataset_init(rdataset);

dns_rdatalist_tordataset(rdatalist, rdataset);

ISC_LIST_INIT(name->list);

ISC_LIST_APPEND(name->list, rdataset, link);

dns_message_addname(updatemsg, name, DNS_SECTION_PREREQUISITE);

return STATUS_MORE;

}

static isc_uint16_t

evaluate_prereq() {

char *ptr;

ddebug ("evaluate_prereq()");

ptr = strtok(NULL, " \t\r\n");

if (ptr == NULL) {

puts ("failed to read operation code");

return STATUS_SYNTAX;

}

if (strcasecmp(ptr,"nxdomain") == 0)

return(make_domain_prereq(dns_rdataclass_none));

if (strcasecmp(ptr,"yxdomain") == 0)

return(make_domain_prereq(dns_rdataclass_any));

if (strcasecmp(ptr,"nxrrset") == 0)

return(make_rrset_prereq(dns_rdataclass_none));

if (strcasecmp(ptr,"yxrrset") == 0)

return(make_rrset_prereq(dns_rdataclass_any));

printf ("incorrect operation code: %s\n",ptr);

return(STATUS_SYNTAX);

}

static isc_uint16_t

evaluate_server() {

char *ptr;

ddebug ("evaluate_server()");

ptr = strtok(NULL, " \t\r\n");

if (ptr == NULL) {

puts ("failed to read server name");

return STATUS_SYNTAX;

}

strncpy(server, ptr, MXNAME);

return STATUS_MORE;

}

static isc_uint16_t

evaluate_zone() {

char *ptr;

dns_name_t name;

isc_buffer_t source, *buf = NULL;

isc_result_t result;

ddebug ("evaluate_zone()");

ptr = strtok(NULL, " \t\r\n");

if (ptr == NULL) {

puts ("failed to read zone name");

return STATUS_SYNTAX;

}

strncpy(userzone, ptr, MXNAME);

result = isc_buffer_allocate(mctx, &buf, NAMEBUF);

check_result(result, "isc_buffer_allocate");

dns_name_init(&name, NULL);

dns_name_setbuffer(&name, buf);

isc_buffer_init(&source, ptr, strlen(ptr));

isc_buffer_add(&source, strlen(ptr));

result = dns_name_fromtext(&name, &source, dns_rootname,

ISC_FALSE, NULL);

check_result(result, "dns_name_fromtext");

check_and_add_zone(&name);

isc_buffer_free(&buf);

return STATUS_MORE;

}

static isc_uint16_t

update_add() {

isc_result_t result;

isc_lex_t *lex = NULL;

isc_buffer_t *buf = NULL;

isc_buffer_t *namebuf = NULL;

isc_buffer_t source;

dns_name_t *name = NULL;

isc_uint16_t ttl;

char *ptr, *type, *data;

dns_rdatatype_t rdatatype;

dns_rdatacallbacks_t callbacks;

dns_rdata_t *rdata = NULL;

dns_rdatalist_t *rdatalist = NULL;

dns_rdataset_t *rdataset = NULL;

isc_textregion_t region;

dns_name_t *rn = current_zone;

ddebug ("update_add()");

ptr = strtok(NULL, " \t\r\n");

if (ptr == NULL) {

puts ("failed to read owner name");

return STATUS_SYNTAX;

}

result = dns_message_gettempname(updatemsg, &name);

check_result(result, "dns_message_gettempname");

result = isc_buffer_allocate(mctx, &namebuf, NAMEBUF);

check_result(result, "isc_buffer_allocate");

dns_name_init(name, NULL);

dns_name_setbuffer(name, namebuf);

dns_message_takebuffer(updatemsg, &namebuf);

isc_buffer_init(&source, ptr, strlen(ptr));

isc_buffer_add(&source, strlen(ptr));

if (count_dots(ptr) > ndots)

rn = dns_rootname;

result = dns_name_fromtext(name, &source, rn,

ISC_FALSE, NULL);

check_result(result, "dns_name_fromtext");

check_and_add_zone(name);

ptr = strtok(NULL, " \t\r\n");

if (ptr == NULL) {

puts ("failed to read owner ttl");

dns_message_puttempname(updatemsg, &name);

return STATUS_SYNTAX;

