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#include <stdio.h>
#include <unistd.h>
#include "strerr.h"
#include "error.h"
#include "cdb.h"
#include "cdb_make.h"
#include "open.h"
#include "buffer.h"
#include "stralloc.h"
#include "str.h"
#include "byte.h"
#include "dns.h"
#include "ip4.h"
#include "case.h"
#include "seek.h"
#include "tai.h"
#include "env.h"
#include "scan.h"
#define USAGE " add|remove fqdn ..."
#define FATAL "tinydyndns-data: fatal: "
#define WARNING "tinydyndns-data: warning: "
#define INFO "tinydyndns-data: info: "
char *progname;
void usage () { strerr_die4x(1, "usage: ", progname, USAGE, "\n"); }
void die_nomem() { strerr_die2x(111, FATAL, "out of memory."); }
void fatal(const char *m1, const char *m2) {
strerr_die4sys(111, FATAL, m1, m2, ": ");
}
void warn(const char *m1, const char *m2) {
strerr_warn3(WARNING, m1, m2, 0);
}
void info(const char *m1, const char *m2) {
buffer_puts(buffer_1, INFO);
buffer_puts(buffer_1, m1);
buffer_puts(buffer_1, m2);
buffer_putsflush(buffer_1, "\n");
}
unsigned int add =0;
unsigned int rem =0;
unsigned long ttl;
unsigned long ttd;
const char *ip;
const char *loc;
int rc =0;
int fdcdb;
int fdtmp;
stralloc sa ={0};
static char *host;
struct cdb_make c;
struct cdb cdb;
char **fqdn;
uint32 pos =0;
void get(buffer *b, char *buf, unsigned int l) {
int r;
while (l > 0) {
r =buffer_get(b, buf, l);
if (r == -1) fatal("unable to read data.cdb", 0);
if (r == 0)
strerr_die2x(111, FATAL, "unable to read data.cdb: truncated file");
buf +=r;
l -=r;
}
}
int main(int argc, char ** argv) {
buffer bcdb;
char bcdbspace[4096];
char buf[8];
char ipbuf[4];
uint32 eod;
uint32 klen;
uint32 dlen;
stralloc key ={0};
char *s;
struct tai tt, plus;
progname =*argv++;
if (! *argv) usage();
switch (**argv) {
case 'a': /* add */
add =1;
break;
case 'r': /* remove */
rem =1;
break;
default:
usage();
}
if (! *++argv) usage();
if ((s =env_get("TTL"))) scan_ulong(s, &ttl);
if ((s =env_get("TTD"))) scan_ulong(s, &ttd);
if (! (ip =env_get("IP"))) ip ="127.14.14.14";
if ((loc =env_get("LOC"))) if (! loc[0] || ! loc[1]) loc =0;
/* open data.cdb */
if ((fdcdb =open_read("data.cdb")) == -1)
fatal("unable to open data.cdb", 0);
buffer_init(&bcdb, buffer_unixread, fdcdb, bcdbspace, sizeof bcdbspace);
/* lock data.cdb */
/* open data.tmp */
if ((fdtmp =open_trunc("data.tmp")) == -1)
fatal("unable to open data.tmp", 0);
if (cdb_make_start(&c, fdtmp) == -1)
fatal("unable to create ok.cdb.tmp", 0);
/* size of database */
get(&bcdb, buf, 4);
pos +=4;
uint32_unpack(buf, &eod);
while (pos < 2048) {
get(&bcdb, buf, 4);
pos +=4;
}
while (pos < eod) {
get(&bcdb, buf, 4);
pos +=4;
uint32_unpack(buf, &klen);
get(&bcdb, buf, 4);
pos +=4;
uint32_unpack(buf, &dlen);
if (! stralloc_ready(&sa, klen +dlen)) die_nomem();
get(&bcdb, sa.s, klen +dlen);
pos +=klen +dlen;
if (rem) {
int skip =0;
for (fqdn =argv; *fqdn; ++fqdn) {
if (! dns_domain_fromdot(&host, *fqdn, str_len(*fqdn))) die_nomem();
case_lowerb(host, dns_domain_length(host));
if (byte_equal(host, dns_domain_length(host), sa.s)) {
info("remove: ", *fqdn);
skip =1;
rc--;
break;
}
}
if (skip) continue;
}
if (cdb_make_add(&c, sa.s, klen, sa.s +klen, dlen) == -1)
fatal("unable to write data.tmp", 0);
}
if (add) {
seek_begin(fdcdb);
cdb_init(&cdb, fdcdb);
if (! ip4_scan(ip, ipbuf))
strerr_die3x(100, FATAL, "unable to scan IP address: ", ip);
for (fqdn =argv; *fqdn; ++fqdn) {
if (! dns_domain_fromdot(&host, *fqdn, str_len(*fqdn))) die_nomem();
case_lowerb(host, dns_domain_length(host));
if (cdb_find(&cdb, host, dns_domain_length(host)) == 1) {
warn(*fqdn, ": already in cdb.");
rc++;
continue;
}
if (! stralloc_copyb(&sa, DNS_T_A, 2)) die_nomem();
if (loc) {
if (! stralloc_append(&sa, ">")) die_nomem();
if (! stralloc_catb(&sa, loc, 2)) die_nomem();
}
else
if (! stralloc_append(&sa, "=")) die_nomem();
if (! ttd && ! ttl) ttl =5;
uint32_pack_big(buf, ttl);
if (! stralloc_catb(&sa, buf, 4)) die_nomem(); /* ttl */
if (ttd) {
tai_now(&tt);
tai_uint(&plus, ttd);
tai_add(&tt, &tt, &plus);
tai_pack(buf, &tt);
if (! stralloc_catb(&sa, buf, 8)) die_nomem();
}
else
if (! stralloc_catb(&sa, "\0\0\0\0\0\0\0\0", 8)) die_nomem(); /* ttd */
if (! stralloc_catb(&sa, ipbuf, 4)) die_nomem();
if (! stralloc_copyb(&key, host, dns_domain_length(host))) die_nomem();
if (cdb_make_add(&c, key.s, key.len, sa.s, sa.len) == -1)
fatal("unable to write data.tmp", 0);
info("add: ", *fqdn);
}
cdb_free(&cdb);
}
close(fdcdb);
if (cdb_make_finish(&c) == -1) fatal("unable to write data.tmp", 0);
if (fsync(fdtmp) == -1) fatal("unable to write data.cdb.tmp", 0);
close(fdtmp);
if (rename("data.tmp","data.cdb") == -1)
fatal("unable to move data.tmp to data.cdb", 0);
if (rem)
for (fqdn =argv; *fqdn; ++fqdn)
rc++;
/* info("done", ""); */
if (rc > 100) rc =100;
_exit(rc);
}
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