}

ttl = atoi(ptr);

type = strtok(NULL, " \t\r\n");

if (type == NULL) {

puts ("failed to read owner type");

dns_message_puttempname(updatemsg, &name);

return STATUS_SYNTAX;

}

data = strtok(NULL, " \t\r\n");

if (data == NULL) {

puts ("failed to read owner data");

dns_message_puttempname(updatemsg, &name);

return STATUS_SYNTAX;

}

result = isc_lex_create(mctx, NAMEHINT, &lex);

check_result(result, "isc_lex_create");

region.base = type;

region.length = strlen(type);

result = dns_rdatatype_fromtext(&rdatatype, &region);

check_result(result, "dns_rdatatype_fromtext");

isc_buffer_invalidate(&source);

isc_buffer_init(&source, data, strlen(data));

isc_buffer_add(&source, strlen(data));

result = isc_lex_openbuffer(lex, &source);

check_result(result, "isc_lex_openbuffer");

result = isc_buffer_allocate(mctx, &buf, MXNAME);

check_result(result, "isc_buffer_allocate");

result = dns_message_gettemprdata(updatemsg, &rdata);

check_result(result, "dns_message_gettemprdata");

dns_rdatacallbacks_init_stdio(&callbacks);

result = dns_rdata_fromtext(rdata, dns_rdataclass_in, rdatatype,

lex, current_zone, ISC_FALSE, buf,

&callbacks);

check_result(result, "dns_rdata_fromtext");

isc_lex_destroy(&lex);

check_and_add_zone(name);

result = dns_message_gettemprdatalist(updatemsg, &rdatalist);

check_result(result, "dns_message_gettemprdatalist");

result = dns_message_gettemprdataset(updatemsg, &rdataset);

check_result(result, "dns_message_gettemprdataset");

dns_rdatalist_init(rdatalist);

rdatalist->type = rdatatype;

rdatalist->rdclass = dns_rdataclass_in;

rdatalist->covers = rdatatype;

rdatalist->ttl = ttl;

ISC_LIST_INIT(rdatalist->rdata);

ISC_LIST_APPEND(rdatalist->rdata, rdata, link);

dns_rdataset_init(rdataset);

dns_rdatalist_tordataset(rdatalist, rdataset);

ISC_LIST_INIT(name->list);

ISC_LIST_APPEND(name->list, rdataset, link);

dns_message_addname(updatemsg, name, DNS_SECTION_UPDATE);

dns_message_takebuffer(updatemsg, &buf);

return STATUS_MORE;

}

static isc_uint16_t

update_delete() {

isc_result_t result;

isc_lex_t *lex = NULL;

isc_buffer_t *namebuf = NULL;

isc_buffer_t *buf = NULL;

isc_buffer_t source;

dns_name_t *name = NULL;

char *ptr, *typeptr, *dataptr = NULL;

dns_rdatatype_t rdatatype;

dns_rdatacallbacks_t callbacks;

dns_rdata_t *rdata = NULL;

dns_rdatalist_t *rdatalist = NULL;

dns_rdataset_t *rdataset = NULL;

isc_textregion_t typeregion;

dns_name_t *rn = current_zone;

ddebug ("update_delete()");

ptr = strtok(NULL, " \t\r\n");

if (ptr == NULL) {

puts ("failed to read owner name");

return STATUS_SYNTAX;

}

result = dns_message_gettempname(updatemsg, &name);

check_result(result, "dns_message_gettempname");

result = isc_buffer_allocate(mctx, &namebuf, NAMEBUF);

check_result(result, "isc_buffer_allocate");

dns_name_init(name, NULL);

dns_name_setbuffer(name, namebuf);

dns_message_takebuffer(updatemsg, &namebuf);

isc_buffer_init(&source, ptr, strlen(ptr));

isc_buffer_add(&source, strlen(ptr));

if (count_dots(ptr) > ndots)

rn = dns_rootname;

result = dns_name_fromtext(name, &source, rn,

ISC_FALSE, NULL);

check_result(result, "dns_name_fromtext");

check_and_add_zone(name);

typeptr = strtok(NULL, " \t\r\n");

if (typeptr != NULL) {

dataptr = strtok(NULL, " \t\r\n");

}

if (typeptr != NULL) {

typeregion.base = typeptr;

typeregion.length = strlen(typeptr);

result = dns_rdatatype_fromtext(&rdatatype, &typeregion);

check_result(result, "dns_rdatatype_fromtext");

isc_buffer_invalidate(&source);

}

else {

rdatatype = dns_rdatatype_any;

}

if (dataptr != NULL) {

result = isc_lex_create(mctx, NAMEHINT, &lex);

check_result(result, "isc_lex_create");

isc_buffer_init(&source, dataptr, strlen(dataptr));

isc_buffer_add(&source, strlen(dataptr));

result = isc_lex_openbuffer(lex, &source);

check_result(result, "isc_lex_openbuffer");

result = isc_buffer_allocate(mctx, &buf, MXNAME);

check_result(result, "isc_buffer_allocate");

result = dns_message_gettemprdata(updatemsg, &rdata);

check_result(result, "dns_message_gettemprdata");

dns_rdatacallbacks_init_stdio(&callbacks);

result = dns_rdata_fromtext(rdata, dns_rdataclass_in,

rdatatype, lex, current_zone,

ISC_FALSE, buf, &callbacks);

check_result(result, "dns_rdata_fromtext");

isc_lex_destroy(&lex);

result = dns_message_gettemprdatalist(updatemsg, &rdatalist);

check_result(result, "dns_message_gettemprdatalist");

result = dns_message_gettemprdataset(updatemsg, &rdataset);

check_result(result, "dns_message_gettemprdataset");

dns_rdatalist_init(rdatalist);

rdatalist->type = rdatatype;

rdatalist->rdclass = dns_rdataclass_none;

rdatalist->covers = 0;

rdatalist->ttl = 0;

ISC_LIST_INIT(rdatalist->rdata);

ISC_LIST_APPEND(rdatalist->rdata, rdata, link);

dns_rdataset_init(rdataset);

dns_rdatalist_tordataset(rdatalist, rdataset);

isc_buffer_free(&buf);

}

else {

result = dns_message_gettemprdatalist(updatemsg, &rdatalist);

check_result(result, "dns_message_gettemprdatalist");

result = dns_message_gettemprdataset(updatemsg, &rdataset);

check_result(result, "dns_message_gettemprdataset");

dns_rdatalist_init(rdatalist);

rdatalist->type = rdatatype;

rdatalist->rdclass = dns_rdataclass_any;

rdatalist->covers = 0;

rdatalist->ttl = 0;

result = dns_message_gettemprdata(updatemsg, &rdata);

check_result(result, "dns_message_gettemprdata");

rdata->data = NULL;

rdata->length = 0;

rdata->rdclass = dns_rdataclass_any;

rdata->type = rdatatype;

ISC_LIST_INIT(rdatalist->rdata);

ISC_LIST_APPEND(rdatalist->rdata, rdata, link);

dns_rdataset_init(rdataset);

dns_rdatalist_tordataset(rdatalist, rdataset);

}

ISC_LIST_INIT(name->list);

ISC_LIST_APPEND(name->list, rdataset, link);

dns_message_addname(updatemsg, name, DNS_SECTION_UPDATE);

return STATUS_MORE;

}

static isc_uint16_t

evaluate_update() {

char *ptr;

ddebug ("evaluate_update()");

ptr = strtok(NULL, " \t\r\n");

if (ptr == NULL) {

puts ("failed to read operation code");

return STATUS_SYNTAX;

}

if (strcasecmp(ptr,"delete") == 0)

return(update_delete());

if (strcasecmp(ptr,"add") == 0)

return(update_add());

printf ("incorrect operation code: %s\n",ptr);

return(STATUS_SYNTAX);

}

static void

show_message() {

isc_result_t result;

char store[MSGTEXT];

isc_buffer_t buf;

ddebug ("show_message()");

isc_buffer_init(&buf, store, MSGTEXT);

result = dns_message_totext(updatemsg, 0, &buf);

check_result(result, "dns_message_totext");

printf ("Outgoing update query:\n%.*s",

(int)isc_buffer_usedlength(&buf),

(char*)isc_buffer_base(&buf));

}

static isc_uint16_t

get_next_command() {

char cmdline[MAXCMD];

char *ptr;

ddebug ("get_next_command()");

fputs ("> ", stderr);

fgets (cmdline, MAXCMD, stdin);

ptr = strtok(cmdline, " \t\r\n");

if (feof(stdin))

return(STATUS_QUIT);

if (ptr == NULL)

return(STATUS_SEND);

if (strcasecmp(ptr,"quit") == 0)

return(STATUS_QUIT);

if (strcasecmp(ptr,"prereq") == 0)

return(evaluate_prereq());

if (strcasecmp(ptr,"update") == 0)

return(evaluate_update());

if (strcasecmp(ptr,"server") == 0)

return(evaluate_server());

if (strcasecmp(ptr,"zone") == 0)

return(evaluate_zone());

if (strcasecmp(ptr,"send") == 0)

return(STATUS_SEND);

if (strcasecmp(ptr,"show") == 0) {

show_message();

return(STATUS_MORE);

}

printf ("incorrect section name: %s\n",ptr);

return(STATUS_SYNTAX);

}

static isc_boolean_t

user_interaction() {

isc_uint16_t result = STATUS_MORE;

ddebug ("user_interaction()");

while ((result == STATUS_MORE) || (result == STATUS_SYNTAX)) {

result = get_next_command();

}

if (result == STATUS_SEND)

return ISC_TRUE;

if (result == STATUS_FAIL)

exitcode = 1;

return ISC_FALSE;

}

static void

get_address(char *host, in_port_t port, isc_sockaddr_t *sockaddr) {

struct in_addr in4;

struct in6_addr in6;

struct hostent *he;

ddebug("get_address()");

if (have_ipv6 && inet_pton(AF_INET6, host, &in6) == 1)

isc_sockaddr_fromin6(sockaddr, &in6, port);

else if (inet_pton(AF_INET, host, &in4) == 1)

isc_sockaddr_fromin(sockaddr, &in4, port);

else {

he = gethostbyname(host);

if (he == NULL)

fatal("Couldn't look up your server host %s. errno=%d",

host, h_errno);

INSIST(he->h_addrtype == AF_INET);

isc_sockaddr_fromin(sockaddr,

(struct in_addr *)(he->h_addr_list[0]),

port);

}

}

static void

update_completed(isc_task_t *task, isc_event_t *event) {

dns_requestevent_t *reqev = NULL;

isc_result_t result;

isc_buffer_t buf;

dns_message_t *rcvmsg = NULL;

char bufstore[MSGTEXT];

UNUSED (task);

ddebug ("updated_completed()");

REQUIRE(event->ev_type == DNS_EVENT_REQUESTDONE);

reqev = (dns_requestevent_t *)event;

if (reqev->result != ISC_R_SUCCESS) {

printf ("; Communication with server failed: %d-%s\n",

reqev->result, isc_result_totext(reqev->result));

goto done;

}

result = dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE, &rcvmsg);

check_result(result, "dns_message_create");

result = dns_request_getresponse(reqev->request, rcvmsg, ISC_TRUE);

check_result(result, "dns_request_getresponse");

if (debugging) {

isc_buffer_init(&buf, bufstore, MSGTEXT);

result = dns_message_totext(rcvmsg, 0, &buf);

check_result(result, "dns_message_totext");

printf ("\nReply from update query:\n%.*s\n",

(int)isc_buffer_usedlength(&buf),

(char*)isc_buffer_base(&buf));

}

dns_message_destroy(&rcvmsg);

done:

dns_request_destroy(&reqev->request);

isc_event_free(&event);

isc_mutex_lock(&lock);

busy = ISC_FALSE;

isc_condition_signal(&cond);

isc_mutex_unlock(&lock);

}

static void

send_update() {

isc_result_t result;

isc_sockaddr_t sockaddr;

dns_request_t *request = NULL;

char servername[MXNAME];

isc_buffer_t buf;

dns_name_t *name = NULL;

dns_rdataset_t *rdataset = NULL;

ddebug ("send_update()");

result = dns_message_gettempname(updatemsg, &name);

check_result(result, "dns_message_gettempname");

dns_name_init(name, NULL);

dns_name_clone(&actualzone, name);

result = dns_message_gettemprdataset(updatemsg, &rdataset);

check_result(result, "dns_message_gettemprdataset");

dns_rdataset_makequestion(rdataset, dns_rdataclass_in,

dns_rdatatype_soa);

ISC_LIST_INIT(name->list);

ISC_LIST_APPEND(name->list, rdataset, link);

dns_message_addname(updatemsg, name, DNS_SECTION_ZONE);

isc_buffer_init(&buf, servername, MXNAME);

result = dns_name_totext(&master, ISC_TRUE, &buf);

check_result(result, "dns_name_totext");

servername[isc_buffer_usedlength(&buf)] = 0;

get_address(servername, 53, &sockaddr);

result = dns_request_create(requestmgr, updatemsg, &sockaddr,

0, key,

FIND_TIMEOUT, global_task,

update_completed, NULL, &request);

check_result(result, "dns_request_create");

}

static void

find_completed(isc_task_t *task, isc_event_t *event) {

dns_requestevent_t *reqev = NULL;

isc_sockaddr_t sockaddr;

dns_request_t *request = NULL;

isc_result_t result;

dns_message_t *rcvmsg = NULL;

dns_section_t section;

dns_name_t *name = NULL;

dns_rdataset_t *rdataset = NULL;

dns_rdata_soa_t soa;

dns_rdata_t rdata;

isc_buffer_t buf;

char bufstore[MSGTEXT];

UNUSED(task);

ddebug ("find_completed()");

REQUIRE(event->ev_type == DNS_EVENT_REQUESTDONE);

reqev = (dns_requestevent_t *)event;

if (reqev->result != ISC_R_SUCCESS) {

printf ("; Communication with %s failed: %d-%s\n",

nameservername[ns_inuse], reqev->result,

isc_result_totext(reqev->result));

ns_inuse++;

if (ns_inuse >= nameservers) {

fatal ("Couldn't talk to any default nameserver.");

}

get_address(nameservername[ns_inuse], 53, &sockaddr);

ddebug("Destroying %lx[%lx]", &reqev->request,

reqev->request);

dns_request_destroy(&reqev->request);

isc_event_free(&event);

result = dns_request_create(requestmgr, findmsg, &sockaddr,

0, NULL,

FIND_TIMEOUT, global_task,

find_completed, NULL, &request);

check_result(result, "dns_result_create");

return;

}

ddebug ("About to create rcvmsg");

result = dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE, &rcvmsg);

check_result(result, "dns_message_create");

result = dns_request_getresponse(reqev->request, rcvmsg, ISC_TRUE);

check_result(result, "dns_request_getresponse");

section = DNS_SECTION_ANSWER;

if (debugging) {

isc_buffer_init(&buf, bufstore, MSGTEXT);

result = dns_message_totext(rcvmsg, 0, &buf);

check_result(result, "dns_message_totext");

printf ("Reply from SOA query:\n%.*s\n",

(int)isc_buffer_usedlength(&buf),

(char*)isc_buffer_base(&buf));

}

/* XXXMWS Really shouldn't use firstname here */

section = DNS_SECTION_ANSWER;

result = dns_message_firstname(rcvmsg, section);

if (result != ISC_R_SUCCESS) {

section = DNS_SECTION_AUTHORITY;

result = dns_message_firstname(rcvmsg, section);

check_result(result, "dns_message_firstname");

}

dns_message_currentname(rcvmsg, section, &name);

dns_name_init(&actualzone, NULL);

result = dns_name_dup(name, mctx, &actualzone);

/* Name is just a reference, so this is safe. */

name = NULL;

if (debugging) {

isc_buffer_clear(&buf);

result = dns_name_totext(&actualzone, ISC_FALSE, &buf);

check_result(result, "dns_name_totext");

printf ("Found zone name: %.*s\n",

(int)isc_buffer_usedlength(&buf),

(char*)isc_buffer_base(&buf));

}

ddebug("Finding name");

result = dns_message_findname(rcvmsg, section, &actualzone,

dns_rdatatype_soa, 0,

&name, &rdataset);

check_result(result, "Couldn't find SOA in reply");

result = dns_rdataset_first(rdataset);

check_result(result, "dns_rdataset_first");

dns_rdataset_current(rdataset, &rdata);

ddebug("tostruct");

result = dns_rdata_tostruct(&rdata, &soa, mctx);

check_result(result, "dns_rdata_tostruct");

dns_name_init(&master, NULL);

ddebug("Duping master");

result = dns_name_dup(&soa.origin, mctx, &master);

check_result(result, "dns_name_dup");

if (debugging) {

isc_buffer_clear(&buf);

result = dns_name_totext(&master, ISC_FALSE, &buf);

check_result(result, "dns_name_totext");

printf ("The master is: %.*s\n",

(int)isc_buffer_usedlength(&buf),

(char*)isc_buffer_base(&buf));

}

dns_rdata_freestruct(&soa);

dns_message_destroy(&rcvmsg);

dns_request_destroy(&reqev->request);

isc_event_free(&event);

ddebug ("Out of find_completed");

send_update();

}

static void

start_update() {

isc_result_t result;

dns_rdataset_t *rdataset = NULL;

dns_name_t *name = NULL;

isc_sockaddr_t sockaddr;

dns_request_t *request = NULL;

ddebug ("start_update()");

result = dns_message_create(mctx, DNS_MESSAGE_INTENTRENDER,

&findmsg);

check_result(result, "dns_message_create");

findmsg->flags |= DNS_MESSAGEFLAG_RD;

result = dns_message_gettempname(findmsg, &name);

check_result(result, "dns_message_gettempname");

result = dns_message_gettemprdataset(findmsg, &rdataset);

check_result(result, "dns_message_gettemprdataset");

dns_rdataset_makequestion(rdataset, dns_rdataclass_in,

dns_rdatatype_soa);

dns_name_init(name, NULL);

if (!valid_zonename) {

fatal ("don't have a valid zone yet.");

}

dns_name_clone(&zonename, name);

ISC_LIST_INIT(name->list);

ISC_LIST_APPEND(name->list, rdataset, link);

dns_message_addname(findmsg, name, DNS_SECTION_QUESTION);

ns_inuse = 0;

get_address(nameservername[0], 53, &sockaddr);

result = dns_request_create(requestmgr, findmsg, &sockaddr,

0, NULL,

FIND_TIMEOUT, global_task,

find_completed, NULL, &request);

check_result(result, "dns_request_create");

}

static void

free_lists() {

ddebug ("free_lists()");

if (key != NULL) {

ddebug("Freeing key");

dns_tsigkey_setdeleted(key);

dns_tsigkey_detach(&key);

}

if (keynamebuf != NULL) {

ddebug("Freeing keynamebuf");

isc_buffer_free(&keynamebuf);

}

if (keyring != NULL) {

debug ("Freeing keyring %lx", keyring);

dns_tsigkeyring_destroy(&keyring);

}

if (updatemsg != NULL)

dns_message_destroy(&updatemsg);

if (findmsg != NULL)

dns_message_destroy(&findmsg);

if (VALID_NAME(&actualzone)) {

ddebug("Freeing actualzone");

dns_name_free(&actualzone, mctx);

}

if (VALID_NAME(&zonename)) {

ddebug("Freeing zonename");

dns_name_free(&zonename, mctx);

}

if (is_dst_up) {

debug ("Destroy DST lib");

dst_lib_destroy();

is_dst_up = ISC_FALSE;

}

if (entp != NULL) {

debug ("Detach from entropy");

isc_entropy_detach(&entp);

}

ddebug("Shutting down request manager");

dns_requestmgr_shutdown(requestmgr);

dns_requestmgr_detach(&requestmgr);

ddebug("Freeing the dispatcher");

dns_dispatch_detach(&dispatchv4);

ddebug("Shutting down dispatch manager");

dns_dispatchmgr_destroy(&dispatchmgr);

ddebug("Ending task");

isc_task_detach(&global_task);

ddebug("Shutting down task manager");

isc_taskmgr_destroy(&taskmgr);

ddebug("Shutting down socket manager");

isc_socketmgr_destroy(&socketmgr);

ddebug("Shutting down timer manager");

isc_timermgr_destroy(&timermgr);

ddebug("Destroying memory context");

if (isc_mem_debugging)

isc_mem_stats(mctx, stderr);

isc_mem_destroy(&mctx);

exit(0);

}

main(int argc, char **argv) {

isc_result_t result;

parse_args(argc, argv);

setup_system();

result = isc_mutex_init(&lock);

check_result(result, "isc_mutex_init");

result = isc_condition_init(&cond);

check_result(result, "isc_condition_init");

result = isc_mutex_trylock(&lock);

check_result(result, "isc_mutex_trylock");

while (ISC_TRUE) {

reset_system();

if (!user_interaction())

break;

busy = ISC_TRUE;

start_update();

while (busy) {

result = isc_condition_wait(&cond, &lock);

check_result(result, "isc_condition_wait");

}

}

puts ("");

ddebug ("Fell through app_run");

isc_mutex_destroy(&lock);

isc_condition_destroy(&cond);

free_lists(0);

return (0);

}